JP4659795B2 - Changing device for punching press unit - Google Patents

Description

  The present invention relates to a changing device for a punching press unit for punching parts constituting a frame of an automobile or the like, and more particularly to a step of a punching press unit corresponding to a pressed material having a different size or drilling position. The present invention relates to a replacement device.

  2. Description of the Related Art Conventionally, there is known a press working apparatus in which a press unit that presses a workpiece to be pressed is disposed on a bed. As shown in FIGS. 4A and 4B, this press working apparatus punches a hole in the work piece to be pressed together with a frame upper part 52a installed so that the punch 51 moves up and down, and the punch 51. A punching press unit 50 having a frame 52 in which a frame lower part 52b on which a die 53 is installed is arranged to face is used.

  A proximity dog 54 is fixed to the punch 51 of the punching press unit 50, and proximity switches 55 and 56 for confirming the rising end and the lowering end of the punch 51 using the proximity dog 54 are provided at predetermined positions on the frame 52. It is fixed to. A piston-type hydraulic cylinder 57 in which the punch 51 moves up and down is fixed to the frame upper portion 52a. The hydraulic cylinder 57 is connected to a control valve (not shown) through a pipe.

  Further, the press working apparatus includes a shift device 60 that moves the punching press unit 50 to the drilling position and the relief position in order to press the workpiece to be pressed set in the drilling position in advance. (For example, refer to Patent Document 1 and Patent Document 2). The shift device 60 includes a vertical movement mechanism 61 that moves in the vertical direction and a horizontal movement mechanism 62 that moves in the horizontal direction.

  As shown in FIG. 5A, the punching press unit 50 of the press working apparatus configured as described above is disposed at a predetermined position on the bed 70 for each vehicle type. For example, the press working material 80A of the vehicle type A In this case, the punching press unit 50A is used, and in the case of the press work material 80B of the vehicle type B, the punching press unit 50B is used. For example, the punching press unit 50A is moved from the escape position to the drilling position by the vertical movement mechanism 61 and the horizontal movement mechanism 62 of the shift device 60 with respect to the pressed workpiece 80A set at the drilling position. In addition, drilling can be performed on the pressed workpiece. At this time, the proximity dog 54 that has risen by the first proximity switch 55 for confirming the rising end is detected, the lift of the punch 51 by the hydraulic cylinder 57 is stopped, and the second proximity switch 56 for confirming the descending end is detected. By detecting the proximity dog 54 that has been lowered, the lowering of the punch 51 by the hydraulic cylinder 57 can be stopped.

JP-A-9-201628 Japanese Patent Laid-Open No. 2004-25195

  However, in the press working apparatus described in the background art, as shown in FIG. 5 (B), when adding a punching press unit 50C for not only the vehicle type A and the vehicle type B but also the vehicle type C, the installation space cannot be secured. There was a difficulty in having to design a new press working device. Even if the installation space can be secured, the hydraulic cylinders 57 are fixed to the punching press units 50A, 50B, and 50C. Therefore, the hydraulic cylinders 57, valves 59, and pipes 58 are required for the punching press units. In addition, a control circuit for controlling the valve 59 and wiring for connecting the control circuit to the valve 59 are also required for each punching press unit.

  The present invention has been made to solve such a conventional difficulty, and even if the size of the material to be pressed and the drilling position are changed, the positioning of the drilling process is easy, and the space is saved. It is an object of the present invention to provide a change-over device for a punching press unit that can be used in the manufacturing process.

