JPH0819924A - Eccentric table device - Google Patents

Abstract

PURPOSE:To provide an eccentric table device capable of improving machining precision and. simplifying a mechanism. CONSTITUTION:This eccentric table device 14 is constituted by arranging an inside eccentric board 4 on which a work W is installed at a position decentered from a shaft center B of an outside eccentric board 2 free to rotate and supporting the outside eccentric board 2 free to rotate by a device main body 1, and it rotates a part W1 to be machined of the work W around a shaft center A of the inside eccentric board 4 as its center while revolving it around a shaft center B of the outside eccentric board 2 as its center. A motor 7b for revolutional driving to revolutionally drive the outside eccentric board 2 is fixed on the device main body 1, and a motor for rotational driving to rotationally drive the inside eccentric board 4 is fixed on the outside eccentric board 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an eccentric table device suitable for machining, for example, a scroll shape. More specifically, the eccentric table device is rotated while rotating a workpiece to be processed without complicating the structure. And an improved eccentric disc drive structure.

[0002]

2. Description of the Related Art Conventionally, as disclosed in Japanese Patent Application Laid-Open No. 4-171112 as a processing device for scroll-shaped workpieces, an X-axis moving base slidable in an X-axis direction orthogonal to a moving direction of a tool. And a rotary table which is mounted on the X-axis moving table to detachably fix the workpiece and which is rotationally driven around the rotary axis.

When performing scroll shape machining or the like in the above conventional apparatus, the rotary table is rotationally driven while moving the X-axis moving table in the X-axis direction, and the workpiece is cut by the tool.

[0004]

However, in the scroll shape machining apparatus described in the above publication, machining is performed by the construction of orthogonal linear drive shafts. Therefore, when performing an arc motion like an involute curve, when switching the shaft drive direction. There is a problem that quadrant projections are generated due to the backlash that occurs and machining cannot be performed accurately.

Therefore, as a scroll shape machining apparatus not relying on the linear drive shaft, an inner eccentric disc on which a work is mounted is rotatably arranged at a position eccentric from the axial center of the outer eccentric disc, and the outer eccentric disc is installed. An eccentric table device that is rotatably supported by a device fixing portion is conceivable. However, in this eccentric table device, when the inner eccentric disc and the outer eccentric disc are driven by drive motors fixed to the device fixing portion, respectively, in order to absorb the rotational angle deviation of both eccentric discs,
For example, a differential gear mechanism as disclosed in Japanese Patent Publication No. 49-16398 is required.

The present invention has been made in view of the above conventional problems, and an object of the present invention is to provide an eccentric table device capable of improving the processing accuracy and simplifying the mechanism.

[0007]

According to a first aspect of the present invention, an inner eccentric disc on which a work is mounted is rotatably disposed at a position eccentric from the axis of the outer eccentric disc, and the outer eccentric disc is fixed to the apparatus. An eccentric table device which is rotatably supported by a portion and which rotates about the axis of the inner eccentric disc while rotating the part to be machined of the workpiece about the axis of the outer eccentric disc. It is characterized in that a turning drive motor for turning and driving the outer eccentric disc is fixed, and a rotation driving motor for rotationally driving the inner eccentric disc is fixed to the outer eccentric disc.

According to a second aspect of the present invention, in the first aspect, the first rotary power feeding device for supplying electric power to the rotation driving motor from the outside includes the device fixing portion side member and the outer eccentric disc side member. It is characterized in that it is arranged so as to be coaxial with the axis of the outer eccentric disc.

According to a third aspect of the present invention, in the first or second aspect, a second rotary power feeding device for supplying electric power to the electric actuator of the inner eccentric disc from the outside is provided with the outer eccentric disc side member and the inner eccentric disc. It is characterized in that it is arranged so as to be coaxial with the axis of the inner eccentric disc between the side member and the side member.

In the rotary power feeding device according to the second and third aspects, a non-contact type in which power is fed from the power feeding side to the power receiving side by magnetic coupling between the power feeding side core and the power receiving side core, a slip ring, etc. are used. Both of the slide contact type were included.

According to a fourth aspect of the present invention, there is provided an eccentric table device having a double eccentric structure having inner and outer eccentric discs.
It is characterized in that the tools are arranged on a circle centered on the axis of the outer eccentric disc and passing through the axis of the inner eccentric disc.

[0012]

According to the eccentric table device of the present invention, the outer eccentric disc and the inner eccentric disc are driven by separate drive motors fixed to the device fixing portion and the outer eccentric disc, respectively. Machining accuracy can be improved by eliminating the construction of orthogonal linear drive shafts, and the rotation angles of the inner and outer eccentrics can be controlled without employing a complicated differential mechanism. Can be simplified.

