JP2000210822A - Work positioning method and device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the structure of a device for positioning a work on a work reference position and to improve the positioning accuracy by conveying a work engaged with a pallet, and positioning the same on its work reference position while keeping the engagement state when the work reachs a working zone. SOLUTION: A pallet receiver 3 for receiving a pallet 2 with a work 1 is mounted on a predetermined position in the work flow direction of a manufacturing line, and a transfer bar 10a for conveying the pallet 2 is mounted on a transfer machine 10. The pallet 2 is provided with two engagement pins 21 to be engaged with the work 1 and three support fittings 23 for supporting the work 1. Whereby the work 1 is displaceably supported by the engagement pins 21 and the engagement holes 22 while supported by the support fittings 23. A main body frame 31 of a positioning device 11 comprises a work holding mechanism 14 and a positioning mechanism 15, so that the pallet 2 with the work 1, is positioned on the work reference position by the actuation of these mechanisms.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for positioning a work at an operation reference position on a production line.
In particular, it relates to simplification of the device configuration and improvement of positioning accuracy.

[0002]

2. Description of the Related Art Conventionally, in a manufacturing line for performing work such as processing on a work, generally, the work is performed after positioning the work at a work reference position at each processing station. There are various methods for positioning the work. For example, as disclosed in JP-A-9-285934, the work is positioned when the work is transferred from the transfer position on the production line to the work reference position. There is something.

Further, as described in Japanese Patent Application Laid-Open No. Hei 6-33629, there is a type in which a work is positioned for each pallet on a conveyor that carries the work placed on the pallet. In this configuration, a pallet having holes is used. When the work is processed, the chuck holding the work from below through the hole is raised to a predetermined position, the work is lifted from the pallet, and the work is positioned at that position.

[0004]

However, the former configuration requires a mechanism for transferring the work from the transfer position to the work reference position, and has a problem that the configuration of the apparatus becomes complicated. In the latter configuration, since the work is lifted from the pallet, chips may be accumulated on the pallet during processing, and as a result, the position of the work when the work is lowered onto the pallet after processing is reduced. There is a possibility that the positioning accuracy of the work at the next processing station may be affected, which is not constant.

The present invention has been made in view of the above problems, and has as its object to simplify an apparatus configuration for positioning a work at a work reference position on a production line, and at the same time, It is to improve the positioning accuracy.

[0006]

According to the present invention, a work is conveyed while being engaged with a pallet, and when the work reaches a work area, the work is positioned at a work reference position while maintaining the engaged state. It was done.

More specifically, a first solution taken by the present invention is based on a positioning method for positioning a work placed on a pallet at a work reference position in a work area of a work machine installed on a production line. I have. Then, while the work is conveyed to the pallet while being engaged with the pallet so that the position can be changed within a predetermined range, when the work is conveyed to the work area, the work is maintained while maintaining the engagement state between the work and the pallet. Is positioned at the work reference position. The work reference position means a position where the work 10 is positioned for work such as processing, and the work area means a region having a certain extent including the work reference position.

[0008] A second solution taken by the present invention is:
In the first aspect, when the work is conveyed to the work area, the pallet is moved to a predetermined position, and then the work is positioned at the work reference position by the positioning means. The movable range of the work with respect to the pallet is included in a positionable area where the positioning means can act on the work.

Further, a third solution taken by the present invention is:
In the second solution, the work is held and temporarily positioned after the pallet is moved to a predetermined position, and the work is positioned at the work reference position after the temporary positioning.

[0010] A fourth solution taken by the present invention is:
In the third solution, the holding force for temporary positioning of the work is set so as to allow movement of the work to a work reference position by a positioning operation on the work.

Further, a fifth solution taken by the present invention is:
It is premised on a positioning device for positioning a work placed on a pallet at a work reference position when the work is transferred to a work area on a production line by a transfer means. An engaging means, which is provided on the pallet so as to engage with the work, holds the work on the pallet so as to be changeable within a predetermined range, and engages the work conveyed to the work area by the conveying means. Positioning means for positioning the work reference position while maintaining the engagement with the means.

