JPS5924461A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To transmit rotating power and specify rotation securely through simple constitution without providing a brake separately. CONSTITUTION:A rim driving part consists of a rim 28, a spring bearing 29, and a compression spring 30. The rim 28 and the spring bearing 30 are pressed to upper and lower specifying parts 22 and 27 by the spring 30. The rim 28 and the spring bearing 29 rotate a reel 20 in a reproduction mode against the friction to the upper and lower specifying parts 22 and 27 which are pressed. The rim driving part does not rotate against the friction force of sliding surfaces 28a and 29a provided to the rim 28 and the spring bearing 29, and stops immediately in a stop mode. An engagement part 28b and an engagement piece 29b abut on each other by the spring force when the upper specifying part 22 is detached, so the rim 19, the spring bearing 29, and the spring 30 form one body; the rim driving part is handled as a single article.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic recording/reproducing device, and an object of the present invention is to reliably transmit rotating power and regulate rotation with a simple configuration.

First, a conventional magnetic recording/reproducing apparatus in which a take-up reel is driven by a rim will be described with reference to FIG.

FIG. 1 is a block diagram of a conventional magnetic recording and reproducing apparatus.

In the figure, 3 is a magnetic tape pulled out from a video cassette 2, 1 is a supply reel, 20 is a take-up reel, 4 is a tension post that is rotatably supported on the chassis, and 5 is a fixed piece installed in the chassis. The P1 post is rotatably supported on a shaft (not shown), 6 is a full-width erase head, 7.11 is a height regulating post for pulling out the magnetic tape 3 from the cassette 2, and 8 and 10 are height regulating posts. This is an inclined post installed opposite the regulation post.

12 is an interference roller rotatably supported on the chassis, 13U audio race head, 14 is an audio
Tio control head, 1sif: P4 post, 9
is a cylinder equipped with a rotating head (not shown), 17
18 is a 7"2:PF5 post which is rotatably supported by the shank.

Reference numeral 19 denotes a rim and a driving section that drive the take-up reel 20.

Next, the operation of this device will be explained.

When switching this device to magnetic tape loading mode,
The magnetic tape 3 passes from the cassette 2 to the entry side height regulating post 7,
It is pulled out in the direction of arrow C by the entry-side inclined post 8, the exit-side height regulating post 11, and the exit-side inclined post 10, and is wound around the cylinder 9 as shown in FIG.

In this state, the magnetic tape 3 is already ten/combost 4,
It is wrapped around the P1 post 6, the full erase head 6, the impedance roller 12, the audio erase head 14, the P4 post 16, and the P5 post 18 at predetermined angles.

Next, when switching to the magnetic tape running mode, the pinch roller 17 is pressed by the rotating capstan shaft 16 and causes the magnetic tape 3 to run.

At this time, the take-up reel 20 is rotationally driven by the rim drive section 19 in order to wind up the tape 3 sent out by the rotation of the capstan shaft 16.

As described above, in the conventional magnetic recording and reproducing apparatus, it is necessary to pull out and wind the magnetic tape 3 when switching modes. At this time, the supply 1N+11)-reel or the take-up reel 20 needs to wind up or send out the tape 3. To prevent unnecessary slack from occurring in the magnetic tape 3 when switching modes, it is necessary to restrict the rotation of the take-up reel and apply tension to the tape 3 when the reel is stopped. A braking mechanism is required to regulate the

Hereinafter, an example of a braking mechanism in a conventional magnetic recording/reproducing device will be explained in detail with reference to FIGS. 2 and 3.

Figure 2 is a perspective view of the rim drive section of the conventional device, and Figure 3 is
FIG. 3 is a side view of the turning section viewed from the X direction. In the figure, reference numeral 21 denotes a fixed shaft implanted in the / yarn 31, which is a rotational support shaft of the rim drive section, and reference numeral 19 denotes a fixed shaft.・The rim that rotates and transmits power, 19aid, the sliding surface of the rim 19, 22 is the rim 19
27 is provided on the / yarn and holds the rim 19 together with the upper restriction portion 22; 23 is a brake support shaft implanted in the shear 7; 24 is also provided on the yarn / The implanted spring hook bin 26 is a brake and is rotatably supported around the brake support shaft 23.

A brake spring 25 holds the brake 26 against the sliding surface 19a, and is a torsion coil spring with one end fixed to the spring hook pin 24 and the other end fixed to the brake 26.

Reference numeral 20 denotes a take-up reel, which receives power from a rim drive section and rotates.

Next, the operation of this device will be explained. When the apparatus is in the playback mode, the rotating rim 19 overcomes the frictional force of the brake 26 in pressure contact to rotate the reel 2o, and winds the magnetic tape 3 onto the reel 2o.

