JPH0419620B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rim drive device used in a magnetic recording/reproducing device, etc., 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/reproducing apparatus.

In the figure, 3 is a magnetic tape pulled out from a video cassette 2, 1 is a supply reel wrapped with magnetic tape, 20 is a take-up reel, 4 is a tension post rotatably supported by a chassis, and 5 is a reel on the winding side. P1 post is rotatably supported on a support shaft (not shown) installed in the chassis; 6 is a full-width erasing head; 7;
11 is a height regulating post for drawing out the magnetic tape 3 from the cassette 2, and 8 and 10 are inclined posts installed opposite to the height regulating post.

12 is an impedance roller rotatably supported by the chassis; 13 is an audio race head; 14 is an audio control head; 15
1 is a P4 post, 9 is a cylinder equipped with a rotary head (not shown), 17 is a pinch roller that can press against and separate from the capstan 16 in order to run or stop the magnetic tape 3, and 18 is rotatably supported by a chassis. This is a P5 post.

19 is a rim drive unit that drives the take-up reel 20.

Next, the operation of this device will be explained.

When this device is switched to the magnetic tape loading mode, the magnetic tape 3 is moved from the cassette 2 through the entrance height regulating post 7, the entrance inclined post 8, the exit height regulating post 11, and the exit inclined post 10. It is pulled out as shown in C, and the first
Wrap it around as shown.

In this state, the magnetic tape 3 has already been attached to the tension post 4, P1 post 5, full erase head 6,
Impedance roller 12, audio oil race head 14, P4 post 15 and P5 post 18
They are each wrapped at a predetermined angle.

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 connected to the capstan shaft 1.
In order to wind up the tape 3 sent out by the rotation of the rim drive section 19, the tape 3 is rotated by the rim drive section 19.

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 reel or the take-up reel 20 needs to wind up or send out the tape 3. During this mode switching, unnecessary slack occurs in the magnetic tape 3. To prevent this, it is necessary to restrict the rotation of the take-up reel and apply tension to the tape 3 when it is stopped.
A braking mechanism is required to restrict rotation of the reel.

The braking mechanism of the rim drive unit in a conventional magnetic recording/reproducing device will be specifically explained below with reference to FIGS. 2 and 3.

FIG. 2 is a perspective view of the rim drive section of the conventional device, and FIG. 3 is a side view of the same section as viewed from the X direction. In the figure, reference numeral 21 denotes a support shaft installed in the chassis 31, which is a rotational support shaft of the rim drive unit, 19 a rim that rotates around the support shaft 21 and transmits power, and 19a a support shaft for the rim 19.
22 is an upper regulating part that prevents the rim 19 from coming off; 27 is a lower regulating part that is provided on the chassis and holds the rim 19 together with the upper regulating part 22; 23;
24 is a spring hook pin installed in the chassis; and 26 is a brake, which is rotatably supported around the brake support shaft 23.

A brake spring 25 presses 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 rotates by receiving power from the rim drive section.

Next, the operation of this device will be explained. When the apparatus is in the magnetic tape running mode, the rotating rim 19 overcomes the frictional force of the brake 26 and rotates the reel 20, thereby winding the magnetic tape 3 onto the reel 20.

Next, when the stop mode is set, the motor (not shown) that drives the rim 19 stops, so the rim 19 continues to rotate by overcoming the frictional force between the brake 26 and the sliding surface provided at the lower end of the rim 19. It will no longer be possible to do so and will stop immediately.

However, such a device has the disadvantage that a brake must be provided separately, making it difficult to miniaturize the device.

The present invention eliminates these drawbacks and provides a small and lightweight rim drive device.

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 which is an embodiment of the present invention, and FIG. 5 is an explanation of the operation of the same section.

In the figure, reference numeral 21 denotes a support shaft installed in the chassis, which serves as a rotation support shaft of the rim drive section.

28 is a rim that transmits power to the reel 20, 29
30 is a compression spring stored in the spring receiver 29, which is disposed between the rim 28 and the spring receiver 29, and is biased in the direction of separating the rim 28 and the spring receiver 29. It is a compression spring for Reference numeral 22 designates an upper regulating portion that determines the position of the rim 28 pushed up by the compression spring 30 and determines the force of the compression spring 30 that biases the rim 28 and the spring receiver 29 in the direction of separating them. 2
Reference numeral 7 denotes a lower regulating part that holds the rim 28 together with the upper regulating part 22.

Next, the operation of this device will be explained.

The rim drive section is composed of a rim 28, a spring receiver 29, and a compression spring 30.
7 are pressed respectively.

When the device is in the play mode, the rim 28 and the spring receiver 29 rotated by a motor (not shown) are in pressure contact with each other, and the reel 20 is rotated by overcoming the friction with the lower regulating parts 22 and 27. The magnetic tape 3 is wound onto the reel 20.

Next, when the stop mode is set, the motor (not shown) that drives the rim drive part stops, so the rim drive part is moved between the upper and lower regulating parts 22, 27, the rim 28, and the sliding surfaces provided on the spring receiver 29. It is no longer possible to continue rotating by overcoming the frictional force with 28a and 29a, and it immediately stops.

In this way, in this embodiment, the same operation as the conventional one is performed in three ways.
This can be realized using a variety of parts, making it possible to make the device smaller and lighter.

Furthermore, in this embodiment, the engaging portion 28b provided on the rim 28 and the engaging piece 2 provided on the spring receiver 29 shown in FIG.
Since the rims 9b abut against each other due to spring force when the upper regulating portion 22 is removed, the rim 28, the spring receiver 29, and the compression 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 this embodiment, an example is shown in which the rim for transmitting rotational force to the reel has a circular shape, but the rim is not limited to this, and if the take-up reel is gear-shaped, the reel may have a circular shape. Intermeshing gear-shaped rims may also be used. In this case, 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 drawings]

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, and Fig. 3 is a schematic diagram of a conventional magnetic recording/reproducing device.
The figure is a side view of the same part, FIG. 4 is a perspective view of a rim drive unit of a magnetic recording and reproducing device according to an embodiment of the present invention, and FIG. 5 is a sectional view of the section A-A' in FIG. 4. . 1... Supply side reel, 2... Cassette, 3...
Magnetic tape, 4... Tension post, 5... Pinch roller, 6... Full width erase head, 7... Entrance side height regulation post, 8... Entrance side inclined post, 9...
Cylinder, 10... Exit inclined post, 11...
Exit height regulation post, 12... Impedance roller, 13... Audio oil race head, 14
...Audio control head, 15...
P4 post, 16...capstan, 17...pinch roller, 18...P5 post, 19...rim,
20... Winding side reel, 21... Support shaft, 22...
Upper regulation part, 23...Brake support shaft, 24...Spring hook pin, 25...Brake spring,
26...brake, 27...lower regulation section, 28...
...Rim, 29...Spring holder, 30...Compression spring.

Claims (1)

[Claims] 1. A rim that is rotatably supported on a spindle embedded in a substrate and that drives the reel by coming into contact with a reel wound with magnetic tape, and a regulation provided on the top of the spindle that connects the rim. A rim drive device comprising: a compression spring for press-contacting the rim; and a spring receiving part for integrating the rim and the compression spring.