JPS62270048A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To enable the recording and reproducing of an image and voice by the reverse by making the structure of a tape running system about symmetric with respect to a cylinder drum and controlling a tape tension according to the tape running direction. CONSTITUTION:Two sets of tape guide means consisting of pinch rollers 10, 25 and tape guides 15, 60, 30, 61 with a drum 4 and capstan shaft 3 as the center are arranged about symmetrically in the vicinity of the cylinder drum 4 inclined in the prescribed direction by holding a rotary magnetic head and the capstan shaft 3. A pinch roller selecting plate 51 is made rotatable with the shaft 52 as the center and the regulating pin 57 fixed to the selective lever 55 selectively abuts the pinch roller to the capstan shaft 3 in a tape loading state. The tension pins 58, 59 interposed on a tape passage is interlocked with the selection of the pinch roller and by shifting to the mode to make the both at fixed position and to the mode to control the tape tension by releasing the fixture of one part side only the recording and reproducing of the reversal can be performed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a magnetic recording and reproducing device that can be used as a video or audio tape recorder.

(Prior art) Conventional video tape recorders do not use tape as a multi-track, so they record and play back while running the tape in only one direction. Video tape recorders do not have a reverse type like the one you see. With the configuration of the tape running system in conventional video tape recorders, it is not possible to create a symmetrical shape around the cylinder drum that holds the rotating magnetic head, and the tape running conditions in both directions, especially the tape tension, cannot be made symmetrical. One of the reasons is that it is not possible to do so.

(Problem to be solved by the invention) Nowadays, video tape recorders are made into PCM (
A tape recorder that also functions as a pulse code modulation (pulse code modulation) audio recording and replay tape recorder has been put into practical use. According to this dual-purpose tape recorder, the tape is used as a multi-trunk when recording and reproducing audio, and it is possible to record over a long period of time on one tape.

However, as mentioned above, conventional video tape recorders are not reverse type, so when trying to record and play back audio on a dual-purpose tape recorder, the tape must be rewound each time recording and playback of one track is completed. After that, it is necessary to record and play back from the beginning of the tape again, and there is a problem that the sound is interrupted during rewinding.

The present invention has been made to solve these conventional problems.The present invention has been made in such a way that the configuration of the tape running system is approximately symmetrical with respect to the cylinder drum, and the tape tension is controlled according to the running direction of the tape. It is an object of the present invention to provide a magnetic recording/reproducing device which can make the running conditions in both directions substantially the same, thereby making it possible to record and reproduce images and sounds in reverse.

(Means for Solving the Problems) The present invention includes a capstan shaft for running a tape wound around a cylinder drum, and a tape that is brought into pressure contact with the capstan shaft so that the tape can be taped by cooperating with the capstan shaft. a pinch roller moving means for moving two pinch rollers for traveling to the vicinity of the capstan shaft, and a mode in which neither of the two pinch rollers contact the capstan shaft, and a mode in which the two pinch rollers contact only on one side. a pinch roller selection means that can be selected to a mode in which the pinch rollers The present invention is characterized by comprising a tension roller control means for switching between a mode and a mode in which only one side is released from fixation and tape tension control is performed.

(Function) The two pinch rollers are moved close to the capstan shaft by the pinch roller moving means.

In the stop mode, the pinch roller selection means does not bring either of the two pinch rollers into contact with the capstan shaft;
In the forward recording/reproducing mode, one pinch roller is brought into contact with the capstan shaft, and in the reverse recording/reproducing mode, the other pinch roller is brought into contact with the capstan shaft.

The tension roller control means fixes both tension rollers at fixed positions, or fixes only one of the two tension rollers, depending on each operation mode such as fast forwarding, rewinding, recording/reproducing in the forward direction, recording/reproducing in the reverse direction, etc. to control tape tension.

(Example) Hereinafter, an example of a magnetic recording/reproducing apparatus according to the present invention will be described with reference to the drawings.

