positioner

Abstract

The positioner (1) is provided with: a first member (3); a rotary table (5) supported so as to be able to rotate relative to the first member about a predetermined axis (B); a motor disposed in parallel with the axis and rotationally driving the rotary table; a speed reducer (26) disposed between the first member and the rotary table, reducing the rotation of the motor and transmitting it to the rotary table; and a power supply cable supplying power to the rotary table, the first member and the speed reducer being provided with a hollow portion penetrating in a direction along the axis in a region including the axis, a brush mounting portion mounting a brush that fixes one end of the power supply cable in a detachable manner being provided on a surface of the first member on an opposite side from the rotary table, radially outside the hollow portion, the power supply cable extending from near the surface of the first member away from the axis, in a direction away from the rotary table, and being bent into a U shape, then penetrating the hollow portion along the axis, and one end being detachably fixed to the rotary table.

Description

Technical Field

[0001] This invention relates to locators. Background Technology

[0002] A known one-axis positioner includes: a base disposed on a horizontal mounting surface; and a rotary table supported in a manner capable of rotating relative to the base about a horizontal axis of rotation (see, for example, Patent Document 1). In this positioner, a motor that drives the rotary table is offset parallel to the axis of rotation of the rotary table. Furthermore, a speed reducer that decelerates the motor's rotation and transmits it to the rotary table has a hollow portion in the region containing the axis of rotation.

[0003] A cylindrical conductive shaft, extending along the rotation axis and fixed at one end to the rotary table, is disposed in the hollow section. A collector brush contacts the outer circumferential surface of the other end of the shaft. An external cable, with one end connected to the negative electrode of an external welding power source, is attached to the collector brush. In this configuration, even if the rotary table is rotated indefinitely, the electrical connection between the welding power source and the rotary table is maintained through the contact between the outer circumferential surface of the shaft and the collector brush.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 2021-30265 Summary of the Invention

[0007] The problem the invention aims to solve

[0008] The following problems exist: the equipment cost of the collector brush and conductive shaft increases, and the friction between the collector brush and the shaft leads to the generation of wear powder and wear of the collector brush. That is, in applications where the rotary table operates within a relatively small rotation angle range, a configuration without collector brushes is preferred; in applications where the rotary table operates within a relatively large rotation angle range, a configuration with collector brushes is preferred. Therefore, it is desirable to be able to easily switch between the two configurations.

[0009] Solution for solving the problem

[0010] One aspect of the present invention is a positioner comprising: a first component; a rotary table supported in a manner rotatable relative to the first component about a predetermined axis; a motor disposed parallel to the axis and rotatably driving the rotary table; a reducer disposed between the first component and the rotary table to reduce the rotation of the motor and transmit it to the rotary table; and a power cable supplying power to the rotary table. The first component and the reducer each have a hollow portion extending along the axis in a region containing the axis. A brush mounting portion is provided radially outside the hollow portion on the surface of the first component opposite to the rotary table, for detachably fixing a collector brush at one end of the power cable. The power cable extends from near the surface of the first component away from the axis in a direction away from the rotary table, bends into a U-shape, and then passes through the hollow portion along the axis, with one end detachably fixed to the rotary table. Attached Figure Description

[0011] Figure 1 This is a perspective view of the positioner according to the first embodiment of the present invention.

[0012] Figure 2 yes Figure 1 A longitudinal sectional view of the locator.

[0013] Figure 3 Viewed from the back side, opposite to the rotary table. Figure 1 A diagram of the first component of the locator.

[0014] Figure 4 This indicates that the shaft is configured at... Figure 3 The diagram shows the state in which the collector brush is mounted on the surface of the back side of the first component within the second hollow portion of the first component.

[0015] Figure 5 It means Figure 4 A longitudinal sectional view of the locator in its current state.

[0016] Figure 6 This is a longitudinal sectional view showing the positioner according to the second embodiment of the present invention. Detailed Implementation

[0017] Hereinafter, the positioner 1 of the first embodiment of the present invention will be described with reference to the accompanying drawings.

