Whetstone device and machine tool

Abstract

To provide a technique capable of controlling tension of a belt of a whetstone device while supporting a rotation driver stably.SOLUTION: A whetstone device is assembled with a base, a whetstone rotation supporter, a whetstone rotation driver, a belt wound over a follower pulley and a drive pulley, a guide, a fixer, and a supporter supporting the whetstone rotation driver from a lower side. The whetstone rotation driver includes a surface to be contacted inclined to a vertical axis line, the supporter includes a piece member and a screw shaft, and the supporter is constituted so as to control a tension of the belt by moving the whetstone rotation driver in the vertical direction by moving a contact surface in a direction to be close to and in a direction to be away from the surface to be contacted by rotation of a screw shaft.SELECTED DRAWING: Figure 7

Description

[Technical field]

[0001] The present disclosure relates to the art of grinding stone devices. [Background technology]

[0002] Conventionally, a technology is known that includes a rotating shaft, a driven pulley attached to the rotating shaft, an output shaft of a motor, a driving pulley attached to the output shaft, and a belt stretched between the driving pulley and the driven pulley, and transmits rotation of the output shaft to the rotating shaft. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 63-45252 Summary of the Invention [Problem to be solved by the invention]

[0004] In the conventional technology, the belt tension is adjusted by slightly moving the motor base to which the motor is attached in the horizontal direction using the lead of the screw part. However, there is a demand for a technology that can adjust the belt tension while stably supporting the motor base, the motor, and the rotary drive device having the drive pulley. Such a problem is also common to grinding devices. [Means for solving the problem]

[0005] The present disclosure can be realized in the following forms.

[0006] (1) According to one embodiment of the present disclosure, there is provided a grindstone device comprising: a base extending in a vertical direction; a grindstone rotation support device having a grindstone spindle rotating about a horizontal axis, a grindstone attached to one end of the grindstone spindle, and a driven pulley attached to the other end of the grindstone spindle; a grindstone rotation drive device installed above the grindstone rotation support device having a drive shaft rotating about a horizontal axis and a drive pulley attached to the drive shaft; a belt stretched between the driven pulley and the drive pulley; and a guide rail provided between the base and the grindstone rotation drive device to immobilize the grindstone rotation drive device in the horizontal direction relative to the base and to guide the grindstone rotation drive device in the up-down direction along the vertical direction. According to the embodiment, the grindstone rotation drive device includes a guide device, a fixing device for fixing the grindstone rotation drive device to the base at an arbitrary position in the vertical direction, and a support device for supporting the grindstone rotation drive device from below, the grindstone rotation drive device having an abutment surface inclined with respect to a vertical axis, the support device having a bridge member having an abutment surface facing the abutment surface and in surface contact with the abutment surface, and a screw shaft having a screw portion screwed into the bridge member and rotating about a horizontal axis, the support device is configured to move the abutment surface toward or away from the abutment surface by rotation of the screw shaft, thereby moving the grindstone rotation drive device in the vertical direction to adjust the tension of the belt. (2) In the above embodiment, the bridge member may be a first bridge member, the abutment surface may be a first abutment surface, the threaded portion may be a first threaded portion, the abutted surface may be a first abutted surface, the grindstone rotation drive device may further have a second abutted surface inclined in a direction opposite to the first abutted surface with respect to the vertical axis, the threaded portion may have the first threaded portion and a second threaded portion having a reverse thread to the first threaded portion, the support device may further have a second bridge member having a second abutment surface facing the second abutted surface and in surface contact with the second abutted surface, and the support device may be configured to move the grindstone rotation drive device in the vertical direction to adjust the tension of the belt by moving the first bridge member and the second bridge member closer to or farther away from each other by rotating the screw shaft. According to this embodiment, the grindstone rotation drive device can be prevented from moving in the horizontal direction by sandwiching it between the first bridge member and the second bridge member. Furthermore, the grindstone rotation drive device can be easily moved up and down by the first piece member and the second piece member. (3) In the above embodiment, the grindstone rotation drive device may further include a rotation drive motor having the drive shaft, a motor base to which the rotation drive motor is fixed and which is guided in the up-down direction by the guiding device, and a triangular base installed below the motor base and which has the first abutted surface and the second abutted surface, the triangular base further includes a first contact surface that contacts the motor base, and the motor base further includes a second contact surface that is in surface contact with the first contact surface, and the first contact surface and the second contact surface may be configured to allow mutual movement in the horizontal direction. According to this embodiment, even if the triangular base moves slightly in the horizontal direction due to the first piece member and the second piece member, the first contact surface and the second contact surface slide against each other to absorb the slight movement, thereby preventing the slight movement from being transmitted to the motor base. (4) In the above embodiment, the actuator may further include a first regulating structure that regulates movement of the first piece member in a predetermined regulating direction perpendicular to the up-down direction relative to the triangular base, and a second regulating structure that regulates movement of the second piece member in the regulating direction relative to the triangular base, wherein the first regulating structure includes a first convex portion formed on one of the first abutment surface and the first abutted surface, and a first groove portion formed on the other of the first abutment surface and the first abutted surface, into which the first convex portion fits, the first groove portion extending along a first inclination direction in which the first abutted surface is inclined, and the second regulating structure may include a second convex portion formed on one of the second abutment surface and the second abutted surface, and a second groove portion formed on the other of the second abutment surface and the second abutted surface, into which the second convex portion fits, the second groove portion extending along a second inclination direction in which the second abutted surface is inclined. According to this embodiment, even if an external force is applied to the triangular base due to maintenance work or the like, the triangular base can be prevented from coming off the first and second bridge members and falling. (5) In the above embodiment, the guiding device includes a first guide surface formed on the base, the first guide surface being parallel to the vertical axis; a first guided surface formed on the motor base and in surface contact with the first guide surface; a second guide surface protruding from one left-right end side of the base toward a front side on which the rotary drive motor is located, the second guide surface being parallel to the vertical axis, inclined with respect to the first guide surface, and facing the first guide surface; a second guided surface formed on the motor base and in surface contact with the second guide surface; The motor base may have a third guide surface located at the other end side in the left-right direction, the third guide surface being parallel to the vertical axis and facing the base across the motor base, and a third guided surface facing the third guide surface and formed on the motor base so as to be capable of surface contact with the third guide surface, the third guide surface being formed on a tipping prevention member that is detachably fixed to the base and prevents the motor base from moving away from the base, and the motor base may be configured to be detachable from the base when the tipping prevention member is removed from the base. According to this embodiment, the tipping prevention member can prevent the motor base from moving away from the base, so that the grindstone rotation drive device fixed to the motor base can be prevented from tipping under its own weight. Also, when the tipping prevention member is removed from the base, the grindstone rotation drive device can be removed from the base. (6) In the above embodiment, the fixing device includes a pair of clamping members arranged at a distance in the up-down direction on one end side of the base in the left-right direction, and a locking member inserted through each of the pair of clamping members and screwed into the base with each clamping member pressed against the base and the motor base, and the clamping members include a first clamping surface parallel to the up-down direction and in surface contact with a motor base side surface that is a side surface of the motor base, and a second clamping surface parallel to the up-down direction and in surface contact with a base side surface that is a side surface of the base, and the first clamping surface and the second clamping surface may be inclined with respect to the left-right direction so as to apply an external force to the base and the motor base in a direction that sandwiches the base and the motor base when the clamping member is pressed against the base and the motor base. According to this embodiment, by applying an external force to the base and the motor base in a direction in which the base and the motor base are sandwiched between the first clamping surface and the second clamping surface, the grindstone rotation drive device including the motor base can be fixed to the base. (7) According to another aspect of the present disclosure, a machine tool is provided. The machine tool includes a grindstone device according to any one of the above aspects, a guide table that guides and supports the grindstone device in the vertical direction, a first feed device that feeds the grindstone device in the vertical direction relative to the guide table, a cross beam that guides the guide table in the horizontal direction, a second feed device that feeds the guide table in the horizontal direction relative to the cross beam, and a rotating table device that is installed below the grindstone device and rotates around a vertical axis. According to this aspect, the grindstone device can be moved in the vertical direction and the horizontal direction to machine a workpiece on the rotating table device. The present disclosure may be realized in various forms other than the grindstone device and the machine tool, for example, in the form of a manufacturing method of the grindstone device or the machine tool. [Brief description of the drawings]

