JP2011050995A - Method of changing tool in tandem press system and tandem press system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tandem press system by which tool changing is performable quickly and which has high productivity. <P>SOLUTION: A tool changing device is formed so that the tool changing device can be carried out and in from a space between a pre-press and a post-press to the outside of a machine in a tool changing direction and can be carried out and independently from the carrying-out and -in on the outside of the machine in the changing direction of a die of a bolster on which the die is set and also two loading/receiving parts which are arranged in parallel in the workpiece conveying direction in the cross bar loading part of the tool changing device and are formed so as to load two cross bars simultaneously and formed so that the present cross bar can be delivered from the workpiece conveying device to the loading/receiving part on one side between the presses during stopping pressing and the next cross bar can be delivered from the other loading/receiving part on the other side to the workpiece conveying device. The tool changing device can be carried out to the outside of the machine and so that, in the outside of the machine, the present cross bar can be demounted from the loading/receiving part on one side and the next cross bar can be loaded to the loading/receiving part on the other side. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  Tandem press formed so that the workpiece can be transferred from the front press arranged in the workpiece transfer direction using the workpiece transfer device to the post press and the tool mounted on the workpiece transfer device can be changed using the tool changer. The system and its tool exchange method.

  In the tandem press system in which a plurality of presses are arranged in the workpiece conveyance direction, the workpiece is molded by each press while the workpiece is conveyed from the front press to the rear press by the workpiece conveyance device. The workpiece transfer device holds a workpiece using a tool. This tool is often a unit type in which work holding means (for example, a plurality of vacuum suction cups) are arranged according to the work form and weight, and is detachably formed on the work transfer device via a cross bar. Yes. That is, the tool is attached to and detached from the work transfer device (connection holding portion) by attaching and detaching the cross bar to and from the connection holding portion of the work transfer device.

  When changing a press-processed product (product), it is necessary to replace the mold. The shape, size, and weight of the workpiece (material) often change. In such a case, a tool (hereinafter abbreviated as “current tool” in this specification) that has been used for the press processing up to the present time is used from the tool that has been used for the next press processing (hereinafter referred to as “current tool”). Abbreviated as “next tool”). The tool changer is an apparatus for exchanging a crossbar (hereinafter abbreviated as “current crossbar”) on which the current tool is mounted with a crossbar (hereinafter abbreviated as “next crossbar”) on which the next tool is mounted. It is. In the tool exchange operation, the next crossbar in which the next tool is mounted in advance is replaced in place of the current crossbar outside the machine after unloading. In some cases, the current tool is removed from the current crossbar after unloading, and then the next tool is attached to form the next crossbar.

  As a conventional tool changer, a conventional example 1 (for example, Patent Document 1) of a synchronous conveyance method synchronized with a mold conveyance and a conventional example 2 (for example, Patent Document 2) of an independent conveyance method are disclosed.

  Conventional Example 1 has a configuration in which a tool changer (12) composed of a rotating lever is pivotably attached to a slide table (bolster). The tool changer (12) is carried in and out of the machine along with the carrying in and out of the bolster for changing the mold. That is, the rotating lever is raised to accept the current crossbar and draw it toward the bolster, and then carry the bolster out of the machine. That is, the cash-type carry-out and the carry-out with the current crossbar are synchronized.

  A metal mold (hereinafter abbreviated as “cash mold”) that has been used for press work up to now outside the machine is abbreviated as a “next mold” used in the next press work. )), The current cross bar is replaced with the next cross bar, and then the bolster (die) is carried into the press and conveyed synchronously. After the replacement to the next mold, the rotating lever is pulled away from the bolster side, and the next crossbar is delivered to the work transfer device (connection holding unit). After that, the turning lever is turned to the horizontal state.

  Thus, since it is a bolster side turning type tool changer, it is described that it is possible to achieve an effect that does not impede access to the press. However, since it is necessary to always support the tool changer (rotating lever or the like) 12 in a horizontal state, it is difficult to adopt it in a tandem press system in which the pitch between the front press and the rear press is narrow. .

  In this regard, Conventional Example 2 is provided with a dolly that can run on rails (r1, r2) that extend from the press to the outside of the machine, and a dolly (3) for receiving a crossbar (cb) on this dolly (1). Install. Then, in order to prevent wobbling and tilting in the case of narrow and tall, a large number of rollers (r01, r02, r03) are used to stabilize the position of the carriage (base) with respect to the rail. Thus, it is said that it is possible to provide an inter-press conveyance device that can smoothly carry the cross bar (cb) out and out of the machine even when the inter-press pitch is narrow.

  In this conventional example 2, there is no description regarding the relationship with the work transfer device, the crossbar replacement work and the die replacement work. However, the toolbar replacement work that can be performed using this inter-press transfer device is as follows. It is guessed that it will be executed in That is, an empty inter-press transfer device [a cradle (cart)] is carried between presses from the outside of the machine, the current crossbar is received from the work transfer device to the cradle, and the inter-press transfer device is carried out of the machine. Outside the machine, remove the current crossbar from the cradle and then attach the next crossbar to the cradle. Next, the inter-press conveying device is re-introduced from the outside of the machine between the presses, and the next crossbar is delivered to the empty work conveying device that has been waiting. Thereafter, the inter-press conveying device is re-loaded out of the apparatus.

JP 2004-50290 A JP 2005-161379 A

  By the way, the conventional example 1 is intended only for ease of access within the press, and the conventional example 2 is only for the purpose of devising the narrowing of the pitch between the presses, improving the productivity of the entire tandem press system and speeding up the tool replacement work. I have to say that I am completely indifferent. In other words, there is no recognition or suggestion of the following issues.

  In other words, speeding up of tool change work directly leads to productivity improvement. In the first conventional example, as described above, the mold changing work and the tool changing work are performed in time series in order, and it is difficult to promote the speed of the tool changing work in relation to the mold changing work. Since the pulling / separating time for the rotating lever (exchanger 12) with respect to the bolster (table) is also added, the speed is further reduced. The turning motion is also a factor of slowing down. In addition, even if the access within the press is facilitated, the space on the press side (side opening) is narrowed, so that it does not contribute to the improvement of productivity by facilitating work. In addition, since the rotating lever (exchanger 12) is carried out of the machine as a unit with the bolster, the mechanical configuration becomes an obstacle, and it is very troublesome for the mold exchange work and the subsequent tool exchange work in the outside work place. It is pointed out in actual operation that it takes time (difficult to work). Also, the tool cannot be changed without changing the mold.

