JPH033291B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotary head type reproducing apparatus, and more particularly to an improvement of a reel drive mechanism of a rotary head type reproducing apparatus equipped with a high-speed search function.

In a magnetic recording and reproducing device that has a high-speed search function, that is, an operation mode in which the tape is run at high speed in the tape loading state to obtain a reproduced image (hereinafter referred to as search mode), the search mode is different from the normal playback mode. Sometimes it is necessary to run the tape at high speed. For this reason, conventional devices of this type run the tape at high speed by driving the tape reel using a tape fast forwarding mechanism or fast rewinding mechanism, but in this case, the tape running speed is varies depending on the amount of tape wound on the reel, and is not run at a constant speed. Therefore, it is necessary to change the rotation speed of the rotary head in response to changes in the tape running speed, resulting in a disadvantage that the control circuit for the rotary head becomes complicated. In order to solve this drawback, a device has been proposed and put into practical use that rotates the capstan at high speed by changing the rotational speed of the DC motor that drives the capstan during the search mode, thereby running the tape at a constant speed. However, when the tape is run at a constant speed in the search mode, the configuration of the reel drive mechanism becomes complicated.

The present invention was made in view of the above background, and in a loading state in which a tape-shaped recording medium is attached to the periphery of a tape guide drum having a rotating head, the medium is transported at the same speed as when recording. a search mode in which the medium is conveyed at high speed while reproducing the signal in the loading state; and a search mode in which the medium is not attached to the drum in the unloading state. The apparatus includes a loading mechanism for setting the tape-shaped recording medium in the loading state and the unloading state, and detecting the tape loading state of the loading mechanism. a detection means, a capstan and a pinch roller for conveying the tape-shaped recording medium, a capstan motor for driving the capstan, and a power transmission mechanism for transmitting the driving force of the capstan motor to a reel stand. and a sliding torque transmission member disposed between the capstan motor and the reel stand, and according to the detection by the detection means, when the tape-shaped recording medium is in the loading state, the capstan The pinch roller is brought into pressure contact with the medium sandwiched therebetween, and the driving force of the capstan motor is transmitted to the reel stand via the sliding torque transmission member, and when the tape-shaped recording medium is in the unloading state. The capstan and the pinch roller are separated from each other, and the driving force of the capstan motor is transmitted to the reel stand without going through the sliding torque transmission member.

Embodiments of the present invention will be described in detail below with reference to the drawings. 1 and 2 show an overview of a magnetic recording and reproducing apparatus according to an embodiment of the present invention, and FIG. 1 shows the state before tape loading;
FIG. 2 shows the state after tape loading is completed. The tape loading method employed in this device is basically the so-called "M loading method." In FIG. 1, reference numeral 2 denotes a tape cassette, which is attached to a supply reel stand 12 as shown by a cassette mounting device (not shown).
The rotating shafts of the reel stands 12 and 13 are fitted into center holes of a supply reel and a take-up reel (not shown), which are arranged on the take-up reel stand 13 and arranged in parallel inside the cassette 2, respectively. Although not shown in the drawings, the front wall of the cassette 2 is provided with an opening for drawing out the tape.
A magnetic tape is placed so as to face this opening, and at a predetermined position on the bottom surface of the casing.
A notch is formed into which tape drawing means such as tape drawing members 3 and 4, which will be described later, is inserted. Since the structure of such a tape cassette 2 is well known, it will not be described in detail here.

