JP2012197128A - Meshing chain type advance/retreat operating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a meshing chain type advance/retreat operating device achieving the avoidance of a loss of driving energy, smooth chain driving and the effective use of a space.SOLUTION: The meshing chain type advance/retreat operating device 100 includes a pair of chain winding driving drums 120, 120 arranged with a space; a driving sprocket 130 provided at a side of one meshing chain 110 and engaged with the one meshing chain 110; and a chain guide member 140 arranged at the opposite side to the arranged side of the driving sprocket 130 viewed from a pair of meshing chains 110, 110, and guiding the other meshing chain from the side position of the other meshing chain 110 from a chain rigidified portion 110B to a chain disengaged portion 110A.

Description

  The present invention relates to an interlocking chain type advance / retreat operation device that moves a driven body forward and backward for use in manufacturing equipment in various manufacturing fields, transport equipment in the transport field, nursing care equipment in the medical and welfare field, stage equipment in the art field, and the like. .

Conventionally, as a meshing chain type advance / retreat operation device, a pair of meshing chains that are meshed with each other and driven integrally, that is, a so-called chuck chain is used to move a driven body and travel along a chain guide groove. There is a meshing chain lifting device that winds and stores a chain (for example, see Patent Document 1).
In addition, there is a winding device that spirally wraps a band such as a chain around the outer periphery of the winding wheel (see, for example, Patent Document 2).
In addition, there are pressure and / or tension load moving methods (for example, see Patent Document 3) used for the purpose of winding the chain link in a spiral manner, and a belt body extending and feeding device for moving the belt body forward and backward. (For example, refer to Patent Document 4).
There is also an elevating device that prevents the meshing chain from tilting and smoothly moves the rollers of the meshing chain into the roller guide slit (see, for example, Patent Document 5).

JP 2009-1377 A (refer to claims, FIG. 1) JP-A-8-324984 (refer to the claims, FIG. 2) Japanese translation of PCT publication No. 2002-511374 (refer to claims, FIG. 1) Japanese Patent Laid-Open No. 8-169693 (See Claims, FIG. 1) JP-A-1999-278797 (refer to the claims, FIG. 1)

However, in the conventional meshing chain type lifting device described above, a sliding resistance is generated between the linear storage rail and the meshing chain between the time when the pair of meshing chains are disengaged from each other and stored in the chain storage box. Therefore, the driving force for driving the meshing chain is increased to cause a loss of driving energy, and at the same time, there is a problem in chain driving that makes smooth chain driving difficult.
Further, in the above-described meshing chain type lifting device, the chain disengagement portion after the inertia chain traveling or disengagement of the meshing chain by a guide such as a chain guide plate that is provided in the crotch region of the pair of meshing chains and restricts the travel of the meshing chain In order to avoid sagging, the sliding contact resistance between the meshing chain and the chain guide plate is avoided to reduce the loss of drive energy and make it difficult to drive the chain smoothly.
In addition, the frequency of contact between the meshing chain and the chain guide part such as the linear storage rail described above, causing chain meandering or partial chain bending depending on the looseness of the chain engagement part, that is, insufficient chain tension. Since the sliding resistance is increased with the contact area increased, the sliding resistance between the meshing chain and the chain guide plate can be avoided to reduce the loss of drive energy and drive the chain smoothly. There was the problem of making it even more difficult.
Further, in Patent Document 2 described above, the pair of driving wheels disposed on both sides of the chain are synchronized with each other by a synchronous gear to drive the pair of winding wheels. There is a problem that it is difficult to effectively use the space.
In general, an endless chain is provided with a tension applying mechanism for applying tension to the entire chain via the driven sprocket and applying tension to the chain as required. By providing it, the chain was prevented from loosening.
However, since the meshing chain has an end portion and reciprocates, it is difficult to apply tension with the tension applying device, and it is necessary to provide chain guides on both sides of the pair of meshing chains in the chain bending region of the meshing chain. there were.
Further, in the case where the guide edge described in Patent Document 5 is provided on the side where the chain of the driving sprocket is disengaged to facilitate the disengagement of the meshing chain engaged with the driving sprocket with the driving sprocket, As with the winding device disclosed in Patent Document 2, there is a problem that the device configuration is complicated and it is difficult to effectively use the space around the drive sprocket drive wheel.

