JP2004098105A - Driving device for press brake table - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To generate a thrust in a high speed and low speed movement using one small-capacity servo motor to the extent comparable to a large-capacity servo motor. <P>SOLUTION: On the body of the driving device 19, there is supported a nut/screw part 23 which is screwed on so that a screw shaft member 27 connected to a movable table 3 is vertically moved. A reduction output part 31 for transmitting rotation to the nut/screw part 23 is installed, as are an A-side reduction input part 33 and a B-side reduction input part 35 for transmitting the rotation of a driving rotary body 37 from a motor 43 to the reduction output part. With an A-side first gear 51 provided in the driving rotary body, an adjacent A-side second gear 57 having the same diameter and pitch as the first is installed in the A-side reduction input part. Meantime, in the rotary driving body, a B-side first gear 53 is installed having a different number of teeth from that of the A-side first gear 51, with an adjacent B-side second gear 63 having the same diameter and pitch as the first is installed in the B-side reduction input part. A clutch 69 is provided which makes gear engagement to one side, either an A-side engaging gear 85 to be meshed with the A-side first and second gears 51, 57 or a B-side engaging gear 89 to be meshed with the B-side first and second gears 53, 63. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a table driving device for a press brake.
[0002]
[Prior art]
Conventionally, as a table driving device for a press brake, there are a hydraulic driving method and a ball screw driving method. In the hydraulic drive system, a hydraulic pump as a lift drive source of the movable table is driven by a motor, and pressure oil is sent to two lift cylinders provided at both ends in the front width direction of the body member of the press brake. Since the piston rods of the two elevating cylinders are connected to both ends of an upper table as a movable table, for example, thrust required for bending is generated by feeding pressure oil to the elevating cylinder.
[0003]
The ball screw drive system employs a ball screw as a device for generating thrust, and the nut or screw shaft of the ball screw is driven by a servo motor.
[0004]
[Patent Document 1]
JP 2002-79320 A [Patent Document 2]
JP-A-2-285544
[Problems to be solved by the invention]
By the way, in the hydraulic drive system as a conventional table drive device, it is possible to rationally control high-speed movement at light load and low-speed movement at bending (heavy load), but the performance is maintained for a long time. In order to do so, maintenance of hydraulic fluid is indispensable. Therefore, users who use press brakes need time and expense to replace hydraulic fluid and clean the hydraulic fluid in a certain period of time, and the fluid after replacement is waste oil. But it has a problem.
[0006]
In the conventional ball screw drive system, a ball screw (nut) is rotated from a servo motor as a lifting drive source via a fixed speed reduction device. However, in order to achieve both high-speed movement and low-speed movement (heavy load), it has been necessary to use a considerably large servo motor compared to the hydraulic type in the conventional technology.
[0007]
In addition, there is a method of reducing the capacity of the servo motor as a whole by combining two servo motors for high speed and low speed, but this method has a problem that it becomes a relatively expensive system.
[0008]
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a large-capacity servomotor by a small-capacity servomotor in a ball screw drive system that does not require maintenance such as a hydraulic drive device. An object of the present invention is to provide a table drive device for a press brake that can generate the same thrust at the same high speed and low speed.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, a table driving device for a press brake according to a first aspect of the present invention provides a movable table and a movable table which are folded when a plate material is bent by cooperation of a punch and a die mounted on the fixed table. In the table drive device of the press brake to be driven,
A drive device body fixed to the press brake body member, a nut screw portion supported by the drive device body, a screw shaft member screwed into the nut screw portion and connected to a movable table, and rotation transmitted to the nut screw portion A speed reduction output unit, a drive rotary body that is rotationally driven by a rotational drive means and includes a high speed side large diameter part and a low speed side small diameter part, and the rotation output from the high speed side large diameter part of the drive rotary body is the deceleration output A high-speed-side deceleration input unit that transmits to the part, and a low-speed-side deceleration input unit that transmits rotation from the low-speed side small-diameter part of the drive rotating body to the deceleration output unit,
The high-speed-side large-diameter portion and the high-speed-side deceleration input portion, or the clutch portion that connects either the low-speed-side small-diameter portion and the low-speed-side deceleration input portion.
[0010]
Therefore, the table driving device generates the same thrust at the same high-speed movement and low-speed movement as the large-capacity rotation driving means by one small-capacity rotation driving means in the ball screw driving system. Further, maintenance by the user as found in a conventional hydraulic drive device for a press brake is not required.
