JP5118781B1 - Work transfer device with pallet fixing mechanism - Google Patents

Abstract

The present invention provides a work transfer device having a pallet fixing mechanism for correcting and preventing the inclination of a work transfer pallet placed on a pallet cradle.
A workpiece conveying device includes a pallet receiving base having a pallet receiving surface on which a workpiece conveying pallet is exchangeably and positionably mounted, and a pallet fixing mechanism for fixing the workpiece conveying pallet to the pallet receiving surface. 8. When the work transport pallet 3 is mounted on the pallet receiving surface 41 and the fixing arms 81A and 81B of the pallet fixing mechanism 8 are pressed, the fixed arms fix the work transport pallet 3 to the pallet receiving surface 41 by a spring force. Is formed. When the workpiece transfer pallet 3 is lifted and removed from the pallet receiving surface 41, the fixed arms 81A and 81B are pushed up and automatically returned to the retracted positions A1 and B1 by the spring force.
[Selection] Figure 1

Description

  The present invention relates to a work transfer device attached to an automatic processing machine that performs processing such as polishing and grinding on a work such as a lens. More specifically, the present invention relates to a pallet fixing mechanism that fixes a workpiece conveyance pallet including a plurality of workpiece placement units to a receiving table such as an indexing table.

  Patent Document 1 proposes a workpiece transfer device of a lens processing apparatus that performs lens polishing, grinding, and the like. The workpiece transfer device disclosed in this document includes a disk-shaped workpiece transfer pallet provided with a workpiece placement unit on which a plurality of workpieces are placed, and a pallet base on which the workpiece transfer pallet can be replaced and positioned. Rotating means for rotationally driving the pallet cradle and moving means for moving the pallet cradle horizontally.

  The workpiece conveyance pallet is positioned by positioning pins and positioning holes. For example, a positioning hole is formed in the workpiece conveyance pallet, and a positioning pin is attached to the pallet receiving surface of the pallet receiving table. These are detachably mounted with an appropriate fit, and the work transport pallet is mounted in a state of being positioned on the pallet receiving surface.

Utility Model Registration No. 3038525

  In the workpiece conveyance device having this configuration, the workpiece conveyance pallet is conveyed by the rotation unit and the movement unit, and one of the plurality of workpiece placement units is attached to the tip of the workpiece shaft of the lens processing apparatus. Is positioned. The workpiece is transferred between the positioned workpiece placing portion and the workpiece holding portion of the lens processing apparatus.

  The workpiece conveyance pallet may be inclined with respect to the workpiece mounting surface. When the workpiece is delivered, the workpiece holding portion of the lens processing apparatus approaches the workpiece placement portion of the workpiece conveyance pallet from a direction whose central axis is perpendicular to the workpiece placement surface. If the workpiece transfer pallet is tilted with respect to the workpiece placement surface of the pallet cradle, the workpiece delivery may be hindered.

  In view of this point, an object of the present invention is to propose a workpiece conveyance device including a pallet fixing mechanism that can correct and prevent the inclination of a workpiece conveyance pallet placed on a pallet cradle.

  In order to solve the above-described problems, a workpiece transfer device according to the present invention includes a workpiece transfer pallet in which a plurality of workpiece placement units are arranged in the same circle, and a pallet receiving surface on which the workpiece transfer pallet can be replaced and positioned. And a pallet fixing mechanism for fixing the workpiece transfer pallet to the pallet receiving surface.

  The pallet fixing mechanism includes a fixed arm that fixes the work conveyance pallet to the pallet receiving surface of the pallet cradle, and an urging member that urges the fixed arm. The fixed arm can pivot between the pallet fixing position and the retracted position. The pallet fixing position is a position where the fixed arm presses the workpiece transfer pallet against the pallet receiving surface and is fixed to the pallet receiving surface. The retreat position is the position where the fixed arm is separated from the workpiece transfer pallet and receives the pallet receiving It is a position that does not interfere with the workpiece transfer pallet that is attached to and detached from the surface.

