JP6105802B1 - Roller chain connection jig - Google Patents

Abstract

A roller chain can be connected smoothly. SOLUTION: A pair of arms 21 and 21 each having a pinching portion 28 for holding rollers R1 of inner links L1 opposed to each other at an end portion of a roller chain C at a predetermined position, and the arms 21 and 21 can be freely opened and closed. The link portion 23 supported by the arm 21, the adjusting member 24 for adjusting the opening / closing amount of the arms 21, 21, the outer holding portion 31 for restricting the movement of the arms 21, 21 in the opening direction, and the closing direction of the arms 21, 21. Inner holding portions 32, 34, and 35 that restrict the movement of the outer holding portion 31 and the inner holding portions 32, 34, and 35 hold the rollers R <b> 1 at predetermined positions at least by the opening / closing amounts of the arms 21 and 21. In the closed state, the roller chain connecting jig 20 is configured to abut against the arms 21 and 21 and simultaneously restrict the movement in the opening direction and the closing direction. [Selection] Figure 2

Description

  The present invention relates to a roller chain connecting jig that holds open end portions at both ends of a roller chain at a predetermined interval when an open roller chain is connected in an annular shape.

  As shown in part in FIG. 10, the general roller chain C is composed of a bush, a pair of rollers R1 and R2 rotatably provided on the bush, and an inner link L1, an inner plate L An outer link L2 composed of a plate P is provided, and the inner link L1 is sequentially connected by the outer link L2 to form a single ring.

  When the roller chain C is connected in an annular shape, the ends of the roller chain C are butted against each other after the rollers R1 and R2 are engaged with the sprocket teeth, and the inner links L1 of the butted portions are connected with the outer link L2. Work is done. As the inner link L1, a pair of bushes provided adjacent to each other on the inner plate, and a roller R provided on each bush so as to be rotatable is generally used.

  At this time, both ends of the opened roller chain C can freely rotate around the pins connecting the inner and outer links L1, L2. For this reason, it is difficult to position the inner links L1 to be connected to each other, and the connection work often requires labor. Therefore, using a roller chain connecting jig 10 as shown in FIG. 10, the work is performed after the inner links L1 at both ends are held at a predetermined interval.

  The roller chain connecting jig 10 includes arms 1 and 1 provided facing each other so as to sandwich the rollers R1 and R1 on the side close to the open end of the inner link L1 to be connected, and both arms 1 and 1. Adjustment is made by a link portion 3 that can be freely opened and closed in the connecting direction of the roller chain C, an adjustment screw 4 that is screwed into the link portion 3 to adjust the opening / closing amount of both arms 1, 1, a washer 5 and a retaining member 6. And a base portion 7 provided so as not to move relative to the screw 4 in the axial direction and to be rotatable around the shaft. The front end of the arm 1 is inserted between the rollers R1 and R2 arranged in parallel, and serves as a clamping unit 8 that clamps the opposing rollers R1 and R1.

  The base portion 7 has a structure in which a spacer is sandwiched between two plate-like members and is connected by four rivets 7a and 7b, and a gap having a predetermined width is secured between the plate-like members. Both arms 1 and 1 are inserted into the gap between the plate-like members, and both arms 1 and 1 can freely rotate within the gap.

  A handle 9 is provided at the tip of the adjustment screw 4. When the handle 9 is rotated in one direction, the adjustment screw 4 is screwed into the link portion 3, and the link portion 3 moves in a direction away from the base portion 7. At this time, the contact portion 2 provided along the outer side surface of the arm 1 is in contact with the two outer rivets 7a and 7a among the four rivets 7a and 7b connecting the two plate-like members. The link portion 3 moves away from the base portion 7, and the contact portion between the rivets 7 a and 7 a and the contact portion 2 moves toward the distal end side of the arm 1.

  As the contact portion moves, the distance between the opposing arms 1 and 1 decreases, and the opposing rollers R1 and R1 approach each other. When the rollers R1 and R1 facing each other approach each other and the inner links L1 and L1 reach a predetermined position, a pin is inserted into the bush of the inner link L1 and the outer plate P is attached. It becomes a single ring (see, for example, Patent Document 1).

Japanese Patent Laying-Open No. 2006-068215

  By the way, when a pin is inserted into each bush of the opposing inner links L1 and L1 and the outer plate P is attached, the distance between the opposing arms 1 and 1 of the roller chain connecting jig 10 is widened in the middle of the work. There is a case.

