JPS645972B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a folding device. More specifically, for example, when manufacturing a product by bending a wire at an angle of 90 degrees, the wire must be bent at an angle of 90 degrees or more because spring back occurs when the wire is bent. This invention relates to a bending device that bends wire rods at an angle of 90 degrees or more.

The details of the present invention will be explained with reference to the drawings.
The figure is a front view of the device of the present invention, and FIG. 2 is a sectional view taken along the line taken from FIG. 1. In FIGS. 1 and 2, an arm 1 is provided which swings by a drive device (not shown). The tip of arm 1 is bifurcated, and two types of plate cams are installed at the tip of arm 1.
The first plate cam 2a and the second plate cam 2b are fixed concentrically. Further, a hollow fixing block 3 is fixed to the main body 4 between the bifurcated parts at the tip of the arm 1. Furthermore, as shown in FIG. 3, the fixed block 3 is rotatable by the first plate cam 2a of the two types of plate cams with roller pins 5 installed on both legs protruding from the lower end. A sliding rod 7 that is moved up and down via a roller 6, and a second
Push-up rods 10 are provided adjacent to each other and move up and down via rollers 9 which are rotatable by roller pins 8 pivotally supported at their lower ends by plate cams 2b. Further, a recess 7a is formed in the upper part of the sliding rod 7, and the recess 7a
The actuating body 12 is swingably held by pivot pins 11 installed on both legs of the actuating body 12. Further, a tension spring 14 is stretched between a spring hook 12a projecting from the actuating body 12 and a spring hook 13 projecting from the fixed block 3.
Further, the actuating body 12 is provided with an adjusting pin 15 for adjusting the swinging position (counterclockwise position in the figure) between the actuating member 12 and the sliding rod 7. Furthermore, a notch 7b is provided at the bottom of the recess 7a at the top of the sliding rod 7, and is engaged with a stop pin 16 provided on the fixed block 3. That is, the sliding rod 7 is moved by the first plate cam 2a.
is raised and located at the top end, the notch 7b
is installed so that the lower surface 7c of the stop pin 16 comes into contact with the stop pin 16. On the other hand, a push-up pin 17 is adjustably provided on the actuating body 12 facing the upper surface of the push-up bar 10, and when the push-up bar 10 is raised by the second plate cam 2b, the actuating body 12 is adjusted via the push-up pin 17. Rotating pin 1
Oscillating movement around 1 (clockwise in the figure)
It will be provided so that In addition, 18 is a holding part that holds the material, and a bending tool 19 is fixed to the actuating body 12 that rises as the sliding rod 7 moves upward.
The tip of the holding portion 18 is positioned so as to move up and down.

