JPH0654575B2 - Recording or playback device - Google Patents

Description

Description: TECHNICAL FIELD The present invention interlocks with the movement of a loading means for loading a band-shaped record carrier, and sets the record carrier guiding means to a predetermined first position.
And a recording or reproducing apparatus having a loading mechanism for moving between the second positions.

(Background Art) For example, according to an auto-loading mechanism in a VTR, when a loading ring rotates in the direction of the loading ring, the tape is pulled out by a loading post or a tape guide member located on the back surface of the tape in the cassette, and the tape is wound around a rotating drum. Further, the tape is laid over the fixed tape guide member, and the tape is brought into contact with the recording or reproducing head to complete the loading, thereby recording or reproducing.

Then, at the time of loading, the loading ring is rotated in the unloading direction at a predetermined rotation speed,
In the meantime, the tape wound around the loading post and the tape guide member is wound by a reel that can be rotated at a predetermined rotation speed. Here, when the tape guide member largely moves near the end of unloading, the reel is rotated at a predetermined rotation speed, and therefore the tape to be wound more than the amount of tape that can be wound on the reel. Therefore, the unwound portion of the tape exists in a slack state, which causes damage to the tape, failure of the loading mechanism, and the like.

In order to eliminate such a point, a torque limiter mechanism is provided on the reel to increase the rotational speed of the reel to wind the tape while slipping, that is, to increase the amount of tape that can be wound on the reel. Alternatively, it has been proposed that the applied voltage of the loading drive motor is lowered and the rotation speed thereof is reduced to perform unloading to prevent abnormal tension from being applied to the tape. It is complicated, and particularly in the latter case, there is a drawback that the time required for unloading becomes long.

Further, even at the time of loading, if the tape guide member is largely moved at the initial stage of loading, an excessive tension may be applied to the tape. In particular, the reel is in a stopped state at the beginning of loading, and if the tape is pulled suddenly in this state, a large load is applied to the tape due to the mass of the reel and the tape roll wound around the reel. The tension applied will be quite high, thus leading to undesired situations such as elongation of the tape.

In order to eliminate such a defect, the rotation of the loading ring should be slowed down to perform the loading, but in this case, another disadvantage that the time required for the loading becomes long occurs.

(Purpose) The present invention solves the above-mentioned drawbacks of the prior art. Even when the record carrier guiding means interlocking with the loading means makes a great movement during unloading and loading, the safety of the record carrier is improved. It is an object of the present invention to provide a recording or reproducing apparatus having a configuration that is high and that can reduce the time required for unloading or loading.

(Examples) Hereinafter, means taken in the present invention to achieve the above-mentioned object will be illustrated and described with reference to the drawings.

1 to 5 show an embodiment of a recording or reproducing apparatus according to the present invention. FIG. 1 shows a state at the start of unloading or completion of loading, and FIG. 2 shows a state of near unloading or loading. FIG. 3 shows the state immediately after the start, FIG. 3 shows the state at the end of unloading or the start of loading, and FIG. 4 shows the vertical relationship of each lever in this embodiment. ) And (c) show respective control circuits for the motors in the first, second and third embodiments of the present invention.