[0011]
According to a second aspect of the present invention, there is provided a table driving device for a press brake that drives the movable table when the plate material is bent by the cooperation of a punch and a die mounted on the movable table and the fixed table. In the device
A drive device body fixed to the press brake body member, a nut screw portion supported by the drive device body, a screw shaft member screwed into the nut screw portion and connected to a movable table, and rotation transmitted to the nut screw portion A drive output body that includes a deceleration output unit, a first A gear on the A side, and a first B gear on the B side having a number of teeth different from the number of teeth of the A side first gear, and is driven to rotate by the rotational drive means;
An A-side deceleration input unit that includes an A-side second gear of the same diameter and pitch adjacent to the A-side first gear of the drive rotator and transmits the rotation of the drive rotator to the deceleration output unit;
A B-side deceleration input unit that includes a B-side second gear of the same diameter and pitch adjacent to the B-side first gear of the drive rotator and transmits the rotation of the drive rotator to the deceleration output unit;
A clutch portion that meshes either the A-side meshing gear that meshes with the A-side first gear and the A-side second gear, or the B-side meshing gear that meshes with the B-side first gear and the B-side second gear. It is comprised from these.
[0012]
Therefore, the table driving device generates the same thrust at the same high-speed movement and low-speed movement as the large-capacity rotation driving means by one small-capacity rotation driving means in the ball screw driving system.
[0013]
In addition, maintenance by the user as found in a conventional press brake hydraulic drive device is not required, and the capacity of the rotary drive means can be reduced to about 1/5 compared to the conventional ball screw drive system.
[0014]
According to a third aspect of the present invention, there is provided the press brake table driving device according to the second aspect, wherein the A side first gear and the A side second gear are small-diameter low speed side gears and the B side. The first gear and the B-side second gear are high-speed side gears having a large diameter.
[0015]
Accordingly, the clutch portion operates so that the B-side meshing gear meshes with the B-side first gear and the B-side second gear of the B-side gear train when moving up and down at a high speed, and when moving up and down at a low speed, the A-side meshing. The clutch portion operates so that the gear meshes with the A-side first gear and the A-side second gear of the A-side gear train.
[0016]
According to a fourth aspect of the present invention, there is provided the press brake table driving device according to the second aspect, wherein the A side first gear and the A side second gear are large-speed high-speed side gears, and B The side first gear and the B side second gear are low-speed side gears having a small diameter.
[0017]
Therefore, the clutch portion operates so that the A-side meshing gear meshes with the A-side first gear and the A-side second gear of the A-side gear train when moving up and down at high speed, and the B-side meshing when moving up and down at low speed. The clutch portion operates so that the gear meshes with the B-side first gear and the B-side second gear of the B-side gear train.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0019]
Referring to FIG. 4, a press brake 1 according to this embodiment is mounted, for example, on a ram 3 as a movable table on which a punch P moves up and down via a plurality of upper mold holders 5, and a die D is fixed to a fixed table. For example, it is mounted via a lower mold holder 9 of the lower table 7. A workpiece W such as a plate material to be bent is positioned between the punch P mounted on the ram 3 and the die D mounted on the lower table 7, and the ram 3 descends to cooperate the punch P and the die D. The work W is bent by the action.
[0020]
Further, the table driving device 11 constituting the main part of this embodiment is mounted on, for example, the upper portions of the side frames 15 and 17 constituting the main body frame 13 as the main body member of the press brake 1, and this table driving device. 11, the ram 3 is driven up and down.
[0021]
The ram 3 is guided in the vertical direction along guide portions (not shown) provided on the side frames 15 and 17 via a plurality of guide rollers (not shown).
[0022]
As the press brake 1 of this embodiment, two table driving devices 11 are used as shown in FIG. 4. For example, a housing 19 as a driving device main body of the table driving device 11 includes side frames 15, 17 is fixed to the upper plate. Further, a control device 21 for controlling the operation of the table driving device 11 is provided on the left side in FIG.
[0023]
Referring to FIG. 1, in the table drive device 11, for example, a ball screw nut 23 as a nut screw portion is supported inside a housing 19 via a bearing 25, and for example, a ball screw 27 as a screw shaft member is attached to the ball screw nut 23. The ball screw nut 23 is screwed up and down so as to move up and down by forward and reverse rotation. The lower end of the ball screw 27 in FIG. 1 is connected to the ram 3 by a connecting bolt 29.
[0024]
Further, for example, an output side flange portion 31 as a deceleration output portion that constitutes a part of the reduction gear is coupled to the upper portion of the ball screw nut 23 in FIG.
