JP2002334493A - Capstan device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a capstan device which prevents abutment of an adjacent cassette door to a rotary cylinder, etc., by the deformation of the cassette door, without providing a special guide member. SOLUTION: A capstan shaft 1 is rotatably held by a pair of radial direction bearings 2a and 2b fixed to a bearing holder 8, and a thrust bearing 12 for the capstan shaft 1 is provided at the bearing holder 8. The guide which blocks the abutment of cassette covers 10 and 11 of a magnetic tape cassette 9 to the rotary head cylinder is integrally formed at the thrust bearing 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a capstan device in a rotary head type magnetic recording / reproducing apparatus.
In particular, it is characterized by the configuration of the thrust bearing configured for the purpose of miniaturization.

[0002]

2. Description of the Related Art Conventionally, in a rotary head type magnetic recording / reproducing apparatus, a magnetic tape cassette to be mounted is brought closer to a rotary head cylinder or a capstan to reduce the size of the apparatus. FIG. 3 is a diagram showing an initial position when the cassette is inserted, 9 is a cassette housing, 15 is a capstan unit, and 16 is a rotary head cylinder unit. FIG. 4 is a view in which the cassette housing 9 has been moved to a predetermined mounting position. Become a relationship.

In this state, when an external force is applied from outside the device,
Since the cassette lid abuts on the rotary head cylinder unit 16 and the capstan unit 15, particularly, the rotary head cylinder unit 16 is weak against external force. A guide member is provided on the thrust bearing separately from the thrust bearing.

Hereinafter, the configuration will be described with reference to the drawings. FIG. 5 is a sectional view of a conventional capstan device. Reference numeral 7 denotes a substantially disk-shaped back plate made of a magnetic material, which is fixed to a chassis (not shown) made of aluminum. Reference numeral 8 denotes a substantially U-shaped bearing holder fixed to the back plate 7.

[0005] 1 is a capstan shaft, 2a,
Reference numeral 2b denotes a radial bearing that supports the capstan shaft 1 in the radial direction, and is fixed to the bearing holder 8 at a predetermined interval.

Reference numeral 4 denotes a disk-shaped rotary plate fixed to the lower end of the capstan shaft 1, reference numeral 3 denotes an annular rotor magnet fixed on the rotary plate 4, and reference numeral 5 denotes a rotor magnet. A drive coil is fixed to the back surface of the back plate 7 via a printed wiring board 6 so as to face with a predetermined gap. That is, the rotor magnet 3 and the drive coil 5
Constitutes a motor for driving the capstan shaft 1.

The capstan shaft 1 is rotatably supported in the radial direction by bearings 2a and 2b fixed at a predetermined position by a bearing holder 8, and the capstan shaft 1 is arranged to face the rotor magnet 3. The thrust bearing 12 is urged upward by magnetic attraction between the back plate 7 and the thrust bearing 12 to maintain the gap between the coil 5 and the magnet 3 at a predetermined interval against the urging force. It is arranged and fixed on the upper part of the bearing holder 8. 9 is a cassette housing in which a magnetic tape is wound between a pair of reels, and 10 and 11 are cassette lids attached to the cassette housing 9.

Further, a guide 13 formed at a certain distance from the cassette lids 10 and 11 is provided on the thrust bearing 12. With such a configuration, the cassette lid 10,
Even if 11 is deformed, it is received by the guide 13 and further deformation is prevented, thereby preventing the rotating head cylinder and the like from coming into contact with each other.

In the rotary head type magnetic recording / reproducing apparatus, a magnetic tape drawn in parallel from a reel is spirally wound around a rotary head cylinder, and the magnetic tape is parallel and at the same height with the other magnetic tape. Since it is necessary to return to the reel, the vertical post and the inclined post are appropriately arranged on the traveling path of the magnetic tape. Of these inclined posts,
Post 1 placed close to capstan shaft 1
In the case of No. 4, conventionally, as shown in FIG. 6, the post 14 was bonded and fixed to the side surface of the capstan bearing 8 with an adhesive.

[0010]

In the rotating head type magnetic recording / reproducing apparatus thus miniaturized, peripheral parts come into contact with precise and weak parts such as a rotating head cylinder due to stress from the surroundings. Cause deformation and adjustment fluctuation,
There is a problem that the specified function is impaired. And increased costs.