[0007] [Figure 1] 1 is a schematic diagram showing a machine tool according to an embodiment as viewed from the front; [Diagram 2] FIG. 1 is a schematic diagram of a grinding device viewed from the front side. [Diagram 3] Schematic diagram of the grinding device seen from the left side. [Figure 4] Schematic diagram of the grinding device seen from the right side. [Diagram 5] FIG. [Figure 6] FIG. 2 is a cross-sectional view in the XZ plane near the locking member and the retaining member. [Figure 7] FIG. 4 is a front view of an area including a support device in the grinding device. [Figure 8] 8 is a cross-sectional view taken along line VIII-VIII in FIG. 7 . [Figure 9] FIG. 4 is a diagram for explaining a method for adjusting the tension of a belt. [Figure 10] FIG. 4 is a schematic diagram for explaining a grinding device according to another embodiment 1. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] A. Embodiment: FIG. 1 is a schematic diagram of a machine tool 10 in an embodiment as viewed from the front. In FIG. 1, arrows representing the X-axis, Y-axis, and Z-axis, which are orthogonal to each other, are shown. The Y-axis is a coordinate axis parallel to the vertical direction. The arrows representing the X-axis, Y-axis, and Z-axis in FIG. 1 and the arrows representing the X-axis, Y-axis, and Z-axis in other figures point in the same direction. When specifying a direction, positive and negative signs are used in combination to indicate the direction, with the positive direction indicated by the arrow being "+" and the negative direction opposite to the direction indicated by the arrow being "-". Hereinafter, the +Y direction is also referred to as the "upward direction" and the -Y direction is also referred to as the "downward direction". The direction along the horizontal plane is also referred to as the horizontal direction. The +X direction side is the front side of the machine tool 10, and the -X direction side is the back side of the machine tool 10.

[0009] The machine tool 10 includes a rotary table device 50 having a rotary table 52 that supports a workpiece 120, a first gripping mechanism 30 and a second gripping mechanism 40 that grip a processing tool for processing the workpiece 120, a cross beam 20 that supports the first gripping mechanism 30 and the second gripping mechanism 40 so that they can slide horizontally, and three columns 12, 13, and 14. The workpiece 120 may be any type, and may be, for example, an outer ring or an inner ring of a bearing used in a wind power generator or the like.

[0010] The columns 12, 14 at both ends are erected on either side of the rotary table 52. The central column 13 is erected on the rear side of the rotary table 52. A cross beam 20 is supported by the three columns 12, 13, 14. The cross beam 20 guides a guide table, which will be described later, in the horizontal direction.

[0011] The cross beam 20 is a member extending in the horizontal direction. An LM (Linear Motion) guide 201, a first horizontal feed device 21, and a second horizontal feed device 22 are fixed to the front side of the cross beam 20. The cross beam 20 guides the first gripping mechanism 30 and the second gripping mechanism 40 in the horizontal direction by the LM guide 201. The first horizontal feed device 21 has a ball screw 211 and a servo motor 212, and feeds the first gripping mechanism 30 in the horizontal direction relative to the cross beam 20. The screw shaft of the ball screw 211 is arranged along the horizontal direction and is connected to the output shaft of the servo motor 212 via a coupling (not shown). The second horizontal feed device 22 as a second feed device has a ball screw 221 and a servo motor 222, and feeds the second gripping mechanism 40 including the second guide table 41 in the horizontal direction relative to the cross beam 20. The screw shaft of the ball screw 221 is disposed along the horizontal direction, and is connected to the output shaft of a servo motor 222 via a coupling (not shown).

[0012] The first gripping mechanism 30 has a first guide table 31, a first vertical feed device 32, a spindle device 34, and a first horizontal slider 36. The first gripping mechanism 30 performs cutting or drilling of the workpiece 120 according to the type of the first processing tool 35 attached to one end side of the spindle device 34. In this embodiment, at least a bit and a drill are interchangeably attached to the spindle device 34 as the first processing tool 35. FIG. 1 shows a state in which a bit is attached as the first processing tool 35. The spindle device 34 can rotate the first processing tool 35 around the axis AX1 by the rotational driving force of the servo motor 341. In the following, the first guide table 31 and the first vertical feed device 32 are also simply referred to as the guide table and the vertical feed device, respectively.

[0013] The first horizontal slider 36, which is circular when viewed from the front, is guided in the horizontal direction by the LM guide 201 on the front side of the cross beam 20. In addition, the first horizontal slider 36 is fixed to a ball screw nut of a ball screw 211. The first guide base 31, which is circular when viewed from the front, is rotatably supported on the front side of the first horizontal slider 36. More specifically, the first guide base 31 rotates relative to the first horizontal slider 36 about the rotation axis RA1 in the direction indicated by the arrow Y1a by the rotational driving force of the servo motor 331.

[0014] A vertical guide base 38 is attached to the front of the first guide base 31, and the vertical guide base 38 guides and supports the vertical feed base 381 in a first guide direction intersecting with the rotation axis of the first guide base 31. The first vertical feed device 32 feeds the vertical feed base 381 in the first guide direction relative to the vertical guide base 38. In this embodiment, the vertical feed base 381 is guided in a direction along the axis AX1 by an LM guide 311 provided on the front side of the vertical guide base 38, and is fed in a direction along the axis AX1 relative to the vertical guide base 38 by the first vertical feed device 32. The first vertical feed device 32 in this embodiment is configured as a ball screw mechanism, and has a ball screw 321 fixed to the vertical guide base 38 and a servo motor 322. The screw shaft of the ball screw 321 is arranged in a direction along the axis AX1 and is connected to the output shaft of the servo motor 322 via a coupling (not shown). A ball screw nut of the ball screw 321 is connected to the vertical feed base 381. In the following, the first guide direction may be simply referred to as the guide direction. A main spindle unit 34 is attached to the front surface of the vertical feed table 381.

