JPH0296962A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To perform shifting to a reverse direction reproducing mode in which response is excellent by adding a motor, a reel base driving mechanism and a brake releasing mechanism to a tape supply side. CONSTITUTION:In a normal direction reproducing mode in which a magnetic tape 54 is shifted in a state where a pinch roller 45 is made to press-bond to a capstan 23, a reel base 31 on a take-up side is driven by the reel base driving mechanisms 25, 28 and 29. When the capstan 23 is reversely rotated to shift to the reverse direction reproduction, a motor 51 is stopped to stop the capstan 23 and a still mode can be set for an instant. In the still mode, the reel base 32 on a supply side is driven by a motor 1 and the reel base driving mechanisms 5 and 6. After that instant, the capstan 23 is reversely rotated to shift the tape 54 in a reverse direction. Thereafter, the tape 54 is taken up to the base 32 by the mechanisms 5 and 6. A tension band 61 which is wound around the base 32 is released by the motor 1.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a magnetic recording/reproducing device with improved mechanical response speed during mode transition.

2. Description of the Related Art In recent years, magnetic recording and reproducing devices have become multi-functional, such as methyl, forward/reverse slow motion, forward/reverse fast forward remote, and special playback functions that enable reproduction images with less noise to be obtained in forward/reverse frame-by-frame feed mode. On the other hand, it is also required for ease of use of the device that mode transitions between playback modes be quick. In order to speed up the mode transition, it is necessary to switch between forward and reverse playback modes while keeping the pinch roller pressed against the capstan. Also,
There is also a desire to lower the cost of the device, and in response to this, some devices have been developed that reduce the number of motors that drive the device. As a specific example, as shown in FIG. 6, there is a device in which a single motor drives a capstan and a pair of a supply reel stand and a take-up reel stand.

In FIG. 6, 61 is a first motor, which is integrally constructed with the capstan 23, and is a so-called capstan direct drive motor.

The first motor 51 arranged on the back surface of the Sharn board 5o
The power is transmitted to a center pulley 26 by a timing belt 24. In the center pulley 25,
The center pulley gear 26b is attached to the sensor pulley 26 coaxially with a friction member such as felt in pressure contact with an elastic member, and has a torque limiter function, rotates together with the center pulley 26, and is held at a fixed position. When the rotational torque is transmitted, a slip occurs between the center pulley 25 and the center pulley gear 2sb, and the transmitted torque is controlled. The rotational driving force of the center pulley gear 25b is transmitted to the first idler arm 27 and the first idler arm attached thereto.
The rotary gear 28 transmits power to the reel stand 31 or 32 via the first reel stand relay gear 29 or 3Q to rotationally drive the reel stand.

FIG. 6 shows a magnetic tape 64f in the tape cassette 17,
, pull out the tape cassette to the outside, and insert the magnetic tape 54'.
! This is a diagram when the magnetic tape 64 is attached to the i'' cylinder 20, the capstan 23 is interposed with the magnetic tape 64, and the pinch roller 46 is pressed, and the tape is transferred in the forward direction (arrow a1) to reproduce the signal in the forward direction. It is.

Next, FIG. 7 shows a state in which the first motor 51 is driven in reverse and the tape is transferred in the reverse direction with the pinch roller 46 pressed against the capstan 23 from the forward direction playback shown in FIG. This is a diagram. Reversal of the first motor 61 (arrow b2
direction), the capstan 23 rotates in the opposite direction (arrow b2
), and at the same time, the magnetic tape 64 is transferred in the opposite direction as indicated by the arrow b1. On the other hand, when the sensor pulley 25 connected by the timing belt 24 is rotated by the first motor 61, the first rotation gear 2, which is connected to the center pulley gear 25b, rotates in the opposite direction, and the first reel stand relay gear 29 is disengaged. Then, it begins to rotate coaxially with the center pulley in the direction of arrow b4, integrally with the first idler arm 27, and meshes with the first reel stand relay gear 30,
Rotate the supply side reel stand in the direction of arrow b3. Then, the magnetic tape transferred by the reverse rotation of the capstan 23 begins to be wound onto the supply tape reel 18.

