JPH0216806Y2 - - Google Patents

Description

[Detailed Description of the Invention] a. Field of Industrial Application The present invention relates to a plate tracking device that follows and supports the jump of a plate that is bent by a press brake.

b. Prior Art When a plate is bent into a V-shape using a press brake, the edge of the plate quickly jumps up, which is dangerous. Furthermore, if the clamping pressure on the plate material by the upper and lower dies of the press brake is released in order to take out the plate material after the bending is completed, the plate material bent into a V shape may fall down, which is dangerous. Furthermore, if the plate material is relatively thin, a so-called bending phenomenon may occur when the plate material is bent.

Therefore, in the past, various follow-up devices have been developed that support the board by following the rise of the board during bending.

c. Problems to be solved by the invention Conventional tracking devices do not accurately follow the jumping up of the plate during bending, as if the follow-up frame were in surface contact with the plate.
There was a problem in that the follow-up frame sometimes delayed or sometimes moved too fast in following the jump of the board.

d Means to solve the problem One end of the swinging mount is pivoted to the mount base, which can tilt freely following the jump of the plate material bent by the press brake, and the other end is attached to the mount base. It is supported on a pedestal base via.

e Effect When the mount base gradually tilts to follow the jump of the plate bent by the press brake,
The component force of the swinging frame's own weight acting on the ammunition machine becomes smaller, and the other end of the swinging frame tends to separate from the mounting base due to the action of the ammunition machine, and comes into contact with and supports the plate material. .

f Embodiment Referring to FIG. 1, a follow-up support device indicated by the general reference numeral 1 follows the jump of a plate-shaped workpiece W when it is bent by a press brake 3, and moves the workpiece W. It has the function of supporting the press brake 3, and is arranged on the front side of the press brake 3.

The press brake 3 is integrally equipped with a fixed apron 9 having an upper mold 7 attached to the upper part of a C-shaped frame 5, and a fixed apron 9 on the lower side of the frame 5 that bends the workpiece W in cooperation with the upper mold 7. A movable apron 13 supporting a lower die 11 for processing is provided so as to be movable up and down. The movable apron 13 is raised and lowered by the operation of a lifting hydraulic cylinder (not shown).
The hydraulic cylinder for lifting and lowering can be controlled by a suitable control device such as a numerical control device or a computer, and can also be controlled by depressing the foot pedal 15.

As is already clear, in the press brake 3 illustrated in this embodiment, the upper die 7 and the lower die 11 are engaged with each other by raising the movable apron 13, and the upper die 7 and the lower die 11 are engaged with each other by raising the movable apron 13. By work piece W
The bending process can be performed.

The movable apron 13 of the press brake 3 is provided with a follow-up support device 1, as will be explained in detail later.
A rise regulating device 17 is installed to restrict the free rise of the elevating pedestal so that the elevating pedestal follows the rise of the movable apron 13. More specifically, a bracket 19 is attached near the center of the movable apron 13 in the longitudinal direction, and a lifting block 21 is attached to the bracket 19.
A screw rod 23 and a guide bar 25, which are screwed together and moved up and down, are supported vertically.

The screw rod 23 is configured to be rotated by a knob 27 rotatably supported on the bracket 19. Further, a regulating plate 29 that projects horizontally in the direction of the follow-up support device 1 is pivotally supported on the lifting block 21 so as to be rotatable only in an upward direction. That is, the regulating plate 29 is connected to the lifting block 21 via a hinge member 31 such as a screw so that it can freely rotate upward from a horizontal state, but cannot rotate downward. Pivotally supported and regulating plate 2
9 is biased to maintain a horizontal position by suitable means such as a weight or a suitable torsion spring.

As is clear from the above structure, the lifting block 2 is moved by rotating the screw rod 23 using the knob 27.
1 and the regulating plate 29 can be adjusted by moving up and down, and the workpiece W positioned on the lower die 11 can be horizontally supported by the follow-up support device 1, as will be described later.

Referring to FIGS. 1 and 2, the follow-up support device 1 includes a movable trolley 35 that is movable on a plurality of horizontally laid rails 33, and a movable trolley 35 whose position is freely adjustable in the front and rear directions with respect to the movable trolley 35. a movable pedestal 37, and an elevating pedestal 39 that can move up and down with respect to the movable pedestal 37.
and a follow-up pedestal 41 which is supported by the elevating pedestal 39 and which follows and supports the workpiece W when it is bent.

