JPH0452827Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a static electricity eliminator for a tape recorder that eliminates oilless metal by supporting a capstan shaft on a cylindrical bearing integrally formed on a synthetic resin substrate. .

(Prior art) A head panel made of a metal plate is mounted on a synthetic resin substrate so as to be able to reciprocate, an oil-less metal is fixed to the substrate, a capstan shaft is supported there, and a torsion for returning the head panel is attached. There is known a device in which static electricity around the capstan shaft is removed by electrically connecting the head panel and the oil-less metal via a spring (Utility Model Publication No. 2-10577).

On the other hand, in order to further simplify the structure, an attempt has been made to support the capstan shaft with a cylindrical bearing part integrally formed on a synthetic resin substrate, excluding the oil-less metal.

(Problem to be solved by the invention) When oil-less metal is removed in order to simplify the configuration of a tape recorder using a synthetic resin substrate, a torsion spring for returning the head panel is used to move around the capstan shaft. To eliminate static electricity, the spring must be brought into direct contact with the capstan shaft.

However, the torsion spring for returning the head panel requires a certain degree of strong elastic force in order to perform its original function of returning the head panel, so if such a strong spring is brought into direct contact with the capstan shaft, the capstan will The load on the shaft increases, causing uneven rotation. Additionally, the spring contact portion heats up and runs out of oil, causing noise. Furthermore, there were other problems such as accelerated wear of the spring contact portion, resulting in a shortened lifespan.

The present invention was developed in view of the above circumstances, and although it simplifies the configuration by eliminating oil-less metal and eliminates static electricity around the capstan shaft by using a torsion spring for returning the head panel, the capstan Static electricity removal for tape recorders that suppresses the increase in load on the shaft and prevents uneven rotation, suppresses heating and prevents oil loss, prevents noise generation, and also avoids shortening the life of the capstan shaft. The purpose is to provide equipment.

(Means for Solving the Problem) In order to achieve the above object, the present invention consists of a reciprocating head panel made of a metal plate and a torsion spring for returning the head panel that biases the head panel in the return direction at one end, made of synthetic resin. In a tape recorder that is mounted on a printed circuit board and has a cylindrical bearing part that supports a capstan shaft formed integrally with the board, a projection is provided on the board near the cylindrical bearing part, and the head panel is attached to the projection. An intermediate coil portion of a torsion spring for removing static electricity, which has a smaller elastic force than a torsion spring for returning, is fitted, one end of the torsion spring for removing static electricity is brought into sliding contact with the outer periphery of the capstan shaft, and the other end is fitted. The other end of the torsion spring for returning the head panel is locked.

(Function) The head panel and the capstan shaft are electrically connected via a torsion spring for returning the head panel and a torsion spring for removing static electricity, which has a smaller elastic force, and static electricity generated around the capstan shaft is eliminated. removed.

(Example) Fig. 1 is a plan view showing the mechanical part of a tape recorder, and Fig. 2 is an exploded perspective view of the same, in which a capstan shaft 2 penetrating vertically is located approximately in the middle of a synthetic resin substrate 1. 1 and is rotatably supported by a cylindrical bearing part 3 formed integrally with the bearing part 1. A pinch roller 4 is pressed against the outer peripheral surface of the capstan shaft 2. As shown in FIGS. 3 and 4, the cylindrical bearing portion 3 protrudes from the upper and lower surfaces of the substrate 1, and on the upper surface side protrusion, there is a cylindrical bearing portion 3 on the side opposite to the pinch roller pressure contact side (the right side in FIG. 4). ) is a continuous semi-cylindrical pressure receiving wall 7.

The capstan shaft 2 is inserted through the bearing portion 3,
A flywheel 8 is fixed to its lower end. Further, a retaining member 10 such as an E-ring is fitted into the annular groove 9 of the capstan shaft 2, and the retaining member 10 is brought into contact with the upper end surface of the pressure receiving wall 7, and the capstan shaft 2
is prevented from falling downward. The pinch roller 4 is rotatably attached to a pinch roller arm 11 rotatably supported on the upper surface of the substrate 1, and the rotating end of the pinch roller arm 11 is connected to the head panel 12 via a pinch roller spring 11a. connected. When the head panel 12 moves forward, the pinch roller arm 11 rotates in conjunction with this, and the pinch roller 4 is brought into pressure contact with the capstan shaft 2. The head panel 12 is made of a conductive metal plate, and is mounted on the upper surface of the substrate 1 so as to be able to reciprocate in the directions of arrows A and B in FIG.
direction). This head panel 12
A magnetic head 14 is attached to the upper surface of the head.

