JPS609470B2 - Cloth guide mechanism of sewing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cloth guide mechanism for a sewing machine for hemming the outer periphery of a cylindrical piece of cloth or for stitching together pieces to be sewn together.

Conventionally, this type of cloth guiding mechanism has been fixedly placed in front of the presser foot in the cloth feeding direction, and has been used, for example, when folding and sewing the edges of cloth. When sewing, the first seam returns to the original seam, so the first seam gets caught in the fabric guide mechanism before the sewing is finished, which prevents the fabric from feeding the circular garment. There was a drawback that the sewing was not completed completely.

For this reason, in the past, the sewing machine was stopped a little before the first seam caught on the fabric guide mechanism, the fabric was removed from the fabric guide mechanism, and the fabric was guided by hand and fed into the seam section to complete the stitching. Therefore, work efficiency is greatly reduced, and the operator must always be careful to prevent the first seam from getting caught in the fabric guide mechanism and causing the seam to fray. This has the disadvantage of increasing work fatigue. The present invention was made in view of these conventional drawbacks, and its purpose is to provide a sewing machine that overlaps and integrates pieces to be sewn around the outer periphery of a cloth to be sewn into a cylinder.
To provide a cloth guide mechanism for a sewing machine that eliminates the above-mentioned drawbacks by automatically releasing the cloth guide mechanism from the seam part when sewing the final stitch.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

In the figure, reference numeral 1 denotes a known presser foot, which is moved up and down in conjunction with a knee raiser (not shown). 2 is presser foot 1
A fixed base 4 on the pet surface 3 on the front side of the sewing machine is sewn so as to guide the circumferential edge of the fabric W and one circumferential edge of the folded piece W as the piece to be sewn in parallel to the fabric feeding direction Y. A regulation plate fixed to the upper surface of the pet at a distance in a direction horizontally intersecting the line of sight n, 5
is a guide plate located in front of the presser foot 1 in the cloth feeding direction, and has a guide portion 6 formed in a U-shape parallel to the cloth feeding direction and away from the upper surface of the pet and away from the regulating plate. The pet face 3 is inserted through bearings 7 and 8 fixed on the top and is movable by a rod 9 so that the tip of the guide part 6 intersects with the path of the seam line n or retreats between the cloth W and the folded piece W. It is supported above.

In this embodiment, a guide section 10 for a rubber string G is further formed integrally with the lower part of the guide section 6.

Reference numeral 11 denotes a first elastic body having an elastic force that always acts in a direction to separate the guide portion 6 of the guide plate 5 from the regulating plate 4, and the rod 9 is located between the arm punch 12 fixed to the rod 9 and the bearing 8. It is wrapped around.

A knee lift device (not shown) is attached to the tip of this arm punch 12.
A wire 13 connected to the wire 13 is attached. Reference numeral 14 denotes a locking portion 16 which is rotatably supported on the guide plate 5 and is detachable from a convex portion 15 formed on the bearing 7 as a machine frame at one end.
A locking portion 16 is formed at the other end of the convex portion 1 serving as the machine frame.
5 is a stopper formed with a full stitch hooking part 17 that intersects the seam line n path between the cloth W and the folded piece W, and 18 is always a hooking part 16 of the seam detection body 14. This second elastic body 18 has an elastic force that rotates in a direction to engage the convex portion 15. This second elastic body 18
It is interposed in between.

Incidentally, in the above embodiment, a folded piece W by folding back the edge of the cloth W was used as the piece to be sewn, but it is not a tape.

A piece to be sewn may be used. Next, the operation of this invention will be explained.

First, when the knee raising device (not shown) is activated, the presser foot 1 is raised and the wire 13 is pulled to the right as shown in FIG.

Then, the guide plate 5 also moves to the right with the first elastic body 11 from one direction position to the other direction position, and the locking part 16 of the seam detection body 14 engages with the convex part 15 and the first elastic body 11 This prevents the guide plate 5 from returning due to its restoring force.

In this state, as shown in FIGS. 1 and 2, the folded piece W of the cloth W is folded and the folded part
7 and inserting the end of the cloth into the guide portion 6 of the guide plate 5, it is determined that the folded piece W is being folded even during the interval between the guide portion 6 and the regulating plate 4.

