JPS5854071Y2 - Sewing machine decorative stitch forming device - Google Patents

Description

[Detailed description of the invention] This invention forms a decorative stitch by passing a decorative thread across the needle thread by means of a thread transfer body that reciprocates and intersects the vertical path of the needle above the throat plate. Regarding the decorative stitch forming device of a sewing machine, in particular, the sliding part between the drive shaft that fixes the thread transfer body and swings about its own axis in conjunction with the main shaft of the sewing machine, and the support member that supports it on the machine frame. This is to ensure lubrication and prevent oil leakage to the outside.

Conventionally, for example, Patent Application Publication No. 149441 of 1975
In the sewing machine described in the publication, a plurality of needles 20 arranged in a straight line intersecting the cloth feeding direction are fixed to the lower end of a needle bar 21, and are reciprocated above the needle plate 22 so as to intersect with the movement path of the needles 20. The decorative thread of the thread passing body 23 is continuously passed between the needle threads of the needles at both ends to form a decorative stitch that intersects in the cloth feeding direction. The mechanism for operating 23 was as follows.

That is, the support 24 has its upper end fixed to the machine frame of the sewing machine jaw.
is a support hole 25 that communicates with the inside of the machine frame from above and penetrates vertically.
is formed, and the upper end is connected to the sewing machine main shaft 26 with respect to this support hole 25.
A mounting body 2 that loosely fits the drive shaft 27 which is connected to and locked to prevent it from falling, and supports the thread transfer body 23 at the lower end of the drive shaft 27.
At the same time, a holder 29 is fixed above the holder 29, which is slidably in contact with the lower end surface of the support 24, and is held between the upper end locking part and the support 24 so as not to move up and down, and the drive shaft 27 swings about its own axis in conjunction with the main shaft 26.

Lubricating oil is supplied to the support hole 25 from a lubrication means provided inside the sewing machine to lubricate the sliding part with the drive shaft 27, and an oil ring 30 is provided between the support hole 25 and the drive shaft 27. This prevents the lubricant from falling and prevents the lubricant from leaking outward.

However, lubricating oil cannot be supplied to the sliding part between the lower end surface of the support body 24 and the holding body 28, causing the sliding part to seize or wear out. Lubricating oil was supplied to the sliding parts using a tool, but
Since the supply amount of lubricating oil cannot be kept constant, if there is too much lubricating oil flowing out from the sliding part, it will flow into the holding body 28 and the mounting body 29.
They have disadvantages such as falling on the bed or cloth through the outer circumferential surface of the sewing machine, or adhering to the needle thread etc. through the thread transfer body 23, staining the sewn product and deteriorating the quality of the product.

This invention aims to eliminate the above-mentioned conventional drawbacks.

An embodiment of this invention will be explained with reference to the drawings. The upper end of the support 1 is fixed to the machine frame (not shown) of the sewing machine jaw at the rear of the needle bar (not shown) in the cloth feeding direction, and the support body 1 is passed through the machine frame (not shown) vertically on the axis. A support hole 2 communicating with the inside of the machine frame is provided, and a cylindrical stepped portion 3 communicating with the support hole 2, opening downward, and having a diameter larger than that of the support hole 2 is formed at the lower end.

The drive shaft 4 is rotatably fitted into the support hole 2, and the upper end protrudes inward of the jaw machine frame and is locked to prevent it from falling downward, and is linked to the main shaft (not shown) of the sewing machine so that its axis Connect so that it swings around the center.

The holder 5 has a drive shaft 4 in a through hole 6 that passes vertically on the axis.
is fitted and fixed, rotatably fitted into the hole of the stepped portion 3, and the distal end surface 7a is slidably engaged with the axial end surface 3a of the inner surface of the stepped portion 3, and the drive shaft 4 is moved upwardly. a small diameter portion 7 that prevents movement of the support body 1, and a large diameter portion 8 that opposes the lower end surface of the support 1 at a distance.
and.

An oil seal 10 is fitted between the inner circumferential surface of the lower end of the stepped portion 3 and the outer circumferential surface of the small diameter portion T, and an oil ring 12 is fitted between the inner circumferential surface of the through hole 6 and the outer circumferential surface of the drive shaft 4. .