Further, a sixth solution taken by the present invention is:
The fifth solution means, further comprising a pallet moving means for moving the pallet to a predetermined position when the work is conveyed to the work area, wherein the movable range of the work with respect to the pallet at the predetermined position is such that the positioning means can act on the work. It is intended to be included in a simple positionable area.

[0013] A seventh solution taken by the present invention is:
The sixth aspect of the present invention is the sixth aspect of the invention, further comprising a work holding means for holding the work on the pallet moved to a predetermined position and temporarily positioning the work in the positionable area of the positioning means.

An eighth solution taken by the present invention is:
In the seventh aspect, the engaging means includes an engaging pin provided on the pallet so as to engage with an engaging hole formed in the work to allow a position change of the work within a predetermined range. As a positioning means, a positioning means main body fixedly installed and a positioning pin provided on the positioning means main body so as to fit into a positioning hole formed in the work and position the work at a work reference position are provided. It is.

[0015] A ninth solution taken by the present invention is:
In the above-mentioned eighth solution, the engaging pin and the positioning pin are constituted by tapered pins formed with a small diameter toward the distal end, and the engaging pin is configured to be loosely fitted into an engaging hole of a work. It is.

According to a tenth aspect of the present invention, in any one of the fifth to ninth aspects,
The transfer means is constituted by a transfer machine.

-Operation- In the first and fifth solving means, the work is conveyed while being engaged with the pallet, so that the work is prevented from falling off the pallet during the conveyance. If the work is transported to the work area in this state, the variation in the position of the work is within the range in which the position with respect to the pallet can be changed, and the work is positioned from that position to the work reference position.

In the second and sixth solving means,
After the work reaches the work area, an operation of moving the pallet to a predetermined position is performed. For this reason, the position of the pallet is fixed when positioning the work. Also,
At this time, the work is always positioned within the positionable area of the positioning means, and is positioned from that position to the work reference position.

In the third and seventh solving means,
After moving the pallet to a predetermined position, the work is first provisionally positioned, and from that position to the work reference position.

In the fourth solution, the position of the work is temporarily held by the temporary positioning, but when the positioning means acts on the work, the work moves from the holding position by the temporary positioning to the work reference position. Is positioned.

In the eighth solution, the work is held on the pallet by engaging the engaging pin with the engaging hole, and in the working area, the positioning pin is fitted into the positioning hole. It is positioned at the work reference position.

In the ninth solving means, the engaging pin and the positioning pin are inserted into the engaging hole and the positioning hole from the smaller diameter end. Also, by allowing the engagement pin to be loosely fitted in the engagement hole,
The position can be changed within the range of the gap.

[0023]

According to the above first and fifth means,
Since the work is positioned at the work reference position while being engaged with the pallet, there is no need to transfer the work from the transfer position to the work reference position, and the apparatus configuration can be simplified. Also, since the work is not lifted from the pallet,
Chips do not accumulate on the pallet during processing, and the positioning accuracy of the work can be increased.

In the second and sixth solving means, the work is positioned after the pallet is moved to a predetermined position. In the third and seventh solving means, the pallet is moved to a predetermined position. After the movement, the workpiece is provisionally positioned and then positioned, so that the positioning can be performed more accurately.

According to the fourth solution, the work can be easily and reliably moved from the position held by the temporary positioning to the work reference position.

Further, according to the eighth and ninth means, since the engaging means uses the engaging pin and the positioning means uses the positioning pin, the structure of the apparatus can be simplified.

According to the tenth solution means, a transfer machine is used as a transport means, and the transfer machine is less likely to cause problems than a conveyor even if chips are applied thereto. It is suitable as a transport means of a manufacturing line to which the present invention is applied.

