JPH0828011B2 - Capstan device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a capstan device such as a tape recorder, and more particularly, to a capstan device adapted to perform a capstan bearing at two positions sandwiching a pinch roller.

2. Description of the Related Art In recent years, tape recorders have tended to be miniaturized, and particularly for portable cassette tape recorders, the tendency is remarkable. Therefore, a battery or the like is often used as a power source and these tape recorders are required to save power in order to prolong the battery life.

In the conventional capstan device, in order to reduce the size and power consumption, the capstan bearing is configured in two positions with pinch rollers sandwiched between them. Especially, in the case of a cassette tape recorder capstan device. Since the bearing housing is inserted into the capstan insertion hole of the cassette, it is necessary to consider the mountability of the cassette and the damage of the magnetic tape.

A conventional capstan device will be described below with reference to the drawings.

5 and 6 are cross-sectional views showing a first conventional capstan device. In the figure, reference numeral 1 denotes a capstan, which is a first bearing 3 and a second bearing 3 which are press-fitted into a bearing housing 2.
Is rotatably supported by the bearing 4. The bearing housing 2 is fixed to the substrate 5. Reference numeral 6 denotes a cap made of a resin material, which is configured to be press-fitted into the tip portion 1a of the capstan 1 so that the convex portion 6a is mounted in the groove 1b of the capstan 1, and the capstan 1 is shown in FIG. It is designed to be held in the state shown in FIG. A pinch roller 7 is configured to be pressed against the capstan 1 and run the magnetic tape 9 of the cassette 8. 10 is a flywheel, which is constructed integrally with the capstan 1.

Next, the mounting operation of the cassette having the above configuration will be described.

As shown in FIG. 6, the pinch roller 7 is the capstan 1
When the cassette 8 is mounted in a stopped state separated from
The cap is inserted in the capstan insertion hole 8a of the cassette 8.
6, the capstan 1 and the bearing housing 2 are inserted and mounted in the state shown in FIG. At this time, the magnetic tape 9 is moved along the inclined portion 6b of the cap 6 and mounted between the pinch roller 7 and the capstan 1. Above cassette 8
When the reproducing operation is carried out with the attached, the pinch roller 7 is pressed against the capstan 1 and the magnetic tape 9 is run as shown in FIG.

 Next, a second conventional example will be described.

FIG. 7 shows a capstan device which is a second conventional example. In the figure, a capstan 11 is rotatably supported by a bearing portion 12a formed in a bearing housing 12 on the upper side and a bearing (not shown) press-fitted on the bearing housing 12 on the lower side. The bearing housing 12 is fixed to a substrate (not shown). 13 is a retaining ring, which is mounted in the groove portion 11a of the capstan 11 and
1 is configured to be retained in the state shown in FIG. 14
Is a pinch roller, which is configured to be pressed against the capstan 11 and to run the magnetic tape 16 of the cassette 15. The bearing housing 12 is fixed to the base plate (not shown) and the lower bearing (not shown) is press-fitted to the first state.
The configuration is similar to that of the conventional example.

Next, the mounting operation of the cassette having the above configuration will be described.

As shown in FIG. 7, the pinch roller 14 is capstan 11
When the cassette 15 is mounted in a stopped state separated from
The retaining ring 1 is inserted in the capstan insertion hole 15a of this cassette 15.
3, the capstan 11 and the bearing housing 12 are inserted and mounted in the same manner as in the first conventional example. At this time, the magnetic tape 16 is moved along the inclined portion 12a of the bearing housing 12 and mounted between the pinch roller 14 and the capstan 11. When the reproducing operation is performed with the cassette 15 mounted, the pinch roller is used as in the first conventional example.
14 is pressed against the capstan 11, and the magnetic tape 16 is run.

Problems to be Solved by the Invention In the first conventional example, when the cap 6 is press-fitted into the distal end portion 1a of the capstan 1, the projection 6a is deformed, etc. Since the capstan 1 is mounted in the groove 1b, the holding force of the capstan 1 is weakened, and there is a problem that the capstan 1 is detached due to a shock or the like when dropped. In order to solve this problem, for example, there is a method of receiving a capstan under the flywheel with a thrust receiving plate or the like, but this has a problem in that it cannot be downsized and thinned and the cost is increased. .

In order to solve these problems, there is a method as in the second conventional example. In this method, the bearing housing 12 is made of die cast zinc or glass fiber to secure the verticality of the capstan. Since it must be formed by using a mixed high-rigidity resin material, and therefore the bearing portion 12a is also made of these materials, the capstan 11 cannot rotate smoothly, and the performance of wah etc. deteriorates. was there. This becomes remarkable especially when used for a long time.