[0025]
In the center of the upper portion of the output side flange portion 31, for example, an A side input shaft 33 as an A side deceleration input portion constituting a part of the speed reducer is provided so as to transmit rotation to the output side flange portion 31. That is, when the A-side input shaft 33 rotates, the output-side flange portion 31 also rotates following this rotation. However, when the A-side input shaft 33 stops rotating, the output-side flange portion 31 is free. The state, that is, it is free to rotate.
[0026]
Further, on the upper side of the output side flange portion 31, for example, a B side input rotary disk 35 as a B side deceleration input portion that is located on the outer peripheral side of the A side input shaft 33 and constitutes a part of the reduction gear is provided on the output side flange. The part 31 is provided so that rotation can be transmitted. That is, when the B-side input turntable 35 rotates, the output-side flange portion 31 also rotates following this rotation. However, when the B-side input turntable 35 stops rotating, the output-side flange portion 31 It is free, that is, it is free to rotate.
[0027]
Further, for example, a driven timing pulley 37 as a driving rotating body is provided on the outer periphery of the A side input shaft 33 via a bearing 39 above the B side input rotating disk 35. For example, a servo motor 43 as a rotational drive means is attached to the housing 19 via a bracket 41. The rotation of the drive timing pulley 47 provided on the drive shaft 45 of the servo motor 43 is transmitted to the driven timing pulley 37 via the timing belt 49.
[0028]
The driven timing pulley 37 is provided with an A-side first gear 51 of the A-side gear train on the outer periphery of the upper side edge in FIG. 1, and a B-side first gear 53 of the B-side gear train is shown in FIG. 1 is provided on the outer periphery of the lower side edge. In this embodiment, as the A-side first gear 51 of the A-side gear train, for example, a small-diameter low-speed gear as a low-speed small-diameter portion is provided on the outer peripheral surface of the side edge, and B of the B-side gear train is provided. As the side first gear 53, for example, a high-speed high-speed gear as a high-speed side large-diameter portion is attached to the outer periphery of the side edge portion. Accordingly, the A side input shaft 33 functions as a low speed side deceleration input unit, and the B side input rotary disk 35 functions as a high speed side deceleration input unit.
[0029]
Further, a gear flange portion 55 is integrally provided on the upper side of the A side input shaft 33, and the outer peripheral surface of the gear flange portion 55 has the same diameter and the same pitch adjacent to the A side first gear 51. A side second gear 57 is provided as a group of A side gear trains.
[0030]
A fixed shaft member 59 fixed to the main body frame 13 of the press brake 1 is provided above the A-side second gear 57. The lower end of the fixed shaft member 59 in FIG. An A-side third gear 61 having the same diameter and the same pitch adjacent to the second gear 57 is integrally fixed by a bolt BT and provided as a group of A-side gear trains.
[0031]
On the other hand, a B-side second gear 63 having the same diameter and pitch adjacent to the B-side first gear 53 of the driven timing pulley 37 is integrally fixed to the upper part of the B-side input rotating disk 35 with a bolt BT. Are provided as a group of B side gear trains.
[0032]
Further, a gear flange portion 65 is integrally provided with a bolt below the B side second gear 63 so as to protrude above the housing 19, and the outer periphery of the gear flange portion 65 is provided with the B side. A B-side third gear 67 having the same diameter and pitch adjacent to the second gear 63 is provided as a group of B-side gear trains.
[0033]
Further, for example, a clutch cylinder 69 as a clutch portion is slidably provided on the outer periphery of the fixed shaft member 59, and a piston portion 75 that divides the inside of the cylinder into an upper chamber 71 and a lower chamber 73 is a fixed shaft. Projecting integrally on the outer periphery of the member 59. In order to seal the upper chamber 71 and the lower chamber 73, an O-ring 77 is fitted on the outer peripheral surface of the piston portion 75, and an O-ring 79 is also formed on the sliding surface between the clutch cylinder 69 and the fixed shaft member 59. It is inserted.
[0034]
Furthermore, a hollow chamber 83 that is provided with a hole 81 that can pass through the timing belt 49 and that can accommodate the driven timing pulley 37 is provided at the lower portion of the clutch cylinder 69. The A-side meshing gear 85 that meshes with either the A-side first gear 51 and the A-side second gear 57 or the A-side second gear 57 and the A-side third gear 61 of the gear train rotates via the bearing 87. B side meshing provided freely and meshing with either the B side first gear 53 and the B side second gear 63 or the B side second gear 63 and the B side third gear 67 of the B side gear train. A gear 89 is rotatably provided via a bearing 91.
