JPS5924460A - magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To perform the rim driving of a take-up reel securely through simple constitution by arranging a rim for rotating the reel, a spring bearing which is arranged facing the rim and is turned together with the rim in one body, and a compression spring between the rim and the spring bearing. CONSTITUTION:The rim driving part consists of the rim 28, the spring bearing 29, and the compression spring 27, which is inserted and held between the rim 28 and the spring bearing 29. A cassette is loaded at a tape leading-out position and the take-up reel 20 of the cassette a buts on the head of the rim 28 as shown in a figure (b); if the rim 28 and the reel 20 do not engage each other properly, the rim 28 is pressed toward the spring bearing 29, but is to return to its original position (figure a) by the elastic force of the spring 27. When the rim 28 is rotated by a motor in said state, the reel 20 a butting on the head of the rim 28 meshes the rim 28 easily as shown in the figure (a) because the head of the reel 20 is tapered. In this case, the restitutive force by the spring 27 is so set that the cassette does not shift from the specified position.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic recording and reproducing device, and particularly to a magnetic recording and reproducing device using a cassette of a type in which reels are driven by the rim, and which reliably drives the reels by the rim with a simple configuration. aim at something.

First, the configuration of a conventional magnetic recording/reproducing apparatus that drives a take-up reel 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 the video cassette 2, 1 is a supply reel, 2o 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. A P1 post is rotatably supported on a shaft (not shown), 6 is a full-width erase head, 7 and 11 are height standards if; IJ posts for drawing out the magnetic tape-3 from the cassette 2, is height regulation boss) 7
．． This is an inclined post installed opposite to 11. 12 is an impedance roller rotatably supported by the chassis, 13 is an audio erase head, 14 is an audio control head), 161 dP 4 bosses, 9 is a rotary head (not shown) attached / Linder 117 is a magnetic head Pinch 18 is a P5 boss rotatably supported by the chassis, which can be pressed against and separated from the capstan 16 in order to run or stop the tape 3.

19 is a rim drive unit that drives 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 as shown by the arrow C by the entry side inclined post 8, the exit side height regulating post 11, and the exit side inclined post 1o, and is wound around the cylinder 9 as shown in FIG.

In this state, the magnetic tape 3 is already attached to the tension post 4.
P1 post 5. Full erase head 6° impedance roller 12. 14. P4 Bost 15. They are each wrapped around the P5 post 18 at a predetermined angle.

Next, when switching to the magnetic tape running mode, the vinyl yf roller 17u is pressed by the rotating capstan shaft 16, causing the magnetic tape 3 to run.

At this time, the take-up reel 2o is rotationally driven by the rim drive unit 19 in order to take up the tape 3 sent out by the rotation of the capstan shaft 16.

As described above, in a magnetic recording device using a cassette of the type in which the take-up reel 2o is renovated and driven, the take-up reel 20 and the rim drive section 19 are connected to each other after the cassette is installed and before the tape 3 is run. It needs to be in the correct position.

Next, the rim and drive section of the conventional device will be explained in detail.

Fig. 2 shows a rim drive unit with a simple configuration provided in a conventional magnetic recording/reproducing device, and Fig. 2a is a perspective view of the rim drive unit, and Fig. 2A is a perspective view of the rim drive unit, as viewed from the X direction in Fig. 2A. FIG.

In the figure, 24 is a chassis, 21 is a rim drive shaft installed in the chassis 24, 19 is a rim that rotates around the rim drive shaft 21 and drives the rim, and 20 is a cassette 2.
23 is a take-up side reel which is housed in the rim 19 and transmits the force to the rim 19; 23 is a winding reel which is a seat when the rim 19 rotates;
Reference numeral 2 designates an upper restricting portion provided to prevent the rim 19 from coming off the rim drive support shaft 21.

Next, the operation when loading the cassette will be explained using Figure 2.

