阅读说明：本技术 一种适用于高速刺绣的刺绣机机头 (Embroidery machine head suitable for high-speed embroidery ) 是由 陈天池 张汉苗 郑邓飞 楼凯 于 2020-12-25 设计创作，主要内容包括：一种适用于高速刺绣的刺绣机机头,包括机壳和针杆架,所述针杆架滑动连接在所述机壳上而可水平滑动,所述针杆架上设有挑线杆、针杆、压脚轴和压脚,所述机壳上设有主轴、用于带动所述针杆的针杆驱动机构、用于带动所述压脚轴的压脚驱动机构和用于带动所述挑线杆的挑线驱动机构,所述机壳上还设有离合机构、离合驱动机构、输入传动轴和输出传动轴。本发明基于传统的主轴带动机头的架构来进行较全面完善的改良适配,使得各部件有机地组成一个整体,在通用性和稳定性上均表现优良,满足多种刺绣功能需要,刺绣品质较好,值得在本领域推广使用。(The machine head of the embroidery machine suitable for high-speed embroidery comprises a machine shell and a needle bar frame, wherein the needle bar frame is connected to the machine shell in a sliding mode and can slide horizontally, a take-up lever, a needle bar, a presser foot shaft and a presser foot are arranged on the needle bar frame, a main shaft, a needle bar driving mechanism used for driving the needle bar, a presser foot driving mechanism used for driving the presser foot shaft and a take-up driving mechanism used for driving the take-up lever are arranged on the machine shell, and a clutch mechanism, a clutch driving mechanism, an input transmission shaft and an output transmission shaft are further arranged on the machine shell. The invention carries out comprehensive and perfect improved adaptation based on the traditional framework of the machine head driven by the main shaft, so that all parts organically form a whole, the universality and the stability are excellent, the requirements of various embroidery functions are met, the embroidery quality is good, and the embroidery machine is worthy of being popularized and used in the field.)

1. The embroidery machine head suitable for high-speed embroidery comprises a machine shell (1) and a needle bar frame (2), wherein the needle bar frame (2) is connected to the machine shell (1) in a sliding mode and can slide horizontally, a thread take-up lever (21), a needle bar (22), a presser foot shaft (23) and a presser foot (24) are arranged on the needle bar frame (2), a main shaft (11), a needle bar driving mechanism used for driving the needle bar (22), a presser foot driving mechanism used for driving the presser foot shaft (23) and a thread take-up driving mechanism used for driving the thread take-up lever (21) are arranged on the machine shell (1), and the machine head is characterized in that: the shell (1) is also provided with a clutch mechanism, a clutch driving mechanism, an input transmission shaft (12) and an output transmission shaft (13), a transmission bearing seat (14) is arranged on the side wall of the machine shell (1), the input transmission shaft (12) and the output transmission shaft (13) penetrate through the machine shell (1) and are connected with the transmission bearing seat (14), the input transmission shaft (12) is in transmission connection with the output transmission shaft (13) through gears which are respectively and fixedly connected, the clutch mechanism is connected on the input transmission shaft (12) and is simultaneously in transmission connection with the main shaft (11), the clutch driving mechanism, the needle bar driving mechanism, the presser foot driving mechanism and the thread take-up driving mechanism are all connected with the machine shell (1), the needle bar driving mechanism is simultaneously connected with the output transmission shaft (13), and the thread take-up driving mechanism is simultaneously connected with the input transmission shaft (12).

2. An embroidery machine head suitable for high-speed embroidery according to claim 1, characterized in that: the clutch mechanism comprises a driving wheel (a 1), a clutch base (a 2) and a clutch plate (a 3), the driving wheel (a 1) is connected to the input transmission shaft (12) through a bearing, the driving wheel (a 1) is in transmission connection with a driving wheel (15) fixedly connected to the spindle (11), the clutch base (a 2) is fixedly connected to the input transmission shaft (12), the clutch plate (a 3) is in sliding connection with the clutch base (a 2), and an active butt joint part (a 31) is arranged on the clutch plate (a 3); a clutch block (a 4) is fixedly connected to the driving wheel (a 1), and a passive butt joint part (a 41) is arranged on the clutch block (a 4); the clutch driving mechanism is used for driving the clutch plate (a 3) to enable the active butt joint part (a 31) to be engaged with or separated from the passive butt joint part (a 41).

3. An embroidery machine head suitable for high-speed embroidery according to claim 2, characterized in that: the clutch base (a 2) is provided with a mounting groove (a 21) for the clutch plate (a 3) to be mounted and slide, the bottom surface of the mounting groove (a 21) is provided with a guide groove (a 22), and an elastic piece (a 5) is arranged in the guide groove (a 22); the clutch plate (a 3) is connected with a limit pin (a 6), one end of the elastic piece (a 5) is fixed or is abutted against the end part of the guide groove (a 22), and the other end of the elastic piece is pushed by the limit pin (a 6).

4. An embroidery machine head suitable for high-speed embroidery according to claim 2, characterized in that: clutch actuating mechanism includes fixing base (b 1), drive element (b 2) and movable rod (b 3), fixing base (b 1) are connected on the inner wall of casing (1), drive element (b 2) are connected on fixing base (b 1), movable rod (b 3) with drive element (b 2) are connected, movable rod (b 3) are used for pushing away clutch disc (a 3).

5. An embroidery machine head suitable for high-speed embroidery according to claim 4, characterized in that: a connecting shaft (b 11) is arranged on the fixed seat (b 1), and the movable rod (b 3) is hinged on the connecting shaft (b 11); the driving element (b 2) is provided with a connecting head (b 21), the tail end of the movable rod (b 3) is hinged with the connecting head (b 21), and the head end is used for pushing the clutch plate (a 3).

6. An embroidery machine head suitable for high-speed embroidery according to claim 1, characterized in that: the needle bar driving mechanism comprises a rotating block (c 1), a lever component (c 2), a needle bar driving guide column (c 3) and a needle bar driving seat (c 4), and the lever component (c 2) and the needle bar driving guide column (c 3) are connected with the machine shell (1); said lever assembly (c 2) having a fulcrum end, a free end and an actuating portion therebetween; the moving part of the lever assembly (c 2) is in transmission connection with the rotating block (c 1) through a first connecting rod (c 5), and the rotating block (c 1) is fixedly connected with the output transmission shaft (13) and driven by the output transmission shaft (13) to rotate; the free end of the lever component (c 2) is in transmission connection with the needle bar driving seat (c 4) through a second connecting rod (c 6); the needle bar driving seat (c 4) is connected on the needle bar driving guide post (c 3) in a sliding way and can vertically lift along the needle bar driving guide post (c 3), and the needle bar driving seat (c 4) is provided with a needle bar butting part (c 41) for horizontally sliding in a needle bar driving block (221) on the needle bar (22).

7. An embroidery machine head suitable for high-speed embroidery according to claim 6, characterized in that: the lever assembly (c 2) is bilaterally symmetrical about a central sectional plane thereof; or the whole body formed by the lever component (c 2), the first connecting rod (c 5), the second connecting rod (c 6) and the needle rod driving seat (c 4) is symmetrical left and right about the central sectional plane.

8. An embroidery machine head suitable for high-speed embroidery according to claim 6, characterized in that: the lever assembly (c 2) comprises two connecting pieces (c 21), and a first positioning connecting rod (c 22), a second positioning connecting rod (c 23) and a third positioning connecting rod (c 24) which are connected between the two connecting pieces (c 21), wherein the second positioning connecting rod (c 23) positioned in the middle serves as the moving part and is rotatably connected with the first connecting rod (c 5); the positioning connecting rod three (c 24) positioned at the front side of the positioning connecting rod two (c 23) is used as the free end part and is in rotating connection with the connecting rod two (c 6); the first positioning connecting rod (c 22) positioned at the rear side of the second positioning connecting rod (c 23) is used as the fulcrum end to be rotatably connected with a positioning connecting part in the machine shell (1) or fixedly connected with a positioning connecting part in the machine shell (1).

