JPS5922299B2 - Tape recorder drive device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a drive device for a tape recorder, specifically,
The present invention relates to a drive device for bringing a pinch roller into pressure contact with a capstan and bringing a magnetic head into contact with a magnetic tape in conjunction with set operations such as recording and playback.

Conventional drive devices of this type have many configurations in which, for example, the pinch roller support and the magnetic head support are individually biased with coil springs, etc., but this requires a large number of parts. Also, considerably strong elasticity is required, leading to complicated equipment and increased costs.

The present invention supports a magnetic head and a pinch roller 15 by a sliding body and a swinging body that move in a direction across a tape path, and elastically connects these sliding bodies and swinging body with a single elastic member. To provide a drive device for a 20 tape recorder, which allows smooth operation of a magnetic head, a pinch roller, and the entire device using only one elastic member, thereby completely eliminating the problems of conventional devices. purpose.

The present invention will be explained below with reference to illustrated embodiments.

FIG. 1 shows a drive device 3 for a tape recorder in which a compact cassette 1 and a micro 25 cassette 2 (indicated by two-dot chain lines) can be used alternately.

First, the outline of the configuration of this device 3 will be explained. The main parts of this drive device 3 are composed of a compact cassette drive device 303a and a micro cassette drive device 3b (each indicated by a three-dot chain line). , both drive devices 3a
, 3b are provided with capstans 4a, 4b, pinch rollers 5a, 5b, and magnetic heads 6a, 6b, respectively.

35 In this case, the compact cassette 1 is mounted with its opening facing downward, and the microcassette 2 is mounted with its opening facing upward.

In this device 3, the compact cassette 1, the micro cassette 2, and its drive device 3b (excluding the capstan 4b) are compatible, and it goes without saying that the drive device 3a operates when the compact cassette 1 is installed. However, when the micro cassette 2 and its drive device 3b are installed instead of the compact cassette 1, the drive device 3a operates, and the drive device 3b operates via this drive device 3a.

Pulleys 1J-8a and 8b are fixed to the shafts 7a and 7b of the capstans 4a and 4b, respectively, and both pulleys 8a
, 8b is wrapped with an endless belt 9 to operatively connect them. The pulley 8a is driven by a drive motor (not shown) when setting up recording, playback, etc., and rotates the pulley 8b via the endless belt 9, thereby rotating the capstans 4a and 4b together. Since the capstan 4b is connected to the capstan 4a in this way, even if the drive device 3b is attached or detached, this capstan 4
b cannot be attached or detachedG). Next, the detailed configuration and operation of the device of the present invention will be described.

In the compact cassette drive device 3a shown in FIG. 1, the capstan 4a corresponds to the pinch roller 5a, as described above, and the pinch roller 5a is mounted on one arm end of the pinch roller holder 10. It is rotatably supported by a shaft 11 provided therein.

The holder 10 has a shaft 10 embedded in the magnetic head support 12.
One end of the torsion spring 13 fitted to the shaft 10a is hung on the arm portion of the shaft 10a, and the other end of the torsion spring 13 is implanted in the magnetic head support 12. By hanging it on the fixing pin 13a, the shaft 10
The other arm is given a clockwise rotational habit about a, and the other arm is attached to the support 12. "Fixed pin 13a
It is in contact with the A shaft 12a is attached to the magnetic head support 12.
The base is rotatably supported by a magnetic head 6a, and a magnetic head 6a is fixed to the free end. This support 1
A coil spring 14 with one end hung on an immovable pin 14a is hooked on the other end of the spring 14, giving the supporting body 12 the ability to rotate counterclockwise around the shaft 12a. There is. However, the rotation range of this support body 12 is limited by an immovable pin 15. ] A coil spring 1 is installed in a portion of the magnetic head support 12 near the shaft 12a.
One end of this coil spring 16 is hung, and the other end of this coil spring 16 is hung on an operating piece 17a of an electromagnet 17 provided above this support body 12.

When the micro cassette 2 and its drive unit 3b are removed and a setting operation such as recording or playback is performed with the compact cassette 1 attached, the electromagnet 17 is activated.
Pull the magnetic head support 12 close to the pinch roller 5a.
is brought into pressure contact with the capstan 4a, and the magnetic head 6
A is brought into contact with a magnetic tape (not shown) inside the compact cassette 1.

The magnetic tape is fed while being held between a capstan 4a and a pinch roller 5a, and is subjected to processing such as recording or reproduction by a magnetic head 6a. Next, the microcassette drive device 3b will be described.

In FIG. 1, the microcassette 2 and its drive device 3b are attached to the drive device 3 instead of the compact cassette 1. The micro cassette 2 is connected to the tape hub 2.
a, 2b and guide rollers 2c, 2d, and a wound magnetic tape Ta with one end fixed to one hub 2a is placed in a tape path TaP between both guide rollers 2c, 2d.
Electrical conduction occurs via the capstan 4b, and the other end is fixed and held to the other hub 2b. In this case, the tape path TaP is located left and right, that is, in the horizontal direction in FIG. In FIG. 1, a pinch roller 5b corresponds to the capstan 4b, and the pinch roller 5b is rotatably supported by a shaft 19 installed in the center of the rocking body 18.