  Therefore, the technical problem to be solved by the present invention, that is, the object of the present invention is to avoid loss of drive energy, drive the chain smoothly, and effectively use the space around the drive sprocket. It is an object of the present invention to provide a meshing chain type advance / retreat operation device.

  First, the invention according to claim 1 is a meshing chain type advance / retreat operation device including a pair of meshing chains that are rigidly integrated with each other in a state where they are meshed with each other and arranged so as to be bifurcated. A pair of chain take-up drive drums that wind up and accommodate the pair of meshing chains along the circumferential direction are spaced apart from each other, and the drive sprocket engages with one of the pair of meshing chains. Is provided at a side position of the one engagement chain, and a chain disengagement portion in which the pair of engagement chains are disengaged from each other from a chain stiffening portion in which the pair of engagement chains are engaged with each other. A chain guide portion for guiding the other meshing chain from a side position of the other meshing chain of the pair of meshing chains But by being arranged on the opposite side of the arrangement side that is arranged the drive sprocket when viewed from the pair of engagement chains, it is obtained by solving the problems described above.

  The invention according to claim 2 is the meshing chain type advance / retreat operation device according to claim 1, wherein the drive sprocket, the chain guide member, and the pair of chain take-up drive drums form a chain non-sliding region. By being spaced apart from each other, the problems described above are further solved.

  The invention according to claim 3 is the meshing chain type advance / retreat operation device according to claim 1 or 2, wherein the drive sprocket and the chain guide member are arranged in a state of facing each other in the chain bending region. Thus, the above-described problems are further solved.

  The invention according to claim 4 is the meshing chain type advance / retreat operation device according to claim 1 or 2, wherein the drive sprocket engages with the one meshing chain only at the chain stiffening portion. Thus, the above-described problems are further solved.

  The invention according to claim 5 is the meshing chain type advance / retreat operation device according to any one of claims 1 to 4, and is formed in a spiral shape along the rotation axis of the chain winding drive drum. Further, the above-described problem is further solved by forming the chain winding groove along the peripheral surface of the chain winding drive drum.

  The interlocking chain type advance / retreat operation device according to claim 1 of the present invention is provided with a pair of interlocking chains which are stiffened integrally in a state where they are meshed with each other and arranged opposite to each other, and are disengaged from each other and can be branched. In addition to being able to drive a driven body such as a table in accordance with the advancing / retreating operation of the pair of meshing chains, it is possible to achieve special effects corresponding to the following unique configurations.

That is, in the meshing chain type advance / retreat operation device according to the first aspect of the present invention, a pair of chain take-up driving drums that wind up and accommodate the pair of meshing chains along the circumferential direction are spaced apart from each other, and the pair of meshing chains are arranged. Drive sprockets engaged with one of the meshing chains are provided at side positions of the one meshing chain, and the pair of meshing chains are joined together so that the pair of the sprockets are integrated with each other. A chain guide member that guides the other meshing chain from a side position of the other meshing chain of the pair of meshing chains over a portion where the meshing meshes are disengaged from each other is seen from the pair of meshing chains. A pair of meshing chains are arranged on the opposite side of the arrangement side where the drive sprocket is arranged. The direction in which the drive sprocket is not installed on both sides, that is, the configuration in which one drive sprocket is arranged, drives a pair of meshing chains and uses a spring or other elastic body to wind the chain take-up drive drum at all times. That is, in a state in which tension is applied to the meshing chain by urging in the circumferential direction, the chain disengagement portion is wound around the chain winding drive drum to avoid sliding friction between the meshing chain and the chain winding drive drum, In addition, the guide should be installed in the crotch region of the pair of meshing chains while guiding the meshing chain by winding the meshing chain around the chain take-up drive drum while eliminating tension, vibration and noise of the meshing chain with tension applied to the part where the chain is disengaged. The guide member and chain are disengaged with the member removed. In order to avoid sliding friction between minutes, the loss of drive energy is avoided, the meshing chain is driven smoothly, and the paired meshing chains are set at low engagement positions so that the driven body is at its lowest lowered position. Efficient space in the area surrounding the drive sprocket by avoiding restrictions on the parts installation space that must be ensured between the drive sprocket and the meshing chain with a low profile and increasing the flexibility of the chain winding drive drum installation position It can be realized.
In addition, the drive sprocket is used to drive the meshing chain and the chain take-up drive drum is always urged in the chain take-up direction to constantly apply tension to the meshing chain, so some guides in the chain bending area are omitted. In addition, it is possible to provide a chain non-sliding region.
In addition, since tension is applied to the meshing chain from the chain take-up drive drum, the meshing chain tends to occur when the meshing chain is driven along the chain disengagement direction when the pair of meshing chains are meshed with each other. Pulsation can be greatly reduced.
Furthermore, it is possible to smoothly disengage the meshing chain and the drive sprocket without providing a guide edge that assists in disengagement between the meshing chain and the driving sprocket.