9. An embroidery machine head suitable for high-speed embroidery according to claim 6, characterized in that: the rotating block (c 1) comprises a counterweight part and a connecting part, and the connecting part is provided with a first connecting part (c 11) for connecting the output transmission shaft (13) and a second connecting part (c 12) for connecting the first connecting rod (c 5); the weight portion is used for keeping the mass center of the rotating block (c 1) and the needle bar driving seat (c 4) relative motionless or keeping the change range relatively minimum when the rotating block (c 1) and the needle bar driving seat (c 4) are regarded as a whole in the process of synchronously moving the rotating block (c 1) and the needle bar driving seat (c 4).

10. An embroidery machine head suitable for high-speed embroidery according to claim 1, characterized in that: the needle bar frame (2) is further provided with a presser foot self-holding mechanism, the presser foot self-holding mechanism comprises a fixed frame (d 1) and a plurality of locking assemblies (d 2) arranged on the fixed frame (d 1), the needle bar (22) and the presser foot shaft (23) vertically penetrate through the fixed frame (d 1), the locking assemblies (d 2) are provided with blocking portions (d 231) capable of moving horizontally and resetting, the presser foot shaft (23) is provided with matching portions (231), the presser foot shaft (23) is kept in a home position due to the fact that the matching portions (231) of the presser foot shaft are blocked by the blocking portions (d 231) when the presser foot shaft is not driven, and the presser foot shaft (23) can actively push the blocking portions (d 231) to lift due to the fact that the matching portions (231) of the presser foot shaft can actively push the blocking portions (d 231) when the presser.

11. An embroidery machine head suitable for high-speed embroidery according to claim 11, characterized in that: locking subassembly (d 2) includes guide arm (d 21), reset spring (d 22) and locking piece (d 23), guide arm (d 21) sliding connection or fixed connection be in on mount (d 1), locking piece (d 23) corresponding fixed connection or sliding connection be in on guide arm (d 21), reset spring (d 22) cover is established on guide arm (d 21), the tail end and mount (d 1) counterbalance of reset spring (d 22) and the head end with locking piece (d 23) counterbalance, be equipped with on locking piece (d 23) block portion (d 231), block portion (d 231) have be used for the bearing cooperation portion (231) and can be by cooperation portion (231) from the top down top open the top half and can be by cooperation portion (231) from the bottom up top open the bottom half.

12. An embroidery machine head suitable for high-speed embroidery according to claim 10 or 11, characterized in that: the fixing frame (d 1) comprises a front panel (d 11), a rear panel (d 12) and a bottom plate (d 13) connected between the front panel (d 11) and the rear panel (d 12), the front panel (d 11), the rear panel (d 12) and the needle bar frame (2) are fixedly connected, a plurality of vertical through holes (d 131) towards an opening on one side of the front panel (d 11) are arranged on the bottom plate (d 13) at intervals, and two sides of each vertical through hole (d 131) are provided with locking assemblies (d 2) connected to the front panel (d 11) and/or the rear panel (d 12).

13. An embroidery machine head suitable for high-speed embroidery according to claim 1, characterized in that: the input transmission shaft (12) extends out of the transmission bearing seat (14) and is fixedly connected with a balance block (16), and the balance block (16) comprises a connecting part for fixedly connecting the input transmission shaft (12) and a balance weight part for weakening the shaking in the running process of the machine shell (1).

14. An embroidery machine head suitable for high-speed embroidery according to claim 1, characterized in that: the presser foot driving mechanism comprises a mounting frame (e 1), a presser foot driving motor (e 2), a driving belt wheel (e 3), a driven belt wheel (e 4), a driving belt (e 5), a presser foot driving guide post (e 6) and a presser foot driving seat (e 7), wherein the mounting frame (e 1) and the presser foot driving guide post (e 6) are fixedly connected with the machine shell (1), the presser foot driving motor (e 2) is fixedly connected with the mounting frame (e 1), the driving belt wheel (e 3) is connected with the presser foot driving motor (e 2), the driven belt wheel (e 4) is connected with the mounting frame (e 1), the driving belt wheel (e 3) is in transmission connection with the driven belt wheel (e 4) through the driving belt (e 5), the driving belt (e 5) is provided with a vertically arranged part for fixedly connecting the presser foot driving seat (e 7), and the presser foot seat (e 7) is simultaneously connected with the presser foot driving guide post (e 6) in a sliding way and can move along the presser foot driving seat (e 6) The movable guide post (e 6) is vertically lifted, and a presser foot shaft butt joint part (e 71) for a presser foot driving block (232) on the presser foot shaft (23) to horizontally slide in is arranged on the presser foot driving seat (e 7).

15. An embroidery machine head suitable for high-speed embroidery according to claim 1, characterized in that: the thread take-up driving mechanism comprises a cam seat (f 1), a thread take-up cam (f 2), a first thread take-up transmission rod (f 3), a second thread take-up transmission shaft (f 4) and a second thread take-up transmission rod (f 5), the cam seat (f 1) is fixedly connected on the input transmission shaft (12) extending out of the side wall of the machine shell (1), the thread take-up cam (f 2) is connected to the cam seat (f 1), the thread take-up transmission shaft (f 4) is rotatably connected to the side wall of the machine shell (1), one end of the take-up transmission rod I (f 3) is provided with a rolling body and extends into a track groove of the take-up cam (f 2), while the other end is fixedly connected with a shaft body of the take-up transmission shaft (f 4) positioned outside the machine shell (1), one end of the take-up transmission rod II (f 5) is fixedly connected with a shaft body of the take-up transmission shaft (f 4) positioned in the machine shell (1), and the other end of the take-up transmission rod II is provided with a take-up lever butt joint.

Technical Field

The invention relates to the technical field of embroidery machines, in particular to an embroidery machine head suitable for high-speed embroidery.

Background

The computer embroidery machine head is an important part for realizing actions of needle bar embroidery, presser foot cloth pressing, hook knife thread hooking, thread taking-up lever thread taking-up and the like, the existing embroidery machine has certain defects due to old structure and lack of innovation, the existing embroidery machine basically drives all the machine heads to operate by a main shaft, and a transmission structure in each machine head mainly adopts a groove cam and a multi-connecting rod mode, so that the structure has the problems of large main shaft load, high noise, unstable operation, incapability of singly controlling the machine heads and difficulty in realizing high-speed embroidery (generally, the rotating speed of the main shaft can be regarded as high rotating speed at 1200r/min and above), how to improve the existing machine head structure to ensure the operating precision and stability of parts in the machine head under the high-speed operation of the main shaft, and is a hot topic which is researched all the time in the industry. A multi-head computerized embroidery machine and a control system thereof, as disclosed in the patent document CN201110416866.7, comprising an embroidery machine working table, an embroidery machine upper frame, a controller and a plurality of embroidery heads mounted on the embroidery machine upper frame, wherein the embroidery machine working table is provided with a main frame and a plurality of rotary shuttles, the embroidery head comprises a head box fixed on the embroidery machine upper frame, the head box is internally supported with a plurality of upper and lower component moving shafts, a thread take-up lever is mounted on the upper portion of the head box, a needle bar driving motor is mounted on the head box corresponding to the upper and lower component moving shafts, a thread take-up lever driving motor for driving the thread take-up lever independently is mounted on the head box corresponding to the thread take-up lever, which improves the structure of the conventional head to allow the head to operate more stably at high rotation speed, and each head can operate independently, the scheme is that a plurality of independent driving motors and corresponding assemblies are arranged in a machine head to replace the unified control of a main shaft and independently control a needle rod, a thread take-up lever and the like in the machine head, but instead, a traditional, simplified and mature control frame for driving the machine head by the main shaft is more complicated, the size and the space design of the machine head need to be changed greatly, so that the structural universality is poor, the input cost is greatly improved, and the improvement effect of the machine head on the operation is not ideal.