[0035]
More specifically, when the A-side meshing gear 85 meshes with the A-side first gear 51 and the A-side second gear 57 when the clutch cylinder 69 moves up and down, the B-side meshing gear 89 becomes the B-side second gear. When the A side meshing gear 85 meshes with the A side second gear 57 and the A side third gear 61, the B side meshing gear 89 is configured to mesh with the B side third gear 67. The first gear 53 and the B-side second gear 63 are configured to mesh with each other.
[0036]
Although not shown, the housing 19 and the clutch cylinder 69 are provided with a linearly movable guide that can move in the vertical direction on the circumference, and the clutch cylinder 69 can be accurately moved up and down by being guided by the guide. It is configured as follows.
[0037]
With the above configuration, referring also to FIG. 3, when the workpiece W is positioned between the punch P and the die D and then the pressure oil is supplied to the upper chamber 71 of the clutch cylinder 69, it is shown in FIG. 1. Thus, the A-side meshing gear 85 and the B-side meshing gear 89 are raised, and the A-side meshing gear 85 meshes with the A-side second gear 57 and the A-side third gear 61. The B-side meshing gear 89 meshes with the B-side first gear 53 and the B-side second gear 63.
[0038]
Thereafter, when the servo motor 43 rotates forward, the rotation of the servo motor 43 is transmitted to the driven timing pulley 37 via the drive timing pulley 47 and the timing belt 49 of the drive shaft 45 and rotated. At this time, the A-side first gear 51 of the driven timing pulley 37 is disengaged from the A-side meshing gear 85, and the A-side third gear 61 is fixed to the main body frame 13 of the press brake 1. Therefore, the A-side input shaft 33 integral with the A-side second gear 57 does not rotate.
[0039]
On the other hand, the B-side first gear 53 of the driven timing pulley 37 meshes with the B-side meshing gear 89, and the B-side meshing gear 89 meshes with the B-side second gear 63. The B-side input turntable 35 that is integral with the rotation rotates. Therefore, the rotation of the B-side input turntable 35 is transmitted to the output-side flange portion 31, and the ball screw nut 23 rotates forward via the output-side flange portion 31. At this time, the B-side second gear 63 is a large-diameter and high-speed side gear, and the reduction ratio with the ball screw nut 23 is (n + 1) / n, so that the output-side flange portion 31 rotates at a high speed with an increasing tendency.
[0040]
That is, since the rotation of the drive timing pulley 47 of the servo motor 43 rotates at a high speed at a ratio of approximately 1: 1 with respect to the rotation decelerated by the timing belt 49 and the driven timing pulley 37, The ball screw 27 is moved down at a high speed, and the ram 3 is moved down at a high speed.
[0041]
When the ram 3 is lowered to a predetermined position, the rotation of the servo motor 43 is stopped. Thereafter, the pressure oil is supplied to the lower chamber 73 of the clutch cylinder 69 so that the clutch cylinder 69 is lowered as shown in FIG. 2, so that the A side meshing gear 85 and the B side meshing gear 89 are The A side meshing gear 85 meshes with the A side first gear 51 and the A side second gear 57, and the B side meshing gear 89 meshes with the B side second gear 63 and the B side third gear 67. Become.
[0042]
Thereafter, when the servo motor 43 rotates in the reverse direction, the rotation of the servo motor 43 is transmitted to the driven timing pulley 37 via the drive timing pulley 47 and the timing belt 49 of the drive shaft 45 to rotate. At this time, the B-side first gear 53 of the driven timing pulley 37 is disengaged from the B-side meshing gear 89 and the B-side meshing gear 89 meshes with the B-side third gear 67 fixed to the housing 19. The B-side input rotary disk 35 integral with the B-side second gear 63 does not rotate.
[0043]
On the other hand, the A side first gear 51 of the driven timing pulley 37 meshes with the A side meshing gear 85, and the A side meshing gear 85 meshes with the A side second gear 57. As a result, the A-side input shaft 33 is rotated. Therefore, the rotation of the A-side input shaft 33 is transmitted to the output-side flange portion 31, and the ball screw nut 23 rotates forward via the output-side flange portion 31. At this time, the A-side second gear 57 is a small-diameter and low-speed gear, and the reduction ratio with the ball screw nut 23 is 1 / n, so that the output-side flange 31 rotates at a low speed.