[0028]

Embodiment 1 Hereinafter, Embodiment 1 of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a front view showing a schematic configuration of the positioning device according to the first embodiment, FIG. 2 is a left side view of FIG. 1, and FIG.
FIG. 2 is a diagram showing a state where the positioning device of FIG.

In the drawing, reference numeral 10 denotes a slide carry type transfer machine which is a means for transporting a work 1,
Reference numeral 1 denotes a positioning device that positions the work 1 at a work reference position when the work 1 is transported to a work area on a production line, and 12 denotes a processing device that processes the work 1 at the work reference position. ing.

In the production line, a pallet receiver 3 for receiving a pallet 2 on which a work 1 is placed is provided at a predetermined position in the flow direction of the work 1. On the other hand, transfer machine 1
0 has a transfer bar 10a for transporting the pallet 2 on which the work 1 is placed. It should be noted that, with regard to the transfer machine 10, the mechanical parts other than the transfer bar 10a are not shown.

When the work 1 is not transported, the transfer bar 10a stands by at a lowered position (the position shown in FIG. 2) lower than the lower surface of the pallet 2 placed on the pallet receiver 3, and when the work 1 is transported, the transfer bar 10a moves from the lowered position. When the pallet 2 is lifted, the pallet 2 is advanced, and the pallet 2 is advanced again in the feed direction of the work 1 and is lowered again.
It is configured to be put on again. The pallet 2 advances on the production line by repeating the movement of the transfer bar 10a.

An engaging pin 21 is provided upright on the pallet 2 as an engaging means for engaging with the work 1. As shown in detail in FIG. 4, the engagement pin 21 is
2 is formed to be smaller in diameter than the engaging hole 22 so as to be loosely fitted. Therefore, in a state where the engaging pin 21 is engaged with the engaging hole 22, the work 1 is
The position can be changed within a predetermined range determined by the gap 2. The engaging pin 21 is formed as a tapered pin that becomes thinner toward the distal end, and is configured such that the tapered portion 21a at the distal end serves as a guide when the work 1 is placed on the pallet 2.

The engaging pins 21 are provided at two places on the pallet 2. The pallet 2 has a work 1
Are provided at three places. The position of the work 1 can be changed within the above-described predetermined range by the engagement pin 21 and the engagement hole 22 in a state where the work 1 is supported at three points by the support fitting 23.

Reference numeral 13 denotes a pallet pull-in mechanism (pallet moving means) for moving the pallet 2 to a predetermined position when the work 1 is transported to the work area. The pallet retraction mechanism 13 includes an air cylinder 31 fixed to the main body frame 41 of the positioning device 11, a retraction plate 33 fixed to a rod 32 of the air cylinder 31, and a guide rod 34 for preventing the retraction plate 33 from rotating. And

As shown in detail in FIG. 5, the retracting plate 33 is formed to have a thickness smaller than the width of the groove 35 so as to enter the groove 35 formed on the lower surface of the pallet 2.
When the pallet 2 is transported to the work area of the work 1, the retraction mechanism 13 is configured to retract the pallet 2 to a predetermined position on the main body frame 41 side of the positioning device 1.

The positioning device 11 is provided with
1, a work holding mechanism (work holding means) 14, and a positioning mechanism (positioning means) 15. When the work 1 is transported to the work area by the transfer bar 10a, the positioning mechanism 15 positions the work 1 at the work reference position while maintaining the work 1 engaged with the engagement pin 21. It is configured.

The main body frame 41 is fixedly installed beside the transfer machine 10 at a predetermined processing station, and the work holding mechanism 14 is provided above the main body frame 41. The work holding mechanism 14 includes an air cylinder 42 mounted on an upper surface of a main body frame 41 and a lever 4 connected to a rod 43 of the air cylinder 42.
4 and a stay 45 for swingably supporting the lever 44. And the rod 4 of the air cylinder 42
3 is retracted, the lever 44 is tilted to the imaginary line work release position, and the lever 4 is pushed out of the rod 43.
4 is configured to be a work holding position indicated by a solid line.