  The urging member applies an urging force in a direction of turning to the fixed position with respect to the fixed arm while the fixed arm is turned to a midway turning position on the way from the fixed position to the retracted position. While the fixed arm turns from the retracted position to the midway turning position, an urging force in the direction of turning to the retracted position is applied to the fixed arm.

  Further, the fixed arm at the fixed position can be swung to a position exceeding the midway swivel position by the workpiece transfer pallet removed from the pallet receiving surface.

  The workpiece conveyance pallet is placed in a state of being positioned with respect to the pallet receiving surface of the pallet receiving table by the positioning unit. In this state, the fixed arm of the pallet fixing mechanism is turned from the retracted position to the fixed position against the urging force of the urging member. The fixed arm is in a state in which the workpiece conveying pallet is pressed against the workpiece receiving surface by the urging force of the urging member. As a result, the workpiece transfer pallet is fixed to the pallet receiving surface, and the workpiece transfer pallet can be prevented from being inclined with respect to the pallet receiving surface.

  Further, when removing the workpiece transfer pallet from the pallet cradle, the workpiece transfer pallet is lifted from the pallet receiving surface. The workpiece transfer pallet forcibly turns the fixed arm in the direction toward the retracted position against the urging force. The fixed arm is turned by the workpiece transfer pallet to a position exceeding the midway turning position. When the turning position is exceeded, the urging force of the urging member acts on the fixed arm in the opposite direction until then. The fixed arm is turned to the retracted position by the urging force and is held at the retracted position. Therefore, it is not necessary to separately perform an operation of switching the fixed arm from the pallet fixing position to the retracted position.

  The fixed arm in the retracted position does not interfere with the workpiece transfer panel that is attached to and detached from the pallet receiving surface. When the work conveyance pallet is placed on the pallet receiving surface, the fixed arm does not get in the way, and the operation of the fixed arm is unnecessary.

  Since the workpiece conveyance device of the present invention includes the pallet fixing mechanism, the posture of the workpiece conveyance pallet mounted on the pallet cradle can be always maintained in an appropriate state. Therefore, the workpiece can be transferred to and from the workpiece machining apparatus without any trouble.

  Further, the fixing arm of the pallet fixing mechanism is moved from the pallet fixing position to the retracted position by the work conveying pallet. The fixed arm in the retracted position does not interfere with the workpiece transfer pallet that is attached to and detached from the pallet receiving surface. Therefore, the operation of the pallet fixing mechanism can be minimized, and the work can be simplified.

It is a perspective view which shows the principal part of the workpiece conveyance apparatus to which this invention is applied. It is sectional drawing of the workpiece conveyance apparatus of FIG. It is explanatory drawing which shows the state of the pallet fixing mechanism before workpiece | work conveyance pallet mounting | wearing. It is explanatory drawing which shows the state of the pallet fixing mechanism at the time of workpiece | work conveyance pallet mounting | wearing. It is explanatory drawing which shows the state of the pallet fixing mechanism at the time of workpiece conveyance pallet fixation.

  Embodiments of a workpiece transfer apparatus to which the present invention is applied will be described below with reference to the drawings.

  FIG. 1 is a perspective view showing a work transfer device according to the present embodiment, and shows a pallet attaching / detaching portion provided with a lens fixing mechanism. FIG. 2 is a cross-sectional view of a pallet attaching / detaching portion provided with a lens fixing mechanism.

  The workpiece transfer device 1 carries the lens 2 to be processed into the lens processing device 100 and carries out the processed lens 2 from the lens processing device 100. The lens processing apparatus 100 includes a work holding unit 101 that transfers the lens 2 to and from the work transfer apparatus 1. The work holding unit 101 is coaxially attached to the end of a work shaft (not shown). Since the lens processing apparatus 100 has a general configuration for polishing and grinding a lens, a detailed description thereof will be omitted.

