阅读说明：本技术 花样行缝机缝针处无接触压紧装置 (Non-contact pressing device at sewing needle position of pattern sewing machine ) 是由 龙云刚 廖飞跃 于 2019-11-28 设计创作，主要内容包括：本发明公开了一种花样行缝机缝针处无接触压紧装置,涉及一种用于将行缝机缝针处的工件压紧在工作台上装置。它包括机体、可旋转机头、压脚、喷气咀体和机头气管,可旋转机头上端通过机头连接杆与机体连接,可旋转机头下端连接有带有针头的针杆,压脚上安装有针管压脚,喷气咀体包括垂直管和环形平面管,垂直管和环形平面管内均设有气体通道,垂直管上安装有咀体支脚,且垂直管通过咀体支脚安装在机体或可旋转机头上,环形平面管底部安装有多个用于向工件喷气的咀体喷气孔,且环形平面管上开设有用于供针杆通过的咀体开口槽。本发明可改善缝线针脚的均匀性和一致性,提高生产效率,提高优良品率。(The invention discloses a non-contact pressing device at a sewing needle of a pattern sewing machine, and relates to a device for pressing a workpiece at the sewing needle of the sewing machine on a workbench. It includes the organism, rotatable aircraft nose, the presser foot, the body and aircraft nose trachea are chewed in the jet-propelled, rotatable aircraft nose upper end is passed through the aircraft nose connecting rod and is connected with the organism, rotatable aircraft nose lower extreme is connected with the needle bar that has the syringe needle, install the needle tubing presser foot on the presser foot, the body is chewed including perpendicular pipe and annular plane pipe in the jet-propelled, all be equipped with gas passage in perpendicular pipe and the annular plane pipe, install on the perpendicular pipe and chew the body stabilizer blade, and perpendicular pipe is installed on organism or rotatable aircraft nose through chewing the body stabilizer blade, annular plane socle portion installs a plurality of body fumaroles that are used for to the jet-propelled work piece, and offer on the annular plane. The invention can improve the uniformity and consistency of stitches of the suture, improve the production efficiency and improve the rate of good products.)

1. The utility model provides a pattern line sewing machine seam needle department contactless closing device, includes organism (1) that is located the upper end, can constantly adjust the direction and be located rotatable aircraft nose (2) at middle part according to the decorative pattern of making up to and be used for compressing tightly work piece and be located presser foot (5) of aircraft nose below, rotatable aircraft nose (2) upper end is connected with organism (1) through aircraft nose connecting rod (8), and rotatable aircraft nose (2) lower extreme is connected with needle bar (3) that have syringe needle (31), install on presser foot (5) with needle tubing (51) that the position of needle bar (3) corresponds, its characterized in that: the gas injection nozzle comprises a gas injection nozzle body (7) used for compressing a workpiece through compressed air and a nose gas pipe (6) arranged at the bottom of a nose and internally provided with compressed air, wherein the gas injection nozzle body (7) comprises a vertical pipe (74) which is integrally arranged in a straight line shape and an annular plane pipe (75) which is integrally arranged in an annular shape, gas channels (73) which are communicated with each other and used for gas to pass through are respectively arranged in the vertical pipe (74) and the annular plane pipe (75), one end of each gas channel (73) in the annular plane pipe (75) penetrates through the vertical pipe (74) and is communicated with the nose gas pipe (6), the other end of each gas channel is in a closed state, nozzle body supporting legs (71) are arranged on the vertical pipe (74), the vertical pipe (74) is arranged on a machine body (1) or a rotatable nose (2) through the nozzle body supporting legs (71), a plurality of nozzle body holes (72) used for injecting gas to the workpiece are arranged at the bottom of, and the annular plane pipe (75) is provided with a mouth opening groove (76) for the needle bar (3) to pass through.

2. The non-contact pressing device at the sewing needle of the pattern sewing machine according to claim 1, characterized in that: the air injection nozzle body (7) is provided with four nozzle body air injection holes (72) which are uniformly distributed.

