JPS6371285A - Double ring sewing machine with left knife having plural needles - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention is applicable to bi-fold elastic sewing such as suede pants, pajamas, shorts, briefs, etc., which are sewn using a multi-needle double chain stitch sewing machine, and T-shirts. This invention relates to a device that automatically cuts m-seams while sewing the edges of fabric in the hemming process.

``Conventional technology'' Conventionally, when sewing with a multi-needle double chain stitch sewing machine, when sewing two-fold elastics or sewing hems, the fabric may become uneven, misaligned seams, fuzz, etc. In order to maintain the quality of the product, various steps are required as a pre-process such as manually trimming the edges of the fabric for post-sewing, or manually trimming the edges after sewing to maintain the quality of the sewn product. However, there were some drawbacks in terms of work efficiency.

``Problems that the invention attempts to resolve'' As mentioned above, in conventional machines, sewing machines used for double-fold elastic sewing and hem sewing have a long continuous sewing machine as shown in Figure 3. Since the fabric 32a is above,
If an attempt is made to cut the edge of the lower fabric 32b located below, the upper fabric 32a will also be cut, which is inconvenient, so instead of installing a knife mechanism, work is done to align the edges of the fabric before or after sewing. In addition, when sewing thick fabrics, when the fabric is folded in half, the folded edge of the fabric will be diagonal, and if you align the edges of the sewn fabric in this state, the seam will be cut and the sewn product will be cut. There were problems such as making defective products.

In the present invention, such problems are automatically solved,
The purpose is to prevent the occurrence of defective products without the need to manually trim the edges of the fabric.

"Means for Solving the Problem" In order to achieve the above object, the present invention includes an eccentric shaft that performs an eccentric movement in synchronization with the rotation of the lower shaft, and a rear upper female rod in the eccentric movement part of the eccentric shaft. It fits loosely, transmits the eccentric movement to the front upper female rod with the connecting rod, fixes the shaft of the Rondo ball to the upper knife table via the upper female rod ball, and connects the upper knife fixed to the upper knife table to the upper knife. The problem was solved by using the shaft as a fulcrum and converting it into vertical motion so that the edges of the fabric could be cut at the same time as the YI material.

Embodiments and Effects Reference will now be made in detail to the accompanying drawings, which illustrate an example of the implementation of the present invention.

1 is the lower shaft, which is the sewing machine driving source. 2 is an eccentric shaft, one end of which is configured in an eccentric shape. The eccentric shaft 2 has an eccentric through hole into which the lower shaft is fitted so that the eccentric shaft rotates eccentrically in synchronization with the rotation of the lower shaft 1. 4 is a rear upper female rod, and an eccentric portion at one end of the eccentric shaft 2 is loosely fitted into the through hole 3, and the eccentric rotation of the eccentric shaft 2 is replaced with a back and forth movement. A connecting rod 6 serves to connect the rear upper female rod 4 and the front upper female rod 8 with a nut 7. Reference numeral 7 is a nut for attaching a connecting rod, and 8 is a front upper female rod, into which the upper female rod ball is loosely fitted in a tied manner. Reference numeral 9 denotes an upper female loft ball which converts the back and forth movement from the rear upper female rod 4 into a swinging movement. 10 is the upper knife table, and the through hole 10a
The tip of the upper female shaft 11 is inserted into and fixed with a set screw 12. On the other hand, the through hole 10b is located at the shaft portion 9 of the upper female rod ball 9.
a is inserted and fixed with a set screw 13, and by the swinging movement of the upper knife rod ball 9, the upper knife stand 10 is moved to swing around the upper knife shaft II, and the upper knife 14 is moved up and down.

Reference numeral 14 denotes an upper knife, which is attached to the tip of the upper knife table 10 with a set screw 15, and by the swinging motion of the upper knife table 10, works in cooperation with the lower knife 21 to cut the edge of the fabric on the left side before the needle drop before sewing. death,
The fabric is moved to the seam-shaped bottom position 16 and sewn.

17 is a lower knife table, and the shaft part 17a is the lower knife table bracket 1.
8 and fixed with a set screw 19. Reference numeral 20 denotes a lower knife holder, and the lower knife 21 is fixed together with the lower knife holder 17 to the concave groove 17b of the lower knife holder 17 with a lower knife holder set screw 22. Reference numeral 18 denotes a lower knife stand bracket, which is attached to the sewing machine main body, to which the upper knife stand 10 and lower knife stand 17 are attached. Reference numeral 24 denotes a lower knife table rotation stopper, which is attached to the lower knife table bracket 18 with a set screw 25. The tip 24 of the rotation stopper
a is inserted into the notch 17c of the lower knife table 17 and serves to prevent the lower knife table 17 from rotating.

Reference numeral 11 denotes an upper knife shaft, which is the center fulcrum of the swinging movement of the upper knife table 10. The flat part 11a at the tip thereof is fixed to the upper knife table 10 with a screw 12, and the movement of the lower shaft 1 is directed to the upper knife table 10. Transmits information through rocking motion.

