Tilting Rotating Table Device

Abstract

To provide an inclined rotary table device 1 of high accuracy.SOLUTION: An inclined rotary table device 1 includes a rotary table device 3 having a rotary table device 103 and a rotary table 30 for inclining a table surface of a rotary table 130. The rotary table device is installed on the rotary table such that a direction along a central axis Zb of the rotary table crosses a direction along a central axis Za of the rotary table. The rotary table device has a rotary shaft 32 which is provided in a central portion of the rotary table and integrally rotates with the rotary table. The rotary shaft has an extension part 32b extending to the opposite side of the rotary table device when viewed from the rotary table. The extension part is provided with a balance weight 200 for achieving a balance with the rotary table device, a center of gravity P2 of the balance weight being positioned at a position separated in the radial direction of the rotary shaft from a central position of the rotary shaft.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a tilting and rotating table device. [Background technology]

[0002] As automation of machining on machine tools and the like progresses, the use of a two-axis rotating device that rotates on two orthogonal axes on the table of the machine tool, i.e., an NC tilting rotary table device, is used to give two-axis rotation to the workpiece set on the rotary table, reducing the number of setups during complex machining and machining, and improving productivity. In particular, in recent years, there has been an increasing demand for mold and high-precision part machining, and there is a demand for highly productive NC tilting rotary tables (generally tilting table devices). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-056508 Summary of the Invention [Problem to be solved by the invention]

[0004] Recently, there has been an increasing demand for improved accuracy in the tilting table devices described above. However, when a workpiece is set on the rotating table of a tilting table device, the large eccentric load of the tilting table is added to the eccentric load of the workpiece, and as the tilting axis rotates, the rotational moment (rotational static torque) fluctuates greatly, resulting in a decrease in the rotational position accuracy of the tilting axis in particular.

[0005] The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a highly accurate tilting and rotating table device. [Means for solving the problem]

[0006] The main invention to achieve the above object is: a rotary table device having a rotary table and a rotary table driving unit that drives the rotary table; a rotating table device including a rotating table that rotates to swing the rotating table device and tilt the table surface of the rotating table, and a rotating table driving unit that drives the rotating table, a tilting rotary table device attached to the rotary table such that a direction along a central axis of the rotary table intersects with a direction along a central axis of the rotating table, the rotating table device has a rotating shaft that is provided at the center of the rotating table and rotates integrally with the rotating table, the rotating shaft having an extension that extends to a side opposite to the rotating table device as seen from the rotating table, The extension portion is provided with a balance weight for balancing with the rotary table device, and the center of gravity of the balance weight is located at a position away from the center position of the rotary shaft in the radial direction of the rotary shaft. Located a support bearing that includes a rolling element and rotatably supports the rotary table; from the center of gravity of the rotary table device to an intersection of a cross section of the rotating table that is parallel to the table surface of the rotating table and passes through the center of gravity of the rolling body and a central axis of the rotating table, The imaginary extension of the imaginary straight line intersects with the balance weight. The tilting and rotating table device is characterized by the above.

[0007] Other features of the present invention will become apparent from the description of this specification and the accompanying drawings. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a highly accurate tilting and rotating table device. [Brief explanation of the drawings]

[0009] [Figure 1]The schematic side view and the schematic rear view of the inclining and rotating table device 1 according to this embodiment show the rotating table device 3 in a schematic BB cross section (see FIG. 3), the rotating table device 103 in a schematic FF cross section (see FIG. 6), and the balance weight 200 in a side view (non-cross section). The schematic rear view shows a rear view (non-cross section). [Figure 2] 1, showing a schematic plan view (non-sectional view) of the rotating table device 3. FIG. [Figure 3] 2, and the schematic cross-sectional view taken along the lines B-B and CC shows cross sections of the rotary table 30, rotary shaft 32, and first support bearing 34. In the schematic cross-sectional view taken along the lines B-B, hidden parts are not shown, but for ease of understanding, the hidden parts of the input-side first output table 20, input-side first cam follower 20a, and rotary shaft 32 are shown with dashed lines. The first intermediate bearing 26 (see FIG. 4) is not shown. The number of output-side first cam followers 30a is omitted and only one is shown. [Figure 4] FIG. 4 is a schematic cross-sectional view of FIG. 3 taken along the line DD. [Figure 5] 1, showing a schematic plan view (non-sectional view) of the rotary table device 103. [Figure 6] 5, which show the cross sections of the rotary table 130, rotary shaft 132, and second support bearing 134. Hidden parts are not shown in the FF cross section, but for ease of understanding, the hidden parts of the input-side second output table 120, input-side second cam follower 120a, and rotary shaft 132 are indicated by dashed lines. The second intermediate bearing 126 (see FIG. 7) is not shown. The number of output-side second cam followers 130a is omitted and only one is shown. [Figure 7] FIG. 7 is a schematic cross-sectional view of FIG. 6 . [Figure 8]This figure corresponds to the schematic side view of Figure 1 and is an explanatory diagram for explaining the arrangement of the balance weight 200. In the schematic BB cross section of the rotating table device 3, the rolling element 34a shown in the schematic CC cross section is shown to explain the position of the intersection point P0. [Figure 9] 10 is an explanatory diagram for explaining a rotation moment generated in the rotary table 30 when the rotary table 130 is tilted. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0010] At least the following matters will become clear from the description of this specification and the accompanying drawings.