[0015] With the configuration of the first gripping mechanism 30 described above, the first guide table 31 in this embodiment is guided horizontally together with the first horizontal slider 36 by the cross beam 20. In addition, the spindle device 34 is rotated together with the first guide table 31 about the rotation axis RA1, whereby the inclination of the spindle device 34 with respect to the Y-axis is adjusted.

[0016] The second gripping mechanism 40 has a second guide table 41 as a guide table, a second vertical feed device 42 as a first feed device, a grindstone device 44, and a second horizontal slider 46. The second gripping mechanism 40 performs special shape processing to process the workpiece 120 into a special shape by grinding the workpiece 120 using a second processing tool 409 attached to a grindstone shaft 420 of the grindstone device 44. In the example shown in FIG. 1, the second processing tool 409 is a grindstone. The grindstone shaft 420 can rotate the second processing tool 409 around the grindstone rotation axis AX2 by transmitting the rotational driving force of the servo motor 471 to the grindstone shaft 420 via the belt 63.

[0017] The second horizontal slider 46, which is circular when viewed from the front, is guided in the horizontal direction by the LM guide 201 on the front side of the cross beam 20, similar to the first horizontal slider 36. The second horizontal slider 46 is fixed to a ball screw nut of a ball screw 221. A second guide base 41, which is circular when viewed from the front, is supported rotatably on the front side of the second horizontal slider 46. More specifically, the second guide base 41 rotates relative to the second horizontal slider 46 about the rotation axis RA2 in the direction indicated by the arrow Y1b by the rotational driving force of the servo motor 431.

[0018] A vertical guide table 48 is attached to the front of the second guide table 41 as a guide table, and the vertical guide table 48 guides and supports a base 70 as a vertical feed table in a second guide direction intersecting with the rotation axis of the second guide table 41. A second vertical feed device 42 as a first feed device feeds the base 70 in the second guide direction relative to the vertical guide table 48. In this embodiment, the base 70 is guided along a direction d1 (vertical direction) perpendicular to the grinding wheel rotation axis AX2 by an LM guide 411 provided on the front side of the vertical guide table 48, and is fed along the direction d1 relative to the vertical guide table 48 by the second vertical feed device 42. The second vertical feed device 42 in this embodiment is configured as a ball screw mechanism, and has a ball screw 421 fixed to the vertical guide table 48 and a servo motor 422. The screw shaft of the ball screw 421 is arranged along the direction d1 and is connected to the output shaft of the servo motor 422 via a coupling (not shown). The ball screw nut of the ball screw 421 is connected to the base 70 .

[0019] Due to the configuration of the second gripping mechanism 40 described above, the second guide table 41 in this embodiment is guided horizontally together with the second horizontal slider 46 by the cross beam 20. The grindstone device 44 is rotated around the rotation axis RA2 together with the second guide table 41, so that the inclination of the grindstone device 44 with respect to the Y-axis is adjusted. As described above, the vertical guide table 48 as a guide table guides and supports the grindstone device 44 in the vertical direction. The second vertical feed device 42 as a first feed device feeds the grindstone device 44 in the vertical direction relative to the vertical guide table 48. The second horizontal feed device 22 as a second feed device feeds the vertical guide table 48 in the horizontal direction relative to the cross beam 20.

[0020] The rotary table device 50 is installed below the spindle device 34 and the grindstone device 44. The rotary table device 50 rotates about a vertical axis line RX. The rotary table device 50 includes a table base 110, a rotary table 52, and a table support device 160.

[0021] The table base 110 is cylindrical and is placed on an installation surface so that its lower surface is in contact with the installation surface. The table support device 160 is placed on the table base 110. The table support device 160 is a hydrostatic bearing that supports the rotary table 52 rotatably about a vertical axis RX along the vertical direction relative to the table base 110. The table support device 160 is provided between the table base 110 and the rotary table 52.

[0022] The rotary table 52 has a table body 53, a chuck 54, and a rotary shaft 180. The table body 53 is disk-shaped. A plurality of chucks 54 are arranged at equal intervals in the circumferential direction of the table body 53. The chucks 54 grip the workpiece 120 placed on the table body 53.

[0023] FIG. 2 is a schematic diagram of the grindstone device 44 as viewed from the front side of the machine tool 10. FIG. 3 is a schematic diagram of the grindstone device 44 as viewed from the left side. FIG. 4 is a schematic diagram of the grindstone device 44 as viewed from the right side. The grindstone device 44 will be described on the assumption that the rotation angle of the second guide table 41 is 0°, that is, the direction in which the ball screw 421 in FIG. 1 extends is the up-down direction, and the grindstone rotation axis AX2 of the grindstone shaft 420 is the horizontal direction. In the standard state, the Z direction is the left-right direction (also called the "width direction") of the grindstone device 44, the X direction is the front-rear direction (also called the "thickness direction") of the grindstone device 44, and the Y direction is the up-down direction of the grindstone device 44. The left-right direction is a direction perpendicular to the up-down direction along the vertical direction and the direction along the horizontal axis AX2. In the standard state, the +X direction side is the front side (front side), and the -X direction side is the rear side (rear side). As another modification, the second guide table 41 and the servo motor 431 may be omitted to eliminate the rotational motion of the second guide table 41. In this case, the ball screw 421 is arranged vertically, and the grinding wheel rotation axis AX2 of the grinding wheel spindle 420 is arranged to be a horizontal axis.

[0024] The grindstone device 44 includes a base 70 (FIGS. 2 and 3) located on the rear side, a grindstone rotation support device 400 (FIG. 2) installed at the bottom of the base 70, and a grindstone rotation drive device 60 (FIG. 2) installed at the top of the base 70. The base 70 is a plate-shaped member extending in the vertical direction. The grindstone device 44 further includes a belt 63 (FIGS. 2 and 3) stretched between the grindstone rotation support device 400 and the grindstone rotation drive device 60, a guide device 520 (FIG. 2) provided between the base 70 and the grindstone rotation drive device 60, a fixing device 90 (FIG. 3) that fixes the grindstone rotation drive device 60 to the base 70, and a support device 80 (FIG. 2) that supports the grindstone rotation drive device 60 from below.

[0025] The grindstone rotation support device 400 has a grindstone shaft 420 (FIGS. 2 to 4) that rotates about a horizontal axis line AX2, a grindstone 409 (FIGS. 2 and 4) attached to one end of the grindstone shaft 420, and a driven pulley 440 (FIG. 3) attached to the other end of the grindstone shaft 420. The driven pulley transmits rotation to the grindstone shaft 420. A part of the grindstone 409 is covered by a grindstone cover 430 provided in the grindstone rotation support device 400 shown in FIG.

[0026] 2, the grindstone rotation drive device 60 is installed above the grindstone rotation support device 400. The grindstone rotation drive device 60 has a rotation drive motor 61 having a drive shaft 62, and a drive pulley 65 attached to the drive shaft 62. The drive shaft 62 is driven to rotate about a horizontal axis line AXb by the power of the rotation drive motor 61.

