JP2013122271A - Engagement chain unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an engagement chain unit capable of avoiding an increased chain manufacturing and maintenance cost, an increased number of assembly steps, decreased assembly precision, increased energy loss during driving, limitations to the part installation space, twisting of the engagement chain, falling out of connecting pins from external tooth plates, falling out of bushings from internal tooth plates, and tilting of connecting pins with respect to the external tooth plates, and further capable of avoiding a decrease in the durability of the chain, and rattling of the external tooth plates and the like.SOLUTION: In an engagement chain unit 110, a pair of engagement chains 111, 111 are formed so as to describe a square shape SQ on a chain-stiffening portion projection region RG, comprising a connecting pin projection regions R1 of a chain-stiffening portion 110G, and the plate projection regions of hook-shaped internal teeth plates and hook-shaped external teeth plates, that is, plate projection regions R2 formed with adjacent hook-shaped internal teeth plates and hook-shaped external teeth plates.

Description

  INDUSTRIAL APPLICABILITY The present invention is incorporated in a drive device that moves a driven body forward and backward with respect to an installation surface 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. The present invention relates to a meshing chain unit.

Conventionally, as a meshing chain incorporated in a drive device, there is a chain in which a plurality of inner link units are arranged in parallel (for example, see Patent Document 1).
In some cases, the strength of the entire chain is changed by changing the number and size of the meshing chains that mesh with each other to form an integral rigid body.

Japanese Patent Laying-Open No. 2009-113872 (see paragraph [0019], FIG. 4)

However, if the buckling strength or chain strength of the meshing chain is increased by increasing the number of meshing chain rows or increasing the chain size, the number of parts of the meshing chain will increase. There is a problem that the number of chain assembly steps increases and the chain assembly accuracy decreases, and the driving force of the meshing chain is increased in accordance with the increase of the chain weight to increase the energy loss when the meshing chain is driven. there were.
In addition, when the drive motor is increased in size to increase the driving force of the meshing chain in accordance with the increase in the chain weight, the installation space for the drive motor is increased. Therefore, the drive device provided with the meshing chain is increased in size. As a result, there is a problem in that other parts installation space in the drive device is limited.

Further, when a plurality of meshing chains are provided, the number of meshing positions between the internal tooth plates and the external tooth plates increases as the number of lines increases, so the internal tooth plates and the external tooth plates at the multiple meshing positions. There is a problem in that the forces acting on each other are biased and the meshing chain is twisted.
In addition, when trying to increase the buckling strength of the meshing chain by increasing the pin spacing of the coupling pins provided one after the other in the longitudinal direction of the chain, the coupling pin with respect to the bushing or external tooth plate according to the twisting of the meshing chain Since the force is applied to the press-fitted part, the bush and the connecting pin are inclined with respect to the inner tooth plate and the outer tooth plate, and the connecting pin comes out of the press-fitting fitting part with the outer tooth plate. There has been a problem of causing a problem of detaching from the press-fitting portion with the tooth plate.
In addition, when an intermediate tooth plate is arranged between adjacent chain rows in a state where a plurality of meshing chains are provided, due to plate tolerances and chain assembly errors, the intermediate tooth plate has more Since the size may become long, there is a problem that the outer tooth plate and the inner tooth plate on both sides of the intermediate tooth plate are rattled.

In addition, when multiple meshing chains are connected in parallel, the thrust of the entire meshing chain according to the contact stress between the bushing or roller provided between the internal teeth plates constituting the meshing chain and the drive sprocket is the number of meshing chain rows. For example, even if the entire chain requires a thrust of 1.5 times the thrust acting on one row of meshing chains, the meshing chain is increased. There is a problem in that two rows are connected and thrust exceeding the thrust necessary for driving the chain is applied to the meshing chain, which increases the number of parts of the meshing chain and increases the part cost.
In addition, when the number of meshing chain rows is increased in the chain width direction to avoid buckling of the meshing chains, an intermediate tooth plate is press-fitted between the meshing chain rows to increase the chain strength. Similar to the case where the thrust is applied to the meshing chain, there is a problem that the number of parts of the meshing chain is increased and the cost of the chain parts is increased.
Further, the driving force applied to the bushing or roller is increased without increasing the contact area between the bushing provided on the single-row meshing chain or the roller inserted into the bushing and the driving sprocket, and the chain thrust of the entire meshing chain is increased. If it is increased, the contact pressure between the sprocket teeth of the drive sprocket and the bushing or roller will increase, so that the bushing or roller will be easily worn and damaged, reducing the durability of the meshing chain and increasing the bushing. Or, there is a problem that the maintenance cost of the meshing chain is increased because the parts need to be replaced with the wear of the roller.

