JP2001041265A - One-way clutch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a one-way clutch which is decreased in the number of parts and decreased in width in an axial direction. SOLUTION: A one-way clutch comprises an outer ring 2 having a cam surface formed on an inner peripheral surface; an inner ring 1; a plurality of rollers 3a and 3b situated between inner and outer rings; a holder 4 to hold rollers 3a and 3b in a pocket 5; and a spring to energize the rollers 3a and 3b in the direction of a cam surface. The pockets 5 of the holder 4 are formed in two trains 5a and 5b in an axial direction and the rollers 3a and 3b are held in the respective pockets 5a and 5b, and an inner ring 1 consists of first and second inner rings 1a and 1b corresponding to the respective trains of the rollers 3a and 3b. One inner ring 1a forms a fixed member, the other inner ring 1b forms a slide member sliding on one inner ring, and the outer ring 2 is formed in an integral shape corresponding to the roller trains 3a and 3b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a one-way clutch used for, for example, a tape winding device of a chip mounter.

[0002]

2. Description of the Related Art In a conventional tape winding device of a chip mounter, a winding lever and a tape winding reel are juxtaposed so as to be relatively movable, and a large number of ratchet grooves are formed around the reel. The reel feeding ratchet formed on the lever is designed to mesh with the lever feeding ratchet. Further, the main body is formed with a ratchet for preventing the reel from rotating in the reverse direction so as to mesh with the ratchet groove of the reel. The tape is wound on the reel. This winding is performed by the swinging motion of the lever. That is, the lever is moved in the tape winding direction. At this time, the feed ratchet of the lever is engaged with the ratchet groove of the reel, the reel is rotated by a predetermined distance, and the tape is fed. At this time, the ratchet for preventing reverse rotation of the reel fixed to the main body is caused to idle. After that, the lever rotates the feed ratchet idle and returns to the original position.At this time, the reverse rotation preventing ratchet engages with the ratchet groove of the reel, and the reel returns.
That is, the return of the tape is prevented. By repeating this operation, the tape is wound up on the reel.

[0003]

In the above conventional example, since the ratchet mechanism is used, the number of parts is large, and the apparatus cannot be downsized. Moreover, the noise generated by the ratchet mechanism is large.

For this reason, the applicant has abolished the ratchet mechanism, arranged two roller-type one-way clutches in parallel, and arranged one clutch on a winding lever and the other clutch on a tape winding reel. The ratchet mechanism was used to solve the problem of the ratchet mechanism. However, in this case, there were problems that the number of parts was increased and the size could not be reduced in the axial direction.

Accordingly, an object of the present invention is to provide a one-way clutch which has a small number of parts and can be made thinner in the axial direction.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has an outer ring having a cam surface formed on an inner peripheral surface, an inner ring, and a plurality of rings arranged between the inner and outer rings. Rollers, a retainer for holding each roller in a pocket,
In a one-way clutch having a spring for biasing each roller in the direction of the cam surface, the pockets of the retainer are arranged in two rows in the axial direction, the rollers are held in each pocket, and the inner ring corresponds to each row of rollers. The first inner race and the second inner race are constituted, the one inner race is a fixed member, the other inner race is a sliding member which slides on one inner race, and the outer race is an integral type corresponding to each roller row. It is characterized by the following.

[0007]

1 and 2 show one embodiment of the present invention. In a tape winding device of a chip mounter, a one-way clutch comprises an outer ring 2 having a cam surface formed on an inner peripheral surface; An inner ring 1, a plurality of rollers 3 disposed between the inner and outer rings 1 and 2, a retainer 4 for holding each roller 3 in a pocket 5, and a spring 7 for urging each roller 3 in a cam surface direction.
And basically.

The retainer 4 has two rows of pockets 5a and 5b formed in the axial direction.
Holds a first roller 3a and a second roller 3b. The spring 7 includes a base 7a having a predetermined length, and C-shaped projections 7b and 7c formed in the center of the base 7a. The base of the spring 7 is provided at the center of the retainer post 4a. 7a is fixed, and the first and second rollers 3a, 3b are urged in the direction of the cam surface of the outer ring 2 by the elastic force of the C-shaped protrusions 7b, 7c. That is, one of the C-shaped protrusions 7b urges the first roller 3a, and the other 7c of the protrusion urges the second roller 3b. The springs 7 having the above-described shape may be individually attached to the retainer 4 for each of the rollers 3a and 3b. However, by using the one spring 7, the one clutch can be shortened in the axial direction.

The outer race 2 has a shell-like two rows of rollers 3.
a and 3b are integrated. This allows
The roller track 2a formed on the outer race 2 is common to the two rows of rollers 3a and 3b. And this outer ring outer peripheral surface 2
b is fitted and fixed to the inner peripheral surface 10a of the tape winding reel 10.

