JPH07130109A - Reciprocating body support mechanism - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a support mechanism for a reciprocating moving body that realizes high performance of the device and cost reduction by reducing the number of parts. [Structure] Two pins 2b are attached to one mounting portion 2a of the mounting portions 2a provided on both sides of the reciprocating body 2, and the other mounting portion 2 is mounted.
One pin 2b is erected on a, and the inner ring of the radial ball bearing 3 is fitted to the three pins 2b on the reciprocating body 2 to fix the radial ball bearing 3. Further, two guide members 1 and two guide grooves 1a are installed on both sides of the reciprocating body 2 so as to face each other and parallel to each other, and the two tapered surfaces 1b forming the guide grooves 1a are brought into contact with the tapered surfaces of the outer ring. Thus, the reciprocating body 2 supports the guide member 1. Further, an urging mechanism for urging the guide member 1 to bring the guide member 1 into contact with the radial ball bearing 3 is provided, and the reciprocating body 2 is supported by the guide member 1 by the urging of the urging mechanism. maintain.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a support mechanism of a reciprocating movable body applied to a moving mechanism of an optical head such as an optical disk device.

[0002]

2. Description of the Related Art Conventionally, as a technique of this kind, Japanese Patent Laid-Open No.
There are technologies described in Japanese Patent No. 260962 and Japanese Utility Model Laid-Open No. 3-14777.

In Japanese Patent Laid-Open No. 3-260962, two sets of guide rollers having two bearings are brought into contact with one of the two parallel guide rails, and one set of guide rollers is projected on the other. A technique is described in which a reciprocating movable body is supported by pressing and urging the template spring.

In Japanese Utility Model Laid-Open No. 3-14777, one carrier guide bearing having a U-shaped groove on the outer ring is brought into contact with one of two parallel guide rails, and a preload spring and a shaft urging member are used. A technique is described in which a reciprocating body is supported by pressing and biasing the other guide rail by a preload applying member having an inclined surface and a positioning edge portion.

[0005]

In the reciprocating body support mechanism disclosed in Japanese Patent Laid-Open No. 3-260962, a total of six ball bearings are arranged in the reciprocating body. by the way,
The ball bearing is a precision component composed of an inner ring, an outer ring, balls, etc., and is relatively expensive. The use of six ball bearings increases the cost of parts and is a major obstacle to cost reduction.

Further, in the optical disk drive device, high accuracy is required for the position and inclination of the reciprocating body, and the position and inclination of the reciprocating body are mainly the position and inclination of the ball bearing and the guide rail. Determined by position and inclination. However, in the support mechanism of the reciprocating body described in Japanese Patent Laid-Open No. 3-260962, since the ball bearing is disposed on the reciprocating body through the leaf spring, the accuracy of the position and inclination of the ball bearing is ensured. It is very difficult to do. Therefore, it is necessary to inspect and adjust the position and inclination of the reciprocating body in the manufacturing stage of the product, which increases the manufacturing cost, which is a major obstacle to cost reduction.

In the support mechanism disclosed in Japanese Utility Model Laid-Open No. 3-14777, a total of three carrier guide bearings are arranged on the reciprocating body. By the way, the carrier guide bearing has a U-shaped or V-shaped groove formed in the outer ring of the ball bearing, and the accuracy of this groove directly affects the accuracy of the position and inclination of the reciprocating body. Therefore, very high accuracy is required, machining is difficult, and the cost is higher than that of the ball bearing. Therefore, JP-A-3-260962
Although the number of bearings is half that of the one described in the publication, the actual situation is that the costs are almost the same, which is a major obstacle to cost reduction.

Further, in the supporting mechanism of Japanese Utility Model Laid-Open No. 3-14777, both ends of the guide rail are urged by pressing a preload applying member having a shaft pressing inclined surface and a positioning edge portion with a preload spring. . Due to the movement of the reciprocating body, the position where the carrier guide bearing abuts the biased guide rail becomes different, and therefore the biasing force changes at both ends of the guide rail. In other words, the guide rail tilts due to the movement of the reciprocating body,
There is a problem that the support of the reciprocating body tends to be unstable. Further, since the guide rail urging mechanism is complicated, the assembling workability is poor, and the number of parts is large, both the manufacturing cost and the parts cost increase, which is a major obstacle to cost reduction.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a support mechanism for a reciprocating movable body which solves the above problems and realizes improvement in workability of assembly and cost reduction by reducing the number of parts.

