JP4672284B2 - Electric press device - Google Patents

Description

  The present invention includes an electric press device, particularly, a plurality of drive motors, and a plurality of screw shafts provided corresponding to the drive motors, and a slider is reciprocated (vertically moved) to be attached to the slider. When reciprocating the slider of the electric press device that presses the upper die and the lower die attached to the bed, each screw shaft is composed of a plurality of screw shafts, and the screw engaging portion of the screw shaft The present invention relates to an electric press device that distributes the load applied to the machine.

  As an electric press device that presses by reciprocating a slider using a screw shaft with a motor as a drive source, description will be given using Japanese Patent Application No. 2003-160656 filed on June 5, 2003, which has not been disclosed yet. I will do it.

FIG. 5 is a schematic explanatory view of an electric press apparatus using a plurality of screw shafts.

In FIG. 5 , two sliders 5, 6 are provided inside a frame 4 formed by a bed 1, a crown 2, and a plurality of columns 3, and the columns 3 are engaged with the columns 3 at the four corners of each slider 5, 6. In the axial direction of the support column 3, sliding holes are provided for allowing the sliders 5 and 6 to slide freely.

  A plurality of, for example, four mounting bases 8 are provided on the upper surface of the crown 2, and an AC servo motor 9 incorporating an encoder is attached to each mounting base 8.

  Since the components and components related to the AC servo motors 9 mounted on the four mounting bases 8 described below are exactly the same, only one of them will be described.

  The fast-feed screw shaft 10 fixed to the shaft of the AC servo motor 9 in the mounting base 8 is rotatably supported by the crown 2 and is fixed to the slider 6 so that it is screwed to the screw feed nut 11. The slider 5 further provided below the slider 6 can be protruded. Therefore, the slider 6 is raised or lowered by the forward / reverse rotation of the four AC servo motors 9 synchronized, and the slider 6 can be reciprocated by the rotation control of the AC servo motor 9.

  The slider 6 is provided with a lock mechanism 14 for clamping the screw shaft 10 to the slider 6, that is, fixing the screw shaft 10. When the lock mechanism 14 is activated, the screw shaft 10 is fixed to the slider 6, the screw shaft 10 and the slider 6 are integrated, and the screw shaft 10 and the slider 6 cannot move relative to each other.

  A plurality of, for example, 2, 3 or 4 mounting bases 15 are provided on the upper surface of the slider 6, and an AC servo motor 17 with a speed reducer 16 incorporating an encoder is attached to each mounting base 15. ing. Since the components and components related to each AC servomotor 17 mounted on the mounting base 15 are exactly the same, one of them will be described in the following description.

  A screw shaft 18 having a ball screw portion fixed to the shaft of the AC servomotor 17 inside the mounting base 15 is screwed into a ball screw mechanism 19 with an operating mechanism in which a ball and a nut member are provided, and a slider. 6 is rotatably supported on the shaft. Two sliders 6 and the slider 5 are connected by the ball screw shaft 18 and the ball screw mechanism 19 with an operating mechanism fixed to the upper surface of the slider 5. That is, when the plurality of AC servo motors 17 provided on the mounting base 15 are rotated in the normal or reverse direction synchronously, the slider 5 is raised or lowered, and the slider 5 is reciprocated by controlling the rotation of the AC servo motor 17. Can be made.

  An upper mold 7 is attached to the lower end surface of the slider 5, and a lower mold 20 is provided on the bed 1 at a position corresponding to the upper mold 7. A pulse scale (position detector) 21 for detecting the position of the slider 5 is attached along the four support columns 3 between the bed 1 and the crown 2 and placed on the upper mold 7 and the lower mold 20. While detecting the contact position with the workpiece 22, the position of the upper mold 7 is detected by detecting the position of the slider 5 such as the upper limit standby position and the lower limit lowering position of the upper mold 7. Parallel control of the slider 5 and the like is performed with a saddle or the like not shown with the four pulse scales 21 as a reference.