  As described above, when the distance between the facing arms 1 and 1 is increased, the distance between the facing inner links L1 and L1 is increased. For this reason, the inner links L1 and L1 cannot be connected by the outer link L2, and the connecting operation cannot be performed smoothly. Further, the arms 1 and 1 may fall off the roller chain C.

  Therefore, an object of the present invention is to make it possible to smoothly perform the roller chain coupling operation.

  In order to solve the above-described problems, the present invention provides a pair of arms each having a holding portion that holds the rollers of the inner links facing each other at the end portions of the roller chain in a predetermined position, and the arms can be opened and closed. A link portion that supports the arm, an adjustment member that adjusts an opening / closing amount of the arm, an outer holding portion that restricts movement of the arm in the opening direction, and an inner holding portion that restricts movement of the arm in the closing direction. The outer holding portion and the inner holding portion are in contact with the arm at least when the opening / closing amount of the arm is in the closed state holding the rollers at the predetermined position, and the opening direction and the closing direction thereof. A roller chain coupling jig that simultaneously regulates the movement of

  Here, the structure which is a pin which contact | abuts the outer side holding part to the outer side contact part provided in the end surface of the opening / closing direction outer side of the said arm can be employ | adopted.

  The inner holding portion may be a pin that abuts on an inner abutting portion provided on the inner side in the opening / closing direction of the arm.

  At this time, the outer contact portion and the inner contact portion extend in a direction extending along the opening / closing direction from the link portion side to the clamping portion side of the arm, and constitute the outer holding portion. The line connecting the shaft centers of the pins can adopt a configuration that is closer to the link portion than the line connecting the shaft centers of the pins constituting the inner holding portion.

  The inner holding portion may be an elastic member that abuts on an inner abutting portion provided on the inner side in the opening / closing direction of the arm.

  The inner holding part continuously contacts the outer contact part and the inner contact part from the open state in which the opening / closing amount of the arm temporarily holds the rollers before being connected to the closed state. A configuration can be employed.

  The present invention provides an outer holding portion and an inner holding portion that abut against the arm and at the same time regulate the movement in the opening direction and the closing direction when at least the opening / closing amount of the arm is in a closed state that holds the rollers in a predetermined position. Since the roller chain is provided, the roller chain can be connected smoothly.

1A and 1B show a first embodiment of the present invention, in which FIG. 1A is a front view, FIG. 1B is a right side view of FIG. 1A, and FIG. It is a perspective view of a first embodiment. It is a front view which shows the use condition of 1st embodiment. It is a front view which shows the use condition of 1st embodiment. (A) and (b) are the principal part enlarged views which show the modification of 1st embodiment. A 2nd embodiment of this invention is shown, (a) is a front view, (b) is a right view of (a), and (c) is a CC sectional view of (a). It is a perspective view of 2nd embodiment. It is a front view which shows the use condition of 2nd embodiment. It is a front view which shows the use condition of 3rd embodiment. It is a front view which shows the roller chain connection jig | tool of a prior art example.

  A roller chain connecting jig 20 according to a first embodiment of the present invention is shown in FIGS. FIG. 5 shows a modification of the first embodiment.

  In order to connect the ends of the roller chain C, the roller chain connecting jig 20 includes a pair of arms provided with a holding portion 28 that holds the rollers R1 of the inner links L1 facing each other at predetermined positions. 21, 21, a link portion 23 that supports the pair of arms 21, 21 so as to be openable and closable in the connecting direction of the roller chain C, and an adjustment member that is screwed into the link portion 23 to adjust the opening / closing amount of the pair of arms 21, 21 24.

  The adjustment member 24 includes an adjustment screw (hereinafter referred to as an adjustment screw 24). The roller chain connecting jig 20 includes a base portion 27 that is provided with a washer 25 and a retaining member 26 so as not to move relative to the axial direction of the adjusting screw 24 and to be rotatable around the shaft. ing.

  The sandwiching portion 28 is provided at the tip of the pair of arms 21 and 21, and the sandwiching portion 28 is inserted between the pair of rollers R 1 and R 2 inserted through the inner link L 1 at the open end of the roller chain C. The rollers R1 and R1 inserted through the inner links L1 on both sides with the open end of the roller chain C interposed therebetween are sandwiched.

  As shown in FIG. 2, the base portion 27 includes a through hole 27 c in a base portion 27 b located at the center portion thereof. The adjusting screw 24 is inserted into the through hole 27c. No threaded portion is formed on the inner surface of the through hole 27c.