[0010]

In order to achieve the above object, the present invention is characterized by adopting the following means.

(1) A support mechanism for a reciprocating body which supports the reciprocating body and is capable of moving the reciprocating body along a guide member arranged parallel to the moving direction of the reciprocating body. The inner ring of the plurality of radial ball bearings is fixedly arranged on the reciprocating body, and the outer ring is brought into contact with the regulating surface of the guide member to support the reciprocating body.

(2) In the structure of (1), one end portion of the outer ring of the radial ball bearing in the direction of the rotation center axis and the cylindrical surface portion are in contact with the guide member.

(3). In the configuration of (1) or (2), the radial center of the radial ball bearing is provided perpendicularly to the plane of movement of the reciprocating body, and the radial ball bearing that contacts one guide member and the other The radial ball bearings that abut the guide members are arranged at different positions in the rotation axis direction.

(4). In the configuration of (1) or (2), the center axis of rotation of the radial ball bearing is provided perpendicular to the plane of movement of the reciprocating body, and between the reciprocating body and the apparatus fixing portion. It is characterized in that a permanent magnet and a magnetic body are installed in the reciprocating body and the apparatus fixing portion so that a magnetic attraction force works in the direction of the central axis of rotation.

(5). In the construction of (1), (2), (3) or (4), the guide member is composed of two cylindrical shafts supported so that their central axes are parallel to each other. It is characterized by being configured.

(6) In the construction of (5), one cylindrical shaft is fixedly arranged, and the other cylindrical shaft is rotatably arranged around the central axis, and the one cylindrical shaft is arranged to be a radial ball. It is characterized in that urging means for urging the bearing in the direction of abutting the outer ring of the bearing is provided.

(7). In the structure of (6), the biasing means is a spring member.

(8). In the construction of (7), the spring means is a torsion spring, which is wound around one cylindrical shaft of the other guide member, and one end of the other cylindrical shaft. And the other end is engaged with the device fixing part.

[0019]

According to the above construction, the following operation will occur.

According to the construction of (1), the reciprocating body can be movably supported by using at least three general-purpose radial ball bearings.

According to the structure of (2), the position and inclination of the reciprocating body are stabilized by bringing the outer ring cylindrical surface of the radial ball bearing into contact with the guide member.

According to the configuration of (3), when the outer ring of the radial ball bearing receives a pressing force from the guide member, this pressing force becomes a rotation moment around the center of gravity of the reciprocating body, and the radial ball bearing has a rotation center axis. Directional force is applied. Due to the component force in the direction of the rotation center axis, preload is applied to the inner ring and the outer ring of the radial ball bearing, and the vibration and shock resistance performance in the direction of the rotation center axis is improved.

According to the structure of (4), since the magnetic attraction force acts between the reciprocating body and the device fixing portion, and the radial ball bearing is preloaded, the seismic resistance in the rotation center axis direction is increased. Dynamic and shock resistant performance is improved.

According to the configuration of (5), since the cylindrical shaft can easily secure the machining accuracy and the machining cost is low, the reciprocating body can be highly accurately supported at a low cost.

According to the structure of (6), the reciprocating body is always stable regardless of the moving position because the spring means for pressing the other cylindrical shaft in the direction of contacting the outer ring of the radial ball bearing is provided. Is supported in a stable state.

According to the configuration (7), in the guide member constituted by the two cylindrical shafts, one cylindrical shaft is rotatably supported and the other cylindrical shaft is pressed against the radial ball bearing. The function to perform can be configured with simple parts.

According to the structure (8), in the guide member constituted by the two cylindrical shafts, one cylindrical shaft is rotatably supported and the other cylindrical shaft is pressed against the radial ball bearing. The function to be performed can be constituted by simple parts, and a mounting member such as a screw is not required for mounting the guide member.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a constitutional view showing an essential part of a first embodiment of the present invention. FIG. 1 (a) is a plan view and FIG. 1 (b) is a front view.
FIG. 2 is a sectional view taken along line XX of FIG. 1 and 2
In the figure, reference numeral 1 denotes a guide member, and a V-shaped guide groove 1a is formed in the guide member 1 in the longitudinal direction.
Reference numeral 2 indicates a reciprocating body, and 3 indicates a radial ball bearing. The reciprocating body 2 is provided with mounting portions 2a for the radial ball bearings 3 on both sides, and one mounting portion 2a has two pins 2b which are the central axes of the radial ball bearings 3 on both sides of the mounting portion 2a. One pin 2b is erected on the other mounting portion 2a at the center of the one mounting portion 2a. The pin 2b is erected perpendicularly to the moving surface of the reciprocating body 2.

