JP2013018017A - Workpiece-inverting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a workpiece-inverting device high in work efficiency while including an electric support device for supporting a workpiece.SOLUTION: In the workpiece-inverting device 1 including workpiece rotation-supporting devices 10 for rotatably supporting a workpiece 5, the workpiece rotation-supporting device 10 includes a frame 11, a rotating body 20 supporting a predetermined part of the workpiece 5 and rotatably supported to the frame 11, and a power cable 30 for supplying power to the rotating body 20 from the outside; the frame 11 includes a plurality of support members 14 for rotatably supporting the rotating body 20, and a rotation drive device 17 connected to the power cable 30 and being a drive source for rotationally driving the rotating body 20; the rotating body 20 includes a rotary ring housing 21 supported to the support members 14, and an electric support device 23 installed on the rotary ring housing 21 for supporting the workpiece 5; and the rotation drive device 17 restricts the maximum rotation angle of the rotating body 20.

Description

  The present invention relates to a work reversing device that rotatably holds a work for welding work or the like.

  Conventionally, many devices for holding workpieces have been provided for welding, painting, processing, etc. of workpieces such as long steel poles and booms. To increase work efficiency, the held workpieces can be freely adjusted. There is also provided a work reversing device that can be rotated in a rotating manner.

  Such a workpiece reversing device is disclosed in, for example, Patent Documents 1 to 3 below, and includes a workpiece holding device including a gantry fixedly installed on a floor and a rotating body that is rotatably supported with respect to the gantry. The work is held by a clamping device installed on the rotating body.

JP-A-6-91396 Japanese Patent Application Laid-Open No. 6-292991 JP 2003-25093 A

  However, in the conventional work reversing device, the clamping device installed on the rotating body is manual, so the work is fixed to the rotating body by turning the handle, etc., which is labor intensive and poor work efficiency . This is because if a power cable for supplying electric power is connected to a rotatable rotating body, the cable may become entangled or wound with the rotation.

  Patent Document 1 discloses that an electric clamp device is installed on a rotating body. However, in Patent Document 1, in order to prevent entanglement of the power cable and the like, the power cable is connected only when the electric clamp device is operated, and the power cable is not obstructed by removing the power connector when rotating the rotating body. Therefore, it is necessary to keep it away, and work efficiency is bad.

  This invention is made | formed in view of such a subject, and it aims at providing the workpiece | work reversing apparatus with high working efficiency, providing the electric support apparatus for supporting a workpiece | work.

  In order to solve the above problems, a work reversing device according to the present invention is a work reversing device including a work rotation supporting device that rotatably supports a work, wherein the work rotation supporting device includes a gantry installed on a floor, A rotating body that supports a predetermined portion of the work and is rotatably supported by the mount; and a power cable for supplying electric power to the rotating body from the outside. A plurality of support members that are rotatably supported; and a rotation drive device that is connected to the power cable and is a drive source that rotates the rotation body. The rotation body is supported by the support member. A ring housing, and an electric support device that is installed in the rotating ring housing and supports the workpiece. The rotation driving device is configured such that the power cable is connected with the rotation of the rotating body. Characterized in that the Manai so limiting the maximum rotation angle of the rotating body.

  According to the work reversing device according to the present invention, the work can be supported by the electric support device installed on the rotating body, and the rotating body can be rotated without being entangled with the power cable. Work efficiency such as welding work can be greatly increased.

FIG. 1 is a diagram showing a use state of a work reversing device according to an embodiment of the present invention. FIG. 2 is a front view of the first workpiece rotation support device according to the embodiment of the present invention. FIG. 3 is a front view of the second workpiece rotation support device according to the embodiment of the present invention. FIG. 4 is a rear view of the rotating body according to the embodiment of the present invention. FIG. 5 is a side view of the rotating body according to the embodiment of the present invention. FIG. 6 is a diagram showing a deformation associated with the rotation of the rotating body of the power cable according to the embodiment of the present invention. FIG. 7 is a perspective view showing the configuration of the cable bear according to the embodiment of the present invention.

  Hereinafter, a work reversing device according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a diagram illustrating a usage state of the work reversing device according to the present embodiment. In the present embodiment, a case where the work reversing device 1 holds a boom 5 used as a support of a large machine such as a crane or an excavator as a long work will be described as an example.

