JPH10249450A - Punch holding device in press die - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remove the punch and a spring seat member from a retainer main body without interference by a select bar by making small the necessary displacement quantity of the select bar changing over the punch to punchable position or to unpunchable position and to contrive the miniaturization of the subject device. SOLUTION: The punch 3 is energized toward the unpunchable position by a spring 11. By making the select bar 13 advance to the back of the head part 3c with a large diameter of the punch 3 by a cylinder device 15 fixed on the retainer main body 4, the punch 3 is set in the punchable position. In a prescribed withdrawing position which becomes the unpunchable position, the tip of the select bar 13 is positioned in the elongated locus of a spring seat member 9 in the punch axial direction. The select bar 13 is made separable in a connecting pin part which becomes a connecting portion to a cylinder device 15, and is made removable from the upside of the retainer main body 4. The select bar 13 can be made oscillatable so that its tip directs upward around the connecting pin as an oscillating fulcrum taking the place of the connecting pin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a punch holding device for a press die in which a select bar is reciprocated by an actuator to switch a punch between a punchable position and a non-punchable position. is there.

[0002]

2. Description of the Related Art Some punch holding devices in a press die are capable of switching a punch between a punchable position and a non-punchable position. That is, the punch is slidably held in the axial direction by a retainer attached to the press die, and is urged by a spring toward a non-punching position where the protruding length from the retainer is shortened. By changing the length of the protrusion of the punch from the retainer by reciprocating the select bar disposed on the base end face side of the punch, the punch can be switched between the punchable position and the non-punchable position. (For example, Japanese Utility Model Publication No. 3-4412, Japanese Utility Model Publication 4-21
609, and Japanese Utility Model Laid-Open No. 55-23283).
Usually, the retainer is configured so that it can be divided into a retainer main body holding a punch, a select bar, and an actuator, and a backing plate fixed to the upper surface of the retainer main body. .

[0003]

By the way, recently,
It is desired to reduce the size of the punch holding device, and particularly to minimize the length of the select bar in the reciprocating direction. One way to satisfy such requirements is to reduce the amount of reciprocation of the select bar, that is, to shorten the actuator fixed to the retainer.

On the other hand, when the punch is replaced or the like, the punch and the spring seat member provided on the punch are attached to and detached from the retainer main body from the upper surface side of the retainer main body with the backing plate removed from the retainer main body. Will be done. In this case, if the select bar is located in the extension trajectory of the spring seat member having a larger diameter than the punch in the punch axis direction, the select bar becomes an obstacle, and the punch and the spring seat member are retained. It becomes impossible to remove or attach from the top side of the main body. That is, the select bar is required to be set so as to deviate from the extension trajectory of the spring seat member in the punch axis direction at the predetermined retreat position corresponding to the non-punchable position. There was a limit in reducing the reciprocating displacement. There is no problem if the select bar is removed from the retainer body together with the actuator, but in this case, the actuator does not need to be removed.
It takes extra time to remove the motors one by one and then install the actuator again.

[0005] The present invention has been made in view of the above circumstances, and while reducing the reciprocating amount of the select bar and shortening the length of the select bar in the reciprocating direction,
It is an object of the present invention to provide a punch holding device for a press die in which a punch or a spring seat member can be detached and attached from an upper surface side of a retainer main body without detaching an actuator one by one.

[0006]

In order to achieve the above object, the present invention has a first solution as follows. That is, the punch is slidably held in the axial direction by a retainer attached to the press die, and is urged by a spring toward a non-punching position where the protruding length from the retainer is shortened. A press that switches between a punchable position and a non-punchable position by changing the length of the punch protruding from the retainer in accordance with the reciprocating motion of a select bar disposed on the base end face side of the punch. In a punch holding device for a mold, the retainer includes a retainer main body and a backing plate fixed to an upper surface of the retainer main body, and the punch and the backing plate are detached from the retainer main body. The spring spring seat member provided on the punch is detached from the upper surface side of the retainer main body, and is attached to the punch. A guide groove is formed in the retainer main body so as to open on the upper surface of the retainer main body, and an actuator for reciprocatingly driving the select bar is fixed to the retainer main body. The base end of the bar is connected to the drive shaft of the actuator so as to be disengageable from the axial direction of the punch, and the actuator sets the select bar to a predetermined retreat position so that the punch is moved. When the non-punchable position is set, the select bar is set so as to be located within the extension trajectory of the spring seat member in the punch axis direction, and the backing plate is removed from the retainer main body. By displacing the select bar upward as a whole, the select bar is released from engagement and connection with the drive shaft of the actuator. It is as being removable from said retainer body Te. Preferred embodiments based on the above solution are as described in claims 2 to 5 in the claims.