[0011] 1. A tilting rotary table device comprising: a rotary table device having a rotary table and a rotary table driver that drives the rotary table; a rotary table device having a rotary table that rotates to oscillate the rotary table device and tilt the table surface of the rotary table, and a rotary table driver that drives the rotary table; wherein the rotary table device is attached to the rotary table so that a direction along the central axis of the rotary table intersects a direction along the central axis of the rotary table; the rotary table device has a rotation shaft that is provided in the center of the rotary table and rotates integrally with the rotation table, the rotation shaft has an extension that extends to the opposite side of the rotary table device from the turntable; a balance weight is provided on the extension to balance the rotary table device; and the center of gravity of the balance weight is located at a position radially away from the center of the rotation shaft.

[0012] With such a tilting rotary table device, the balance weight rotates simultaneously with the rotary table device, so that the rotational moment of the rotating table generated by the rotary table device is offset by the rotational moment generated by the balance weight and becomes smaller, thereby providing a highly accurate tilting rotary table device.

[0013] In such an inclined rotary table device, it is desirable that the rotary table includes a cam follower, and the rotary table driving section includes a barrel cam that engages with the cam follower.

[0014] In this type of tilting rotary table device, the barrel cam has a larger diameter rotating table than a roller gear cam for the same size device, and the rotation moment is larger. Therefore, the effect of reducing the rotation moment of the rotary table device by the rotation moment of the balance weight is more effectively exhibited than in the case of, for example, a roller gear cam.

[0015] In such a tilting rotary table device, it is desirable that one end of the rotary table device is attached to the rotary table, and the other end opposite to the one end is a free end.

[0016] With such a tilting and rotating table device, the rotating table device is in a cantilevered state, so the effect of suppressing tilting of the tilting and rotating table device by the balance weight is more effectively exerted than in the case of, for example, a double-supported state.

[0017] It is desirable that such an inclined rotating table device has rolling elements and a support bearing that rotatably supports the rotating table, and that the balance weight intersects with an imaginary extension of an imaginary line drawn from the center of gravity of the rotating table device to the intersection of the rotating table cross section that is parallel to the table surface of the rotating table and passes through the center of gravity of the rolling elements and the central axis of the rotating table.

[0018] According to such an inclined rotary table device, the position at which the rotation moment generated in the rotary table is generated can be brought closer to the intersection point, so that the rotation moment of the rotary table can be suppressed.

[0019] In such a tilting rotary table device, when the weight of the rotary table device is M1, the weight of the balance weight is M2, and the length of the virtual line is L1, it is desirable that a virtual point on the virtual extension line that is a distance L2 = M1 × L1 / M2 away from the intersection point is located inside the balance weight.

[0020] According to such an inclined rotating table device, by providing a balance weight so that L2 is positioned inside, the position where the rotation moment generated in the rotating table is generated can be brought closer to the intersection point, thereby suppressing the rotation moment of the rotating table.

[0021] In such a tilting rotating table device, it is desirable that the rotating table device has a housing that accommodates the rotating table, the rotating table drive unit, and the rotating shaft, a portion of the extension part of the rotating shaft protrudes outside the housing, and the virtual point is located outside the housing.

[0022] With such a tilting and rotating table device, the imaginary point is located outside the housing, so that the balance weight can be provided outside the housing, and therefore there is no limit to the size of the balance weight, and a large balance weight can be provided.

[0023] In such an inclined rotating table device, the rotating table device has a housing that accommodates the rotating table, the rotating table drive unit, and the rotating shaft, and it is desirable that a portion of the extension portion of the rotating shaft protrudes outside the housing, and that the balance weight be provided on the portion of the extension portion that protrudes outside the housing.

[0024] In such a tilting and rotating table device, the balance weight is located outside the housing of the rotating table device, so there is no limit to the size of the balance weight, and a large balance weight can be provided.

[0025] In such a tilting rotary table device, when the tilting rotary table device is in an inoperative state, it is desirable that the upper surface of the rotary table be located below the center position of the rotation axis, and the lower end of the balance weight be located above the center position of the rotation axis.

[0026] With this type of tilting rotary table device, the rotational moment generated by the rotary table can be offset compared to when the balance weight is positioned below the rotation axis, thereby reducing the rotational moment generated in the rotary table.

[0027] ===About the tilting rotary table device 1=== The tilting and rotating table device 1 according to this embodiment will be described with reference to the drawings. FIG. 1 shows a schematic side view and a schematic rear view of the tilting and rotating table device 1 according to this embodiment, with the left view being the schematic side view and the right view being the schematic rear view (view of the tilting and rotating table device 1 as seen from the right side). The schematic side view shows the rotating table device 3 in a schematic B-line cross section (see FIG. 3), the rotating table device 103 in a schematic F-line cross section (see FIG. 6), and the balance weight 200 in a side view (non-cross section). The schematic rear view shows a rear view (non-cross section). Note that in the drawings according to this embodiment, appropriate components may be omitted in some cases to make the present invention easier to understand.

[0028] The inclining and rotating table device 1 according to this embodiment has an X direction, a Y direction, and a Z direction, with the X direction and the Y direction intersecting each other and the Z direction intersecting both the X direction and the Y direction. The horizontal direction of the paper in the schematic side view of Fig. 1 is the X direction, and the left side (right side) of the paper is called the left (right). The vertical direction of the paper is the Z direction (vertical direction), and the upper side (lower side) of the paper is called the top (bottom). The horizontal direction of the paper in the schematic back view of Fig. 1 is the Y direction, and the left side (right side) of the paper is called the front (rear).