[0027] As shown in FIG. 3, the belt 63 is stretched around the driven pulley 440 and the driving pulley 65. The belt 63 transmits the power of the driving pulley 65, which rotates in response to the rotation of the drive shaft 62, to the driven pulley 440. The tension of the belt 63 is adjusted to a target value so that the power can be transmitted appropriately. This tension adjustment is performed by moving the grindstone rotation driving device 60 in the vertical direction (Y direction) using the support device 80. The method of adjusting the tension will be described in detail later. The driven pulley 440 and the driving pulley 65 are covered by a pulley cover 69.

[0028] 3 fixes the grindstone rotation drive device 60 at any position in the vertical direction relative to the base 70. The fixing device 90 will be described in detail later.

[0029] 5 is a perspective view of the upper side of the grindstone device 44. In the left-right direction (Z direction), one end of the base 70 on the +Z direction side is called one-side end 70a, and the other end on the -Z direction side is called the other-side end 70b.

[0030] The grindstone rotation drive device 60 further includes a motor base 66 to which the rotation drive motor 61 is fixed. The motor base 66 fixes the rotation drive motor 61 with fastening members 681 and 682. In the left-right direction, one end of the motor base 66 on the +Z direction side is called one-side end 66a, and the other end on the -Z direction side is called the other-side end 66b. The fastening members 681 and 682 are a bolt and a nut, respectively. The motor base 66 is a plate-shaped member and is installed between the base 70 and the rotation drive motor 61. The motor base 66 is guided in the up-down direction by the guide device 520 in a state in which the lock of the fixing device 90 by a lock member 92 described later is released. The details of the motor base 66 will be described later.

[0031] The fixing device 90 is disposed on the other end portion 70b side of the base 70. The fixing device 90 has a pair of holding members 94 disposed at an interval in the vertical direction, and a locking member 92 inserted through each of the pair of holding members 94.

[0032] The pair of holding members 94 sandwich the other end 70b of the base 70 and the other end 66b of the motor base 66 in the front-rear direction. This sandwiching force restricts the movement of the motor base 66 in the up-down direction, and the motor base 66 is fixed at any position in the up-down direction relative to the base 70.

[0033] The locking member 92 is inserted into the insertion hole of the holding member 94. The locking member 92 is a screw having a threaded portion formed on the tip side. The locking member 92 is inserted into the insertion hole 94h of the holding member 94, and the threaded portion at the tip of the locking member 92 is screwed into a threaded portion 92s formed on the base 70.

[0034] Fig. 6 is a cross-sectional view in the XZ plane of the grindstone device 44 near the locking member 92 and the pressing member 94. As shown in Fig. 6, the locking member 92 has a small-diameter screw portion 92s located at the front end side and a large-diameter head portion 92t located at the rear end side, the head portion 92t having a hexagonal cross section. A step portion 92d formed at the boundary between the screw portion 92s and the head portion 92t presses the pressing member 94, via a washer 93, against the side where the base 70 and the motor base 66 are located.

[0035] As shown in FIG. 6, the pressing member 94 has a first pressing surface 94fs, a second pressing surface 94ft, a pressed surface 94fu, and an insertion hole 94h. The first pressing surface 94fs is a surface parallel to the vertical direction and is in surface contact with a motor base side surface 66fs, which is a side surface of the motor base 66. The motor base side surface 66fs is a side surface of the motor base 66 on the other end 66b side. The second pressing surface 94ft is a surface parallel to the vertical direction and is in surface contact with a base side surface 70ft, which is a side surface of the base 70. The base side surface 70ft is a side surface of the base 70 on the other end 70b side. The pressed surface 94fu is a surface parallel to the vertical direction and faces the step portion 92d in the left-right direction across the washer 93.

[0036] The first clamping surface 94fs and the second clamping surface 94ft are each inclined in the left-right direction so as to apply external forces F1, F2 to the base 70 and the motor base 66 in a direction that sandwiches the base 70 and the motor base 66 when the clamping member 94 is pressed against the base 70 and the motor base 66 by the locking member 92.

[0037] When changing the vertical position of the grindstone rotation drive device 60, the lock member 92 is rotated about its axis to displace it to the side opposite to the side where the base 70 is located, and the screw is loosened. This causes the first clamping surface 94fs and the second clamping surface 94ft of the clamping member 94 to move apart, thereby releasing the fixation of the motor base 66 to the base 70. This state in which the fixation is released is called an unlocked state. In the unlocked state, the grindstone rotation drive device 60 is moved up and down by the support device 80, thereby changing the vertical position of the grindstone rotation drive device 60.

[0038] 5, the grindstone device 44 further has a tipping prevention member 320 disposed on the side where the other end portion 70b and the other end portion 66b are located. The tipping prevention member 320, in combination with the second guide surface 70fb, prevents the motor base 66 from tipping in the direction of the arrow RD when the fixing device 90 is in the unlocked state.

[0039] As shown in FIG. 5, the anti-tip member 320 is disposed near the upper portion of the base 70. The anti-tip member 320 has a first wall 324 having an insertion hole through which a screw 328 is inserted, and a second wall 326 intersecting the first wall 324. The second wall 326 faces the other end 70b of the base 70 across the other end 66b of the motor base 66. The anti-tip member 320 is detachably fixed to the base 70 by inserting the screws 328 into the three insertion holes of the first wall 324 and screwing them into the base 70. On the other hand, when the screws 328 are removed, the anti-tip member 320 can be removed from the base 70. When the anti-tip member 320 is removed from the base 70, the motor base 66 can be detached from the base 70.

[0040] 6, the second wall 326 has a third guide surface 326fc. The third guide surface 326fc is located on the other end 70b side of the base 70. The third guide surface 326fc is parallel to the vertical axis RX (axis along the up-down direction). The third guide surface 326fc faces the base 70 with the motor base 66 in between.

[0041] The motor base 66 has a third guided surface 66fc facing the third guide surface 326fc so as to be able to come into surface contact with the third guiding surface 326fc.

[0042] The third guiding surface 326fc comes into surface contact with the third guided surface 66fc, thereby restricting the movement of the motor base 66 in the direction of the arrow RD (FIG. 5), and inhibiting the motor base 66 from moving away from the base 70.

[0043] Next, components of the guide device 520 will be further described with reference to Fig. 5. The base 70 has a first guide surface 70fa and a second guide surface 70fb intersecting the first guide surface 70fa. The first guide surface 70fa and the second guide surface 70fb are each formed parallel to the vertical axis RX.

[0044] The first guide surface 70fa is a surface of the base 70 on the side where the rotary drive motor 61 is located. As shown in FIG. 5 and FIG. 6, the first guide surface 70fa is formed from the one side end 70a to the other side end 70b. As shown in FIG. 5, the base 70 is formed with a protruding portion 70p that protrudes from the one side end 70a side to the front side (+X direction side) where the rotary drive motor 61 is located, and a second guide surface 70fb is formed on the motor base 66 side of the protruding portion 70p. The second guide surface 70fb is inclined with respect to the first guide surface 70fa so as to form an acute angle with the first guide surface 70fa. In addition, the second guide surface 70fb faces the first guide surface 70fa in the front-rear direction (X direction). The one side end 66a of the motor base 66 enters into an area Rg1 sandwiched between the first guide surface 70fa and the second guide surface 70fb.