FIG. 1 shows the state immediately after loading the tape cassette 1 and starting tape loading, and FIGS. 2 and 3 show the state before tape loading. In Figures 1 to 3,
A portion of tape 2 stored in cassette 1 is
The exposed portion of the tape 2 is exposed from one side of the cylinder drum 4, and when the cassette 1 is loaded into a predetermined position of the recording/reproducing apparatus, the exposed portion of the tape 2 faces the circumferential surface of the cylinder drum 4. A capstan shaft 3, designated by reference numeral 3, protrudes from the chassis and is rotationally driven in both directions by a capstan drive motor (not shown). The cylinder drum 4 holds a rotary magnetic head as is well known. Drum 4 is the first
As shown in Fig. 7, it is inclined in the direction of a line a perpendicular to the line A connecting the center of the drum 4 and the center of the capstan shaft 3, but in Fig. 1, the center line of the tape to be wound is Only the corresponding parts are shown.

A drive gear 5 rotatable by a shaft 6 is arranged outside the cylinder drum 4. The gear 5 is rotationally driven in both directions by a motor which will be described later. Above drum 4
An annular gear 7 is rotatably arranged by an appropriate number of guide pins 8 so as to surround it. Above the annular gear 7, there are two guide grooves 9a that roughly follow the outer periphery of the drum 4.
, 9b (see FIG. 16) is arranged. In FIG. 1, only these guide grooves 9a and 9b are shown virtually. The guide grooves 9a and 9b are
Guide for moving the two pinch rollers 10.25 between the original position as shown in FIG. 1 and the tape loading position where they can be pressed against the capstan shaft 3 as shown in FIG. becomes.

As also shown in FIG. 6, the first pinch roller 1
0 is rotatably supported by a shaft 11 on a pinch roller support plate 12. The pinch roller support plate 12 is rotatably mounted on the first movable table 13 via a shaft 14. The tape guide 1 is attached to the moving table 13 together with appropriate pins.
5 is provided. A coil spring 16 is wound around the pin holding the tape guide 15, and each end of the spring 16 is hung on the protrusion 17 of the moving table 13 and the pinch roller support shaft 11, so that the pinch roller support plate 12 is attached to the shaft 14. It is urged to rotate clockwise around . A protrusion 18 is formed by bending on the pinch roller support plate 12 to abut on the side edge of the moving table 13 to regulate the position of the pinch roller 10, and a protrusion 18 abuts on the free end of the pinch roller support plate 12. The portion 19 is formed by bending.

As shown in FIG. 7, a first guide pin 20 and a second guide pin 21 are fixedly planted on the lower surface of the moving table 13, and each guide pin 20, 21 controls the movement of the pinch roller 10. It fits into a guide groove 9a that serves as a guide. A drive plate 22 is connected to the guide bin 21 .

A pin 23 is fixed to the drive plate 22, and the pin 23 is fitted into an escape groove 24 formed in the circumferential direction of the annular gear 7.

A tension spring 38 is hung between the pin 23 and a pin 37 fixed to the annular gear 7. The spring 38 is for moving the drive plate 22 along the right side of the cylinder drum 4 when the annular gear 7 rotates counterclockwise in FIG.

In FIGS. 1 and 8, the second pinch roller 25 is supported on a pinch roller support plate 27 so as to be rotatable about a pinch roller support shaft 26. As shown in FIG. The pinch roller support plate 27 is rotatably mounted on the second movable table 28 by a shaft 29. A tape guide 30 is provided on the movable base 28 integrally with a pin fixed to the movable base 28. A coil spring 31 is wound around the support shaft of the tape guide 30.
Both ends of this spring are hooked on the protrusion 32 of the movable table 28 and the shaft 26, so that the pinch roller support plate 27 is urged to rotate counterclockwise in FIG. 1 about the shaft 29. The pinch roller support plate 27 has a protrusion 33 formed by bending to abut against the side edge of the moving base 28 and regulate the position of the pinch roller 25, and a contact portion 34 is formed at the free end of the pinch roller support plate 27. It is formed by bending.

A first guide bin 35 and a second guide bin 36 are fixedly planted on the lower surface of the moving table 28, and each guide pin 35, 36 is
It fits into a guide groove 9b that guides the movement of the second pinch roller 25.

In FIGS. 1, 12, and 13, a transmission gear 39 is engaged with the annular gear 7 on the opposite side of the drive gear 5 and has a shaft 40 as its center of rotation. Tradition.