During this period, due to the reverse rotation of the capstan 23, from the moment when the tape is transferred in the reverse direction, the first rotation gear 28 meshes with the first reel stand relay gear 30, and drives the tape reel 18 in reverse rotation to magnetically A time delay occurs until the tape 64 is wound. During this time, a winding failure of the magnetic tape occurs and the tape becomes slack. Therefore, the magnetic tape 54 momentarily comes out of contact with the cylinder 20 having a rotating head, and becomes like the magnetic tape 64 shown in FIG. It becomes impossible to read with the rotary head that has the rotary head. Therefore, it becomes impossible to reproduce the recorded signal in the section where the magnetic tape is slack, and noise occurs on the reproduction screen of the television.

Next, a description will be given of a brake release mechanism that releases the back tension applying mechanism when the magnetic tape runs in the reverse direction to establish a supply side reel stand drive mechanism using the first motor.

FIG. 8 shows the back tension applying mechanism when the magnetic tape 64 is running in the forward direction 81.

Normally, in a magnetic recording and reproducing device such as a VTR, a magnetic tape 64 is used to ensure that signals are recorded and reproduced between the magnetic tape 54 wound around the cylinder 20 and the rotary head of the cylinder 2o. There is a back tensioning mechanism that provides an appropriate amount of tension. When traveling in the forward direction, the magnetic tape 54 travels while contacting a tension arm 60 that is attached to a tension arm 62 that is rotatably attached to a shaft 72 that is attached to a chassis substrate 60 . On the other hand, the supply side reel stand 32 is given a braking force by a spring 63 attached to the tension arm 62 and a tension band 61 whose end is rotatably attached to the tension arm 62. When the magnetic tape 64 is running in the forward direction, when the tape tension increases beyond the appropriate value, the magnetic tape 64 presses the tension post 60 due to the tension, causing the tension arm 62 to rotate in the 01 direction, and the supply side reel stand 32 Since the tension of the tension band 61 wound around the magnetic tape 64 becomes loose, the braking force applied to the supply reel stand 32 by the tension band 61 decreases, and the back tension of the magnetic tape 64 decreases. Conversely, when the magnetic tape 54 is running in the forward direction, if the tape tension decreases below the appropriate value, the tension arm 62 rotates in the 02 direction due to the force of the spring 63.
Since the tension of the tension band 61 wound around the supply side reel stand 32 increases, the braking force applied to the supply side reel stand 32 by the tension band 61 increases, and the backing of the magnetic tape 64 is increased. Tension increases. In other words, the back tensicon applying mechanism is the spring 63
This is a tension servo system that automatically attempts to approach the proper value when the back tension of the magnetic tape 64 increases or decreases from the proper value set by.

When the magnetic tape 64 runs in the reverse direction, the above-mentioned back tension controller is used in order to wind the magnetic tape 64 transferred in the reverse direction by the capstan 23 onto the supply reel stand 32 in cooperation with the pinch roller 45. It is necessary to release the braking force applied to the supply reel stand 32 by the applying mechanism to make the supply reel stand 32 freely rotatable. FIG. 9 shows the brake released state when the magnetic tape 64 runs in the reverse direction.

Next, with reference to FIGS. 9 and 10, a method of releasing the braking force applied to the supply reel stand when the magnetic tape runs in the forward direction will be described. FIG. 10(G) shows the main lever 65 when the magnetic tape is running in the forward direction. Release arm 6
4 and the tension arm 62. FIG. 10(A) shows the positional relationship between the magnetic tape and the tension arm 62 when the magnetic tape is running in the reverse direction.

Before the magnetic tape shifts from running in the forward direction to running in the reverse direction, the braking force applied to the supply side reel stand 32 is released by the first motor 61 as shown in FIG. 10(A). When a reverse direction travel command is issued during forward direction travel as shown in FIG. ．． Center pulley 26° gear A69. Gear C71 via gear B70i
It is transmitted to First motor 51 transmitted to gear C71
The rotational driving force in the positive direction is generated by the main cams 68 that mesh with each other.
The cam follower 67, which is rotatably mounted on the same axis as the main cam 68, is rotated in the C direction by a cam formed on the end surface of the main cam e8, and the rotational movement of the main cam 68 is transmitted to the cam follower. The main lever 6 engages with the cam follower 67 by interposing the main lever 67.
6 is converted into a linear motion in the C direction. The forward rotation of the first motor 61 continues until the main lever 66 reaches a predetermined position (broken line in FIG. 10(A)) and a switch (not shown) is detected. At the same time, the first motor 51 is reversed.

