JPH0430678Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] (Field of industrial application) This invention provides a guide roller in which the roller is rotatably supported on a shaft, which has a simple structure and is easy to assemble. The present invention relates to a guide roller that can be aligned to improve concentricity of the roller with respect to a shaft and to maintain good contact with a mating roller with which the circumferential surface contacts.

(Prior Art) Conventional guide rollers used in audio equipment, video equipment, OA equipment, etc. are, for example, a pinch roller 41 shown in FIG. Shaft 4
A structure in which a bearing 44 is interposed between the roller 2 and the roller 43 is common.

(Problems to be Solved by the Invention) <Problems of the Prior Art> However, in the case of a guide roller such as the pinch roller 41, there are the following problems.

That is, first of all, since many of this type of guide rollers are very small, the bearing 44 must also be very small. Therefore, this type of small bearing is expensive, and there is a problem in that the cost of the guide roller is greatly increased.

Second, in the case of such a structure, the bearing 44 is usually press-fitted into the shaft 42, and then the roller 43 is fitted onto the outside of the bearing 44. There is. However, since the accuracy of this type of guide roller is required to be almost on the order of microns, there is a problem in that even a slight bend during press-fitting often results in a defective product.

On the other hand, thirdly, the axis of the capstan with which the circumferential surface of the pinch roller comes into contact is not necessarily parallel to the axis of the pinch roller. In reality, in most cases, they are slightly deviated and not parallel. Therefore, in order to make good contact with the capstan, the pinch roller itself is formed with a slight play so that the axis of the pinch roller is parallel to the axis of the capstan for alignment. There is a need. However, in the case of the pinch roller 41, since the bearing 44 is interposed, the play cannot be adjusted, and the only way to align is to use the play of the completed bearing 44.
There was a problem that if there were manufacturing irregularities, unevenness would occur in the alignment, which would have an adverse effect.

<Technical Issues> Therefore, in view of the above-mentioned problems, this invention has a simple structure, improves the accuracy of concentricity of the roller with respect to the shaft, and allows easy alignment. Moreover, it was devised to provide a guide roller that is easy to process, easy to assemble, and inexpensive.

[Structure of the invention] (Means for solving the problem) This invention consists of a shaft installed upright on a support member, a roller extrapolated from the shaft and rotatably disposed, and a structure between the shaft and the roller. It consists of a plurality of balls interposed in a row in the circumferential direction so as to roll in the circumferential direction, and between the shaft and the roller, the ball is press-fitted onto the shaft, or the ball is inserted into the roller. a cylindrical rolling restricting portion press-fitted into the shaft and restricting the side surface of the ball so that the ball can roll freely only in the circumferential direction of the shaft; and In order to regulate the angle between the roller and the center axis of the roller to be variable only within a small angle range of about 1°, the inner and outer diameter dimensions were set to create an appropriate minute gap between the roller and the shaft. The above-mentioned problem is solved by providing an integrated regulating body having both axis angle regulating parts.

(Function) The guide roller according to this invention includes a plurality of balls arranged in a line between the shaft and the roller so as to roll in the circumferential direction of the shaft, and a plurality of balls also arranged between the shaft and the roller. By having a rolling restriction portion of a regulating body that restricts the balls to roll freely only in the circumferential direction of the shaft, the center axis of the roller can be tilted at an appropriate angle with respect to the axis of the shaft. Hold it like this.

At that time, the axis angle regulating part of the regulating body regulates the angle between the axis of the shaft and the central axis of the roller so that it can be changed only within a minute angle range of about 1°. By setting the inner and outer diameter dimensions so as to provide an appropriate minute gap between the axis angle regulating body and the shaft, the angle change between the axis of the shaft and the center axis of the roller can be controlled by that minute angle. Since it has a complete degree of freedom between the ranges, it self-aligns itself to properly follow the capstan, which abuts against the outer circumferential surface of the roller, and acts as a bearing that can be aligned as a whole. It is.

(Embodiments) Hereinafter, embodiments of this invention will be described with reference to the drawings.

That is, the first embodiment is shown in FIG. 1, in which reference numeral 1 denotes a pinch roller as a guide roller, and a shaft 2 in the shape of a straight round bar that is erected on a support member (not shown); A roller 3 that is extrapolated onto the shaft 2 and is rotatably arranged;
It is formed from a shaft 2 and a ball 5 interposed between a roller 3.