[0029] The tilting and rotating table device 1 according to this embodiment is a machine tool generally called a tilt table, which indexes a workpiece or the like by tilting the tilt table to perform predetermined machining. The maximum tilt angle θ of a typical tilt table is 100 to 120 degrees.

[0030] The inclined rotating table device 1 has two devices (a rotating table device 3 as the first device and a rotating table device 103 as the second device) and a balance weight 200. On the left side of the rotating table device 3, the rotating table device 103 is attached to the rotating table 30 with a bolt 103a and a positioning pin (not shown), and on the right side of the rotating table device 3, a balance weight 200 is attached to balance the rotating table device 103.

[0031] When the inclined rotary table device 1 is in an inoperative state, the upper surface 130b of the rotary table 130 is located below the center position (center axis Za) of the rotary shaft 32, and the lower end 200a of the balance weight 200 is located above the center position (center axis Za) of the rotary shaft 32.

[0032] The rotating table device 3 has a rotating table 30 (see Figure 9) that rotates to oscillate the rotating table device 103 and tilt the table surface 130c of the rotating table 130 of the rotating table device 103, and a rotating table drive unit that drives the rotating table 30.

[0033] The rotary table device 103 has a rotary table 130 and a rotary table driving unit that drives the rotary table 130. In other words, since the rotary table 130 rotates in addition to the rotating table 30, the inclined rotary table device 1 is an inclined rotary table device 1 that has two central axes (rotation axes) of the rotating table 30 and the rotary table 130, namely central axis Za and central axis Zb.

[0034] The rotating table device 103 is attached to the rotating table 30 so that the direction along the central axis Zb of the rotating table 130 intersects with the direction along the central axis Za of the rotating table 30. This allows the two-axis tilting rotating table device 1 to function as a general tilt table.

[0035] Furthermore, the rotary table device 103 according to this embodiment is attached to the rotating table 30 in a cantilevered state. That is, one end 103b (right end) of the rotary table device 103 is attached to the rotating table 30, and the other end 103c (left end) opposite to the one end is a free end. Although the rotary table device 103 according to this embodiment is attached to the rotating table 30 in a cantilevered state, this is not limiting, and it may be configured so that both ends (left and right ends) are supported.

[0036] <<<About the rotating table device 3>>> The rotating table device 3 will be described with reference to the drawings. Fig. 2 is a schematic plan view (non-sectional view) of the rotating table device 3, taken along arrow A in Fig. 1, and Fig. 3 is a schematic cross-sectional view taken along lines BB and CC in Fig. 2, with the CC cross-sectional view showing cross sections of the rotating table 30, the rotating shaft 32, and the first support bearing 34. Fig. 4 is a schematic cross-sectional view taken along line DD in Fig. 3.

[0037] In the schematic B-B cross-sectional view, hidden parts are not shown, but to make the drawing easier to understand, the hidden parts of the input-side first output table 20, input-side first cam follower 20a, and rotating shaft 32 are shown with dashed lines. The first intermediate bearing 26 is not shown. The number of output-side first cam followers 30a is omitted and only one is shown.

[0038] As described above, the rotating table device 3 has the rotating table 30 and a rotating table driving unit that rotates the rotating table 30.

[0039] The rotating table driving unit (first device) has a first motor 10 as a power source, and is a device that rotates the rotating table 30 at a rotation speed lower than that of the first motor 10 (a decrease in rotation speed results in an increase in output torque). A two-stage cam mechanism consisting of an input-side first cam 14 and an output-side first cam 24 (corresponding to a barrel cam) is used as a mechanism for reducing the rotation speed of the first motor 10.

[0040] The rotating table device 3 has a first housing 5 (corresponding to a housing), and inside the first housing 5, there are accommodated a first motor 10, a first input shaft 12, an input side first cam 14, an input side first output table 20, a first intermediate shaft 22, an output side first cam 24 (the components from the first motor 10 to the output side first cam 24 correspond to the rotating table drive unit), a rotating table 30, and a rotating shaft 32 (inclined shaft).

[0041] The first motor 10 is provided so that its rotation axis is along the Z direction, and is connected to the first input shaft 12 by a first coupling 16.

[0042] The first input shaft 12 is provided along the Z direction and is rotatably supported by a first input bearing 18. The upper side of the first input shaft 12 extends above the first input bearing 18, and this extending portion is connected to the rotating shaft of the first motor 10 by a first coupling 16.

[0043] The first input shaft 12 is provided at both the upper and lower ends of the first input cam 14 in the Z direction, and the first input cam 14 and the first input shaft 12 rotate integrally.

[0044] The first input cam 14 is a barrel cam and has a first input cam groove 14a, which is spiral and provided along the direction of the first input shaft 12. By engaging a first input cam follower 20a of a first input output table 20 (described later) with the first input cam groove 14a, the rotation of the first input cam 14 is transmitted to the first input output table 20. The first input shaft 12 and the first input cam 14 may be formed as separate pieces and then joined together to form an integrated unit, or may be formed by forming a cam groove on an integrally formed shaft-shaped piece.

[0045] The input-side first output table 20 has a circular shape and is provided with a plurality of input-side first cam followers 20a that engage with the input-side first cam 14 (input-side first cam groove 14a), and rotates around a first intermediate shaft 22 that runs along the Y direction as the input-side first cam 14 rotates around the first input shaft 12 that runs along the Z direction. In other words, the directions of the rotation axes on the input side (input-side first cam 14) and the output side (input-side first output table 20) are perpendicular to each other (changing from the Z direction to the Y direction).

