JPH08180511A - Reel lock mechanism of magnetic recording/reproducing apparatus - Google Patents

Abstract

PURPOSE: To obtain a reel lock mechanism of a magnetic recording/reproducing apparatus which generates only a small sounds at the loading/unloading time and is simple in constitution. CONSTITUTION: A ratchet 1a is set in the whole periphery of an outer edge of a wind reel stage 1. A hook part 2a of a lock lever 2 is engaged with the ratchet 1a. The lock lever 2 is supported to be rotatable around a shaft 3 fixed to a main chassis 50 and urged by a latch spring 4 in the clockwise direction at all times. A release lever 5 is also set rotatably below the lock lever shaft 3. The release lever 5 urges the lock lever 2 via a double-acting spring 6. At the loading time, when a driving cam 7 rotates in the clockwise direction, a projecting part 7a of the driving cam 7 hits the release lever 5 thereby to rotate the release lever 5 in the counterclockwise direction. Accordingly, the hook part 2a of the lock lever 2 is separated from the ratchet 1a, thereby, the lock of the reel is released.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reel lock mechanism of a magnetic recording / reproducing apparatus, and more particularly to a reel lock mechanism of a magnetic recording / reproducing apparatus for loading / unloading a tape by locking a reel stand on one side.

[0002]

2. Description of the Related Art In a magnetic recording / reproducing apparatus for pulling out a tape from a tape cassette, winding it around a rotary drum for recording / reproducing, one reel base is locked by loading / unloading, and the tape is pulled out from the other reel base. Then, when the tape cassette at the end of winding is loaded when the winding side is locked, or when the tape cassette at the beginning of winding is loaded when the supply side is locked, normal loading becomes impossible. . A mechanism capable of loading even in such a case is disclosed in Japanese Patent Application Laid-Open No. 4-248157.

FIG. 16 is a plan view of a loading mechanism corresponding to FIG. 2 in Japanese Patent Laid-Open No. 4-248157.

Referring to the drawing, a spiral release gear 118 having a gradually expanded diameter in the circumferential direction meshes with a gear portion 114a of a take-up reel 114, whereby an engaging portion 117b of a lock lever 117 and a take-up portion are wound. Ratchet part 114 of reel stand 114
The engagement with b is released.

[0005]

However, in the above-mentioned conventional example, there are problems that the loading structure is complicated, and that abnormal noise is generated due to meshing of gears during unloading.

Further, since the parts are divided into the slide chassis side and the main chassis side, the positional accuracy of the slide chassis side parts with respect to the main chassis side parts deteriorates. Further, since the sliding operation on the slide chassis side is used to drive the lock lever, there is a problem that it cannot be used for a non-sliding mechanism.

The present invention has been made in order to solve the above problems, produces a low noise during loading / unloading, and can be applied to a non-sliding mechanism.
An object of the present invention is to provide a reel lock mechanism of a magnetic recording / reproducing apparatus having a simple structure.

[0008]

According to a first aspect of the present invention, there is provided a reel lock mechanism for a magnetic recording / reproducing apparatus, comprising:
A reel lock mechanism of a magnetic recording / reproducing device for controlling the rotation of a reel base at the time of unloading, a ratchet formed on the outer edge of the reel base, and a lock rotatable about an axis and engageable with the ratchet. A lever, an urging means for urging the lock lever to engage with the ratchet, a release lever mounted rotatably around an axis and connected to the lock lever via a double-acting spring, Under the condition, there is provided control means for controlling the release lever to rotate in a direction to release the lock lever from the engagement with the ratchet.

The reel lock mechanism of the magnetic recording / reproducing apparatus according to the third aspect of the present invention is a reel lock mechanism of the magnetic recording / reproducing apparatus for controlling the rotation of the reel base during loading / unloading, and is formed on the outer edge of the reel base. Ratchet, a lock lever rotatable about an axis and engageable with the ratchet, an urging means for urging the lock lever to engage the ratchet, and a direction crossing the axis of the axis. A shifter that can move freely, and a release lever that is rotatably attached to the shifter and that can engage with the lock lever, and that rotates the release lever in a direction that releases the lock lever from engaging with the ratchet under certain conditions. And a control means for controlling the movement of the shifter.

[0010]

According to the first aspect of the invention, the control means rotates the release lever so as to release the engagement between the lock lever and the ratchet under a predetermined condition.

In a third aspect of the invention, under a predetermined condition, the control means moves the shifter so as to rotate the release lever in order to release the engagement between the lock lever and the ratchet.

