JP2015075179A - Rotary device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary device capable of, when providing a clamp mechanism on the rotary device, increasing a plate diameter of the clamp mechanism as large as possible without reducing a piston diameter.SOLUTION: A second bearing 50 is placed on a main shaft 2 between a pinion gear 23 and a clamp mechanism 100, and therefore, an axial distance by the placement of the second bearing 50 can be secured between the pinion gear 23 and the clamp mechanism 100. Accordingly, pistons 6 and 7 and the clamp mechanism 100 can be laid out by effectively using the axial distance by the placement of the second bearing 50 so that the plate diameter of a clamp plate 102 of the clamp mechanism 100 can be increased without reducing the diameter of the first piston 6 and the second piston 7.

Description

  The present invention relates to a rotating device such as a rotary actuator that is attached to a machine tool or the like to rotate and fix and hold a workpiece.

  Conventionally, a rotating device called a rotary actuator disclosed in Patent Document 1 and Patent Document 2 below is known. In these rotating devices, a pinion gear is provided at an intermediate portion of a main shaft (spindle) that holds and holds a workpiece at one end, and a piston having a rack gear meshing with the pinion gear is moved in a direction orthogonal to the main shaft axial direction. Thus, the main shaft is configured to rotate from 0 degrees to 90 degrees or 180 degrees.

  In this rotating device, when the workpiece is processed at each angular position (0 degree, 90 degrees, or 180 degrees), the main shaft is fixed and the work is fixedly held by continuously applying the operating pressure to the piston. I am doing so. That is, by continuing to apply operating pressure to the piston, the pinion gear of the main shaft is pressed from the rack gear of the piston, the movement of the main shaft in the rotational direction is suppressed, and the rotational position is fixedly held.

  On the other hand, an “indexing table” that can finely adjust the holding angle of the workpiece is also known from Patent Document 3 below.

Japanese Patent No. 3469525 Japanese Patent No. 3755072 Japanese Patent No. 4328060

  By the way, when a workpiece is machined or the like, loads and impacts are applied from various directions, so it is necessary to fix the main shaft more firmly. It was not enough to fix the rotational position of the main shaft on the meshing surface of the pinion gear. That is, a sufficient holding force cannot be obtained with respect to the axial displacement of the main shaft or the movement in the shaft collapse direction.

  Therefore, it is conceivable to employ a “clamp mechanism” used in the indexing table described in Patent Document 3 to fix the movement of the main shaft. This “clamp mechanism” is a clutch plate called a clamp plate that is integrated with the main shaft between the main shaft and the body (main body) and presses the clamp plate toward the body side with the piston. The shaft is integrated with the body.

  Here, the indexing table is generally provided with a clamp mechanism such as a clamp plate at a position near a worm wheel provided at an intermediate portion of the main shaft. This is because the indexing table needs to reliably and accurately hold the angle indexed by fine angle adjustment.

  However, if such an indexing table clamping mechanism is used as it is in a rotating device, a new problem arises. In the case of a rotating device, there is a large piston for applying an operating pressure in the vicinity of the pinion gear. Therefore, unless the height of the device is increased, a large plate diameter such as a clamp plate cannot be secured. is there.

  As an example of this measure, it is conceivable to reduce the piston diameter and increase the plate diameter of the clamp mechanism. However, in this case, the rotation of the main shaft by the piston and the fixed holding force are reduced, so that the piston diameter cannot be reduced.

  Accordingly, the present invention has been made to solve the above-described problem. In providing a clamp mechanism in a rotating device, the height of the device is maintained and the clamp mechanism is maintained without reducing the piston diameter. An object of the present invention is to provide a rotating device capable of increasing the plate diameter as much as possible.

  In the rotating device of the present invention, the bearing that supports the main shaft that fixes and holds the workpiece is disposed between the pinion gear and the clamp mechanism, so that the axial distance of the bearing is increased between the pinion gear and the clamp mechanism. I try to secure it.

  Specifically, the first invention includes a body, a main shaft rotatably supported by the body, a work piece fixedly held at one end and a pinion gear provided at an intermediate portion, and a pinion gear of the main shaft A rotating device comprising a piston having a rack gear meshing with the piston and a piston operating means for moving the piston by applying an operating pressure to the piston. A clamp mechanism that fixes and holds the main shaft to the body via a clamp plate is provided, and a bearing that rotatably supports the main shaft on the body is disposed between the pinion gear and the clamp mechanism. This is a rotating device.

  According to the above configuration, the pinion gear and the clamp mechanism are provided by providing the clamp mechanism on the other end side of the main shaft and disposing the bearing that rotatably supports the main shaft between the pinion gear and the clamp mechanism. A distance in the axial direction corresponding to the bearing arrangement can be secured.