As shown in FIG. 2, the radial ball bearing 3 is composed of an inner ring 3a, an outer ring 3b, and balls 3c interposed between the inner ring 3a and the outer ring 3b. Further, the upper and lower corners of the outer periphery, which is the end of the outer ring 3b in the direction of the central axis of rotation, are chamfered to form two tapered surfaces 3d. Then, as shown in FIGS. 1 and 2, the radial ball bearings 3 are fixed by fitting the inner ring 3a to the pins 2b on the three reciprocating movable bodies 2.

The two guide members 1 are installed in parallel with the guide grooves 1a facing each other. Then, the reciprocating body 2 is supported by the two guide members 1 by bringing the tapered surface 3d of the outer ring 3b into contact with the two tapered surfaces 1b which are the regulation surfaces forming the guide groove 1a. In addition,
Although not shown, the other guide member 1 with which one radial ball bearing 3 is in contact is replaced by the one guide member 1.
The urging mechanism that urges to the side is provided.
The radial ball bearing 3 is kept in contact with the guide member 1 by the urging force (not shown).

By adopting such a structure, the reciprocating movable body 2 can be supported by using only three general-purpose radial ball bearings 3, so that the cost of the apparatus can be reduced.

FIG. 3 is a constitutional view showing a main part of a second embodiment of the present invention. FIG. 3 (a) is a plan view and FIG. 3 (b) is a front view. FIG. 4 is a sectional view taken along line XX of FIG. Figure 3,
In FIG. 4, reference numeral 4 denotes a guide member, and a V-shaped guide groove 4a is formed in the guide member 4 in the longitudinal direction. Further, the guide member 4 is continuous with the guide groove 4a and is attached to the rotation center axis of the radial ball bearing 3. Parallel plane portions 4d are formed. The guide groove 4a is composed of a tapered surface 4c continuous with the flat surface portion 4d and a tapered surface 4b continuous with the flat surface portion 4e, and the tapered surface 4b is formed slightly wider than the tapered surface 4c. Therefore, the flat surface portion 4d is located at a position one step lower than the flat surface portion 4e. In addition, from this point onward, FIG.
The same members as those in the first embodiment shown in FIG. 9 are designated by the same reference numerals, and detailed description thereof is omitted.

The two guide members 4 face each other so that the guide grooves 4a are in a rotationally symmetrical position, and the two guide members 4 are installed in parallel. Then, the tapered surface 4b of the one guide groove 4a is brought into contact with the tapered surface 3d of the upper portion of the outer ring 3b of the two radial ball bearings 3 provided in the one mounting portion 2a, and at the same time, the flat surface portion 4d is cylindrical. The outer peripheral surface 3e is brought into contact. Further, the lower tapered surface 3d of the outer ring 3b of one radial ball bearing 3 provided on the other mounting portion 2a is brought into contact with the tapered surface 4b of the other guide groove 4a, and at the same time, the flat surface portion 4d has a cylindrical shape. The reciprocating movable body 2 is supported by the two guide members 4 by bringing the outer peripheral surface 3e into contact with each other. The second embodiment is also the first
Similar to the embodiment, the other guide member 4 is replaced by the one guide member 4
The urging mechanism that urges to the side is provided.
The radial ball bearing 3 is kept in contact with the guide member 1 by the urging force (not shown).

By adopting such a configuration, normally,
In the outer ring 3b of the general-purpose radial ball bearing 3, since the cylindrical outer peripheral surface 3e is formed with higher accuracy than the tapered surface 3d, the second embodiment reciprocates as compared with the first embodiment. The body 2 can be supported with high precision.

FIG. 5 is a front view showing the construction of the third embodiment of the present invention, and FIG. 6 is a sectional view showing the construction of the radial ball bearing in FIG. 5 and its vicinity. In the third embodiment, the heights of the mounting portions 2a on both sides of the reciprocating moving body 2 in the above-described first embodiment are different.
That is, as shown in FIG. 5, a step L is provided between the two radial ball bearings 3 installed on the one mounting portion 2a and one radial ball bearing 3 installed on the other mounting portion 2a. It was set up.

