JPH0574067A - Guide mechanism - Google Patents

Abstract

PURPOSE:To provide a guide mechanism capable of making assembling easy and reducing the weight of a carriage while the working precision of each component is not demanded so much regarding the guide mechanism constituted of first and second guide bars arranged side by side on a fixing side and plural sliders arranged on a moving side and slided to the above-mentioned first and second guide bars. CONSTITUTION:Cam parts 70 and 71 having cylindrical surfaces are provided on both ends of the guide bar 53 of two guide bars 53 and 54 arranged side by side and the position of the guide bar 53 is finely adjusted by rotating the guide bar 53.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to first and second guide bars arranged side by side on a fixed side, and a plurality of sliders provided on the moving side and slidably contacting the first and second guide bars. A guide mechanism composed of

[0002]

2. Description of the Related Art Next, a conventional example will be described with reference to the drawings. 5 is a plan configuration diagram showing an example of a conventional information recording / reproducing apparatus having a guide mechanism, FIG. 6 is a front configuration diagram in FIG. 5, FIG. 7 is a configuration diagram of the carriage shown in FIG. 5, and FIG. 8 is I in FIG. 9 is a sectional view taken along the line II in FIG. 9 when the drive coil is removed, FIG. 10 is a sectional view taken along the line AA in FIG. 9, and FIG. 11 is a sectional view taken along the line BB in FIG. ..

The laser light entrance means 5 is a semiconductor laser 5
a, a collimator lens (not shown), a prism, a beam splitter, and an actuator 5c for holding the objective lens 5b for condensing the laser light on the magneto-optical disk and causing the spot of the laser light to follow the track of the magneto-optical disk. It is composed.

Reference numeral 6 denotes a reflected light detecting means for detecting the reflected light from the magneto-optical disk. The objective lens, the actuator, the beam splitter and the beam splitter, the condenser lens, and the detecting lens (not shown) in common with the laser light entering means 5 are provided. Photons, etc.
And a light detection element 6a and the like.

A carriage 7 is provided with a laser light incident means 5 and a reflected light detection means 6 for reading / writing the magneto-optical disk so that the actuator can follow the laser light and moving it to a track position. is there. The carriage 7 is guided by first and second guide rails 8 and 9.

Reference numeral 10 denotes a carriage moving means, which includes drive coils 10a provided on both side surfaces of the carriage 7 and a first coil.
And a magnetic circuit 10b provided along the second guide rails 8 and 9 to form a moving coil type linear motor.

Reference numeral 11 is a magnetic field generating means for applying a bias magnetic field to the magneto-optical disk. Next, FIGS.
The carriage 7 in FIG. 5 will be described with reference to FIG.
The carriage 7 includes an upper body 7a and a lower body 7 that engages with a lower portion of the upper body 7a on the guide rail 8 side.
b. Two pairs of bearings 12, 13, 14, 15 are rotatably attached to the upper body 7a so as to sandwich the guide rail 9 from above and below. (Not shown). Further, a guide rail 16 is rotatably attached to the upper body 7a so as to come into contact with the guide rail 8 obliquely from above.

Further, a bearing 17 is slidably attached to the lower body 7b so as to come into contact with the guide rail 8 from obliquely below. In order for the carriage 7 to move smoothly (in particular, there is no vertical play),
At least one of the lower bearings must always abut the guide rail. Therefore, in this conventional example, a mechanism for urging the lower body 7b provided with the lower bearing 17 to the upper body 7a is provided.

Next, the attachment of the upper body 7a and the lower body 7b of the carriage 7 will be described with reference to FIGS. The upper body 7a includes an upper body 7a.
Two stepped holes 7 that penetrate from the upper surface to the lower surface
c and 7d are provided. The lower body 7b also has holes 7e that oppose the stepped holes 7c and 7d of the upper body 7a.
7d (7d is not shown) is drilled.

A shaft 18 is inserted into one stepped hole 7c of the upper body 7a and one hole 7e of the lower body 7b. A first ring 19 that holds the lower body 7b by contacting the bottom of the lower body 7b is fixed to the lower end of the shaft 18, and can contact the step of the stepped hole 7c of the upper body 7a in the middle. The second ring 20 is attached so as to be movable in the axial direction of the shaft 18, and the third ring 21 is fixed to the upper end portion. Further, the second ring 20 and the third ring 20 of the shaft 18
Is wound around the shaft 18 with one end contacting the second ring 20 and the other end contacting the third ring 21, and the lower body 7b is attached in the upper body 7a direction. A biasing spring 22 is provided. A steel ball 23 is fixed near the lower body 7b of the upper body 7a. Further, a groove 7f into which the steel ball 23 is fitted is formed in the lower body 7b, and the lower body 7b
b is rotatable around a steel ball 23, and is urged to rotate in the arrow direction in FIG. 11 by the urging force of the spring 22 described above, and the bearing 17 is pressed against the guide rail 8 (preload state). ).