The roller 3 has a cylindrical shape made of a material with a large coefficient of friction, such as rubber, and is formed to fit into the inner cylinder 6.

The ball 5 is located between the shaft 2 and the roller 3,
Actually, there is a shaft 2 between the shaft 2 and the inner cylinder 6.
The balls 5 are arranged in a row with almost no gaps so that they can roll in the circumferential direction of the shaft 2, and between the shaft 2 and the roller 3, the balls 5 are regulated so that they can roll freely only in the circumferential direction of the shaft 2. A rolling regulating surface 7 as a rolling regulating section, and an axis angle regulating section that regulates the angle between the shaft center of the shaft 2 and the central axis of the roller 3 so that it can be changed only within a minute angle range of about 1°. It is formed with a regulating body 9 integrated to have an axis angle regulating surface 8 of.

These balls 5 and the regulating body 9 constitute a bearing device 4.

The regulating body 9 has two cylindrical bodies that are fitted into the inner cylinder 6, and the inner surface thereof is an axis angle regulating surface 8,
One side surface is used as a rolling restriction surface 7, and the angle between the axis of the shaft 2 and the center axis of the roller 3 is regulated so that it can be changed only within a minute angle range of about 1°. Set the inner diameter so that there is a slight gap. Also, the ball 5 is connected to the inner cylinder 6.
ball 5 of the regulating body 9.
The ball 5 is inserted into the inner cylinder 6 knowing the directions on both sides of the shaft 2, and a slight gap is provided between the ball 5 and the rolling regulating surface 7, so that the ball 5 is restricted to be able to roll freely only in the circumferential direction of the shaft 2. to form.

Moreover, although the axis angle regulating surface 8 of the regulating body 9 is the inner surface of the regulating body 9, a slight gap is formed between the shaft 2 and this axis angle regulating surface 8, and the gap is , so that the angle between the axis of the shaft 2 and the central axis of the roller 3 is regulated so as to be variable only within the minute angle range.

That is, the roller 3 is rotatably held with respect to the shaft 2 by the ball 5.
With only five groups of balls in a row, the angle of the central axis of the roller 3 with respect to the axis of the shaft 2 can be changed greatly. Therefore, the regulating body 9 is arranged so that the change is only within a small range as appropriate, and the axis angle regulating surface 8 comes into contact with the outer peripheral surface of the shaft 2, thereby regulating the angular variation between the axis and the central axis. It is something. Appropriately, the amount of change in angle is around 1°. Therefore, by appropriately setting the gap between the axis angle regulating surface 8 and the outer circumferential surface of the shaft 2 in a neutral state so that the amount of angle change is around 1°, this angle can be adjusted as follows.
Desirable for use as a pinch roller. Depending on the mode of use, this angle may be changed by setting the gap between the axis angle regulating surface 8 and the shaft 2. And the setting of this gap is, for example, 1°
In this case, if L is the distance from the point of contact between the shaft 2 and the ball 5 to the point of contact between the axis angle regulating surface 8 and the shaft 2, it can be determined by the formula 1/2L tan1° in the neutral state. .

In this state, as shown in FIG.
When a force is applied to the roller 3 in a direction that changes the angle between the axis of the shaft 2 and the center axis of the roller 3 while the roller 3 is fixed, the point of contact between the shaft 2 and the ball 5, that is, the The roller 3 is tilted to either side starting from the central axis. The maximum value of the inclination angle d is set to around 1°, and that angle is desirable.

Also, in this way, the axis angle regulating surface 8
Since the angle is regulated by contacting the outer circumferential surface, the frictional resistance between the axis angle regulating surface 8 and the outer circumferential surface of the shaft 2 should be as small as possible. For this reason, the regulating body 9 is formed of a material with low frictional resistance, such as fluorine resin, or by appropriately coating the surface with a material with low frictional resistance.

From the outside of the regulating body 9 thus arranged, the presser body 10 is fitted and fixed onto the shaft 2 with a substantially annular spacer 10a interposed therebetween. and,
The movement of the ball 5 and the regulating body 9 in the direction of the shaft 2 axes is regulated.