In order to achieve the above object, the present invention is as follows as a second solution. That is, the punch is slidably held in the axial direction by a retainer attached to the press die, and is urged by a spring toward a non-punching position where the protruding length from the retainer is shortened. A press that switches between a punchable position and a non-punchable position by changing the length of the punch protruding from the retainer in accordance with the reciprocating motion of a select bar disposed on the base end face side of the punch. In a punch holding device for a mold, the retainer includes a retainer main body and a backing plate fixed to an upper surface of the retainer main body, and the punch and the backing plate are detached from the retainer main body. The spring spring seat member provided on the punch is detached from the upper surface side of the retainer main body, and is attached to the punch. Guide groove for sliding guide is so as to be opened are formed on the retainer body on an upper surface of the retainer body,
An actuator for reciprocating the select bar is fixed to the retainer main body, and a base end of the select bar has a tip end of the select bar facing upward with respect to a drive shaft of the actuator. When the select bar is set to a predetermined retreat position by the actuator and the punch is set to a non-punchable position, the select bar is moved to the spring seat in the punch axis direction. The select bar is set so as to be located within the extension trajectory of the member, and in a state where the backing plate is detached from the retainer main body, the select bar is swung so that the tip thereof is directed upward, whereby the select bar is turned. In the punch axis direction, the spring seat member is deviated from the extended trajectory. Preferred embodiments based on the above solution are as described in Claim 7 and the following claims.

[0008]

According to the first aspect of the present invention, at the predetermined retreat position of the select bar, which is the position where the punch cannot be punched, the select bar is set so as to be positioned within the extension locus of the spring seat member in the punch axis direction. In other words, since the retreat amount of the select bar is reduced, the actuator can be reduced accordingly, and the overall length of the select bar in the reciprocating direction can be sufficiently reduced. Also,
When removing or attaching the punch or spring seat member from the retainer body, it is sufficient to remove the backing plate and remove only the select bar from the retainer body, and the actuator itself may be fixed to the retainer body,
There is no problem in terms of workability.

According to the second aspect of the present invention, a pin member is used to secure the detachable connection between the select bar and the actuator drive shaft, and to correspond to the selectable position of the select bar requiring a large force. When pressing in the advance direction, it is possible to prevent an excessive force from acting on the pin member.

According to the third aspect, when the select bar is removed, the pin member remains on the retainer body side, so that a situation in which the pin member is inadvertently eliminated while minimizing the number of members to be removed is prevented. The above is preferable.

According to the fourth aspect, by using the connecting member, it is easy to adopt a connecting structure capable of engaging and disengaging the select bar and the drive shaft. According to the fifth aspect, the same effect as the effect according to the second aspect can be obtained.

According to the sixth aspect, at a predetermined retreat position of the select bar, which is a position where the punch cannot be punched, the select bar is set so as to be positioned within the extension locus of the spring seat member in the punch axis direction. Therefore, that is, since the retreat amount of the select bar is reduced, the actuator can be reduced accordingly, and the overall length of the select bar in the reciprocating direction can be sufficiently reduced. Also, when removing or attaching the punch or spring seat member from the retainer body, simply remove the backing plate and swing the select bar so that its tip is directed upward, and the actuator itself is attached to the retainer body. It may be fixed, and there is no problem in terms of workability. Furthermore, while the select bar is connected to the actuator,
That is, since it is held by the retainer main body, it is preferable to prevent the fall-off or loss.

