Workpiece reversing device

Abstract

The objective is to provide a workpiece reversing device with a simple structure that reduces manufacturing costs. [Solution] The workpiece reversing device of the present invention comprises a pair of left and right circular rotor plates (2) that support both left and right end faces of a workpiece (1), a machine frame (3) that rotatably supports the rotor plates (2), and a fixing device (4) that detachably fixes the workpiece (1) and the rotor plates (2).

Description

Technical Field

[0001] The present invention relates to a work inversion device for inverting a work such as a mold including a press mold.

Background Art

[0002] For example, the progressive die device (press working device) described in Japanese Unexamined Patent Application Publication No. 2023-132233 (Patent Document 1) includes an upper die and a lower die, and the upper die and the lower die press a strip-shaped metal plate (electromagnetic steel sheet) that is progressively fed in a predetermined direction to form a core piece having an annular yoke portion and a plurality of teeth portions that protrude along the radial direction from the yoke portion.

[0003] The die (upper die, lower die) of the high-speed punching press had a special rectangular parallelepiped shape that was long in the feeding direction of the metal plate, rather than a substantially cubic shape like the die of an injection molding machine.

[0004] For maintenance, the die is removed from the press and turned upside down for repair and adjustment.

[0005] Conventionally, the inversion operation of the above die was carried out by suspending the die with an overhead crane and the operator manually performing the inversion operation, which was a dangerous operation.

[0006] Therefore, the applicant of the present application proposed the one described in Japanese Unexamined Patent Application Publication No. 2024-019742 (Patent Document 2) as a die inversion device used for the maintenance of the above die.

[0007] This conventional die inversion device had a holding portion that held both left and right sides of the die and rotated to invert the upper and lower surfaces of the die. This die inversion device had a fixed machine frame fixed to the base and a movable machine frame provided movably in the left-right direction on the base. Rotating shafts were rotatably provided on the same axis in the left-right direction on the fixed machine frame and the movable machine frame. Holding portions for holding the die were provided at the inner ends of the respective rotating shafts.

Prior Art Documents

[0008] [Patent Document 1] Japanese Patent Publication No. 2023-132233 [Patent Document 2] Japanese Patent Publication No. 2024-019742 [Overview of the Initiative] [Problems that the invention aims to solve]

[0009] The invention described in Patent Document 2 above had the problem of having a complex structure and high manufacturing costs, as it supported the mold so that it could rotate freely with a holding part provided at the inner end of the rotating shaft. Therefore, the present invention aims to provide a workpiece inversion device for inverting workpieces such as molds, which has a simple structure and can reduce manufacturing costs, in order to solve the aforementioned conventional problems. [Means for solving the problem]

[0010] To achieve the above objective, the present invention employs the following means. Specifically, the workpiece reversing device of the present invention comprises a pair of left and right circular rotor plates that support both left and right end faces of a workpiece, a machine frame that rotatably supports the rotor plates, and a fixing device that detachably fixes the workpiece and the rotor plates.

[0011] The machine frame preferably consists of a fixed machine frame fixed to a base provided on the floor and a movable machine frame that is movably mounted on the base, with one of the pair of rotor plates supported by the fixed machine frame and the other supported by the movable machine frame.

[0012] Preferably, the fixed frame is provided with a drive device for rotating the rotor plate.

[0013] Preferably, the rotary plate has support rollers arranged at predetermined intervals in the circumferential direction along its circular outer surface, and a support plate provided on the machine frame, with an inner surface having an arc shape, which supports the support rollers.

[0014] Preferably, the rotor plate has a pair of side plates arranged in parallel with a predetermined distance between them, the support rollers are positioned between the side plates, and the support rollers are rotatably fitted onto shafts provided on the side plates.

[0015] The drive device preferably has a sprocket that meshes with the support roller.

[0016] The fixing device preferably has an engaging portion provided on the rotor plate and engaged portions provided on the left and right ends of the workpiece that engage with the engaging portion in a manner that allows for detachable engagement.

[0017] The engaged portion has an adapter with screw holes attached to the left and right end faces of the workpiece, and the engaged portion can be configured to include an adapter receiver provided on the inner surface of the rotor plate to receive and support the adapter from above, a pair of bolt insertion holes provided on the center line of the circular rotor plate and on both sides of the center, and fixing bolts that are inserted into the bolt insertion holes and screwed into the screw holes to fix the workpiece to the rotor plate.