  The punching press unit changing device that achieves the above-mentioned object includes an upper part of a frame installed so that the punch moves up and down, and a frame in which a die for punching a hole in a workpiece to be pressed together with the punch is installed. A punching press unit having a frame whose lower part is opposed to each other and a driving piston-type cylinder connected to the punch so as to reciprocate linearly in a vertical direction are fixed to the upper part of the frame of the punching press unit. The cylinder mounting bracket that is detachably fitted in the horizontal direction and the cylinder mounting bracket that fixes the drive piston cylinder are placed at the changeover position where the punching press unit is arranged for changeover. And a robot arm that can be moved to the processing position where the workpiece is punched. By fitting the robot arm mounting bracket connected to the robot arm and the support pin movably attached to the robot arm mounting bracket into the hole formed in the upper part of the frame of the drilling press unit, It comprises a support pin moving mechanism that connects the upper part of the frame and the bracket for mounting the robot arm.

  According to the change device of the drilling press unit which is the first aspect as described above, the cylinder mounting bracket to which one piston type cylinder is fixed is attached to the robot arm mounting bracket to be fixed to the robot arm. Since the robot arm mounting bracket and the punching press unit can be connected by the support pin moving mechanism, each piston press cylinder has a different punching press unit for each type of workpiece. Can be used for drilling.

  According to a second aspect of the present invention, in the change device for the punching press unit according to the first aspect, the cylinder mounting bracket and the robot arm mounting bracket are any of the cylinder mounting bracket and the robot arm mounting bracket. A slot that is formed on one side and the longitudinal direction is the vertical direction at the position where the reaction force generated on the punch works, and a size that fits into the slot and is movable in the vertical direction inside the slot. It is connected with the connection mechanism which consists of the convex part which consists of.

  According to the change device for the punching press unit according to the second aspect, the inside of the elongated hole formed in either the cylinder mounting bracket or the robot arm mounting bracket is inserted into the cylinder mounting bracket and Because it is a coupling mechanism that moves the convex part formed on the other of the robot arm mounting brackets in the vertical direction, it absorbs the reaction force generated in the punch when punching holes in the workpiece using the punch and die. Can absorb the load on the robot arm during drilling.

  According to a third aspect of the present invention, there is provided a change-over device for a punching press unit according to the second aspect, wherein the frame is formed in a substantially U-shaped side surface and is fitted to a portion to be an upper portion of the U-shaped frame. The bracket for use has a gap that absorbs a reaction force generated in the punch in the vertical direction with respect to a portion that is an upper portion of the frame.

  According to such a third aspect of the punching press unit changing device, the upper portion of the U-shaped frame is provided separately from the function of absorbing the load on the robot arm during the drilling of the coupling mechanism. The gap between the part and the cylinder mounting bracket can be provided with a function of absorbing the load on the robot arm during drilling.

  According to a fourth aspect of the present invention, in the change device for the punching press unit according to the first aspect, the support pin moving mechanism is fixed to the robot arm mounting bracket, and the support pin is attached to the hole formed in the upper part of the frame. And a connecting piston type cylinder that is detachably driven. In this specification, “insertion / removal” means insertion / removal.

  According to the change device for the punching press unit according to the fourth aspect as described above, the support pin can be inserted into and removed from the hole formed in the upper part of the frame by the connecting piston type cylinder. Becomes easier.

  According to a fifth aspect of the present invention, in the change device for the punching press unit according to the first aspect, one end is fixed to the punch and the other end is fixed to a predetermined position of the frame, and the tension spring always pulls the punch upward. It is equipped with.

  According to the change device for the punching press unit according to the fifth aspect as described above, the robot arm mounting bracket fitted with the cylinder mounting bracket to which one piston cylinder is fixed is fitted to the upper part of the frame. Since the punch of the punching unit that is not drilled can be always pulled upward by the tension spring, the cylinder and the punch can be easily connected with the piston rod of the piston-type cylinder retracted.

  According to a sixth aspect of the present invention, in the step change device for the punching press unit according to the first aspect, the robot arm mounting bracket detects the position of the proximity dog fixed to the punch and detects the rising end of the punch. And a second dog detection unit for detecting the descending end of the punch.

  According to the change device for the punching press unit according to the sixth aspect, the first dog detection unit for detecting the rising end of the punch and the second dog detection unit for detecting the falling end of the punch are provided. It is not necessary to provide each punching press unit, and wiring can be saved.