The main body frame 41 of the positioning device 11 is provided with a metal fitting 46 with which the reference surface A of the work 1 abuts. The contact fittings 46 are arranged at three places, and the direction of the reference surface A of the work 1 is made constant by bringing the reference surface A of the work 1 into contact with the contact fittings 46. When the work holding mechanism 14 is operated to bring the reference surface of the work into contact with the metal fitting, the work 1
Is provisionally positioned within the positionable area by the positioning mechanism 15, and the position is maintained.

The main body frame 41 is provided with the processing machine 12.
Notch holes 41a are formed in order to process the work 1 by advancing the work heads 12a and 12b toward the work 1.

The positioning mechanism 15 includes a positioning pin 47 projecting from the main body frame 41 toward the work 1, and the positioning pin 47 is configured to be able to advance and retreat in the axial direction. An air cylinder 48 is used as an actuator for moving the positioning pin 47 forward and backward. As shown in FIG. 6, the positioning pin 47 is lower than the reference plane A of the work 1 held by the work holding mechanism 14 in a state of being in contact with the fitting 46 at the retracted position.
In the advanced position, the work 1 is configured to fit into a positioning hole 49 formed in the work 1. This positioning pin 47
Is a tapered pin formed with a smaller diameter toward the distal end side, and the tapered portion 47 a is configured as a guide surface when fitting into the positioning hole 49.

In the first embodiment, the movable range and the work reference position are set so that the movable range of the work 1 with respect to the pallet 2 when the work 1 is transported to the work area includes the work reference position of the work 1. Is set. More specifically, when the work 1 arrives at the work area, the work 1 with respect to the pallet 2 in a state where the pallet 2 is pulled into a predetermined position on the main body frame 41 side by the pallet retraction mechanism 13.
Are set so that the work reference position of the work 1 is included in the movable range of the work 1.

-Operation- Next, the operation of each device and mechanism will be described.

The work 1 is conveyed on the production line by the transfer machine 10 while being placed on the pallet 2 and once stopped when reaching the work area of each processing station. When the work 1 is transported, the work 1 is engaged with the engagement pins 21 of the pallet 2. Even if the work 1 is displaced during the transfer, the displacement can be changed in the engaged state. Within a reasonable range. Further, in a state where the work has just entered the work area, the reference surface A is not in contact with the contact fitting 46.

During the transfer of the work 1, the pull-in mechanism 1
The third air cylinder 31 is set in a state where the rod 32 is advanced, the air cylinder 42 of the work holding mechanism 14 is set in a state where the rod 43 is retracted, and the positioning pin 47 is set in a state where it is retracted by the air cylinder 48. ing.

When the work 1 is transported to the work area, the pallet draw-in plate 33 is in a state of being inserted into the groove 35 of the pallet 2 as shown by a solid line in FIG. Then, in this state, the pallet retraction mechanism 13 operates, and the pallet 2 is retracted to a predetermined position on the main body frame 41 side of the positioning device 11. Specifically, when the pallet 2 is moved to the left in FIG. 5 from the state in which the pallet 2 is conveyed onto the retracting plate 33, the retracting plate 33 pushes the left end surface 35a of the groove 35 to remove the pallet. Move. In FIG. 5, the solid line shows the position before the movement, and the virtual line shows the position after the movement.

Next, air is supplied to the air cylinder 42 of the work holding mechanism 14, and the work 1 is drawn into the main body frame 41 by the lever 44, and the reference surface A of the work 1 is brought into contact with the fitting 46. And the air cylinder 42
The supply of air to the work piece 1 is temporarily stopped, and the pressing of the work 1 against the contact fitting 46 is released while the position of the lever 44 is maintained. As a result, the workpiece 1 is in a temporary positioning state where the workpiece 1 is held at a position where the reference surface A is in contact with the metal fitting 46. At this time, the engaged state of the work 1 and the engagement pin 21 is maintained.