  A lock mechanism 14 that controls the rotation of each of a plurality (four) of AC servomotors 9 and two to four AC servomotors 17 and fixes or releases the screw shaft 10 to the slider 6. The control device 23 to be controlled receives various setting values in advance, and also detects the pulse scale 21 for detecting the position of the slider 5, that is, for detecting the position of the upper die 7. Based on the position signal, the slider 6 that is lowered by the AC servomotor 9 until the time when the upper die 7 in the upper limit standby position contacts with the workpiece 22 placed on the lower die 20 or immediately before the contact. When the upper die 7 is rapidly lowered through the AC servo motor 9 and the locking mechanism 14 is immediately locked after the AC servo motor 9 is stopped, the upper die 7 comes into contact with the workpiece 22 or immediately before the contact. From the time when the upper die 7 is lowered to a predetermined lower limit lowering position (imaginary line position (7) of the upper die 7 in FIG. 7), the slider 5 for lowering the upper die 7 by the AC servo motor 17 is moved. Then, the speed is reduced with respect to the rapid descending speed, the AC servo motor 17 is set in the torque addition mode, the upper die 7 presses the workpiece 22 placed on the lower die 20, and the workpiece 22 is After the upper mold 7 reaches the lower limit lowering position, the lock mechanism 14 is unlocked and the slider 5 by the AC servo motor 17 and the slider 6 by the AC servo motor 9 are controlled so as to perform press processing into a predetermined shape. The upper die 7 is controlled to rise rapidly through

  The locking mechanism 14 is locked after the AC servo motor 9 is stopped to fix the screw shaft 10 to the slider 6 because the reaction force generated when the upper die 7 presses the workpiece 22 placed on the lower die 20. Therefore, even if a force is applied to move the slider 6 upward via the slider 5, the ball screw mechanism 19 with the differential mechanism, the ball screw shaft 18, and the like, the screw shaft 10 and the slider 6 described above are integrated. This is because the rotation of the screw shaft 10 is prevented, and the slider 6 does not move upward and maintains the stop position. That is, the upper die 7 can apply a predetermined press load to the workpiece 22.

6 shows an enlarged illustration of the moving mechanism portion of the upper mold used in the FIG. 5, the same as those in FIG. 5 are denoted by the same reference numerals.

In FIG. 6 , the output shaft 25 of the AC servo motor 9 that passes through the mounting base 8 attached to the upper surface of the crown 2 is connected to the tip of the screw shaft 10 via a coupling 26. In the hole 27 provided in the crown 2, a bearing 29 fitted to the screw shaft 10 is attached via a bearing holder 28, and the screw shaft 10 driven by the AC servo motor 9 is rotatably attached to the crown 2. ing.

  Further, the output shaft 30 through the speed reducer 16 of the AC servo motor 17 passing through the mounting base 15 attached to the upper surface of the slider 6 is connected to the tip of the ball screw shaft 18 through the coupling 31. . In the hole 32 provided in the slider 6, a bearing 34 fitted to the ball screw shaft 18 is attached via a bearing holder 33, and the ball screw shaft 18 driven by the AC servomotor 17 is rotatably attached to the slider 6. It is attached.

The lock mechanism 14 attached to the slider 6 includes a thrust load bearing 35, a lock nut 36, a clamp piece 37, and a lock nut loosening mechanism 38. The screw shaft 10 is fixed with the double nut of the feed nut 11 and the lock nut 36 (the rotation of the screw shaft 10 with respect to the lock nut 36 is stopped) or the screw shaft 10 is released (the rotation of the screw shaft 10 with respect to the lock nut 36 is free). It is like that. The screw shaft 10 is fixed / released with a double nut of the female screw feed nut 11 and the lock nut 36 by a lock that slightly rotates the lock nut 36 forward / reversely via a clamp piece 37 fixed to the lock nut 36. The nut relaxation mechanism 38 is used.
Japanese Patent Application No. 2003-160656

  An electric press device that reciprocates a slider using a plurality of screw shafts provided corresponding to the drive motor as described above, and presses the upper die attached to the slider and the lower die attached to the bed. However, the larger the press work, the greater the load applied to the screw engaging part of each screw shaft that is directly involved in the press work, and the screw engaging part of the screw shaft has a limit of the pressure load. Even if you increase the number of screws, even if you try to reciprocate the slider uniformly at that time, for example, it is difficult to control the reciprocating motion of the slider because the control of neighboring screw shafts interferes with each other Occurs.

  The present invention has been made in view of the above points, and in reciprocating a slider attached with an upper die that is directly involved in press working, a plurality of screw shafts driven by each motor are grouped. For the purpose of providing an electric press device that is configured by a plurality of screw shafts, and that distributes the load applied to the screw engaging portion of the screw shaft, and that the slider to which the upper die is attached can smoothly reciprocate. Yes.