Reference numeral 26 denotes a left stopper collar, and the through hole of the collar is fitted into the upper knife shaft 11 and fixed with a set screw 27 to prevent the upper knife 14 from escaping when cutting thick fabrics or the like. 28
is an upper knife pressure spring which is loosely fitted onto the upper knife shaft 11 and pulls the upper knife table 10 to the right. 29 is the right stopper collar,
It is inserted into the upper knife shaft 11 and fixed with a set screw 27, and the strength of the upper knife pressure spring 28 is adjusted to determine its position. 30 is a throat plate, 31 is a cloth presser, 32 is a fabric, 32a is a top fabric, 32b is a top fabric, 33 is a rubber, and 34 is a needle.

The present invention has the above-mentioned configuration, and includes an eccentric shaft 2 that performs an eccentric movement in synchronization with the rotation of the lower shaft 1, and a rear upper female rod 4 that is loosely fitted into the eccentric movement part, and the eccentric movement is transferred to the front by a connecting rod 6. The transmission is transmitted to the upper female rod 8, and the shaft portion 9a of the Rondo ball 9 is fixed to the upper knife stand 10 via the upper female rod ball 9, and the upper knife 14 fixed to the upper knife stand 10 is moved around the upper knife shaft 11 as a fulcrum. The vertical movement is converted into an up-and-down motion, and the edge of the fabric is automatically cut on the left side before the needle drop in cooperation with the lower knife 21 before sewing.Therefore, there is no need to manually trim the edges of the fabric, and there is no need to cut defective products. It has the effect of preventing the occurrence of.

"Effects of the Invention" The present invention has the above-described structure and operation, and performs work for aligning fabric edges in the pre- or post-process of sewing with a double-fold elastic and hemming, and is also suitable for sewing thick fabrics. In this case, when the fabric is folded in half, the folded edge of the fabric becomes diagonal, and if the sewn fabric is aligned in this state, the seam will be cut and the sewn product will be considered defective. However, in the present invention, an upper scalpel is installed on the left side before the needle drop, and the sewing operation is performed while automatically cutting the edge of the fabric before forming the seam, so there is no manual operation before or after sewing. There is no need to cut the edges of the target fabric, and there are no defects! It is possible to eliminate all 11 products, which has a large effect range.

[Brief explanation of the drawing]

The attached drawings show an example of carrying out the present invention. Fig. 1 is a perspective view of the main part, Fig. 2 is an exploded perspective view, and Fig. 3 shows how the edge of the fabric is cut by the vertical movement of the upper knife and the cooperation of the lower knife. A main part sectional view shows the part to be cut, and 4th M is a perspective view of the fabric cutting part. 1--Lower shaft, 2--Eccentric shaft, 3--Through hole, 4--
・Rear upper female rod, 5-...through hole, 6 series tie rod, 7.
-・Connection rod mounting nut, 8...Front upper female rod, 9-
---Himesurofudo ball, 9a--Axis of upper female rod ball, 10--Upper female table, 10a--Through hole, 10b--
Through hole, 11-・Upper female shaft, 1la-・Plane part, 12
- Set screw, 13 - Set screw, 14 - Upper female, 15
- Set screw, 16 - Seam formation position, 17 - Lower knife stand,
17 a - Through hole, 17 b - Groove section, 17 c - Lower knife stand notch, 18 - Lower knife stand bracket, 1
9 - Set screw, 20 - Lower knife holder, 21 - Lower knife,
22-Lower knife holding screw, 24--lower knife table rotation stopper, 24a--rotation stopper tip, 25-set screw, 26
- Left stopper collar, 26a - Through hole, 27 - Set screw, 28 - Upper female pressure spring, 29 - Right stopper collar, 30 - Throat plate, 31 - Cloth retainer, 32 - Fabric, 33--rubber, 34-needle, 35-fabric cut edge. Applicant Yamato Sewing Machine Manufacturing Co., Ltd. (and 2 others) Figure 1 Figure 3 Figure 4

Claims (1)

[Claims of Claims] 1. A hoe-shaped upper knife is provided on the left side before the needle drops and is moved up and down, and between it and a stationary lower knife, automatically scissors the edge of the double-folded lower fabric. A multi-needle double chain stitch sewing machine with a left knife. 2. Fix the eccentric shaft to the lower shaft of the sewing machine, loosely fit the eccentric shaft to the rear upper female rod, connect the base end of the rear upper female rod to the front upper female rod via a connecting rod, and loosely fit the upper female rod ball. Then, fix the shaft of the upper female rod ball to the upper knife stand, pivot the upper knife stand to the lower knife stand bracket, fix the hoe-shaped upper knife to the tip of the upper knife stand, and attach it to the lower knife stand bracket. A sewing machine with a multi-needle double chain stitch left knife, characterized in that the lower knife table is fixed, and the lower knife is fixed to the lower knife table in opposition to the upper knife.