More specifically, the movable trolley 35 has the form of, for example, a rectangular frame made of channel material, and a plurality of wheels 43 that are movable on the rails 33 are rotatably mounted on both sides thereof. A suitable rotating body 45 such as a sprocket or a pulley is integrally attached to the axle of the wheel 43 at a suitable position, and this rotating body 45 is connected to a servo motor such as a servo motor via a transmission member 47 such as a chain or a belt. It is operatively connected to a suitable drive device 49. Further, an appropriate drive source unit 51 including, for example, a hydraulic pump is mounted on the movable cart 37 separately from the drive source of the press brake 3.

As is clear from the above configuration, by appropriately driving the drive device 49, the movable cart 35 moves forward and backward along the rails 33 (left and right in FIG. 1), approaching and leaving the press brake 3. I will do it. The closest position of the movable cart 35 to the press brake 3 is regulated by a stopper 53 provided at an appropriate position on the rail 33 or the like.

The drive device 49 is controlled and driven by an appropriate control device such as a numerical control device, and can freely control the moving speed of the moving cart 35. Moreover, the position information of the mobile trolley 35 is
For example, the moving position of the movable cart 35 may be detected using an appropriate detector such as a length measuring device or a pulse encoder, or a plurality of detectors or dogs such as a limit switch or a proximity switch may be installed along the rail 33. It can be obtained by an appropriate configuration such as installing a dog or a detector on the movable cart 35. The position information of the movable trolley 35 can be used, for example, to control the speed of the movable trolley 35 or as a lowering timing signal for the workpiece W when taking the workpiece W out of the press brake 3, as will be described later.

The movable frame 37 has four
It has a rectangular frame structure and is placed inside the movable trolley 35. Guide bars 55 are integrally attached to both sides of the movable platform 37, and each guide bar 55 is movable by a plurality of pairs of support rollers 57 rotatably mounted inside both sides of the movable platform 35. is supported by. A nut member 59 is attached to one end of the movable frame 37, and an adjustment screw 61 extending parallel to the rail 33 and rotatably supported by the movable cart 35 is screwed into the nut member 59. There is.

With the above configuration, the position of the movable pedestal 37 can be adjusted in the front-rear direction with respect to the movable cart 35 by appropriately turning the adjusting screw 61. That is, even if the closest position of the movable cart 35 to the press brake 3 is arbitrary, the distance between the press brake 3 and the movable frame 37 can be adjusted to a desired distance.

Supports 63 such as channel materials are erected on both sides of the edge of the movable mount 37 on the press brake 3 side, and the elevating mount 39 is provided between both supports 63 so as to be able to move up and down. . More specifically, vertical guide posts 65 are integrally attached to the inner surfaces of both columns 63, and the guide posts 65 are sandwiched between a plurality of pairs of support rollers 67 provided on the elevating frame 39. Elevating frame 3
9 is provided so as to be movable up and down.

The elevating frame 39 has a plurality of pairs of the support rollers 67.
A pair of side plates 69 with
An elevating cylinder 73 is interposed between the two.
Therefore, by appropriately controlling the lifting cylinder 73, the lifting platform 39 can be moved up and down as appropriate.

A cylinder control device 7 that controls the lifting cylinder 73 in order to raise the lifting frame 39 in accordance with the lifting of the movable apron 13 of the press brake 3.
5 is provided. More specifically, a control valve 77 for controlling the operation of the lifting cylinder 73 is attached to the beam member 71, as shown in FIG. This control valve 77 supplies pressurized oil from a pressure source such as a hydraulic pump into the lifting cylinder 73 when a slidably provided spool 77S protrudes, and is used for lifting the lifting frame 39 in order to raise it. The cylinder 73 is controlled. Further, the control valve 77 controls the lifting cylinder 73 to stop the lifting and lowering pedestal 39 when the spool 77S is in the neutral position, and also controls the lifting cylinder 73 to stop the lifting and lowering gantry 39 when the spool 77S is pushed in. The elevating cylinder 73 is controlled to descend by its own weight.

Therefore, by appropriately adjusting the position of the spool 77S of the control valve 77 in conjunction with the upward movement of the movable apron 13 in the press brake 3,
Following the rise of the movable apron 13, the elevating frame 39
It is something that can rise.

In order to control the position of the spool 77S of the control valve 77 in accordance with the rise of the movable apron 13, a swinging rod 81 whose base portion abuts against the spool 77S is mounted on a bracket 79 attached to the control valve 77 and swings up and down. It is pivoted for free movement. A mini-cylinder 83 is attached to the tip of the swinging rod 81, and the tip of the piston rod 83P of the mini-cylinder 83 comes into contact with the lower surface of the regulating plate 29 of the rise regulating device 17 and is pressed.

