JPH0643840U - Capstan motor - Google Patents

Abstract

(57) [Summary] [Object] An object of the present invention is to form a bearing holder of a capstan motor by bending using a sheet metal. [Structure] A capstan motor 100 faces a stator yoke 2 in which a plurality of coils 4 are arranged at equal intervals on a circumference of a surface 2a around a capstan shaft 3, and the plurality of coils 4 face each other. The magnet 6 is disposed, the rotor yoke 5 that rotates integrally with the capstan shaft 3, and the bearings 9a and 9b that pivotally support the capstan shaft 3 are provided, and are integrally provided on the other surface 2b of the stator yoke 2. The bearing holder 80 is capable of determining the axial position of the capstan shaft 3. The bearing holder 80 is formed by bending a sheet metal, and the bent portions 81, 82 are fitted with the bearings 9a, 9b.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement of a capstan motor used in a VTR device or the like.

[0002]

[Prior art]

 A conventional example of a capstan motor used in a VTR device will be described with reference to FIGS. 2 (a) and 2 (b).

In the conventional capstan motor 1, 2 is a stator yoke formed by using a metal plate, and a lower surface 2 a thereof has a plurality of coils 4 on a circumference around a capstan shaft 3 to be inserted. Are evenly spaced. Reference numeral 5 is a rotor yoke in which a ring-shaped magnet 6 is attached at a position facing the above-described plurality of coils 4, and an output wheel 7 into which a lower end portion 3a of the capstan shaft 3 is press-fitted is integrally attached to the central portion thereof. ing. By passing a current through each coil 4 arranged on the stator yoke 2, electromagnetic induction occurs between these and the magnet 6 on the rotor yoke 5, and the rotor yoke 5 rotates together with the capstan shaft 3. The output wheel 7 integrated with the capstan shaft 3 may be used as a drive source for driving other drive members of the VTR device during rotation.

Reference numeral 8 denotes a resin bearing holder formed by injection molding, and bearings 9a and 9b for pivotally supporting the rotating capstan shaft 3 are fitted to the upper and lower portions thereof, respectively. Then, the lower part of the bearing holder 8 is attached and fixed to the upper surface 2b of the stator yoke 2 described above, whereby the axial position of the capstan shaft 3 can be determined.

The capstan motor 1 is mounted in, for example, a VTR device, and a running magnetic tape T (shown by a chain double-dashed line) is pressed onto a capstan shaft 3 by a pinch roller P (shown by a chain double-dashed line). .

A cap 10 is screwed onto the outer periphery of the upper end 8 a of the bearing holder 8. The lower surface side of the cap 10 is in contact with the upper end portion 3b of the capstan shaft 3, and by adjusting the screwing condition of the cap 10, the height position of the capstan shaft 3 can be changed. The distance d between the plurality of coils 4 arranged in 2 and the magnet 6 attached to the rotor yoke 5 can be adjusted.

[0007]

[Problems to be solved by the device]

 However, in the conventional capstan motor 1, the bearing holder 8 is made of resin. However, when the bearing holder 8 is made by injection molding, the molding conditions are apt to change, and the bearings 8a, 9b are not fitted. Variations in dimensional accuracy were likely to occur. Further, even if the bearing holder 8 is formed with high accuracy, the dimensional accuracy may be lost because the resin increases the degree of contraction or expansion due to heat change due to the temperature increase in the device and is easily deformed. Further, since the resin material has low rigidity, it may be deformed by the pressure force of the pinch roller P, and the capstan shaft 3 may not be supported correctly.

[0008]

[Means for Solving the Problems]

 The present invention solves the above-mentioned problems. A stator yoke in which a plurality of coils are arranged at equal intervals on a circumference of one surface around the capstan shaft, and the stator yoke face the plurality of coils. A magnet is disposed, a rotor yoke that rotates integrally with the capstan shaft, and a bearing that axially supports the capstan shaft are provided. A capstan motor comprising a bearing holder capable of determining a directional position, characterized in that a bent metal plate is used for the bearing holder, and the bare ring is fitted to the bent portion. Providing a stun motor.

[0009]

【Example】

 Hereinafter, the present invention will be described with reference to the drawings.

1A and 1B are views showing an embodiment of a capstan motor according to the present invention. FIG. 1A is a perspective view and FIG. 1B is a sectional view. In this embodiment, the same components as those of the conventional example are designated by the same reference numerals, and detailed description thereof will be omitted.

