JPS59168973A - Dust preventing and removing mechanism of carriage - Google Patents

Abstract

PURPOSE:To prevent the increase and the variation of the frictional force of a bearing due to the influence of dust and reduce the number of parts and the increase of weight to make conversion easy, by providing an elastic deforming material which is attached into a cap covering the bearing and is brought into contact with the surface of a rail in the longitudinal direction. CONSTITUTION:A duct removing material 9 is moved on the surface of a rail 1 in accordance with the movement of a carriage 3, and dust on the rail 1 is removed by this operation. A dust-proof cap 8 prevents not only dropped or floated dust from sticking to the outside wheel of a bearing 10 but also dust from penetrating the bearing 10 from gaps of the bearing 10. Since the dust- proof cap 8 is pressed to a shaft 11 with a proper force, attaching parts are not especially required, and it is not slipped off in the normal use. Since the increase of the weight of the part of the dust-proof cap 8 is slight and the dust removing material 9 has the end face brought into contact with the rail 1, the increase of the force of rolling friction is slight. Consequently, the replacement of the dust preventing and removing mechanism is easy, and positioning control and maintenance are made easy.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a dust removal mechanism, particularly to a dust removal mechanism suitable for use in a linear actuator used for driving a head of a recording/reproducing device using a disk-shaped medium.

[Background of the invention]

Conventionally, a linear actuator mounted with a recording/reproducing head used in a magnetic disk device and guided by a bearing has not been equipped with a dust removal mechanism for the rail and the bearing outer ring, and a dust prevention mechanism for the bearing.

Therefore, the desired performance can be achieved when there is no dust at all on the rail, bearing outer ring, or inside the bearing. However, if dust adheres to the surface of the rail or bearing outer ring, or if dust gets inside the bearing, the rollers may There are problems in that the sliding friction force fluctuates, making it difficult to control the positioning of the carriage, or that the carriage swings vertically when riding over dust. Therefore, the purpose is to prevent the magnetic head from crashing, but the housing that houses the actuator must have a sealed structure or a semi-sealed structure that supplies clean air through a filter, which results in a large device. turned into
It had the disadvantage of being expensive. On the other hand, in a device such as an optical disk device in which recording media are frequently replaced, it is difficult to create a hermetic or semi-sealed structure as described above, and the adhesion or contamination of dust cannot be avoided. Therefore, the disadvantage is that the bearing must be sealed and the bearing outer ring and rail surface must be periodically cleaned before operation of the device.

In order for a linear actuator guided by a bearing to move with a constant frictional force, the surfaces of the rail and bearing must have a highly accurate finish, be free of dust, and be free of dust from entering the inside of the bearing. Many things are necessary. As a countermeasure, it is possible to make the housing hermetically sealed or semi-sealed as used in magnetic disk devices, but this makes the device expensive and large, and it becomes difficult to replace the recording medium. Therefore, it is difficult to adopt the above structure in an optical disk device or the like in which recording media are exchanged. Therefore, it is necessary to actively remove the dust that has entered the device. Possible methods include the following:

a. Sweeping with a brush, into the pores! For example, wiping with a mop made of foamed plastic as an elastically deformable material, and blowing with C0 air, satisfies the requirements of cleaning effectiveness and low friction force by using a soft, thin brush with a diameter about the size of a hair, and having a high density and length. But,
The disadvantage is that the structure is complicated and large.

Since b can be in close contact with the rail, it has a great dust-proofing effect, and the frictional force is also small. Furthermore, by making the mounting part into a shape that also serves as a protection for the bearing, and using a structure for mounting by utilizing the bearing's shirt, the increase in weight is small, the number of parts is small, and replacement can be made easy.

C has the disadvantage that compressed air must be provided in the device, which not only increases the size of the device, but also requires sufficient consideration of the safety of the compressed cylinder.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a dust removal mechanism that prevents an increase and fluctuation in the frictional force caused by the influence of dust on the rollers of a bearing, reduces the number of parts for protecting the bearing, increases the weight, and has a structure that is easy to convert. It is in.