  The workpiece transfer device 1 rotates a disk-shaped workpiece transfer pallet 3, a pallet attaching / detaching unit 4 that is mounted in a state where the workpiece transfer pallet 3 can be exchanged and positioned, and a workpiece transfer pallet 3 attached to the pallet attaching / detaching unit 4. A workpiece indexing mechanism 5, a workpiece feeding mechanism 6 for reciprocating the workpiece transport pallet 3 mounted on the pallet attaching / detaching unit 4 along a linear reciprocating path, and a controller 7 for controlling the operation of each unit. Yes.

  The workpiece conveyance pallet 3 includes a plurality of workpiece placement units 31 having the same configuration. The work placement units 31 are arranged at equiangular intervals on the same circle centered on the center of the work transport pallet 3. For example, six workpiece placement units 31 are arranged. Each work placement portion 31 is a through hole in which a ring-shaped work tray 32 on which the lens 2 is placed is attached in a detachable state. Instead of this, a part corresponding to the work tray 32 may be formed integrally with the work placement unit 31 so that the lens 2 can be directly attached and detached.

  A center through hole 33 is formed in the work conveyance pallet 3. A through hole is also formed at a position off the center of the work conveyance pallet 3, and this through hole is a positioning pin hole 34.

  The pallet attaching / detaching unit 4 includes a pallet receiving table 42 having a pallet receiving surface 41 on which the work transfer pallet 3 is placed, a positioning unit 43 for positioning the work transfer pallet 3 on the pallet receiving surface 41, and a work transfer pallet on the pallet receiving surface 41. A pallet fixing mechanism 8 for fixing 3 is provided. The pallet receiving surface 41 is a flat surface orthogonal to the central axis 42 a of the pallet receiving table 42.

  The positioning portion 43 is a positioning pin that protrudes vertically from the pallet receiving surface 41. The positioning pin is located at a position deviated from the central axis 42a, and is detachably attached to the pin hole 34 of the work conveying pallet 3 with an appropriate fit. Thus, the workpiece transfer pallet 3 is mounted in a state of being positioned with respect to the pallet receiving surface 41.

  At the center of the pallet receiving surface 41, a protruding portion 44 having a length that can penetrate the center through hole 33 of the workpiece conveying pallet 3 is formed. The protruding portion 44 protrudes vertically from the pallet receiving surface 41. The tip portion 44 a of the protruding portion 44 is a portion exposed from the central through hole 33 of the workpiece conveyance pallet 3 when the workpiece conveyance pallet 3 is placed on the pallet receiving surface 41 in a positioned state.

  The workpiece indexing mechanism 5 rotates the pallet cradle 42 around its central axis 42a. The pallet receiving table 42 is rotated, and each workpiece placement portion 31 of the workpiece conveyance pallet 3 mounted thereon is positioned at a predetermined angular position on the same circle (performs an indexing operation). The workpiece indexing mechanism 5 supports the pallet cradle 42 in a state of being rotatable around its central axis, feed table 51, index motor 52 mounted on feed platform 51, and rotation of index motor 52. Is provided with a chain-type, belt-type or gear transmission-type transmission portion 53 that transmits the pallet to the pallet receiving base 42.

  The workpiece feeding mechanism 6 performs a workpiece feeding operation for moving the pallet receiving table 42 in a direction perpendicular to the central axis 42a. The work feed mechanism 6 is a drive of a support frame 61 that supports the feed base 51 in a slidable manner in the feed direction, and a cylinder mounted on the support frame 61 for sliding the feed base 51 in the feed direction. Part 62.

  FIG. 3 is an explanatory view showing a state before the work conveying pallet 3 is mounted on the pallet receiving surface 41. FIG. 4 is an explanatory view showing a state when the work conveyance pallet 3 is mounted on the pallet receiving surface 41. FIG. 5 is an explanatory view showing a state in which the workpiece transfer pallet 3 is fixed to the pallet receiving surface 41 by the pallet fixing mechanism 8.

