JPS5892390A - Apparatus for removing curl of fabric in sewing machine - Google Patents

Abstract

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

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fabric decurling device for a sewing machine that guides the fabric to a sewing machine sewing section after removing curls that occur at the edge of the fabric before sewing the fabric.

Conventionally, in order to make a large quantity of sleeves such as sweaters 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 knitted material, 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 and the knitted fabric is overstretched, making it difficult to form good seams and reducing production efficiency.

This invention was devised in order to eliminate such conventional drawbacks, and it is possible to completely remove curls from fabrics, as well as remove various heavy curls from fabrics in sewing machines. To provide a decurling device.

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

In the figure, reference numerals 1 and 2 refer to a pair of curl removers whose middle portions are rotatably supported on a shaft 8 parallel to the cloth feeding direction;
Reference numeral 5 denotes an inclined part formed at the tip of the curl removing body 1.2, which is inclined in a direction away from the cloth edge Wa from the front to the front in the feeding direction of the cloth W (see Fig. 2). . 6,7
is a direction from the front end portions 4a, 5a in front of the inclined portions 4.5 in the cloth feeding direction, horizontally intersecting the cloth feeding direction in front of the inclined portions 4, 5 in the cloth feeding direction, and moving away from the cloth edges W a , W a' Convex portions 8 and 9 projecting from the rear end portions 4 and 9 of the inclined portions 4 and 5
A reverse sloped part 4° is formed symmetrically with the sloped parts 5, 5 with respect to a line parallel to the cloth feeding direction passing through b, 5b. Slopes T and T' that are inclined in the curling direction of w and w' are formed.

Reference numeral 10 denotes a receiving plate which is disposed between the curl removing bodies 1 and 2 and whose middle part is rotatably supported on the curl removing body 1 so as to be able to come into contact with and separate from the tips of both curl removing bodies, and the curl removing body is attached to the tip of the receiving plate. Convex portion G of 1 and 2, convex portion 11 which is larger in rotation than M, inclined portion 1
2 and a reverse slope portion 18.

14.15 is a first elastic body that has an elastic force that always presses the tip of the curl remover 2 in the force direction of the receiving plate lO and the tip of the receiver plate lO in the direction of the curl remover 1, and The plate 10 is interposed between the receiving plate 10 and the curl remover 1.

16 is a cylindrical body supported on a support rod 18 as a machine frame fixed to the bed surface 17 so that the lower end opening 16a is located at the rear end upper blade of the curl removal body 2; A hollow pressure regulating screw screwed into the upper end opening 16b, 19 a shaft rod loosely fitted into the hollow portion 18a of the pressure regulating screw 18 and the cylindrical body 16, and 20 a presser fixed to the lower end of the shaft rod 19. , acts to rotate the curl removing body 2 against the first elastic body.

A second elastic body 21 is interposed between the upper end of the presser 20 and the lower end of the pressure adjusting screw 18 and always acts in a direction to press the presser 20 above the curl remover 2. 18
The elastic body 2 that acts on the pusher 20 by rotating the
1 is made variable, thereby making it possible to adjust the clamping pressure with which the curl removers 1, 2 and the receiving plate 10 clamp the cloths w, w'. And this dormitory;
The elasticity and force are weaker than the elastic force of the first elastic body 14.15, so the presser zO rises at 6' due to the restoring force of the first elastic body 14.15 of the curl removal body 2 and reaches a predetermined height. It is located in the

Reference numeral 22 denotes a stopper rotatably supported on a support 28 fixed on the bed 17, the tip 22a contacts the upper end of the shaft 19, and the rear end 22b is operated manually (for example, in conjunction with presser foot lifting lever operation). ) to rotate the stopper 22 counterclockwise in the figure.

Next, the operation of this invention will be described.

First, from the state shown in Figure 4, when the lever 24 is actuated upward, the stopper 22 rotates counterclockwise and presses the upper end of the shaft rod 19, and as shown in Figure 4, the pusher 20 descends and the first
The curl remover 2 is rotated clockwise about the shaft 8 against the elastic body 14. Along with this, the receiving plate lO also moves to the elastic body 16.
Rotate clockwise against 1, -
As shown in Fig. 4, the ends of the curl remover 1.2 and the receiving plate 10 are wide enough to allow the fabrics W and W' to be easily guided between them. The upper cloth W of the cloths w and w' is polymerized with its curl K upward, and the lower cloth W' is polymerized with its curl K downward.

Then, while flattening the curls K of the upper cloth W, the edges of the cloth are aligned with the slope 5 of the curl remover 2 and the opposite slope s9.
At the same time, while flattening the curls K of the lower cloth V, the cloth edge Wa is inclined oppositely to the inclined part 4 of the curl removing body 1. Guide it between the receiving plate lO and the curl remover 1 so that it comes to the intersection of the parts 8 (see FIG. 2).

The pusher 20 that releases the lever 24 is the first
The counterclockwise rotation of the receiving plate 10 and the curl remover 2 due to the restoring force of the elastic bodies 14 and 15 causes them to move upward, and the shaft rod 19 also rises, as shown in FIG. are returned to their original positions, and in this state, the cloths w and w' are clamped by the elastic force of the elastic bodies 14 and 16.

