JPS6234350A - Brake for tape recorder - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a braking device for a tape recorder, in particular a cassette tape recorder, which comprises a winding disc rotatably supported on a shaft. The shaft extends over the entire length of the shaft and has a concentrically arranged chimney-like extension, on which a driving body is arranged so as to be movable in the axial direction. The coil is of the type which is pressed against the outer end of the extension by means of a spring.

BACKGROUND OF THE INVENTION Such braking devices are used during unwinding of an audio tape in order to exert a relatively small and as homogeneous braking moment as possible on the reel holding the tape to be rewound.

It is known to place tensioned wires in tape recorders. This wire comes into contact with the winding disk in the direction of a relatively large outer periphery tangential line and brakes the winding disk. However, such an arrangement is not easy to install in terms of space, since the wire must be long in order to achieve a flat spring characteristic curve. Furthermore, it is known to generate a braking moment using an axial compression spring, in which the pressure is exerted on the safety element of the winding disc. However, this method has the disadvantage of high wear and tear on the parts of the device.

Furthermore, it is known to provide a plastic spring tab that presses against the shaft. However, such a configuration is highly temperature dependent. Moreover, long-term spring losses occur.

Problem to be Solved by the Invention The object of the invention is to create a braking device for a tape recorder which requires little space and which does not undergo significant changes over time.

Means for Solving the Problem The means of the invention for solving the above nM is that a brake lever is provided, which brake lever pivots with its end towards an axis in the plane of rotation of the winding disc. The winding disk can be supported by a trap and has a protrusion, the protrusion being able to move in a notch formed in the chimney-like extension at a predetermined distance from said plane of rotation containing the bearing. It rests on the smooth surface of the shaft at an axial distance of , and passes through it in such a way that it is pressed against the shaft by the spring K acting on the control lever 8.

Effects of the Invention According to the configuration of the present invention, the braking device is sufficiently insulated from the effects of temperature, requires very little space, does not generate harmful return forces, and is able to obtain the braking function. This is achieved by requiring only one additional part.

Embodiments According to the embodiment described in claim 2,
A particularly low-friction bearing of the brake lever on the winding disc is achieved.

The embodiment according to claim 3 provides an advantageous construction of the brake lever. According to a particularly advantageous embodiment of the patent claim 4, only one helical spring is used to generate the braking moment and to press the driving body against the outer end of the chimney-like extension. Is possible.

An advantageous embodiment of the ribs of the driver according to claim 5 provides for a play-free, force-coupling contact between the driver and the reel during unwinding of the recording tape, with the result that the bell sound reel is is braked without any play during shooting loads.

Embodiment A winding disk 2 made of plastic is rotatably supported on a shaft 1 made of steel and having a smooth surface, which is fixed to the chassis of a tape recorder. A chimney-like extension 3 surrounding the shaft 1 is integrally formed on the winding disc 2 and is concentrically arranged.
has a hexagonal outline. On the extension 3, a driver 4 with an inner shell corresponding to the hexagonal outer shell of the extension is arranged axially movably in a known manner and a coil spring 5 surrounding the chimney-like extension 3. The driver 4 is elastically pressed against a stopper (not shown) at the outer end of the extension 3. The winding disc 2 has a rectangular recess 6 on the upper surface on the side of the extension 3. whose radially outer inner edge 7 extends in the rotor plane of the winding disk 20 over a portion of the string of the winding disk 2 and whose radially inner inner edge 7
extends near the center of the axis.

A brake lever 8, which is supported with an edge-shaped end 9 on the inner edge 7, has a projection 10. The protrusion 10 is a cut in the chimney-like extension 3 such that it abuts the smooth surface of the shaft 1 at a predetermined axial distance from the plane of rotation containing the brake lever bearing. It passes through the notch 11. Two fork-shaped arms 12 are integrally formed in the central part of the brake lever 8, which has an inclined part. surrounding the sides.

The two arms 12 serve as spring supports for the coil spring 5, so that the coil spring 5 elastically presses the brake lever 8 and its projection 10, which is configured as a brake slide, against the shaft 1; This generates a braking moment.

When winding a recording tape, the control device is driven via a winding disc 2 that meshes with a drive wheel. On the other hand, during rewinding, the winding disc 2 does not mesh with the drive wheel. The winding disc 2 is braked so that the recording tape passes the recording head of the tape recorder with constant speed and optimum tape tension.

As can be seen from FIG. 6, the driver 4 has three lips 13, and when the recording tape 14 is rewound in the direction indicated by the arrow R, the lips 13 are disposed on the basis of the braked winding disc 2. Contact is made with the reel 15 of the recording tape 14 without any play. As a result, the recording tape 14 and also the winding disc 2 are braked uniformly and without play even under strong vibration loads (which can occur in particular in automatic cassette tape recorders).

[Brief explanation of the drawing]

FIG. 1 is a perspective view of one embodiment of the braking device according to the present invention, FIG. 2 is a side view partially showing the braking device in section, and FIG.
The figure is a plan view of the driver in a state in which a winding disk and a magnetic tape reel 2 are connected. 1... shaft, 2... winding disc, 3...
・Extension part, 4... Drive body, 5... Coil spring, 6.
... recess, 7, 7'... inner edge, 8... brake lever,
9... End part, 10... Protrusion part, 11... Notch,
12...arm, 13...rep, 14...recording tape, 15...reel. 1 shaft 2 winding disc 3 extension part 5 spring 9 end 10 protruding part 11 notch 1 shaft 2 w/r winding disc

Claims (1)

[Claims] 1. A braking device for a tape recorder, comprising a winding disc rotatably supported on a shaft,
The winding disc extends over the entire length of the shaft and has a concentrically arranged chimney-like extension, on which a driving body is arranged movably in the axial direction, the driving body In the version which is pressed against the outer end of the extension by a coil spring, a brake lever (8) is provided, with which the rotation of the winding disc (2) is prevented. It is pivotably supported in a plane towards the axis (1) on a winding disc (2) and has a projection (10) which forms a chimney-like extension (3). The projection rests in a cutout (11) formed in the brake lever (8) on the smooth surface of the shaft (1) at a predetermined axial distance from the above-mentioned plane of rotation containing the bearing. ) Braking device for a tape recorder, characterized in that it extends through the shaft (1) in such a way that it is pressed against the shaft (1) by a spring (5) acting on the shaft (1). 2. A square recess (6) to support the brake lever (8).
) is formed on the winding disc (2),
The recess (6) has an inner edge (7) extending over a part of the string of the winding disc (2);
2. Braking device according to claim 1, characterized in that the knife-shaped end (9) of the brake lever (8) is supported on the brake lever (7). 3. The part of the brake lever (8) opposite to the protrusion (10) has a fork-like arm (12), and the arm (12) extends substantially parallel to the plane of rotation, and Patent claim, which laterally surrounds the chimney-like extension (3) and constitutes a spring receiver for a coil spring (5) used as a spring, which surrounds the extension (3). The braking device according to the range 1 or 2. 4. Between the fork-shaped arm (12) and the driving body (4), a coil spring (5) is commonly attached to the arm and the driving body.
) is disposed, the braking device according to claim 3. 5. Brake device according to one of the claims 1 to 4, characterized in that the driver (4) has three roof-like ribs (13).