  The structure of the pallet fixing mechanism 8 will be described with reference to FIGS. The pallet fixing mechanism 8 urges each of the first fixed arm 81A and the second fixed arm 81B for fixing the workpiece conveying pallet 3 to the pallet receiving surface 41, and the first and second fixed arms 81A and 81B. A first tension coil spring 82A and a second tension coil spring 82B are provided. The rear end portions of the first and second fixed arms 81A and 81B are supported by the first arm support shaft 83A and the second arm support shaft 83B in a rotatable state, respectively. The first arm support shaft 83 </ b> A and the second arm support shaft 83 </ b> B are attached to the tip end portion 44 a of the protruding portion 44 formed on the pallet receiving surface 41.

  The first fixed arm 81A can pivot between the pallet fixing position A3 shown in FIG. 5 (FIG. 3) and the retracted position A1 shown in FIGS. The pallet fixing position A3 is a position where the first fixed arm 81A presses the workpiece conveyance pallet 3 against the pallet receiving surface 41 and fixes it to the pallet receiving surface 41. The retreat position A1 is a position where the first fixed arm 81A is away from the workpiece transfer pallet 3. The first fixed arm 81A at the retracted position A1 does not interfere with the workpiece conveyance pallet 3 attached to and detached from the pallet receiving surface 41 in the vertical direction. Further, the first fixed arm 81A at the fixed position A3 is swung to a position exceeding the midway turn position A2 by the workpiece transfer pallet 3 removed from the pallet receiving surface 41.

  The second fixed arm 81B is configured in the same manner, and can turn between the pallet fixing position B3 shown in FIG. 5 (FIG. 3) and the retracted position B1 shown in FIGS. The pallet fixing position B3 is a position where the second fixing arm 81B presses the workpiece transfer pallet 3 against the pallet receiving surface 41 and fixes it to the pallet receiving surface 41. The retreat position B1 is a position where the second fixed arm 81B is separated from the work transport pallet 3. The second fixed arm 81B at the retracted position B1 does not interfere with the workpiece conveyance pallet 3 attached to and detached from the pallet receiving surface 41 in the vertical direction. Further, the second fixed arm 81B at the fixed position B3 is turned to a position exceeding the turning intermediate position B2 by the workpiece transfer pallet 3 removed from the pallet receiving surface 41.

  The first fixed arm 81A is formed with a projecting portion that projects at a right angle to the tip portion, and the tip surface is a convex curved surface 84A for pressing the pallet. At the fixed position A3, the convex curved surface 84A is pressed against the surface 3a of the workpiece conveying pallet 3. Similarly, the second fixed arm 81B is formed with a projecting portion projecting at a right angle to the tip portion, and the tip surface is a convex curved surface 84B for pressing the pallet. At the fixed position B3, the convex curved surface 84B is pressed against the surface 3a of the workpiece conveying pallet 3. In this example, the convex curved surfaces 84A and 84B are circular arc surfaces extending at an angle of about 180 degrees. Other convex curved surfaces are also possible.

  The first tension coil spring 82A is pulled between the cradle-side spring hook 45 attached to the tip portion 44a of the protrusion 44 and the first fixed arm-side spring hook 85A attached to the tip portion of the first fixed arm 81A. It is laid over in the state. Similarly, the second tension coil spring 82B is stretched between the cradle-side spring hook 45 and the second fixed arm-side spring hook 85B attached to the distal end portion of the second fixed arm 81B. . The cradle-side spring hook 45 is located in the middle of the first and second arm support shafts 83A and 83B and is located closer to the pallet receiving surface 41 than these.