The reverse driving force of the first motor 51 is converted into a linear movement of the main lever 65 in the d direction along the same path as described above. The rotational driving force in the opposite direction of the first motor 61 is transmitted to the main lever 65 until the operation of the clutch mechanism (not shown) built in the gear B70 is released again. When the position shown is reached, the cam portion 65a of the main lever 66 presses the pin 64& implanted in the release arm 64 in the direction d. The pressing force of the cam surface 65a of the main lever 66 on the bottle 64a in the d direction becomes a rotational force in the forward direction of the release arm 64, presses the end surface 62a of the tension arm 62 in the C direction, and releases the supply fill.
'Tension band 6 wound around J-ru base 32
1, it becomes possible to make the supply side reel stand 32 rotatable.

In this way, in order to switch the magnetic tape 54 from running in the forward direction to running in the reverse direction, as described above, the supply side reel stand 3
In the above configuration in which the only motor 61 is used to transport and wind the magnetic tape and to change the mode, it is necessary to release the tension band 61 wound on the supply side reel stand. It is essential to release the magnetic tape, and it takes a long time to switch from running the magnetic tape in the forward direction to running in the reverse direction.As shown in Figure 7, the tape sag occurs, making it impossible to obtain a reproduced image. It was an inconvenience. Furthermore, in order to release the tension band wound around the supply side reel stand, gear A
69. Gear B70. Gear C71° Main cam θ8. Cam follower arm 67, main lever 65. This required a complex series of configurations for the release arm 64.

Problems to be Solved by the Invention As mentioned above, in the magnetic recording and reproducing apparatus shown in FIG. When the magnetic tape is rotated in the opposite direction to transfer the magnetic tape in the reverse direction and the magnetic tape is transferred to the reverse direction playback mode, it takes time to switch to the reverse direction playback mode, resulting in a problem that a playback signal is lost. Particularly during slow-motion playback and frame-by-frame playback, when reversing from the forward direction to the reverse direction, a phenomenon occurs in the playback image in which at least several fields of the playback signal are completely lost, which becomes a major hindrance to tape editing work, etc. was.

Furthermore, as shown in FIGS. 8 to 10, it takes time to release the tension band wound around the supply reel base to enable switching from forward running of the tape to reverse running of the tape. Not only is the response quick, but complex Ill, +
It had the disadvantage of requiring seven generations.

In view of the above-mentioned problems, the present invention provides a second motor, a second reel stand drive mechanism, and a second pre-release mechanism, so that when the magnetic tape is transferred from the forward direction playback mode to the reverse direction playback mode. In addition to completely eliminating the playback signal loss caused by slack in the magnetic tape, it also enables a simple configuration to effectively release the braking of the supply reel stand necessary for the mode transition described above, which enables high-response reverse playback. The present invention provides a magnetic recording and reproducing device that can shift to a directional reproducing mode.

In order to solve the second problem, the magnetic recording/reproducing device of the present invention cooperates with a pinch roller to unwind the magnetic tape while the magnetic tape is wound around a cylinder at a loading point and a stop. a capstan that runs the magnetic tape in the forward and reverse directions; a first motor that rotationally drives the capstan; and a supply reel that engages a pair of tape reels on which magnetic tape is wound in the tape cassette. a first reel stand drive mechanism that transmits rotational driving force by a first motor to the take-up reel stand when the magnetic tape runs in the forward direction; a back tensicon applying mechanism that applies a pack tensicon to the magnetic tape during running; and a second mechanism that transmits rotational driving force to the supply side reel stand when the magnetic tape is running in the reverse direction.
a second motor that rotationally drives the second reel stand drive mechanism, and a second motor that drives the reel stand of YS2 by releasing the back tension fine mechanism when the i:+i magnetic tape runs in the reverse direction. [Mechanism]j'4.

Operation of the present invention is based on configuration 111) described above. When in the forward playback mode in which the magnetic tape is transferred in all forward directions with the pinch roller pressed against the capstan, the first reel stand drive mechanism moves the reel stand on the take-up side. to drive.