The present invention provides a capstan device that solves the problems described above, can be made smaller and thinner, and can be inexpensively mounted smoothly, and its performance can be stabilized.

Means for Solving the Problems In order to solve the above problems, a capstan device according to the present invention is a capstan and a pinch roller for moving a magnetic tape at a constant speed, and two positions of the capstan where the pinch roller is sandwiched. A bearing housing having a bearing for axially supporting, and a bearing housing having a shape in which the portion where the pinch roller is located is cut out, and mounted on the tip of this bearing housing,
A spacer having an outer shape of a truncated cone and a retaining ring that is mounted in the groove portion of the tip end portion of the capstan and that mounts and holds the capstan in the bearing housing are provided.

Operation According to the present invention, since the capstan is attached and held to the bearing housing by the retaining ring through the spacer with the above-described configuration, the holding force is strong and the capstan does not come off even if an impact such as a drop is applied. Therefore, since it is not necessary to use a thrust receiving plate or the like, downsizing and downsizing can be realized and the cost is low. Moreover, when the cassette is mounted, the cassette and the magnetic tape can be smoothly mounted. Furthermore, since the bearing housing can be formed of a zinc die-cast or a highly rigid resin material mixed with glass fiber, the verticality of the capstan is stabilized. In addition, since the bearing can be configured without forming the bearing housing, the performance of wah and the like is stable.

Embodiment Hereinafter, a capstan device of an embodiment of the present invention will be described with reference to the drawings.

1 and 2 show a capstan device according to a first embodiment of the present invention. In the figure, 21 is a capstan, which is the first bearing press-fitted into the bearing housing 22.
23, and is rotatably supported by a second bearing 24. The bearing housing 22 is formed of a highly rigid resin material mixed with zinc die cast or glass fiber, and is fixed to the substrate 25. A spacer 26 made of a resin material has a truncated cone shape and is inserted into the capstan 21. A retaining ring 27 is mounted in the groove 21a of the capstan 21 and is configured to hold the capstan 21 in the state shown in FIGS. The outer diameter of the retaining ring 27 is formed slightly smaller than the small diameter portion of the spacer 26. Reference numeral 28 denotes a pinch roller, which is configured to be pressed against the capstan 21 so that the magnetic tape 30 of the cassette 29 is run. Reference numeral 31 is a flywheel, which is configured integrally with the capstan 21. Further, the bearing housing 22 is formed with a cutout portion 22a so that the pinch roller 28 can be pressed against the capstan 21.

A cassette mounting operation of the capstan device according to the first embodiment having the above configuration will be described.

As shown in FIG. 2, the pinch roller 28 is capstan 21.
When the cassette 29 is mounted in a stopped state separated from
The retaining ring 2 is inserted into the capstan insertion hole 29a of the cassette 29.
7, the spacer 26, the capstan 21, and the bearing housing 22 are inserted and mounted in the state shown in FIG. At this time, magnetic tape
30 is moved along the inclined portion 26a of the spacer 26 and is mounted between the pinch roller 28 and the capstan 21. When the playback operation is performed with the cassette 29 installed,
As shown in the figure, the pinch roller 28 is pressed against the capstan 21 and the magnetic tape 30 is run at a constant speed.

As described above, according to the embodiment, since the retaining ring 27 mounts and holds the capstan 21 on the bearing housing 22 through the spacer 26, the holding force is strong,
Does not come off even if a shock such as a drop is applied. Further, since the spacer 26 is formed of a resin material to have a truncated cone shape, and the outer diameter of the retaining ring 27 is formed to be slightly smaller than the small diameter portion of the spacer, the cassette 29 is mounted when the cassette 29 is mounted.
29 and magnetic tape 30 can be installed smoothly. Further, since the bearing housing 22 is formed of a highly rigid resin material mixed with zinc die cast or glass fiber, the verticality of the capstan 21 with respect to the substrate 25 is stable. First
Since the bearing 23 can be configured without forming the bearing housing 22, the performance of wah and the like is stabilized.

The retaining ring 27 may be formed of a resin material and may be slit in the radial direction in order to improve the mountability to the capstan 21.

Next, a capstan device according to a second embodiment of the present invention will be described with reference to the drawings.

