阅读说明：本技术 一种剪线、松线和抬压脚机构以及绷缝机 (Thread trimming, thread loosening and presser foot lifting mechanism and flat seaming machine ) 是由 阮孟定 于 2021-05-28 设计创作，主要内容包括：本专利属于缝纫机技术领域,特指一种剪线、松线和抬压脚机构以及绷缝机,包括剪线组件、松线组件、抬压脚组件和驱动电机,驱动电机为竖向设置的双头电机；所述驱动电机的上端输出轴带动抬压脚组件,驱动电机的下端输出轴带动剪线组件和松线组件,所述驱动电机的下端输出轴上安装有下凸轮,所述驱动电机的下部设置有联动杠杆,联动杠杆水平转动安装在机架上；联动杠杆的内端与所述下凸轮配合,联动杠杆的外端带动剪线连杆和松线连杆；剪线连杆的另一端带动剪线组件,松线连杆的另一端带动松线组件；所述联动杠杆的外端、剪线连杆的一端、松线连杆的一端同轴铰接。本专利中剪线连杆、松线连杆和联动杠杆同轴铰接,进一步简化了传动结构；将剪线组件和松线组件设置成联动,即触发剪线动作的同时,也触发松线动作。(The patent belongs to the technical field of sewing machines, and particularly relates to a thread trimming, thread loosening and presser foot lifting mechanism and a flat seaming machine, which comprise a thread trimming assembly, a thread loosening assembly, a presser foot lifting assembly and a driving motor, wherein the driving motor is a double-end motor which is vertically arranged; an upper end output shaft of the driving motor drives the presser foot lifting assembly, a lower end output shaft of the driving motor drives the thread cutting assembly and the thread loosening assembly, a lower cam is mounted on the lower end output shaft of the driving motor, a linkage lever is arranged at the lower part of the driving motor, and the linkage lever is horizontally and rotatably mounted on the rack; the inner end of the linkage lever is matched with the lower cam, and the outer end of the linkage lever drives the thread trimming connecting rod and the thread loosening connecting rod; the other end of the thread trimming connecting rod drives the thread trimming assembly, and the other end of the thread loosening connecting rod drives the thread loosening assembly; the outer end of the linkage lever, one end of the thread trimming connecting rod and one end of the thread loosening connecting rod are coaxially hinged. According to the novel thread trimming connecting rod, the thread loosening connecting rod and the linkage lever are coaxially hinged, so that a transmission structure is further simplified; the thread cutting assembly and the thread loosening assembly are arranged in a linkage mode, namely the thread cutting action is triggered, and meanwhile the thread loosening action is triggered.)

1. A thread trimming, thread loosening and presser foot lifting mechanism comprises a thread trimming assembly (20), a thread loosening assembly (30), a presser foot lifting assembly (40) and a driving motor (1), wherein the driving motor (1) is a vertically arranged double-end motor; the upper end output shaft (11) of the driving motor (1) drives the presser foot lifting assembly (40), the lower end output shaft (12) of the driving motor (1) drives the thread trimming assembly (20) and the thread loosening assembly (30), and the thread trimming device is characterized in that,

a lower cam (121) is arranged on the lower end output shaft (12) of the driving motor (1),

a linkage lever (13) is arranged at the lower part of the driving motor (1), and the linkage lever (13) is horizontally and rotatably arranged on the rack (5); the inner end of the linkage lever (13) is matched with the lower cam (121), and the outer end of the linkage lever (13) drives the thread trimming connecting rod (21) and the thread releasing connecting rod (31); the other end of the thread trimming connecting rod (21) drives the thread trimming component (20), and the other end of the thread loosening connecting rod (31) drives the thread loosening component (30);

the outer end of the linkage lever (13), one end of the thread trimming connecting rod (21) and one end of the thread loosening connecting rod (31) are coaxially hinged.

2. A thread trimming, thread slacking and presser foot lifting mechanism according to claim 1, wherein the thread slacking assembly (30) comprises a thread slacking crank (32), the thread slacking crank (32) being movable in a vertical plane;

the middle part of the thread releasing connecting rod (31) is bent, so that the upper end of the thread releasing connecting rod (31) is vertical and is hinged with the thread releasing crank (32), and the lower end of the thread releasing connecting rod (31) is horizontal and is hinged with the outer end of the linkage lever (13).

