JPH0419017B2 - - Google Patents

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 flat rubber whose surface is covered with stretchable fabric. That is, flat rubber has the advantage that the maximum amount of elongation is limited by the fabric on the surface and no excessive tensile force is applied to the rubber, and is often used in high-end products.

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 bartack 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 the position is kept at a distance of, for example, 10 to 20 mm from the leading edge, it will not be possible to overlap both ends accurately without misalignment 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 even though it is difficult to accurately overlap both ends of thin flat rubber, even the slightest positional deviation makes it impossible to overlap each other. For this reason, the thinner the flat rubber is, the more difficult it is to accurately position it, the more accurately it is necessary to overlap it, 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 folded state in a container, it has a tendency to bend at the bent portion. If the bent end becomes the cut end, no matter how much the positional accuracy of the holding member is improved, it will not be possible to accurately overlap both 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 high-quality rubber with little deformation has a width of 6 mm or more, and low-quality rubber has a width of 10 to 13 mm. I can't even use it.

For this reason, the reality is that a worker looks at each thin flat rubber piece at first glance and manually sews it into a loop shape. The work of manually sewing flat rubber into a loop shape requires more advanced technology as the flat rubber becomes thinner, and has the drawback of low 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 thin flat rubber bands that could not be sewn into a loop shape using conventional methods, and to create a loop-shaped flat rubber band that can be sewn securely and firmly without shifting the position of the connecting part. Provides a way to connect.

[Means for solving the conventional problems] The method of connecting flat rubber pieces in a loop shape according to the present invention is as follows:
A process of making a long flat rubber into a loop and overlapping the cut end halfway through the flat rubber, then sewing the overlapping part of the flat rubber tip, and sewing the flat rubber that continues to the looped part after sewing. It consists of a step of cutting in the vicinity of the part.

[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 into a loop-shape and then cutting it, instead of the conventional method in which flat rubber is cut into a certain length, then formed into a loop, and both ends are connected. are doing. A specific example is to temporarily fix the tip of a flat rubber 1 as shown in FIG. 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 material has a tendency to deform and bend 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 uses thin flat rubber, which could not be sewn into a loop shape using conventional methods, and
Achieve the outstanding effect of reliable and strong connection.

Incidentally, in experiments conducted by the present inventor, it was possible to accurately connect approximately 500 extremely thin flat rubber pieces with a width of 4 mm in an hour with a lateral positional deviation of less than 1 mm.

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 possible to efficiently and inexpensively mass-produce thin flat rubber loops, which were conventionally 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 1 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,
Loop the middle of the flat rubber 1 into the flat rubber hole 12 at the tip of the winding piece.
Insert it into. As shown in Figures 2 and 8, the looped piece 4 is rotated once, the flat rubber 1 is lightly wrapped around the two adjustment rods 5 for adjusting the length, and the sewing table 2, and then temporarily secured. Lay it over the cut end to form a loop.

As shown in FIG. 3, the overlapping portions are sewn together and connected into a loop before cutting the flat rubber 1. After the loop is sewn, as shown in FIG. 4, the flat rubber 1 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 distance between the two adjustment rods 5 or the lower they are from the sewing table 2, the larger the loop becomes. In order to reduce the error in the size of the connected loops, when winding the flat rubber into a loop as shown in Figure 2, the loop is created by pulling it with such force that the flat rubber 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 for the flat rubber 1 shown in FIGS.
, a tip temporary fixing piece 3 that presses and temporarily fixes the tip of the flat rubber 1 to the sewing table 2, a loop winding piece 4 that makes the flat rubber 1 into a loop, and a flat rubber 1 made from the loop winding piece 4.
an adjustment rod 5 that adjusts the size of the loop; a sewing presser piece 6 that presses the sewn portion of the overlapping flat rubber 1; and the sewn portion of the flat rubber 1 is sandwiched between the sewing presser piece 6. A clip 7, a cutter 8 for cutting the flat rubber 1 sandwiched between the clip 7 and the sewing pressing piece 6, and a bar tack sewing machine 9 for sewing the flat rubber pressed by the sewing pressing piece 6.
It is equipped with

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 temporary fixing piece 3 is fixed to the tip of the rod of the cylinder 10, and is moved by the cylinder 10 along the upper surface of the sewing table 2 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,
A flat rubber hole 12 into which the flat rubber 1 is movably inserted is bored at the tip of the crank pin 11, and the crankshaft 13 is formed into a cylindrical shape through which the flat rubber 1 is pulled out. When this rotates around the crankshaft 13, the flat rubber 1 is wound into a loop shape surrounding the sewing table 2. Therefore, the length of the crank arm and the position of the crankshaft are adjusted so 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 gears, pulleys, and belts.
It is also rotated by the motor 14 and a loop is made with the flat rubber 1.