  Two plate-like portions 27a extend in parallel from the base portion 27b on both sides along the opening / closing direction of the arms 21 and 21, and a slit having a predetermined width is provided between the two plate-like portions 27a. A gap 33 is formed. The arms 21 are inserted into the gaps 33 on both sides. Since the width w of the gap 33 is slightly wider than the thickness t of the arms 21 and 21, the arms 21 and 21 can be freely rotated within the gap 33. As shown in FIG. 2, the base portion 27 may be formed of an integrally molded member. For example, the base portion 27 is held by a spacer made of another member having two plate-like members sandwiched between its central portions. In addition, the gap portion 33 may be secured between the two plate-like members, or may be constituted by a plurality of members.

  Further, as shown in FIG. 2, the sandwiching portion 28 has a thickness u that is relatively larger than the thickness t of the portion of the member inserted through the gap portion 33. In this embodiment, the thickness u of the clamping part 28 is 50% of the length of the roller R1 in the rotation axis direction. Accordingly, the vicinity of the center in the length direction of the roller R1 can be clamped by the clamping unit 28, and the inner link L1 can be prevented from being inclined when the inner links L1 are brought closer to each other. .

  The action that the clamping unit 28 clamps the roller R1 at the center in the length direction is that the thickness u of the clamping unit 28 is 50 to the length of the roller R1 (the length between the inner surfaces of the inner links L1 and L1). This is exhibited when the amount is within the range of 100%. When the action of the sandwiching portion 28 is not required, the thickness of the sandwiching portion 28 may be the same as the thickness of the member inserted into the gap portion 33 of the arm 21.

  A handle 29 is provided at the rear end of the adjustment screw 24. When the handle 29 is rotated in one direction around the axis of the adjustment screw 24, the adjustment screw 24 is screwed into the link portion 23, and the link portion 23 moves in a direction away from the base portion 27. Thereby, the clamping part 28 of the arms 21 and 21 can be made to approach. Further, when the handle 29 is rotated in the other direction around the axis of the adjustment screw 24, the screwing amount of the adjustment screw 24 with respect to the link portion 23 decreases, and the rear end side of the adjustment screw 24 is pulled out from the link portion 23. Moves in a direction approaching the base portion 27. Thereby, the clamping part 28 of the arms 21 and 21 can be spaced apart.

  Further, the base portion 27 is provided with a holding mechanism 30 that holds the pair of arms 21 and 21 so as not to move in the opening and closing direction. The holding mechanism 30 exhibits a function of preventing the pair of arms 21 and 21 from moving in the opening and closing direction when the adjusting screw 24 is not operated. In particular, the holding mechanism 30 can also exhibit a function of preventing the arms 21 and 21 from rattling in the opening and closing direction when the adjustment screw 24 is not operated.

  The holding mechanism 30 includes an outer holding portion 31 that restricts the movement of the arms 21 and 21 in the opening direction, and an inner holding portion 32 that restricts the movement of the arms 21 and 21 in the closing direction.

  In the first embodiment, the outer holding portion 31 is constituted by a pin that comes into contact with an outer contact portion 22a provided on an end face on the outer side in the opening / closing direction of the arms 21 and 21. The pins constituting the outer holding portion 31 are provided by connecting the plate-like portions 27a and 27a on both sides with the gap portion 33 of the base portion 27 interposed therebetween.

  Further, the inner holding portion 32 is also configured by a pin that comes into contact with an inner contact portion 22b provided inside the arms 21 and 21 in the opening and closing direction. The pins constituting the inner holding portion 32 are provided by connecting the plate-like portions 27a and 27a on both sides with the gap portion 33 of the base portion 27 interposed therebetween.

  As shown in FIG. 3, the clamping portions 28 of the pair of arms 21 and 21 in the open state are inserted between the rollers R1 and R2 of the roller chain C, respectively. In the open state, the distance between both ends of the roller chain C is long, and it is not yet a state where these can be connected by the outer link L2.

  When the pair of arms 21 and 21 are in the open state, the holding mechanism 30 is configured such that the outer holding portion 31 and the inner holding portion 32 are connected to the outer contact portion 22a and the inner contact portion 22b of the pair of arms 21 and 21. Each of the arms 21 abuts and simultaneously regulates the movement of each arm 21 in the opening direction and the closing direction. Thereby, the situation where the clamping part 28 of the arm 21 will remove | deviate from the roller chain C can be prevented.