In FIG. 1, reference numeral 1 denotes a cassette that acts as a recording carrier storage container that stores a tape 21 that is a band-shaped recording carrier, and the tape 21 is wound around a supply reel 22 and a take-up reel 23 that are winding means. Reference numeral 2 is a loading ring which constitutes a part of loading means together with loading posts 17, 18 and 20 which will be described later, and has a cam 2a on a peripheral surface thereof in a predetermined angular range and a projection 2 in a predetermined position.
It is located around the rotary drum 13 which is a recording / reproducing means having a recording / reproducing magnetic head (not shown).
Reference numeral 3 denotes a motor which acts as a drive source for a loading means for driving the loading ring 2, and a gear 3a pivotally mounted on the motor 3 and a gear provided on the outer peripheral side surface of the loading ring 2a mesh with each other. The ring 2 is rotated by a motor 3 in the loading direction and the unloading direction. Reference numeral 4 denotes a switch for detecting a predetermined rotation range of the loading ring 2, and a rotation range between the positions of the loading ring 2 shown in FIGS. 2 and 3, that is, a movable tape guide 5, which will be described later.
6 engages with the cam 2a in the rotation range of the loading ring 2 which moves in association with the loading ring to generate a detection signal, which is input to the control circuit 24 which controls the speed of the motor 3. The control circuit 24, to which the detection signal is input, lowers the voltage applied to the motor 3 and lowers its rotation speed. 7 is an erasing head for erasing all the signals recorded on the tape 21.
Is a fixed head for recording / reproducing an audio signal, a CTL signal, a cue signal, or the like. Reference numerals 8, 9 and 11 are fixed tape guides, and reference numerals 5 and 6 are tapes that move between the positions shown in FIGS. 1 and 2 and the position shown in FIG. 3 in association with the rotation of the loading ring 2. Movable tape guides 14, 15 and 16 which act as a guide means for guiding the tape are moved by the rotation of the loading ring 2 between the position shown in FIG. 1 and the position shown in FIG. Transfer posts for use, 17, 19 and 20 are loading rings 2
The loading post, which moves between the position shown in FIG. 1 and the position shown in FIG.

Reference numeral 12 is a capstan, and 19 is a pinch roller that moves together with the loading post 20.

Reference numeral 25 is an L-shaped lever having the movable tape guide 5 erected at its tip, 26 is a rotation center axis of the lever 25, 27
Is a pin which is planted on the lever 25 and which comes into contact with the protrusion 2b provided on the outer periphery of the loading ring 2, 31
Is a lever with a movable tape guide 6 installed at its tip,
33 is the central axis of rotation thereof. Lever 25 and lever 31
Are rotatably connected by pins 28 and 32 at both ends of the intermediate lever 29. The intermediate lever 29 is moved to the right by the spring 30 mounted between the pin 36 set up on the chassis 34 and the pin 25 set up on the intermediate lever 29, that is, the levers 25 and 31 are moved to the left and right. It is urged to open.

In this configuration, in the loading completion state (state shown in FIG. 1), the tape 21 is fixed tape guides 8, 9, 11, moving posts 14, 15, 16, loading posts 17, 18, 20, movable tape guide 5. , 6
Is hung on the rotating drum 13. In this state, the full width erasing head 7 and the fixed head 10 are in contact with the tape 21. Then, when unloading is started by the unloading command signal in this state, the motor 3 rotates clockwise at a predetermined rotation speed under the control of the control circuit 24 to rotate the loading ring 2 counterclockwise. . As the loading ring 2 rotates counterclockwise, the loading posts 17, 18, 20, the pinch roller 19, and the moving post 1
4, 15 and 16 and the movable tape guides 5 and 6 start moving toward their original positions. As a result, the tape path over which the tape 21 is stretched becomes shorter, and the excess tape 21 is rotated by the reel driving member (not shown) provided below the cassette 1 and the winding reel 22 and / or the winding reel 21 are wound. It is wound around the reel 23.

From the unloading start state shown in FIG. 1 to the state near the unloading completion shown in FIG. 2, the movable tape guides 5, 6, the moving posts 14, 15, 16 and the loading posts 17, 18, 20 are hooked. Since the change in the tape length of the delivered tape 21 depends exclusively on the movement of the loading posts 17 and 18 that move in a one-to-one relationship with the loading ring 2, the supply reel changes with respect to the change amount of the tape length at this time. 22 and / or take-up reel 2
By setting the tape winding amount by 3 to be slightly large, that is, by setting the rotation speed of a reel driving motor (not shown) to be slightly higher, the tape 21 does not sag and the supply reel 22 or the take-up reel Get caught in 23.

However, since the movable tape guides 5 and 6 having a large movement amount move from the position near the unloading completion shown in FIG. 2 to the unloading completion shown in FIG. 3, the movable tape guide 5 is moved. Since the change in the tape length of the tape 21 wound around the tapes 6 and 6 is larger than before, if the loading ring 2 is rotated at a predetermined rotation speed by the motor 3, the tape 21 will be left unwound. Slack will occur.