  Further, the meshing chain type advance / retreat operation device according to claim 2 has, in addition to the effect exerted by the meshing chain type advance / retreat operation device according to claim 1, the drive sprocket, the chain guide member, and the pair of chain winding drives. Occurs when the chain is driven because the drum is spaced apart from the non-sliding region of the chain so that no sliding friction occurs between the meshing chain and other members in the non-sliding region of the chain. In addition, the vibration and noise of the meshing chain can be further reduced, the driving energy loss caused by the sliding friction can be further avoided, and smooth chain driving can be realized.

  The meshing chain type advance / retreat operation device according to the third aspect of the present invention has the effect that the meshing chain type advancement / retraction operation device according to the first or second aspect exhibits, the drive sprocket and the chain guide member are By being arranged in a state of being opposed to each other in the region, in order to guide the pair of meshing chains from the chain stiffening part to the chain unengaged part, the chain take-up driving drum is driven while the meshing chain is pulled and driven. It is possible to drive the meshing chain more smoothly by restricting the traveling path of the meshing chain from the time when the pair of meshing chains are meshed with each other until the meshing chain is wound and stored on the chain winding drive drum.

  In addition to the effect produced by the meshing chain type advance / retreat operation device according to claim 1 or 2, the meshing chain type advancement / retraction operation device according to claim 4 is configured so that the drive sprocket has the chain stiffening portion. By engaging only with the one meshing chain, the chain state when the chain is disengaged is not limited to a chain bending state that matches the number of sprocket teeth of the drive sprocket, that is, the pitch of the sprocket teeth. The degree of freedom of the space available in the vicinity of the disengagement position of the engagement chain can be increased.

  Further, the meshing chain type advance / retreat operation device according to claim 5 has the effect of the meshing chain type advance / retreat operation device according to any one of claims 1 to 4 in addition to the effect of the chain winding drive drum. A chain take-up groove formed in a spiral shape along the rotation axis is formed along the peripheral surface of the chain take-up drive drum, so that the meshed chain taken up by the chain take-up drive drum is chained. Since they are not brought into contact with each other along the rotation axis of the winding drive drum, it is possible to surely realize smooth chain driving by eliminating the catching between the wound meshing chains.

The perspective view of the meshing chain type advance / retreat operation apparatus which concerns on the Example of this invention. The assembly perspective view which shows the decomposition | disassembly assembly state of a meshing chain. The front view of the meshing chain type advance / retreat operation apparatus which concerns on the Example of this invention. The enlarged view of the meshing chain type advance / retreat operation apparatus which concerns on the Example of this invention. Sectional drawing which shows the winding-up state of a meshing chain. Sectional drawing which shows the other winding state of a meshing chain.

  The meshing chain type advance / retreat operation device of the present invention includes a pair of meshing chains that are integrally rigid while being meshed with each other and arranged opposite to each other, and are capable of being separated from each other so that they can be branched. A pair of chain take-up drive drums that are respectively wound up and accommodated are spaced apart, and a drive sprocket that engages one of the pair of meshing chains is provided at a side position of the one meshing chain. From the side position of the other meshing chain of the pair of meshing chains from the chain stiffening portion where the pair of meshing chains are meshed with each other to the chain meshing off portion where the pair of meshing chains are meshed with each other The chain guide member that guides the other meshing chain arranges the drive sprocket as viewed from the pair of meshing chains. As long as it is arranged on the opposite side of the arrangement side that, aspects of its specific implementation, may any be any one.