  Next, by operating the handle 29, the link portion 23 is moved away from the base portion 27, and the gap between the sandwiching portions 28, 28 is narrowed to be in a closed state, so that the inner links L 1, 1 at both ends of the roller chain C are closed. L1 approaches each other. As shown in FIG. 4, when the inner links L1 and L1 are close to a predetermined position, a pin is inserted into the bush of the inner link L1, and the outer plate P is attached. Become.

  When the pair of arms 21 and 21 are in this closed state, that is, when the opening and closing amounts of the arms 21 and 21 are in a state of holding the rollers R1 and R1 in a predetermined position, the holding mechanism 30 is provided with an outer holding portion. 31 and the inner side holding | maintenance part 32 each contact | abut to a pair of arms 21 and 21, and control the movement to the opening direction and the closing direction of each arm 21 simultaneously. As a result, the inner link L1 and the bush at the connecting portion of the roller chain C do not move and are held at a predetermined position, so that the pin can be easily inserted. Further, a situation in which the clamping portion 28 of the arm 21 is detached from the roller chain C does not occur. Here, the predetermined position means a position where the rollers R1, R1 are in a state where the pin is inserted into the bush of the inner link L1 and the outer plate P can be attached.

  When the movement of the arm 21 in the opening / closing direction is restricted (locked) by the holding mechanism 30, each pin constituting the outer holding portion 31 and the inner holding portion 32, and the corresponding outer contact portion 22a and inner contact portion 22b. The contact with each other is preferably a line contact along the axis of the pin. As the arm 21 is opened and closed, the contact position of each pin with the outer contact portion 22a and the inner contact portion 22b changes from the rear end side to the front end side or from the front end side to the rear end side. Since it moves, it is desirable for each pin to rotate around its axis during this movement.

  Here, the shape of the pair of arms 21 extends from the link portion 23 side of the arm 21 toward the holding portion 28 side in the direction of expanding along the opening / closing direction, and then toward the inside in the middle of the arm 21. And then extends in a narrowing direction along the opening and closing direction to reach the pinching portion 28 at the tip.

  The outer abutting portion 22a and the inner abutting portion 22b are each formed of a flat surface extending linearly, and extend in a direction extending along the opening / closing direction from the link portion 23 side of the arm 22 toward the clamping portion 28 side. ing.

  In this embodiment, as shown in FIG. 3, the outer contact portion 22a and the inner contact portion 22b are formed so that their surface directions are parallel to each other. A portion where the outer contact portion 22a and the inner contact portion 22b are parallel is hereinafter referred to as a parallel portion. However, the end portion near the tip of the inner contact portion 22b is an arcuate portion 22c that bends inward at the middle bent portion of the arm 21.

  As shown in FIG. 1A and FIG. 3, the line a connecting the shaft centers of the pins constituting the outer holding portion 31 is more than the line b connecting the shaft centers of the pins constituting the inner holding portion 32. The distance v is set on the link unit 23 side. For this reason, the angle α formed by the line d connecting the contact positions of the outer contact portion 22a and the inner contact portion 22b of each pin with respect to the direction of the center line c of the arm 21 can be made closer to a right angle. it can. If the line a and the line b are on the same straight line, the angle α becomes an acute angle with a smaller angle, and it is somewhat unstable to lock the movement of the arm 21 in the opening direction and the closing direction. . On the other hand, by shifting the line a to the link part side from the line b, the angle α becomes an acute angle closer to a right angle (in some cases, an obtuse angle close to a right angle can be set), and the movement of the arm 21 Can be stably locked in the opening direction and the closing direction.

  This angle α continues while the pair of arms 21 and 21 transitions from the open state shown in FIG. 3 to the closed state shown in FIG. 4, and becomes more perpendicular to the direction of the center line c of the arm 21. It is desirable to be in a close state.

  Moreover, in this embodiment, the terminal part near the front-end | tip part of the inner side contact part 22b becomes the circular arc-shaped part 22c which curves inside. Therefore, as shown in FIG. 4, the line d of the arm 21 intersects the arcuate portion 22c immediately before the pair of arms 21 and 21 reach the closed state, and the distance x along the line d Slightly larger than when crossing parallel parts. Thereby, the lock | rock of the movement to the opening / closing direction of the pair of arms 21 and 21 in a closed state can be made stronger.

