JPH041983A - Support mechanism for reciprocating motion body - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Summary] A highly rigid bearing related to a support mechanism for a reciprocating body, particularly a support mechanism for a reciprocating body (hereinafter referred to as a carry nozzle) of an optical head such as an optical disk device. The purpose of this mechanism is to provide a carriage support mechanism that can secure a space for the carriage to fit in, and that can reduce the weight of the means for applying preload to the bearings. , two guide rollers each having a V-shaped groove in contact with the outer circumferential surface of the one guide rail are provided on an end surface of the reciprocating body facing one of the guide rails and are rotatable at a fixed distance apart from each other in the movement direction. A pair of guide rollers are provided on an end surface of the reciprocating body that is pivoted on the body and is guided while applying a preload to the other guide rail, corresponding to the intermediate portion of the constant size and facing the other guide rail. The pair of guide rollers includes a pair of dish-shaped wheels each having a conical surface, which are mounted on the same shaft with their conical surfaces facing each other so as to be slidable in the axial direction and rotational direction relative to the shaft. Means is provided for pressing and urging the pair of dish-shaped wheels to approach each other in the axial direction, and the outer circumferential surface of the other guide rail contacts the V-shaped groove formed by the conical surfaces facing each other. Arrange and configure as follows.

[Industrial application field]

The present invention relates to a support mechanism for a reciprocating body, and more particularly to a support mechanism for a carriage of an optical head of an optical disk device or the like.

In recent years, as optical disk devices have become faster to access, there has been a demand for lighter optical heads. As one way to reduce the weight, there is a demand for a lighter support mechanism for the carriage that constitutes the optical head.

[Conventional technology]

FIG. 5 is a diagram of a conventional carriage support mechanism.
FIG. 5(a) is a plan view, FIG.

Hereinafter, FIG. 5 will be explained with reference to FIG. 6.

In each figure, guide rails 1 and 2 are arranged in parallel at regular intervals, and at least one end of each is fixed to a base of an apparatus (not shown). In the case of this example, the cross section is circular with the same diameter, and the guide rail is formed in a linear shape with high accuracy. Reference numeral 3 denotes a carriage (reciprocating body) on which an optical head, etc. is mounted, and is driven reciprocally in the direction of arrow P by a voice coil motor, etc., but these mounted parts and drive mechanism are not related to the present invention. Description is omitted.

Two sets of kite rollers 4 and 5 are pivoted at a required interval along the movement direction (direction of arrow P) on the end face of the carriage 3 facing one guide rail 1, and are driven to rotate relative to the guide rail 1. It can be installed freely. The end surface of the carriage 3 facing the other guide rail 2 corresponding to the intermediate position between the two sets of guide rollers 4 and 5 is guided while applying a preload to the guide rail 2 in the direction of arrow Q. A set of guide rollers 6 is arranged.

The means for applying preload uses a leaf spring 8, one end of which is fixed to the end surface of the carriage 3 via a spacer 7, and the other end is elastically biased to press against the guide rail 2. A guide roller 6 is attached to the guide rail 2 at the other end of the leaf spring 8.
This is done by attaching it so that it can rotate freely.

Each of the guide rollers 4, 5.6 has the same structure, but the structure of the guide roller 6, for example, will be described as a typical example.
It consists of a bearing support 63 in which the bearings 62 are installed at right angles by means such as screwing, and a pair of bearings 64 and 65 that are rotatably fitted to each axis of the bearing support 63, and the surface of each bearing is connected to both guide rails. The guide rail 2 is arranged so as to be in contact with the circular outer circumferential surface of the guide rail 2 in a direction perpendicular to it at an angle of 45 degrees with respect to a line connecting the centers of the guide rails.

With the above configuration, the carriage 3 can be moved to both guide rails 1.
2, it can be smoothly reciprocated in the direction of arrow P by a voice coil motor (not shown) or the like.

[Problem to be solved by the invention]

The material of the leaf spring 8 is stainless steel or phosphor bronze, and the weight of the leaf spring 8 is approximately 1 of the weight of the movable part of the carriage 3.
' / 8, and is one of the causes that hinder weight reduction. Furthermore, since the leaf spring 8 extends in the direction of movement with one end supported, its tip, that is, the mounting position of the guide roller 6, lacks rigidity in directions other than the preload direction, and has the disadvantage of being vulnerable to external disturbances.

Further, since the pair of bearings 64 and 65 have an inclination of 45 degrees, there is a drawback that bearings with high rigidity cannot be used due to restrictions on the set of dimensions in the height direction.

The present invention has been made in view of the above-mentioned conventional drawbacks, and aims to provide a carriage support mechanism that can secure a space in which a highly rigid bearing can be accommodated, and can reduce the weight of a means for applying preload to the bearing.

