JP2002096953A - Winding unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate operations by eliminating tension working on a strip during replacement of a reel in a winding unit for winding the strip through the intermittent rotation of the reel, the unit having a driving one-way clutch and a braking one-way clutch both assembled to the inside diameter surface of the reel. SOLUTION: In the winding unit, a spring type torque limiter 18 is interposed between the respective outer wheels 12 and 12' of the driving one-way clutch 9 and the braking one-way clutch 11 and a reel boss portion 52. When the torque limiter 18 is rotated in winding direction, a coil spring 27 is locked to transmit torque. When the torque limiter 18 is forcibly rotated in the direction opposite to the winding direction, a slip occurs and the tension applied to a cover tape 39 is eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a winding unit for intermittently winding a band such as a tape.

[0002]

2. Description of the Related Art A winding unit of this kind is used for winding a belt-like body fed from an intermittently operating processing step in accordance with the operating pitch of the processing step. Is used to wind up a cover tape (also referred to as a top tape) after transporting and feeding it in a tape pocket, and to wind up a cleaner sheet that has cleaned the fixing unit of a copying machine or a printer. I have.

FIGS. 24 and 25 show a winding unit used for winding the cover tape 60 after the semiconductor chip has been transported and supplied. The reel 61 of the winding unit includes a support reel 62 and a reel boss 62 ′.
The cover tape 60 is wound around the removable reel 78. A one-way clutch 63 for driving and a one-way clutch 64 for braking are fitted on the inner diameter surface of the reel boss 62 ′, and the one-way clutch 63 for driving is stepped via a rotating sleeve 66 having a swing lever 65. Is mounted on the fixed shaft 67. On the other hand, a one-way clutch 64 for braking
Is mounted directly on the fixed shaft 67.

The fixed shaft 67 is fixed to a bracket 68 fixed to a base 79 (see FIG. 24) with bolts 80, and the rotating sleeve 66 is prevented from falling off by the bracket 68.

[0005] The swing lever 65 is moved in accordance with the supply pitch of the semiconductor chip as shown by an arrow A in FIG.
It is swung intermittently by a predetermined rotation angle. At this time, the one-way clutch 63 for driving is connected to the reel boss 6.
2 ′ and the rotating sleeve 66 are locked, and the support reel 62 is locked.
Rotates with the rotating sleeve 66 by a predetermined rotation angle, and winds the cover tape 60 around the reel 61. When the cover tape 60 having a predetermined length is wound, the swing lever 65 is returned by the coil spring 70. At this time, the one-way clutch 64 for braking locks the space between the reel boss 62 ′ and the fixed shaft 67, and rotates the swing lever 65 and the rotating sleeve 66.
Only returns to its original position.

In each of the one-way clutches 63 and 64, a plurality of circumferentially inclined cam surfaces are provided on the inner diameter surfaces of the outer races 71 and 72, and rollers 73 and 74 are provided at positions facing the respective cam surfaces. These rollers 73, 74
Springs 75, 76 in the direction in which
Is pressed. These one-way clutch 6
3, 64 are axially separated by shoulders 77 provided on the inner diameter surface of the reel boss 62 'so that they do not interfere with each other.

[0007]

In the above-described winding unit, when the winding amount of the cover tape 60 on the reel 61 becomes full, it is necessary to remove the detachable reel 78 from the support reel 62 and replace it. .

However, since the support reel 62 is braked by the one-way clutch 63 for braking and cannot be reversed, the tension at the time of winding is still applied to the cover tape 60, and it becomes difficult to remove the detachable reel 78. .

Accordingly, an object of the present invention is to make it possible to release the tension of the cover tape 60 by allowing the reel 78 to rotate in the reverse direction when the detachable reel 78 is replaced.

