JPH0316622Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a rubber attachment mechanism for attaching an annular rubber to a fabric whose shape is maintained in an annular shape when the annular rubber is overlapped and sewn onto the fabric. .

[Conventional technology]

Generally, when annular rubber is sewn onto the waist of pants or the like using a sewing machine, the stitching is performed while adjusting the misalignment by hand to prevent the seams from misaligning. Furthermore, this type of sewn product can only be sewn with the torso of the pants stretched out and the tension of the annular rubber kept constant to produce good rubber wrinkles with a substantially uniform density. This process of sewing annular rubber around the waist is commonly called rubber shearing.

[Problem that the invention attempts to solve]

However, skill is required to adjust the misalignment of fabric seams and to perform rubber shearing while maintaining a constant tension on the annular rubber, which is difficult for amateurs.

This invention solves these problems by making it possible to easily retain the shape of a fabric in a circular shape, automatically and reliably attaching a circular rubber to the fabric, and furthermore, it is possible to keep the shape of the fabric in a circular shape. To provide a rubber attachment mechanism capable of feeding a fabric and an annular rubber layered thereon to a sewing section of a sewing machine with constant tension.

[Means for solving problems]

The rubber attachment mechanism of the annular rubber sewing device according to the present invention is such that a strip wrapped around the guide surface of the fixed frame body is equipped with an inverted U-shaped guide surface that holds the fabric in an annular shape. A fabric feeding mechanism that slides on the guide surface in synchronization with the feeding of the fabric to the section, and a movable frame that moves reciprocally outside the fixed frame in the vertical direction on both left and right sides of the fixed frame. and an annular rubber expansion/contraction mechanism provided with a pair of rubber support pins that are moved toward and away from each other.

[Effect]

The rubber attachment mechanism constructed as described above operates as follows.

When the movable frame body is moved forward to cause the pin to protrude in front of the fixed frame body, and the pin is brought close to each other,
A ring of rubber is wrapped around these pins. When the pin around which the annular rubber is wrapped is separated, the annular rubber is stretched to a size that fits into the fixed frame. When the movable frame is moved back from this state, the annular rubber is disposed around the fixed frame. Therefore, after the fabric is placed on the fixed frame, when the pin is brought close to contract the annular rubber, the annular rubber overlaps the edge of the fabric.

In this case, the contractile force of the annular rubber is applied to the fabric, and since the fabric and the annular rubber overlaid on it rest on the strip of the fabric feed mechanism, the fabric is not fed into the sewing section of the sewing machine. When the strip was synchronously slid on the guide surface of the fixed frame, the annular rubber and the fabric were held by the strip by the contractile force of the annular rubber, and the tension between them was kept constant. The material is then sent to the sewing section of the sewing machine.

〔Example〕

FIG. 1 is a schematic perspective view of an annular rubber sewing device employing a rubber attachment mechanism according to an embodiment of the invention, in which 1 is a cloth feeding mechanism, 2 is a sewing machine, 3 is a movable frame, and 4 is an elastic annular rubber 5 is a first cloth end folding mechanism, and 6 is a second cloth end folding mechanism. These will be explained below.

FIG. 2 illustrates the cloth feeding mechanism 1. As shown in FIG. The cloth feeding mechanism 1 shown in the figure has an inverted U-shaped guide surface 1 formed on the outer surface of a fixed frame 103 having two legs 101 and 102.
04, a strip 105 is slidably wound around the guide surface 104, and mechanisms 106 and 107 for winding and rewinding the strip 105 are provided on each of the two legs 101 and 102. A winding and rewinding mechanism (hereinafter referred to as a first winding and rewinding mechanism) 106 provided on one leg 101 includes a first reel 108 and a first feed roller 109,
A winding and rewinding mechanism (hereinafter referred to as a second winding and rewinding mechanism) 107 provided on the other leg portion 102 includes a second reel 110 and a second feed roller 111. One end of the strip 105 is wound around the first reel 108, the other end is wound around the second reel 110, and the two middle parts are wound around the first reel 108 and the second reel 110. 110
They are wound around the first feed roller 109 and the second feed roller 111, respectively, at locations near the . Both the first reel 108 and the second reel 110 are constantly biased with a predetermined force in the direction of winding the strip 105, and when the strip 105 is fed in, the fed strip 105 is wound up, and when the strip 105 is unwound, it is rotated in the unwinding direction against an urging force. As shown in FIG. 3, the first feed roller 109 and the second feed roller 111 are both driven by separate motors 112, 113.
Driven by A stepping motor or a servo motor is used as the motor 112 that drives the first feed roller 109. Second feed roller 111
The motor 113 that drives the motor 113 is of a type in which a rotation torque is applied to the rotation shaft 114 by the frictional force of the rotating part.