This not only reduces the frictional resistance between the regulating body 9 and the outer circumferential surface of the shaft 2, but also reduces the frictional resistance between the regulating body 9 and the spacer 10a and the spacer 10a.
It is also necessary to reduce the frictional resistance between the presser body 10 and the presser body 10. Therefore, it is preferable that the material of the spacer 10a, the material of the presser body 10, or the coating on the surface be made of a material with low frictional resistance.

The pinch roller 1 formed in this way is used in the state shown in FIG.
In this case, as mentioned above, the angle of the center axis of the roller 3 with respect to the axis of the shaft 2 can be changed by about 1 degree, so in other words, it has a degree of freedom within that range. Therefore, as shown in FIG. 7A, if the axes of the capstan C and the pinch roller 1 are completely parallel to each other, they will remain as they are.
Even if the axes of the capstan C and the pinch roller 1 are deviated in the downward expansion direction, as shown in B, or even in the case that they are deviated in the upward expansion direction, as shown in C, the deviation is at a slight angle. Therefore, the pinch roller 1 is aligned by following the capstan C, and the central axis of the pinch roller 1 is always parallel to the axis of the capstan C. Therefore, the entire surface of the tape T passing between the capstan C and the pinch roller 1 is uniformly pinched, so that the tape T can be controlled in a very good condition.

Moreover, like the conventional pinch roller 41,
The pinch roller 1 itself has a self-aligning bearing structure, rather than the structure in which the bearing 44 is separately formed and mounted, so the structure is simple and compact, and the shaft 2 In addition to improving the concentric precision of the roller 3, it is easy to process and assemble, and can be provided at a low cost. When actually comparing manufacturing costs, it can be manufactured at about half the cost of the conventional pinch roller 41.

On the other hand, the pinch roller 11 of the second embodiment shown in FIG. 3 has a regulating body 19 fitted onto the shaft 2 with the axis angle regulating surface 8 as the outer peripheral surface instead of the regulating body 9 of the first embodiment. It is something. In this case, the gap between the inner cylinder 6 and the axis angle regulating surface 18 is the same as that between the axis angle regulating surface 8 and the shaft 2 in the first embodiment.
It is set in the same way as the gap between. The rest of the structure is the same as that of the first embodiment, and the same effects can be achieved.

In the case of the pinch roller 21 of the third embodiment shown in FIGS. 4 and 5, the shaft 2 is arranged so that the balls 5 of the first embodiment are arranged at appropriate intervals.
A structure in which a ball spacing retaining ring 23 is arranged between the ball spacing retaining ring 23 and the roller 3, and in place of the regulating body 9, a regulating body 29 is disposed with a ring holding portion 22 that appropriately holds the ball spacing retaining ring 23 on the inner peripheral surface. belongs to. In this case, the number of balls 5 is smaller than in the first and second embodiments, and since the balls 5 do not contact each other, the frictional resistance at the contact portion during rolling can be reduced. , the rotation of the roller 3 relative to the shaft 2 can be performed more smoothly. Other structures are similar to those of the first embodiment, and other effects are also similar.

The fourth embodiment shown in FIG. 6 uses a presser body 40 formed by drawing a plate material by press processing in place of the presser body 10 of the second embodiment. This presser body 10 is molded at a lower cost than the example presser body 10, thereby reducing the overall cost.Other structures are the same as those of the first example, and the same effects are achieved.

Each of the embodiments shown above is just one example, and any combination may be used.

That is, it goes without saying that the present invention is not limited to the embodiments described above.

[Effects of the Invention] The invention constructed as described above comprises a shaft 2 erected on a support member, rollers 3 fitted onto the shaft 2 so as to be rotatable, and a plurality of balls 5 arranged in a row in the circumferential direction between the shaft 2 and the rollers 3 so as to roll in the circumferential direction. Between the shaft 2 and the rollers 3, there are provided a rolling restriction portion which is cylindrical and press-fitted onto the shaft 2 or press-fitted into the rollers 3, and restricts the side surface of the ball 5 so as to make the ball 5 free to roll only in the circumferential direction of the shaft 2, and an axis angle restriction portion 8 whose inner and outer diameter dimensions are set to provide a minute gap between the rollers 3 or the shaft 2 so as to restrict the angle between the axis of the shaft 2 and the central axis of the rollers 3 so as to be changeable only within a minute angle range of about 1°.
By providing the regulator 9 integrally having both of these features, the following effects are achieved.

