JPH01269266A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To obtain a magnetic recording and reproducing device which is economic and highly reliable by detecting the revolving direction of a winding reel in a condition that a magnetic tape is sandwiched between a capstan and a pinch roller and applying load brake to the winding reel only when the tape is capstan-driven in a reverse direction. CONSTITUTION:Regular and reverse revolution can be executed for a capstan motor 4 and a magnetic tape 20 can be moved in regular and reverse directions. By a mode switching mechanism, a stop mode, a first mode to sandwich the tape 20 between a capstan 5a and a pinch roller 19 and a second mode to release the sandwiching and to send the tape at a high speed are selected. A driving force transmitting mechanism selectively transmits power to a supplying reel 2 and a winding reel 3 in correspondence to the revolving direction of the capstan motor 4. A load brake applying part 17 adds the brake to the winding reel 3 only when the tape is driven in the reverse direction. Thus, mechanism operation for brake giving member drive in the first mode is eliminated, and the recording and reproducing device, which is economic and highly reliable, can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic recording/reproducing device using a magnetic tape as a recording medium, and particularly to a mechanism for applying back tension to a running magnetic tape.

[Conventional technology]

In a magnetic recording/reproducing device, a mode in which a magnetic tape is fed from a supply reel and wound on a take-up reel for recording or reproduction (hereinafter referred to as normal running mode, and does not include fast-forward mode) Not only that, but also in a mode in which the magnetic tape is fed out from the take-up reel and wound on the supply reel for reverse playback (hereinafter referred to as the reverse run mode, and does not include the high-speed rewind mode), Back tension is applied to the magnetic tape in order to prevent the magnetic tape from loosening and to obtain a desired tape tension.

In order to apply back tension during reverse running, a load brake is applied to the take-up reel stand, which is the reel on the unwinding side of the magnetic tape, but this load brake is applied by activating the load brake with a solenoid etc. The method is to keep a load brake in pressure contact with the take-up reel stand at all times, and during normal rotation mode, the take-up reel stand, which has an extra load due to the load brake, is rotated to wind the magnetic tape onto the take-up reel. The method is known.

Another method for applying a load brake to the take-up reel table is that in magnetic recording and reproducing devices, a mechanism consisting of a cam or a lever is normally used to set each mode, and a drive motor is used to control the state of this mechanism. Each mode is set by switching the A method is also known in which a load brake is applied to the take-up reel stand along with mode setting.

[Problem to be solved by the invention]

However, in the above method using a solenoid, when applying a load brake to the take-up reel stand, electric power is required to drive the solenoid during the application period, which poses a problem in terms of power consumption. , it is impractical from the point of view of reliability and economy.

In addition, in the above-mentioned method of constantly applying a load brake to the take-up reel stand, the load brake is applied to the take-up reel stand even in normal rotation running mode, so the rotational drive of the take-up reel stand in this mode As a result, extra power is required to resist this load brake, and unnecessary power is consumed.
In addition, load braking tends to cause wow and flutter, which is not a good idea from a performance standpoint.

Furthermore, in the above method in which the mechanism is provided with a load brake applying mechanism to the take-up reel stand, it is only necessary to supply power to the drive motor when changing the state of the mechanism for mode transition; Since the load brake can be applied to the reel stand and the load brake can be released from the take-up reel stand when in normal rotation mode, it is advantageous in terms of power consumption, performance, reliability, and economy compared to the previous two methods. .

By the way, video tape recorders (hereinafter referred to as VTRs) often perform splicing, in which new recording is performed following an already recorded portion of a magnetic tape, but in this case,
In order to accurately align the track between the previously recorded area and the newly recorded area, once recording is complete, a mechanism shifts from forward running mode to reverse running mode and the magnetic tape is rotated slightly. After being rewound, the magnetic tape is stopped, and when recording starts next time, the mechanism switches to forward running mode, and the head moves to the track that has already been recorded in the rewound section. Tracking control is performed to scan the top, and recording by this head is started following the last recording track.

In this way, during continuous shooting, recording is stopped and the magnetic tape is rewound a small amount, during which time a load brake is applied to the take-up reel stand. In order to shift to the running mode, the drive motor, that is, the loading motor
Start and stop times. If you simply want to rewind the magnetic tape a small amount after stopping recording, you can simply rotate the capstan motor in reverse while the magnetic tape is held between the capstan and the pinch roller. Since the brake must be applied and the mechanism for applying the brake is operated by mode transition of the mechanism, the loading motor must be started and stopped for this purpose.

Therefore, it takes a certain amount of time for the mechanism to switch modes, and for this reason, if you want to start the next recording immediately after stopping recording, there is a problem that there will be a delay in starting the next recording. There are also problems like.

That is, in recent years, camera-integrated VTRs have become available which have a so-called interval recording function that repeats short-term recording and pause. This recording method compresses the time axis of changes in phenomena over a long period of time so that they can be observed in a short time, and is equivalent to the time-lapse photography seen in documentary films. This recording method also uses the above-mentioned continuous shooting method, and after recording for a predetermined period of time, the mode is set to a pause mode, and then the magnetic tape is rewound slightly and the mode is set to the -time stop mode again. Then, in the next recording, tracking control is performed on the rewound portion, and a new track that is accurately aligned with the already recorded track is recorded.

In this way, interval recording involves repeating continuous shooting, but as mentioned above, recording and rewinding of the magnetic tape are performed once each in one continuous shooting, so the load brake from the take-up reel stand is It is necessary to release the load brake once and apply the load brake to the take-up reel stand, and therefore the loading motor is started and stopped twice. On the other hand, in interval recording, recording of several frames or about one second and long pauses of about one minute are usually repeated. The number of continuous shots exceeded several thousand times, and the loading motor started.

There is a possibility that the number of stops will be enormous, leading to problems with durability.

The object of the present invention is to solve such problems and to apply a load brake to the take-up reel stand without changing the mode of the mechanism.
An object of the present invention is to provide a magnetic recording/reproducing device that enables release.