  In the case of the conventional example 2, since the vehicle travels in a straight line, the carry-in / out speed can be relatively increased as compared with the turning of the conventional example 1 (and the linear movement of the heavy bolster). However, it is necessary to reciprocate the carriage (base) between the outside of the machine and the inside of the press for tool exchange. In addition, the current crossbar can be removed from the inter-press transfer device (the cradle) that has been unloaded, and the next crossbar can be attached only after that. Work is cumbersome and busy, and work mistakes are likely to occur. Both extend the tool change time.

  An object of the present invention is to provide a tandem press system capable of quickly changing tools and having high productivity.

  Tool change work is performed during the press stop period. In addition, the tool replacement work performed outside the machine can be performed more accurately and safely as the time margin increases, and the mental and physical burden on the operator can be reduced. On the other hand, productivity can be improved because resumption of the press operation can be accelerated as the exchange time of the old and new crossbars to the work transfer device is shorter.

  The present invention, based on the reconfirmation of the technical matters inherent in this tandem press system, extends the tool change time outside the machine (extension) and shortens the tool change time between presses ( It is constructed so that it can satisfy both requests.

  In other words, the next crossbar (next tool) can be prepared outside the machine with sufficient margin during the press operation (machining) period, and the current crossbar can be accepted and the next crossbar delivered between the presses. It can be executed continuously, and it is formed so that the necessary crossbar can be carried in between the outside of the machine and between the presses until the current crossbar is carried out by one reciprocation of the tool changer. Productivity can be maximized by speeding up the entire tool change operation.

  Specifically, the tool changing method of the tandem press system according to the first aspect of the present invention is a tool changer capable of transferring a workpiece using a workpiece transfer device from a front press arranged in the workpiece transfer direction to a post press. A tool change method of a tandem press system formed so that a tool mounted on a work transfer device can be changed, wherein A: one of the tool change devices outside the machine in a tool change direction perpendicular to the work transfer direction Alternatively, the next crossbar on which the next tool is mounted is loaded on the other stacking receiving portion, and B: the tool changer loaded with the next crossbar while the press is stopped is moved from the outside of the machine to the front press and the rear. C: The current tool is transferred from the work transfer device to any empty stack receiving portion of the tool changer between the presses. Delivered the current crossbar mounted, D: Then handed over the next crossbar loaded in the one or the other stacking receiving portion to the work transfer device, E: Subsequently received from the work transfer device Unloading the tool changer loaded with the current crossbar on the other or one load receiving portion to the outside of the machine, and ending the replacement work of the tool mounted on the work transfer device. To do.

A tandem press system according to a second aspect of the present invention is a work transport for transporting a work from a front press to a rear press using a plurality of presses arranged in the work transport direction and a tool mounted via a crossbar. In a tandem press system comprising an apparatus and a tool changer for exchanging a tool mounted on a work transfer device, the tool changer is connected between the front press and the post press between the work transfer direction and the work change direction. It is designed to be able to carry in / out outside the machine in the tool exchange direction orthogonal to the machine and to be able to carry in / out independently of the bolster in which the mold is set to the outside in the mold exchange direction perpendicular to the workpiece conveyance direction. The crossbar stacking section of the tool changer is provided with two stacking receiving sections arranged in parallel in the workpiece transfer direction, and two crossbars can be stacked at the same time. And,
Between the presses during which the press is stopped, the current crossbar in which the current tool is mounted can be delivered from the work transfer device to any empty stack receiving portion of the tool changer, and one or the other of the tool changers can be delivered. The next crossbar in which the next tool is mounted on the work transfer device can be transferred from the load receiving unit, and the tool changer that has received the current crossbar can be carried out of the machine in the tool change direction. The present crossbar can be removed from the other or one of the load receiving portions outside the machine, and the next crossbar can be stacked on one or the other load receiving portion thereafter.

  According to a third aspect of the present invention, there is provided a stacking position automatic switching control means, and when the current holding crossbar is handed over to the connection holding portion of the work transfer device, when the next crossbar is received by any of the empty stacking receiving portions. It is formed to be switchable and positionable to the one or the other loading receiving portion on which the next crossbar is loaded.

  According to a fourth aspect of the present invention, the crossbar stacking portion of the tool changer is formed so as to be able to move up and down following the change in the vertical position on the workpiece transfer device side when the crossbar is stacked. In the invention according to claim 5, the workpiece transfer device is supported on the foundation directly or indirectly via the vibration isolator.

  The invention according to claim 6 is a tool changer comprising: a crossbar loading portion; a carriage capable of traveling along a traveling rail extending in the tool changing direction; and a connecting member for connecting the crossbar loading portion to the carriage. The crossbar loading portion is formed so as to be movable up and down with respect to the carriage. According to the seventh aspect of the present invention, the crossbar loading portion can be moved up and down in three stages: a low position when the carriage is running, an intermediate position when the tool is changed, and a high position when the crossbar is delivered. According to the invention of claim 8, the carriage and the traveling drive unit are disposed below the floor plate member, and the two notch portions having a narrow dimension in the workpiece transfer direction and extending in the tool replacement direction are provided on the floor plate member. It is formed from two or more plate-like members that are formed and movable in the tool changing direction with the connecting member penetrating the notch.

  According to the first aspect of the present invention, tool replacement can be performed quickly and productivity can be greatly improved.

  According to the invention of claim 2, it is a suitable apparatus that can smoothly implement the invention of claim 1, and it is easy to implement and easy to handle.

  According to the invention of claim 3, compared with the invention of claim 2, more accurate delivery / acquisition can be performed more quickly.

  According to the invention of claim 4, compared to the cases of the inventions of claims 2 and 3, the crossbar can be loaded on the crossbar loading section without shock. According to the invention of claim 5, as compared with the case of the invention of claim 4, it is possible to follow a change in the vertical direction position on the workpiece transfer device side by the vibration isolator.

  According to the invention of claim 6, compared to the inventions of claims 2 to 5, the tool exchange work outside the machine can be performed in a natural and easy posture. According to the seventh aspect of the invention, compared to the case of the sixth aspect of the invention, it is possible to further promote the traveling stability of the carriage and the crossbar delivery stabilization.

  According to the invention of claim 8, compared with the inventions of claims 6 and 7, it can be applied even when the distance between presses is smaller, and scrap processing is easy.

