JP2014039941A - Slide position detection device and presse machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a slide position detection device capable of allowing inclination of a slide and exhibiting high position detection accuracy, and a press machine.SOLUTION: A press machine P includes a slide position detection device A detecting the position of a slide 5 in relation to a frame 3. The slide position detection device A includes: a rack 10 provided in the slide 5; a pinion 20 provided in the frame 3 to be engaged with the rack 10; slide position arithmetic means 23 calculating the position of the slide 5 on the basis of a rotation amount of the pinion 20; guide means 31 provided in the frame 3 to movably support the rack 10; and rotation support means 43 provided between the slide 5 and the rack 10 to rotatably support the rack 10. Even if the slide 5 is inclined, the rack 10 is rotated in relation to the slide 5 by the rotation support means 43 so as to maintain the attitude of the rack 10 in relation to the pinion 20 while allowing inclination of the slide 5, thereby increasing position detection accuracy of the slide position detection device A.

Description

  The present invention relates to a slide position detection device and a press machine. More specifically, the present invention relates to a slide position detection device and a press machine that are attached to a press machine and detect the position of the slide.

As an example of a slide position detection device attached to a press machine, a slide position detection device of a rack and pinion mechanism is known (for example, Patent Document 1).
As shown in FIGS. 8 and 9, the slide position detecting device 130 described in Patent Document 1 includes a link shaft support member 131 that protrudes from the slide 114 toward the upright 111, and one end side of the link position support device 131. A biaxial link member 132 that is rotatably supported and suspended, a plate member 133 that is rotatably supported and suspended on the other end side of the biaxial link member 132, and a plate member 133 that extends in the hanging direction. A rack 134 to be installed, a pinion 135 that meshes with the rack 134, and an encoder device 140 that detects the rotation of the pinion 135 are provided. The play gaps A and B are provided between the biaxial link member 132 and the link support member 131, and the play gaps C and D are provided between the biaxial link member 132 and the plate member 133. The pinion 135 and the encoder device 140 are fixed to the upright 111 side. The plate member 133 is guided to move up and down along the upright 111 by guide roller mechanisms 150 and 155 fixed to the upright 111 side.

In the case of a large press machine, the clearance between the slide and the slide guide is designed to be relatively large in consideration of thermal expansion and the like. For this reason, the slide becomes easy to be tilted due to the large clearance, and the tilt makes the position detection accuracy of the slide position detecting device worse.
As shown in FIG. 8, the conventional slide position detecting device 130 allows the inclination of the slide 114 in the ZY plane by the rotation of the biaxial link member 132, and as shown in FIG. 9, the slide 114 in the ZX plane. Is allowed by sliding the plate member 133 in the ± X direction with respect to the slide 114 by the play gaps A, B, C, and D, and further bending the plate member 133.

JP 2008-307548 A

The conventional slide position detecting device 130 has the following problems.
(1) There are the following problems when the inclination of the slide 114 in the ZX plane is allowed.
a) The play gaps A, B, C, and D are narrow, and the bending of the plate member 133 is limited, so that there is a problem that it cannot be allowed if the inclination of the slide 114 in the ZX plane increases.
b) The biaxial link member 132 slides along the first pivotal support member 1301, and the plate member 133 is configured to slide along the second pivotal support member 1302, but the pivotal support member 1301, Since no force is generated in the direction parallel to 1302, the biaxial link member 132 and the plate member 133 do not slide smoothly. If the clearance between the support-side shaft support hole 1321 of the biaxial link member 132 and the first shaft support member 1301 is increased and the clearance between the shaft support hole 1331 of the plate member 133 and the second shaft support member 1302 is increased, 2 Although the shaft link member 132 and the plate member 133 are easily slid, there is a problem that the reproducibility of the position detection is deteriorated due to rattling caused by increasing the gap.

(2) Especially in press machines that perform superplastic forging, a position detection accuracy of 0.01 mm is required to perform fine pressurization control with a pressurization speed of about 0.01 mm / sec. 130 has a gap between the plate member 133 and the guide roller mechanisms 150 and 155 in addition to a gap between the shaft support holes 1321 and 1331 and the shaft support members 1301 and 1302, and the position detection accuracy is deteriorated.

(3) In the case of a large press machine, the clearance between the slide and the slide guide is large, and the inclination of the slide tends to increase. However, the conventional slide position detection device 130 supports the large inclination of the slide 114. In order to do so, it is necessary to make the play gaps A, B and C, D large, and the position detection accuracy deteriorates.

