JPS5945395B2 - Cloth decurling device for sewing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fabric decurling device for a sewing machine that guides a knitted fabric to a sewing section after removing curls generated at the edge of the knitted fabric in advance when the fabric is sewn.

Conventionally, in order to make thick sleeves of a sweater or the like knitted with wool, a single piece of knitted fabric is folded back, both ends are overlapped, and the ends are sewn with a sewing machine.

However, due to the nature of the knitting method, the ends always curl to the back side of the knitted material.

For this reason, in the past, the curls were previously pressed by hand to stretch and flatten them before being guided to the sewing section of the sewing machine.

As a result, the degree of curl removal becomes uneven, the knitted fabric is overstretched, and good seams are not formed, and the work efficiency is reduced.

The object of the present invention is to provide a fabric decurling device for a sewing machine that can eliminate such drawbacks.

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

In FIGS. 2 and 3, reference numeral 1 denotes a presser bar supported on an arm (not shown) so as to be movable up and down, and a presser foot 2 is provided at the lower end.

3 is a substrate fixed on the bed surface 4 in front of the presser foot 2 in the cloth speed direction.

5 is a first curl removing body rotatably supported on a shaft 6 parallel to the cloth speed direction on the substrate 3; 7 is a sloped portion formed at the tip of the first curl removing body that controls the cloth speed of the presser foot 2; It is inclined in the direction away from the edge of the cloth W to be sewn in the cloth feeding direction at the front in the direction of the cloth.

Of the three ends 7a and 7b of the sloped portion 7, a tip 8 is located from the front end 7a in the cloth speed direction to the front end 8 of the sloped portion 7 in the cloth speed direction.
A is a convex portion that penetrates into the curl of the stretchable cloth W.

Reference numeral 9 denotes a reverse slope portion 6 formed symmetrically with the slope portion 7 with respect to a line parallel to the cloth speed direction passing through the end portion 7b, and these slope portions 7. Curls K (
As shown in FIG. 5, slopes 7T and 8T inclined in the winding direction are formed.

Furthermore, an inclination 9T is formed at the edge of the reversely inclined portion 9 in a direction opposite to the curling direction.

Reference numeral 10 denotes a receiving plate that is rotatably supported on the substrate 3 under the first curl removing body 5 and facing the curl removing surface 5, and has a tip that is similar to the convex portion 8 of the curl removing body 5. It has a large convex portion 11, an inclined portion 12, and a reverse inclined portion 13.

The first curl removing body 5 and the receiving plate 10 each have a convex portion 8.
, 110, 14 is the inclined portion 1. of the first curl removing body 5. An inclined portion 15 having the same shape as the convex portion 8, the reverse inclined portion 9, and the inclined surfaces 7T, 8T, and 9T.
Convex portion 16. Reverse slope part 17 and slopes 15T, 16T, 17
A second curl removing body having a T shape is integrally formed at the tip of the substrate 3 with the removing body 5 and the receiving plate 10 interposed therebetween, facing the first curl removing body.

The second curl removing body 14 and the receiving plate 10 are configured to abut each other only at the convex portions 16 and 11.

Reference numeral 18 and 19 denote an elastic body having an elastic force that always presses the first curl removing body 5 toward the receiving plate 10 and the second curl removing body 14 toward the receiving plate 10. Board 10
, is interposed between the receiving plate 10 and the second curl removing body 14.

Reference numeral 20 denotes an L-shaped presser arm rotatably supported by a support rod 20A provided on the substrate 3, the tip 20a of which is in contact with the base end of the first curl remover 50, and the other end 20b is the presser rod 1. It is locked onto the horizontal rod 1A fixed to the.

The presser foot 21 is a regulating plate provided between the second curl remover 14 and engages with the edge of the cloth W to guide the cloth.

. Next, the operation of this invention will be described.

First, when the presser bar 1 is raised from the state shown in FIG. 3, the presser foot 2 is also raised accordingly.

Then, as the presser bar 1 rises, the horizontal rod 1A comes into contact with the other end of the presser arm 20, and the presser arm 20- is rotated in the direction shown in FIG.

Then, the tip 20a of the presser arm 20 first presses the first curl removing body 5 downward against the elastic body 18 and rotates it clockwise.

When the first curl remover 5 rotates further, the receiving plate 10 rotates clockwise, and the rotation stops when the base end of the receiving plate 100 comes into contact with the substrate 3.

In this state, the first curl removing body °5. Receiving plate 10. The tips of the second curl removers 14 are open (open) with a space for the cloth W to enter.

(Please note that a knee raiser is used to move the presser bar 1 up and down, so both hands are free to use.)

) In this state, the upper cloth W of the two cloths W to be sewn is polymerized with its curl K upward, and the lower cloth W2 is polymerized with its curl K downward.

(See FIG. 5) Then, the curls K of these two cloths W are stretched flat by hand, and first they are guided to a predetermined position below the presser foot 2.

