JPH11132228A - Rolling bearing for oscillating shaft - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the uneven abrasion of the rolling bearing roller of an oscillating shaft. SOLUTION: Large- and small-diameter one-way clutches 11 and 12, having different rotation directions, are fitted at the same roatation center, to the rolling bearing 20 of a housing 3a arranged in a bite barrel; also the small- diameter one-way clutch 12 is fitted to the inner peripheral part of the large- diameter one-way clutch 11. The large- and small-diameter clutches 11 and 12 allow only in counterclockwise and clockwise directional rotations respectively to the housing 3a. An oscillation shaft 4 is assembled in its inserted condition into a hole provided in the inner peripheral part of the small-diameter one-way clutch 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling bearing for a rocking shaft, which is provided on a shaft of a rocking arm or the like and repeats normal rotation and reversal within a predetermined angle.

[0002]

2. Description of the Related Art An axis constituting the center of rotation (oscillation) of an oscillating arm, that is, an axis that repeats normal rotation and reversal within a predetermined angle (hereinafter referred to as an oscillating axis) is used in various devices. Has been adopted. For example, in a printing-related rotary press,
A biting device provided on the biting cylinder, a claw device provided on the reduction drum,
It is provided in a folding blade device or the like provided in the folding cylinder. 5 and 6 show a biting device provided in a conventional biting cylinder (cylinder) 1 among them. As shown in the figure, a pair of frames 7a, 7b
A cylindrical housing 6 is fixed to each of the frames 7a and 7b. The housing 6 has a cam 8 fixed on the outer peripheral surface thereof, and the inner peripheral surface thereof supports the rotary shaft 1a of the biting cylinder 1 via a bearing 5.

A predetermined notch groove 2 is formed on the outer peripheral surface of the biting cylinder 1 along the axial direction, and a pair of housings 3a and 3b are fixed to both ends in the longitudinal direction. The support arms 17 are provided on the housings 3a and 3b via rolling bearings 16 such as ball bearings and needle bearings.
The rocking shaft 4 to which is mounted is pivotally supported. The above-mentioned cam 8 is attached to one end of the biting cylinder 1 in the axial direction so that the cam 8 has a common axis. The cam 8 is almost circular,
A convex portion 8a is formed on the outer peripheral surface.

On the other hand, a swing arm 10 having a cam follower 9 mounted on the tip is attached to one end of the swing shaft 4, and the cam follower 9 rotates while being in contact with the outer peripheral surface of the cam 8. A plurality of claws 18 are mounted on the swing shaft 4 via a support arm 17 and are seated on a receiving seat 19. The biting cylinder 1 is configured to rotate in the direction of the arrow a with the swing shaft 4 attached thereto via rotation driving means (not shown).

When the bite cylinder 1 is rotated in such a configuration, the swing shaft 4 revolves around the rotation axis of the bite cylinder 1, and the cam follower 9 attached to the swing arm 10 Rolls on the outer peripheral surface of the cam 8. At this time, the cam follower 9 raises the convex portion 8a, thereby rotating the swing shaft 4 in the counterclockwise direction to open the claw 18, and lowering the convex portion 8a to move the swing shaft 4 clockwise. It is configured to rotate in the direction and close the claws 18. Therefore, when the biting cylinder 1 rotates continuously, the swing shaft 4 swings between the solid line and the one-dot chain line shown in the rolling bearing 16 in FIG.

[0006]

As described above, as a conventional bearing which supports the swinging shaft 4 of the biting cylinder 1, a rolling bearing such as a general ball bearing or needle bearing which rotates in an arbitrary direction is used. 16 are provided. The rolling bearing 16 allows the ball of the ball bearing and the roller of the needle bearing to freely rotate along with the rotation of the swing shaft 4, and in a biting device or the like, alternately within a small angle. Forward rotation and reversal are repeated. Therefore, in the biting device or the like, the engagement position between the inner ring or the outer ring of the rolling bearing 16 and the roller 13 is limited to a limited portion, and a biased wear portion 13a is generated as shown in FIG. There was a problem to do.

