JPS6213240Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a brake plate mounting mechanism in a cassette tape recorder.

Generally, a cassette tape recorder has a reel hub that is engaged to prevent the tape from sagging within the cassette due to inertia of the reel hub within the cassette, particularly on the delivery side, even after fast forwarding or rewinding of the tape is stopped. A brake plate is provided to apply braking to the reel stand that is integrated with the reel shaft.

Conventionally, the brake plate was attached to the frame board by rotatably supporting it on a bearing attached to the frame board and using a stopper to prevent this pivot from coming off, which required a lot of installation work and was costly. Not only is it expensive, but space must also be secured for the stopper, which poses a constraint in reducing the size of the tape recorder.

This invention was made in view of the above points,
The purpose of this is to eliminate the need for a separate stop to prevent the brake plate from coming off the pivot, thereby reducing installation man-hours and associated costs, and to create a cassette tape recorder that is effective in downsizing the tape recorder. An object of the present invention is to provide a brake plate mounting mechanism for a brake plate.

An embodiment of the present invention shown in the drawings will be described below.

In FIG. 1, reference numeral 1 denotes a frame board, which is integrally framed with a capstan motor board 3 via a side plate 2. As shown in FIG.

A pair of reel shafts 4, 4 are integrally provided with a reel stand 4a at the lower end, and are rotatably pivoted on a shaft (not shown) implanted in the frame substrate 1. When the pair of reel shafts 4, 4 are inserted into a kangaroo pocket-shaped cassette holder (not shown) with the tape side of the cassette half C (Fig. 2) facing downward, the pair of reel shafts in the cassette half C (Fig. The reel hubs are respectively engaged.

Reference numerals 5 and 5' designate a pair of brake plates provided on the frame board 1 corresponding to the reel shafts 4 and 4, respectively, and each brake plate includes a substantially dogleg-shaped flat plate portion 5a and this flat plate portion 5.
It consists of an upright part 5c that stands up from a and has a brake pad 5b made of rubber or the like attached to its tip, and is attached to the frame substrate 1 by insert molding by a pivot 5d that projects from the bent part of the flat plate part 5a. It is rotatably supported on a bearing 1'. One arm of the flat plate portion 5a of the brake plates 5, 5' is stacked on top of another, and the protruding shaft 5e provided on the brake plate 5 engages with the U groove 5f provided on the brake plate 5'. The brake plates 5, 5' are made to interlock with each other. Further, a spring 5g is stretched between the other arm of the flat plate portion 5a of the brake plates 5, 5', and the brake plates 5, 5' are applied with rotational force in opposite directions by this spring 5f. , these brake pads 5b are normally held in a state in which they are in elastic contact with the outer peripheral surfaces of the reel stands 4a, 4a, and apply braking force to the reel shafts 4, 4.
This braking force is released by moving the brake plates 5, 5' to the spring 5 by an operating rod (not shown) that operates in response to operations such as playing, recording, fast forwarding, rewinding, etc.
This is done by rotating against the urging force of g.

Reference numeral 6 denotes a main shaft, which includes a cassette tape attachment detection lever 7a, an erroneous erasure prevention lever 7b,
Chrome detection lever 7c and metal detection lever 7d
are each equipped with a rotatable skewer. Both ends 6a and 6b of this main shaft are fitted into holes 8a and 8b bored in both ends of the shift arm 8, respectively. In particular, one end portion 6b is a stepped shaft, and is adapted to be inserted while being prevented from moving in the axial direction. Further, annular grooves 6a' and 6b' are provided in the ends 6a and 6b of the main shaft 6, respectively, and dovetail-shaped bearing holes 1a and 6b formed in both ends of the base plate 1, respectively.
1b and slide the main shaft 6 in the direction of arrow A, as shown in FIG.
The shaft 6 and shift arm 8 are rotatably assembled into the base plate 1 with the E-ring 9 fitted in the shaft 6 and the shift arm 8 being brought into contact with the outer surface of the bearing hole 1b.

The shift arm 8 is used together with a lock arm (not shown), an eject lever 10, etc. to lock and eject a cassette holder (not shown).

As shown in FIG. 2, when the shaft 6 and shift arm 8 are assembled into the bearing holes 1a and 1b of the base plate 1, the shaft portion 7d' of the metal detection lever 7d touches the upper surface of the flat plate portion 5a of the brake plates 5, 5'. will be located adjacent to.

The capstan motor board 3 is provided with a cassette tape attachment detection switch 11a, an erroneous erasure prevention detection switch 11b, a chrome detection switch 11c, a metal detection switch 11d, etc., and each of the detection levers 7a, 7b, Each leaf spring 12a, 12b, 12c rotates together with 7c, 7d,
It is adapted to be elastically pushed by 12d.

The detection levers 7a, 7b, 7c, and 7d depend on whether or not there is a hole in the corresponding part of the tape side of the cassette half C and the opposite side when the cassette half C is installed as shown in Fig. 3. , its rotation position is determined, and switch 1 is determined by the presence or absence of the hole.
1a, 11b, 11c, and 11d are turned on and off, thereby detecting the type of cassette tape, detecting the prevention of erroneous erasure, and detecting the attachment of the cassette tape.

In the illustrated embodiment, brake plates 5, 5' rotatably supported on the frame board 1 are provided so as to be sandwiched between the shaft portion 7d' of the detection lever 7d and the frame board 1. Although the support is designed to prevent the support from coming off, if the shaft portion 7d' is eliminated and the diameter of the portion of the main shaft 6 corresponding to the shaft portion 7d' is increased instead, the brake plates 5, 5 can be moved in the same way as described above. ' can be prevented from floating off the board 1 and coming off its pivot.

As described above, the present invention provides a brake plate that is rotatably supported on a frame substrate, and is interposed between the frame substrate and a shaft equipped with various detection levers supported on the frame substrate, or a shaft portion of the lever. Since the brake plate is prevented from floating from the frame substrate in this manner, the brake plate is prevented from coming off its pivot and falling off from the frame substrate.

Therefore, there is no longer a separate means such as a stopper that was required in the past to prevent the brake plate from lifting off from the frame board, and this makes it possible to reduce costs by reducing the number of parts and man-hours, as well as downsizing by effectively utilizing space. Many extremely excellent effects can be obtained.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view showing a brake plate mounting mechanism according to the present invention, FIG. 2 is a top view, and FIG. 3 is a partial side view. 1... Frame board, 5, 5'... Brake plate, 6... Main shaft, 7a, 7b, 7c,
7d...detection lever, 7d'...shaft part.

Claims (1)

[Scope of utility model registration request] Cassette tape type detection, accidental erasure prevention detection,
A brake plate is rotatably mounted on a frame board supporting a shaft having a detection lever for detecting the attachment of a cassette tape, etc., so as to be interposed between the board and the shaft or the shaft portion of the lever. A mounting mechanism for a brake plate in a cassette tape recorder, characterized in that the brake plate is pivotally supported to prevent the brake plate from floating.