When the cassette 2 is installed in the predetermined position shown in FIG. 1, the tape pull-out members 3, 4, the pinch roller 5, and the tape pull-out pin 35a are fitted and arranged inside the tape facing the opening of the cassette 2. be done. The tape drawing member 4 and the pinch roller 5 are rotatably provided on the loading ring 7, and the tape drawing member 3 is rotatably provided on the loading ring 8. Also,
The tape pull-out pin 35a is provided on the tape pull-out arm 35. The loading rings 7 and 8 are stacked around the tape guide drum 36 and rotated reciprocally by the loading motor 9. That is, a gear portion is formed around the loading rings 7 and 8, and each gear portion has gears 10 and 11.
are meshing. And these gears 10, 11
are also in mesh, and the rotation of the motor 9 is transmitted to the gear 11. Therefore, the loading rings 7 and 8 are always rotated in opposite directions by the rotation of the loading motor 9. When loading the tape, the loading ring 7 is rotated in the direction of arrow B, and the loading ring 8 is rotated in the direction of arrow C. In conjunction with the rotation of the loading rings 7 and 8, the tape pull-out members 4 and 3 are moved along a predetermined path by guide means (not shown), and the tape 39 is transferred to the cassette 2.
It is pulled out from inside and attached to the periphery of the tape guide drum 36 within a predetermined angular range of about 180 degrees. Note that a rotary head (not shown) is built inside the tape guide drum 36. This rotary head is for recording video signals on a tape attached around the guide drum 36 or for reproducing video signals recorded on the tape. The pinch roller 5 is rotatably provided on a pinch roller arm 5a that is pivotally supported 5b on the loading ring 7, and is rotated in conjunction with the rotation of the loading ring 7 in the direction of arrow B. The tape 39 is moved along a predetermined path regulated by the illustrated guide means, and brought into contact with the audio and control head 37 shown in FIG. 2, and positioned near the capstan 6 at the end of loading. do. Then, the tape 39 is pinched and pressed against the capstan 6 by the pinch roller solenoid 38 which is activated upon detection of the completion of loading, and the tape 39 is caused to travel. In conjunction with the operation of the pinch roller solenoid 38, the take-up idler 28, which is belt-driven by the rotary shaft 19 of the capstan motor 18, is brought into pressure contact with the take-up reel stand 13. The rotation of the motor 18 is transmitted to rotate the take-up reel stand 13.

The rotation of the motor 18 is also supplied to the flywheel 6a of the capstan 6 via a belt 6b for driving the capstan, which is hung around the rotating shaft 19, as shown in FIG.
It is becoming more and more like driving. The rotating shaft 19 of the motor 18 has a small diameter portion 19a with respect to the belt 6b.
and a large-diameter portion 19b are provided, and are configured to be replaceable by a belt replacement solenoid 522. That is, under normal conditions, the belt 6b is placed around the small diameter portion 19a of the rotating shaft 19, and the capstan 6 is driven at a rotational speed that transports the tape 39 at a normal running speed. However, when the solenoid 522 is driven, the belt 6b is displaced upward by the actuator 523 that slides upward in the drawing due to the operation of the solenoid 522, and the belt 6b is moved around the large diameter portion 19b of the rotating shaft 19. It is said to be in a hung state. In this case, the capstan 6 is driven at a high rotational speed that transports the tape 39 at the traveling speed in the search mode.

The tape pull-out arm 35 is rotatably supported by a shaft 35b on the base plate 1, and moves to the tape guide position shown in FIG. is brought into pressure contact with the full-width erasing head 40, and in conjunction with a back tension control mechanism (not shown), the supply reel stand 1
2, and a predetermined back tension is applied to the tape 39.

Additionally, on the loading ring 7,
Operating protrusions 7a and 7b are formed. These protrusions 7a and 7b are used to operate a loading completion detection switch 100 and an unloading completion detection switch 101, respectively, when the loading ring 7 has rotated to the loading completion position (the state shown in FIG. 2). ), and when the unloading end position is reached (the state shown in Figure 1), the switch 100 or 10 is turned off.
1 is pressed with protrusions 7a and 7b to turn it on.