[0044]
That is, since the rotation of the drive timing pulley 47 of the servo motor 43 is normally rotated at a low speed at a ratio of approximately n: 1 with respect to the rotation decelerated by the timing belt 49 and the driven timing pulley 37, The ball screw 27 is moved downward at a low speed, and the ram 3 is lowered at a low bending speed. The workpiece W is bent at a low speed with a large force by the punch P and the die D.
[0045]
After the workpiece W is bent at a desired angle, the reverse rotation of the servo motor 43 is stopped, and then the servo motor 43 is rotated forward, whereby the output side flange portion 31 is reverse rotated at a low speed, and the ball screw nut 23 Is reversely rotated at a low speed, the ball screw 27 is moved up at a low speed, and the ram 3 is moved up at a low speed.
[0046]
After the ram 3 is raised to a predetermined position, the rotation of the servo motor 43 is stopped. Thereafter, when pressure oil is supplied to the upper chamber 71 of the clutch cylinder 69, the clutch cylinder 69 rises as shown in FIG. 1, so that the A side meshing gear 85 and the B side meshing are the same as described above. Gear 89 is raised, A-side meshing gear 85 is meshed with A-side second gear 57 and A-side third gear 61, and B-side meshing gear 89 is coupled with B-side first gear 53 and B-side second gear 63. Will be engaged.
[0047]
Thereafter, when the servo motor 43 rotates in the reverse direction, the rotation of the servo motor 43 is transmitted to the driven timing pulley 37 via the drive timing pulley 47 and the timing belt 49 of the drive shaft 45 to rotate. As described above, the B-side first gear 53 of the driven timing pulley 37 is rotated by the B-side input rotary disk 35 integrated with the B-side second gear 63 via the B-side meshing gear 89. The rotation of the input turntable 35 causes the output side flange 31 to rotate forward at high speed, and the ball screw nut 23 rotates forward at high speed. Therefore, the ball screw 27 is moved up and moved at high speed, and the ram 3 is moved up at high speed. Become. After the ram 3 has moved to the predetermined rising end, the rotation of the servo motor 43 is stopped, and one bending process is completed.
[0048]
From the above, it has been possible to provide the table driving device 11 that generates the same thrust at the same high speed and low speed as the large capacity servo motor 43 by one small capacity servo motor 43 in the ball screw drive system. .
[0049]
In addition, maintenance by the user as found in the hydraulic drive device of the conventional press brake 1 is unnecessary, and the capacity of the servo motor 43 can be reduced to about 1/5 compared with the conventional ball screw drive system.
[0050]
In addition, this invention is not limited to embodiment mentioned above, It can implement in another aspect by making an appropriate change. In this embodiment, the lowering press brake 1 is used as the press brake 1, but the raising press brake 1 may be used.
[0051]
In the above-described embodiment, the A-side first gear 51, the A-side second gear 57, and the A-side third gear 61 of the A-side gear train are small-diameter low-speed gears, and the low-speed-side small-diameter portion or the low-speed-side reduction gear. The B-side first gear 53, the B-side second gear 63, and the B-side third gear 67 of the B-side gear train are large-diameter high-speed gears, and the high-speed small-diameter portion and the high-speed deceleration input portion. The gears 51, 57, and 61 of the A side gear train are large-diameter high-speed side gears that function as a high-speed side small-diameter portion and a high-speed-side reduction input portion. The gears 53, 63, and 67 in the row may be configured to function as a low-speed side small-diameter portion or a low-speed-side deceleration input portion with a small-diameter low-speed side gear.
[0052]
In this case, when moving up and down at high speed, the clutch portion 69 operates so that the A side meshing gear 85 meshes with the A side first gear 51 and the A side second gear 57 of the A side gear train, and when moving up and down at low speed. The clutch portion 69 operates so that the B-side meshing gear 89 meshes with the B-side first gear 53 and the B-side second gear 63 of the B-side gear train.
[0053]
【The invention's effect】
As can be understood from the description of the embodiments of the invention as described above, according to the invention of claim 1, in the ball screw drive system, one small-capacity rotary drive means has the same high-speed movement as a large-capacity rotary drive means. It is possible to provide a table drive device that can move at a low speed and generate an equivalent thrust. In addition, it is possible to eliminate the need for maintenance by the user as found in a conventional hydraulic drive device for a press brake.
