JPH02135628A - Slip ring for vtr drum - Google Patents

Abstract

PURPOSE:To stably supply electricity to a rotating subject to be supplied with electricity, by providing such constitution that a plurality of pressing members for pressing an electrical conductive member to the subject to be supplied with electricity are capable of rotation relative to each other and make contact with each other. CONSTITUTION:A rubber plate 5 is cut out by a cutout wire 13 so that pressing members are capable of rotation relative to each other and also make contact with each other. Frictional forces produced by relative rotation between the pressing members therefore have the effect of damping vibration of a plate spring 2 and hence stable contact between a chip and a shaft can be obtained. Electricity can thus stably be supplied to a rotating subject 3 to be supplied with electricity.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a slip ring that supplies current to, for example, a rotating drum in order to drive the head of a VTR.

[Prior art] Fig. 2 is a diagram from the publication (NEC Gi 1 [Vol. 13. No.
11, pp.

102-105, 198B) is a partial cross-sectional configuration diagram showing how the slip ring for a drum is used.

However, to make future explanations easier, the drum and slip ring parts are shown enlarged. In the figure, (1) is a conductive member, such as a tip made of a conductive material with good lubricity, and (2) is, for example, a leaf spring, which is a shaft of a power-supplied object that rotates the tip (1) by utilizing its elasticity. (3) is imposed. (4) is a leaf spring fixture, (5) is a rubber plate that damps the vibration of the leaf spring (2), and the chip (1)
In order to improve the followability to the shaft of the leaf spring (2),
The leaf spring (2) and the rubber plate (5
The suppressing member constitutes a suppressing member, and the suppressing member and the conductive member (1) constitute a slip ring. (6) is a slip ring fixing device, and the slip ring is attached to the lower drum on the stationary side (
7) Attached to the! Pneumatically and mechanically contacted. The stator coil (not shown) of the drive motor is attached to the lower drum (6), and the rotor magnet (not shown) is attached to the shaft (3), and both constitute the motor, which has an upper rolling bearing (8) and a lower rolling bearing. (9)
The shaft (3) and the upper drum (10) which rotate together with the shaft (3) are rotated through the shaft (3). Two read/write heads (12) are mounted on this upper drum (10) and are driven up and down by an actuator (11).
(only one shown) is attached. Note that a plurality of stationary heads (not shown) are also attached to the upper drum (10).

In recent years, the spread of home VTRs has been remarkable.
Demand for speed search is increasing. During special playback, the relative speed between the magnetic head and the tape changes, resulting in misalignment with the recording track and bar noise appearing in the reproduced image. As the tape speed increases, the number of bar noise increases and the reproduced image becomes difficult to see. In order to eliminate this bar noise, an actuator (11) is used to move the head (12) up and down in synchronization with the rotation of the upper drum (10) during special playback to follow a predetermined track. A slip ring made of a conductive member (1) and a pressing member supplies current to the actuator (11).

Note that the three heirs of the slip ring each have a common ground that is the input and return to the two actuators.

[Problem K1 that the invention attempts to solve] The conventional slip ring is configured as described above.
The slip ring needs to be in stable contact with the shaft at all times to supply current to the actuator. However, depending on the rotation speed of the shaft, the leaf spring resonates,
The tip and shaft will separate. In order to prevent this, a rubber plate (5) is attached to the leaf spring, but it was found that its vibration damping effect was not sufficient.

This invention was made in order to solve this problem, and it is a VTR that stably contacts a rotating power supply object and supplies power.
The purpose is to obtain a slip ring for drums.

[Means for Solving the Problems] A slip ring for a VTR drum according to the present invention is composed of a plurality of conductive members and a plurality of pressing members that press the conductive members against a power-supplied object. The structure is characterized in that the members are configured to be able to move relative to each other and to come into contact with each other.

[Function] The pressing member of the present invention is capable of relative movement, and the frictional force caused by this relative movement has a damping effect on the vibration of the leaf spring of the suppressing member, so that the vibration of the leaf spring is damped more quickly. This allows for more stable contact between the tip and the shaft.

[Embodiment] Fig. 1 is a partial cross-sectional configuration diagram showing the state of use of a slip ring for a VTR drum according to an embodiment of the present invention. This is the cut line provided on the rubber plate (5). Rubber plate (5)
By separating and separating each leaf spring,
Relative movement between the pressing members becomes possible, and the frictional force caused by this relative movement has a damping effect on the vibration of the leaf spring, so that more stable contact between the tip and the shaft can be obtained.

Note that the shape of the above-mentioned separation may be any shape as long as the respective leaf springs are in contact with each other, and the suppressing member is not limited to the configuration of a leaf spring and a rubber plate.

[Effects of the Invention] As explained above, the present invention is configured with a plurality of conductive members and a plurality of pressing members that press the conductive members against a power-supplied object, and in which the pressing members are controlled by the relative movement between the respective suppressing members. By using a slip ring that is capable of contacting a rotating power supply object and is configured to contact the same, it is possible to obtain a slip ring for a VTR drum that stably contacts and supplies power to a rotating power supply target.

[Brief explanation of the drawing]

FIG. 1 is a partial cross-sectional configuration diagram showing the state of use of a slip ring for a VTR drum according to an embodiment of the present invention, and FIG.
FIG. 2 is a partial cross-sectional configuration diagram showing the state of use of a conventional slip ring for a VTR drum. In the figure, (1) is a conductive member, (2) is a leaf spring, (
3) is a rotating power supply object, (5) is a rubber plate, and (13) is a separation line. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Claims] A device composed of a plurality of conductive members and a plurality of pressing members that press the conductive members against a power-supplied object, characterized in that the pressing members are configured to allow relative movement between the pressing members and to come in contact with each other. Slip ring for VTR drum.