TWI759701B - Automatic cutting device for residual thread and air transmission structure thereof - Google Patents

Abstract

An automatic cutting device for residual thread includes an air transmission structure, an actuator and a cutter structure. The air transmission structure includes a shell cover. The shell cover have a transmission pipe. The transmission pipe includes a suction section and a convey section. The shell cover is provided with an intake hole that connect the suction section and convey section and a vent hole that connect the convey section. The suction section have a suction open. The actuator is fixed inside the shell cover. The cutter structure is located above the actuator and includes a holder, a fixed knife and a moving knife. Wherein the suction open is formed under the fixed knife and the moving knife.

Description

Automatic cutting device for sewing residual thread and its gas delivery structure

The invention relates to a sewing machine technology, in particular to an automatic shearing device for sewing residual thread and its air delivery structure.

Sewing machines are distinguished according to the form of sewing, which can be roughly divided into two categories: Lock Stitching and Chain Stitching. Chain Stitching is the sewing of the sewing part of the fabric along the upper surface of the needle plate on the one hand. Feeding in the direction of travel, on the other hand, by holding the needle thread and moving at least one needle up and down to form a needle thread loop under the needle plate, and by performing an advance and retreat action in a direction approximately orthogonal to the up and down movement path of the needle Before the hook, the needle loop is further captured, and the captured needle loop is looped with other threads by the hook thread held by the hook, thereby forming the stitch of the chain seam in the sewing part of the fabric.

Among them, chain stitches are mostly used in decorative sewing such as underwear, plackets, sleeves, etc., and in order to avoid the loosening of the stitches, the length of the chain stitches when sewing on the upper and lower surfaces of the fabric will be much greater than the length of the fabric And the fabric is exposed to form the residual sewing thread. After that, each residual sewing thread is cut one by one with scissors by manpower, and an appropriate length is reserved for refolding. Finally, the above-mentioned refolding is performed by a lock stitch sewing machine. The remaining sewing thread should be sewn and fixed.

However, the existing methods of dealing with residual sewing thread require a lot of manpower to perform operations, resulting in the inability to effectively reduce labor costs; in addition, the aforementioned manpower-based operation methods also appear to be quite low in production efficiency and stable in quality. Sex is even more difficult to control and ensure.

In view of this, the inventor of the present invention has devoted himself to the research and application of the theory, aiming at the above-mentioned deficiencies of the prior art, to try his best to solve the above-mentioned problems, which is the goal of the present inventor's improvement.

One objective of the present invention is to provide an automatic cutting device for sewing residual thread and its air delivery structure, which can save labor cost and improve production efficiency.

In order to achieve the above-mentioned purpose, the present invention provides an automatic cutting device for sewing residual thread, which includes a gas delivery structure, an actuator and a cutter structure, and the gas delivery structure includes a shell cover, and an inner part of the shell cover is provided There is a gas delivery pipe, the gas delivery pipe comprises a suction section and a conveying section that communicates with the suction section, and is provided with an air inlet that communicates with the suction section and the conveying section in the shell cover and an air inlet that communicates with the conveying section. an exhaust hole with a suction port at the end of the suction section away from the conveying section; the actuator is fixed in the shell cover; the cutter structure is arranged above the actuator, and the cutter structure Including a knife seat, a fixed knife fixed on the knife seat and a movable knife driven by the actuator and cooperating with the fixed knife to cut, wherein the suction port is formed in the scissors between the fixed knife and the movable knife The lower position of the cut.

In order to achieve the above-mentioned purpose, the present invention also provides a gas delivery structure of an automatic shearing device, comprising a shell cover, and a gas delivery pipe is arranged inside the shell cover. a conveying section, and an inlet hole connecting the suction section and the conveying section and an exhaust hole communicating with the conveying section are opened in the shell cover, and an end of the suction section away from the conveying section has a suction point.

The present invention also has the following functions: the air delivery tube is concealed inside the shell cover, so that the volume of the air delivery structure can be greatly reduced, and it is suitable for the processing of small tube openings in infants' clothes. The fixed knife is set in the fixed knife accommodating groove of the needle board seat, and the blade of the movable knife that cooperates with the fixed knife to cut can be lifted to the upper surface of the needle board seat, so that the cut thread is short and beautiful. smooth. Using the suction section as a passive suction channel design can not only save the installation cost of the suction device, but also achieve the suction effect of the suction section by blowing air, which is more economical in terms of use efficiency.

The detailed description and technical content of the present invention are described below in conjunction with the drawings. However, the accompanying drawings are only for reference and description, and are not intended to limit the present invention.

Referring to FIGS. 1 to 4 , the present invention provides an automatic cutting device for sewing residual thread, which mainly includes an air delivery structure 10 , an actuator 20 and a cutter structure 30 .