That is, a plurality of balls 5 are arranged between the shaft 2 and the roller 3 to roll in the circumferential direction of the shaft 2, and the balls 5 are regulated so that they can roll freely only in the circumferential direction of the shaft 2. The rolling regulating portion of the regulating body 9 causes the roller 3 to move against the shaft 2.
It is possible to hold the roller 3 rotatably and tilt it at a fairly large angle with respect to the axis of the shaft 2 if the center axis of the roller 3 is only the rolling regulating portion.

At that time, the axis angle regulating part 8 of the regulating body 9 regulates the angle between the axis of the shaft 2 and the central axis of the roller 3 so that it can only be changed within a minute angle range of about 1 degree. Self-alignment is performed to properly follow the capstan that contacts the outer peripheral surface of the roller 3.

This is because the angle between the axis of the shaft 2 and the central axis of the roller 3 has complete freedom of change within the above range, so that even if the axis of what comes into contact with the peripheral surface of the roller 3, for example the capstan, is slightly misaligned, the roller 3 will follow it, and the entire system functions as a self-aligning bearing.

Moreover, like the conventional pinch roller 41,
Since the bearing 44 is not separately formed and mounted, but the pinch roller 1 itself has a self-aligning bearing structure, the structure is simple and compact.

With the above structure, the regulating body 9 plays the role of both regulating the rolling of the balls 5 and regulating the axis angle, and thus operates as a bearing, so the bearing 44 can be mounted more easily than the conventional pinch roller 41. There is no need to do so, and the concentric precision of the roller 3 with respect to the shaft 2 is improved, and it is easy to process and assemble, and above all, it can be provided at a low cost. As mentioned above, when comparing the actual manufacturing costs, it can be manufactured at about half the cost of the conventional pinch roller 41.

As described above, this invention has a simple structure, can improve the accuracy of concentricity of the roller with respect to the shaft, can easily perform alignment, and is easy to process and assemble. It has practical effects such as being able to provide the product at a low cost.

[Brief explanation of drawings]

Figures 1 to 8 show embodiments of this invention. Figure 1 is a sectional view of the first embodiment, Figure 2 is a sectional view showing the tilted state of the first embodiment, and Figure 3 is a sectional view of the first embodiment. 4 is a sectional view of the third embodiment, FIG. 5 is a perspective view of the main part, and FIG. 6 is a sectional view of the fourth embodiment.
FIG. 7 is a front view of the embodiment, FIG. 8 is a perspective view, and FIG. 9 is a sectional view of the conventional example. 1...pinch roller, 2...shaft, 3...
...Roller, 4...Bearing device, 5...Ball, 6
... Inner cylinder, 7 ... Rolling control surface, 8 ... Axis angle control surface, 9 ... Regulator, 10a ... Spacer, 1
0... Presser body, 11... Pinch roller, 18...
...Axis angle regulating surface, 19...Regulating body, 21...Pinch roller, 22...Ring holding part, 23...Ball spacing retaining ring, 29...Regulating body, 31...Pinch roller, 40...Pressing body , 41...Pinch roller, 42...Shaft, 43...Roller, 4
4...Bearing, C...Capstan, T...
Tape, d...Inclination angle.

Claims (1)

[Scope of utility model registration request] A shaft installed upright on a support member, a roller placed on the shaft so as to be freely rotatable, and a roller arranged in a row in the circumferential direction between the shaft and the roller so as to roll in the circumferential direction. between the shaft and the roller,
It has a cylindrical shape that is press-fitted onto the shaft or press-fitted into the roller, and the side surface of the ball is curved so that the ball can roll freely only in the circumferential direction of the shaft. A rolling regulation section that regulates
In addition, in order to regulate the angle between the axis of the shaft and the center axis of the roller so that it can be changed only within a minute angle range of about 1°, a minute gap is provided between the roller and the shaft as appropriate. A guide roller characterized by having an integrated regulating body having an axis angle regulating part with inner and outer diameter dimensions set.