3. A thread trimming, thread slacking and presser foot lifting mechanism according to claim 2, wherein the upper end of the thread slacking connecting rod (31) is in spherical connection with the thread slacking crank (32);

or the upper end of the thread releasing connecting rod (31) is hinged with the thread releasing crank (32) in a loose mode, so that the thread releasing connecting rod (31) and the thread releasing crank (32) have certain degree of freedom in the horizontal direction.

4. A thread trimming, thread slacking and presser foot lifting mechanism according to claim 1, wherein said thread trimming link (21) moves in a horizontal plane;

the outer end of the linkage lever (13) is provided with an extension end (132) downwards, and the extension end (132) is used for compensating the height difference between the trimming connecting rod (21) and the linkage lever (13).

5. The thread trimming, thread slacking and presser foot lifting mechanism according to claim 1, wherein the presser foot lifting assembly (40) comprises a presser foot lifting shaft (41), a rear presser foot crank (42) is mounted at the rear end of the presser foot lifting shaft (41), a front presser foot crank (43) is mounted at the front end of the presser foot lifting shaft (41), and the front presser foot crank (43) drives a presser foot rod (45) to lift up and down;

an upper cam (111) is mounted on the upper end output shaft (11), and a spherical surface sleeve (421) is mounted at the end part of the rear presser foot crank (42); the working curved surface of the upper cam (111) is abutted with the spherical sleeve (421).

6. A thread trimming, thread slacking and presser foot lifting mechanism according to claim 5, characterized in that the front end of the presser foot lifting shaft (41) extends to the head (53) position, and the middle part of the presser foot lifting shaft (41) is sleeved with a return spring (44) to keep the spherical sleeve (421) against the upper cam (111).

7. A thread trimming, thread slacking and presser foot lifting mechanism according to claim 1, wherein the working curved surface of the lower cam (121) is a rail groove (122); the inner end of the linkage lever (13) is provided with a movable pin (131), and the movable pin (131) is embedded into the rail groove (122) and moves along the rail groove (122).

8. A thread cutting, thread slacking and presser foot lifting mechanism according to claim 1, characterized in that a motor groove (52) is opened at the rear side of the vertical supporting portion (51) of the frame (5), and the driving motor (1) is fitted into the motor groove (52).

9. The thread trimming, thread releasing and presser foot lifting mechanism according to claim 1, wherein the two end planes of the driving motor (1) are respectively provided with a bent installation angle iron (14), the inner end of the installation angle iron (14) is positioned in the motor groove (52) and connected with one end plane of the driving motor (1), and the outer end of the installation angle iron (14) is positioned outside the motor groove (52) and connected with one side of the notch of the motor groove (52).

10. A flat seaming machine comprising the thread trimming, thread slacking and presser foot lifting mechanism of any one of claims 1 to 9.

Technical Field

This patent belongs to sewing machine technical field, refers in particular to a trimming, thread loosening and presser foot lifting mechanism and flat seaming machine.

Background

CN202011241764.1 discloses a thread trimming component, a thread releasing component and a presser foot lifting component of a flat seaming machine, wherein a frame is provided with a motor, the motor has two driving ends, one driving end drives the thread trimming component and the thread trimming component, the other driving end drives the presser foot lifting component, wherein, a thread releasing ejector rod, a presser foot lifting ejector rod and a thread trimming ejector rod are respectively independent, which results in a very complex transmission structure, and all the thread releasing ejector rod, the presser foot lifting ejector rod and the thread trimming ejector rod are exposed at the rear part of the frame, thereby having potential safety hazard.

It should be pointed out that in the sewing machine industry, parts are extremely complex, and the self-production rate of the parts of an enterprise is low (a thread cutting assembly, a thread loosening assembly and a presser foot lifting assembly of a flat seaming machine are all matched parts in the market, so that the self-production cost of the enterprise is high); therefore, the structure of the mature machine model is difficult to greatly change, and in the case, only the modification can be carried out on the drive motor and the transmission structure directly related to the drive motor.

