JPH0345296Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a capstan device for driving a tape in a magnetic recording/reproducing device, and in particular to shortening of the capstan shaft.

[Conventional technology]

FIG. 4 is a longitudinal sectional view of a conventional capstan device, and FIG. 5 is a plan view of the main part of FIG. 4. In the figure, 1 is a capstan shaft, 2 and 3 are metal bearings that rotatably hold both ends of the capstan shaft 1, 4 is a housing that holds the metal bearings 2 and 3 in predetermined positions, 5 is a motor coil, and 6 is a rotor, 7 is a stator that holds the motor coil 5 in a predetermined position, and 8 is a rotor holder that holds the rotor 6 in a predetermined position.
The rotor 6, stator 7, and rotor holder 8 constitute a motor. 9 is a boss that connects the capstan shaft 1 and rotor holder 6; 10 is a tape; 11 is a pinch roller that is placed opposite to the capstan shaft 1 and presses the tape 10 against the capstan shaft 1; 12 is a motor coil 5 and rotor 6; This is a stopper that receives the thrust force generated by the suction force between the

To run the tape 10 in direction a, a pinch roller 11 is pressed with the tape 10 in between against the capstan shaft 1 which is being rotated in direction b by the motor. The load applied to the capstan shaft 1 is borne by the aforementioned metal bearings 2 and 3.

[Problem that the invention attempts to solve]

The conventional capstan device is configured as described above, and since the metal bearing 3 on the side opposite to the motor drive end is configured in a cylindrical shape, it has to be installed outside the range where the pinch roller 11 contacts the capstan shaft 1. First, the capstan shaft 1 becomes long, making it difficult to make products using it thinner.

This invention was made in order to solve the problems of the conventional devices as described above, and the purpose is to provide a capstan device that can shorten the length of the capstan shaft.

[Means for solving problems]

In the capstan device according to this invention, the bearing at the end opposite to the motor drive end is disposed on the opposite side of the pinch roller across the capstan shaft and within the axial contact range between the pinch roller and the capstan shaft. It consists of a V-groove bearing.

[Effect]

In this invention, a V-groove bearing receives a load applied by a pinch roller.

[Example of idea]

An embodiment of this invention will be described below with reference to FIGS. 1 to 3. Figure 1 is a longitudinal sectional view, Figure 2 is a plan view of the main part of Figure 1, and Figure 3 is a sectional view taken along the line - in Figure 1, showing the same parts as Figures 4 and 5. are given the same reference numerals and their explanations will be omitted. In the figure, 3A is a V-groove shaped bearing, which replaces the conventional metal bearing 3.
The bearing 3A is made of a low-friction material such as a metal bearing material or a polymer material, and is provided within the axial contact range of the capstan shaft 1 and the pinch roller 11 and on the opposite side of the pinch roller 11 with the capstan shaft 1 in between. It is being The bearing 3A is fixed to the housing 4 by a screw 13, and the stopper 12 shown in FIGS. 4 and 5 is integrally connected to the bearing 3A.
A stopper 12A corresponding to this is formed.

Now, in order to run the tape 10,
Hold the pinch roller 11 between the capstan shaft 1
When the capstan shaft 1 is pressed, the load applied to the capstan shaft 1 is received by the metal bearing 2 at one end and the V-groove shaped bearing 3A at the other end. By providing the bearing 3A within the range of axial contact between the capstan shaft 1 and the pinch roller 11, the capstan shaft 1 can be shortened and deflection of the capstan shaft 1 due to the pressing of the pinch roller 11 can be prevented. In addition, by providing the bearing 3A on the opposite side of the pinch roller 11 across the capstan shaft 1, the bearing 3A can be attached to the pinch roller 11.
will not interfere with

In addition, in this invention, the term "shaft 3A within the axial contact range between the capstan shaft 1 and the pinch roller 11" includes not only the case where the bearing 3A is completely within the range but also the case where it partially protrudes. Even if a portion of the capstan shaft 1 protrudes, the capstan shaft 1 can be prevented from being bent.

In the above embodiment, the V-shaped bearing 3A and the stopper 12A are formed integrally, but it goes without saying that they can be formed as separate pieces. Further, the bearing 2 does not need to be a metal bearing, and may be another bearing such as a ball bearing.

[Effect of idea]

As described above, according to this invention, the bearing on the side opposite to the motor of the capstan shaft is composed of a V-groove bearing, and this is arranged within the axial contact range of the capstan shaft and the pinch roller. This has the effect of making it possible to shorten the length and make the product thinner.

[Brief explanation of the drawing]

Figure 1 is a longitudinal sectional view of one embodiment of this invention;
The figure is a plan view of the main part of Fig. 1, Fig. 3 is a sectional view along the line - of Fig. 1, Fig. 4 is a longitudinal sectional view of the conventional capstan device, and Fig. 5 is the main part of Fig. 4. FIG. In the figure, 1 is a capstan shaft, 2 is a bearing (metal bearing), 3A is a V-groove shaped bearing, and 11 is a pinch roller. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] In a capstan device equipped with a capstan shaft whose both ends are rotatably supported by bearings and whose one end is rotationally driven by a motor, and a pinch roller disposed opposite to this capstan shaft, the pinch roller on the opposite side from the motor driving end A capstan characterized in that the bearing is a V-groove bearing disposed on the opposite side of the pinch roller across the capstan shaft and within an axial contact range between the pinch roller and the capstan shaft. Device.