JP2558042Y2 - Stroke switching device for kickout pin on the punch side of the header - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for changing a stroke of a kick-out pin used for projecting a formed work by inserting the work into a forming hole of a punch of a header according to the type of the work.

[0002]

2. Description of the Related Art As an example of a head for performing forging work on a work between a die and a punch mounted on a ram that moves forward and backward in front of the die, a kickout pin for projecting the formed work into a forming hole of the punch is provided. An insert type is known, and its kickout pin is generally engaged with a follower lever abutting a plate cam driven in synchronization with the ram, and the tip of the work is formed in the forming hole of the punch at the time of forming. Is driven between a retracted position at which the workpiece is abutted, and an advanced position at which the formed work is projected to the front surface of the punch.

[0003] In such a header, when the type of the work to be formed is changed and the depth of the portion of the work such as the head that fits into the punch changes, the punch is replaced. Therefore, it is necessary to change the stroke of the kick-out pin in accordance with the fitting depth of the work into the punch.

[0004]

Conventionally, as a means for changing the forward / backward stroke of the kickout pin, a means for changing the stroke of the kickout pin by interposing a stroke adjusting device,
Alternatively, a method has been adopted in which a plurality of types of plate cams each having a different lift cam curve corresponding to each stroke are prepared in advance, and the plate cams are replaced each time. In the past, there was a disadvantage that production efficiency had to be reduced.

[0005]

SUMMARY OF THE INVENTION A stroke switching device for a punch side kickout pin of a header according to the present invention is devised in view of the above points, and is connected to a driving portion of a ram to rotate around a shaft. A mounting plate that is reciprocated in a fixed angle range is provided, and 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 coaxially mounted on the mounting plate. In this configuration, the mounting position in the rotation direction can be changed, and each cam curve of the plate cam is selectively made to correspond to the follower lever.

[0006]

When the ram reciprocates, the mounting plate and the plate cam mounted on the ram are reciprocally rotated within a certain angle range in synchronization with the reciprocating movement. Accordingly, the kickout pin engaged with the rocker moves forward and backward with a constant stroke corresponding to the depth of a portion where the work is inserted into the punch.

When the depth of the portion of the work to be inserted into the punch changes due to a change in the type of the work to be formed, the plate cam is loosened and rotated about the axis to insert a new work. The mounting position with respect to the mounting plate is changed so that another cam curved portion having a lift corresponding to the following corresponds to the follower lever.

As a result, the follower lever swings at a fixed angle corresponding to the lift of the changed cam curve portion, and the kickout pin moves forward and backward with a stroke corresponding to the depth of the portion where the new work fits into the punch.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. In FIG. 1, reference numeral 1 denotes 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 a 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 with the rotational movement of the drive shaft 3, so that the ram 1 is moved to a linear guide (not shown). It reciprocates along the direction of coming and going along the die.

[0010] Above the connecting shaft 6 on the ram 1,
A mounting plate 9 for mounting a plate cam as shown in FIG.
And a connecting portion 11 protruding from the outer periphery of the mounting plate 9 and a connecting portion 12 protruding from the link 7.
Are connected by an arm 15 via a pin 13 so that the mounting plate 9 can be reciprocated around the support shaft 10 within a certain angle range with the swinging movement of the link 7 described above.

On one surface of the mounting plate 9, the support shaft 1 is mounted.
In FIG. 2, a plate cam 17 to be described later is attached in detail. A follower lever 19 is supported by a shaft 18 provided near the support shaft 10 so as to swing freely. Compression coil spring 20
1 is urged to the follower lever 19 by the pressing force of the lever 19, and the roller 21 pivotally supported at the tip of the other piece 19b of the lever 19 is pressed to a fixed position on the outer periphery of the plate cam 17. The engaging member 22 fitted to the tip of the piece 19a of the lever receiving the spring force corresponds to the rear end of the kickout pin 24 inserted into the forming hole 2a of the punch 2. ing.

