JP2016128180A - Safety device for press brake and press brake - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve workability of optical axis adjustment of a safety device 23 for a press brake.SOLUTION: A fitting mechanism 29 for fitting a light projector 25 or a light receiver 27 to an upper table 17 comprises: a support member 33 which can be disposed in the upper table 17 and extends in a vertical direction; a slide member 41 which is provided in the support member 33 in a vertically movable manner, and has a fixture 43 to which the light projector 25 or the light receiver 27 can be fitted; a ball screw 45 which is provided in the support member 33 and extends in the vertical direction; a ball nut 49 which is screwed to the ball screw 45 and connected to the slide member 41; and an operation handle 73 having a drive shaft 75 that can be connected to the ball screw 45. The operation handle 73 is configured to switch the ball screw 45 between a rotatable state and an unrotatable state while the drive shaft 75 is connected to the ball screw 45.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a safety device for a press brake and the like used for a press brake and for monitoring the entrance or approach of foreign matter other than a workpiece between an upper die (upper die) and a lower die (lower die).

  In recent years, various developments have been made on press brakes, and the general configuration of a press brake will be described as follows.

  The press brake has a main body frame, and a lower table is provided at the lower part of the main body frame, and the lower mold can be attached to and detached from the upper side (the upper side of the lower table). It is to hold. In addition, an upper table is provided on the upper part of the main body frame so as to face the lower table in the vertical direction, and the upper table is movable up and down (movable up and down) relative to the lower table. The upper mold is detachably held on the lower side (lower side of the upper table).

  The press brake includes a press brake safety device for monitoring the ingress or approach of foreign matter other than the workpiece between the upper die and the lower die. The press brake safety device includes a projector that projects monitoring light from one side of the upper table in the width direction to the other side, a receiver that receives monitoring light from the projector, and a width direction of the upper table. An attachment mechanism that can be disposed (installable) on both sides and that attaches the light projector or the light receiver to the upper table is provided. And the concrete structure of an attachment mechanism is as follows.

  That is, the mounting mechanism includes a mounting arm that can be disposed (disposed) on the upper table and protrudes in the horizontal direction. In addition, a movable support member (support member) extending in the vertical direction is provided at the tip of the mounting arm, and this movable support member is movable in the vertical direction (position adjustment is possible), and is On the side (the lower side of the movable support member), there is a mounting portion on which a projector or a light receiver can be mounted. Further, a clamp lever which can be rotated is provided at an appropriate position of the movable support member, and this clamp lever fixes the movable support member to the mounting arm by a rotation operation.

  In addition, as a prior art relevant to this invention, there exist some which are shown to patent document 1-patent document 3. FIG.

JP 2007-203310 A JP 2007-181875 A JP 2001-259744 A

  By the way, when the height position of the upper mold (the lower end of the upper mold) relative to the upper table changes due to the mold replacement, the monitoring range (protection range) by the monitoring light also changes. And adjustment of the height position of the light receiver, in other words, adjustment of the optical axis of the press brake safety device (adjustment of the height of the optical axis of the monitoring light). In order to adjust the optical axis of the safety device for a press brake, it is necessary to move the clamp lever with the other hand while moving the projector or light receiver to a predetermined height while supporting it with the other hand. I need it. For this reason, there is a problem that it takes a lot of labor and time to adjust the optical axis of the press brake safety device, and it is not easy to improve the workability of the optical brake adjustment of the press brake safety device.

  Therefore, an object of the present invention is to provide a press brake safety device and the like having a novel configuration that can solve the above-described problems.