[0018] like Figure 1As shown, the locator 1 of this embodiment includes: a base 2, which is disposed on a horizontal surface such as the ground; a first component 3, which is supported in a manner that allows it to rotate relative to the base 2 about a horizontal first axis A; and a first drive mechanism 4, which drives the first component 3 to rotate.

[0019] Additionally, the positioner 1 includes: a rotary table 5 supported in a manner capable of rotating relative to the first component 3 about a second axis (a predetermined axis) B orthogonal to the first axis A; and a second drive mechanism 6 that drives the rotary table 5 to rotate. Furthermore, as... Figure 2 As shown, the positioner 1 includes a power cable (line body) 7 that connects the rotary table 5 to the negative electrode for welding, and a pipe (line body) 8 that supplies fluids such as pressurized air.

[0020] The base 2 includes a first support portion 9 and a second support portion 10, which are arranged in parallel and spaced apart along a first axis A. A first component 3 is mounted between the first support portion 9 and the second support portion 10 in a double-arm beam configuration. The first component 3 includes: a first shaft portion 12, which is supported on the first support portion 9 by means of a bearing 11 in a manner that allows it to rotate around the first axis A; and a second shaft portion 13, which is supported on the second support portion 10 by means of a first reducer 18 described below in a manner that allows it to rotate around the first axis A.

[0021] A first hollow portion 14 extending from the end face along the first axis A is provided in the first shaft portion 12. A through hole 15 extending along the first axis A is provided in the first support portion 9. A cylindrical sleeve 16 having an inner hole 16a is fitted into the through hole 15, and the sleeve 16 is fixed to the first support portion 9. In addition, the sleeve 16 is inserted into the first hollow portion 14 from the end face side of the first shaft portion 12, and the first shaft portion 12 is supported by a bearing 11 fitted between the outer peripheral surface of the sleeve 16 and the inner peripheral surface of the first hollow portion 14 in a manner that allows it to rotate around the first axis A.

[0022] The first hollow portion 14, located on the first shaft portion 12, extends further towards the second support portion 10 than the portion supported by the bearing 11, and opens towards the surface (hereinafter also referred to as the back side) of the first component 3 opposite to the rotary table 5. This forms a hollow path 50 that extends from the outside of the first support portion 9 in the direction of the first axis A, through the inner hole 16a of the sleeve 16 and the first hollow portion 14, between the first support portion 9 and the second support portion 10 towards the back side of the first component 3.

[0023] The first drive mechanism 4 includes: a first motor 17 fixed to a second support portion 10 of the base 2; and a first reducer 18 that reduces the rotation of the motor shaft 17a of the first motor 17 and transmits the speed to the first component 3. The first motor 17 causes the motor shaft 17a to pass through a through hole 19 provided in the second support portion 10 from the outside of the second support portion 10 and be fixed to the outer surface of the second support portion 10. The central axis of the motor shaft 17a is aligned with the first axis A.

[0024] The first reducer 18 includes: a fixed member 20 fixed to the inner surface of the second support portion 10; and an output shaft member 21 that rotates about a first axis A relative to the fixed member 20. Multiple gears (not shown) including gears meshing with a gear 22 fixed to the motor shaft 17a are housed inside the fixed member 20 and the output shaft member 21. The output shaft member 21 is fixed to the end face of the second shaft portion 13 of the first member 3.

[0025] exist Figure 2 In the figure, reference numeral 23 is a protrusion provided on the first component 3, and reference numeral 24 is a stop fixed to the base 2 and abutting against the protrusion 23. By providing the stop 24, which abuts against the protrusion 23 of the first component 3 when the first component 3 rotates around the first axis A, on the base 2, the rotation angle range of the first component 3 is limited to less than one revolution.