  For this reason, since the piston and the clamp mechanism can be laid out by effectively using the axial distance for the bearing arrangement, the plate diameter of the clamp mechanism can be increased without reducing the diameter of the piston.

  In addition, by placing a bearing between the pinion gear and the clamp mechanism, the support force of the main shaft at that part is increased, the support rigidity of the pinion gear and the positional accuracy of the clamp mechanism are also increased, and the fixed holding force of the main shaft is increased. Can be further enhanced.

  According to a second aspect of the invention, the clamp mechanism includes a first clamp plate fixed to the main shaft, and a second clamp fixed to the body and overlapped with the first clamp plate at a position radially outward from the bearing. A plate, and a clamp piston that moves in the axial direction at the overlapping position of the first clamp plate and the second clamp plate and presses both the plates toward the body side to fix the main shaft to the body side. It is the rotation apparatus characterized by these.

  According to the above configuration, the first clamp plate and the second clamp plate are overlapped at a position radially outward from the bearing, and the overlapped portion is pressed to the body side by the clamp piston, thereby fixing the main shaft. Yes. For this reason, since the clamp plate is pressed with a long lever length (radius) at a position on the radially outward side away from the center of the main shaft, the clamp piston is operated with a relatively small pressing force. Even the main shaft can be firmly fixed and held.

  Therefore, the main shaft can be reliably fixed and held without increasing the operating pressure (pressing force) of the clamp pinton, and an increase in the size of equipment such as a rotating device can be prevented.

  According to a third aspect of the present invention, an internal clearance reducing mechanism for reducing an internal clearance of the bearing is provided between the bearing and the clamping mechanism, and the internal clearance reducing mechanism is configured to connect the main shaft with the clamping mechanism. The rotating device is configured to reduce the internal clearance of the bearing at the same time when being fixed to the body.

  According to the above configuration, the internal clearance reducing mechanism for reducing the internal clearance of the bearing is provided, and when the main shaft is fixedly held by the clamp mechanism, the internal clearance reducing mechanism reduces the internal clearance of the bearing. Therefore, in addition to fixing and holding the main shaft by the clamp mechanism, the supporting force of the main shaft by the bearing can be increased.

  Therefore, the main shaft shakiness at the time of workpiece machining can be suppressed more reliably, and the workpiece machining accuracy can be increased.

  According to a fourth aspect of the present invention, the clamp mechanism includes a clamp piston that presses the clamp plate toward the body side, and the internal clearance reducing mechanism is configured to move the internal clearance of the bearing by the axial movement of the clamp piston. It is the rotary device characterized by reducing so that.

  According to the above configuration, the internal clearance reducing mechanism reduces the internal clearance of the bearing by the axial movement of the clamp piston of the clamp mechanism. That is, the internal clearance of the bearing can be reduced by using the clamp piston of the clamp mechanism.

  Therefore, the clamp piston of the clamp mechanism can also be used as a means for reducing the internal clearance of the bearing, and the fixing and holding force of the main shaft can be efficiently increased.

  According to a fifth aspect of the invention, the internal clearance reducing mechanism is a bearing push plate that presses the inner race of the bearing.

  According to the above configuration, since the internal clearance reducing mechanism is the bearing push plate that presses the inner race of the bearing, the radial size of the member that presses the bearing can be reduced, and the size can be reduced.

  Therefore, even if an internal clearance reducing mechanism is provided, the rotating device can be configured compactly.

  A sixth aspect of the present invention is the rotating device, wherein the clamp plate and the bearing push plate are fastened and fixed to the main shaft with the same bolt.

  According to the above configuration, the clamp plate and the bearing push plate are fastened and fixed to the main shaft with the same bolt, so that the axial movement of the clamp plate is directly transmitted to the bearing push plate, which is effective. It is possible to transmit the axial movement of the clamp piston. Further, the device can be made compact by fixing together with one bolt.

  Therefore, the operating pressure (pressing force) of the clamp pinton can be more efficiently transmitted to the clamp plate and the bearing push plate without waste.

  According to the present invention, since the piston and the clamp mechanism can be laid out by effectively using the axial distance corresponding to the bearing arrangement, the plate diameter of the clamp mechanism can be increased without reducing the diameter of the piston. .

  Therefore, when the clamp mechanism is provided in the rotating device, the plate diameter of the clamp mechanism can be increased as much as possible without reducing the piston diameter while maintaining the height of the device.