  Therefore, the technical problem to be solved by the present invention, that is, the object of the present invention is to increase the chain manufacturing cost accompanying the increase in the number of parts, increase the chain maintenance cost, increase the number of chain assembly steps, and improve the chain assembly accuracy. Lowering, increasing energy loss when driving the meshing chain, and limiting the space for installing parts, twisting the meshing chain, disconnecting the connecting pin to the external tooth plate, disconnecting the bushing from the internal tooth plate, and connecting pin to the external tooth plate It is an object of the present invention to provide a meshing chain that avoids the inclination of the chain and prevents the chain durability from being lowered and the ratchet of the external tooth plate and the internal tooth plate from being loosened.

  First, the meshing chain unit according to the first aspect of the present invention includes an inner link unit formed by press-fitting a pair of front and rear bushes to a pair of left and right hook-shaped inner teeth plates that are spaced apart from each other, and the inner link unit. A plurality of meshed chains connected in the longitudinal direction of the chain are opposed to each other by a pair of front and rear connecting pins that press-fit a pair of front and rear pin holes of the hook-shaped outer tooth plate to the hook-shaped outer tooth plate. A pair of arrangements, the chain-shaped stiffening in a state in which the pair of meshing chains are meshed with each other and the hook-shaped external tooth plates facing each other are integrated with each other in the chain stiffening direction. Forming a portion, the hook-shaped inner tooth plates and the hook-shaped outer tooth plates are disengaged from each other and branched to each other. When the chain stiffening portion is projected onto a virtual plane that is orthogonal to the chain stiffening direction and includes the pin axis of the connecting pin, the connecting pin projection region of the chain stiffening portion, the hook-shaped internal tooth plate projection The above-described problems are solved by forming a square in the chain rigidized partial projection region including the region and the hook-shaped external tooth plate projection region.

  The invention according to claim 2 is the meshing chain unit according to claim 1, wherein at least one of the hook-shaped inner tooth plate, the hook-shaped outer tooth plate, and the connecting pin connects the pair of meshing chains to each other. The above-mentioned problem is further solved by elastically deforming in a state in which play between the parts constituting the pair of meshing chains is eliminated when the chain stiffening portion is formed by meshing with each other.

  The meshing chain unit according to claim 1 of the present invention includes an inner link unit formed by press-fitting a pair of front and rear bushes to a pair of left and right hook-shaped inner teeth plates that are spaced apart from each other, and an outer side of the inner link unit. A pair of meshing chains connected in the longitudinal direction of the chain by a pair of front and rear connecting pins that press-fit and fit the hook-shaped external tooth plate to the pair of front and rear pin holes of the hook-shaped external tooth plate. The pair of meshing chains are engaged with each other with the hook-shaped inner teeth plates facing each other and the hook-shaped outer teeth plates facing each other, and the chain-stiffening portion is integrated in the chain-stiffening direction. By forming and engaging the hook-shaped inner tooth plates and the hook-shaped outer tooth plates, respectively, and branching to each other, the meshing chain Not only can perform a stiffening and branching operation, it is possible to obtain the significant effect that corresponds to the specific configuration as follows.

