JPH0314141Y2 - - Google Patents

Description

[Detailed description of the invention] "Industrial application field" This invention provides a device that can automatically and accurately determine the sewing start position of the fabric to be sewn when performing back-to-back stitching with an overlock sewing machine. It is something to do.

``Conventional technology〓 Conventionally, overlock sewing machines perform sewing while cutting the edge of the fabric, and in this case, the upper knife is used as a reference to determine the sewing position of the fabric.
In the case of matsui stitching, etc., it is not necessary to cut the edge of the fabric again, and it is therefore difficult to position the fabric at the sewing position using the upper knife standard. There is no other choice but to determine the position of the edge of the fabric.

``Problem that the invention aims to solve'' When determining the sewing start position based on intuition and experience as in the past, when the position of the fabric changes,
There may be loose threads left on the front of the fabric,
This method has the disadvantage that the front edge of the fabric becomes curled, significantly degrading the quality of the sewn product and producing defective products. The purpose of this project is to replace the conventional manual positioning based on intuition and experience with automatic positioning, eliminate this kind of drawback, and provide a device that can improve the efficiency of this kind of work. It is.

"Means for Solving the Problem" In this proposal to achieve the above object, a fabric leading edge positioning plate and a fabric right edge guide plate are provided to accurately and automatically move the fabric edge to the sewing starting position without depending on the hand. This allows the decision to be made.

``Embodiments and Effects'' Now, detailed description will be given of the accompanying drawings showing an example of the present embodiments.

Reference numeral 1 denotes a fabric tip positioning plate, which is installed in front of the needle droplet 23 of the throat plate 4 so as to be able to move forward and backward. The tip positioning plate 1 moves to the left in the direction of arrow A to determine the sewing start position. Reference numeral 2 denotes a right edge guide plate for the fabric, which is installed on the throat plate 4 and functions to correctly guide the fabric in the direction of fabric movement to prevent the fabric from meandering as it advances, as well as to isolate the upper knife from the right edge of the fabric. It also serves as 3 is a known cross plate, 4 is a throat plate, 5 is a sewing machine needle, 6 is an upper knife which moves the right end of the fabric up and down in synchronization with the up and down movement of the sewing machine needle 5;
In the case of normal overlock stitching, the right edge of the fabric is cut in cooperation with 7. However, in the case of the present invention, the right edge of the fabric is not cut because it is sewn with a matsui stitch. Reference numeral 7 denotes a suction pipe which sucks in the empty ring by the suction action of air. Reference numeral 8 denotes an empty ring holding cylinder mounting base on which the empty ring suction pipe 7 and the empty ring holding cylinder 9 are mounted. Reference numeral 10 denotes a connecting shaft, on one side of which the fabric tip positioning plate 1 is fixed with a fixing screw 11, and on the other side loosely fitted into a cylinder mounting base 12; The tip positioning plate 1 is moved leftward and rightward. Reference numeral 12 denotes a cylinder mounting base, on which the cylinder 13 is mounted. The cylinder 1
Reference numeral 3 controls movement of the fabric tip positioning plate 1 and the connecting shaft 10 to the left and to the right. 14 is a mounting plate for attaching a cylinder mounting base, 15 is a front cover, 16 is a sewing machine body, 17
is a lower knife which works together with the upper knife 6 to cut the right edge of the fabric in the case of normal overlock stitching, but in the present invention, the right edge of the fabric is not cut due to the matsui sewing. 18 is a screw that fixes the fabric right end guide plate, 19 is a bearing, and connecting shaft 1
0 is a bearing for the slide shaft 21, and 20 is a connecting plate which allows the action of the cylinder 13 to move the connecting shaft 10 forward and backward to the left and back through the cylinder shaft 22. The slide shaft 21 is a base shaft for moving the cloth tip positioning plate 1 and the connecting shaft 10 back and forth to the left and right. 23 is the needle drop,
At the position where the seam is formed, a lower feed dog 24 feeds the sewing fabric in cooperation with a cloth presser (not shown). The present invention has the above-mentioned configuration, and when using this, when the foot pedal is depressed, the cloth presser is raised by the action of the known presser lifting mechanism, and at the same time, the cylinder 13 starts working, and the cloth tip positioning plate 1 is moved to the left in the direction of arrow A via the connecting shaft 10 to a preset position on the upper surface of the throat plate 4. In this case, since the fabric tip positioning plate 1 moves horizontally from side to side, it can be stopped at any position, and its position can be arbitrarily adjusted depending on the condition of the fabric. Also, while continuing to depress the foot pedal, the front end of the dough touches the fabric leading edge positioning plate 1 that has been moved to the left, and the right edge of the fabric contacts the fabric right edge guide plate 2, and when the foot pedal is released, the fabric leading edge positioning plate 1 moves back to the right in the direction of arrow B, and at the same time the fabric presser lowers, and when the foot pedal is depressed, the sewing machine starts rotating and back-touch sewing begins.

``Effect of the invention'' The present invention has the above-mentioned configuration, and the operator can adjust and position them at any desired position by installing a fabric leading edge positioning plate and a fabric right edge guide plate, and then simply by touching the fabric, the sewing start position can be reliably set. can be established in
The texture of back-to-back stitching is stable, and positioning, which requires manual determination of the sewing start position, does not require time, sense, or experience, increases efficiency, and prevents deterioration in the quality of sewn products and the occurrence of defective products. This has been made possible easily and at low cost, and its effects are truly great.

[Brief explanation of the drawing]

The attached drawings show an example of the implementation of the present invention. Fig. 1 is a perspective view of the entire invention, and Fig. 2 shows how the fabric tip positioning plate is moved to a preset position on the throat plate in order to position the fabric tip. FIG. 3 is a plan view showing a state in which the fabric tip positioning plate is moved to the left, and FIG. 1... Fabric tip positioning plate, 2... Fabric right end guide plate, 3... Cross plate, 4... Throat plate, 5
... Sewing machine needle, 6 ... Upper knife, 7 ... Empty ring suction pipe, 8 ... Empty ring holding cylinder mounting base, 9 ...
Empty ring holding cylinder, 10...Connection shaft, 11...Fixing screw, 12...Cylinder mounting base, 13...Cylinder, 14...Mounting plate, 15...Front cover, 16
... Sewing machine body, 17 ... Lower knife, 18 ... Screw, 19 ... Bearing, 20 ... Connection plate, 21
...Slide axis, 22...Cylinder axis, 23...
Needle entry, 24...lower feed dog, 25...fabric.

Claims (1)

[Scope of utility model registration request] In backtuck sewing, in which the free loop remaining thread cut from the previously sewn fabric of a sewn product to be sewn with an overedge sewing machine is sewn into the sewing start seam of the next sewn fabric, the connecting plate 20 is connected to the cylinder shaft 22. , a fabric leading edge positioning plate 1 connected via a connecting shaft 10 is provided on the throat plate 4 in front of the seam forming position so as to be movable left and right, and a fabric right edge guide plate 2 is provided on the throat plate 4. A device for determining the position of the fabric edge at the start of sewing on an overlock sewing machine.