It is the whole perspective view showing the rotation device of a first embodiment of the present invention. It is a horizontal sectional view showing the internal structure of the rotating device of the first embodiment. It is a transverse vertical sectional view showing the internal structure of the rotating device of the first embodiment. FIG. 4 is an enlarged detailed cross-sectional view at a Z portion in FIG. 3. It is a figure explaining the rotation state of a main shaft, (a) is sectional drawing of the main shaft 0 degree position, (b) is a sectional view of the main shaft 45 degree position, (c) is a sectional view of the main shaft 90 degree position. is there. It is a figure explaining the clamp state of a clamp mechanism, (a) is a schematic diagram of the state which is not performing the clamp operation | movement, (b) is a schematic diagram of the state which is performing the clamp operation | movement. It is a flowchart explaining the flow of the cutting process using a rotation apparatus. FIG. 5 is a view corresponding to FIG. 4 in the rotating device of the second embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that the following description of the preferred embodiments is merely illustrative in nature and is not intended to limit the present invention, its application, or its use.
(First embodiment)
1 is an overall perspective view of the rotating device of the first embodiment, FIG. 2 is a horizontal sectional view showing the internal structure of the rotating device, and FIG. 3 is a transverse vertical sectional view showing the internal structure of the rotating device. 4 is an enlarged detailed cross-sectional view at a Z portion in FIG.

  As shown in FIGS. 1 to 4, the rotating device U of the present embodiment includes a metal body 1 having a rectangular box shape. A substantially cylindrical (hollow) main shaft 2 extending in the vertical direction is rotatably supported at the center of the body 1. A plurality of fixing bolt holes 22 for fixing a workpiece (not shown) are formed on the table surface 21 at the upper end (one end) of the main shaft 2. In addition, mounting bolts 3 and 3 for installing and fixing the rotating device U to a machine tool (not shown) are provided at four locations around the body 1 (only two locations are disclosed in FIG. 1). ing.

  As shown in FIG. 2, a first cylinder 4 and a second cylinder 5 extending in the horizontal direction are formed in the body 1 in parallel with each other, and the first cylinder 4 has a first cylinder at both ends. A first piston 6 provided with a piston surface 61 and a second piston surface 62 is accommodated in a freely reciprocating manner, and a third piston surface 71 and a fourth piston surface 72 are provided inside the second cylinder 5 at both ends. Two pistons 7 are accommodated so as to be reciprocally movable.

  Between the first piston 6 and the second piston 7, the main shaft 2 is disposed so as to extend in the vertical direction so as to be orthogonal to the pistons 6 and 7.

  Rack gears 63 and 73 having tooth surfaces extending in the axial direction of the pistons 6 and 7 are formed on the side surfaces of the first piston 6 and the second piston 7 on the main shaft 2 side (inward side), respectively. Yes. The main shaft 2 is formed with a pinion gear 23 that meshes with the rack gears 63 and 73.

  By providing the rack gears 63 and 73 and the pinion gear 23 in this way, when the first piston 6 and the second piston 7 reciprocate in the cylinders 4 and 5 in the opposite directions, the main shaft 2 Is configured to rotate within the body 1.

  In FIG. 2, 8 is a side cover that seals one end side of the first cylinder 4 and the second cylinder 5, 9 is a first block that blocks the other end side of the first cylinder 4, and 10 is a second block. This is a second block that seals the other end of the cylinder 5, both of which constitute a part of the body 1. The first cylinder 4 and the second cylinder 5 are sealed in the body 1 by these three members 8, 9 and 10. Among these, the first adjustment bolt 11 is provided in the first block 9, and the second adjustment bolt 12 is provided in the second block 10 so as to penetrate the blocks 9 and 10, respectively.

  These adjustment bolts 11 and 12 are configured such that a boss portion 64 provided on the first piston surface 61 and a boss portion 74 provided on the third piston surface 71 are in contact with each other. When these boss portions 64 and 74 come into contact with the adjustment bolts 11 and 12, the movement of the first piston 6 and the second piston 7 is stopped, and the stop position is adjusted by the adjustment bolts 11 and 12. Yes.

  Although the air supply passage that is the working fluid is not described in detail, as shown in FIG. 1, the right block 9 is provided with a first air supply / exhaust port 14 for taking in air from the air pump 13 that is the piston operating means, Similarly, the left block 10 is provided with a second air supply / exhaust port 16 for taking in air from an air pump 15 which is a piston operating means.

  Then, as shown in FIG. 2, the air supplied from the first air supply / exhaust port 14 branches in the first block 9, and one of the two is constituted by the first piston surface 61 and the first cylinder inner wall 4a. The pressure chamber 17 is introduced into the first pressure chamber 17 and the other is introduced into the fourth pressure chamber 20 including the fourth piston surface 72 and the second cylinder inner wall 5a. On the other hand, the air supplied from the second air supply / exhaust port 16 branches in the second block 10 and one is introduced into the third pressure chamber 19 constituted by the third piston surface 71 and the second cylinder inner wall 5a. The other is configured to be introduced into the second pressure chamber 18 constituted by the second piston surface 62 and the first cylinder inner wall 4a.