For this purpose, the electric press device of the present invention includes a frame formed of a bed, a crown, and a plurality of support columns, a slider having an upper mold attached to the lower end surface, and freely sliding on the support columns, and a ball screw portion. A ball provided on the slider, which includes a screw shaft rotatably supported by the crown, and a ball screw nut that engages with a ball screw portion provided on the screw shaft, and moves the slider up and down by rotation of the screw shaft A screw mechanism, a motor for rotating the screw shaft, a lower mold installed corresponding to the bed at a position corresponding to the upper mold, a position detector for detecting the position of the upper mold, and a position detected by the position detector On the basis of the signal, in the electric press device provided with a control device that moves the slider up and down by the rotation of the screw shaft and presses the work piece placed on the lower die,
At least four mounting bases are provided on the top surface of the crown,
For each of the mounting bases, a plurality of screw shafts are provided in association with each other, and the ball screw mechanism is provided corresponding to each of the screw shafts,
The motor for rotating the screw shaft includes one motor, and a gear is provided between the output shaft of the motor and each screw shaft forming the group, and the rotational torque of the output shaft of the motor is It is configured to be transmitted to each of a plurality of screw shafts corresponding to each mounting base,
One of the motors provided corresponding to each of the mounting bases drives the plurality of screw shafts provided for the individual mounting bases together to rotate the corresponding ball screw. It is characterized by moving the slider up and down via a mechanism.

The electric press device of the present invention includes a frame formed of a bed, a crown, and a plurality of columns, a slider having an upper mold attached to the lower end surface, and freely sliding on the columns, and a ball screw unit. A ball provided on the slider, which includes a screw shaft rotatably supported by the crown, and a ball screw nut that engages with a ball screw portion provided on the screw shaft, and moves the slider up and down by rotation of the screw shaft A screw mechanism, a motor for rotating the screw shaft, a lower mold installed corresponding to the bed at a position corresponding to the upper mold, a position detector for detecting the position of the upper mold, and a position detected by the position detector On the basis of the signal, in the electric press device provided with a control device that moves the slider up and down by the rotation of the screw shaft and presses the work piece placed on the lower die,
At least four mounting bases are provided on the top surface of the crown,
For each of the mounting bases, a plurality of screw shafts are provided in association with each other, and the ball screw mechanism is provided corresponding to each of the screw shafts,
The motor for rotating the screw shaft is composed of a plurality of main and sub motors, respectively, and includes a drive shaft configured to obtain a combined torque by the cooperative operation of the plurality of motors. A gear is provided between each of the screw shafts corresponding to the mounting base of the motor, and a combined rotational torque of the output shafts of the plurality of motors is transmitted to each of the plurality of screw shafts forming the group. Composed of
A plurality of the motors provided corresponding to the respective mounting bases rotate together the plurality of screw shafts provided for the individual mounting bases, and the corresponding ball screws. Move the slider up and down through the mechanism
It is characterized by that.

  A servo motor is used as the motor, and the servo motor is numerically controlled by a signal from a control device.

  Since each of the plurality of screw shafts provided corresponding to the drive motor is replaced with a single screw shaft, and a plurality of screw shafts forming a group are used, it is applied to the screw engaging portion of each screw shaft. The load burden becomes smaller.

  Since each of the plurality of screw shafts is replaced with a single screw shaft and configured with a plurality of screw shafts that form a group, the occurrence of press inoperability is avoided and the thread engaging portion of each screw shaft is engaged. The load is dispersed and reduced, the processing accuracy and durability of the press device are ensured, and the size can be further increased.

  When a motor configuration using a plurality of mains and subordinates is used, the motor can be miniaturized and the inertia of the motor can be reduced, so that the electric press device can be controlled quickly. Become.

  FIG. 1 is a front view of an embodiment in which a part of a main part of a press apparatus according to the present invention is shown in cross section.

  In FIG. 1, a rectangular slider 105 is provided inside a frame body 104 formed by a bed 101, a crown 102, and a plurality of columns 103. Each of the sliders 105 has a support 103 inserted in sliding holes provided at four corners thereof, and is configured to slide freely in the axial direction of the support 103.

  A plurality of, for example, four mounting bases 108 (two mounting bases 108 are shown in FIG. 1) are provided on the top surface of the crown 102, and each mounting base 108 has an AC with a built-in encoder. A servo motor 109 is attached.