Thereafter, the rubber string G is inserted into the bent portion through the guide portion 10. Next, when the knee raising device is returned to its original position, the presser foot 1 descends and presses the upper part of the folded piece W, and the wire G returns to the state shown by the chain line in FIG.

After attaching the cloth W in this way, when the sewing machine is driven, the cloth W advances in the direction of the arrow Y, and the rubber string G is folded into the folded portion, and a stitch N is sewn with a needle (not shown). .

Then, as shown in Fig. 1, when a seam N is formed on the cylindrical cloth W and the first seam N rotates once and approaches the sewing point, the seam N
The starting point N, and the general hooking part 17 assist.

Since the cloth W moves in the direction of the arrow Y, the seam detection body 14
It rotates clockwise against the elastic body 18'. Then, since the locking portion 16 is disengaged from the convex portion 15, the guide plate 5 is moved in one direction (to the left in the figure) by the restoring force of the first elastic body 11.

As a result, the guide plate 5 and the stitch detection body 14 also move to the left, and the guide section 6, guide section 10, and stitch hooking section 17 are aligned with the stitch line N as shown in FIGS. 3 and 4. Move to a position where they do not intersect. Therefore, the seam N is the guide portion 6,
It does not get caught on the guide guide part 10 and the seam hook part 17,
Therefore, the starting point N, of the seam N, advances to the sewing point again without being hindered from advancing the cloth W, and thus the seam N can be completely formed at the circumferential edge of the folded piece W, of the cloth W. .

Thereafter, when the knee raising device is operated again, the presser foot 1 is raised and the guide plate 5 is returned to the state shown in FIGS. 1 and 2.

As described above, according to the present invention, the guide plate is configured to automatically disengage from the seam line path when the first seam portion is caught on the seam hooking portion, so that the cylindrical When hemming or tape-stitching fabric, the worker no longer has to stop the sewing machine, remove the fabric, and then hem the final seam again, as in the past. Since it is possible to hem a cylindrical cloth in one operation without having to stop and remove the cloth, it has the effect of improving work efficiency, and also prevents the seams from forming on the guide plate. There is no fear that the seams will get caught and damaged, and beautiful seams can be sewn.

[Brief explanation of drawings]

FIG. 1 and FIG. 3 are plan views showing one embodiment of the present invention;
2 and 4 are front views of FIGS. 1 and 3, respectively. 4...Regulation plate, 5...Guide plate, 11...
...First elastic body, 14... Seam detection body, 18...
...Second elastic body. O diagram O O diagram O J diagram O 〆box

Claims (1)

[Claims] 1 In a sewing machine that sews while rotating and feeding the cloth so that the first stitch returns to the sewing mechanism along a straight line,
A regulation plate that is erected parallel to the cloth feeding direction in the direction of cloth feeding than the presser foot and is fixed to the upper surface of the bed at a distance from one side edge of the presser foot in the direction horizontally intersecting the seam line. A guide plate with a U-shaped cross section at the tip that allows the upper surface of the bed to intersect with or retreat from the seam line in the front direction, and a guide plate whose base end is supported on the base, and the guide plate's guide portion is always regulated. a first elastic body having an elastic force acting in a direction away from the plate; and a locking part rotatably supported on the guide plate and detachable from a convex part supported on the machine frame at one end; At the other end, a seam detection body is formed, in which a locking part forms a seam locking part that intersects with the seam line path between the guide part of the guide plate and the upper surface of the bed when the locking part engages with the convex part. A second elastic body having an elastic force that rotates the locking part in the direction of engaging with the machine frame, and when the locking part engages with the machine frame, the guide part of the guide plate and seam detection The seam hooking portion of the body intersects the seam line, the first stitch is locked with the seam hooking portion of the stitch detection body, and the seam detection body is rotated against the second elastic body. A position in which the engagement between the locking part and the machine frame is released in relation to this, and the guide part of the guide plate and the seam catch part of the seam detection body are retracted from the seam line by the restoring force of the first elastic body. A sewing machine cloth guide device that is associated with moving.