JP2008239292A - Transfer device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce cost, and improve reliability by a simple and space-saving constitution. <P>SOLUTION: The device is provided with a carriage 3 supported by a base 2 in a slidable way forward and backward along the carrying direction of a floor conveyor, and driven by a travel drive device, multi-stage columns 4, comprising a fixed column 5 fixed on the carriage 3, and extended vertically, and a lifting column 6 vertically slidable with respect to the fixed column 5, and a workpiece receiving member 9, installed on an upper end part of the lifting column 8 at the uppermost stage of the multi-stage column 4. The workpiece carried by an overhead conveyor 41 is received by the workpiece receiving member 9 by extending the multi-stage column 4, and the multi-stage column 4 is contracted to lower the workpiece. In the middle of lowering, the carriage 3 is moved in the carrying direction synchronously with moving speed of the floor conveyor, and the workpiece is transferred to the floor conveyor. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a transfer device from an overhead conveyor to a floor conveyor.

As a conventional transfer device from an overhead conveyor to a floor conveyor, a workpiece transported by the overhead conveyor is received by an arm of a drop lifter placed upright across the slat conveyor, and the arm is lowered to lower the table lifter. The workpiece is transferred to the slat conveyor by gradually lowering the table while the table lifter travels synchronously with the slat conveyor (see, for example, Patent Document 1).
Here, as a lifting mechanism for the table lifter, an X-shaped symmetrical link that pivotally supports the midpoint between the upper and lower ends of two links having the same length is arranged on the left and right, and the X-shaped symmetrical link The upper and lower ends of the front side or the rear side of the X-shaped symmetrical link are attached to the transport base (lifting part) and the base (movable part) so as to be rotatable around a horizontal axis perpendicular to the transport direction. A link mechanism (see, for example, Patent Document 2) is used in which upper and lower ends are slidably mounted in a transport direction on a transport base and a base.

JP-A-2-286515 (FIGS. 1 and 8) Japanese Patent Laid-Open No. 63-22425 (Fig. 3-6)

In the above conventional transfer device, since the lifting mechanism of the table lifter is a link mechanism including an X-shaped symmetrical link or the like, a large lifting stroke cannot be secured. Therefore, since it is necessary to use a table lifter and a drop lifter erected across a slat conveyor that is a floor conveyor, the structure of the transfer device is complicated.
In addition, since the work received by the drop lifter from the overhead conveyor is required to be placed on the table lifter, the sensor processing system and control system for that work are complicated.
Therefore, the cost increases and the reliability of transferring the workpiece from the overhead conveyor to the floor conveyor decreases. In addition, since the space around the transfer device is large, the space efficiency in the factory is deteriorated.

  Therefore, in view of the above-described situation, the present invention intends to solve the problem that a large lifting stroke can be secured, so that it is not necessary to use a drop lifter and a table lifter together, and the cost is reduced by a simple and space-saving configuration. It is in the point which provides the transfer apparatus which can improve reliability while being able to reduce.

  In order to solve the above problems, the transfer device according to the present invention is a transfer device from an overhead conveyor to a floor conveyor, a base fixed to a floor surface or a support frame, and the floor conveyor by the base. A pedestal that is supported so as to be slidable back and forth along the conveying direction of the vehicle, is driven by a traveling drive device, travels in a vertical direction with respect to the fixed column, and a fixed column that is fixed to the platform and extends in the vertical direction. It is composed of a slidable lifting column or a plurality of lifting columns, and is provided with a multistage column that is driven by a lifting drive device to expand and contract in the vertical direction, and a work holder attached to the upper end of the uppermost lifting column of the multistage column. The workpiece conveyed by the overhead conveyor is received by the workpiece holder with the multistage struts extended by the elevation drive device, and the elevation drive device The multistage struts are contracted to lower the work, and the work is moved in the transport direction by the travel drive device in the middle of lowering, and the work is moved in synchronization with the moving speed of the floor conveyor. It is to be transferred to the floor conveyor.

  Here, it is preferable that the floor conveyor is a double slat conveyor, and the traveling platform and the multistage strut are positioned between the double slat conveyors.

