JPH05189703A - Rotating drum device - Google Patents

Abstract

(57) [Abstract] [Purpose] When assembling a rotary drum device, the motor is positioned with high accuracy and the workability is improved. A rotary drum device equipped with a rotary rotary transformer for transmitting a signal from a head attached to the rotary cylinder to the fixed cylinder, a fixed rotary transformer, and a motor for rotating the rotary cylinder. , The rotary side rotary transformer, the fixed side rotary transformer, the motor stator, and the motor rotor are arranged in this order from the center fixed rotation axis so that the rotary transformer can be used for positioning when fixing the motor that requires positioning, The stator of the motor was brought into direct contact with the stationary rotary transformer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary drum device for a video tape recorder. More specifically, the present invention relates to a rotary drum device in which a rotary transformer can be used for positioning when fixing a motor that requires positioning in the assembly process of the rotary drum device.

[0002]

2. Description of the Related Art FIG. 2 is a sectional view showing a conventional rotary drum device. In this figure, 1 is a central fixed rotation axis,
Reference numeral 2 is a fixed rotary transformer, 3 is a rotary rotary transformer, 4 is a motor stator, 5 is a motor rotor, 6 is a fixed cylinder, 7 is a rotary cylinder, and 8 is a shield plate.

In this drawing, a rotary rotary transformer 3 is fixed to a rotary cylinder 7, a fixed rotary transformer 2 is fixed to a fixed cylinder 6, and a fixed rotary is directed outward from a fixed rotary shaft 1 at the center. The transformer 2, the rotary rotary transformer 3, the motor stator 4, and the motor rotor 5 are arranged in this order.

[0004]

Therefore, when it is necessary to center (position) the stator 4 of the motor, the rotary rotary transformer 3 must be avoided and the fixed cylinder 6 must be used for positioning. The shield plate 8 is applied to the outer circumference of the motor against the magnetic noise of the motor, so the shield plate 8 is used for centering.
Had a problem in that workability and assembling accuracy were not obtained.

The present invention has been made in order to solve the above problems, so that the center of the motor can be accurately set by not setting the outer diameter of the unstable shield plate as a standard. The purpose is to

[0006]

A rotary drum device according to the present invention rotates inside a fixed-side rotary transformer so that the outer peripheral surface of the fixed-side rotary transformer can be directly used for centering when mounting a motor. The side rotary transformer is arranged, and the motor stator is directly positioned on the outer peripheral surface of the fixed side rotary transformer.

[0007]

In the rotary drum device according to the present invention, since the stator of the motor can be positioned by directly contacting the outer peripheral surface of the rotary transformer with respect to the assembly of the motor, the accuracy is improved and the workability is improved.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. In this figure, 1 is a fixed rotating shaft at the center, 2
Is a fixed rotary transformer, 3 is a rotary rotary transformer, 4 is a motor stator, 5 is a motor rotor, 6 is a fixed cylinder, 7 is a rotary cylinder, and 8 is a shield plate.

In this figure, a rotary rotary transformer 3 is fixed to a rotary cylinder 7, a fixed rotary transformer 2 is fixed to a fixed cylinder 6, and a rotary rotary is directed outward from a fixed rotary shaft 1. The transformer 3, the fixed-side rotary transformer 2, the motor stator 4, and the motor rotor 5 are arranged in this order. As described above, in the rotary drum device of the present invention, the arrangement of the fixed rotary transformer 2 and the rotary rotary transformer 3 is different from the conventional arrangement. However, as a result, the motor stator 4 and the stationary rotary transformer 2 can be directly contacted with each other without providing a gap, and the stator 4 of the motor can be easily positioned by the stationary rotary transformer 2. .

[0010]

As described above, according to the present invention, the motor can be assembled on the basis of the outer peripheral surface of the fixed-side rotary transformer without using the unstable outer diameter of the shield plate as a standard. The workability can be improved as well.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a rotary drum device according to the present invention.

FIG. 2 is a sectional view showing a conventional rotary drum device.

[Explanation of symbols]

 1 rotary shaft 2 fixed side rotary transformer 3 rotary side rotary transformer 4 motor stator 5 motor rotor 6 fixed side cylinder 7 rotating side cylinder 8 shield plate

Claims (1)

[Claims] 1. A rotary drum including a rotary rotary transformer for transmitting a signal from a head mounted on the rotary cylinder to the fixed cylinder, a fixed rotary transformer, and a motor for rotating the rotary cylinder. In the equipment, the rotary rotary transformer, the fixed rotary transformer, the motor stator, and the motor rotor are arranged in this order from the center fixed rotary shaft so that the rotary transformer can be used for positioning when fixing the motor that requires positioning. In addition, the rotary drum device is characterized in that the stator of the motor is brought into direct contact with the fixed-side rotary transformer.