The third embodiment is also provided with an urging mechanism for urging the other guide member 4 toward the one guide member 4 as in the first embodiment. Therefore, by the urging force of this urging mechanism (not shown), a pressing force is applied to the two radial ball bearings 3 on one side in the direction of the central axis of the reciprocating body 2, that is, the direction A in the figure, and the other radial ball bearing 3 is pressed. The ball bearing 3 also receives a pressing force in the central axis direction of the reciprocating moving body 2, that is, in the B direction in the figure. The positions of the radial ball bearings 3 are set so that the pressing force in the A direction is applied above the center of gravity G of the reciprocating body 2 and the pressing force in the B direction is applied below the center of gravity G of the reciprocating body 2. Has been done.
Therefore, the pressing force becomes a rotation moment around the center of gravity G of the reciprocating body 2.

When a rotational moment is applied to the reciprocating body 2, as shown in FIG. 6, the inner ring 3a rotates in the direction of rotation about the center of gravity G, that is, substantially in the direction of the rotation center axis of the radial ball bearing 3 (direction C in the figure). To try to move to
A component force is applied between the inner ring 3a and the outer ring 3b in the direction of the rotation center axis.

By adopting such a configuration, the inner ring 3a and the outer ring 3b of the radial ball bearing 3 are preloaded in the direction of the rotation center axis, so that the earthquake resistance and impact resistance in the direction of the rotation center axis are improved. improves. As a result, the reciprocating body 2 is supported with higher accuracy. In addition,
This structure can also be applied to the second embodiment described above.

FIG. 7 is a front view showing the structure of the fourth embodiment of the present invention, 5 is a base plate for fixing the guide member 1 and the like,
Reference numeral 6 denotes a permanent magnet attached to the lower surface of the reciprocating body 2, and 7 denotes a magnetic body attached to the base plate 5 over the moving range of the reciprocating body 2. That is, the fourth embodiment is similar to the first embodiment shown in FIG. 1 except that the base plate 5, the permanent magnets 6,
The magnetic material 7 is added.

By adopting such a structure, the reciprocating moving body 2 is acted on by the magnetic attraction force in the direction D in the drawing within the moving range. Due to this magnetic attraction force, the inner ring 3a and the outer ring 3b of the radial ball bearing 3 are preloaded in the rotation center axis direction as shown in FIG. 6, so that the earthquake resistance and impact resistance performance in the rotation center axis direction are improved. To do. As a result, the reciprocating body 2 is supported with higher accuracy.

In the configuration shown in FIG. 7, the reciprocating movable body 2
Although the permanent magnet 6 is attached to the base plate 5 and the magnetic body 7 is attached to the base plate 5, the same effect can be obtained even if the magnetic body 7 is attached to the reciprocating body 2 and the permanent magnet 6 is attached to the base plate 5. In addition, a configuration is also conceivable in which a permanent magnet, a magnetic yoke, and the like of a linear motor that is generally used for driving the reciprocating body 2 are combined to obtain a magnetic attraction force. Note that this configuration can be applied to the second embodiment described above.

FIG. 8 is a block diagram of the fifth embodiment of the present invention, FIG. 8 (a) is a plan view, and FIG. 8 (b) is a sectional view taken along line YY of FIG. 8 (a). In FIG. 8, 8 is a guide member, 9 is a cylindrical shaft, and 10 is a support member. The guide member 8
In this example, the support members 10 are attached to both ends of the two columnar shafts 9, and the two columnar shafts 9 are arranged in parallel so that the central axes of the two columnar shafts 9 are parallel to each other and fixedly supported. Also,
The distance between the two cylindrical shafts 9 is set shorter than the height of the outer ring 3b.

Two sets of the guide members 8 are shown in FIG.
As shown in FIG. 8 (a), the reciprocating body 2 is installed in parallel with each other, and as shown in FIG. 8 (b), the upper and lower cylindrical shafts 9 are brought into contact with the tapered surfaces 3d of the outer ring 3b. It is supported by the book guide member 8. Although not shown, the fifth
As in the first embodiment, the embodiment is also provided with a biasing mechanism that biases the other guide member 8 with which one radial ball bearing 3 is abutting, toward the one guide member 8 side. The urged force (not shown) maintains the supported state of the reciprocating body 2.