3. The non-contact pressing device at the sewing needle of the pattern sewing machine according to claim 1 or 2, characterized in that: the needle tube pressing foot is characterized in that the pressing foot (5) comprises a pressing foot base (57) and pressing foot supporting blocks (58), the pressing foot supporting blocks (58) are installed at the upper end of the pressing foot base (57), the needle tube pressing foot (51) is installed at the lower end of the pressing foot base (57), needle tube holes (53) corresponding to the positions of the needle tube pressing foot (51), pressing foot air inlet connectors (56) communicated with a machine head air tube (6) and a plurality of pressing foot air injection holes (54) arranged at intervals are installed on the pressing foot base (57), and pressing foot air inlet channels (55) used for allowing air to pass through are arranged between the pressing foot air inlet connectors (56) and each pressing foot air injection hole (54).

4. The non-contact pressing device at the sewing needle of the pattern sewing machine according to claim 3, characterized in that: the bottom of the presser foot base (57) is provided with a presser foot air injection sleeve (52) which corresponds to the position of the presser foot air injection hole (54) and is communicated with the presser foot air injection hole (54).

5. The non-contact pressing device at the sewing needle of the pattern sewing machine according to claim 4, characterized in that: the horizontal section of the presser foot supporting block (58) is U-shaped, and a presser foot supporting groove (59) is arranged at the upper end of the presser foot supporting block (58).

Technical Field

The invention relates to a device for pressing a workpiece at a sewing needle of a pattern sewing machine on a workbench, in particular to a non-contact pressing device at the sewing needle of the pattern sewing machine.

Background

When the sewing machine works, a workpiece at a sewing needle is pressed on a workbench, and the current methods for pressing the workpiece mainly comprise two methods (both methods are contact pressing):

the first is to use a semi-circular presser foot at the bottom and a small fork sewing needle at the front end. However, since the outer shape of the presser foot exceeds 15 mm, when the workpiece is clamped by the clamp, the 15 mm side needs to be kept to avoid the interference between the clamp and the presser foot. When the first pressing method is used for sewing a complicated flower shape, edges are easy to sew, so that the appearance of a workpiece is influenced, the edges are often required to be cut again, redundant materials are cut, and labor and materials are wasted.

The second one is to make a needle sleeve with a diameter of about 4mm, a hole of 2 mm is opened on the inner surface, the needle head moves in the hole, and the needle sleeve is directly pressed on the workpiece. Although the second pressing method can sew the edge, the pressing contact surface is small, the workpiece needs to be pulled hard in the sewing direction, and therefore when sewing and turning are carried out, the workpiece is pulled and deformed, the sewing thread stitch is uneven, and the appearance is affected. When the same direction is adopted for raising and sewing, the efficiency is reduced by more than 30 percent due to the influence of the idle stroke.

Therefore, in view of the above, the conventional devices for pressing the workpiece on the worktable of the sewing machine obviously have the disadvantages, and there is a need for improvement.

Disclosure of Invention

The invention aims to overcome the defects of the background technology and provide a non-contact pressing device at a sewing needle of a pattern sewing machine.

In order to achieve the purpose, the technical scheme of the invention is as follows: a non-contact pressing device at a sewing needle of a pattern sewing machine comprises a machine body positioned at the upper end, a rotatable machine head which can continuously adjust the direction according to the sewed patterns and is positioned at the middle part, a presser foot which is used for pressing a workpiece and is positioned below the machine head, the upper end of the rotatable machine head is connected with the machine body through a machine head connecting rod, the lower end of the rotatable machine head is connected with a needle rod with a needle head, a needle tube presser foot which corresponds to the position of the needle rod is arranged on the presser foot, the non-contact pressing device also comprises an air injection nozzle body which is used for pressing the workpiece through compressed air, and a machine head air tube which is arranged at the bottom of the machine head and is internally provided with compressed air, the air injection nozzle body comprises a vertical tube which is integrally arranged in a straight line shape and an annular plane tube which is integrally arranged, the vertical tube and the annular plane tube are internally provided with air channels which are, the other end is in a closed state, the vertical pipe is provided with a nozzle body supporting leg, the vertical pipe is arranged on the machine body or the rotatable machine head through the nozzle body supporting leg, the bottom of the annular plane pipe is provided with a plurality of nozzle body air injection holes used for injecting air to the workpiece, and the annular plane pipe is provided with a nozzle body open slot used for allowing the needle rod to pass through.