According to the seventh aspect, the same effect as the second aspect can be obtained. According to the eighth aspect, the use of the connecting member facilitates the adoption of the swingable connecting structure between the select bar and the drive shaft, and obtains the same effect as the effect according to the second aspect. Can be.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, reference numeral 1 denotes an upper die of a press die, and a punch 3 is held on the upper die 1 via a retainer 2. The retainer 2 has a divided structure of a retainer body 4, a backing plate 5, and a side plate 6, and these 4 to 6 are integrated with each other by bolts.

A guide hole 7 is formed in the retainer body 4 and extends vertically. The upper portion of the guide hole 7 communicates with the guide hole 7 and a storage space 8 opened on the upper surface of the retainer body 4. The storage space 8 is covered with a backing plate 5. The punch 3 has a portion that slides in the guide hole 7 as an intermediate shaft portion 3a, a front end side of the intermediate shaft portion 3a as a punched portion 3b, and an upper portion of the intermediate shaft portion 3a than the intermediate shaft portion 3a. Is also a large diameter head 3c having a slightly larger diameter. And the guide hole 7,
Each of the intermediate shaft portion 3a and the large diameter head 3c has a circular cross-section, but the cross-sectional shape of the punched portion 3b is an irregular shape such as a substantially rectangular shape (see FIGS. 4 to 6).

A storage space 8 is provided in the intermediate shaft 3a of the punch 3.
And the spring seat member 9 is fitted without looseness (in an intermediate fit, relative displacement is not possible with a small external force), and the large diameter head 3c prevents the spring seat member 9 from coming off. In the retainer main body 4, a plurality (three in the embodiment) of spring storage recesses 10 extending in the vertical direction are formed at substantially equal intervals in the circumferential direction of the punch 3 so as to open to the bottom wall of the storage space 8. Return spring 11 arranged in each spring storage recess 10
Is in contact with the lower surface of the spring seat member 9, whereby the punch 3 is constantly urged upward.

An elongated guide groove 12 is formed on the upper surface of the retainer body 4 and the side plate 6 so as to extend substantially in the diameter direction of the punch and communicate with the storage space 8. The guide groove 12 is also a backing plate. 5 covered. A select bar (also referred to as a moving backing plate) 13 is slidably fitted in the guide groove 12. The lower surface of the distal end portion of the select bar 13 is formed with a tapered inclined surface 13a that is inclined away from the large-diameter head 3c of the punch 3 that extends upward in the axial direction of the punch 3.

The base end of the select bar 13 is connected to a drive shaft 15 of a cylinder device (for example, an air type or a hydraulic type) 15 as an actuator via a connecting mechanism 14 described later.
a. The cylinder device 15 is fixed to the side plate 6 by bolts 16.

The spring seat member 9 has a shape as shown in FIGS. That is, the spring seat member 9 has a thin plate-shaped first portion 9a and a thick second portion 9b that is raised above one side upper surface of the first portion 9a. , A through hole 9c into which the intermediate shaft portion 3a of the punch 3 is inserted is formed. On the side surface of the second portion 9b on the side of the through hole 9c, a second flat surface portion 9d extending parallel to the axis of the punch 3 is formed. The spring seat member 9 having the first portion 9a and the second portion 9b is a metal plate having a thickness corresponding to the second portion 9b,
For example, the upper surface of the iron plate is obtained by machining only the portion corresponding to the first portion 9a by machining, and at this time, the second flat surface portion 9d can be formed at the same time. The through-hole 9c can be formed before or after forming the first portion 9a and the second portion 9b.

The first flat surface portion 3 extending parallel to the axis of the punch 3 is formed by partially chamfering the side surface of the large-diameter head 3c of the punch 3 corresponding to the second flat surface portion 9d.
d is formed. When the spring seat member 9 is fitted until the first portion 9a abuts on the lower surface of the large-diameter head 3c so that the flat surfaces 3d and 9d are aligned with each other, the spring seat member 9 is brought into contact with the flat surfaces d and 9d. Due to the contact relation, the spring seat member 9 is positioned in the circumferential direction with respect to the punch 3.

