JP2019018291A - Pallet transfer device for conveying workpiece - Google Patents

Abstract

To provide a high-durability pallet transfer device for conveying workpieces capable of surely transferring the pallet for conveying workpieces without attaching a special tool to a chain.SOLUTION: A pallet transfer device is equipped with pallets 1, a guide rail 2 regulating the transfer track thereof and an endless chain module 3 constructed parallel to the rail. The pallet 1 is equipped with a connection pin 8 inserted between the adjacent joint pins of the endless chain module 3. The endless chain module 3 comprises: an endless chain; a pair of base sprockets 4 establishing the support side of the chain; a pair of girdlelike sprockets 5 disposed inside the base sprockets 4 and drawing up the lower side of the chain from the lower end of the adjacent base sprocket 4; and the brattish sprockets 6 disposed inside the girdlelike sprockets 5 pressing the chain to the lower side thereof from inside.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a pallet transfer device for workpiece transfer in a processing manufacturing factory or the like that has been automated.

  In a pallet transfer device that transfers workpieces before and after processing in a processing and manufacturing factory where automation has been advanced, a structure that shifts the transfer path in parallel in the horizontal direction (see, for example, Patent Document 1 below), the transfer path is run in parallel. Structure (for example, see Patent Document 2 below), structure for changing the pallet transfer interval, structure for expanding and contracting the pallet transfer path (for example, see Patent Document 3 below), and structure having a plurality of stations (for example, see Patent Document 4 below) ), Various devices are introduced by combining a structure for turning the transfer path (for example, see Patent Document 5 below) and a structure for moving the transfer path up and down (for example, see Patent Document 6 below), and a pallet for transferring workpieces according to each is also introduced. It is also provided.

In the first place, conventionally, a metal chain (hereinafter referred to as “chain”) is generally used as a power transmission element of the pallet transfer device.
As the value of goods transferred using such a device increases, the demand for higher accuracy, higher speed, and cleaning of the pallet transfer device becomes stronger, elongation due to initial wear, noise during operation, Problems such as contamination of products due to lubricating oil became apparent.

Therefore, a toothed belt (hereinafter referred to as “timing belt”) made of a tough resin in which initial elongation and secular elongation are suppressed has been developed.
The timing belt is not only advantageous in terms of high accuracy, but also has an overwhelmingly small mass and low inertia, which is advantageous for high-speed operation, and is also advantageous in terms of quietness and cleanliness.

JP 2011-093032 A JP 2011-110651 A JP 2011-189420 A JP 2011-189999 A Japanese Patent Laid-Open No. 2006-117117 Japanese Patent Laid-Open No. 2006-150391

However, the power transmission element for transferring the pallet on which the workpiece is mounted needs to smoothly connect and disconnect the pallet and the power transmission element, and it is difficult to satisfy such a request with the timing belt itself. is there.
Thus, although a connecting jig is attached to the timing belt, it is difficult to form the timing belt itself into a shape having such a function.
Further, in order to provide such a function, performing processing such as drilling on the timing belt is disadvantageous in terms of strength and position accuracy, and the original advantage of the timing belt is lost.

  On the other hand, no matter how strong the timing belt is made of resin, the wear of the resin due to interference with other hard parts and the accompanying escape of the fiber are unavoidable, and fiber waste and resin dust are generated in the work space. There is a problem that it interferes with precision work and product quality maintenance.

  In recent years, due to improvements in the structure of chains and the evolution of metal materials, the chain with initial wear has been reduced to about 0.03%, and a chain with little aging has been supplied. Although it has been reviewed, even with such a chain, if some kind of jig is attached to the chain component, there will be a problem that the original movement of the chain will be hindered, and the improvement and evolution of the chain will be reduced. It will be.

Therefore, if the chain is used as it is and the gap between the paired links is used for pallet transfer, the sprocket teeth that drive the chain will block the gap and hinder the movement of the pallet, and extend the transfer path. It becomes an obstacle when doing.
On the other hand, if the sprocket teeth are short, there is a problem that the chain cannot be reliably fed and loosening or slipping occurs.

Depending on the process and lot content required for the work mounted on the pallet, it may be necessary to change the pallet transfer interval several times.
For example, in processes that require a relatively large work area, such as complicated processing and assembly, it is necessary to increase the pallet transfer interval, while in the inspection process after assembly, work that is narrow enough to install an image processing device camera, etc. If the area is sufficient, the pallet transfer interval may be reduced.