Disclosure of Invention

The technical purpose of the invention is to provide an embroidery machine head suitable for high-speed embroidery, which improves a plurality of mechanisms based on the traditional framework that a main shaft drives the machine head, ensures the universality and the stability, can stably and efficiently realize high-speed embroidery and can realize synchronous or asynchronous control of each machine head.

The specific technical scheme of the invention is as follows: an embroidery machine head suitable for high-speed embroidery comprises a machine shell and a needle bar frame, wherein the needle bar frame is connected to the machine shell in a sliding mode and can slide horizontally, a take-up lever, a needle bar, a presser foot shaft and a presser foot are arranged on the needle bar frame, a main shaft, a needle bar driving mechanism used for driving the needle bar, a presser foot driving mechanism used for driving the presser foot shaft and a take-up driving mechanism used for driving the take-up lever are arranged on the machine shell, a clutch mechanism, a clutch driving mechanism, an input transmission shaft and an output transmission shaft are further arranged on the machine shell, transmission bearing seats are arranged on the side wall of the machine shell, the input transmission shaft and the output transmission shaft penetrate through the machine shell and are connected with the transmission bearing seats, the input transmission shaft and the output transmission shaft are in transmission connection through respective gears fixedly connected with the input transmission shaft, the clutch mechanism is connected to the input, the clutch driving mechanism, the needle rod driving mechanism, the presser foot driving mechanism and the take-up driving mechanism are all connected with the machine shell, the needle rod driving mechanism is connected with the output transmission shaft at the same time, and the take-up driving mechanism is connected with the input transmission shaft at the same time.

Preferably, the clutch mechanism comprises a transmission wheel, a clutch base and a clutch plate, the transmission wheel is connected to the input transmission shaft through a bearing, the transmission wheel is in transmission connection with a driving wheel fixedly connected to the spindle, the clutch base is fixedly connected to the input transmission shaft, the clutch plate is connected to the clutch base in a sliding manner, and the clutch plate is provided with an active butt joint part; a clutch block is fixedly connected to the driving wheel, and a passive butt joint part is arranged on the clutch block; the clutch driving mechanism is used for driving the clutch plate to enable the active butt joint part and the passive butt joint part to be jointed or separated.

Preferably, the clutch base is provided with a mounting groove for the clutch plate to be mounted and slid, the bottom surface of the mounting groove is provided with a guide groove, and an elastic part is arranged in the guide groove; the clutch plate is connected with a limit pin, one end of the elastic piece is fixed or is propped against the end part of the guide groove, and the other end of the elastic piece is used for pushing the limit pin.

Preferably, the clutch driving mechanism comprises a fixed seat, a driving element and a movable rod, the fixed seat is connected to the inner wall of the casing, the driving element is connected to the fixed seat, the movable rod is connected with the driving element, and the movable rod is used for pushing the clutch plate.

Preferably, the fixed seat is provided with a connecting shaft, and the movable rod is hinged on the connecting shaft; the driving element is provided with a connector, the tail end of the movable rod is hinged with the connector, and the head end of the movable rod is used for pushing the clutch plate.

Preferably, the needle rod driving mechanism comprises a rotating block, a lever assembly, a needle rod driving guide post and a needle rod driving seat, and the lever assembly and the needle rod driving guide post are both connected with the machine shell; the lever assembly has a fulcrum end, a free end and an actuating portion therebetween; the movable part of the lever assembly is in transmission connection with the rotating block through a connecting rod, and the rotating block is fixedly connected with the output transmission shaft and driven by the output transmission shaft to rotate; the free end part of the lever component is in transmission connection with the needle rod driving seat through a connecting rod II; the needle bar driving seat is connected to the needle bar driving guide post in a sliding mode and can vertically lift along the needle bar driving guide post, and the needle bar driving seat is provided with a needle bar driving butt joint portion for the needle bar on the needle bar to drive the block to horizontally slide in.

Preferably, the lever assembly is bilaterally symmetrical about a central sectional plane thereof; or the whole body formed by the lever component, the first connecting rod, the second connecting rod and the needle rod driving seat is symmetrical left and right about the central sectional plane.

Preferably, the lever assembly comprises two connecting pieces, a first positioning connecting rod, a second positioning connecting rod and a third positioning connecting rod which are connected between the two connecting pieces, and the second positioning connecting rod positioned in the middle is used as the moving part and is rotationally connected with the connecting rod; the positioning connecting rod III positioned on the front side of the positioning connecting rod II is used as the free end part and is rotationally connected with the connecting rod II; the first positioning connecting rod positioned at the rear side of the second positioning connecting rod is used as the end part of the fulcrum and is rotatably connected with the positioning connecting part in the machine shell, or is rotatably connected with the positioning connecting block fixedly connected in the machine shell.

Preferably, the rotating block comprises a counterweight part and a connecting part, and the connecting part is provided with a first connecting part for connecting the output transmission shaft and a second connecting part for connecting the first connecting rod; the counterweight part is used for keeping the corresponding mass center of the rotating block and the needle rod driving seat relatively motionless or minimizing the variation range of the rotating block and the needle rod driving seat when the rotating block and the needle rod driving seat are considered as a whole in the process of synchronous movement of the rotating block and the needle rod driving seat.

Preferably, the needle bar frame is further provided with a presser foot self-holding mechanism, the presser foot self-holding mechanism comprises a fixed frame and a plurality of locking assemblies arranged on the fixed frame, the needle bar and the presser foot shaft vertically penetrate through the fixed frame, each locking assembly is provided with a blocking part which can horizontally move and reset, the presser foot shaft is provided with a matching part, the presser foot shaft is kept in the original position due to the fact that the matching part of the presser foot shaft is blocked by the blocking part when the presser foot shaft is not driven, and the presser foot shaft can be actively lifted up and down due to the fact that the matching part of the presser foot shaft can be actively pushed out of the blocking part when the presser foot.

As preferred, the locking subassembly includes guide arm, reset spring and locking piece, guide arm sliding connection or fixed connection are in on the mount, locking piece corresponding ground fixed connection or sliding connection be in on the guide arm, the reset spring cover is established on the guide arm, reset spring's tail end and mount counterbalance and the head end with the locking piece offsets, be equipped with on the locking piece the blocking part, the blocking part has and is used for the bearing the cooperation portion can by the cooperation portion from last half that down backs up and can be by the latter half that the cooperation portion was from up backed up down.

Preferably, the fixing frame comprises a front panel, a rear panel and a bottom plate connected between the front panel and the rear panel, the front panel and the rear panel are fixedly connected with the needle bar frame respectively, a plurality of vertical through holes towards one side opening of the front panel are arranged on the bottom plate at intervals, and locking assemblies connected to the front panel and/or the rear panel are arranged on two sides of each vertical through hole.

Preferably, the input transmission shaft extends out of the transmission bearing seat and is fixedly connected with a balance block, and the balance block comprises a connecting part for fixedly connecting the input transmission shaft and a balance weight part for weakening the shaking of the machine shell in the operation process.