The present invention is constructed as described above, and the operational state of bending the material will be explained with reference to side partial cross-sectional views of FIGS. 4 to 6. In the following embodiments, a case will be explained in which a wire rod is bent at 90 degrees. First, the holding portion 18 holds the wire rod and is positioned at a predetermined position. The device of the present invention starts operating from this state. When the wire rod is positioned above the device of the present invention, the arm 1 is then swung by the drive device, and the first plate cam 2 fixed to the arm 1 is rotated.
The mountain part a pushes up the roller 6. Therefore, as shown in FIG. 4, the first plate cam 2a moves the sliding rod 7 upward via the roller 6, and is swingably attached to the upper part of the sliding rod 7 with a rotation pin 11. The actuating body 12 will also move upward. At this time, the actuating body 12 connects the spring hook 12a to the tension spring 14 hooked to the spring hook 13 protruding from the fixed block 3.
Therefore, the adjustment pin 15 is always in a fixed state where it is in contact with the bottom surface of the recess 7a at the top of the sliding rod 7 (the actuating body 12 is moved counterclockwise around the rotation pin 11 by the adjustment pin 15). (always tilted until the position is determined). Therefore, the bending tool 19 fixed to the actuating body 12 rises vertically and comes into contact with the wire held by the holding part 18 to bend the wire upward at right angles. (Figure 5) So now,
If the sliding rod 7 descends from this state and the bending action of the wire rod by the bending tool 19 is released, the wire rod bent at a right angle will return to its state a little due to spring back, and the bending angle will become an obtuse angle. . Therefore, in anticipation of the occurrence of spring back, it is necessary to further bend the wire at an acute angle by the amount of spring back expected from the state shown in FIG.
Then, the arm 1 further swings and the second plate cam 2
The mountain part b pushes up the roller 9 and pushes up the push-up bar 10.
move upward. Then, as shown in FIG. 6, the push-up bar 10 is moved upward, and the actuating body 1
2 is swung by the push-up pin 17 against the tension spring 14. At this time, when the sliding rod 7 is moved upward to the uppermost position by the mountain portion of the first plate cam 2a mentioned above and the wire rod is bent at right angles with the bending tool 19, Notch 7b
The lower surface 7c is configured to come into contact with a stop pin 16 provided on the fixed block 3 to limit the upward movement of the sliding rod 7, so that the actuating body 12
0 through the push-up pin 17, the sliding rod 7 is locked by the stop pin 16, so the actuating body 12 does not move upward together with the sliding rod 7 through the rotation pin 11. Therefore, operating body 1
2 swings clockwise around the pivot pin 11. Therefore, when the wire rod is bent at right angles as shown in FIG. 5, the bending tool 19 tilts toward the holding part 18 due to the clockwise rocking of the actuator 12, and as a result, the springback is caused. The wire is bent at an extra acute angle. (FIG. 6) After that, by swinging the arm 1 in the opposite direction to that described above, the first plate cam 2a
The push-up by the peaks of the second plate cam 2b is released, and the slide rod 7 and push-up bar 10 move downward, returning to the state shown in FIG. 4. At that time bending tool 1
The wire rod bent at an acute angle by step 9 undergoes springback, and the wire rod is bent just at a right angle, resulting in a wire rod formed into the required right-angle bend.

Incidentally, a cam timing diagram of the plate cams 2a and 2b is shown in FIG.

Further, the inclination angle of the actuating body 12 for bending the wire at an acute angle by the spring back is adjusted by adjusting the position of the push-up pin 17. Further, adjustment when the bending tool 19 moves up and down on the front surface of the holding part 18 when the actuating body 12 moves upward is performed by the adjustment pin 15. Although the present invention has been shown and explained using an example in which a wire rod is bent at a right angle, it is also possible to bend not only a wire rod but also a material such as a band material. It is obvious that it can be used.

As explained above, when bending wire rods or strips, the bending angle of the product is usually smaller by the angle due to the spring back than the bending angle by the manufactured mold, and when bending the material to 90° or more than 90° Because the mold was configured to work in two or more processes and used a mold with a complicated mechanism, there were many failures, and the cost of manufacturing the mold was high.In addition, the mold had to be manufactured each time the bending angle was different. However, the device of the present invention has a simple mechanism, and even if the bending angle is different, the bending angle can be freely changed easily and in a short time by simply adjusting the adjustment pin push-up pin. effective.

[Brief explanation of drawings]

FIG. 1 is a front view of an embodiment of the apparatus of the present invention. FIG. 2 is a cross-sectional view taken from FIG. 1. FIG. 3 is an enlarged sectional view of the main part. 4 to 6 are side partial sectional views showing the folding operation state. FIG. 7 is a cam timing diagram of the plate cam. 1...Arm, 2a, 2b...Plate cam, 7...
Sliding rod, 10... Push-up bar, 11... Rotating pin, 1
2... Operating body, 15... Adjustment pin, 16... Stop pin, 17... Push-up pin, 18... Holding part,
19...Bending tool.

Claims (1)

[Claims] 1. A device that bends a material at a set angle, which includes a holding part that holds the material, an arm that swings, a first plate cam, a second plate cam, and a first plate cam that are fixed concentrically to the arm. A sliding rod that is moved up and down by a plate cam, an actuating body that is swingably provided at the upper end of the sliding rod, a tension spring that is provided between the actuating body and a fixed block, and a sliding rod that is fixed to the actuating body. A bending tool that moves up and down to cross the tip of the holding part, a push-up bar that is moved up and down by a second plate cam to push up one end of the actuating body, and a stop pin provided on a fixed block that limits the upward movement of the sliding bar. A bending device that allows a push-up bar to move upward following the actuating body by swinging the arm, thereby bending the material held by the holding part beyond a set angle using a bending tool fixed to the actuating body. .