The specific structure of the meshing chain may be any shape as long as the plates facing each other are meshed and integrated, and are disengaged and branched.
For example, a plurality of plates are connected in the longitudinal direction of the chain with a connecting pin loosely fitted to a bush provided between a pair of plates facing each other along the width direction of the chain to form a meshing chain and for driving The meshing chain may be driven by engaging the sprocket teeth of the sprocket with the bush.
Further, the meshing chain may be wound with the entire meshing chain stored in the chain winding groove formed on the circumferential surface of the chain winding drive drum, or a plurality of plates may be partially used as the chain winding groove. By retracting the meshing chain without sliding the tip of the connecting pin on the peripheral surface of the chain take-up driving drum while bringing the tip of the connecting pin protruding from the plate surface into contact with the edge of the chain take-up groove, Since the gap is formed between the plate end surface and the groove bottom surface of the chain winding groove, the sliding contact resistance between the plate and the chain winding groove may be eliminated to avoid wear of the plate end surface.
In addition, a guide surface that includes the drive shaft of the drive sprocket and guides the disengaged portion of the chain to a virtual plane parallel to the device installation surface is formed on the chain guide member so that the chain guide member and the drive are driven from both sides of the pair of meshing chains. The pair of meshing chains may be more reliably meshed by guiding the pair of meshing chains with the sprocket for use.

Further, the meshing chain type advance / retreat operation device of the present invention has no problem in the advance / retreat operation even if the installation surface is a floor surface in a stationary installation form or a ceiling surface in a suspended installation form. Even if it is a vertical wall surface in a cantilever support form, there is no problem in the above-described advance / retreat operation.
The chain guide member may be a sliding guide for the chain meshing behavior or may be a driven sprocket.
[Example]

Hereinafter, an interlocking chain type advance / retreat operation device 100 according to an embodiment of the present invention will be described with reference to FIGS. 1 to 6.
Here, FIG. 1 is a perspective view of the meshing chain type advance / retreat operation device 100 according to the embodiment of the present invention, FIG. 2 is an assembly perspective view showing an exploded assembly state of the meshing chain 110, and FIG. 4 is a front view of a meshing chain type advance / retreat operation device 100 according to an embodiment of the present invention, FIG. 4 is an enlarged view of the meshing chain type advance / retreat operation device 100 according to an embodiment of the present invention, and FIG. FIG. 6 is a cross-sectional view showing another winding state of the meshing chain 110. FIG.

As shown in FIGS. 1 to 3, the meshing chain type advance / retreat operation device 100 according to this embodiment is rigidly integrated with each other in a state of being meshed with each other and opposed to each other, and is a pair of arms that can be separated from each other and branched. It is provided with meshing chains 110, 110, and is configured to move a driven body T such as a table mounted on an installation surface G and carrying a transported object (not shown) such as a heavy object in parallel with the installation surface G. is there.
Further, the meshing chain 110 is formed of a plurality of plates 111A and 111B that engage the plate end surface teeth 111S with the sprocket teeth of the driving sprocket 130 in a state where they are connected along the longitudinal direction of the chain by a pair of front and rear connecting pins 112, respectively. Has been.