[0012]

1 is a plan view showing the overall construction of a loading mechanism of a magnetic recording / reproducing apparatus according to a first embodiment of the present invention.

Referring to the drawing, a supply reel base 51 and a take-up reel base 1 are located on the front side of the main chassis 50, and a tape 56 of a tape cassette 55 is wound on the back side thereof at the time of loading. The loading mechanism is configured such that the attached rotary drum 53 is positioned.

FIG. 2 is a take-up reel stand 1 shown in FIG.
FIG. 4 is a plan view showing the surrounding structure, FIG. 3 is a side view showing a state in which the reel 20 of the tape cassette is mounted on the take-up reel stand 1 of FIG. 1, and FIG. 4 is a plan view of FIG. It is the figure which took out only and the lock lever 2, and enlarged this.

The structure and operation of the reel lock mechanism will be described with reference to these drawings.

A ratchet 1a is provided all around the outer edge of the take-up reel base 1. The claw portion 2a of the lock lever 2 is engaged with the ratchet 1a. The lock lever 2 is rotatably mounted around a lock lever shaft 3 fixed to the main chassis 50, and is always biased clockwise by a latch spring 4. Also, a release lever 5 is rotatably provided below the lock lever shaft 3. The release lever 5 biases the lock lever 2 via a double-acting spring 6. On the back surface of the drive cam 7, protrusions 7a and 7b having a shape as shown in the figure are provided.

The reel 20 on which the tape is wound is engaged with the reel base 1 so that the rotational force is transmitted therefrom. The reel base 1 is rotatably supported by a reel base shaft 21a fixed to the main chassis 50. A drive cam 7 is provided below the reel base 1. In addition,
The claw portion 2a of the lock lever 2 is the ratchet 1 of the reel base 1.
The release lever 5 is provided at a height that engages a, and the release lever 5 is disposed at a height that interferes with the protrusions 7a and 7b of the drive cam 7.

FIG. 5 is a diagram showing the operation of the reel lock mechanism according to the first embodiment of the present invention during loading.

Referring to the drawing, in the "standby" state before entering the loading state, as shown in the drawing, the claw portion 2a of the lock lever 2 has a ratchet 1a (not shown) of the take-up reel stand 1. ) To lock the rotation of the reel. When there is a loading instruction, the drive cam 7 rotates clockwise as indicated by the arrow,
As shown in the "before loading" state, the protrusion 7a of the drive cam 7 hits the release lever 5, and the release lever 5 rotates counterclockwise. This releases the release lever 5
Rotates the lock lever 2 counterclockwise via the double-acting spring 6 to move the claw portion 2a of the lock lever 2 and the ratchet 1a.
To disengage from. Then, the locked state of rotation of the reel is released.

If it is detected that the tape cassette at the end of winding is loaded, the drive cam 7 is stopped in this "before loading" state to rewind (RE).
After performing W) for a predetermined amount, the drive cam 7 may be rotated. As a result, only the tape required for loading can be held on the supply reel stand, so that the loading can be performed thereafter with the take-up reel stand locked.

On the other hand, when the tape cassette which is not in the winding end state is loaded, the drive cam 7 may be rotated as it is without being stopped. Then, as shown in the "loading" state, the release lever 5 and the drive cam 7
Since the engagement with the projection 7a is released, the claw 2a of the lock lever 2 engages with the ratchet 1a, and the rotation of the take-up reel stand is locked. After that, ratchet 1a and claw 2a
The tape is pulled out from the supply rule side while keeping the engagement with and the tape is wound around the rotary drum 53, and the loading is completed.

When shifting from this state to the "PLAY" mode, the drive cam 7 is further rotated clockwise. Then, the release lever 5 comes into contact with the protrusion 7b and the lock lever 2
Claw part 2a of the take-up reel stand 1 comes off the ratchet 1a.
Becomes rotatable, and the tape can be wound by recording or reproducing.

FIG. 6 is a diagram showing the operation of the reel lock mechanism according to the first embodiment of the present invention during unloading.