According to the eccentric table device of the second aspect of the present invention, the first rotary power feeding device is coaxial with the shaft center of the outer eccentric disc between the device fixing part side member and the outer eccentric disc side member. Since it is arranged as described above, the second aspect of the present invention is the second aspect.
Since the rotary power supply device is disposed between the outer and inner eccentric disc side members, the rotary drive motor and the electric actuator of the inner eccentric disc can be externally connected without directly connecting the rotary side member and the fixed side member with lead wires. Power can be supplied. As a result, the lead wires to the motor and the electric actuator do not get entangled, so that it is not necessary to limit the rotation range of the outer and inner eccentric discs, and reliability can be improved and maintenance can be facilitated.

Further, according to the invention of claim 4, since the tool is arranged on a circle passing through the axis of the inner eccentric disc centering on the axis of the outer eccentric disc, the workable range can be expanded.

[0015]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 4 are views for explaining an eccentric table device according to an embodiment of the present invention. FIG. 1 is a sectional side view of the device and is a sectional view taken along the line I-I of FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1, FIG. 3 is a view corresponding to FIG. 2 showing the inclined state of the outer eccentric disc, and FIG. 4 is a schematic view showing the operation.

In the figure, reference numeral 14 is an eccentric table device, and the eccentric table device 14 is a device main body (device fixing portion) 1 and an outer eccentric disc rotatably supported by the device main body 1 around an axis B. 2 and an inner eccentric disc 4 rotatably supported by the outer eccentric disc 2 about an axis A. In the figure, SP is a spindle arranged so as to be movable in the left-right (horizontal) direction in the figure, and a tool T is attached to the tip of the spindle SP. Here, in the present embodiment, the axis of the main shaft SP coincides with the axis A.

The device body 1 has an L-shaped cross section having a support plate portion 1a having a substantially rectangular shape in a front view and a base portion 1b fixed to the external fixing portion 13, and the support plate portion 1a includes A support hole 1c having the axis B as a central axis is formed so as to penetrate therethrough in the horizontal direction.

The outer eccentric disc 2 has a disc shape, is inserted and disposed in the support hole 1c of the support plate portion 1a, and is rotatably supported via a bearing 3. Further, the worm wheel 2 is provided on the rear end of the outer peripheral surface of the outer eccentric disc 2.
b is formed. The worm wheel 2b is meshed with a worm 7a fixed to the output shaft of a swing drive motor 7b constituting the outer eccentric disc drive device 7. The outer eccentric disc drive device 7 supports the device main body 1 as described above. Plate part 1
It is fixed to the back of a. In this way, the outer eccentric disc 2 is swiveled around the axis B by the swivel driving motor 7b.

The outer eccentric disc 2 is formed with a support hole 2a, which is eccentric from the shaft center B by a predetermined distance and has a shaft center A as a central axis, so as to penetrate therethrough in the horizontal direction. The inner eccentric disc 4 is inserted and arranged in the support hole 2a, and is rotatably supported via a bearing 5. Further, a worm wheel 4a forming an inner eccentric disc drive device 8 is meshed with a worm wheel 4b formed at a rear end portion of the outer peripheral surface of the inner eccentric disc 4, and the worm 8a is provided with a rotary drive motor 8b. A timing pulley 8d fixed to the output shaft is connected via a timing belt 8c and a timing pulley 8e. The inner eccentric disc driving device 8 is fixed to the back surface of the outer eccentric disc 2.

An electric chuck 6 is disposed in the inner eccentric disc 4, and a chuck claw 6a of the chuck 6 is provided.
Thus, the work W is held on the front surface of the inner eccentric disc 4. In this case, since the spindle SP, that is, the tool T is aligned with the axis A, the work W1 of the workpiece W is located slightly eccentric from the axis of the outer eccentric disc 2.
The arrangement position of the tool T does not necessarily have to coincide with the axis A, and as shown in FIG. 4, it may be arranged anywhere on the circle D passing through the axis A with the axis B as the center. .

Further, between the support member (device fixing portion side member) 10 provided upright on the base portion 1b and the support member (outer eccentric disc side member) 12 fixed to the outer eccentric disc 2 are provided.
A first rotary power feeding device 9 for supplying electric power and a control signal from the outside to the outer eccentric disc 2 side is arranged. The first rotary power feeding device 9 includes a pair of power feeding cores 9b having a large number of windings.
And a power receiving side core 9a, and a so-called non-contact type in which electric power and control signals are supplied from the power feeding side to the power receiving side in a contactless manner by magnetically coupling both cores 9b and 9a. The power feeding side and power receiving side cores 9b and 9a are both disc-shaped,
They are arranged and fixed to the support members 10 and 12 so as to be coaxial with the axis B and face each other with a predetermined gap.