  As shown in the figure, the work reversing device 1 includes a first work rotation support device 10A located on the left side in the drawing and a second work rotation support device 10B located on the right side in the drawing, both of which are respectively By supporting the end portion of the boom 5, the boom 5 is rotatably held.

  At both ends of the boom 5, joint holes 6 for forming joints that rotatably connect other members are formed. In this embodiment, as will be described later, the boom 5 is supported by inserting a member on the work reversing device 1 side into the joint hole 6.

  Next, the configuration of the work rotation support device 10 will be described with reference to FIGS. 2 and 3 as well. FIG. 2 is a front view of the first workpiece rotation support device, and FIG. 3 is a front view of the second workpiece rotation support device. The first work rotation support device 10A and the second work rotation support device 10B have many configurations in common, and the same components are assigned the same numbers.

  The work rotation support device 10 includes a gantry 11 installed on a floor of a factory, a rotator 20 rotatably supported on the gantry 11, and a power cable 30 for supplying power to members of the rotator 20. It has.

  The gantry 11 includes a gantry housing 12, a gantry cable guide 13, a support roller 14, a rotation driving device 17, and a position detection switch 18. The gantry housing 12 constituting the outer frame of the gantry 11 has a substantially rectangular parallelepiped shape whose outer shape is substantially rectangular when viewed from the front, and a large opening is formed at the center for rotatably supporting the rotating body 20. . The diameter of this opening is slightly smaller than the diameter of the outer shape of the rotator 20, and the peripheral portion of the rotator 20 supported by the gantry 11 is covered with the gantry housing 12 and cannot be seen from the outside.

  Five support rollers 14 are installed on the inside of the gantry housing 12 and around the opening as support members for rotatably supporting the rotating body 20. The rotation driving device 17 is a driving force source for rotating the rotating body 20 and includes a driving motor 171 and a rotation driving gear 172. The rotation drive device 17 is installed in the lower part inside the gantry housing 12 and in the periphery of the opening.

  Further, a position detection switch 18 for detecting the rotational position of the rotating body 20 is installed at a position around the opening inside the gantry housing 12 and facing the rotating body 20. The position detection switch 18 includes a reference position switch 181, a + 200 ° switch 182, a −200 ° switch 183, and a rotation direction detection switch 185.

  When viewed from the front, the reference position switch 181 is installed at the 9 o'clock position on the first mount 11A and at the 3 o'clock position on the second mount 11B when viewed from the front. The + 200 ° switch 182 is installed at a position of 200 ° clockwise from the reference position in the first frame 11A, and at a position of 200 ° counterclockwise from the reference position in the second frame 11B. The −200 ° switch 183 is installed at a position of 200 ° counterclockwise from the reference position in the first mount 11A, and at a position of 200 ° clockwise from the reference position in the second mount 11B.

  The ± 200 ° switches 182 and 183 are installed in pairs at each location as a spare. In addition, the position detection pin 25 is installed on the rotating body 20 side, and the rotation of the rotating body 20 is detected by the switches 181, 182, and 183 detecting the position detection pin 25 that rotates as the rotating body 20 rotates. The position can be detected.

  The rotation direction detection switch 185 detects the rotation direction of the rotating body 20 by detecting a rotation direction detection pin (not shown) installed on the rotating body 20 side that rotates as the rotating body 20 rotates. be able to.

  In the present embodiment, the upper limit of the rotation angle is set for the rotation drive by the rotation drive device 17 based on the output (rotation position and rotation direction) of the position detection switch 18. The maximum rotation angle is set so as to rotate only up to ± 200 ° from the reference position.

  Specifically, in the first workpiece rotation support device 10A, when the rotation drive device 17A detects that the rotating body 20A has rotated from the reference position to + 200 ° based on the output of the + 200 ° switch 182A, the drive motor 171A is turned on. Control is performed so that the rotating body 20 </ b> A is not driven clockwise further. Further, when the rotation driving device 17A detects that the rotating body 20A has rotated from the reference position to −200 ° based on the output of the −200 ° switch 183A, the driving motor 171A is stopped, and the rotating body 20A is further moved. Control not to drive counterclockwise.

  Although the first work rotation support device 10A is fixed to the floor as a master unit, the second work rotation support device 10B as a slave unit further includes a slide mechanism 19 and is configured to be movable with respect to the floor. ing. Thereby, the space | interval of 10 A of 1st workpiece | work rotation support apparatuses and the 2nd workpiece rotation support apparatus 10B can be changed, and the workpiece | work reversing apparatus 1 can hold | maintain the long workpiece | work of various length. .