The second portion 9b of the spring seat member 9 includes:
By notching a part thereof, a positioning recess (notch) 9 e extending in parallel with the axis of the punch 3 is formed. On the other hand, the retainer body 4 has positioning pins 17 as positioning projections corresponding to the positioning recesses 9e.
Has been fixed. The positioning pin 17 extends in parallel with the axis of the punch 3 and is press-fitted into a mounting hole 18 formed in the retainer main body 4 so as to open to the bottom wall of the storage space 8.

The diameter of the positioning pin 17 is such that it fits into the positioning recess 9e without play in the circumferential direction of the punch 3. As shown in FIG. 9, the positioning recess 9 e forms a gap L on the axis side of the punch 3 with respect to the positioning pin 17 in a predetermined assembled state as shown in FIGS. 1, 2, and 16. Is to have.
More specifically, the inner surface at the back of the positioning recess 9e is formed in an arc shape centered on the center O1, but in a predetermined assembled state, the center of the positioning pin 17 is closer to O1 than to the center O2. Is set to a position slightly offset toward the axis of the punch 3.

The connection mechanism 14 is shown in FIGS.
This will be described with reference to FIG. First, the base end of the select bar 13 is positioned rearward from its upper part, that is, the cylinder device 1.
A protrusion 13b protruding toward the fifth side is formed, and a connection hole 21 extending in the punch axis direction is formed on the protrusion 13b. On the other hand, the drive shaft 15 of the cylinder device 15
The screw portion 22a of the connecting member 22 is screwed and fixed to the distal end surface a. A mounting hole (connection hole) 23 extending in the punch axis direction is formed at the tip of the connection member 22.
The lower end of a connecting pin (pin member) 24 is fixed to the mounting hole 23 by press-fitting or the like. The upper end of the connecting pin 24 is loosely fitted into the connecting hole 21 formed in the select bar 13 (see FIG. 15). Thus, when the backing plate 5 is detached from the retainer main body 4, the select bar 13 can be removed from the retainer main body 4 by being displaced upward so as to be pulled out from the connecting pin 24. (See the dash-dot line in FIG. 16).

In the assembly completed state shown in FIG. 1, the drive shaft 15a of the cylinder device 15 is advanced to
Is advanced to the back surface of the large-diameter head 3b of the punch 3, so that the punch 3 is set to a punchable position where the protruding length of the punch 3 from the retainer 2 is increased. When the select device 13 is retracted from the rear surface of the large-diameter head 3b of the punch 3 by reducing the length of the cylinder device 15 from the state of FIG. 1 (see FIG. 16 for the retract position of the select bar 13), the punch 3 As a result, the displacement upward, that is, the protruding length from the retainer 2 is shortened, and the punching is disabled.

In the non-punching position as shown in FIG. 16, the select bar 13 is retracted from the extended locus of the large diameter head 3c of the punch 3, but is positioned within the extended locus of the spring seat member 10. To be. That is, when the retainer 2 is removed from the upper mold 1 and the backing plate 5 is removed from the retainer main body 4, and the punch 3 and the spring seat member 9 are pulled upward from the retainer main body 4, the selection bar 13 is left as it is. , The spring seat member 9 interferes. However, by removing the select bar 13 upward as shown by the dashed line in FIG. 16, the punch 3 can be pulled upward together with the spring seat member 9 from the retainer main body 4 without being disturbed by the select bar 13. Become. In addition, select bar 1
The retracted position of the select bar 3 can be moved backward sufficiently to a position where it does not interfere with the spring seat member 9, but in this case, the required displacement of the select bar 13 increases, that is, the cylinder device 15 However, the length becomes large in the axial direction, and the length in the left-right direction in FIG. 1 increases.

In order to assemble the punch 3 with the retainer 2 and attach it to the upper mold 1, first, the spring seat member 9 is placed on the punch 3 in a state where the flat surface portions 3d and 9d are aligned (contact). Prepare the fitted one. The punch 3 with the spring seat member 9 fitted into the retainer body 4 from which the backing plate 5 and the select bar 13 have been removed from the state shown in FIG. Insert. As the fitting of the punch 3 into the guide hole 7 progresses, the spring seat member 9 eventually receives a biasing force from the spring 11, and the positioning recess 9e is fitted to the positioning pin 17. . At this time, by the setting of the gap L shown in FIG. 9, the positioning concave portion 9e and the positioning pin 17 are smoothly fitted.

