JP2001347088A - Attachment for rolled hemming of setting machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an attachment for rolled hemming enabling the stable sewing of a corner part with out requiring a sophisticated sewing technique in an over-edge chain stitching sewing machine. SOLUTION: The over-edge chain stitching sewing machine has a presser for a cloth cutter disposed on eth presser foot side and the attachment for rolled hemming mounted ahead of the cloth cutter in the cloth sending direction. The over-edge chain stitching sewing machine also has an auxiliary plate with a pressing part for pressing a cloth. The base part of the auxiliary plate is fixed to the presser foot, and the pressing part, extending to a position adjacent to the attachment for rolled hemming, is formed at the top of the auxiliary plate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an overlock sewing machine and the like, in which the end of a cloth is cut with a scalpel, and the cut end of the cloth is overturned with an overlock stitch such as a lock stitch while turning over the cut end of the cloth. It is about attachments.

[0002]

2. Description of the Related Art The prior art will be described below with reference to FIGS.

FIG. 4 is a perspective view. Reference numeral 1 denotes a shaft provided at the tip of a holding arm, not shown, which can be vertically moved and can be opened and closed about a vertical axis. The upper end of the support 2 is fixed by screws 3. Further, a cloth presser 5 is rotatably supported by a pin 4 at the tip of the support 2. Reference numeral 6 denotes a moving knife as a cloth cutting device which moves up and down in conjunction with the sewing machine mechanism, and cooperates with a fixed knife 7 to cut the end of the cloth.

Reference numeral 8 denotes a wrapper (feller) as a hem-wound attachment, which is disposed further forward than the moving knife 6 in the cloth feeding direction. The wrapper 8 is attached to the tip of a support plate 9 whose lower surface is bent in a crank shape. The base of the support plate 9 is fixed, and an adjustment plate 11 having a horizontally elongated hole 10 formed therein.
Is fixed to the left end by two screws 12 and 13.
The right end of the adjustment plate 11 is fixed to a piece 14 fixed to a sewing machine frame (not shown) by a screw 15.

Reference numeral 16 denotes a sewing machine needle.

The wrapper 8 is folded in two by cutting the cloth end by the moving knife 6 while the cloth W is fed by the cloth feed mechanism, and passing the cut cloth end through the wrapper 8. At the same time, the folded cloth edge is overlock-stitched by the overlock stitch by cooperation of the needle 16 that moves up and down, the lower looper and the upper looper (not shown).

[0007]

However, in this overlock sewing, the specification of the linear sewing in which the cloth W is fed straight in the cloth feed direction as shown in FIG. 6 and the overlock of the corner portion as shown in FIG. There are sewing specifications. There is no particular problem in the case of the straight stitch specification, but the following problem occurs in the case of the corner corner specification.

That is, as shown in FIG. 8, at this corner, the distance A from the center of the arc to the sewing position where the needle 16 moves up and down, the distance B to the folding position, and the cloth W
And the distance C to the cut end is different, so that the circumference becomes longer toward the outside.

When overcasting the corners, it is necessary to feed the cloth W at the cut end portion of the long cloth W more than the cloth feed amount of the inner part sent by the cloth feed mechanism. Also, the cut end of the cloth W cut by the moving knife 6 shown in FIG. 5 tends to escape further inward from the inside of the right end of the wrapper 8.

[0010] For this reason, the operator performs an operation of pushing the cloth W at the cut end into the wrapper 8 by tweezers or the like by a greater amount than the cloth feed mechanism while performing overlock stitching. The user operates the cloth W so that the cut end of the cloth W cut by the moving knife 6 is always in contact with the inside of the right end of the wrapper 8 by holding the cut piece 17 of the cut cloth W as shown and pulling the cut piece 17 downward and to the right.

As a result, as shown in FIG. 7, the overturned portion of the corner portion is overlock-stitched in a state where it is inserted.

As described above, the conventional overlock stitching at the corner portion requires a high level of sewing technology of a sewing manufacturer, and it takes a long time to learn the sewing technology, and the sewing operation is performed with the sense of the sewing manufacturer. Therefore, there is a problem that the quality of the sewn product varies due to a difference in the sewing technique of the sewn manufacturer, a sewn product with stable quality cannot be obtained, and the commercial value of the sewn product is reduced.

[0013]

According to the first aspect of the present invention,
In an overlock sewing machine provided with a cloth presser, a cloth cutting device arranged on the side of the cloth presser, and a hem-wound attachment provided in the cloth feed direction ahead of the cloth cutting device, the base is fixed to the cloth presser, and An auxiliary plate is provided which extends from the side of the cloth cutting device to a position close to the hem-wound attachment and has a pressing portion for pressing the cloth end.

According to the first aspect of the present invention, the provision of the auxiliary plate having a very simple structure eliminates the necessity of a high-level sewing technique of a sewing manufacturer for overcasting at a corner of a corner. In addition to the above, there is no need to learn the sewn product, the quality of the sewn product is stable, a sewn product with high commercial value is always obtained, and effects such as low cost and excellent economic efficiency are obtained.

According to a second aspect of the present invention, the fixing position of the auxiliary plate to the presser foot can be adjusted in a direction crossing the cloth feeding direction.