The rocking body 18 is rotatably supported at its base by a shaft 18a and can be moved in a direction across the tape path TaP, and has an abutting portion 18b provided at its free end.
is brought into contact with the upper edge of the upper arm portion 20a of the sliding body 20. The sliding body 20 has a tape passage TaP in its central portion.
It has an elongated hole 20b oriented substantially perpendicular to the elongated hole 20b, and is supported slidably across the tape path TaP by immovable headed pins 21a and 21b that fit into the elongated hole 20b. The upper arm 20a of the sliding body 20 extends horizontally to the right in FIG. 1, and has a magnetic head 6b fixed to its tip. This sliding body 20 is
Furthermore, a lower arm portion 20c extends in the same direction as the upper arm portion 20a.
One end of a coil spring 23 is hung on a pin 22 implanted at its tip. The other end of the coil spring 23 is hooked on a pin 24 installed in the vicinity of the left side of the pinch roller 5b of the rocking body 18, thereby elastically connecting the rocking body 18 and the sliding body 20. . However, instead of this coil spring 23,
Other elastic members may also be used. Sliding body 20
An elongated hole 20d is provided at the tip of the lower arm portion 20c, and a pin 26 implanted at one arm end of the communication lever 25 is engaged with this elongated hole 20d.

The communication lever 25 is rotatably supported by a shaft 25a, and a pressed portion 25b provided at the other end of the arm is located on the movement path of the pinch roller 5a. Now, when a setting operation such as recording or playback is performed with the microcassette 2 and its driving device 3b attached to the driving device 3, the electromagnet 17 is activated in the same way as in the case of the compact cassette 1, and the magnetic head is supported. Pull the body 12 closer.

However, in this case, since the pressed portion 25b of the communication lever 25 is waiting on the moving path ground of the pinch roller 5a, the pinch roller 5a comes into contact with this pressed portion 25b, presses it, and presses the capstan. It does not come into contact with 4a.
The pinch roller 5a is the pressed part 25b of the communication lever 25.
When pressed, the communication lever 25 rotates counterclockwise around the shaft 25a, and its pin 26 moves the slider 20 downward in FIG.

Then, the sliding body 20 moves until the lower edge of its lower arm 20c comes into contact with the immovable pin 27, and as shown in FIG. contact with. When the sliding body 20 is displaced in this manner, the oscillating body 18 follows this sliding body 20 due to the strength of the coil spring 23, and moves the pinch roller 5b to the capstan 4b, as shown in FIG. Apply pressure.

There, the magnetic tape Ta is fed by a capstan 4b and a pinch roller 5b, and subjected to processing such as recording or reproduction by a magnetic head 6b. The operation of the coil spring 23 will now be explained in more detail with reference to FIGS. 3 and 4.

In FIG. 3, the initial position of each related member is shown by a solid line, and the position after displacement is shown by a chain line with the same reference numeral and the suffix A. In other words, the communication lever 25
When the pin 26 moves to the chain line position 25A, the pin 26 also moves to the chain line position 26A, and the sliding body 20 also moves to the chain line position 20A. The amount of displacement of the sliding body at this time is determined by the lower arm 20
Let it be expressed as d1 when viewed from the movement of c. On the other hand, when the sliding body 20 is displaced, the rocking body 18 is also rotationally displaced to the chain line position 18A. The amount of rotational displacement of the rocking body 18 at this time is assumed to be θ°. The amount of displacement of the contact point 28 between the contact portion 18b of the rocking body 18 and the upper arm portion 20a of the sliding body 20 up to point 28A is very close to the displacement amount d1 of the sliding body 20, which is It is assumed to be equal to the quantity d1. In addition, the lower arm portion 2 of the sliding body 20 on which one end of the coil spring 23 is hung
The amount of displacement of the pin 22 on 0c to the chain line position 22A is also
It is equal to the displacement amount D of the sliding body 20. At this point, the oscillating body 18 on which the other end of the coil spring 23 (shown as a straight line) is hung
The amount of displacement of the upper pin 24 to the chain line position 24A is D.
The center point of the shaft 18a of the rocking body 18 is set to A, and from the point A to the contact point 2
R is the distance from point A to pin 24, R is the distance from point A to pin 24,
Let Bl be the triangle formed by connecting point A, the contact point 28, and its displacement point 28A, and B2 be the triangle formed by connecting point A, the pin 24, and its displacement position 24A, respectively. Triangle B1 and triangle B2 are
Since they are isosceles triangles with equal apex angles of θ°, they are similar to each other, and the relationship holds true.