[0046] The input-side first cam follower 20a is a part that engages with the input-side first cam groove 14a, and is a cylindrical rotatable rotating body that is provided so that the rotation axis direction is along the Y direction. A plurality of input-side first cam followers 20a are provided at equal intervals along a circle centered on the rotation center of the input-side first output table 20. In this embodiment, 12 input-side first cam followers 20a are provided at equal intervals (every 30 degrees).

[0047] In addition, the input side first cam follower 20a engages with the input side first cam groove 14a of the input side first cam 14 on the front side of the input side first output table 20, and this engaged input side first cam follower 20a rotates and moves while being guided by the input side first cam groove 14a.

[0048] Specifically, when the input-side first cam 14 rotates clockwise as viewed from above, the engaged input-side first cam follower 20a is guided by the spiral input-side first cam groove 14a and moves from the top to the bottom along the circumferential direction of the input-side first output table 20. In other words, the input-side first output table 20 rotates clockwise as viewed from the front side.

[0049] In order to achieve high precision in the rotation of the input side first output table 20, i.e., to achieve high precision output, the input side first cam follower 20a and the input side first cam groove 14a are engaged with high precision so as to prevent backlash, misalignment, rattle, etc. (The engagement method for achieving high precision output from the cam mechanism is a well-known technology, so an explanation will be omitted here).

[0050] The first intermediate shaft 22 is provided along the Y direction and is rotatably supported by a first intermediate bearing 26. The input-side first output table 20 is connected to the front side of the first intermediate shaft 22 (the input-side first output table 20 is provided at the end of the first intermediate shaft 22 in the Y direction (the front end in this embodiment)), and the input-side first output table 20 and the first intermediate shaft 22 rotate integrally. In other words, the first intermediate shaft 22 is provided along the Y direction and connected to the input-side first output table 20, and rotates in conjunction with the rotation of the input-side first output table 20.

[0051] The first intermediate shaft 22 is provided on both ends of the first output cam 24, on the front and rear sides in the Y direction, and the first output cam 24 and the first intermediate shaft 22 rotate integrally.

[0052] The first output cam 24 has a first output cam groove 24a, and the spiral first output cam groove 24a is provided along the direction of the first intermediate shaft 22. Then, by engaging a first output cam follower 30a (corresponding to a cam follower) of a rotating table 30 (output side rotating table) with the first output cam groove 24a, the rotation of the first output cam 24 is transmitted to the rotating table 30. That is, the rotating table 30 has the first output cam follower 30a, and the rotating table driving unit has the first output cam 24 that engages with the first output cam follower 30a. Note that a specific description of power transmission and the like is the same as the description of the first input cam groove 14a and the first input cam follower 20a described above, and will not be repeated here.

[0053] The normal direction of the rotating table 30 is along the X direction which intersects both the Z direction and the Y direction, and the rotating table 30 is rotatably supported by a first support bearing 34 (corresponding to a support bearing). The rotating table 30 is provided with a plurality of first output cam followers 30a which engage with the first output cam 24 (first output cam groove 24a), and rotates around the X direction as the first output cam 24 along the Y direction rotates.

[0054] In this embodiment, the first support bearing 34 is a large-diameter four-point support ball bearing, which is provided with spherical rolling elements 34a and supports the rotary table 30 so that the rotary table 30 can rotate.

[0055] The first output cam follower 30a is a part that engages with the first output cam groove 24a, and is a cylindrical rotating body that can rotate on its own axis, with the rotation axis direction aligned with the X direction. A plurality of first output cam followers 30a are provided at equal intervals along a circle centered on the rotation center of the rotating table 30. In this embodiment, 16 first output cam followers 30a are provided at equal intervals (every 22.5 degrees).

[0056] The rotation shaft 32 is connected to the rotation table 30 in the center of the rotation table 30 along the X direction and rotates in conjunction with the rotation of the rotation table 30. In other words, the rotation shaft 32 is provided at the center of the rotation table 30 and rotates integrally with the rotation table 30.

[0057] The rotary shaft 32 has an inner-table portion 32a located in the hollow portion of the rotary table 30, and an extension portion 32b extending to the opposite side (right side) of the rotary table device 103. The extension portion 32b extends to the outside of the first housing 5 (beyond the right end 5a of the first housing 5). In other words, a part of the extension portion 32b forms a protruding portion 32c that protrudes outside the first housing 5.

[0058] Furthermore, the rotation shaft 32 may be one that does not have a hollow portion in the center (a solid shaft), but the rotation shaft 32 according to this embodiment is a so-called hollow shaft that has a hollow portion.

[0059] <<<About the Rotary Table Device 103>>> The rotary table device 103 will be described with reference to the drawings. Fig. 5 is a schematic plan view of the rotary table device 103, taken along arrow E in Fig. 1, and Fig. 6 is a schematic FF cross-sectional view and a schematic GG cross-sectional view of Fig. 5, with the GG cross-sectional view showing cross sections of the rotary table 130, the rotary shaft 132, and the second support bearing 134. Fig. 7 is a schematic HH cross-sectional view of Fig. 6.

[0060] In the FF cross-sectional schematic diagram, hidden parts are not shown, but to make the drawing easier to understand, the hidden parts of the input-side second output table 120, input-side second cam follower 120a, and rotating shaft 132 are shown with dashed lines. The second intermediate bearing 126 is not shown. The number of output-side second cam followers 130a is omitted and only one is shown.

[0061] As described above, the rotary table device 103 has the rotary table 130 and a rotary table driving unit that rotates the rotary table 130.