  That is, the meshing chain unit according to claim 1 is configured such that when the pair of meshing chains project the chain stiffening portion onto a virtual plane that is orthogonal to the chain stiffening direction and includes the pin axis of the connecting pin. The chain stiffening portion projection area of the chain stiffening portion is formed so that a square can be drawn on the chain stiffening portion projection region including the hook-shaped internal tooth plate projection region and the hook-shaped external tooth plate projection region. The mesh-direction supporting surface that secures the rigidity of the chain stiffening portion along the in-plane direction parallel to the respective plates of the tooth plate and the hook-shaped external tooth plate is constituted by the hook-shaped internal tooth plate and the hook-shaped external tooth plate. The rigidity of the chain stiffening part is increased along the chain width direction, which is the opposite direction of the pair of left and right hook-shaped internal teeth plates. Since the supporting surface in the width direction is constituted by the connecting pins, the in-plane direction parallel to the hook-like inner tooth plate and the hook-like outer tooth plate and the chain width direction in the state where the meshing chain is constituted by a single row. Along the chain, the rigidity of the chain stiffening section is ensured and the chain manufacturing cost increases, the chain maintenance cost increases, the number of chain assembly processes increases, the chain assembly accuracy decreases, the mesh chain drive increases. This avoids an increase in energy loss and restrictions on the installation space of the parts, and avoids twisting of the meshing chain, disconnection of the connection pin with respect to the external tooth plate, disconnection of the bush with respect to the internal tooth plate, and inclination of the connection pin with respect to the external tooth plate. Moreover, it is possible to avoid deterioration of chain durability and rattling of the external tooth plate and the internal tooth plate.

  And, in addition to the effect produced by the meshing chain unit according to claim 1, the meshing chain unit according to claim 2 has at least one of the hook-shaped inner tooth plate, the hook-shaped outer tooth plate, and the connecting pin, When the pair of meshing chains are meshed with each other to form a chain stiffening portion, the meshing operation of the pair of meshing chains is performed by elastically deforming in a state in which play between the components constituting the pair of meshing chains is eliminated. A pair of hook-shaped inner teeth plates and hook-shaped outer teeth plates are engaged with each other in a state in which an urging force generated due to elastic deformation of at least one of the hook-shaped inner tooth plate, the hook-shaped outer tooth plate and the connecting pin is applied. To make the chain stiffening part by stiffening the meshing chain of the unitary, the meshing chain is composed of a single row In this state, the rigidity of the chain stiffening part is increased to increase the chain manufacturing cost due to the increase in the number of parts, etc., increase the chain maintenance cost, increase the number of chain assembly processes, decrease the chain assembly accuracy, and reduce the energy loss when driving the meshing chain. It avoids the increase in the space for installation and parts, and avoids twisting of the meshing chain, disconnection of the connecting pin to the external tooth plate, disconnection of the bush to the internal tooth plate, and inclination of the connecting pin to the external tooth plate, and durability of the chain And the backlash of the external tooth plate and the internal tooth plate can be further avoided.

The perspective view of the meshing chain type advance / retreat operation device incorporating the meshing chain unit according to the present invention. The partial perspective view of the meshing chain type advance / retreat operation apparatus shown in FIG. FIG. 2 is a partially enlarged view of the meshing chain type advance / retreat operation device shown in FIG. 1. The disassembled perspective view of the meshing chain unit which concerns on this invention. Sectional drawing of the meshing chain which comprises the meshing chain unit which concerns on this invention. Sectional drawing which expanded the chain rigidity part of the meshing chain unit which concerns on this invention. Explanatory drawing of the square drawn in the chain rigidization partial area | region. Explanatory drawing of the square drawn by the modified example of the chain rigidity part area | region. Explanatory drawing of the square drawn in the other modification of a chain rigidification partial area | region. Explanatory drawing of the square drawn in the other modification of a chain rigidification partial area | region.