  As shown in FIG. 3, the main shaft 2 is constituted by a substantially truncated cone-shaped cylindrical member having a large diameter at the upper part and a small diameter at the lower part. A fixing bolt hole 22 for attaching the pinion gear 23 is drilled, and the above-described pinion gear 23 is provided at an intermediate portion. Further, a clamp mechanism 100 described later is provided below the main shaft 2. A hollow disc-shaped front cover 31 that defines the position of the table surface 21 and seals the inside of the body 1 is provided around the table surface 21 of the main shaft 2 via a seal member 31A.

  A first bearing 40 that rotatably supports the upper end portion of the main shaft 2 is provided below the table surface 21 of the main shaft 2. The first bearing 40 is constituted by a deep groove ball bearing having steel plate shields 41, 41 on both sides, an outer race 42 is fitted and supported on the body 1, and the main shaft 2 is supported by the inner race 43. Yes. In addition, you may comprise this 2nd bearing 40 by a structure with an open-type deep groove ball bearing.

  On the other hand, a second bearing 50 that rotatably supports the lower end portion of the main shaft 2 is provided below the pinion gear 23 of the main shaft 2. The second bearing 50 is formed of an open-type deep groove ball bearing. An outer race 51 is fitted and supported on the body 1, and the main shaft 2 is supported by the inner race 52. The second bearing 50 is formed of a deep groove ball bearing having a smaller diameter than the first bearing 40 described above.

  Further, between the first bearing 40 and the second bearing 50, the first piston 6 and the second piston 7 described above are arranged in a direction orthogonal to the main shaft 2. As can be seen from FIG. 3, the first piston 6 and the second piston 7 have a relatively large diameter. This is because the first piston 6 and the second piston 7 need a rotational force to rotate the main shaft 2 quickly, and a certain fixing force is required when the main shaft 2 is fixed. It is.

  A clamp mechanism 100 is provided below the second bearing 50. The clamp mechanism 100 includes a clamp piston 101 that moves in the axial direction by the operating pressure of air supplied to the clamp pressure chamber 103, a clamp plate 102 that receives the pressing force of the clamp piston 101, and fixes the main shaft 2. A clamp cylinder 104 that divides the clamp pressure chamber 103 between the clamp piston 101 and a return spring 105 that returns the clamp piston 101 to a standby position (lower position in the drawing) is provided.

  An internal clearance reducing mechanism 110 that reduces the internal clearance of the second bearing 50 is provided below the second bearing 50.

  The clamp mechanism 100 and the internal clearance reducing mechanism 110 will be described in more detail with reference to FIG.

  The clamp cylinder 104 of the clamp mechanism 100 is constituted by a shallow dish-shaped disk member having a center hole and a peripheral edge 104a rising upward, and a plurality of fastening bolts 106 (only one is disclosed in FIG. 4) is provided on the lower surface of the body 1. ). Further, as shown in FIG. 3, the clamp cylinder 104 is formed with a supply / discharge passage 107 for air sent from the body 1 side, and this supply / discharge passage 107 is formed between the clamp cylinder 104 and the clamp piston 101. The clamp pressure chamber 103 communicates.

  The crank piston 101 of the clamp mechanism 100 is formed in a donut disk shape with the outer peripheral portion 101a protruding upward, and the outer peripheral end 101b and the inner peripheral end 101c are in close contact with and slidably contact the cylinder inner walls 104b and 104c, respectively. Yes. In addition, sealing materials 108 and 108 for preventing air leakage are fitted and fixed at these contact positions, respectively.

  The clamp plate 102 of the clamp mechanism 100 is fixed to the main shaft 2 by a fixing bolt 109 and a deformable annular plate-like second clamp plate 102B fixed together by a fastening bolt 106 that fixes the clamp cylinder 104. It is configured by a deformable disc-shaped first clamp plate 102A. Further, on the upper side of the second clamp plate 102 </ b> B, a flange plate 106 </ b> A that is fastened together with the fastening bolt 106 is provided. The clamp plates 102A and 102B are not limited to two as described above, and may be one, three, four, or the like.

  The outer diameter of the first clamp plate 102A and the inner diameter of the second clamp plate 102B are set so that the first clamp plate 102A and the second clamp plate 102B are partially overlapped in the radial direction. The overlapping portion 102x is pressed toward the body 1 side from below by the pressing portion 101d of the clamp piston 101, whereby both the clamp plates 102A and 102B are pressed, and the first clamp plate 102A and the second clamp plate 102B and the body are pressed. The main shaft 2 is configured to be non-rotatably fixed to the body 1 by being sandwiched between and frictionally contacted with the body 1.

