JPS62200558A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To attain the cost reduction of a device by moving a mode plate to a prescribed position corresponding to an operation mode, and driving an arm, a pinch arm, and a braking means with a cam accompanying by the movement of the mode plate. CONSTITUTION:A cam 11 formed on a mode plate 1 is abutted with the pin 12 of a release driving arm 13, and with a spring 18, a release arm 17 is energized in a counterclockwise direction centering a fulcrum 19, and therefore, the driving arm 13 having a pin 15 fitted in a long hole 16 at the arm 17 is impossible to turn in a clockwise direction. However, by moving the mode plate 1 to the leftward direction, abutting between the cam 11 and the pin 12 is released, and the driving arm 13 turns in the clockwise direction centering a fulcrum 14, and also, the arm 17 turns in the counterclockwise direction centering the fulcrum 19 respectively with the energizing force of the spring 18. Therefore, a pin 21 studded with the arm 17 is moved to the downward direction in figure, and a lock is released by releasing the locking mechanism (not shown in figure) of a cassette 56, and the reel is set free to rotate, and a magnetic tape 38 wound on the reel can be drawn from the cassette 56.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to magnetic recording in which information is recorded and reproduced by a rotating head on a magnetic tape housed in a cassette, typified by a cassette video tape recorder, R-DAT, etc. Regarding a playback device.

[Summary of the invention]

In the present invention, an arm having a pull-out portion that moves a mode plate in accordance with the operation mode and pulls out a magnetic tape from a cassette using a cam formed on the mode plate;
At least a pinch arm having a pinch roller and a brake means for applying a brake to a reel stand for rotating a reel are driven.

[Conventional technology]

In cassette video tape recorders, R-DATs, and the like, a magnetic tape is pulled out from a cassette and loaded onto a drum, and information is recorded and reproduced using a rotating head. Therefore, at least a mechanism for pulling out the magnetic tape from the cassette, moving the pinch roller toward the capstan, and releasing the brake on the reel stand must be operated at predetermined timing.

Conventionally, each of these mechanisms was driven by independent means.

[Problem that the invention seeks to solve]

As described above, in the conventional magnetic recording/reproducing apparatus, each mechanism is driven by an independent means, which has the disadvantage of not only increasing the number of parts and making the apparatus complicated but also large in size. In addition, it took time to adjust the timing of each mechanism's operation, resulting in poor work efficiency during manufacturing.

[Means for solving problems]

The present invention relates to a magnetic recording/reproducing device in which a magnetic tape pulled out from a cassette is loaded onto a drum and information is recorded/reproduced using a rotating head. A cam, an arm that has a drawer part for pulling out the magnetic tape and is rotatable around a predetermined fulcrum, a pinch arm that has a pinch roller and can be rotated around a predetermined fulcrum, and the magnetic tape is wound around the arm. It is equipped with a reel stand that drives the reel of the cassette being rotated, and a brake means that applies a brake to the reel stand, and moves the mode plate to a predetermined position corresponding to the operating mode, and cams as the mode plate moves. The invention is characterized in that at least the arm, the pinch arm, and the brake means are driven by the arm.

[Effect]

In the present invention, the mode plate is moved to a predetermined position relative to the chassis in accordance with the operating mode. A cam is formed on the mode plate, and the cam drives the arm, pinch arm, and brake means as the mode plate moves. Therefore, the operation of pulling out the magnetic tape by the pull-out portion of the arm, the operation of moving the pinch roller supported by the pinch arm, and the operation of releasing the brake by the brake means are performed at predetermined timing.

〔Example〕

The present invention will be described in detail below with reference to the drawings.