Disclosure of Invention

The purpose of this patent is to provide a transmission structure is simpler, and is located inside trimming, thread slackening and lift presser foot mechanism and the flat seaming machine of frame.

The purpose of this patent is so realized:

a thread trimming, thread loosening and presser foot lifting mechanism comprises a thread trimming assembly, a thread loosening assembly, a presser foot lifting assembly and a driving motor, wherein the driving motor is a double-head motor which is vertically arranged; an upper end output shaft of the driving motor drives the presser foot lifting assembly, a lower end output shaft of the driving motor drives the thread trimming assembly and the thread loosening assembly, a lower cam is arranged on a lower end output shaft of the driving motor,

a linkage lever is arranged at the lower part of the driving motor and horizontally and rotatably arranged on the rack; the inner end of the linkage lever is matched with the lower cam, and the outer end of the linkage lever drives the thread trimming connecting rod and the thread loosening connecting rod; the other end of the thread trimming connecting rod drives the thread trimming assembly, and the other end of the thread loosening connecting rod drives the thread loosening assembly;

the outer end of the linkage lever, one end of the thread trimming connecting rod and one end of the thread loosening connecting rod are coaxially hinged.

Further, the thread releasing assembly comprises a thread releasing crank, and the thread releasing crank moves in a vertical plane;

the middle part of the thread releasing connecting rod is bent, so that the upper end of the thread releasing connecting rod is vertical and is hinged with the thread releasing crank, and the lower end of the thread releasing connecting rod is horizontal and is hinged with the outer end of the linkage lever.

Furthermore, the upper end of the thread releasing connecting rod is in spherical connection with the thread releasing crank;

or the upper end of the thread releasing connecting rod is hinged with the thread releasing crank in a loose mode, so that the thread releasing connecting rod and the thread releasing crank have certain degree of freedom in the horizontal direction.

Further, the thread trimming connecting rod moves in a horizontal plane;

the outer end of the linkage lever is downwards provided with an extension end which is used for compensating the height difference between the trimming connecting rod and the linkage lever.

Furthermore, the presser foot lifting assembly comprises a presser foot lifting shaft, the rear end of the presser foot lifting shaft is provided with a rear presser foot crank, the front end of the presser foot lifting shaft is provided with a front presser foot crank, and the front presser foot crank drives the presser foot rod to lift up and down;

an upper cam is mounted on the upper end output shaft, and a spherical surface sleeve is mounted at the end part of the rear presser foot crank; the working curved surface of the upper cam is mutually abutted with the spherical sleeve.

Further, the front end of the presser foot lifting shaft extends to the machine head, and a return spring is sleeved in the middle of the presser foot lifting shaft, so that the spherical sleeve is kept to abut against the upper cam.

Furthermore, the working curved surface of the lower cam is a rail groove; and a movable pin is arranged at the inner end of the linkage lever, is embedded into the rail groove and moves along the rail groove.

Further, a motor groove is formed in the rear side of the vertical supporting portion of the rack, and the driving motor is installed in the motor groove.

Further, all be equipped with the installation angle bar of buckling on the plane of motor both ends, installation angle bar inner is located the motor inslot is connected with motor one end plane, and installation angle bar outer end position is in the motor inslot is outer and is connected with notch one side in motor groove.

A flat seaming machine is characterized by comprising the thread trimming mechanism, the thread loosening mechanism and the presser foot lifting mechanism.

Compared with the prior art, the patent has the outstanding and beneficial technical effects that:

the vertical supporting part of the frame is provided with a motor groove, and the motor is arranged in the motor groove, so that the matching of the upper end output shaft and the presser foot lifting shaft is hidden in the frame, the presser foot lifting shaft cannot be interfered by the outside, and the matching is stable; meanwhile, the distance between the output shaft at the upper end and the presser foot lifting shaft is short, and the mode of a crank connecting rod is not suitable, so that the upper cam and the spherical sleeve are adopted for matched transmission, and power is better transmitted within a relatively limited distance;

the lower end output shaft of the motor is matched with the linkage lever through the rail groove of the lower cam, and the execution efficiency of the inner end of the linkage lever is higher due to the design of the rail groove; meanwhile, the middle part of the linkage lever is rotatably arranged in the motor groove, and the rotating point is positioned on the rack below the motor, so that the outer end of the linkage lever can finish transmission only by slightly extending out of the motor groove, and the linkage lever is simple and reliable;