Then, when the capstan is reversed to shift to reverse playback, the first motor is stopped to stop the capstan, and the instantaneous still mode is set. 01J
In the still mode, the supply side reel stand is wound and driven by the second moku and the second reel stand drive mechanism. At this time, since the capstan is stopped, the magnetic tape is not fed out. After that moment, the capstan is rotated in the opposite direction to transport the magnetic tape in the opposite direction. Thereafter, the magnetic tape is wound onto the supply side IJ-roll stand by the second reel stand drive mechanism. In this way, it is possible to eliminate tape slack due to poor tape winding that occurs in conventional devices when the magnetic tape moves from forward direction to reverse direction. In addition, since the second motor that drives and rotates the second reel stand drive mechanism releases the tension band wound around the supply side reel stand, it is synchronized with the start of rotation of the second motor. Since the brake on the supply side reel stand can be released quickly, it is possible to shift to the reverse playback mode with good response.

Embodiments Hereinafter, magnetic recording and reproducing apparatuses according to embodiments of the present invention will be described with reference to the drawings.

1 to 5 show an explanation of each operation of the embodiment of the present invention. In FIGS. 1 to 5, 51 is a first motor, which is a so-called capstan DD motor that is integrally constructed with the capstan 23. Power from a first motor disposed on the back surface of the steering board 6o is transmitted to a center pulley 25 by a timing belt 24. A center pulley gear 26b is attached to the center pulley 26 via a friction member such as felt, coaxially in pressure contact with the center pulley 26 by an elastic member, and the center pulley 26 and center pulley gear 25b are It constitutes a torque limiter and blocks transmission of rotational torque exceeding a certain level between the center pulley 26 and the center pulley gear 26b. Center pulley gear 26b
The rotational driving force is transmitted by the first idler arm 27 and the first rotary gear 28 attached to it to the take-up side reel stand 31 via the first reel stand relay gear 29.
The power is transmitted to the reel base to drive the reel stand.

The center pulley 26. center pulley gear 26b,
First idler arm 27. First transfer gear 28, first reel stand relay gear 29, and take-up side reel stand 31
constitutes a first reel drive mechanism.

Reference numeral 1 designates a second motor, which is attached to the rear of the chassis via a metal fitting 11. The rotational driving force decelerated by the worm 2 is transmitted to the second pulley 6 via the timing belt 4 arranged on the back surface of the chassis. As shown in the cross-sectional view of Fig. 2 e7), the second pulley 5
A gear 16 is press-fitted into the shaft 9 and rotates together with the shaft 9 as the center of rotation, thereby forming a driving wheel member. The second pulley gear 14 includes a driven wheel member t, and a spring 13 coaxially connected to the second pulley via a friction member such as a felt 43.
It is attached in pressure contact with the end surface of the gear 16 by an elastic member such as the like. When the rotational torque exceeds a certain level, a slip occurs between the second pulley gear 14 and the gear 16, and the torque transmission between the second pulley 6 and the second pulley gear 14 is limited, and the torque limiter mechanism It consists of The rotational driving force of the second pulley gear 14 is transmitted to the second idler arm 6 and the 20th rotary gear 7 attached thereto.
The supply side reel stand 32 is thereby driven. The torque limiter mechanism constituted by the second pulley 6, the second idler arm 6, the second rolling gear 7, and the supply reel stand 32 constitute a second reel stand drive mechanism.

In FIG. 1, the magnetic tape 54 in the tape cassette 17 is pulled out to the outside of the tape cassette, the magnetic tape is attached to the rotary head of the cylinder 20, the magnetic tape 64 is sandwiched between the capstan 23, and the pinch roller 45 is FIG. 3 is a state diagram when the tape is transferred in the forward direction (arrow a1) in a state in which the magnetic tape is crimped, and signals recorded on the magnetic tape are being reproduced in the forward direction. At the same time as the capstan 23 feeds out the magnetic tape (in the direction of arrow a1), the first rolling gear 28 engages with the first reel stand relay gear 29 to drive the take-up reel stand 31. , the magnetic tape 64 is wound onto the tape reel 19. In addition, from the tape reel 18, the capstan 23 and the pinch roller 46
The magnetic tape 54 pulled out by the tape cassette inner post 92a and the tape cassette inner post 92b'i
After that, Tension Boss SO, P1 Bonuto 91. Full width erase head 90. It has a tape path that reaches the cylinder 20 via the S side tape post.

The transition of the operation mode from tape forward transport to reverse tape transport will be described below.