The meshing chain unit of the present invention includes an inner link unit formed by press-fitting a pair of front and rear bushes on a pair of left and right hook-shaped inner teeth plates that are spaced apart from each other, and a hook shape that is disposed outside the inner link unit. A pair of meshing chains that are connected in the longitudinal direction of the chain by a pair of front and rear connecting pins that press fit the outer tooth plate into a pair of front and rear pin holes of the hook-shaped outer tooth plate are arranged opposite to each other. The chain-stiffened part is formed in a state where the hook-shaped inner tooth plates facing each other and the hook-shaped outer tooth plates facing each other are meshed and integrated in the chain stiffening direction and hook-shaped. The inner tooth plates and the hook-like outer tooth plates are disengaged from each other and branched to each other, and a pair of meshing chains are connected to the chain rigid When the chain rigidized portion is projected onto a virtual plane that is orthogonal to the forming direction and includes the pin axis of the connecting pin, the connecting pin projecting region, the hook-shaped internal tooth plate projecting region, and the hook-shaped external tooth plate projecting region of the chain stiffening portion The surface is parallel to the hook-shaped inner tooth plate and the hook-shaped outer tooth plate in a state where the meshing chain is formed in a single row by being formed so that a square can be drawn in the chain rigidized partial projection region consisting of Increase the chain manufacturing cost, increase chain maintenance cost, increase the number of chain assembly processes, increase the number of chain assembly processes, increase the number of parts by securing the rigidity of the chain stiffening portion isotropically along the inward and chain width directions Reduces accuracy, increases energy loss when driving the meshing chain, avoids restrictions on parts installation space, and meshes It avoids twisting of the chain, disconnection of the connecting pin with respect to the external tooth plate, disconnection of the bush with respect to the internal tooth plate, and inclination of the connecting pin with respect to the external tooth plate, while also reducing the chain durability and rattling of the external tooth plate and the internal tooth plate. As long as the above is avoided, any specific embodiment may be used.
In addition, the chain-stiffened partial projection region is a mouth shape that contributes to chain stiffening among the well-shaped cross-sectional region composed of the connecting pin projection region, the hook-shaped internal tooth plate projection region, and the hook-shaped external tooth plate projection region of the chain stiffening portion. Means a cross-sectional area.
In addition, the “meshing direction support surface” and the “width direction support surface” in the meshing chain unit of the present invention are a virtual plane that is orthogonal to the chain stiffening direction and includes the pin axis of the connecting pin, A virtual plate cutting surface and a pin cutting surface formed by cutting the tooth plate and the connection pin are defined, and a connection pin projection region, a hook-like internal tooth plate projection region, and a hook-like external tooth plate projection region are formed, respectively. .
In addition, the meshing chain unit of the present invention may be driven by a driving sprocket provided at a rigid position where a pair of meshing chains are integrally meshed, or disposed in a branch region where the pair of meshing chains branch from each other. It may be driven by another driving sprocket.
Further, the meshing chain unit of the present invention may be driven by a driving sprocket that meshes with one of a pair of meshing chains that mesh with each other to be rigid, or is driven by two driving sprockets that mesh with the pair of meshing chains, respectively. May be.
Further, the interlocking chain type advance / retreat operation device equipped with the interlocking chain unit of the present invention does not move forward or backward regardless of whether the installation surface is a floor surface in a stationary installation form or a ceiling surface in a suspended installation form. There is no hindrance, and there is no hindrance to the advancing and retreating operation described above even if the wall surface is a cantilevered support.

Hereinafter, a meshing chain unit 110 according to an embodiment of the present invention will be described with reference to FIGS.
Here, FIG. 1 is a perspective view of a meshing chain type advance / retreat operation device incorporating the meshing chain unit according to the present invention, and FIG. 2 is a partial perspective view of the meshing chain type advance / retreat operation device shown in FIG. 3 is a partially enlarged view of the meshing chain type advance / retreat operation device shown in FIG. 1, FIG. 4 is an exploded perspective view of the meshing chain unit according to the present invention, and FIG. FIG. 6 is a cross-sectional view of the meshing chain constituting the meshing chain unit, FIG. 6 is an enlarged cross-sectional view of the chain stiffening portion of the meshing chain unit according to the present invention, and FIG. FIG. 8 is an explanatory diagram of a square drawn in a variation of the chain stiffening partial region, and FIG. 9 is a depiction of another variation of the chain stiffening partial region. Is an explanatory diagram of a square 0 is an explanatory view of a drawn square to another modification of the rigid chain moieties region.
6, the solid line that defines the cross section of the member such as the external tooth plate shown in FIG. 6 and the dotted line that defines the region such as the plate projection region R <b> 2 and the alternate long and short dash line overlap and coincide with each other and The portions of the diagram where the lines cannot be distinguished are shown shifted from each other for the sake of convenience of explanation.