  The overlapping portion 102x (overlapping position) is set on the radially outer side than the second bearing 50. By setting in this way, a long distance (lever length) from the center of the main shaft 2 is ensured, and a large fixed torque can be obtained even if the pressing force of the clamp piston 101 is small. That is, the main shaft 2 can be efficiently fixed and held even with a small pressing force. This is possible because the clamp plate 102 of the clamp mechanism 100 is composed of a relatively large-diameter plate member.

  The internal clearance reducing mechanism 110 includes a bearing push plate 111 that is fastened to the main shaft 2 together with the first clamp plate 102A by the fixing bolt 109. The bearing push plate 111 is displaced to an inner peripheral side fixing portion 111a fixed to the main shaft 2 by a fixing bolt 109, and a stepped upward to the fixing portion 111a, and presses the inner race 52 of the second bearing 50. And a thick-walled donut disk-shaped member including a pressing portion 111b on the outer peripheral side.

  The bearing push plate 111 is fixed to the main shaft 2 with fixing bolts 109 so as to pre-load the inner race 52 in the axial direction with the pressing portion 111b in advance. That is, the pressing portion 111b protruding upward from the fixing portion 111a is brought into contact with the inner race 52 and screwed and fixed to the main shaft 2 with the fixing bolt 109, so that a slightly upward pressing force is applied to the pressing portion 111b. Is generated. Thereby, the 2nd bearing 50 can always support the main shaft 2 in a state with few internal clearances, and can improve the support rigidity of the main shaft 2. FIG.

  The bearing push plate 111 is further pressed upward via the clamp plate 102 as described later when the clamp piston 101 of the clamp mechanism 100 is operated. Therefore, the inner race 52 of the second bearing 50 can be further pressed to reduce the internal clearance of the second bearing 50. Therefore, the support rigidity of the main shaft 2 can be further increased.

  Next, the operation state of the rotating device of the first embodiment will be described with reference to FIGS. 5A is a cross-sectional view of the main shaft 2 at the 0 degree position, FIG. 5B is a cross sectional view of the main shaft 2 at the 45 degree position, and FIG. 5C is a cross sectional view of the main shaft 2 at the 90 degree position. It is. FIG. 6A is a schematic diagram in a state where the clamping mechanism 100 is not performing a clamping operation, and FIG. 6B is a schematic diagram in a state where the clamping mechanism 100 is performing a clamping operation. In addition, about the description of the component of each figure, it abbreviate | omits by attaching | subjecting the code | symbol mentioned above.

  The rotation operation of the main shaft 2 of the rotating device U is performed, for example, in the flow from FIG. 5A to FIG. 5B and further to FIG.

  First, when air is supplied from the second air supply port 16 of the second block 10 in the state of the 0 degree position in FIG. 5A, the air branched in the second block 10 And supplied to the second pressure chamber 18. When air is supplied to the second pressure chamber 18, the first piston 6 starts moving to the right side of the drawing. Further, when air is supplied to the third pressure chamber 19, the second piston 7 starts to move to the left side of the drawing. The mark “◯” on the main shaft 2 is a mark described for convenience in order to indicate a guideline for the change in the rotational position of the main shaft 2.

  When the air supply is continued, the volume of the second pressure chamber 18 and the third pressure chamber 19 expands in the state of the 45 degree position in FIG. 6 and the second piston 7 move in the cylinders 4 and 5, respectively. The movement of the first piston 6 and the second piston 7 causes the main shaft 2 to rotate in the clockwise direction by the action of the rack gears 63 and 73 and the pinion gear 23.

  Thereafter, when the supply of air is continued, the volume of the second pressure chamber 18 and the third pressure chamber 19 becomes maximum in the state of the 90-degree position in FIG. 7 stops moving. At this time, the boss portion 64 of the first piston 6 abuts against the first adjustment bolt 11, so that the movement of the first piston 6 stops, and the action of the rack gears 63 and 73 and the pinion gear 23 causes the main shaft 2 to move. The rotation also stops.

  In this state, if the supply of air is continued, a slight “gap D” is set in the fourth pressure chamber 20. Therefore, a force that moves the second piston 7 to the left side of the drawing acts, and the main shaft 2 is prevented from rotating counterclockwise in the drawing. This rotation prevention state is a rotation position holding state of the main shaft 2 by the meshing surfaces of the rack gears 63 and 73 and the pinion gear 23.

  However, since the fixed holding force is low in this rotational position holding state, the clamp mechanism 100 is provided in this embodiment. The clamping operation of the clamping mechanism 100 is performed in the flow shown in FIGS. 6 (a) to 6 (b). In FIG. 6, the clamp plate 102 is represented by one piece for simplification.