It is a top view for demonstrating the tandem press system which concerns on this invention. FIG. 4 is a side view for explaining the relationship between the post press, the work transfer device, and the tool changer as viewed from the upstream side in the Y direction in FIG. 1, (A) is a tool change operation outside the machine, (B ) Shows the next crossbar delivery work between presses. It is a figure for demonstrating the raising / lowering means which raises / lowers a crossbar loading part mainly, (A) is a top view, (B) is the side view which partially cut. It is the front view which carried out the section for explaining the up-and-down direction position of the crossbar loading part on the basis of a trolley, (A) is an intermediate position, (B) is a low position, (C) is a high position Indicates. It is a top view for demonstrating a load receiving part and a floating means. Similarly, it is a front view.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.

  1 to 6, the tandem press system 1 can carry the tool changer 30 into and out of the machine 105 in the tool change direction (Yt direction) perpendicular to the workpiece transfer direction (X direction) from between the presses 11. The tool changer 30 can be loaded and unloaded in and out of the machine 104 in the mold exchange direction (Yd direction) perpendicular to the X direction of the bolster 14 on which the mold is set. The unit 31 is provided with two stacking receiving portions 33D and 33U arranged in parallel in the X direction, and can simultaneously stack two crossbars 61 (61D and 61U), and a work conveying device between the presses 11 when the press is stopped 20 passes the current cross bar 61B to one (or the other) stack receiving portion 33D (33U) that is empty of the tool changer 30, and the other (or one) stack receiving portion 33U ( 3D) is formed so that the next crossbar 61A loaded on the work transfer device 20 can be delivered to the work transfer device 20, and the tool changer 30 that has received the current crossbar 61B is unloaded to the outside 105 to receive one (or the other) load receiving device. The current crossbar 61B is removed from the portion 33D (33U), and the next crossbar 61A can be stacked on the other (or one) stack receiving portion 33U (33D).

  That is, the tandem press system 1 is basically a tandem press system corresponding to the invention of claim 2, and is a system suitable for carrying out the tool changing method according to claim 1. The destination of the current crossbar 61B between the presses 11 is the empty one of the two stacking receiving portions 33D and 33U [that is, one of the two stacking receiving portions 33D and 33U]. As long as the cross bar 61 is loaded after the current cross bar 61B is removed, either of the two stack receiving parts (33D, 33U) may be used. What is necessary is just to select from the point of the layout and workability | operativity of the tool exchange work apparatus in the apparatus 105 outside. In the following of this embodiment, for simplification of explanation, the delivery destination of the current crossbar 61B is basically set as one stacking receiving portion 33D, and the loading destination of the next crossbar 61A is set as the other stacking receiving portion 33U. Describe.

  In FIG. 1 (plan view) and FIG. 2 (side view), the tandem press system 1 uses a plurality of presses 10 arranged in the X direction and a pre-press using a tool 65 mounted via a cross bar 61. The workpiece conveyance device 20 that conveys a workpiece (not shown) from 10U to the post-press 10D, and the tool exchange device 30 for exchanging the tool 65 (crossbar 61) attached to the workpiece conveyance device 20 are provided. The front press 10U is an upstream side in the X direction, and the rear press 10D is an adjacent downstream press. The space between both 10U and 10D is referred to as a press space 11.

  Note that the tool changer 30 in FIG. 1 corresponds to the post-press 10D (30D). Further, in FIG. 1, a tool changer 30 (30U) corresponding to the front press 10U, each press 10 on the upstream side, each tool changer 30, and each press 10 on the downstream side of the post press 10D. The respective tool changers 30 are not shown.

  The bolster 14 of each press 10 is carried in and out in the Yd direction by a mold exchanging device 15 including a rail 16 and a carriage (not shown) shown in FIG. It is possible to exchange the cash mold carried out of the machine 104 with a new next mold. This mold change operation must be careful and requires a considerable amount of time. 1 is a scrap shooter, which is disposed on both sides of the bolster 14 in the X direction.

  The tool changer 30 (30D) shown in FIG. 1 loads the current crossbar 61B delivered from the workpiece transfer device 20 between the presses 11 during the press stop period on one of the stack receiving portions 33D and 33D, and then the machine. The state carried out to the outside 105 is shown. The current tool 65B attached to the current crossbar 61B is a unit type including a plurality of vacuum suction cups, attachments, attachment / detachment operation handles, and the like, and is displayed as a space occupied by the tool (unit) 65B. On the outside 105, the next cross bar 61A (next tool 65A) indicated by a broken line is loaded on the other stack receiving portions 33U and 33U.

  That is, the tool change work for removing the current crossbar 61B from the tool changer 30 and attaching the next crossbar 61A can be executed at any time with sufficient time in the outside of the machine 105 and during the press operation.

  1 is a side view as viewed from the upstream side in the X direction [FIG. 2 (A)], and a tool change operation in which the next crossbar 61A is loaded on the pair of left and right crossbar loading portions 31 (33U) and 31 (33U). Shown later. The press operation is performed in the post press 10D. 2B shows a state in which the tool changer 30 loaded with the next cross bar 61A travels and is carried into the space 11 between the presses in the Yt direction. The right half shows the state where the next crossbar 61A is delivered from the tool changer 30 after loading to the work transfer unit 20.

  In FIG. 2, the work transfer device 20 is means for transferring a work (not shown) from the pre-press 10U to the post-press 10D, and the transfer method and structure are not limited. The workpiece transfer device 20 according to this embodiment includes a transfer member (not shown) that can reciprocally swing around a support shaft provided at the center of a press (10D, 10U) 11, and a vertical direction with respect to the transfer member. It includes a feeder arm 21 that is mounted so as to be reciprocally movable, and a connection holding portion 25 that is attached to the lower end of the feeder arm 21, and a front press 10U (bolster 14... Cash through a cross bar 61 (tool 65). It is formed so that the workpiece accepted from the mold) can be transported and set in the post-press 10D (bolster 14 ... cash mold).

  Further, the workpiece transfer device 20 can deliver the current crossbar 61B (current tool 65B) to the tool changer 30 via the connection holding unit 25, and then transfer the next crossbar 61A (next tool 65A) from the tool changer 30. It is configured to be accepted. The connection holding part 25 having an auto tool changer function can be connected to the connection part 62 on the crossbar (61) side and can completely hold the crossbar 61 in a connected state. Further, in the connected state, the air piping system and the electrical system on the workpiece transfer device 20 side can be automatically connected to the tool 65 mounted on the cross bar 61.