[Means to solve the problem]

In order to achieve the above object, the present invention enables a capstan motor to rotate in forward and reverse directions to move a magnetic tape in forward and reverse directions, and a stop mode and a stop mode in which a magnetic tape is held between a capstan and a pinch roller. a mode switching mechanism between a first mode and a second mode for separating the pinch roller from the capstan and feeding the magnetic tape at high speed; and supplying rotation of the capstan motor in accordance with the rotation direction of the capstan motor. a driving force transmission mechanism that selectively transmits power to the reel stand and the take-up reel stand; and a drive force transmission mechanism that operates in a first mode to detect the rotational direction of the take-up reel stand and drive the magnetic tape in the opposite direction by a capstan. A load brake applying member for applying a predetermined load brake to the take-up reel stand is provided only when the load brake is applied.

[Effect]

Whether the magnetic tape is driven by a capstan or by a reel is determined by a mode switching mechanism, and the running direction of the magnetic tape is determined by the rotating direction of the capstan motor.

Therefore, when simply switching the running direction of the magnetic tape, the mode switching mechanism does not operate. This mode switching mechanism forms part of the mechanism described above, so that the drive motor of the mechanism is not activated.

The load brake applying member acts in the first mode, detects the rotational direction of the take-up reel stand in the first mode, and applies a predetermined load brake to the take-up reel stand only in the reverse running mode. is applied, and load braking is not applied to this in normal rotation running mode. In this way, since the action of the load brake application member is made to differ depending on the rotational direction of the take-up reel stand, it is not necessary to operate the mechanism for applying the load brake application member in the first mode. .

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view showing a state in a stop mode of an embodiment of the magnetic recording/reproducing apparatus according to the present invention, in which 1 is a chassis, 2 is a supply reel stand, 2a is a reel shaft, and 3 is a take-up reel stand. , 3a is a reel shaft, 3b is a crimping plate, 4 is a DD (direct drive) capstan motor, 5 is a pulley, 5a
is a capstan, 6a is a shaft, 7 is a drive gear, 8 is a fixed shaft, 9 is an idler arm, 9a is a shaft, 10 is an idler gear, 11a, llb are relay gears, 12a, 12b are brake arms, 13 is a support shaft, 14 is a cam arm, 15 is a switching arm, 16a, 16b are support shafts, 17 is a load brake applying member, 18 is a pinch roller arm, 19 is a pinch roller, 20 is a magnetic tape, 21 is a head cylinder, 22a
, 22b is a tape guide, 23a and 23b are stoppers,
24 is an audio/control head, and 25a and 25b are guide grooves.

In the figure, a pair of reel shafts 2a and 3 are mounted on a chassis 1.
A is planted, and a supply reel stand 22 and a take-up reel stand 3 are rotatably attached to each of them.

The supply reel stand 21 and the take-up reel stand 3 are provided with a gear section, and the gear section of the supply reel stand 2 includes a relay gear lla rotatably attached to a support shaft 16a implanted in the chassis 1. The gear part of the take-up reel stand 3 has the chassis 1
Relay gears Ilb rotatably attached to support shafts 16b implanted in each mesh with each other. These support shafts 16a, 1
6b are arranged symmetrically with respect to the perpendicular bisector of the straight line connecting the reel axes 2a and 2b.

A fixed shaft 8 is installed in the chassis 1 so as to be on this perpendicular bisector, and a drive gear 7 is provided on the fixed shaft 8 so as to be rotatable and slidable in the axial direction. An idler arm 9 is rotatably attached to 8. An idler gear 10 is rotatably provided on a shaft 9a implanted at the tip of the idler arm 9, and the idler gear 10 meshes with the drive gear 7. The drive gear 7 is
It is slid in the axial direction of the fixed shaft 8 by a switching arm 15 attached to the support shaft 13 and rotatable in a plane perpendicular to the plane of the paper.

The capstan motor 4 includes a capstan 5a and a pulley 5.
A belt (not shown) is stretched between this Boo+J 5 and a pulley gear (not shown) rotatably attached to a shaft 6a implanted in the chassis 1. This pulley gear also meshes with the drive gear 7.

The above constitutes a driving force transmission mechanism between the supply reel stand 21 and the take-up reel stand 3 using the capstan motor 4 as the driving force source, and as the idler arm 9 rotates, the idler gear 10 rotates in the forward rotation mode. The take-up reel stand 3 is driven to rotate by meshing with the relay gear llb, and in the reverse running mode, the idler gear 10 is meshed with the relay gear lla to drive the supply reel stand 2 to rotate. In the stop mode, as shown, the idler gear 10 is released from the relay gears lla, llb, and the brake arms 12a, 12b apply the brakes to the relay gears lla, llb.

As will be described later, the state of the mechanism for setting each mode of the magnetic recording/reproducing device is switched by a cam gear rotationally driven by a loading motor, and the cam arm 14. The pinch roller arm 18 and the like operate to pinch and release the magnetic tape 20 between the capstan 5a and the pinch roller 19, but the forward running mode and reverse running mode are determined by the rotating direction of the capstan motor 4, and the magnetic tape 20 is stopped. Cam arm 14 for switching between modes, fast forward and fast rewind modes, and other modes. A pinch roller arm 18 or the like is used. That is, even when the magnetic tape 20 is held between the capstan 5a and the pinch roller 19,
The capstan motor 4 is rotated clockwise (forward direction) in the drawing,
Both can be rotated in the opposite direction (reverse direction), and in the former case, it is during recording and playback mode, and in the latter case, it is used for reverse playback or when the magnetic tape is rotated at the end of recording. It is in return mode. The same applies when the magnetic tape 20 is not held between the capstan 5a and the pinch roller 19, and fast forwarding is performed when the capstan motor 4 rotates in the forward direction, and high speed rewinding is performed when the capstan motor 4 rotates in the reverse direction. Regardless of whether the magnetic tape 20 is in any of the above states, an idler mechanism such as an idler arm 9 or an idler gear 10 causes the capstan motor 4 to
When rotating in the forward direction, the take-up reel stand 3 is rotationally driven, and when rotating in the reverse direction, the supply reel stand 2 is driven to rotate.
Needless to say, it is rotationally driven.