A fan-shaped gear 41 whose rotation center is a shaft 42 is meshed with the reach gear 39. A pin 43 is fixed to the fan-shaped gear 41. A moving lever 44 is rotatably provided on the shaft 42, and a pin 45 is fixed to the lever 44.

The pin 43 protrudes toward the lever 44 side, and the pin 45 protrudes toward the fan-shaped gear 41 side, and the two pins 43 and 45 are provided so as to be able to come into contact with each other. A coil spring 46 is wound around the shaft 42.
By hooking both ends of the spring 46 to the pins 43 and 45, the fan-shaped gear 41 and the lever 44 are biased in the direction in which these pins 43 and 45 come into contact. Lever 44
A long hole 47 is formed in the free end of the guide pin 35, and the guide pin 35 is fitted into the long hole 47. Therefore, when the lever 44 rotates counterclockwise in FIG. 1, the moving table 28 and the pinch roller support plate 27 move along the guide groove 9b via the long hole 47 and the pin 35, A pinch roller 25 moves on the left side of the cylinder drum 4.

In FIG. 1, a rotary drive body 48 and a cam 50 connected by a shaft 49 are arranged in the lower central part. The rotary drive body 48 and the cam 50 are driven by a motor (not shown). There is a shaft 52 on the side of the cam 50.
A pinch roller position selection plate 51 is arranged so as to be rotatable about the center. The pinch roller position selection plate 51 has three arms and is biased by a spring 53 to rotate in the counterclockwise direction in FIG. It is in contact with the cam edge on the outer periphery of.

A long hole 5 is provided at the end of the other arm of the pinch roller position selection plate 51.
4, and a pin 56 having an area corresponding to one arm of the selection lever 55 is fitted into the elongated hole 54. As shown in FIG. 11, the selection lever 55 is rotatable about the shaft 40, and the other arm end of the selection lever 55 has a regulating bin 57. The regulating pin 57 is for regulating the positions of the two pinch rollers 10.25 in the tape loading state and bringing these pinch rollers 10.25 into selective contact with the capstan shaft 3,
It lies on a line connecting the center of the capstan shaft 3 and the center of the cylinder drum 4.

1 to 4, reference numerals 58 and 59 indicate tension levers 9B on the right and left sides of the cylinder drum 4.
, 102. The tension lever 9 is rotatably supported around a shaft 97, and is urged to rotate clockwise by a spring 100. The tension lever 102 is rotatably supported around a shaft 101, and is biased to rotate counterclockwise by a spring 105. Each tension lever 98.102 has a separate pin 99.
103, and the pin 99 fits into the length 492 formed in the width direction at the end of the slide plate 90, and the pin 99
03 is a convex window hole 9 formed in another slide plate 94
It is embedded in 5.

Each slide plate 90.94 is pivotally connected by a shaft 93, and both ends of a spring 96 wound around the shaft 93 are connected to each slide plate 90.94.
94, the slide plate 90 is biased to rotate clockwise relative to the slide plate 94, and the slide plate 94 is biased to rotate counterclockwise relative to the slide plate 90.

At the end of the slide plate 90, a long groove 91 is formed in the width direction of the slide plate 90 so as to be adjacent to the small long groove 92, and in the long groove 91, a pin 8 having an area on the end of the lever 83 is formed.
8 is inserted. The lever 83 is disposed along the right side of the cylinder drum 4, and is rotatably supported around a shaft 84 provided near the gear 5, and is rotated counterclockwise in FIG. 1 by a spring 85. A pin 86 is formed at the end of the lever 83 opposite to the pin 88, and a contact portion 87 is formed by bending the side edge near the pin 86. The contact portion 87 is in pressure contact with the cam surface of the eccentric cam 74 due to the rotational biasing force.The lever 83 is pivotally connected to the connecting plate 89 by the pin 86, and the connecting plate 89 is pivotally connected to the lever 76 by the pin 81. There is.

