JP2009185851A - Belt mounting tool and belt mounting method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To attach a belt to a plurality of pulleys including a back-side pulley of a two-stage pulley while preventing the belt from hitching on the side face on the front side of the pulley. <P>SOLUTION: This belt attachment tool 1 is changeable between an attachment attitude for attaching the belt 3 and a shift attitude for shifting the belt 3 to the back side. Once, the belt 3 is applied onto a front side pulley 2a of the first pulley 2 as the two-stage pulley and the belt 3 is located on the front side. In this state, the belt attachment tool 1 is mounted on the second pulley 11 in the attachment attitude and the belt 3 is attached to the side face on the front side without being hitched thereon. Then, the belt attachment tool 1 is remounted on the first pulley 2 in the shift attitude and the belt 3 applied onto the front side pulley 2a is shifted to the back-side pulley 2b. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a belt attaching jig and a belt attaching method for attaching a belt that can be extended in a circumferential direction to a plurality of pulleys including a rear pulley of a two-stage pulley.

  Generally, a belt transmission mechanism in which a belt is wound around a pulley having a pulley groove on the outer peripheral surface is provided with tension adjusting means such as a tension pulley so that a predetermined belt tension is applied after the belt is attached to the pulley. It has been.

  In order to eliminate the need for such tension adjusting means, a belt has appeared that is extended in the circumferential direction so as to get over the pulley flange when attached to the pulley. Further, Patent Document 1 discloses that the belt extends in the circumferential direction. A belt mounting jig is disclosed for extending over a pulley flange while being extended and fitting into a pulley groove.

FIG. 5 shows a belt mounting jig disclosed in Patent Document 1. The belt attaching jig 101 is used by being attached to the pulley 102. The belt 104 is fitted in the pulley groove 103 at the rear of the pulley rotating direction than the belt attaching jig 101, and the belt 104 is hung on the holding surface 105. To hold. Further, by attaching a tool to the center bolt 106 of the pulley 102 and rotating it, the belt mounting jig 101 is advanced forward in the pulley rotation direction, and the range of the belt 104 that fits in the pulley groove 103 is gradually widened. 104 is attached to the pulley 102.
JP 2006-300192 A (paragraph numbers 0028, 0035, 0036, 0043, 0044, FIG. 6)

  By the way, the belt may be attached to a plurality of pulleys including the rear pulley of the two-stage pulley. In this case, the belt is wound around the rear pulley and the belt attachment jig of Patent Document 1 is attached to the other pulley. Attach and attach the belt. However, when the belt is attached to the pulley on which the belt mounting jig is mounted, the belt is easily rubbed against the side surface on the near side of the pulley, and the belt is easily caught. If there are protrusions such as bolts on the side of the belt, it will be difficult to attach the belt.

  The present invention provides a belt mounting jig and a belt mounting method capable of preventing the front side surface of the pulley and the belt from being caught when the belt is mounted on a plurality of pulleys including the back pulley of the two-stage pulley. With the goal.

  In order to achieve the above object, a belt mounting jig according to the present invention projects from a jig main body, a locking portion for locking the jig main body to a pulley flange, and a back side from the jig main body. A protrusion and a guide surface formed on the protrusion so as to guide a belt that can be extended in the circumferential direction to the rear side in the pulley axial direction, and an attachment posture for attaching the belt to the pulley groove on the pulley; The belt can be mounted in a shift posture in which the belt is shifted from the front pulley of the two-stage pulley to the rear pulley.

  Here, the mounting posture is a posture in which the locking portion is locked to the pulley flange on the near side and the jig main body is disposed on the near side in the pulley axial direction with respect to the pulley, and the belt is moved to the jig as the pulley rotates. The rear surface of the jig body receives a part of the belt and has a radius that is larger than the outer peripheral surface of the pulley flange on the near side while regulating the belt detachment toward the near side with the protrusion until the body slides into the pulley groove. Hold on the outside in the direction and on the near side in the pulley axial direction.

  In this mounting posture, with the jig body as a boundary, the belt is fitted in the pulley groove at the rear in the pulley rotation direction, and the belt is passed through the pulley axially outside at the front in the pulley rotation direction. Hang it on the pulley and belt mounting jig. Further, when the pulley is rotated, the belt mounting jig also rotates in the circumferential direction following the rotation of the pulley, so that the belt passing through the outside in the axial direction of the pulley in front of the belt rotation direction than the belt mounting jig is outside the radial direction. When it moves in the direction and reaches the outer side in the radial direction from the outer peripheral surface of the pulley flange, it slides over the pulley flange and fits into the pulley groove.