  First, as shown in FIG. 1, the meshing chain type advance / retreat operation device 100 incorporating the meshing chain unit 110 according to the present embodiment is installed in a stationary state on an installation surface such as a work floor surface, and a heavy object or the like is installed. A driven body 120 such as a lifting table on which a driven object (not shown) is mounted is moved up and down in parallel with the installation surface G.

  As shown in FIGS. 1 and 2, the meshing chain type advance / retreat operation device 100 includes a base plate 130 installed on the installation surface G on which the driven body 120 moves up and down in parallel, and a parallel to the base plate 130. A motor is connected to a driving sprocket 140 that rotates forward and backward so that one of a pair of meshing chains 111, 111 described later can be moved forward and backward by rotating forward and backward around the installed rotating shaft 141, and a driven sprocket 153 that rotates the driving sprocket 140. A drive motor 150 that transmits power via the side sprocket 141 and the power transmission chain 151 and a chain that is disposed in the crotch region at the deflection position of the pair of meshing chains 111 and 111 and guides the pair of meshing chains 111 and 111 to each other Driven by guide plate 170 and drive sprocket 140 The chain guide 180 for positioning and meshing the other meshing chain 111 with the other meshing chain 111 and the peripheral area of the lowest lowered position of the driven body 120, that is, outside the area under the projection umbrella of the driven body 120 And a chain storage means 160 comprising a winding-type chain storage box 161 that winds and stores one of the pair of meshing chains 111 and 111 that are separated from each other and branched. A driven body 120 on which a driven object such as a workpiece is mounted is directly supported by a pair of meshing chains 111 and 111 to be raised and lowered.

The pair of meshing chains 111, 111 described above are arranged in two sets on the left and right sides with respect to the driven body 120, and are in a so-called two-protruding state.
As a result, when the driven object is mounted in a state of being unevenly distributed on the driven body 120, there is a risk of rolling that tends to occur in the width direction of the driven body 120 in the vicinity of the most elevated position of the driven body 120. Even in some cases, the pair of meshing chains 111 and 111 respectively disposed on the left and right sides of the driven body 120 divides the total load including the mounted driven object into two parts to reduce the load. It is designed to move up and down in the state.

As shown in FIGS. 2 and 3, the drive sprocket 140 is provided at a rigid position where the pair of meshing chains 111, 111 are integrally meshed with each other, and one bush of the pair of meshing chains 111, 111 is disposed. The pair of meshing chains 111 and 111 are driven by engaging with 111D.
That is, the driving sprocket 140 and the meshing chain unit 110 exhibit a so-called pinion rack mechanism, and the meshing chain 111 is wound around the driving sprocket 140 at a deflection position where the driving sprocket 140 is deflected and driven from the chain branching direction to the chain meshing direction. In this case, since the pulsation (vertical movement) caused by the well-known cordal action (polygonal movement) generated between the driving sprocket 140 and the meshing chain 111 is avoided, the movement of the meshing chain 111 with respect to the chain storage means 160 can be prevented. It can be stabilized.

Next, the detailed structure of the meshing chain unit 110 according to the present embodiment will be described with reference to FIG.
As shown in FIG. 4, the meshing chain unit 110 according to the present embodiment includes an inner link unit 111E formed by press-fitting a pair of front and rear bushes 111D to a pair of left and right hook-shaped inner teeth plates 111A that are spaced apart from each other. And a hook-like external tooth plate 111B arranged outside the inner link unit 111E in the longitudinal direction Y of the chain by a pair of front and rear connecting pins 111C press-fitted into a pair of front and rear pin holes of the hook-like outer tooth plate 111B. A large number of meshing chains 111, 111 connected to each other are arranged to face each other, and the pair of meshing chains 111, 111 are opposite to each other and the hook-like inner tooth plates 111B are opposed to each other. And the chain stiffening part in an integrated state in the chain stiffening direction D1 10G is formed and the hook-shaped inner tooth plates 111A and the hook-shaped outer tooth plates 111B are disengaged from each other and branched to each other so that the pair of meshing chains 111 and 111 are stiffened and branched. It has become.