Therefore, when the restriction plate 29 rises in accordance with the rise of the movable apron 13 in the press brake 3, the swinging rod 81 is no longer restricted by the restriction plate 29 and can swing upward. Therefore, the spool 77S of the control valve 77 is projected, and the lifting cylinder 73 is operated. In other words, the lifting cylinder 7
3 is controlled via the lift regulating device 17 of the press brake 3, the swinging rod 81, the control valve 77, etc., and the elevating frame 39 follows the rise of the movable apron 13. Note that when the movable apron 13 suddenly stops rising, the regulating plate 29 is slightly rotated upward against the biasing force toward the horizontal state, absorbing the impact, and then lifting the elevating frame. 39's rise is stopped. Therefore, even if the movable apron 13 is suddenly stopped from rising, it can be stopped with less vibration of the elevating frame 39.

In addition, by bringing the tip of the piston rod 83P of the mini-cylinder 83 into contact with the regulating plate 29 in either the protruding or retracted state, the elevating frame 39 takes two different positions with respect to the movable apron 13. be able to. That is, the following mount 41, which will be described later, can be held in a horizontal state and its vertical position can be changed. For example, when the lower mold 11 is a lower mold that can perform bending and hemming, the workpiece W can be bent. It can be supported horizontally corresponding to the processing height position and the hemming processing height position.

The follower frame 41 supports the workpiece W by following the jump of the workpiece W bent by the press brake 3, and rotates and tilts around the shoulder of the V groove in the lower mold 11. It is supported by the elevating frame 39 via a link mechanism 85 so as to be freely tiltable. The link mechanism 85 is composed of a first link 87, a second link 89, a third link 91, and a fourth link 93, respectively, and the base of the first link 87 is connected to the elevating frame 3.
It is pivotally supported by a side plate 69 of No. 9 via a pivot 95. The base of the second link 89, which is parallel to the first link 87, is pivotally supported by the side plate 69 via a pivot shaft 97. Further, the bases of the third and fourth links 91 and 93, which are parallel to each other, are pivotally connected to the follower frame 41 via pivots 99 and 101, respectively. The tip of the first link 87 and the tip of the fourth link 93 are connected to each other via the pin 103, and
The tip of the link 89 and the tip of the third link 91 are pivotally connected via a pin 105, and the center portions of the first link 87 and the third link 91 are pivotally coupled via the pin 107. It has been done. That is, the link mechanism 85 has a configuration in which two parallel link mechanisms are connected.

A follower cylinder 109 is provided to incline the follower frame 41 supported by the link mechanism 85 having the above-mentioned configuration in accordance with the bending of the workpiece W. More specifically, the following cylinder 109 is swingably supported by a bracket 113 via a hinge pin 111, and the bracket 113 is attached to a beam member 71 of the elevating frame 39. Piston rod 109P of the following cylinder 109
is pivotally connected to the follower frame 41 via a pivot shaft 115.

With the above configuration, when the piston rod 109P of the follower cylinder 109 is extended, the follower frame 41 is rotated and tilted. At this time, by controlling the extension speed of the piston rod 109P to make the rotational speed of the follower frame 41 match the jumping speed of the workpiece W, or according to the inclination angle of the follower frame 41, the press brake 3
By adjusting the state of engagement between the upper die 7 and the lower die 11, the follower frame 41 always supports the workpiece W.

In order to detect the inclination angle of the follower frame 41,
A tilt angle detection device 117 is provided. More specifically, the side plate 69 of the elevating frame 39
A detection cylinder 121 is vertically attached to a support plate 119 that is attached perpendicularly to the piston rod 121P of the detection cylinder 121, and a connecting member 123 is attached horizontally to a piston rod 121P of this detection cylinder 121. This connecting member 12
3 has a rack rod 125 hanging thereon, and the pinion 127 meshed with the rack rod 125 is connected to the support plate 11
Detector 1 like a pulse encoder attached to 9
It is connected to 29. Further, a swinging block (not shown) rotatably supporting a plurality of contact rollers 131 is swingably supported on the connecting member 123.

The contact roller 131 is connected to a flange portion 133F of the detection plate 133 attached to the second link 89.
Detection cylinder 12
1, it is brought into contact with the flange portion 133F. Flange portion 1 of detection plate 133
33F is set parallel to the table surface of the follower frame 41. Furthermore, a limit switch 135 is attached to the support plate 119, which causes the lifting cylinder 73 to move downward when activated by the connecting member 123.