By the way, in the apparatus shown in FIG. 6, the container 15 for supplying the flat rubber 1 to the looped piece 4 also rotates together with the looped piece 4 to prevent the flat rubber 1 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 horizontally and parallel to each other below the sewing table 2. Although not shown, the width of the two adjusting rods 5 can be adjusted freely, or they can be moved up and down and fixed so that the size of the loop can be adjusted.

The sewing press 6 presses the flat rubber 1, which has been 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, so that they can be connected vertically. It is movably 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 to be vertically movable separately from the sewing pressing piece 6.
The distance between the pinching piece 7 and the sewing pressing piece 6 is adjusted so that the tip of the cut flat rubber 1 can be lightly pinched there.

The cutter 8 cuts the flat rubber 1 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 bartack sewing machine 9 that can sew flat rubber 1 stacked on top of each other 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.

As shown in FIG. 1, the flat rubber 1 with its tip cut off is held by being held between the clip 7 and the sewing pressing piece 6. In this state, the tip temporary fixing piece 3 moves along the upper surface of the sewing table 2 from the solid line position to the chain line position. At this time, the tip temporary fixing piece 3 is attached to the flat rubber 1 at the front edge.
When moving forward by pulling the sewing press piece 6, the sewing press piece 6 rises a little and releases the pinched state with the pinch piece 7, and the flat rubber 1
The tip of the clip 7 and the sewing press piece 6 that were clamped are
The tip of the flat rubber 1 is pressed against the upper surface of the sewing table 2 by the tip temporary fixing piece 3 and temporarily fixed.

The moving position of the tip temporary fixing piece 3 is determined to be below the sewing press piece 6 so that the tip of the flat rubber 1 clamped by this can be clamped by the descending sewing press piece.

As shown in FIG. 8, the clip 7 descends from the chain line position to the solid line position and clamps the flat rubber 1 to the sewing table 2. When the sewing presser piece 6 descends, the tip temporary fixing piece 3 advances from the lowered position of the sewing presser piece 6 to the solid line position before the sewing presser 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.

As shown in FIG. 9, the sewing pressing pieces 6 descend to press the overlapped portions against the sewing table 2, and the flat rubber between the sewing pressing pieces 6 is sewn.

As shown in FIG. 10, the pinching piece 7 rises to lift one side of the flat rubber connected to the loop part, and then, as shown in FIG. 11, the sewing pressing piece 6
is raised, and the flat rubber 1 is held by the pinching piece 7 and the sewing pressing piece 6.
Lightly pinch in the middle. At this time, since the flat rubber 1 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 cuts the flat rubber at the lower surfaces of the pinching piece 7 and the sewing pressing piece 6.

[Brief explanation of drawings]

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. FIG. 11 is a schematic sectional view showing a process in which the apparatus shown in FIGS. 5 and 6 connects flat rubber pieces into a loop shape. 1... Flat rubber, 2... Sewing table, 3... Tip temporary fixing piece, 4... Loop winding piece, 5... Adjustment rod, 6...
...Sewing press piece, 7...Pinch piece, 8...Cutter, 9...
...Bartack sewing machine, 10...Cylinder, 11...Crank pin, 12...Flat rubber hole, 13...Crankshaft, 14...Motor, 15...Container.

Claims (1)

[Claims] 1 A process of making a long flat rubber into a loop and overlapping the cut ends halfway through the flat rubber, then sewing the overlapping part of the tips of the flat rubber, and after sewing, sewing the flat rubber that continues to the looped part. A method of connecting flat rubber into a loop shape, which consists of a step of cutting near the wearing part.