The capstan motor 100 shown in FIGS. 1A and 1B according to the present embodiment includes a stator yoke 2 in which a plurality of coils 4 are arranged on a lower surface (one surface) 2 a and a ring-shaped magnet 6. The rotor yoke 5 is attached and fixed to the lower end portion 3a of the capstan shaft 3 via the output wheel 7. The bearing holder 80 including the bearings 9a and 9b for pivotally supporting the capstan shaft 3 is the key to the present invention and is as follows.

The bearing holder 80 is formed by bending a metal plate into a substantially U shape, and has bent portions 81 and 82 for mounting the (oilless) bearings 9a and 9b formed on the upper and lower portions thereof. . In this bearing holder 80, the upper bent portion 81 is substantially fan-shaped, and the lower bent portion 82 is substantially circular. Further, the support portion 83 extending in the height direction for connecting the upper and lower bent portions 81 and 82 has a cut surface slightly curved in a crescent shape. The bearing holder 80 is integrally attached to the upper surface (other surface) 2b of the stator yoke 2 at the lower bent portion 82.

The bearings 9a and 9b are fitted in the holes 81a and 82ab formed in the bent portions 81 and 82, respectively, and the capstan shaft 3 is pivotally supported in these holes. A bent portion 84 which is further bent in a U-shape is formed from the bent portion 81 at the upper portion, and a screw N is screwed into the upper surface thereof. The tip of the screw N is in contact with the upper end portion 3b of the capstan shaft 3, and by adjusting the screwing degree of the screw N, the height position of the capstan shaft 3 can be changed. It is possible to adjust the distance d between the plurality of coils 4 arranged in the above and the magnet 6 attached to the rotor yoke 5.

The capstan motor 100 is mounted in, for example, a VTR device, and a running magnetic tape T (shown by a chain double-dashed line) is pressed onto the capstan shaft 3 by a pinch roller P (shown by a chain double-dashed line). .

In the capstan motor 100 of the present embodiment described above, since the bearing holder 80 is formed by bending using a sheet metal, there is an advantage that it can be made more accurately than a resin one. In addition, the degree of shrinkage and expansion due to heat change is smaller than that of a resin material, which makes it difficult to deform. Further, since the bearing holder 80 is improved in rigidity because the sheet metal material is used, it is possible to prevent the capstan shaft 3 from being deformed by the pressing force of the pinch roller P and being unable to correctly support the capstan shaft 3. Further, since the bearing holder 80 can be mass-produced by press working which is inexpensive in manufacturing cost, there is an advantage that the capstan motor 100 is naturally inexpensive.

In the present embodiment, the bearing holder 80 and the stator yoke 2 are formed separately, but for example, a notch is formed in the stator yoke 2 and the notched portion is formed to form the bearing holder. You may think about it.

[0017]

[Effect of device]

 As can be seen from the above description, in the capstan motor according to the present invention, since the bearing holder is formed by bending using a sheet metal, there is an advantage that it can be made more accurately than a resin one. In addition, the degree of shrinkage and expansion due to heat change is smaller than that of resin, which makes it difficult to deform. Moreover, since the bearing holder is improved in rigidity because the sheet metal material is used, there is no possibility that the capstan shaft cannot be correctly supported by being deformed by the pressing force of the pinch roller. In addition, since bearing holders can be mass-produced by press working, which is inexpensive to manufacture, capstan motors are naturally cheaper.

[Brief description of drawings]

1A and 1B are views showing an embodiment of a capstan motor according to the present invention, wherein FIG. 1A is a perspective view and FIG. 1B is a sectional view.

2A and 2B are views showing an example of a conventional capstan motor, in which FIG. 2A is a perspective view and FIG. 2B is a sectional view.

[Explanation of symbols]

 2 stator yoke 3 capstan shaft 4 coil 5 rotor yoke 6 magnets 9a, 9b bearing 80 bearing holder 100 capstan motor

Claims (1)

[Scope of utility model registration request] 1. A stator yoke, in which a plurality of coils are arranged at equal intervals, and a magnet, which is opposed to the plurality of coils, are arranged on a circumference of one surface around a capstan axis.
A rotor yoke that rotates integrally with the capstan shaft, and a bearing that axially supports the capstan shaft are provided and integrally provided on the other surface of the stator yoke to determine the axial position of the capstan shaft. In a capstan motor consisting of a bearing holder capable of, a bent metal plate is used for the bearing holder,
A capstan motor, characterized in that the bearing is fitted in the bent portion.