JPH0246850Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is a cloth feeding mechanism of a circular rubber sewing device that maintains the shape of the cloth in an annular shape when sewing the cloth and sends it to the sewing section of the sewing machine. Regarding.

[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 fully expanded and with the tension of the annular rubber constant to produce good rubber wrinkles with a substantially uniform density. This process of sewing annular rubber into 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.

In addition, to mechanize this work, there is a device that uses a sensor to detect the meandering of the fabric and uses a correcting device to correct the deviation. It has been difficult to completely correct seam misalignment due to uneven tension between the top fabric and the base fabric.

This invention solves the above problems by providing a fabric feeding mechanism that can easily keep the fabric in a circular shape and reliably feed the fabric to the sewing section of the sewing machine without causing any misalignment of the seams. The purpose is to

[Means to solve the problem] The measures taken to achieve the above purpose are:
A mechanism for winding and rewinding a strip that is slidably wrapped around the guide surface is provided on each of the two legs of a fixed frame body that is provided with an inverted U-shaped guide surface that holds the fabric in an annular shape. , the first winding and rewinding mechanism provided on one leg has a first reel that is always biased in the direction of winding the strip, and a first reel that is always biased in the direction of winding the strip, and a first reel that winds the strip in synchronization with the fabric feed mechanism of the sewing machine. a first feed roller that feeds the strip to the first reel by being driven to rotate intermittently in the pick-up direction, and feeds the strip from the reel by being driven to continuously rotate in the unwinding direction of the strip; The second winding and rewinding mechanism provided on the other leg includes a second reel that is always biased in the direction of winding the strip, and a second reel that is always biased in the direction of winding the strip, and a second reel that is always biased in the direction in which the strip is wound. By working together with the first feed roller to apply a feeding force to the strip in the unwinding direction, the strip is sent to the second reel, while when the strip is fed in the winding direction, the strip is A second feed roller is provided which is rotated in the winding direction while following the strip while applying torque in the unwinding direction.

[Effect]

The cloth feeding mechanism configured as described above operates as follows.

When the end of the fabric is fitted into the fixed frame, the fabric is held in an annular shape. When the stretched annular rubber is fitted to the outside of the fabric by the rubber attachment mechanism, the force of the annular rubber to contract causes the fabric to be pressed against the band wrapped around the guide surface of the fixed frame. Ru. Therefore, when the strip is slid on the guide surface of the fixed frame by the winding and unwinding mechanism of the cloth feeding mechanism, the fabric is reliably fed together with the strip.

Further, during sewing, the strip is intermittently fed under constant tension by the action of the winding and rewinding mechanism.

〔Example〕

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

FIG. 1 illustrates a 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 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
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 rotational torque is applied to the rotating shaft 1140 by the frictional force of the rotating part.

As shown in FIG. 4, the strip 105 is made of a thin metal plate having engaging holes 115 at equally spaced positions on both ends in the width direction, and as shown in FIG. This is a configuration in which a protrusion 116 provided on the first reel 108 or the second reel 110 engages.

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, the fixed frame 103 is fixedly installed on the base A, while the sewing machine 2 is accommodated in a guide rod 207 and can be moved back and forth. 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 body 3 is installed so as to surround the fixed frame body 103, and the guide rod 301
It is designed to be able to reciprocate outside the fixed frame 1 by being guided by. The movable frame 3 is equipped with a rubber attachment mechanism 4 and a first cloth end folding mechanism 5, which will be described later.

The rubber mounting mechanism 4 includes a pair of upper and lower pins 401 and 402 that are moved toward and away from each other and are provided on the movable frame 3. The first cloth edge folding mechanism 5 includes a hook portion 501 that clamps the cloth edge, and a fixed frame body 103.
It has the role of folding in half the edge of the fabric which has been kept in a circular shape. 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, 603 disposed on a slide table 601, and further folds back the cloth edge folded in two by the first cloth edge folding mechanism 5 and folds it into three. It has a role to play.

Next, the action will be explained.

The cloth feeding mechanism 1 operates as follows.

In FIG. 2, the first winding and rewinding mechanism 106
When the first feed roller 109 is intermittently rotated in the winding direction (arrow The strip 105 that is unwound from the second reel 110 of the return mechanism 107 and sent in the winding direction X by the first feed roller 109 is wound around the first reel 108 by the amount of the feed. At this time, the second feed roller 111 rotates in the winding direction X following the belt 105 while applying torque in the unwinding direction (arrow Y) to the belt 105. For this reason, strip 1
05 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. In this case, since the strip 105 is made of a thin metal plate and does not stretch, the fabric W is reliably sent to the sewing section 201 without being stretched or twisted.

The rubber attachment mechanism 4 operates as follows.