The lever 76 is rotatably supported around a shaft 73, and is biased to rotate counterclockwise in FIG. 1 by a spring 82. The shaft 6 of the gear 5 is provided at the end of one arm of a lever 76, and the gear 5 engages with the annular gear 7 when the lever 76 rotates clockwise against the force. The shaft 73 is common to the rotation axis of the eccentric cam 74, and the eccentric cam 74 is provided integrally with the gear 72 and the pulley 75. The gear 72 is rotationally driven by a worm 71 on the output shaft of the tape loading motor 70, and this rotational force drives the eccentric cam 74, and the rotational force is transmitted to the gear 5 via a pulley 75 and a belt 80.
The signal is transmitted to the gear 5'1)'79, which is integral with the gear 5, thereby rotating the gear 5.

Before the tape is loaded as shown in FIGS. 2 and 3, the lever 83 has a contact portion 87 that presses against the mesial cam edge of the eccentric cam 74 and rotates counterclockwise to release the pin. 8
8, the slide plate 90 is moved to the right, and the slide plate 94 is also moved to the right. As a result, the pin 9 fitted into the small long groove 92 of the slide plate 90
9 rotates the tension lever 98 counterclockwise, while the convex 1JS1 of the window hole 95 of the slide plate 94
The tension lever 102 is rotated clockwise by the pin 103 fitted in the cassette 04, and each tension pin 58, 59 is located inside the exposed portion of the tape 2 of the loaded cassette 1.

In FIGS. 1 and 2, on the side of the lever 83 is a lock lever whose rotation center is a shaft 113 provided on the chassis.
114 are provided. The lock lever 114 has a hook-shaped lock portion 115 on one arm side and a contact portion 116 formed by bending, and is urged to rotate clockwise by a spring 117. The other arm of the locking lever 114 is in the passage of a pin 118 which is located in the annular gear 7. Before loading the tape, the loft lever 114 is pushed by the bottle 11H and rotated counterclockwise against the biasing force, as shown in FIG. When the bin 118 moves with the motion, the first
As shown in the figure, it is rotated clockwise by the biasing force. When the lock lever 114 is rotated clockwise, the lock portion 115 locks the shaft 6 and holds the drive gear 5 in mesh with the annular gear 7. The lever 83 comes into contact with the lever 83 to prevent the lever 83 from returning to its rotational direction in the biasing direction.

As shown in FIGS. 3 and 4, on the opposite side of the pinch roller position selection plate 51 with the cam 50 in between, a lever 109 is provided that rotates about a shaft 108. The lever 109 is urged to rotate clockwise by a spring 111,
This biasing force causes the end of one arm of the lever 109 to come into pressure contact with the cam surface of the cam 50. A bottle 110 is provided at the end of the other arm of the lever 09. As shown in FIG. 4, the bottle 110 is formed on the slide plate 90 by rotating the lever 109 against the applied force while the slide plate 90 is moved to the left. The slide plate 9 engages with the engagement surface 112 formed by an arc-shaped notch.
It is designed to push up 0. Further, a pin 1 is attached to the end of one arm of the pinch roller position selection plate 51 having three arms.
06, and when the selection plate 51 is rotated clockwise against the force while the slide plate 94 is moved to the left as shown in FIG. is the engagement surface 107 formed on the slide plate 94.
The slide plate 94 is engaged with the slide plate 94 and pushed up.

In Figure 1, the chassis has tape guides 60 and 61.
is integrally provided, and guides the running of the tape 2 wound around the cylinder drum 4 by the tape loading operation.

A stopper 62 is fixed to the chassis on the side of the capstan shaft 3. The stopper 62 positions the pinch roller 10.25 in the tape loading state, and is a 7-shaped regulating surface 62 that comes into contact with the bin 14 of the first moving table 13 and determines the position of the pinch roller 10.
a, and a V-shaped regulating surface 62b that comes into contact with the shaft 29 of the second moving table 28 to determine the position of the pinch roller 25,
Further, a tape guide 63 is provided integrally with the stopper 62.

In FIGS. 1, 14, and 15, a shaft 65 having a surface area of the lever 64 is fitted into the guide groove 9a of the annular gear 7. As shown in FIGS. A tape guide 64 is provided on the shaft 65. The tape guide 64 is guided by the guide groove 9a and moves to a predetermined position as the annular gear 7 rotates. A bottle 67 is provided at the other end of the lever 64 . The pin 67 is fitted into the relief groove 24 of the annular gear 7 and is pushed by a leaf spring 68 provided at the end of the relief groove 24, thereby moving the lever 66 to a predetermined position.