In the above apparatus, the reel stand 12 or 13 is driven during tape fast forwarding by pressing the idler 14 embedded in the substrate 1 against the reel stand 12 or 13 on the winding side during fast forwarding. The idler 14 is connected to an idler stand 15, as shown in detail in FIGS. 3 and 4.
It is fixed to the upper end of an idler shaft 20 which is rotatably fitted into the idler shaft 20. An intermediate ring 26 is fixed to the idler shaft 20 at the position shown in FIG. A sliding member 25 such as felt is adhesively fixed to the inside of the lower surface of the ring 26.
On the outside thereof, there is an engaging protrusion 2 as shown in FIG.
6a is provided. A drive pulley 2 is provided at the bottom of the intermediate ring 26 of the idler shaft 20.
4 is fitted so as to be rotatable with respect to the shaft 20 and also slidable in the thrust direction. The drive pulley 24 is composed of a disc-shaped flange 24a and a cylindrical boss 24b, and a drive belt (not shown) is hung around the outer periphery of the flange 24a. is transmitted. For this reason,
A recess 24c for housing the drive belt is formed at the outer peripheral edge of the collar 24a. In addition, the flange 24a
A pair of through holes 24d and 24d' are formed at predetermined positions, and a clutch plate 23 is rotatably and slidably fitted to the outer periphery of the boss portion 24b. A pair of protrusions 23b and 23b' are loosely fitted into the through holes 24d and 24d' formed in the flange 24a of the drive pulley 24. Further, a protruding edge 23a is formed on the outer peripheral surface of this clutch plate 23, and this protruding edge 23a is clamped by a U-shaped clamping portion 27d of a clutch switching plate 27, which will be described later. In the loading completed state, it is held at the position shown in the figure. A stopper sleeve 21 is fixed to the lower end of the idler shaft 20, and a stopper sleeve 21 is connected to the boss 24b of the drive pulley 24.
Coil spring 2 inserted between the lower end of
2 urges the drive pulley 24 in the upper direction in FIG. 3, that is, in the direction of the intermediate ring 26. For this reason, the driving pulley 24 is always operated by the sliding member 2 provided on the lower surface of the intermediate ring 26.
5 is in a crimped state. Therefore, the third
In the state shown in the figure, the capstan motor 1
The rotation of the drive pulley 24 by the slide member 25 is transmitted to the idler shaft 20 to drive the idler 14.

The clutch switching plate 27 has the function of vertically sliding the clutch plate 23 with respect to the idler shaft 20, and as shown in FIG. , 27a'. Each of the mounting arms 27a, 27a' has a through hole formed therein, and as shown in FIG. , 1a' are rotatably mounted on the lower surface of the substrate 1 by commonly fitting the mounting pin 41 into the through holes. A portion of one end of the clutch switching plate 20 is cut and raised in an L-shape to form a holding portion 27d that has a U-shape when viewed from the side. And this clamping part 2
The protruding edge 23a of the clutch plate 23 is housed in 7d and slidably held therein. Clutch switching plate 27
The other end is raised toward the substrate 1 by a bent step 27e to form an actuating piece 27b, which is located below the loading ring 8. A stopper portion 27c having a tape surface is formed on one side of the operating piece 27b. Note that the clutch switching plate 27 is biased to rotate in the counterclockwise direction in FIG. . Further, as shown in FIG. 6, an operating protrusion 8a is formed at the lower part of the loading ring 8 at a position corresponding to the end of unloading. The protrusion 8a contacts and presses the operating piece 27b of the clutch switching plate 27, causing the clutch switching plate 27 to rotate clockwise in FIG. 3 against the biasing force of the spring.
By this clockwise rotation of the clutch switching plate 27, the clutch plate 23 whose protruding edge 23a is clamped by the clamping portion 27d rises, and the clutch plate 23 which is loosely fitted into the through holes 24d and 24d' of the drive pulley 24 is moved upward.
The protrusions 23b and 23b' engage with the engagement protrusion 26a formed on the intermediate ring 26, and the state is switched to a state in which the rotational driving force of the drive pulley 24 by the capstan motor 18 is directly transmitted to the intermediate ring 26. .

The idler stand 15 is rotatably supported by a shaft 16 implanted in the substrate 1, and a spring 1 attached to a pin 42 implanted in the substrate 1.
A protrusion 15 formed on the idler stand 15 by 7
The reel a is clamped and energized to the central position, and its position is normally regulated at approximately the center of both reel stands 12 and 13. A pair of arms 15b and 15c are formed on the idler stand 15 symmetrically with respect to the shaft 16, and these arm portions 15b and 15c are rotated by pressing the fast forward button 30a and fast rewind button 31a, respectively. It is arranged opposite to the ends of the sliding fast forward operating member 30 and fast rewind operating member 31. Therefore, in conjunction with the pressing operation of the fast-forward button 30a, the arm portion 15b is pressed, rotating the idler stand 15 clockwise and bringing the idler 14 into contact with the take-up reel stand 13. Similarly, the arm portion 15b is pressed in conjunction with the pressing operation of the fast rewind button 31a, and the idler base 15 is rotated counterclockwise.
The idler 14 is brought into contact with the supply reel stand 12.

In FIG. 1, reference numeral 32 denotes a sliding plate configured to slide to the left in the drawing in connection with the operations of the fast forward operation member 30 and the fast rewind operation member 31. By sliding to the left, the operating lever 33 whose one end is locked to the sliding plate 32 is rotated clockwise, and the displacement of the other end causes the take-up idler 28 to be moved from the take-up reel stand 13. Separate. Further, in conjunction with the operations of the fast forward operation member 30 and the fast rewind operation member 31, the switches 103 and 10 shown in FIG.
4 is in the ON state.