As shown in FIG. 6a, the movable frame 3 is moved forward to cause the pins 401, 402 to protrude in front of the fixed frame 103, and these four pins 401, 402 are brought close to each other. Wrap the annular rubber R around the pins 401 and 402.
When 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.
Deploy them around W ₁ . After this, as shown in Fig. 6e, the pins 401 and 402 are brought close together and the annular rubber R
When contracted, the annular rubber R overlaps the cloth edge _W1 ,
The cloth edge W ₁ is pressed against the strip 105 by the force that causes the annular rubber R to shrink further. Therefore, as described above, the strip 105 is wound in the winding direction
(See Figure 2) to ensure that the fabric W is fed to strip 1.
Sent with 05. After the annular rubber R is placed on the cloth edge _W1 , the movable frame 3 is moved back as shown in FIG. 6f, and the pins 401 and 402 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 103 forward to insert the hook portion 501 below the cloth edge W ₁ as shown in FIG.
1 to hold the cloth edge W ₁ . Next, the movable frame 103
As it is further moved forward, the cloth end _W1 is folded back to the outside of the annular rubber R as shown in FIG. 7e. Next, as shown in Fig. 7f, the hook part 501 is moved forward to come into elastic contact with the folded part ^W2 , and from this state, the movable frame 103 is further moved forward until it is locked on the hook part 501 as shown in Fig. 7g. Completely fold back the edge W ₁ of the fabric. At this time, the cloth edge _W1 is made to protrude slightly beyond the annular rubber R. Due to the above, the cloth edge
W ₁ 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 W ₁ protruding from the annular rubber R is raised by one guide member 602, and the cloth W hanging down in front of the slide table 601 is raised by the guide member 602. It is lifted up 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, number 2 indicates a seam point.

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 rubber attachment mechanism 4 to the place 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, and then a second A cloth end folding mechanism 6 is set in front of a sewing section 201 of a sewing machine 2. Then, the cloth feeding process by the cloth feeding mechanism 1, the trifold process by the second cloth end folding mechanism 6, and the sewing process by the sewing machine 2 are performed simultaneously. In addition, sewing machine 2
The sewing 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. Also, the trifold part of the fabric W is the fabric feeding mechanism 1.
Immediately before one rotation is made, the guide members 602, 603 of the second cloth edge folding mechanism 6 are separated, and the starting end of the sewing area is aligned with the guide members 602, 603.
It is controlled so that it does not become a hindrance when passing between.

[Effect of idea]

According to this invention, by covering the fixed frame with the fabric and retaining its shape in an annular shape, the edges of the fabric are completely spread out and tightened, and when the fabric is sent to the sewing section of the sewing machine, there is a winding and unwinding mechanism. Since the fabric is firmly pressed by the annular rubber against the strip that is fed in the winding direction with a constant tension applied to it, the fabric is fed together with the strip without twisting, resulting in a uniform density due to sewing. Rubber wrinkles are formed and good rubber shearing is performed.

[Brief explanation of the drawing]

Fig. 1 is a schematic perspective view of an annular rubber sewing device employing a cloth feeding mechanism according to an embodiment of this invention, Fig. 2 is a partially cutaway front view of the fabric feeding mechanism, and Fig. 3 is a winding device. A schematic plan view of the unwinding mechanism, FIG. 4 is an enlarged perspective view of the strip, and FIG. 5 is an enlarged partial sectional view for explaining the state of winding of the strip around the roller.
Figures 6a to 6f are explanatory diagrams of the rubber attachment process, Figure 7a
Figures 7g to 7g are explanatory diagrams of the process of folding the fabric edge in two, Figure 8 is an explanatory diagram of the process of folding the fabric edge into three, and Figure 9 is a partial sectional view of the fabric into which the annular rubber is sewn. 1... Cloth feeding mechanism, 2... Sewing machine, 101,1
02...Legs, 103...Fixed frame, 104...
Guide surface, 105... Strip, 106... First winding and unwinding mechanism, 107... Second winding and unwinding mechanism, 108... First reel, 109... First feed roller, 110... Third 2 reel, 111...second feed roller, 204...fabric feed mechanism of sewing machine, W
...Fabric, X... Winding direction, Y... Rewinding direction.

Claims (1)

[Claims for Utility Model Registration] A band that is slidably wrapped around each of the two legs of a fixed frame body that is equipped with an inverted U-shaped guide surface that holds the fabric in an annular shape. A winding and rewinding mechanism is provided, and the first winding and rewinding mechanism provided on one leg is connected to a first reel that is constantly biased in the direction of winding the strip, and a cloth feeding mechanism of the sewing machine. The strip is intermittently rotated in the winding direction of the strip in synchronization with the above to feed the strip to the first reel, while the strip is continuously driven in the unwinding direction of the strip to feed the strip from the reel. A second winding and rewinding mechanism provided on the other leg includes a second reel that is constantly biased in the direction of winding the strip, and a first feed roller. When the strip is fed out, the strip works together with the first feed roller to apply a feeding force in the unwinding direction to the strip, thereby feeding the strip to the second reel, while the strip is fed in the winding direction. and a second feed roller that is rotated in the winding direction while following the belt while applying torque in the unwinding direction to the belt when being fed to the belt. Cloth feeding mechanism of the loading device.