JPS63242519A - Connecting method for flat rubber in loop shape - Google Patents

Abstract

PURPOSE:To enable the sewing parts to be exactly lapped without position shifting by a method in which the long flat rubber is formed in a loop shape, and after its cut end is lapped halfway on said flat rubber, this lapped portions are sewed, and the flat rubber connected to the loop portion is cut near the sewed parts. CONSTITUTION:The tip of a flat rubber 1 is temporarily fixed on a sewing holder 2 by pushing from above. Then, the flat rubber 1 is inserted halfway into the flat rubber hole 12 of the tip of a loop winding piece. The loop winding piece 4 is rotated by one revolution, and then the flat rubber is softly wound on two adjusting rods 5 for regulating its length and on the sewing holder 2, and is brought in loop shape by lapping the rubber on the cut end temporarily fixed. The lapped portions are sewed and the flat rubber is made in a loop shape before the said rubber 1 is cut. The length of the loop may be changed by regulating the position of two adjusting rods 5. To minimize the error of the size of the connected loop, the rubber is tensioned at the degree of strength in which the flat rubber does not almost elongate, when it is wound in a loop shape. Thus the loop is made.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for producing loop-shaped flat rubber from a long continuous flat rubber.

[Prior art and its problems] Flat rubber connected in a loop shape is often used in socks, underwear, and the like. Incidentally, rubber bands that are already formed into a loop shape at the time of manufacture are commercially available.

However, this rubber band cannot be used in the same way as a flat rubber whose surface is covered with a stretchable fabric, i.e.
Flat rubber is widely used in high-end products because its maximum elongation is limited by the fabric on the surface, so that no excessive tensile force is applied to the rubber.

A method for connecting flat rubber pieces in a loop has already been developed. The conventional method is to cut the flat rubber to a certain length by pinching the tip and the cut part, then grasp both ends to form a loop, and sew both cut ends with a blind sewing machine. I'm wearing it. In this method, since the tip of the loop-shaped flat rubber is sewn, the tip cannot be held during sewing, and it is necessary to hold the tip at least at a position set back from the tip by the sewing machine's seam allowance. The thick and strong flat rubber allows the tips to be overlapped accurately by holding the part slightly set back from the leading edge. However, flat rubber, which is thin and weak, has the disadvantage that the tip from the holding position is flexible and easily changes. For this reason, if a position is maintained at a distance of, for example, 10 to 20 m from the leading edge, it will not be possible to overlap both ends accurately without positional deviation when forming a loop.

If the overlapping condition is poor, this part will be sewn using a bartack sewing machine, so it will not be possible to securely sew and connect the parts.

Particularly troubling is that it is difficult to accurately overlap both ends of the rubber bands, and even the slightest misalignment makes it impossible to overlap each other. For this reason, the more difficult it is to accurately position the flat rubber bands, the more accurately they need to be overlapped, and it is necessary to solve difficult technical problems that conflict with each other.

Furthermore, since the flat rubber connected in a loop is stored in a container in a folded state, it has a tendency to bend at the bent portion. If the bent end becomes the cut end, no matter how much you improve the positional accuracy of the holding member,
It is not possible to exactly overlap the two ends. Conventional methods that cannot solve these drawbacks are limited by the thickness of the flat rubber that can be connected in a loop shape, and even good quality rubber with little deformation has a width of 6 squares or more, and low quality rubber has a width of 10 to 13 squares. Even thick ones cannot be used.

For this reason, when it comes to thin flat rubber, the reality is that the worker looks at each piece at first glance and sews it into a loop shape by hand. Rubber requires more advanced technology, and has the drawback of poor efficiency and extremely low productivity.

[Object of the Invention] The present inventor completed the present invention after repeating a large number of experiments and prototypes with the aim of solving the conventional drawbacks and realizing a loop-like connection of thin flat rubber.

Therefore, an important object of the present invention is to connect flat rubber bands that could not be sewn into a loop shape using conventional methods, and to connect the flat elastic bands in a loop shape so that the connected parts can be sewn securely and firmly without misalignment. This is to provide a way to do so.

[Means for solving conventional problems] The method of connecting flat rubbers in a loop shape according to the present invention is as follows: After making a long flat rubber into a loop shape and overlapping the cut end in the middle of the flat rubber,
It consists of a step of sewing the overlapping portion of the tip of the flat rubber, and a step of cutting the flat rubber that continues to the loop-shaped portion after being sewn in the vicinity of the sewn portion.

[Operations and Effects] The outline of specific examples of the present invention is shown in FIGS. 1 to 4, and the operations will be explained based on these.

The loop-shaped connection method of the present invention involves connecting long flat rubber pieces into a loop-shape and then cutting them, instead of the conventional method in which flat rubber is cut into a certain length, then looped, and both ends are connected. are doing. A specific example is to temporarily fix the tip of a flat rubber l as shown in Fig. 1, wrap it into a loop as shown in Fig. 2, overlap the temporarily fixed ends, and then as shown in Fig. 3. The overlapping portions are sewn together, and as shown in FIG. 4, the vicinity of the continuous loop-shaped portion is cut to form a loop-shaped flat rubber.