  1 to 4 showing the first embodiment, the outer holding portion 31 and the inner holding portion 32 are in an open state in which the opening and closing amounts of the arms 21 and 21 are close to the maximum (see FIG. 3). When the opening / closing amounts of the arms 21 and 21 are in a closed state corresponding to a predetermined position (see FIG. 4), the movement of each arm 21 in the opening direction and the closing direction is simultaneously restricted. This may be further improved to continuously contact the outer contact portion 22a and the inner contact portion 22b, respectively, from the open state to the closed state.

  When the pair of arms 21 and 21 are continuously in contact with the outer contact portion 22a and the inner contact portion 22b, respectively, from the open state to the closed state, for example, FIG. 5 (a) (b) As shown in FIG. 5, a bulging portion 22d for expanding the width of the arm 21 is formed in the inner contact portion 22b in a range where the pin contacts in the middle from the open state to the closed state. By providing the bulging portion 22d, the distance x along the line d of the arm 21 is increased by the distance y in the section where the bulging portion 22d is provided. As a result, the distance x along the line d of the arm 21 is made constant from the open state to the closed state of the arm 21 or more than a constant, and the continuous contact between the outer holding part 31 and the inner holding part 32 is made. Can be maintained.

  Explaining this point, since the outer contact portion 22a and the inner contact portion 22b of the parallel portion of the arm 21 are parallel to each other, when the pair of arms 21 and 21 transition from the open state to the closed state, Since the angle α gradually increases and approaches a right angle, the distance x along the line d of the arm 21 gradually decreases, and a temporary minute gap is formed between the inner contact portion 22b and the inner holding portion 32. Will occur. The bulging part 22d eliminates the occurrence of this gap. For this reason, the bulging part 22d can also be provided on the outer contact part 22a side.

  A second embodiment of the present invention is shown in FIGS. In this embodiment, an elastic member that contacts the inner contact portion 22b of the arms 21 and 21 is employed as the inner holding portion 34. Since the basic configuration of the roller chain connecting jig 20 is the same as that of the first embodiment, only the configuration of the inner holding portion 34 that is different from the first embodiment will be described below.

  As shown in FIG. 6, the inner holding portion 34 is configured by a leaf spring that is curved in an arc shape. By using various springs such as leaf springs or other elastic members as the inner holding portion 34, the inner holding portion 34 elastically presses the arm 21 toward the outer holding portion 31 and in the opening / closing direction thereof. Can be stably locked.

  The inner holding portion 34 made of a leaf spring has a spring base portion 34 b located at the center thereof fixed to the base portion 27. As shown in FIG. 7, the adjustment screw 24 is inserted into a hole 34 c provided in the spring base 34 b, and the spring base 34 b is fixed by a screw thread of the adjustment screw 24 so as not to be separated from the upper surface of the base portion 27. Yes.

  The leaf | plate spring of the inner side holding | maintenance part 34 is the circular-arc-shaped front-end | tip part 34a extended from the spring base 34b to the both sides of an opening-and-closing direction, and the front-end | tip curved inward. The arcuate tip 34a is curved along the arcuate part 22c of the arm 21, and slides into contact with the arcuate part 22c as the pair of arms 21 and 21 opens and closes. By this sliding contact, the inner holding portion 34 can continuously contact the inner contact portion 22b until the arms 21 and 21 change from the open state to the closed state. Moreover, the outer side holding | maintenance part 31 is continuously contact | abutted to the outer side contact part 22a until the arms 21 and 21 change from an open state to a closed state. When the pair of arms 21 and 21 rotate in the closing direction, the arm 21 operates against the elastic force of the leaf spring, and the leaf spring elastically presses the arm 21 toward the outer holding portion 31 side. Thus, the movement in the opening and closing direction can be restricted (locked).

  A third embodiment of the present invention is shown in FIG. The inner holding portion 35 of this embodiment is constituted by a torsion coil spring. By using a torsion coil spring as the inner holding portion 35, the inner holding portion 35 can elastically press the arm 21 toward the outer holding portion 31 and can stably lock the movement in the opening and closing direction. . This is the same as the case where a leaf spring is used as the inner holding portion 34.

  As shown in FIG. 9, in the torsion coil spring, a wire-like member is spirally wound to form a central winding portion, and both ends of the wire-like member are outward from the central winding portion. It protrudes and constitutes a pressing part. The spring fixing pin 36 of the base portion 27 is inserted through the central winding portion, the torsion coil spring is fixed to the base portion 27, and one of the pressing portions is provided at any location of the base portion 27. The other pressing portion contacts the inner contact portion 22b of the arm 21. When the pair of arms 21 and 21 rotate in the closing direction, the arm 21 operates against the elastic force of the torsion coil spring, and the torsion coil spring elastically moves the arm 21 to the outer holding portion 31 side. The movement in the opening / closing direction can be restricted (locked).