In FIG. 3, the first motor 61 is stopped and at the same time the capstan 23 is stopped to set the still mode. Next, in this still mode, the second motor 1
is rotated and moved from the position shown in FIG. As a result, the supply reel stand 32 is entirely rotated in the direction of arrow b3.Thereby, the tape reel 18 engaged with the supply reel stand 32 is caused to take up the magnetic tape 54.At this time, the capstan stops. Therefore, the tape is not fed out.The winding torque of the supply side reel stand 32 that winds the tape reel 18 is determined by the torque limiter formed between the second pulley 6 and the second pulley gear 14 described above. If the winding torque required for winding the tape reel is larger than the torque limiter value set above, the second pulley 6 and the second pulley gear 14 Since slipping occurs between the tapes, problems such as abnormally high tape tension and tape damage do not occur.

Next, FIG. 4 shows the state immediately after the supply side reel stand is driven by the second reel stand drive mechanism as shown in FIG. 3. In FIG. 4, the first motor 51 is rotated in the reverse direction, the capstan 23 is rotated in the direction shown by the arrow b2, and the magnetic tape 64 is reversely transported in the direction shown by the arrow b1.

At this time, the transferred tape is wound onto the lower reel 18 by the second reel stand drive mechanism driven by the second motor 1 without causing tape slack. Simultaneously with the reverse rotation of the first motor 51, the first rotary gear 28 disengages from the first reel stand relay gear 29 and begins to rotate in the direction of arrow b4.

Thereafter, when the capstan 23 rotates in the direction of arrow b22, it is held at the position shown in FIG. 4. In this way, the first reel stand drive mechanism is locked in a state in which it cannot transmit rotational driving force to the supply side reel stand. During this time, the magnetic tape 64 fed out by the reverse rotation of the capstan (in the direction of arrow b2) is wound onto the tape reel 18 by the second reel stand drive mechanism driven by the second motor 1, as described above. . By the operations shown in FIGS. 1 to 4N above, the magnetic tape can be transferred in the forward direction (from multi-feed to reverse direction) without causing any slack in the magnetic tape while keeping the pinch roller 45 pressed against the capstan 23. .

Next, by the rotation of the second motor 1, the tension band 61 wound around the supply side reel stand 32 is released, which is performed in synchronization with the winding of the supply side reel stand 32 by the second reel stand drive mechanism. We will explain the operation of . Reference numeral 80 denotes a telescope gear that meshes with the second pulley 5. As shown in the cross-sectional view of FIG. 2(a), a sleeve 81 is press-fitted into the tension gear 80 and rotates as a unit around a shaft 84 implanted in the chassis 5o, thereby driving the second driving wheel. Configure the member. The rotating arm 82 constitutes a driven wheel member, and is mounted coaxially with the tension gear 8o through a friction member such as a felt 86 and in pressure contact with the end surface of the sleeve 81 by an elastic member such as a spring 86. . - When the rotational torque exceeds the chamber, the sleeve 81 and the rotating arm 8
As a result, torque transmission between the tension gear 80 and the rotating arm 82 is limited. In this way, a torque limiter mechanism is constructed. Rotating arm 8
A release lever 83 that engages with an opening 82a of a rotating arm 82 and a pin 83b is rotatably mounted on the same IwB as 2, and a pin 83a provided on one end surface of the release lever 83 is Chassis M: Plate s.

It is configured to be inserted into a hole 50a provided in the hole 50a.

The rotational driving force of the second pulley 6 is generated by a tension gear 80, a sleeve 81. Felt 86. Appropriate torque is applied to the rotating arm 82 through a torque limit mechanism constituted by a spring 86, etc.
is transmitted, and the pin portion 83a rotates the tension arm 62 in the q direction via the release lever 83, thereby releasing the tension band θ1 wound around the supply side reel stand 32.

The four-motion arm 82 and release lever 83 of the torque limiter mechanism 1 formed by f'+■ in the above-mentioned tension gear 80 and the hole 50a in the chassis board constitute a second brake release mechanism. The operation of releasing the brake will be explained in conjunction with the mode transition from forward tape transport to reverse tape transport.