Preferably, the presser foot driving mechanism comprises a mounting frame, a presser foot driving motor, a driving belt wheel, a driven belt wheel, a driving belt, a presser foot driving guide post and a presser foot driving seat, the mounting frame and the presser foot driving guide post are both fixedly connected with the machine shell, the presser foot driving motor is fixedly connected on the mounting frame, the driving belt wheel is connected with the presser foot driving motor, the driven belt wheel is connected on the mounting frame, the driving belt wheel is in transmission connection with the driven belt wheel through the driving belt, the driving belt is provided with a vertically arranged part for fixedly connecting the presser foot driving seat, the presser foot driving seat is simultaneously connected on the presser foot driving guide post in a sliding way and can vertically lift along the presser foot driving guide post, the presser foot driving seat is provided with a presser foot driving butt joint part for the horizontal sliding of the presser foot driving block on the presser foot shaft.

Preferably, the thread take-up driving mechanism comprises a cam seat, a thread take-up cam, a thread take-up transmission rod I, a thread take-up transmission shaft and a thread take-up transmission rod II, the cam seat is fixedly connected to the input transmission shaft extending out of the side wall of the machine shell, the thread take-up cam is connected to the cam seat, the thread take-up transmission shaft is rotatably connected to the side wall of the machine shell, one end of the thread take-up transmission rod is provided with a rolling body and extends into a track groove of the thread take-up cam, the other end of the thread take-up transmission rod is fixedly connected with a shaft body of the thread take-up transmission shaft located outside the machine shell, one end of the thread take-up transmission rod II is fixedly connected with the shaft body of the thread.

The technical advantages of the invention are mainly as follows:

1. the input transmission shaft and the output transmission shaft are added as a transfer part of the power transmission of the main shaft, whether the input transmission shaft and the output transmission shaft are linked with the main shaft or not is controlled by a clutch mechanism, and correspondingly, the input transmission shaft and the output transmission shaft are respectively connected with a thread take-up driving mechanism and a needle rod driving mechanism, so that the machine heads can independently operate to realize the operations of embroidery supplementation, embroidery stopping and the like;

2. the clutch mechanism and the clutch driving mechanism have compact structures, and are convenient, stable and easy to use in the shell;

3. because of the existence of the input transmission shaft and the output transmission shaft, the load borne by the main shaft in the traditional structure can be shared and reduced, the operation stability is improved, and the service life is prolonged;

4. the input transmission shaft and the output transmission shaft are transmitted through gears, so that the transmission precision and the transmission efficiency are high, and the noise is low;

5. the needle bar driving mechanism replaces a traditional transmission structure of a cam and a connecting rod with a rotating block and a lever assembly, has short transmission stroke, symmetrical structure, balanced transmission stress, high structural strength, good operation stability and flexible selection of installation space;

6. when the thread take-up driving mechanism is connected with the input transmission shaft, the thread take-up driving mechanism can be externally arranged outside the side wall of the machine shell, so that an installation space is reserved for other components in the machine shell, the thread take-up driving mechanism is convenient to maintain and replace, and the manual maintenance cost is greatly reduced;

7. the presser foot driving mechanism independently drives the presser foot, so that the connection and the working height of the presser foot can be conveniently adjusted, and various embroidery requirements are met;

8. the presser foot self-holding mechanism enables the presser foot to be kept in the original position in a non-working state, and can be driven by the presser foot driving mechanism to overcome resistance to lift in a working state, the presser feet in the two states are not affected mutually, and the spring assembly for resetting of the presser foot part in the traditional structure is replaced by the presser foot self-holding mechanism, so that the unstable operation of the presser foot and the increase of the operation load of the driving structure caused by the traditional spring assembly are avoided, and the embroidery quality is improved;

9. the rotating block in the needle bar driving mechanism and the balance block connected with the input transmission shaft can help to weaken the shake of the whole machine head in operation and improve the stability of the machine head in operation.

In conclusion, the invention carries out comprehensive and perfect improved adaptation based on the traditional framework of the machine head driven by the main shaft, so that all parts are organically integrated into a whole, the universality and the stability are excellent, the requirements of various embroidery functions are met, the embroidery quality is good, and the invention is worthy of popularization and use in the field.

Drawings

FIG. 1 is a schematic overall structure diagram of an embodiment of the present invention;

FIG. 2 is a schematic structural view of a needle bar holder according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a housing according to an embodiment of the invention;

FIG. 4 is a schematic structural diagram of a housing according to an embodiment of the invention;

FIG. 5 is a schematic structural diagram of an input transmission shaft, an output transmission shaft and a transmission bearing seat according to an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a clutch mechanism and a clutch driving mechanism according to an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of a clutch mechanism according to an embodiment of the present invention;

FIG. 8 is a schematic structural diagram of a driving wheel according to an embodiment of the present invention;

FIG. 9 is a schematic structural diagram of a clutch driving mechanism according to an embodiment of the present invention;

fig. 10 is a schematic structural view of a needle bar drive mechanism according to an embodiment of the present invention;

fig. 11 is a schematic structural view of a needle bar drive mechanism according to an embodiment of the present invention;

FIG. 12 is a schematic structural view of a lever assembly according to an embodiment of the present invention;

FIG. 13 is a schematic structural view of a needle bar driving seat according to an embodiment of the present invention;

fig. 14 is a schematic structural view of a presser foot self-holding mechanism according to an embodiment of the present invention;

FIG. 15 is a schematic structural diagram of a fixing frame according to an embodiment of the present invention;

FIG. 16 is a schematic structural diagram of a blocking portion and a mating portion according to an embodiment of the present invention;

fig. 17 is a schematic side view of the locking assembly and the presser foot driving block according to the embodiment of the present invention;

fig. 18 is a schematic top view of the locking assembly and the presser foot drive block according to the embodiment of the present invention; (ii) a

Fig. 19 is a schematic structural view of a presser foot drive mechanism according to an embodiment of the present invention;

FIG. 20 is a schematic structural view of a thread take-up mechanism according to an embodiment of the present invention;

the names of the parts corresponding to the numbers in the figure are respectively: 1-a machine shell, 11-a main shaft, 12-an input transmission shaft, 13-an output transmission shaft, 14-a transmission bearing seat, 15-a driving wheel, 16-a balance block, 17-a thread hooking device, 2-a needle bar frame, 21-a thread take-up lever, 22-a needle bar, 221-a needle bar driving block, 23-a presser foot shaft, 231-a presser foot driving block, 232-a matching part and 24-a presser foot;

a 1-a driving wheel, a 2-a clutch base, a 21-a mounting groove, a 22-a guide groove, a 23-a positioning groove, a 3-a clutch plate, a 31-an active butt joint part, a 32-an open groove, a 4-a clutch block, a 41-a passive butt joint part, a 5-an elastic part, a 6-a limit pin, a 7-a pressing plate and a 8-an assembly positioning pin;

b 1-a fixed seat, b 11-a connecting shaft, b 2-a driving element, b 21-a connector, b 3-a movable rod and b 31-a pushing column;

c 1-rotating block, c 11-first connecting part, c 12-second connecting part, c 2-lever component, c 21-connecting piece, c 22-first positioning connecting rod, c 23-second positioning connecting rod, c 24-third positioning connecting rod, c 25-reinforcing supporting rod, c 3-needle rod driving guide column, c 4-needle rod driving seat, c 41-needle rod driving butt joint part, c 42-guide sleeve hole, c 421-outer wall opening, c 43-connecting rod connecting part, c 44-lubricating cavity, c 5-first connecting rod and c 6-second connecting rod;

d 1-a fixed frame, d 11-a front panel, d 111-a horizontal via hole, d 12-a rear panel, d 13-a bottom plate, d 131-a vertical via hole, d 2-a locking assembly, d 21-a guide rod, d 22-a return spring, d 23-a locking block and d 231-a blocking part;

e 1-mounting bracket, e 2-presser foot drive motor, e 3-drive pulley, e 4-driven pulley, e 5-drive belt, e 6-presser foot drive guide post, e 7-presser foot drive seat, e 71-presser foot drive butt joint part;

f 1-cam seat, f 2-thread take-up cam, f 3-thread take-up transmission rod I, f 4-thread take-up transmission shaft and f 5-thread take-up transmission rod II.