Note that the diameter of the shaft 65 is the same as that of the first and second guide bins 20 and 21.
The guide i9a, which is thicker than the diameter of the shaft 65 and guides the movement of these shafts and guide pins, is wide in accordance with the diameter of the shaft 65 within the movement range of the shaft 65.
The width of the guide groove 98 outside that range is the width of the guide pin 20.
Since the width is set to be somewhat narrow to match 21, the axis 65
is pushed by a leaf spring 68 and positioned at a predetermined position at the end position of the width range of the guide groove 9a that matches its diameter.

Next, the operation of the above embodiment will be explained.

When the cassette l is not loaded, the pinch roller position selection plate 51 and the selection lever 55 are at the middle position of the rotation range as shown in FIG. has been decided.

When the cassette 1 is placed in a predetermined position, a switch (not shown) detects this, starts the motor 70, and starts the worm 7.
1 is driven, and the gear 72, the cam 74 integrated therewith, and the pulley 75 are rotationally driven. This rotational force is Bell 1-80
The signal is transmitted to the pulley 79 and the drive gear 5 through the pulley 79, but initially the drive gear 5 was an annular gear as shown in FIG.
7, the annular gear 7 does not rotate. As the cam 74 rotates, the cam edge of the cam pushes the contact portion 87 of the lever 83, as shown in FIG. 1, and rotates the lever 83 clockwise against the biasing force. As shown in FIG. 5, the rotation of the lever 83 causes the slide plate 90 connected to the lever 83 by the pin 88 and the long groove 91, and the slide plate 94 pivotally connected thereto by a shaft 93 to move. be moved to the left. By moving the slide plate 90 to the left, the pin 99 fitted in the small elongated groove 92 is moved to the left, and the tension lever 98 is rotated clockwise. Further, as the slide plate 94 moves to the left, its engagement surface 107 rides on the pin 106 of the pinch roller position selection plate 51, and as a result, the convex-shaped window hole 95 of the slide plate 94 moves to the upper left. Moving. This movement of the window hole 95 pushes the pin 103 that engages with the convex groove 104 of the window hole 95, and the tension lever 102 is rotated counterclockwise. These tension levers 98
．． 102 rotates the tension bin 58.59 to the first position.
Move to both sides of the drum 4 as shown in the figure,
A portion of tape 2 is pulled out from cassette 1. In this state, the pin 99 of the tension lever 98 is engaged with the small elongated groove 92 of the slide plate 90, and the tension pin 58 is in a fixed state, and the pin 103 of the tension lever 102 is engaged with the convex groove 102 of the slide plate 94. Since the tension pins 59 are engaged with each other and are in a fixed state, each tension pin 58 and 59 are
The position of will not change.

By rotating the lever 83 clockwise, the bin 86 moves to the right. At the initial stage of the rightward movement of the bin 86, the connecting plate 8
9 only rotates around the pin 81, but the lever 8
3 is further rotated clockwise by the cam 74, as shown in FIG. Rotate clockwise. This rotation of the lever 76 engages the drive gear 5 with the annular gear 7, and the annular gear 7 is rotationally driven by the drive gear 5 in the counterclockwise direction. This rotation of the annular gear 7 causes the pin 118 to move into the lock lever.
114, the long lever 114 rotates around the shaft 113 in the clockwise direction, which is the biasing direction. By this rotation of the lock lever 114, the shaft 6 extending below the lever 76 is locked by the lock portion 115 as shown in FIG. 1, and the engagement between the drive gear 5 and the annular gear 7 is continued. let

Further, when the cam 74 rotates further, the lever 83 becomes in a state where it can be rotated counterclockwise again due to the biasing force, but when the lock portion 115 of the lock lever 114 locks the shaft 6 as described above, The contact portion 116 contacts the side surface of the lever 83 to prevent the lever 83 from returning, and the slide plate 90.94 and the tension lever 98
．． 102 etc. are maintained in the state shown in FIG.