[0026] The rotary table 5 has a mounting surface 5a for placing workpieces, etc., and is made of a conductive material and formed into a circular plate shape. The rotary table 5 is positioned so that its central axis is aligned with the second axis B, and is supported on the first component 3 by means of the second reducer described below, so that it can rotate around the second axis B.

[0027] like Figure 2 as well as Figure 3 As shown, the second drive mechanism 6 includes: a second motor 25, which is offset parallel to the second axis B and fixed to the first component 3; and a second reducer 26, which reduces the rotation of the motor shaft (not shown) of the second motor 25 and transmits it to the rotary table 5. The second motor 25 is fixed to the surface of the opening 50a side (back side) of the hollow path 50 of the first component 3. The second reducer 26 is disposed between the first component 3 and the rotary table 5. The rotation of the motor shaft of the second motor 25, which is offset relative to the second axis B, is further reduced in the second reducer 26 after being reduced by the gear 34 and transmitted to the rotary table 5. The second drive mechanism 6 does not have a stop 24 like the first drive mechanism 4.

[0028] The rotary table 5, the second reducer 26, and the first component 3 have a second hollow portion (hollow portion) 27 extending along the second axis B in the region containing the second axis B. One end of the second hollow portion 27 in the direction of the second axis B opens toward the mounting surface 5a of the rotary table 5, and the other end opens toward the surface of the first component 3 on the same back side as the opening 50a of the hollow path 50.

[0029] like Figure 2 as well as Figure 3 As shown, on the surface of the back side of the first component 3 (the surface opposite to the rotary table 5) surrounding the opening on the back side of the second hollow portion 27, a brush mounting portion 29 is provided so that the current collector brush 28 described below can be detachably mounted. Figure 4 as well as Figure 5 As shown, the collector brush 28 includes, for example, a carbon brush portion 30 and a pressing portion 31, which has a spring (not shown) that pushes the brush portion 30 from the radially outer side of the second hollow portion 27 toward the radially inner side. The collector brush 28 has a terminal 28a that can be detachably connected to the power cable 7.

[0030] The brush mounting portion 29 includes: a seat surface 29a, which allows the pressing portion 31 to fit snugly along the direction of the second axis B; and one or more threaded holes 29b provided on the seat surface 29a, for fixing the pressing portion 31 to the first component 3 using screws 32. The brush mounting portion 29 is provided at two locations spaced apart circumferentially around the second axis B. Figure 3 In the example shown, the brush mounting portion 29 is radially separated from the second hollow portion 27 and is positioned at a position 180° apart in the circumferential direction.

[0031] like Figure 2 As shown, in the opening of the second hollow part 27 of the rotary table 5, an adapter 33 made of conductive material is fixed in a manner that allows it to be loaded and unloaded from the mounting surface 5a side of the rotary table 5 at the position where the opening is blocked.

[0032] As described below, the adapter 33 is provided with a terminal 35 and a through hole 36 for connecting the power cable 7 and the conduit 8.

[0033] In the figure, reference numeral 37 indicates a cylindrical sleeve component through which the second hollow portion 27 extends along the second axis B, for sealing the interior of the second reducer 26 and the lubrication space where the gear 34 is disposed, using the oil seal 38 fixed to the first component 3. Reference numeral 39 indicates an insulating plate electrically insulating the second reducer 26 from the rotary table 5, and reference numeral 40 indicates an insulating washer electrically insulating the bolt 48 from the rotary table 5. The insulating plate 39 and the insulating washer 40 are made of electrically insulating materials, such as insulating resin.

[0034] like Figure 2 As shown, one end of the power cable 7 and the pipe 8 are fixed to the distribution box 41 located on the side of the second support 10. By connecting the power cable 7 and the pipe 8 in the distribution box 41 through an external power supply device (not shown) and a fluid supply source (not shown), the rotary table 5 can be connected to the negative electrode and fluid can be supplied to the rotary table 5.