[0018] The engaged portion has flat mounting portions provided on the lower surfaces of both ends of the workpiece and screw holes formed on both end surfaces of the workpiece, and the engaged portion can be configured to have a receiving block provided on the inner surface of the rotor plate to support the mounting portions, a pair of bolt insertion holes formed on the center line of the circular rotor plate and on both sides of the center, and bolts that are inserted through the bolt insertion holes and screwed into the screw holes to fix the workpiece to the rotor plate. [Effects of the Invention]

[0019] According to the present invention, by using a "rotor plate" instead of the "rotating shaft" described in the conventional Patent Document 2, the structure of the workpiece inversion device is simplified, and the manufacturing cost can be reduced.

Brief Description of the Drawings

[0020] [Figure 1] FIG. 1 is a front view of a workpiece inversion device showing a first embodiment of the present invention, and is a drawing before mounting a workpiece (die). [Figure 2] FIG. 2 is a front view after mounting the die. [Figure 3] FIG. 3 is a plan view of FIG. 2. [Figure 4] FIG. 4 is a sectional view taken along line A - A of FIG. 3. [Figure 5] FIG. 5 is an enlarged view of part B of FIG. 4. [Figure 6] FIG. 6 is a sectional view taken along line C - C of FIG. 2. [Figure 7] FIG. 7 is a sectional view taken along line D - D of FIG. 2. [Figure 8] FIG. 8 is a right side view of FIG. 2. [Figure 9] FIG. 9 is a sectional view of a support roller. [Figure 10] FIG. 10 is a perspective view of an adapter and an adapter receiver. [Figure 11] FIG. 11 is a side view showing a second embodiment of the present invention. [Figure 12] FIG. 12 is a sectional view taken along line E - E of FIG. 11. [Figure 13] FIG. 13 is a detailed view of a fixing device according to a third embodiment of the present invention. [Figure 14] FIG. 14 is a front view showing a fourth embodiment of the present invention. [Figure 15] FIG. 15 is a left side view of FIG. 14. [Figure 16] FIG. 16 is a sectional view taken along line F - F of FIG. 14. [Figure 17] FIG. 17 is an enlarged view of part G of FIG. 16. [Figure 18]Figure 18(a) shows a configuration with four pins installed, and Figure 18(b) shows a configuration with two pins installed on the inside. [Figure 19] Figure 19 is an explanatory diagram showing the specification for operating the pin hydraulically. [Figure 20] This is a perspective view of a first embodiment of the present invention. [Modes for carrying out the invention]

[0021] The embodiments of the present invention will be described below with reference to the drawings. In the following, a press die will be used as an example of a "workpiece" that is an object to be inverted, such as a mold. Of course, the "workpiece" is not limited to the press die used in this explanation. Figures 1 to 10 and Figure 20 relate to a first embodiment of the present invention. The workpiece reversing device of the present invention is exemplified as a 180-degree reversing machine for molds and the like. This reversing machine comprises a pair of left and right circular rotor plates 2 that support both left and right ends of a press mold 1, a machine frame 3 that rotatably supports the rotor plates 2, and a fixing device 4 that detachably fixes the workpiece mold 1 and the rotor plates 2.

[0022] Note that "left-right" refers to the left-right direction (the length direction of the mold) in Figure 1. Also, "front-back," which will be discussed later, refers to the direction in the state shown in Figure 1.

[0023] The machine frame 3 consists of a fixed machine frame 3a fixed to a base 5 provided on the floor, and a movable machine frame 3b that is movably mounted on the base 5. An LM guide 6 provided at the bottom of the movable machine frame 3b is movably mounted on a guide rail 7 provided on the base 5 in the left-right direction.

[0024] One of the pair of rotor plates 2 is supported by a fixed frame 3a, and the other is supported by a mobile frame 3b. A drive device 8 for rotating the rotor plate 2 is provided on the fixed frame 3a.

[0025] As shown in Figure 3, the mold 1 has a rectangular flat plate shape and has width (front-to-back direction), length (left-to-right direction), and thickness (up-to-down direction). These dimensions of the mold 1 can vary, and the mobile frame 3b is configured to move according to the length. A stopper (not shown) is provided to fix the mobile frame 3b in a predetermined position. The movement of the mobile frame 3b is performed manually, but it can also be powered by a motor or cylinder.