[0062] The rotary table driving unit (second device) has a second motor 110 as a power source, and is a device that rotates the rotary table 130 at a rotation speed lower than that of the second motor 110 (a reduction in the rotation speed results in an increase in output torque). A two-stage cam mechanism consisting of an input-side second cam 114 and an output-side second cam 124 is used as a mechanism for reducing the rotation speed of the second motor 110.

[0063] The rotary table device 103 has a second housing 105, and inside the second housing 105, there are accommodated a second motor 110, a second input shaft 112, an input side second cam 114, an input side second output table 120, a second intermediate shaft 122, an output side second cam 124 (the components from the second motor 110 to the output side second cam 124 correspond to the rotary table driving unit), a rotary table 130, and a rotary shaft 132.

[0064] The second motor 110 is provided so that its rotation axis is along the X direction, and is connected to a second input shaft 112 by a second coupling .

[0065] The second input shaft 112 is provided along the X direction and is rotatably supported by a second input bearing 118. The right side of the second input shaft 112 extends further to the right than the second input bearing 118, and this extending portion is connected to the rotating shaft of the second motor 110 by a second coupling 116.

[0066] The second input shaft 112 is provided on both the left and right ends of the input-side second cam 114 in the X direction, and the input-side second cam 114 and the second input shaft 112 rotate integrally.

[0067] The second input cam 114 is a barrel cam and has a second input cam groove 114a, which is spiral and provided along the direction of the second input shaft 112. By engaging a second input cam follower 120a of the second input output table 120 (described later) with the second input cam groove 114a, the rotation of the second input cam 114 is transmitted to the second input output table 120. The second input shaft 112 and the second input cam 114 may be formed as separate pieces and then joined together to form an integrated unit, or may be formed by forming a cam groove on an integrally formed shaft-shaped piece.

[0068] The input side second output table 120 has a circular shape and is provided with a plurality of input side second cam followers 120a that engage with the input side second cam 114 (input side second cam groove 114a), and rotates around a second intermediate shaft 122 that runs along the Y direction as the input side second cam 114 rotates around the second input shaft 112 that runs along the X direction.

[0069] The input-side second cam follower 120a is a part that engages with the input-side second cam groove 114a, and is a cylindrical rotatable rotating body that is provided so that the rotation axis direction is along the Y direction. A plurality of input-side second cam followers 120a are provided at equal intervals along a circle centered on the rotation center of the input-side second output table 120. In this embodiment, 12 input-side second cam followers 120a are provided at equal intervals (every 30 degrees).

[0070] In addition, the input side second cam follower 120a engages with the input side second cam groove 114a of the input side second cam 114 on the front side of the input side second output table 120, and this engaged input side second cam follower 120a rotates and moves while being guided by the input side second cam groove 114a.

[0071] Specifically, when the input-side second cam 114 rotates clockwise as viewed from the right side, the engaged input-side second cam follower 120a is guided by the spiral input-side second cam groove 114a and moves from right to left along the circumferential direction of the input-side second output table 120. In other words, the input-side second output table 120 rotates clockwise as viewed from the front side.

[0072] In order to achieve high precision in the rotation of the input side second output table 120, i.e., to achieve high precision output, the input side second cam follower 120a and the input side second cam groove 114a are engaged with high precision so as to prevent backlash, misalignment, rattle, etc.

[0073] The second intermediate shaft 122 is provided along the Y direction and is rotatably supported by a second intermediate bearing 126. The input-side second output table 120 is connected to the front side of the second intermediate shaft 122 (the input-side second output table 120 is provided at the end of the second intermediate shaft 122 in the Y direction (the front end in this embodiment)), and the input-side second output table 120 and the second intermediate shaft 122 rotate integrally. In other words, the second intermediate shaft 122 is provided along the Y direction and connected to the input-side second output table 120, and rotates in conjunction with the rotation of the input-side second output table 120.

[0074] The second intermediate shaft 122 is provided on both ends of the output-side second cam 124, on the front and rear sides in the Y direction, and the output-side second cam 124 and the second intermediate shaft 122 rotate integrally.

[0075] The second output cam 124 is a barrel cam and has a second output cam groove 124a, which is spiral and extends in the direction of the second intermediate shaft 122. The second output cam groove 124a is engaged with a second output cam follower 130a of the turntable 130 (output turntable), thereby transmitting the rotation of the second output cam 124 to the turntable 130. Note that a specific description of power transmission and the like is the same as that for the second input cam groove 114a and the second input cam follower 120a described above, and will not be repeated here.

[0076] The normal direction of the rotary table 130 is along the Z direction, which intersects both the X direction and the Y direction, and the rotary table 130 is rotatably supported by a second support bearing 134. The rotary table 130 is provided with a plurality of second output cam followers 130a that engage with the second output cam 124 (second output cam groove 124a), and rotates around the Z direction as the second output cam 124 along the Y direction rotates.

[0077] The output-side second cam follower 130a is a part that engages with the output-side second cam groove 124a, and is a cylindrical rotating body that can rotate on its own axis, and is provided so that the rotation axis direction is along the Z direction. A plurality of output-side second cam followers 130a are provided at equal intervals along a circle centered on the rotation center of the turntable 130. In this embodiment, 16 output-side second cam followers 130a are provided at equal intervals (every 22.5 degrees).

[0078] The rotary shaft 132 is connected to the rotary table 130 at the center of the rotary table 130 along the Z direction, and rotates as the rotary table 130 rotates.