[0010]

In order to solve the above-mentioned problems, the present invention provides a plurality of cam surfaces inclined in a circumferential direction on an inner diameter surface of an outer ring, and a plurality of cam surfaces are provided at positions opposed to these cam surfaces. Rolling elements are incorporated, and one-way clutches for driving and braking, which are pressed by springs in a direction in which these rolling elements are locked on the cam surface, are fitted into the inner diameter surface of the reel boss portion, and the driving A one-way clutch is mounted on a fixed shaft via a rotating sleeve having a swing lever, the one-way clutch for braking is mounted on the fixed shaft, and the reel is intermittently rotated by the swing of the swing lever. In the winding unit for winding the belt-like body, a torque limiter is interposed between the outer ring and the reel boss portion, and the torque limiter applies a force to the reel boss portion in a forcibly anti-winding direction. It is obtained so as to cut off the transmission to the outer ring of the torque.

[0011] According to the above configuration, the torque limiter performs winding without slipping in any of the intermittent winding cycle and the intermittent rest period of the belt-like body.
In addition, the belt maintains a constant tension by the action of the one-way clutch for braking. When it is necessary to release the tension of the band when replacing the reel, for example, if the reel is forcibly rotated in the anti-winding direction, the reel rotates while sliding with respect to the outer ring, and the tension of the band is removed. Cancel.

[0012] More specifically, the torque transmitter is
It is set to have a sufficiently large winding torque value for transmitting torque in the winding direction from the outer race to the reel boss portion, and has a predetermined magnitude for transmitting torque in the anti-winding direction from the reel boss portion to the outer race. This has a configuration set so as to have an anti-winding torque value.
When the reel boss is forcibly rotated with a torque exceeding the above-described anti-winding torque value, the slippage occurs.

As a more specific configuration, the torque limiter has a torque limiter ring fitted to the outer diameter surface of the outer ring, and is mounted on the outer diameter surface of the torque limiter ring with a predetermined binding force. A coil spring, wherein one end of the coil spring is engaged with the reel boss portion, and the binding force of the coil spring increases due to the rotation of the torque limiter ring in the winding direction. And the rotation of the reel boss in the anti-winding direction reduces the binding force so as to have a predetermined anti-winding torque value.

Further, it is possible to adopt a structure in which a restraining means for the coil spring is provided on the reel boss portion, and the circumferential movement of the one end of the coil spring is prevented by the restraining means. According to this configuration, when the swing lever is rotated to take up the reel, the movement of the coil spring with respect to the reel boss is prevented by the restraining means, and the swing angle of the swing lever and the reel match. I do.

Further, the other end of the coil spring is engaged with a lid member fitted to the end of the torque limiter ring, and the lid member is operated to adjust and change the set torque value.

[0016] The torque limiter may be a press-fit type torque limiter having a press-fitting structure of the torque limiter ring and the reel boss portion.

Further, the torque limiter is a cam type torque limiter, and the cam type torque limiter includes a cam recess provided on a fitting surface of one of the torque limiter ring and the reel boss. In the other member, it is possible to adopt a configuration including a rolling element housed in a pocket provided opposite to the cam recess, and an elastic member for urging the rolling element against the cam recess.

As a more specific configuration of the cam type torque limiter, the torque limiter ring has a rolling element holding portion sandwiching an annular elastic body receiving portion radially outward, and the rolling element holding portion is provided. The above-mentioned pockets are provided at a plurality of positions in the circumferential direction of the portion in the radial direction, and the rolling elements housed in each pocket are supported by applying a biasing force outward by a single elastic body housed in the elastic body housing portion. The configuration can be adopted. According to this configuration, since the elastic body is formed of a single member, the number of parts is reduced.

[0019]

Embodiments of the present invention will be described below with reference to the accompanying drawings. In the winding unit according to the first embodiment shown in FIGS. 1 to 4, a fixed shaft 1 is fixed to a bracket 3 by bolts 2. The fixed shaft 1 is provided with a step portion 4 in the middle, a small diameter portion 5 between the bracket 3 and the step portion 4, and a large diameter portion 7 from the step portion 4 to the flange portion 6 at the tip. A rotating sleeve 8 with a flange is rotatably fitted to the outer diameter surface of the small diameter portion 5. The rotary sleeve 8 has the same outer diameter as the large diameter portion 7.