Referring to the drawing, at the time of "PLAY" before entering the unloading state, the release lever 5 contacts the projection 7b of the drive cam 7, and the drive cam 7 rotates counterclockwise. By this rotation of the release lever 5, the lock lever 2 rotates counterclockwise, and the claw portion 2a is disengaged from the ratchet portion 1a of the reel base 1. When unloading is started from this state, the drive cam 7 rotates counterclockwise as indicated by an arrow. As a result, the release lever 5 is disengaged from the protrusion 7b, and the latch spring 4 causes the release lever 5 to rotate clockwise. Then, the lock lever 2 also rotates clockwise, and the ratchet portion 1 of the reel stand 1
The claw portion 2a is engaged with a to fix the reel base 1. Further, when the drive cam 7 rotates counterclockwise, the projection 7a of the drive cam 7 contacts the release lever 5, and the release lever 5 rotates clockwise. The release lever 5 is rotatable because the release lever 5 and the lock lever 2 are connected by the double acting spring 6. If the release lever and the lock lever 2 are directly connected, since the rotation of the lock lever is restricted by the reel base 1, the release lever 5 is also restricted in rotation. Therefore, the drive cam 7 cannot rotate counterclockwise any more, and unloading cannot be performed.

When the drive cam 7 is further rotated counterclockwise, the protrusion 7a is released from the release lever 5, the lock lever 2 is biased by the latch spring 4, and the claw 2a thereof is brought into contact with the ratchet portion 1a of the reel base 1. It remains engaged. This makes it possible to fix one reel (winding side) at the time of unloading and wind the tape to the other reel (supply side).

FIG. 7 is a diagram showing the structure of the power transmission mechanism at the time of loading according to the first embodiment of the present invention.

Referring to the drawing, the power for driving drive cam 7 is transmitted in the order of loading motor unit 25 → mode switch 23 → main cam 9 → idler gear 24 → drive cam 7. Loading motor unit 25
Is composed of a motor and a speed reduction unit. The mode switch 23 has three terminals, and its terminal output changes depending on the rotation angle of the mode switch 23. The drive cam 7 is gear-connected to the mode switch 23. The rotation angle of the drive cam 7 is controlled by the output of the mode switch 23.

FIG. 8 is a plan view showing the structure on the take-up reel side of the loading mechanism of the magnetic recording / reproducing apparatus according to the second embodiment of the present invention, and FIG. 9 is a view of the tape cassette on the take-up reel stand of FIG. FIG. 11 is a side view of a state in which a reel is loaded, and FIG. 10 is an enlarged view of the configuration around the take-up reel stand in FIG. 8.

The configuration and operation of the reel lock mechanism will be described with reference to these figures.

A ratchet 1a is provided on the entire outer circumference of the take-up reel base 1 and is rotatably supported by a reel base shaft 21a. The ratchet 1a is engaged with the claw portion 2a of the lock lever 2. The lock lever 2 is rotatably supported around the lock lever 3, and is always biased clockwise by a latch spring 4.

On the other hand, a release lever 5 is rotatably provided on the elongated shifter 8. The release lever 5 is urged by the double acting spring 6 from the shifter 8. The drive cam 10 is provided with a cam groove 9a. The reel 20 around which the tape is wound is engaged with the reel base 1 so that the rotational force is transmitted by the reel base 1. Reel stand 1
Are rotatably supported by a reel base shaft 21a fixed to the chassis 50. A shifter 8 is provided below the reel stand 1. A drive cam 10 is provided below the shifter 8. The lock lever 2 is rotatably supported around a shaft 3 fixed to the sub chassis 22. Further, the claw portion 2a of the lock lever 2 is arranged at a height that engages with the ratchet 1a of the reel base 1. The pin 2b provided on the lock lever 2 is provided in the cam groove 8 of the shifter 8.
It extends to a height that engages with a.

When the drive cam 10 rotates clockwise, the shifter 8 moves to the left due to the engagement with the cam groove 10a, whereby the release lever 5 also moves to the left. Then, the pin 2b of the lock lever 2 is hooked on the groove portion 5a of the release lever 5, the lock lever 2 rotates around the shaft 3 in the counterclockwise direction, and the pawl portion 2a is disengaged from the ratchet 1a.

11 and 12 are diagrams showing the loading operation of the reel lock mechanism according to the second embodiment of the present invention.