Thereafter, the select bar 13 is positioned in the guide groove 12 while the connection hole 21 is fitted to the connection pin 24. Thereafter, the backing plate 5 may be fixed to the retainer main body 4, and then the retainer main body 4 may be fixed to the upper mold 1. The removal of the punch 3 from the retainer 2 may be performed in a procedure reverse to that described above.

Here, when the select bar 13 is pressed toward the punchable position by the cylinder device 15, a larger force is required than when the select bar 13 is retracted toward the non-punchable position. In order to prevent a large force when selecting the punchable position from being applied to the connecting pin 24, for example, the connecting hole 21 formed in the select bar 13 is made longer than the diameter of the connecting pin 24. When the selection bar 13 is set slightly larger in the direction (the larger dimension is indicated by reference numeral L2 in FIG. 15) and the select bar 13 is pressed toward the punchable position, the select bar 13 is directly pressed by the connecting member 22. It is preferable that the pressing force is not applied to the connecting pin 24 toward the punchable position. For this reason, the connecting member 2
2 so that the front end portion can advance below the connection hole 21.
Below the projection 13b where the connection hole 21 is formed,
An escape space 25 in which the distal end of the connecting member 22 is located is formed.

FIGS. 17 to 19 show another method of connecting the select bar 13 and the cylinder device 15. The same components as those shown in FIGS. 1 to 16 are denoted by the same reference numerals. is there. That is, the connecting mechanism 14 has a connecting member 32 fixed to the drive shaft 15a of the cylinder device 15, and the connecting member 32 and the rear end of the select bar 13 are connected via a connecting pin 34 extending in a substantially horizontal direction. , Ie, the select bar 13 is connected to be swingable in the vertical direction. Thus, by swinging the select bar 13 at its retreat stroke end so that the distal end thereof is directed upward around the connecting pin 34, the punch 3 can be moved without being disturbed by the select bar 13. It can be removed from the retainer body 4 together with the spring seat member 9.

The connecting portion between the connecting member 32 and the select bar 13 will be described in more detail.
At the rear end, a pair of left and right bifurcated projections 36 and 37 are formed so as to form a clearance space 35 between them. The tip of the member 32 is located. And the connecting member 3
The connection pin 34 penetrates the connection hole 38 formed at the tip end of the connector 2, and each end of the connection pin 34 is connected to each of the protrusions 36 and 37.
And is fitted in the mounting hole 39. Preferably, the connecting pin 34 has a slight gap in the longitudinal direction of the select bar 13 with respect to the connecting hole 38 of the connecting member 32 so that the pressing force from the cylinder device 15 toward the punchable position is reduced. The transmission is made directly from the connecting member 32 to the select bar 13 without passing through the connecting pin 34 (see FIG. 19).

The return spring 11 is shown in FIG.
In FIG. 16, only the lower end portion is a large-diameter portion which is tightly fitted into the storage recess 10, while the other portion is a small-diameter portion having a sufficiently smaller diameter than the spring storage recess 10. By doing so, it is possible to prevent the spring 11 from accidentally falling off the retainer 2 when the punch 3 is replaced or the like. In FIG. 2, reference numeral 41 denotes a mounting hole for a positioning pin for positioning the retainer 2 (the retainer main body 4) with respect to the upper die 1, and reference numeral 42 fixes the retainer 2 (the retainer main body 4) to the upper die 1. Reference numeral 43 denotes a bolt hole for fixing the backing plate 5 to the retainer body 4.

Although the embodiment has been described above, the present invention is not limited to this, and includes, for example, the following case. The drive shaft 15a and the select bar 13 may be directly connected by the connection pins 24 or 34 without using the connection member 22 separately.