[0035] Additionally, one end of a motor cable (not shown) connected to the first motor 17 and the second motor 25 is fixed in the distribution box 41. At one end of the motor cable in the distribution box 41, a cable (not shown) extending from an externally located control device is connected.

[0036] The other end of the motor cable for the first motor 17 is connected to the first motor 17 near the distribution box 41. The power cable 7, along with the conduit 8 and the motor cable for the second motor 25 connected to the second motor 25, are led out from the distribution box 41, for example, through the lower part of the base 2 towards the side of the first support 9, and then introduced from the outside of the first support 9 into the hollow path 50.

[0037] Linear elements such as power cable 7, which are inserted into the hollow path 50, extend along the first axis A near the first axis A within the hollow path 50, and are then pulled out from the opening 50a on the back side of the first component 3 toward the outside of the hollow path 50.

[0038] The motor cable for the second motor 25, which is pulled out from the opening 50a on the back side of the first component 3, is connected to the second motor 25 fixed to the first component 3.

[0039] The power cable 7 and other linear elements, pulled out from the opening 50a on the back side of the first component 3, extend from near the surface of the first component 3 away from the second axis B, toward the direction away from the rotary table 5, and then bend in a U-shape by about 180°. The bent power cable 7 and other linear elements extend along the second axis B, are inserted into the second hollow portion 27 from the opening on the back side of the second hollow portion 27, and the other end is fixed to the adapter 33 in a detachable manner.

[0040] In the portion where the power cable 7 and other linear elements bend 180°, the position along the direction of the second axis B is positioned closer to the rotary table 5 than the end of the second motor 25 on the head side. That is, the power cable 7 and other linear elements bend back 180° at a position not exceeding the end of the second motor 25 on the head side.

[0041] The power cable 7 and conduit 8, which pass through the second hollow section 27, run approximately straight along the second axis B near the second axis B. The power cable 7 and conduit 8, which are bent into a U-shape from the position where they are pulled out from the opening 50a of the first component 3 to the position where they are connected to the adapter 33 of the rotary table 5, are in a free state that allows them to be displaced without interfering with the surrounding components.

[0042] The function of the positioner 1 configured as described below will be explained.

[0043] According to the positioner 1 of this embodiment, since the power cable 7 and the pipe 8 are connected to the adapter 33 fixed to the rotary table 5, the workpiece mounted on the mounting surface 5a of the rotary table 5 can be connected to the negative electrode and fluid can be supplied.

[0044] In this case, the first component 3 is rotated relative to the base 2 about the first axis A by the operation of the first drive mechanism 4, thereby changing the tilt angle of the workpiece about the first axis A. Furthermore, the rotary table 5 is rotated relative to the first component 3 about the second axis B by the operation of the second drive mechanism 6, thereby changing the angle of the workpiece about the second axis B.

[0045] By rotating the first component 3 relative to the base 2 about the first axis A, torsional force is applied to the power cable 7 and the conduit 8 disposed in the portion of the hollow path 50. Since the power cable 7 and the conduit 8 within the hollow path 50 extend along the first axis A near the first axis A, the torsional force can be absorbed by tortuous deformation of this portion.

[0046] In particular, the rotation of the first component 3 relative to the base 2 about the first axis A causes the tilt angle of the workpiece relative to the horizontal plane to change, and the rotation angle range is limited by the protrusion 23 and the stop 24, so that a large torsional force will not act on the power cable 7 and the pipe 8.

[0047] On the other hand, if the rotary table 5 is rotated relative to the first component 3 around the second axis B, the torsional force is applied to the power cable 7 and the pipe 8 fixed to the rotary table 5 via the adapter 33. When the rotation angle range of the rotary table 5 around the second axis B is relatively large, a relatively large torsional force is applied to the power cable 7 and the pipe 8.