The take-up reel stand 3 is provided with a pressure bonding plate 3b having a ratchet formed on its outer periphery, and a load brake applying member 17 is provided opposite to this pressure bonding plate 3b. This load brake applying member 1
As will be described later, 7 has a member that comes into contact with the take-up reel stand 3 in modes other than fast forwarding and high-speed rewinding modes, and by detecting the rotational direction of the take-up reel stand 3 with this member, the take-up reel stand When the take-up reel stand 3 rotates in the tape winding direction, almost no load brake is applied to it, but when the take-up reel stand 3 rotates in the tape payout direction, the winding is stopped by the action of the ratchet of the crimping plate 3b. A desired load brake is applied to the reel stand 3. In the fast forward and high speed rewind modes, the contact member of the load brake applying member 17 is completely separated from the crimping plate 3b of the take-up reel stand 3 due to the action of the pinch roller arm 18, and the take-up reel stand 3 is completely free of load brakes. It doesn't cost.

As described above, in the normal rotation running mode in which the capstan motor 4 rotates in the normal rotation direction with the magnetic tape 20 being held between the capstan 5a and the pinch roller 19 due to the action of the load brake applying member 17, the take-up reel stand 3 is rotated in the tape winding direction with almost no load brake applied, and in the same reverse running mode, the supply reel stand 2 is rotationally driven in the tape winding direction, and the load brake applying member 17 A desired load brake is applied to the reel stand 3. In switching between this forward running mode and reverse running mode, simply operate the capstan motor 4.
The rotation direction of is changed, the idler arm 9 is rotated, and the relay gears tta and Ilb with which the idler gear 10 meshes are switched, but there is no change in the state of other mechanisms, and therefore, the loading motor is not started.

When a tape cassette (not shown) is installed and is in the stop mode, as shown in the drawing, the tape guide bodies 22a, 2
2b and the capstan 5a are located inside the tape cassette rather than the magnetic tape 20 housed in the tape cassette. Therefore, the operation buttons for recording and playback (
When the loading motor (not shown) is operated, the cam gear (not shown) is rotated, and the brake arms 12a, 12b are separated from the relay gears lla, llb by a release means (not shown) to supply the brakes. Reel stand 21
The brake on the take-up reel stand 3 is released.

At the same time, the tape guides 22a and 22b are connected to the guide groove 2.
5a and 25b, the magnetic tape 20 is pulled out from the tape cassette by being caught by the inclined guides and guide rollers of the tape guides 22a and 22b. Further, as the cam gear rotates, the cam arm 14, the pinch roller arm 18, etc. operate, and the pinch roller 19 approaches the capstan 5a.

In this way, the tape guides 22a and 22b move as the cam gear rotates, and the magnetic tape 20 is loaded. When this loading operation is completed, the magnetic tape 20 is moved toward the head as shown in FIG. The tape is wound spirally around the outer periphery of the cylinder 21 over approximately 180 degrees, and is held between the capstan 5a and the pinch roller 19 to form a tape running path. In this state, when the capstan motor rotates in the normal rotation direction and the capstan 5a rotates in the direction of the arrow, the idler gear 10 rotating in the direction of the arrow shifts to the relay gear l.
lb, and this and the take-up reel stand 3 rotate in the direction of the arrow. At this time, the load brake by the load brake applying member 17 is hardly applied to the take-up reel stand 3.

Also, the magnetic tape 20 is rotated by the rotation of the capstan 5a.
travels in the direction of the arrow, is unwound from a supply reel (not shown) mounted on the supply reel stand 2, and is wound onto a take-up reel (not shown) mounted on the take-up reel stand 3. .

Here, when an operation button (not shown) for the - time stop or reverse playback mode is operated, the loading motor is not started at all and only the rotational direction of the capstan motor 4 is reversed, resulting in a reverse run mode. As a result, the idler gear 10 is switched to the relay gear lla side, and the supply reel stand 2 is rotationally driven in the counterclockwise direction. capstan 5a
rotates in the opposite direction to the arrow, and the magnetic tape 20 travels in the opposite direction to the arrow and is wound onto a supply reel mounted on the supply reel stand 2. For this purpose, the magnetic tape 20 is unwound from the take-up reel mounted on the take-up reel stand 3, and the take-up reel stand 3 rotates in the opposite direction to the arrow. A load brake is applied to the take-up reel stand 3 by the load brake applying means 17.

This operation is performed even in the case of fast forwarding or high speed rewinding, even if the magnetic tape 20 is not loaded.
This is the same except that 0 is not held between the capstan 5a and the pinch roller 19, and the load brake application means 17 is not activated.

In this way, when switching between the forward rotation running mode and the reverse rotation running mode, there is no switching of the state of the mechanism by the loading motor, only the rotation direction of the capstan motor is switched, and the take-up reel stand 3 In this case, the load brake is almost always released during the normal rotation running mode, and the desired load brake is applied during the reverse rotation running mode. Therefore, when you want to start recording again immediately after finishing recording, recording starts immediately in response to this, and interval recording can be performed without starting or stopping the loading motor, which reduces the durability of the loading motor. There are no problems with sexuality.

Next, the configuration and operation of each part in FIG. 1 will be specifically explained.

FIG. 3(a) is a plan view showing the driving force transmission mechanism of the capstan motor, and FIG. 3(b) is a sectional view thereof, in which 6 is a pulley gear, 6b is a boob portion, 6C is a gear portion, 7a, 7
b is a gear, 8a and 8b are stoppers, and 9b.