[Means to solve the problem]

FIG. 1 is a diagram showing an embodiment of the present invention. - In a reciprocating body 3 that moves while being guided by guide rails 1.2 arranged in parallel at regular intervals, one guide rail 1. Two guide rollers 9 and 10 each having a V-shaped groove in contact with the outer circumferential surface of the guide rollers 9 and 10 are rotatably mounted at a fixed distance apart from each other in the direction of movement, and the other guide roller 9 and 10 are rotatably mounted at a distance of a certain distance in the direction of movement. A pair of guide rollers 11 are provided on the end face of the reciprocating body 3 facing the rail 2, and are guided while applying a preload to the other guide rail 2, and the pair of guide rollers 11 have a pair of conical surfaces. A pair of disc-shaped wheels 12.1.3 having conical surfaces facing each other are mounted on the same shaft 14 so as to be slidable in the axial direction and rotational direction relative to the shaft, and the pair of disc-shaped wheels 12.1. means 15 for pressing and biasing the guide rail 2 so that the conical surfaces approach each other in the direction shown in FIG. Configure.

[For production]

In the present invention, the guide roller 9.10 includes the guide rail 1.
By rotatably mounting two guide rollers 9 and 10 having V-shaped grooves in contact with the outer circumferential surface of the
In order to reduce the size of the guide roller 11, a pair of disc-shaped wheels 12 and 13 are mounted on the same shaft 14 with a pair of conical surfaces facing each other so as to be slidable in the axial direction and in the direction of rotation relative to the shaft. , the guide rail 2 that is in contact with the V-shaped groove formed by the conical surfaces facing each other is pressed in the direction of arrow Q by means (spring 15) that presses and urges them to approach each other in the axial direction. It is possible to reduce the weight and use a highly rigid bearing within the constraints of the height dimension Ho.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail using concave surfaces.

Note that, in order to make the explanation of the configuration and operation easier to understand, the same parts are given the same reference numerals throughout all the figures, and repeated explanation thereof will be omitted.

FIG. 1 is a diagram showing an embodiment of the present invention, and FIG.
) shows a plan view, and FIG. 1(b) shows a BB' sectional view. FIG. 2 is an enlarged view of the main part of FIG. 1, and FIG. 1 will be explained below with reference to FIG.

In both figures, 9, 10 and 11 are guide rollers corresponding to 4, 5 and 6 in FIG. 5, respectively. The guide rollers 9 and 10 have the same structure and rotate as a result of the guide rail 1. Two guide rollers 9 and 10 have a V-shaped groove in contact with the outer peripheral surface of the guide rail 1 on the end surface of the carriage 3 facing the guide rail 1. V-shaped groove wheels 91 and 101 are each rotatably mounted at a fixed distance apart in the direction of movement.

92 and 102 are shafts slidingly connected to the V-shaped groove wheels 91 and 101, respectively, and 31.32 are shafts 92 and 102, respectively.
These are a pair of fastening seats that protrude from the top and bottom of the end face of the carriage 3 for pivotally mounting the carriage 3.

The guide roller 11 has a function of being driven to rotate without applying a preload to the guide rail 2, and the guide roller 11 has a function of being driven to rotate without applying a preload to the guide rail 2.
A set of guide rails 2 and 3 are provided on the end face of the carriage 3 facing the other guide rail 2 corresponding to the distance between the guide rails 01, that is, the intermediate portion of a constant dimension.

The pair of guide rollers 11 can slide together a pair of dish-shaped wheels 12 and 13 having conical surfaces on the same shaft 14 in the axial direction and in the direction of rotation relative to the shaft, with the conical surfaces facing each other. At the same time, a means for urging the pair of disc-shaped wheels to approach each other in the axial direction, such as a coiled spring 15, is provided by being fitted onto the shaft 14, and the shaft 14 is arranged so that the carriage 3 faces the guide rail 2. The guide rail 2 is pivoted to a pair of fastening seats 33 protruding from the top and bottom of the end surface, and the outer circumferential surface of the guide rail 2 is in contact with a V-shaped groove formed by opposing conical surfaces of the dish-shaped wheels 12 and 13. It is located in

With this structure, the guide rail 2 can hold the carriage 3 while receiving a pressing force in the direction of the arrow Q by the action of the spring 15, and can guide it smoothly in the direction of the arrow P. It can be made smaller like Ho. Further, since each guide roller has a simple shape, it can be formed from a highly rigid material.

Note that 93, 94 and 14b are washers having a spacer function to reduce friction, and 14a is a spring 15.
This is a washer to reduce friction between the

Also, a guide roller 9 rotates following the guide rail 1.
10 can be replaced with a linear ball bearing developed for linear motion if the guide rail 1 has good linear accuracy.