With this structure, the guide member having the V-shaped guide groove 1a (see FIG. 1) described in the first embodiment has a relatively high processing cost for ensuring the accuracy of the groove. On the other hand, since the cylindrical shaft 9 can easily secure the processing accuracy and the processing cost is relatively low, the highly accurate support of the reciprocating movable body 2 can be realized at a low cost. Note that this configuration can be applied to the above-described second to fourth embodiments.

FIG. 9 is a front view showing the configuration of the sixth embodiment of the present invention, and 9a shows an axis provided on the central axis of the lower cylindrical shaft 9. In the sixth embodiment, the lower cylindrical shaft 9 in the structure of the fifth embodiment described above is made rotatable. That is, the shaft 9a is rotatably supported by the support member 10. Further, the upper cylindrical shaft 9 is pressed and biased by a biasing mechanism (not shown) in the direction of coming into contact with the radial ball bearing 3. In addition,
After this, the upper cylindrical shaft 9 is replaced by the upper shaft 9
A, the lower cylindrical shaft 9 will be referred to as a lower shaft 9B.

With this structure, since the lower shaft 9B is rotated by the pressing force received through the reciprocating body 2, the outer ring 3b of the radial ball bearing 3 is always in the upper shaft 9A and the lower shaft 9B.
With this, the moving direction of the reciprocating movable body 2 and the central axis of the lower shaft 9B can be kept in parallel with each other. Therefore, the reciprocating body 2 is always supported in a stable state regardless of the moving position.

FIG. 10 is a front view showing the structure of the seventh embodiment of the present invention, 11 shows a leaf spring which is a biasing means, and this leaf spring 11 has a spring portion 11a for pressing the upper shaft 9A. ,
It has a spring portion 11b for pressing the lower shaft 9B. Reference numeral 12 denotes a screw for fixing the leaf spring 11 to the base plate 5.

A positioning portion 5a for positioning the lower shaft 9B is provided on a part of the base plate 5, and the lower shaft 9B is pressed by the spring portion 11b in the direction of the positioning portion 5a.

With this structure, the lower shaft 9B
Can be rotatably supported, and the function of pressing the upper shaft 9A against the radial ball bearing 3 can be realized with a simple structure and at low cost. Therefore, the reciprocating moving body 2 is always supported in a stable state regardless of the moving position. It is desirable that the spring portions 11a and 11b of the leaf spring 11 be provided at both ends of the cylindrical shaft 9 in the moving direction of the reciprocating movable body 2. In this case, the spring portion 11a and the spring portion 11b that press the both ends of the upper and lower shafts 9A and 9B are integrated,
It is also possible to press with one leaf spring.

FIG. 11 is a front view showing the structure of the eighth embodiment of the present invention, and 13 shows a torsion spring which is a biasing mechanism. Further, holes 5b are formed in the lower portion of both ends of the lower shaft 9B in the base plate 5. The torsion spring 13 is wound around both ends of the lower shaft 9B,
One end is engaged with the hole 5b and the other end is in contact with the upper shaft 9A. Therefore, the other end of the torsion spring 13 presses the upper shaft 9A toward the radial ball bearing 3 side,
Further, the lower shaft 9B is biased toward the positioning portion 5a.

With this structure, the lower shaft 9B
Can be rotatably supported, and the function of pressing the upper shaft 9A against the radial ball bearing 3 can be realized with a simple configuration and at low cost. Therefore, the reciprocating moving body 2
Will always be supported in a stable state regardless of the movement position. Further, since the mounting member such as the screw 12 used in the eighth embodiment is not required, the device assembling property is improved and the manufacturing cost can be reduced.

[0052]

According to the present invention constructed as described above, the following effects can be obtained.

According to the structure of claim 1, the reciprocating movable body can be movably supported by using at least three general-purpose radial ball bearings, so that the cost can be reduced.

According to the second aspect of the present invention, since the outer ring cylindrical surface of the radial ball bearing is brought into contact with the guide member, the position and the inclination of the reciprocating body are stabilized, so that the accuracy of the apparatus can be improved.

According to the constitutions of claims 3 and 4, since the inner ring and the outer ring of the radial ball bearing are preloaded, the vibration resistance and impact resistance performance in the direction of the rotation center axis are improved, and the high performance of the device is achieved. Accuracy can be improved.