That is, (1) In a rolling bearing, the same ball or roller always applies an axial load, and the same portion of the rolling surface and the same portion as the roller always repeat contact and non-contact. The rolling surface and a part of the roller are locally worn out. (2) When the swing angle is very small, the circulation of grease, oil, etc. held inside the bearing becomes further defective, which accelerates the occurrence of the trouble described in the above item (1) and shortens the life of the rolling bearing. Therefore, as shown in FIG.
Since only 3a is extremely worn and the roundness of the roller 13 is reduced, there is a problem that the torsion (play) of the swing shaft 4 is increased, the impact force is increased, and the wear is further promoted. SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a bearing for an oscillating shaft in which rollers or balls of the bearing are not locally worn.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a rolling bearing which supports a rocking shaft which is rotatable around a shaft and repeats normal rotation and reversal within a predetermined angle. In this case, two types of one-way clutches whose rotation direction is restricted to one direction and whose rotation direction is different are arranged on the rolling bearing so as to have the same rotation center and fit in the radial direction. That is, the rolling bearing of the oscillating shaft of the present invention rotates as a oscillating shaft serving as a center of rotation of the oscillating arm, that is, a oscillating shaft that alternately rotates and reverses alternately within a predetermined angle. Two types of one-way clutches having different directions have the same rotation center and are diametrically engaged.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a rolling bearing of a swing shaft according to an embodiment of the present invention will be described with reference to the drawings. The same parts as those in the related art are denoted by the same reference numerals and described, and detailed description thereof will be omitted. The rolling bearing of the oscillating shaft according to the present invention differs only in the portion of the rolling bearing 16 of the housings 3a and 3b disposed on the conventional bite cylinder 1 shown in FIG. Therefore, the configuration of only the bearing portion will be described in detail.

As shown in FIG. 1, the housing 3a has
A rolling bearing 20 that supports the swing shaft 4 is provided. The rolling bearing 20 includes a large-diameter one-way clutch 11 and a small-diameter one-way clutch 12 having different rotation directions.
Are mounted on the inner periphery of the large-diameter one-way clutch 11 with the same rotational center and the small-diameter one-way clutch 12.
Are fitted. The large-diameter one-way clutch 11
In FIG. 2, the housing 3a is allowed to rotate only in the counterclockwise direction, and the small-diameter one-way clutch 12 is allowed to rotate clockwise. The swing shaft 4 is assembled in a state where a hole provided in an inner peripheral portion of the small-diameter one-way clutch 12 is inserted.

Therefore, when the cam follower 9 rides on the convex portion 8a of the cam 8 and the swing arm 10 rises (rotates clockwise), the roller 13 inside the one-way clutch
Only the large diameter one-way clutch 11 rotates counterclockwise. Conversely, when the swing arm 10 descends (rotates counterclockwise) from the projection 8a, only the small-diameter one-way clutch 12 rotates clockwise. The one-way clutch 1
The directions of rotation of 1 and 12 may be reversed from those shown in FIG. In addition, the rolling bearings 20 provided at both ends of the swinging shaft 4 are arranged such that the small-diameter one-way clutch 12 corresponds to the rotation direction between the small-diameter one-way clutches, and the large-diameter one-way clutch 11 corresponds to the large-diameter one-way clutch. It is desirable that the rotation directions of the clutches 11 correspond to each other. It is desirable to use a one-way clutch of the same size as the small-diameter one-way clutch 12, and it is desirable to use a one-way clutch of the same size as the large-diameter one-way clutch 11.