In this method, uncut flat rubber pieces can be overlapped and connected in a loop shape, so the sewn parts can be overlapped accurately without positional deviation. This is because when making a loop and overlapping the cut end as shown in Figure 3, the end can be held and overlapped further than the sewn part, as shown by arrow A, so the sewn part Even if the rubber has a tendency to deform to some extent, or even if it is thin and flexible flat rubber, it can be overlapped accurately.

Therefore, the method of the present invention achieves the excellent effect of reliably and firmly connecting the parts by using the darning rubber, which could not be sewn in a loop shape using the conventional method.

Incidentally, in the inventor's experiments, it was possible to accurately connect approximately 500 extremely thin flat rubber pieces of 4 mm @ in one hour with a lateral positional deviation of less than one degree.

Moreover, the method of the present invention, which can accurately connect rubber regardless of its thickness, is extremely effective in connecting not only high-quality rubber but also low-quality rubber without misalignment.

As described above, by using the method of the present invention,
It is now possible to efficiently and inexpensively mass-produce flat rubber loops, which were previously manufactured one by one by hand.

[Preferred Embodiment] Hereinafter, a preferred embodiment of the method of connecting flat rubber pieces in a loop shape according to the present invention and a specific example of an apparatus that can be used in this method will be described.

However, the present invention is not limited to the following embodiments, and can be modified in various ways without departing from the scope of the claims.

As shown in FIGS. 1 and 7, the tip of the flat rubber l whose tip has been cut and whose middle portion is not cut is pressed from above and temporarily fixed to the sewing table 2. At this time, the middle of the flat rubber 1 is inserted into the flat rubber hole 12 at the tip of the loop winding piece. As shown in FIGS. 2 and 8, the looped piece 4 is rotated once, and the flat rubber l is lightly wrapped around the two adjustment rods 5 for length adjustment and the sewing table 2, and temporarily fastened. Lay it over the cut end to form a loop.

As shown in FIG. 3, the overlapping parts are sewn together and connected into a loop before cutting the flat rubber l. After the loop is sewn, as shown in FIG. 4, the flat rubber l connected to the loop is cut near the sewn portion to separate the loop.

The length of the loop can be varied by adjusting the positions of the two adjustment rods 5. The longer the gap between the two adjustment rods 5 or the lower they descend from the sewing table 2, the larger the loop becomes. In order to reduce the error in the size of connected loops,
When winding the flat rubber into a loop as shown in Figure 2, the loop is created by pulling the flat rubber with such force that it hardly stretches.

When sewing the overlapped parts, it is preferable to press the overlapped parts of the flat rubber with the sewing pressing piece 6 and sew.

A device for temporarily fixing the tip of the flat rubber 1, making a loop with it, and sewing the overlapped portion is shown in FIGS. 5 to 11.

The loop connecting device of the flat rubber 1 shown in FIGS. 5 and 6 is as follows:
A sewing table 2 on which the flat rubber l is temporarily fixed and sewn, and a tip plate stopper 3 on which the tip of the flat rubber l is pressed and temporarily fixed on the sewing table 2.
, a loop winding piece 4 that makes the flat rubber l into a loop, an adjustment rod 5 that adjusts the size of the loop of the flat rubber 1 made by the loop winding piece 4, and pressing the sewn part of the overlapped flat rubber l. Cut the sewing pressing piece 6, the pinching piece 7 which sandwiches the sewn portion of the flat rubber l between the sewing pressing piece 6, and the flat rubber 1 sandwiched between the sewing pressing piece 7 and the sewing pressing piece 6. It is equipped with a cutter 8 and a sewing machine 9 for sewing flat rubber pressed by a sewing presser piece 6.

The sewing table 2 is formed into an arm shape in which a flat rubber can be looped around the arm, and the upper surface thereof is formed into a planar shape.

The tip plate stopper 3 is fixed to the tip of a rod of a cylinder 10, and is moved along the upper surface of the sewing table 2 by the cylinder 10 to temporarily fix the tip of the flat rubber 1 to the upper surface of the sewing table 2.

The loop winding piece 4 has a crank-like overall shape, and a flat rubber hole 12 is bored at the tip of the crank bin 11 into which the flat rubber 1 is movably inserted.
It is formed into a cylindrical shape that can be pulled out. crankshaft 13
When this rotates around , the flat rubber l is wound in a loop shape surrounding the sewing table 2. Therefore, the length of the crank arm and the position of the crankshaft are adjusted such that when the crank arm rotates once, the crank pin 11 rotates around the outer periphery of the sewing table 2 and the adjustment rod 5 once. As shown in FIG. 6, the crankshaft 13 is connected to a motor 14 via a gear, a pulley, and a belt, and is rotated by the motor 14 to form a loop with the flat rubber 1.