[0026] As shown in Figures 4 to 9, support rollers 9 are arranged at predetermined intervals in the circumferential direction along the circular outer surface of the rotor plate 2. Support plates 10 with an arc-shaped inner surface that support these support rollers 9 are provided on the fixed machine frame 3a and the mobile machine frame 3b.

[0027] The rotor plate 2 has a pair of side plates 2a arranged parallel to each other with a predetermined distance between them in the left-right direction. A support roller 9 is positioned between these side plates 2a. The side plates 2a are circular discs.

[0028] As shown in Figure 9, the support roller 9 is rotatably fitted onto the shaft 11. A dry bearing 12 is interposed between the shaft 11 and the inner surface of the support roller 9, allowing the support roller 9 to rotate freely relative to the shaft 11. This shaft 11 is mounted through a pair of side plates 2a, and is prevented from detaching from the side plates 2a by retaining rings 13 on the left and right.

[0029] As shown in Figures 4 and 5, the fixed machine frame 3a has a pair of left and right frames 14 erected on the base 5, and a pair of left and right support plates 10 erected on the base 5 between the frames 14. The frames 14 and the support plates 10 are fixed together by fastening means (not shown). The upper surface of the support plate 10 is formed as an arc-shaped surface that is concave downwards, and this arc-shaped inner circumferential surface contacts the support roller 9, supporting the rotor plate 2 so that it can rotate freely. Note that the support plate 10 on the fixed machine frame 3a side is divided at the position of the sprocket 15, as shown in Figure 7.

[0030] The mobile machine frame 3b has a pair of left and right frames 14 erected on the LM guide 6, and a pair of left and right support plates 10 erected on the LM guide 6 between these frames 14. The frames 14 and the support plates 10 are fixed together by fastening means (not shown). The arcuate surface of the upper surface of the support plates 10 abuts against the support rollers 9, supporting the rotor plate 2 so that it can rotate freely. Note that the support plates 10 on the mobile machine frame 3b side are not divided because they do not have a sprocket 15, unlike the support plates on the fixed machine frame 3a side.

[0031] Furthermore, the support plate 10 is not limited to being composed of a pair of two plates; the number of plates is arbitrary, and it may be a single thick plate.

[0032] As shown in Figure 4, the upper part of the rotor plate 2 protrudes upward from the frame 14, but as shown in Figures 2 and 5, the protruding portion is covered by the cover 16.

[0033] As shown in Figures 1, 2 and 7, the drive unit 8 includes a motor 17 located inside the stationary frame 3a (on the mobile frame 3b side), a reduction gear 18 directly connected to the motor 17, and the sprocket 15 located on the output shaft 19 of the reduction gear 18. The reduction gear 18 is mounted on the stationary frame 3a. The sprocket 15 meshes with the support roller 9 at the lowest point of the rotor plate 2. Therefore, the circumferential arrangement pitch of the support roller 9 on the stationary frame 3a side is the same as the pitch of the teeth of the sprocket 15.

[0034] In this way, the diameter of the sprocket 15 can be made smaller than the diameter of the rotor plate 2, which allows the motor 17 to be miniaturized and costs to be reduced.

[0035] Furthermore, since the support rollers 9 of the rotor plate 2 on the mobile frame 3b side do not mesh with the sprocket 15, their arrangement pitch is not constrained by the tooth pitch of the sprocket 15, and the spacing can be made wider.

[0036] As shown in Figures 4 to 8, the fixing device 4 has an engaging portion 20 provided on the rotor plate 2 and engaged portions 21 provided on the left and right ends of the mold 1, which is the workpiece, and the two are engaged so that they can be engaged and disengaged.

[0037] The engaged portion 21 has adapters 22 attached to the left and right end faces of the mold 1. The adapters 22 protrude outward in the left and right directions from the end faces of the mold 1, and screw holes 23 are formed on these protruding end faces with a left-right axis (see Figure 6).

[0038] As shown in Figure 5, the engaging portion 20 has an adapter receiver 24 provided on the inner surface of the rotor plate 2 that receives and supports the adapter 22 from above (see also Figure 10).

[0039] As shown in Figures 6 and 7, the engaging portion 20 has a pair of bolt insertion holes 25 provided on the center line of the circular rotor plate 2 and at symmetrical positions on both the front and rear sides of the center, and fixing bolts 26 that are inserted into these bolt insertion holes 25 and screwed into the threaded holes 23 of the adapter 22 to fix the mold 1 to the rotor plate 2.