  The lifting column is a two-stage lifting column, a lower stage and an upper stage, a fixed sprocket attached to the fixed column, a plurality of lower stage lifting sprockets attached to the lower column, and the fixed column. The drive sprocket to which the output shaft of the rotary drive device is connected and both ends are fixed to the fixed struts, and the intermediate part is spanned between the fixed sprocket, the lower lift sprocket and the drive sprocket, and the lower lift lift The number of parts of the chain that extends over the lower part of the lower lifting sprocket, the length of which varies, and the number of parts of the chain that extends over the lower part of the lower lifting sprocket are equal and The upper chain attached to the front and rear or the left and right of the upper end of the lower lifting column An upper chain in which an intermediate part that spans both the elevating sprocket and the upper elevating sprocket from above is brought into contact with a chain abutting portion provided on the upper elevating support column, and both ends are fixed to the fixed support column. Are preferably provided.

  The transfer device according to the present invention is a transfer device from an overhead conveyor to a floor conveyor, and a base fixed to a floor surface or a support frame, and the base is moved back and forth along the transport direction of the floor conveyor. Slidably supported by the traveling drive device, and a stationary column that is fixed to the traveling platform and extends in the vertical direction, and one or more that can slide in the vertical direction with respect to the stationary column. A multi-stage strut comprising an elevating strut, which is driven by an elevating drive device and expands and contracts in the vertical direction, and a work holder attached to the upper end of the uppermost elevating strut of the multi-stage strut, and is conveyed by the overhead conveyor. The workpiece is received by the workpiece holder by extending the multi-stage column with the lifting drive device, and the multi-stage column is received by the lifting drive device. The workpiece is moved down, and the workpiece is transferred to the floor conveyor in the state where the traveling drive device is moved in the transport direction by the traveling drive device in synchronization with the moving speed of the floor conveyor. Therefore, it is possible to perform the transfer smoothly and surely while suppressing the impact during the transfer. And since a large raising / lowering stroke can be ensured by the multistage support | pillar which expands / contracts a raising / lowering support | pillar up and down with respect to a fixed support | pillar, it becomes unnecessary to use a drop lifter, a table lifter, etc. together. Therefore, since the configuration is simplified, the cost can be reduced and the reliability can be improved. In addition, since it is a lifting mechanism using only a single lifting device and a multi-stage support column, and space can be saved, the space in the factory can be used efficiently. Furthermore, since the adjustment work of the delivery from the drop lifter to the table lifter is not required, the installation work period can be shortened and the operation can be performed quickly.

  Further, when the floor conveyor is a double slat conveyor, and the traveling platform and the multistage strut are positioned between the double slat conveyors, in addition to the above effects, a narrow space between the double slat conveyors is effectively utilized, It is possible to efficiently transfer a work from an overhead conveyor to a double slat conveyor by arranging a transfer device having a space-saving configuration that secures a large lifting stroke.

  Further, the lifting column is a two-stage lifting column, a lower stage and an upper stage, a fixed sprocket attached to the fixed column, a plurality of lower stage lifting sprockets attached to the lower column, and the fixed column. The drive sprocket to which the output shaft of the rotary drive device is connected and both ends are fixed to the fixed struts, and the intermediate part is spanned between the fixed sprocket, the lower lift sprocket and the drive sprocket, and the lower lift lift The number of parts of the chain that extends over the lower part of the lower lifting sprocket, the length of which varies, and the number of parts of the chain that extends over the lower part of the lower lifting sprocket are equal and The lower chain, which is an even number, and attached to the front and rear or left and right of the upper end of the lower lifting column For the upper stage in which the intermediate part spanned from both the upper and lower lift sprockets and the upper lift sprocket is brought into contact with the chain contact part provided on the upper lift pillar from the lower side and both ends are fixed to the fixed pillar. When the chain is provided, in addition to the above-described effects, the lower-stage chain can operate smoothly without slackening, and the lower-stage lifting column can be raised and lowered smoothly and stably at an elevation speed proportional to the rotational speed of the rotation drive device. In addition, since the rotary drive device that drives the lower chain can be disposed under the fixed support on the lower side of the traveling platform, stability during traveling can be improved. In addition, since the main functional parts such as the rotary drive device, the sprocket and the chain can be concentrated and arranged at a low position, the reliability and maintainability can be improved. In addition, since the two-stage lifting column is used and the upper lifting column is lifted and lowered in the same direction in conjunction with the lifting of the lower lifting column, a large lifting stroke can be secured while keeping the height of the column lower. .

Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments shown in the accompanying drawings, and all the embodiments that satisfy the requirements described in the claims are described. Is included. In addition, in this specification, the conveyance direction (refer arrow A in the figure) of an overhead conveyor and a floor conveyor shall be the front, and the left and right shall be referred to as the front.
FIG.1 and FIG.2 is explanatory drawing of the transfer apparatus 1 concerning embodiment of this invention, FIG. 1 is a perspective view, FIG. 2 is a left view. 3 to 6 are explanatory views of the structure of the multistage support column 4. FIG. 3 and FIG. 5 are left side views, and FIG. 4 and FIG. 3 and 4 show a state in which the multistage column 4 is extended, and FIGS. 5 and 6 show a state in which the multistage column 4 is contracted.

  As shown in FIGS. 1 and 2, the transfer device 1 transfers a heavy work such as a car body of an automobile from an overhead conveyor 41 to a floor conveyor (not shown). The base 2 fixed to the base 2, supported by the base 2 so as to be slidable back and forth along the transport direction A, and driven by a travel drive device such as a rotary drive device 10 described later, the travel platform 3 , And a workpiece support attached to the upper end of the upper lift column 8 which is the uppermost lift column 8 of the multi-stage column 4. 9 mag.

As shown in FIG. 2, a rotary drive device 10, which is a geared motor having an orthogonal shaft configuration using, for example, a hypoid gear or a bevel carrier, is fixed to the lower side of the frame body 3 </ b> A of the traveling platform 3. A drive sprocket 11 that rotates around is connected, and idle sprockets 12 and 13 that rotate around a left-right axis are attached to the frame body 3 </ b> A of the carriage 3 before and after the lower side of the drive sprocket 11.
Further, the front and rear ends 14A and 14B of the chain 14 extending in the front-rear direction are fixed to the base 2, and an intermediate portion of the chain 14 is drawn upward via the front and rear idle sprockets 12 and 13 to the drive sprocket 11. The chain 14, the rotary drive device 10, the drive sprocket 11, and the idle sprockets 12 and 13 constitute the travel drive device.

  As shown in FIGS. 1 and 2, the traveling table 3 is supported by the base 2 so as to be slidable back and forth along the transport direction A as described above via a linear guide (not shown). Wheels 16 are attached to the front, rear, left and right of the shape frame body 3A. Therefore, when the drive sprocket 11 is rotated by driving the rotational drive device 10 of the travel drive device, a thrust is generated in the travel platform 3 itself as if the chain 14 is dragged, so that the wheels 16,. 2 and rolls on the rails 15 and 15 fixed to the upper surfaces of the left and right rail support members 2A and 2A extending in the front-rear direction, and the carriage 3 moves in the front-rear direction.

As shown in FIGS. 1 and 2, a fixed column 5 extending in the vertical direction is connected and fixed to the center of the frame 3 </ b> A having a substantially rectangular shape in plan view in the front and rear direction of the opening 3 via a connecting member 3 </ b> B. The The multi-stage column 4 includes a fixed column 5 and a lifting column 6 that can slide in the vertical direction with respect to the fixed column 5, and the lifting column 6 includes a lower column column 7 and an upper column 8.
In the present embodiment, the elevating support column 4 is composed of two stages of the lower and upper elevating supports 7 and 8 as described above. However, the elevating support column 4 may be one (single) or three or more stages. There may be.
That is, the multistage support column 4 according to the present invention includes a fixed support column 5 and a single or a plurality of lifting columns 6.