[0011] In addition, by providing a slanting post near the capstan shaft for returning the tape to the cassette reel before and after the magnetic tape is spirally wound around the rotary head cylinder by reducing the size, the capstan bearing is used. There is no space for press-fitting, and a post is bonded to the side surface of the capstan bearing, which increases the number of assembly steps.

[0012]

In order to solve the above-mentioned problems, the capstan device of the present invention has a guide shape integrally added to the thrust bearing of the capstan, so that a new guide member is not provided. And a guide function for preventing the cassette lid attached to the cassette housing from contacting the rotary head cylinder.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is characterized in that a capstan shaft is rotatably held by a pair of radial bearings fixed to a bearing holder at a predetermined interval, and the capstan shaft is fixed to the bearing holder. In a capstan device provided with a thrust bearing of the capstan shaft at an upper part, a guide for preventing a cassette lid of a magnetic tape cassette from contacting a rotating head cylinder is integrally formed on the thrust bearing. This is a capstan device.The guide shape is also added to the thrust bearing of the capstan integrally, so that the cassette lid attached to the cassette housing comes into contact with the rotary head cylinder without providing a new guide member. Can be prevented.

According to a second aspect of the present invention, there is provided a cap according to the first aspect, wherein a post for restricting the running of the magnetic tape is press-fitted into an engagement hole formed in the thrust bearing. It is a stun device, and it is possible to place and fix the post near the capstan shaft without taking a costly construction method such as bonding by pressing and fixing the post into the engagement hole formed in the thrust bearing. it can.

(Embodiment) The first aspect of the present invention will be described below.
An embodiment of the invention described in claim 2 will be described with reference to FIGS. 1 and 2, the same components as those of the above-described conventional configuration are denoted by the same reference numerals.

The difference between the present embodiment and the above-described conventional structure is that the thrust bearing 12 itself has a guide function. That is, the thrust bearing 12 and the guide 13 of the conventional configuration are integrally formed.

With such a configuration, even if the cassette lids 10 and 11 are deformed by an external force, the cassette lids 10 and 11 are received by the thrust bearing 12, and can be received without a guide provided by another member conventionally provided. It is possible to prevent the rotating cylinder and the like coming into contact with each other.

Next, an embodiment of the invention described in claim 2 of the present invention will be described with reference to FIG. Post 1 that is placed close to the capstan among the inclined posts
In No. 4, an engaging hole is formed in the thrust bearing 12 having the above-described guide function, and the post 14 is pressed into the engaging hole. By adopting this configuration, the inclined post 14 can be arranged and fixed in the vicinity of the capstan shaft without using a construction method that requires an operation cost such as bonding.

[0019]

As described above, the capstan device according to the present invention can prevent contact with a rotating cylinder or the like due to deformation of an adjacent cassette door without providing a special guide member.

[Brief description of the drawings]

FIG. 1 is a sectional view of a thrust bearing portion of a capstan device according to an embodiment of the present invention.

FIG. 2 is a side view of a partially cutout of the capstan device.

FIG. 3 is a plan view showing a tape cassette position in a tape cassette mounting initial state of a conventional rotary head type magnetic recording / reproducing apparatus.

FIG. 4 is a plan view showing a position of the tape cassette of the rotating head type magnetic recording / reproducing apparatus in a state where the tape cassette is mounted at a predetermined position;

FIG. 5 is a sectional view of a conventional capstan device.

FIG. 6 is a partially cutaway side view of a conventional capstan device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Capstan shaft 2a, 2b Radial bearing 3 Rotor magnet 4 Rotating plate 5 Coil 6 Printed circuit board 7 Back plate 8 Bearing holder 9 Cassette housing 10, 11 Cassette lid 12 Thrust bearing 13 Guide 14 Post 15 Capstan unit 16 Cylinder unit

Claims (2)

[Claims] 1. A capstan having a capstan shaft rotatably held by a pair of radial bearings fixed to a bearing holder at a predetermined interval, and a thrust bearing of the capstan shaft provided above the bearing holder. A capstan apparatus, wherein a guide for preventing a cassette lid of a magnetic tape cassette from contacting a rotating head cylinder is integrally formed on the thrust bearing. 2. The capstan device according to claim 1, wherein a post for restricting running of the magnetic tape is press-fitted and fixed to an engagement hole formed in the thrust bearing.