9C is boss, 10a is felt, 10b is spring, 10c
10d is a spring seat, 10d is a stopper, 14a is a spindle, 14b is a protrusion, 26 is a belt, 27a, 27b are coupling gears, 28a, 28b are gears, 29 is a bearing, 30 is a switching plate, 30a, 30b is a boss, 31 1 is a support shaft, 32 is a torsion spring, and 33 is a locking washer, and parts corresponding to those in FIG. 1 are given the same reference numerals.

In FIG. 3 (al, (bl), the pulley gear 6 rotatably attached to the shaft 6a has a pulley portion 6b and a gear portion 6.
A belt 26 is stretched between the pulley portion 6b and the pulley 5 attached to the capstan motor 4. A drive gear 7 rotatably attached to a fixed shaft 8
has a narrow gear 7a and a wide gear 7b, and the gear 7a has a narrow gear 7a and a wide gear 7b.
is meshed with the gear portion 6c of the pulley gear 6. An idler arm 9 is attached to the fixed shaft 8 so as to be rotatable and slidable in the axial direction, and a shaft 9a is implanted at the tip of the idler arm 9. Further, the fixed shaft 8 is provided with a stopper 8a for regulating the sliding range of the idler arm 9.

8b is provided.

An idler gear 10 is rotatably attached to this shaft 9a with a felt 10a in between.
0 meshes with the wide gear 7b of the drive gear 7. A spring 10b and a spring seat 10c are provided on the idler gear 10, and a stopper 10d attached to the shaft 9a compresses the spring 10b via the spring seat 10c. Therefore, the idler gear 10 is pressed against the idler arm 9 via the felt 10a due to the biasing force of the spring 10b.

The bearing portion of the fixed shaft 8 in the idler arm 9 is provided with bosses 9b from both sides in a direction perpendicular to the fixed shaft 8.

9C stands out. A switching arm 15 is rotatably attached to a support shaft 13 that is held horizontally by a bearing 29.
has two tips, one of which is split into two and loosely engaged with one boss 9C provided on the idler arm 9, and the other tip is also split into two and fitted into one of the bosses 9C provided on the idler arm 9. It is loosely engaged with the other boss 9b.When this switching arm 15 rotates about the support shaft 13, the idler arm 9 slides along the fixed shaft 8.

A switching plate 3 is rotatably attached to a support shaft 31 installed in the chassis 1.
0 is attached. A stop washer 33 is fixed to this support shaft 31, and this stop washer 33 and the switching plate 30
A coil portion of a torsion spring 32 is attached to a support shaft 31 between the two. One end of this torsion spring 32 is fixed to a stop washer 33 or the like, and the other end is shaped like an arm and fixed to the switching arm 15. The switching plate 30 is provided with two bosses 30a and 30b, and these bosses 30a and 30b
The arm portion of the torsion spring 32 passes between them.

Further, a pressing portion is provided on the switching plate 30, and a protrusion 14b is provided on the cam arm in opposition to this.

The cam arm 14 rotates about the spindle 14a along with the rotation of a cam gear (not shown), and this rotation causes the protrusion 14b to push the pressing portion of the switching plate 30, causing the switching plate 30 to rotate clockwise about the spindle 31. . The switching plate 30 is
When not pushed by the protrusion 14b, it is in the state shown by the - dotted chain line in FIG. part is pressed and torsion spring 3
2 is twisted clockwise. The state in which the switching plate 30 is pushed in this way and is in the state shown by the solid line in FIG. 3 (al) is only in the fast forward and high speed rewind modes.

On the other hand, the switching plate 30 is not pushed by the protrusion 14b, and the third
In the state shown by the dashed line in FIG. 3(b), the idler arm 9 is in contact with the stopper 8a provided on the fixed shaft 8 in the direction of arrow A (downward) in FIG. 3(b). When the switching plate 30 is pushed by the protrusion 14b and reaches the state shown by the solid line in FIG. 3(a), the switching plate 30
As the arm portion of the torsion spring 32 is pushed by the boss 30a, the switching arm 15 rotates counterclockwise about the support shaft 13 as shown in FIG. It slides upward in the A' direction and comes into contact with a stopper 8b provided on the fixed shaft 8.

When the operating phase (not shown) for fast forward mode or high speed rewind mode is operated, the cam gear is rotated by the loading motor, the cam arm 14 is rotated in the direction of arrow B (clockwise) about the support shaft 14a, and the switching plate is rotated. 30 is shown in Figure 3 (
It stops in the state shown by the solid line al. therefore,
In FIG. 3 (bl), the idler arm 9 comes into contact with a stopper 8b provided on the fixed shaft 8.

When the operating phase (not shown) for modes other than these, such as recording, playback, and reverse playback, is operated, the loading motor rotates more than in the fast forward and fast rewind modes, and the cam arm 14 also rotates in these modes. It rotates in the direction of arrow B more than when . During this rotation, the protrusion 14b
is removed from the switching plate 30, and the switching plate 30 returns to the state shown by the dashed line in FIG. 3(a) due to the torsional repulsive force of the torsion spring 32. As a result, the arm portion of the torsion spring 32 also -
Since we return to the state shown by the dotted chain line, in Fig. 3(b),
The switching arm 15 rotates clockwise about the support shaft 13,
The idler arm 9 slides on the fixed shaft 8 in the direction of arrow A and comes into contact with the stopper 8a.

When transitioning from the recording, playback, reverse playback mode, etc. to the stop mode, the cam arm 14 rotates in the direction of arrow B' (counterclockwise) about the support shaft 14a due to the rotation of the loading motor in the opposite direction. During this rotation, the protrusion 14b of the cam arm 14 rotates the switching plate 30 counterclockwise about the support shaft 31 from the state shown by the dashed line in FIG. 30b pushes the arm portion of the torsion spring 32, but the switching arm 15
Since it is in contact with the stopper 8a, it cannot rotate further clockwise with respect to the support shaft 13, and the torsion spring 32
is simply twisted counterclockwise about the support shaft 31. When the projection 14b of the cam arm 14 separates from the switching plate 30 in the stop mode, the boss 30b is pushed by the arm portion of the torsion spring 32 due to the torsional repulsive force of the torsion spring 32, and the switching plate 30 moves clockwise with respect to the support shaft 31. It rotates and returns to the state shown by the - dotted chain line in Fig. 3 Ta).