The cassette 2 descends from the Y direction and guides the take-up reel 2° to the predetermined position indicated by the dotted line.
For other reasons, the end surface of the take-up reel 2o is displaced as shown by the solid line and stopped at the upper surface of the rim 19, as shown by the dotted line. There was a drawback that it could not be guided to a predetermined position.

There are also conventional examples that have solved these drawbacks.

FIG. 3 shows an example of this, in which FIG. 3a is a perspective view of a conventional rim drive section, and FIGS. 3a and 3c are side views taken from the X direction of FIG. 3a.

Reference numeral 21 denotes a rotation shaft installed in a boss 24 provided on the chassis; 19 a rim that rotates around the rotation support shaft 21 to drive the rim; and 20 a take-up reel to which power is transmitted by the rim 19. It is.

23 is a polyway wheel which serves as a seat when the rim 19 rotates;
Reference numeral 2 designates an upper restricting portion that prevents the rim 19 from coming off the rotational support shaft 21 .

27 is a compression coil spring placed in contact with the rotation of the boss 24, 25 is a spring receiver that receives the force of the compression coil spring 27, and 26 is a stopper that regulates the height of the spring receiver 26.

Next, the operation of the conventional rim and drive section will be explained with reference to FIG. 3c.

The rim 19 rotates around the rotating support shaft 21 and transmits power to the take-up reel 20, but the above-mentioned problem is caused by the compression coil spring 27 and the spring receiver 25. This is achieved by the stopper 26, that is, when the take-up reel 2o is guided to a predetermined position f1'r as shown in FIG.
If the engagement is not done correctly, the rim 19
is pushed down by the end face of the take-up reel 2o.

Next, when the take-up reel 2o is guided to a predetermined position, the rim 19 is rotated by a motor (not shown) and the restoring force of the compression coil spring 27 moves the IJ-reel 2Q to the predetermined position. It is pushed up and becomes the state shown in Figure 3.

The force of the compression coil spring 27 is restricted by the stopper 26, and the stopper 26 serves both to restrict the position of the spring receiver 25 in the height direction and as a rotation stopper.

This stopper 26 determines the normal operating length of the compression coil spring 27, which holds the rim 19 in place and prevents the force of the compression coil spring 27 from contributing to the rotation of the rim 19.

In this way, conventionally, when the cassette is installed, the take-up reel 2
In order to correctly guide rim 19 and rim 19 to the specified position,
9 is moved up and down in the direction of the rotational shaft. However, the rim 1 drive section inevitably requires a stopper, which increases the size of the device and increases the number of assembly steps.

The present invention eliminates these drawbacks, and aims to provide a magnetic recording and reproducing device that can correctly guide the take-up reel and the rim drive unit to a predetermined position with a simple configuration.

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 driving section of a magnetic recording/reproducing apparatus according to an embodiment of the present invention, and FIGS. 5a and 5b are explanatory diagrams of the operation of a recessed section. In the figure, 21 is the drive shaft of the rim drive part installed in /safe 24, 28 is the rim that transmits power, and 29 is the rim 28.
The ζ spring receiver 27 rotates together with the compression coil spring stored in the spring receiver 29, and the rim 28 and the spring receiver 290
A spring 82o disposed between the rim 28 and the spring receiver 29 that biases the rim 28 and the spring receiver 29 in a direction to separate them is a take-up reel, which receives power from the rim drive section and rotates. Reference numeral 23 indicates a seat for rotation of the rim 28, and reference numeral 22 indicates an upper restricting portion for preventing the rim 28 from coming off the drive shaft 21.

First, the configuration of the rim drive section will be further explained using FIG. 5.

FIG. 6a shows a state in which the take-up reel 2o and the rim 28 are both in a predetermined position.

In other words, the rim 1 drive section operates the rim 28 .・Ne receiver 29
and a compression coil spring 27.

The compression coil spring 2a has a structure in which it is sandwiched between the rim 28 and the spring receiver 29, so that the compression coil spring 27 presses the rim 28 upward in the direction of the rotation support shaft 21, and also pushes the spring receiver 29. It is pressed downward.