After the work 1 is provisionally positioned in this way, the work 1 is then positioned at the work reference position. Also at this time, the engaged state of the work 1 and the engagement pin 21 is maintained. The positioning of the work 1 is performed by operating the air cylinder 48 to advance the positioning pin 47 and fitting the positioning pin 47 into the positioning hole 49 of the work 1. At this time, since the pressing force of the work 1 against the contact fitting 46 has been released, the work 1 is
Is positioned while slightly moving in the direction along the reference plane A when entering the positioning hole 49. When the two positioning pins 47 have been fitted into the positioning holes 49, the work 1 is positioned.

When the positioning of the work 1 is completed, air is again supplied to the air cylinder 42 of the work holding mechanism 14 to press the work 1 against the fitting 46. Thus, even if the work 1 is slightly moved by inserting the positioning pin 47 into the positioning hole 49 in a state where the pressing force of the work 1 against the fitting 46 is released, the work 1 is accurately positioned. Can be fixed. Then, with the work 1 fixed in this manner, the processing device 12
Are moved to the work 1 side,
Work 1 is processed. At this time, since the work 1 is accurately positioned, the work can be processed accurately.

According to the first embodiment, the work 1 is positioned at the work reference position while being engaged with the pallet 2, and the work 1 is not transferred from the transport position to the work reference position. With the configuration, the device configuration can be simplified. Further, in particular, the configuration of the apparatus is such that the engaging pin 21 that fits loosely into the engaging hole 22 of the work 1 is used as the engaging means, and the positioning pin 47 that fits into the positioning hole 49 of the work is used as the positioning means. Can be simplified.

Further, since the work 1 is not lifted from the pallet 2, chips may be generated during processing.
Therefore, the positioning accuracy of the work 1 can be increased without accumulating on the pallet 2 from a gap between the work 1 and the pallet 2. Further, since the pallet 2 is moved to a predetermined position by the pull-in mechanism 13, it is temporarily positioned by the work holding mechanism 14, and is further positioned by using the positioning mechanism 15, so that positioning can be performed easily and accurately. it can.

[0052]

Second Embodiment A second embodiment of the present invention, as shown in FIGS. 7 to 9, is an example in which the positioning mechanism 15 is constituted by positioning pins 47 that move in the vertical direction. Note that, as in the first embodiment, a transfer machine having a transfer bar 10a is used as the transport unit 10.
Further, although the processing apparatus is not shown in the drawings, the first embodiment
The same device as described above and other devices can be appropriately adopted.

As in the first embodiment, a pallet receiver 3 for receiving a pallet 2 on which a work 1 is placed is provided at a predetermined position in the flow direction of the work 1 on the production line, and the transfer machine 10 is controlled by a transfer bar 10a by a transfer bar 10a. 2 are sequentially transmitted. Also, pallet 2
As in the first embodiment, an engagement pin 21 that engages with an engagement hole 22 (see FIG. 4) of the work 1 and a support fitting 23 that supports the work 1 at three points are provided in the first embodiment. Engagement pin 2
Reference numeral 1 denotes a tapered pin that is loosely fitted in the engagement hole 22 of the work 1 and is provided at two locations.

The main body frame of the positioning device 11 is
1b and a top plate 41c. The work holding mechanism 14 is mounted on the top plate 41c, and the work positioning mechanism 15 is mounted on the support 41b. Work holding mechanism 1
4 is an air cylinder 52 fixed to the top plate 41c via a stand 51, and a rod 53 of the air cylinder 52.
An elevating frame 54 fixed to the end of the frame, a pressing rod 55 having an upper end fixed to the elevating frame 54, and a guide mechanism 56 for guiding the elevating and lowering of the pressing rod 55 are provided. The guide mechanism 56 incorporates a guide member such as a linear motion bearing or a bush.
5 makes it possible to move up and down smoothly. At the lower end of the holding rod 55, a holding end 58 that comes into contact with the flange 57 of the work 1 by lowering the holding rod 55 is provided.