  The shift posture is a posture in which the jig body is disposed in the pulley groove of the front pulley while the locking portion is locked to the pulley flange at the boundary between the front pulley and the rear pulley, and the guide surface is As the step pulley rotates, the belt riding on the back surface and the protruding portion of the jig body is guided to the pulley groove of the back pulley.

  According to the above configuration, the mounting posture and the shift posture can be switched freely, and the guide surface that guides the belt to the rear side in the pulley axial direction is formed on the protruding portion that protrudes from the jig body to the back side. With the protrusion, in the mounting posture, the belt is prevented from coming off until the belt is attached to the pulley, and in the shift posture, the belt riding on the back side of the jig can be shifted to the back pulley.

  Accordingly, the belt can be attached to a plurality of pulleys including the rear pulley of the two-stage pulley without using a single belt attachment jig to hook the belt on the side surface on the near side of the pulley.

  Specifically, once the belt is wound around the pulley on the front side of the two-stage pulley, a belt mounting jig is mounted on another pulley in a mounting posture, and the belt is mounted on the pulley groove of the pulley, Thereafter, the belt attaching jig is remounted on the two-stage pulley in a shift position, and the belt wound around the front pulley is shifted to the rear pulley. In this case, the belt can be positioned on the near side when attaching the belt to the other pulley while the belt is wound on the near pulley of the two-stage pulley, and the side surface on the near side of the pulley It is possible to prevent the belt from being caught.

  When the rear pulley has a larger diameter than the front pulley, when the belt is once wrapped around the front pulley and attached to another pulley, the belt can be easily attached because the front pulley has a smaller diameter. it can. In this case, after attaching the belt to other pulleys, the front side can be attached to the two-stage pulley with the rear pulley set to have a larger diameter than the front pulley by allowing the belt mounting jig to be mounted in a shift position. The belt wound around the pulley can be shifted so as to push up the large-diameter back pulley.

  Further, the present invention is a two-stage pulley comprising a plurality of pulleys including a first pulley and a second pulley, wherein at least the first pulley is provided with a front pulley and a rear pulley arranged side by side in the pulley axial direction. Provided is a belt attachment method for attaching a belt that can be extended in the circumferential direction to a pulley groove of a back pulley of a first pulley together with a pulley groove of a pulley other than the first pulley.

  Specifically, the belt is wound around the pulley on the front side of the first pulley, and a belt attaching jig is attached to the second pulley. Further, the belt is attached to the pulley groove of the second pulley while rotating the second pulley. Thereafter, a belt attachment jig is attached to the first pulley, and the belt wound around the front pulley of the first pulley is shifted to the pulley groove of the back pulley while rotating the first pulley.

  According to the above configuration, the belt is attached to the second pulley by attaching the belt attaching jig to the second pulley and attaching the belt to the plurality of pulleys with the belt wound around the pulley on the near side of the first pulley. At this time, since the belt is positioned on the near side, the belt can be prevented from being caught on the near side surface of the second pulley. Moreover, since the belt is shifted from the front pulley of the first pulley to the back pulley after the belt is attached to the second pulley, the belt is attached to a plurality of pulleys including the back pulley of the first pulley that is a two-stage pulley. Can be attached.

  When setting the front pulley of the first pulley to have a smaller diameter than the back pulley, the pulley groove of the second pulley without applying tension to the belt while the belt is wound around the front pulley of the first pulley. A wide range of belts can be fitted.

  As a result, even if there is a protrusion such as a bolt on the front side surface of the second pulley, the belt can be avoided in advance radially outward from this protrusion. It is possible to prevent it from being caught. In addition, since the belt can be attached only by slightly rotating the second pulley, it is possible to make it more difficult for the belt to be caught by rubbing against the side surface on the near side of the second pulley.

  Moreover, when attaching a belt attachment jig to a 2nd pulley and attaching a belt, a belt can also be attached, rotating a 2nd pulley via a belt by rotating the 1st pulley which wound the belt. .

  Then, for example, even if the second pulley is a pulley on the small diameter side or the low load side, the belt can be attached by rotating the first pulley on the large diameter side or the high load side with a tool or the like. The force required to rotate the pulley directly with a tool or the like can be reduced or stabilized.