  The workpiece conveyance control means is formed of a servo motor control device (not shown), and can convey the workpiece held by the tool 65 from the pre-press 10U to the post-press 10D while swinging the conveying member. The feeder arm 21 is driven to move up and down by a feeder driving device 22. The feeder arm 21 and the connection holding part 25 have a structure capable of maintaining the cross bar 61 in a horizontal state both when the workpiece is taken from the front press 10U and when the workpiece is delivered to the rear press 10D. That is, the workpiece can be conveyed with a constant posture.

  Specifically, as shown in FIGS. 2 and 4, the tool changer 30 (30U) includes a pair of left and right crossbar loading portions 31 attached to each device main body 41, a carriage 51, and the carriage 51. The crossbar stacking portion 31 (device main body 41) is connected to the crossbar loading portion 31 and the travel drive portion 58, and the current crossbar 61B (current tool 65B) mounted on the work transfer device 20 is formed to be replaceable. ing.

  The apparatus main body 41 has a structure in which a cylindrical stationary portion 43 is erected on a base 42 shown in FIG. 4C, and a movable portion 44 is fitted in the stationary portion 43 so as to be movable up and down. The structure is convenient for introducing the lifting means 70 described in detail later.

  The cart 51 has a structure in which an upper roller 52, a lower roller 53, and a side roller 54 shown in FIG. 4B are rotationally engaged with a traveling rail 55 in a cart body 51B shown in FIG. The device main body 41 is integrally connected and fixed via a pair of front and rear connecting members 47 and 47.

  The carriage 51 can travel along the traveling rail 55 that extends in the Yt direction shown in FIG. 1. The traveling rail 55 is supported by the foundation 200 via a rail mount 56 shown in FIG. The traveling drive unit 58 includes a motor, a sprocket, a chain 59, and the like. The traveling drive unit 58 can drive the carriage 51 (load receiving unit 33) in the Yt direction and can hold and stop at a predetermined position between the outside 105 and between the presses 11. it can.

  As shown in FIGS. 2 and 4, the carriage 51 and the travel drive unit 58 are disposed below the floor board member 100 (basement 102). The floor plate member 100 is provided with a pair of cut portions 101 (see FIG. 1) having a narrow dimension in the X direction (for example, 30 mm) and extending in the Yt direction. In order to enable the pair of left and right connecting members 47 to move smoothly and in a sealed state in the Yt direction while passing through the respective cut portions 101, the connection members 47 are slightly smaller than the width of the cut portions 101. It has a small size (thickness) and is formed from two or more plate-like members. That is, there are two plate-like members (47) in the X direction, but one or more in the Yt direction.

  With such a configuration, even if some components (travel rail 55, carriage 51, etc.) constituting the tool changer 30 are provided below the floor (basement 102) as shown in FIG. There is no need to attach an opening / closing cover (for example, the trench cover of the conventional example 2) as a measure for preventing dust / scrap scattering or for personal safety at the ceiling opening. Therefore, it is possible to eliminate the work of opening and closing the heavy opening / closing cover prior to the tool replacement work, and thus it is possible to promote time reduction and productivity improvement. In addition, it is possible to prevent the generation of loud noises and the fatigue of workers when the cover is opened and closed.

  The tool changer 30 can carry in and out of the machine 105 in the Yt direction from the space 11 between the presses shown in FIG. 1 and carries in and out independently of the carry in and out of the bolster 14 of the press 10 in the Yd direction (external machine 104). It is understood that it is possible. That is, tool change and mold change can be performed independently. The time delay and work complexity due to the work over time according to Conventional Example 1 can be eliminated.

  1, 3, and 5, a pair of (two) stacking receiving portions 33 (upstream in the X direction) arranged in parallel in the X direction on each crossbar stacking portion 31 of the tool changer 30. The other side is 33U and the downstream side is 33D), and at the same time, two cross bars 61B and 61A can be stacked.

  Further, the workpiece transfer device 20 and the tool changer 30 can receive (stack) the current crossbar 61B separated (delivered) from the workpiece transfer device 20 between the presses 11 by one of the load receiving portions 33D and 33D. Thereafter, the next crossbar 61A loaded on the other stacking receiving portions 33U and 33U is formed so as to be delivered to the work transfer device 20. The next cross bar 61A is preloaded on the other stacking receiving portion 33U outside the machine 105.

  The load position automatic switching control means is provided so that the old and new (current) crossbars can be exchanged accurately and quickly. This automatic loading position switching control means 23 is a program control system as in the case of the above-described work transfer control means, and when the connection holding portion 25 of the work transfer device 20 is delivered to the current crossbar 61B, When positioning to the portion 33D and taking on the next cross bar 61A, control is performed so that positioning can be performed on the other stack receiving portion 33U. In addition, as described above, the next crossbar load receiving portion designation switch is provided and loaded in preparation for the case where the load destination of the next crossbar 61 is selected and switched to either of the load receiving portions (33D, 33U). The position automatic switching control means 23 is formed so as to be able to perform automatic switching control based on information designated by this switch.

  Thus, the work for exchanging the crossbar 61 can be performed only by making the tool changer 30 reciprocate between the press 11 and the outside 105. Further, before the current crossbar 61B (current tool 65B) is carried out to the outside 105, that is, during the press operation, the crossbar stacking portion 31 (the other loading receiving portion 33U) is moved to the next crossbar 61A in the outside 105. (Next tool 65A) can be loaded in advance. The problems of Conventional Example 2 (longer tool replacement work including two reciprocating loading / unloading times and work difficulty) can be eliminated.

  The elevating means 70 is a means for elevating and lowering the crossbar stacking unit 31 with respect to the carriage 51, and allows a worker to perform tool replacement work on the outside 105 in a comfortable and comfortable posture. The lifting and lowering means 70 of this embodiment is configured so that the crossbar stacking unit 31 is placed in the lower position (LL) when the carriage is moved in parentheses in FIGS. 2 and 4, the intermediate position (LM) when the tool is changed, and when the crossbar is delivered. It is formed so that it can be moved up and down in three stages of the high position (LH).