According to the fifth aspect of the present invention, since the cylindrical shaft is used as the guide member, the machining can be performed with high accuracy and the machining cost is low, so that the precision and cost of the device can be improved.

According to the structure of claim 6, since the reciprocating body can be always supported in a stable state regardless of the moving position of the reciprocating body, the precision of the apparatus can be improved.

According to the seventh aspect of the invention, since the function of pressing the other cylindrical shaft against the radial ball bearing can be constituted by simple parts, the precision and cost of the device can be improved.

According to the structure of claim 8, a mounting member such as a screw is not required for mounting the guide member, so that the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a main part of a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line XX of FIG.

FIG. 3 is a configuration diagram showing a main part of a second embodiment of the present invention.

FIG. 4 is a sectional view taken along line XX of FIG.

FIG. 5 is a front view showing the configuration of a third embodiment of the present invention.

6 is a cross-sectional view showing a state of the radial ball bearing in FIG.

FIG. 7 is a front view showing the configuration of the fourth exemplary embodiment of the present invention.

FIG. 8 is a configuration diagram of a fifth embodiment of the present invention.

FIG. 9 is a front view showing the configuration of a sixth embodiment of the present invention.

FIG. 10 is a front view showing the configuration of a seventh embodiment of the present invention.

FIG. 11 is a front view showing the configuration of an eighth embodiment of the present invention.

[Explanation of symbols]

1, 4, 8 ... Guide member, 1a, 4a ... Guide groove, 2
... Reciprocating body, 2a ... Mounting part, 2b ... Pin, 3 ... Radial ball bearing, 3a ... Inner ring, 3b ... Outer ring,
3c ... Ball, 4b, 4c ... Tapered surface, 4d, 4e ...
Flat part, 5 ... Base plate, 5a ... Positioning part, 5b ...
Hole, 6 ... Permanent magnet, 7 ... Magnetic material, 9 ... Cylindrical shaft, 9a ... Shaft, 10 ... Support member, 11 ... Leaf spring, 11
a, 11b ... Spring part, 12 ... Screw, 13 ... Torsion spring.

Claims (8)

[Claims] 1. A reciprocating body support mechanism for supporting a reciprocating body and allowing the reciprocating body to move along a guide member arranged parallel to a moving direction of the reciprocating body. A support mechanism for a reciprocating body, wherein an inner ring of the radial ball bearing is fixedly arranged on the reciprocating body, and an outer ring is brought into contact with a regulating surface of the guide member to support the reciprocating body. 2. A support mechanism for a reciprocating body according to claim 1, wherein an end portion of the outer ring of the radial ball bearing in the direction of the rotation center axis and a cylindrical surface portion are in contact with the guide member. 3. A radial ball bearing having a central axis of rotation of a radial ball bearing perpendicular to a plane of movement of a reciprocating body, and a radial ball bearing abutting on one guide member and a radial ball bearing abutting on the other guide member, respectively. The support mechanism for the reciprocating body according to claim 1 or 2, wherein the support mechanism is arranged at different positions in the rotational axis direction. 4. A center axis of rotation of the radial ball bearing is provided perpendicularly to the plane of movement of the reciprocating body, and a magnetic attraction force acts in the direction of the center axis of rotation between the reciprocating body and the apparatus fixing portion. 3. The support mechanism for a reciprocating body according to claim 1, wherein a permanent magnet and a magnetic body are installed on the reciprocating body and the apparatus fixing portion. 5. The reciprocating body according to claim 1, 2, 3 or 4, wherein the guide member is composed of two cylindrical shafts fixed so that their central axes are parallel to each other. Support mechanism. 6. One cylindrical shaft is fixedly arranged, the other cylindrical shaft is rotatably arranged around a central axis, and the one cylindrical shaft is pressed in a direction of abutting the outer ring of the radial ball bearing. 6. The reciprocating body support mechanism according to claim 5, further comprising a biasing means for biasing. 7. The support mechanism for a reciprocating body according to claim 6, wherein the urging means is a spring member. 8. A torsion spring is used as the spring means, and the torsion spring is wound around the other cylindrical shaft, and one end of the torsion spring is engaged with the one cylindrical shaft, and the other end is fixed to the device fixing portion. The support mechanism for the reciprocating body according to claim 7, wherein the support mechanism is engaged.