With the above configuration, when the following cylinder 109 is operated to tilt the following mount 41 to follow the workpiece W, the contact roller 131 is moved to the detection plate 133 by the action of the detection cylinder 121.
By lightly contacting the flange portion 133F of the detector 129, the detector 129 is rotated via the rack rod 125 and the pinion 127, and the flange portion 133F is rotated.
The inclination angle of F, in other words, the inclination angle and inclination speed of the follower frame 41 are constantly detected. Therefore, the speed of the movable apron 13 in the press brake 3 can be controlled using the detection signal of the detector 129, and accurate tracking can be performed. In other words, the manner of engagement between the upper die 7 and the lower die 11 in the press brake 3 can be controlled according to the inclination angle or the follow-up speed of the follower frame 41,
It is possible to solve the problem that the follower frame 41 follows the jump of the workpiece W with a large delay.

In order to set the maximum inclination angle of the follower frame 41 as required, an arcuate dog plate 136 centered on the pivot 97 is attached to one of the pair of second links 89 as appropriate. This dog plate 1
A dog 137 is attached to 36 so that its position can be adjusted freely by providing an arcuate slit. On the other hand, a detector 139 such as a limit switch or a proximity switch operated by a dog 137 is mounted on the side plate 69 of the elevating frame 39.
is installed. This detector 139 is connected to the dog 13
7 is detected, the operation of the follower cylinder 109 is stopped, and the tilting of the follower frame 41 is stopped. Therefore, dog 1
37 and the detector 139, the maximum inclination angle of the follower frame 41 can be set.

As is clear from FIGS. 1 and 2, the following mount 41 includes a mount base 139 supported by the link mechanism 85, and a swing mount 141 swingably supported on the mount base 139. Swing frame 14
It is comprised of a sliding pedestal 143, etc., which is slidably supported by 1.

The swing frame 141 has a double plate structure on both sides, and an appropriate number of connecting plates 14 are connected to the double plate structure on both sides.
It has a frame structure connected by 1C. The side of this swing frame 141 that is away from the press brake 3 is pivotally connected to the frame base 139 via a pivot 145, and the press brake 3 side of the swing frame 141 is connected to the frame base 139 via a bullet 147. It is supported so that it can swing freely. More specifically, a storage tube 151 equipped with an adjustment screw 149 is attached to the end of the gantry base 139 on the press brake 3 side, and a bomb 147 such as a spring loaded in this storage tube 151 swings. A fitting pin member 153 attached to the movable frame 141 is supported. Further, the swinging frame 141 is supported by a support block 155 attached to the third link 91 of the link mechanism 85 when the following frame 41 is horizontal.

With the above configuration, when the follower mount 41 is gradually tilted by the operation of the follower cylinder 109 as described above, the weight of the swing mount 141 is transferred to the bomb 147.
Since the component force acting on the press brake 3 side of the swing frame 141 gradually becomes smaller, the press brake 3 side of the swing frame 141 is gradually pushed forward by the ammunition 147. Therefore, for example, when the follower frame 41 is in a tilted state, the lower side of the swing frame 141 is connected to the press brake 3.
Even if the workpiece W is pushed to the side and the workpiece W is supported, and the followability is somewhat poor, the so-called buckling phenomenon of the workpiece W can be prevented.

The sliding frame 143 has both side edges 143 of a flat plate material.
F is bent downward, and a plurality of guide plates 155 provided on the lower surface are provided with elongated holes 1.
55H is formed. A guide roller 157 rotatably supported by the swing frame 141 is fitted into the elongated hole 155H. Further, a sliding drive device 161 for sliding the sliding pedestal 143 is disposed between a bracket 159 provided on the swinging pedestal 143 and the connection plate 141C. Although the sliding drive device 161 is illustrated as a cylinder device in this embodiment, it can also be configured using a screw mechanism, a servo motor, or the like.

As understood from the above configuration, by appropriately operating the sliding drive device 161, the swinging frame 1
41, the sliding frame 143 can be slid as appropriate. Although the details are omitted, the sliding drive device 161 is appropriately controlled in conjunction with the control of the drive device 49 described above.