  The present invention has been made in view of the above circumstances, and has durability, stability, accuracy, and expandability capable of accurately transferring a pallet for conveying a workpiece without attaching a special jig to a power transmission element. An object of the present invention is to provide a pallet transfer device for conveying workpieces having a high height.

  In order to solve the above-mentioned problems, a pallet transfer device for transferring a workpiece according to the present invention includes a pallet on which a workpiece is detachably mounted, a guide rail that is held by the pallet and serves as a transfer track for the pallet, and the pallet is attached to and detached from the pallet. An endless chain module that is freely connected and is laid in parallel with the guide rail is provided.

  The pallet includes a connection pin that is inserted between adjacent joint pins of the chain, and a rail holder that holds the guide rail, and the endless chain module includes an endless chain in which a pair of links are connected by a joint pin; A pair of base sprockets that support the endless chain in a circulatory manner, and a bottom side of the endless chain that is disposed inside the pair of base sprockets from the outside, and the bottom side of the endless chain from the lower end of the adjacent base sprocket. A pair of wound sprockets that are pulled up (wound an endless chain around a larger area of the base sprocket), an overhanging sprocket that is disposed inside the pair of wound sprockets and hangs from the inside to the lower side of the endless chain; The endless chain on any of the sprockets A driving means for providing a driving force for circulating.

  In order to make the holding of the connecting pin stronger, it is desirable to adopt a configuration in which the tooth height of the base sprocket is less than the radius of the joint pin of the endless chain.

  In the pallet transfer device for workpiece transfer according to the present invention, the pallet is configured to include the two connection pins in parallel, and the endless chain module is provided with a double-line portion in which the support sides run side by side. It is possible to adopt a configuration in which the circulations of the endless chain modules are synchronized and arranged in parallel with each other.

Furthermore, it is possible to adopt a configuration in which the guide rails are arranged in parallel at intervals and provided with replacement means for alternately fitting a part of each guide rail.
At that time, the replacement means is provided with a plurality of pallet transfer trajectories existing in a part of each guide rail at a plurality of multiple intervals between the joint pins of the endless chain, and can be used for changing the pallet transfer interval, etc. it can.

  A feed chain module is provided at one end of the endless chain module, a pickup chain module is provided at the other end of the endless chain module, and the feed chain module and a joint pin adjacent to the pickup chain module are provided on the pallet. It is good also as a pallet transfer apparatus for work conveyance provided with the sub connection pin inserted in between.

  According to the pallet transfer device for workpiece conveyance according to the present invention, since a metal chain can be adopted, for example, it has high durability even in a high-temperature atmosphere, and can be used for workpiece conveyance without attaching a special jig to the chain. The pallet can be transferred accurately, and a structure that prevents the original movement of the chain can be avoided in order to reliably support the pallet.

  In addition, the sprocket for driving the chain by setting the tooth height of the base sprocket to be less than the radius of the joint pin of the endless chain or providing a groove in the base sprocket for accommodating the connecting pin. This also eliminates the problem of hindering the invasion of the connecting pin, and by attaching the winding sprocket and the overhanging sprocket, it prevents chain loosening and slippage associated with shortening the base sprocket teeth. The endless chain can be accurately and reliably circulated.

  A structure having replacement means for alternately fitting a part of the guide rails arranged in parallel is adopted, and a transfer track of a pallet existing in a part of each guide rail is connected to the replacement means between the joint pins of the endless chain. By providing a plurality of pallets at multiple intervals, it is possible to accurately transfer pallets that transport workpieces at desired intervals in units of pallets, and to transfer them seamlessly (without intermittently driving an endless chain). It becomes.

  A feed chain module is provided at one end of the endless chain module, a pickup chain module is provided at the other end of the endless chain module, and the feed chain module and a joint pin adjacent to the pickup chain module are provided on the pallet. By adopting a configuration including a sub-connecting pin inserted between them, the pallet can be connected to and detached from the transfer path without delay.