  Next, the configuration of the rotating body 20 will be described with reference to FIGS. 4 to 6 in addition to FIGS. FIG. 4 is a rear view of the rotating body according to the present embodiment. FIG. 5 is a side view of the rotating body according to the present embodiment. In FIG. 5, a part (portion of the rotating body cable guide) is shown in a sectional view. FIG. 6 is a diagram illustrating a state of the power cable when the rotating body according to the present embodiment rotates. 4-6 is a figure about the 1st rotary body 20A, and in the case of the 2nd rotary body 20B, arrangement | positioning of the power cable 30 becomes right and left reverse.

  The rotating body 20 includes a rotating ring casing 21, an electric clamp device 23, and position detection pins 25. The rotating ring casing 21 is a hollow ring-shaped steel casing in which a through hole 212 is formed at the center, and is rotatably supported by the support roller 14 in the above-described frame 11. A ring gear 217 for meshing with the rotation drive gear 172 of the rotation drive device 17 on the gantry 11 side is formed on the circumferential surface of the rotation ring casing 21 (see FIG. 5).

  As shown in FIGS. 1 and 2 and the like, an electric clamp device 23 for supporting the boom 5 is installed on the front side of the rotating ring casing 21. The electric clamp device 23 includes a pair of tip bosses 231 and an electric drive motor (not shown) for adjusting the distance by sliding the two tip bosses 231. The electric clamp device 23 is connected to the power cable 30 and receives power from an external power source to the drive motor via the power cable 30.

  The first electric clamp device 23A of the first rotating body 20A is configured to be supported by sandwiching the boom 5 from both sides by two tip bosses 231A. When supporting the boom 5, the front end boss 231 </ b> A is inserted into the joint hole 6 of the boom 5 from the outside by electrically sliding the two front end bosses 231 </ b> A closer to each other.

  On the other hand, the second electric clamping device 23B of the second rotating body 20B is configured to support the two tip bosses 231B by pressing them against the boom 5 from the inside. When the boom 5 is supported, the front end boss 231B is inserted into the joint hole 6 of the boom from the inside by electrically sliding the two front end bosses 231B away from each other.

  As shown in FIGS. 4 and 5, a rotating body cable guide 213 for guiding the power cable 30 is formed on the back side of the rotating ring housing 21. FIG. 5 is a side view of the rotator 20, but the portion of the rotator cable guide 213 is a cross-sectional view of a vertical plane passing through the center of the rotator 20. Further, in FIG. 5, the illustration of the power cable 30 is omitted.

  The rotating body cable guide 213 is a guide member for extending the power cable 30 in an arc shape, and includes a circumferential inner diameter guide 214 formed along the inner diameter in the vicinity of the inner diameter of the rotating ring casing 21, and a rotating member. A ring-shaped outer diameter guide 215 is formed in the vicinity of the outer diameter of the ring casing 21 along the outer diameter.

  As shown in FIG. 5, the inner diameter guide 214 and the outer diameter guide 215 have an L-shaped vertical cross section, and after vertically rising from the back surface of the rotating ring casing 21, the inner diameter guide 214 and the outer diameter guide 215 are bent vertically to the outer diameter side or the inner diameter side. It has an L-shaped cross-sectional shape.

  The power cable 30 is accommodated in a cable accommodation region sandwiched between the inner diameter guide 214 and the outer diameter guide 215 while being folded once while extending in an arc shape. Specifically, as shown in FIG. 4, the power cable 30 connected to the external power source is accommodated in the outer diameter guide 215 from the gantry-side fixing portion 301 via the gantry 11.

  The power cable 30 is fixed to the gantry 11 side in the gantry-side fixing portion 301, and the gantry-side fixing portion 301 does not move even when the rotating body 20 (the rotating body cable guide 213) rotates. Therefore, the gantry 11 side of the power cable 30 is always accommodated in the rotating body cable guide 213 from the gantry side fixing portion 301.

  As shown in FIG. 4, the power cable 30 accommodated in the rotating body cable guide 213 from the gantry-side fixing portion 301 extends about 90 ° clockwise along the outer diameter guide 215 and then rotates the cable guide 213. And then extends about 135 ° counterclockwise along the inner diameter guide 214. This position becomes the rotating body side fixing portion 302, and the power cable 30 is fixed to the rotating ring housing 21 at the rotating body side fixing portion 302.