On the other hand, the coil spring 23 is connected to the sliding body 20 and the rocking body 1.
As is clear from FIG. 4, let S be the elongation when it shifts according to the shift from 8 and occupies the 23A position.

However, slight differences will be ignored. Because it is, Substituting this into 2 equations and rearranging it, we get becomes.

That is, when the sliding body 20 is pressed and displaced via the communication lever 25, the coil spring 23 is always extended by the value S shown in equation 4 from the initial state, and due to the charge, the pinch roller 5b is moved to the capstan 4b. When the contact lever 25 is brought into pressure contact and the pressure on the communication lever 25 is removed, the sliding body 20 and the oscillating body 18 contract by this stretch S, and the sliding body 20 and the rocking body 18 are
Return to the stable position, that is, the initial position (see Figure 1).

As is clear from Equation 4, the larger the amount of displacement of the sliding body and the amount of rotation of the oscillator, and the farther the contact point 28 and pin 24 are, the greater the value for the extension S of the coil spring 23. It can be done.

In this sense, FIG. 5 shows that the engaging arm 30 is extended to the position of the rocking body 18 where the pin 24 is installed, and the coil spring 2 is
An example is shown in which the engagement position of No. 3 is adjusted on the serrated edge 30a. In this way, the extension S of the coil spring 23 can be optimally adjusted depending on the relationship between the capstan 4b and the pinch roller 5b. According to this invention, the sliding body 20 and the oscillating body 18 can be operated in conjunction with only 231 coil springs, and the magnetic head 6b and the pinch roller 5 can be operated very smoothly.
b can be placed in an operating position relative to the magnetic tape Ta. In FIG. 6, the sliding body 20 is biased by a coil spring 31, and the swinging body 18 is biased by a torsion spring 32 that is fitted onto the shaft 18a and whose other end is locked with a pin 32a. In this case, for example, the pressing pressure of the pinch roller 5b against the capstan 4b is set to 200 gr. Then, the coil spring 31 has 30
0 gr. Resilience is necessary.

Further, in FIG. 7, a pinch roller holder 33 is rotatably mounted on the upper arm 20a of the sliding body 20 by a shaft 33a, and a pinch roller 5b is rotated by a shaft 119 implanted in the holder 33. The shaft 3 is movably supported, and the holding lever 33 has a shaft 3.
The pinch roller 5b is connected to the capstan 4 by a torsion spring 34 which is fitted into the capstan 3a and whose other end is locked by a pin 34a.
A configuration is shown in which the pinch roller 5b has a tendency to press against the capstan 4b and is regulated by a stopper 35, but even in this case, the pressure of the pinch roller 5b against the capstan 4b is set at 200 gr. Then, the coil spring 31 has 2
50 gr. Resilience is necessary. On the other hand, in the device of the present invention, the pressure of the pinch roller 5b against the capstan 4b is 200 gr. When , coil spring 2
3 is the same 200gr. It is sufficient if the coil spring 23 has an elasticity of
Moreover, the strength of the surrounding members is relatively weak, which has the advantage of being sufficient. The tape recorder driving device of the present invention can also be fully applied to tape recorders that use only either a compact cassette or a micro cassette.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a tape recorder drive device showing an embodiment of the present invention, Fig. 2 is a plan view showing the operating state of the device shown in Fig. 1, and Fig. 3 is a plan view showing the operating state of the coil spring. FIG. 4 is a diagram showing the expansion of the coil spring; FIG. 5 is a plan view of the rocking body portion showing how the engaging arm is installed in the present invention;
6 and 7 are plan views respectively illustrating devices having similar configurations to the device of the present invention. 3... Tape recorder drive device, 3a...
...Compact cassette drive device, 3b...
...Microcassette drive device, 4a, 4b...
...Capstan, 5a, 5b...Pinch roller, 6a, 6b...Magnetic head, Ta...
...magnetic tape, TaP...tape passage, 1
8... Rocking body, 20... Sliding body, 23
・・・・・・Coil spring as elastic member, 25
・・・・・・Communication lever.

Claims (1)

[Scope of Claims] 1. A sliding body provided to be slidable in a direction across the tape path, a rocking body provided to be rotatable in a direction across the tape path, and a device supported by the sliding body. a pinch roller supported by the rocking body; a contact portion provided on the rocking body and abutting the sliding body; one end attached to the sliding body and the other end attached to the rocking body; It comprises an elastic member attached between the swinging fulcrum of the moving body and the abutting portion, and a pressing means that moves the sliding body supporting the magnetic head to an operating position in conjunction with an external setting operation. Tape recorder drive unit. 2. Between the rocking fulcrum of the rocking body and the abutting part where the rocking body abuts the sliding body, an engaging arm is extended to the rocking body in a direction that connects the rocking body fulcrum and the abutting part. 2. The drive device for a tape recorder according to claim 1, wherein the elastic member is provided at a position where the elastic member is engaged with the elastic member and is displaceable.