In the technical scheme, the air injection nozzle body is provided with four nozzle body air injection holes which are uniformly distributed.

In the technical scheme, the presser foot comprises a presser foot base and a presser foot supporting block, the presser foot supporting block is installed at the upper end of the presser foot base, the needle tube presser foot is installed at the lower end of the presser foot base, a needle tube hole corresponding to the position of the needle tube presser foot, a presser foot air inlet connector communicated with a machine head air tube and a plurality of presser foot air injection holes arranged at intervals are installed on the presser foot base, and a presser foot air inlet channel used for allowing air to pass through is arranged between the presser foot air inlet connector and each presser foot air injection hole.

In the technical scheme, the bottom of the presser foot base is provided with a presser foot air injection sleeve which corresponds to the position of the presser foot air injection hole and is communicated with the presser foot air injection hole.

In the technical scheme, the horizontal section of the presser foot supporting block is U-shaped, and the upper end of the presser foot supporting block is provided with a presser foot supporting groove.

Compared with the prior art, the invention has the following beneficial effects:

1. the invention adopts air pressure to assist in pressing and adopts a needle tube presser foot of about 4mm to sew, thereby the invention can sew the edge of a workpiece and save materials; meanwhile, the invention can avoid the problem of higher idle stroke in the prior art, can sew workpieces back and forth, improves the efficiency by more than 30 percent, and ensures the sewing quality and the stitch attractiveness.

2. The invention mainly adds the air injection nozzle body 7 and the nose air pipe 6 on the machine body 1 or the rotatable nose 2, and the air injected by the air injection nozzle body 7 is matched with the nose air pipe 6, so that the workpiece is pressed by the air injected by the air injection nozzle body 7, and the non-contact pressing function is realized.

3. The structure of the existing presser foot is improved, so that the needle tube sleeve 55 and the 4 presser foot air injection holes 54 synchronously and vertically inject air to press a workpiece when the presser foot is in work, the condition that the workpiece is easy to bulge when being sewn (namely, the work bulge is improved), the uniformity and consistency of stitches of a sewing thread can be improved, the production efficiency is improved, and the rate of good products is improved.

Drawings

FIG. 1 is a schematic view of the present invention using a conventional presser foot;

FIG. 2 is a schematic structural view of the air injection nozzle body of the present invention;

FIG. 3 is a schematic view of the structure of the presser foot of the present invention;

FIG. 4 is a schematic view of the structure of the present invention when the air nozzle body is mounted on the rotatable head and the present invention uses the existing presser foot;

FIG. 5 is a schematic view of the structure of the present invention when the air nozzle body is installed on the body and the existing presser foot is used;

fig. 6 is a schematic structural view of the presser foot of the present invention in place of the conventional presser foot.

In the figure, 1-machine body, 2-rotatable machine head, 3-needle rod, 31-needle head, 4-presser foot rod, 41-presser foot bolt, 5-presser foot, 51-needle tube presser foot, 52-presser foot air injection sleeve, 53-needle tube hole, 54-air injection hole, 55-presser foot air inlet channel, 56-presser foot air inlet joint, 57-presser foot base, 58-presser foot supporting block, 59-presser foot supporting groove, 51-needle tube presser foot, 6-machine head air tube, 7-air injection nozzle body, 71-nozzle body supporting foot, 72-nozzle body air injection hole, 73-air channel, 74-vertical tube, 75-annular plane tube, 76-nozzle body open slot and 8-machine head connecting rod.