As shown in FIG. 3 and FIG. 4 , the gas delivery structure 10 includes a shell cover 11 , which is roughly in the form of a U-shaped three-dimensional structure. Inside the shell cover 11 is a gas delivery pipe 12 . The gas delivery pipe 12 mainly includes a suction section 121 and a A conveying section 122 connected to the suction section 121, and an air inlet 13 connecting the suction section 121 and the conveying section 122 and an exhaust hole 14 connecting the conveying section 122 are opened at the two side positions of the shell cover 11, A suction port 1211 is provided at the end of the suction section 121 away from the conveying section 122 .

Wherein the suction section 121 is not formed by suction by using the suction device, but after the gas is blown in from the intake hole 13, and then output from the exhaust hole 14 after passing through the conveying section 122, in the process of the aforementioned gas flow , the gas in the suction section 121 will be taken away by the gas in the aforementioned conveying section 122 , thereby forming a passive suction channel inside the suction section 121 .

Further, the casing cover 11 and the gas delivery pipe 12 are integrally formed, and a plurality of reinforcing ribs 15 and a plurality of positioning ribs 16 are provided inside the casing cover 11 and the outer periphery of the gas delivery pipe 12 . In addition, a joint 17 is formed at a position corresponding to the exhaust hole 14 , and the joint 17 is formed at the side of the case cover 11 . In addition, a bearing seat 18 is provided at the bottom of the case cover 11 .

The actuator 20 is fixed in the housing cover 11, and it can be an electric cylinder, a pneumatic cylinder or other actuating elements, the present embodiment is a pneumatic cylinder, which is locked on the aforementioned bearing by means of screw-fastening elements such as screws. On the seat 18 , the actuator 20 has a transmission shaft 21 and a driving gear 22 fixed on the transmission shaft 21 .

The cutter structure 30 is disposed above the actuator 20 and formed in the inner space of the housing cover 11 . The cutter structure 30 mainly includes a cutter seat 31 , a fixed cutter 32 , a movable cutter 33 , a sector gear 34 and a shaft The seat 35; the knife seat 31 is erected between the aforementioned positioning ribs 16 and is locked above the shaft seat 35 through the screw fixing element.

The fixed knife 32 is locked on the knife seat 31 through the screw fixing element, the shaft seat 35 is locked on the actuator 20 through the screw fixing element, and the movable knife 33 has a shaft 331 and a blade 332 connected to the end of the shaft 331 , the shaft 331 passes through the knife seat 31 and the sector gear 34 in sequence and pivots the shaft seat 35 rotatably, the sector gear 34 is meshed with the drive gear 22 for transmission, and the blade 332 is accommodated in the aforementioned blade accommodating slot 311 and It is formed below the fixed knife 32 and is driven by the drive gear 22 through the sector gear 34 to rotate the shaft 331 and drive the blade 332 to cooperate with the fixed knife 32 to cut.

The suction port 1211 of the suction section 121 is formed at a position below the cutting position between the fixed knife 32 and the blade 332 of the movable knife.

Further, the automatic cutting device for sewing residual thread of the present invention further includes a needle plate seat 40, which is locked on the knife seat 31 through a screw-fastening element and covers the top of the shell cover 11, and the needle plate seat 40 is provided with A fixed knife accommodating groove 41 for accommodating the fixed knife 32 and a notch 42 communicating with the fixed knife accommodating groove 41 are formed at a position just above the aforesaid suction port 1211 .

Please refer to FIG. 5 and FIG. 6 , the automatic cutting device for sewing residual thread of the present invention can be installed on a sewing machine 8. The sewing machine 8 has an arm 81 and a base 82. The automatic cutting device is equipped with It is located at the front end of the base 82, and communicates with the air inlet hole 13 through an air inlet pipe 83. A cable duct 84 is connected with the aforesaid joint 17 and communicated with the aforesaid air outlet hole 14. The sewing machine 8 also includes a pressing tool 85 and other related devices.

Please refer to FIGS. 7 to 10 , during operation, a cloth 9 is placed above the needle plate seat 40 . Sewing the residual thread 92, align the residual thread 92 at the position of the notch 42 (as shown in Figure 7), and after stepping on the operating pedal (not shown in the figure), the pressing tool 85 will move down and press the fabric 9 (as shown in Figure 8) shown), at this time, the actuator 20 has not yet acted, the driving gear 22 and the sector gear 34 maintain the meshing state, and the blade 332 of the movable knife 33 is located in the blade accommodating groove 311 and deviates from the fixed knife 32. (as shown in Figure 9 and Figure 10).

Please continue to refer to FIGS. 11 to 13 , the gas is delivered to the inlet hole 13 through the inlet pipe 83 . After the gas flows through the delivery section 122 , a passive suction channel will be formed inside the suction section 121 , so that the sewing The residual thread 92 is sucked into the suction section 121 from the suction port 1211; the sector gear 34 is driven to rotate through the drive gear 22 of the actuator 20, so that the shaft 331 of the movable knife 33 rotates with the sector gear 34 and drives the blade 332 Together with the fixed knife 32, the sewing residual thread 92 is cut, and the cut sewing residual thread 92 will be discharged from the conveying section 122 along the direction of the wire tube 84, and the uncut sewing residual thread 92 will pass through the pressing tool. 85 dragging the fabric 9 towards the needle plate and the needle bar. At this time, the uncut sewing residual thread 92 will be folded under the fabric 9, and finally the uncut sewing residual thread 92 will be folded under the The thread 92 is fastened under the fabric 9 .

