JPH0629733U - Stroke switching device for punch-out kickout pin of header - Google Patents

Abstract

(57) [Summary] [Purpose] The stroke of the kickout pin can be changed in a short time. [Structure] A mounting plate 9 for mounting a plate cam is adapted to be reciprocally rotated within a fixed angle range in synchronization with the reciprocating motion of the ram 1. On the outer periphery of the plate cam 17, a kickout pin 24 is provided.
3 types of cam curve portions 26a to 26c having different lifts corresponding to the respective strokes are formed at intervals of 120 degrees. The plate cams 17 are selected and mounted by the tightening bolts 30 at positions displaced by 120 degrees in the rotational direction with respect to the mounting plate 9, and at each mounting position, the three cam curve portions 2 are provided.
Any of 6a to 26c corresponds to the roller 21 of the follower lever 19.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an apparatus for changing the forward / backward stroke of a kickout pin used for ejecting a molded work by inserting it into a molding hole of a punch of a header depending on the type of the work.

[0002]

[Prior art]

 As an example of a header that press-forms a work between a die and a punch mounted on a ram that moves forward and backward, a kit-out pin for ejecting the work after molding is inserted into the punch forming hole. In general, its cutout pin is engaged with a follower lever that is in contact with a plate cam that is driven in synchronization with the ram, and it is a retreat that abuts the tip of the work in the forming hole of the punch during forming. It is driven back and forth between the position and the forward position where the work after molding is projected to the front of the punch.

In such a header, when the type of the work to be formed is changed and the depth of the part of the work, such as the head, into which the work is inserted into the punch is changed, the punch can be replaced. In addition, it is necessary to change the advance / retreat stroke of the kickout pin according to the depth of the work to be inserted into the punch.

[0004]

[Problems to be solved by the device]

 Conventionally, as a means for changing the advance / retreat stroke of such a kickout pin, a stroke adjusting device is provided to adjust the stroke, or a plurality of cam curves of different lifts are formed corresponding to respective strokes. Although a method of preparing a plate cam of each kind in advance and replacing the plate cam each time has been adopted, both of them have a drawback that it takes a lot of time and trouble to perform the setup change and the production efficiency is lowered.

[0005]

Means for Solving the Problems A stroke switching device for a punch-side kickout pin of a header according to the present invention has been devised in view of the above points, and is connected to a drive portion of a ram to rotate around an axis. In addition to providing a mounting plate that can be reciprocally rotated within a certain angle range, a plate cam that has a plurality of cam curved portions with different lifts formed at substantially equal angular intervals is provided, and the plate cam is coaxial with the mounting plate. The mounting position in the rotation direction above can be changed so that each cam curve of the plate cam can be selectively associated with the follower lever.

[0006]

[Action]

 When the ram reciprocates, the mounting plate and the plate cam attached to it reciprocally rotate in a certain angle range in synchronization with it, and the follower lever moves in accordance with the lift of the one cam curved portion with which it abuts. The kickout pin that swings at an angle and engages with it moves back and forth with a constant stroke corresponding to the depth of the part of the work that is inserted into the punch.

When the type of the work to be formed changes and the depth of the part where the work is inserted into the punch changes, loosen the plate cam attachment and rotate it around the axis to insert a new work insertion depth. Change the mounting position with respect to the mounting plate so that another cam curved part with a lift corresponding to that corresponds to the follower lever.

As a result, the follower lever oscillates at a constant angle corresponding to the lift of the changed cam curve portion, and the kickout pin moves back and forth with a stroke corresponding to the depth of the portion where a new workpiece is inserted into the punch. .

[0009]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS. In FIG. 1, reference numeral 1 is a ram having a punch 2 mounted on a surface corresponding to a die (not shown), and an eccentric shaft 5 provided at an eccentric position with respect to the drive shaft 3 and rotated around the drive shaft 3, The connecting shaft 6 protruding from the ram 1 is connected by a link 7, and the link 7 is driven back and forth while swinging in accordance with the rotational movement of the drive shaft 3, whereby the ram 1 becomes a linear guide (not shown). It reciprocates in the direction toward and away from the die.

A mounting plate 9 for mounting a plate cam as shown in FIG. 2 is rotatably fitted on the support shaft 10 diagonally above the connecting shaft 6 on the ram 1, and the outer periphery of the mounting plate 9 is The connecting portion 11 projecting on the link 7 and the linking portion 12 projecting on the link 7 are linked by the arm 15 via the pin 13, and with the swinging motion of the link 7, the mounting plate 9 is It is adapted to be reciprocally rotated about the supporting shaft 10 within a constant angle range.

A plate cam 17, which will be described in detail later, is mounted on the support shaft 10 on one surface side of the mounting plate 9, and a shaft 18 provided near the support shaft 10 is mounted on the support shaft 10. The follower lever 19 is swingably supported, and one piece 19a of the lever 19 is pressed by the compression coil spring 20 to apply a swinging force in the time direction of FIG. The roller 21 axially supported by the tip of the piece 19b is adapted to be pressed against a fixed position on the outer periphery of the plate cam 17, and the engaging member fitted on the tip of the piece 19a of the lever for receiving the above spring force. 22 corresponds to the rear end of the kickout pin 24 inserted into the forming hole 2a of the punch 2 so as to be able to hit.