FIG. 7 shows the drive circuit for the loading motor 9 and the rotational speed switching circuit for the capstan 6 in the above-mentioned apparatus, and shows the unloading state. In the figure, 100 is the above-mentioned loading completion detection switch, 101 is the above-mentioned unloading completion detection switch, and 102 is the above-mentioned unloading completion detection switch.
A switch 103 is turned on when the fast forward button 30a is pressed, and a switch 104 is turned on when the fast rewind button 31a is pressed. These switches 100 to 104 are composed of normally open microswitches, and are in the ON state (i.e., conductive state) when pressed, and in the OFF state (i.e., non-conductive state) when not pressed. Become. And the above switch 1
One terminal of 00 to 104 is connected to the positive power supply V, and the other terminal is connected to the resistor R0 to ₁₀₄ , respectively.
It is grounded via R ₄ , and outputs P ₀ to P ₄ are taken out from the terminals on the grounded side via resistors R ₀ to R ₄ . Therefore, these outputs P ₀ to P ₄ are
When the switches 100 to 104 are in the ON state, that is, pressed, they are at a "high level," and when they are in the OFF state, that is, when they are not pressed, they are at a "low level." The loading motor 9 is a DC motor, and is rotationally driven by a drive control circuit 44. This drive control circuit 44 includes control terminals 44a and 44b. When the control signal supplied to the control terminal 44a is at a "high level", the control terminal 44b
When the control signal supplied to the control terminal 44a is at a "low level", a drive current is caused to flow in the direction of the arrow E to the loading motor 9, and the control signal supplied to the control terminal 44a is at a "low level" and is supplied to the control terminal 44b. Loading motor 9 when the signal is “high level”
A driving current is applied in the direction of arrow F to rotate the motor 9. That is, the drive control circuit 44 includes, for example, a pair of PNP transistors whose emitters are commonly connected as shown in the figure.
A pair of T ₁ , T ₂ and emitters connected in common
A bridge circuit is formed by NPN transistors T ₃ and T ₄ , and the connection point S between transistors T ₁ and T ₃ is
A loading motor 9 is connected between the transistors T ₂ and T ₄ and the connection point T between the transistors T 2 and T 4 . These transistors T ₁ to T ₄ are switched and controlled by a pair of control NPN transistors T ₅ and T ₆ . That is, the base of the transistor _T5 is connected to the control terminal 44a via a base resistor, and when the transistor _T5 is turned on, the transistors _T2 and _T3 are turned on. . The base of the transistor T ₆ is connected to the control terminal 44b via a base resistor, and when the transistor T ₆ is turned on, the transistors T ₁ and T ₄ are turned on. Since such a motor drive circuit is well known, a more detailed explanation of its configuration will be omitted.

The output of a NAND circuit 46 is supplied to the control terminal 44a via an inverter 45, and the output _P1 of the switch 101 and the output of the switch 101 are supplied to the NAND circuit 46 via inverters 47 and 48, respectively. An output P ₂ of 102 is provided. The output of the NAND circuit 50 is supplied to the control terminal 44b via the inverter 49, and the NAND circuit 50 is connected to the switch 10.
The output P ₂ of the switch 100 and the output P ₀ of the switch 100 are supplied via the inverter 51.

Reference numeral 52 indicates a rotational speed switching circuit for the capstan 6, which is connected to the belt changing solenoid 5 described above.
22 and a drive circuit 52 that operates this solenoid.
It is composed of 1. The solenoid drive circuit 521 is supplied with the output _P5 of the AND circuit 53 as a control signal, and when the output _P5 of the AND circuit 53 becomes "high level", the solenoid 522 is operated. It is configured as follows. The AND circuit 53 receives the AND output P ₆ of the output P 0 of the switch 100 and the output P ₂ of the switch 102 via the AND circuit 55, and the output P ₃ of the switch 103 and the output P ₄ of the switch 104 via the _OR circuit 56. The OR output _P7 is now supplied.