  The power cable 30 is connected to the electric clamp device 23 fixed to the rotating ring casing 21 at the tip of the rotating body side fixing portion 302. Further, the rotating body side fixing portion 302 is integrated with the rotating ring casing 21, and when the rotating body 20 rotates, the rotating body side fixing portion 302 also moves together.

  Therefore, the power cable 30 accommodated in the rotary body cable guide 213 is fixed to the base side fixing portion 301 and is not fixed when the rotary body 20 rotates, whereas the power source cable 30 accommodated in the rotary body side guide 213 is not fixed. A part on the rotating body 20 side fixed in the fixing portion 302 rotates on the circumference together with the rotation. Therefore, the power cable 30 in the rotating body cable guide 213 is also deformed with the rotational movement.

  In the rotating body cable guide 213, the power cable 30 is housed and supported in a cable bear (registered trademark, hereinafter the same) 35 shown in FIG. The cable bear 35 in which the rotary joints are installed at predetermined intervals is a cable protector configured in a caterpillar shape that defines the bending direction and the curvature of the cable to be wired and protects the cable. The cable bear 35 restricts the power cable 30 to be bent only in a plane parallel to the rotation direction of the rotating body 20. Thus, by using the cable bear 35, the deformation | transformation of the power cable 30 shown below can be implement | achieved smoothly.

  Next, deformation of the power cable 30 accompanying rotation of the rotating body 20 will be described with reference to FIG. 6A and 6B are diagrams showing deformation accompanying the rotation of the rotating body of the power cable according to the present embodiment, in which FIG. 6A is an initial reference position, and FIG. 6B is a position rotated 200 degrees counterclockwise. FIG. 6C shows the state of the power cable at a position rotated by 200 ° clockwise.

  The gantry cable guide 13 shown in FIG. 6 is a guide that is fixedly installed on the gantry 11 side, and is approximately 180 counterclockwise from a position corresponding to the gantry side fixing portion 301 along the inner diameter guide 214 of the rotating body 20. It is installed to extend over °. A part of the power cable 30 that is pulled or pushed back by the rotating body side fixing portion 302 that rotates is moved in the space between the gantry cable guide 13 and the inner diameter guide 214.

  FIG. 6 is a view as seen from the back side (the side opposite to the boom 5) of the rotator 20 as in FIG. 4, and shows the first rotator 20A. In the case of the second rotating body 20B, the arrangement of the power cable 30 is reversed left and right.

  The gantry-side fixing portion 301 of the power cable 30 is in the same position at all the rotational positions of FIGS. 6A to 6C, but the rotating body-side fixing portion 302 is not connected to the timepiece at the reference position of FIG. In the state where the rotating body 20 is rotated counterclockwise by 200 ° from the reference position as shown in FIG. 6B, the rotating body side fixing portion 302 is also in the reference position. It is located 200 ° counterclockwise. Further, as shown in FIG. 6C, in a state where the rotating body 20 is rotated clockwise by 200 ° from the reference position, the rotating body-side fixing portion 302 is also located at a position of 200 ° clockwise from the reference position. Yes.

  At this time, the power cable 30 accommodated in the cable bear 35 is rotated approximately 90 ° clockwise along the outer diameter guide 215 from the gantry-side fixing portion 301 at the reference position in FIG. It is folded back in the body cable guide 213 and this time extends counterclockwise along the inner diameter guide 214 to the rotating body side fixing portion 302.

  When the rotating body rotates counterclockwise from the state of FIG. 6A, the rotating body-side fixing portion 302 also moves counterclockwise along the inner diameter guide 214 along with the rotation. By being pulled by this, the place where the power cable 30 is folded also gradually moves counterclockwise.

  When the rotating body 20 is rotated counterclockwise from the reference position to a position of 200 °, the place where the power cable 30 is folded is moved so as to be pulled close to the gantry-side fixing portion 301 as shown in FIG. Most of the power cable 30 extends to the rotating body side fixing portion 302 along the inner diameter guide 214.

  On the other hand, when the rotating body 20 rotates clockwise from the reference position to a position of 200 °, as shown in FIG. 6C, the rotating body 20 moves clockwise so that the place where the power cable 30 is folded back is pushed. Most of it will extend along the outer diameter guide 215.