  In view of the above circumstances, an object of the present invention is to provide a slide position detection device and a press machine that can tolerate the inclination of the slide and have high position detection accuracy.

A press machine according to a first aspect of the present invention is a press machine for press-molding a workpiece, a frame, a slide that can slide with respect to the frame, and a slide position detection device that detects the position of the slide with respect to the frame. The slide position detecting device includes a rack provided on one of the frame or the slide, a pinion provided on the other of the frame or the slide and meshing with the rack, and a rotation amount of the pinion Slide position calculating means for calculating the position of the slide based on the guide, guide means provided on the other of the frame or the slide and movably supporting the rack, the one of the frame or the slide and the rack Rotation support hand that is provided between and supports the rack rotatably. And having a, the.
A press machine according to a second invention is the press machine according to the first invention, wherein the slide position detection device is provided between the frame or the one of the slides and the rotation support means, and the rotation support member is moved to the slide. It further has the 2nd guide means supported so that movement to the X direction orthogonal to the slide direction of this is possible.
A press machine according to a third aspect of the present invention is the press machine according to the second aspect, wherein the slide position detecting device is provided between the frame or the one of the slides and the rotation support means, and the rotation support member is moved to the slide. It further has the 3rd guide means supported so that movement to the Y direction which intersects perpendicularly with the above-mentioned slide direction and intersects the above-mentioned X direction is possible.
A slide position detecting device according to a fourth aspect of the invention is a slide position detecting device for detecting the position of a slide with respect to a frame provided in a press machine, the rack provided on either the frame or the slide, and the frame Or a pinion that is provided on the other side of the slide and meshes with the rack; a slide position calculation means that calculates the position of the slide based on the rotation amount of the pinion; and provided on the other side of the frame or the slide, Movably supporting guide means, and a pivot support means provided between the one of the frame or the slide and the rack for pivotally supporting the rack. .
According to a fourth aspect of the present invention, there is provided the slide position detecting device according to the fourth aspect, wherein the slide support member is provided between the one of the frame or the slide and the rotation support means, and the rotation support member is orthogonal to the slide direction of the slide. It further comprises second guide means for supporting movement in the X direction.
According to a sixth aspect of the present invention, in the fifth aspect of the invention, the slide position detecting device is provided between the frame or the slide and the rotation support means, and the rotation support member is orthogonal to the slide direction of the slide. And further comprising third guide means for supporting movement in the Y direction intersecting with the X direction.

According to the first invention, even when the slide is inclined, the rack is rotated with respect to the frame or the slide by the rotation support means, so that the attitude of the rack with respect to the pinion can be maintained while allowing the inclination of the slide. The position detection accuracy of the position detection device is increased.
According to the second aspect of the present invention, even if the slide moves in the X direction, the rack is moved with respect to the frame or the slide by the second guide means, so that the position of the rack relative to the pinion can be maintained while allowing the slide to move. Therefore, the position detection accuracy of the slide position detection device is increased.
According to the third invention, even if the slide moves in the Y direction, the rack is moved with respect to the frame or the slide by the third guide means, so that the rack can be maintained with respect to the pinion while allowing the slide to move. Therefore, the position detection accuracy of the slide position detection device is increased.
According to the fourth invention, even if the slide is tilted, the rack is rotated with respect to the frame or the slide by the rotation support means, so that the attitude of the rack with respect to the pinion can be maintained while allowing the tilt of the slide. The position detection accuracy of the position detection device is increased.
According to the fifth aspect of the present invention, even if the slide moves in the X direction, the rack position with respect to the pinion can be maintained while allowing the slide to move by moving the rack with respect to the frame or the slide by the second guide means. Therefore, the position detection accuracy of the slide position detection device is increased.
According to the sixth aspect of the invention, even if the slide moves in the Y direction, the rack can be maintained with respect to the pinion while allowing the slide to move by moving the rack relative to the frame or the slide by the third guide means. Therefore, the position detection accuracy of the slide position detection device is increased.

It is a front view of the slide position detection apparatus which concerns on 1st Embodiment of this invention. It is a side view of the slide position detection device. FIG. 3 is a cross-sectional view taken along line III in FIG. 1. (A) is a sectional view taken along line IVa in FIG. 1, and (b) is a sectional view taken along line IVb in FIG. It is a front view of a press machine provided with the slide position detecting device. It is a side view of the press machine. It is an enlarged view of the meshing | engagement part of the rack and pinion of the slide position detection apparatus which concerns on 2nd Embodiment of this invention. It is a front view of the conventional slide position detection apparatus. It is a side view of the slide position detection device.

