JPH0148793B2 - - Google Patents

Description

Detailed Description of the Invention "Industrial Application Field" The present invention is applied to the remaining portion of reinforcing tape that is sewn into the base seam to prevent seams from fraying (cracks), etc. in the sewing process of sewn products such as knits and stockinette. The present invention relates to a bar tack sewing method and an automatic reinforcing tape cutting method and an apparatus for easily bar tack sewing the reinforcing tape and the sewing thread end, and then automatically cutting the remaining part of the reinforcing tape and the sewing thread end.

``Prior art'' Conventionally, the method for bar tacking and cutting reinforcing tape was to manually fold the remaining part of the reinforcing tape and the end of the sewing thread along the seam from the seam, and insert it under the presser foot while holding it down. Then, the bartack is sewn using a bartack sewing machine, and then, as a separate operation, the remainder of the reinforcing tape and the end of the sewing thread are cut manually using scissors or the like.

``Problems to be Solved by the Invention'' In the conventional bar tack sewing and subsequent reinforcing tape cutting method, the remaining part of the reinforcing tape and the end of the sewing thread are folded back and held down under the presser foot of the bar tack sewing machine. Since the reinforcing tape is inserted into the reinforcing tape and bartacked, the sewing work itself is troublesome, and after bartacking, as a separate operation, the bartacked parts of the sewn product are searched and the remaining reinforcing tape is removed one by one with scissors or the like. In addition, since the end of the sewing thread is cut, the cutting work is increased in addition to the bar tacking work, resulting in poor work efficiency and the need for an extra worker to perform the cutting work.
There are problems such as high cost.

"Means for Solving the Problems" The present invention has been devised to solve the above-mentioned problems, and the means thereof will be explained below using embodiments and the accompanying drawings corresponding to the embodiments.

At the tip of the throat plate 2 of the bar tack sewing machine 1, a cutter mount 3 is attached, which has a vacuum suction groove 4 in the center that communicates the tip with a vacuum suction tube 5, and is used to cut sewing products such as knitwear or stockinette. When the bar stitching part is inserted under the presser foot 6 of the sewing machine 1, the remaining part of the reinforcing tape and the sewing thread end 7 are sucked into the vacuum suction groove 4, and the fixed knife 8 is placed on the cutter mount 3 with the cutting edge of the knife 8. is located above the vacuum suction groove 4, a movable knife 9 is provided that slides on and engages the fixed knife 8, the movable knife 9 is connected to a knife drive device 10, and the cutter mounting base is A fabric detecting device 11 is installed at the tip of the throat plate 2 of the attached section of No. When the presser foot 6 is detected to be inserted under the presser foot 6, the bar tacking sewing machine 1 is activated, and when the presser foot 6 is raised and the extraction of the bar stitched portion is detected, the movable knife 9 is activated by the knife drive device 10, and the vacuum suction is performed. The movable scalpel 9 meshes with the fixed knife 8 to cut the remaining reinforcing tape and the thread end 7 sucked into the groove 4, and the cut reinforcing tape remainder and the thread end 7 are removed from the vacuum suction tube 5 through the suction pipe 12. The air is sucked into the vacuum mobox 13 through the vacuum pump.

"Function" When the bar-stitched part of a sewn product such as knitwear or stockinette is placed on the throat plate 2 of the bar-tacking sewing machine 1, the remaining part of the reinforcing tape and the sewing thread end 7 of the bar-stitched part are sucked into the vacuum suction groove 4, and the reinforcing tape The remaining part of the seam and the sewing thread end 7 are folded along the seam from the edge of the seam,
It can be inserted directly under presser foot 6 of sewing machine 1,
The material detection device 11 detects this insertion, and the sewing machine 1 performs bartack sewing, and when the bartacked portion is pulled out from the presser foot 6 after the bartacking is completed, the material detection device 11 detects this removal, and the movable knife 9 meshes with the stationary knife 8 to automatically cut off the remainder of the reinforcing tape and the end 7 of the suture thread.

``Example'' Reference will now be made in detail to the accompanying drawings that illustrate an example of implementing the present invention.