  As described above, when the power cable 30 moves as the rotating body 20 rotates, the power cable 30 is guided from the inner diameter guide 214 by the guide of the stationary gantry cable guide 13 formed on the gantry 11 side. It can move smoothly without getting tangled away.

  As described above, the power cable 30 is deformed along with the rotation of the rotating body 20, but in this embodiment, the power cable 30 is once folded in the rotating body cable guide 213 installed in the rotating body 20. Thus, it extends along the guide 214 on the inner diameter side and the guide 215 on the outer diameter side and accommodates it. The gantry side fixing portion 301 of the power cable 30 is installed on the outer diameter guide 215 side, and the rotating body side fixing portion 302 is installed on the inner diameter guide 214 side.

  In addition, when the rotating body 20 rotates, the power cable 30 is moved by the folding position while changing the length extending in the outer diameter guide 215 and the length extending in the inner diameter guide 214. Absorbs rotation.

  Therefore, even when the rotating body 20 rotates, the bent power cables 30 can be prevented from coming into contact with each other and entangled, and the rotating body 20 can be smoothly rotated. In particular, in this embodiment, since the power cable 30 is stored in the cable bear 35 in the rotating body cable guide 213, the entanglement due to the contact between the power cables 30 can be reliably prevented.

  Further, as described above, in the gantry 11, the rotation driving angle of the rotating body 20 by the rotation driving device 17 is limited within a range of ± 200 ° from the reference position based on the detection of the position detection switch 18. For example, if the rotator 20 rotates more than once in one direction from a certain position, or if the rotator 20 tries to return to the original position after being rotated more than twice, the power cable 30 may be wound around the rotator 20 or the remaining power There is a possibility that the cable 30 may get entangled and become unable to rotate.

  On the other hand, by restricting the maximum rotation angle of the rotating body 20 as in the present embodiment, the power cord 30 can be prevented from being wound due to the rotating body 20 continuing to rotate, and the rotating body 20 can be smoothly smoothed. Rotation can be realized.

  In the welding work of the boom 5 or the like, it is not necessary to rotate the boom 5 many times as long as the boom 5 can be accessed from an angle of approximately 360 °. Therefore, it is sufficient if the boom 5 can be rotated by ± 200 ° from the reference position, that is, a total of 400 ° as in the present embodiment. Of course, the limitation on the maximum rotation angle of the rotating body 20 is not limited to ± 200 ° from the reference position, and can be set as appropriate. Further, it is not necessary to restrict the angle equally from the reference position to the left and right, and the rotation restriction may be provided unevenly to the left and right, such as 100 degrees clockwise and 300 degrees counterclockwise.

  However, in order to secure the work efficiency to the boom 5 to some extent, it is desirable to set it so that it can rotate 320 ° or more from the reference position in the left and right directions. Further, in order to prevent the power cable 30 from being entangled and wound by rotation, it is desirable to limit the maximum rotation angle to 420 ° or less in total from the reference position. In other words, the limitation on the maximum rotation angle of the rotating body 20 in the rotary drive device 17 is desirably set so that the total of the maximum rotation angles in the left and right directions from the predetermined reference position of the rotating body 20 is 420 ° or less.

  The configuration of the work reversing device 1 has been described in detail above. Next, how the work reversing device 1 is used will be described. In welding work or the like, the boom 5 is first held by the work reversing device 1. The slide mechanism 19 is operated according to the length of the boom 5 to set the second work rotation support device 10B at a desired distance from the first work rotation support device 10A. In this state, the boom 5 is suspended by a crane or the like, and is moved so that the joint holes 6 at both ends of the boom 5 come to positions facing the front end bosses 231 of the both electric clamp devices 23.

  Then, the operator operates the operation switch of the electric clamp device 23 to slide the tip boss 231 electrically and insert the tip boss 231 into the joint hole 6. Accordingly, the boom 5 is supported by chucking by the first and second workpiece rotation support devices 10A and 10B.

  In the present embodiment, electric power is supplied to the electric clamp device 23 installed on the rotating body 20 by the power cable 30, and the operator supports the boom 5 by electric operation only by pressing a switch instead of manually as in the prior art. It can be carried out.