Next, a specific form most characteristic of the meshing chain unit 110 according to the above-described embodiment will be described in detail with reference to FIGS.
In the meshing chain unit 110 according to the present embodiment, when the pair of meshing chains 111 and 111 project the chain stiffening portion 110G onto a virtual plane S that is orthogonal to the chain stiffening direction D1 and includes the pin axis of the connecting pin 111C. The connecting pin projection region R1, the hook-shaped internal tooth plate projection region, and the hook-shaped external tooth plate projection region, that is, the plate projection region formed by the adjacent hook-shaped internal tooth plate and hook-shaped external tooth plate. By forming a square SQ in the chain rigidized partial projection region RG made of R2, along the in-plane directions parallel to the hook-like inner tooth plate 111A and the hook-like outer tooth plate 111B, respectively. The mesh-direction support surface S2 that secures the rigidity of the chain stiffening portion 110G is hooked. A width for securing the rigidity of the chain stiffening portion 110G along the chain width direction X, which is the opposite direction of the pair of left and right hook-shaped inner teeth plates 111A, 111A Since the direction support surface S1 is constituted by the connecting pin 111C, the in-plane direction and the chain width parallel to the hook-like inner tooth plate 111A and the hook-like outer tooth plate 111B in a state where the meshing chain 111 is constituted by a single row. The rigidity of the chain stiffening portion 110G is ensured along the direction X to increase the chain manufacturing cost, increase the chain maintenance cost, increase the number of chain assembly processes, and decrease the chain assembly accuracy. , Avoiding increased energy loss and limited component installation space when driving meshing chains In addition, twisting of the meshing chain 111, disconnection of the connection pin 111C with respect to the external tooth plate 111B, disconnection of the bush 111D with respect to the internal tooth plate 111A, and inclination of the connection pin 111C with respect to the external tooth plate 111B are avoided. Further, rattling of the external tooth plate 111B and the internal tooth plate 111A is avoided.
6 to 10, the chain-stiffened partial projection region RG has an inner width W1 between the inner tooth plates 111A facing each other along the chain width direction X, and along the chain width direction X. And a pair of couplings facing each other along the plate surfaces of the inner tooth plate 111A and the outer tooth plate 111B. Since the square SQ is defined based on the pin-to-pin distance L of the pins 111C and 111C, the square SQ has an inner width W1 between the inner tooth plates 111A, an outer width W2 between the outer tooth plates 111B, and a pin diameter of the connecting pin 111C. The size is appropriately changed according to φ and the inter-pin distance L.

  In the meshing chain unit 110 according to the present embodiment, at least one of the hook-shaped inner tooth plate 111A, the hook-shaped outer tooth plate 111B, and the connecting pin 111C meshes the pair of meshing chains 111 and 111 with each other. The hook-shaped inner tooth plate 111A is engaged during the meshing operation of the pair of meshing chains 111 and 111 by elastically deforming the pair of meshing chains 111 and 111 so that there is no play between the parts constituting the pair of meshing chains 111 and 111 when the forming portion 110G is formed. The hook-shaped inner tooth plates 111A and the hook-shaped outer tooth plates 111B are engaged with each other in a state in which an urging force generated in association with at least one elastic deformation of the hook-shaped outer tooth plate 111B and the connecting pin 111C is applied. Chains 111, 111 are rigidized together to check the chain In order to form the stiffened portion 110G, the chain stiffening portion 110G is increased in rigidity in the state where the meshing chain 111 is formed in a single row, and the chain manufacturing cost increases due to the increase in the number of parts, the chain maintenance cost increases, the chain assembly Increase in the number of processes, decrease in chain assembly accuracy, increase in energy loss during driving of the meshing chain, and limitation of part installation space, twisting of the meshing chain 111, disconnection of the connecting pin 111C with respect to the external tooth plate 111B, internal tooth plate The bushing 111D is prevented from coming off from 111A and the connecting pin 111C is inclined from the external tooth plate 111B, and the deterioration of the chain durability and the backlash of the external tooth plate 111B and the internal tooth plate 111A are further avoided. .