As shown in FIGS. 1 and 2, the sewing machine 2 is a multi-needle type, and a sewing section 201 includes a presser foot 202.
The cloth feed mechanism 20
4 has a driving side roller 205 and a driven side roller 206.
is equipped. Such a sewing machine 2 itself is well known.

Here, while the fixed frame 103 is fixedly installed on the base A, the sewing machine 2 can be moved back and forth while being guided by a guide rod 207. And the above strip 10
The position corresponding to 5 is the operating position, and the position behind it is the standby position.

The movable frame 3 is installed so as to surround the fixed frame 103, and is guided by the guard rod 301 so that it can reciprocate outside the fixed frame 1. The movable frame 3 is provided with an annular rubber expansion and contraction mechanism 4 and a first cloth end folding mechanism 5, which will be described later.
is equipped.

4 and 5 illustrate the annular rubber expansion and contraction mechanism 4. FIG. The annular rubber expansion/contraction mechanism 4 in the figure includes a pair of upper and lower rollers 401, 40 attached to the movable frame 3.
An endless belt 403 is wound around the endless belt 403, and pin holding members 404 and 405 are fixed to each of the two equally divided parts of the endless belt 403, and one of these pin holding members 404 and 405 is connected to the movable frame. An air cylinder 406 is interposed between the body 3 and the pin holding members 404 and 405 hold pins 407 and 408. 409 is a guide rod, which is attached to the pin holding members 404, 40.
Slide members 410 and 411 connected to 5 are slidably fitted.

The annular rubber expansion/contraction mechanism 4 described above works together with the cloth feeding mechanism 1 described above to constitute the rubber attachment mechanism of the present invention.

The first cloth end folding mechanism 5 includes a hook portion 501 that holds the cloth end, and has the function of folding in half the cloth which has been kept in an annular shape by the fixed frame 103. As is clear from FIG. 1, the first fabric end folding mechanism 5 is attached to four locations on the movable frame 3, each of which corresponds to four locations on the outer surface of the fixed frame 1. . The second cloth edge folding mechanism 6 includes a pair of front and rear guide members 602 and 603 arranged on a slide table 601, and serves to further fold back the cloth edge folded in two by the first cloth edge folding mechanism 5 and fold it into three. have.

Next, the action will be explained.

The cloth feeding mechanism 1 operates as follows.

In FIG. 2, when the first feed roller 109 is intermittently rotated in the winding direction (arrow X) of the strip 104 in synchronization with the feed mechanism 204 of the sewing machine 2 by stepping or a servo motor,
is fed out from the second reel 110, and the strip 105 sent in the winding direction
is wound around. At this time, the second feed roller 111
is caused to follow the strip 105 and rotate in the winding direction X while applying a torque in the unwinding direction (arrow Y) to the strip 105. For this reason, the strip 105 is intermittently wound onto the first reel 108 with a constant tension applied thereto.

Further, the first feed roller 109 is operated by stepping or a servo motor to unwind the strip 104 in the Y direction.
When the strip 105 is continuously rotated, the strip 105 is continuously unwound from the first reel 108. At this time,
The second feed roller 111 also feeds the strip 105 while applying torque in the unwinding direction Y.
Therefore, the strip 105 is sent in the unwinding direction by the cooperation of the first feed roller 109 and the second feed roller 111, and the amount of the feed is wound onto the second reel 110.

The strip 1 is wound by the winding and unwinding mechanisms 106 and 107.
05 is intermittently fed in the winding direction Set to standby position.

Therefore, the sewing machine 2 is set to the operating position, and the fixed frame 103 is covered with the fabric W to maintain its annular shape. Then, as described above, the strip 105 is connected to the fabric feeding mechanism 204 of the sewing machine 2. When synchronized and intermittently fed in the winding direction sent.

