JPS6125078Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention particularly relates to a support structure for the idler wheel of a tape recorder in which an idler wheel provided on a head substrate is brought into pressure contact between a drive wheel and a reel stand as the head substrate advances.

In a structure in which the idler wheel is mounted on the head board as described above, if there are variations in the movement stroke of the head board, the pressure force of the idler wheel against the reel stand and the drive wheel may be excessive or insufficient.
Unable to measure smooth rotational transmission.

For this reason, the amount of movement of the head board is generally designed to be slightly overstroked so that the idler wheel comes into contact with the reel stand as well as the drive wheel with force. However, if this is done, there is a problem in that an excessive load is generated between the idler wheel, the drive wheel, and the reel stand.

Therefore, this idea involves forming an elastic arm integrally on the head board, and supporting the idler wheel on this arm to provide a buffering function, absorbing the excessive load generated between the three components, and ensuring smooth rotational transmission. It is something to be printed.

The details of the embodiment will be described below with reference to the drawings.

1 is a synthetic resin chassis, 2 is a winding side reel stand rotatably supported by the chassis, 3 is an unwinding side reel stand, and a wheel 4 is coaxially provided on the winding side reel stand 2. , and this wheel 4
A drive wheel 5 is arranged at a position separated from one side of the vehicle, and an idler wheel 6 faces between the drive wheel 5 and the wheel 4 so as to be movable towards and away from the drive wheel 5.

Therefore, in the present invention, an elastic arm 8 whose base end is integrally connected to the head substrate 7 is integrally formed, and the idler wheel 4 is attached to this arm.

The head board 7 is made of synthetic resin, and is supported by several guides 9 integrally formed on the chassis 1 (made of synthetic resin) so as to be movable back and forth. A recording/reproducing magnetic head 10, an erasing head 11, and a pinch roller 12 are provided, respectively.

The pinch roller 12 is supported by an arm 13, and a U-shaped engagement groove 14 is formed at the base end of the arm 13. This groove 14 is connected to a flanged pin 15 that is integrally implanted in the chassis 1. The arm 13 is engaged with the spring 16 from the side in a manner that prevents it from coming off.
It is urged to rotate forward about the pin 15 as a fulcrum. And the head board 7 is the play button lever 1
7 for forward movement. 18 is a return spring for the head board.

The erasing head 11 is made of synthetic resin with a built-in magnet, and this head 11 integrally includes a leg portion 11a, a sliding piece portion 11b, and a receiving flange portion 11c, and the sliding piece portion 11b is connected to the head substrate. A narrow slot 7b is formed at the bottom of the sliding groove 7a in the front-rear direction, and the leg portion 11a and the receiving part are connected to each other through the slot 7b. The flange portion 11c is made to protrude downward, and the head board 7 is fitted from above and below between the receiving flange portion 11c and the sliding piece portion 11b in a manner to prevent it from coming off, and the protruding lower end of the leg portion 11a is fixed to the recording button lever 19. It is.

Therefore, when you press the record button lever 19, the erase head 1
1 moves forward, and at this time the leg portion 11a hits the front end of the slot 7b as shown in FIG. 3, causing the head board 7 to move forward and enter the recording state.

As shown in the figure, the slot 7b has a convex shape in plan view, and the receiving flange 1 extends from the wide part of the convex shape.
1c is inserted. 20 is a capstan shaft.

Therefore, when the head board 7 moves forward by the forward operation of the play button lever 17, the idler wheel 6 is moved forward together with the head board 7, and the idler wheel 6 is interposed between the drive wheel 5 and the wheel 4 and is in pressure contact with the head board 7. The pinch roller 12 is pressed against the capstan shaft 20, and tape scanning (play) is then performed.

Further, when the idler wheel 6 is pressed against the drive wheel 5 and the wheel 4, if an excessive load is generated there, the elastic arm 8 is forcibly bent in a direction to release the idler wheel 6, and the head board 7 is therefore prevented from moving forward. Rotational coupling can be achieved reliably regardless of the amount. In particular, when the idler wheel 6 is a gear and the drive wheel 5 and wheel 4 are gears, even the bumps between the ridges can be absorbed by the elastic arms.

As described above, according to the present invention, in a tape recorder in which an idler wheel provided on a head board is brought into pressure contact between a drive wheel and a reel stand as the head board advances, the idler wheel is attached to an elastic arm integrally formed on the head board. Therefore, when the idler wheel comes into contact with the drive wheel and the reel stand, if an excessive load is generated there, the elastic arm is deflected in the direction of letting the idler wheel escape, so that the idler wheel is always supported without strain. It is possible to make contact with the appropriate pressure and smoothly transmit the rotation from the drive wheel to the reel stand.
This type of idler mechanism has excellent practical effects.

[Brief explanation of the drawing]

FIG. 1 is a plan view, FIG. 2 is a longitudinal sectional front view of a part of the upper part, and FIG. 3 is a sectional view of the upper side. 2, 4... Reel stand, 5... Drive wheel, 6... Idler wheel, 7... Head board, 10... Magnetic head, 12... Pinch roller.

Claims (1)

[Scope of utility model registration request] In a tape recorder of a type in which a head board equipped with a magnetic head and a pinch roller is pressed into contact with an idler wheel interposed between a drive wheel and a reel stand as the head board moves forward, the idler wheel is integrally formed with the head board. An idler mechanism in a tape recorder characterized by being supported by an elastic arm.