Detailed Description

The invention will be further illustrated by means of specific embodiments in the following description with reference to the accompanying drawings:

referring to fig. 1 to 5, an embodiment of a head of an embroidery machine suitable for high-speed embroidery includes a machine case 1 and a needle bar frame 2, wherein an upper guide rail and a lower guide rail with a guide rail bead group are respectively arranged on the machine case 1, the needle bar frame 2 is connected to the machine case 1 through the upper guide rail and the lower guide rail in a sliding manner and can horizontally slide, a thread take-up lever 21, a needle bar 22, a presser foot shaft 23 and a presser foot 24 are arranged on the needle bar frame 2, and a main shaft 11, a needle bar driving mechanism for driving the needle bar 22, a presser foot driving mechanism for driving the presser foot shaft 23, a thread take-up driving mechanism for driving the thread take-up lever 21 and a thread hooking device 17 for hooking. The machine shell 1 is further provided with a clutch mechanism, a clutch driving mechanism, an input transmission shaft 12 and an output transmission shaft 13, a transmission bearing seat 14 is arranged on the side wall of the machine shell 1, the input transmission shaft 12 and the output transmission shaft 13 penetrate through the machine shell 1 and are connected with the transmission bearing seat 14, the input transmission shaft 12 and the output transmission shaft 13 are in transmission connection through gears fixedly connected with the input transmission shaft 12 and the output transmission shaft 13 respectively, the clutch mechanism is connected with the input transmission shaft 12 and is simultaneously in transmission connection with the main shaft 11, the clutch driving mechanism, the needle bar driving mechanism, the presser foot driving mechanism and the thread take-up driving mechanism are all connected with the machine shell 1, the needle bar driving mechanism is simultaneously connected with. The thread hooking device 17 is arranged in a specially arranged mounting inner cavity at the bottom of the machine shell 1 in a built-in mode, is separated from a clutch mechanism, a needle bar driving mechanism and a presser foot driving mechanism in the machine shell 1 above the thread hooking device, optimizes mounting space, avoids working interference, and extends out of the mounting inner cavity for thread hooking.

Referring to fig. 5, the gears for meshing transmission provided on the input transmission shaft 12 and the output transmission shaft 13 include a metal part and a plastic part, the plastic part is injection molded outside the metal part, the plastic part is provided with a tooth space, and the metal part is fixedly connected to the shaft body. The split type design different from the traditional gear is adopted, because the traditional gear made of all-metal materials has large error due to the limitation of a processing technology, transmission gaps easily exist during gear meshing transmission, transmission is unstable, embroidery processing and quality are influenced, a plastic part is easy to process, the controllability of gap errors is good, noise during transmission is greatly reduced, cost is reduced to some extent, the metal part and a shaft are convenient and firm to form, and the plastic part and the metal part are formed in the same way, so that the gear in the scheme is completely different from and better than the design of the traditional gear, transmission precision can be obviously improved, and embroidery quality is effectively improved.

As shown in fig. 19, the presser foot driving mechanism includes an installation frame e1, a presser foot driving motor e2, a driving pulley e3, a driven pulley e4, a driving belt e5, a presser foot driving guide post e6 and a presser foot driving seat e7, the installation frame e1 and the presser foot driving guide post e6 are fixedly connected with the machine shell 1, the presser foot driving motor e2 is fixedly connected to the installation frame e1, the driving pulley e3 is connected with the presser foot driving motor e2, the driven pulley e4 is connected to the installation frame e1, the driving pulley e3 is in transmission connection with the driven pulley e4 through the driving belt e5, the driving belt e5 has a vertically arranged portion for fixedly connecting the presser foot driving seat e7, and there are many common choices as to the manner of fixedly connecting the two, in this embodiment, the presser foot driving seat e7 is clamped and fixed on the driving pulley e5 through a fixing sheet; the presser foot driving seat e7 is also slidably connected to the presser foot driving guide post e6 and vertically ascends and descends along the presser foot driving guide post e6, and the presser foot driving seat e7 is further provided with a presser foot driving butt part e71 into which the presser foot driving block 231 on the presser foot shaft 23 horizontally slides. The presser foot driving mechanism realizes independent driving of the presser foot 24, so that the working height of the presser foot 24 is adjustable, and the embroidery needs are met. In this embodiment, the presser foot actuating mechanism selects external installation in the bottom of casing 1, conveniently overhauls the maintenance, avoids producing the interference with other structures in casing 1 inside, also vacates more installation space for other structures in the casing 1.

As shown in fig. 20, the thread take-up driving mechanism includes a cam seat f1, a thread take-up cam f2, a thread take-up transmission rod f3, a thread take-up transmission shaft f4, and a thread take-up transmission rod f5, the cam seat f1 is fixedly connected to the input transmission shaft 12 extending out of the side wall of the casing 1, the thread take-up cam f2 is connected to the cam seat f1, the thread take-up transmission shaft f4 is rotatably connected to the side wall of the casing 1, one end of the thread take-up transmission rod f3 is provided with a rolling body and extends into the track groove of the thread take-up cam f2, while the other end is fixedly connected to the shaft body of the thread take-up transmission shaft f4 located outside the casing 1, one end of the thread take-up transmission rod f5 is fixedly connected to the shaft body of. In this embodiment, the take-up driving mechanism is adaptively adjusted and driven by the input transmission shaft 12, and is externally mounted on the side of the casing 1, so as to save the mounting space in the casing 1, avoid interference with other structures in the casing 1, facilitate maintenance and repair, and greatly reduce the manual replacement cost.

Referring to fig. 6 and 7, the clutch mechanism includes a driving wheel a1, a clutch base a2 and a clutch plate a3, the driving wheel a1 is connected to the input transmission shaft 12 through a bearing, so that the driving wheel a1 and the input transmission shaft 12 can rotate independently, the driving wheel a1 is connected to a driving wheel 15 fixedly connected to the main shaft 11 through a synchronous belt, and a tension wheel can be additionally disposed in the housing 1 to tension the synchronous belt, thereby ensuring stable transmission. The clutch base a2 is fixedly connected to the input drive shaft 12 in such a manner that a fastening screw hole is provided on the circumferential side surface of the clutch base a2, and a fastening screw for fastening the input drive shaft 12 is connected to the fastening screw hole. The clutch plate a3 is connected on the positive side surface of the clutch base a2 in a sliding way, and the clutch plate a3 is provided with an active butt joint part a 31; as shown in fig. 8, a clutch block a4 is fixedly connected to the back side of the driving wheel a1, the clutch block a4 and the driving wheel a1 can be integrally formed, and a passive butting portion a41 is arranged on the clutch block a 4; the clutch driving mechanism is used for driving the clutch plate a3 to enable the active butting portion a31 to be jointed with or separated from the passive butting portion a 41.

The sliding connection mode of the clutch plate a3 is that the clutch base a2 is provided with a mounting groove a21 for the clutch plate a3 to be mounted and slide, and the clutch plate a3 is driven by external force and can move in the mounting groove a21 in a reciprocating manner. The bottom surface of the mounting groove a21 is provided with a guide groove a22, an elastic piece a5 is arranged in the guide groove a22, and the elastic piece a5 is a spring; the clutch plate a3 is connected with a spacing pin a6, one end of an elastic piece a5 is abutted against the end part of the guide groove a22 (or directly and fixedly connected in the guide groove a 22) while the other end is abutted against the spacing pin a6, the spacing pin a6 is used for compressing the elastic piece a5, and the elastic piece a5 is used for resetting the clutch plate a 3. In the embodiment, the two ends of the spring are further provided with the jacking blocks, so that jacking is more stable and smooth; the guide groove a22 is provided with two upper and lower parts, correspondingly, the spring and the limit pin a6 are provided with two parts.

