JP2005313304A - Tilt table device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To propose a precision tilt table device with a clamp mechanism for a positioned table. <P>SOLUTION: The table 6 of the precision tilt table device 1 is kept in a clamped state by a spring force of a clamp actuator 20. At the time of positioning, the clamp actuator 20 is driven to drive a clamp force release mechanism consisting of a piezoelectric element and the like, thereby releasing the clamp of the table 6. In this state, the table 6 is oscillated vertically around a main shaft 4 by a positioning actuator 10 with an eccentric cam 12, thereby positioning the table 6 at a prescribed tilt position. After the positioning, the drive of the clamp force release mechanism of the clamp actuator 20 is released. As a result, a state where the positioned table 6 is clamped at the position is formed. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a tilting table device suitable for use to hold a workpiece at a predetermined tilting angle when cutting a machine tool.

  An inclination table device for holding a workpiece or the like at a predetermined inclination angle is generally designed on the premise of measurement applications. In the case of a measurement application, a load is not applied to the positioned table, and therefore a function for clamping the positioned table so as not to move is not provided. For this reason, the conventional inclination table apparatus was not suitable for uses, such as cutting which requires load.

  An object of the present invention is to propose an inclined table device provided with a clamp mechanism suitable for applications such as cutting.

  In order to solve the above problems, an inclined table device of the present invention includes: a main shaft; a table; a positioning mechanism for positioning the table; and a clamping mechanism for clamping the positioned table; The positioning mechanism includes a rotation output shaft, an eccentric cam attached to the rotation output shaft in an eccentric state, and a table support member that is pushed by the eccentric cam that rotates eccentrically and can swing about the main shaft. The table is supported by a table support member; the clamp mechanism releases a clamp force when driven by a spring member that generates a clamp force for fixing the table support member at a predetermined swing position. A hydraulic release mechanism that generates a release force for clamping, and a release mechanism that includes a piezoelectric element. There.

  Here, when the table support member can swing in the vertical direction, the contact state between the table support member and the eccentric cam can be formed by the gravity of the table and the table support member. When gravity cannot be used, a mechanism such as a hydraulic mechanism or a spring member for bringing the table support member into contact with the eccentric cam may be disposed.

  Next, in order to incline the table in different directions around different main axes, in other words, in order to realize a two-degree-of-freedom table, the inclined table device having the above-described configuration may be assembled in multiple stages.

  In this case, the table of one tilt table device can be multi-staged so as to support another tilt table device. Alternatively, the table support member of one tilt table device may be multi-staged so as to be directly supported by the other tilt table device. In either case, in general, a two-degree-of-freedom tilt table may be constructed by multistage such that the main axes of both tilt table devices are orthogonal to each other.

  The tilt table device of the present invention can clamp a table positioned in a predetermined tilt state by a clamp mechanism. Therefore, it is suitable for an application where a load acts on the table such as cutting.

  Below, with reference to drawings, the example of the precision inclination table apparatus to which this invention is applied is demonstrated.

(Embodiment 1)
Fig.1 (a) is a perspective view at the time of seeing the precision inclination table apparatus based on Embodiment 1 from diagonally forward, FIG.1 (b) is the front view. FIG. 2A is an elevational view when the precision tilting table device is viewed in the horizontal direction from diagonally forward, and FIG. 2B is a perspective view when viewed from the diagonally rear.

  The precision tilting table device 1 includes a rectangular base plate 2 on which a support block 3 is mounted. A main shaft 4 is horizontally attached to the support block 3 in the front-rear direction, and a table support plate 5 extending in the width direction is vertically arranged around the main shaft 4 at a front end portion of the main shaft 4. It is attached in a swingable state. The table support plate 5 includes a vertical plate portion 5a facing the front end of the support block 3, and a horizontal plate portion 5b that is bent at a right angle forward from the upper end and extends in one of the vertical plate portions 5a. A portion close to the end is a swing center 4 a by the main shaft 4. A rectangular table 6 is fixed to the upper surface of the horizontal plate portion 5b of the table support plate 5 having this shape. Five grooves extending in parallel in the front-rear direction are formed on the upper surface of the table 6.

  A positioning actuator 10 for positioning the table 6 at a predetermined inclined position and a clamp actuator 20 for clamping the positioned table 6 are attached to the support block 3 together with the main shaft 4. The positioning actuator 10 is mounted horizontally in the front-rear direction at the approximate center in the width direction of the support block 3, and a disc-shaped eccentric cam 12 is fixed to the tip of the rotation output shaft 11 in an eccentric state. A rectangular groove 5c is formed in a central portion in the width direction of the vertical plate portion 5b of the table support plate 5 so as to be rectangularly cut from the lower end, and the eccentric cam 12 is located here.

  When the eccentric cam 12 rotates eccentrically, the horizontal upper end surface portion 5d of the rectangular groove 5c is pushed up by the outer peripheral surface thereof. As a result, the table support plate 5 rotates upward about the main shaft 4, and the table 6 mounted thereon is inclined by a predetermined angle. By appropriately setting the eccentric amount of the eccentric cam 12, the distance from the main shaft 4 to the eccentric cam 12, and the like, the table 6 can be positioned at an inclined position within a predetermined angle range.