the thread cutting connecting rod, the thread loosening connecting rod and the linkage lever are coaxially hinged, so that the transmission structure is further simplified; the thread cutting assembly and the thread loosening assembly are set to be linked, namely, the thread cutting action is triggered and the thread loosening action is also triggered; the height difference between the linkage lever and the trimming connecting rod is compensated through the extension end, so that the trimming device is adaptive to the existing trimming component; the upper end of the thread loosening connecting rod is hinged with the thread loosening crank in a loosening manner, so that the thread loosening connecting rod and the thread loosening crank have certain degree of freedom in the horizontal direction; the motion trail of the lower end of the thread releasing connecting rod is arc-shaped motion in the horizontal plane, and the motion trail of the lower end of the thread releasing crank is arc-shaped motion in the vertical plane, so that the thread releasing action is prevented from being influenced by the fact that the thread releasing crank works and is clamped in the transmission process.

Drawings

FIG. 1 is a schematic view of the flat seaming machine of this patent.

FIG. 2 is a schematic view of the back structure of the flat seaming machine of this patent.

FIG. 3 is a schematic view of the internal structure of the flat seaming machine of this patent

Fig. 4 is a schematic structural view of the thread trimming assembly, the thread slacking assembly and the presser foot lifting assembly.

Fig. 5 is a bottom view of the thread trimming assembly, the thread slacking assembly and the presser foot lifting assembly.

Fig. 6 is a schematic structural diagram of the thread cutting assembly and the thread loosening assembly.

The reference numerals in the figures denote the meanings:

1. a drive motor; 11. an upper end output shaft; 111. an upper cam; 12. a lower end output shaft; 121. a lower cam; 122. a rail groove; 13. a linkage lever; 131. a movable pin; 132. an extension end; 14. mounting angle iron; 20. a thread trimming assembly; 21. trimming connecting rods; 30. a thread releasing assembly; 31. a thread releasing connecting rod; 32. a thread releasing crank; 33. loosening the bobbin; 40. lifting the presser foot assembly; 41. a presser foot lift shaft; 42. a rear presser crank; 421. spherical surface sleeves; 43. a front presser crank; 44. a return spring; 45. a presser bar; 5. a frame; 51. a vertical support portion; 52. a motor slot; 53. a handpiece.

Detailed Description

This patent is further described below in conjunction with specific examples:

as shown in fig. 1, a flat seaming machine comprises a frame 5, wherein a thread trimming mechanism, a thread loosening mechanism and a presser foot lifting mechanism are arranged inside the frame 5; the existing flat seaming machine needs to finish three actions during working: thread trimming, thread loosening and presser foot lifting; in this patent, the thread cutting, thread loosening and presser foot lifting mechanism comprises a thread cutting assembly 20, a thread loosening assembly 30 and a presser foot lifting assembly 40, most of the structures of the above components are basically mature and basically are matching parts on the market, so the specific working principle of the above components is not further discussed in this patent.

The thread trimming device comprises a thread trimming component 20, a thread loosening component 30 and a presser foot lifting component 40, and further comprises a driving motor 1, wherein the driving motor 1 is a double-head motor which is vertically arranged, output shafts are arranged at two ends of the driving motor 1 and comprise an upper end output shaft 11 and a lower end output shaft 12, the upper end output shaft 11 of the driving motor 1 drives the presser foot lifting component 40, and the lower end output shaft 12 of the driving motor 1 drives the thread trimming component 20 and the thread loosening component 30; the existing flat seaming machine is provided with the presser foot lifting assembly 40 basically arranged at the upper side of the flat seaming machine, and the thread trimming assembly 20 and the thread loosening assembly 30 are mostly arranged at the lower side and the side of the flat seaming machine, so that the existing flat seaming machine is arranged;

wherein, a lower cam 121 is arranged on the lower end output shaft 12 of the driving motor 1,

a linkage lever 13 is arranged at the lower part of the driving motor 1, and the linkage lever 13 is horizontally and rotatably arranged on the rack 5; the inner end of the linkage lever 13 is matched with the lower cam 121, and the outer end of the linkage lever 13 drives the thread trimming connecting rod 21 and the thread releasing connecting rod 31; the other end of the thread trimming connecting rod 21 drives the thread trimming component 20, and the other end of the thread loosening connecting rod 31 drives the thread loosening component 30;

the outer end of the linkage lever 13, one end of the thread trimming connecting rod 21 and one end of the thread releasing connecting rod 31 are coaxially hinged.