[0045] 5, the motor base 66 has a first guided surface 66fa and a second guided surface 66fb at one side end 66a. The first guided surface 66fa is in surface contact with the first guide surface 70fa. The second guided surface 66fb is in surface contact with the second guide surface 70fb. Here, the first guide surface 70fa, the second guide surface 70fb, the first guided surface 66fa, and the second guided surface 66fb are components of the guide device 520.

[0046] In the unlocked state, the motor base 66 is sandwiched in the left-right direction by the protrusion 70p and the pair of holding members 94, and the motor base 66 is pressed against the base 70. This restricts the horizontal movement of the motor base 66 relative to the base 70, specifically the left-right movement. In addition, in the unlocked state, one side end 66a of the motor base 66 is sandwiched in the front-rear direction by the second guide surface 70fb and the first guide surface 70fa shown in FIG. 5. In addition, the other side end 66b of the motor base 66 is sandwiched in the front-rear direction by the third guide surface 326fc and the first guide surface 70fa shown in FIG. 6. This restricts the horizontal movement of the motor base 66 relative to the base 70, specifically the front-rear movement. On the other hand, in the unlocked state, the first guide surface 70fa, the second guide surface 70fb, and the third guide surface 326fc are parallel to the vertical axis RX, so that the motor base 66 can be guided in the up-down direction. Since the rotary drive motor 61 is fixed to the motor base 66, the rotary drive motor 61 is also immobilized in the horizontal direction and is guided in the vertical direction by the guide device 520.

[0047] Fig. 7 is a view of the grindstone device 44, showing an area including the support device 80, as seen from the front side. Fig. 8 is a cross-sectional view taken along line VIII-VIII in Fig. 7. The pair of walls 724, 744 shown in Fig. 7 are plate-shaped and spaced apart in the left-right direction. As described above, the pair of walls 724, 744 are fixed to the base 70 by bolts or the like in a manner that protrudes from the middle portion of the base 70 toward the front side (+X direction side).

[0048] As shown in Figs. 7 and 8, the grindstone rotation drive device 60 further includes a triangular base 82 installed below the motor base 66. The triangular base 82 includes a first contact surface 82fp that is in surface contact with a second contact surface 66fp that is the lower surface of the motor base 66, a first abutted surface 82fa, and a second abutted surface 82fb. The first contact surface 82fp forms the upper surface of the triangular base 82 that is located on the motor base 66 side. The first contact surface 82fp extends in the left-right direction. In this embodiment, the left-right direction is a direction along a horizontal axis AXp of a screw shaft 84, which will be described later.

[0049] The first abutted surface 82fa is a surface connected to one end of the first contact surface 82fp in the left-right direction. The first abutted surface 82fa is inclined with respect to the vertical axis RX. Specifically, the first abutted surface 82fa is inclined to be located lower in the left-right direction from one end (end in the +Z direction) of the grindstone device 44 to the other end (end in the -Z direction).

[0050] The second abutted surface 82fb is a surface connected to the other end of the first contact surface 82fp in the left-right direction. The second abutted surface 82fb is inclined in the opposite direction to the first abutted surface 82fa with respect to the vertical axis RX. Specifically, the second abutted surface 82fb is inclined in the left-right direction from the other end side (-Z direction end) of the grindstone device to one end side (+ direction end) so as to be positioned lower. When the grindstone device 44 is viewed from the front side, the first abutted surface 82fa and the second abutted surface 82fb are inclined in opposite directions but have the same inclination angle.

[0051] As shown in Fig. 8, the second abutted surface 82fb has a through hole 82h penetrating in the vertical direction and reaching the first contact surface 82fp. The first abutted surface 82fa also has a through hole 82h penetrating in the vertical direction and reaching the first contact surface 82fp. The triangular base 82 is fixed to the motor base 66 by inserting a hexagonal socket bolt 842 into these two through holes 82h and screwing them into the motor base 66. As another modification, the triangular base 82 and the motor base 66 may be integrally formed.

[0052] 7, the support device 80 has a bridge member 88, a screw shaft 84 along a horizontal axis line AXp, and a restricting guide member 87. Two bridge members 88 are arranged at an interval in the left-right direction. When the two bridge members 88 are used separately, they are called a first bridge member 88A and a second bridge member 88B.

[0053] As shown in Fig. 7, the screw shaft 84 has one screw end 84a, the other screw end 84b, a screw portion 84c connecting the one screw end 84a and the other screw end 84b, and a head portion 85 disposed at the other screw end 84b. The head portion 85 has a hexagonal cross section. The one screw end 84a is inserted into a through hole formed in the wall portion 744, and a portion of the one screw end 84a protrudes from the wall portion 744. A cap member 86 that restricts the axial movement of the screw shaft 84 is disposed on the outer periphery of the one screw end 84a.

[0054] By rotating the head 85 about the horizontal axis AXp with a tool such as a wrench, the screw shaft 84 rotates about the horizontal axis AXp. In this embodiment, the head 85 and the other end 84b of the screw may be separate members or may be an integrated member.

[0055] The screw portion 84c functions as a feed screw. As shown in Fig. 7, the screw portion 84c has a male screw (not shown) formed on the outer periphery of a cylinder. The screw portion 84c has a first screw portion 84ca formed between a central portion 84cp in the left-right direction and one screw end portion 84a, and a second screw portion 84cb formed between the central portion 84cp and the other screw end portion 84b.

[0056] The first screw portion 84ca screws into the first piece member 88A. The second screw portion 84cb screws into the second piece member 88B. The second screw portion 84cb has a reverse screw relationship with the first screw portion 84ca. In other words, the direction of the male thread of the first screw portion 84ca and the direction of the male thread of the second screw portion 84cb are opposite to each other. When the head portion 85 is rotated and the screw shaft 84 is rotated in one direction around the horizontal axis line AXp, the first piece member 88A and the second piece member 88B move in a direction approaching each other. On the other hand, when the head portion 85 is rotated and the screw shaft 84 is rotated in the other direction around the horizontal axis line AXp, the first piece member 88A and the second piece member 88B move so as to move away from each other.

[0057] 8, the bridge member 88 has a first member 801, a second member 89, and a nut 819. The second member 89 of the first bridge member 88A and the second member 89 of the second bridge member 88B have the same shape but differ in orientation. In the first bridge member 88A, the first member 801 is also referred to as the first bridge member 801A, and the second member 89 is also referred to as the second member 89A. In the second bridge member 88B, the first member 801 is also referred to as the first member 801B, and the second member 89 is also referred to as the second member 89B.

[0058] 8, two through holes 810ha and 810hb are formed in the first member 801, penetrating from the front surface to the rear surface, and screws 813 and 814 are inserted into the through holes 810ha and 810hb, respectively. The first member 801 and the second member 89 are fixed together by the two screws 813 and 814.