Furthermore, between the support member 12 fixed to the outer eccentric disc 2 and the support member (inner eccentric disc side member) 4c of the inner eccentric disc 4 from the outside, the first rotary power feeding device 9 is interposed. A second rotary power supply device 11 for supplying electric power and a control signal to the electric chuck 6 in the inner eccentric disc 4 is disposed. The second rotary power feeding device 11 is a non-contact type that includes a pair of power feeding side cores 11b and power receiving side cores 11a, and the power feeding side and power receiving side cores 11b and 11a are all disc-shaped. The support members 12 and 4c are arranged and fixed so as to be coaxial with the axis A and face each other with a predetermined gap. The contactless power supply device is conventionally known as disclosed in, for example, Japanese Patent Application Laid-Open No. 4-345008, and detailed description thereof will be omitted.

Here, in FIG. 1, the alternate long and short dash line (thick line) indicates a power supply lead wire, and the broken line indicates a control signal supply lead wire. The power supply lead wire is controlled by an external power supply device (not shown). The signal supply lead wire is connected to a control device (not shown). The control device sends a turning control signal for controlling the turning angle of the outer eccentric disc 2 to the turning driving motor 7b, and a rotation control signal for controlling the turning angle of the inner eccentric disc 4 to the rotation driving motor 8b. To supply.

Next, the function and effect of this embodiment will be described. In the device of the present embodiment, electric power and control signals are directly supplied to the swing drive motor 7b from the outside, supplied to the rotation drive motor 8b via the first rotary power supply device 9, and inside the inner eccentric disc 4. It is supplied to the electric chuck 6 through the first and second power feeding devices 9 and 11.

Here, as shown in FIG. 4, in order to process the work W as shown by the curve C in the apparatus of this embodiment, the points W2, W3 ... On the curve C are the contact positions with the tool T. The work W is rotated and rotated so as to be positioned at a certain work W1. For example, focusing on the point W2, the rotation driving motor 8b rotationally drives the inner eccentric disc 4 to rotate the point W2 of the work W about the axis A and move it on the circumference E while rotating. 7b
The outer eccentric disc 2 is driven to rotate by the above-mentioned point W2.
Is moved to the processed portion W1 along the circumference F. Assuming that the work is fixed and the tool T moves in order to facilitate understanding of the above operation, the tool T moves to P1 on the circumference D by the turning of the outer eccentric disk 2, and the inner eccentric disk. The rotation of 4 will move to W2 as shown by the arrow. The same applies to the point W3, and the processing along the curve C is performed in this manner. In this case, since the rotation driving motor 8b is fixed to the outer eccentric disc 2 and rotates together with the eccentric disc 2, no relative angular deviation occurs between the inner and outer eccentric discs 4,2.

As described above, in this embodiment, since the swing drive motor 7b is attached to the apparatus main body (apparatus fixing portion) 1 and the rotation drive motor 8b is attached to the outer eccentric disc 2 side, the orthogonal linear drive shafts are used. No configuration is required, and processing accuracy can be improved. Further, since the inner and outer eccentrics 4 and 2 rotate synchronously, the rotation angles of the inner and outer eccentrics can be controlled without employing a complicated differential mechanism, and the drive mechanism can be simplified.

The first rotary power feeding device 9 is disposed between the device fixing portion side member and the outer eccentric disc side member so as to be coaxial with the axis B, and the second rotary power feeding device 11 is outside. Since the eccentric disc side member and the inner eccentric disc side member are arranged so as to be coaxial with the axis A, the rotating outer eccentric disc 2, the inner eccentric disc 4, and the device fixing portion are directly connected by the lead wire. Electric power and control signals can be externally supplied to each motor and the electric chuck without connection. Therefore, since the lead wires to the motor and the like are not entangled, it is not necessary to limit the rotation range of the outer and inner eccentric discs 2 and 4, so that reliability can be improved and maintenance can be facilitated. By the way, if the rotary power supply device is not provided, the rotating member (eccentric disc) and the non-rotating member (device fixing part) will be connected with a long lead wire. In such a case, the entanglement of the lead wire will occur. Inevitably, there is no choice but to limit the rotatable range of the eccentric disc.

FIG. 5 shows a modification of the inner eccentric disc portion.
In this example, the axial center A of the inner eccentric disc 4 is located near the outer periphery of the outer eccentric disc 2 to set a large dimension between A and B, and the inner eccentric disc 4 is formed with a flange 4d. W is fixed. In this example, a workpiece that exceeds the diameter of the inner eccentric disc 4 can be machined, and the maximum machining diameter is A
~ 2 times the B dimension.