A divided table 163 divided into a plurality of parts is attached to the sliding pedestal 143 so as to be detachable and position adjustable. That is, each partitioned table 163
A long hole 165H is formed in each of the bracket parts 165 provided on the lower surface of the table, and each divided table 163 is attached to the sliding frame 143 by a fastener 167 such as a bolt passing through the long hole 165. . An appropriate dividing table 163 is provided with a suction device 169 for suctioning the workpiece W. The adsorption device 169 is made of, for example, an electromagnet or a vacuum cup.

In the above configuration, as shown in FIG. 1, the workpiece W is placed across the lower mold 11 when the follower frame 41 is in a horizontal state. After that, when the movable apron 13 of the press brake 3 is raised, the elevating frame 39 is raised following the rise of the movable apron 13, and the workpiece W is held horizontally.

When the upper die 7 and lower die 11 in the press brake 3 start bending the workpiece W, the follow-up cylinder 109 is actuated, and the follow-up frame 4
1 is tilted to follow. Note that the following cylinder 109
The start of operation is caused by pressure changes in the hydraulic mechanism that operates the movable apron 13 in the press brake 3,
This can be controlled by detecting that the workpiece W has moved slightly away from the dividing table 163.

When the workpiece W has been bent at a predetermined angle (state A in FIG. 1), the workpiece W is sucked by the suction device 169 and the lower die 11
is lowered, and the follow-up cylinder 109 is activated again to tilt the follow-up frame 41 even more. Thereafter, the sliding drive device 161 is operated appropriately to lower the sliding frame 143 (state B in FIG. 1), and the drive device 49 is operated appropriately to press the entire follow-up support device 1. brake 3
By separating the workpiece W from the upper mold 7 (state C in FIG. 1), the length L of the rising part of the workpiece W is
Even when the distance H between the press brake 3 and the lower die 11 is larger than the distance H, the workpiece W can be easily and automatically taken out from the press brake 3.

Referring to FIG. 3, a pulse encoder 171 for appropriately detecting the lifting speed or position of the movable apron 13 is connected to a first encoder interface 173, and the signal from the pulse encoder 171 is transmitted to the first encoder interface 173. At the encoder interface 173, the pulse signal is converted into a pulse signal representing the vertical movement speed of the movable apron 13, and is output from the (+) and (-) terminals of the first encoder interface 173. The (+) and (-) terminals of the first encoder interface 173 are connected to the first counter 175, respectively.
are connected to the up terminal and down terminal of the
are individually connected.

On the other hand, the detector 129 is connected to a second encoder interface 181 and the detector 1
The signal from 29 is converted by the second encoder interface 181 into a pulse signal representing the ascending and descending speed of the follower frame 41, and is output from the (+) terminal and the (-) terminal. The (+) terminal of the second encoder interface 181 is connected to the first frequency divider 183, and the (-) terminal is connected to the second frequency divider 185.
The first frequency divider 183 is connected to the second OR
The circuit 179 and the second frequency divider 185
It is connected to an OR circuit 177.

The above first and second frequency dividers 183 and 185 both have the same processing function, and based on the input of condition settings from a control device 187 such as a computer, the vertical speed of the follower frame 41 is adjusted to the movable apron 1.
Correction processing is performed so as to correspond to the ascending/descending speed of No. 3 with a correlation. The first frequency divider 183 outputs a number of pulse signals corresponding to the corrected rising speed of the follower frame 41 to the second OR circuit 179.
From the frequency divider 185, a number of pulse signals corresponding to the corrected descending speed of the follower frame 41 are sent to the first OR circuit 177.
Output to.

The first OR circuit 177 is connected to the second counter 18
The second OR circuit 179 is connected to the down terminal of the D/A converter 19, and the second OR circuit 179 is connected to the up terminal of the second counter 189.
It is connected to 1. This D/A converter 191
is connected to a suitable driver 193, and the driver 193 is connected to an operation control device 1, such as a valve, for controlling the operation of a lifting hydraulic cylinder (not shown) that raises and lowers the movable apron 13.
It is connected to 95.

With the above configuration, when the movable apron 13 and the follower frame 41 are raised, the up terminal and the down terminal of the second counter 189 are provided with a number of pulse signals corresponding to the corrected rising speed of the follower frame 41 and the rising speed of the movable apron 13. A number of pulse signals corresponding to the number of pulse signals are input. In addition, movable apron 13
When the follower frame 41 is lowered, the up terminal and the down terminal of the second counter 189 receive a number of pulse signals corresponding to the lowering speed of the movable apron 13 and a number of pulse signals corresponding to the corrected lowering speed of the follower frame 41, respectively. is input.