On the other hand, as shown in FIG. 9, the positioning mechanism 15
1 is attached. The positioning mechanism 15 includes an air cylinder 62 fixed to a bracket 61 and a positioning rod 65 connected to a rod 63 of the air cylinder 62 via a connection plate 64. The positioning rod 65 is fitted with a guide bush 66 provided on the bracket 61, and a positioning pin 67 that fits into the positioning hole 49 of the work 1 is formed at an upper end thereof.

The positioning rod 65 normally waits at a lowered position where the upper end of the positioning pin 67 is lower than the lower surface of the pallet 2. Then, when positioning the work 1, it rises and penetrates the pallet 2, and the positioning pin 67 at the tip fits into the positioning hole 49 of the work 1. The pallet 2 is provided with a guide bush through which the ascending positioning rod 65 is inserted. The pallet 2 is also positioned when the locating rod 65 is raised.

-Operation- In the second embodiment, when the work 1 is transported, the holding rod 5
The positions of the respective air cylinders 52 and 62 are set such that the position 5 rises and the positioning rod 65 moves down. When the work 1 is transported to the processing area, first,
Air is supplied to the air cylinder 52 of the work holding mechanism 14, and the holding rod 55 descends to press the work 1 against the support fitting 23.

Next, the supply of air to the air cylinder 52 is temporarily stopped, and the holding end 58 at the lower end of the holding rod 55 is kept in contact with the flange 57 of the work 1 while maintaining the state of contact with the support fitting 23. Release the pressing force of the work 1. Then, air is supplied to the air cylinder 62 of the positioning mechanism 15, and the positioning rod 65 is raised. At this time, the positioning rod 65 first positions the pallet 2 when passing through the guide bush 68 of the pallet 2, and then the positioning pins 67 are fitted into the positioning holes 49 of the work 1 to position the work 1. At this time, since no pressing force is applied to the work 1 from the holding rod 55, the position of the work 1 is easily adjusted within the movable range with respect to the engagement pin 21, and positioning is performed.

When the work 1 is positioned in this manner, air is again supplied to the air cylinder 52 of the work holding mechanism 14, and the work 1 is pressed against the support fitting 23 again to be fixed. Then, while the work 1 is kept fixed, a processing device (not shown) is operated to process the work 1.

-Effects of Second Embodiment- According to the second embodiment, similarly to the first embodiment, the work 1
Is positioned at the work reference position while being engaged with the pallet 2 and is not transferred from the transport position to the work reference position. In addition, the engagement pin 21 is used as the engagement means, and the positioning pin 47 is used as the positioning means. In addition, the device configuration can be simplified. In addition, since the work 1 is not lifted from the pallet 2, chips do not accumulate on the pallet 2 from a gap with the work 1 during processing, and the positioning accuracy of the work 1 can be improved.

Further, in the second embodiment, since the entire circumference of the side surface of the work 1 is opened, the degree of freedom in processing the work 1 can be increased.

[0062]

Other Embodiments of the Invention The present invention may be configured as follows with respect to the above embodiment.

For example, in the first embodiment, the engagement pin 2
The work 1 is configured to be loosely fitted into the engagement hole 22 of the work 1 so that the position of the work 1 is changed within a predetermined range with respect to the pallet 2.
1 may be configured to fit into the engagement hole 22 and change its position within a predetermined range. That is, the engagement pin 2
Instead of the configuration in which the workpiece 1 moves with respect to the workpiece 1, a configuration in which the engagement pin 21 moves together with the workpiece 1 is also possible.