In the above embodiment, the electric chuck of the inner eccentric disc 4 is illustrated as an electric actuator of the inner eccentric disc 4, but the present invention is not limited to this. It may be. In the case where a rotary spindle is arranged in the inner eccentric disc 4, the electric chuck 6 is mounted on the spindle, and the rotary spindle is driven by a motor, the workpiece W is turned. The spindle driving motor serves as the electric actuator.

Further, in the above embodiment, the outer and inner eccentric discs 2 and 4 are rotationally driven via the worm and the worm wheel, but any configuration capable of rotational driving may be used, for example, via a spur gear or a timing belt. It may be driven by rotation.

Further, the rotary power feeding device is not limited to the non-contact type, but a contact type such as a slip ring can be adopted.

[0032]

According to the eccentric table device of the first aspect of the present invention, the outer eccentric disc and the inner eccentric disc are directly driven by separate drive motors, respectively, and the inner eccentric disc drive motor is fixed to the outer eccentric disc. Therefore, there is an effect that the processing accuracy can be improved, and that the rotation angles of the inner and outer eccentrics can be controlled without employing a complicated differential mechanism, and the drive mechanism can be simplified. .

According to the eccentric table device of the second aspect of the present invention, the first rotary power feeding device is provided between the device fixing portion side member and the outer eccentric disc side member and coaxial with the axis of the outer eccentric disc. According to the invention of claim 3, the second rotary power feeding device is arranged between the outer and inner eccentric disc side members so as to be coaxial with the axis of the inner eccentric disc. Therefore, electric power can be externally supplied to each of the above motors and electric actuators without directly connecting the rotating outer and inner eccentric discs and the device fixing part with lead wires, and the lead wires to the motor etc. are not entangled. Therefore, it is not necessary to limit the rotation range of the outer and inner eccentrics, and there is an effect that reliability can be improved and maintenance can be facilitated.

According to the invention of claim 4, since the tool is arranged on a circle passing through the axis of the inner eccentric disc with the axis of the outer eccentric disc as the center, there is an effect that the workable range can be expanded.

[Brief description of drawings]

FIG. 1 is a cross-sectional side view (cross-sectional view taken along line I-I of FIG. 2) of an eccentric table device according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a cross-sectional view showing a state in which the outer eccentric disc of the above embodiment is inclined.

FIG. 4 is a schematic diagram for explaining the operation of the above embodiment.

FIG. 5 is a sectional side view showing a modified example of the inner eccentric disc portion in the above embodiment.

[Explanation of symbols]

 1 Device main body (device fixing part) 2 Outer eccentric disc 4 Inner eccentric disc 6 Electric chuck 7b Swing drive motor 8b Rotation drive motor 9 First rotation power supply device 11 Second rotation power supply device 14 Eccentric table device A Inner eccentric disc Shaft center B Shaft center of outer eccentric board W Workpiece W1 Workpiece part

Claims (4)

[Claims] 1. An inner eccentric disc on which a work is mounted is rotatably disposed at a position eccentric from the axis of the outer eccentric disc, and the outer eccentric disc is rotatably supported by a device fixing portion.
In an eccentric table device that rotates a workpiece part around an axis of an outer eccentric disc while rotating the workpiece eccentric disc about an axis of the inner eccentric disc, a swivel drive for pivotally driving the outer eccentric disc to the device fixing part. An eccentric table device characterized in that a motor for driving is fixed, and a rotation driving motor for rotationally driving the inner eccentric is fixed to the outer eccentric. 2. The first eccentric power feeding device for supplying electric power to the rotation driving motor from the outside according to claim 1, wherein the outer eccentricity is provided between the device fixing part side member and the outer eccentric disc side member. An eccentric table device arranged so as to be coaxial with the axis of the board. 3. The second rotary power feeding device for supplying electric power to the electric actuator of the inner eccentric disc from the outside according to claim 1 or 2, between the outer eccentric disc side member and the inner eccentric disc side member. An eccentric table device arranged so as to be coaxial with the axis of the inner eccentric disc. 4. An inner eccentric disc on which a work is mounted is rotatably disposed at a position eccentric from the axial center of the outer eccentric disc, and the outer eccentric disc is rotatably supported by a device fixing portion.
In an eccentric table device for rotating a work piece of a workpiece around the axis of the outer eccentric disc while rotating it around the axis of the inner eccentric disc, the tool is eccentric to the inner eccentric disc. An eccentric table device arranged on a circle passing through the axis of the board.