  In particular, when the front pulley of the first pulley is set to have a smaller diameter than the rear pulley, the belt wound around the small pulley on the near side passes through a portion farther from the center of rotation on the front side of the second pulley. become. As a result, the belt tension applied to the belt mounting jig acts more forward in the rotational direction of the second pulley than when the front pulley of the first pulley has a large diameter. It becomes easier to rotate the pulley.

  In order to employ the method of the present invention, at least the first pulley of the plurality of pulleys only needs to be a two-stage pulley, and in addition to the first pulley, the other pulleys are also a two-stage pulley. May be. When the second pulley is a two-stage pulley, a belt may be temporarily attached to the front pulley of the second pulley and the belt may be shifted to the back pulley. Furthermore, the timing at which the belt is shifted to the back pulley in the second pulley may be either before or after the belt is shifted in the first pulley.

  That is, the present invention is based on the above method, the second pulley is a two-stage pulley, once the belt attachment jig is attached to the second pulley and the belt is attached to the pulley groove of the front pulley, Furthermore, before or after shifting the belt wound around the front pulley of the first pulley to the pulley groove of the back pulley, a belt attachment jig is attached to the second pulley and the second pulley is rotated. Provided is a belt attachment method for shifting a belt attached to a pulley groove of a front pulley of a second pulley to a pulley groove of a rear pulley.

  As described above, according to the present invention, once the belt is wound around the pulley on the near side of the two-stage pulley, the belt is attached to the other pulley by attaching the belt attaching jig to the other pulley, and then the two-stage pulley is attached. The belt is shifted from the front pulley of the hanging pulley to the rear pulley. As a result, when attaching the belt to another pulley, the belt can be positioned on the near side, so that the side surface on the near side of the other pulley and the belt do not get caught, and the back side of the two-stage pulley The belt can be attached to a plurality of pulleys including pulleys.

  Hereinafter, the best mode for carrying out the belt mounting jig according to the present invention will be described with reference to the drawings.

  First, the configuration of the belt mounting jig will be described. FIG. 1 is a perspective view of a belt attachment jig according to the present invention, FIG. 2 is a front view of the belt attachment jig attached to a pulley, (a) shows an attachment posture, and (b) shows a shift posture.

  The belt attaching jig 1 is connected to the back pulley 2b of the first pulley 2 and the second pulley 11 which are two-stage pulleys formed by juxtaposing the front pulley 2a and the back pulley 2b. For attaching a belt 3 that can be extended in the direction, a jig body 4, a locking portion 6 for locking the jig body 4 to pulley flanges 5a and 5b, and a back side from the jig body 4. A mounting posture for attaching the belt 3 to the pulley groove 12 of the second pulley 11, and a guide surface 8 formed on the protrusion 7 so as to guide the belt 3 to the inner side in the pulley axial direction. The shift posture of shifting the belt 3 from the pulley groove 9a of the front pulley 2a of the first pulley 2 to the pulley groove 9b of the back pulley 2b is freely switchable.

  Here, the mounting posture is a posture in which the locking portion 6 is locked to the pulley flange 5a on the near side of the second pulley 11 and the jig body 4 is disposed on the near side in the pulley axial direction from the second pulley 11. . Further, the shift posture is such that the jig body 4 is locked to the pulley groove 9a of the front pulley 2a while the locking portion 6 is locked to the pulley flange 5b at the boundary between the front pulley 2a and the back pulley 2b of the first pulley 2. It is the posture arranged in.

  The jig body 4 is made of, for example, a synthetic resin and is a rectangular parallelepiped that is curved with substantially the same curvature as the groove bottom of the pulley groove 9a of the front pulley 2a of the first pulley 2. The jig body 4 has a length necessary to bend the belt 3 in the width direction without difficulty to get over the pulley flanges 5a and 5b, a width that fits in the pulley groove 9a, and a state in which the belt 3 is disposed in the pulley groove 9a. The thickness is set so as to slightly protrude from the pulley flange 5b at the boundary between the front pulley 2a and the back pulley 2b. Note that the jig body 4 can be formed of a metal such as iron or aluminum instead of the synthetic resin.

  The front end of the jig body 4 in the direction of pulley rotation is set to a smooth taper by making it thinner toward the front end. In the mounting position, the belt 3 is smoothly guided to the front side of the second pulley 11 and in the shift position. The belt 3 is smoothly run on the back surface of the jig body 4.