A mounting body 14 supporting a thread transfer body 13 is fixed to the lower end of the drive shaft 4, and the thread transfer body 13 acts on the needle thread by swinging the drive shaft 4 to form a decorative stitch.

Lubricating oil is supplied to the support hole 2 from a lubrication mechanism (not shown) disposed inside the sewing machine frame.

This invention has the above-described configuration, and when the drive shaft 4 swings in conjunction with the main shaft of the sewing machine, the joints between the drive shaft 4 and the support hole 2, and between the stepped portion 3 and the small diameter portion 7 slide.

The lubricating oil supplied to the support hole 2 of the support body 1 lubricates between the inner peripheral surface of the support hole 2 and the outer peripheral surface of the drive shaft 4, and the lubricating oil is supplied to the support hole 2 of the support body 1.
A portion of the oil also flows between the drive shaft 4 and the through hole 6, and the lubricating oil between the stepped portion 3 and the small diameter portion 7 is blocked by the oil seal 10. The lubricating oil between the drive shaft 4 and the through hole 6 is blocked by the oil ring 12 to prevent it from flowing outward.

As described above, according to this invention, the upper end is fitted into and fixed to the bottom of the jaw of the sewing machine frame, and the support hole that communicates with the inside of the machine frame and passes through it vertically, and the lower end of the support hole that communicates with the lower end of the support hole and extends downward. A support body is formed with a hole that is open and has a larger diameter than the support hole, and a support body that is rotatable about its own axis in conjunction with the main shaft of the sewing machine, and whose upper and lower ends protrude vertically and fit into the support hole, and whose upper end is connected to the support body. A drive shaft supported so as not to fall against the shaft, a holder fitted into the hole and fixed to the drive shaft with its upper end surface slidably in contact with the axial end surface of the hole, and facing away from the lower end surface of the support. The mounting body is fixed to the lower end of the drive shaft and supports the thread transfer body, and is separately arranged between the inner circumferential surface of the lower end of the hole and the outer circumferential surface of the holder, and between the inner circumferential surface of the holder and the outer circumferential surface of the drive shaft. By providing a seal body that seals the space between the sewing machine and the sewing machine, lubricating oil from the lubricating means inside the sewing machine can be supplied to the sliding part between the holding body and the support body, and
The sealing body reliably prevents oil leakage, which prevents the sliding parts from burning and prevents lubricant from adhering to sewn products and needle threads, which has the effect of improving product quality. .

[Brief explanation of drawings]

FIG. 1 is a front longitudinal sectional view of the head of a multi-needle sewing machine, FIG. 2 is a longitudinal sectional view of a conventional drive section, and FIG. 3 is a longitudinal sectional view of the drive section of this embodiment. In the figure, 1 is a support body, 2 is a support hole, 3 is a hole, 4 is a drive shaft, 5 is a holder, 13 is a thread passing body, 14 is a mounting body, 1
0.12 is a seal body.

Claims (1)

[Scope of utility model registration request] A support hole whose upper end is fitted and fixed into the bottom of the jaw of the sewing machine frame and which communicates with the inside of the machine frame and penetrates vertically; and a hole which communicates with the lower end of the support hole and opens downward and has a diameter larger than that of the support hole. A drive shaft that is rotatable about its own axis in conjunction with the main shaft of the sewing machine, and that is fitted into a support hole with its vertical movement protruding upward and downward, and is supported so that its upper end does not fall against the support. ,
A holder whose upper end surface is slidably in contact with the axial end surface of the hole and which is fitted into the hole and fixed to the drive shaft, and a holder which is spaced apart from the lower end surface of the support and is fixed to the lower end of the drive shaft to support the thread passing body. A sewing machine equipped with a mounting body, and a sealing body arranged separately between the inner circumferential surface of the lower end of the hole and the outer circumferential surface of the holder and between the inner circumferential surface of the holder and the outer circumferential surface of the drive shaft to seal the space between them. Decorative stitch forming device.