As shown in fig. 2 and 4, the presser foot lifting assembly 40 includes a presser foot lifting shaft 41, a rear presser foot crank 42 is installed at the rear end of the presser foot lifting shaft 41, a front presser foot crank 43 is installed at the front end of the presser foot lifting shaft 41, and the front presser foot crank 43 drives the presser foot rod 45 to move up and down, that is, when the presser foot lifting shaft 41 swings, the swing of the presser foot lifting shaft 41 drives the front presser foot crank 43 to swing, so as to drive the presser foot rod 45 to move up and down to realize the lifting or lowering of the presser foot. An upper cam 111 is arranged on the upper end output shaft 11, and a spherical sleeve 421 is arranged at the end part of the rear presser foot crank 42; the working curved surface of the upper cam 111 and the spherical sleeve 421 abut against each other. When the presser foot lifting mechanism works, the upper cam 111 is driven by the driving motor 1 to rotate, the upper cam 111 is provided with an eccentric part, and when the eccentric part abuts against the spherical sleeve 421, the spherical sleeve 421 is pushed by the eccentric part to drive the presser foot lifting shaft 41 to swing towards one side, so that the lifting of the presser foot is realized; when the eccentric portion is no longer in contact with the spherical cover 421, the presser lifting shaft 41 is reset by the weight of the presser bar 45, and the lowering of the presser is completed.

Further, the front end of the presser foot lifting shaft 41 extends to the head position, and the middle part of the presser foot lifting shaft 41 is sleeved with a return spring 44, so that the spherical sleeve 421 is kept to abut against the upper cam 111. As shown in fig. 1, the return spring 44 is a torsion spring, which is wound around the presser foot lifting shaft 41, one end of the return spring 44 is connected to the front presser foot crank 43, and the other end of the return spring is abutted to the frame 5, and the spherical sleeve 421 is held against the upper cam 111 by the torsion force of the return spring 44, thereby increasing the stability of the whole structure.

As shown in fig. 5 and 6, the thread releasing assembly 30 comprises a thread releasing crank 32, the thread releasing crank 32 moves in a vertical plane and is positioned at one side of the driving motor 1, the vertical thread releasing crank 32 is used for being matched with the thread releasing assembly 30 positioned at the side part of the frame 5, the middle part of the thread releasing connecting rod 31 is bent so as to be connected with the thread releasing crank 32 moving in the vertical plane, the upper end of the thread releasing connecting rod 31 is vertical and hinged with the thread releasing crank 32, and the lower end of the thread releasing connecting rod 31 is horizontal and hinged with the outer end of the linkage lever 13. During operation, driving motor 1 drives lower cam 121 rotates, drives linkage lever 13 is the fore-and-aft swing, and linkage lever 13 fore-and-aft swing drives slack line crank 32 is the horizontal hunting to carry out the power turn to the horizontal hunting of transmission to slack line crank 32 through slack line crank 32, drive through slack line crank 32 slack line axle 33 horizontal hunting, final drive slack line subassembly 30 work is carried out the slack line.

The upper end of the thread releasing connecting rod 31 is connected with the thread releasing crank 32 in a spherical manner, namely, the upper end of the thread releasing connecting rod 31 and the lower end of the thread releasing crank 32 are provided with spherical surfaces, and the upper end of the thread releasing connecting rod 31 abuts against the lower end of the thread releasing crank 32 through the spherical surfaces to perform transmission, so that the transmission between the thread releasing connecting rod 31 and the thread releasing crank 32 is smoother during thread releasing; similarly, the upper end of the thread releasing connecting rod 31 is hinged to the thread releasing crank 32 in a loose manner, so that the thread releasing connecting rod 31 and the thread releasing crank 32 have certain degree of freedom in the horizontal direction, and the thread releasing action is prevented from being influenced by the clamping in the transmission process. It should be noted that the loose wire connecting rod 31 and the loose wire crank 32 are directly hinged to each other to realize transmission, but the above structure is provided for smoother transmission.