The torsion spring 13 for returning the head panel has an intermediate coil portion 13a fitted into a protrusion 15 provided on the upper surface of the board 1, one end 13b locked to the front edge of the head panel 12, and the other end 13c fixed to the front edge of the head panel 12. It is locked by a locking protrusion 16 of. A projection 2 is provided on the upper surface of the substrate 1 at a position near the cylindrical bearing portion 3.
0, and this protrusion 20 is provided with a torsion spring 21 for removing static electricity, which has an extremely small elastic force.
The intermediate coil portion 21a is fitted therein. One end 21b of this torsion spring 21 contacts the outer peripheral surface of the capstan shaft 2 from the side facing the hydraulic wall 7, and the other end is locked to the other end of the torsion spring 13 for returning the head panel. Therefore, the capstan shaft 2 and the head panel 12 are
Electrical continuity is established through the static electricity removal torsion spring 21 and the head panel return torsion spring 13.

In FIGS. 1 and 2, reference numeral 22 is a reproduction lever integrally formed with the head panel 12, and 23 and 24 are a fast-forward lever and a stop lever, respectively. Further, reference numeral 25 indicates a detection lever 26 for detecting the end of the tape, a take-up reel shaft, 27 a supply reel support shaft, 28 a pulley coaxially connected to the take-up reel shaft 26, and 29 a tape drive motor. be. The rotation of the motor 29 is transmitted to the flywheel 8 and the capstan shaft 2 via a motor pulley 30 and an endless belt 31 shown in FIG. Further, the rotation of the flywheel 8 is transmitted to the pulley 28 and the take-up reel shaft 26 via an endless belt 32 shown in FIG.

Further, in FIG. 2, reference numeral 33 indicates the regeneration lever 2.
This is a locking lever that holds the fast-forwarding lever 2 or 23 in the pushed-in position, and the holding of the lever 22 or 23 by the locking lever 33 is released by pushing the stop lever 24. Furthermore, in FIG. 2, reference numeral 34 is an autolever that is interlocked with the detection lever 25, and when the detection lever 25 rotates at the end of the tape, the pulley 2
8 and moves the locking lever 33 under the rotational force of the pulley 28.
This is to release the hold on the lever 22 or 23 by the lever 22 or 23.

In the above configuration, the regeneration lever 35 is
When pushed in the direction, the head panel 12 moves forward,
As the magnetic head 14 comes into contact with the tape 41,
The pinch roller arm 11 rotates, the pinch roller 4 comes into pressure contact with the capstan shaft 2, and the regeneration lever 3
5 is held in the pushed-in position by a locking lever 28. Then, the motor 33 rotates, the capstan shaft 2 and the take-up reel shaft 25 rotate, and the tape 4
1 runs and a regeneration operation is performed.

Further, when the fast-forwarding lever 36 is pushed in, the head panel 12 does not move, so the pinch roller does not come into contact with the capstan shaft 2, the take-up reel shaft 25 rotates at high speed, and the tape 41 is wound at high speed.
At this time, the fast-forwarding lever is held at the push-in position by the locking lever.

When the stop lever 37 is pushed in in the playback or fast-forward operation state, the locking lever 33 releases the playback lever 22 or the fast-forward lever 23, resulting in the stop state.

(Effects of the invention) According to the invention, since the torsion spring for removing static electricity that is in direct contact with the capstan shaft has a small elastic force, the increase in load on the capstan shaft is extremely small, and uneven rotation is reduced. Does not occur. Further, since the spring contact portion of the capstan shaft cannot be heated to a very high temperature, it is possible to prevent noise from occurring due to lack of oil. Furthermore, since the wear of the spring contact area is not accelerated, the lifespan of the capstan shaft is not shortened, and the tape recorder has many advantages while simplifying its configuration by eliminating oil-less metal. A static electricity eliminator can be provided.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a plan view showing the mechanical part of the tape recorder, Fig. 2 is an exploded perspective view of the same, Fig. 3 is a vertical sectional view of the vicinity of the capstan shaft, and Fig. 3 is a longitudinal sectional view of the vicinity of the capstan shaft. FIG. 4 is a perspective view showing the periphery of the cylindrical bearing part. DESCRIPTION OF SYMBOLS 1... Board, 2... Capstan shaft, 3... Cylindrical bearing portion, 13... Torsion spring for returning the head panel, 21... Torsion spring for removing static electricity.

Claims (1)

[Scope of utility model registration request] A reciprocally movable head panel made of a metal plate and a torsion spring for returning the head panel that urges the head panel in the return direction at one end are mounted on a synthetic resin substrate, and a cylindrical bearing portion that supports the capstan shaft is mounted on the synthetic resin substrate. In a tape recorder formed integrally with a substrate, a protrusion is provided on the substrate at a position near the cylindrical bearing portion, and the protrusion is provided with an intermediate portion of a torsion spring for removing static electricity, which has a smaller elastic force than the torsion spring for returning the head panel. The coil portion is fitted, one end of the torsion spring for removing static electricity is brought into sliding contact with the outer periphery of the capstan shaft, and the other end is locked to the other end of the torsion spring for returning the head panel. Static electricity eliminator for tape recorders.