  Since the components and components related to each AC servo motor 109 mounted on the four mounting bases 108 described below are exactly the same, only one of them will be described.

  Inside the mounting base 108, a gear 115 is fixed to an output shaft 110 of an AC servo motor 109 that penetrates the mounting base 108, and a plurality of gears 115 forming a group by the mounting base 108 of interest. In the example shown in FIG. 1, two gears 116a and 116b are engaged with each other. The two gears 116a and 116b forming this group are respectively attached to the tips of screw shafts 118a and 118b having ball screw portions 120a and 120b. The screw shafts 118a and 118b are thrust bearings 121a, 122a, 121b, Each is pivotally supported by the crown 102 via 122b.

  One ball screw mechanism 119 with a differential mechanism is fixed to the slider 105. The ball screw mechanism 119 with a differential mechanism includes ball screw nuts 123a and 123b containing balls corresponding to two screw shafts 118a and 118b forming a group, and lower ends of these ball screw nuts 123a and 123b. It has a structure in which one differential mechanism 124 is attached.

  Ball screw portions 120a and 120b at the lower end portions of the screw shafts 118a and 118b are respectively screwed into corresponding ball screw nuts 123a and 123b. That is, with respect to one AC servo motor 109 and a ball screw mechanism 119 with a differential mechanism, a structure is adopted in which the slider 105 is raised or lowered by two screw shafts 118a and 118b forming a group.

  Accordingly, the slider 105 is raised or lowered by the forward / reverse rotation of the four AC servo motors 109 synchronized with each other, and the slider 105 can be reciprocated in the vertical direction by the rotation control of the AC servo motor 109.

  Here, the differential mechanism 124 will be briefly described. In the ball screw that is engaged by a line contact or a point contact between the ball constituting the ball screw and the ball groove, the differential mechanism 124 is always in the same position when loaded. It was made possible to avoid local wear of the ball and its ball groove resulting from engaging by line contact or point contact, and was disclosed as Japanese Patent Application Laid-Open No. 2002-144098 by the present applicant. Etc. are known.

  An upper die 107 is attached to the lower end surface of the slider 105, and a lower die 125 is provided on the bed 101 at a position corresponding to the upper die 107. A pulse scale 126 for detecting the position of the slider 105, that is, the position of the upper mold 107, is attached between the bed 101 and the crown 102 along the four columns 103, and a detection unit 127 for reading each pulse scale 126. Are provided at the positions of the corresponding sliders 105.

  The press working process is performed based on the detection signals of the position detectors of the pulse scales 126 provided on the four columns 103 and the detectors 127. The parallel control of the slider 105 or the like is performed by using the four pulse scales 126 described above. The control is performed automatically by a control signal from a control device (not shown) as a reference, or by a saddle (not shown).

  As described above, the AC servomotor 109 is used as a drive source, and the two screw shafts 118a and 118b forming the group are fixed to the slider 105 via one common differential mechanism 124. Two ball screw mechanisms 119 with a differential mechanism are configured to move the slider 105 in the vertical direction.

  Therefore, in such a configuration, in the case of a structure in which only eight screw shafts are provided on the slider 105 and driven by a corresponding AC servo motor, the mutual interference of neighboring screw shafts causes the inconsistency of each operation. There is no possibility that the slider 105 cannot be controlled.

  The screw shaft forming a group driven by one AC servo motor has been described as being configured to be attached to one ball screw mechanism 119 with a differential mechanism by two screw shafts 118a and 118b. If three screw shafts are used, the load applied to the screw engaging portion of each screw shaft is reduced, the processing accuracy and durability of the press device are further ensured, and the size can be further increased.

  In FIG. 1, a plurality of ball screw mechanisms are provided to move the slider 105 up and down. However, if necessary, only one ball screw mechanism may be used to move the slider 105 up and down.

  FIG. 2 shows an embodiment schematic control circuit for one group of servo motors of the electric press apparatus having the structure shown in FIG.