In this manner, when transitioning from a mode such as recording, playback, or reverse playback to a stop mode, the idler arm 9 is maintained downward, that is, in contact with the stopper 8a of the fixed shaft 8.

In the transition from the fast forward or high speed rewind mode to the stop mode, the switching plate 30 changes from the state shown by the solid line in FIG. In FIG. 3 (bl), the idler arm 9 slides on the fixed shaft 8 in the direction of arrow A from the state where it is in contact with the stopper 8b, and comes into the state where it is in contact with the stopper 8a.

Furthermore, as explained earlier, the loading motor does not start when switching between the forward running mode and reverse running mode, which merely changes the running direction of the magnetic tape, or when setting the temporary stop mode. There is no sliding movement of the idler arm 9 on the fixed shaft 8.

Now, the driving force of the capstan motor 4 is transmitted to the driving gear 7 via the belt 26 and the pulley gear 6. Now, if the capstan motor 4 rotates in the normal rotation direction, the drive gear 7 rotates in the counterclockwise direction with respect to the fixed shaft 8. For this reason, the idler gear lO meshed with the gear 7b of the drive gear 7 rotates clockwise about the shaft 9a, but since the idler gear 10 is pressed against the idler arm 9 by the spring 10b via the felt 10a, the idler arm 9 generates the friction torque necessary for swinging,
The idler arm 9 rotates counterclockwise (in the direction of arrow C) about the fixed shaft 8, and the idler gear 10 rotates as a relay gear llb.
mesh with. As a result, the relay gear llb, and thus the take-up reel stand 3 (FIG. 1), are driven to rotate for tape winding. When the capstan motor 4 rotates in the reverse direction, the drive gear 7 rotates clockwise and the idler gear 1
0 rotates counterclockwise, the idler arm 9 rotates clockwise, and the idler gear 10 meshes with the relay gear lla. As a result, the supply reel stand 2 (FIG. 1) is driven to rotate for tape winding.

Relay gear lla is coupling gear 27a and gear 28a
, and the relay gear llb is also a coupling gear 2.
7b and a gear 28b.

When the idler arm 9 is in contact with the stopper 8b of the fixed shaft 8 (fast forward mode, high speed rewind mode) as shown in FIG. 28a and 28b, and the idler arm 9 is in contact with the stopper 8a of the fixed shaft 8 (recorded).

(such as playback, reverse playback, etc., or their pause modes), the idler gear 10 is connected to the relay gear lla,
llb coupling gear 27a.

27b.

4 is a partial sectional view showing the structure of the relay gear 11b1 take-up reel stand 3 in FIG. 1, 3C is a gear, 3d
is a ratchet, 3e is a mounting table, 3'' is a contact surface, 3g is felt, 34 is a compression spring, 35a and 35b are felt,
36 is a spring, 37 is a pressure bonding plate, and 38 is a stopper, and parts corresponding to those in the previous drawings are given the same reference numerals. In addition, in FIG. 4, one relay gear llb and the take-up reel stand 3
However, the other relay gear lla has a similar structure, and the supply reel stand 2 (Fig. 1) uses the conventional method of applying load brake with brake shoes, so the take-up reel It is only slightly different in configuration from pedestal 3.

In FIG. 4, the gear 28b is attached to the support shaft 16b upwardly.
They are each rotatably attached so that the coupling gear 27b is located downward. Further, a fell 35a is provided between the coupling gear 27b and the gear 28b. A stopper 38 is fixed to the tip of the support shaft 16b, and a felt 35b is provided between the stopper 38 and a pressure bonding plate 37 fitted into the gear 28b. Further, a compressed spring 36 is provided between the pressure bonding plate 37 and the gear 28b. By this spring 36, the gear 28b is pressed against the coupling gear 27b via the felt 35a, and the pressure bonding plate 37 is pressed against the stopper 38 via the felt 35b.
is being forced on. Here, gear 28b and crimp plate 3
7 and the friction coefficient thereof is sufficiently large, so that the pressure bonding plate 37 rotates together with the gear 28b. That is, the felt 35b and the pressure bonding plate 37 are used to hold the spring 36 for pressing the gear 28b against the coupling gear 27b via the felt 35a.

The above is the configuration of the relay gear llb, and the take-up reel stand 3
In this case, the crimping plate 3b and the take-up reel are connected to the gear 3C rotatably attached to the reel shaft 3a. ! A mounting table 3e is attached.

The gear 3c meshes with the gear 28b of the relay gear llb, and a felt 3g is provided between the gear 3C and the crimping plate 3b. In addition, a compression spring 34 is provided between the crimping plate 3b and @ placing stand 3e, and when a take-up reel (not shown) is mounted on this placing stand 3e, the pushing of this take-up reel causes the @ placing stand to 3e is slightly lowered and the compression spring 34 is compressed, whereby the pressure bonding plate 3b is pressed against the gear 3C via the felt 3g. The mounting table 3e is gear 3
It is integrated with C. A ratchet 3d is provided on the outer periphery of the crimping plate 3b, and the outer periphery of the mounting table 3e forms a contact surface 3f.