As shown in fig. 3, in combination with the thread trimming, thread releasing and presser foot lifting mechanisms respectively and independently described above, since the outer end of the linkage lever 13, one end of the thread trimming connecting rod 21 and one end of the thread releasing connecting rod 31 are coaxially hinged, when the driving motor 1 rotates, the upper cam 111 and the lower cam 121 are simultaneously driven to rotate, and the presser foot lifting shaft 41, the thread trimming connecting rod 21 and the thread releasing connecting rod 31 are sequentially driven to move for one cycle by each rotation of the driving motor 1, so that thread releasing, presser foot lifting and thread cutting operations are respectively performed once, and the working flow of the flat seaming machine is realized.

Further, the trimming connecting rod 21 moves in a horizontal plane, the outer end of the linkage lever 13 is provided with an extending end 132 downwards, and the extending end 132 is used for compensating the height difference between the trimming connecting rod 21 and the linkage lever 13; as shown in fig. 4 and 5, the extension end 132 is integrally formed with the linking lever 13, the thread trimming link 21 is hinged to the lower end of the extension end 132, and the thread trimming operation is performed by the thread trimming link 21. When the device works, the lower cam 121 rotates to drive the linkage lever 13 to do reciprocating motion back and forth, the linkage lever 13 drives the trimming connecting rod 21 to do reciprocating motion back and forth, and trimming operation is performed through the reciprocating motion back and forth of the trimming connecting rod 21. The extension 132 is provided to allow the thread cutting assembly 20 to be located at the lower side of the flat seaming machine or the sewing machine in a general flat seaming machine or a sewing machine, and is compensated by the extension 132, so that the thread cutting assembly 20 of most flat seaming machines or sewing machines is adapted.

Further, the working curved surface of the lower cam 121 is a rail groove 122; the inner end of the link lever 13 is mounted with a movable pin 131, and the movable pin 131 is embedded in the rail groove 122 and moves along the rail groove 122. As shown in fig. 4, the movable pin 131 of the link lever 13 is located in the rail groove 122 and moves in the rail groove 122 with the rotation of the lower cam 121, thereby realizing the back and forth reciprocating swing of the link lever 13. The lower cam 121 can also adopt a spherical abutting structure which is the same as that of the upper cam 111, and compared with the rail groove 122 structure, the transmission is more stable, and the occurrence of faults can be effectively reduced. Meanwhile, the upper cam 111 may also adopt a rail groove 122 structure to realize the swing of the presser foot lifting shaft 41.

Further, a motor groove 52 is opened at the rear side of the vertical supporting portion 51 of the frame 5, and the driving motor 1 is installed in the motor groove 52. As shown in fig. 2, the vertical supporting portion 51 is located on one side of the frame 5 close to the hand wheel, an opening is formed on one side of the vertical supporting portion 51 to form the motor slot 52, the driving motor 1 is located in the motor slot 52, and the driving motor 1 is closed through the motor slot 52, so that the touch of a user is prevented, and the safety is relatively higher.

Furthermore, the planes at the two ends of the driving motor 1 are both provided with bent installation angle irons 14, the inner ends of the installation angle irons 14 are positioned in the motor groove 52 and connected with one plane of the motor, and the outer ends of the installation angle irons 14 are positioned outside the motor groove 52 and connected with one side of the notch of the motor groove 52; as shown in fig. 2, the mounting angle 14 is a right-angle, the inner end of the mounting angle 14 is attached to one side end face of the driving motor 1 and is fixedly connected with the driving motor by a screw, and a notch for extending the upper output shaft 11 or the lower conveying shaft is formed in the inner end of the mounting angle 14; the outer end of the mounting angle iron 14 is turned outwards and abuts against one side of the notch of the motor groove 52, and the outer end of the mounting angle iron 14 is fixedly connected with the rack 5 through screws.

The above embodiments are only preferred embodiments of the present patent, and the protection scope of the present patent is not limited thereby, so: all equivalent changes made according to the structure, shape and principle of the patent shall be covered by the protection scope of the patent.