[0059] As shown in FIG. 8, the nut 819 is disposed inside the first member 801. The nut 819 has a female thread formed on its inner circumferential surface. An insertion hole 810hc is formed on the front surface of the first member 801. A rotation prevention member 812 that prevents the nut 819A from rotating is inserted into the insertion hole 810hc. The rotation prevention member 812 is, for example, a pin or a screw. The tip of the rotation prevention member 812 fits into a groove 819a formed on the outer circumferential surface of the nut 819 to prevent the nut 819A from rotating. The first member 801 has sidewalls 801r that sandwich the nut 819 from both sides in the direction along the screw shaft 84. The sidewalls 801r can prevent the nut 819 from tilting. When the nut 819 moves along the horizontal axis AXp due to rotation of the screw shaft 84, the first member 801 is pushed by the nut 819 and moves along the horizontal axis AXp in conjunction with the nut 819. In addition, the second member 89 is fixed to the first member 801 by screws 813 and 814, and therefore moves along the horizontal axis AXp in conjunction with the first member 801.

[0060] As shown in FIG. 7, the second member 89A of the first piece member 88A has a first abutment surface 89Afa that faces the first abutment surface 82fa in the up-down direction and the left-right direction and is in surface contact with the first abutment surface 82fa. The first abutment surface 89Afa forms the upper surface of the second member 89A. The first abutment surface 89Afa is inclined with respect to the vertical axis RX in correspondence with the first abutment surface 82fa. The second member 89B of the second piece member 88B has a second abutment surface 89Afb that faces the second abutment surface 82Afb in the up-down direction and the left-right direction and is in surface contact with the second abutment surface 82Afb. The second abutment surface 89Afb forms the upper surface of the second member 89B. The second abutment surface 89Afb is inclined with respect to the vertical axis RX in correspondence with the second abutment surface 82fb. The first contact surface 89Afa and the second contact surface 89Afb support the triangular base 82 from below in the left-right direction so as to sandwich the triangular base 82 therebetween.

[0061] The restricting guide member 87 is disposed below the bridge member 88. The restricting guide member 87 has insertion holes through which four hexagon socket head bolts 873 aligned along the horizontal axis AXp are inserted. The restricting guide member 87 is fixed to the base 70 by the four hexagon socket head bolts 873 that penetrate the restricting guide member 87 and are screwed into the base 70. As shown in FIG. 8, the restricting guide member 87 has a support surface 87fb that abuts against a lower surface 89fb of the second member 89 of the bridge member 88, and a restricting wall 87a that rises upward from the support surface 87fb. The support surface 87fb bears the weight of the bridge member 88, the triangular base 82, and the motor base 66. The restricting wall 87a faces the base 70 with a gap therebetween in the front-rear direction. A concave support groove 87ca is defined by the restricting wall 87a, the support surface 87fb, and the base 70. The support groove 87ca extends along the horizontal axis AXp. A lower end of the bridge member 88 fits into the support groove 87ca. The movement of the bridge member 88 in the front-rear direction is restricted by the restricting wall 87a that defines the concave support groove 87ca and the base 70. On the other hand, the movement of the bridge member 88 along the horizontal axis AXp is guided along the support groove 87ca.

[0062] 9 is a diagram for explaining a method of adjusting the tension of the belt 63 by the support device 80. In the grindstone device 44, for example, when the type of the grindstone 409 is replaced, the tension of the belt 63 is adjusted to match the grindstone 409. The tension of the belt 63 is adjusted by first setting the rotation angle of the second guide table 41 at 0°, that is, setting the reference state in which the direction in which the ball screw 421 in FIG. 1 extends is the vertical direction and the grindstone rotation axis AX2 of the grindstone shaft 420 is horizontal. Next, the adjustment is performed in a state in which the lock by the lock member 92 shown in FIG. 5 is released and the motor base 66 can move vertically relative to the base 70.

[0063] As shown in Fig. 9, when the screw shaft 84 rotates in one direction around the horizontal axis line AXp, the first piece member 88A and the second piece member 88B move in a direction away from each other. As a result, the first contact surface 89Afa and the second contact surface 89Afb move in a direction away from each other. In other words, the support device 80 moves the first contact surface 89Afa away from the first contacted surface 82fa in the left-right direction along the horizontal axis line AXp. Also, the support device 80 moves the second contact surface 89Afb away from the second contacted surface 82fb in the left-right direction along the horizontal axis line AXp. As a result, the left-right distance between the first contact surface 89Afa and the second contact surface 89Afb becomes larger, and the first contacted surface 82fa slides on the first contact surface 89Afa and the second contacted surface 82fb slides on the second contact surface 89Afb due to the weight of the triangular base 82, and the grindstone rotation driving device 60 including the triangular base 82 moves downward. As a result, the distance between the driving pulley 65 and the driven pulley 440 shown in Figure 3 becomes shorter, and the tension can be reduced.

[0064] On the other hand, as shown in Fig. 9, when the screw shaft 84 rotates in the other direction (opposite to the one direction) around the horizontal axis line AXp, the first piece member 88A and the second piece member 88B move in a direction approaching each other. As a result, the first contact surface 89Afa and the second contact surface 89Afb move in a direction approaching each other. In other words, the support device 80 moves the first contact surface 89Afa so as to approach the first contacted surface 82fa in the left-right direction along the horizontal axis line AXp. Also, the support device 80 moves the second contact surface 89Afb in a direction approaching the second contacted surface 82fb in the left-right direction along the horizontal axis line AXp. As a result, the left-right distance between the first abutment surface 89Afa and the second abutment surface 89Afb becomes smaller, and the triangular base 82 is lifted by the piece member 88, so that the first abutted surface 82fa slides on the first abutment surface 89Afa and the second abutted surface 82fb slides on the second abutment surface 89Afb. As a result, the grindstone rotation drive device 60 including the triangular base 82 moves upward. The upward movement of the grindstone rotation drive device 60 also moves the motor base 66 and the rotation drive motor 61 (FIG. 5) fixed to the motor base 66 upward. As a result, the distance between the drive pulley 65 and the driven pulley 440 shown in FIG. 3 becomes longer, and the tension can be increased.

[0065] As described above, the support device 80 of this embodiment is configured so that the first piece member 88A and the second piece member 88B can be moved closer to or farther away from each other along the horizontal axis line AXp by rotating the screw shaft 84, thereby moving the grindstone rotation drive device 60 in the vertical direction and adjusting the tension of the belt 63.

[0066] 11, the grindstone rotation drive device 60 can be stably supported from below by surface contact with the first contact surface 89Afa and the second contact surface 89Afb of the support device 80. Also, according to the embodiment, the grindstone rotation drive device 60 can be moved in the vertical direction by the support device 80 to adjust the tension of the belt 63.

[0067] According to the above embodiment, as shown in Fig. 9, the grindstone rotation drive device 60 is sandwiched between the first piece member 88A and the second piece member 88B in the left-right direction along the horizontal axis line AXp in the horizontal direction, so that the grindstone rotation drive device can be prevented from moving in the horizontal direction, specifically, in the left-right direction. According to the above embodiment, the grindstone rotation drive device 60 can be easily moved in the up-down direction by the first piece member 88A and the second piece member 88B. As another modification, the grindstone rotation drive device 60 may be moved in the up-down direction by only one of the first piece member 88A and the second piece member 88B.