Next, an embodiment of the present invention will be described with reference to the drawings.
(First embodiment)
As shown in FIGS. 5 and 6, the press machine P has a frame f including a crown 1, a bed 2, and four uprights 3 erected between them. The crown 1 is provided with a pressure cylinder 4, and a slide 5 is fixed to the piston of the pressure cylinder 4. The slide 5 is slidable with respect to the frame f. When the pressure cylinder 4 extends, the slide 5 descends, and an upper mold attached to the slide 5 and a lower mold attached to the bed 2 are: Press molding can be performed by pressurizing the product.

  In the following, the sliding direction of the slide 5 (up and down direction in FIGS. 5 and 6) is the Z direction, and the width direction (left and right direction in FIG. 5) of the press machine P perpendicular to the Z direction is the X direction, Z direction and X direction. The depth direction (left-right direction in FIG. 6) of the orthogonal press machine P is referred to as the Y direction. The X direction and the Y direction do not necessarily coincide with the X direction and the Y direction described in the claims. The X direction described in the claims may be a direction orthogonal to the slide direction, and may be a width direction of the press machine, a depth direction, or an oblique direction therebetween. Further, the Y direction described in the claims may be a direction orthogonal to the sliding direction and intersecting the X direction, and may be a direction intersecting obliquely as well as a direction orthogonal to the X direction. Good.

  In the case of the large press machine P, the clearance between the slide 5 and the slide guide (not shown) is designed to be relatively large in consideration of thermal expansion and the like. Therefore, the slide 5 is easily inclined in the ZX plane and the ZY plane due to the large clearance, and is easily moved in the X direction and the Y direction.

The slide position detection apparatus A according to the first embodiment of the present invention is an apparatus that is attached to such a press machine P and detects the position (slide position) of the slide 5 with respect to the frame f. In this embodiment, the press machine P is provided with four slide position detection devices A. Hereinafter, among the four slide position detection devices A, the slide position detection device A provided on the right side in FIG. 5 and on the right side in FIG. 6 will be described as an example.
The slide position detection device A is not limited to the hydraulic press as described above, but can be attached to various press machines such as a servo press and a hydraulic press.

As shown in FIGS. 1 and 2, the slide position detecting device A includes a rack 10 provided on the slide 5 side of the press machine P and a pinion 20 provided on the upright 3 side and meshing with the rack 10. ing. As the slide 5 moves up and down, the rack 10 moves up and down, and the pinion 20 rotates as the rack 10 moves up and down. An encoder 22 is connected to the pinion 20 via a shaft 21 so that the encoder 22 can detect the rotation amount of the pinion 20. A slide position calculation means 23 is connected to the encoder 22 so that the slide position can be calculated from the detection result of the encoder 22 (the amount of rotation of the pinion 20).
Thus, since the slide position detection apparatus A is a rack and pinion mechanism, the slide position can be detected even when the slide stroke is long, such as a large press machine P.

A support member 30 is fixed to the upright 3, and a Z-direction linear guide 31 is provided on the support member 30. The Z-direction linear guide 31 includes a rail 31a and a block 31b that travels along the rail 31a. The block 31b is fixed to the support member 30, and the rail 31a can travel in the Z direction. The rack 10 is attached to the rail 31a along the longitudinal direction. Therefore, the rack 10 is supported by the Z-direction linear guide 31 so as to be movable in the Z direction. Further, the rack 10 is supported so that the tooth surface thereof faces the negative direction of the Y direction.
The Z-direction linear guide 31 corresponds to the guide means described in the claims.

  A support member 32 that protrudes horizontally toward the slide 5 is fixed to the lower end of the support member 30, and a pinion linear guide 33 is provided on the upper surface of the support member 32. The pinion linear guide 33 includes a rail 33a and a block 33b that travels along the rail 33a. The rail 33a is fixed to the upper surface of the support member 32 along the Y direction, and the block 33b can travel in the Y direction.

  As shown in FIG. 3, a support 34 for the encoder 22 is fixed on a block 33b, the encoder 22 is fixed to the support 34, and the shaft 21 is supported by a bearing. Therefore, the pinion 20 is supported so as to be movable in the Y direction. A spring 35 is provided between the support 34 and the support member 32 along the Y direction, and urges the support 34 toward the rack 10 along the Y direction. That is, the pinion 20 is biased toward the rack 10. Instead of the spring 35, other urging means such as a cylinder may be used.