Due to the counterclockwise rotation of the annular gear 7, this rotational force is applied to the pin 37, spring 38, drive plate 22, and guide bin 21.
, the moving table 13, the shaft 14, and the pinch roller support plate 12 in this order, and the first pinch roller 10 moves counterclockwise around the drum 4 along the guide i9a. On the other hand, the rotational force of the annular gear 7 is transmitted through the transmission gear 39 and the sector gear 41.
, the pin 43, the spring 46, the pin 45, and the moving lever 44 in this order, and the lever 44 is rotated counterclockwise. The moving table 28 is moved along the guide groove 9b, and the second pinch roller 25 moves clockwise on the left side of the drum 4 accordingly.

Thus, as shown in FIGS. 9 and 15,
The first pinch roller support plate 12 and the first moving table 13 move while being substantially reversed from their original positions, and the second pinch roller supporting plate 27 and the second moving table 28 move substantially in parallel, so that the shaft 14 The shaft 29 fits into the regulating surface 62a of the stopper 62, and the shaft 29 fits into the regulating surface 62b of the stopper 62, and the two pinch rollers 1
0.25 are opposed to each other with the capstan shaft 3 interposed therebetween, and the contact portion 19 of the pinch roller support plate 12 and the contact portion 34 of the pinch roller support plate 27 are opposed to each other with the regulation pin 57 interposed therebetween.

At this point, the regulation pin 57 is in the intermediate position as described above, and the two abutting portions 19 and 34 are attached to the regulation pin 57.
, the two pinch roller support plates 12.27 are restricted from rotating in the biasing direction, and as shown in FIGS. 9 and 10, the two pinch rollers 10.25 are both capped. It is spaced apart from the stun shaft 3.

On the other hand, as the annular gear 7 rotates, the shaft 14.29 and the tape guide 15.30 move to the position shown in FIG.
It is further pulled out from the cylinder drum 4 and wound around the outer peripheral surface of the cylinder drum 4 in an "Ω" shape over a range of about 240 degrees. The rotation of the annular gear 7 causes the lever 66 to move from the original position to the substantially opposite side of the drum 4, and accordingly, the tape guide 64 is moved to the substantially opposite side of the drum 4.

In this way, by detecting the end of movement of one pinch roller with the switch, the rotation of the drive gear 5 is stopped,
End tape loading operation. At the end of tape loading, tape 2 pulled out from cassette 1
are tension pin 59, tape guide 63, shaft 29,
Pinch roller 25, tape guide 30. Tape guide 6
1, drum 4, tape guide 60, tape guide 15,
A tape running path is formed by the pinch roller 10, shaft 14, tape guide 64, and tension pin 58 in this order.

Here, the tape guide 15.60 and the other tape guide 30.61 are connected to the cylinder drum 4 and the capstan shaft 3.
The tape 2 is tilted in a predetermined direction as shown in FIG. Two tape guide means are formed.

As shown in FIG. 9, when tape loading is completed, the tape is not running yet. Also,
As shown in FIG. 10, two pinch rollers 1
The heights of the tapes 2 that correspond to 0.25 are the same height.

Here, it is assumed that the drive rotor 48 is rotated to rotate the cam 50 to the position shown in FIG.

Such a rotational position of the cam 50 is detected by a switch. Due to the above rotation of the cam 50, the pinch roller selection plate 51 rotates clockwise against the force, and the selection lever 5
5 rotates counterclockwise, and the regulating pin 57 moves to the left. As a result, the regulation pin 57 escapes from the contact portion 19 of the first pinch roller support plate 12, but remains in contact with the contact portion 34 of the second pinch roller support plate 27, so that the pinch roller Only the support plate 12 rotates in the urging direction, and the first pinch roller 10 presses the tape 2 against the capstan shaft 3. The drum 4 and the capstan shaft 3 are rotated counterclockwise in advance at a constant speed, and by pressing the tape 2 against the capstan shaft 3, the tape 2 is moved in the direction shown by the arrow in FIG. ,
Transported at constant speed. As is well known, the tape 2, which is transported at a constant speed, is recorded and reproduced by a rotary magnet held by a drum 4 while diagonally scanning the tape 2. This is referred to as forward recording/reproduction. Although not shown, the take-up reel stand is driven to rotate as usual to wind up the tape.