  According to the change device for the punching press unit of the present invention, the robot arm is provided with one piston-type cylinder, and the robot arm can be easily connected to the punching press unit which is different for each type of workpiece. Therefore, even if the type of workpieces to be pressed is added, there is no need for remodeling work. In addition, each piston press unit can be drilled with a single piston cylinder, and each punch press unit. Eliminates the need for piston-type cylinders, valves, piping, control circuits and wiring. Therefore, the equipment, space, etc. of the press working apparatus can be reduced.

  BEST MODE FOR CARRYING OUT THE INVENTION The best mode for carrying out the punching unit changing apparatus of the present invention will be described below with reference to the drawings.

  As shown in FIG. 2, the punching press unit changing device of the present invention has a tool table TR for changing the setting of a punching press unit 2 for punching a workpiece to be pressed such as an automobile roof assembly. Is applied to a plurality of press working devices 1, and a drive piston cylinder 4 is mounted on a robot arm 5a of a cylinder set-up robot 5 and moved to each punching press unit 2, 2, 2,. It is something that can be done.

  The tool table TR is arranged within the movable range of the robot arm 5. Therefore, the cylinder set-up robot 5 uses the robot arm 5a to change the piston-type cylinder 4 for driving to the tool base where the punching press units 2, 2, 2,. TR and the workpiece to be pressed can be moved to the respective processing positions arranged for punching.

  As shown in FIGS. 1 (A) and 1 (B), the punching press unit 2 punches a hole in a workpiece to be pressed together with a frame upper portion 22a installed so that the punch 21 moves up and down, and the punch 21. The frame 22 has a frame lower portion 22b disposed opposite to a frame lower portion 22b on which the die 23 is installed. The frame 22 has a frame footnote portion 22c that connects the frame upper portion 22a and the frame lower portion 22b so as to face each other while projecting in the horizontal direction, and is formed in a substantially U-shaped side surface. The guide foot 24 is installed in the frame footnote portion 22c so that the linear bearing 25 that moves linearly on the guide way 24 moves in the vertical direction. The punch body frame 26 in which the punch 21 is installed in the linear bearing 25. Is fixed. Therefore, the punch 21 can be moved up and down as the linear bearing 25 to which the punch body frame 26 is fixed moves linearly on the guide way 24.

  The frame upper part 22a of the frame 22 is a part that is detachably mounted by moving the driving piston cylinder 4 in the horizontal direction. The piston rod 41 of the driving piston cylinder 4 is placed below the frame upper part 22a. In order to be able to be connected to the punch body frame 26 to be arranged, the punch body frame 26 is composed of two arms 221 and 222 which are formed apart from each other in the horizontal direction. An operating rod 6 having an outward flange portion 6a formed at the distal end portion is fixed to the distal end portion of the piston rod 41, and is formed in an inverted T shape for hooking the outward flange portion 6a of the operating rod 6. A hooking groove 26 a is provided on the upper surface of the punch body frame 26.

  Therefore, in a state where the outward flange portion 6a of the operating rod 6 fixed to the tip end portion of the piston rod 41 of the drive piston cylinder 4 is inserted into the hook groove 26a of the punch body frame 26, the piston of the piston cylinder 4 When the rod 41 is lowered, the punch body frame 26 is lowered along the guide way 24 together with the linear bearing 25, so that the punch 21 can be fitted to the die 23 installed in the frame lower portion 22b.

  The driving piston type cylinder 4 for operating the punch main body frame 26 is formed in a shape that can be fitted to a frame upper part 22a composed of two arms 221 and 222 so as to be detachable in the horizontal direction. The cylinder mounting bracket 7 is fixed. As shown in FIGS. 3A and 3B, the cylinder mounting bracket 7 is formed in a quadrangular cylindrical shape so as to cover the two arms 221 and 222 as shown in FIGS. Holes 7a and 7b into which the operating rod 6 fixed to the tip end portion of the piston rod 41 can be inserted are provided in a portion of the cylinder mounting bracket 7 having such a shape where the driving piston cylinder 4 is fixed.