Reference numeral 1 denotes a known bar tack sewing machine, which performs bar tack sewing on areas of sewn products such as knitwear or stockinette that are likely to fray (crack). 2 is a needle plate of the bar tack sewing machine, and 3 is a cutter mounting base attached to the tip of the needle plate 2. Reference numeral 4 denotes a vacuum suction groove bored in the center of the cutter mounting plate 3, the base end of which is open in the direction of the presser foot 6, and the distal end of which passes through the cutter mounting plate 3 and allows the vacuum suction tube 5 to be directed downward. They are prominently placed in series.
Reference numeral 7 denotes the remaining reinforcing tape and sewing thread end of the fabric 7a in the base seam part, which are the reinforcing tape and sewing thread sewn into the base seam part to prevent fraying (cracks), etc. in the sewing process of sewn products such as knitwear or stockinette. This is the unnecessary part that is discarded. Reference numeral 8 denotes a fixed scalpel, and a second knife is attached to the upper surface of the base of the cutter mount 3 so that the cutting edge 8a is located above the vacuum suction groove 4 of the cutter mount 3.
As shown in the figure, it is fixed with a fixed female set screw 14. Reference numeral 9 denotes a movable scalpel, which is arranged to slide on the fixed knife 8, with a cutting edge 9a meshing with the cutting edge 8a of the fixed knife 8 above the vacuum suction groove 4, and a movable scalpel 9 on the lower surface of the movable knife 9. A movable knife operation arm 17 is provided, which has a pin 15 drilled therein, and a groove 16 at its tip into which the pin 15 is inserted.
5 and overlap the movable knife operating arm 17 on the lower surface of the movable knife 9, and connect the base of the operating arm 17 to the fulcrum pin 1.
The cutter 20 is rotatably supported on the upper surface of the distal end of the cutter mount 3 at 8, and has a lever attachment arm 19 protruding from the side surface of the operating arm 17. Reference numeral 10 denotes a knife drive device, a knife operating lever 21 is fixed to the mounting arm 19, and an air cylinder installed at the other end of the knife operating lever 21 is connected to an air cylinder mounting base 22a fixed to the sewing machine main body 1a of the bar tacking sewing machine 1. The tip of the piston rod 23 of the cylinder 22 is rotatably supported by a pin 24, and the knife actuating lever 2 is moved by moving the piston rod 23 back and forth in the air cylinder 22.
1 and the operating lever mounting arm 19, the movable knife operating arm 17 is given a swinging motion about the fulcrum pin 18, and the swinging motion of the operating arm 17 causes the pin 15 inserted into the groove 16 to move. The movable knife 9 is swung relative to the fixed knife 8 through the movable knife 9. Although the air cylinder 22 is used here as the knife drive device 10, other suitable devices such as a solenoid can be used. Reference numeral 11 denotes a fabric detection device, which is composed of a light receiving device 25 embedded in a section attached to the cutter mount 3 at the tip of the throat plate 2, and a light emitting device 26 such as a phototube installed above the light receiving device 25. The driving part of the bar tack sewing machine 1 and the control part of the solenoid valve etc. of the knife driving device 10 are connected, and the bar tack part of the sewn product such as knitwear or stockinette is inserted under the presser foot 6 of the sewing machine 1 and the control part of the knife drive device 10 is connected. It detects removal from below.
When the insertion is detected, the drive section of the bar tacking sewing machine 1 is operated to perform bar tacking of the bar tacking section, and when the withdrawal is detected, the piston rod 23 of the air cylinder 22 is moved backward, and the movable knife 9 is moved back to the fixed knife. This device is designed to cut the remaining reinforcing tape and the sewing thread end 7 of the bart stitched part that is engaged with the tape 8 and sucked into the vacuum suction groove 4. Reference numeral 12 denotes a suction pipe, one end of which is connected to the downward protrusion of the vacuum suction tube 5. 13 is a vacuum box, vacuum pump 27
and a chip accommodating part 28 for accommodating the remainder of the cut reinforcing tape and the sewing thread end 7. The swarf accommodating part 28 and the other end of the suction pipe 12 are connected. are connected via a filter or the like (not shown). Reference numeral 29 denotes a holding plate for the movable scalpel 9, which covers the entire upper surface of the cutter mount 3 and is fixed to the cutter mount 3 with appropriate setscrews 30, 30.
Reference numerals 31 and 31 denote pressure rulers, which are fixed to both sides of the presser foot 6. When the bar stitching section is inserted under the presser foot 6, when the edge of the fabric comes into contact with the rulers 31, 31, the bar stitching section is fixed. The bar tack sewing area is located at a position suitable for sewing with the bar tack sewing machine 1.