In the example shown in FIGS.
4 may be fixed to the select bar 13 side so that the connecting pin 24 is disengaged from the hole 23. in this case,
By forming the hole 23 to be elongated in the reciprocating direction of the select bar 13, it is possible to prevent the pressing force in the advance direction on the select bar 13 from acting on the connecting pin 24.

In the example shown in FIGS. 17 to 19, the connecting pin 34 is fixed to the connecting member 22 without rattling, and the connecting pin 34 is rotated with respect to the (select hole 13). Is also good. In this case, by forming the hole 39 elongated in the reciprocating direction of the select bar 13, it is possible to prevent the pressing force in the advance direction on the select bar 13 from acting on the connecting pin 34. It should be noted that the object of the present invention is not limited to what is explicitly specified, but also implicitly includes providing what is described as substantially preferred or advantageous.

[Brief description of the drawings]

FIG. 1 shows one embodiment of the present invention, and is a side sectional view when a punch is at a punchable position.

FIG. 2 is a top view when the backing plate is removed from the state of FIG.

FIG. 3 is a top view of an essential part when the select bar, the punch, and the spring seat member are removed from the state of FIG. 2;

FIG. 4 is a right side view of FIG. 5, showing an example of a punch in which a cross-sectional shape of a punched portion is an irregular shape.

FIG. 5 is a right side view of FIG. 4;

FIG. 6 is a top view of FIG. 4;

FIG. 7 is a plan view of a spring seat member.

FIG. 8 is a side view of a spring seat member.

FIG. 9 is an enlarged plan view showing a fitting state of a positioning pin and a positioning recess formed in a spring seat member.

FIG. 10 is a partial cross-sectional side view of a select bar.

FIG. 11 is a bottom view of FIG. 10;

FIG. 12 is a right side view of FIG. 10;

FIG. 13 is a plan view of a connecting member.

FIG. 14 is an exploded partial cross-sectional view showing a connection relationship between a connection member, a connection pin, and a select bar.

FIG. 15 is a partial cross-sectional side view showing a connection relationship between a connection member, a connection pin, and a select bar.

FIG. 16 is a side cross-sectional view showing a state when the select bar is at the retreat position and removing the select bar from the retainer.

FIG. 17 is a partial cross-sectional side view showing another connection relationship between the select bar and the cylinder device.

18 is a partial cross-sectional plan view of FIG.

FIG. 19 is an enlarged partial cross-sectional side view showing in detail a state where the select bar is pressed toward the advanced position by the connecting member in FIGS. 17 and 18.

[Description of sign]

 1: Upper die 2: Retainer 3: Punch 3a: Intermediate shaft portion 3c: Large diameter head 4: Retainer body 5: Backing plate 6: Side plate 7: Guide hole 8: Storage space 9: Spring seat member 11: Return spring 12: Guide groove 13: Select bar 13a: Projection 14: Connection mechanism 15: Actuator 15a: Drive shaft 22: Connection member 22a: Screw part 21: Connection hole 23: Mounting hole (Connection hole) 24: connecting pin (pin member) 32: connecting member 34: connecting pin (pin member) 38: connecting hole 39: mounting hole (connecting hole) L2: gap (play)

Claims (8)