Following the same route as already described for the second reel stand drive mechanism, in FIG. 3, the first motor 51 is stopped and at the same time the capstan 23 is stopped to set the null mode. Next, in this null mode, the second motor 1 is rotated and the worm 2. Timing belt 4. The tension arm 6 shown in FIG. 3 is moved from the position shown in FIG.
2 is Tensilon Bant S 1 *supplied fl+ IJ −/
Move it from the L/stand 32 to a position where it can be released. The subsequent rotational driving force of the second motor 1 is absorbed by the torque limiter mechanism composed of the tension gear 80 and the like, so that the pin portion 83a of the release lever 83 is connected to the chassis board 60.
The state in which the supply side reel stand 32 is in contact with the end surface sob of the hole 50a is continuously ensured, and the brake release state of the supply side reel stand 32 is reliably maintained while the second motor 1 is rotating. To achieve the above brake release, tension post)
60 is rotated in the direction of arrow q from the position shown in FIG. 1 and brought to the position shown in FIG. The reduction in the length of the tape path caused by the rotation of the tension post is wound onto the tape reel 18 by the already explained second reel stand drive mechanism without causing any slack in the tape.

By the operation shown in FIGS. 1 to 4 above, the pinch roller 4
5 was crimped onto capstan 23! The magnetic tape can be switched from forward direction transfer to reverse direction transfer within about 1 second with good response without causing any slack in the magnetic tape.

At this time, the magnetic tape 64 fed out in the opposite direction by the capstan 23 and the pinch roller 46 is transferred to the cylinder 20. S side tape post 21a.

Full width erase head 90. P1 post 91. Tension post 60. Tape cassette inner post 92a.

The tape is wound onto the ten reel 18 via the tape cassette inner tube 92b. At this time, the magnetic tape 64 does not come into contact with the p1 post 91 because it passes through the tension boss (60) installed on the tension arm 62 released by the second brake release mechanism.

Next, a description will be given of the operation of switching the magnetic tape in the reverse direction to the still mode shown in FIG. In FIG. 4, the capstan 23 is stopped and the still mode is set. In the meantime, the second motor 1 is rotated in the reverse direction, and the second idler arm 6 is moved from the position shown in FIG. Rotate to the position where the mesh separates. Simultaneously with this operation, the release lever 83 is rotated from the position shown in FIG. 4 in the h direction as shown in FIG. 6 to release the second brake release mechanism.
A braking force is again applied to the supply side reel stand 32 by the tensicon band 61, thereby establishing a pack tensilan applying mechanism when the magnetic tape runs in the forward direction. Due to the above operation, the supply side reel stand 32 is disengaged from the second reel stand drive mechanism, and depending on the amount of magnetic tape wound onto the tape reel 8, the magnetic tape is The tape 54 is slightly rotated in the direction in which it is wound in the forward direction. However, the tension post 6o is biased by the spring 63 so as to rotate in the direction of contacting the tape. Therefore, in response to the tape feeding due to the rotation of the quick puller 8 due to the above operation, the tension post 60 rotates from the position shown in FIG. 4 to the position shown in FIG. 6 in the h direction while contacting the magnetic tape 54. . This prevents the magnetic tape from sagging. Thereafter, the rotation of the second motor 1 is stopped and the still mode continues.

Next, to switch to the forward playback mode, simply rotate the capstan in the a2 direction as shown in Figure 1.Also, when switching from the reverse playback mode to the forward playback mode, the above-mentioned still By passing the mode instantaneously,
It is possible to switch in a short time of about 1 second or less.

In this way, while the pinch roller remains pressed against the capstan, it is possible to instantly switch from forward direction transport to reverse direction transport without causing any slack in the magnetic tape.

In a conventional device in which a capstan and a pair of reel stands are driven by a single motor, the magnetic tape can be switched from forward playback mode to reverse playback mode while the pinch roller remains pressed against the capstan. When switching, the only motor needed to first release the tension band wound around the supply reel stand, which resulted in poor response when switching modes from forward to reverse. , the playback signal was missing. On the other hand, there was a device in which the capstan and a pair of reel stands were driven by a Kawasaki motor, but in this way, the motor that drove the reel stand could be driven by the same motor that drove the capstan. High-precision control was required, and the motor itself required an expensive motor with performance that would not adversely affect the important characteristics of wow and jitter.

Furthermore, in order to switch between forward and reverse with good response, it is necessary to release the brake on the supply reel stand instantaneously when the mode changes from the forward direction to the reverse direction. For example, it is necessary to use a separate power source such as a solenoid. Therefore, it is necessary to operate the device in synchronization with the winding of the supply reel stand, resulting in an expensive and complicated device.

However, according to the present invention, a relatively inexpensive second motor (for example, a brushed motor with a core), a second reel stand drive mechanism using the second motor as a power source, and a second It is only necessary to provide a brake release mechanism,
Forward and reverse slow motion.