As previously explained with reference to FIG. 3, when the capstan motor rotates in the forward rotation direction and the idler gear 10 is meshed with the coupling gear 27b of the relay gear Ilb (that is, when in a mode such as recording or reproduction) , a coupling torque is generated in the gear 28b by the rotation of the coupling gear 27b due to the felt 35a and the spring 36,
Gear 28b rotates. As a result, the mounting table 3e also rotates, and the magnetic tape is wound onto a take-up reel (see the drawing) placed on the mounting table 3e. In this case, the rotation speed of the coupling gear 27b is set so that the take-up reel is rotated at a rotation speed higher than the rotation speed necessary for winding the tape when the amount of tape wound on the take-up reel is minimum. Therefore, the mounting table 3e rotates at a rotation speed lower than this rotation speed, and as the amount of tape wound on the take-up reel increases, the rotation speed of the mounting table 3e decreases. Therefore, slippage occurs between the coupling gear 27b and the gear 28b via the felt 35a.

Further, as previously explained in FIG. 3, the capstan motor rotates in the forward direction, and the idler gear 10
When meshing with gear 28b of lb (i.e.,
In the fast forward mode), the rotation of the idler gear 10 is directly transmitted to the mounting table 3e via the gear 28b9 and the gear 3C of the take-up reel table 3. For this reason, the mounting table 3e rotates at high speed, and the take-up reel winds up the magnetic tape at high speed.

In the reverse running mode in which the capstan motor runs in the reverse direction, the idler gear 10 does not mesh with either the coupling gear 27b or the gear 28b of the relay gear 11b, and the relay gear llb is released from the drive transmission mechanism of the capstan motor. . At this time, the i! The magnetic tape is unwound from the take-up reel placed on the i3! I unit 3e,
Therefore, although the gear 3C rotates, a brake is applied to the pressure bonding plate 3b due to the action of the load brake applying member 17 (FIG. 1).

As a result, a load brake is applied to the gear 3C1 and therefore the mounting table 3e via the felt 3g. In other words, the gear 3C is about to be stopped by the crimp i3b, but as the tape is fed out from the take-up reel, the mounting device 3e1 and therefore the gear 3C rotate as if being dragged.

Next, in FIGS. 5 to 7, the cam arm 14 in FIG. The operation and drive mechanism of the pinch roller arm 18a will be explained. In addition, in the same figure, 14C,
14d is a pin, 18a is a pin, 18b is a protrusion, 18c is a spring hook, 39 is a loading motor, 40 is a spindle, 4
1 is a cam gear, 41a is a cam groove, 42 is a support shaft, 43 is a link, 43a is a pin, 44.45 is a link, 46 is a support shaft, 47 is a pinch roller arm, 47a is a shaft, 47b is a locking portion, 48 is a torsion spring, and parts corresponding to those in the previous drawings are given the same reference numerals.

First, FIG. 5, which shows the state in stop mode, will be explained.

The cam gear 41 is rotatably attached to a support shaft 40 installed in the chassis (not shown) and the loading motor 3
Rotationally driven by 9. This cam gear 41 is provided with a cam groove 41a having a predetermined trajectory, and a pin 14c provided at one end of the cam arm 14 is loosely fitted into this cam m41a. A pin 14d is provided at the other end of the cam arm 14, and a link 45 is rotatably attached to the pin 14d.

A link 43 is rotatably attached to a support shaft 42 planted in the chassis, and a link 45 and a bent link 44 are rotatably attached to a pin 43a fixed to the tip of the link 43. .

The other end of the link 44 is rotatably attached to a pin 18a fixed to the tip of the pinch roller arm 18. These links 43 to 45 constitute a link mechanism.

The pinch roller arm 18 has an inverted shape and is rotatably attached to a support shaft 46 implanted in the chassis. The cam arm 14 is connected to the reel shafts 2a, 3a (first
(Figure), and a portion of the pinch roller arm 18 is also substantially parallel to this straight line. A protrusion 18b is provided on the side surface of the take-up reel stand 3 at a portion of the pinch roller arm 18 that is substantially parallel to this straight line.

Another pinch roller arm 47 is further rotatably attached to the support shaft 46, and a coil portion of a torsion spring 48 is fitted therein. A shaft 47a is implanted at the end of the pinch roller arm 47, and the pinch roller 19 is rotatably attached to the shaft 47a. Both ends of the torsion spring 48 are arm-shaped, one arm abutting the shaft 47a of the pinch roller arm 47, and the other arm being hung on a spring hook 18c provided on the pinch roller arm 18. The torsion spring 48 is twisted in this state, so that the pinch roller arm 18 is biased clockwise with respect to the support shaft 46, and the pinch roller arm 47 is biased counterclockwise.

Here, since the pinch roller arm 18 is coupled to the cam arm 14 via a link mechanism, the state of the pinch roller arm 18 is determined by the state of the cam arm 14. Therefore, the pinch roller arm 47 is biased counterclockwise with respect to the pinch roller arm 18 by the torsion spring 48. The pinch roller arm 47 is kept in motion.

In the stop mode, as shown in the figure, the pin 14c of the cam arm 14 is connected to the cam? 7/ Cam gear 41 by #41a
It is on the innermost side of the . At this time, the pinch roller 19 is optically separated from the capstan 5a, and the protrusion 18b of the pinch roller arm 18 is on the left side of the load brake applying member 17. Moreover, at this time, in FIG. 3(a), the switching plate 30
is in the state shown by the dashed line.

When an operation button (not shown) for a fast forward mode or a high speed rewind mode is operated from this stop mode, the loading motor 39 is activated and the cam gear 41 is rotated counterclockwise. As a result, the cam arm 14 rotates clockwise about the support shaft 14a and pulls the link 45. For this,
The pinch roller arm 18 rotates counterclockwise with respect to the support shaft 46, and as it rotates, the pinch roller arm 47 also rotates around the support shaft 4G so that the locking portion 47b is always locked to the pinch roller arm 18 by the torsion spring 48. Rotate counterclockwise about. Therefore, the pinch roller 19 approaches the capstan 5a, and the protrusion 18b of the pinch roller arm 18 also approaches the load brake applying member 17. Also,
The protrusion 14b of the cam arm 14 causes the switching plate 30 to rotate clockwise about the support shaft 31 in FIG. 3 ta+.