Next, when the stop mode is set, the motor that drives the rim 19 (
(not shown) stops, the rim 19 is unable to overcome the frictional force between the brake 26 and the sliding surface provided at the lower end of the rim 19 and continue rotating, and immediately stops. However, such a device requires a separate brake, making it difficult to miniaturize the device.

The present invention eliminates these drawbacks and is compact,
A lightweight magnetic recording/reproducing device is provided.

An embodiment of the present invention will be described below with reference to FIGS. 4 and 5.

FIG. 4 is a perspective view of a rim driving section of a magnetic recording/reproducing apparatus according to an embodiment of the present invention, and FIG. 6 is an explanation of the operation of the rotating section.

In the figure, reference numeral 21 denotes a fixed shaft installed in the sharn, which serves as a rotational support shaft for the rim drive unit, 28 is a rim that transmits power to the reel 20, 29 is a spring receiver that rotates together with the rim 28, and 30 is a compression coil spring stored in the spring receiver 29, which is disposed between the rim 28 and the spring receiver 290, and is arranged between the rim 28 and the spring receiver 290.
8 and the spring receiver 29 in the direction of separating them. Reference numeral 22 denotes an upper regulating portion that determines the position of the rim 28 pushed up by the compression coil spring 30 and determines the force of the spring 30 that biases the rim 28 and the spring receiver 29 in a direction to separate them.

Reference numeral 27 denotes a lower regulating portion that holds the rim 28 together with the upper regulating portion 22 .

Next, the operation of this device will be explained.

are pressed against the upper and lower regulating portions 22 and 27, respectively.

When the device is in the playback mode, the rim 28 and the spring receiver 29, which are rotated by a motor (not shown), are in pressure contact with each other and rotate the reel 20 by overcoming the friction with the lower regulating portion 22,27. Wind up the magnetic tape 3.

Next, when the stop mode is set, the motor (not shown) that drives the rim drive part stops, so the rim drive part moves between the upper and lower regulating parts 22, 2, the rim 28, and the sliding slide provided on the spring receiver 29. It is unable to continue rotating by overcoming the frictional force with the surfaces 28a and 29a, and immediately stops.

In this way, in this embodiment, the same operation as the conventional one can be realized using three types of parts, making it possible to reduce the size and weight of the device.

Furthermore, in this embodiment, the retaining portion 28b provided on the rim 28 and the engaging piece 29b provided on the spring receiver 29 shown in FIG. 5 come into contact with each other due to spring force when the upper regulating portion 22 is removed. 19, the spring receiver 29 and the spring 30 are integrated. In this way, the rim drive section can be handled as a single item, making it possible to reduce the number of man-hours required to assemble the device and improve workability.

In addition, in this example, an example in which the rim for transmitting rotational force to the reel has a cylindrical shape is shown, but the rim is not limited to this, and if the take-up reel is gear-shaped, it may be meshed with the reel. A gear-shaped rim may also be used. In this case, the head teeper that was necessary for the rim 28 of the previous embodiment becomes unnecessary, and moreover, a large rotational force can be reliably transmitted to the reel.

As described above, according to the present invention, rotational force can be reliably transmitted to the cassette with a simple configuration, and a braking function can be added without increasing the number of parts, making it possible to downsize the device. can.

[Brief explanation of the drawing]

Fig. 1 is a schematic configuration diagram of a conventional magnetic recording/reproducing device, Fig. 2 is a perspective view of the rim drive section of the same device, Fig. 3 is a side view of the rotating section, and Fig. 4 is an embodiment of the present invention. FIG. 6, which is a perspective view of a certain magnetic recording/reproducing device, is a sectional view taken along the line AA' in FIG. 4. 1...Supply side reel, 2...Cassette, 3...Magnetic tape, 4...Ten-stop, 6...Pinch roller , 6...
・Full-width erasing head, 7... Entrance height regulation post, 8... Entrance inclined post, 9... Cylinder, 1o... Exit inclined Post, 11... River/exit height regulation post, 12... Impedance lower, 13... Audio erase head,
14...Oti Off/Troll Head, 15
...P4 post, 16 ... Capstan, 17 ... Pinch roller, 18 ... P6
Post, 19...Rim, 20...Take-up reel, 21...Fixed shaft, 22...Upper regulating portion, 23... Brake support shaft, 24...
... Spring hook bin, 25 ... Brake-spring, 26 ... Brake, 27 River ... Lower regulating part, 28 ... Rim, 29 ...・Spring holder, 3o...compression coil spring. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3 Figure 2/7 Figure 4 7 Figure 5 1

Claims (1)

[Claims] a mounting means for storing a reel wound with magnetic tape and for mounting a cassette in a predetermined position; a rim rotatably supported by a support shaft embedded in a substrate and driving the reel; and a rim for driving the reel; A magnetic recording/reproducing device comprising: a compression spring for press-contacting a locking portion provided on an upper part of a shaft.