Therefore, in the first embodiment of the present invention, the loading ring 2 is moved to the position shown in FIG. 2, that is, the position where the movable tape guides 5 and 6 start moving in the direction of the cassette 1 by the configuration of the control circuit 24 described later. The arrival of the cam 2a that moves with the loading ring 2 is detected by the rotation range detection switch 4, and the detection signal is added to the control circuit 24. As a result, the control circuit 24 lowers the voltage applied to the motor 3, lowers the rotation speed thereof, and lowers the rotation speed of the loading ring 2 until the completion of unloading shown in FIG.

Then, the protrusion 2 of the loading ring 2 rotating at a low speed
As shown in FIG. 2, b abuts on a pin 27 of an L-shaped lever 25 on which the movable tape guide 5 is erected, and moves the lever 25 through the pin 27 around the rotation center axis 26 thereof. The movable tape guide 5 is moved in the direction of the cassette 1 while being rotated in the direction, and the opening angle thereof is gradually reduced. As a result, the intermediate lever 29 is moved leftward against the tension of the spring 30 mounted between the pin 36 that is erected on the chassis 34 and the pin 35 that is erected on the intermediate lever 29. Then, the lever 31 on which the movable tape guide 6 is erected is rotated counterclockwise about the rotation center shaft 33 as a center of rotation to move the lever 31.
Is gradually moved toward the cassette 1.

As described above, in the first embodiment of the present invention, normally, the movable tape guides 5 and 6 move toward the cassette 1, so that the supply reel 22 and / or the take-up reel 23.
When the length of the tape to be wound on the movable tape guide becomes longer than before, the moving speed of the movable tape guides 5 and 6 is decreased by decreasing the rotation speed of the loading ring 2 as described above, and the movable tape guide is moved. The rate of change in the length of the tape 21 to be wound around the tapes 5 and 6 per unit time can be reduced, so that the tape 21 is not sagged on the supply reel 22 and / or the take-up reel 23. It will be surely wound up.

The loading ring 2 continues to rotate at a reduced rotation speed until the unloading completion shown in FIG. 3 is reached, and during this time, the tape 21 is wound around the supply reel 22 and / or the take-up reel 23 and is movable. The tape guides 5 and 6 are housed in the cassette 1 following the loading posts 17, 18 and 20, the pinch roller 19, and the moving posts 14, 15 and 16. The position of the loading ring 2 upon completion of unloading is detected by another detection device (not shown), and the control circuit 2 is detected by the detection signal.
When the unloading command signal applied to No. 4 is cut off, the control circuit 24 stops the power supply to the motor 3 and stops the rotation of the motor 3.

By the way, in the case of the loading mechanism as described above, considering the operation at the time of tape loading, the movable tape guides 5 and 6 largely move at the initial stage of tape loading, and in this state, the supply reel 22 and the take-up reel 23. Is stopped, the reel 22,
Since 23 and the mass of the tape roll wound around these are applied as a load to the tape 21 to be drawn out, a large tension is suddenly applied to the tape 21 and the tape 21 is unfavorably influenced such as stretching. I'm afraid to give.

Therefore, in the second embodiment of the present invention, when the tape is loaded by the configuration of the control circuit 24 described later, the loading ring 2 moves from the loading start position shown in FIG. 3 to the movable tape guides 5, 6 shown in FIG. The rotation range of the loading ring 2 until it is moved to the position is detected by the rotation range detection switch 4 via the cam 2a, and the motor 3 is decelerated in the rotation range to reduce the rotation speed of the ring 2. There is.

That is, under the control of the control circuit 24 by the loading command signal in the unloading completed state shown in FIG.
When the motor 3 is rotated counterclockwise, the loading ring 2 is rotated clockwise, and at this time, the protrusion 2b moves in the same direction, so that the L-shaped lever 25 is mounted on the intermediate lever 29. By the acting force of the spring 30
Following this, the lever 31 rotates counterclockwise, and the intermediate lever 29 is moved to the right accordingly, so that the lever 31 rotates clockwise, and therefore the movable tape guides 5, 5.
6 will pull out the tape 21 from the cassette 1,
Here, the loading ring 2 rotates from the position shown in FIG. 3 to the position shown in FIG.
The rotation of the loading ring 2 is performed at a low speed until is reached a predetermined position. Therefore, this allows the movable tape guides 5 and 6 to be pulled out from the cassette 1 without applying a sudden and excessive tension to the tape 21.

