JP2000159396A - Winding unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a winding unit capable of making the thickness of a reel compact. SOLUTION: A driving one-way clutch 2 and a braking one-way clutch 3 are pressed in over the bore face of a reel 1 while being isolated from each other by a thin-walled washer 4 to avoid interference therebetween, thus forcing the one-way clutches 2, 3 to axially approach each other so that the thickness of the reel 1 can be made compact.

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. This is used for winding up a cover tape after transporting and supplying the tape in a tape pocket, and winding up a cleaner sheet that has cleaned a fixing unit of a copying machine or a printer.

FIGS. 3 and 4 show a winding unit used for winding the cover tape 31 after the semiconductor chips have been transported and supplied. In this winding unit, a one-way clutch 33 for driving and a one-way clutch 34 for braking are fitted on the inner surface of the reel 32, and the one-way clutch 33 for driving is a rotating sleeve 3 having a swing lever 35.
The one-way clutch 34 for braking is mounted directly on the shaft 37 via a stepped shaft 6. In addition,
The shaft 37 is fixed to a bracket 38 by bolts 39, and the rotating sleeve 36 is prevented from coming off by the bracket 38.

The swing lever 35 is intermittently swung by a predetermined rotation angle in accordance with the supply pitch of the semiconductor chips, as indicated by an arrow in FIG. At this time, the one-way clutch 33 for driving locks between the reel 32 and the rotating sleeve 36, and the reel 32
Together with the cover tape 31
Take up. When the cover tape 31 having a predetermined length is wound, the swing lever 35 is returned to its original position by the coil spring 40. At this time, the one-way clutch 34 for braking locks between the reel 32 and the shaft 37, Only the swing lever 35 and the rotating sleeve 36 return to their original positions.

In each of the one-way clutches 33 and 34, a plurality of cam surfaces inclined in the circumferential direction are provided on the inner diameter surfaces of the outer races 41 and 42, and rollers 43 and 44 are provided at positions opposed to the respective cam surfaces. Incorporated, these rollers 43,44
Springs 45, 46 in the direction in which
Is pressed. These one-way clutches 3
The reference numerals 3 and 34 are axially separated by a shoulder 47 provided on the inner surface of the reel 32 so that they do not interfere with each other.

[0006]

In the conventional winding unit described above, a shoulder is provided on the inner surface of the reel in order to prevent the two one-way clutches from interfering with each other.
Since the one-way clutch is separated in the axial direction, the axial thickness of the reel is increased by that amount, which hinders a reduction in the thickness of the reel.

It is an object of the present invention to provide a winding unit that can reduce the thickness of a reel.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides an outer ring having a plurality of circumferentially inclined cam surfaces on an inner diameter surface thereof. Rolling elements are incorporated, and these one-way clutches for driving and braking, which are pressed by springs in a direction in which the rolling elements are locked on the cam surface, are axially separated from each other and are separated from each other by the inner diameter surface of the reel. , The driving one-way clutch is mounted on a fixed shaft via a rotating sleeve having a swing lever, the braking one-way clutch is mounted on the fixed shaft, and the swing lever is swung. In the winding unit that intermittently rotates the reel by movement and winds the belt-like body, a configuration is adopted in which the one-way clutch for driving and braking is axially separated by a thin ring-shaped member. .

That is, the thickness of the reel can be reduced by separating the one-way clutch for driving and the one-way clutch for braking in the axial direction by a thin ring-shaped member.

The inner diameter surface of the reel has a straight shape with no step in the axial direction, and the outer diameters of the driving and braking one-way clutches are the same. And a concave portion extending in the axial direction is provided on the inner diameter surface of the reel. The convex portion extends in the axial direction by engaging with the concave portion of each one-way clutch. By forming each engaging portion with the one-way clutch at a different position in the circumferential direction, staggered convex portions formed at the boundaries of the engaging portions restrain axial movement of the reel in one direction. Even if the fitting between the outer race of the clutch and the reel is loose, the reel can be prevented from being displaced in the axial direction or falling off. Further, the shoulder of the inner diameter surface of the reel is not required, and the reel can be formed in a simple shape.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. This winding unit is used to wind up the cover tape after transporting and supplying the semiconductor chips, as in the winding unit shown in FIGS. 3 and 4, and as shown in FIG. A one-way clutch 2 for driving and a one-way clutch 3 for braking are press-fitted into the inner diameter surface of the resin-made reel 1 while being axially separated by a washer 4, and the one-way clutch 2 for driving is oscillated. The lever 5 is mounted on a shaft 9 fixed to a bracket 7 with bolts 8 via a rotary sleeve 6 integrally attached thereto, and the one-way clutch 3 for braking is directly mounted on the shaft 9. A grease reservoir 10 is provided between the inner diameter surface of the rotating sleeve 6 and the shaft 9 so that the rotating sleeve 6 can rotate smoothly. The swing of the swing lever 6 and the rotation of the reel 1 are the same as those of the winding unit shown in FIG.