In the figure, 1 is a mode plate, which has a long hole 2 and a rack 3. Reference numeral 4 designates a pin implanted in the chassis 5, which is fitted into the elongated hole 2 to guide the movement of the mode plate 1.The rotation of a gear 6 driven by a worm (not shown) causes the rack 3 to rotate. The speed reduction mechanism 8 is configured to transmit the signal to the gear 7 meshing with the speed reduction mechanism 8 . Reduction mechanism 8
An encoder 9 is provided on the lower surface of one gear constituting the. Therefore, the mode motor (not shown) coupled to the worm is rotated, the mode plate 1 is moved in the left and right directions in the figure via the deceleration mechanism 8, and the mode motor is controlled by a control circuit (not shown) in response to a signal from the encoder 9. control,
The mode plate 1 can be stopped at a position corresponding to a predetermined mode.

In the eject mode in which the cassette 56 is ejected (or conversely installed), each mechanism is in the state shown in FIG. At this time, the mode plate 1 is located at the rightmost side on the chassis 5, and when another predetermined operation mode is selected or designated, it is sequentially moved to the left in the figure in accordance with the operation mode.

When the loading mode is selected, the mode plate 1 is moved from the position shown in FIG. 1 to the position shown in FIG.

The cam 11 formed on the mode plate 1 is in contact with the pin 12 of the release drive arm 13 in the state shown in FIG. Therefore, the spring 18 urges the release arm 17 counterclockwise around the fulcrum 19, and the pin 15 fitted into the elongated hole 16 of the release arm 17
The release drive arm 13 having a diameter cannot be rotated clockwise.

However, when the mode plate 1 moves to the left, the contact between the cam 11 and the pin 12 is released, and the urging force of the spring 18 causes the release drive arm 13 to move to the fulcrum 14.
clockwise around the center, and the release arm 17 is
Counterclockwise around 9.

Each is rotated (Fig. 2). As a result, release arm 1
The pin 21 implanted in the cassette 7 moves downward in the figure and presses the locking mechanism (not shown) of the cassette 56 to release the lock, thereby making the reel rotatable. Therefore, the magnetic tape 38 wound on the reel can be pulled out from the cassette 56.

Further, when the mode plate 1 moves to the left, the contact between the cam 22 and the pin 23 is released, and the connecting arm 24 having the pin 23 becomes rotatable about the fulcrum 25. The pin 26 fixed to the connecting arm 24 is fitted into the elongated hole 28 of the slide plate 27, and the pin 26 is fixed to the connecting arm 24.
7 is urged upward in the figure by a spring 29.

Therefore, the slide plate 27 moves upward due to the biasing force of the spring 29, and the connecting arm 24 rotates counterclockwise about the fulcrum 25. At this time, a pin 32 fixed to the chassis 5 is fitted into the elongated hole 31 of the slide plate 27, and guides the movement of the slide plate 27. Since the pin 35 fixed to the drawer arm 34 engages with the notch 36 of the slide plate 27,
As the slide plate 27 moves, the pin 35 is pressed upward, and the drawer arm 34 rotates clockwise about the fulcrum 33. As a result, the drawer portion 37 fixed to the drawer arm 34 pulls out the magnetic tape 38 from the cassette 56. When the slide plate 27 slides to the position shown in FIG. 3, the pin 39 implanted in the drawer arm 34 engages with the notch 41 of the slide plate 27. The drawer arm 34 is thus positioned.

On the other hand, when the mode plate 1 moves to the left, its end presses the pin 51 of the tension regulator (TR) drive arm 45. Therefore, due to the biasing force of the spring 48 stretched between the band arm 47 and the pole 4
The drive arm 45, which was in the position where it abuts the spring 9, rotates clockwise about the fulcrum 46 against the biasing force of the spring 48.

A pin 52 of a tension regulator (TR) arm 53 is engaged with a notch 54 of the drive arm 45 . As a result, the tension regulator arm 53 rotates counterclockwise about the fulcrum 55. A pull-out portion 57 is embedded in the tension regulator arm 53, and the magnetic tape 38 is pulled out from the cassette 56 (FIG. 2).

As described above, while the mode plate 1 moves from the position shown in FIG. 1 to the position shown in FIG. . When the mode plate 1 has moved to the position shown in FIG. 3, the first rotor de-ing ring 58 is rotated clockwise in the figure by means not shown, and the magnetic tape 38, which has been pulled out slightly, is loaded onto a drum (not shown). threading).