  In FIG. 4, the lifting / lowering means 70 is formed of a lift cylinder device (lift cylinder 71, piston 72) and intermediate positioning means 81. That is, the lift cylinder device itself employs a simple two-stage switching positioning raising / lowering system, and is formed so that three-stage switching positioning can be accurately performed by combining the intermediate positioning means 81 with this. However, for example, it may be formed so that it can be switched in multiple steps or each position can be changed by a servo motor control system.

  Each lift cylinder 71 is disposed in the apparatus main body 41 (stationary portion 43), and the tip of the piston 72 is connected to the crossbar stacking portion 31. The pinions 74 and 74 that mesh with the racks 75 and 75 attached to the left and right (Yt direction) movable parts 44 and 44 shown in FIG. 3 are connected by a tuning shaft 73 that extends in the Yt direction. Accordingly, the left and right crossbar stacking portions 31 can be moved up and down synchronously while maintaining the same height. The free rotation of the tuning shaft 73 can be stopped by the brake 77, and the position after the elevation adjustment can be stably held.

  4B, the crossbar stacking portion 31 is lowered to the low position (LL), and the engagement piece 76 attached to the lower end portion of the rack 73 comes into contact with the low position stopper 88 in the stationary portion (43). It is in a state. This low position (LL) is a position where the center of gravity of the tool changer 30 can be lowered to increase the speed and smoothness of travel. Further, it is selected as a position where interference with other devices / equipment disposed between the presses 11 and the outside 105 can be avoided. As the lower position (LL) is lower, simplification of the entire structure of the carriage including the engagement mechanism between the running rail 55 and the carriage 51 can be promoted, and the center of gravity can be lowered.

  FIG. 4C shows a state in which the crossbar stacking portion 31 is raised to the high position (LH) and the engagement piece 76 is in contact with the high position stopper 86 in the stationary portion (43). By the way, since the workpiece transfer device 20 has a dependency selected (constructed) in relation to the configuration and operation of the press 10 (including the die on the bolster 14), It is difficult to change the structure or function without permission.

  Here, the high position (LH) does not force structural or functional alteration of the work transfer device 20, and between the press changer (11), between the tool changer 30 (31) and the work transfer device 20. Is selected as a position where the crossbar 61 can be quickly and smoothly received and delivered. By selecting this high position position (LH) within a permissible range, the lift stroke of the feeder arm 21 (connection holding part 25) can be reduced, thereby reducing the cost of the workpiece transfer device 20 and the lift time. It is also effective for improving productivity.

  When the tool changer 30 (31) is carried out to the outside of the machine 105 at the high position (LH), the tool changer 30 (particularly, the carriage 51) is more robustly structured as in the case of the conventional example 2. In order to avoid interference, peripheral devices and equipment are forced to be structurally and functionally sacrificed. However, it is inconvenient to accept (take-off) the crossbar 61 from the work transfer device 20 side with the low position (LL) shown in FIG. 4B from the above-mentioned situation on the work transfer device (20) side. And disadvantageous.

  Incidentally, since the conventional tool changer has a fixed structure in which one position that can be allowed in accordance with the situation of each press system is selected even in the case of the conventional example 2, for example, it is related to acceptance / delivery with the workpiece transfer device 20. It has not been possible to optimize both the characteristics and the characteristics relating to the loading / unloading (running) of the tool changer 30 at the same time. In many cases, a position as low as possible has been selected as much as possible in view of avoiding interference with peripheral devices and simplifying the structure of the carriage.

  However, this way of thinking (selection criteria) mainly has strong affairs and position on the maker side, and there is a possibility that it lacks the position on the user side who actually uses it. According to the observation of many conventional actual machines, there are cases where the burden on the worker who performs the tool change work outside the machine 105 is heavy (large). That is, when the work position is too low, the work is performed with a bent and unreasonable posture. The same applies when the work position is extremely high. In particular, when the current tool 65B is removed from the current crossbar 61B loaded on the crossbar loading section 31, and then the next tool 65A is attached to form the next crossbar 61A, the current crossbar 61B (current tool 65B) is removed. And the burden is very large compared with the case where it replaces | exchanges for the prepared next cross bar 61A (next tool 65A).

  Here, it is very large that the position of the external replacement work position where the worker can perform the tool replacement work quickly and in the most comfortable posture without any difficulty will contribute to the improvement of production efficiency and cost reduction. Understood. In view of this, the tool is exchanged at the intermediate position (LM) shown in FIG. By introducing the intermediate positioning means 81, the intermediate position (LM) can be accurately positioned while simplifying the structure and function of the elevating means 70 as described above.

  The intermediate positioning means 81 is formed of an L-shaped intermediate position stopper 83 and a link cylinder 84 that can rotate around a fulcrum shaft 82 that is implanted in the bracket 89. The intermediate position stopper 83 is switched to the horizontal state shown in FIG. 4A before and after the raising / lowering operation of the raising / lowering means 70 is started, and the engaging piece 76 integral with the movable portion 44 (rack 75) is placed in the middle in the ascending process of the piston 72. The position is restrained by being engaged (locked) with the position stopper 83, and is positioned at the intermediate position (LM). This intermediate position (LM) can be easily changed to the ideal position by changing the vertical fixing position of the bracket 89 with respect to the stationary part 43.

  By the way, even when the current crossbar 61B is handed over from the workpiece transfer device 20 to the tool changer 30, even when the next crossbar 61A is received (taken away) from the tool changer 30, the feeder arm 21 (connection holding part 25). Must be accurately moved up and down by a predetermined amount. Therefore, the workpiece transfer control of the workpiece transfer device 20 (for example, the vertical movement control of the feeder arm 21) is compared with the post-detection positioning control method in which the motor is stopped and positioned on condition that the limit switch detects the target position. The quantitative positioning control method in which the position control is performed using a pulse signal corresponding to the movement distance as an input is preferable. Moreover, the latter has higher positioning accuracy and a simple configuration.

  However, the vertical relative position between the tool changer 30 and the work transfer device 20 may change. Due to mechanical structure, load change, thermal deformation, etc. Even when the work transfer device 20 is directly installed on the foundation 200 via a dedicated vibration isolator, the relative position change in the vertical direction will occur.