It is a front view which shows an example of the endless cha module of the pallet transfer apparatus for workpiece conveyance by this invention. It is the principal part enlarged view seen from the front which shows an example of the endless chain module of the pallet transfer apparatus for workpiece conveyance by this invention. It is a principal part expanded sectional view of the AA arrow in FIG. 8 which shows an example of the pallet transfer apparatus for workpiece conveyance by this invention. It is a principal part expanded sectional view of the BB arrow in FIG. 8 which shows an example of the pallet transfer apparatus for workpiece conveyance by this invention. It is a principal part expanded sectional view of CC arrow in FIG. 8 which shows an example of the pallet transfer apparatus for workpiece conveyance by this invention. It is the front view and sectional drawing which show an example of the sprocket used for the endless chain module of the pallet transfer apparatus for workpiece conveyance by this invention. It is the front view and sectional drawing which show an example of the sprocket used for the endless chain module of the pallet transfer apparatus for workpiece conveyance by this invention. It is the front view which shows an example of (A) endless chain module, etc., (B) front view and (C) top view showing an example of a rail etc. of the pallet transfer device for work conveyance by the present invention. It is DD arrow sectional drawing in FIG. 8 which shows an example of the pallet transfer apparatus for workpiece conveyance by this invention. It is FF arrow sectional drawing in FIG. 8 which shows an example of the pallet transfer apparatus for workpiece conveyance by this invention. It is EE arrow sectional drawing in FIG. 8 which shows structural examples, such as a substitution means of the pallet transfer apparatus for workpiece conveyance by this invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a workpiece transfer pallet transfer device (hereinafter referred to as “transfer device”) according to the present invention will be described below in detail with reference to the drawings.
1 includes a pallet 1 on which a workpiece (not shown) is detachably mounted, a guide rail 2 serving as a transfer track of the pallet 1, and a guide rail 2 that supports the pallet 1 in a detachable manner. An endless chain module 3 using a metal chain laid in parallel is provided.

The pallet 1 in this example includes a connection pin 8 that is connected to and removed from the endless chain module 3 and a rail holder 1 d that holds the guide rail 2.
The example shown in FIG. 1 includes a pallet part 1a, a connecting part 1b, and a relay part 1c that connects the two parts with a step.
The pallet part 1a of the example includes a fixing pin 9 rising from its upper surface, and the connecting part 1b has the connecting pin 8 suspended from its lower surface (see FIG. 3).

The endless chain module 3 in this example can circulate between a stainless endless chain in which a pair of inner links 3a and outer links 3b are alternately connected via joint pins 3c, and both ends of the support side of the endless chain. A pair of base sprockets 4 and 4 supported on the base sprocket 4 and a pair of windings arranged on the inner side of the base sprockets 4 and 4 and hooked from the outside on the lower side of the endless chain to wind the lower side of the endless chain around the adjacent base sprockets 4 and 4 Attached sprockets 5, 5; a pair of overhanging sprockets 6, 6 disposed on the inside of the winding sprockets 5, 5 and hanging on the lower side of the endless chain; and the winding sprockets 5, 5 or the overhanging sprocket Drive means 7 is provided for applying a driving force for circulating the endless chain to any one of 6 and 6.
The connecting pin 8 of the pallet 1 is inserted between adjacent joint pins 3c and 3c of the endless chain.

In the example shown in FIG. 1, the pair of base sprockets 4, 4, the pair of wound sprockets 5, 5, and the pair of overhanging sprockets 6, 6 are each one of various sprockets 4, 5, 6. A pair of base sprockets 4 and 4 are arranged symmetrically, and the upper end (support side) of the endless chain is horizontally supported at the top of the pair of base sprockets 4 and 4, and the lower end of the endless chain is horizontally supported by the pair of projecting sprockets 6 and 6. To support.
In this example, the winding sprockets 5, 5 are arranged close to the lower part of the base sprockets 4, 4, and the overhanging sprockets 6, 6 are close to the same height as the winding sprockets 5, 5. (See FIG. 2).

In this example, all of the sprockets used in the endless chain module 3 have the same diameter and the same number of teeth for supporting the endless chain.
In addition, the base sprocket 4 of this example is a driven gear, and its tooth height is set to be not less than one third of the radius of the endless chain joint pin 3c (see FIGS. 4 and 6).
The wound sprocket 5 of this example is at least one drive gear connected to the drive shaft of the drive means 7, and its tooth height is at least about the width of the outer link 3b (vertical direction in FIG. 2). It is set (see FIG. 7).
The overhanging sprocket 6 is a driven gear, and its tooth height is set to at least the width of the outer link 3b (see FIG. 7).

  The base sprocket 4 is formed by forming the connecting pin 8 into a flat shape having a relatively narrow width instead of lowering the tooth height, and a groove (not shown) in which the connecting pin 8 fits in each tooth. It is good also as a structure which is provided next to the outer periphery.