"Effects of the Invention" Since the present invention has the above-described configuration, when bar-tack sewing is performed on the base-stitched part of knitwear, stockinette, etc., when the bar-tacked part of the fabric 7a is inserted under the presser foot 6, the base-stitched part of the fabric 7a is The remaining part of the reinforcing tape and the sewing thread end 7 at the sewing part are sucked into the vacuum suction groove 4 and folded along the seam from the seam edge, so there is no need to insert it while holding it by hand as in the past. The material detection device 1 detects the insertion of the bar-stitching part under the presser foot 6.
1, the bar tack sewing machine 1 is activated to perform bar tack sewing on the bar stitched portion, thereby facilitating bar tack sewing. Furthermore, after bar tack sewing is completed, when the presser foot 6 is raised and the bar-stitched part is pulled out from under the presser foot 6, the material detection device 11 detects this withdrawal, and the piston rod 23 of the air cylinder 22 is moved back, allowing the presser foot 6 to move. Since the knife 9 is engaged with the fixed knife 8 and the remaining part of the reinforcing tape and the sewing thread end 7 are automatically cut, there is no need to cut them as a separate operation after bar tacking as in the conventional method. Work efficiency can be doubled.

Furthermore, as described above, the present invention operates the bar tacking sewing machine 1 and the knife drive device 10 using the fabric detection device 11, so that stepping operations can be omitted, and even physically disabled people with limited mobility can easily operate the sewing machine. It can be omitted and can be operated satisfactorily even by physically handicapped people.

Further, if the cutter 20 of the present invention is similarly attached to a sewing machine other than the bar tacking sewing machine 1, it can also be used for cutting empty ring remaining threads, etc.

[Brief explanation of drawings]

The attached drawings show an example of the implementation of the present invention, and FIG. 1 is a schematic front view of the main parts of the whole, FIG. 2 is a plan view schematically showing the knife drive unit with the movable knife holding plate omitted, and FIG. 3 FIG. 4 is a partially cross-sectional schematic front view of the main part of the knife drive unit, and FIG. 4 is a partially cross-sectional side view of the cutting device. DESCRIPTION OF SYMBOLS 1... Bar tack sewing machine, 1a... Sewing machine main body, 2... Throat plate, 3... Cutting device mounting base, 4... Vacuum suction groove, 5... Vacuum suction tube, 6... Presser foot, 7... Remaining part of reinforcing tape and sewing thread end, 7a ... Dough, 8... Fixed knife, 8a... Blade tip, 9... Movable knife, 9a... Blade tip, 10... Knife drive device, 11... Fabric detection device, 12... Suction pipe,
13...Vacuum box, 14...Fixed female set screw,
15... Pin, 16... Groove, 17... Movable knife operating arm,
18... Fulcrum pin, 19... Lever mounting arm, 20... Cutting device, 21... Knife operating lever, 22... Air cylinder, 22a... Air cylinder mounting base, 23
...Piston rod, 24...Pin, 25...Light receiving device, 26...Light emitting device, 27...Vacuum pump, 28...
Chip storage section, 29...Movable knife holding plate, 30...Set screw, 31...Applying ruler.

Claims (1)

[Claims] 1. When the bar-stitched part of a sewn product such as knitwear or stockinette is inserted under the presser foot of a bar-tack sewing machine, the remaining part of the reinforcing tape sewn into the base-stitched part and the end of the sewing thread are grasped, and the fabric detection device detects the insertion of the bar-stitched part and operates the bar-tacking sewing machine, and when the bar-tack part is pulled out from under the presser foot after the bar-stitching is completed, the material detection device detects the withdrawal of the bar-stitched part and at the same time, the reinforcement is tightened by the scalpel. A bar tack sewing and reinforcing tape automatic cutting method characterized by cutting the remaining part of the tape and the end of the sewing thread. 2. Attach a cutter mount to the tip of the needle plate of a bar tack sewing machine, drill a vacuum suction groove in the center of the mount, connect a vacuum suction tube to the tip of the groove, and insert suction into the vacuum suction tube. A vacuum box is connected through a pipe, a fixed scalpel is attached to the cutter mounting base so that the cutting edge is located above the vacuum suction groove, and a movable knife connected to a knife drive device that meshes with the fixed knife and slides. A knife is installed as a cutting device, a material detection device is provided at the tip of the throat plate, and the material detection device is connected to the bar tack sewing machine drive unit and the knife drive device, and the bar tack portion of the sewn product is cut by the bar tack sewing machine. When inserted under the presser foot, the material detection device activates the bar tacking sewing machine to perform bar tacking sewing, and when the bartitch portion is pulled out from under the presser foot after the bar tacking is completed, the material sensing device activates the knife drive device. A bar tack sewing and reinforcing tape automatic cutting device characterized in that a movable knife is engaged with a fixed knife to cut the remaining part of the reinforcing tape and the end of the sewing thread.