[0068] In the above embodiment, the motor base 66 and the triangular base 82 may be fixed with a screw 842 (FIG. 11) so as to allow slight movement relative to each other in the horizontal direction, specifically, in the left-right direction along the horizontal axis line AXp. For example, the inner diameter of the hole of the triangular base 82 through which the screw 842 passes is made slightly larger than the diameter of the screw 842. In this way, even if the triangular base 82 moves slightly in the horizontal direction, specifically, in the left-right direction, due to the first piece member 88A and the second piece member 88B, the first contact surface 82fp and the second contact surface 66fp slide against each other to absorb the slight movement, thereby preventing the slight movement from being transmitted to the motor base 66.

[0069] 5 prevents the motor base 66 from moving away from the base 70, and therefore prevents the grindstone rotation drive device 60 fixed to the motor base 66 from tipping over due to its own weight. When the tipping prevention member 320 is detached from the base 70, the grindstone rotation drive device 60 can be detached from the base 70.

[0070] Furthermore, according to the above embodiment, the grindstone rotation drive device 60 including the motor base 66 can be fixed to the base 70 by applying external forces F1 and F2 to the base 70 and the motor base 66 in a direction in which the base 70 and the motor base 66 are sandwiched between the first clamping surface 94fs and the second clamping surface 94fs shown in Figure 7.

[0071] Furthermore, according to the above embodiment, as shown in FIG. 1, the grindstone device 44 can be moved vertically and horizontally to machine the workpiece 120 on the rotary table device 50.

[0072] B. Other embodiments: B-1. Alternative embodiment 1: 10 is a schematic diagram for explaining a grindstone device 144 of another embodiment 1. The difference between the grindstone device 144 and the grindstone device 44 of the first embodiment is that the grindstone device 144 has a regulating structure 510. Other configurations of the grindstone device 144 are similar to those of the grindstone device 44 of the first embodiment, so they are denoted by the same reference numerals and description thereof will be omitted as appropriate.

[0073] Of the restriction structures 510, the structure that restricts the movement of the first piece member 88A is called the first restriction structure 510A, and the structure that restricts the movement of the second piece member 88B is called the second restriction structure 510B. The first restriction structure 510A restricts the movement of the second member 89A of the first piece member 88A in a predetermined restriction direction perpendicular to the up-down direction relative to the triangular base 82. The restriction direction is the front-rear direction (X direction) perpendicular to the up-down direction and the left-right direction. The second piece member 88B restricts the movement of the second member 89B of the second piece member 88B in the restriction direction relative to the triangular base 82.

[0074] The first restricting structure 510A has a first convex portion 512A formed on the first abutment surface 89Afa of the second member 89A. The shape of the first convex portion 512A is arbitrary, and may be a prism shape or a cylinder shape. The first restricting structure 510A also has a first groove portion 516A formed on the first abutment surface 82fa of the triangular base 82. The first groove portion 516A is formed along the first inclined direction in which the first abutment surface 82fa extends. The first convex portion 512A fits into the first groove portion 516A. This makes it possible to prevent the first piece member 88A from falling off the triangular base 82 while guiding the movement of the first abutment surface 82fa in the sliding direction (first inclined direction) toward the first abutment surface 82fa when the first abutment surface 82fa slides on the first abutment surface 89Afa.

[0075] The second restricting structure 510B has a second convex portion 512B formed on the second abutment surface 89Afb of the second member 89B. The shape of the second convex portion 512B is arbitrary, and may be a prism shape or a cylinder shape. The second restricting structure 510B also has a second groove portion 516B formed on the second abutment surface 82fb of the triangular base 82. The second groove portion 516B is formed along the second inclined direction in which the second abutment surface 82fb extends. The second convex portion 512B fits into the second groove portion 516B. This makes it possible to prevent the second piece member 88B from falling off the triangular base 82 while guiding the movement of the second abutment surface 82fb in the sliding direction (second inclined direction) toward the second abutment surface 82fb when the second abutment surface 82fb slides on the second abutment surface 89Afb.

[0076] Instead of the above-mentioned other embodiment 1, the first groove portion 516A may be formed in the first contact surface 89Afa, and the first convex portion 512A may be formed in the first contacted surface 82fa. Also, instead of the above-mentioned other embodiment 1, the second groove portion 516B may be formed in the second contact surface 89Afb, and the second convex portion 512B may be formed in the second contacted surface 82fb. Even in this case, the same effect as the above-mentioned other embodiment 1 is obtained.

[0077] B-2. Alternative embodiment 2: In the above embodiment, as shown in Fig. 9, the first contact surface 89Afa and the first contacted surface 82fa, and the second contact surface 89Afb and the second contacted surface 89Afb are in direct surface contact, but they may be indirectly in surface contact with other elements therebetween. For example, a resin sheet for preventing the first contact surface 89Afa and the first contacted surface 82fa from sticking to each other may be disposed on at least one of the first contact surface 89Afa and the first contacted surface 82fa. Similarly, a resin sheet for preventing the second contact surface 89Afb and the second contacted surface 82fb from sticking to each other may be disposed on at least one of the second contact surface 89Afb and the second contacted surface 82fb.

[0078] The present disclosure is not limited to the above-mentioned embodiment, and can be realized in various configurations without departing from the spirit of the present disclosure. For example, the technical features of the embodiments corresponding to the technical features in each aspect described in the Summary of the Invention can be appropriately replaced or combined to solve some or all of the above-mentioned problems or to achieve some or all of the above-mentioned effects. Furthermore, if a technical feature is not described as essential in this specification, it can be appropriately deleted. [Explanation of symbols]