Next, the upper cloth w1 is placed between the curl remover 5 and the receiving plate 10 so that the curl K is flattened and the edge of the cloth is at the intersection of the inclined part 7 and the reverse inclined part 9 of the first curl remover 5. While guiding the lower cloth W2, the curls K are flattened and the edges of the cloth W2 are connected to the receiving plate 10 and the second curl so that the edges of the cloth are at the intersection of the inclined part 15 and the reverse inclined part 17 of the second curl removing body 14. It is guided between the removal bodies 14.

Then, when the presser bar 1 is lowered, the horizontal bar 1A is lowered together with the presser foot 2, whereby the presser arm 20 is no longer locked with the horizontal bar 1A and can be rotated counterclockwise, and the first curl removing body Release the pressure of 5.

Therefore, due to the restoring force of the elastic bodies 18 and 19, the first curl removing body 5. The receiving plate 10 rotates counterclockwise to sandwich the two pieces of cloth W therebetween.

When the sewing machine is started in this state, the cloth W is first fed in the direction of arrow Y.

In the following explanation, upper cloth W1 and lower cloth W
Since the effect that occurs on 2 is the same, the explanation of the lower cloth W is omitted (.

When the cloth W is fed and the curl K generated at the edge of the cloth approaches the convex portion 8 of the first curl removing body 5, the convex portion 8 has a slope 8T that is inclined in the curling direction, so that the curl K is removed. slides smoothly onto the convex portion 8.

Since the tip of the convex part 8 extends in front of the inclined part 7 in the cloth feeding direction, one portion of the large curl gradually pushes toward the right in FIG. 5 while the curl passes over the convex part 8. One part is spread out and reduced to a large curl.

(See Figure 6) Here, since the convex portion 8 and the receiving plate 10 are configured to contact only at the lower surface of the convex portion 8, the clamping pressure of the cloth by the receiving plate 10 and the first curl removing plate 5 is applied to the convex portion. The 8th part is the largest.

Therefore, the cloth W that has passed through the lower part of the convex portion 8 has an inclined portion 7° 1 formed on the first curl removing plate 5 and the receiving plate 10.
A pulling force acts between the two to create an even larger curl and reduce the part.

The large curl K decreases to 2 small curls, and the curl gradually decreases by passing over the inclined part 7 which is inclined in the direction away from the cloth edge of the cloth W. (see figure) Finally, it is guided slightly by the reverse slope part 9 (as shown in the figure) at the end 7b of the slope part, and enters between the first curl removal plate 4 and the guide plate 10, where it is pressed flat. .

The curl thus flattened is guided to the sewing section below the presser foot 2, where a stitch is formed by the needle N.

In addition, in the above embodiment, when sewing two pieces of cloth or when sewing a curled edge of one piece of cloth, the first curl removing plate is attached so that its tip is It may be configured such that it is supported so as to be movable up and down on the bed surface so as to be able to come into contact with and separate from the bed surface, and the up and down movements are linked with the up and down movements of the presser bar.

As described above, according to the present invention, the convex portion first removes the larger curl.

Next, small curls are gradually removed by the inclined part, and finally the curls are removed by pressing the curl remover, so that the curls are completely removed and the degree of removal is uneven. Therefore, it is possible to sew a good-quality sewn product with beautiful seams and no wrinkles at the seamed portion.

Furthermore, since it is no longer necessary to flatten the curls of the cloth in the J work, the work efficiency is greatly improved.

[Brief explanation of drawings]

Figure 1 is an exploded perspective view of the device according to the first embodiment of this invention;
The figure is a plan view of the device shown in FIG. 1, FIG. 3 is a front view of FIG. 1, FIG. 4 is a left side view of FIG. 2, FIG. 5 is a partial plan view showing the device in use, and FIG. The figure is a sectional view taken along the line A-A in FIG. 2 showing the state when the curl passes through the convex part, and FIG. 7 is a front view of the embodiment device showing the cross section of the curl when the curl passes through the inclined part. ... Slanted part, 8... Convex part, γT
... Slope, 5 ... First curl removal body,
14...Second curl removal body, 10...
Receiving plate, 18.19...Elastic body.

Claims (1)

[Scope of Claims] 1. In a sewing machine that sews a curled part of a workpiece along the curled edge, an inclined part that slopes in a direction away from the edge of the fabric from the front to the front in the feeding direction of the fabric. and a convex part and an inclined part that intersect horizontally with the cloth feeding direction and protrude in a direction away from the cloth edge in front of the cloth speed direction of the sloped part of the cloth, and A slope formed on the edge of the convex part and inclined from one end edge to the other in the direction in which the cloth is curled;・A method for removing fabric in a sewing machine that consists of a decurling body supported in a downwardly movable manner, a receiving plate placed oppositely above or below the decurling body, and an elastic body that always presses the decurling body toward the receiving plate. Curl removal device.