A one-way clutch 9 for driving is fitted on the outer diameter surface of the rotary sleeve 8, and a one-way clutch 11 for braking is fitted on the large-diameter portion 7 of the fixed shaft 1.

The one-way clutch 9 for driving includes an outer race 12
As shown in FIG. 2, pockets 14 are formed at regular intervals in the circumferential direction on the inner surface of the outer race 12, and a roller 14 is formed on the bottom surface of the pocket 14. A cam surface 15 inclined in the direction is formed. The cam surface 15 and the outer diameter surface of the rotating sleeve 8 facing the cam surface 15 form a wedge-shaped cavity that becomes narrower in the rotation direction (see arrow A) when the rotating sleeve 8 is wound. The rollers 13 are inserted into the rollers. A recess 16 is provided at the widened end of the wedge-shaped cavity, and the recess 16
One end of the spring 17 housed in the above is pressed against the roller 13 to urge the roller 13 in the narrow side of the wedge-shaped space, that is, in the locking direction.

The one-way clutch 11 for braking has substantially the same structure except that the width in the axial direction is slightly smaller than the one-way clutch 9 for driving (see FIG. 1). Only the same reference numerals are shown with dashes (see FIG. 3), and the description thereof is omitted.

A washer 10 is interposed between the outer races 12, 12 'of the two-way clutches 9, 11 and between the rollers 13, 13' to prevent mutual interference. Each of the outer rings 12, 12 'is formed to have the same outer diameter, and a torque limiter ring 19 constituting a part of a torque limiter 18 is fitted and fixed to the outer diameter surface (see FIG. 1). An inner diameter surface of a support reel 22 forming a reel 23 is rotatably fitted to a counterbore 21 provided at an inner end of the torque limiter ring 19. Further, an annular lid member 24 is fitted with a predetermined fitting resistance to a counterbore 21 ′ provided at the outer end. Instead of the washer 10, a ridge is provided on the inner surface of the trim limiter ring 19, whereby the outer ring 12 is provided.
And 12 'and between rollers 13 and 13'. The same applies to other embodiments described below.

A swing lever 20 is fixed to the flange of the rotary sleeve 8 between the reel 23 and the bracket 3.

The support reel 22 has a reel boss 25
On the outer diameter surface of the reel boss 25, a detachable reel 30 having an L-shaped cross section is prevented from rotating in the circumferential direction and is detachably attached in the axial direction. The reel boss 25
A spring housing space 26 is formed between the torque limiter ring 19 and the torque limiter ring 19, and the coil spring 27 of the torque limiter 18 is housed in the space 26. The coil spring 27 has a small diameter portion 28 and a large diameter portion 29, and the small diameter portion 28 is wound around the outer diameter surface of the torque limiter ring 19 with a predetermined binding force. A hook 31 provided at one end of the small diameter portion 28 is engaged with the reel body 22. A hook 32 provided at one end of the large diameter portion 29 is provided.
Are engaged with the lid member 24.

The coil spring 27 is provided on the swing lever 20.
When the rotary sleeve 8 is rotated in the rotation direction (see the arrow A in FIG. 2) in the case where it is rotated in the winding direction, the force in the diameter reduction direction due to the rotation of the small diameter portion 28 of the coil spring 27 acts, and The force increases and the lock state is established. That is, the torque value in the winding direction is set to an extremely large value.

On the other hand, when the reel body 22 is rotated in the anti-winding direction (see the arrow B in FIG. 2), the coil spring 27
The force in the diameter-expanding direction acts on the small-diameter portion 28, and the binding force is reduced. That is, the torque value in the anti-winding direction is set to a predetermined value smaller than the torque value in the winding direction. However, the torque value is set to be larger than the torque in the anti-winding direction due to only the tension of the belt acting on the reel 23.