  A first feature of the present invention is a lower table provided at a lower portion of a main body frame and holding a lower mold on an upper side thereof, and provided at an upper portion of the main body frame so as to face the lower table vertically. Used in a press brake having an upper table that holds the upper mold on the lower side and is movable in a vertical direction relative to the upper mold and the lower mold. In a press brake safety device for monitoring the entry or approach of foreign matter other than the above, a projector that projects monitoring light from one side in the width direction of the upper table toward the other side, and monitoring light from the projector A light receiver that can receive light and can be disposed (installable) on both sides of the upper table in the width direction, for mounting the projector or the light receiver on the upper table. Each mounting mechanism can be disposed on the upper table, and is provided with a support member extending in the vertical direction and movable in the vertical direction (position adjustment is possible) on the support member. , A slide member having a mounting portion to which the light projector or the light receiver can be mounted, a screw member provided on the support member and extending in the vertical direction, and screwed into the screw member (in a screwed state) A nut member connected to the slide member and a drive shaft (connection shaft) connectable to the screw member, and the screw member can be rotated while the drive shaft is connected to the screw member. And an operation handle that is configured to be switched between a non-rotating state (free state) and a non-rotatable state (locking state).

  In the description of the specification and claims of the present application, “provided” means not only directly provided but also indirectly provided through another member. In addition, “installable” means that it can be directly disposed (installable) and can be indirectly disposed (installable) via another member. . Further, the “width direction” means the width direction of the press brake, in other words, the width direction of the upper table or the lower table, and “foreign matter” means a part of an operator or an obstacle in the factory. It is meant to include. The term “connection” includes not only direct connection but also indirect connection. “Fixed” is different from the fact that it is directly fixed. It is meant to include being indirectly fixed through a member.

  According to the first feature of the present invention, during the operation of the press brake, monitoring light is projected from one side in the width direction of the upper table to the other side by the light projector, and the monitoring is performed by the light receiver. Light is received and the amount of light received by the light receiver is detected (monitored). Thereby, it is possible to monitor the entry or approach of foreign matter between the upper mold and the lower mold. If the monitoring light projected from the projector is obstructed by a foreign object and the amount of light received by the light receiver is reduced, an emergency measure such as stopping the operation of the press brake is taken.

  When the height position of the upper mold (lower end of the upper mold) with respect to the upper table is changed by mold replacement (exchange of the upper mold), the drive shaft is connected to the screw member Thus, the screw member is switched from the non-rotatable state to the rotatable state by the operation handle. Then, by rotating the screw member by rotating the operation handle, the slide member is moved in the vertical direction, and the projector or the light receiver is moved to a predetermined height corresponding to the height position of the upper mold. The position is set at a predetermined position (a predetermined height position with respect to the upper table). Further, in a state where the drive shaft is connected to the screw member, the screw member is switched from the rotatable state to the non-rotatable state by the operation handle, and the projector or the light receiver is moved to a predetermined height position. Secure to. That is, by the above-described operation, the optical axis adjustment (adjustment of the optical axis of the monitoring light) of the press brake safety device can be performed without supporting the projector or the light receiver with one hand.

  A second feature of the present invention is a press brake that performs bending on a workpiece by cooperation of an upper die (upper die) and a lower die (lower die), and the press according to the first feature of the invention. The gist is that a brake safety device is provided.

  According to the 2nd characteristic of this invention, there exists an effect | action similar to the effect | action by the 1st characteristic of this invention.

  According to the present invention, since the optical axis of the press brake safety device can be adjusted without supporting the projector or the light receiver with one hand, the optical axis adjustment of the press brake safety device is complicated. Therefore, the workability of adjusting the optical axis of the press brake safety device can be improved.

FIG. 1 is an enlarged view of an arrow I in FIG. FIG. 2 is an enlarged view of the arrow II in FIG. 3A is a cross-sectional view showing a state in which the movable lock member is connected to the fixed lock member, and FIG. 3B is a cross-sectional view showing a state in which the connection state between the movable lock member and the fixed lock member is released. is there. 4A is an enlarged sectional view taken along line IVA-IVA in FIG. 3B, and FIG. 4B is an enlarged sectional view taken along line IVB-IVB in FIG. 3B. FIG. 5 is a front view of the press brake according to the embodiment of the present invention. FIG. 6 is a side view of the press brake according to the embodiment of the present invention.