  Thus, by pressing the pinion 20 against the rack 10, backlash, which is a gap between the teeth of the pinion 20 and the teeth of the rack 10, is eliminated, and a so-called non-backlash structure is obtained. Therefore, it is possible to prevent the position detection accuracy of the slide position detection device A from being lowered due to backlash, and to increase the position detection accuracy.

  A hole 32h is formed in the support member 32, and the rail 31a and the rack 10 of the Z-direction linear guide 31 are passed through the hole 32h so that the support member 32 does not interfere with the rail 31a and the rack 10. Has been.

  As shown in FIGS. 1 and 2, the slide 5 is provided with a Y-direction linear guide 41, the Y-direction linear guide 41 is provided with an X-direction linear guide 42, and the X-direction linear guide 42 has A spherical bearing 43 is provided. The lower end of the rack 10 is supported by a spherical bearing 43. That is, the spherical bearing 43 is provided between the slide 5 and the rack 10, and the X direction linear guide 42 and the Y direction linear guide 41 are provided between the slide 5 and the spherical bearing 43. The X direction linear guide 42 and the Y direction linear guide 41 support the spherical bearing 43 so as to be movable in the Y direction and the X direction.

  As shown in FIG. 4A, the Y-direction linear guide 41 includes a rail 41a and a block 41b that travels along the rail 41a. The rail 41a is fixed to the slide 5 along the Y direction, and the block 41b can travel in the Y direction. An intermediate plate 44 is fixed on the block 41b.

The intermediate plate 44 is provided with Y direction restoring means 45. The Y direction restoring means 45 includes a pin 45a having flanges formed at both ends, a ring 45b inserted into the pin 45a, and a pair of coil springs 45c and 45c. The pin 45a protrudes from the side surface of the intermediate plate 44 along the Y direction. The pair of coil springs 45c and 45c are inserted on both sides of the ring 45b, and are sandwiched between the flange of the pin 45a and the ring 45b, respectively. Therefore, the ring 45b is urged so as to be located at the center in the longitudinal direction of the pin 45a. The ring 45b is fixed to the slide 5, and even if the intermediate plate 44 is moved in the Y direction by the Y-direction linear guide 41, the ring 45b returns to a predetermined position located at the center in the longitudinal direction of the pin 45a. ing.
Instead of the Y-direction restoring unit 45, a restoring unit having another configuration in which the intermediate plate 44 returns to a predetermined position in the Y direction may be used.

  As shown in FIG. 4B, the X-direction linear guide 42 includes a rail 42a and a block 42b that travels along the rail 42a. The rail 42a is fixed to the upper surface of the intermediate plate 44 along the X direction (see FIG. 4A), and the block 42b can travel in the X direction. A spherical bearing 43 is fixed on the block 42b.

As shown in FIG. 4A, the intermediate plate 44 is provided with an X direction restoring means 46. The X-direction restoring means 46 includes a pin 46a having flanges formed at both ends, a ring 46b inserted into the pin 46a, and a pair of coil springs 46c and 46c. The pin 46a is provided on the side surface of the intermediate plate 44 along the X direction. The pair of coil springs 46c and 46c are inserted on both sides of the ring 46b, and are sandwiched between the flange of the pin 46a and the ring 46b, respectively. Therefore, the ring 46b is urged so as to be positioned at the center in the longitudinal direction of the pin 46a. As shown in FIG. 4B, a tongue piece 43c protruding in the X direction is fixed to the spherical bearing 43, and a ring 46b is fixed to the tongue piece 43c. Therefore, even if the spherical bearing 43 is moved in the X direction by the X direction linear guide 42, the ring 46b is configured to return to a predetermined position located at the center in the longitudinal direction of the pin 46a.
Instead of the X direction restoring means 46, a restoring means having another configuration in which the spherical bearing 43 returns to a predetermined position in the X direction may be used.

  As shown in FIGS. 1 and 2, the spherical bearing 43 includes an inner ring 43a and an outer ring 43b that are in spherical contact with each other. The lower end of the rack 10 is fixed to the inner ring 43a, and the outer ring 43b is fixed to the block 42b of the X-direction linear guide 42. Therefore, the rack 10 is supported so as to be rotatable with respect to the slide 5 in the ZX plane and the ZY plane.