  Subsequently, when performing welding work or the like on the boom 5, the operator operates the rotary drive device 17 to rotate the boom 5 to a desired posture so that the welding location comes to a position where the work can be easily performed. . In this embodiment, when the rotating body 20 is driven to rotate, the power cable 30 accommodated in the cable bear 35 is smoothly distorted in the rotating body cable guide 213 without being entangled or wound. The boom 5 can be rotated while being connected without being removed, and the working efficiency can be significantly improved as compared with the conventional case.

  As mentioned above, although embodiment of this invention was described in detail, this invention is not limited to embodiment mentioned above, A various deformation | transformation is possible within the range which does not deviate from the main point of this invention. For example, in the above-described embodiment, the boom is described as an example of a work that is rotatably held by the work reversing device. However, the work reversing device according to the present invention is a variety of other types such as a long iron pole. Needless to say, it can be used for workpieces.

  In the above embodiment, the gantry-side fixing part is installed near the inner diameter guide, and the rotating body-side fixing part is installed near the outer diameter guide. However, the gantry-side fixing part is rotated near the outer diameter guide. You may make it install a body side fixing | fixed part in the vicinity of an internal diameter guide.

  Further, in the above embodiment, as the electric support device installed on the rotating body to support the workpiece, a clamp device that performs chucking by inserting the tip boss into the joint hole of the workpiece from both sides is used. As long as it is an electric support device that can reliably support the workpiece such as a clamp device that contacts and supports the side surface of the workpiece from three directions, an electric support device having another configuration can be used as appropriate.

  In the above embodiment, the rotation position detecting means for detecting the rotation position of the rotating body employs a configuration in which the position detection pin installed on the rotating body side is detected by the position detection switch on the gantry side. Various configurations can be adopted as the rotational position detecting means, such as a device that detects the rotational position and a device that detects the rotational position in software in the control unit of the rotational drive device.

DESCRIPTION OF SYMBOLS 1 Work reversing device 5 Boom 6 Joint hole 10 Work rotation support device 11 Base 12 Base frame 13 Base cable guide 14 Support roller 17 Rotation drive device 18 Position detection switch 181 Reference position switch 182 +200 degree switch 183 -200 degree switch 185 Rotation Direction detection switch 19 Slide mechanism 20 Rotating body 21 Rotating ring casing 212 Through hole 213 Rotating body cable guide 214 Inner diameter guide 215 Outer diameter guide 217 Ring gear 23 Electric clamp device 231 Tip boss 25 Position detection pin 30 Power cable 301 Base side fixing portion 302 Rotating body side fixing part 35 Cable bear

Claims (6)

In a work reversing device including a work rotation support device that rotatably supports a work,
The work rotation support device is a base installed on the floor, supports a predetermined portion of the work and is rotatably supported by the base, and supplies power to the rotary body from the outside. A power cable, and
The mount is
A plurality of support members for rotatably supporting the rotating body;
A rotary drive device that is connected to the power cable and is a drive source that drives the rotary body to rotate; and the rotary body comprises:
A rotating ring housing supported by the support member;
An electric support device installed in the rotating ring housing and supporting the workpiece;
The work reversing device, wherein the rotation driving device limits a maximum rotation angle of the rotating body so that the power cable is not entangled with the rotation of the rotating body.   The limitation on the maximum rotation angle of the rotating body in the rotary drive device is set such that the total of the maximum rotation angles in the left and right directions from the predetermined reference position of the rotating body is 420 ° or less. The work reversing device according to claim 1. The rotator is a rotator cable guide for extending the power supply cable in an arc shape, and extends on an inner diameter side circumference and an outer diameter side circumference. A rotating body cable guide having an outer diameter guide;
The work reversal according to any one of claims 1 to 3, wherein the power cable is accommodated in a state of being folded once in a region sandwiched between the inner diameter guide and the outer diameter guide. apparatus.   4. The work reversing device according to claim 3, further comprising a cable bearer that houses and supports the power cable in a region sandwiched between the inner diameter guide and the outer diameter guide.   The power cable is fixed to the gantry side in the gantry side fixing portion installed in the vicinity of one of the inner diameter guide or the outer diameter guide, and is installed in the vicinity of the other of the inner diameter guide or the outer diameter guide. 5. The work reversing device according to claim 3, wherein the rotating body side fixing portion is fixed to the rotating body side.   The gantry further includes position detection means for detecting a rotation position of the rotating body, and the rotation driving device limits a rotation angle of the rotating body based on an output of the position detection means. The work reversing device according to any one of claims 1 to 5.

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