  In particular, as shown in FIG. 2, each press 10 (base 205) is installed on a foundation 200 via a vibration isolating device (for example, a vibration isolating rubber) 201 that can be displaced in the vertical direction. When it is incidentally installed on the 10 frames or the base 205 (that is, when it is indirectly installed on the foundation 200 via the vibration isolator 201), it greatly changes. That is, even if the structure and weight of the press 10 and the workpiece transfer device 20 are the same, the vertical relative position of the workpiece transfer device 20 (25) with respect to the tool changer 30 changes depending on the type of the mold and the tool. Then, when the current crossbar 61B is handed over from the workpiece transfer device 20 to the tool changer 30, there is a possibility that impact and noise are generated, and that the device is further deformed or damaged.

  This problem should be solved by all means for a press system that is used for various kinds of small-volume production with a high mold exchange frequency. Therefore, floating means 90 is provided as means for absorbing the vertical position change between the tool changer 30 (crossbar stacking unit 31) side and the workpiece transfer unit 20 (connection holding unit 25) side, The crossbar stacking portion 31 (33) is formed so as to automatically move up and down following the change in the vertical position on the workpiece transfer device 20 (feeder arm 21) side.

  5 and 6, the floating means 90 is formed by a spring 91, a bracket 92, and linear guides (stationary side linear guide 35, movable side linear guide 95). The L-shaped bracket 92 is attached to the stacking body 32 so as to be movable in the vertical direction of FIG. 6 via a linear guide. When the stacking receiving portions 33 </ b> D and 33 </ b> U are attached to the bracket 92, the bracket 92 is biased upward by the spring 91. That is, the stack receiving portions 33D and 33U can be held in a floating state.

  The strength of the spring 91 is selected to a value that allows the current crossbar 61B to be delivered to the tool changer 30 (load receiving portion 33D) without shock in any of the following cases. For example, when the mold weight is the maximum and the vertical position change amount is maximum (for example, 2 to 5 mm), the maximum vertical position change amount (2 to 2 on the work transfer device 20 (connection holding unit 25) side). 5 mm) is a value that can be absorbed by the floating means 90. Even at the lowest position after absorption, the tool stacking portion 31 (load receiving portion 33D) is held in a floating state with respect to the upper end surface of the stacking portion main body 32 as shown in FIG. When the mold weight is the lightest and the vertical position change amount is minimum (or zero), the current crossbar 61B held by the work transfer device 20 (connection holding unit 25) is loaded on the stack receiving unit 33D ( It is a value that can be contacted. However, even when the amount of change in the vertical position is minimum (or zero), the spring 91 may be displaced (flexed) downward by the minimum amount.

  5 and 6 is inserted into the position restriction hole (not shown) on the side of the descending crossbar 61 so that the tool position changer 30 (the stacking body 32) is planar. Ensure positioning.

  In the tandem press system 1 according to the embodiment, the tool changing method is performed as follows.

(During press operation)
Each press 10 performs press processing according to each cash mold. After the completion of processing, the work conveyed by the work conveying device 20 of FIG. 2 using the current tool 65A (current crossbar 61A) is conveyed from the pre-press 10U to the post-press 10D. This press work and workpiece conveyance are repeated. The dimension in the X direction of the notch 101 provided in the floor board member 100 is the minimum opening selected to be able to penetrate the narrow connecting member 48 shown in FIG. Therefore, it is possible to prevent the scrap from being scattered under the floor by press working. During the press operation (machining), the tool changer 30 is located outside the machine 105 shown in FIGS. 1 and 2A. The lifting / lowering means 70 and the intermediate positioning means 81 are operated outside the machine 105 to raise the crossbar stacking portion 31 (33D, 33U) to the intermediate position (LM) shown in FIGS. 2 (A) and 4 (A).

(Preparation of the next tool)
During the press operation, outside the machine 105, the operator loads the next cross bar 61A (next tool 65A) on the other load receiving portions 33U and 33U shown in FIG. That is, the next tool 65A can be prepared in advance. Before and after this, the current crossbar 61B (current tool 65B) first carried out from one of the stack receiving portions 33D and 33D [specifically, the current crossbar 61 one step before the current press step, that is, the current progress. The current crossbar 61... The old current crossbar 61] in the press process immediately before the middle press process is removed. The tool replacement work on the outside 105 is completed. Note that the current tool 65B is removed from the current crossbar 61B loaded on one of the stacking receiving portions 33D and 33D, the current crossbar 61B is transferred to the other stacking receiving portions 33U and 33U, and the current crossbar 61B is moved to the next crossbar 61B. The tool may be exchanged outside the machine 105 by attaching the tool 65A to the next cross bar 61A. In any case, since the crossbar stacking portion 31 (33D, 33U) is positioned at the ideal intermediate position (LM) shown in FIGS. 2A and 4A, the posture is easy and easy. You can work efficiently. Because there is time, you can do it accurately and safely. Errors such as tool mix-ups can be eliminated. After completion of the work, the intermediate positioning means 81 (intermediate position stopper 83) is released and the elevating means 70 is moved downward to move the crossbar stacking portion 31 (33D, 33U) from the intermediate position (LM) in FIG. It is lowered to the low position (LL) shown in FIG. At any time, it can be conveyed between the presses 11.

(Press stop)
When a stop command for press operation (machining) is issued, the workpiece transfer device 20 is stopped between presses 11. As shown in FIG. 2A, the work transfer device 20 holds the current crossbar 61B. In this embodiment, when the feeder arm 21 is lowered, the connection holding portions 25 and 25 are positioned and stopped so as to correspond to the stack receiving portions 33D and 33D of the tool changer 30 to be carried in. Note that the mold on the bolster 14 can be carried out of the machine 104 by moving each mold exchanging device 15 in the Yd direction of FIG.

(Carrying in tool changer)
When there is a tool change request, during the press stop period, the tool changer 30 loaded with the next cross bar 61A travels in the Yt direction with the low position (LL) as shown in the left half of FIG. Then, it is carried from the outside 105 into the space 11 between the presses. The right half shows the state after loading. The carrying-in of the cross bar 61A is reverse to the carrying out of the mold, but can be performed separately from the carrying in / out of the mold. The carrying out of the cross bar 61B and the carrying out of the mold are also independent.