[Claims] A punch is slidably held in an axial direction by a retainer mounted on a press die, and is directed toward a non-punchable position where a length of projection from the retainer is shortened by a spring. The punch is switched between a punchable position and a non-punchable position by changing the length of the punch protruding from the retainer in accordance with the reciprocating motion of the select bar disposed on the base end face side of the punch. In the punch holding device for a press die, the retainer has a retainer main body and a backing plate fixed to an upper surface of the retainer main body, wherein the backing plate is detached from the retainer main body. The punch and the spring spring seat member provided on the punch are detached from the upper surface side of the retainer main body, and are attached. A guide groove for slidingly guiding the torbar is formed in the retainer body so as to open on the upper surface of the retainer body; an actuator for reciprocatingly driving the select bar is fixed to the retainer body; A base end portion of the select bar is connected to the drive shaft of the actuator so as to be disengageable from an axial direction of the punch, and the actuator sets the select bar to a predetermined retreat position and the punch is Is set to be in the non-punchable position, the select bar is set so as to be located within the extension locus of the spring seat member in the punch axis direction, and the backing plate is removed from the retainer main body. By displacing the select bar upward as a whole, the select bar can be engaged and connected to the drive shaft of the actuator. A punch holding device for a press die, wherein the punch holding device is released and can be removed from the retainer main body. 2. The system according to claim 1, wherein the select bar and a drive shaft of the actuator are
Using a pin member extending in the axial direction of the punch, the actuator is connected so as to be disengageable in the axial direction of the punch, and is connected so as to have some play in the reciprocating direction of the select bar. The pressing force is not applied to the pin member when the select bar is pressed in the advance direction so as to be in a punchable position. . 3. The punch member according to claim 1, wherein a pin member extending in a punch axis direction is fixed to the drive shaft side, and the pin member is disengaged from a punch axis direction at a base end of the select bar. A punch holding device in a press die, wherein a connecting hole is provided. 4. A connecting member according to claim 1, wherein a connecting member extending shortly in a reciprocating direction of said select bar is fixed to a distal end face of said drive shaft, and above a base end portion of said select bar and above said connecting member. A projection is formed so as to be located, a connection hole extending in the punch axis direction is formed at each of the tip end of the connection member and the projection, and a pin extending in the punch axis direction is formed in one of the connection holes. While one end of the member is tightly fitted, the other end of the pin member is loosely fitted so that the other end can be disengaged.
A punch holding device for a press die. 5. The select bar according to claim 4, wherein the other connecting hole is formed to be slightly larger than the pin member in the longitudinal direction of the select bar, so that the actuator is at a position where the select bar can be punched. When the selector bar is pressed in the forward direction, the select bar receives the pressing force of the actuator directly from the distal end surface of the connecting member so that no pressing force acts on the pin member. Punch holding device in a press die. 6. A punch is slidably held in an axial direction by a retainer attached to a press die, and is directed toward a non-punchable position where the length of projection from the retainer is shortened by a spring. The punch is switched between a punchable position and a non-punchable position by changing the length of the punch protruding from the retainer in accordance with the reciprocating motion of the select bar disposed on the base end face side of the punch. In the punch holding device for a press die, the retainer has a retainer main body and a backing plate fixed to an upper surface of the retainer main body, wherein the backing plate is detached from the retainer main body. The punch and the spring spring seat member provided on the punch are detached from the upper surface side of the retainer main body, and are attached. A guide groove for slidingly guiding the torbar is formed in the retainer body so as to open on the upper surface of the retainer body; an actuator for reciprocatingly driving the select bar is fixed to the retainer body; A base end of the select bar is connected to a drive shaft of the actuator so that a tip of the select bar can swing upward, and the actuator allows the select bar to move to a predetermined retreat position. When the punch is in the non-punchable position, the select bar is set so as to be located within the extension trajectory of the spring seat member in the punch axis direction, and the backing plate is attached to the retainer body. By swinging the select bar so that its tip is directed upward in a state where the select bar is removed from the A punch holding device for a press die, wherein the punch holding device is deviated from an extension locus of the spring seat member. 7. The actuator according to claim 6, wherein the select bar and a drive shaft of the actuator are
Using a pin member, the tip of the select bar is connected so as to be swingable in the upward direction, and is connected so as to have some play in the reciprocating direction of the select bar. A punch holding device for a press die, wherein when the select bar is pressed in the advance direction so as to be at a punchable position, the pressing force does not act on the pin member. 8. A connecting member according to claim 6, wherein a connecting member extending shortly in a reciprocating direction of said select bar is fixed to a distal end surface of said drive shaft, and a base end of said select bar and a distal end of said connecting member are connected to each other. The tip of the select bar is pivotally connected in the upward direction by a pin member, and is connected so as to have some play in the reciprocating direction of the select bar. When the select bar is pressed in the advancing direction so as to be in a punchable position, the select bar is directly actuated from the distal end surface of the connecting member.
A punch holding device for a press die, wherein a pressing force is not applied to the pin member in response to a pressing force of the pressing member.