In addition, the clutch base a2 is also connected with a pressing sheet a7, the pressing sheet a7 limits and presses the front surface of the clutch sheet a3, the pressing sheet a7 is provided with an upper sheet and a lower sheet, namely, the pressing sheet a7 is connected to the front side surface of the clutch base a2 adjacent to the upper end and the lower end of the mounting groove a21 in the drawing, because the mounting groove a21 only limits and blocks the upper peripheral side and the lower peripheral side of the clutch sheet a3, the pressing sheet a7 can help to further stabilize the position of the clutch sheet a3, enable the clutch sheet a3 to slide smoothly and prevent the clutch sheet a 36. The side surface of the clutch base a2 is provided with a positioning slot a23, and the clutch plate a3 is connected with an assembly positioning pin a8 matched with the positioning slot a23, so that an operator can conveniently and quickly find an accurate assembly station when assembling the clutch plate a 3.

Although the mounting position of the clutch plate a3 and the clutch block a4 is theoretically free, because it is only necessary to ensure that the active abutment a31 and the passive abutment a41 are provided to be able to engage with each other, the clutch plate a3 and the clutch block a4 are close together on the input transmission shaft 12 in order to make the best use of the mounting space. In this embodiment, the clutch block a4 is sleeved outside the input transmission shaft 12, and the passive abutting portion a41 is disposed on the peripheral side surface of the clutch block a4, the clutch block a4 is generally a ring block smaller than the body of the transmission wheel a1, and may be a closed or notched ring block, which is also a closed ring block in the illustration, and a bearing is still disposed between the clutch block a4 and the input transmission shaft 12, so that a hollow portion does not exist between the clutch block a4 and the input transmission shaft 12, and the entire transmission wheel a1 is supported, and the transmission wheel a1 is not deflected by a radial force from the outside in operation; the clutch plate a3 is sleeved outside the clutch plate a4 and can move horizontally relative to the clutch plate a4, the clutch plate a3 is a regular or irregular ring plate with a hollow part and larger than the clutch plate a4, the ring plate can be closed or a ring plate with a gap, the ring plate is closed in the figure, the upper and lower peripheral side surfaces of the ring plate are flattened to be matched in the mounting groove a21 for sliding, and the active butt joint part a31 is arranged on the inner ring surface of the clutch plate a 3. In this embodiment, the active abutting portion a31 is a protruding latch, the passive abutting portion a41 is a recessed latch (of course, the active abutting portion a31 may be a recessed latch, and the passive abutting portion a41 may be a protruding latch), and the latch are engaged with or disengaged from each other, so that the clutch function is realized.

Referring to fig. 9, the clutch driving mechanism includes a fixed seat b1, a driving element b2 and a movable rod b3, the fixed seat b1 is fixedly connected to the inner wall of the casing 1, the driving element b2 is installed on the fixed seat b1, the movable rod b3 is connected to the driving element b2, and the movable rod b3 is used for pushing the clutch plate a 3. In this embodiment, the driving element b2 is a cylinder. In order to save the installation space, the fixed seat b1 is further provided with a connecting shaft b11, and the movable rod b3 is hinged on the connecting shaft b 11; the connecting shaft b11 is further provided with a reset torsion spring b12 for helping the movable rod b3 reset, two ends of the reset torsion spring b12 are provided with a hook part, the hook part at one end can be clamped and limited with the movable rod b3, the hook part at the other end can be clamped and limited with the fixed seat b1, and the schematic diagram can be clearly and intuitively seen from fig. 6 and 9; the driving element b2 has a connecting head b21, the tail end of the movable rod b3 is hinged with the connecting head b21, and the head end is used for pushing the clutch plate a3, for accurate and stable pushing, the peripheral side surface of the clutch plate a3 is further provided with an open slot a32, and the head end of the movable rod b3 is provided with a pushing column b31 which is matched and butted with the open slot a 32. In this way, the movable rod b3 is used as an intermediate transmission member, which is equivalent to a rocker, the cylinder pushes one end of the movable rod b3, the other end of the movable rod b3 pushes the clutch plate a3 in the opposite direction, and the installation position of the cylinder can be parallel to the clutch base a2 and the clutch plate a3, that is, as shown in the figure, it is not necessary to make the installation position of the cylinder directly push the clutch plate a3 towards the clutch plate a3, because the parallel installation mode of the former is compared with the direct installation mode of the latter, which is equivalent to folding in the space position, the length in installation is reduced, and the space in the machine case 1 does not reserve a longitudinal space with a long span, which is a relatively optimized assembly scheme for the originally limited space in the machine case 1. In addition, the movable lever b3 may be provided in an "S" shape so as to avoid interference with the clutch mechanism.

And the structure is also provided with an in-place detection encoder or an in-place detection sensor which is matched with the clutch driving mechanism and used for detecting whether the clutch plate a3 rotates to a preset position to be pushed by the movable rod b 3. As for the in-place detection encoder, an optional encoder such as a rotary angle encoder is selectively connected with the spindle 11, because in normal operation, the active abutting portion a31 is engaged with the passive abutting portion a41, that is, the clutch plate a3 is in transmission connection with the clutch block a4, that is, the rotation of the spindle 11 is transmitted to the clutch plate a3 through the transmission wheel a1, and when the clutch plate a3 rotates to a preset position to be pushed to be separated from the clutch block a, the spindle 11 has a corresponding position, and the position of the spindle 11 is directly detected by the rotary angle encoder; of course, the rotary angle encoder can also be optionally connected to the input drive shaft 12, since during normal operation, the input drive shaft 12 rotates synchronously with the clutch base a2, i.e., with the clutch plate a3, and therefore it is also possible to determine whether the clutch plate a3 is in place by detecting the rotational position of the input drive shaft 12. Similarly, as for the in-place detection sensor, an optional laser sensor, such as a laser sensor, may be disposed in the housing 1, and aligned with the driving wheel a1 or the clutch plate a3 itself or the clutch base a2, and correspondingly, a detection index point (such as a detection hole, a detection base, etc.) is formed on the driving wheel a1 or the clutch plate a3 or the clutch base a2, and a position corresponding to a preset position where the clutch plate a3 rotates to be pushed to separate from the clutch block a4 is found; it can also be arranged outside the casing 1, aligned with the driving wheel 15, and find the position corresponding to the preset position where the clutch plate a3 rotates to be pushed to separate from the clutch block a 4.

The specific clutch implementation mode is as follows: when the device normally operates, the driving wheel a1 is driven by the driving wheel 15, the clutch driving mechanism does not work, the movable rod b3 does not contact the clutch plate a3, the active butt joint part a31 of the clutch plate a3 is jointed with the passive butt joint part a41 of the clutch block a4, so the driving wheel a1 drives the clutch plate a3 to drive the clutch base a2 to rotate, the clutch base a2 drives the input transmission shaft 12 to rotate, the input transmission shaft 12 drives the output transmission shaft 13 through the meshed gear, and the output transmission shaft 13 drives the connected needle rod driving mechanism to drive the needle rod to move; when a needle jump is needed, or when one or some handpieces need to work alone to finish embroidery repair, the handpieces are still in a normal operation state, and the other handpieces need to stop needle setting, in the other handpieces, the driving wheel a1 is still driven by the driving wheel 15, when the clutch sheet a3 rotates to a preset position to be pushed, the spindle 11 stops rotating, the clutch sheet a3 also stops at the position, at the moment, the clutch driving mechanism starts to work, the movable rod b3 is made to push the clutch sheet a3, the clutch sheet a3 slides along the mounting groove a21, so that the active butt joint portion a31 is separated from the passive butt joint portion a41 of the clutch block a4, therefore, the clutch sheet a3 is not driven by the driving wheel a1 any more, the transmission connection is broken, the power can not be transmitted any more, the input transmission shaft 12 does not rotate, the output transmission shaft 13 does not rotate, and the connected needle bar driving mechanism is not driven, so that the needle bar 22 of the corresponding handpiece does not move.