  In the state where the clamp operation shown in FIG. 6A is not performed, the clamp piston 101 of the clamp mechanism 100 is in the standby position, and the clamp plate 102 is opened. For this reason, the main shaft 2 is separated from the body 1 and can freely rotate. In this state, since the main shaft 2 is not fixed to the body 1 at all, the amount of displacement in the axial direction is large and the movement in the direction of tilting the shaft is also large, as indicated by the arrows.

  When air is supplied to the clamp pressure chamber 103 (see FIG. 4) of the clamp mechanism 100, the clamp operation shown in FIG. 6B is performed. In this state, the clamp piston 101 moves upward and presses the clamp plate 102 toward the body 1, so that the clamp plate 102 and the body 1 come into frictional contact, and the main shaft 2 is integrated with the body 1. Since the main shaft 2 is integrated with the body 1 in this way, the main shaft 2 is fixed. Therefore, as shown by the arrows, the axial displacement of the main shaft 2 is small and the movement in the shaft collapse direction is also small. . Thereby, the fixed holding force of the main shaft 2 which fixes a workpiece | work (not shown) improves markedly.

  Further, as shown in FIG. 6B, when the clamp piston 101 moves upward, an upward pressing force is also applied to the bearing push plate 111 via the clamp plate 102. The inner race 52 of the second bearing 50 can be pushed up to reduce the internal clearance of the second bearing 50. For this reason, the fixing holding force of the main shaft 2 can be further increased even at the position of the second bearing 50, and the main shaft 2 is fixedly supported on the body 1 at two locations together with the position of the clamp plate 102 described above. It becomes a state like this.

  Next, a processing procedure at the time of processing a workpiece using the rotating device U of the first embodiment will be described using the flowchart of FIG.

  First, in step S1, a jig is attached to the machine tool, and a workpiece is attached to the rotating device U installed in the machine tool. Then, rotation command A is performed in step S <b> 2, and air is supplied to the first air supply / exhaust port 14. This supply of air is performed from the air pump 13 and is continued until the next rotation command B is performed. Here, the rotation command A is a command for rotating the main shaft 2 to a rotation position A (for example, 90 ° position in the present embodiment), and the rotation command B is a rotation command B for rotating the main shaft 2 to a rotation position B (for example, In this embodiment, it is a command to rotate to 0 degree position).

  Thereafter, when the supply of air continues, the rotation of the main shaft 2 stops at the rotational position A in step S3. In this state, since the supply of air is continued, the rotational position of the main shaft 2 is maintained.

  Next, a clamp command is issued in step S <b> 4 and air is supplied to the clamp mechanism 100. By this clamp command, the clamp piston 101 of the clamp mechanism 100 is actuated, and the main shaft 2 is fixed to the body 1. Thereby, the fixed holding force of the main shaft 2 is remarkably increased.

  Then, the workpiece is processed at the rotational position A in step S5. In machining the workpiece at this rotational position A, the main shaft 2 has a high fixed holding force, so that even if a relatively large machining load acts on the workpiece, the main shaft 2 can be prevented from rattling. It becomes possible.

  Thereafter, when the machining is completed, an unclamp command is issued in step S6, and the air to the clamp mechanism 100 is stopped. As a result, the main shaft 2 is separated from the body 1.

  Next, a rotation command B is performed in step S <b> 7, and air is supplied to the second air supply / exhaust port 16. This supply of air is performed from the air pump 15 and then continued until the operation is turned off. And if supply of air continues, rotation of the main shaft 2 will stop in the rotation position B by process S8. Even in this state, since the supply of air is continued, the rotational position of the main shaft 2 is maintained.

  Next, a clamp command is issued in step S <b> 9 and air is supplied to the clamp mechanism 100. Also here, the clamp piston 101 of the clamp mechanism 100 is operated, and the main shaft 2 is fixed to the body 1. Thereby, the fixed holding force of the main shaft 2 increases.

  Then, the workpiece is processed at the rotational position B in step S10. Even when the workpiece is processed at this rotational position B, the main shaft 2 has a high fixed holding force. Therefore, even if a large processing load is applied to the workpiece, the main shaft 2 is not rattled and the workpiece can be precisely processed. .

  Thereafter, when the processing is completed, an unclamping command is issued in step S11, and air to the clamping mechanism 100 is stopped. Thus, the main shaft 2 is separated from the body 1.

  Finally, by removing the jig from the machine tool and removing the workpiece from the rotating device U in step S12, the workpiece processing procedure using the rotating device of this embodiment is completed.

  As described above, according to the rotating device U of the present embodiment, the rotation position of the main shaft 2 is not only maintained by the rotation position of the air supply by the rotation command, but also fixed and held by the clamp mechanism 100. The fixed holding force of 2 is remarkably increased. For this reason, the machining accuracy of the workpiece can be further increased.