FIG. 6 shows the states of the cam arm 14 and the pinch roller arm 18, 47 in the fast forward mode and high speed rewind mode.

In these modes, the cam arm 14 is rotated by an angle smaller than the maximum rotation angle possible by the cam gear 41, and the pinch roller 19 does not come into contact with the capstan 5a, but is close to it. The protrusion 18b of the pinch roller arm 18 acts on the load brake application member 17 so that it does not apply any load brake to the take-up reel stand 3. In addition, the protrusion 14 of the cam arm 14
In FIG. 3(a), the switching plate 30 is pushed to become the state shown by the solid line, and the take-up reel stand 3 rotates at high speed without any load brake being applied.

When the two operating ports (not shown) for the recording and playback modes are operated, the cam gear 41 rotates further than in the fast forward and high speed rewind modes shown in FIG. By moving to the side, the cam arm 14 rotates further than in FIG.

Cam arm 14 in these modes. The state of the pinch roller arms 18, 47 is shown in FIG.

In the same figure, regarding the support shaft 46, the pinch roller arm 1
8 rotates counterclockwise, and along with this, the torsion spring 4
8, the pinch roller arm 47 also rotates counterclockwise, and the pinch roller 19 comes into contact with the capstan 5a across the magnetic tape (not shown), but the pinch roller arm 18 rotates further counterclockwise than in this state. rotate in the direction. Since the pinch roller 19 is in contact with the capstan 5a, the engaging portion 47b of the pinch roller arm 47 is disengaged from the pinch roller arm 18, and the pinch roller 19 is pressed against the capstan 5a by the biasing force of the torsion spring 48. Become. The magnetic tape is held between the capstan 5a and the pinch roller 48 by the pressing force of the torsion spring 48.

Further, the protrusion 18b of the pinch roller arm 18 is detached from the load brake applying member 17, and the load brake applying means 1
Reference numeral 7 applies a load brake to the take-up reel stand 3. In FIG. 3(a), the switching plate 30 is released from being pressed by the protrusion 14b of the cam arm 14, and is in the state shown by the dashed line.

Next, the structure and operation of the load brake applying member 17 in FIG. 1 will be explained with reference to FIGS. 8 to 10. In addition, in the same figure, 17a is an arm, 17b is a claw part, 1
7c is a shaft, 17d is a contact member, 17e and 17f are spring hooks, 49 is a support shaft, 50 is a torsion spring, and 51 is a stopper, and parts corresponding to those in the previous drawings are given the same reference numerals.

In FIG. 8, an arm 17a is rotatably attached to a support shaft 49 implanted in the chassis near the take-up reel stand 3, and one tip of this arm 17a is attached to a claw portion 1.
7b, and a shaft 17c is provided at the other end. A contact member 17d is rotatably attached to this shaft 17c, and a coil portion of a torsion spring 50 is fitted therein.

Both ends of the torsion spring 50 are arm-shaped, and the torsion spring 50 is configured so that the arm 17a is biased counterclockwise with respect to the support shaft 49 and the contact member 17d is biased clockwise with respect to the shaft 17C. One arm portion is hung on a spring hook 17e of the arm 17a, and the other arm portion is hooked on a spring hook 17f of the contact member 17d. The arm 17a is a stopper 5 provided on the chassis.
1 sets the rotation limit in the counterclockwise direction, and when the protrusion 18b of the pinch roller arm 18 does not act, the contact member 17d is placed on the take-up reel stand 3 (
(Fig. 4) It is in contact with the outer peripheral surface of 3e, that is, the contact surface 3f. The contact member 17d is a plate-like member with an edge, and an arc-shaped member is provided extending from the edge with respect to the support shaft 49, and this arc-shaped member is brought into contact with the contact surface 3f of the take-up reel stand 3. are in contact. Note that the claw portion 17b at the tip of the arm 17a faces the ratchet 3d of the crimping plate 3b (FIG. 4) on the take-up reel stand 3.

In the stop mode, the arm 17a touches the stopper 51, the contact member 17d touches the contact surface 3f, and the torsion spring 50 is not twisted or expanded. When the take-up reel stand 3 rotates in the direction of the arrow in the normal rotation running mode, the contact surface 3f of the take-up reel stand 3
Due to the frictional force between the contact member 17d and the contact member 17d,
d rotates counterclockwise about the shaft 17C, and the torsion spring 50 is twisted. At this time, the arm 17a is biased counterclockwise with respect to the support shaft 49 by the torsion spring 50, but is fixed by the stopper 51, so that the contact member 17d is biased in the clockwise direction by the torsion spring 52 with respect to the shaft 17C. The biasing force and the counterclockwise biasing force due to the rotation of the contact surface 3f are kept in a balanced state. In this state, the claw portion 17b at the tip of the arm 17a is separated from the ratchet 3d of the take-up reel stand 3, and the contact member 17d is in contact with the abutment surface 3f. The load torque can be made sufficiently small, about 10 g-cm.

As shown in FIG. 9, in the reverse running mode in which the take-up reel stand 3 rotates in the direction of arrow D, the contact member 17d rotates clockwise about the shaft 17c due to the rotation of the contact surface 3f in the direction of arrow D. do. As a result, the torsion spring 50 is twisted so that the arm part expands, but the arm 17a rotates clockwise about the support shaft 49 due to the torsional repulsive force, and the claw part 17b at the tip of the arm 17a is rotated by the ratchet of the take-up reel stand 3. Engage with 3d. For this purpose, in Figure 3 (al.
Braking is applied to the crimping plate 3b, and as a result, the felt 3d
Through gear 3C1, therefore, 30 to m18 unit 3e
A predetermined load torque of 40 g-cm will be applied.