  Note that the elastic force (biasing force) of various elastic members used as the inner holding portions 34 and 35 is a force that can hold the roller R1 firmly without rattling when the roller chain C is connected. It is desirable that

  In each of the above-described embodiments, the screw shaft is employed as the adjustment member 24. However, the adjustment member 24 having a configuration other than the screw mechanism may be used. For example, the pair of arms 21 and 21 may be opened and closed by the adjustment member 24 using a link mechanism.

1, 21 Arm 2, Abutting portion 3, 23 Link portion 3a, 23a Pins 4, 24 Adjustment screw (adjustment member)
5,25 washers 6, 26 retaining members 7, 27 base parts 7a, 7b rivets 8, 28 clamping parts 9, 29 handle 10, 20 roller chain connecting jig 22a outer contact part 22b inner contact part 22c arcuate part 22d bulging portion 30 holding mechanism 31 outer holding portion (pin)
32 Inner holding part (pin)
33 Gap part 34, 35 Inner holding part (elastic member)
36 Fixing pin L1 Inner link L2 Outer link R (R1, R2) Roller P Plate C Roller chain

Claims (4)

A pair of arms (21, 21) provided with a clamping portion (28) at the tip thereof for holding the rollers (R1) of the inner links (L1) facing each other at the end of the roller chain (C);
A link portion (23) that supports the arms (21, 21) so as to be freely opened and closed;
An adjustment member (24) for adjusting the opening and closing amount of the arms (21, 21);
An outer holding portion (31) for restricting movement of the arms (21, 21) in the opening direction;
Comprising a, an inner holding portion (32, 34, 35) for restricting the movement of the closing direction of the arms (21, 21),
The outer holding portion (31) and the inner holding portion (32, 34, 35) are in a closed state in which at least the opening / closing amount of the arms (21, 21) holds the rollers (R1) in the predetermined position. And abut against the arms (21, 21) to simultaneously restrict the movement in the opening direction and the closing direction ,
The outer holding part (31), Ri abutting pin der the outer abutment portion provided on the end face of the opening and closing direction outside (22a) of said arms (21, 21), the inner holding portion (32), the abutting pin der inside the contact portion (22b) provided in the opening and closing direction inside the arm (21, 21) is, the outer contact portion (22a) and the inner contact portion (22b), said arm ( the clamping portion from said link portion (23) side of the 21, 21) (28) extends in a direction extending along the opening and closing direction toward the side, the axis between the pins constituting the outer retaining portion (31) line connecting, the inner holding portion and the link portion than a line connecting the axial center between the pins constituting the (32) (23) side der Ru roller chain connecting jig. A pair of arms (21, 21) provided with a clamping portion (28) at the tip thereof for holding the rollers (R1) of the inner links (L1) facing each other at the end of the roller chain (C);
A link portion (23) that supports the arms (21, 21) so as to be freely opened and closed;
An adjustment member (24) for adjusting the opening and closing amount of the arms (21, 21);
An outer holding portion (31) for restricting movement of the arms (21, 21) in the opening direction;
Comprising a, an inner holding portion (32, 34, 35) for restricting the movement of the closing direction of the arms (21, 21),
The outer holding portion (31) and the inner holding portion (32, 34, 35) are in a closed state in which at least the opening / closing amount of the arms (21, 21) holds the rollers (R1) in the predetermined position. And abut against the arms (21, 21) to simultaneously restrict the movement in the opening direction and the closing direction ,
It said inner holder (34, 35), the elastic member der Ru roller chain connecting jig in contact with the inner contact portion which is provided (22b) in the closing direction inside the arm (21, 21). The roller chain coupling jig according to claim 2 , wherein the outer holding portion (31) is a pin that abuts on an outer abutting portion (22a) provided on an end surface of the arm (21, 21) on the outer side in the opening / closing direction. Said inner holder (32, 34, 35), the opening and closing of said arms (21, 21) is, by continuing the roller (R1) between the previous connection from the open state to temporarily held up in the closed state The outer holding portion (31) is in contact with the inner abutting portion (22b), and the opening and closing amount of the arms (21, 21) is from the open state in which the rollers (R1) before being connected are temporarily held. The roller chain connecting jig according to claim 1 or 3 , wherein the roller chain connecting jig continuously contacts the outer contact portion (22a) until the closed state is reached .

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