In FIG. 1, reference numeral 33 denotes a grease pool.

The winding unit according to the first embodiment is as described above, and its operation will now be described.

FIG. 4 shows an example of the use, in which the semiconductor tape 38 is transported by the transport tape 37 laid on the base 36 and the cover tape 39 is wound on the reel 23 of the winding unit. I have.

Now, when the swing lever 20 is swung by a predetermined angle in the winding direction (see the arrow A in FIG. 4), the rotary sleeve 8 rotates in the winding direction (see the arrow A in FIG. 2), and the drive The one-way clutch 9 is locked, and the torque is transmitted to the torque limiter ring 19 via the outer ring 12. As described above, the torque value of the torque limiter 18 in the winding direction is set to an extremely large value, and the winding torque of the reel 23 is not so large. Therefore, the torque limiter 18 transmits the torque without causing slippage. . Thereby, the winding of the cover tape 39 on the reel 23 is performed.

When the swing lever 20 swings in the returning direction, the reel 2 is actuated by the operation of the one-way clutch 11 for braking.
3 enters a rest period, but the lock of the driving one-way clutch 9 is released, so that the rotating sleeve 8 rotates freely and returns to the original state.

On the other hand, in the above-mentioned rest period, the reel 2
3 receives a torque in the anti-winding direction (see the arrow B in FIG. 2) due to the tension of the cover tape 39 wound thereon. However, as described above, the torque limiter 18
Is set to be larger than the torque in the anti-winding direction caused only by the tension of the cover tape 39 acting on the reel 23, so that no slip occurs. Thus, the tension of the cover tape 39 wound on the reel 23 is kept constant.

By repeatedly swinging the swing lever 20 as described above, the reel 23 is
9 is wound up intermittently. When the take-up amount is full and the detachable reel 30 is to be replaced, the cover tape 39 may be used.
When it is necessary to release the tension of
3 is forcibly rotated in the anti-winding direction by the operator's hand. When the rotation torque exceeds the torque value of the torque limiter 18 in the anti-winding direction, slip occurs, causing the reel 23 to rotate in the reverse direction, causing the cover tape 39 to loosen (see the dashed line in FIG. 4).

The adjustment of the torque value of the torque limiter 18 is performed by rotating the lid member 24 and changing the binding force of the small diameter portion 28 through the large diameter portion 29 of the coil spring 27.

Next, the second embodiment shown in FIG. 5 is similar to the first embodiment described above except that the outer rings 12, 12 'of the one-way clutches 9, 11 for driving and braking, and the torque limiter 1
8 and the torque limiter ring 19 are integrated to provide an integrated outer ring 12a, and the integrated outer ring 12a combines the functions of these members.

According to the above configuration, the operation as the winding unit is the same as that of the first embodiment, but the number of parts can be reduced and the one-way clutches 9, 11 and the torque limiter can be reduced in the assembling process. The unit 18 and the support reel 22 can be unitized.

The third embodiment shown in FIG.
In the case of the embodiment, the large diameter portion 29 of the coil spring 27 of the torque limiter 18 is omitted, and only the small diameter portion 28 is configured. With such a configuration, the width of the adjustment change of the torque value is reduced, but the configuration of the coil spring 27 is simplified.

The fourth embodiment shown in FIG.
While adopting the integrated outer ring 12a as in the embodiment,
Coil spring 2 having only a small diameter portion similar to the third embodiment
7 is used.

The fifth embodiment shown in FIG.
Instead of the coil spring 27 of the embodiment (see FIG. 6), a plurality (two in the illustrated case) of coil springs 27a, 27a are mounted on the outer peripheral surface of the torque limiter ring 19 so as to be arranged in the axial direction. Each coil spring 27a is provided with the small-diameter portion 2 described above.
Hooks 31 a protruding radially outward are provided on the coil portion corresponding to 8, and each hook 31 a is locked in a locking groove 40 provided in the inner surface of the reel boss portion 25 in the axial direction. According to this configuration, the torque value can be set to twice the torque value of the single coil spring 27a.