  Embodiments of the present invention will be described with reference to the drawings. In the drawings, “FF” is the forward direction, “FR” is the backward direction, “L” is the left direction, “R” is the right direction, “U” is the upward direction, and “D” is the upward direction. Pointing down each.

  As shown in FIGS. 5 and 6, the press brake 1 according to the embodiment of the present invention has a plate-like workpiece (metal plate) by cooperation of an upper die (upper die) 3 and a lower die (lower die) 5. ) Bending is performed on W, and the main body frame 7 is used as a base. The main body frame 7 includes a pair of side plates 9 that are spaced apart from each other in the width direction (left and right direction), and a plurality of connecting members 11 that connect the pair of side plates 9.

  A lower table 13 extending in the width direction is provided at the lower part of the main body frame 7. The lower table 13 has a lower mold 5 and a lower mold holder 15 on the upper side (upper side of the lower table 13). And is detachably held. An upper table 17 extending in the width direction is provided on the upper portion of the main body frame 7 so as to face the lower table 13 in the vertical direction, and the upper table 17 is movable in the vertical direction (can be moved up and down). The upper mold 3 is detachably held via a plurality of upper mold holders 19 below (under the upper table 17). Further, a hydraulic cylinder 21 for moving the upper table 17 in the vertical direction is provided on the upper side of each side plate 9. Instead of configuring the upper table 17 to be movable in the vertical direction, the lower table 13 may be configured to be movable in the vertical direction.

  The press brake 1 is equipped with a press brake safety device 23 for monitoring the entry or approach of foreign matter other than the workpiece W between the upper die 3 and the lower die 5. The press brake safety device 23 includes a projector 25 that projects a laser beam LB as monitoring light from one side (left direction) in the width direction of the upper table 17 toward the other side (right direction), and a projector 25. Can be disposed (installable) on both sides (left and right sides) of the upper table 17 in the width direction, and the light projector 25 or the light receiver 27 is attached to the upper table 17. And an attachment mechanism 29 for the purpose. The details of the configuration of the attachment mechanism 29 according to the embodiment of the present invention are as follows.

  As shown in FIGS. 1 and 2, the mounting mechanism 29 includes a mounting arm 31 that can be disposed (disposed) on the upper table 17 and protrudes in the horizontal direction. Is provided with a support member 33 extending vertically. In other words, the attachment mechanism 29 includes the support member 33 that can be disposed on the upper table 17 via the attachment arm 31 and extends in the vertical direction. Most of the support member 33 has a box shape, and the support member 33 is detached from the upper table 17 when viewed from the side of the press brake 1 (one side or the other side in the width direction). It is designed to be located in the area. Further, a mounting bracket (mounting plate) 35 is formed on the support member 33, and a mounting hole (mounting hole) 37 is formed through the mounting bracket 35 (formed in a penetrating state). .

  A pair of guide members 39 extending in the vertical direction are provided on the front surface of the support member 33, and a slide member 41 is provided on the pair of guide members 39 so as to be movable in the vertical direction (position adjustment is possible). Yes. In other words, the support member 33 is provided with the slide member 41 movably in the vertical direction via the pair of guide members 39. Moreover, the slide member 41 has a plurality of mounting tools 43 as mounting portions to which the projector 25 or the light receiver 27 can be mounted.

  The support member 33 is provided with a ball screw (an example of a screw member) 45 extending in the vertical direction via a pair of bearings 47. Further, the ball screw 45 is configured to be switchable between a rotatable state (free state) and a non-rotatable state (locked state) around the axis of the ball screw 45. Further, a ball nut (an example of a nut member) 49 is screwed (in a screwed state) to the ball screw 45, and the ball nut 49 is integrally connected to the slide member 41. .