  Here, as shown in FIG. 3, in the state where the first fixed arm 81A is in the retracted position A1, the line segment connecting the first fixed arm side spring hook 85A and the cradle side spring hook 45 is the first fixed arm 81A. Is located on the retracted position A1 side with respect to the first arm support shaft 83A. Conversely, as shown in FIG. 5, in a state where the first fixed arm 81A is at the fixed position A3, this line segment is positioned on the fixed position A3 side with respect to the first arm support shaft 83A. In a state where the first fixed arm 81A is in the turning midway position A2 between the retracted position A1 and the fixed position A3, this line segment passes through the first arm support shaft 83A.

  Therefore, the first tension coil spring 82A turns to the fixed position A3 with respect to the first fixed arm 81A while the first fixed arm 81A turns to the turning intermediate position A2 on the way from the fixed position A3 to the retracted position A1. Gives direction bias. Conversely, while the first fixed arm 81A is turning from the retracted position A1 to the turning intermediate position A2, an urging force in a direction of turning to the retracted position A1 is applied to the first fixed arm 81A.

  The first fixed arm 81A and the first tension coil spring 82A, and the second fixed arm 81B and the second tension coil spring 82A are arranged in a point-symmetric state with respect to the central axis 42a of the pallet receiving surface 41. The first and second arm support shafts 83A and 83B supporting the first and second fixed arms 81A and 81B are also arranged at point-symmetric positions. Accordingly, the second fixed arm 81B moves point-symmetrically with the first fixed arm 81A.

  That is, it is possible to turn from the fixed position B3 to the retracted position B1 via the turning middle position B2. The second fixed arm 81B at the fixed position B3 is swung to a position exceeding the midway turn position B2 by the workpiece transfer pallet 3 removed from the pallet receiving surface 41. Further, the second tension coil spring 82B turns to the fixed position B3 with respect to the second fixed arm 81A while the second fixed arm 81B turns to the turning intermediate position B2 on the way from the fixed position B3 to the retracted position B1. Gives direction bias. While the second fixed arm 81B is turning from the retracted position B1 to the midway turning position B2, an urging force in the direction of turning to the retracted position B1 is applied to the second fixed arm 81B.

  Next, the operation of the pallet fixing mechanism 8 will be described. As shown in FIG. 3, the work conveyance pallet 3 is mounted on the pallet receiving surface 41 from a direction perpendicular to the pallet receiving surface 41. Convex curved surfaces 84A and 84B (R shape) are provided at the tip portions of the first and second fixed arms 81A and 81B. When the workpiece conveying pallet 3 is mounted on the pallet receiving surface 41, the convex curved surfaces 84A and 84B of the first and second fixed arms 81A and 81B slide along the inner peripheral edge portion of the center through hole 33 of the pallet. The workpiece carrying pallet 3 can be mounted smoothly.

  As shown in FIG. 4, the work transport pallet 3 is mounted on the pallet receiving surface 41 so that the positioning portion 43 (positioning pin) of the pallet receiving surface 41 is fitted into the pin hole 34 of the work transport pallet 3. After the work transport pallet 3 is mounted on the pallet receiving surface 41, the first and second fixed arms 81A and 81B positioned at the retracted positions A1 and B1 are pushed in the directions of the fixed positions A3 and B3, respectively.

  When the first and second fixed arms 81A and 81B are pushed until they exceed the turning intermediate positions A2 and B2, the urging forces of the first and second tension coil springs 82A and 82B are reversed in the first and second fixed arms. Acts on 81A and 81B. As a result, the first and second fixed arms 81 </ b> A and 81 </ b> B are turned to the respective fixed positions A <b> 3 and B <b> 3 by the spring force, and the convex curved surfaces 84 </ b> A and 84 </ b> B are pressed against the surface 3 a of the workpiece conveyance pallet 3.

  Thereby, as shown in FIG. 5, a state in which the workpiece conveyance pallet 3 is fixed to the pallet receiving surface 41 is formed. The work conveyance pallet 3 is held in close contact with the pallet receiving surface 41. The pallet receiving surface 41 is a plane orthogonal to the central axis 42a. As shown in FIG. 2, the center axis line 42 a is set to coincide with the center axis line of the work holding unit 101 of the lens processing apparatus 100. Therefore, the lens 2 can be reliably delivered between the workpiece holding unit 101 and each workpiece placement unit 31 of the workpiece conveyance pallet 3.