FIG. 3 and FIG. 4 show a capstan device in the second embodiment of the present invention. In the figure, 41 is a capstan, which is rotatably supported by a bearing spacer 43 and a bearing 44 in which a lower portion 43a is press-fitted into a bearing housing 42.
The bearing housing 42 is formed of a highly rigid resin material mixed with zinc die cast or glass fiber, and is fixed to the substrate 45. The bearing spacer 43 is formed of a resin material having excellent lubricity, and the upper portion 43b has a truncated cone shape. Reference numeral 46 denotes a retaining ring, which is mounted in the groove portion 41a of the capstan 41 and is configured to hold the capstan 41 in the state shown in FIGS. 3 and 4. The outer diameter of the retaining ring 46 is formed to be slightly smaller than the small diameter portion of the upper portion 43b of the bearing spacer 43. Reference numeral 47 is a pinch roller, which is configured to press the capstan 41 and to run the magnetic tape 49 of the cassette 48. 50 is a flywheel, which is configured integrally with the capstan 41. Further, the bearing housing 42 is formed with a notch 42a so that the pinch roller 47 can be pressed against the capstan 41.

The difference from the first embodiment is that the first bearing 23 and the spacer 26 are integrally formed as a bearing spacer 43.

A cassette mounting operation of the capstan device according to the second embodiment having the above configuration will be described.

As shown in FIG. 4, the pinch roller 47 is capstan 41.
When the cassette 48 is mounted in a stopped state separated from
The retaining ring 4 is inserted into the capstan insertion hole 49a of the cassette 48.
6, the bearing spacer 43, the capstan 41, and the bearing housing 42 are inserted and mounted in the state shown in FIG. At this time, the magnetic tape 49 is moved along the inclined portion 43c of the bearing spacer 43 and mounted between the pinch roller 47 and the capstan 41. When the reproducing operation is performed with the cassette 48 mounted, the pinch roller 47 moves to the capstan as shown in FIG.
It is crimped to 41 and the magnetic tape 49 is run at a constant speed.

As described above, according to the embodiment, the first bearing 23 and the spacer 26 of the first embodiment are integrally formed, and the bearing spacer
Since it is 43, it is inexpensive with a simple configuration.

EFFECTS OF THE INVENTION As described above, according to the present invention, since the capstan is attached to and retained by the bearing housing by the retaining ring via the spacer, the retaining force is strong and the capstan does not come off even when an impact such as a drop is applied. Therefore, since it is not necessary to use a thrust receiving plate or the like, it is possible to realize downsizing and thinning, and it is inexpensive. In addition, the cassette and the magnetic tape can be smoothly mounted when the cassette is mounted. Furthermore, since the bearing housing can be formed of a zinc die-cast or a highly rigid resin material mixed with glass fiber, the verticality of the capstan is stabilized.

Further, since the bearing can be constructed without forming the bearing housing, the performance is stable against wow and the like.

[Brief description of drawings]

FIG. 1 is a sectional view showing a cassette mounted state of a capstan device in a first embodiment of the present invention, FIG. 2 is a partial sectional view of a main part showing a state when the same is mounted, and FIG. 3 is a sectional view of the present invention. FIG. 4 is a sectional view showing a state where the capstan device of the second embodiment is mounted on a cassette, FIG. 4 is a partial sectional view of a main portion showing a state when the cassette is mounted, and FIG. 5 is a capstan device of the first conventional example. 6 is a sectional view showing a state where the cassette is mounted, FIG. 6 is a partial sectional view of a main part showing a state when the cassette is mounted, and FIG. 7 is a sectional view showing a state when the cassette of the second conventional capstan device is mounted. It is a fragmentary sectional view of a part. 21,41 …… Capstan, 22,42 …… Bearing housing, 23
...... First bearing, 26 …… Spacer, 27,46 …… Retaining ring, 2
8,47 …… Pinch roller, 29,48 …… Cassette, 30,49 ……
Magnetic tape, 43 ... Bearing spacer.

Claims (2)

[Claims] 1. A capstan and a pinch roller for moving a magnetic tape at a constant speed, and a bearing for axially supporting two positions of the capstan sandwiching the pinch roller, and a portion where the pinch roller is located is notched. A bearing housing having a curved shape, a spacer that is mounted on the tip of this bearing housing and has a truncated cone shape on the outside, and a groove on the tip of the capstan that is mounted and retained on the bearing housing. And a retaining ring for performing the above, and the capstan device is configured to be attached and held by the retaining ring to the bearing housing via the spacer. 2. The capstan device according to claim 1, wherein the spacer is formed integrally with a bearing formed in the bearing housing.