[0054]
According to the second aspect of the present invention, there is provided a table driving device that generates the same thrust at the same high-speed movement and low-speed movement as a large-capacity rotary drive means by one small-capacity rotary drive means in a ball screw drive system. Can do.
[0055]
In addition, maintenance by the user as found in a conventional press brake hydraulic drive device is not required, and the capacity of the rotary drive means can be reduced to about 1/5 compared to the conventional ball screw drive system.
[0056]
According to the invention of claim 3, by operating the clutch portion so that the B-side meshing gear meshes with the B-side first gear and the B-side second gear of the B-side gear train, it can be moved up and down at high speed. By moving the clutch portion so that the A-side meshing gear meshes with the A-side first gear and the A-side second gear of the A-side gear train, it can be moved up and down at a low speed.
[0057]
According to the invention of claim 4, it is possible to move up and down at high speed by operating the clutch portion so that the A side meshing gear meshes with the A side first gear and the A side second gear of the A side gear train. By operating the clutch portion so that the B-side meshing gear meshes with the B-side first gear and the B-side second gear of the B-side gear train, it is possible to move up and down at a low speed.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a table driving device according to an embodiment of the present invention.
FIG. 2 is an operation explanatory diagram of a table driving device.
FIG. 3 is a chart showing the operation of each member of the table driving device.
FIG. 4 is a front view of a press brake according to the embodiment of the present invention.
[Explanation of symbols]
1 Press brake 3 Ram (movable table)
7 Lower frame (fixed frame)
11 Table driving device 13 Main body frame (main body member of press brake 1)
19 Housing (Driver body)
23 Ball screw nut (nut screw part)
27 Ball screw (screw shaft member)
31 Output flange (deceleration output)
33 A side input shaft (A side deceleration input part)
35 B side input turntable (B side deceleration input part)
37 Driven timing pulley (drive rotor)
43 Servo motor (rotation drive means)
47 Drive timing pulley 49 Timing belt 51 A side first gear 53 B side first gear 57 A side second gear 59 Fixed shaft member 61 A side third gear 63 B side second gear 67 B side third gear 69 Clutch cylinder (Clutch part)
85 A side meshing gear 89 B side meshing gear

Claims (4)

In the table driving device of the press brake that drives the movable table when bending the plate material by the cooperation of the punch and die mounted on the movable table and the fixed table,
A drive device body fixed to the press brake body member, a nut screw portion supported by the drive device body, a screw shaft member screwed into the nut screw portion and connected to a movable table, and rotation transmitted to the nut screw portion A deceleration output unit to
A drive rotator that is rotationally driven by a rotational drive means and includes a high-speed-side large-diameter portion and a low-speed-side small-diameter portion, and a high-speed side that transmits rotation from the high-speed-side large-diameter portion of the drive rotator to the deceleration output portion A deceleration input unit, and a low-speed deceleration input unit that transmits rotation from the low-speed small-diameter portion of the drive rotor to the deceleration output unit;
A press brake table comprising: the high speed side large diameter portion and the high speed side deceleration input portion; or the clutch portion connecting either the low speed side small diameter portion and the low speed side deceleration input portion. Drive device. In the table driving device of the press brake that drives the movable table when bending the plate material by the cooperation of the punch and die mounted on the movable table and the fixed table,
A drive device body fixed to the press brake body member, a nut screw portion supported by the drive device body, a screw shaft member screwed into the nut screw portion and connected to a movable table, and rotation transmitted to the nut screw portion A deceleration output unit to
A drive rotating body including an A-side first gear and a B-side first gear having a number of teeth different from the number of teeth of the A-side first gear;
An A-side deceleration input unit that includes an A-side second gear of the same diameter and pitch adjacent to the A-side first gear of the drive rotator and transmits the rotation of the drive rotator to the deceleration output unit;
A B-side deceleration input unit that includes a B-side second gear of the same diameter and pitch adjacent to the B-side first gear of the drive rotator and transmits the rotation of the drive rotator to the deceleration output unit;
A clutch portion that meshes either the A-side meshing gear that meshes with the A-side first gear and the A-side second gear, or the B-side meshing gear that meshes with the B-side first gear and the B-side second gear. And a table drive device for a press brake. 3. The A-side first gear and the A-side second gear are small-diameter low-speed side gears, and the B-side first gear and B-side second gear are large-diameter high-speed side gears. Press brake table drive device. 3. The A-side first gear and the A-side second gear are large-diameter high-speed side gears, and the B-side first gear and B-side second gear are small-diameter low-speed side gears. Press brake table drive device.

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