Further, the inner ring 1 (the shaft in the embodiment) has a stepped first inner ring 1 a formed of a large diameter portion 8 and a small diameter portion 9, and a second inner ring 1 fitted to the small diameter portion 9. And the inner ring 1b. The outer peripheral surface of the first inner ring 1a is a track on which the first roller 3a rolls, and the outer peripheral surface of the second inner ring 1b is a track on which the second roller 3b rolls. The first inner ring 1a is fixed to a chassis 11 fixed to the body of the chip mounter with a screw 12 and the second inner ring 1b has an outer end fixed to a take-up lever 13. The first inner ring 1a and the second inner ring 1b are relatively rotatable. The first inner ring 1a
Is fixed to the end of the reel holder 14.

FIG. 3 shows another embodiment of the present invention. The first inner ring 1a (the shaft in the embodiment) in the embodiment of FIG. 1 is formed from the same diameter shaft, and the diameter of the first roller 3a rolling on the first inner ring 1a is increased. It is similar to the embodiment of FIG. According to the embodiment of FIG. 3, the load capacity is improved.

The one-way clutch of the present invention has the above-described configuration. Next, the operation of the one-way clutch will be described. In FIG. 1, the description will be made assuming that the feeding direction of the tape 15 is from the front surface to the rear surface of the paper and the cam surface of the outer ring 2 is also formed in the same direction. First, the take-up lever 13 is rotated by a predetermined distance in the direction of the back side of the drawing to take up the take-up lever 1.
The second inner ring 1b fixed to 3 is rotated, and the second roller 3b rolls in the direction of the cam surface and is locked. At this time,
The first roller 3a is also rolled in the cam surface direction and locked. Thereby, the take-up lever 13 and the take-up reel 10 are integrated by the clutch mechanism 14, the take-up reel 10 is rotated by a required distance, and the tape 15 on the take-up reel 10 is fed by a predetermined distance. Next, in order to feed the take-up reel 10, the take-up lever 13 is returned to the surface direction of the paper surface, that is, the original position. At this time
The inner ring 1b is rotated, the second roller 3b is separated from the cam surface, and the second roller 3b is released from the lock. At this time, the locked state of the first roller 3a is maintained because the first inner ring 1a is fixed. As a result, only the take-up lever 13 is returned to the original position, and the take-up reel 10,
That is, the tape 15 is maintained at the above-described feed position. Then, when the take-up lever 13 is moved again in the direction of the back surface of the paper, the second roller 3b is rotated with the rotation of the second inner ring 1b.
Is moved toward the cam surface and locked. And
When the take-up lever 13 is further rotated by a predetermined distance, the take-up lever 13 and the take-up reel 10 are integrated again by the clutch mechanism, and the take-up reel 10, ie, the tape 15, is fed by a predetermined distance. By this repetitive operation, the tape 15 can be fed intermittently.

[0013]

According to the present invention, an outer ring having a cam surface formed on an inner peripheral surface, an inner ring, a plurality of rollers disposed between the inner and outer rings, a retainer for holding each roller in a pocket, A one-way clutch having a spring for urging the rollers in the direction of the cam surface, wherein the retainer has two pockets in the axial direction, the rollers are held in each pocket, and the inner ring corresponds to each row of rollers. A first inner ring and a second inner ring, wherein the one inner ring is a fixed member, the other inner ring is a sliding member that slides on one inner ring, and the outer ring is an integral type corresponding to each roller row. Thereby, the number of parts can be reduced and the width can be reduced in the axial direction.

[Brief description of the drawings]

FIG. 1 is a half sectional view of an embodiment of the present invention.

FIG. 2 is a sectional view of the rolling bearing of FIG. 1;

FIG. 3 is a cross-sectional view of a rolling bearing according to another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Inner ring 1a 1st inner ring 1b 2nd inner ring 2 Outer ring 3 Roller 3a 1st roller 3b 2nd roller 4 Cage 5 Pocket 7 Spring

Claims (1)

[Claims] 1. An outer ring having a cam surface formed on an inner peripheral surface, an inner ring, a plurality of rollers disposed between the inner and outer rings, a retainer for holding each roller in a pocket, and a cam surface for each roller. A one-way clutch having a spring that biases in a direction,
The rollers of the cage are arranged in two rows in the axial direction, and the rollers are held in the pockets. The inner ring includes a first inner ring and a second inner ring corresponding to each row of the rollers. A one-way clutch, wherein the other inner ring is a sliding member that slides on the one inner ring, and the outer ring is an integral type corresponding to each roller row.