(Delivery of the current tool)
Between the presses 11, the lifting means 70 is activated to raise the crossbar stacking portion 31 (33D, 33U) from the low position (LL) in FIG. 4B to the high position (LH) shown in FIG. That is, the state shown in the right half of FIG. 3B is switched to the state shown in the left half. Here, the feeder driving device 22 is activated to lower the workpiece transfer device 20 (feeder arm 21), and the current crossbar 61B is brought close to the tool changer 30 (one of the stack receiving portions 33D and 33D). At this time, for example, even if the workpiece transfer device 20 is moved downward by an amount corresponding to the amount of contraction due to the shrinkage of the vibration isolator due to the weight of the mold, the crossbar stacking unit 31 (33D, 33U) is Since the floating means 90 (spring 91) is used to hold the floating, it can be loaded without shock. Subsequently, the auto tool changer (connection holding unit 25) is operated to release the connection to release the connection with the connection unit 62, whereby the current crossbar 61B (the current tool 65B) can be delivered to the tool changer 30. The planar position is accurately regulated by the position regulation pin member 34. From the tool changer 30 side, the current crossbar 61B (current tool 65B) can be accepted. The empty feeder arm 21 is returned to the upper fixed position.

(Accept the next tool)
The feeder driving device 22 is activated again to lower the workpiece transfer device 20 (feeder arm 21). Before and after this, the conveying member is slightly swung by the action of the automatic loading position switching control means 23, and the loading position is switched so that the connection holding portion 25 corresponds to the other loading receiving portions 33U and 33U. Therefore, this time, the empty feeder arm 21 (connection holding unit 25) is brought closer to the tool changer 30 (33U, 33U). Also at this time, the crossbar stacking portion 31 (33U) is floated and held at a position corresponding to the contraction amount by the action of the floating means 90 (spring 91), so that the next crossbar 61A (next tool 65A) Can be accurately positioned. Then, the auto tool changer (connection holding portion 25) is connected and held this time to connect to the connection portion 62. Thereby, the next cross bar 61A (next tool 65A) can be delivered from the tool changer 30 to the work transfer device 20 side. When viewed from the workpiece transfer device 20 side, the next crossbar 61A (next tool 65A) can be received (received) from the tool changer 30 side. Thereafter, the feeder arm 21 is returned to the upper fixed position. Thus, the cross bar 61 of the workpiece transfer device 20 was able to be replaced. As far as the relationship with the tool replacement work is concerned, the press work (operation) can be resumed with the next crossbar 61A (next tool 65A) replaced after this point as the current crossbar 61B (current tool 65B).

(Carrying out the tool changer)
After the delivery of the next crossbar 61A (next tool 65A), the elevating means 70 is activated to move the crossbar stacking portion 31 (33D, 33U) from the high position (LH) in FIG. 4C to the low position in FIG. Lower to position (LL). That is, the state shown in the left half of FIG. 3B is switched to the state shown in the right half. Thereafter, the tool changer 30 loaded with the current crossbar 61B [specifically, the above-described old current crossbar 61] is moved in the Yt direction [direction (←) opposite to the direction (→) shown in FIG. 2B]]. To the outside of the machine 105. This unloading can also be performed independently from the unloading / unloading of the mold exchanging device 15.

(Tool replacement work outside the machine)
Between the time when the press is stopped and the time when it is necessary to replace the cross bar of the next work transfer device 20, the operator moves the current cross bar 61B (current tool 65B) that has been unloaded [specifically, the above-described old current The cross bar 61 (current tool 65)] is removed from one of the stack receiving portions 33D and 33D, and the other cross receiving portion 33U and 33U of the tool changer 30 shown in FIG. ) [Specifically, the next cross bar 61 (next tool 65), which becomes a new current cross bar in the subsequent (next) pressing process with respect to the pressing process currently in progress]. That is, a tool (next tool 65A) scheduled to be used in the next process with respect to the current press process can be prepared in advance as in the case of (Preparation of next tool).

(Carrying out the mold changer)
When the press is stopped and there is a mold replacement request, the mold exchanging device 15 is moved in the Yd direction shown in FIG. 1, and the bolster (mold) 14 is carried out of the press (10) to the outside 104. There is no slight effect on loading / unloading of the tool changer 30.

(Mold exchange work outside the machine)
At the outside of the machine 104, the cash mold set in the bolster 14 is removed and replaced with the next mold. Since the place and position of the tool change work are separated, this mold change work does not induce problems (complexity and difficulty of the tool change work) in the case of the conventional example 1.

(Delivery of mold changer)
The bolster 14 in which the next mold is set is carried from the outside 104 into the press (10). This completes the mold exchanging work. Since the tool change work and the die change work are not sequentially executed in time series, the press stop time including the die change work and the tool change work can be minimized. Therefore, the next product can be quickly produced. Cost can be reduced by shortening the time.

  Thus, according to this embodiment, the next cross bar 61A (65A) is prepared in the tool changer 30 (33U) outside the machine 105, and is carried into the space 11 between the outside machine 105 while the press is stopped. After the carry-in, the current crossbar 61B (65B) is delivered from the work transfer device 20 to the tool changer 30 (33D), and then the next crossbar 61A (65A) loaded is delivered to the work transfer device 20, and then the takeover is performed. Since the tool changer 30 loaded with the current crossbar 61B (65B) is unloaded from the machine 105 and the tool change operation is completed, tool change in the tandem press system can be performed quickly and productivity is improved. Can greatly improve. In particular, it can greatly contribute to the improvement of the productivity of a system used for various kinds of small-volume production.

  Further, the tool changer 30 can be carried into and out of the machine 105 in the Yt direction from between the presses independently from the carry-in / out of the die (bolster 14) to the machine 104 in the Yd direction. Two crossbars 61 (61B, 61A) can be stacked at the same time on the crossbar stacking unit 31 (33D, 33U), and the current crossbar 61B can be delivered from the workpiece transfer device 20 to the tool changer 30 while the press is stopped. Further, the next cross bar 61A is formed so as to be able to be transferred from the tool changer 30 to the work transfer device 20, and the tool changer 30 that has received the current crossbar 61B is unloaded from the machine 105 and removed from one of the stack receiving portions 33D. Since the next crossbar 61A can be stacked on the other stacking receiving portion 33U, it is possible to smoothly carry out the tool changing method. It is possible to provide a location. The device is easy to implement and easy to handle.

  In addition, the stacking position automatic switching control means 23 can switch and position the connection holding portion to one stack receiving portion 33D when handing over the current crossbar 61B and to the other stack receiving portion 33U when receiving the next crossbar 61A. The crossbar 61 can be delivered and accepted more accurately and quickly.

  Further, since the crossbar stacking portion 31 of the tool changer 30 can move up and down following the change in the vertical position of the work transfer device 20 when the crossbar 61 is stacked, the crossbar 61 is stacked without shock. be able to.