As a result of each of the sprockets 4, 5, 6 having the above-described configuration and the above-described arrangement, the endless chain is dropped from the sprockets 4, 5, 6 while the tooth height of the base sprocket 4 is set to be relatively low. Therefore, the driving force of the driving means 7 can be reliably transmitted to the endless chain.
On the contrary, since the tooth height of the base sprocket 4 is set to be relatively low, the ability to hold the connecting pin 8 in the space formed between the joint pins 3c, 3c of the endless chain can be enhanced.

The above example is implemented, for example, in the following form.
The example shown in FIG. 8 uses a pallet 1 having two connecting pins 8 arranged in parallel on the lower surface of the connecting portion 1b, and the endless chain module 3 having the same specification, a double-track portion in which each end portion runs in parallel. The pallet transfer device is arranged alternately and in parallel with an interval equal to that between the two connecting pins 8 and 8 (see FIG. 8).
The guide rail 2 serving as the transfer track of the pallet 1 is installed at a position away from the connecting pin 8 closer to the guide rail 2 and has a length approximately 2 times the length of the endless chain module 3. Doubled.

In this example, both endless chain modules 3 and 3 are connected to the base sprocket 4 on the end side of the endless chain module 3 (hereinafter referred to as the “first module”) arranged on the start end side of the transfer track, and the endless side arranged on the end side. A base sprocket 4 (hereinafter referred to as “cooperating sprocket”) on the start end side of the chain module 3 (hereinafter referred to as “second module”) is fixed to a single rotating shaft with the phases of both teeth being matched ( 4), the two endless chain modules 3 and 3 are connected to each other to extend the length of the support side substantially twice (see FIG. 8A).
In this example, one of the two endless chain modules 3, 3 is a wound sprocket 5, 5 as a driving sprocket, and the endless chain modules 3, 3 are synchronously circulated via the cooperative sprockets 4, 4. Is realized.

  As a result of being configured as described above, the first embodiment holds, for example, one connecting pin 8 (hereinafter referred to as “first connecting pin”) from the start end to the end (transfer direction) of the first module 3. An endless chain (hereinafter referred to as “first chain”) independently transfers the pallet 1 (see FIG. 3), and at the time when the end of the first module 3 is reached, the first chain and the second module 3 Both endless chains (hereinafter referred to as “second chain”) hold both connecting pins 8 of the pallet 1 (see FIG. 4), and immediately after that, the first connecting pins 8 are released from the first chain. The transfer of the pallet 1 is started by the second chain alone holding the other connecting pin 8 (hereinafter referred to as “second connecting pin”) (see FIG. 5).

  As in the above example, the endless chain module 3 is connected in two or three steps in a staggered or stepped manner by using the overlapping base sprockets 4 and 4 as cooperating sprockets, thereby providing a complicated design. The transfer trajectory of the pallet 1 can be extended relatively easily without any problem.

Further, the example shown in FIG. 8 is provided with another guide rail (hereinafter referred to as “sub rail 10”) in parallel with the guide rail 2 (hereinafter referred to as “main rail 2”) of the above example (directly below in this example). The endless chain module (subchain module 11) including an endless chain for holding the connecting pin 8 of the pallet 1 transferred on the subrail 10 is placed on the side of the subrail 10 on both sides of the above example. It is provided in parallel with the endless chain modules 3 and 3.
Further, this example includes replacement means 12 for alternately fitting a part of the main rail 2 and the sub rail 10 as the common rail 20.

  In addition, this example is provided with a feed chain module 13 above the start end of the endless chain module 3 (hereinafter referred to as “main chain module 3”) of the first embodiment, and above the end of the main chain module 3. Furthermore, the pick-up chain module 14 is provided so that the lower side of each is parallel to the support side of the main chain module 2.

  The end sprocket 15 of the feed chain module 13 and the start sprocket 16 of the pick-up chain module 14 are provided with a groove 17 on each tooth on the outer periphery thereof (FIGS. 3 and 7). The tooth height can be lowered to less than the radius of the joint pin 3c instead of the configuration.

  The end sprocket 15 of the feed chain module 13 is connected to the start end sprocket of the main chain module 3 (the leftmost base sprocket 4 in the figure) by the respective relay gears 18 and 19 (see FIG. 3), and the pick-up chain The start end sprocket 16 of the module 14 is connected to the end sprocket of the main chain module 3 (the rightmost base sprocket 4 in the figure) by respective relay gears 18 and 19 (see FIG. 9).