In addition, circuit blocks 57 and 58 indicated by dotted lines in FIG. 7 are a clutch solenoid drive circuit,
The clutch solenoid driven by this drive circuit is shown, and there is an alternative configuration in which the clutch switching plate 27 is operated using the clutch solenoid 58 instead of using the operating protrusion 8a formed on the lower surface of the loading ring 8. This circuit is added in the case of the embodiment, and the output _P0 of the switch 100 is supplied to the solenoid drive circuit 57 as a control signal. And this drive circuit 5
7, the output P ₀ of the switch 100 is "high level"
The clutch solenoid 58 is configured to be driven when the clutch solenoid 58 is turned on.

Although not particularly shown in FIG. 7, the capstan motor 18 is driven and starts rotating when any of the play button 43, fast forward button 30a, and fast rewind button 31a is pressed. When the fast rewind button 31a is pressed, the rotation direction is opposite (that is, the reverse direction) to the rotation direction (that is, the forward direction) when the play button 43 or the fast forward button 30a is pressed. It is configured to be rotationally driven.

To explain the operation of the above-mentioned device, when the tape is in the unloading state as shown in FIG. It is in a state where it is pressed by the actuating projection 8a. Therefore, the clutch switching plate 27 is located in a state where it is rotated clockwise in FIG. 3 against the urging force of a spring (not shown). Therefore, the clutch plate 23 whose protruding edge 23a is clamped by the clamping portion 27d of the clutch switching plate 27 is held in the raised position.
Projections 23b, 23 of the clutch plate 23 loosely fitted into the through holes 24d, 24d' of the drive pulley 24
b' is in a state of engagement with the engagement convex portion 26a of the intermediate ring 26. That is, in the tape unloading state, the rotational driving force of the motor 18 is applied to the drive pulley 24, the clutch plate 23, and the intermediate ring 26.
It is directly connected to the idler 14 via. Therefore, in this state, the fast forward button 30
a or by pressing the fast rewind button 31a and bringing the idler 14 into contact with the take-up reel stand 13 or the supply reel stand 12, the tape 39 is fed at high speed by driving the capstan motor 18 inside the cassette 2. It is done directly by force.

When the above-mentioned apparatus is placed in a playback state, the play button 43 is pressed. That is, when the play button 43 is pressed, the play button 43 is locked at the pressed position by a locking mechanism (not shown), the switch 102 is held in the ON state, and the output P ₂ changes from "low level" to "high level". Change. At this time, the loading completion detection switch 100 is in the OFF state and its output P ₀
is at "low level", all the inputs of NAND circuit 50 become "high level", and the output of NAND circuit 50 changes to "low level". As a result, the drive control circuit 44 of the loading motor 9
A "high level" signal is supplied to the control terminal 44b of. In this case, since the output P ₂ of the switch 102 is in the "high level" state, one input of the NAND circuit 46 is in the "low level" state, and the output of the other control terminal 44a is in the "high level" state. , so a "low level" signal is supplied. Therefore, a drive current flows through the motor 9 in the direction of arrow F by the drive control circuit 44, and the motor 9 starts rotating. As a result, gear 1
1, the loading ring 7 is rotated in the direction of arrow B in FIG. 1, and the loading ring 8 is rotated in the direction of arrow C in FIG. 1, through gears 11 and 10, respectively. 4 and 3 are moved along a predetermined path, the tape 39 is pulled out from the inside of the cassette 2, and winding around the tape guide drum 36 is started. At the same time, the unloading completion detection switch 101 is released from the pressure exerted by the operating protrusion 7b formed on the loading ring 7, and its output _P1 changes from "high level" to "low level". The loading rings 7 and 8 are rotated within a predetermined angle range,
When the loading of the tape 39 is completed, the loading completion detection switch 100 is pressed by the operating protrusion 7a formed on the loading ring 7 and becomes ON, and the output _P0 changes from the "low level" to the "high level". ”. Therefore, one output of the NAND circuit 50 becomes "low level", and the output of the NAND circuit 50 changes from "low level" to "high level". As a result, a "low level" signal is supplied to the control terminal 44b of the drive control circuit 44. At this time, the control terminal 44a is the output of the switch 102.
Since _P2 is in the "high level" state, a "low level" signal is supplied as described above. Therefore, the drive control circuit 44 is in a state where the rotation of the loading motor 9 is stopped. As a result,
Rotation of the loading rings 7 and 8 is stopped.