The annular rubber expansion/contraction mechanism 4 operates as follows.

In FIGS. 4 and 5, the air cylinder 40
When the endless belt 403 is rotated by expanding or contracting the belt 6, the pins 407 and 408 are moved toward and away from each other in the vertical direction as shown by the arrow Z. Furthermore, by moving the movable frame 3 forward, the pins 407 and 408 can be made to protrude forward of the fixed frame 103 as shown in FIG. By moving the pins 407 and 408 backward, the pins 407 and 408 are fixed to the fixed frame 10.
It is possible to retract it to the side of 3. Therefore, as shown in FIG. 6a, the movable frame 3 is moved forward to cause the pins 407, 408 to protrude in front of the fixed frame 103, and the pins 407, 408 are brought close to each other. Wrap the annular rubber R around 407 and 408, and then attach the air cylinder 40
6 (see Figures 4 and 5) and extend the pin 407,
When 408 is separated, the annular rubber R is stretched as shown in FIG. 6b. When the movable frame 3 is moved backward while the annular rubber R is stretched to a size that fits into the fixed frame 103, the annular rubber R is arranged around the fixed frame 103 as shown in FIG. 6c. . From this state, the fabric W is placed over the fixed frame 103 as described above, and then the movable frame 3 is moved forward to a predetermined position as shown in FIG. 6d, and the annular rubber R
are placed around the cloth edge _W1 . After this, the 6th e
When the annular rubber R is contracted by bringing the pins 407 and 408 close together as shown in the figure, the annular rubber R overlaps the cloth edge W ₁ , and the force that causes the annular rubber R to further contract causes the cloth edge W 1 to move above the cloth edge W ₁ . It is pressed against the strip 105. Therefore, as described above, when the strip ₁₀₅ is fed in the winding direction They ride on the strip 105 while being held and are reliably fed together with the strip 105 while keeping their tension constant. Annular rubber R
is placed on top of the cloth edge _W1 , the movable frame 3 is moved back as shown in FIG. 6f, and the pins 407, 408 are pulled out from the annular rubber R.

The first cloth end folding mechanism 5 operates as follows.

7a to 7g show the process of folding the cloth end _W1 of the cloth W placed on the fixed frame 103 in half. The cloth edge W ₁ is raised from the fixed frame 103 by a spacer 118 provided on the fixed frame 103 . FIG. 7a shows a state in which the direction of the hook portion 501 is adjusted so that it faces the fixed frame 103. When the hook part 501 is moved forward from this state, the hook part 501 springs against the spring 50 as shown in FIG. 7b.
It comes into elastic contact with the fixed frame 103 with a force of 2. Next, the seventh
Move the movable frame body 3 forward as shown in Figure c to release the hook part 5.
01 under the cloth edge W ₁ , and as shown in FIG. 7d, the hook portion 501 is pulled in, and the cloth edge W ₁ is held by the hook portion 501 . Next, when the movable frame body 3 is further moved forward, the edge of the cloth is removed as shown in Fig. 7e.
W ₁ is folded back to the outside of the annular rubber R. Next, as shown in Fig. 7f, the hook part 501 is advanced to come into elastic contact with the folded part _W2 , and from this state, the movable frame body 3 is moved forward.
Further move the hook part 5 forward as shown in Fig. 7g.
Completely fold back the cloth edge W ₁ that was locked on 01.
At this time, the cloth edge _W1 is made to protrude slightly beyond the annular rubber R. As described above, the cloth edge _W1 is folded in half. Note that after the two-folding is completed, the hook portion 501 is returned to its original state (for example, the state shown in FIG. 1).

The folding in half described above is performed at four locations around the fixed frame 103, but the folding may also leave an unfolded portion at the cloth edge _W1 .
Such unfolding can be completely eliminated by applying an air jet.

The second cloth end folding mechanism 6 operates as follows.