Further, due to the rotation of the cam 50, the pinch roller position selection plate 51 is rotated clockwise as shown in FIG. Bin 10 of tension lever 102
3, the convex groove 104 of the slide plate 94 is released, so that the tension lever 102 can freely rotate. Therefore, the tension lever 102 rotates according to the force relationship between the tape tension and the spring 105, and the tension lever 102 rotates according to the force relationship between the tape tension and the spring 105.
02, a brake band connected to the tension lever 102 and wound around the reel stand is brought into pressure contact with the reel stand or loosened, thereby controlling the braking force applied to the reel stand. More specifically, if the tension lever 102 rotates slightly counterclockwise, it means that the tape tension is weak, so the brake band is pressed against the reel stand on the supply side, and the brake is applied to the reel stand to increase the tension. On the other hand, when the tension lever 102 rotates clockwise, the tape tension is strong, so the pressure of the brake band against the supply reel stand is weakened to weaken the tape tension. In this way, the tape tension is maintained substantially constant.

During the above rotation of the cam 50, the lever 109 is not rotated, and the slide plate 90 is also held in the state shown in FIG.
Since the tension pin 5 remains inserted into the small &tj 92, it is held in a fixed state as shown in FIG. 4 and serves as a tape guide.

Next, when recording and playing in reverse mode, the cam 50
is rotated to a predetermined position as shown by the chain line 50A in FIG. 57 to the right of the intermediate position as shown in FIG. As a result, the regulation pin 57 escapes from the contact portion 34 of the second pinch roller support plate 27, but comes into contact with the contact portion of the first pinch roller support plate 12, so that the pinch roller support plate 27 Only the second pinch roller 25 rotates in the urging direction, and the second pinch roller 25 presses the tape 2 against the capstan shaft 3. In the reverse mode, since the capstan shaft 3 is rotated clockwise in advance, the tape 2 is transported at a constant speed in the reverse direction, and the tape 2
On the other hand, the rotary magnetic head performs recording and reproduction while scanning diagonally.

In addition, in the reverse mode, the cam 50 is connected to the chain line 5 shown in FIG.
By being rotated to the position indicated by 0A, the lever 109 is rotated counterclockwise against the force, and the bottle 110 pushes the engagement surface 112 of the slide plate 90. As a result, the slide plate 90 is pushed up and its small elongated groove 92 escapes from the pin 99 of the tension lever 98, allowing the tension lever 98 to rotate freely. Therefore, the tension lever 98 assumes a rotational position according to the force relationship between the tape tension and the spring 100. As in the case of the tension lever 102, the tension lever 98 is connected to a brake band for the supply side reel stand in the reverse mode, and the brake band is connected to the supply side according to the rotational position of the tension lever 98. The tape tension is controlled to be substantially constant by controlling the pressure applied to the reel stand.

On the other hand, at the rotational position of the cam 50, the pinch roller position selection plate 51 rotates counterclockwise due to the force, and the pin 106 escapes from the engagement surface 107 of the slide plate 94. The pin 103 of the tension lever 102 is fitted into the protrusion i 104, and the tension lever 10
2 is restrained so as not to rotate, thereby keeping the tension pin 59 in a fixed state and allowing the tension pin 59 to play the role of a tape guide.

Cam 50, pinch roller position selection i51, and lever 1
09 and two slide plates 90.94 is a tension pin that switches between a mode in which both of the two tension run pins 58 and 59 are fixed, and a mode in which only one side is released from the fixation to perform tape tension control. It constitutes a control means.

Note that the direction of rotation of the drum 4 in the reverse mode may be clockwise or counterclockwise as long as the directions during recording and playback are the same.

After recording and reproducing, a part of the tape 2 is wound into the cassette 1 by rotating the reel stand, and the annular gear 7
is rotated in the opposite direction, the cam 50 is returned to its original position, and the motor 70 is reversely rotated to return each member to its original position.

The pinch roller 10 moves in the opposite direction in the guide groove 98 because the bottle 23 is pushed against the end face of the escape groove 24.