As shown in FIG. 9, there is a slight gap a in the circumferential direction between each hook 31a of the coil springs 27a, 27a and the locking groove 40, so that the hook 31a can be easily inserted. I can do it. However, when the gap a is present, when the swing lever 20 is driven to wind the cover tape 39 around the reel 30, the coil springs 27a move in the circumferential direction within the range of the gap a (rattle). Therefore, the reel 2 with respect to the rotation of the swing lever 20
As a result, the rotation of the reel 23 becomes insufficient. In order to prevent this insufficient rotation, the following measures can be taken to restrain each coil spring 27a and prevent its movement.

The first countermeasure is to eliminate the gap between the locking groove 40 and each hook 31a by pressing each hook 31a into the locking groove 40 as shown in FIG. It is. In this case, the guide surface 4 by chamfering is formed on the axially open end of the locking groove 40 as shown in FIG.
0 'is formed to facilitate incorporation.

As a second countermeasure, as shown in FIG. 11, protrusions 41 are provided at three locations in the circumferential direction on the inner diameter surface of the reel boss portion 25, and the outer circumferential surface of the coil spring 27a is brought into contact with the protrusions 41, and the friction is used. The coil spring 27a is restrained from the outer peripheral side. In addition to or separately from this structure, a structure (not shown) in which one coil spring 27a is brought into contact with the inner end surface of the support reel 22 and the other coil spring 27a is brought into contact with the lid member 24 can be adopted.

Third, as shown in FIG. 12, hooks 31a and 31b are provided at both ends of each coil spring 27a, and the hooks 31a and 31b are brought close to each other for finishing. Reel boss 2
5, two rows of locking grooves 40a and 40b are formed on the inner surface, and a rib 40c is formed between the locking grooves 40a and 40b. The distance between the hooks 31a and 31b is smaller than the width of the rib 40c. The hooks 31a and 31b are pushed and spread to both sides (see the arrow in FIG.
0c with a predetermined spring force. Thereby, each coil spring 27a is restrained.

Incidentally, both corner portions at the end of the rib 40c are chamfered to form guide surfaces 42, 42.

Next, a sixth embodiment shown in FIG. 13 uses a press-fit type torque limiter 18a in place of the spring type torque limiter 18 in the first embodiment. That is, the torque limiter ring 19 is mounted on the reel boss 2
The torque limiter ring 19 is prevented from coming off by the lid member 24 which is press-fitted on the inner diameter surface of the reel 5 and engaged with the end of the reel boss 25.

Although the torque values in the winding direction and the anti-winding direction of the press-fit type torque limiter 18a are the same,
The size is set to be larger than the winding torque of the reel 23 so as to prevent slippage during winding. Further, the torque value is set to a torque value larger than the torque in the anti-winding direction due to the tension of the cover tape 39 in the pause period of the intermittent winding.

Therefore, in order to release the tension of the cover tape 39, a torque larger than the above-described torque value in the anti-winding direction may be applied to the reel 23 in the anti-winding direction.

The seventh embodiment shown in FIG. 14 is similar to the above-described fifth embodiment in the case of the above-described fifth embodiment.
2a.

The eighth embodiment shown in FIGS. 15 and 16 replaces the spring-type torque limiter 18 of the first embodiment or the press-fit type torque limiter 18a of the sixth embodiment. Cam type torque limiter 18b
Is used.

The cam type torque limiter 18b is provided with a cam concave portion 43 having a conical cross section at two symmetrical locations on the inner surface of the reel boss 25 (see FIG. 16A). Pockets 44 are provided at two symmetrical positions on the outer diameter surface of the limiter ring 19. An elastic body 45 made of a coil spring and a rolling body 46 such as a ball supported by the elastic body 45 are housed inside the pocket 44, and a part of the rolling body 46 is urged by the elastic body 45 in a normal state. In this state, it is fitted into the cam recess 43. The above cam recess 43
The pocket 44 is closed by the lid member 24.