The spherical bearing 43 corresponds to the rotation support means described in the claims. The rotation support means is a means capable of rotating in all directions around the Z direction as well as in a single plane. As the rotation support means, a spherical bush or the like may be used in addition to the spherical bearing 43 such as a deep groove ball bearing or a self-aligning roller bearing.
The Y-direction linear guide 41 corresponds to the second guide means or the third guide means described in the claims, and the X-direction linear guide 42 is the third guide means or the second guide means described in the claims. It corresponds to.

Even if the slide 5 is inclined, the rack 10 is rotated with respect to the slide 5 in the ZX plane and the ZY plane by the spherical bearing 43 while allowing the inclination of the slide 5 even when the slide 5 is inclined. The attitude of the rack 10 can be maintained along the upright 3. That is, the attitude of the rack 10 with respect to the pinion 20 provided on the upright 3 side can be maintained.
Further, even if the slide 5 moves in the X direction and the Y direction, the rack 10 is moved relative to the slide 5 by the X direction linear guide 42 and the Y direction linear guide 41, thereby allowing the slide 5 to move up. The positional relationship with the light 3 can be maintained. That is, the attitude of the rack 10 with respect to the pinion 20 provided on the upright 3 side can be maintained.
Therefore, the rack 10 does not bend or tilt with respect to the pinion 20 due to the tilt or movement of the slide 5, and the tooth contact between the rack 10 and the pinion 20 is not affected. Becomes higher.

  The X-direction restoring means 46 and the Y-direction restoring means 45 are arranged such that the rings 45b and 46b are located at the center in the longitudinal direction of the pins 45a and 46a in a state where the slide 5 is not inclined and is not moved in the X and Y directions. Is configured to do. Therefore, when the slide 5 is tilted or moved, a restoring force for returning the rack 10 to the original position is generated. When the slide 5 returns from the tilted or moved state to the original state, the rack 10 can be returned to the original position by the restoring force, so that the rack 10 can be prevented from being bent.

  As the Z-direction linear guide 31, it is preferable to adopt a configuration in which a preload is applied between the rail 31 a and the block 31 b to reduce the gap between them. By doing so, the rail 31a can run without rattling or tilting, and the rack 10 is always guided in the Z direction. Therefore, the tilt and movement of the slide 5 do not affect the tooth contact between the rack 10 and the pinion 20. The position detection accuracy of the position detection apparatus A is increased.

  Similarly, the Y-direction linear guide 41 and the X-direction linear guide 42 should be configured so that there is little clearance between them, for example, by applying preload between the rails 41a, 42a and the blocks 41b, 42b. Is preferred. Further, it is preferable that the spherical bearing 43 has a configuration in which a preload is applied between the inner ring 43a and the outer ring 43b or a gap between them is small due to the weight of the rack 10. By doing so, the backlash between the rack 10 and the slide 5 is reduced, and the position detection accuracy of the slide position detection device A is increased.

(Second Embodiment)
In the above embodiment, the backlash is eliminated by pressing the pinion 20 against the rack 10 with the spring 35, but other configurations are possible as long as the play between the teeth of the pinion 20 and the teeth of the rack 10 is eliminated. It may be adopted.

The slide position detection apparatus according to the second embodiment of the present invention has a configuration in which a servo motor is provided instead of the encoder 22 of the first embodiment. As the pinion 20 rotates, the servo motor is rotated. The servo motor has a built-in encoder, and by detecting the rotation of the output shaft of the servo motor by the encoder, the rotation of the pinion 20 can be detected indirectly. In addition, a slide position calculation means 23 is connected to the servo motor so that the slide position can be calculated from the detection result of the encoder.
In the present embodiment, the pinion linear guide 33 and the spring 35 in the first embodiment are not necessary, and the support 34 may be fixed to the support member 32.

  As shown in FIG. 7, the servo motor generates torque in one direction (for example, the direction of arrow a in FIG. 7) on the pinion 20 and drives the torque of the pinion 20 to always act on the rack 10. . Therefore, regardless of whether the slide 5 is moving up or down, one pitch surface 10a of the teeth of the rack 10 always comes into contact with one pitch surface 20a of the teeth of the pinion 20, and their pitches There is no backlash between the surfaces 10a, 20a. Therefore, it is possible to prevent the position detection accuracy of the slide position detection device from being lowered due to backlash, and to increase the position detection accuracy.