  Further, as shown in FIGS. 1A and 1B, the cylinder mounting bracket 7 is mounted on a robot arm mounting bracket 8 for fixing the robot arm 5a, and the cross sectional shape of the robot arm mounting bracket 8 is as follows. As shown in FIGS. 3A and 3B, it is formed in a U shape so as to cover the upper surface and both side surfaces of the cylinder mounting bracket 7. As shown in FIG. 1 (B), the side width of the cylinder mounting bracket 7 is formed such that the driving piston type cylinder 4 can be fixed, and the cylinder mounting of the robot arm mounting bracket 8 is performed. The upper surface portion to which the bracket 7 is attached is cut out so that the piston cylinder 4 can protrude. The cylinder mounting bracket 7 and the robot arm mounting bracket 8 are connected by a connecting mechanism 9 having a structure for absorbing a reaction force generated in the punch 21 when a punch 21 and a die 23 punch a hole in a pressed material. ing.

  The connection mechanism 9 is formed in the robot arm mounting bracket 8 and fitted in the slot 91 formed in the cylinder mounting bracket 7 and the slot 91 whose longitudinal direction is the vertical direction at the position where the reaction force generated in the punch 21 is applied. The projection 91 is formed of an ellipse having a size capable of moving in the vertical direction in the elongated hole 91. By configuring in this way, it is possible to absorb a reaction force generated in the punch 21 when a punch 21 and a die 23 punch a hole in a pressed material.

  Further, as shown in FIGS. 3A and 3B, the cylinder mounting bracket 7 has a gap for absorbing a reaction force generated in the punch 21 in the vertical direction with respect to the frame upper portion 22a. Specifically, a gap is provided between the upper and lower surfaces of the two arms 221 and 222 of the frame upper part 22 a and the inner wall 71 of the cylinder mounting bracket 7. Note that this gap is an elliptical portion of a two-dot chain line in FIG. By providing this gap, in addition to the function of absorbing the load on the robot arm 5 at the time of drilling by the connecting mechanism 9, the gap has a function of absorbing the load on the robot arm 5 at the time of drilling. Can be made.

  Further, as shown in FIGS. 1A, 1B, and 1C, this change-over device for the punching press unit supports the frame upper portion 22a of the punching press unit 2 and the robot arm mounting bracket 8. A pin moving mechanism 3 is provided. The support pin moving mechanism 3 is formed by fitting a support pin 31 movably mounted on the robot arm mounting bracket 8 into a hole 32 formed in the frame upper portion 22a of the drilling press unit 2. This is a mechanism configuration for connecting the frame upper portion 22a of the press unit 2 and the robot arm mounting bracket 8 together. Further, the support pin moving mechanism 3 includes a connecting piston type cylinder 33 that is fixed to the robot arm mounting bracket 8 and that drives the support pin 31 so as to be inserted into and removed from a hole 32 formed in the frame upper portion 22a. . Thus, by driving the support pin 31 with the connecting piston type cylinder 33, the support pin 31 can be drilled by the connecting piston type cylinder 33 and inserted into and removed from the hole 32 formed in the frame upper part 22 a of the press unit 2. Therefore, it is easy to change the drilling press unit.

  As described above, when the robot arm mounting bracket 8 is formed in a U-shape so as to cover the upper surface and both side surfaces of the cylinder mounting bracket 7 as described above, the robot arm mounting bracket 8 is supported on both side surfaces. An insertion hole 81 through which the pin 31 is movably inserted is provided. Further, the hole 32 is provided at a position corresponding to the insertion hole 81 in the frame upper portion 22a. Further, on both side surfaces of the robot arm mounting bracket 8, a connecting piston type cylinder 33 for driving the support pins 31 so as to be inserted into and removed from the holes 32 formed in the frame upper portion 22a of the press unit 2 is provided. Fix it. The support pin 31 can be driven by the connecting piston type cylinder 33 by fixing the support pin 31 to the tip of the piston rod 331 of the connecting piston type cylinder 33.