  As shown in FIGS. 1, 3 (a), (b), and FIGS. 4 (a) and 4 (b), a hollow transmission shaft 51 extending in the horizontal direction is provided on the upper portion of the support member 33. The transmission shaft 51 is linked to the ball screw 45 via a pair of bevel gears 55. In addition, the transmission shaft 51 can be switched between a state where the transmission shaft 51 can rotate around the axis of the transmission shaft 51 (free state) and a state where it cannot rotate (lock state). Furthermore, a slit 57 extending in the axial direction (the axial direction of the transmission shaft 51) is formed at one end of the transmission shaft 51.

  An annular fixed lock member (first connecting member) 59 is fixed (provided integrally) to the mounting bracket 35 which is a part of the support member 33, and the fixed lock member 59 on the transmission shaft 51 side is fixed. A plurality of engagement holes 61 are formed on the surface at equal intervals along the circumferential direction (predetermined circumferential direction). At one end of the transmission shaft 51, a circular movable lock member (second connection member) 63 that can be connected to the fixed lock member 59 is movable in the axial direction of the transmission shaft 51 and faces the fixed lock member 59. Is provided. A part of the movable lock member 63 is inserted into the slit 57 of the transmission shaft 51, and the movable lock member 63 is not rotatable around the axis of the transmission shaft 51. Furthermore, a plurality of engaging protrusions 65 that can be engaged with the corresponding engaging holes 61 are formed on the surface of the movable lock member 63 on the fixed lock member 59 side at equal intervals along the circumferential direction. A hexagonal connection hole 67 is formed through the central portion of the lock member 63.

  An annular spring seat 69 is provided between the mounting bracket 35 and the fixed lock member 59, and the spring seat 69 is rotatable about its axis (axis of the spring seat 69). . One end of a spring (an example of a biasing member) 71 that biases the movable lock member 63 toward the fixed lock member 59 is integrally joined (connected) to the spring seat 69. The other end is integrally joined (connected) to the movable lock member 63.

  An operation handle 73 that can be rotated is detachably provided in the mounting hole 37 of the mounting bracket 35. The operation handle 73 has a drive shaft (connection shaft) 75 having a hexagonal tip. doing. Further, the distal end portion of the drive shaft 75 can be connected to the movable lock member 63 by being fitted into the connection hole 67 of the movable lock member 63. In other words, the tip of the drive shaft 75 can be connected to the transmission shaft 51 via the movable lock member 63, and can be connected to the ball screw 45 via the movable lock member 63 and the transmission shaft 51. . Furthermore, a stepped portion 77 that can be connected to the spring seat 69 is formed in the middle portion of the drive shaft 75 of the operation handle 73.

  Here, as shown in FIGS. 1 and 2A and 2B, when the operating handle 73 is pressed toward the transmission shaft 51 in a state where the tip of the drive shaft 75 is connected to the movable lock member 63, the movable lock The member 63 moves against the urging force of the spring 71 to the opposite side of the fixed lock member 59 side, and the engagement state of the engagement hole 61 corresponding to each engagement protrusion 65 is released. Then, the connection state of the movable lock member 63 and the fixed lock member 59 is released, and the transmission shaft 51 and the ball screw 45 can be rotated (free state). Further, when the pressing state with respect to the operation handle 73 is released, the movable lock member 63 is moved to the fixed lock member 59 side by the biasing force of the spring 71, and each engagement protrusion 65 is correspondingly engaged by the biasing force of the spring 71. 61 is engaged. Then, the movable lock member 63 is connected to the fixed lock member 59 by the urging force of the spring 71, and the transmission shaft 51 and the ball screw 45 are in a non-rotatable state (lock state). In other words, the operation handle 73 has a state in which the transmission shaft 51 and the ball screw 45 can be rotated (free state) and a state in which the operation shaft 73 cannot rotate (the locked state) with the distal end portion of the drive shaft 75 connected to the movable lock member 63. ) And to switch to.

  As shown in FIGS. 1 and 2, the upper position of the support member 33 has a height position of the light projector 25 or the light receiver 27 with respect to the upper table 17 based on the rotational speed of the ball screw 45, in other words, a height position of the laser beam LB. Encoder (an example of a height position detector) 79 is detected. Further, an indicator 81 that displays the height position of the projector 25 or the light receiver 27 is provided above the support member 33, and is displayed on the indicator 81 in the vicinity of the indicator 81 in the support member 33. A reset button 83 is provided for resetting the value.