  The pitch of the endless chain used in the above example (between adjacent joint pins 3c, 3c) is all set equal, and even in sprockets 4, 5, 6, 15, 16, it is an integral multiple of the pitch of the endless chain. The tooth pitch is set equal, and the gear ratio of the relay gears 18 and 19 is set equal.

The main rail 2 and the sub rail 10 in this example are in a positional relationship in which the common rail 20 can be alternately connected to each other at both left and right ends.
Further, the replacement means 12 in this example accurately travels between the main rail 2 and the sub rail 10 through the short rails (the common rails 20 and 20) that are the start and end of the rails 2 and 10. This is an air cylinder.
The common rails 20, 20 include a plurality of holders 22 that hold a replacement guide 21 for restricting the replacement track of the air cylinder, and along the replacement guide 21, a start end (left end of the drawing) of the main rail 2 It goes back and forth between the terminal end (left end in the drawing) of the sub rail 10 and between the terminal end (right end in the drawing) of the main rail 2 and the start end (right end in the drawing) of the sub rail 10.

When this example is adopted, the pallet 1 includes a sub-connecting pin 23 on the upper surface of the connecting portion 1b and a pair of rollers 25 that sandwich the transfer guide 24 on the transfer track (see FIG. 11).
The sub-connecting pin 23 in this example is formed into a long flat shape along the transfer track.
On the start end side of the main rail 2, the sub-connecting pin 23 of the pallet 1 on the main rail 2 is arranged so that the common chain 20 reaches the start end of the main rail 2 and the feed chain module 13 has the A connecting pin (hereinafter referred to as “main connecting pin 8”, which is inserted between the connecting pins 3c and 3c and is suspended by the feed chain module 13 between the connecting pins 3c and 3c of the main chain module 3 on the lower surface of the connecting portion 1b. ”) Until it is inserted.

On the terminal end side of the main rail 2, the sub-connecting pin 23 of the pallet 1 on the main rail 2 is arranged such that when the common rail 20 reaches the terminal end of the main rail 2, The main connecting pin 8 is inserted between the joint pins 3c, 3c and the joint pin 3c, 3c of the main chain module 3 is separated from the joint pin 3c. It is transferred until it reaches the position of the station.
When the pallet 1 reaches the predetermined station, the common rail 20 on which the pallet 1 is placed is transferred to the right end of the sub rail 10 by the replacement means 12.

In this example, the left and right shared rails 20, 20 connected to the sub rail 10 are provided with a plurality of stations on the left and right sides.
In this example, each station is set at the position of three transfer guides 24, 24, 24 laid in parallel to restrict the transfer trajectory of the pallet 1 on the left and right shared rails 20, 20.
Each of the transfer guides 24 in this example is set at multiple intervals between the joint pins 3c, 3c of the endless chain, and is separated from the transfer guide 24 at the innermost position (first point) of the common rail 20 by 4 pitches. It is fixed at a right angle to the sub-rail 10 at a position (second point) and a position (third point) separated by 6 pitches.

  As a result, all the chain modules 3, 11, 13, and 14 are stopped when the shared rails 20 and 20 are transferred, and all the chain modules 3, 11, 13, and 14 are transferred at the same speed during operation. On the premise that the pallet 1 folded back at the first point is turned back at the third point in the main chain module 3 with a further 8 pitch delay than before. The pallet 1 is further delayed by 12 pitches than before, and the pallet 1 that has been flowing in units of 8 pitches until then is folded back at the second point, so that the transfer interval is doubled and folded back at the third point. As a result, the transfer interval becomes 2.5 times.

  The above example is based on the premise that all the chain modules 3, 11, 13, and 14 are transferred at the same speed during operation. In the first embodiment, the first module 3 and the second module are used. It is also possible to adopt a configuration in which a difference in the transfer speed of 3 is provided.

For example, the base sprocket 4 on the terminal end side of the first module 3 in the transfer track and the base sprocket 4 on the start end side of the second module 3 that overlaps with the base sprocket 4 are arranged at the stationary phase of both teeth. A plurality of endless chain modules 3 and 3 having different transfer speeds are fixed to a rotating shaft of a concentric structure that coincides with each other and independently rotate as drive sprockets that independently rotate the overlapping base sprockets 4 and 4, respectively. By connecting them in a staggered or stepped manner, the transfer trajectory of the pallet 1 can be extended relatively easily without giving a complicated design.
The overhanging sprocket 6 and the wound sprocket 5 may be the driving sprocket.