  When removing the workpiece conveyance pallet 3 from the pallet receiving surface 41, the workpiece conveyance pallet 3 is pulled up in a direction perpendicular to the pallet receiving surface 41 in the state shown in FIG. The first and second fixing arms 81 </ b> A and 81 </ b> B of the pallet fixing mechanism 8 are pushed up by their work conveying pallets 3.

  The convex curved surfaces 84A and 84B of the first and second fixed arms 81A and 81B pass through the center of the workpiece transfer pallet 3 until the first and second fixed arms 81A and 81B are swung to a position exceeding the turning midway positions A2 and B2. The outer peripheral edge portion of the hole 33 is engaged. In other words, the lengths of the first and second fixed arms 81A and 81B are appropriately set so that the engaged state can be maintained.

  Further, the first and second fixed arms 81 </ b> A and 81 </ b> B are pushed while their convex curved surfaces 84 </ b> A and 84 </ b> B slide smoothly along the surface 3 a of the work conveyance pallet 3. Therefore, the first and second fixed arms 81A and 81B can be pushed up without a large sliding resistance.

  When the first and second fixed arms 81A and 81B exceed the midway turning positions A2 and B2, the first and second fixed arms 81A and 81B are reversely directed by the spring force of the first and second tension coil springs 82A and 82B. The turning force of As a result, the first and second fixed arms 81A and 81B automatically return to the state shown in FIG.

  Even when the mounting direction of the work transport pallet 3 is reversed upside down, the work pallet 3 can be mounted, fixed, and released using the same pallet fixing mechanism 8. In the above example, a pair of fixed arms 81A and 81B are used, but it is also possible to use three or more fixed arms arranged at equal angular intervals. It may be possible to use a single fixed arm.

DESCRIPTION OF SYMBOLS 1 Work conveyance apparatus 2 Lens 3 Work conveyance pallet 3a Surface 4 Work attachment / detachment part 5 Work indexing mechanism 6 Work feed mechanism 7 Controller 8 Pallet fixing mechanism 31 Work mounting part 32 Work tray 33 Center through hole 34 Pin hole 41 Pallet receiving surface 42 Pallet rest 42a Center axis 43 Positioning part (positioning pin)
44 Protruding portion 44a Tip portion 45 Receiving side spring hook 51 Feeding base 52 Indexing motor 53 Transmission portion 61 Supporting frame 62 Drive portion 81A First fixed arm 81B Second fixed arm 82A First tension coil spring 82B Second tension coil spring 83A First One arm support shaft 83B Second arm support shaft 84A Convex curved surface 84B Convex curved surface 85A Pallet side spring hook 85B Pallet side spring hook 100 Lens processing device 101 Work holding part A1, B1 Retraction position A2, B2 Turning midway position A3, B3 Fixed position

Claims (5)