  The locking portion 6 is formed integrally with the jig main body 4 using, for example, a synthetic resin, so that the pulley flange 5a, the pulley flange 5a, It protrudes so as to be locked across 5b. In addition, with the jig body 4 disposed in the pulley groove 9a of the near-side pulley 2a, the locking portion 6 is formed in a shape straddling the boundary pulley flange 5b, so that the far-side pulley 2b than the near-side pulley 2a is formed. Even if the two-stage pulley 2 is set to have a large diameter, it can be mounted in a shift posture. In addition, the latching | locking part 6 can be formed from metals, such as iron and aluminum, instead of a synthetic resin.

  A protruding piece 10 is formed along the groove bottoms of the pulley grooves 9b and 12 at the rear end of the locking part 6, and the belt 3 that passes over the pulley flanges 5a and 5b presses the protruding piece 10 so that the belt The lifting of the mounting jig 1 is prevented.

  The protruding portion 7 is formed integrally with the jig main body 4 by, for example, a synthetic resin so as to protrude from the rear end portion in the pulley rotation direction of the jig main body 4. The belt 3 is prevented from coming off until it is attached to the belt 11. In addition, the protrusion part 7 can also be formed from metals, such as iron and aluminum, instead of a synthetic resin.

  The guide surface 8 has a slanted surface 8a formed at the rear end in the pulley rotation direction of the protruding portion 7 so as to become lower toward the back side, and a pulley rotation direction front end of the protrusion 7 so as to become lower toward the front side. And an inclined surface 8b formed between the inclined surface 8b and the inclined surface 8b so as to be lower toward the back side and the front side. As a result, the guide surface 8 causes the belt 3 to run smoothly in the shift posture, and shifts the belt 3 that has been climbed to the back pulley 2b.

  Next, a belt attachment method will be described. FIG. 3 is a side view and a right front view for explaining the first half of the belt attaching method. FIG. 4 is a side view and a left front view for explaining the latter half of the belt attaching method.

  In this method, the belt 3 is attached to the pulley groove 9 b of the back pulley 2 b of the first pulley 2 and the pulley groove 12 of the second pulley 11 having a smaller diameter than the first pulley 2. The first pulley 2 can have its front pulley 2a smaller in diameter than the rear pulley 2b, but in FIGS. 3 and 4, the front pulley 2a and the rear pulley 2b have the same diameter. It is shown as such.

  The belt 3 can be extended in the circumferential direction so as not to require tension adjusting means such as a tensioner. For example, the belt 3 has a structure in which a core wire made of polyamide is embedded in the belt body. The elongation is set to 2-3%. In addition, although the V-ribbed belt can be illustrated as the belt 3, belts other than V-ribbed belts, such as a flat belt, may be sufficient.

  The belt mounting method will be described in detail. First, as shown in FIG. 3A, the belt 3 is wound around the front pulley 2a of the first pulley 2, and the belt mounting jig 1 is wound around the second pulley 11. Is mounted in the mounting position. In order to mount the belt mounting jig 1 in the mounting posture, the locking portion 6 is locked to the pulley flange 5a on the front side of the second pulley 11 so that the back surface of the jig body 4 is moved to the second pulley 11. The pulley flange 5a on the near side is positioned on the radially outer side and on the near side in the pulley axial direction with respect to the outer peripheral surface of the pulley flange 5a.

  Further, in the pulley groove 12 of the second pulley 11, the belt 3 is fitted at a position behind the belt mounting jig 1 in the pulley rotation direction, and the belt 3 is bent in the belt width direction in the vicinity of the belt mounting jig 1. It straddles the pulley flange 5a on the front side. Further, the belt 3 is hung on the back surface of the jig body 4 while restricting the belt 3 from coming out toward the front side with the protruding portion 7, and more forward than the belt mounting jig 1 in the pulley rotation direction than the second pulley 11. Pass the belt 3 to the front side in the pulley axial direction. In this state, no tension is applied to the belt 3, and the belt 3 can be easily hung on the first pulley 2, the second pulley 11, and the belt mounting jig 1.