  Then, the effect | action and effect of embodiment of this invention are demonstrated.

  The workpiece W is moved in the front-rear direction (the depth direction of the press brake 1) and positioned with respect to the lower mold 5. Then, the upper table 17 is moved (lowered) downward by driving the pair of hydraulic cylinders 21. As a result, the plate-like workpiece W can be bent by the cooperation of the upper die 3 and the lower die 5.

  During the operation of the press brake 1, the laser beam LB is projected from the one side (left direction) in the width direction of the upper table 17 toward the other side (right direction) by the light projector 25, and the laser light LB is projected by the light receiver 27. Is detected and the amount of light received by the light receiver 27 is detected (monitored). Thereby, it is possible to monitor the entry or approach of foreign matter between the upper mold 3 and the lower mold 5. If the laser beam LB projected from the projector 25 is blocked by foreign matter and the amount of light received by the light receiver 27 decreases, the operation of the press brake 1 (downward movement of the upper table 17) is stopped. Emergency measures will be taken.

  When the height position of the upper mold 3 (lower end of the upper mold 3) with respect to the upper table is changed by the mold exchange (replacement of the upper mold 3), the operation handle 73 is a part of the support member 33. The tip end of the drive shaft 75 is connected to the movable lock member 63 by being attached to the attachment hole 37 of the mounting bracket 35. Next, by pressing the operation handle 73 toward the transmission shaft 51, the connection state of the movable lock member 63 and the fixed lock member 59 is released, and the transmission shaft 51 and the ball screw 45 are rotated from a non-rotatable state (lock state). Switch to a possible state (free state). Then, while confirming the height position of the projector 25 or the light receiver 27 displayed on the display 81, the transmission shaft 51 and the ball screw 45 are rotated by rotating the operation handle 73, thereby moving the slide member 41 in the vertical direction. The projector 25 or the light receiver 27 is moved to a predetermined height position corresponding to the height position of the upper mold 3 (a predetermined height position with respect to the upper table 17). Further, the movable lock member 63 is connected to the fixed lock member 59 by the urging force of the spring 71 by releasing the pressing state with respect to the operation handle 73 in a state where the distal end portion of the drive shaft 75 is connected to the movable lock member 63. The transmission shaft 51 and the ball screw 45 are switched from a rotatable state to a non-rotatable state, and the light projector 25 or the light receiver 27 is fixed at a predetermined height position. That is, by the above-described operation, the optical axis adjustment of the press brake safety device 23 (adjustment of the optical axis of the laser beam LB) can be performed with high accuracy without supporting the projector 25 or the light receiver 27 with one hand. .

  After adjusting the optical axis of the press brake safety device 23, the operation handle 73 is removed from the mounting hole 37 of the mounting bracket 35.

  Therefore, according to the embodiment of the present invention, the optical axis of the press brake safety device 23 can be adjusted with high accuracy without supporting the projector 25 or the light receiver 27 with one hand. The complexity of the optical axis adjustment of the device 23 can be suppressed, and the workability of the optical axis adjustment of the press brake safety device 23 can be improved. In particular, by making the outer diameter portion of the operation handle 73 larger, the lever principle can be effectively utilized, and the workability of the optical axis adjustment of the press brake safety device 23 can be further improved.

  After adjusting the optical axis of the press brake safety device 23, the operation handle 73 is removed from the mounting hole 37 of the mounting bracket 35, so that the press brake safety device 23 and obstacles can be removed during operation of the press brake 1. The space around the press brake 1 can be effectively used while sufficiently preventing such interference.

  In addition, this invention is not restricted to description of the above-mentioned embodiment, It can implement in a various aspect by making an appropriate change. Further, the scope of rights encompassed by the present invention is not limited to the above-described embodiment.