The rim 28 and the spring receiver 29 are urged apart by the spring 27, and as shown in FIG. Therefore, maintain a predetermined interval.

Further, this hook mechanism prevents the force of the compression coil spring 27 from being applied to the vertical regulating portions 22, 23 and the shear 24, allowing smooth rim driving.

Furthermore, the torsional force generated to compress the compression coil spring 27 between the rim 27 and the spring receiver 28 is provided in the spring receiver 29 as shown in FIG. 5a.

This is handled by a through hole 3o having a larger inner diameter than the rotating support shaft 21.

In addition, the hook mechanism with the rim 28. Since the rim drive section consisting of the spring receiver 29 and the spring 27 is integrated, it can be easily miniaturized and also easily incorporated into the device.

Next, the operation of this rim drive section will be explained using FIG. 6.

FIG. 5 shows a state in which the first take-up reel 20 has been guided to a predetermined position and has not yet smoothly engaged with the rim drive section.

Now, attach the cassette 2 to the tape drawer position (not shown), and attach the cassette 2 to the head of the rim 28 as shown in FIG.
Consider a case where the take-up reel 20 of the rim 28 and the reel 20 are in contact with each other and the rim 28 and reel 20 do not mesh properly.

At this time, the rim 28 is pressed in the direction of the spring receiver 27, but due to the elastic force of the spring 27 it attempts to return to its original position (FIG. 5a).

When the rim 28 is rotated by a motor (not shown) in this state, the reel 20 in contact with the head of the rim 28 easily rotates as shown in FIG. 5a because the teeper is formed on the head. It meshes with the rim 28.

In this case, the restoring force of the spring 27 is selected so that the cassette 2 does not come off from the predetermined position.

In this embodiment, the rim 28 for transmitting rotational force to the reel has a cylindrical shape, but the rim 28 is not limited to this, and if the take-up reel is gear-shaped, the rim 28 may have a cylindrical shape. Intermeshing gear-shaped rims may also be used.

In this case, the head teeper that was necessary for the rim 28 of the previous embodiment becomes unnecessary, and a large rotational force can be reliably transmitted to the reel.

As described above, according to the present invention, the reel of the cassette can be rotated smoothly, and the device can be easily assembled and miniaturized.

[Brief explanation of drawings]

Fig. 1 is a schematic configuration diagram of a conventional magnetic recording/reproducing device, Figs. 2a and 3a are perspective views of the rim drive section of the same device, and Figs. 2, 3, and 3C are The side view of the circulatory part, Figure 4, is
FIG. 5 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. 5 is a sectional view taken along line A-A' in FIG. 1... Supply side reel, 2... Cassette, 3... Magnetic tape, 4... Tension post, 5... Pinch roller, 6...
・Full-width erasing head, 7... entry side height regulation post,
8...Inlet inclined post, 9...Cylinder, 10...Outlet inclined post, 11...
・Exit height regulation post, 12... Impedance roller, 13... Audio oil race head, 14... Audio control head, 1
5...P4 post, 16...capstan, 17...pinch roller, 18...P
5 post, 19... rim drive section, 20... winding side reel, 21..., drive shaft, 22...
・Upper regulation part, 23...Polywanon ear, 24
・・・・・・Chassis, 26...Mark/Flip holder, 26
...stopper, 27...mark compression coil spring,
28...Rim, 29...Spring holder. Name of agent: Patent attorney Toshio Nakao and one other person Figure 1 Figure 12 Figure 13 Figure 4 Figure 5

Claims (1)

[Claims] a mounting means for mounting a cassette containing a reel wound with magnetic tape in a predetermined position; a rim rotatably supported by a substrate and rotationally driving the reel; A spring receiver that rotates together with the rim,
A compression spring is disposed between the rim and the spring receiver and biases the rim and the spring receiver in a direction to separate them, and the rim and the spring receiver engage with each other. A magnetic recording/reproducing device 0 characterized by having the following configuration.