In the fast forward mode and high speed rewind mode, as shown in FIG. 10, the protrusion 18b of the pinch roller arm 18
The contact member 17d is sufficiently rotated counterclockwise about the shaft 17c against the torsional repulsive force of the torsion spring 50. As a result, the contact member 17d is separated from the take-up reel stand 3 (of course, the claw portion 17b of the arm 17a is also removed from the ratchet of the take-up reel stand 3), and the take-up reel stand 3
is in a state in which no load brake is applied by the load brake applying member 17.

In the transition from the forward running mode or the reverse running mode to the temporary stop mode, the capstan motor simply stops and the loading motor 39 does not rotate, and as shown in FIG. and the pinch roller 19. Further, the load brake applying member 17 is maintained in the state shown in FIG.

Therefore, when transitioning from recording mode to pause mode and then setting recording mode, the state shown in Figure 7 is maintained, and the capstan is used to rewind the magnetic tape slightly after the previous recording. The motor rotates in the reverse direction, and at this time, the load brake applying member is in the state shown in FIG. 9, and the load brake is applied to the take-up reel stand 3.
After that, the mode becomes -time stop mode. Then, in order to start the next recording, the capstan motor rotates in the normal rotation direction, and the load brake applying member is in the state shown in FIG. 8. There is no activation of this opening motor and the mechanism for mode switching remains the same. In the case of interval recording, this operation is repeated and the loading motor is not activated.

〔Effect of the invention〕

As explained above, according to the present invention, mode switching between the forward rotation running mode and the reverse rotation running mode does not require switching of the state of the mechanism, thereby eliminating the need for starting and stopping the drive motor, and also ensures that the In the reversal mode, the load brake on the take-up reel stand can be released, and in the reverse run mode, the load brake can be applied to the take-up reel stand, reducing power consumption and improving the durability of the drive motor. Therefore, it is possible to provide a magnetic recording/reproducing device with improved performance, reliability, and economical efficiency.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing the tape unloading state of an embodiment of the magnetic recording/reproducing apparatus according to the present invention, FIG. 2 is a plan view showing the same tape loading state, and FIG. 3(a)
1 is a plan view showing a specific example of the driving force transmission mechanism to the reel stand in FIG.
1 is a partial sectional view showing a specific example of the relay gear and take-up reel stand in FIG. 1; FIG. 5 is a plan view showing a specific example of the mode switching mechanism in FIG. 1 in stop mode; FIG. 6 is a plan view showing the state in fast forwarding and high speed rewinding modes, FIG. 7 is a plan view showing the same in forward running and reverse running modes, and FIG. 8 is a plan view showing the load brake applying member in FIG. 1. FIG. 9 is a plan view showing the state in the forward running mode of one specific example, FIG. 9 is a plan view showing the state in the reverse running mode, and FIG. 10 is a plan view showing the state in the fast forwarding and high speed rewinding modes. It is a diagram. 2--supply reel stand, 3--take-up reel stand, 3d
------Ratchet, 3f・----1・Contact surface,
4---- Capstan motor, 5a--...--
Capstan, 6-1111 - Pulley gear, 7-...
・・Drive gear, 9-1111・-Idler arm, 10
------Idler gear, lla, 11b・-One relay gear, 14-------Cam arm, 15---All change arm, 17---Load brake applying member, 18・-1 pinch roller arm, 18 b--Protrusion, 19--1 pinch roller, 20--1 magnetic tape, 21--Head cylinder, 30--
--All replacement plates, 32-... springs, 39-...
-・Loading motor, 41-・-Cam gear, 41a
・------One cam groove, 47---Pinch roller arm. Figure 3(a). (b) Figure 8 Figure 9 Figure 1O

Claims (1)

[Claims] 1. A magnetic recording and reproducing device that runs a magnetic tape along a predetermined running path between a supply reel and a take-up reel,
The capstan motor can be rotated in both forward and reverse directions, and there is a stop mode, a first mode in which the magnetic tape is held between the capstan and a pinch roller, and a first mode in which the pinch roller is separated from the capstan to rotate the magnetic tape. a mode switching mechanism with a second mode for high-speed feeding; and selectively transmitting the rotation of the capstan motor to a supply reel stand and a take-up reel stand depending on the rotation direction of the capstan motor. a driving force transmission mechanism that operates in the first mode to detect the rotational direction of the take-up reel stand and drive the magnetic tape in the opposite direction with a capstan; 1. A magnetic recording and reproducing device comprising a load brake applying member that applies a load brake. 2. In claim 1, the driving force transmission mechanism includes a driving gear that is rotatably driven by the capstan, and is rotatably and slidably attached to a support shaft of the driving gear and meshes with the driving gear. an idler arm having an idler gear, and the supply reel stand and take-up reel stand include
a first gear meshing with the gear of each reel stand;
A relay gear consisting of the first gear and a second gear coupled via a coupling mechanism is provided, and the idler arm is moved along the spindle of the drive gear by the operation of the mode switching mechanism. By sliding, the idler gear
meshing with a second gear of the relay gear in the first mode;
A magnetic recording/reproducing device characterized in that it is configured to mesh with the first gear of the relay gear in the second mode. 3. In claim 2, the take-up reel stand has a mounting table that rotates together with the gear and on which the take-up reel is placed, and a ratchet on the outer periphery, and is connected to the gear by a coupling mechanism. The load brake applying member includes a rotatable arm having a claw portion facing the ratchet, a contact member rotatable with respect to the arm, and a crimping plate coupled to the load brake applying member. The contact member includes a spring member that applies an urging force between the contact member and a stopper that defines a rotation limit of the arm, and the contact member contacts the rotating part of the take-up reel stand in the first mode. In the second mode, the contact member is moved away from the reel stand, and in the first mode of the reverse running mode, the claw of the arm is rotated as the contact member rotates as the take-up reel stand rotates. A magnetic recording/reproducing device characterized in that a portion engages with the ratchet to brake the pressure bonding plate. 4. In claim 1, 2 or 3, the mode switching mechanism is configured to separate the contact member of the load brake applying member from the take-up reel stand during the second mode. Features of magnetic recording and reproducing device.