A workpiece transfer pallet (3) provided with a plurality of workpiece placement units (31) arranged on the same circle;
A pallet stand (42) having a pallet receiving surface (41) on which the workpiece transfer pallet (3) is placed;
A positioning portion (43) for positioning the workpiece transfer pallet (3) with respect to the pallet receiving surface (41);
A pallet fixing mechanism (8) for fixing the workpiece transfer pallet (3) to the pallet receiving surface (41);
Have
The pallet fixing mechanism (8) includes a fixing arm (81A) for fixing the work conveying pallet (3) to the pallet receiving surface (41), and an urging member for urging the fixing arm (81A). 82A), and
The fixed arm (81A) can pivot between a pallet fixing position (A3) and a retracted position (A1), and the pallet fixing position (A3) can be rotated by the fixed arm (81A). (3) is a position where the pallet receiving surface (41) is pressed against and fixed to the pallet receiving surface (41). The retracted position (A1) is the position where the fixed arm (81A) is the workpiece. A position that does not interfere with the workpiece conveyance pallet (3) that is separated from the conveyance pallet (3) and is attached to and detached from the pallet receiving surface (41) from a predetermined direction,
While the urging member (82A) is turned to the turning middle position (A2) in the middle of the fixed arm (81A) from the fixed position (A3) to the retracted position (A1), the urging member (81A) ) Is applied to the fixed position (A3) in a turning direction, and the fixed arm (81A) is turned from the retracted position (A1) to the turning intermediate position (A2). A biasing force in a direction of turning to the retracted position (A1) is applied to (81A),
The fixed arm (81A) in the fixed position (A3) is swung to a position exceeding the midway swivel position (A2) by the work transport pallet (3) removed from the pallet receiving surface (41). A workpiece transfer device (1) characterized by the above. A central through hole (33) formed in the central portion of the workpiece transfer pallet (3);
A projecting portion (44) projecting perpendicularly to the pallet receiving surface (41) from the center portion of the pallet receiving surface (41) and penetrating the center through hole (33) of the work conveying pallet (3). When,
Have
The protruding portion (44) includes a tip end portion (44a) protruding from the central through hole (33) of the work conveying pallet (3) placed on the pallet receiving surface (41),
As the fixed arm, provided with a first fixed arm (81A) and a second fixed arm (81B) that are attached to the tip portion (44a) in a pivotable state,
The first fixed arm (81A) can pivot between a first fixed position (A3) which is the fixed position and a first retracted position (A1) which is the retracted position;
The second fixed arm (81B) can pivot between a second fixed position (B3) as the fixed position and a second retracted position (B1) as the retracted position,
As the biasing member, a first biasing member (82A) that biases the first fixed arm (81A) and a second biasing member (82B) that biases the second fixed arm (81B). Prepared,
The first fixed arm (81A) and the first urging member (82A), and the second fixed arm (81B) and the second urging member (82B) are the center of the pallet rest (42). It is arranged in a point-symmetric state with respect to the axis (42a),
When viewed from a direction perpendicular to the pallet receiving surface (41), the first and second fixed arms (81A, 81B) at the retracted positions (A1, B1) are in the central through hole (33). The workpiece transfer apparatus (1) according to claim 1, which is located. A first pivot support shaft (83A) and a second pivot support shaft (83B) attached in a state of point symmetry with respect to the central axis (42a) are provided at the tip end portion (44a) of the protrusion (44). And
The first fixed arm (81A) is supported by the first turning support shaft (83A),
The second fixed arm (81B) is supported by the second turning spindle (83B),
The first biasing member (82A) includes a cradle-side spring hook (45) attached to the tip portion (44a) and a first fixed arm-side spring attached to the tip portion of the first fixed arm (81A). A first tension coil spring spanned in a tension state between the hook (85A),
The second urging member (82B) is between the cradle-side spring hook (45) and the second fixed arm-side spring hook (85B) attached to the tip of the second fixed arm (81B). The workpiece conveying device (1) according to claim 2, wherein the workpiece conveying device (1) is a second tension coil spring suspended in a tension state.   On the tip portions of the first fixed arm (81A) and the second fixed arm (81B), pressing surfaces (84A, 84B) having convex arcuate contours for pressing the workpiece transfer pallet (3) are provided. The work transfer device (1) according to claim 2 or 3, wherein the work transfer device (1) is formed. Each workpiece placement portion (31) of the workpiece conveying pallet (3) fixed to the pallet receiving surface (41) by rotating the pallet receiving table (42) around the central axis (42a) is the same as the above. A workpiece indexing mechanism (5) for positioning at a predetermined angular position on the circle;
A workpiece feed mechanism (6) for moving the pallet cradle (42) in a direction perpendicular to the central axis (42a);
The workpiece transfer apparatus (1) according to any one of claims 1 to 4, further comprising:

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