Next, the slide support structure of the multistage support column 4 will be described.
As shown in FIGS. 1 and 3 to 6, the fixed column 5, the lower lift column 7, and the upper lift column 8 are substantially rectangular cylindrical bodies (for example, square structure square pipes) in plan view. The lower elevating column 7 contains a lower elevating column 7 and the lower elevating column 7 contains an upper elevating column 8.
Further, guide rollers 5A,... Rotating around the horizontal axis along each side surface are attached to the fixed support 5 in the upper and lower openings on the front, rear, left, and right side surfaces, and the rolling surfaces of the guide rollers 5A,. It protrudes outward and inward of the column 5. Further, guide rollers 7A,... Rotating around horizontal axes along the respective side surfaces are attached to the lower elevating support column 7 in the upper and lower openings, and the rolling surfaces of the guide rollers 7A,. It protrudes outward and inward of the lower lift column 7.
Since the guide rollers 5A contact the outer surface of the lower lifting column 7 and the guide rollers 7A contact the inner surface of the fixed column 5, the lower lifting column 7 moves vertically with respect to the fixed column 5. Since the guide rollers 7A,... Are in contact with the outer surface of the upper lift column 8, the upper lift column 8 can slide in the vertical direction with respect to the lower lift column 7.
.. And the guide rollers 7A,... And the guide rollers 7A,..., And the guide rollers 7A,. Since the load is distributed and supported, the multistage support column 4 can be smoothly expanded and contracted in the vertical direction. Therefore, for example, even when a work that is a heavy object is placed on the work holder 9 with the multistage strut 4 extending upward, the work is stably supported by the multistage strut 4, and the multistage strut 4 By shrinking 4, the workpiece can be stably and reliably transferred to the floor conveyor.

Next, the elevating drive device and the chain interlocking mechanism will be described.
First, the structure which raises / lowers the lower elevating support column 7 with respect to the fixed support column 5 will be described.
As shown in FIG. 3 and FIG. 5, a rotary drive device 20, for example, a geared motor, is fixed to the fixed column 5 in front of the lower portion thereof, and a drive sprocket 21 that rotates about a horizontal axis is connected to its output shaft. The fixed sprocket 22 that rotates about the left and right axis is obliquely above the front side of the drive sprocket 21, the fixed sprocket 23 that rotates about the left and right axis is in front of the lower end, and the left and right ends of the fixed sprocket 23 are rotated about the left and right axis. Fixed sprockets 18 and 19 are attached.
Also, at the lower part of the lower elevating support column 7, the lower elevating sprockets 25 and 26 rotating around the left and right axis, and the lower elevating sprocket positioned below the lower elevating sprocket 25 and rotating around the left and right axis 27 is attached.
The fixed sprockets 18, 19, 22, and 23 are attached to the fixed support column 5. Therefore, the lower elevating sprockets 25, 26, and 27 are attached to the lower elevating support column 7. Therefore, it moves up and down together with the lower lifting column 7.
Further, the lower chain 17 having one end 17A fixed to the upper rear surface of the fixed column 5 is routed upward, and above the fixed sprocket 19, below the movable sprockets 26 and 25, above the fixed sprocket 18, and to the drive sprocket. 21, the upper side of the fixed sprocket 22, the lower side of the fixed sprocket 23, and the upper side of the movable sprocket 27. Abutting along the lower side of the chain abutting plate 24, which is the provided chain abutting portion, is further routed to the rear upper side, and the other end 17 </ b> B is fixed to the lower rear side of the fixed column 5.

In the lower chain 17 routed as described above, as shown in FIGS. 3 and 5, the lower lift sprocket 25, which is a part of the lower lift sprocket 7, whose length changes as the lower lift pillar 7 is lifted and lowered, 26 and the lower chain 17 extending over and extending downward, and the lower chain 17 extending downward through the lower lifting sprocket 27 of the lower lifting sprockets 25, 26, and 27. The number of the portions D1 and D2 is equal to two.
Accordingly, for example, when the lower elevating support column 7 is lowered from the state shown in FIG. 3 to the state shown in FIG. 5 by rotating the drive sprocket 21 by the rotary drive device 20, the elevating sprockets 25 to 27 are raised and lowered. The lengths of the chains U1 and U2 extending upward from 25 and 26 are increased, and the lengths of the chains D1 and D2 extending downward from the lower lift sprocket 27 are shortened by this length. Therefore, the lower chain 17 operates smoothly without slackening, and the lower lifting column 7 descends smoothly and stably at a lowering speed proportional to the rotational speed of the rotary drive device 20.
Similarly, when the lower elevating support column 7 is raised from the state shown in FIG. 5 to the state shown in FIG. 3, similarly, a part U1, U2 of the lower chain 17 that extends over the lower elevating sprockets 25, 26 and extends upward. Since the length of the portions D1 and D2 of the lower-stage chain 17 that extends over the lower-stage lifting sprocket 27 and extends downward is increased by the shortened length of the lower-stage chain 17, the lower-stage chain 17 operates smoothly without slackening. At the same time, the lower lifting column 7 rises smoothly and stably at a rising speed proportional to the rotational speed of the rotary drive device 20.
Note that the length of the lower lifting / lowering sprocket 7 changes in length as a result of the lower lifting / lowering support column 7 being lifted and hung over a part of the lower lifting / lowering sprocket and extended upward. The number of portions of the lower-stage chain 17 extending to the side may be equal and even.
According to the configuration as described above, the rotational drive device 20 that drives the lower chain 17 can be disposed below the fixed column 5 on the lower side of the traveling platform 3, so that stability during traveling is improved. be able to. In addition, the main functional components such as the rotary drive device 20 and the drive sprocket 21, the fixed sprockets 18, 19, 22, 23, the lower elevating sprockets 25, 26, 27, and the lower chain 17 are gathered at a low position. Since it can arrange | position, reliability and maintainability can be improved.