After the position shown in FIG. 2, the rotation range detection switch 4
Since the cam 2b is separated from the control circuit 24, the control circuit 24 speeds up the motor 3 more than before, so that the loading ring 2 rotates at the increased rotation speed toward the loading ring completion position shown in FIG. When the loading command signal is cut off at the position shown in FIG.
Stops the motor 3.

Thus, according to the second embodiment, the loading ring 2 is moved from the position shown in FIG.
Since the motor 3 and hence the loading ring 2 are decelerated up to the position shown in the figure, the tape withdrawing speed by the movable tape guides 5 and 6 is low at the time of tape loading, and therefore, the tape 21 is given excessive tension. There is no effect.

Further, as a third embodiment of the present invention, by the configuration of a control circuit 24 described later, a combination of the first and second embodiments described above is shown in FIG. 2 upon both unloading and loading of the tape 21. The rotation of the loading ring 2 can be reduced in the range between the position and the position shown in FIG. 3, and in this case, the effects of both the first and second embodiments can be obtained. .

5 (a), (b) and (c) show specific examples of the control circuit 24 in the above-described first, second and third embodiments of the present invention.

In Fig. 5 (a), (b), (c), Tra, Trb, Trc and Tr
d is a transistor that switches and cuts off the drive current of the motor 3, and Tre and Trf are transistors of a circuit that performs deceleration operation. D _a , D _b and D _{1 to} D ₃ are diodes, and the diodes D _{1 to} D ₃ are for obtaining the base potential of the transistor Tre. AG is an AND gate, and OG shown in FIG. 5 (c) is an OR gate. In addition,
The rotation range detection switch 4 is a normally open type switch which is turned on by the cam 2a of the loading ring 2 and is connected to the resistor R, and the potential at the connection point c between them is one input of the AND gate AG. Given to. In addition, the bases of the transistors Tra and Trd, Trb and Trc, which are in the opposing relationship among the transistors Tra to Trd, are commonly connected, and the bases of the transistors Tra and Trd are connected to the terminal a to which the loading command signal is applied and the transistor Tr.
The bases of b and Trc are respectively connected to terminals b to which an unloading command is given. Also, the transistor Tr
When f is turned on, f is connected so as to short-circuit both ends of the diodes D ₁ and D ₂ , and its base is connected to the output of the AND gate AG.

(i) First Embodiment (FIG. 5 (a)) A specific example of the control circuit 24 in the first embodiment of the present invention is shown. In the configuration shown in FIG. 5 (a), AND gate A
The other input terminal of G is connected to the unloading command signal input terminal b.

In this configuration, when a loading command signal (high level signal) is applied to the loading command signal input terminal a during loading, the transistors Trab and Trc remain off and the transistors Tra and Trd turn on. A current flows in the L direction, and the motor 3 rotates in the loading direction for loading. In this case, the transistor Trf is off because the output of the AND gate AG is at the low level regardless of whether the rotation range detection switch 4 is on or off, and therefore the base potential of the transistor Tre is combined by the diodes D _{1 to} D ₃ . A potential and a relatively large current flows through the transistor Tre, whereby the motor 3 rotates at a relatively high speed.

Next, when an unloading command signal input terminal and an unloading command signal (high level signal) are applied during unloading, the transistors Tra and Trd
Is turned off, the transistors Trb and Trc are turned on, a current flows in the motor 3 in the direction indicated by the arrow U, and the motor 3 rotates in the unloading direction to perform unloading. Here, since the output of the AND gate AG is at the low level until the rotation range detection switch 4 is turned on, the transistor Trf is off, so that the motor 3 rotates at a relatively high speed as described above. However,
When the rotation range detection switch 4 is turned on by the cam 2a of the loading ring 2, the output of the AND gate AG becomes high level, the transistor Trf is turned on, and the both ends of the diodes D ₁ and D ₂ are short-circuited. Therefore, the base potential of the transistor Tre becomes a potential only by the diode D ₃ , that is, the potential becomes lower than that before, and the current flowing through the transistor Tre becomes small, so that the motor 3 is decelerated.