  Two support pin moving mechanisms 3 configured in this way are provided side by side on each side of the robot arm mounting bracket 8 to prevent the robot arm mounting bracket 8 from being displaced from the frame upper part 22a. it can. Further, the support pin 31 of the support pin moving mechanism 3 may be a hooked pin that prevents the support pin 31 from being inserted any more when it is inserted into the hole 32 formed in the frame upper portion 22a by a predetermined length. . By restricting the amount of insertion with the flange portion of the hooked pin in this way, it is possible to prevent the frame upper portion 22a from shifting in the width direction between the both side surfaces of the robot arm mounting bracket 8, and the robot arm mounting bracket 8 The gap between the both side surfaces and the frame upper part 22a can be provided with a margin in the step change.

  In addition, as shown in FIGS. 1A and 1B, the punching press unit changing device is provided with a tension spring 10 that always pulls the punch body frame 26 upward. The tension spring 10 has one hook 10a connected above the frame footnote 22c, and the other hook 10b always pulls the punch body frame 26 upward by the elastic force of the tension spring 10. 26 is connected. Thus, since the punch body frame 26 of the punching press unit 2 can be always pulled upward by the tension spring 10, the robot arm mounting bracket 8 to which the driving piston cylinder 4 is attached is attached to the frame upper portion 22a. Also in the punching press unit 2 that is not fitted in the punching body frame 26, the outward flange portion 6 a of the operating rod 6 fixed to the piston rod 41 with the piston rod 41 of the piston cylinder 4 retracted is used as the punch body frame 26. Can be hooked in the hooking groove 26a. Therefore, the driving piston cylinder 4 and the punch body frame 26 can be easily connected at the initial stop position where the piston rod 41 of the driving piston cylinder 4 is retracted.

  Further, in this change-over device for the punching press unit, the proximity dog 261 is fixed above the punch body frame 26, and the position of the proximity dog 261 is detected by the robot arm mounting bracket 8 to detect the rising end of the punch 21. The first dog detection unit 11 that detects the above and the second dog detection unit 12 that detects the descending end of the punch 21 are provided. The first dog detection unit 11 is fixed to the robot arm mounting bracket 8, and the second dog detection unit 12 is fixed to the lower end of the arm 13 fixed to the first dog detection unit 11 and extending downward. Has been. As described above, by providing the robot arm mounting bracket 8 with the dog detection units 11 and 12 that detect the rising end and the lowering end of the punch 21, the first dog detection unit 11 and the second dog detection unit 12 are respectively provided. It is not necessary to provide the punching press unit 2 and wiring can be saved.

  Note that as the detection medium of the first dog detection unit 11 and the second dog detection unit 12, an inductive proximity switch, a capacitive proximity switch, an ultrasonic proximity switch, and a photoelectric proximity switch may be used. Although it is possible, an inductive proximity switch is preferable from the viewpoint of detection distance.

  Further, as the driving piston type cylinder 4 and the connecting piston type cylinder 33 for drilling press working, a hydraulic cylinder is suitable, but not limited to this, a hydraulic cylinder driven by hydraulic pressure, air, water or the like is used. May be.

  1A, 1B, 1C, 2A, and 3A with respect to the operation of performing drilling on the material to be pressed by the changer of the punching press unit configured as described above. ) And (B).