  In the present embodiment, since the second bearing 50 is disposed on the main shaft 2 between the pinion gear 23 and the clamp mechanism 100, the second bearing 50 is interposed between the pinion gear 23 and the clamp mechanism 100. The axial distance for the arrangement can be ensured.

  Therefore, since the pistons 6 and 7 and the clamp mechanism 100 can be laid out by effectively using the axial distance corresponding to the arrangement of the second bearing 50, the diameters of the first piston 6 and the second piston 7 are not reduced. The plate diameter of the clamp plate 102 of the clamp mechanism 100 can be increased.

  Therefore, when the rotation mechanism U is provided with the clamp mechanism 100, the clamp plate 102 of the clamp mechanism 100 is maintained without reducing the piston diameter of the first piston 6 or the second piston 7 while maintaining the height of the rotation apparatus U. The plate diameter can be made as large as possible.

  In addition, since the second bearing 50 that increases the support force of the main shaft 2 is disposed between the pinion gear 23 and the clamp mechanism 100 in this way, the support rigidity of the pinion gear 23 and the position holding accuracy of the clamp mechanism 100 are as follows. As a result, the fixing holding force of the main shaft 2 can be further increased.

  In the present embodiment, the overlapping portion 102x of the first clamp plate 102A and the second clamp plate 102B is set on the radially outer side than the second bearing 50, and the overlapping is performed by the pressing portion 101d of the clamp piston 101. The part 102x is set to be pressed toward the body 1 side.

  As a result, the clamp plate 102 can be pressed with a long lever length (radius) at a position on the radially outer side away from the center of the main shaft 2, and even when pressed by the clamp piston 101 with a small pressing force. The main shaft 2 can be firmly fixed to the body 1 side.

  Therefore, the main shaft 2 can be reliably fixed and held without increasing the pressing force of the clamp pinton 101, and the equipment such as the rotating device U can be prevented from being enlarged.

  In the present embodiment, an internal clearance reducing mechanism 110 that reduces the internal clearance of the second bearing 50 is provided between the second bearing 50 and the clamping mechanism 100, and the main shaft 2 is attached to the body 1 by the clamping mechanism 100. At the time of fixing and holding, the internal clearance of the second bearing 50 is simultaneously reduced.

  Accordingly, when the main shaft 2 is fixedly held by the clamp mechanism 100, the internal clearance of the second bearing 50 is also reduced. Therefore, in addition to the main shaft 2 being fixedly held by the clamp mechanism 100, the main shaft 2 The support force of the shaft 2 can also be increased.

  Therefore, the play of the main shaft 2 at the time of workpiece machining can be more reliably suppressed, and the workpiece machining accuracy can be increased.

  In the present embodiment, the internal clearance reducing mechanism 110 is configured to reduce the internal clearance of the second bearing 50 by the axial movement of the clamp piston 101 of the clamp mechanism 100.

  Thereby, the internal clearance of the second bearing 50 can be reduced using the clamp piston 101 of the clamp mechanism 100.

  Therefore, the clamp piston 101 of the clamp mechanism 100 can also be used as a means for reducing the internal clearance of the second bearing 50, and the fixing and holding force of the main shaft 2 can be increased efficiently.

  In the present embodiment, the internal clearance reducing mechanism 110 is constituted by a bearing push plate 111 that presses the inner race 52 of the second bearing 50.

  Thereby, the size of the radial direction of the member which presses the 2nd bearing 50 can be made small, and size reduction can be achieved. For this reason, even if the internal clearance reducing mechanism 110 is provided, the rotating device U can be configured compactly.

  In the present embodiment, the first clamp plate 102 </ b> A and the bearing push plate 111 are fastened and fixed to the main shaft 2 with the same fixing bolt 109. Thereby, the axial movement of the first clamp plate 102A is directly transmitted to the bearing push plate 111, and the axial movement of the clamp piston 101 can be effectively transmitted. Further, the device can be made compact by fixing together with one fixing bolt 109.

Therefore, the operating pressure (pressing force) of the clamp piston 101 can be more efficiently transmitted to the first clamp plate 102A and the bearing push plate 111 without waste.
(Second embodiment)
Next, the rotating device U of the second embodiment will be described with reference to FIG. The rotating device U according to the second embodiment differs from the first embodiment in the structure of the clamp mechanism 200, and is configured by a clamp mechanism 200 using a force-increasing means such as a lever member 201. In addition, about the description of the component same as 1st embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  The force increasing means of the clamp mechanism 200 according to the second embodiment is a rod-shaped lever member that is swingable in the vertical direction (main shaft biaxial direction) with the fulcrum 201a at the outer end supported by the body 1. 201, a pressure receiving ring 201 pressed from the lever member 201, and a guide ring 203 that restricts the circumferential movement of the lever member 201. Among these, the guide ring 203 is fixed to the body 1 by a mounting bolt (not shown). Reference numeral 206 denotes a clamp cylinder.