When switching between forward/reverse frame-by-frame forwarding, forward/reverse playback mode, and forward/reverse fast-forward 7-speed mode, high tension is applied to the magnetic tape to instantly obtain playback images with good response and no playback signal loss, without damaging the tape. It is possible to easily realize a special playback mechanism that can perform the following functions.

In addition, the torque limiter mechanism constituted by a tension gear etc. which constitutes the second brake release mechanism shown in this embodiment is replaced by the torque limiter mechanism constituted by the second center pulley gear 14 etc. which constitutes the second reel stand drive mechanism. It is also possible to use a limiter mechanism instead.

Effects of the Invention As described above, according to the present invention, a capstan and a capstan that work together with a pinch roller to run the magnetic tape in the forward and reverse directions with the magnetic tape wound around the cylinder at the loading post are provided. , a first motor that rotates the capstan, a supply side reel unit and a take-up side reel unit that engage a pair of tape reels around which magnetic tape is wound in a tape cassette, and a first motor that rotates the capstan; a first reel stand drive mechanism that transmits multi-rotational driving force to the take-up reel stand to the first motor when the tape is running in the forward direction; and a back tension is applied to the magnetic tension when the magnetic tape is running in the forward direction. a second reel stand drive mechanism that transmits rotational driving force to the supply side reel stand when the magnetic tape runs in the reverse direction; and a second reel stand drive mechanism that drives the second reel stand drive mechanism in full rotation. motor and 1]1
1. A second brake release mechanism that releases the puncture tension applying mechanism and establishes a second reel stand drive mechanism when the magnetic tape runs in the reverse direction, enables the magnetic tape to be corrected. When shifting from a forward playback mode using directional transport to a reverse playback mode using reverse transport, the transition can be made quickly, without causing any slack in the magnetic tape, and thus allowing forward and reverse fast forwarding,
It is possible to realize an excellent magnetic recording and reproducing device that can obtain reproduced images without signal loss without damaging the magnetic tape during playback in forward/reverse slow motion, forward/reverse frame-by-frame forwarding, or forward/reverse playback modes. be.

4. Drawing Section I1. 1 is a plan view showing an embodiment of the magnetic recording and reproducing apparatus of the present invention, and FIG. (A) is a sectional view of the main part showing the brake release mechanism of the present embodiment, and (T) is (G).

(A) is a plan view of the main part showing the mechanism, FIGS. 3 to 6 are plan views showing the operation of the same embodiment of the present invention, and FIGS. 6 to 9 are plan views showing the operation of the conventional magnetic recording and reproducing device. A plan view showing,
FIGS. 10(0) and 10(a) are plan views of essential parts showing a brake release mechanism of a conventional magnetic recording/reproducing device.

1...Second motor, 6.Old...Second center pulley, 6...Second idler arm, 7
...Second rotary gear, 14...Second center pulley gear, 17...Tape cassette, 18.19...Ten reel, 23.・・・・・・
・Gear Punutan, 51...First motor, 3
1.32... Reel stand, 27... First idler arm, 54... Magnetic tape.

Name of agent: Patent attorney Shigetaka Awano and 1 other person figure thread figure (less than ? bow Wa Condolences figure ? child No. figure center figure No. figure

Claims (1)

[Claims] a capstan that runs the magnetic tape in a forward direction and in a reverse direction in cooperation with a pinch roller while the magnetic tape is wound around a cylinder on a loading post; a first motor that rotationally drives the capstan; A supply reel stand and a take-up reel stand that engage a pair of tape reels wound with magnetic tape in a tape cassette, and a first motor on the take-up reel stand when the magnetic tape runs in the forward direction. a first reel stand drive mechanism that transmits rotational driving force by a first reel stand drive mechanism; a back tension applying mechanism that applies back tension to the magnetic tape when the magnetic tape runs in the forward direction; and a back tension applying mechanism that applies back tension to the magnetic tape when the magnetic tape runs in the reverse direction; a second reel stand drive mechanism that transmits rotational driving force to the stand; and a second reel stand drive mechanism that rotationally drives the second reel stand drive mechanism.
a motor, and a brake release mechanism that releases the back tension applying mechanism to enable operation by the second reel stand drive mechanism when the magnetic tape runs in the reverse direction, and the second reel drive mechanism is operated by the second motor. A magnetic recording/reproducing device characterized by operating a stand drive mechanism and a brake release mechanism.