  Next, the clamp actuator 20 attached to the support block 3 is horizontally disposed in the front-rear direction at a position opposite to the main shaft 4, and the clamp shaft 21 can reciprocate in the front-rear direction. . The tip end portion of the clamp shaft 21 protrudes forward through a vertically slidable shaft hole 5e formed in the vertical plate portion 5a of the table support plate 5 positioned in front of the support block 3. . A washer 22 is coaxially attached to the projecting tip, and a stopper 23 is fixed to the front end. The washer 22 has a diameter sufficiently larger than the width of the shaft hole 5e. When the clamp shaft 21 of the clamp mechanism 20 is retracted after the table 6 is positioned at a predetermined inclined position by the positioning actuator 10, the vertical plate portion 5 a of the table support plate 5 is supported by the washer 22 at the tip of the clamp shaft 21. It is pressed against the front end face of the block 3 to form a table clamp state.

  FIG. 3 shows the positioning actuator 10 taken out, (a) is a plan view, (b) is a longitudinal sectional view of a portion cut along AA, and (c) is a perspective view when viewed obliquely from the front. FIG. The positioning actuator 10 includes a motor 13 and a speed reducer 14 that is coaxially attached to the front end thereof, and an eccentric cam 12 is attached to a tip portion of the rotation output shaft 11 of the speed reducer 14. A cam follower ring 15 is rotatably attached to the outer periphery of 12. The reducer 14 is, for example, a wave gear reducer, and an elliptical wave generator 14a fixed to the motor output shaft 13a, and a cup in which the external tooth forming portion is bent in an elliptical shape by the wave generator 14a. A flexible external gear 14b having a ring shape and a ring-shaped rigid internal gear 14c surrounding an external tooth forming portion of the external gear 14b. Both gears mesh with each other at both ends of the elliptical long axis, and a rigid internal gear 14 c is fixed to the actuator housing 16. When the meshing position of the two gears moves in the direction due to the rotation of the motor 13, the motor rotation is decelerated according to the difference in the number of teeth of the two gears (normally two), and the decelerated rotation is output from the rotation output shaft 11.

  FIG. 4 shows the clamp actuator 20 taken out, (a) is a plan view, (b) is a longitudinal sectional view of a portion cut along the line BB, and (c) is a view when viewed obliquely from the front. It is a perspective view. In the clamp actuator 20, the clamp shaft 21 passes coaxially with the cylindrical housing 24, and the rear end portion 21a of the clamp shaft 21 has a large diameter. Is always pulled in the retracting direction. Therefore, the spring force acts as a table clamping force.

  A piezoelectric element 27 is inserted between the rear end 21 a of the clamp shaft 21 and the support plate 26 attached to the rear end side of the housing 24. When a voltage is applied to the piezoelectric element 27, the piezoelectric element 27 extends in the axial direction of the clamp shaft 21, and a force opposite to the clamping force acts on the clamp shaft 21 so that the clamping force can be released. Yes.

  FIG. 5 is a schematic block diagram showing a control system of the precision tilt table apparatus 1. The control system 30 includes a sensor 31 and a controller 32 for detecting the tilt angle of the table 6 of the precision tilt table apparatus 1. The controller 32 compares the tilt information obtained from the sensor 31 with a target value supplied from a host device (not shown), and feedback controls the positioning actuator 10 so that the actual tilt angle matches the target value. To do. Further, during the positioning operation of the table 6, the piezoelectric element 27 of the clamp actuator 20 is driven and held in a state where the clamping force by the disc spring 25 is released, and after the positioning is completed, the voltage application to the piezoelectric element 27 is released. Then, the clamped state is restored by the spring force of the disc spring 25.

  The precision tilt table device 1 of this example configured as described above includes the clamp actuator 20 and can clamp the table 6 positioned at a predetermined tilt position by the positioning actuator 10 at that position. Therefore, it is suitable for use when a load is applied to the table 6 in cutting or the like.

  Further, in the clamp actuator 20, a clamping force is generated by the spring force of the disc spring 25, and the piezoelectric element 27 is driven only when the clamping force is released. Since the table positioning period is short and the clamp actuator 20 only needs to be driven for a short period, it is extremely advantageous for power saving.

  Furthermore, in this example, the contact state between the eccentric cam 12 and the table support plate 5 is held by the weight of the table support plate 5 and the table 6. Therefore, a mechanism for holding them in contact is unnecessary. Of course, as shown in FIG. 6, the table support plate 5 may be pressed against the eccentric cam 12 by a coil spring 41 or the like in order to keep them in contact. In particular, when the precision tilting table device 1 is used in a vertical position, it is necessary to attach a biasing means such as a coil spring.