[0048] According to this embodiment, the power cable 7 and other linear elements extending from the opening 50a of the hollow path 50 of the first component 3 to the adapter 33 are folded back 180° in a U-shape, thus becoming free over a relatively long range. Therefore, even if the rotating worktable 5 is subjected to a torsional force around the second axis B while rotating around the second axis B, the torsional force can be effectively absorbed by causing torsional or bending deformation of the free portion of the power cable 7 and other linear elements extending from the opening 50a of the first component 3 to the adapter 33. This reduces the load applied to the power cable 7 and other linear elements.

[0049] That is, when the rotary table 5 is used to rotate around the second axis B within a relatively large range of rotation angles, such as ±180°, it can be used as a movable cable to reduce the load applied to linear bodies such as the power cable 7. Moreover, it has the following advantages: in this case, there is no need for collector brushes and shafts that allow unlimited rotation, and these collector brushes and shafts that allow unlimited rotation are not installed, thereby reducing costs and making maintenance easier.

[0050] On the other hand, when the positioner 1 is used for applications where the rotary table 5 needs to rotate infinitely around the second axis B, or where the rotary table 5 needs to rotate within a relatively large rotation angle range exceeding, for example, 360°, the following settings are made.

[0051] First, disconnect the adapter 33 from the rotary table 5, and disconnect the power cable 7 and pipe 8 connected to the adapter 33, pulling them out from the second hollow part 27. Also, remove the sleeve component 37 that is fixed relative to the rotary table 5.

[0052] Next, as Figure 5 As shown, a cylindrical shaft 42 made of conductive material and another adapter 44, with a rotary joint 43 disposed within the inner bore 42a of the shaft 42, are mounted on a rotary table 5. When the other adapter 44 is mounted on the rotary table 5, the shaft 42 and the rotary joint 43 are coaxially arranged through the second hollow portion 27 with the second axis B. In this case, the front end of the shaft 42 is positioned to protrude outward from the opening on the back side of the second hollow portion 27. The outer diameter of the shaft 42 is the same as the outer diameter of the sleeve component 37, maintaining the sealing of the lubrication space using the oil seal 38.

[0053] In addition, such as Figure 4 as well as Figure 5 As shown, a collector brush 28 is installed in the brush mounting section 29 provided in the first component 3.

[0054] The current collector brush 28 is mounted on the first component 3 by fixing the pressing part 31 to the brush mounting part 29. The brush part 30 is pressed from the radially outer side towards the outer peripheral surface of the shaft 42 exposed on the back side of the first component 3 by the spring of the pressing part 31.

[0055] Finally, the power cable 7 removed from the adapter 33 is connected to the collector brush 28 using terminal 28a, and the conduit 8 is connected to the rotary joint 43.

[0056] Therefore, if the rotary table 5 is rotated around the second axis B, the shaft 42 rotates together with the rotary table 5, and the outer peripheral surface of the shaft 42 remains in contact with the brush part 30. Thus, even if the rotary table 5 is rotated indefinitely using the current collector brush 28, the rotary table 5 can be continuously connected to the negative electrode while the fixed power cable 7 remains unchanged.

[0057] According to this embodiment, by providing the brush mounting portion 29 at two locations radially separated by the second hollow portion 27, the brush portion 30 can be pressed against the outer peripheral surface of the shaft 42 from both sides in opposite directions. This counteracts the pressing force of the brush portion 30 acting on the shaft 42, preventing the force biased towards the shaft 42 from exerting its effect.

[0058] Furthermore, by connecting pipe 8 to rotary joint 43, the fluid flow path can be maintained even when the rotary table 5 rotates around the second axis B. Thus, fluid can be continuously supplied to the rotary table 5 regardless of its rotation angle.

[0059] In this case, the power cable 7 and other linear elements that are directly connected to the adapter 33 are bent into a U-shape, thus having sufficient excess length for mobility, so that even when connected to the collector brush 28 or the rotary joint 43, they have sufficient length.

[0060] Furthermore, the power cable 7 and the conduit 8 are relatively thick and rigid, but as mentioned above, they are of sufficient length to be easily bent and to be easily connected to the collector brush 28 and the rotary joint 43.