  As a result of the configuration of the third embodiment, the plurality of connecting pins 8 arranged in parallel on the back surface of each pallet 1 are connected to the endless chain joint pins 3c, 3c of each chain module 3 in the same manner as in the above-described embodiment. A plurality of pallets 1 can be transferred at different intervals for each chain module 3 along a series of main rails 2 while being repeatedly held and detached.

  For example, if the transfer speed of a specific chain module 3 is increased while intermittent transfer is performed at the same time interval, the transfer interval in the region of the chain module 3 becomes longer, and conversely, the transfer speed of the specific chain module 3 is increased. If it is delayed, the transfer interval in the region of the chain module 3 is shortened.

  At that time, in order to smoothly hold and remove the endless chain module 3 between the endless chain modules 3 having different transfer speeds between the joint pins 3c and 3c, a plurality of connecting pins 8 provided in the pallet 1 are simultaneously endless at the intermittent transfer stop point. Including the point held by the endless chain of the chain module 3 (hereinafter referred to as “connection point”), the joint pins 3c and 3c of the endless chain at the time of stop (intermittent) are matched and the initial movement from the connection point Control means for equalizing the transfer acceleration or transfer speed at the time (from the connection point to the point where at least the connection pin of the pallet 1 is held by the endless chain of the single endless chain module 3) Requested.

  According to the third embodiment, for example, in a process that requires a relatively large work area, such as complicated processing or assembly, the pallet 1 is moved at a large interval, while an inspection process after the assembly is performed. It is possible to rationalize the pallet transfer while using the same workpiece transfer pallet transfer device, for example, by reducing the transfer interval of the pallet 1 in a process that is sufficient with a small work area that can be installed.

1 palette,
1a pallet part, 1b connecting part, 1c relay part, 1d rail holder,
2 guide rails,
3 Endless chain module,
3a inner link, 3b outer link, 3c joint pin,
4 base sprocket, 5 winding sprocket, 6 overhang sprocket,
7 drive means,
8 connecting pins, 9 fixing pins,
10 subrails, 11 subchain modules,
12 replacement means, 13 feed chain module, 14 pick-up chain module,
15 end sprocket, 16 start sprocket,
17 groove, 18 relay gear, 19 relay gear,
20 common rails, 21 replacement guides, 22 holders,
23 sub-connecting pin, 24 transfer guide, 25 rollers,

Claims (6)

A pallet on which a workpiece is detachably mounted, a guide rail that is held by the pallet and serves as a transfer track for the pallet, and an endless chain module that is detachably connected to the pallet and is laid in parallel with the guide rail,
The pallet includes a connection pin inserted between adjacent joint pins of the chain, and a rail holder that holds the guide rail,
The endless chain module includes an endless chain in which a pair of links are connected by a joint pin, a pair of base sprockets that support a support side of the endless chain in a circulatory manner, and an endless chain disposed inside the pair of base sprockets. A pair of wound sprockets that hang on the lower side of the chain from the outside and pull the lower side of the endless chain upward from the lower end of the adjacent base sprocket, and are arranged inside the pair of wound sprockets and hang on the lower side of the endless chain from the inside A workpiece pallet transfer device comprising: an overhanging sprocket; and a driving means for applying a driving force for circulating the endless chain to any one of the sprockets.   The pallet transfer device for workpiece conveyance according to claim 1, wherein a tooth height of the base sprocket is less than a radius of a joint pin of the endless chain. The pallet comprises two connecting pins in parallel,
The endless chain module is arranged in parallel with the circulation of each endless chain module being synchronized with the interval between the connecting pins while providing a double-line portion in which the support sides run parallel to each other. The workpiece conveying pallet transfer device according to any one of the above. The guide rails are arranged in parallel at intervals,
The pallet transfer device for workpiece conveyance according to any one of claims 1 to 3, further comprising replacement means for alternately fitting a part of each guide rail.   The pallet transfer device for workpiece transfer according to claim 4, wherein the replacement means includes a plurality of pallet transfer tracks existing in a part of each guide rail at a plurality of multiple intervals between joint pins of the endless chain. A feed chain module is provided at one end of the endless chain module, and a chain module is provided at the other end of the endless chain module;
The said pallet is a pallet transfer apparatus for work conveyance in any one of Claim 4 or Claim 5 provided with the sub connection pin inserted between the joint pins which adjoin the said feed chain module and the said pick-up chain module.

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