  Moreover, since the workpiece conveyance apparatus 20 is supported by the foundation 200 via the vibration isolator 201, it can also follow the vertical position change on the workpiece conveyance apparatus side.

  Furthermore, since the tool changer 30 includes a crossbar loading part 31, a carriage 55, a connecting member 47, and a travel drive part 58 and is formed so as to be movable up and down with respect to the carriage 55 (base 200), Tool change work can be done with a natural and easy posture.

  Furthermore, since the crossbar stacking unit 31 can be moved up and down in three stages: a low position when the carriage is running, an intermediate position when the tool is changed, and a high position when the crossbar is delivered, the carriage 55 is stabilized and the crossbar 61 is delivered. Stabilization can be promoted.

  Furthermore, the carriage 55 and the travel drive unit 58 are disposed below the floor plate member 100, and the floor plate member 100 is formed with a pair of cut portions 101 having a narrow dimension in the X direction and extending in the Yt direction, Since the connecting member 47 is formed of two or more plate-like members that can move in a state of penetrating the notch 101, it can be applied even when the distance between the presses is small, and scrap processing is easy.

  Furthermore, when the apparatus according to this embodiment is compared with the conventional example, a system having a narrow press-to-press pitch as in the case of the conventional example 2 is easy as in the case of the conventional example 2 as well as in the case of the conventional example 1. It can also be applied to. In addition, the mold changing work and the tool changing work are not performed sequentially in time series as in Conventional Example 1, and are not reciprocated twice as in Conventional Example 2, so that the mold changing work and tool changing are not performed. Both work and work can be accelerated. In addition, there is no risk of forcing an unreasonable posture for tool replacement work.

  Compared to the case of the conventional example 2, the space on the press side (side opening) can be increased even if the access within the press is facilitated. Tool change work at the off-site workshop does not interfere with tool change work. The tool can be changed separately from the mold change.

  Furthermore, as compared with the cases of the conventional example 1 and the conventional example 2, the next crossbar can be prepared before the current crossbar is carried out. That is, the replacement work can be performed accurately and carefully with a time margin. This can also dramatically improve the productivity of the entire tandem press system, and can greatly contribute to a variety of small-quantity production in which die change work is frequently performed.

DESCRIPTION OF SYMBOLS 1 Tandem press system 10 Press 11 Between presses 14 Bolster 15 Die change apparatus 20 Work conveyance apparatus 23 Loading position automatic switching control means 30 Tool change apparatus 31 Crossbar loading part 33 Loading receiving part 41 Apparatus main body 47 Connecting member 51 Cart 61 Cross Bar 70 Elevating means 90 Floating means 100 Floor board member 101 Cutting part 105 Outside the machine

Claims (8)

Tandem press formed so that the workpiece can be transferred from the pre-press arranged in the workpiece transfer direction to the post-press using the workpiece transfer device and the tool mounted on the workpiece transfer device can be changed using the tool changer. A system tool change method,
The next crossbar in which the next tool is mounted on one or the other load receiving portion of the tool changer outside the machine in the tool change direction perpendicular to the workpiece transfer direction is loaded,
Carrying the tool changer loaded with the next crossbar while the press is stopped between the front press and the post press from outside the machine;
During the press, the current crossbar in which the current tool is mounted is delivered from the work transfer device to any empty stack receiving portion of the tool changer,
Next, the next crossbar loaded on the one or the other load receiving portion is delivered to the work transfer device,
Thereafter, the tool changer loading the current crossbar received from the workpiece transfer device on the other or one of the load receiving portions is carried out of the machine, and the tool mounted on the workpiece transfer device is removed. A tool exchange method for a tandem press system, characterized in that the exchange work is terminated. Using a plurality of presses arranged in the workpiece conveyance direction, a workpiece conveyance device that conveys a workpiece from a front press to a rear press using a tool mounted via a cross bar, and a tool mounted on the workpiece conveyance device In a tandem press system comprising a tool changer for changing,
The tool changer can be carried in and out of the machine in the tool change direction orthogonal to the work transfer direction from between the press between the front press and the post press and is orthogonal to the work transfer direction of the bolster on which the mold is set. Formed so that loading and unloading can be done independently of the mold exchange direction.
The crossbar stacking section of the tool changer is provided with two stacking receiving sections arranged in parallel in the workpiece transfer direction, and two crossbars can be stacked at the same time,
Between the presses when the press is stopped, the current crossbar with the current tool mounted to any empty stack receiving portion of the tool changer can be delivered from the work transfer device and one or the other of the tool changer Forming the next crossbar with the next tool mounted on the work transfer device from the load receiving portion so that it can be delivered,
The tool changer that has accepted the current crossbar can be taken out of the machine in the tool change direction, and the current crossbar can be removed from the other or one of the load receiving portions outside the machine, and then the other or the other load can be loaded. A tandem press system that can be loaded with the next crossbar in the receiving part.   In the case of delivering the current crossbar, the connection holding part of the workpiece transfer device is positioned at one of the empty stacking receiving parts, and when the next crossbar is received, it is the one or the other loading receiving part and the next crossbar. The tandem press system according to claim 2, further comprising a loading position automatic switching control means for positioning the bar on a side where the bar is loaded.   The crossbar stacking portion of the tool changer is configured to be movable up and down following a change in the vertical position of the work transfer device when the crossbar is stacked. Tandem press system.   The tandem press system according to claim 4, wherein the workpiece transfer device is supported on a foundation via a vibration isolator capable of changing a vertical position directly or indirectly.   The tool changer includes the crossbar stacking unit, a cart capable of traveling along a traveling rail extending in the tool changing direction, a connecting member for connecting the crossbar stacking unit to the cart, and a travel drive unit; The tandem press system according to any one of claims 2 to 5, wherein the crossbar loading portion is formed to be movable up and down with respect to the carriage.   The crossbar stacking part is formed so as to be able to be moved up and down in three stages: a low position when the carriage is running, an intermediate position when the tool is exchanged outside the machine, and a high position when the crossbar is delivered between the presses. The tandem press system according to claim 6.   The carriage and the travel drive unit are disposed below a floor plate member, and the floor plate member is formed with a pair of notches that are narrow in the workpiece transfer direction and extend in the tool exchange direction, The tandem press system according to claim 6 or 7, wherein the connecting member is formed of two or more plate-like members that are movable in the tool changing direction in a state of penetrating the notch.

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