  Next, as shown in FIG. 3 (b), for example, a commercially available tool 14 is attached to the center bolt 13 of the first pulley 2 and the first pulley 2 is rotated, so that the belt 3 and the belt attachment jig 1 are interposed. The second pulley 11 is rotated. In this case, the second pulley 11 can be rotated via the belt 3, the first pulley 2 on the large diameter side is rotated as the driving side, and the second pulley 11 on the small diameter side is rotated as the driven side. The force required for this can be reduced.

  As the second pulley 11 rotates, the belt attachment jig 1 advances forward in the pulley rotation direction while the belt 3 is extended, and the range of the belt 3 that fits in the pulley groove 12 is expanded. Since the belt 3 is fitted in the pulley groove 12 behind the belt mounting jig 1 in the pulley rotation direction and the movement in the pulley axial direction is restricted, the restoring force of the belt 3 bent in the belt width direction is forward in the pulley rotation direction. Thus, a force for moving the belt 3 toward the pulley groove 12 acts. The restoring force of the belt 3 is a thrust force as a component force of the belt tension or an elastic force of the belt 3.

  The belt 3 moves radially outward from the vicinity of the center of the second pulley 11 in front of the belt mounting jig 1 in the pulley rotation direction, and gradually approaches the outer edge of the pulley flange 5a. At this time, since the belt 3 is wound around the front pulley 2a of the first pulley 2 and the belt 3 is positioned on the front side, the bolt 15 or the like protrudes from the front side surface of the second pulley 11. Even so, the belt 3 is not caught by the bolt 15 or the like.

  Eventually, the restoring force of the belt 3 causes the belt 3 to pass over the pulley flange 5a and slides into the pulley groove 12 from the jig body 4, and as shown in FIG. 11 is attached.

  After the belt 3 is completely attached to the second pulley 11, the second pulley 11 is further rotated, so that the belt attaching jig 1 is moved away from the belt 3 as shown in FIG. Therefore, the belt attaching jig 1 can be easily removed.

  Thereafter, as shown in FIG. 4 (e), the belt attachment jig 1 is reattached to the first pulley 2 in a shift posture, the first pulley 2 is rotated, and the belt 3 wound around the front pulley 2a is attached. It is made to ride on the jig body 4 and the protruding portion 7 while being extended. Here, in order to mount the belt mounting jig 1 in the shift posture, the locking portion 6 is locked to the pulley flange 5b at the boundary between the front pulley 2a and the back pulley 2b of the first pulley 2, The jig body 4 is disposed in the pulley groove 9a of the front pulley 2a.

  Further, as shown in FIG. 4 (f), for example, a commercially available tool 14 is attached to the center bolt 13 of the first pulley 2 to strongly rotate the first pulley 2. Thereby, the belt 3 riding on the back surface of the jig body 4 and the protruding portion 7 is further extended to increase the belt tension, and the portion of the belt 3 behind the belt mounting jig 1 in the pulley rotation direction is It is guided so as to slide on the guide surface 8 of the belt mounting jig 1 and is shifted to the pulley groove 9b of the back pulley 2b.

  As shown in FIG. 4 (g), by further rotating the first pulley 2, the range of the belt 3 shifted to the back pulley 2b gradually widens, and eventually the whole is shifted to the back pulley 2b. The

  After the belt 3 is completely shifted to the rear pulley 2b, the first pulley 2 further rotates, so that the belt mounting jig 1 moves to a position away from the belt 3 as shown in FIG. Therefore, the belt attaching jig 1 can be easily removed.

  In addition, this invention is not limited to said embodiment, A change can be suitably added within the scope of the present invention. For example, when the belt 3 is attached to the second pulley 11 by setting the front pulley 2a to be smaller in diameter than the rear pulley 2b, the first pulley 2 is wider in advance in a state where no belt tension is applied. The range can be fitted in the pulley groove 12 of the second pulley 11. As a result, the belt 3 is less likely to be caught on the front side surface of the second pulley 11, and the belt 3 can be more easily attached to the second pulley 11.

  In this case, even if the rear pulley 2b has a larger diameter than the front pulley 2a, the thickness of the jig main body 4 is set so as to protrude beyond the pulley flange 5b at the boundary, whereby the belt 3 Can be shifted to the rear pulley 2b.