The cam type torque limiter 18b has the same torque value in the winding direction A and the anti-winding direction B, but its magnitude is set larger than the winding torque of the reel 23. Elasticity, cam recess 4
By selecting the depth 3, the taper angle of the cam recess 43, and the like, slippage does not occur during winding. Further, the cover tape 39 is not provided during the intermittent winding pause cycle.
Is set to a torque value larger than the torque in the anti-winding direction due to the tension of.

Accordingly, when the tension of the cover tape 39 is released, a torque larger than the torque value in the above-described anti-winding direction is applied to the reel 23 in the anti-winding direction B, as shown in FIG. As described above, the rolling element 46 escapes from the cam recess 43 to cause idling, and the tension of the cover tape 39 is released.

Contrary to the above, the positions of the cam recess 43 and the pocket 44 may be such that the cam recess 43 is provided on the torque limiter ring 19 and the pocket 44 is provided on the reel boss 25 (FIG. 17A). )reference). FIG.
As shown in FIG. 7 (b), if the shape of the cam recess 43 is formed to be asymmetric, the inclination angle in the anti-winding direction B side is small, and the inclination angle in the winding direction A side is large. The escape torque of the rolling element 46 during take-up is large, and the escape torque during anti-winding can be made smaller than this.

Further, as shown in FIG. 17C, the circumferential distance between the cam recess 43 and the pocket 44 facing the cam recess 43 is, for example, such that the cam recesses 43 are provided at intervals of 30 ° in the circumferential direction, and the pockets 44 are formed. The former may be provided at a predetermined ratio more than the latter, for example, provided at 90 ° intervals.

The cam type torque limiter 18b as described above.
Is used, the outer peripheral surface of the reel boss portion 25 is fitted over the entire length in the axial direction, so that the support reel 22 is stably supported in the axial direction. For this reason, the axial deflection of the reel 23 is reduced, and the winding accuracy is increased.

As a modification of the above-mentioned elastic body 45,
As shown in FIG. 18A, a leaf spring bent in a U-shape can be used. Further, as shown in FIGS. 18B and 18C, the elastic body 45 may be formed by projecting a spring piece 48 outwardly from an annular plate 47. The annular plate 47 is sandwiched between the end surface of the torque limiter ring 19 and the lid member 24, and the spring piece 48 is bent and fitted into the pocket 44 to support the rolling element 46.

In the modification shown in FIGS. 19A, 19B and 19C, rollers are used as the rolling elements 46. Further, the elastic body 45 is provided with a coil spring (a
FIG.), A U-shaped leaf spring (FIG. B) and an annular plate 47 with a spring piece 48 (FIG. C) can be used.

In the ninth embodiment shown in FIGS. 20A and 20B, a cam recess 34 is provided on the inner surface of the lid member 24 at a predetermined interval in the circumferential direction, and a torque limiter ring facing the recess is provided. On the end face of the 19, the number of pockets 44 smaller than the number of the cam recesses 34 is provided. In the same manner as described above, the elastic body 45 and the rolling element 46 made of a coil spring are housed in the pocket 44, and the rolling element 46 is urged toward the cam recess 34. In this case, a D-shaped notch 49 for preventing rotation is provided in the opening of the lid member 24 and the reel boss 25 where the lid member 24 is fitted and the lid member 24. Notch 4
9, the lid member 24 is integrated with the reel boss 25. Also in this case, a U-shaped spring can be used as the elastic body 45.