  In the case where the punching press unit 2 corresponding to the vehicle type A is mounted on the robot arm 5a of the cylinder setup robot 5 (see FIG. 2), in order to switch to the punching press unit 2 corresponding to the vehicle type B, In order to move the robot arm 5a by the cylinder setup robot 5 and remove the punching press unit 2 corresponding to the vehicle type A, the connecting piston type cylinder 33 of the support pin moving mechanism 3 is driven to punch the support pin 31. 2 is pulled out from the hole 32 formed in the frame upper part 22a. Then, the cylinder mounting bracket 7 is removed from the two arms 221 and 222 of the frame upper portion 22a.

  At this time, since the punch body frame 26 is always pulled upward by the elastic force of the tension spring 10, the outward flange of the operating rod 6 fixed to the piston rod 41 at the initial stop position of the piston cylinder 4. The robot arm mounting bracket 8 can be horizontally moved by the robot arm 5a so that the portion 6a is caught in the hook groove 26a of the punch body frame 26.

  Next, the robot arm mounting bracket 8 is moved by the robot arm 5a to the setting position where the drilling press unit 2 corresponding to the vehicle type B of the tool table TR is arranged for setting, and the cylinder mounting bracket is moved. 7 is fitted to the two arms 221 and 222 of the frame upper part 22a.

  At this time, since the punch body frame 26 is always pulled upward by the elastic force of the tension spring 10, the outward flange of the operating rod 6 fixed to the piston rod 41 at the initial stop position of the piston cylinder 4. The robot arm mounting bracket 8 can be horizontally moved by the robot arm 5a so that the portion 6a is caught in the hook groove 26a of the punch body frame 26. In the cylinder set-up robot 5, the outward flange portion 6 a of the operating rod 6 is caught in the hook groove 26 a of the punch body frame 26, and the first dog detection unit 11 moves the proximity dog 261 of the punch body frame 26. The robot arm 5a is stopped when the robot arm mounting bracket 8 moves horizontally until it can be detected at a predetermined position.

  At this point, the support pin moving mechanism 3 can be engaged with the support pin 31 and the hole 32 formed in the frame upper portion 22a of the punching press unit 2. And the support pin 31 is inserted into the hole 32 formed in the frame upper part 22a of the press unit 2. Therefore, the cylinder mounting bracket 7 to which one driving piston cylinder 4 is fixed is connected to the punching press unit 2 corresponding to the vehicle type B via the robot arm mounting bracket 8 fixed to the robot arm 5a. Therefore, it is possible to perform drilling using a single drive piston-type cylinder for each drilling press unit that is different for each vehicle type.

  For punching the punching press unit 2 corresponding to the vehicle type B mounted on the robot arm 5a with a robot arm (not shown) of a workpiece moving set-up robot. Move to the processing position where it is placed. When the punching press unit 2 is set at the machining position, the driving piston cylinder 4 is controlled by a control circuit (not shown) to lower the piston rod 41. When the piston rod 41 is lowered, the operating rod 6 lowers the punch main body frame 26, so that the punch 21 and the die 23 can make a hole in the workpiece. At this time, the load on the robot arm 5 due to the reaction force generated in the punch 21 can be absorbed by the gap generated in the frame upper portion 22a and the cylinder mounting bracket 7 together with the coupling mechanism 9, so that the durability of the robot arm 5 is improved. Decline can be prevented.

  In this way, the cylinder mounting bracket 7 to which one driving piston cylinder 4 is fixed can be attached to the robot arm mounting bracket 8 fixed to the robot arm 5a. Since the robot arm mounting bracket 8 and the drilling press unit 2 can be connected, each drilling press unit 2 can be drilled by using one driving piston cylinder 4 for each vehicle type. become. In addition, since one driving piston cylinder 4 can deal with pressed workpieces having different sizes and drilling positions, each drilling press unit 2, 2, 2,. Eliminates the need for cylinders, valves, piping, control circuits and wiring.

  In the above-described embodiment, the coupling mechanism 9 has the long hole 91 formed in the robot arm mounting bracket 7 and the convex portion 92 formed in the cylinder mounting bracket 8. Even if a convex portion is formed in the mounting bracket 7 and a long hole is formed in the cylinder mounting bracket 8, the same operation and effect can be obtained.