[0061] Therefore, even if a change in application necessitates the installation of the collector brush 28 and the rotary joint 43, installation can be performed simply without replacing components such as the power cable 7. In other words, it offers the advantage of easily switching between a configuration where the collector brush 28 is not installed (e.g., when the required rotation angle range for the rotary table 5 is small), and a configuration where the collector brush 28 is installed (e.g., when the required rotation angle range for the rotary table 5 is large), or vice versa.

[0062] The power cable 7 connected to the collector brush 28 and the pipe 8 connected to the rotary joint 43 remain stationary regardless of the rotation of the rotary table 5. In this case, the power cable 7 and the like, pulled out from the opening 50a of the hollow path 50 of the first component 3, are preferably secured with cable ties 46 or clamping components to prevent them from moving toward the first component 3.

[0063] Next, the positioner 51 of the second embodiment of the present invention will be described with reference to the accompanying drawings. In the description of this embodiment, parts that have a common structure with the positioner 1 of the first embodiment are labeled with the same reference numerals and their descriptions are omitted.

[0064] In the first embodiment, an example is given of a dual-axis positioner that supports the rotary table 5 in a manner capable of rotating about a first axis A and a second axis B. Instead, as... Figure 6 As shown, the positioner 51 in this embodiment is a positioner that rotates only one axis relative to the base 2 about its central axis C. In this case, the base 2 corresponds to the first component 3.

[0065] In the positioner 51 of this embodiment, the power cable 7 and other linear elements extending from the distribution box 41 are fixed by a clamping member 47 at a position away from the central axis C of the rotary table 5 and near the back side of the rotary table 5. The power cable 7 and other linear elements, after bending away from the position fixed by the clamping member 47, bend 180° in a U-shape and are inserted into the second hollow portion (hollow portion) 27 along the central axis C of the rotary table 5. The power cable 7 and other linear elements inserted into the second hollow portion 27 are directly connected to the adapter 33 of the rotary table 5.

[0066] Even in the positioner 51 of this embodiment, by mounting the shaft 42 and the rotary joint 43 to the rotary table 5 and mounting the collector brush 28 to the brush mounting part 29 when the rotation angle range of the rotary table 5 is large, the form can be easily switched. In this case, since the power cable 7 and other linear bodies have sufficient length for mobility, they have sufficient length even when connected to the collector brush 28 or the rotary joint 43. Moreover, it has the advantage that even if the power cable 7 and other linear bodies are relatively thick and rigid, the longer linear bodies can be bent more easily, and it is easy to perform the processing for connecting to the collector brush 28 and the rotary joint 43.

[0067] Furthermore, in the positioners 1 and 51 of the above embodiments, two brush mounting portions 29 are provided at circumferential intervals on the radially outer side of the second hollow portion 27 of the first component 3. However, instead, there may be one portion or three or more portions. This provides redundancy: by providing multiple portions, even if one brush portion 30 has poor contact with the shaft 42, electrical connection can be maintained through contact between other brush portions 30 and the shaft 42.

[0068] Furthermore, even when more than three collector brushes 28 are installed, it is preferable that the brush mounting portions 29 are arranged at equal intervals circumferentially around the central axis of the rotary table 5. This allows the pressure applied from the brush portion 30 to the shaft 42 to be counteracted, thus eliminating bias.

[0069] Alternatively, instead of arranging the brush mounting portions 29 at equal intervals along the circumferential direction around the central axis of the rotary table 5, a single portion or multiple portions at unequal intervals along the circumferential direction can be arranged, provided that the offset of the pressing pressure is permissible. Furthermore, instead of arranging multiple collector brushes 28 at circumferentially spaced intervals, multiple collector brushes 28 can be arranged side-by-side at the same circumferential position in the direction along the central axis of the rotary table 5. This maintains the redundancy of the collector brushes 28 while reducing the space required to install the collector brushes 28 around the central axis of the rotary table 5.