Therefore, the second counter 189 outputs a number of pulse signals corresponding to the speed difference between the lifting speed of the movable apron 13 and the corrected lifting speed of the following stand 41 when the moving apron 13 and the following stand 41 are raised and lowered. It will be output. The pulse signal from the second counter 189 is transmitted to the D/A converter 1
The signal is supplied to the driver 193 via 91. The driver 193 controls the operation control device 195 to zero the pulse signal indicating the speed difference from the second counter 189.
The lifting and lowering operation of the movable apron 13 is controlled through the controller. That is, the lifting speed of the movable apron 13 is controlled according to the lifting speed of the follower frame 41.

The first counter 175 is connected to the movable apron 13 from the second encoder interface 173.
The vertical position of the movable apron 13 is detected by inputting a number of pulse signals corresponding to the vertical speed of the movable apron 13 and integrating the pulse signals. The first counter 175 is connected to a comparator 197, and the control device 187 is connected to the comparator 197. That is, the detection value of the vertical position of the movable apron 13 detected by the first counter 175 and the set value of the stop position of the movable apron 13 inputted and set in advance to the control device 187 are determined by the comparator 197.
When the detected value and the set value match, a stop signal for stopping the elevating operation of the movable apron 13 is output to the control device 187 etc., and the elevating operation of the movable apron 13 is stopped.

Referring again to FIG. 3, a suitable setting data input section 199, such as a numeric keypad or a tape reader, is connected to the control device 187, which is composed of a suitable computer, and a display for input data. 201 is connected. Further, a position detection device 203 for detecting the moving position of the movable cart 35 and a command distribution section 205 are connected to the control device 187 as appropriate. The command distribution unit 205 receives a command signal from the control device 187 to control the operation of a first drive control device 207 such as a motor driver that controls the drive device 49, the follow-up cylinder 109, the sliding drive device 161, etc. It functions to distribute to second and third drive control devices 209 and 211 such as appropriate valves.

Therefore, when it is detected that the bending process of the workpiece W has been completed, for example, by a stop signal from the comparator 197 or a signal from an appropriate detector, the following mount 41 is activated by a command from the control device 187. At the same time, the workpiece W is attracted to the workpiece W, and the follow-up cylinder 109 is operated via the second drive control device 209, so that the follow-up pedestal 41 is largely tilted as described above. After that,
The drive device 49 and the sliding drive device 161 are operated as appropriate via the first and third drive control devices 207 and 211 to lower the workpiece W and move the moving carriage 3.
5 movements are performed. Note that the operations of the drive device 49 and the sliding drive device 161 are controlled as appropriate in relation to the detected position of the movable cart 35 by the position detection device 203. As described above, by appropriately controlling the drive device 49 and the sliding drive device 161, the moving cart 35 moves to the position where the workpiece W is taken out forward from between the upper die 7 and the lower die 11 of the press brake. The position detection device 20
3 is detected, the movement of the movable cart 35 is stopped, the follow-up pedestal 41 is lowered to its original horizontal state, and the suction of the workpiece W to the follow-up pedestal 41 is released.

g. Effects of the invention As can be understood from the explanation of the embodiments above, according to the invention, as the inclination of the mount base increases, the component force of the weight of the swinging mount that acts on the ammunition decreases. , the swinging platform is pushed toward the workpiece by the action of the bullet and supports the workpiece. That is, even if there is some error in the following speed of the gantry base with respect to the jump of the workpiece, the error is absorbed and the workpiece is supported, and the so-called buckling phenomenon can also be eliminated.

Note that the present invention is not limited to the above-described embodiments, but can be implemented in other embodiments by making appropriate changes.

[Brief explanation of the drawing]

Figure 1 is a side view of the follow-up support device, and Figure 2 is a side view of the follow-up support device.
FIG. 3 is a cross-sectional view taken along the - line in the figure, and is a block diagram schematically showing the control circuit. 3...Press brake, 35...Moving trolley, 1
39... Frame base, 169... Adsorption device, 14
1... Swinging mount, 147... Ammunition machine.

Claims (1)

[Scope of utility model registration request] A movable cart that can be installed in front of a press brake is provided with a gantry base that can freely tilt to follow the rise of the plate material bent by the press brake, and a swinging pedestal is equipped with a suction device that adsorbs the plate material. 1. A plate tracking device for a press brake, characterized in that one end of the swinging gantry is pivotally connected to the gantry base, and the other end of the swinging gantry is supported by the gantry base via a bullet.