Detailed Description

The embodiments of the present invention will be described in detail with reference to the accompanying drawings, which are not intended to limit the present invention, but are merely exemplary. While the advantages of the invention will be clear and readily understood by the description.

The invention mainly provides a non-contact pressing device at a sewing needle of a pattern sewing machine, which comprises an air injection nozzle body 7 for pressing a workpiece through compressed air, a machine head air pipe 6 which is arranged at the bottom of the machine head and is internally provided with the compressed air, a machine body 1 which is positioned at the upper end, a rotatable machine head 2 which can continuously adjust the direction according to the sewed patterns and is positioned at the middle part, and a presser foot 5 which is used for pressing the workpiece and is positioned below the machine head, wherein the machine body 1, the rotatable machine head 2 and the presser foot 5 are all devices existing in the prior art.

Specifically, the structure of the non-contact pressing device at the sewing needle of the pattern sewing machine comprises:

1) fig. 1 is a schematic structural view of the present invention when using the existing presser foot, fig. 1 reflects the relevant parts of the sewing machine, when in operation, the needle tube presser foot 51 presses the workpiece through the presser bar 4, the needle 31 is drawn into the needle tube hole 53 through the needle bar 3 to sew the workpiece, the rotatable head 2 continuously adjusts the direction according to the pattern to be sewed, when the workpiece is walking at high speed, the sewing stitch is uneven due to the convex in the forward direction when pulling. Particularly, when the sewing machine is used for reverse circulation sewing, the appearance is affected and the appearance is poor due to inconsistent stitches of the sewing threads.

Specifically, the sewing machine comprises an air injection nozzle body 7 used for compressing a workpiece through compressed air, a machine head air pipe 6 which is arranged at the bottom of the machine head and is internally provided with the compressed air, a machine body 1 which is positioned at the upper end, a rotatable machine head 2 which can continuously adjust the direction according to the pattern to be sewn and is positioned at the middle part, and a presser foot 5 which is used for compressing the workpiece and is positioned below the machine head, wherein the upper end of the rotatable machine head 2 is connected with the machine body 1 through a machine head connecting rod 8, the lower end of the rotatable machine head 2 is connected with a needle rod 3 with a needle head 31, and the presser foot 5 is provided with.

2) Fig. 2 is a schematic view of the structure of the newly added jet nozzle body of the invention, the shape of the jet nozzle body 7 is similar to the detecting head of the mine control measuring instrument in the army, and the jet nozzle body is composed of a vertical pipe 74 and an annular plane pipe 75, the vertical pipe 74 and the annular plane pipe 75 are internally provided with an air channel 73, the tail end of the annular plane pipe 75 is blocked, the lower part of the annular plane is provided with 4 air injection holes 72, and the upper end is provided with an air connecting nozzle 73 and a mounting support leg 71.

Specifically, the air injection nozzle body 7 comprises a vertical pipe 74 and an annular planar pipe 75, the vertical pipe 74 and the annular planar pipe 75 are both internally provided with air channels 73 which are communicated with each other and used for air to pass through, one end of each air channel 73 in the annular planar pipe 75 penetrates through the vertical pipe 74 and is communicated with the nose air pipe 6, the other end of each air channel is in a closed state, the vertical pipe 74 is provided with a nozzle body supporting leg 71, the vertical pipe 74 is arranged on the machine body 1 or the rotatable nose 2 through the nozzle body supporting leg 71, the bottom of the annular planar pipe 75 is provided with a plurality of nozzle body air injection holes 72 used for injecting air to a workpiece, and the annular planar pipe 75 is provided with a nozzle body open slot 76 used for a needle rod 3 to pass through.

Preferably, four nozzle body air injection holes 72 which are uniformly distributed are arranged on the air injection nozzle body 7.