[0070] Additionally, the brush mounting part 29 includes a seat surface 29a that allows the pressing part 31 to be in close contact with the central axes A and C of the rotary table 5. In this case, the seat surface 29a is formed along a plane orthogonal to the central axes A and C. Alternatively, the seat surface 29a may be formed along a plane parallel to the central axes A and C of the rotary table 5.

[0071] Furthermore, in this embodiment, the case where the power cable 7 and the conduit 8 are connected to the adapter 33 fixed to the rotary table 5 has been described. However, a signal cable can also be connected instead. In applications where the rotary table 5 can be rotated indefinitely, the signal cable can be kept connected using the rotary joint 43.

[0072] In addition, in this embodiment, such as Figure 4 as well as Figure 5 As shown, dust covers 45 can also be provided at the locations of the second motor 25, brush mounting portion 29, opening 50a of the first hollow portion 14, and opening of the second hollow portion 27, which are fixed to the back side of the first component 3. This protects the power cable 7, the motor cable of the second motor 25, the conduit 8, the opening 50a of the first hollow portion 14, and the opening of the second hollow portion 27 from exposure to the outside.

[0073] Furthermore, when the collector brush 28 is installed in the brush mounting part 29, the collector brush 28 and the shaft 42 can also be disposed inside the dust cover 45. This prevents external dust from adhering between the brush part 30 and the shaft 42, and also prevents wear powder from the brush part 30 or the shaft 42 from flying outward.

[0074] Furthermore, by folding back the curved portion of the power cable 7 and other linear elements at a position not exceeding the end of the head side of the second motor 25, the height of the dust cover 45 covering the back side of the first component 3 containing the second motor 25 can be minimized. This prevents interference between the dust cover 45 and the base 2 when the first component 3 rotates around the first axis A, and also achieves a compact positioning device 1.

[0075] Explanation of reference numerals in the attached figures:

[0076] 1.51: Positioner

[0077] 2: Base (First Component)

[0078] 3: First component

[0079] 5: Rotary worktable

[0080] 7: Power cable

[0081] 12: First shaft section (shaft section)

[0082] 25: Second motor (motor)

[0083] 26: Second reducer (reducer)

[0084] 27: Second hollow section (hollow section)

[0085] 28: Collector brush

[0086] 29: Install the software

[0087] 50: Hollow Path

[0088] A: First axis

[0089] B: Second axis (pre-determined axis)

[0090] C: Central axis (predetermined axis)

Claims

1. A locator, characterized in that, have: First component; A rotary table is supported in a manner that allows it to rotate relative to the first component about a predetermined axis; A motor, which is offset parallel to the axis, and drives the rotary table. A speed reducer, disposed between the first component and the rotary table, reduces the rotational speed of the motor and transmits the speed to the rotary table; and A power cable supplies power to the rotary table. The rotary table, the first component, and the reducer each have a hollow portion in the region containing the axis that extends through the axis and opens into the surface of the first component on the opposite side of the rotary table, i.e., the back side. The rotary table is configured to secure one end of the power cable in a detachable manner. On the radially outer side of the hollow portion on the rear side surface, a brush mounting portion is provided to detachably fix one end of the power cable to the collector brush. The power cable extends from near the surface on the back side away from the axis, toward the direction away from the rotary table, and bends into a U-shape, so that when the collector brush is not installed in the brush mounting part, one end of the power cable passes through the hollow part along the axis and is fixed to the rotary table in a detachable manner.

2. The locator according to claim 1, characterized in that, The positioner has a base disposed on a horizontal surface to be positioned. The first component has a shaft portion that is supported in a manner that allows it to rotate relative to the base about a first horizontal axis orthogonal to the axis, and has a hollow path extending from an end of the shaft portion along the first axis in a region including the first axis and opening toward the rear side surface. The power cable passes through the hollow path and is connected to an external power supply device.

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