JPS6141155Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a cassette half holding mechanism in a cassette tape recorder, and in particular, is capable of reliably holding the cassette half vertically and in the front-rear direction, as well as facilitating the installation and removal of the cassette half. This relates to a cassette half holding mechanism.

Conventionally, there are two main methods for holding the cassette half, one of which is the so-called kangaru pocket method, but when the cassette is attached or removed, the kangaru pocket rotates about a certain point as a fulcrum. If a design with a small margin is used to ensure reliable holding, there is a drawback that stable operation is difficult to obtain.

Therefore, another method to solve this problem is the direct holding method, and various methods have been used, but most of them involve attaching a cassette half,
Due to restrictions when removing the cassette half, the location where the force to hold the cassette half is transmitted is limited to the edge of the cassette half, and the pins for positioning in the height direction are located closer to the center of the cassette half than the location where the force is transmitted. Therefore, a couple is generated in the direction of lifting the front end (opening side) of the cassette half. Therefore, in order to ensure stable running, it is necessary to apply a pressing force to this front end by other means, which has the disadvantage of increasing the number of parts. An example of a holding mechanism using this method is shown in FIG.

To explain with reference to the drawings, 1 is a cassette half, 2 is a base, 3 and 4 are press members rotatably supported, and 5 and 6 are springs that heat each press member toward the cassette half 1. It is. The pressing force is transmitted to the cassette half 1 through the contact point with the pressing member 3, but since that contact point is located outside the cassette half height direction positioning pin 7, it is necessary to firmly hold the cassette half. If the pressing force of the spring 5 is increased, the front end of the cassette half 1 will lift up, and in order to prevent this, the front end of the cassette half must be held by the pressing member 4, which increases the number of parts. The structure also became more complex.

According to the present invention, with an extremely simple structure,
The object of the present invention is to provide a device that can more securely hold a cassette half.

The configuration of the present invention will be explained below with reference to FIGS. 2 and 3. In the figure, 10 is an L-shaped pressing member rotatably supported on the leg 11, 12 is a cassette half pressing spring attached to the pressing member 10, and 1
3 is a pressing member holding spring that presses against the back of the pressing member 10; 14 and 15 are longitudinal positioning pins; 16 is a lateral positioning pin; 17 is a capstan shaft; 18 is a pinch roller support arm;
19 and 20 are erasing and recording/reproducing heads, respectively;
21 is a reel shaft. The pressing member 10 has a first arm 10a which abuts against the lower side of the cassette half and is rotated, and a second arm 10b which abuts against the upper surface of the cassette half to suppress it.

Next, the operation of attaching and detaching the cassette leaf will be explained. FIG. 4 shows the state before the cassette half is installed. The cassette half 1 is parallel to the chassis base 2 or at a slight angle, and the reel shaft 2 is guided by the longitudinal positioning pins 14 and 15 and the capstan shaft 17.
When the cassette half 1 is attached, the front end of the cassette half 1 comes into contact with the longitudinal positioning pin 14, and the rear end comes into contact with the cassette half pressing spring 12, as shown in the figure. Next, when the cassette half is pushed, the lower surface of the cassette half resists the holding spring 13 of the pressing member 10, and the pressing member 10
Rotate. When the cassette half passes through the neutral point formed by the protruding portion of the cam provided on the pressing member 10, the direction of force transmission by the pressing member holding spring is reversed, and the cassette half descends as if being sucked in, and the cassette half meets the end face of the lateral positioning pin 16. , the mounting is completed by pressing the tip of the height direction positioning pin 7, and the state shown in FIG. 3 is obtained.

In the installed state, the cassette half 1 is pressed by the pressing member 10 against the end face of the lateral positioning pin 16 and the tip of the height positioning pin 7, which are force transmission points. Pressing member 10
The contact point between the arm 10b and the cassette half is the pin 16.
It is important that the positioning pin is closer to the center of the cassette half than either of the positioning pins. This makes the system stable and makes it possible to securely hold the cassette half. Moreover, the reaction force from the cassette half to the cassette half pressing spring 12 that presses the cassette half against the longitudinal positioning pin 14 generates a force couple that increases the pressing force that the pressing member 10 applies to the cassette half. and increases the stability of the system. It should be noted that according to the prior art, these simultaneous increases in the pressing forces tended to reduce the stability of the system.

Next, when removing the cassette half, the process is reversed. That is, if the cassette half 1 is pulled out against the force of the pressing member holding spring 13 transmitted through the pressing member 10, the direction of the force is reversed with respect to the neutral point of the cam 22, so that the cassette half is automatically pulled out. The fourth
Return to the state shown in the figure.

As a modification of the present invention, for example, the pressing member 10
and the cassette half pressing spring 12, or the pressing member holding spring 13, and the cassette half pressing spring 12.
Modifications can be made without departing from the concept of the present invention, such as integrating the spring 13 and the pressing member holding spring 11.

As is clear from the above, the present invention has a simple structure and is easy to operate because the cassette halves can be installed and removed by simply pushing in and pulling out the cassette halves.

[Brief explanation of the drawing]

Fig. 1 is a side view showing a conventional cassette half holding device, Fig. 2 is a plan view showing a cassette half holding device according to the present invention, and Fig. 3 is a sectional view taken along line A-A in Fig. 2 when the cassette half is installed. FIG. 4 is a diagram showing the state before the cassette half is attached. 1...Cassette half, 2...Base, 3, 4...
... Pressing member, 5, 6 ... Spring, 7 ... Positioning pin, 10 ... Pressing member, 10a, 10b ... Arm,
11...Leg, 12...Cassette half pressing spring,
13... Holding spring, 14, 15... Positioning pin, 17... Capstan shaft, 18... Pinch roller support arm, 19, 20... Recording/playback head, 21... Reel shaft.

Claims (1)

[Scope of utility model registration request] It has a height direction positioning member that holds the cassette half at a predetermined height on the base, a first arm that comes into contact with the side surface of the base of the cassette half, and a second arm that comes into contact with the back surface of the base, and is rotatable. a pressing member supported by the pressing member; a spring for holding the pressing member in pressure contact with the pressing member; and a cam portion formed on the pressing member so as to be in pressure contact with the spring and reversing the action of the pressing force during installation of the cassette half. , a cassette half holding mechanism comprising a spring attached to the pressing member to press the cassette half against the longitudinal positioning member when the cassette half is installed;