(Third embodiment)
In the slide position detection device of the above embodiment, the rack 10 is provided on the slide 5 side and the pinion 20 is provided on the upright 3 side, but the pinion 20 is provided on the slide 5 side and the rack is on the upright 3 side. 10 may be provided. Even with this configuration, the pinion 20 moves up and down as the slide 5 moves up and down, and the pinion 20 rotates relative to the rack 10 fixed to the upright 3. The slide position can be calculated by the encoder 22 and the slide position calculation means 23 connected to the pinion 20.

  In this case, the support member 30 is fixed to the slide 5, and the rack 10 is movably supported by the Z-direction linear guide 31 provided on the support member 30. Further, the pinion 20 is pivotally supported on the support member 30. The spherical bearing 43 that supports the end of the rack 10 is provided between the upright 3 and the rack 10, and the X-direction linear guide 42 and the Y-direction linear guide 41 are provided between the upright 3 and the spherical bearing 43. It has been. The X direction linear guide 42 and the Y direction linear guide 41 support the spherical bearing 43 so as to be movable in the Y direction and the X direction.

In the present embodiment, as the slide 5 tilts, the rack 10 is rotated with respect to the upright 3 in the ZX plane and the ZY plane by the spherical bearing 43, thereby allowing the rack 10 to be tilted while allowing the slide 5 to tilt. Can be maintained in a state along the slide 5. That is, the attitude of the rack 10 with respect to the pinion 20 provided on the slide 5 side can be maintained.
Further, as the slide 5 moves in the X direction and the Y direction, the rack 10 is moved with respect to the upright 3 by the X direction linear guide 42 and the Y direction linear guide 41, thereby allowing the slide 5 to move. The positional relationship with the slide 5 can be maintained. That is, the attitude of the rack 10 with respect to the pinion 20 provided on the slide 5 side can be maintained.
Therefore, the rack 10 does not bend or tilt with respect to the pinion 20 due to the tilt or movement of the slide 5, and the tooth contact between the rack 10 and the pinion 20 is not affected. Becomes higher.

(Other embodiments)
The number of slide position detecting devices provided in one press machine P is arbitrary, and may be provided at four corners of the slide 5, or may be provided at both ends of the slide 5, or less than that. May be.

DESCRIPTION OF SYMBOLS 1 Crown 2 Bed 3 Upright 4 Pressure cylinder 5 Slide 10 Rack 20 Pinion 21 Axis 22 Encoder 23 Slide position calculating means 30 Support member 31 Z direction linear guide 32 Support member 33 Pinion linear guide 34 Support body 35 Spring 41 Y direction Linear guide 42 X-direction linear guide 43 Spherical bearing 44 Intermediate plate 45 Y-direction restoring means 46 X-direction restoring means

Claims (6)

A press machine for press-molding a workpiece,
Frame,
A slide slidable with respect to the frame;
A slide position detecting device for detecting a position of the slide with respect to the frame;
The slide position detection device includes:
A rack provided on either the frame or the slide;
A pinion provided on the other of the frame or the slide and meshing with the rack;
Slide position calculating means for calculating the position of the slide based on the rotation amount of the pinion;
Guide means provided on the other of the frame or the slide and movably supporting the rack;
A press machine comprising rotation support means provided between the one of the frame or the slide and the rack, and rotatably supporting the rack. The slide position detecting device is provided between the one of the frame or the slide and the rotation support means, and supports the rotation support member so as to be movable in the X direction orthogonal to the slide direction of the slide. The press machine according to claim 1, further comprising second guide means. The slide position detection device is provided between the one of the frame or the slide and the rotation support means, and the rotation support member is orthogonal to the slide direction of the slide and intersects the X direction. The press machine according to claim 2, further comprising third guide means that is movably supported in the Y direction. A slide position detecting device for detecting a position of a slide with respect to a frame provided in a press machine,
A rack provided on either the frame or the slide;
A pinion provided on the other of the frame or the slide and meshing with the rack;
Slide position calculating means for calculating the position of the slide based on the rotation amount of the pinion;
Guide means provided on the other of the frame or the slide and movably supporting the rack;
A slide position detecting device, comprising: a rotation support unit provided between the one of the frame or the slide and the rack, and rotatably supporting the rack. Second guide means is provided between the one of the frame or the slide and the rotation support means, and supports the rotation support member so as to be movable in the X direction orthogonal to the slide direction of the slide. The slide position detecting device according to claim 4, wherein Provided between the one of the frame or the slide and the rotation support means, and supports the rotation support member so as to be movable in the Y direction perpendicular to the slide direction of the slide and intersecting the X direction. The slide position detecting device according to claim 5, further comprising third guide means.

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