According to the second aspect of the invention, in addition to the effects described in the first aspect, it is possible to cope with a change in the overlock width and various exchanges of the hem winding attachment, and the effect of being excellent in versatility is obtained. .

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described.
This will be described with reference to FIGS.

The description of the components having the same configuration as that of the prior art will be omitted, and only the configuration characteristic of the present invention will be described. The same components will be given the same part names and reference numerals as those of the prior art. Will be explained.

Reference numeral 20 denotes an auxiliary plate which has a long hole 22 formed in a base 21 thereof in a direction crossing the cloth feeding direction, and is fixed to the upper surface of the cloth presser 5 by a screw 23 through the long hole 22. The distal end of the auxiliary plate 20 is bent downward at a right angle as shown in FIG. 1 to form a pressing portion 24 having a boat-shaped side surface. The pressing portion 24 is located on the side of the moving knife 6 as a cloth cutting device as shown in FIG. 2, and the lower end surface thereof is slightly higher than the lower surface of the cloth presser 5 as shown in FIG. Extends near the insertion opening of the wrapper 8 as a hem sewing attachment.

The configuration of the present invention is as described above. Next, the operation will be described.

First, the presser foot 5 is raised, the cloth W is inserted into the lower surface thereof, and then the presser foot 5 is lowered.

When the sewing machine is driven from this state, the cloth W is fed in the cloth feeding direction by the cloth feeding mechanism, and the moving knife 6 as a cloth cutting mechanism moves up and down to cooperate with the fixed knife 7 to move the cloth W as shown in FIG. As shown, the cloth edge of the cloth W is cut. Further, the cloth W is fed in the cloth feeding direction by the cloth feeding mechanism, and the cloth end is introduced into the insertion opening of the wrapper 8. As shown in FIG. 3, the cloth edge of the cloth W sent as described above is pressed from the side of the portion cut by the moving knife 6 to a position close to the insertion opening of the wrapper 8 as shown in FIG. Needle plate 2 by the lower surface of portion 24
5 and is not moved to the left due to sliding resistance. In this state, the cloth is further fed, and the cloth end is gradually folded in two by the wrapper 8, and the folded cloth end is shown in FIG. 6 by the needle 16 which moves up and down, the upper looper and the lower looper not shown. It is overlocked.

Also, when turning the cloth W to bend the corners of the cloth W shown in FIG. 7, the cloth end of the cloth W is placed on the wrapper 8 from the side of the portion cut by the moving knife 6. The auxiliary plate 2 as shown in FIG.
Since the lower surface of the pressing portion 24 is pressed against the upper surface of the needle plate 25 to provide sliding resistance, the cloth edge is not moved to the left, and the cloth edge securely contacts the inner end surface of the wrapper 8. It is fed into the wrapper 8 while maintaining the state, and the overlock sewing is performed in a state where the insertion is uniformly performed.

When it is necessary to change the position of the pressing portion 24 of the auxiliary plate 20, for example, when changing the overlock width or replacing the hem-wound attachment, the screw 23 is used.
The auxiliary plate 20 is moved to the right or left along the long hole 22 in the direction crossing the cloth feeding direction, the pressing part 24 is set at an appropriate position, and the screw 23 is tightened to adjust the fixing position to the cloth presser.

[0025]

As described above, according to the present invention, by providing an auxiliary plate having a very simple structure to the presser foot, the advanced sewing technique of a sewing manufacturer is not required for overcasting at a corner of a corner. It is not necessary to learn sewing technology, and it is possible to obtain sewing products that are stable in quality and always high in commercial value.
Further, since the fixing position of the auxiliary plate with respect to the cloth presser can be adjusted in a direction crossing the cloth feeding direction, it is possible to cope with a change in the overlock width and various exchanges of the hem-wound attachment, and the effect of being excellent in versatility can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view of the present invention.

FIG. 2 is a partial plan view of the present invention.

FIG. 3 is a sectional view taken along line DD of FIG. 2;

FIG. 4 is a perspective view of a conventional technique.

FIG. 5 is a partial plan view of the prior art.

FIG. 6 is an explanatory diagram illustrating specifications of straight stitching in which the cloth W is fed straight in the cloth feeding direction.

FIG. 7 is an explanatory diagram for explaining specifications of an overlock stitch at a corner portion.

FIG. 8 is an explanatory diagram for explaining a difference in feed amount of each part at a corner portion.

[Explanation of symbols]

 5 Cloth holder 6 Moving knife (cloth cutting mechanism) 7 Fixed knife (cloth cutting mechanism) 8 Wrapper (hem winding attachment) 16 Needle 20 Auxiliary plate 22 Long hole 24 Pressing part W Cloth

Claims (2)

[Claims] 1. An overlock sewing machine comprising a presser foot, a cloth cutting device arranged on the side of the presser foot, and a hem-winding attachment provided further forward in the cloth feed direction than the cloth cutting device. A hem-winding attachment for a sewing machine, wherein an auxiliary plate is provided which is fixed and has a pressing portion which extends from a side of the cloth cutting device to a position close to the hem-winding attachment and forms a pressing portion for pressing a cloth end. 2. A hem winding attachment for a sewing machine according to claim 1, wherein the fixing position of the auxiliary plate with respect to the cloth presser can be adjusted in a direction crossing the cloth feeding direction.