Referring to the figure, in the "standby" state before entering the loading state, as shown in the figure,
The claw portion 2a of the lock lever 2 is positioned so as to engage with the ratchet 1a of the take-up reel base 1, and locks the rotation of the reel. When a loading instruction is given, the drive cam 10 rotates clockwise as indicated by the arrow. As a result, as shown in the "before loading" state, the shifter 8 moves to the left by changing the engagement position of the drive cam 10 with the cam groove 10a. Along with this, the release lever 5 moves the pin 2b of the lock lever 2 to the left. That is, the lock lever 2 is the lock lever shaft 3
Is rotated in the counterclockwise direction, and the engagement between the claw portion 2a and the ratchet 1a of the take-up reel stand 1 is released. Then, the locked state of rotation of the reel is released. If it is detected that the tape cassette in the end-of-winding state is loaded, the drive cam 10 is stopped in this state, rewinding (REW) is performed for a predetermined amount, and then the drive cam 10 is rotated. Just do it. As a result, only the tape required for loading can be held on the supply reel stand, so that the loading can be performed thereafter with the take-up reel stand locked.

On the other hand, when a tape cassette which is not in the winding end state is loaded, the drive cam 9 may be continuously rotated without being stopped. Then, as shown in the "loading" state, the shifter 8 further moves to the left, and the engagement between the release lever 5 and the pin 2b is released. Then, the lock lever 2 is pressed by the biasing force of the latch spring 4.
Rotates clockwise around the lock lever shaft 3 and its claw portion 2a engages with the ratchet 1a of the take-up reel stand 1 to lock the rotation of the take-up reel stand.

After that, the tape is pulled out from the supply reel side while keeping the engagement between the ratchet 1a and the claw portion 2a,
The tape is wound around the rotary drum 53, and the loading is completed.

To shift from this state to the "PLAY" mode, the drive cam 10 is further rotated clockwise to move the shifter further left. Then, the cam groove 8a of the shifter 8 moves the pin 2b to rotate the lock lever 2 counterclockwise, thereby releasing the engagement between the claw portion 2a and the ratchet 1a and rotating the take-up reel base 1. Becomes possible,
You will be able to wind the tape.

13 and 14 are diagrams showing the operation of the reel lock mechanism according to the second embodiment of the present invention during unloading.

Referring to the drawing, in the "PLAY" mode before entering the unloading state, the cam groove 8a of the shifter 8 is
Depending on the position, the claw portion 2a of the lock lever 2 is set to the reel base 1
Has been released from the ratchet 1a. When unloading is started from this state, the drive cam 10 rotates counterclockwise. As a result, the shifter 8 moves to the right and the pin 2b of the lock lever 2 moves into the cam groove 8a of the shifter 8.
To the expanded position of the lock lever 2 and the latch spring 4
Rotates clockwise by the ratchet 1a of the reel stand 1
To fix the reel base 1. Furthermore, the drive cam 1
When 0 is rotated counterclockwise, the shifter 8 moves further to the right, the release lever 5 and the pin 2b of the lock lever 2 come into contact, and the release lever 5 rotates counterclockwise. The shifter 8 can move even in such a state because the release lever 5 is biased from the shifter 8 by the double-acting spring 6. If the release lever 5 is provided directly on the shifter 8, the rotation of the lock lever 2 is restricted by the reel base 1, so the movement of the shifter 8 is also restricted. Therefore, the drive cam 10 cannot rotate any more, and unloading cannot be performed. Further, when the drive cam 10 is rotated counterclockwise, the pin 2b of the lock lever 2 fits into the groove 5a of the release lever 5. As a result, the claw portion 2a of the lock lever 2 and the ratchet 1a of the take-up reel base 1 are engaged with each other, and the rotation of the reel base 1 is locked. Therefore, one reel (winding side) is fixed during unloading. The reel can be wound on the other side (supply side).

FIG. 15 is a diagram showing the structure of the power transmission mechanism in the loading mechanism according to the second embodiment of the present invention.

Referring to the drawing, the power for driving drive cam 10 is transmitted in the order of loading motor unit 25 → mode switch 23 → drive cam 10.

The loading motor 25 is composed of a motor and a speed reduction unit. The mode switch 23 has three terminals, and the terminal output is the mode switch 23.
It changes depending on the rotation angle of. Since the drive cam 9 is gear-connected to the mode switch 23, the rotation angle of the drive cam 9 is controlled by the output of the mode switch 23.

In both of the above embodiments, the reel lock mechanism of the present invention is applied to the take-up reel base, but the reel lock mechanism of the present invention may be applied to the supply reel base instead of the take-up reel base. . In this case, in the above embodiment, the winding state is set to the winding start state, and the rewinding (REW) is performed by the forward (F
It should be read as F).

[0044]

According to the first aspect of the present invention, as described above,
Under a predetermined condition, the control means rotates the release lever so as to release the engagement between the lock lever and the ratchet, so that the reel is unlocked when the tape cassette at the winding or winding start is loaded. Will be easier.