Further, upon completion of the loading of the tape 39, the pinch roller 5 is pressed against the capstan 6 by a control means (not shown), and the tape 39 is run at the normal playback speed. Then, in conjunction with the pressing of the pinch roller 5 to the capstan 6, the take-up idler 28 is pressed against the take-up reel stand 13 by a drive mechanism (not shown), and the take-up reel stand 12 is driven to take up the tape 39. Start. In this state, an electrical signal recorded on the tape 39 is read out by a rotating head (not shown) and a reproduction electronic circuit (not shown) disposed inside the tape guide drum 36, and predetermined signal processing is performed. The recorded image is reproduced by being supplied to the illustrated display device. In other words, the device is in a playback state. In this regenerated state, the actuating piece 27b of the clutch switching plate 27 is released from the pressure of the actuating protrusion 8a formed on the lower surface of the loading ring 8, and the clutch switching plate 27 is attached by a spring (not shown). 3 and held in the position shown in FIG.
As a result, the clutch plate 23 has its protrusion 23
b, 23b' are held in a position where they do not engage with the engagement protrusion 26a formed on the intermediate ring 26. Therefore, the rotational driving force of the motor 18 is applied to the drive pulley 2.
4, it is in a state where it is transmitted to the idler 14 via the sliding member 25 and the intermediate ring 26.

In the playback state described above, the fast forward button 30
a or when you press the fast rewind button 31a,
The idler 14 is brought into contact with the take-up reel stand 13 or the supply reel stand 12, the sliding plate 32 is slid to the left in FIG. idler 28
is separated from the take-up reel stand 13. At the same time, switch 103 or switch 104
It is in the ON state, and its output P ₃ or P ₄ becomes "high level". Therefore, the output of the OR circuit 56
P ₇ changes from "low level" to "high level". When the device is in the playback state, the outputs P ₀ and P ₂ of the switches 100 and 102 are both at "high level", so the output of the AND circuit 55 is
_P6 becomes a "high level", and as a result, the output _P5 of the AND circuit 53 becomes a "high level". As a result, a "high level" control signal is supplied to the solenoid drive circuit 521 of the rotational speed switching circuit 52, and the belt changing solenoid 521
is driven, and the capstan driving belt 6b
, the small diameter portion 1 of the shaft 19 of the capstan motor 18
9a to the large diameter portion 19b. In this case, the rotation direction of the capstan motor 18 is as follows when the fast rewind button 31a is pressed as described above.
flipped in the opposite direction. As a result, the tape 39 becomes
The pinch roller 5 and the capstan 6 cause the tape to run in the forward or reverse direction at a search mode tape running speed that is higher than the tape speed during normal playback. At this time, as mentioned above, the reel stand on the tape winding side, that is, the take-up reel stand 1 during fast forwarding.
3. At the time of early rewinding, the idler 14 is brought into contact with the supply reel stand 12 and is rotationally driven by the idler 14. In this case, the idler 14 is connected to the capstan motor via the sliding member 25 as described above. 18, the tape can be smoothly wound with an appropriate torque during high-speed searching in either the forward or reverse direction.