Next, a specific form of the configuration most characteristic of the above-described meshing chain type advance / retreat operation device 100 of the present embodiment will be described in detail with reference to FIGS.
In the following, a case where the pair of chain winding drive drums 120 and 120 are provided on both sides of the crotch region R1 of the pair of meshing chains 110 and 110 will be described. , 120 is not limited to the present embodiment.
As shown in FIG. 1 to FIG. 4, the meshing chain type advance / retreat operation device 100 of this embodiment winds a pair of meshing chains 110, 110 along the circumferential direction and accommodates a pair of chain winding drive drums 120. , 120 are spaced apart from each other, and a drive sprocket 130 that engages one of the pair of meshing chains 110, 110 is provided at a side position of the one meshing chain 110, and the pair of meshing chains 110, From the chain stiffening portion 110B in which the 110 meshes with each other to the chain disengagement portion 110A in which the pair of meshing chains 110, 110 are meshed with each other, the other meshing chain 110 of the pair of meshing chains 110, 110 Chain guide member 1 for guiding the other meshing chain 110 from the side position Since 0 is arranged on the opposite side of the arrangement side where the driving sprocket 130 is arranged when viewed from the pair of meshing chains 110, 110, the driving sprocket 130 is not installed on both sides of the pair of meshing chains 110, 110, respectively. Configuration, that is, a configuration in which one driving sprocket 130 is disposed, drives the pair of meshing chains 110 and 110, and uses a resilient body such as a spring to always wind the chain winding drive drum 120 around the meshing chain 110, that is, circumferential direction The chain disengagement portions 110A and 110A are wound around the chain take-up drive drum 120 in a state where the mesh chain 110 is urged to apply tension, and the sliding friction between the engage chain 110 and the chain take-up drive drum 120 occurs. And the chain disengagement part 1 The engagement chain 110 should be guided to the chain take-up drive drum 120 with no tension, vibration and noise of the engagement chain 110 in a state where tension is applied to 0A, and installed in the crotch region R1 of the pair of engagement chains 110, 110. In order to avoid sliding friction between the guide member and the chain disengagement portion 110A without the guide member, a loss of drive energy is avoided and the engagement chain 110 is driven smoothly, and a pair of engagement chains 110 and 110 are set low and the lowest position of the driven body T is set low, avoiding the restriction of the parts installation space to be secured between the driving sprocket 130 and the meshing chain 110 and the chain. Sprocket for driving by expanding the degree of freedom of installation position of winding drive drum 120 Effective use of the space in the peripheral area is realized.
In addition, since the meshing chain 110 is driven by the drive sprocket 130 and the chain winding drive drum 120 is always urged in the chain winding direction to always apply tension to the meshing chain 110, the meshing chain type advance / retreat operation is performed. In the apparatus 100, a part of the guide in the chain bending region R2 is omitted, and a chain non-sliding region R3 is provided.
Further, since tension is applied to the meshing chain 110 from the chain take-up drive drum 120, the meshing chain type advance / retreat operation device 100 moves in the direction in which the chain is disengaged when the pair of meshing chains 110, 110 are meshed with each other. The pulsation of the meshing chain 110 that tends to occur when the meshing chain 110 is driven along is greatly reduced.
Further, the meshing chain type advance / retreat operation device 100 smoothly meshes the meshing chain 110 and the driving sprocket 130 without providing a guide edge that assists the meshing chain 110 and the driving sprocket 130 to disengage. ing.

Further, in the meshing chain type advance / retreat operation device 100, the drive sprocket 130 and the chain guide member 140 and the pair of chain winding drive drums 120 are spaced apart from each other across the chain non-sliding region R3. Since no sliding friction is generated between the meshing chain 110 and other members in the chain non-sliding region R3, the vibration and noise of the meshing chain generated when the chain is driven are further reduced and the sliding friction is caused. Driving energy loss is further avoided and smooth chain driving is realized.
Further, the meshing chain type advance / retreat operation device 100 is provided along the chain width direction W by the chain displacement prevention plates 150 and 160 being provided on both sides of the pair of meshing chains 110 and 110 along the chain width direction W. In order to avoid the displacement of the meshing chain 110, the displacement of the driven body T is avoided and smooth meshing of the pair of meshing chains 110, 110 is realized.

  Further, the meshing chain type advance / retreat operation device 100 is configured such that the drive sprocket 130 and the chain guide member 140 are disposed in a state where they are opposed to each other in the chain bending region R2, so that the chain disengagement portion from the chain stiffening portion 110B. In order to guide the pair of meshing chains 110, 110 over 110A, the chain winding drive drum 120 is driven while the meshing chain 110 is pulled, and the pair of meshing chains 110, 110 are meshed with each other, and then the chain winding drive is performed. Until the meshing chain 110 is wound around and stored in the drum 120, the traveling path of the meshing chain 110 is regulated to drive the meshing chain 110 more smoothly.

In the meshing chain type advance / retreat operation device 100, the drive sprocket 130 may be engaged with one meshing chain 110 only at the chain stiffening portion 110B.
Thus, the meshing chain type advance / retreat operation device 100 does not limit the chain state when the chain is disengaged to a chain bending state that matches the number of sprocket teeth of the driving sprocket 130, that is, the pitch of the sprocket teeth. The degree of freedom of the space that can be used around the disengagement positions 110 and 110 is increased.

  1, 3, 4, and 5, the meshing chain type advance / retreat operation device 100 includes a chain winding groove formed in a spiral shape along the rotation shaft 120 </ b> A of the chain winding drive drum 120. 121 is formed along the circumferential surface of the chain take-up drive drum 120, so that the meshing chain 110 taken up by the chain take-up drive drum 120 is moved along the rotating shaft 120A of the chain take-up drive drum 120. Since they are not brought into contact with each other, the chain between the wound meshing chains 110 is not caught and smooth chain driving is reliably realized.