Incidentally, when the mode plate 1 is in the position shown in FIG.
TH) It is not in contact with the pin 62 of the brake arm 64. Therefore, the threading brake arm 64 is rotated clockwise about the fulcrum 63 by the biasing force of the spring 67, and the end 65 to which the felt or the like is fixed is in contact with the reel stand 66 of the take-up reel. As a result, during loading, the take-up reel cannot rotate and the magnetic tape 38 is drawn only from the supply reel.

After the loading of the magnetic tape 38 is completed, when the fast forward (F F) or rewind (REV) mode is designated, the mode plate 1 is further driven to the left and moves from the position shown in FIG. 3 to the fifth position. It is moved to the position shown in the figure.

When the mode plate 1 moves to the position shown in FIG. 5, the cam 61 suppresses the pin 62 of the threading brake arm 64.
4 rotates counterclockwise against the biasing force of the spring 67. Therefore, the end portion 65 is separated from the reel stand 66, the brake is released, and the magnetic tape 38 can be fast-forwarded or rewound (FIG. 4).

The drive pulley 137 moves clockwise when rapid forwarding is performed.
Also, when rewinding is performed, each is rotated counterclockwise. An idler 136 rotatably supported by a connecting member 133 that is rotatable about a fulcrum 132 is pressed against a drive pulley 137, and the drive pulley 1 is moved by a so-called oscillation effect.
37, and is pressed against the reel stand 66 of the one take-up reel or the reel stand 76 of the supply reel. As a result, the rotation of the drive pulley 137 is
36 to the reel stand 66 or reel stand 76, and fast forward or rewind is performed.

Next, when the stop mode is selected, mode plate 1
moves from the position shown in FIG. 5 to the position shown in FIG.

When the mode plate 1 is in the position shown in FIG. 5, the pin 82 of the slider arm 81 is not fitted into the groove cam 84 of the mode plate 1. The slider arm 81 is therefore in a position rotated clockwise about the pin 4. On the other hand, the other end of the slider arm 81 is provided with a pin 83 that fits into a long hole 85 of the slider (brake slider) 77. Therefore, at this time, the slider 77 is pressed downward, its end 78 presses the pin 75, and the brake arm 71 as a brake means resists the biasing force of the spring 73 and moves the supply reel around the fulcrum 72. The five windings are rotated clockwise on the side of the stand 76, and counterclockwise on the side of the reel stand 66. As a result, the end 74 of the brake arm 71 to which the felt or the like is fixed is separated from the reel stand 66, 76, and the brake is released.

When the mode plate 1 moves to the position shown in FIG.
Since the pin 82 fits into the grooved cam 84, the spring 79
The biasing force causes the slider arm 81 to rotate counterclockwise about the pin 4 by the amount of the grooved cam 84. As a result, the slider 77 is moved upward.

As the end portion 78 moves away from the pin 75, the brake arm 71 moves to the fulcrum 7 due to the biasing force of the spring 73.
2 in the counterclockwise or clockwise direction, the end portion 74 is pressed against the reel stand 66, 76, and the brake is applied (FIG. 6).

When the stop mode is switched to the forward mode (forward playback or recording mode) in which the magnetic tape 38 runs in the forward (FWD) direction, the mode plate 1 moves from the position shown in FIG. 7 to the position shown in FIG. will be moved up to When the mode plate 1 moves to the position shown in FIG. Rotate clockwise and push down the slider 77. As a result, the brake arm 71 rotates against the biasing force of the spring 73, and the brake is released (FIG. 8).

On the other hand, as the mode blade 1 moves to the left, the pin 93 of the rotary lever 94 moves to the recessed cam 1 of the mode plate 1.
26 to the inclined cam 92.