As described above, the control means moves the shifter so as to rotate the release lever in the direction for releasing the engagement between the lock lever and the ratchet under the predetermined condition. It becomes easy to unlock the reels when the tape cassette of the take-up or winding start is loaded.

[Brief description of drawings]

FIG. 1 is a plan view showing the overall configuration of a loading mechanism of a magnetic recording / reproducing apparatus according to a first embodiment of the present invention.

FIG. 2 is a plan view showing a configuration around a take-up reel stand shown in FIG.

FIG. 3 is a side view showing a state where a reel of a tape cassette is mounted on the take-up reel stand of FIG.

FIG. 4 is an enlarged view of a drive cam and a lock lever taken out from the plan view of FIG.

FIG. 5 is a diagram showing an operation during loading of the reel lock mechanism according to the first embodiment of the present invention.

FIG. 6 is a diagram showing an operation during unloading of the reel lock mechanism according to the first embodiment of the present invention.

FIG. 7 is a diagram showing a configuration of a power transmission mechanism in the loading mechanism according to the first embodiment of the present invention.

FIG. 8 is a plan view showing the structure of the loading mechanism of the magnetic recording / reproducing apparatus according to the second embodiment of the present invention on the take-up reel side.

9 is a side view showing a state in which a reel of a tape cassette is mounted on the take-up reel stand of FIG.

FIG. 10 is an enlarged view of the configuration around the take-up reel base in FIG.

FIG. 11 is a diagram showing a part of the loading operation of the reel lock mechanism according to the second embodiment of the present invention.

FIG. 12 is a diagram showing another part of the loading operation of the reel lock mechanism according to the second embodiment of the present invention.

FIG. 13 is a diagram showing a part of the operation of the reel lock mechanism according to the second embodiment of the present invention during unloading.

FIG. 14 is a diagram showing another part of the operation during unloading of the reel lock mechanism according to the second embodiment of the present invention.

FIG. 15 is a diagram showing a structure of a power transmission mechanism in a loading mechanism according to a second embodiment of the present invention.

FIG. 16 is a diagram showing a configuration of a reel lock mechanism of a conventional magnetic recording / reproducing apparatus.

[Explanation of symbols]

1 Take-up reel base 1a Ratchet 2 Lock lever 2a Claw 2b Pin 3 Lock lever shaft 4 Latch spring 5 Release lever 6 Double acting spring 7 Drive cams 7a, 7b Projection 8 Shifter 8a Cam groove 10 Drive cam 10a Cam groove In the figure, the same reference numerals indicate the same or corresponding parts.

Claims (4)

[Claims] 1. A reel lock mechanism of a magnetic recording / reproducing apparatus for controlling rotation of a reel base during loading / unloading, comprising a ratchet formed on an outer edge of the reel base and rotatable about an axis. A lock lever engageable with the ratchet, an urging means for urging the lock lever to engage with the ratchet, a rotatably mounted around the shaft, and a double-acting spring with respect to the lock lever. A magnetic recording / reproducing apparatus including: a release lever connected via a lock lever; and a control unit that controls to rotate the release lever in a direction to release the lock lever from the engagement with the ratchet under a predetermined condition. Reel lock mechanism. 2. The control means includes a rotatable drive cam, and a protrusion provided on the drive cam and abutting against the release lever to rotate the release lever according to a rotational position of the drive cam. The reel lock mechanism of the magnetic recording / reproducing apparatus according to claim 1. 3. A reel lock mechanism of a magnetic recording / reproducing apparatus for controlling the rotation of a reel base during loading / unloading, comprising a ratchet formed on the outer edge of the reel base and rotatable about an axis. A lock lever engageable with the ratchet; an urging means for urging the lock lever to engage with the ratchet; a shifter movable in a direction transverse to the axis of the shaft; A release lever that is rotatably attached to the lock lever and that is engageable with the lock lever, and that moves the shifter so as to rotate the release lever in a direction to release the lock lever from the engagement of the ratchet under predetermined conditions. A reel lock mechanism of a magnetic recording / reproducing apparatus, comprising: 4. The control means is provided with a rotatable drive cam, and is provided on the drive cam, and engages with a part of the shifter so as to control movement of the shifter according to a rotational position of the drive cam. The reel lock mechanism of the magnetic recording / reproducing apparatus according to claim 3, further comprising a groove.