[Summary of the invention]

In order to achieve such an objective, the dustproof mechanism according to the present invention has the following features:
A bearing inserted into a shaft, a cap attached to the shaft and surrounding the bearing except for the area where the bearing contacts the rail, and an elastically deformable cap that is attached to the cap and has air holes whose end surface contacts the rail surface in the longitudinal direction of the bearing. It is characterized by being made of wood.

[Embodiments of the invention]

The present invention will be explained below using examples. FIG. 1 is an overview diagram showing a linear actuator equipped with a dust removal mechanism according to the present invention. A magnet 5 is attached to the rail 1 placed parallel to the left and right, and forms a magnetic path together with the foot and the yoke 2. On the other hand, wings 6 attached to the carriage 3 are arranged in the space between the yoke 2 and the magnet 5, and the carriage 3 moves on the rail 1 by passing current through a coil 7 that crosses the magnetic path at right angles. Carriage 3 is
It is supported by four bearings on the upper side and three bearings on the lower side arranged in the dust removal mechanism 4.

FIG. 2(a) is a diagram showing details of the dust removal mechanism 4, as seen from the direction of arrow B in FIG. Figure 2(b)
It is a figure which shows the AA cross section of FIG. 2 (a). A bearing 10 is attached to the shaft 11 inserted into the carriage 3 via a spacer 13, and a dust-proof cap 8 made of thermoplastic resin, for example, is fitted in the shape of a partially cut cylinder with a bottom. It is press-fitted by the joining part 12. A sponge-like dust removal material 9 is attached to the cylindrical inner surface of the dustproof cap 8. Both ends of the dust removal material 9 are connected to the rail 1
is in face-to-face contact.

As the dust removal material 9Fi carriage 3 moves, the rail 1
The dust on the rail 1 is removed by this movement. The dustproof cap 8 prevents falling or floating dust from adhering to the outer ring of the bearing 10, and also prevents dust from falling or floating from adhering to the outer ring of the bearing 10.
It also prevents dust from entering the interior. The dust-proof cap 8 is press-fitted into the shaft 11 by manual force without any tools, for example, so no special parts are required for installation, and it can be removed in a short time, and there is no need to worry about it falling off during normal use. Nor. The increase in the weight of the dustproof cap 8 is slight, and since the dust removal material 9 is in contact with the rail 1 through its end surface, the increase in frictional force caused by the rollers is also slight.

Furthermore, most of the outer ring of the bearing 7 has a dustproof cap 8.
, the bearing 10 is protected from being accidentally hit and damaged when the carriage 3 is installed or removed. Therefore, according to this embodiment, it is easy to replace the dust removal mechanism, and the dust removal function and protection function allow
Since a uniform rolling friction force can be maintained, positioning control and maintenance are easier.

〔Effect of the invention〕

According to the present invention, the number of parts and weight increase are small, and the structure is easy to replace, which prevents dust from adhering to or entering the bearing, and protects the bearing.
Since the M oscillation force can be maintained, the positioning control and maintenance of the linear actuator supported by the bearings is easy9, and there is no need to seal or semi-seal the housing of the device that exchanges the recording medium. This has the effect that devices for exchanging recording media can be made smaller and cheaper.

[Brief explanation of the drawing]

FIG. 1 is a general view of a linear actuator equipped with a dust removal mechanism according to the present invention, and FIGS. 2(a) and 2(b) are a front view and a central sectional view showing an embodiment of the dust removal mechanism according to the present invention. FIG. 3... Carriage, 4... Dust removal mechanism, 8... Dust protection cap, 9... Dust removal material, 10... Bearing,
DESCRIPTION OF SYMBOLS 11... Shaft, 12... Fitting part, 13... Spacer. Agent Patent Attorney Akio Takahashi

Claims (1)

[Claims] 1. A bearing inserted into the shaft, a cap attached to the shaft that covers the area around the bearing except for the vicinity of the rail contact area of the bearing, and an end surface attached to the cap that contacts the rail surface in the front-rear direction of the bearing. 1. A dust removal mechanism for a carriage, comprising an elastically deformable material having pores.