[0079] Furthermore, the rotating shaft 132 may be one without a hollow portion in the center (a solid shaft), but the rotating shaft 132 according to this embodiment is a so-called hollow shaft having a hollow portion. The rotating shaft 132 can also be omitted. In other words, the inclining rotary table device 1 of this embodiment can be configured such that the rotating table 130 serves as the output shaft (a table-type output shaft) and the rotating shaft 132 is not provided.

[0080] <<<About the placement of the balance weight 200>>> Next, the arrangement of the balance weight 200 will be explained using the drawings. Figure 8 is a diagram equivalent to the schematic side view of Figure 1, and is an explanatory diagram for explaining the arrangement of the balance weight 200. The schematic BB cross section of the rotating table device 3 includes the rolling element 34a shown in the schematic CC cross section to explain the position of the intersection P0.

[0081] As already mentioned, the balance weight 200 is located on the right side of the rotating table device 3, and is fixed to the extending portion 32b of the rotating shaft 32 on the right side of the rotating table device 3. In other words, the balance weight 200 is provided on the extending portion 32b to balance the rotating table device 103. The balance weight 200 is also provided on the protruding portion 32c of the extending portion 32b, which is the portion that protrudes outside the first housing 5.

[0082] The center of gravity P2 of the balance weight 200 is located above the central axis Za of the rotating shaft 32 (rotating table 30). In other words, the center of gravity of the balance weight 200 is located at a position away from the center position of the rotating shaft 32 in the radial direction of the rotating shaft 32.

[0083] Furthermore, if the point where a cross section of the rotating table (a cross section parallel to the table surface of the rotating table 30 at the position indicated by the broken line) that is parallel to the table surface 30b of the rotating table 30 and passes through the center of gravity 34ac of the rolling element 34a intersects with the central axis Za of the rotating table 30 is defined as an intersection P0, then the balance weight 200 intersects with an extension of an imaginary line that connects the intersection P0 with the center of gravity P1 of the rotating table device 103. In other words, the balance weight 200 intersects with an imaginary extension (an extension line indicated by reference symbol L2) of an imaginary line (a line indicated by reference symbol L1) drawn from the center of gravity P1 of the rotating table device 103 to the intersection P0 between the cross section of the rotating table that is parallel to the table surface of the rotating table 30 and passes through the center of gravity 34ac of the rolling element 34a and the central axis Za of the rotating table 30. Here, the imaginary extension line intersects with the balance weight 200 means that the imaginary extension line passes through the inside of the balance weight 200, not the outside.

[0084] Furthermore, when the weight of the rotary table device 103 is M1, the weight of the balance weight is M2, and the length of an imaginary line drawn from the center of gravity P1 to the intersection point P0 is L1, an imaginary point on the imaginary extension line that is a distance L2 = M1 × L1 / M2 away from the intersection point P0 is located inside the balance weight 200.

[0085] In other words, the balance weight 200 is provided so that the imaginary point is located somewhere inside the balance weight 200. In this embodiment, the balance weight 200 is provided so that the position of the imaginary point is located at the position of the center of gravity P2 of the balance weight 200.

[0086] In other words, the value of L1×M1 obtained by multiplying the length of the straight line L1 between the intersection point P0 and the center of gravity P1 of the rotary table device 103 by the weight M1 of the rotary table device 103 is equal to the value of L2×M2 obtained by multiplying the length of the straight line L2 between the intersection point P0 and the center of gravity P2 of the balance weight 200 by the weight M2 of the balance weight. This position of the balance weight 200 is an example of an appropriate position (balanced position) of the balance weight 200 with respect to the rotary table device 103 in the inclined rotary table device 1.

[0087] Furthermore, the imaginary point is located outside the first housing 5, not inside the first housing 5. In other words, the balance weight 200 is located outside the first housing 5, to the right of the right end 5a, rather than inside the first housing 5.

[0088] <<<About the effectiveness of the tilting and rotating table device 1>>> As described above, the inclined rotary table device 1 according to this embodiment includes a rotary table device 103 having a rotary table 130 and a rotary table driving unit that drives the rotary table 130, a rotating table 30 that rotates to oscillate the rotary table device 103 and tilt the table surface of the rotary table 130, and a rotating table device 3 having a rotating table driving unit that drives the rotating table 30, and the rotating table device 103 is rotated so that the direction along the central axis Zb of the rotary table 130 intersects with the direction along the central axis Za of the rotating table 30. The tilting and rotating table device 1 is attached to a table 30, and the tilting and rotating table device 3 has a rotation shaft 32 that is provided in the center of the rotation table 30 and rotates integrally with the rotation table 30, and the rotation shaft 32 has an extension 32b that extends to the opposite side of the rotation table device 103 when viewed from the rotation table 30, and a balance weight 200 is provided on the extension 32b to balance with the rotation table device 103, and the center of gravity of the balance weight 200 is located at a position away from the center position (center axis Za) of the rotation shaft 32 in the radial direction of the rotation shaft 32. Therefore, a highly accurate tilting and rotating table device 1 can be provided.

[0089] 9 is an explanatory diagram for explaining the rotation moment generated in the rotating table 30 when the rotating table 130 is tilted. Note that, as an example, Fig. 9 shows an example in which the tilting rotating table device 103 is rotated 45 degrees clockwise and the rotating table 130 is tilted when the tilting rotating table device 103 is viewed from the front (viewing the tilting rotating table device 1 from the left side).