  As shown in FIGS. 1, 3, 4, and 6, the meshing chain type advance / retreat operation device 100 partially stores the plurality of plates 111A, 111B in the chain take-up groove 121A and protrudes from the plate surface. The end of the connecting pin 112 is brought into contact with the edge of the chain take-up groove 121A, and the meshing chain 110 is wound around the peripheral surface of the chain take-up driving drum 120 without sliding the end of the connecting pin 112. And the groove bottom surface of the chain winding groove 121A, a sliding contact resistance between the plates 111A and 111B and the chain winding groove 121A is eliminated, and wear of the plate end surface is avoided. .

The chain winding drive drum 120 may be driven by a spring, or may be rotationally driven in the chain winding direction by using an electric means such as a torsion coil spring or a motor whose rotation angle is suppressed to approximately 360 ° or less. Good.
Further, the drive means for driving the chain take-up drive drum 120 is not limited to the drive means such as the spring spring exemplified in this embodiment, and any drive means can be used as long as it can be rotationally driven.

  The meshing chain type advance / retreat operation device 100 of the present embodiment thus obtained includes a pair of chain winding drive drums 120, 120 that wind up and accommodate the pair of meshing chains 110, 110 along the circumferential direction. A drive sprocket 130 that is spaced apart and engages one meshing chain 110 of the pair of meshing chains 110, 110 is provided at a side position of the one meshing chain 110, and the pair of meshing chains 110, 110 are mutually connected. The side position of the other meshing chain 110 of the pair of meshing chains 110, 110 from the chain stiffening portion 110B meshed with each other to the chain meshing disengagement portion 110A that meshes the pair of meshing chains 110, 110 with each other. A chain guide member 140 for guiding the other meshing chain 110 By disposing on the opposite side of the arrangement side where the driving sprocket 130 is arranged as viewed from the pair of meshing chains 110, 110, the loss of driving energy is avoided and the meshing chain 110 is driven smoothly, and for driving. To avoid the limitation of the space for installing the parts to be secured between the sprocket 130 and the meshing chain 110 and to increase the degree of freedom of the installation position of the chain take-up drive drum 120 to effectively use the space around the drive sprocket. The effect is enormous and can be realized.

DESCRIPTION OF SYMBOLS 100 ... Engagement chain type advance / retreat operation device 110 ... Engagement chain 111A, 111B ... Plate 111S ... Plate end surface tooth 112 ... Connection pin 120 ... Chain winding drive drum 120A ... Chain Rotating shaft 121, 121A of the winding drive drum ... Chain winding groove 130 ... Drive sprocket 140 ... Chain guide member 150, 160 ... Chain slip prevention plate G ... Installation surface R1 ... · Crotch region of paired meshing chain R2 ··· Chain bending region of meshing chain R3 · · · Chain non-sliding region T · · · Driven body · · · Chain width direction

Claims (5)

A meshing chain type advancing / retreating operation device comprising a pair of meshing chains that are mutually rigid and integrally stiffened in a state where they are meshed with each other and are disengaged from each other and can be branched,
A pair of chain take-up drive drums that wind up and house the pair of meshing chains along the circumferential direction are spaced apart,
A driving sprocket that engages one of the pair of meshing chains is provided at a side position of the one meshing chain,
A side position of the other meshing chain of the pair of meshing chains from a chain stiffening portion in which the pair of meshing chains are meshed with each other to a chain unseated portion in which the pair of meshing chains are meshed with each other The chain guide member for guiding the other meshing chain is disposed on the side opposite to the side where the drive sprocket is disposed as viewed from the pair of meshing chains.   The meshing chain type advance / retreat operation according to claim 1, wherein the drive sprocket and the chain guide member and the pair of chain winding drive drums are spaced apart from each other with a chain non-sliding region therebetween. apparatus.   The meshing chain type advance / retreat operation device according to claim 1 or 2, wherein the driving sprocket and the chain guide member are arranged in a state of being opposed to each other in a chain bending region.   The engagement chain type advance / retreat operation device according to claim 1 or 2, wherein the drive sprocket is engaged with the one engagement chain only at the chain stiffening portion.   The chain winding groove formed in a spiral shape along the rotation axis of the chain winding drive drum is formed along the peripheral surface of the chain winding drive drum. 5. The interlocking chain type advance / retreat operation device according to any one of items 4 to 5.

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