Then, depending on the thickness of the cloths w and w', the curl removing body 1,
There may be cases where it is desired to change the clamping pressure in step 2 and set it to the optimum decurling shape. The elastic force gradually increases and becomes stronger than the elastic force of the first elastic bodies 14 and 15, and finally the presser 20 pushes the curl removing body 1 and the receiving plate 10 slightly against the first elastic bodies 14 and 15. The clamping pressure acting on the tips of the curl removers 1 and 2 is reduced.

Moreover, if the pressure adjustment screw 18 is rotated in the opposite direction, the second elastic body 2
1 first expands and its elastic force gradually weakens to T. Therefore, the elastic force of the first elastic body 14.15 causes the receiving plate lO
Then, the curl remover 2 rotates counterclockwise, and the clamping pressure acting on the tips of the curl remover ``1'' and ``2'' increases.

After adjusting the clamping pressure of the curl removers 1 and 2 to the optimum state using the pressure adjustment screw 18 according to the thickness of the cloths w and w' and the type of cloth, when the sewing machine is started, first the cloth W is sent in the direction of arrow Y. In the following description, the effects occurring on the upper cloth W and the lower cloth W' are the same, so a description of the lower cloth W' will be omitted.

The cloth W is fed, and the curls K generated at the ends of the cloth are removed by the curl remover 2.
When approaching the convex part 7, since the convex part 7 has a slope T inclined in the curling direction, the curl smoothly slides onto the convex part 7.

Since the tip of the convex part 7 extends in front of the inclined part 5 in the cloth feeding direction, while the convex part 7 passes over the convex part 7, one part of the large curl is pushed out and becomes a curl. 1 part decreases. Here, since the convex portion 7 and the receiving plate lO are configured to contact only at the lower surface of the convex portion 7, the receiving plate 10
The pinching pressure of the cloth W between the curl removal plate 2 and the curl removal plate 2 is greatest at the convex portion 7 portion. Is this a convex part? The cloth W passing through the lower part is provided with an inclined portion 5 formed with the cloth W on the curl removal plate 2 and the receiving plate 10,
A pulling force acts between 12.

For curls in which 1 is reduced for large curls and 2 for small curls, the curl gradually decreases by passing over the slope part 5, and finally reaches the rear end 5b of the slope part 5 to the reverse slope part 9. The curl remover 2 and the receiving plate 1 are guided while being regulated.
0, the curl K is completely removed and the cloth edge Wa is pressed flat.

The fabric edge Wa, which has been flattened in this manner, is guided to the sewing section below the presser foot 25, where a stitch is formed by the needle N.

As described above, according to the present invention, the convex portion first removes the larger curls, then the inclined portion gradually removes the smaller curls, and finally the curl remover is removed. Curls are removed by the clamping pressure with the receiving plate, making it possible to obtain sewn products with beautiful seams.Moreover, there is no need to manually flatten the curls of the fabric, greatly improving work efficiency. This has the effect of uniformly removing curls.

In addition, the clamping pressure of the curl removal plate can be set to the optimum curl removal state depending on the thickness or type of fabric, so it is possible to remove curls from fabrics of any type or thickness. This has the effect of widening the scope of its use.

[Brief explanation of drawings]

FIG. 1 is a perspective view of essential parts of the present invention, FIG. 2 is a partial plan view showing how the invention is used, and FIGS. 8 and 4 are partially sectional front views showing how the invention is used. 1.2... Curling removal body 4.5... Inclined part 6.7... Convex part 10... Receiving plate 14.15... First elastic body -18... Pressure adjustment screw 20 ... Presser 21 ... Second elastic body

Claims (1)

[Claims] In a sewing machine that sews a curled part of a workpiece along the curled edge when the edge is curled, 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 portion that extends from the end of the inclined portion of the cloth on the front side in the cloth feeding direction, intersects horizontally with the cloth feeding direction in front of the sloped portion in the cloth feeding direction, and protrudes in a direction away from the cloth edge. and two flat plates with their tip portions facing each other vertically, each having a sloped portion and a sloped surface formed on the edge of the convex portion and sloped from one end edge to the other in the direction in which the cloth is curled. a curl remover, which is arranged on the bed in front of the presser foot in the cloth feeding direction, and the middle part of the upper plate is rotatably supported by the middle part of the lower plate so that the leading end can be moved toward and away from the presser foot; A receiving plate which is disposed between the curl removing bodies and whose intermediate portion is rotatably supported by the lower curl removing body so that the distal end comes into contact with and separates from the distal ends of both curl removing bodies, both curl removing stocks and the receiving plate. The rear end of the upper curl remover is arranged so that the curl remover rotates against the first elastic member, and acts so that the distal ends of both the curl removers and the receiving plate come into contact with each other. A presser is supported on the machine frame so that it can reciprocate, a pressure adjustment screw is screwed into the machine frame so that it can rotate vertically, and a pressure adjustment screw is interposed between the pressure adjustment screw and the presser, A cloth decurling device for a sewing machine, comprising: a second elastic body having elasticity that rotates the upper decurling body against the first elastic body in relation to the rotation.