  In addition to the first pulley 2, the belt attachment jig 1 and the belt attachment method of the present invention can also be employed when the second pulley 11 is a two-stage pulley. In this case, the belt 3 is wound around the front pulley 2 a of the first pulley 2, and the belt attachment jig 1 is attached to the second pulley 11, and once in the pulley groove of the front pulley of the second pulley 11. Attach the belt 3. Further, before or after shifting the belt 3 wound around the front pulley 2a of the first pulley 2 to the pulley groove 9b of the back pulley 2b, the belt attaching jig 1 is attached to the second pulley 11. The belt attached to the pulley groove of the front pulley of the second pulley 11 may be shifted to the pulley groove of the back pulley while rotating the second pulley 11.

The perspective view of the belt attachment jig which concerns on this invention It is a front view of the belt attachment jig with which it attached to the pulley, (a) shows an attachment posture, and (b) shows a shift posture. Side view and right front view for explaining the first half of the belt mounting method Side view and left front view for explaining the latter half of the belt mounting method A perspective view showing a conventional belt mounting jig

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Belt attachment jig 2 1st pulley 2a Front side pulley 2b Back side pulley 3 Belt 4 Jig body 5a, 5b Pulley flange 6 Locking part 7 Protruding part 8 Guide surface 8a, 8b, 8c Inclined surface 9a, 9b Pulley groove 10 Projection piece 11 Second pulley 12 Pulley groove 13 Center bolt 14 Tool 15 Bolt

Claims (8)

  A jig main body, a locking part for locking the jig main body to the pulley flange, a protruding part protruding from the jig main body to the back side, and a belt that can be extended in the circumferential direction on the rear side in the pulley axial direction A guide surface formed on the protruding portion to guide the belt, a mounting posture in which the belt is attached to the pulley groove on the pulley, and the belt is shifted from the front pulley of the two-stage pulley to the rear pulley. A belt mounting jig characterized in that it can be mounted with a shift posture. The jig body is set so that its width is smaller than the groove width of the pulley groove,
The locking portion can be locked to the pulley flange on the front side so that the jig main body is disposed on the front side of the pulley and the belt mounting jig is attached to the pulley in a mounting posture. It is possible to engage with a pulley flange at the boundary between the front pulley and the rear pulley so that the belt mounting jig is mounted on the pulley in a shift posture by being arranged in the pulley groove of the front pulley. Item 2. A belt mounting jig according to Item 1. In the mounting posture, the rear surface of the jig body is controlled while the belt protrudes to the near side with the protrusion until the belt slides on the jig body and fits into the pulley groove as the pulley rotates. Receiving a part of the belt and holding it on the radially outer side and the pulley axial direction front side of the outer peripheral surface of the pulley flange on the near side,
3. In the shift posture, the guide surface guides a belt riding on a back surface and a protruding portion of the jig main body to the pulley groove of the back pulley as the two-stage pulley is rotated. The belt mounting jig described in 1.   4. The belt mounting jig according to claim 1, 2, or 3, wherein the belt mounting jig can be mounted in a shift posture on a two-stage pulley in which a rear pulley is set to have a larger diameter than a front pulley. Among the plurality of pulleys including the first pulley and the second pulley, at least the first pulley is a two-stage pulley formed by juxtaposing the front pulley and the rear pulley in the pulley axial direction, A belt attachment method for attaching a belt that can be extended in the circumferential direction to the pulley groove of the back pulley of the first pulley together with the pulley groove of the pulley,
The belt is wound around the pulley on the front side of the first pulley, a belt attaching jig is attached to the second pulley, and the belt is attached to the pulley groove of the second pulley while rotating the second pulley, A belt mounting method comprising: mounting a belt mounting jig on the first pulley, and shifting the belt wound around the front pulley of the first pulley to the pulley groove of the back pulley while rotating the first pulley. .   The belt mounting method according to claim 5, wherein the first pulley has a front pulley set to have a smaller diameter than a back pulley.   6. When the belt is attached by attaching a belt attachment jig to the second pulley, the second pulley is rotated through the belt by rotating the first pulley wound around the belt. Or the belt attachment method of 6.   The second pulley is a two-stage pulley, once a belt attachment jig is attached to the second pulley, the belt is attached to the pulley groove of the front pulley, and the belt is wound around the front pulley of the first pulley. Before or after shifting the belt to the pulley groove of the rear pulley, attach a belt mounting jig to the second pulley and rotate the second pulley to the pulley groove of the front pulley of the second pulley. The belt attachment method according to claim 5, 6 or 7, wherein the attached belt is shifted to a pulley groove of a back pulley.

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