Incidentally, in the apparatus shown in FIG. 6, the container 15 for supplying the flat rubber l to the loop winding piece 4 also rotates together with the loop winding piece 4 to prevent the flat rubber l being sent out from being twisted. Therefore, in this device, the rotating shaft of the container 15 and the loop winding piece 4 are simultaneously rotated by the single motor 14.

The adjustment rods 5 are provided below the sewing table 2 horizontally and parallel to each other. Although not shown, the width of the two adjustment rods 5 can be freely adjusted, or they can be moved up and down and fixed so that the size of the loop can be adjusted.

The sewing press piece 6 presses the flat rubber l, which is wound into a loop and overlapped, against the sewing table 2 during sewing. Therefore, as shown in FIG. 5, this sewing press piece 6 is formed horizontally with two branched ends, and the two branched parts are located above the overlapping part of the flat rubber and can be moved up and down. It is freely arranged, and both sides of the flat rubber sewing part are pressed against the sewing table 2 at the branching part.

The pinching piece 7 is disposed close to the sewing pressing piece 6, and is arranged close to the sewing pressing piece 6.
Separately, it is arranged so that it can move up and down.

``The distance between the pinching piece 7 and the sewing pressing piece 6 is adjusted so that the tip of the cut flat rubber l can be easily pinched there.

The cutter 8 cuts the flat rubber l sandwiched between the clamping piece 7 and the sewing presser piece 6 in the raised position with the lower surfaces of the clamping piece 7 and the sewing presser piece 6. It is disposed on the lower surface of the sewing press piece 6 so as to be able to come in and out. Normally, it waits in a retreated position so as not to interfere with the processing of flat rubber.

Any sewing machine 9 that can sew overlapping flat rubber l can be used.

The process of sewing the flat rubber 1 into a loop using the apparatus shown in FIGS. 5 and 6 will be described with reference to FIGS. 7 to 11.

(2) The flat rubber l whose tip has been cut off is held by being held between the pinching piece 7 and the sewing press piece 6, as shown in FIG. In this state, the tip plate stopper 3 moves along the upper surface of the sewing table 2 from the solid line position to the chain line position.

At this time, when the tip plate stopper piece 3 hooks the flat rubber l with its front edge and moves forward, the sewing presser piece 6 rises a little and releases the pinched state with the clamping piece 7, and the tip of the flat rubber l is Clipped piece 7
The tip of the flat rubber 1 is pressed against the upper surface of the sewing table 2 by the tip plate stopper 3 and temporarily fixed.

The moving position of the tip plate stopper 3 is the flat rubber 1 clamped by this.
is determined below the sewing press piece 6 so that the sewing press piece 6 can be attached with the descending sewing press piece.

(2) As shown in FIG. 8, the clamping piece 7 descends from the chain line position to the solid line position and clamps the flat rubber l to the sewing table 2. When the sewing press piece 6 descends, the tip plate stopper piece 3 advances from the lowered position of the sewing press piece 6 to the solid line position before the sewing press piece 6 comes into contact with it. Thereafter, the loop winding piece 4 rotates once to lightly wind the flat rubber 1 around the sewing table 2 and the adjustment rod 5 to form a loop. In this state, overlap the middle of the flat rubber over the tip of the flat rubber.

(2) As shown in FIG. 9, the sewing pressing piece 6 descends to press the overlapping portion against the sewing table 2, and the flat rubber of the jumper of the sewing pressing piece 6 is sewn.

■ As shown in Fig. 10, the pinching piece 7 rises and lifts one side of the flat rubber connected to the loop part, and then, as shown in Fig. 11, the sewing presser piece 6 rises and The middle of the flat rubber l is lightly clamped between the piece 7 and the sewing press piece 6. At this time,
Since the flat rubber l is sewn into a loop shape, it surrounds the sewing table 2 and the adjustment rod 5, and the sewn portion does not rise together with the sewing presser piece 6. In this state, the cutter 8
Then, cut the flat rubber at the bottom surface of the sewing press piece 6.

[Brief explanation of the drawing]

1 to 4 are schematic perspective views showing one embodiment of the present invention, FIGS. 5 and 6 are perspective views and side views showing an example of the apparatus used in the method of the present invention, and FIGS. 7 to 4 are schematic perspective views showing one embodiment of the present invention. 1st
FIG. 1 is a schematic sectional view showing a process in which the apparatus shown in FIGS. 5 and 6 connects flat rubber into a loop shape. l...Flat rubber, 2...Sewing table, 3...Tip plate stopper, 4...Loop winding piece, 5...Adjusting rod,
6. Sewing press piece, 7. Pincer piece, 8
... Cutter, 9. Sewing machine as above, 10. Cylinder, 11. Crank bin, 12. Flat rubber hole, 13. Crankshaft, 14. Motor, 15.
··container.

Claims (1)

[Claims] A step of forming a long flat rubber into a loop and overlapping the cut end in the middle of the flat rubber, then sewing the overlapped part of the tip of the flat rubber,
A method for connecting flat rubber into a loop, which comprises the step of sewing the flat rubber and then cutting the flat rubber that continues to the loop-shaped portion near the sewn portion.