The second cloth edge folding mechanism 6 is provided in front of the sewing section 201 of the sewing machine 2 as shown in FIG. ₁ will be sent. and,
The second cloth end folding mechanism 6 folds the cloth end _W1 into three and sends it to the sewing section 201. That is, as shown in FIG. 8, the cloth end _W1 protruding from the annular rubber R is raised upward by one of the guide members 602, and the cloth W hanging down in front of the slide table 601 is lifted up by the guide member 602. It is lifted up by the member 602 and separated from the folded portion _W2 . When the fabric W is intermittently fed by the fabric feeding mechanism 1 from this state, the fabric edge W ₁ is gradually introduced between the fabric W and the annular rubber R, and at the exit of the second fabric edge folding mechanism 6. The cloth end _W1 is sandwiched between the annular rubber R and the cloth W, and is completely folded into three. The trifold portion thus formed is sent to the sewing section 201 of the sewing machine 2 and subjected to rubber shearing. FIG. 9 is a cross-sectional view of the annular rubber R sewn into the trifold portion. In the same figure,
N indicates a seam location.

Each of the mechanisms detailed above is controlled by, for example, a computer and operates according to its program.
An example of this will be explained.

A rubber attachment process is performed by the annular rubber expansion/contraction mechanism 4 to the area where the fabric W is held in an annular shape by the fixed frame 103. Next, a two-folding process is performed by the first fabric end folding mechanism 5. Two cloth end folding mechanism 6
is set in front of the sewing section 201 of the sewing machine 2. Then, a cloth feeding process by the cloth feeding mechanism 11, a three-folding process by the second cloth end folding mechanism 6, and a sewing process by the sewing machine 2 are performed simultaneously. In addition,
Sewing by the sewing machine 2 is performed after the cloth feed mechanism 1 preliminarily feeds the trifold portion of the cloth W by a predetermined width. This is to ensure a trifold state. Further, just before the trifold point of the fabric W is rotated once by the cloth feeding mechanism 1, the guide members 602, 603 of the second fabric end folding mechanism 6 are separated so that the starting end of the sewing point is
It is controlled so as not to cause any hindrance when passing between 03 and 03.

[Effect of idea]

According to this invention, the stretched annular rubber can be automatically and reliably attached to the edge of the fabric whose shape is maintained in an annular shape by the fixed frame, and the annular rubber can be overlapped with the edge of the fabric while being stretched in this way. and then sent to the sewing section of the sewing machine. In this case, the contractile force of the annular rubber is applied to the fabric, and since the fabric and the annular rubber overlaid on it rest on the strip of the fabric feeding mechanism, the contractile force of the annular rubber applies the contractile force of the annular rubber to the fabric. The rubber and fabric are held in the strip and fed into the sewing section of the sewing machine with their tension kept constant, and the sewing process creates rubber shearing with a uniform wrinkle density, making workability easier than before. This not only greatly improves productivity, but also reduces manual steps, which has the advantage of making the finished product more uniform.

[Brief explanation of the drawing]

Fig. 1 is a schematic perspective view of an annular rubber sewing device employing a rubber attachment mechanism according to an embodiment of this invention, Fig. 2 is a partially cutaway front view of the cloth feeding mechanism, and Fig. 3 is a winding and winding device. A schematic plan view of the return mechanism, Fig. 4 is a partially cutaway side view of the annular rubber expansion and contraction mechanism, Fig. 5 is a partially cutaway front view of the same, Figs. 6a to 6f are illustrations of the rubber attachment process, and Figs. 7a to 7g. FIG. 8 is an explanatory diagram of the process of folding the fabric edge in two, FIG. 8 is an explanatory diagram of the process of folding the fabric edge into three, and FIG. 9 is a partial sectional view of the fabric into which the annular rubber is sewn. 3...Movable frame body, 4...Annular rubber expansion and contraction mechanism, 1
03...Fixed frame body, 407,408...Pin, W
...Fabric, R...Rubber ring.

Claims (1)

[Scope of Claim for Utility Model Registration] A rubber attachment mechanism for a ring rubber sewing device that uses a sewing machine to sew an annular rubber fitted on the outside of a fabric whose shape is maintained in an annular shape onto said fabric, which retains the fabric in an annular shape. A strip wrapped around the guide surface of a fixed frame body having an inverted U-shaped guide surface that slides on the guide surface in synchronization with the feeding of the fabric to the sewing section of the sewing machine. a feeding mechanism; and a movable frame that reciprocates outside the fixed frame, and a pair of rubber support pins that move toward and away from each other in the vertical direction on both left and right sides of the fixed frame. A rubber mounting mechanism of a circular rubber sewing device, comprising: a mechanism;