Referring to fig. 10 and 11, the needle bar driving mechanism includes a rotation block c1, a lever assembly c2, a needle bar driving guide post c3 and a needle bar driving seat c4, and the lever assembly c2 and the needle bar driving guide post c3 are connected to the housing 1; lever assembly c2 has a fulcrum end, a free end and an actuating portion therebetween; the moving part of the lever component c2 is in transmission connection with the rotating block c1 through a connecting rod c5, and the rotating block c1 is fixedly connected with the output transmission shaft 13 and is driven to rotate by the output transmission shaft 13; the free end of the lever component c2 is in transmission connection with the needle bar driving seat c4 through a second connecting rod c 6; the needle bar drive seat c4 is slidably attached to the needle bar drive guide post c3 so as to be vertically movable along the needle bar drive guide post c3, and the needle bar drive seat c4 is provided with a needle bar drive abutment c41 for horizontally sliding in the needle bar drive block 221 on the needle bar 22.

In this embodiment, the whole of the lever assembly c2, the link one c5, the link two c6 and the needle bar driving seat c4 is a left-right symmetrical structure about a longitudinal central sectional plane thereof, and thus the design is that after the research and practice of the applicant, the traditional old link transmission structure is a completely asymmetrical structure, the driving force is continuously deflected in the transmission process rather than transmitted along the structure central line, the local force is too large, the transmission is unstable, the components are easy to damage, the final movement of the needle bar is not stable, and the penetrating force is insufficient, and the adverse effects mentioned above can be weakened or avoided by designing as many structural parts of the transmission structure as possible to be symmetrical, so that the design with high symmetry as mentioned in the foregoing embodiment is provided, in some embodiments, for other reasons, such as for facilitating the assembly and arrangement of components in other housings 1, alternatively, the lever assembly c2 may be designed to be symmetrical, which, although compromised, still provides a stable balance of drive over the traditional old link configuration, and the parts of the device will be described in greater detail below.

Referring to fig. 12, the lever assembly c2 includes two connecting pieces c21, the two connecting pieces c21 are identical and symmetrical in shape, and a first positioning connecting rod c22, a second positioning connecting rod c23 and a third positioning connecting rod c24 are sequentially disposed between the tail ends, the middle sections and the head ends of the two connecting pieces c21 (of course, more similar positioning connecting rods may be disposed as required). In the figure, the positioning connecting rod II c23 positioned in the middle is used as a movable part and is rotatably connected with the lower end of the connecting rod I c 5; the positioning connecting rod three c24 positioned at the front side of the positioning connecting rod two c23 is used as a free end part and is rotatably connected with the lower end of the connecting rod two c 6; the first positioning connecting rod c22 located at the rear side of the second positioning connecting rod c23 is used as a fulcrum end and is rotatably connected with a positioning connecting block, and the positioning connecting block is fixedly connected with the inner wall of the casing 1.

The design of two connecting pieces c21, firstly because the needs of symmetrical structure let the point of conduction atress balance on central section and improve transmission stability, secondly because the slice connection structure after improving like this, compare traditional connecting rod structure, can subtract heavy, can reduce air resistance again, the noise of moving is also relatively littleer simultaneously. In this embodiment, the connection points of the connection piece c21 corresponding to the three positioning connection rods are the head, the tail and the middle of the connection piece c21, so that the connection is more balanced and stable. A reinforcing support bar c25 is also connected between the two connecting pieces c21 and is arranged between the adjacent positioning connecting bars, so as to further ensure that the connecting piece c21 has enough strength under the high-speed operation condition. The needle bar drive guide post c3 passes through the space between the two connecting pieces c21 near the head end, so that the assembly station of the needle bar drive guide post c3 and the lever assembly c2 in the machine case 1 is optimized on the basis of making the structure of the lever assembly c2 large enough to have higher structural strength and better transmission stability, and the needle bar drive guide post c3 is arranged so that it can also present a symmetrical structure with the lever assembly c2 as a whole.

Referring to fig. 10 and 11, the rotating block c1 includes a counterweight portion and a connecting portion, in this embodiment, the rotating block c1 is designed as a special-shaped block similar to a fan, the fan body portion is a counterweight portion, the fan handle portion is a connecting portion, and the connecting portion is provided with a first connecting portion c11 for connecting the output transmission shaft 13 and a second connecting portion c12 for connecting the upper end of the first connecting rod c5, which are in the form of connecting holes. The hole of the first connecting portion c11 is in the form of a slit extending all the way out of the weight portion, and the weight portion is provided with a fastening screw hole and a fastening screw in a matching manner, and the output transmission shaft 13 is held by the first connecting portion c 11. The second connecting portion c12 and the first connecting rod c5 are rotatably connected by a conventional bearing and a connecting pin.

The counterweight part of the rotating block c1 is used for keeping the mass center of the rotating block c1 and the needle bar driving seat c4 relatively motionless or relatively minimum change range when the rotating block c1 and the needle bar driving seat c4 move synchronously, thus the rotating block c1 and the needle bar driving seat c4 can be kept in a dynamic balance state as much as possible during operation, particularly under the condition of high-speed movement, the structural jitter phenomenon during operation is reduced, the transmission is more stable, the response is more timely, and the components are less prone to damage. The corresponding operational behavior may be described by way of example, in that when the needle bar drive seat c4 is moved lowermost along the needle bar drive guide post c3, the weighted portion is rotated to a position on the side farthest from the needle bar drive seat c 4; when the needle bar drive seat c4 moves to the highest position along the needle bar drive guide post c3, the weight portion rotates to the position on the nearest side of the needle bar drive seat c 4. Of course, it is possible that the two relative rotational positions mentioned above are the same (e.g., when the needle bar drive seat c4 is moved to the lowest or highest position, the weight portion may be rotated to the mentioned position near the farthest or closest position from the needle bar drive seat c 4), the actual follow-up rotation block c1 and the needle bar drive seat c4 are considered to be integral with the predetermined variation requirements of the center of mass, and the corresponding operating performance may be determined by a plurality of preliminary tests.

The rotating block c1 is different from the cam in the traditional structure, the rotating block c1 is connected with the connecting rod c5 in a rotating way to drive the connecting rod c5 to reciprocate, and the driving synchronism is obviously superior to the cam driving form in the traditional structure, because the connecting rod c5 does not extend into the groove of the cam and moves along the groove of the cam, no contact gap exists, and the conditions of transmission delay and unstable transmission are not easy to occur even in a high-speed running state. In addition, the main shaft 11 is not directly connected with the rotating block c1, but the input transmission shaft 12 and the output transmission shaft 13 are arranged between the main shaft and the rotating block c1, compared with the mode that the main shaft is directly connected with the driving cam in the traditional structure, the structural design of the main shaft can effectively reduce the load of the main shaft 11, and the input transmission shaft 12 and the output transmission shaft 13 are in a gear meshing transmission mode through respective fixed connection gears, so that the transmission precision and the transmission efficiency are high, and the noise is low.