  Although the present invention has been described with the specific embodiments shown in the drawings, the present invention is not limited to the embodiments shown in the drawings, and is known so far as long as the effects of the present invention are achieved. It goes without saying that any configuration can be adopted.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the preferable embodiment example by the change apparatus of the punching press unit of this invention, (A) is a front view, (B) is a side view, (C) is a fragmentary sectional view. It is explanatory drawing which shows the press work apparatus with which the change device of the punching press unit of this invention was applied. It is the elements on larger scale which show the component of the change apparatus of the punching press unit of this invention, (A) is the state figure before drilling, (B) is the state figure at the time of drilling. It is a figure which shows the conventional punching press unit, (A) is a front view, (B) is a side view. (A), (B) is explanatory drawing which shows the press work apparatus with which the conventional punching press unit was applied.

Explanation of symbols

2 …… Punch unit 21 …… Punch 22 …… Frame 22a …… Frame top 22b …… Frame bottom 3 …… Support pin moving mechanism 31 …… Support pin 32 …… Frame top hole 33 …… Connecting piston Cylinder 4 …… Piston cylinder for driving 5 …… Robot arm 7 …… Cylinder mounting bracket 8 …… Robot arm mounting bracket 9 …… Coupling mechanism 91 …… Long hole 92 …… Protrusion 10 …… Tension spring 11 …… First dog detector 12 …… Second dog detector 261 …… Proximity dog

Claims (6)

A punching press unit having a frame in which an upper part of a frame installed so that a punch moves up and down, and a lower part of a frame in which a die for punching a hole in a workpiece to be pressed together with the punch is disposed,
A driving piston-type cylinder connected to the punch is fixed so that the punch reciprocates linearly in the up-down direction, and is fitted so as to be detachable in the horizontal direction with respect to the upper part of the frame of the punching press unit. A cylinder mounting bracket,
The cylinder mounting bracket to which the driving piston-type cylinder is fixed is arranged for changing the position where the punching press unit is arranged for changing the position and for punching the pressed material. A robot arm mounting bracket coupled to a robot arm movable to each processing position;
By fitting a support pin movably mounted on the robot arm mounting bracket into a hole formed in the upper part of the frame of the punching press unit, the upper part of the frame of the punching press unit and the robot A change-over device for a punching press unit comprising a support pin moving mechanism for connecting an arm mounting bracket.   The cylinder mounting bracket and the robot arm mounting bracket are formed on any one of the cylinder mounting bracket and the robot arm mounting bracket, and the longitudinal direction is at a position where the reaction force generated in the punch acts. It is connected by a connecting mechanism consisting of a long hole that is in the vertical direction and a convex part that is formed in one of the other and is fitted in the long hole and is movable in the vertical direction in the long hole. 2. A changeover device for a punching press unit according to claim 1,   The frame is formed in a substantially U-shaped side surface, and the cylinder mounting bracket that fits into the upper part of the U-shaped frame is formed in the punch vertically with respect to the upper part of the frame. The change device for a punching press unit according to claim 2, further comprising a gap for absorbing a reaction force.   The support pin moving mechanism includes a connecting piston-type cylinder that is fixed to the robot arm mounting bracket and drives the support pin so as to be inserted into and removed from the hole formed in the upper portion of the frame. A change-over device for a punching press unit according to claim 1.   2. The punch press unit according to claim 1, further comprising a tension spring having one end fixed to the punch and the other end fixed at a predetermined position of the frame, and pulling the punch upward at all times. apparatus.   The robot arm mounting bracket detects a position of a proximity dog fixed to the punch and detects a rising end of the punch, and a second dog detecting unit detects a falling end of the punch. A change-over device for a punching press unit according to claim 1, further comprising a dog detection unit.

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