  The lever member 201 is swingably supported with respect to the body 1 by the support portion 201a at the outer end, receives the pressing force from the clamp piston 204 by the input portion 201b at the inner end, and presses at the intermediate position 201c. The pressure receiving ring 202 is pressed.

  Here, the distance (L1) between the support part 201a of the lever member 201 and the input part 201b is different from the distance (L2) between the support part 201a of the lever member 201 and the pressing part 201c, and L1 is greater than L2. Large (L1> L2). Therefore, the pressing force of the crank piston 204 is increased by the lever member 201 and transmitted to the pressure receiving ring 202. Specifically, the pressing force of the crank piston 204 is amplified by a ratio of L1: L2 and transmitted to the pressure receiving ring 202.

  For this reason, when the pressure receiving ring 202 is pressed upward in the axial direction, the pressure receiving ring 202 presses the clamp plate 102, and the clamp piston 204 is activated in the same manner as the clamp mechanism 100 of the first embodiment. In this case, the main shaft 2 can be fixed to the body 1.

According to the second embodiment, since the fixing and holding force of the main shaft 2 by the clamp mechanism 200 is increased by the effect of increasing the force by the lever member 201, the workpiece machining accuracy can be further increased. Moreover, since the diameter of the clamp piston 204 can also be made compact, the enlargement of the rotating device U can be prevented.
(Other embodiments)
As described above, the two embodiments have been described. However, the present invention may be modified as appropriate without departing from the scope of the object, and is not limited to this embodiment.

  For example, the bearing may be configured such that the main shaft 2 is supported by only one of the second bearings 50 without the first bearing 40, and the type of roller bearing, needle bearing, etc. There is no particular restriction.

  Further, the piston of the rotating device U may also be constituted by one of the first pistons 6. Further, the rotational position of the main shaft 2 of the rotating device U may be rotated by 0 to 180 degrees.

  In addition, the internal clearance reducing mechanism 110 that reduces the internal clearance of the bearing may be configured to press the inner race of the bearing using a seal member such as an O-ring, or a spring member. May be used to press the inner race of the bearing. Furthermore, you may comprise so that not the inner race but an outer race may be pressed and the internal clearance of a bearing may be reduced.

  As described above, the rotating device according to the present invention is useful in a rotating device such as a rotary actuator that is installed in a machine tool and rotates and fixes and holds a workpiece.

U ... rotating device 1 ... body 2 ... main shaft 4 ... first cylinder 5 ... second cylinder 6 ... first piston (piston)
7 ... Second piston (piston)
13. Air pump (piston actuating means)
15 ... Air pump (piston actuating means)
50 ... Second bearing (bearing)
52 ... Inner race 100 ... Clamp mechanism 101 ... Clamp piston 102 ... Clamp plate 102A ... First clamp plate 102B ... Second clamp plate 109 ... Fixing bolt (bolt)
110 ... Internal clearance reduction mechanism 111 ... Bearing push plate

Claims (6)

A body, a main shaft rotatably supported by the body, having a work fixed at one end and provided with a pinion gear at an intermediate portion, a piston having a rack gear meshing with the pinion gear of the main shaft, and the piston A piston operating means for moving the piston by applying an operating pressure to the rotating device,
On the other end side of the main shaft, a clamp mechanism for fixing and holding the main shaft to the body via a clamp plate when the workpiece is processed is provided.
A rotating device, wherein a bearing for rotatably supporting a main shaft on a body is disposed between the pinion gear and the clamp mechanism. The clamp mechanism includes a first clamp plate fixed to the main shaft,
A second clamp plate that is fixed to the body and overlaps the first clamp plate at a position radially outward from the bearing;
A clamp piston that moves in the axial direction at the overlapping position of the first clamp plate and the second clamp plate and presses both the plates toward the body side to fix the main shaft to the body side, The rotating device according to claim 1. An internal clearance reducing mechanism for reducing the internal clearance of the bearing is provided between the bearing and the clamp mechanism,
3. The rotating device according to claim 1, wherein the internal clearance reducing mechanism is configured to reduce the internal clearance of the bearing at the same time when the main shaft is fixed to the body by the clamp mechanism. The clamp mechanism includes a clamp piston that presses the clamp plate toward the body,
4. The rotating device according to claim 3, wherein the internal clearance reducing mechanism is configured to reduce the internal clearance of the bearing by the axial movement of the clamp piston. The rotating device according to claim 3 or 4, wherein the internal clearance reducing mechanism is a bearing push plate that presses an inner race of the bearing. 6. The rotating device according to claim 5, wherein the clamp plate and the bearing push plate are fastened and fixed to the main shaft with the same bolt.

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