[0090] When the rotary table device 103 is rotated 45 degrees clockwise as viewed from the front, a rotation moment is generated in the rotary table 30 by the rotary table device 103 and the balance weight 200 .

[0091] On the rotating table device 103 side, the weight M1 of the rotating table device 103 can be considered to be acting on the center of gravity P1 of the rotating table device 103, so a rotational moment is generated on the rotating table 30 in a counterclockwise direction when viewed from the front, the rotational moment being the distance from the central axis Za of the rotating table 30 to the center of gravity P1 of the rotating table device 103 multiplied by the weight M1 × Sin45°.

[0092] On the other hand, on the balance weight 200 side, it can be assumed that the weight M2 of the balance weight 200 is acting on the center of gravity P2 of the balance weight 200, so a rotational moment is generated in the rotating table 30 in a clockwise direction when viewed from the front, the rotational moment being the distance from the central axis Za of the rotating table 30 to the center of gravity P2 of the balance weight 200 multiplied by the weight M2 × Sin45°.

[0093] In other words, by rotating the balance weight 200 simultaneously with the rotating table device 103, the rotation moment of the rotating table 30 generated by the rotating table device 103 is offset by the rotation moment generated by the balance weight 200 and becomes smaller, thereby improving the rotation position accuracy of the rotating table 30 and providing a highly accurate inclined rotating table device 1.

[0094] Furthermore, the weight M1 of the rotating table device 103 makes the tilting rotating table device 1 prone to tilting toward the rotating table device 103 (left side), but by providing the balance weight 200 on the right side of the tilting rotating table device 1, it is possible to suppress this tilt due to the weight M2 of the balance weight 200. In other words, the tilting of the tilting rotating table device 1 due to the rotating table device 103 can be suppressed by the balance weight 200.

[0095] In the above embodiment, the rotating table 30 includes the first output cam follower 30a, and the rotating table driving unit includes the first output cam 24 (barrel cam) that engages with the first output cam follower 30a.

[0096] In the cam mechanism, the cam followers of the barrel cam are arranged concentrically on the underside of the output table, while the cam followers of the roller gear cam are arranged radially on the side of the output table. Therefore, when comparing cam devices of the same size, the barrel cam device has a larger diameter output table than the roller gear cam device.

[0097] In other words, because the output-side first cam 24 is a barrel cam, the diameter of the rotary table 30 is larger than that of a roller gear cam for a device of the same size, and the rotational moment is larger. Therefore, the effect of the rotational moment of the balance weight 200 canceling out and reducing the rotational moment of the rotary table device 103 is more effectively exhibited than in the case of, for example, a roller gear cam.

[0098] In the above embodiment, one end of the rotary table device 103 is attached to the rotating table 30, and the other end opposite to the one end is a free end. As a result, the rotary table device 103 is in a cantilevered state, and the effect of suppressing tilting of the tilting rotary table device 1 by the balance weight 200 is more effectively exerted than in the case of, for example, a double-supported state.

[0099] Furthermore, by using a cantilevered structure, it becomes easier to load and set the workpiece, visually check the machining, unload, clean up chips, etc., improving workability and operability.

[0100] In addition, in the above embodiment, the rotary table device 103 has a first support bearing 34 equipped with rolling elements 34a that rotatably supports the rotary table 30, and the balance weight 200 intersects with an imaginary extension line of an imaginary straight line drawn from the center of gravity of the rotary table device 103 to an intersection P0 between the rotary table cross section that is parallel to the table surface of the rotary table 30 and passes through the center of gravity of the rolling elements 34a and the central axis Za of the rotary table 30.

[0101] This allows the balance weight 200 to be provided in a more appropriate position with good balance compared to when the imaginary extension of the imaginary straight line does not intersect with the balance weight 200.

[0102] In addition, in the above embodiment, when the weight of the rotary table device 103 is M1, the weight of the balance weight 200 is M2, and the length of the virtual line is L1, a virtual point on the virtual extension line that is a distance L2 = M1 × L1 / M2 away from the intersection point P0 is located inside the balance weight.

[0103] This allows the balance weight 200 to be provided in a more appropriate position for better balance than when the imaginary point is located outside the balance weight 200.

[0104] In addition, in the above embodiment, the rotating table device 3 has a first housing 5 that accommodates the rotating table 30, the rotating table drive unit, and the rotating shaft 32, and a portion of the extension portion 32b of the rotating shaft 32 protrudes outside the first housing 5, and the imaginary point is located outside the first housing 5.

[0105] As described above, since the imaginary point is located inside the balance weight 200, the balance weight 200 is located in an appropriate, balanced position, and since the imaginary point is located outside the first housing 5, the balance weight 200 can be provided outside the first housing 5, so there is no limit to the size of the balance weight 200, and a large balance weight 200 can be provided.

[0106] In the above embodiment, the balance weight 200 is provided on the portion (protruding portion 32c) of the extension portion 32b that protrudes to the outside of the first housing 5. As a result, the balance weight 200 is located outside the first housing 5 of the rotating table device 3, so there is no limit to the size of the balance weight 200, and a large balance weight 200 can be provided.

[0107] In addition, in the above embodiment, when the inclined rotating table device 1 is in a non-operating state, the upper surface of the rotating table 130 is located below the center position (center axis Za) of the rotating shaft 32, and the lower end of the balance weight 200 is located above the center position (center axis Za) of the rotating shaft 32.

[0108] This allows the rotational moment generated by the rotary table device 103 to be offset compared to when the balance weight 200 is positioned below the center position of the rotary shaft 32, thereby reducing the rotational moment generated in the rotary table 30.