LB laser light (monitoring light)
W Work 1 Press brake 3 Upper mold 5 Lower mold 7 Main body frame 9 Side plate 13 Lower table 15 Lower mold holder 17 Upper table 19 Upper mold holder 21 Hydraulic cylinder 23 Safety device 25 for press brake Light projector 27 Light receiver 29 Mounting mechanism 31 Mounting arm 33 Support member 35 Mounting bracket 37 Mounting hole 39 Guide member 41 Slide member 43 Mounting tool (mounting portion)
45 Ball screw (screw member)
49 Ball nut (nut member)
51 Transmission shaft 57 Slit 59 Fixed lock member 61 Engagement hole 63 Movable lock member 65 Engagement protrusion 67 Connection hole 69 Spring seat 71 Spring (biasing member)
73 Operation handle 75 Drive shaft 77 Stepped portion 79 Encoder (height position detector)
81 Display 83 Reset button

Claims (8)

A lower table provided at a lower portion of the main body frame and holding a lower mold on the upper side; and provided at an upper portion of the main body frame so as to be opposed to the lower table in the vertical direction and relatively vertically with respect to the lower table. Used for press brakes that are movable and have an upper table that holds the upper mold on the lower side, and monitors the entry or approach of foreign objects other than workpieces between the upper mold and the lower mold. In the safety device for press brake to
A projector that projects monitoring light from one side in the width direction of the upper table toward the other side;
A receiver for receiving the monitoring light from the projector;
A mounting mechanism that can be disposed on both sides of the upper table in the width direction, and for mounting the projector or the light receiver to the upper table,
Each mounting mechanism
A support member that can be disposed on the upper table and extends in a vertical direction;
A slide member provided on the support member so as to be movable in the vertical direction, and having a mounting portion to which the projector or the light receiver can be mounted;
A screw member provided on the support member and extending in the vertical direction;
A nut member screwed to the screw member and connected to the slide member;
A drive shaft connectable to the screw member, and configured to switch the screw member between a rotatable state and a non-rotatable state in a state where the drive shaft is connected to the screw member, and is rotatable. And a safety device for a press brake, comprising: an operation handle. Each mounting mechanism
Provided on the support member, comprising a transmission shaft interlocked to the screw member,
The safety device for a press brake according to claim 1, wherein the drive shaft is connectable to the transmission shaft. Each mounting mechanism
A fixed locking member fixed to the support member;
A movable lock member that is movable in the axial direction of the transmission shaft and is opposed to the fixed lock member, is non-rotatable about an axis of the transmission shaft, and is connectable to the fixed lock member;
A biasing member that biases the movable lock member toward the fixed lock member,
The press brake safety device according to claim 2, wherein the drive shaft is connectable to the movable lock member.   When the operating handle is pressed toward the transmission shaft while the drive shaft is connected to the movable lock member, the connection state of the movable lock member and the fixed lock member is cut off, and the transmission shaft and the screw member are moved. When the pressing state of the operation handle is released, the movable lock member is connected to the fixed lock member by the urging force of the urging member, and the transmission shaft and the screw member are switched. The safety device for a press brake according to claim 3, wherein the motor is switched to a non-rotatable state.   When the operation handle is pressed toward the transmission shaft in a state where the drive shaft is connected to the transmission shaft, the transmission shaft and the screw member are switched to a rotatable state. 3. The press brake safety device according to claim 2, wherein when the state is released, the transmission shaft and the screw member are switched to a non-rotatable state.   The press brake safety device according to any one of claims 1 to 5, wherein the operation handle is detachable from the support member. Each mounting mechanism
A height position detector for detecting a height position of the light projector or the light receiver with respect to the upper table;
7. The display device according to claim 1, further comprising a display that displays a height position of the projector or the light receiver detected by the height position detector. 8. The safety device for press brakes as described. In press brakes that bend the workpiece by the cooperation of the upper mold and the lower mold,
A press brake comprising the press brake safety device according to any one of claims 1 to 7.

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