FIG. 3 shows an embodiment (part 2) of the present invention. The difference between the figure and FIG. 2 is that the dish-shaped wheels 12 and 13 constituting the guide roller 11 are replaced with dish-shaped ball hair rings 12a and 13a each having a conical surface, and the wing 15 is replaced with a dish-shaped Beaufret bearing 12a. and the plate-shaped hole bearing 13a.
The point is that it is composed of two springs 15b that press down. Dish-shaped ball hair ring 12a.

The difference is that the guide roller lla is constructed by forming the shaft 14 so that it can be slidably fitted to the shaft 13a, thereby allowing the guide roller lla to rotate more smoothly as a result of the guide rail 2.

FIG. 4 shows an embodiment (part 3) of the present invention. The difference between this figure and FIG. 2 is that the pair of fastening seats 33 are replaced with a single fastening seat 34, and a shaft 14 is slidably supported vertically on the fastening seat 34, and a pair of fastening seats 34 are supported on this shaft 14 in a slidable manner. Disc-shaped wheels 12 and 13 each having a conical surface are mounted on the same shaft 14 with their conical surfaces facing each other so as to be slidable in the axial direction and in the direction of rotation with respect to the shaft, and the pair of disc-shaped wheels 12 .13 to approach in the axial direction, for example, a coiled spring 15 is fitted and inserted into the shaft 14, and both ends of the shaft 14 are provided with stopper screws 14c, 1.
4d to lock the spring 15 and guide roller l.
lb is different in that the guide rail 2 is arranged so that the outer circumferential surface of the guide rail 2 is in contact with a V-shaped groove formed by opposing conical surfaces.

In this case, the thickness of the fastening seat 34 in the axis 14 direction needs to be set shorter than the facing distance between the two dish-shaped wheels, which is determined when the conical surfaces of the two dish-shaped wheels 12 and 13 come into contact with the outer peripheral surface of the guide rail 2. be.

Further, it is also possible to provide one spring 15 on each of the upper and lower sides as shown in FIG.

The configuration of the present invention is not limited to the above-described configuration, and although not shown, a first guide roller 9.10 in FIG.
A combination configuration using the guide roller 11 shown in the figure, the guide roller lla shown in FIG. 3, or the guide roller llb shown in FIG. 4 is also possible.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, it is possible to apply preload to the guide roller without using plate springs.
The weight of moving parts can be significantly reduced. In addition, there is a margin for selecting guide rollers with high rigidity, which has the effect of contributing to improving the performance of the optical disk device.

[Brief explanation of the drawing]

Fig. 1 is an embodiment of the present invention (Part 1), Fig. 2 is an enlarged view of the main part of Fig. 1, Fig. 3 is an embodiment of the present invention (Part 2), and Fig. 4 is an embodiment of the present invention. (Part 3) FIG. 5 is a diagram of a conventional carriage support mechanism, and FIG. 6 is an enlarged view of the main part of FIG. 5. In FIG. 1, l and 2 are guide rails, 3 is a carriage (reciprocating body), 9, 10, and 11 are guide rollers, 12 and 13 are dish-shaped wheels, 14 is a shaft, and 15 is a pressing means ( springs) are shown respectively. (b + 8 - 8' chutai fI figure O light, N Daiojita J (-inl) Fig. 1 2〃ite Shi-ru (Q) flat curved figure I pressure rice AY'87 to I 1000 p [Kari 1 Figure 5 Figure 13g4tj i to roller leak invention, 71 ￥ Zushi J (2 of 2) Figure 3 u! Fig. 4 6 fj' itoko [)-7 Chia 51 yen l-q character 9P stock scale diagram m6 diagram

Claims (1)

[Claims] In a reciprocating body (3) that moves guided by guide rails (1, 2) arranged in parallel at regular intervals, the reciprocating body faces one of the guide rails (1). Two guide rollers (9, 10) each having a V-shaped groove in contact with the outer circumferential surface of the one guide rail are rotatably mounted on the end face of the guide rail at a fixed distance apart from each other in the direction of movement. The other guide rail (corresponding to the middle part of the dimension)
A pair of guide rollers (11) that are guided while applying a preload to the other guide rail are provided on an end surface of the reciprocating body facing the reciprocating member 2), and the pair of guide rollers (11) are guided by applying a preload to the other guide rail.
is a dish-shaped wheel (12, 1) having a pair of conical surfaces.
3) with the same axis (14
) is provided with a means (15) for slidingly fitting the pair of dish-shaped wheels in the axial direction and in the direction of rotation relative to the shaft, and pressing the pair of dish-shaped wheels toward each other in the axial direction; A support mechanism for a reciprocating body, characterized in that the outer circumferential surface of the other guide rail is arranged so as to be in contact with V-shaped grooves formed by opposing guide rails.