Similarly, the shaft 24 is inserted into the other stepped hole 7d of the upper body 7a and the other hole 7d of the lower body 7b, and the first to third rings 25- 27, a spring 28, and a steel ball 29 are arranged.

Next, the operation of the above configuration will be described. When the magneto-optical disk cartridge 3 is set in the cartridge holder 2, the cartridge holder 2 engages the magneto-optical disk cartridge 3 with the driving means 4. The drive means 4 rotationally drives the magneto-optical disk cartridge 3.

The carriage 7 has a carriage moving means 10
Thus, the target track is moved to the magneto-optical disk cartridge 3, and data reading / writing is performed on the magneto-optical disk cartridge 3.

[0014]

In recent years, in the guide mechanism, in order to reduce the weight of the carriage 7, to increase the access speed and to reduce the power consumption, the bearing 17 is used.
There is a demand to eliminate the mechanism that presses against the guide rail 8.

However, if only such a pressing mechanism is eliminated, there is a problem that extremely high precision is required for each component and that the number of assembling steps is also increased. The present invention has been made in view of the above problems, and an object thereof is to provide a guide mechanism that does not require high processing accuracy of each component, is easy to assemble, and can reduce the weight of a carriage. It is in.

[0016]

According to the present invention for solving the above-mentioned problems, first and second guide bars arranged side by side on a fixed side and first and second guide bars provided on a moving side are provided. In a guide mechanism composed of a plurality of sliders slidably contacting with each other, a cam cylindrical surface attached to one end of the first guide bar and parallel to the axis of the guide bar and abutting the fixed side surface is provided. A first cam portion having, and a second cam portion having the same shape as the first cam portion, arranged in the same direction as the first cam portion, and having a cam cylindrical surface in contact with the fixed side surface. A first elastic member whose one end is fixed to the fixed side and whose tip is pressed against the cam cylindrical surface of the first cam portion; one end is fixed to the fixed side; Two
And a second elastic member pressed against the cam cylindrical surface of the cam member.

[0017]

In the guide mechanism of the present invention, by rotating the first guide bar, the position of the cam cylindrical surface that abuts on the fixed side surfaces of the first cam portion and the second cam portion is changed. The position of the first guide bar with respect to the second guide bar changes, and the relative position between the first guide bar and the second guide bar changes.

[0018]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a perspective view of a configuration for explaining an embodiment of the present invention, FIG. 2 is an enlarged perspective view of an essential part in FIG. 1, and FIG. 3 is a cross-sectional dimensional relationship of the first and second cam parts in FIG. Figure,
FIG. 4 is a diagram for explaining the operation of this embodiment.

First, an embodiment of the present invention will be described with reference to FIGS. In FIG. 1, 51 and 52 are first and second support columns provided on a base (not shown) on the fixed side. The first and second support columns 51 and 52 are
Notches A and B having the same shape are formed respectively, and in these notches A and B, horizontal reference planes 51a and 52a and vertical reference planes 51b and 52b orthogonal to these are formed respectively.

Reference numeral 53 designates notches A and B in the supporting columns 51 and 52.
A first guide bar, both ends of which are mounted on the first guide bar, is a second guide bar attached to the base side and arranged in parallel with the first guide bar 53.

Reference numeral 55 is a carriage on the moving side. Bearings 56 and 57 as two sets of sliders, which contact the first guide bar 53 so as to sandwich the first guide bar 53 from diagonally below and diagonally above, are provided on one side of the carriage 55.
8 and 59 are rotatably mounted (the lower bearings 57 and 59 are not shown).

Similarly, on the other side of the carriage 55, bearings 6 as two sets of guides that abut the second guide bar 54 so as to sandwich the second guide bar 54 from obliquely below and obliquely above.
0, 61 and 62, 63 are rotatably mounted (the lower bearings 61 and 63 are not shown).

A first cam portion 70 that abuts the notch A of the first support column 51 is provided at one end portion of the guide bar 53, and the same shape as the first cam portion 70 is provided at the other end portion. The 2nd cam part 71 which contacts the notch B of the 2nd support pillar 52 is each attached.