To sum up, the automatic cutting device for sewing residual thread and its gas transmission structure of the present invention can indeed achieve the intended purpose of use, and solve the lack of conventional knowledge, and because it is very novel and progressive, it is completely in line with the invention The requirements for a patent application should be filed in accordance with the Patent Law. Please check and approve the patent in this case to protect the rights of the inventor.

10: Gas transmission structure

11: Shell cover

12: Air pipe

121: Inhalation section

1211: Suction port

122: Conveying section

13: Air intake holes

14: exhaust hole

15: Reinforcing ribs

16: Positioning ribs

17: Connector

18: Bearing seat

20: Actuator

21: Drive shaft

22: Drive gear

30: Cutter structure

31: Knife holder

311: Blade Pocket

32: Fixed Knife

33: Active Knife

331: Shaft

332: Blade

34: Sector gear

35: Axle seat

40: Needle plate seat

41: Fixed knife pocket

42: Notch

8: Sewing machine

81: Arm

82: Base

83: Intake pipe

84: Cable tube

85: Pressing tool

9: Fabric

91: Chain stitch

92: Sewing residual thread

FIG. 1 is a schematic diagram of the separation of the needle board seat and each component structure of the present invention.

Fig. 2 is an exploded view of the automatic shearing device of the present invention.

FIG. 3 is a three-dimensional appearance view of the gas transmission structure of the present invention.

FIG. 4 is a cross-sectional view of the gas transmission structure of the present invention.

Fig. 5 is a schematic diagram showing the application of the automatic cutting device of the present invention to a sewing machine assembly.

FIG. 6 is a combined schematic diagram of another view of the application of the automatic cutting device of the present invention to a sewing machine.

Figures 7 to 13 are sectional views (1) to (7) of the automatic cutting device of the present invention applied to the sewing machine in use.

10: Gas transmission structure

11: Shell cover

20: Actuator

30: Cutter structure

31: Knife holder

311: Blade Pocket

32: Fixed Knife

33: Active Knife

40: Needle plate seat

41: Fixed knife pocket

42: Notch

Claims (10)

A gas delivery structure of an automatic shearing device, comprising a shell cover, a gas delivery pipe is arranged inside the shell cover, the gas delivery pipe comprises a suction section and a delivery section communicating with the suction section, and is opened in the shell cover There is an air inlet hole communicating with the suction section and the conveying section and an exhaust hole communicating with the conveying section, and a suction port is provided at the end of the suction section away from the conveying section. The gas delivery structure of the automatic shearing device according to claim 1, wherein the suction section is a passive suction channel. The gas delivery structure of an automatic shearing device according to claim 1, wherein the shell cover and the gas delivery pipe are integrally formed, and a plurality of reinforcing ribs and a plurality of positioning ribs are provided inside the shell cover and the outer periphery of the gas delivery pipe . The gas delivery structure of the automatic shearing device according to claim 1, wherein a joint is formed at a position corresponding to the exhaust hole, and the joint is formed at the side edge of the shell cover. An automatic cutting device for sewing residual thread, comprising: the gas delivery structure as described in any one of claim 1 to 4; an actuator fixed in the shell cover; and a cutter structure, provided with Above the actuator, the cutter structure includes a knife seat, a fixed knife fixed on the knife seat, and a movable knife driven by the actuator and cooperating with the fixed knife to cut, wherein the suction port It is formed at a position below the cutting position between the fixed knife and the movable knife. The automatic cutting device for sewing residual thread according to claim 5, wherein the cover is provided with a bearing seat, the actuator is fixed on the bearing seat, the actuator has a transmission shaft and is fixed on the bearing seat A drive gear of the transmission shaft, the cutter structure also includes a sector gear, the sector gear train is connected to the movable cutter and is meshed with the drive gear for transmission. The automatic cutting device for sewing residual thread according to claim 6, wherein the cutter structure further comprises a shaft seat, the shaft seat is fixed on the actuator, inside the shell cover and the outer circumference of the air pipe The edge is provided with a plurality of positioning ribs, and the tool seat is spanned between the positioning ribs and fixed above the shaft seat. The automatic cutting device for sewing residual thread according to claim 7, wherein the movable cutter has a shaft and a blade connected to the shaft, the shaft passes through the knife seat and the sector gear in sequence and can be The shaft seat is pivotally connected, the knife seat is provided with a blade accommodating groove, and the blade is accommodated in the blade accommodating groove. The automatic cutting device for sewing residual thread according to claim 5, further comprising a needle board seat, which is fixed on the knife seat and covers the upper part of the shell cover. The automatic cutting device for sewing residual thread according to claim 9, wherein the needle board seat is provided with a fixed knife accommodating groove for accommodating the fixed knife and a notch communicating with the fixed knife accommodating groove, the A notch is formed above the suction port.

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