  The clamp actuator 20 of this example uses the piezoelectric element 27 to release the clamping force, but another mechanism such as a hydraulic mechanism can also be used. Further, if a plurality of clamp actuators 20 are installed and the table 6 is clamped at a plurality of locations, the rigidity at the time of clamping can be improved.

(Embodiment 2)
FIG. 7 is a perspective view showing a precision tilt table device having two degrees of freedom. The precision tilt table apparatus 50 shown in this figure has a structure in which the precision tilt table apparatus 1 of the first embodiment is stacked in two stages. That is, a first precision tilt table device 51 and a second precision tilt table device 52 stacked in an orthogonal state on the table 6 (1) are provided. Since the tables 6 of the two devices 51 and 52 are inclined with respect to the horizontal main axis center lines 4a (1) and 4a (2) that are orthogonal to each other, the upper table 6 (2) is orthogonal to the center line 4a (1 ) And can be positioned at an inclined position centered on 4a (2).

(Embodiment 3)
FIG. 8 is a view showing another example of a precision tilt table device with two degrees of freedom, (a) is an elevation view when viewed horizontally from diagonally forward, and (b) is when viewed from diagonally rear. FIG. The precision tilting table device 60 of this example is basically configured by stacking the table devices 1 of the first embodiment in two stages, but the lower first precision tilting table device 61 has a table. Is not provided. Further, the upper second precision tilt table device 62 is not provided with a base plate, and the support block 3 (2) is directly supported by the table support plate 5 (1) of the first precision tilt table device 61. It is supported. Also in this example, the spindle center line 4a (1) of the first precision tilt table device 61 and the spindle center line 4a (2) of the second precision tilt table device 62 are orthogonal to each other. Therefore, the upper table 6 (2) can be positioned at an inclined position with two degrees of freedom.

(A) is a perspective view at the time of seeing the precision inclination table apparatus based on Embodiment 1 which applied this invention from diagonally forward, (b) is the front view. (A) is an elevational view when the precision tilting table device is viewed in the horizontal direction from diagonally forward, and (b) is a perspective view when viewed from the diagonally rear. (A) is a top view of a positioning actuator, (b) is a longitudinal cross-sectional view of the part cut | disconnected by AA, (c) is a perspective view at the time of seeing from diagonally forward. (A) is a top view of a clamp actuator, (b) is a longitudinal cross-sectional view of the part cut | disconnected by the BB line, (c) is a perspective view at the time of seeing from diagonally forward. It is a schematic block diagram which shows the control system of a precision inclination table apparatus. It is an elevation view which shows another example of a precision inclination table. It is a perspective view which shows the precision inclination table apparatus of 2 degrees of freedom. (A) is the elevation view at the time of seeing horizontally from the diagonal front which shows another example of the precision inclination table apparatus of 2 degrees of freedom, (b) is the perspective view.

Explanation of symbols

1, 50, 60 Precision tilting table device 2 Base plate 3 Support block 4 Spindle 5 Table support plate 5a Vertical plate portion 5b Horizontal plate portion 5d Upper end surface portion 5e Shaft hole 6 Table 10 Positioning actuator 11 Output rotating shaft 12 Eccentric cam 20 Clamp Actuator 21 Clamp shaft 22 Washer 30 Control system 31 Sensor 32 Controller 51, 52, 61, 62 Precision tilt table device

Claims (7)

The spindle,
Table,
A positioning mechanism for positioning the table;
A clamping mechanism for clamping the positioned table;
The positioning mechanism includes a rotation output shaft, an eccentric cam attached to the rotation output shaft in an eccentric state, and a table support member that is pivoted about the main shaft by being pushed by the eccentric cam that rotates eccentrically. The table is supported by the table support member,
The clamp mechanism includes a spring member that generates a clamp force for fixing the table support member at a predetermined swing position, and a hydraulic mechanism that generates a clamp release force for releasing the clamp force when driven. An inclined table device comprising a clamp release mechanism made of a piezoelectric element or the like. In claim 1,
The table support member can swing in the vertical direction,
A tilting table device, wherein the table support member and the eccentric cam are in contact with each other by gravity of the table and the table support member. In claim 1,
An inclined table device having a mechanism such as a hydraulic mechanism and a spring member for bringing the table support member into contact with the eccentric cam. Having first and second tilting table devices;
The first tilting table device has a configuration in which the table is omitted from the tilting table device according to claim 1, 2, or 3.
The second tilt table device is the tilt table device according to claim 1, 2, or 3.
A tilt table device in which the second tilt table device is supported by the table support member of the first tilt table device. Having first and second tilting table devices;
These first and second tilting table devices are tilting table devices according to claim 1, 2, or 3,
A tilt table device in which the second tilt table device is supported by the table of the first tilt table device. In claim 4 or 5,
The main table of each of the first and second tilt table devices is orthogonal to the tilt table device. An inclined table device according to any one of claims 1 to 6,
A sensor for detecting the tilt of the table of the tilt table device;
And a controller that feedback-controls the tilt of the table based on the sensor output.

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