(ii) Second Embodiment (FIG. 5 (b)) In the configuration of FIG. 5 (b) showing a concrete example of the control circuit 24 in the second embodiment of the present invention, the other input terminal of the AND gate AG Is connected to the loading command signal input terminal a.

Therefore, as can be understood from the above description, FIG.
In the above configuration, the motor 3 can be loaded only when the detection switch 4 is turned on by the cam 2a during loading.
Will be slowed down.

(iii) Third Embodiment (FIG. 5 (c)) In the configuration of FIG. 5 (c) showing a concrete example of the control circuit 24 in the third embodiment of the present invention, a loading command signal and an unloading command signal are used. OR gate OG input with
Of the AND gate AG is connected to the other input terminal of the AND gate AG.

Therefore, in the configuration of FIG. 5 (c), the motor 3 is decelerated while the detection switch 4 is turned on by the cam 2a in both loading and unloading.

(Effects) As described above, according to the present invention, even when the record carrier guide means interlocking with the loading means makes a large movement at the time of unloading or loading, the safety of the record carrier is enhanced and the unloading and the loading are performed. It is possible to provide a recording or reproducing apparatus having a configuration that shortens the time required.

[Brief description of drawings]

1 to 5 show an embodiment of the recording or reproducing apparatus of the present invention, FIG. 1 is a plan view showing the state at the start of unloading or at the completion of loading, and FIG. 2 is near the completion of unloading. FIG. 4 is a plan view showing a state immediately after the start of loading, FIG. 3 is a plan view showing a state at the completion of unloading or at the start of loading, and FIG. FIG. 5 (a) is a side view showing the vertical relationship of the levers, FIG. 5 (a) is a motor control circuit diagram used in the first embodiment of the present invention, and FIG. 5 (b).
Is a motor control circuit diagram used in the second embodiment, FIG.
(c) is a motor control circuit diagram used in the third embodiment. In the figure, 1 is a cassette, 2 is a loading ring, 2a is a cam, 2b is a protrusion, 3 is a motor for driving the loading ring, 4 is a rotation range detection switch, 5 and 6 are movable tape guides, and 14, 15 and 16 are Mobile post, 17, 18,
20 is a loading post, 19 is a pinch roller, 8,
Reference numerals 9 and 11 are fixed tape guides, 12 is a capstan, 13 is a rotating drum, 7 is a full-width erasing head, 10 is a recording / reproducing fixed head, 21 is a tape, 22 is a supply reel, and 23 is a take-up reel. , 24 is a control circuit, 25 is L
L-shaped lever, 26 is a central axis of rotation of the lever 25, 27 is a pin, 29 is an intermediate lever, and 28 and 32 are levers 25 and 31.
Pin that rotatably connects the intermediate lever 29 to the intermediate lever 29,
Reference numeral 1 is a lever, 33 is a rotation center axis of a lever 31, 34 is a chassis, 36 is a pin erected on the chassis, 35 is a pin erected on an intermediate lever 29, 30 is a spring, AG is an AND gate, and OG is Indicates an OR gate.

Claims (1)

[Claims] 1. A recording or reproducing apparatus for loading and using a cassette containing a tape wound around a pair of reels, for pulling out the tape from the cassette and loading the tape onto a recording or reproducing means. And a guide member that moves from a first predetermined position to a second predetermined position in conjunction with the movement of the loading member and guides the tape pulled out at the second predetermined position. Driving means for driving the loading member, and when the guide member is moved from the second predetermined position toward the first predetermined position during the movement of the loading member in the unloading direction. , The moving speed of the loading member is reduced without changing the winding speed of the tape, When the guide member is moved from the first predetermined position toward the second predetermined position by moving in the swinging direction, the loading member is driven without driving the reel around which the tape is wound. And a control means for making the moving speed of the device substantially the same as the reduced moving speed.