In the above embodiment using the cam type torque limiter 18b, the pocket 44
In the tenth embodiment shown in FIGS. 21 to 23, the rolling elements 46 are housed in the respective pockets 44. However, in the tenth embodiment shown in FIGS. 45 is formed by a single component housed in an elastic body housing 53 common to each pocket 44. That is, as shown in FIG. 21, the torque limiter ring 19 in this case has a closing portion 51 corresponding to the lid member 24 of each of the above-described embodiments on the outer diameter surface of one end thereof. It has a cylindrical rolling element holding portion 52 that extends inward (see FIG. 23). The rolling elements 46 are rollers, and pockets 44 for accommodating the rolling elements 46 are provided at three locations in the circumferential direction of the rolling element holding portion 52 (see FIG. 22).

An elastic space 53 is formed between the torque limiter ring 19 and the rolling element holder 52 in an annular space. The elastic body 45 stored in the elastic body storage section 53 is
A metal plate is bent into a C shape, and a protrusion 5 provided at one end thereof is provided.
4 is provided. The projecting piece 54 is
By locking in the locking recess 55 provided on the inner surface of
The circumferential rotation is prevented while elastic deformation in the radial direction is allowed. The elastic body 45 is disposed along the inside of the three pockets 44 and abuts against the rolling elements 46 to apply an outward biasing force. A part of the rolling element 46 is fitted into the cam recess 43 provided on the reel boss 25 with a predetermined urging force, as in the above-described embodiments. Other configurations and operations are the same as those in the above-described embodiments.

[0062]

As described above, according to the present invention, in the winding unit for a belt-shaped body, the reel is forcibly rotated in the anti-winding direction with a predetermined torque or more as necessary when replacing the reel. Thereby, the tension of the belt-shaped body wound on the reel can be released, and required slack can be imparted. This facilitates operations such as reel replacement.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a first embodiment.

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a side view of the usage state of the above.

FIG. 5 is a sectional view of a second embodiment.

FIG. 6 is a sectional view of a third embodiment.

FIG. 7 is a sectional view of a fourth embodiment.

FIG. 8 is a sectional view of a fifth embodiment.

9 is a sectional view taken along line IX-IX in FIG.

10A is a sectional view of a modification of the fifth embodiment; FIG. 10B is an enlarged sectional view taken along line bb in FIG. 10A;

FIG. 11 is a sectional view of another modification of the above.

12A is a cross-sectional view of another modification of the above embodiment, and FIG. 12B is an enlarged cross-sectional view taken along line bb in FIG.

FIG. 13 is a sectional view of the sixth embodiment.

FIG. 14 is a sectional view of the seventh embodiment.

FIG. 15 is a sectional view of the eighth embodiment.

16 (a) is a cross-sectional view taken along the line XVI-XVI in FIG.

17A to 17C are partial cross-sectional views of a modification of the above.

FIG. 18 (a) is a partial cross-sectional view of a modification of the elastic body according to the above.

FIG. 18 (b) is a partial cross-sectional view of a modification of the above elastic body.

FIG. 18 (c) is a partial cross-sectional view of a modification of the elastic body according to the above.

FIG. 19 (a) is a partial cross-sectional view of a modified example of the rolling element of the above.

FIG. 19 (b) is a partial sectional view of a modified example of the rolling element of the above.

FIG. 19 (c) is a partial sectional view of a modification of the rolling element of the above.

20A is a cross-sectional view of the ninth embodiment. FIG. 20B is a cross-sectional view taken along line bb in FIG.

FIG. 21 is a sectional view of a tenth embodiment.

FIG. 22 is a sectional view taken along the line XXII-XXII of FIG.

FIG. 23 is a partial perspective view of the above.

FIG. 24 is a front view of a conventional example in use.