Since the inclined cam 92 presses the pin 93, the one-turn lever 9
4 rotates clockwise about the fulcrum 95 against the biasing force of the spring 67. Therefore, the end part is the rotating lever 94.
The lever 96 (connection plate A) coupled to moves to the right in the figure. Since the elongated hole 103 of the lever 96 is parallel to this direction of movement, the movement of the lever 96 is not directly transmitted to the pin 104 of the pinch arm 105 fitted in the elongated hole 103. However, when the lever 96 moves, the lever 98 (connection plate B) is pulled to the right in the figure via the spring 97. Lever 9
A pin 99 implanted in the chassis 5 is fitted into the elongated hole 101 of 8 to guide the movement of the lever 98. Since the elongated hole 102 of the lever 98 is formed substantially perpendicular to this direction of movement, its left edge presses the pin 104. As a result, lever 96.98. The spring 97° pin 104 moves rightward almost integrally, and eventually the pinch arm 105 is rotated counterclockwise about the fulcrum 106. Therefore, the pinch roller 107 gradually moves toward the capstan 108.

As the pin 93 approaches the final portion of the inclined cam 92 from the first portion, the pinch roller 107 abuts the capstan 108 . Therefore, the pinch arm 105 (pin 104) and the lever 98 stop there and do not move any further, but the mode plate 1 is driven slightly further to the left. At this time, the pin 104 remains in its position within the elongated hole 103.

The rotation lever 94 and lever 96 further move to the right,
Further expand the spring 97. As a result, the pinch roller 107 is pressed against the magnetic tape 3 by the biasing force of the spring 97.
8 and is crimped onto the capstan 108.

When the mode plate 1 further moves and the pin 93 moves further from the inclined cam 92 to the flat portion, the one-turn lever 94 does not rotate any further and stops there (FIG. 8). Therefore, if the capstan 108 is rotated in the forward direction in this state, the magnetic tape 38 can be run in the forward direction.

Since the pinch arm 105 is not directly driven by Lz/(-96, the pin 104 of the pinch arm 105 does not necessarily have to fit into the long hole 103 of the lever 96. However, when the pin 104 is fitted into the long hole 103 Otherwise, when the lever 96 moves to the right, its position may move upward in the figure and come into contact with the fulcrum 106.

Therefore, as in the embodiment, the pin 104 is fitted into the elongated hole 103,
It is preferable to restrict fluctuations in the vertical position of the lever 96.

As is clear from the timing chart in FIG. 12, the pinch arm 105 is driven gradually from just before the loading mode, and is finally driven to a position where the pinch roller 107 contacts the capstan 108 in the forward mode. be done.

When the mode plate 1 reaches the position shown in FIG. 9, the pin 51 fits into the recessed cam 111. Therefore, drive arm 4
5 rotates slightly counterclockwise about the fulcrum 46 by the amount of the four-part cam 111. On the other hand, pin 1 of band arm 47
16 fits into the groove cam 117 of the mode plate 1. As a result, the band arm 47 rotates slightly clockwise about the fulcrum 115 by the amount of the grooved cam 117 due to the biasing force of the spring 48, and a A tension regulator (TR) band 112 supported at both ends and wrapped around the reel stand 76 applies a brake to the reel stand 76 in accordance with the tension of the magnetic tape 38 (the position of the tension regulator arm 53). The so-called tension regulation effect is activated (FIG. 8).

When the forward mode is switched to the reverse mode (reverse recording or reproducing mode), the mode plate 1 moves from the position shown in FIG. 9 to the position shown in FIG. 11. When the mode plate 1 moves to the position shown in FIG. The reverse brake arm 121 rotates counterclockwise about the fulcrum 123, and the end 122 to which the felt or the like is fixed comes into contact with the reel stand 66 (FIG. 10).
. As a result, it is supplied from a take-up reel and wound onto a supply reel. Appropriate pack tension is applied to the magnetic tape 38 running in the opposite direction.

Further, when the mode plate 1 moves from the position shown in FIG. 9 to the position shown in FIG. Tension regulator arm 5
3 rotates slightly counterclockwise. Furthermore, since the pin 116 separates from the grooved cam 117, the band arm 47 rotates counterclockwise about the fulcrum 115. Therefore, the band 112 becomes loose and the tension regulation function becomes inoperative (FIG. 10).