As shown in detail in FIG. 3, the above-described plate cam 17 has three lifts having different lifts by changing the radius of the small-diameter portion while maintaining the same radius at the large-diameter portion. The cam curved 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, as shown in FIG. Screw hole 2
9 is formed correspondingly, and the plate cam 17 is screwed into any two through holes 28 of the plate cam 17 and screwed into the screw holes 29 of the mounting plate 9 so that the plate cam 17 becomes 3 One of the two cam curved portions 26 a to 26 c is a position corresponding to the roller 21 of the follower lever 19, and
It is designed to be selectively mounted at three mounting positions shifted by 20 degrees.

This embodiment has such a structure, and its operation will be described below. The solid line in FIG. 1 shows a 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. .

When the ram 1 is reciprocated from this state,
In the forward travel, the mounting plate 9 and the plate cam 17 rotate from the position I to the position II, return to the position I again, and take the position I when the ram 1 reaches the front end position. When the vehicle reaches the position IV through the position III and returns to the position I again, it is rotationally driven along the same path.

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 curve portion 26a during the forward movement of the ram 1, stays at the solid line position in FIG. In the stroke, the roller 21 is moved to the cam curved portion 26a.
Of the follower lever 19
When the ram 1 returns to the rear end position, the follower lever 17 returns to the solid line position again.

That is, when the ram 1 moves forward and presses the work between the punch 2 and the opposing die,
As the follower lever 19 swings to the solid line position, the tip of the kickout pin 24 is retracted to the retracted position where the tip thereof is aligned with the inner surface of the forming hole 2a of the punch 2 as shown by the solid line in FIG. When the head of the work inserted into the forming hole 2a of the punch 2 is abutted, and the follower lever 19 swings to the position of the chain line while the ram 1 is retreating,
The kickout pin 24 is connected to the punch 2 as shown by a chain line.
Then, the formed work is pushed out to the front surface of the punch 2 by pushing the head and pressing the head.

As described above, in synchronization with the reciprocating movement of the ram 1, the kickout pin 24 advances and retreats at a constant stroke corresponding to the fitting depth of the work head into the punch 2.

When the depth of the head of the work changes due to the change of the type of the work to be formed, the punch 2 is changed to the corresponding one while the tightening bolt 30 is loosened to release the plate cam 1.
7 is rotated about the support shaft 10, and the other cam curved portion 26 b or 26 c having a lift corresponding to the depth of the head of the new work is moved to the mounting plate 9 so as to correspond to the roller 21 of the follower lever 19. The mounting position is changed, and the tightening bolt 30 is tightened and fixed.

As a result, the follower lever 19 swings at a fixed angle corresponding to the lift of the changed cam curve portion 26b or 26c, and the kickout pin 24 moves to a position where the head of the new work fits into the punch 2 at the depth. Go back and forth with the corresponding stroke.

[0021]

As described above, according to the present invention, the reciprocating stroke of the kickout pin is changed in accordance with the change in the type of the work to be formed and the change in the depth of the portion where the work is inserted into the punch. In this case, it is only necessary to rotate the plate cam around the axis and change its mounting position so that the cam curved portion having a lift corresponding to the insertion depth of the new work corresponds to the follower lever, that is, There is an effect that the setup can be changed in a short time and the production efficiency can be increased.

[Brief description of the 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 curved portion 28 : Insertion hole 29: Screw hole 30: Tightening bolt

Claims (1)

(57) [Scope of request for utility model registration] 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 a follower lever in contact with a plate cam, a retracted position at which the front end of the work abuts in the forming hole of the punch at the time of forming the work, and a forward position at which the formed work is protruded to the front surface of the punch. A device for switching the reciprocating stroke of the kick-out pin, wherein the mounting plate is connected to a driving portion of the ram and reciprocally rotates in a predetermined angle range around an axis. 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.