Next, a method of attaching the first cam portion 70 to the support column 51 will be described with reference to FIG. Incidentally, since the attachment of the second cam portion 71 to the support column 52 is also the same,
The detailed description is omitted.

The horizontal reference plane 51 of the notch A of the support column 51
The base end of the first leaf spring 72 is attached to a by using a screw 73. The tip of the leaf spring 72 has a first
The cam cylindrical surface of the cam portion 70 is pressed against. The pressing of the leaf spring 72 causes the cylindrical surface of the first cam portion 70 to move to the first
Of the supporting column 51 is in contact with the horizontal reference plane 51a and the vertical reference plane 51b, respectively.

Similarly, on the support column 52 side, the second leaf spring 7 is also provided.
Due to the urging force of 3, the cam cylindrical surface of the second cam 71 causes the horizontal reference surface 52a and the vertical reference surface 52b of the second support column 52 to be moved.
Abutting against each other.

A small hole 75 is formed on the cylindrical surface of the first cam portion 70, and a rotary jig 76 is inserted into the small hole 75. First and second cam portions 7
The cross-sectional shape of 0,71 has a maximum diameter of 2 as shown in FIG.
R1, the minimum diameter is 2R0, and when the angle is shown in the counterclockwise direction with the xy coordinate, the range of 90 ° to 270 ° is a semicircle with the minimum diameter 2R0 (constant), and the maximum diameter 2R1 at 0 ° is an elliptical shape. is there.

In this structure, when assembled, the first guide bar 53 is assembled so as to abut on the vertical reference plane at the position R = (R1 + R0) / 2, as shown in FIG. ..

Then, each bearing 5 of the carriage 55
When 6 to 63 do not come into good contact with the first and second guide bars 53 and 54, the rotary jig 76 is inserted into the small hole 75 of the first cam portion 70, and the first guide bar 53 is removed. And rotate it in the direction of the arrow. By moving the first guide bar 53 with respect to the reference surface 51a, the position of the first guide bar 53 is finely adjusted.

According to the guide mechanism having the above structure, the machining accuracy of each component is not so required. Also, the assembling is easy, and the weight of the carriage can be reduced. The present invention is not limited to the above embodiment. For example,
Instead of the bearing used as the slider, it is possible to use a shoe or the like having a small frictional resistance. Further, although the first cam portion 70 and the second cam portion 72 are described as being attached to both ends of the first guide bar 53,
The same member may be processed.

[0031]

As described above, according to the present invention,
It is possible to realize a guide mechanism that does not require high processing accuracy of each component, is easy to assemble, and can reduce the weight of the carriage.

[Brief description of drawings]

FIG. 1 is a configuration perspective view illustrating an embodiment of the present invention.

FIG. 2 is an enlarged perspective view of a main part in FIG.

FIG. 3 is a diagram illustrating a dimensional relationship of cross sections of first and second cam portions in FIG.

FIG. 4 is a diagram illustrating the operation of the present embodiment.

FIG. 5 is a plan view showing an example of a conventional information recording / reproducing apparatus having a guide roller supporting mechanism.

FIG. 6 is a front configuration diagram in FIG.

7 is a configuration diagram of the carriage shown in FIG.

FIG. 8 is a view on arrow I in FIG.

FIG. 9 is a view in the direction of the arrow II when the drive coil is removed in FIG. 7.

10 is a cross-sectional view taken along the line AA in FIG.

11 is a sectional view taken along line BB in FIG.

[Explanation of symbols]

 53 1st guide bar 54 2nd guide bar 56-63 guide 70 1st cam part 71 2nd cam part 72 1st elastic member 73 2nd elastic member

Claims (1)

[Claims] 1. A first and a second guide bar (53, 54) arranged in parallel on a fixed side, and the first and second guide bars (53, 54) provided on the moving side.
And a guide mechanism composed of a plurality of sliders (56 to 63) slidingly contacting the second guide bar (53, 54), the guide mechanism being attached to one end of the first guide bar (53), A first cam portion (70) having a cam cylindrical surface parallel to the axis of the first guide bar (53) and in contact with the surface on the fixed side, and having the same shape as the first cam portion (70); A second cam portion (71) arranged in the same direction as the first cam portion (70) and having a cam cylindrical surface in contact with the fixed side surface, and one end fixed to the fixed side, A first elastic member (72) whose tip portion is pressed against the cam cylindrical surface of the first cam portion (70), one end of which is fixed to the fixed side, and the tip portion of which is the second cam portion (71). ) A second elastic member (73) pressed against the cam cylinder surface of De mechanism.