  In FIG. 2, an NC apparatus 150 for controlling the entire electric press apparatus includes a computer, and an AC servo motor is used to input data signals that have been input in advance and data processed according to newly input data information. 109 is sent to the servo module 151 in charge. The position signals detected from the position detectors of the pulse scale 126 and the detection unit 127 are also sent to the servo module 151 every moment, whereupon data processing is appropriately performed as movement commands, and the control information is transmitted to the servo driver 152. Send. The servo driver 152 supplies the AC servomotor 109 with a drive signal that also takes into account the signal from the encoder 109 </ b> A built in the AC servomotor 109. As a result, the output shaft 110 of the AC servo motor 109 rotates in a rotation direction suitable at that time, and the two screw shafts 118a forming the above group via the two gears 116a and 116b engaged with the gear 115 of the output shaft 110. , 118b, the slider 105 is moved in a predetermined direction.

  FIG. 3 shows a front view of another embodiment in which a part of the main part of the pressing apparatus according to the present invention is shown in cross section.

  3, the same components as those in FIG. 1 are denoted by the same reference numerals. A mounting base 128 is further provided on the top surface of each of the four mounting bases 108 (two mounting bases 108 are shown in FIG. 3) provided on the top surface of the crown 102. An AC servo motor 129a having an encoder built therein and an AC servo motor 129b having a sub encoder subordinate to the main are attached.

  As in the case of FIG. 1, the components and components related to the AC servomotors 129a and 129b mounted on the four mounting tables 128 are exactly the same, and one of them will be described.

  Inside the mounting base 128, gears 131a and 131b are fixed to the output shafts 130a and 130b of the two AC servo motors 129a and 129b penetrating the mounting base 128, respectively, and in common with the two gears 131a and 131b. Gears 133 fixed to the meshing shafts 132 are rotatably supported on the mounting base 108 via thrust bearings 134, respectively. A gear 115 shown in FIG. 1 is fixed to the other end of the shaft 132 protruding toward the mounting base 108. The gear 115 is engaged with two gears 116a and 116b similar to those described in FIG. The screw shafts 118a and 118b in which the ball screw portions 120a and 120b are formed are rotated. The following description is the same configuration and operation as in FIG. 1 and will not be described. However, the rotational torque of the main AC servo motor 129a and the rotational torque of the sub AC servo motor 129b subordinate to the main are described. Are combined via the gear 133, and the combined rotational torque is transmitted to the shaft 132.

  Therefore, when the slider 105 is reciprocated up and down during press working, the motor can be reduced in size, and the inertia of the motor is reduced, so that there is an advantage that agile operation control is possible.

  FIG. 4 shows an embodiment schematic control circuit for one group of servo motors of the electric press apparatus having the structure shown in FIG.

  In FIG. 4, an NC apparatus 150 for controlling the entire electric press apparatus includes a computer, and an AC servo motor is used to input data signals that have been input in advance, and data signals that have been arithmetically processed according to newly input data information. 129a and 129b are sent to the servo module 151 in charge. The position signals detected from the position detectors of the pulse scale 126 and the detection unit 127 are also sent to the servo module 151 every moment, whereupon data processing is appropriately performed as movement commands, and the control information is transmitted to the servo driver 152. Send. The servo driver 152 supplies the AC servomotor 129a with a drive signal that also considers the signal from the encoder 129A built in the AC servomotor 129a, and also applies a corresponding load to the sub-AC servomotor 129b in a cooperative relationship. Is sent to the servo driver 153. The servo driver 153 supplies the AC servomotor 129b with a drive signal that also considers the signal from the encoder 129B built in the AC servomotor 129b.

  As a result, the output shaft 130a of the main AC servo motor 129a and the output shaft 130b of the sub AC servo motor 129b rotate in the rotation direction suitable at that time. After securing, the slider 105 is moved in a predetermined direction by the rotation of the two screw shafts 118a and 118b forming the group via the two gears 116a and 116 meshing with the gear 115 fixed to the shaft 132.

  In the above description, an AC servo motor is used as a drive source for moving the slider 105. However, other motors such as a DC servo motor can be used, and the slider 105 is controlled using another motor such as a stepping motor. It may be configured. Further, although the pulse scale 126 and its detection unit 127 are used as the position detector of the slider 105, other electrical / mechanical position detectors can be used.

And Figure 5, in the electric press apparatus having a rapid traverse mechanism shown in FIG. 6, when applying electric press device of the present invention, for example of the present invention the slider 6,5 in FIG. 5, FIG. 1 5 , the screw shaft 18 shown in FIG . 5 has a structure including two ball screw shafts 18a and 18b as shown in FIG. 7 , and the present invention shown in FIG. What is necessary is just to comprise.