[0040] The operation of the first embodiment described above will now be explained. Figure 1 shows the state in which the mold 1, which is the workpiece, is suspended by a wire 27 from a crane, and is positioned above the space between the left and right fixed machine frames 3a and the mobile machine frame 3b. The mobile machine frame 3b is positioned and waiting to match the length of the mold 1. The crane is operated so that the adapters 22, which are the engaged parts 21 protruding from both the left and right ends of the mold 1, are positioned above the lower adapter receivers 24, which are the engaged parts 20. Once the position of the mold 1 is determined, the mold 1 is lowered and the adapters 22 are placed on the adapter receivers 24.

[0041] As shown in Figure 5, the adapter receiver 24 attached to the end face of the rotor plate 2 is provided with a free zone 28 that allows the adapter 22 to move freely in the left-right direction. Within this range of movement, the left-right positioning of the mobile frame 3b is performed.

[0042] As shown in Figure 6, the fixing bolts 26 are inserted from the left and right outer sides of the fixed frame 3a and the movable frame 3b into the bolt insertion holes 25 provided in the rotor plate 2. By screwing the fixing bolts 26 of the engaging portion 20 into the screw holes 23 of the adapter 22 of the engaged portion 21 and tightening them, the end face of the adapter 22 is fixed in close contact with the end face of the rotor plate 2. At this time, the movable frame 3b moves by the amount of the free zone 28 of the adapter receiver 24. In this mold fixing position, the movable frame 3b is fixed to the base 5. The wire 27 is removed from the mold 1 and the installation work is completed (see Figure 2).

[0043] After the installation work is completed, the drive unit 8 is started to rotate the sprocket 15 shown in Figure 7, which in turn rotates the rotor plate 2 that meshes with the sprocket 15, and inverts the mold 1 by 180 degrees. The rotation of the rotor plate 2 is supported by the support plate 10 which is in contact with the support roller 9. In this inverted state, maintenance of the mold 1 can be performed on the inverting machine.

[0044] To remove mold 1 from the inverting machine in the inverted state, first, the crane wire 27 is attached to mold 1, the position fixing of the mobile frame 3b is released, the fixing bolts 26 are loosened and removed from the adapter 22. Then, the wire 27 is loosened to lower mold 1 slightly, and the mobile frame 3b is moved to a position where the adapter receiver 24 and the adapter 22 do not interfere with each other. After that, mold 1 is lifted by the crane and transported to the maintenance work position.

[0045] Figures 11 and 12 show a second embodiment of the present invention. The difference from the first embodiment is that the configuration of the engaging portion 20 and the engaged portion 21 of the fixing device 4 is different. Therefore, the configuration of the engaging portion 20 and the engaged portion 21 will be described below, and other descriptions will refer to the first embodiment.

[0046] The engaged portion 21 has flat mounting portions 29 provided on the lower surfaces of both the left and right ends of the mold 1, and screw holes 30 formed on both the left and right end surfaces of the mold 1. These screw holes 30 are formed on the end surfaces of the mold 1 with an axis in the left-right direction.

[0047] The engaging portion 20 has a receiving block 31 provided on the inner surface of the rotor plate 2 to support the mounting portion 29. The engaging portion 20 also has a pair of bolt insertion holes 32 formed on the center line of the circular rotor plate 2 and at symmetrical positions on both the front and rear sides of the center, and fixing bolts 33 that are inserted through these bolt insertion holes 32 and screwed into the screw holes 30 of the engaged portion to fix the mold 1 to the rotor plate 2.

[0048] According to the second embodiment, the adapter 22 of the first embodiment is not required, but the other effects and advantages are the same.

[0049] Figure 13 shows a third embodiment of the present invention, which differs from the first embodiment in that the fixing bolt 26 of the engaging portion 20 of the fixing device 4 is replaced with a piston pin 35 of the cylinder 34, and the screw hole 23 of the adapter 22 of the engaged portion 21 is made into a pin insertion hole 36 that can be detachably fitted to the piston pin 35.

[0050] In this third embodiment, a cylinder 34 having an axis in the left-right direction is provided on the rotor plate 2, and a piston pin 35 that extends and retracts from the end face of the rotor plate 2 is fitted into this cylinder 34.