To stop the apparatus in the reproducing state, the stop button 57 is pressed. When the stop button 57 is pressed, the play button 43 is unlocked by a lock release mechanism (not shown). As a result, the switch 102 becomes OFF, and its output _P2 changes from "high level" to "low level". As a result, the control signal supplied to the control terminal 44a of the drive control circuit 44 of the loading motor 9 changes from "low level" to "high level". At this time, the above switch 1
Since the output P ₂ of 02 is at "low level", the control signal supplied to the control terminal 44b is at "low level". As a result, the drive control circuit 44
A driving current is applied to the motor 9 in the direction of arrow E to drive the motor 9. In this case, the direction of the current flowing through the motor 9 is opposite to the direction of rotation during loading, that is, the direction of arrow F.
is rotated in the opposite direction to that during loading. Therefore, loading rings 7 and 8 each start rotating in the opposite direction to that during loading. Furthermore, in synchronization with the rotation of the loading rings 7 and 8, the pinch roller 5 is separated from the capstan 6 by a control means (not shown), and in conjunction with the operation of the pinch roller 5, the take-up idler 28 is also wound. It is separated from the take-up reel stand 13. At the same time, the loading completion detection switch 100 activates the actuation piece 7a of the loading ring 7.
is released from the pressure, and the switch 100 turns OFF.
state, and its output P ₀ changes to "high level" or "low level". As the loading rings 7 and 8 rotate in the unloading direction, the tape pull-out means 4 and 3 move in a direction to accommodate the tape 39 inside the cassette 2, contrary to the loading operation. In this case, the rotation of the loading ring 8 is transmitted to the supply reel stand 12 by a power transmission mechanism (not shown), and the surplus tape is wound up.
Then, when the loading ring 7 rotates to the unloading completion position, the unloading completion detection switch 101 is pressed by the actuating piece 7b, becomes ON, and its output _P1 changes from "low level" to "high level". . As a result, the NAND circuit 46
One of the inputs becomes "low level", the output of the NAND circuit 46 changes from "low level" to "high level", and the control terminal 44 of the drive control circuit 44 changes from "low level" to "high level".
The control signal supplied to a becomes "low level". At this time, since the control signal supplied to the other control terminal 44b is at "low level", the drive control circuit 44 stops the rotation of the motor 9. That is, the rotation of the loading rings 7, 8 is stopped and the unloading is completed as shown in FIG. In this state, as described above, the actuating piece 27b of the clutch switching plate 27 is
It is in a state where it is pressed by the operating protrusion 8a of the loading ring 8. The tapered surface of the stopper portion 27c formed on one side of the actuating piece 27b functions to smoothly guide the actuating protrusion 8a to the actuating piece 27b during unloading.

In the above embodiment, the clutch plate 23 is operated by displacing the clutch switching plate 27 by rotation of the loading ring 8, but the present invention is not limited to this.
For example, the clutch switching plate 27 is configured to be displaced by driving the clutch solenoid 58 as shown by the dotted line in FIG. It is also conceivable to configure it so that it is driven when it is in the ON state.

As explained above, according to the present invention, in a device that runs a loaded tape at a constant speed not only in the playback mode but also in the search mode, the pressure contact between the capstan and the pinch roller and the action of the sliding torque transmission member are effective. By interlocking with the loading mechanism, the torque setting of the reel stand when driving the reel stand and capstan with one motor can be realized with a simple configuration.

[Brief explanation of the drawing]

1 and 2 show the configuration of a magnetic recording and reproducing apparatus according to an embodiment of the present invention, respectively. FIG. 1 is a plan view in an unloading state, and FIG.
The figure is a plan view of the loading state, and Figure 3 is the second
4 is an exploded perspective view of the idler drive mechanism, FIG. 5 is a perspective view of the clutch switching plate, and FIG. 6 is a side view taken from the direction of arrow D in FIG. 3. 7 is a circuit diagram showing a loading motor drive circuit and a capstan rotation speed switching circuit, and FIG. 8 is a perspective view showing a capstan drive mechanism. 5...Pinch roller, 6...Capstan, 6
b... Capstan drive belt, 7, 8... Loading ring, 9... Loading motor,
12... Supply reel stand, 13... Take-up reel stand,
14... Idler, 18... Capstan motor, 19... Capstan motor rotating shaft, 39
...Tape, 522...Solenoid for belt replacement.

Claims (1)

[Claims] 1. A reproduction mode in which a tape-shaped recording medium is attached around a tape guide drum having a rotating head in a loading state, and a signal is reproduced while the medium is conveyed at the same speed as during recording; and the loading state. A device capable of operating in a search mode in which a signal is reproduced while conveying the medium at high speed, and in a fast forward mode in which the medium is conveyed at high speed in an unloaded state in which the medium is not attached to the drum. A loading mechanism for setting the tape-shaped recording medium in the loading state and the unloading state, a detection means for detecting the tape-loading state of the loading mechanism, and transporting the tape-shaped recording medium. a capstan and a pinch roller for driving the capstan, a capstan motor for driving the capstan, a power transmission mechanism for transmitting the driving force of the capstan motor to a reel stand, and the capstan motor and the reel stand. and a sliding torque transmitting member disposed between the capstan and the pinch roller with the medium in between when the tape-shaped recording medium is in the loading state according to the detection by the detection means. and transmitting the driving force of the capstan motor to the reel stand via the sliding torque transmission member to separate the capstan and the pinch roller when the tape-shaped recording medium is in the unloading state. A rotary head type reproducing device characterized in that the driving force of the capstan motor is transmitted to the reel stand without going through the sliding torque transmitting member.