Next, the structure which raises / lowers the upper stage raising / lowering support | pillar 8 in the same direction linked with raising / lowering of the lower stage raising / lowering support | pillar 7 is demonstrated.
As shown in FIGS. 4 and 6, upper elevating sprockets 29 and 30 are attached to the left and right (may be front and rear) of the upper end portion of the lower elevating support column 7. On both sides, an upper chain 28 having both ends 28A and 28B fixed to the left and right side surfaces of the fixed column is stretched from above, and the upper chain 28 between the upper lift sprockets 29 and 30 is a chain stopper provided on the upper lift column. Since the upper elevating sprockets 29 and 30 are attached to the lower elevating support column 7, they are moved up and down together with the lower elevating support column 7.
Therefore, when the rotary drive device 20 is driven as described above to move the lower lift column 7 up and down, the upper lift sprockets 29 and 30 on which the upper chain 28 is stretched also move up and down. For example, from the state shown in FIG. When the lower elevating support column 7 is raised to the state shown in FIG. 4 and the upper elevating sprockets 29 and 30 are raised, the lower elevating support column 7 is located between the upper elevating sprockets 29 and 30 supporting the upper elevating support column 8. Therefore, the upper lift column 8 is further lifted with respect to the lower lift column 7.
Similarly, for example, when the lower lift column 7 is lowered from the state shown in FIG. 4 to the state shown in FIG. 6 and the upper lift sprockets 29 and 30 are lowered, the upper lift of the upper chain 28 supporting the upper lift column 8 is raised. Since the space between the sprockets 29 and 30 is lowered with respect to the lower lift column 7, the upper lift column 8 is further lowered with respect to the lower lift column 7.
By using the two-stage lifting columns 7 and 8 as described above and moving the upper lifting column 8 in the same direction in conjunction with the lifting of the lower lifting column 7, large lifting and lowering the column height is achieved. Stroke can be secured.
In the above configuration, the rotary drive device 20 and the drive sprocket 21, the fixed sprockets 18, 19, 22, 23, the lower stage elevating sprockets 25, 26, 27, the lower stage chain 17, and the upper stage elevating sprockets 29, 30 and the upper stage chain. Etc. constitute the elevating drive device.

Next, the operation of the transfer device 1 will be described.
As shown in FIG. 2, the workpiece (not shown) supported by the hangers 42 and 42 of the overhead conveyor 41 is conveyed on the upper side of the multi-stage column 4 of the transfer device 1. Stop. In this state, the multistage strut 4 is extended by the lifting drive device of the transfer device 1 and the workpiece is pushed up by the workpiece holder 9 so that the workpiece is lifted from the hangers 42 and 42. By opening, the workpiece can be lowered by the transfer device 1.
Thus, the transfer apparatus 1 which received the workpiece | work on the workpiece holder 9 shrinks the multistage support | pillar 4 with the said raising / lowering drive apparatus, and descend | falls a workpiece | work (refer arrow B in a figure). In the middle of the descent, the travel driving device causes the traveling platform 3 to travel in the moving direction of a floor conveyor (not shown) (see arrow C in the figure), and the work is moved to the floor in a state synchronized with the moving speed of the floor conveyor. Transfer onto the conveyor. Therefore, the transfer is completed smoothly and surely while suppressing the impact during the transfer.
Here, if the floor conveyor is a double slat conveyor, and the traveling platform 3 and the multistage support column 4 of the transfer device 1 are positioned between the double slat conveyors, the narrow space between the double slat conveyors can be effectively utilized. In addition, the transfer device 1 having a space-saving configuration in which a large lifting stroke is secured can be arranged to efficiently transfer the work from the overhead conveyor 41 to the double slat conveyor.