FIG. 25 is a longitudinal sectional side view of the above.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fixed shaft 2 Bolt 3 Bracket 4 Step part 5 Small diameter part 6 Collar part 7 Large diameter part 8 Rotating sleeve 9 One-way clutch 10 Washer 11 One-way clutch 12, 12 'Outer ring 12a Integrated outer ring 13, 13' rollers 14, 14 'Pocket 15, 15' Cam surface 16, 16 'Concave portion 17, 17' Spring 18, 18 'Torque limiter 18a Press-fit type torque limiter 18b Cam type torque limiter 19, 19' Torque limiter ring 20 Swing lever 21, 21 ' Counterbore part 22 Support reel 23 Reel 24 Cover member 25 Reel boss part 26 Void 27 Coil spring 27a Coil spring 28 Small diameter part 29 Large diameter part 30 Removable reel 31 Hook 31a Hook 32 Hook 33 Grease pool 36 Base 37 Transport tape 38 Semiconductor Tip 39 Cover tape 4 Locking groove 40 'Guide surface 41 Projection 42 Guide surface 43 Cam recess 44 Pocket 45 Elastic body 46 Rolling element 47 Annular plate body 48 Spring piece 49 Notch section 51 Closed part 52 Rolling element holding part 53 Elastic body storage part 54 Projection piece 55 locking recess

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Masayuki Ishida 3066 Oyumida, Oaza, Touhou, Kuwana-shi, Mie F-term in NTN Corporation (reference) 2H033 AA36 BA51 3F104 AA03 DA01

Claims (8)

[Claims] A plurality of cam surfaces inclined in the circumferential direction are provided on an inner diameter surface of an outer race, and rolling elements are incorporated at positions facing the respective cam surfaces, and these rolling elements are locked by the cam surfaces. One-way clutches for driving and braking, which are pressed by springs in the directions shown, are fitted on the inner surface of the reel boss portion, and the one-way clutch for driving is attached to the fixed shaft via a rotating sleeve having a swing lever. A winding unit that is mounted, the one-way clutch for braking is mounted on the fixed shaft, and the reel is intermittently rotated by the swing of the swing lever to wind the belt-like body, and the outer ring and the reel boss portion are provided. A torque limiter is interposed between the outer ring and the torque limiter to shut off transmission of rotational torque applied to the reel boss portion in the forced anti-winding direction to the outer ring. And take-up unit. 2. The torque limiter is set to have a winding torque value large enough to transmit torque in a winding direction from the outer race to the reel boss, and a torque limiter from the reel boss to the outer race. The winding unit according to claim 1, wherein the torque transmission in the winding direction is set so as to have a predetermined magnitude of an anti-winding torque value. 3. The torque limiter comprises: a torque limiter ring fitted on an outer diameter surface of the outer ring; and a coil spring mounted on the outer diameter surface of the torque limiter ring with a predetermined binding force. A spring-type torque limiter in which one end of the coil spring is engaged with the reel boss portion, wherein the coil spring locks with an increased binding force due to rotation of the torque limiter ring in a winding direction; The winding unit according to claim 1, wherein the rotation of the reel boss in the anti-winding direction reduces the binding force and has a predetermined anti-winding torque value. 4. A method according to claim 1, wherein said reel boss is provided with restraining means for said coil spring, and said restraining means prevents said coil spring from moving in a circumferential direction of said one end. The winding unit described in Crab. 5. The winding unit according to claim 3, wherein the other end of the coil spring is engaged with a lid member fitted to an end of the torque limiter ring. 6. The winding unit according to claim 1, wherein said torque limiter is a press-fit type torque limiter having a press-fitting structure of said torque limiter ring and said reel boss portion. 7. The torque limiter is a cam type torque limiter, the cam type torque limiter includes a cam recess provided on a fitting surface of one of the torque limiter ring and the reel boss. 2. The rolling member according to claim 1, wherein the other member includes a rolling element housed in a pocket provided to face the cam recess, and an elastic member for urging the rolling element against the cam recess. Winding unit. 8. The torque limiter ring has a rolling element holding portion sandwiching an annular elastic body receiving portion radially outward, and the pockets are radially provided at a plurality of circumferential positions of the rolling element holding portion. The rolling element housed in each pocket is supported by applying a biasing force outward by a single elastic body housed in the elastic body housing part. Winding unit.