[0079] 10...machine tool, 12...column, 13...column, 20...cross beam, 21...first horizontal feed device, 22...second horizontal feed device, 30...first gripping mechanism, 31...first guide table, 32...first vertical feed device, 34...spindle device, 35...first processing tool, 36...first horizontal slider, 38...vertical guide table, 40...second gripping mechanism, 41...second guide table, 42...second vertical feed device, 44...grinding wheel device, 46...second horizontal slider, 48...vertical guide table, 50...rotary table device, 52 ...rotary table, 53...table body, 54...chuck, 60...grindstone rotation drive device, 61...rotary drive motor, 62...drive shaft, 63...belt, 65...drive pulley, 66...motor base, 66a...one side end, 66b...other side end, 66fa...first guided surface, 66fb...second guided surface, 66fc...third guided surface, 66fd...fourth guided surface, 66fp...second contact surface, 66fs...motor base side, 69...pulley cover, 70...base, 70a ...One side end, 70b...Other side end, 70fa...First guide surface, 70fb...Second guide surface, 70ft...Base side surface, 70p...Protrusion, 80...Support device, 82...Triangular base, 82Afb...Second abutment surface, 82fa...First abutment surface, 82fb...Second abutment surface, 82fp...First contact surface, 82h...Through hole, 84...Screw shaft, 84a...One end of screw, 84b...Other end of screw, 84c...Screw portion, 84ca...First screw portion, 84cb...Second screw portion, 84cp...Center portion, 84q...step, 84r...step, 85...head, 86...cap member, 87...regulating guide member, 87a...regulating wall, 87ca...support groove, 87fb...support surface, 88...bridge member, 88A...first bridge member, 88B...second bridge member, 89...second member, 89Afa...first abutment surface, 89Afb...second abutment surface, 89fb...lower surface, 90...fixing device, 92,92a,92b...lock member, 92d...step portion, 92s...screw portion, 92t...head, 93...washer, 94,94a,94b...pressing member, 94fs...first pressing surface, 94ft...second pressing surface, 94fu...pressed surface, 94h...insertion hole, 110...table base, 120...workpiece, 144...grinding device, 160...table support device, 180...rotating shaft, 201...LM guide, 211...ball screw, 212...servo motor, 221...ball screw, 222...servo motor, 311...LM guide, 320...protection Stop member, 321...ball screw, 322...servo motor, 324...first wall, 326...second wall, 326fc...third guide surface, 328...screw, 331...servo motor, 341...servo motor, 381...upper and lower feed tables, 400...grindstone rotation support device, 409...grindstone (second processing tool), 411...LM guide, 420...grindstone shaft, 421...ball screw, 422...servo motor, 430...grindstone cover , 431... servo motor, 440... driven pulley, 471... servo motor, 510... restriction structure, 510A... first restriction structure, 510B... second restriction structure, 512A... first convex portion, 512B... second convex portion, 516A... first groove portion, 516B... second groove portion, 520... guide device, 681... fastening member, 724... wall portion, 742... wall portion, 744... wall portion, 801... first member, 810ha... first through hole, 8 10hb...second through hole, 810hc...insertion hole, 812...anti-rotation member, 813...screw, 819...nut, 819a...groove, 842...hexagon socket bolt, 873...hexagon socket bolt, 874...bush, AX1...axis, AX2...grindstone rotation axis, AXp...horizontal axis, F1...first external force, F2...second external force, RA1, RA2...rotation axis, RX...vertical axis, Rg1...area, d1...vertical direction,

Claims

1. A grinding device comprising: A base extending vertically; a grindstone rotation support device including a grindstone spindle that rotates about a horizontal axis, a grindstone attached to one end of the grindstone spindle, and a driven pulley attached to the other end of the grindstone spindle; a grindstone rotation drive device installed above the grindstone rotation support device, the grindstone rotation drive device having a drive shaft that is driven to rotate about a horizontal axis and a drive pulley attached to the drive shaft; a belt stretched across the driven pulley and the driving pulley; a guide device provided between the base and the grindstone rotation drive device, the guide device preventing the grindstone rotation drive device from moving in a horizontal direction relative to the base and guiding the grindstone rotation drive device in an up-down direction along the vertical direction; a fixing device that fixes the grindstone rotation drive device to the base at an arbitrary position in the vertical direction; a support device that supports the grindstone rotation drive device from below, The grindstone rotation drive device has a contact surface inclined with respect to a vertical axis, The support device includes: a bridge member having an abutting surface that faces the abutted surface and comes into surface contact with the abutted surface; a screw shaft having a screw portion that screws into the bridge member and rotates about a horizontal axis, The support device is configured to rotate the screw shaft to move the abutment surface toward or away from the abutted surface, thereby moving the grinding wheel rotation drive device in the vertical direction to adjust the tension of the belt.

2. The grinding device according to claim 1, The bridge member is a first bridge member, The abutment surface is a first abutment surface, the threaded portion is a first threaded portion, The abutted surface is a first abutted surface, The grindstone rotation drive device further includes a second abutted surface inclined in a direction opposite to the first abutted surface with respect to the vertical axis, The threaded portion includes the first threaded portion and a second threaded portion having a reverse thread to the first threaded portion, the support device further includes a second piece member having a second abutting surface that faces the second abutted surface and comes into surface contact with the second abutted surface, The support device is configured to rotate the screw shaft to move the first piece member and the second piece member closer to or farther apart, thereby moving the grindstone rotation drive device in the vertical direction and adjusting the tension of the belt.

3. The grinding device according to claim 2, The grindstone rotation drive device further includes: a rotary drive motor having the drive shaft; a motor base for fixing the rotary drive motor, the motor base being guided in the up-down direction by the guide device; a triangular base disposed below the motor base, the triangular base having the first abutment surface and the second abutment surface; The triangular base further includes a first contact surface that contacts the motor base, the motor base further has a second contact surface in surface contact with the first contact surface, The first contact surface and the second contact surface are configured to allow movement relative to each other in the horizontal direction.

4. The grinding device according to claim 3, further comprising: a first restriction structure that restricts movement of the first piece member relative to the triangular base in a predetermined restriction direction perpendicular to the up-down direction; a second restriction structure that restricts the movement of the second piece member relative to the triangular base in the restriction direction, The first restriction structure is a first protrusion formed on one of the first contact surface and the first contacted surface; a first groove portion formed on the other of the first contact surface and the first contacted surface, into which the first protrusion is inserted, the first groove portion extending along a first inclination direction in which the first contacted surface is inclined; The second restriction structure is a second protrusion formed on one of the second contact surface and the second contacted surface; a second groove portion formed on the other of the second abutment surface and the second abutted surface, into which the second convex portion fits, the second groove portion extending along a second inclination direction in which the second abutted surface is inclined.

5. The grinding device according to claim 3, The guiding device is a first guide surface formed on the base, the first guide surface being parallel to the vertical axis; a first guided surface formed on the motor base and in surface contact with the first guide surface; a second guide surface that protrudes from one end of the base in the left-right direction toward a front side where the rotation drive motor is located, the second guide surface being parallel to the vertical axis, inclined with respect to the first guide surface, and facing the first guide surface; a second guided surface formed on the motor base and in surface contact with the second guide surface; a third guide surface located on the other end side of the base in the left-right direction, the third guide surface being parallel to the vertical axis and facing the base with the motor base in between; a third guided surface formed on the motor base and facing the third guide surface so as to be capable of surface contact with the third guide surface, the third guide surface is formed on a tipping prevention member that is detachably fixed to the base and prevents the motor base from moving away from the base, The grinding wheel device, wherein the motor base is configured so as to be detachable from the base when the tipping prevention member is detached from the base.

6. The grinding device according to claim 3, The fixing device comprises: a pair of holding members disposed at one end and the other end of the base in a left-right direction on the other end side with a gap therebetween in the up-down direction; a locking member inserted through each of the pair of holding members, the locking member being screwed into the base while pressing each of the holding members against the base and the motor base; The holding member is a first holding surface that is parallel to the vertical direction and that is in surface contact with a motor base side surface that is a side surface of the motor base; A second clamping surface that is parallel to the vertical direction and is in surface contact with a base side surface that is a side surface of the base, A grinding device, wherein the first clamping surface and the second clamping surface are inclined with respect to the left-right direction so as to apply an external force to the base and the motor base in a direction that sandwiches the base and the motor base when the clamping member is pressed against the base and the motor base.

7. A machine tool, The grinding device according to any one of claims 1 to 6, A guide table that guides and supports the grindstone device in the vertical direction; a first feed device that feeds the grindstone device in the up-down direction relative to the guide table; A cross beam that guides the guide table in a horizontal direction; A second feed device that feeds the guide table in the horizontal direction relative to the crossbeam; a rotary table device disposed below the grinding wheel device and configured to rotate about a vertical axis.

Images