  According to the configuration of the transfer device 1 as described above, a large lifting stroke can be secured by the multi-stage column 4 that vertically expands and contracts the lifting column 6 with respect to the fixed column 5, so that the drop lifter and the table It is not necessary to use a lifter or the like together. Therefore, since the configuration is simplified, the cost can be reduced and the reliability can be improved. In addition, it is a lifting mechanism using only one lifting device and a multi-stage support column 4 and can save space, so that the space in the factory can be used efficiently. Furthermore, since the adjustment work of the delivery from the drop lifter to the table lifter is not required, the installation work period can be shortened and the operation can be performed quickly.

It is a perspective view of the transfer equipment concerning an embodiment of the invention. Similarly, it is a left side view. It is a left view of a multistage support | pillar, and has shown the state which extended the multistage support | pillar. It is the figure which looked at the multistage support | pillar from back, and has shown the state which extended the multistage support | pillar. It is a left view of a multistage support | pillar, and has shown the state which shrunk the multistage support | pillar. It is the figure which looked at the multistage support | pillar from back, and has shown the state which shrunk the multistage support | pillar.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Transfer apparatus 2 Base 2A Rail support member 3 Traveling base 3A Frame body 3B Connection member 4 Multistage support | pillar 5 Fixed support | pillar 5A Guide roller 6 Lifting support pillar 7 Lower lift support pillar 7A Guide roller 8 Upper lift support pillar 9 Work support 10 Rotation drive Device 11 Drive sprocket 12, 13 Idle sprocket 14 Chain 14A, 14B Chain end 15 Rail 16 Wheel 17 Lower stage chain 17A, 17B Chain end 18, 19, 22, 23 Fixed sprocket 20 Rotation drive device 21 Drive sprocket 24 Chain contact plate (Chain contact part)
25, 26, 27 Lower lift sprocket 28 Upper chain 28A, 28B Chain end 29, 30 Upper lift sprocket 31 Chain contact plate (chain contact)
41 Overhead conveyor 42 Hanger FL Floor D1, D2 Part of lower chain U1 and U2 extending over lower elevating sprocket and extending downward Lower part of lower chain extending over lower elevating sprocket

Claims (3)

A transfer device from an overhead conveyor to a floor conveyor,
A base fixed to the floor or support frame;
A traveling table that is supported by the base so as to be slidable back and forth along the conveying direction of the floor conveyor, and is driven by a traveling drive device to travel,
A fixed column that is fixed to the platform and extends in the vertical direction; and a multi-stage column that is driven by the vertical drive device and expands and contracts in the vertical direction. ,
A workpiece support attached to the upper end of the uppermost lifting column of the multistage column,
The workpiece conveyed by the overhead conveyor is received by the workpiece holder by extending the multistage strut by the lifting drive device, and the workpiece is lowered by contracting the multistage strut by the lifting drive device, and from the middle of the lowering The transfer apparatus which transfers the said workpiece | work to the said floor conveyor in the state which moved the said traveling stand to the said conveyance direction with the said driving device, and was synchronized with the moving speed of the said floor conveyor.   The transfer apparatus according to claim 1, wherein the floor conveyor is a double slat conveyor, and the carriage and the multistage support column are positioned between the double slat conveyors. The lifting column is a two-stage lifting column of a lower stage and an upper stage,
A fixed sprocket attached to the fixed column;
A plurality of lower lift sprockets attached to the lower lift pillars;
A drive sprocket to which an output shaft of a rotary drive device attached to the fixed column is coupled;
Both ends are fixed to the fixed struts, the middle part is spanned over the fixed sprocket, the lower lift sprocket, and the drive sprocket, and the length is changed by the lifting of the lower lift struts, and is hung on a part of the lower lift sprocket A lower chain in which the number of parts of the chain that is passed and extends upward and the number of parts of the chain that extends across the lower part of the lower lifting sprocket are equal and even;
An upper lift sprocket attached to the front and rear or left and right of the upper end of the lower lift pillar;
An upper portion of the upper lifting / lowering sprocket is provided with an intermediate portion extending from the upper side to a chain contacting portion provided on the upper lifting / lowering support column, and an upper chain having both ends fixed to the fixed support column. The transfer device according to claim 1.

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