[0109] ===Other embodiments=== The above-described embodiments are intended to facilitate understanding of the present invention and are not intended to limit the present invention. The present invention may be modified or improved without departing from the spirit thereof, and the present invention naturally includes equivalents thereof.

[0110] Furthermore, in the above embodiment, a two-stage cam mechanism is used as the rotary table device 103, but this is not limited to this. For example, a one-stage cam mechanism may be used, or a direct drive mechanism (a mechanism in which a motor, which is the driving unit, rotates the table directly without going through a cam, gear, etc.) may be used.

[0111] Furthermore, in the above embodiment, a four-point support ball bearing is used as the support bearing 34, but this is not limitative and, for example, a cross roller bearing may be used, and a bearing with high rigidity is preferable. [Explanation of symbols]

[0112] 1 tilting rotary table device, 3 rotating table device, 5 first housing (housing), 10 first motor, 12 first input shaft, 14 input side first cam, 14a input side first cam groove, 16 first coupling, 18 first input bearing, 20 input side first output table, 20a: input side first cam follower; 22: first intermediate shaft; 24 output side first cam (barrel cam), 24a output side first cam groove, 26 first intermediate bearing, 30 rotating table, 30a: output side first cam follower (cam follower), 30b: table surface, 32 rotating shaft, 32a table inner portion, 32b extension portion, 32c protruding portion, 34 first support bearing (support bearing), 34a rolling element, 34ac center of gravity, 103 rotary table device, 103a bolt, 105 second housing, 110 second motor, 112 second input shaft, 114 input side second cam, 114a input side second cam groove, 116 second coupling, 118 second input bearing, 120 input side second output table, 120a input side second cam follower, 122 second intermediate shaft, 124 output side second cam, 124a output side second cam groove, 126 second intermediate bearing, 130 rotary table, 130a output side second cam follower, 132 rotating shaft, 134 second support bearing, 200 balance weight, P0 intersection, P1 center of gravity, P2 center of gravity, Za center axis, Zb center axis,

Claims

1. a rotary table device having a rotary table and a rotary table driving unit that drives the rotary table; a rotating table device including a rotating table that rotates to swing the rotating table device and tilt the table surface of the rotating table, and a rotating table driving unit that drives the rotating table, a tilting rotary table device attached to the rotary table such that a direction along a central axis of the rotary table intersects with a direction along a central axis of the rotating table, the rotating table device has a rotating shaft that is provided at the center of the rotating table and rotates integrally with the rotating table, the rotating shaft having an extension that extends to a side opposite to the rotating table device as seen from the rotating table, a balance weight for balancing with the rotary table device is provided on the extension portion, and the center of gravity of the balance weight is located at a position spaced apart from the center position of the rotary shaft in a radial direction of the rotary shaft; a support bearing that includes a rolling element and rotatably supports the rotary table; from the center of gravity of the rotary table device to an intersection of a cross section of the rotating table that is parallel to the table surface of the rotating table and passes through the center of gravity of the rolling body and a central axis of the rotating table, A tilting and rotating table device characterized in that the imaginary extension of the drawn imaginary straight line intersects with the balance weight.

2. A rotary table device having a rotary table and a rotary table drive unit that drives the rotary table; a rotating table device including a rotating table that rotates to swing the rotating table device and tilt the table surface of the rotating table, and a rotating table driving unit that drives the rotating table, a tilting rotary table device attached to the rotary table such that a direction along a central axis of the rotary table intersects with a direction along a central axis of the rotating table, the rotating table device has a rotating shaft that is provided at the center of the rotating table and rotates integrally with the rotating table, the rotating shaft having an extension that extends to a side opposite to the rotating table device as seen from the rotating table, a balance weight for balancing with the rotary table device is provided on the extension portion, and the center of gravity of the balance weight is located at a position spaced apart from the center position of the rotary shaft in a radial direction of the rotary shaft; the rotating table device has a housing that accommodates the rotating table, the rotating table driving unit, and the rotating shaft; a portion of the extending portion of the rotating shaft protruding to the outside of the housing; The tilting and rotating table device is characterized in that the balance weight is provided on a portion of the extension that protrudes outside the housing.

3. A tilting rotary table device according to claim 1 or claim 2, the rotary table includes a cam follower; 10. A tilting and rotating table device, wherein the rotating table driving unit includes a barrel cam that engages with the cam follower.

4. A tilting rotary table device according to any one of claims 1 to 3, 1. A tilting and rotating table device, wherein one end of the tilting and rotating table device is attached to the rotary table, and the other end opposite to the one end is a free end.

5. A tilting rotary table device according to claim 1, When the weight of the rotary table device is M1, the weight of the balance weight is M2, and the length of the virtual line is L1, A virtual point on the virtual extension line that is a distance L2 = M1 × L1 / M2 from the intersection point is A tilting and rotating table device characterized in that it is located inside the balance weight.

6. 6. The tilting and rotating table device according to claim 5, the rotating table device has a housing that accommodates the rotating table, the rotating table driving unit, and the rotating shaft; a portion of the extending portion of the rotating shaft protruding to the outside of the housing; The tilting and rotating table apparatus is characterized in that the virtual point is located outside the housing.

7. A tilting rotary table device according to any one of claims 1 to 6, When the tilting and rotating table device is in an inoperative state, the upper surface of the rotary table is located below the center position of the rotation shaft, 10. An inclining and rotating table device, wherein the lower end of the balance weight is located above the center position of the rotation shaft.

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