According to the above embodiment, two pinch rollers 10.25 are provided near the cylinder drum 4 and the capstan shaft 3, with the cylinder drum 4 and the capstan shaft 4 as centers,
Since the two sets of tape guide means consisting of tape guides 15, 60, 30, and 61 are arranged approximately symmetrically, one of the two pinch rollers 10, 25 can be selectively attached to the capstan shaft 3. By applying pressure, the tape can be selectively run in both directions at a constant speed. Moreover,
Two tension pins 58 and 59 respectively interposed in the tape path between the two pinch rollers and the two reel stands.
can be switched between a mode in which both sides are fixed in conjunction with the pinch roller selection described above, and a mode in which only one side is released from the fixation and the tape tension is controlled, allowing the tape to run in both directions. Since the conditions can be made substantially the same, it is possible to perform recording and reproduction in forward mode and reverse mode.

If the pinch rollers, tape guide means, etc. that make up the tape running system are constructed approximately symmetrically around the cylinder drum and capstan shaft, the arrangement of the capstan shaft, pinch rollers, etc. will be the same as that described above. It is not limited to things related to arrangement as in the example. Further, the two tension pins 58 and 59 may be tension rollers that rotate freely as the tape runs.

(Effects of the Invention) According to the present invention, the pinch roller moving means moves the two pinch rollers close to the capstan shaft, and the mode in which neither of the two pinch rollers comes into contact with the capstan shaft, Since a pinch roller selection means is provided for selecting a mode in which the tape is controlled, the tape running mode can be switched between the forward direction and the reverse direction by selecting the pinch roller selection means. Recording and playback in reverse mode, which was previously not possible, is now possible. Ma□
In addition, two tension pins, which are interposed in the tape path between the two pinch rollers and the two reel stands, are both fixed at the fixed position, and only one side is unfixed to control the tape tension. By switching to the two-way mode, it is possible to apply an appropriate tape tension according to the tape running mode, making it possible to make the tape running conditions in both directions the same. recording and playback became possible.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of the magnetic recording/reproducing device according to the present invention, FIG. 2 is a plan view of the tape loading mechanism drive section in the above embodiment, and FIG. 3 is a plan view showing the tension in the above embodiment. FIG. 4 is a plan view of the bottle control mechanism section; FIG. 4 is a plan view showing different operating modes of the tension pin control mechanism section; FIG.
Similarly, the figure is a plan view showing a different operating mode of the tension bin control mechanism portion, FIG. 6 is a plan view showing the first pinch roller portion in the above embodiment, and FIG. 7 is a cross-sectional front view of the same pinch roller portion. , FIG. 8 is a plan view showing the second pinch roller portion in the above embodiment, FIG. 9 is a plan view showing the aspect of the two pinch rollers in the tape loading state in the above embodiment, and FIG. 10 is a plan view showing the second pinch roller portion in the above embodiment. FIG. 11 is a partially sectional front view of a portion of the selection lever in the above embodiment, and FIG.
The figure is a front sectional view showing a part of the pinch roller moving mechanism in the above embodiment, FIG. 13 is a sectional front view of another part of the pinch roller moving mechanism, and FIG. 14 is a tape guide mechanism in the above embodiment. FIG. 15 is a plan view showing a different operating mode of the above embodiment according to FIG. 1;
FIG. 16 is a plan view showing the groove plate of the tape guide means of the guide in relation to other parts in the above embodiment, and FIG. 17 is a plan view schematically showing two of the above embodiments. . 2...Tape, 3...Capstan shaft, 4...Cylinder drum, 10.25...Two pinch rollers, 1
2.27... Pinch roller support plate constituting the pinch roller moving means, 13.28... Moving table constituting the pinch roller moving means, 58.59... Two tension pins. U16 [

Claims (1)

[Claims] A cylinder drum that holds a rotary magnetic head and is tilted in a predetermined direction, a capstan shaft for running the tape wound around the cylinder drum, and a capstan shaft that presses the tape against the capstan shaft. two pinch rollers for moving the tape by the action of the tape, a pinch roller moving means for moving the two pinch rollers to the vicinity of the capstan shaft, and both of the two pinch rollers abutting the capstan shaft. a pinch roller selection means that can be selected between a mode in which the pinch rollers are not brought into contact with each other and a mode in which they are brought into contact only on one side; two tension pins that are respectively interposed in the tape passages between the two pinch rollers and the two reel stands; A magnetic recording/reproducing device comprising tension pin control means for switching between a mode in which both pins are fixed at a fixed position and a mode in which only one side is released from fixation and tape tension control is performed.