[0051] The operation of the third embodiment will now be described. With the piston pin 35 in a position where it does not protrude from the end face of the rotor plate 2, the mold 1, which is suspended by a crane, is lowered so that the adapter 22 is supported by the adapter receiver 24. Then, while moving the mobile machine frame 3b toward the fixed machine frame 3a, the piston pin 35, which is the engaging part 20, is made to protrude from the cylinder 34 and inserted into the pin insertion hole 36 of the adapter 22, which is the engaged part 21, so that the end face of the adapter 22 and the end face of the rotor plate 2 are in close contact. After that, the position of the mobile machine frame 3b is fixed.

[0052] Furthermore, the engaging portion 20 can be replaced with a pin that extends and retracts via a solenoid or a pin that extends and retracts via a screw, instead of the piston pin 35 that extends and retracts via the cylinder 34.

[0053] Figures 14 to 18 show a fourth embodiment of the present invention. In Figure 14, the frame 14 (see Figure 4) is omitted from the illustration, but the rotor plate 2 is rotatably supported by the machine frame 3, just as in Figure 4, and the configuration of the fixing device 4 differs from the above embodiment.

[0054] In this fourth embodiment, the engaging portion 20 of the fixing device 4 has a pin 37 provided on the rotor plate 2. The engaged portion 21 has adapter plates 38 attached to both left and right end faces of the mold 1.

[0055] As shown in Figure 15, four pins 37, which are the engaging portion 20, are provided on the center line of the circular rotor plate 2, at symmetrical positions on both the front and rear sides with respect to the center.

[0056] The adapter plate 38, which is the engaged portion 21, is made of plate material and is attached to the end face of the mold 1 by bolts 39. The adapter plate 38 has an inverted U-shaped first elongated hole 40 that opens downward and to the left and right, and a U-shaped second elongated hole 41 that opens upward and to the left and right. There is a pair of first elongated holes 40, one in the front and one in the back. There is a pair of second elongated holes 41, one in the front and one in the back, inside the first elongated holes 40. These first elongated holes 40 and second elongated holes 41 are positioned so that they can be detachably engaged with the four pins 37 of the engaging portion 20.

[0057] As shown in Figures 16 and 17, a nut 42 is provided on the rotor plate 2. A pin 37 is screwed into the female thread of the nut 42, and the tip of the pin 37 protrudes from the end face of the rotor plate 2 and engages with the first elongated hole 40 or the second elongated hole 41.

[0058] The operation of the fourth embodiment will now be explained. As shown in Figures 14 and 15, the mold 1 is suspended by a crane wire 27. As shown in Figure 16, the pin 37 of the engaging portion 20 is screwed into the nuts 42 on both outer sides, with the tip of the pin 37 protruding from the end face of the rotor plate 2. The pin 37 is not screwed into the two inner nuts 42.

[0059] In this state, the mold 1 is lowered, and the mobile frame 3b is brought closer to the fixed frame 3a, while engaging the front and rear pins 37 with the first elongated holes 40. The pins 37 of the engaging portion 20 and the first elongated holes 40 of the engaged portion 21 are fully engaged, and the adapter plate 38 and the rotor plate 2 are brought into close contact, locking the movement of the mobile frame 3b.

[0060] Next, as shown in Figure 18(a), the pin 37 is screwed into the two inner nuts 42, and the tip of the pin 37 is engaged with the second elongated hole 41. In this state, the rotor plate 2 is rotated to invert the mold 1 by 180 degrees.

[0061] After inversion, to remove the mold 1 from the inversion machine, as shown in Figure 18(b), the two outer pins 37 are removed from the nuts 42, the lock on the mobile frame 3b is released, the contact between the adapter plate 38 and the rotor plate 2 is loosened, and the mold 1 can be lifted by the crane wire 27.

[0062] According to this fourth embodiment, removing the mold 1 from the reversing machine after mold reversal can be done more easily than in the above embodiments.

[0063] Figure 19 shows a modified version of the fourth embodiment, in which the screw-type pin 37 is replaced with a piston pin 44 that extends and retracts in the cylinder 43.

[0064] Specifically, a cylinder block 45 is provided on the end face of the rotor plate 2. Four cylinders 43 are formed in this cylinder block 45, and a piston pin 44 is provided in each cylinder 43. The tip of the piston pin 44 is configured to protrude from the end face of the rotor plate 2. A rotary joint 46 for supplying a pressure medium to each cylinder 43 is provided in the block 45. An external pressure medium supply source (not shown) is connected to the rotary joint 46.