FIG. 1 is a front view of an embodiment in which a part of a main part of a press apparatus according to the present invention is shown in cross section.
FIG. 2 is a schematic control circuit of one embodiment of a group of servo motors of the electric press apparatus having the structure shown in FIG.
FIG. 3 is a front view of another embodiment in which a part of the main part of the press device according to the present invention is shown in cross section.
FIG. 4 is a schematic control circuit of an embodiment of one group of servo motors of the electric press apparatus having the structure shown in FIG. 3;
FIG. 5 is a schematic explanatory diagram of an electric press device using a plurality of screw shafts.
FIG. 6 is an enlarged explanatory view of a moving mechanism used in FIG.
[FIG. 7] A part of the main part of the press apparatus according to the present invention provided with a rapid feed mechanism is shown in cross section.
It is one Example front view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 101 Bed 102 Crown 103 Post 104 Frame 105 Slider 107 Upper mold 108, 128 Mounting base 109, 129a, 129b, 139a, 139b AC servo motor 116a, 116b Gear 119 Ball screw mechanism with differential mechanism 123a, 123b Ball screw nut 124 Differential mechanism 125 Lower mold 126 Pulse scale 127 Detector

Claims (6)

A frame formed by a bed, a crown, and a plurality of columns;
A slider on which the upper mold is attached to the lower end surface and freely slides on the support;
A screw shaft provided with a ball screw portion and rotatably supported by the crown;
A ball screw mechanism provided on the slider, which includes a ball screw nut screwed with a ball screw portion provided on the screw shaft, and moves the slider up and down by rotation of the screw shaft;
A motor that rotates the screw shaft;
A lower mold installed corresponding to the bed in a position corresponding to the upper mold,
A position detector for detecting the position of the upper mold,
On the basis of the position signal detected by the position detector, an electric press device comprising a control device that presses the workpiece placed on the lower mold by moving the slider up and down by rotating the screw shaft.
At least four mounting bases are provided on the top surface of the crown,
For each of the mounting bases, a plurality of screw shafts are provided in association with each other, and the ball screw mechanism is provided corresponding to each of the screw shafts,
The motor for rotating the screw shaft includes one motor, and a gear is provided between the output shaft of the motor and each screw shaft forming the group, and the rotational torque of the output shaft of the motor is It is configured to be transmitted to each of a plurality of screw shafts corresponding to each mounting base,
One of the motors provided corresponding to each of the mounting bases drives the plurality of screw shafts provided for the individual mounting bases together to rotate the corresponding ball screw. An electric press device characterized by moving a slider up and down through a mechanism. The electric press apparatus according to claim 1, wherein the motor is a servo motor . The electric press device according to claim 2, wherein the servo motor is numerically controlled by a signal from a control device. A frame formed by a bed, a crown, and a plurality of columns;
A slider on which the upper mold is attached to the lower end surface and freely slides on the support;
A screw shaft provided with a ball screw portion and rotatably supported by the crown;
A ball screw mechanism provided on the slider, which includes a ball screw nut screwed with a ball screw portion provided on the screw shaft, and moves the slider up and down by rotation of the screw shaft;
A motor that rotates the screw shaft;
A lower mold installed corresponding to the bed in a position corresponding to the upper mold,
A position detector for detecting the position of the upper mold,
A control device that presses the workpiece placed on the lower die by moving the slider up and down by rotating the screw shaft based on the position signal detected by the position detector;
In the electric press device provided with
At least four mounting bases are provided on the top surface of the crown,
For each of the mounting bases, a plurality of screw shafts are provided in association with each other, and the ball screw mechanism is provided corresponding to each of the screw shafts,
The motor for rotating the screw shaft is composed of a plurality of main and sub motors, respectively, and includes a drive shaft configured to obtain a combined torque by the cooperative operation of the plurality of motors. A gear is provided between each of the screw shafts corresponding to the mounting base of the motor, and a combined rotational torque of the output shafts of the plurality of motors is transmitted to each of the plurality of screw shafts forming the group. Composed of
A plurality of the motors provided corresponding to the respective mounting bases rotate together the plurality of screw shafts provided for the individual mounting bases, and the corresponding ball screws. Move the slider up and down through the mechanism
The electric press apparatus characterized by the above-mentioned. The electric press apparatus according to claim 4 , wherein the motor is a servo motor.   6. The electric press device according to claim 5, wherein the servo motor is numerically controlled by a signal from a control device.

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