The transfer machine 10 used in each of the above embodiments is less likely to cause problems than a conveyor even when chips are spilled thereon. The transfer means is not limited to the transfer machine 10, and may be changed as appropriate, for example, using a conveyor in a line for assembling parts.

[Brief description of the drawings]

FIG. 1 is a front view of a positioning device according to a first embodiment of the present invention.

FIG. 2 is a left side view of the positioning device of FIG.

FIG. 3 is a view showing a state where the positioning device of FIG. 1 is installed at a predetermined processing station of a production line.

FIG. 4 is a partially enlarged sectional view showing an engagement state between a work and a pallet.

FIG. 5 is a partially enlarged cross-sectional view showing an engagement state between a draw-in plate and a pallet.

FIG. 6 is an enlarged partial cross-sectional view showing an engagement state between a positioning pin and a work.

FIG. 7 is a front view of a positioning device according to a second embodiment of the present invention.

FIG. 8 is a left side view of the positioning device of FIG. 7;

FIG. 9 is a partially enlarged sectional view showing a positioning mechanism.

[Explanation of symbols]

 Reference Signs List 1 work 2 pallet 10 transfer machine (transporting means) 12 work machine 13 pallet pull-in mechanism (pallet moving means) 14 work holding mechanism (work holding means) 15 positioning mechanism (positioning means) 21 engaging pin (engaging means) 22 Mating hole 41 Body frame (positioning means body) 47 Positioning pin 49 Positioning hole

Claims (10)

[Claims] 1. A positioning method for positioning a work placed on a pallet at a work reference position in a work area of a working machine installed on a production line, wherein the position of the work can be changed within a predetermined range with respect to the pallet. When the workpiece is transported to the work area while the workpiece is transported to the work area, the workpiece is positioned at the work reference position while maintaining the engagement state between the workpiece and the pallet. Positioning method. 2. When the work is transported to a work area, the work is moved to a predetermined position, and then the work is positioned at a work reference position by positioning means. The movable range is
2. The method for positioning a work according to claim 1, wherein the work is positioned in a positionable area where the positioning means can act on the work. 3. The method according to claim 2, wherein after the pallet is moved to a predetermined position, the work is held and provisionally positioned, and after the provisional positioning, the work is positioned at a work reference position. . 4. The work positioning method according to claim 3, wherein the holding force for temporary positioning of the work is set so as to allow movement of the work to the work reference position by a positioning operation on the work. 5. When a work placed on a pallet is transferred to a work area on a production line by a transfer means,
A positioning device for positioning the work at a work reference position, provided on the pallet so as to be engaged with the work, and an engaging means for holding the work on the pallet so as to be changeable within a predetermined range; The work conveyed to the work area by the conveyance means,
A positioning device for positioning the workpiece at a work reference position while maintaining a state of engagement with the engagement device. 6. A pallet moving means for moving a pallet to a predetermined position when the work is transported to the work area, wherein the movable range of the work with respect to the pallet at the predetermined position is:
6. The work positioning device according to claim 5, wherein the work positioning means is included in a positionable area where the positioning means can operate. 7. The work positioning apparatus according to claim 6, further comprising work holding means for holding the work on the pallet moved to a predetermined position and temporarily positioning the work in a positionable area of the positioning means. 8. The engaging means includes an engaging pin provided on a pallet so as to engage with an engaging hole formed in the work and to allow a position change of the work within a predetermined range. The means is a positioning means body fixedly installed,
8. The work positioning apparatus according to claim 7, further comprising a positioning pin provided on a positioning means main body so as to fit into a positioning hole formed in the work and position the work at a work reference position. 9. The engagement pin and the positioning pin are tapered pins each having a smaller diameter toward the distal end, and the engagement pin is configured to be loosely fitted into an engagement hole of the work. 8. The apparatus for positioning a work according to claim 8. 10. The work positioning apparatus according to claim 5, wherein the transfer means is a transfer machine.