Each of the one-way clutches 2, 3 is shown in FIG.
As shown in (a) and (b), the outer races 11 and 12
A plurality of cam surfaces 13 and 14 inclined in the circumferential direction are provided on the inner diameter surface of each of the rollers, and rollers 15 and 16 are incorporated at positions facing these cam surfaces 13 and 14, respectively.
The spring 16 is pressed by springs 17 and 18 in directions locked by the cam surfaces 13 and 14, respectively.

On the outer diameter surface of each of the outer races 11, 12, a plurality of recesses 19, 20 which are continuous in the axial direction are formed at a constant pitch in the circumferential direction. It is engaged with the convex portions 21 and 22 formed on the inner diameter surface,
It is stopped. As can be seen by comparing FIGS. 2A and 2B, each of the protrusions 21 and 22 on the inner diameter surface of the reel 1 is
The phases are shifted from each other, and the axial movement of the reel 1 is restricted by the phase shift at the boundary between the projections 21 and 22.

[0014]

As described above, in the winding unit of the present invention, the driving one-way clutch and the braking one-way clutch fitted on the inner diameter surface of the reel are axially separated by the thin ring-shaped member. Therefore, it is possible to design the reel to have a compact thickness. Also, the inner diameter surface of the reel is formed in a straight shape in the axial direction, and the outer diameter surfaces of the driving and braking one-way clutches are provided with axially continuous concave portions, respectively. Since the mating projections are formed at different positions in the circumferential direction, the axial movement of the reel is restrained, and even if the fit between the outer ring of the one-way clutch and the reel is loose, the reel is displaced in the axial direction or falls off. Can be prevented. Further, the shoulder of the inner surface of the reel is not required, and the reel can be formed in a simple shape.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a winding unit.

FIG. 2A is a cross-sectional view taken along the line AA of FIG. 1;
(B) is a sectional view taken along line BB in FIG.

FIG. 3 is a front view showing a conventional winding unit.

FIG. 4 is a sectional view taken along the line IV-IV in FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Reel 2, 3 One-way clutch 4 Washer 5 Swing lever 6 Rotating sleeve 7 Bracket 8 Bolt 9 Shaft 10 Grease reservoir 11, 12 Outer ring 13, 14 Cam surface 15, 16 Roller 17, 18 Spring 19, 20 Recess 21, 22 Convex part 31 Cover tape 32 Reel 33, 34 One-way clutch 35 Swing lever 36 Rotating sleeve 37 Shaft 38 Bracket 39 Bolt 40 Coil spring 41, 42 Outer ring 43, 44 Roller 45, 46 Spring 47 Shoulder

Claims (2)

[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 in the inner diameter surface of the reel while being axially separated from each other, and the one-way clutch for driving uses a swing lever. The one-way clutch for braking is mounted on the fixed shaft via a rotating sleeve having the one-way clutch, and the reel is intermittently rotated by the swinging of the swinging lever to take up the belt-like body. In the winding unit, the driving and braking one-way clutches are axially separated by a thin ring-shaped member. 2. The inner diameter surface of the reel has a straight shape with no step in the axial direction, the outer diameters of the driving and braking one-way clutches are the same, and the outer diameters of the outer rings of these one-way clutches. The surface is provided with a concave portion connected in the axial direction, and the inner diameter surface of the reel is provided with a convex portion that engages with the concave portion of each one-way clutch and extends in the axial direction. The winding unit according to claim 1, wherein each of the engagement portions with the one-way clutch for braking is formed at a different position in a circumferential direction.