In addition, similar to the rotating block c1, the input transmission shaft 12 extends out of the transmission bearing seat 14 and is fixedly connected with a balance weight 16, as shown in fig. 1 and 4, the balance weight 16 comprises a connecting part for fixedly connecting the input transmission shaft 12 and a counterweight part for reducing the shaking of the machine shell 1 during the operation process, and the connecting part of the balance weight 16 is also in a manner of tightly holding on the input transmission shaft 12; in the operation process of the machine shell 1, the components such as the thread take-up cam f2, the needle bar driving seat c4, the presser foot driving seat e7 and the like and the action of the associated components can generate the shaking with the periodical direction change, and the counterweight part of the counterweight 16 is used for counteracting and weakening the shaking in the rotation process.

As shown in fig. 13, the needle bar driving seat c4 is provided with a guide sleeve hole c42 for receiving the needle bar driving guide post c3, a link connecting portion c43 for connecting the link two c6, and a needle bar driving abutment portion c41 for driving the needle bar driving block 221 on the needle bar 22. In this embodiment, the needle bar driving seat c4 itself is also of a symmetrical structure, and the guide sleeve hole c42 has a central cross section coinciding with the central cross section of the needle bar driving seat c 4. The connecting rod connecting part c43 is a connecting cavity opened in the needle bar driving seat c4, and the central section of the connecting cavity is also overlapped with the central section of the needle bar driving seat c 4. The needle bar driving abutting part c41 is a slot penetrating horizontally and opening towards the side of the needle bar 22, because the needle bar frame 2 is connected to the casing 1 in a sliding manner, the needle bar 22 is also provided with a needle bar driving block 221, the needle bar driving block 221 is provided with an abutting joint matched with the slot, and when the needle bar driving block 221 moves horizontally along with the needle bar frame 2, the needle bar driving block can slide into the slot horizontally. The central cross section of the needle bar drive abutment c41 is also symmetrical with the central cross section of the needle bar drive holder c 4. The needle bar driving seat c4 is further provided with an outer wall opening c421 for exposing a partial region of the guide sleeve hole c42 to the outside, so as to reduce the contact surface between the inner wall of the guide sleeve hole c42 and the needle bar driving guide post c3, thereby reducing frictional resistance and making the elevation of the needle bar driving seat c4 smoother. The top of the needle bar driving seat c4 is also provided with a lubricating cavity c44, a lubricating piece such as felt is arranged in the lubricating cavity c44, and the guide sleeve hole c42 and the connecting rod connecting part c43 are communicated with the lubricating cavity c44 through oil paths.

It is worth mentioning that in practical products, the "symmetry" referred to above cannot be strictly considered as "symmetry" in an absolute sense, for example, the connecting piece c21 may have some minor modifications (e.g. a notch or a protrusion or an opening, etc.) at some place due to manufacturing or assembly interference or connection requirements, which results in the two connecting pieces c21 not being absolutely symmetrical, but should be considered as a symmetrical design in view of the overall structure, which is itself still optimized to obtain and achieve the aforementioned symmetrical design.

As shown in fig. 2 and 14 to 18, the needle bar frame 2 is further provided with a presser foot self-holding mechanism, the presser foot self-holding mechanism includes a fixed frame d1 and a plurality of locking components d2 arranged on the fixed frame d1, the needle bar 22 and the presser foot shaft 23 vertically penetrate through the fixed frame d1, the locking components d2 have a blocking portion d231 capable of moving horizontally and resetting, the presser foot shaft 23 is provided with a matching portion 232, the presser foot shaft 23 is kept in a home position when not driven because the matching portion 232 is blocked by the blocking portion d231, and the presser foot shaft 23 can actively push the blocking portion d231 to lift and lower when driven because the matching portion 232 can. The traditional presser foot self-holding structure is a mode that a spring is sleeved on a presser foot shaft and returns to the original position through the spring force after the presser foot shaft moves downwards, the operation of the presser foot is unstable easily caused by the vibration of a machine head in the sleeve for a plurality of times in the mode, the non-working presser foot cannot be kept in the original position without moving, in addition, the whole reaction force generated by compression is transmitted to a driving mechanism by the spring sleeved in the mode when the spring is used, the operation load of the driving mechanism is increased, the novel presser foot self-holding structure arranged in the scheme removes the spring originally carried on the presser foot shaft 23, the problems are solved, the working presser foot and the non-working presser foot are stable in use, and the load born by the driving mechanism connected with the presser foot shaft 23 is also greatly reduced.

As shown in fig. 15, the fixed frame d1 includes a front panel d11, a rear panel d12 and a bottom plate d13 connected between the front panel d11 and the rear panel d12, the front panel d11 and the rear panel d12 are respectively and fixedly connected with the needle bar frame 2, a plurality of vertical through holes d131 opened towards one side of the front panel d11 are arranged on the bottom plate d13 at intervals, and the needle bar 22 and the presser foot shaft 23 can pass through the vertical through holes; the front panel d11 is provided with a plurality of horizontal through holes d111 at intervals, where the horizontal through holes d111 are provided for the presser foot driving block 231, because the matching portion 232 is provided on the presser foot driving block 231 in this embodiment rather than being independently provided on the presser foot shaft 23 (of course, the presser foot driving block 231 and the matching portion 232 may be two independent components on the presser foot shaft 23, and it is a preferable mode in this embodiment that the presser foot driving block 231 and the matching portion 232 are combined together), and the horizontal through holes d111 are provided for allowing the presser foot driving block 231 to be lifted and lowered on the fixing frame d1 without interference when being abutted with the presser foot driving mechanism. The vertical through hole d131 is communicated with the horizontal through hole d111 in a crossing manner, and locking assemblies d2 connected to the front panel d11 and the rear panel d12 are arranged on two sides of each crossing horizontal through hole d111 and the vertical through hole d 131.

And the locking assembly d2 includes a guide rod d21, a return spring d22 and a locking block d23, see fig. 14, in this embodiment, the guide rod d21 is slidably connected to the front panel d11 and the rear panel d12, the locking block d23 is correspondingly fixedly connected to the guide rod d21, that is, the locking block d23 is fixed relative to the guide rod d21, and the guide rod d21 can slide back and forth relative to the fixed frame d1 (in another embodiment, the guide rod d21 can also be selectively fixedly penetrated through the front panel d11 and the rear panel d12, the locking block d23 is correspondingly slidably connected to the guide rod d21, that is, the guide rod d21 is fixed relative to the fixed frame d1, and the locking block d23 can slide back and forth relative to the guide rod d 21), the return spring d22 is sleeved on the guide rod d21, the tail end of the return spring d22 abuts against the fixed frame d1, and the head end abuts against the locking block d23, the locking block d23 is provided with a blocking portion d231, and the blocking portion d231 has an upper half portion for supporting the engaging portion 232 and being capable of being pushed open from top to bottom by the engaging portion 232, and a lower half portion being capable of being pushed open. As shown in fig. 16, 17 and 18, the blocking portion d231 is disposed on the side surface of the locking block d23, the middle of the blocking portion is convex, the upper half portion and the lower half portion are both inclined surfaces, the matching portion 232 is a pressing block disposed on the side surface of the pressing pin driving block 231 and provided with an inclined surface matched with the pressing block, the inclined surfaces of the pressing block and the matching portion are in sliding contact, and the matching portion 232 can push the blocking portion d231 open in the lifting process under the driving of an external force.

It will be appreciated by persons skilled in the art that the embodiments of the invention described above and shown in the drawings are given by way of example only and are not limiting of the invention. The objects of the present invention have been fully and effectively accomplished. The functional and structural principles of the present invention have been shown and described in the embodiments, and any variations or modifications may be made to the embodiments of the present invention without departing from the principles.