As shown in detail in FIG. 3, the above-described plate cam 17 has three outer circumferences having different radii due to the same radius of the large diameter portion and different radius of the small diameter portion. The cam curve portions 26a to 26c are formed at intervals of 120 degrees.

On the surface of the plate cam 17, three insertion holes 28 are provided at intervals of 120 degrees, and on the surface of the mounting plate 9, two insertion holes 28 are formed at the same angular intervals as shown in FIG. The screw holes 29 are formed correspondingly, and by tightening the tightening bolts 30 into the arbitrary two insertion holes 28 of the plate cam 17 and screwing them into the screw holes 29 of the mounting plate 9, So that any one of the three cam curved portions 26a to 26c corresponds to the roller 21 of the follower lever 19, that is, the three mounting positions deviated by 120 degrees in the rotational direction. I'm running.

The present embodiment has such a structure, and its operation will be described below. The solid line in FIG. 1 shows the state in which the ram 1 is at the rear end position, and the roller 21 of the follower lever 19 abuts between the small diameter portion and the large diameter portion of the cam curve portion 26a of the plate cam 17 having the largest lift. There is.

When the ram 1 is reciprocated from this state, the mounting plate 9 and the plate cam 17 are rotated from the position I to the position II and then returned to the position I side again in the forward movement of the ram 1. When it reaches the front end position, it takes the position I, and in the backward stroke, when it reaches the position IV through the position III and then returns to the position I, it is rotationally driven by the route.

With the rotation of the plate cam 17, the roller 21 of the follower lever 19 moves on the small diameter portion of the cam curved portion 26a in the forward movement of the ram 1 and stays at the solid line position in FIG. During the stroke, the roller 21 climbs up from the inclined portion of the cam curved portion 26a to the large diameter portion, the follower lever 19 swings to the chain line position in the figure, and the follower lever 17 moves when the ram 1 returns to the rear end position. It swings back to the solid line position again.

That is, when the ram 1 moves forward to press the work between the punch 2 and the die opposite thereto, the follower lever 19 swings to the position indicated by the solid line. As shown by the solid line in the figure, the tip of the work is retracted to the retracted position where the tip aligns with the inner surface of the forming hole 2a of the punch 2, and the head of the workpiece fitted in the forming hole 2a of the punch 2 is abutted. As the ram 1 moves backward, the follower lever 19 swings to the chain line position, so that the pickout pin 24 advances to the forward position reaching the front of the punch 2 and presses the head, as shown by the chain line. Then, the molded work is projected to the front of the punch 2.

As described above, in synchronization with the reciprocating motion of the ram 1, the kickout pin 24 moves forward and backward with a constant stroke corresponding to the depth of the work head inserted into the punch 2.

When the type of the work to be formed changes and the depth of the work head changes, the punch 2 is changed to the corresponding one, while the tightening bolt 30 is loosened to support the plate cam 17 on the support shaft. Rotate about 10 times and change the mounting position to the mounting plate 9 so that another cam curve part 26b or 26c with a lift corresponding to the depth of the new work head corresponds to the roller 21 of the follower lever 19. Then, the tightening bolt 30 is tightened and fixed.

As a result, the follower lever 19 swings at a constant angle corresponding to the lift of the changed cam curved portion 26b or 26c, and the kickout pin 24 moves to the depth of insertion of the new work head into the punch 2. Move back and forth with the corresponding stroke.

[0021]

[Effect of device]

 As described above, according to the present invention, when the type of the work to be formed is changed and the depth of the part of the work to be inserted into the punch is changed, the stroke of the kickout pin is changed. , It is only necessary to rotate the plate cam around the axis and change the mounting position so that the cam curved part with the lift corresponding to the new work insertion depth corresponds to the follower lever, that is, setup change. Can be done in a short time, which has the effect of increasing production efficiency.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view of an embodiment of the present invention.

FIG. 2 is an enlarged front view of a mounting plate.

FIG. 3 is an enlarged front view of a plate cam.

[Explanation of symbols]

1: Ram 2: Punch 2a: Forming hole 3: Drive shaft
5: Eccentric shaft 6: Connecting shaft 7: Link 9: Mounting plate 10: Mounting shaft 15: Arm 17: Plate cam 19: Follower lever 21: Roller 22: Engaging member 24: Kickout pin 26a to 26c: Cam curve portion 28 : Insertion hole 29: Screw hole 30: Tightening bolt

Claims (1)

[Scope of utility model registration request] 1. A kickout pin is inserted into a forming hole of a punch mounted on a ram that reciprocates in the direction of contacting and separating from the die on the front surface of the die, and the kickout pin is driven in synchronization with the ram. By engaging the follower lever that is in contact with the plate cam, the retracted position where the tip of the work is abutted in the forming hole of the punch during the forming of the work, and the forward position where the formed work is projected to the front surface of the punch. In a header adapted to be driven back and forth between, a device for switching the stroke of the kickout pin, wherein a mounting plate connected to the drive part of the ram and reciprocally rotated about an axis in a constant angle range is provided. A plate cam having a plurality of cam curved portions having different lifts formed at substantially equal angular intervals is provided, and the plate cam is rotated coaxially with the mounting plate. Mounted for changing the mounting position of the direction, the stroke switching device of the punch side tight click-out pin Hetsuda, characterized in that each of said cam curve portion of the plate cam has a structure which selectively correspond to said Fuorowareba.