Next, the operation of the swing shaft bearing according to the embodiment of the present invention will be described. As shown in FIG. 2, when the swing shaft 4 is rotated clockwise, the outer one-way clutch 11 is locked, and only the inner one-way clutch 12 operates to rotate the swing shaft. Conversely, when the swing shaft 4 is rotated counterclockwise, the inner one-way clutch 12 is locked, and only the outer one-way clutch 11 operates. That is, as the swing shaft 4 rotates, the rollers 13 incorporated in the inner and outer one-way clutches 12 and 11 continuously revolve around the swing shaft 4 in opposite predetermined directions. For this reason, even in the case of a minute swing, the built-in roller 13 rotates in only one direction, so that the load can be equally distributed over the entire circumference and grease (oil) is reliably taken into the bearing. Thereby, the wear of the roller 13 can be reduced,
The life of the rolling bearing 20 can be extended.

Although the embodiment of the present invention has been described above, the present invention is, of course, not limited to this, and various modifications can be made based on the technical concept of the present invention. For example, in the above embodiment, the swing shaft 4
Although the rolling bearing 20 is used, the rolling bearing of the oscillating shaft of the present invention can be applied to a device that requires a similar function. FIG. 3 shows a reduction drum 14 provided in a folding machine of a rotary press.
Is shown. As shown in the drawing, the reduction drum 14 is provided with a notch groove 2 along its axial direction, and a claw device 21 is disposed therein. The claw device 21 is provided with a support arm 17 to which the claw 18 is fixed around the swing shaft 4, and the claw 18 is seated on the receiving seat 19 in a non-operating state. The claw 18 can be opened and closed in the direction of the arrow b by a mechanism similar to the cam mechanism described above. The rolling bearing of the present invention can also be used for the swing shaft 4 of such a pawl device 21, and the same effect can be obtained.

FIG. 4 shows a folding blade device 22 incorporated in the folding cylinder 15. As shown in FIG.
Are arranged in the notch grooves 2 formed along the axial direction of the folding cylinder 15. The folding blade device 22 is provided with a support arm 17 to which the folding blade 23 is fixed around the swing shaft 4,
The folding blade 23 swings in the direction of arrow c by a mechanism similar to the cam mechanism described above. The rolling bearing of the present invention can also be used for the swing shaft 4 of such a folding blade device 22.

[0015]

A rolling bearing in which two kinds of one-way clutches whose rotation direction is restricted to one direction and which have different rotation directions is fitted with the same rotation center and fitted in the radial direction is provided. Is used as a swing shaft that alternately rotates forward and reverse within the angle of, so that the roller (or ball) of the rolling bearing and the rolling surface do not wear unevenly, and grease spreads inside the bearing and swings The life of the rolling bearing of the shaft can be extended.

[Brief description of the drawings]

FIG. 1 is a side view of a biting cylinder provided with a rolling bearing of a swing shaft according to an embodiment of the present invention.

FIG. 2 is a side view of a one-way clutch provided in a housing of the bite cylinder of FIG. 1;

FIG. 3 is a side view of a claw device incorporated in a reduction cylinder of a folding machine of a rotary press, which is a modification of the present invention.

FIG. 4 is a side view of a folding blade device incorporated in a folding cylinder, which is another modification of the present invention.

FIG. 5 is a side view of a conventional biting cylinder having a rolling bearing of a swing shaft.

6 is a sectional view taken along line XX in FIG.

FIG. 7 is a side view of a bearing disposed on a housing of the bite cylinder of FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Biting cylinder (cylinder) 2 Notch groove 3 Housing 4 Oscillating shaft 5 Bearing 6 Housing 7 Frame 8 Cam 9 Cam follower 10 Oscillating arm 11 One-way clutch 12 One-way clutch 13 Roller (or ball) 14 Reduction cylinder 15 Folding cylinder 17 Support arm 18 Claw 19 Receiving seat 20 Rolling bearing of swing shaft 21 Claw device 22 Folding blade device 23 Folding blade

Claims (1)

[Claims] 1. A rolling bearing which is rotatable around an axis and supports a swinging shaft which repeats normal rotation and reversal within a predetermined angle, wherein the rolling bearing is restricted in one direction by the rolling bearing, A rolling bearing for an oscillating shaft, wherein two types of one-way clutches having different rotation directions are arranged so as to have the same rotation center and fit in the radial direction.