  In the meshing chain unit 110 of the present invention obtained in this way, the pair of meshing chains 111, 111 are orthogonal to the chain stiffness direction D1 and the chain rigidized portion is in a virtual plane S including the pin axis of the connecting pin 111C. When 110G is projected, a square SQ can be drawn in the chain rigidized partial projection region RG including the connecting pin projection region R1, the hook-shaped internal tooth plate projection region R2, and the hook-shaped external tooth plate projection region R3 of the chain rigidized portion 110G. In the state where the meshing chain 111 is formed in a single row, the hook-shaped inner tooth plate 111A and the hook-shaped outer tooth plate 111B are parallel to the respective plates and along the chain width direction X. Check the chain along the increase in the number of parts by isotropically securing the rigidity of the chain stiffening part 110G. Increase in chain manufacturing cost, increase in chain maintenance cost, increase in the number of chain assembly processes, decrease in chain assembly accuracy, increase in energy loss during driving of the meshing chain, and limitation of space for installing parts, and twisting of the meshing chain 111, The connection pin 111C with respect to the external tooth plate 111B, the bush 111D with respect to the internal tooth plate 111A, and the inclination of the connection pin 111C with respect to the external tooth plate 111B are avoided, and the chain durability is reduced and the external tooth plate 111B and internal teeth The effect is enormous, such as the backlash of the plate 111A being avoided.

DESCRIPTION OF SYMBOLS 100 ... Engagement chain type advance / retreat operation device 110 ... Engagement chain unit 111 ... Engagement chain 111A ... Hook-like inner tooth plate 111B ... Hook-like outer tooth plate 111C ... Connection pin 111D ... Bush 111E ... Inner link unit 120 ... Driven body 130 ... Base plate 140 ... Drive sprocket 141 ... Drive shaft 150 ... Drive motor 151 ... Power transmission chain 152・ Drive side sprocket 160 ・ ・ ・ Chain storage means 161 ・ ・ ・ Chain storage box 170 ・ ・ ・ Chain guide plate 180 ・ ・ ・ Chain guide D1 ・ ・ ・ Chain stiffening direction G ・ ・ ・ Installation surface L ・ ・ ・ Connection Pin-to-pin distance W1 ... of the internal tooth plate Width W2 ... External width of external tooth plate S ... Virtual plane S1 ... Width direction support surface S2 ... Mating direction support surface RG ... Chain stiffening partial projection region R1 ... Chain stiffening Part connection pin projection area R2 ... Plate projection area formed by hook-shaped inner tooth plate and hook-shaped outer tooth plate adjacent to each other in chain stiffening part SQ ... Can be drawn in chain stiffening partial projection area Square X ... Chain width direction Y ... Chain longitudinal direction φ ... Pin diameter of connecting pin

Claims (2)

An inner link unit formed by press-fitting a pair of front and rear bushes to a pair of left and right hook-shaped inner teeth plates that are spaced apart from each other, and a hook-shaped outer tooth plate that is disposed outside the inner link unit A pair of meshing chains connected in the longitudinal direction of the chain by a pair of front and rear connecting pins press-fitted into a pair of front and rear pin holes of the external tooth plate are arranged opposite to each other, and the pair of meshing chains are opposed to each other. The hook-shaped external tooth plates and the hook-shaped external tooth plates facing each other are meshed with each other to form a chain-stiffened portion in an integrated state in the chain-stiffening direction and A meshing chain unit that separates the tooth plates from each other and branches to each other,
When the pair of meshing chains project the chain stiffening portion onto a virtual plane that is orthogonal to the chain stiffening direction and includes the pin axis of the connecting pin, a connecting pin projection region of the chain stiffening portion, a hook shape A meshing chain unit characterized in that a square is formed in a chain-stiffened partial projection region composed of an internal tooth plate projection region and a hook-shaped external tooth plate projection region.   At least one of the hook-shaped inner tooth plate, the hook-shaped outer tooth plate, and the connecting pin constitutes the pair of meshing chains when the pair of meshing chains are meshed with each other to form a chain stiffening portion. The meshing chain unit according to claim 1, wherein the chaining unit is elastically deformed in a state in which play between parts is eliminated.

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