Furthermore, the mode plate 1 is moved from the position shown in FIG.
When moving to the position shown in the figure, the pin 82 of the slider arm 81 once fits into the groove cam 131 of the mode plate 1, and then separates again. As a result, the slider 77 once moves upward and then returns downward again. The slider 77 is provided with a fulcrum 132 of the connecting member 133.
A rotary shaft 135 of an idler 136 is fitted into a long hole 134 at the tip of the idler 3 . Therefore, once the slider 77 moves upward, the idler 136 is centered, and when the rotation direction of the drive pulley 137 is switched from the forward direction to the reverse direction, the reel stand 66 of the idler 136
Swinging from to the reel stand 76 is ensured.

Although the case where the mode plate is sequentially moved to the left has been described above as an example, it goes without saying that when moving the mode plate to the right, operations corresponding to the positions are similarly performed.

The timing of each mechanism when the mode plate 1 explained above is moved left and right is illustrated in FIG. 12. Further, a block diagram showing how force is transmitted from the mode motor to each mechanism is shown in FIG. 13.

〔effect〕

As described above, the present invention provides a magnetic recording and reproducing device that loads a magnetic tape pulled out from a cassette onto a drum and records and reproduces information using a 5-rotation head. an arm that has a drawer part for pulling out the magnetic tape and is rotatable about a predetermined fulcrum; a pinch arm that has a pinch roller and is rotatable about a predetermined fulcrum, and the magnetic tape is wound around the arm; It is equipped with a reel stand that drives the reel of the cassette, and a brake means that applies a brake to the reel stand. Since at least the arm, pinch arm, and brake means are driven, the number of parts can be reduced, work efficiency during assembly can be improved, and costs can be reduced. Furthermore, it becomes possible to downsize the device.

[Brief explanation of drawings]

FIG. 1 is a plan view of the magnetic recording and reproducing apparatus of the present invention in eject mode, FIG. 2 is a plan view when transitioning from the eject mode to the loading mode, and FIG. 3 is a plan view in the loading mode. , FIG. 4 is a plan view when shifting from the loading mode to the fast forward or rewind mode, FIG. 5 is a plan view during the fast forward or rewind mode, and FIG. 6 is a plan view during the fast forward or rewind mode. FIG. 7 is a plan view of the stop mode, and FIG. 8 is a plan view of the stop mode transitioning from the stop mode to the forward mode. Fig. 9 is a plan view in the forward mode, Fig. 10 is a plan view when transitioning from the forward mode to the reverse mode, Fig. 11 is a plan view in the reverse mode, and Fig. 12 is the timing. Chart, 13th
The figure is a block diagram showing the transmission of that force. 1...Mode plate 8...Deceleration mechanism 9...
Encoder 13...Release drive arm 17...Release arm 24...Connection arm 27...Slide plate 34...Drawer arm 45...Tension regulator drive arm 47...
・Band arm 53...Tension regulator arm 64...Threading brake arm 71...Brake arm 77...Slider 81...Slider arm 94...Rotating lever 96.98...Lever 105... ... Pinch arm 112 ... Tension regulator band 121 ...
・More than reverse brake arm

Claims (1)

[Claims] A magnetic recording and reproducing device that loads a magnetic tape pulled out from a cassette onto a drum and records and reproduces information using a rotating head, comprising: a mode plate movable with respect to a chassis; and a mode plate formed on the mode plate. A cam, an arm having a pull-out portion for pulling out the magnetic tape and rotatable around a predetermined fulcrum, a pinch arm having a pinch roller and rotatable around a predetermined fulcrum, and the magnetic tape. a reel stand for driving the reel of the cassette wound with the reel, and a brake means for applying a brake to the reel stand, the mode plate is moved to a predetermined position in accordance with the operation mode, and the mode plate is 1. A magnetic recording and reproducing device characterized in that at least the arm, the pinch arm, and the brake means are driven by the cam as the arm moves.