3) Fig. 3 is a schematic structural diagram of the presser foot of the present invention, the original presser foot 5 (the presser foot in fig. 1) is replaced by the special presser foot 5 (the presser foot in fig. 3) of the present invention, the presser foot 5 is mounted on the presser bar 4 through the presser foot bolt 41, the needle tube sleeve 55 and the 4 presser foot air injection holes 54 enter into the vertical air injection to press the workpiece during operation, thereby improving the condition that the workpiece is easy to bulge during sewing (i.e. improving the working bulge), improving the uniformity and consistency of the stitch of the sewing thread, improving the production efficiency, and improving the quality product rate.

Specifically, the structure of the presser foot designed by the invention is as follows: the presser foot 5 comprises a presser foot base 57 and a presser foot supporting block 58, the presser foot supporting block 58 is mounted at the upper end of the presser foot base 57, the needle tube presser foot 51 is mounted at the lower end of the presser foot base 57, the presser foot base 57 is provided with a needle tube hole 53 corresponding to the position of the needle tube presser foot 51, a presser foot air inlet connector 56 communicated with the machine head air tube 6 and a plurality of presser foot air injection holes 54 arranged at intervals, and a presser foot air inlet channel 55 for allowing air to pass through is arranged between the presser foot air inlet connector 56 and each presser foot air injection hole 54. Preferably, the bottom of the presser foot base 57 is provided with a presser foot air injection sleeve 52 corresponding to the position of the presser foot air injection hole 54 and communicated with the presser foot air injection hole 54. Preferably, the horizontal cross section of the presser foot support block 58 is U-shaped, and the upper end of the presser foot support block 58 is provided with a presser foot support groove 59.

In practice, the non-contact pressing device at the sewing needle of the sewing machine has a plurality of real-time modes, wherein the following various modes can be combined to be used according to requirements, for example, the embodiment 1 or the embodiment 2 can be combined with the embodiment 3 to be used, and each embodiment specifically comprises:

the first embodiment of the present invention is: as shown in fig. 5, the air nozzle body 7 shown in fig. 2 is fixed to the machine body 1 by the machine body bolt 11 via the mounting leg 71. The machine head air pipe 6 is communicated with the air receiving port 73, the air pipe 6 is ventilated simultaneously during needle sewing, pressure air is vertically sprayed to the surface of a workpiece through the air spraying holes 72, the workpiece is pressed in an auxiliary mode, the bulge of the workpiece is improved, the uniformity and the consistency of a sewing line are improved, and the rate of qualified products is improved.

The second embodiment is as follows: as shown in fig. 4, the air nozzle body 7 shown in fig. 2 is fixed to the rotatable head 2 by the head bolt 21 via the mounting leg 71. The handpiece air tube 6 is connected with the air inlet 73. When the device works, the air injection holes 72 are used for ventilating, so that a workpiece is compressed, the bulge of the workpiece is improved, the uniformity and the consistency of a sewing line are improved, and the rate of good products is increased.

The third embodiment of the present invention is: as shown in fig. 6, the original presser foot 5 is replaced by the special air injection presser foot 5, the special air injection presser foot 5 is provided with a presser foot air inlet joint 56, and an inner presser foot air inlet hole 55 is communicated with a plurality of presser foot air injection holes 54 and the needle tube air sleeve 52. The presser foot 5 is arranged on the presser foot rod 4 through a presser foot bolt 41 and is communicated with the machine head air pipe 6 and a presser foot air inlet hole 55. During operation, the tube sleeve 55 and the 4 presser foot air injection holes 54 synchronously and vertically inject air to press the workpiece, so that the condition that the workpiece is easy to bulge during sewing (namely, the work bulge is improved) is improved, the uniformity and consistency of stitches of the sewing threads are improved, the production efficiency is improved, and the quality product rate is improved.

All other parts not described are prior art.