[0065] In this modified version of the fourth embodiment, the piston pin 44 that extends and retracts in the cylinder 43 can be replaced with a pin that extends and retracts in the solenoid.

[0066] The present invention is not limited to the embodiments shown above. For example, the reversal angle is not limited to 180 degrees, and can be arbitrary. The rotor plate 2 is not limited to being composed of a pair of side plates 2a, but can also be made by forming a groove on the outer surface of a single disc and arranging the support roller 9 in the groove. Furthermore, the drive device 8 is not limited to one in which the sprocket 15 meshes with the support roller 9, but may also rotate the rotor plate 2 using a chain or belt transmission mechanism.

[0067] The scope of the present invention is indicated by the claims rather than the above description, and all modifications within the meaning and scope equivalent to the claims are included. [Explanation of Symbols]

[0068] 1. Workpiece (mold) 2 rotor plates 2a side plate 3 machine frame 3a Fixed frame 3b Mobile Unit Frame 4 Fixing device 5 bases 6 LM guides (linear motion guides) 7 Guide rails 8. Drive system 9. Support roller 10 Support Plate 11 shafts 12 dry bearings 13 Retaining ring 14 frames 15 sprocket 16 Cover 17 Motor 18 Reducer 19 Output shaft 20 Engaging part 21 Engaged portion 22 adapters 23 screw holes 24 Adapter receiver 25 Bolt insertion holes 26 Fixing bolts 27 wires 28 Free Zone 29 Mounting part 30 screw holes 31 Receiving Block 32 bolt insertion holes 33 Fixing bolts 34 cylinders 35 Piston pins 36 Pin insertion holes 37 pins 38 Adapter Plate 39 volts 40 1st long hole 41 2nd long hole 42 nuts 43 cylinders 44 Piston pins 45 Cylinder Block 46 Rotary Joint 47 screws

Claims

1. A pair of circular rotor plates supporting both the left and right ends of the workpiece, A machine frame that rotatably supports the rotor plate, A fixing device for detachably fixing the workpiece and the rotor plate, A workpiece reversing device.

2. The aforementioned machine frame consists of a fixed machine frame fixed to a base provided on the floor and a movable machine frame that is movably mounted on the base. The workpiece reversing device according to claim 1, wherein one of the pair of rotor plates is supported by the fixed machine frame and the other is supported by the mobile machine frame.

3. The workpiece reversing device according to claim 2, wherein the fixed machine frame is provided with a drive device for rotating the rotor plate.

4. Support rollers are arranged at predetermined intervals in the circumferential direction along the circular outer surface of the rotary plate, The workpiece inversion device according to claim 3, further comprising a support plate provided on the machine frame and having an arc-shaped inner surface that supports the support roller.

5. The rotor plate has a pair of side plates arranged in parallel with a predetermined distance between them, The support roller is positioned between the side plates. The workpiece reversing device according to claim 4, wherein the support roller is rotatably fitted onto a shaft provided on the side plate.

6. The workpiece reversing device according to claim 4, wherein the drive device has a sprocket that meshes with the support roller.

7. The workpiece reversing device according to claim 6, wherein the fixing device has an engaging portion provided on the rotor plate and engaged portions provided on the left and right ends of the workpiece that engage with the engaging portion in a manner that allows for detachable engagement.

8. The engaged portion has an adapter with screw holes attached to the left and right end faces of the workpiece. The workpiece reversing device according to claim 7, wherein the engaging portion comprises an adapter receiver provided on the inner surface of the rotor plate for receiving and supporting the adapter from above, a pair of bolt insertion holes provided on the center line of the circular rotor plate and on both sides of the center, and fixing bolts inserted into the bolt insertion holes and screwed into the screw holes for fixing the workpiece to the rotor plate.

9. The engaged portion has a flat mounting portion provided on the lower surface of both ends of the workpiece, and screw holes formed on both end surfaces of the workpiece. The workpiece reversing device according to claim 7, wherein the engaging portion comprises a receiving block provided on the inner surface of the rotor plate to support the mounting portion, a pair of bolt insertion holes formed on the center line of the circular rotor plate and on both sides of the center, and bolts inserted through the bolt insertion holes and screwed into the screw holes to fix the workpiece to the rotor plate.

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