JPS59132446A - Reel high speed feeder for magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To eliminate the need for an exclusively used motor for high speed feeding and to prevent having an adverse effect on reproduction by the constitution that an eccentric turning wheel is brought into press contact with a flywheel only at rapid traverse and rewinding and both reels and driven at a fast speed by utilizing the power of capstan. CONSTITUTION:Applying power to an exciting coil 15a, the magnetic flux of it cancels the magnetic flux of a magnet 20a, the interlocking is released and the eccentric turnint wheel 10a is brought into press contact with a flywheel 2a by the operation of a spring 19a; a reel 5a is turned counter clockwise via the turnig wheel 10a and a gear 9a to traverse rapidly the magnetic tape. When the power supply to the exciting coil 15a is interrupted, a reciprocating lever 3a is interlocked by a magnet 20 adsorbed to a yoke 15 when the position of the maximum bias point of the turning wheel 10a opposes to the flywheel 2a. Further, the turning wheel 10a is detached automatically from the flywheel 2a by the turning of the turning wheel 10a for a slight angle. The effect of operation is the same as that at the rapid traverse since the turning wheel 18 is given between the flywheel 2a and the eccentric turning wheel 17 at the rewinding.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a new and effective means for eliminating high-speed adverse effects during fast-forwarding, cueing, reviewing, and rewinding of a winding reel.

In intermediate recording and playback machines or video equipment that use cassettes, a special electric motor is used to drive the platform that feeds both the take-up and finish reels at high speed. However, such means are expensive, increase the occupied volume, and have the disadvantage of increasing the number of motors that have the highest failure rate by one.Due to the inertia of the motor,
There is an inconvenience that unnecessary movement of the magnetic tape occurs. The drawback is that the control circuit that rotates the electric motor forward and backward is complicated and must vibrate. A means of high-speed feeding of both reels is also commonly used, but this method uses capstan power to constantly drive a rotary pulley with a rubber belt, which requires only 8 hours of regeneration. This has the disadvantage that it sometimes causes uneven rotation, which increases wah and deteriorates sound quality.

Furthermore, since it is necessary to reverse the rotation of the nucapstan motor, there is a drawback that the control circuit becomes complicated.

Since the capstan is rotating in the nouveauze mode, there is a drawback that the mechanism for stopping and holding both reels is complicated.

The device of the present invention has succeeded in eliminating the above-mentioned drawbacks, and is further characterized by a small control input, no generation of mechanical noise, stable operation, and a simplified configuration.

Next, the features, functions, and effects of the configuration of the present invention will be explained with reference to FIG. 1.2.

FIG. 1 shows only the parts of a magnetic recording/reproducing machine using a cassette that are related to the present invention, and other well-known means are omitted and not shown.

Symbol 1a is a capstan, which is rotatably supported by a shaft bearing (not shown) provided in the main body.

The flywheel 2a is fixed to the lower end of the capstan 1a and is driven in the direction of arrow A, that is, counterclockwise, and the capstan 1a cooperates with a pinch roller (not shown) to send the magnetic tape to the left. It has become. When the capstan 1a is belt driven by an electric motor, the rotating shaft of the electric motor is directly connected to the capstan.

It may become a stun.

The reel 5a is integrally formed with a reel stand 6a, and is rotatably supported by a support shaft 4a mounted on the main body, thereby forming a take-up reel. The reel stand 6a and the gear 7a are made into one piece by plastic molding.

The lever 3a is rotatably supported by a support shaft 4a, and a gear 9. a and an eccentric rotary ring 10a (the peripheral edge of which is a comb ring) formed integrally therewith are rotatably supported. Gears 7-a and 9a are in mesh with each other.

An excitation coil 15 is attached to the U-shaped yoke 15 fixed to the main body.
a is attached, lever 3aK is set to 20
a is fixed by NX SK@magnetic as shown. In the illustrated position, the yoke 15 allows the magnetic
Since the magnetic path of the lever 20a is closed, it is strongly attracted, and therefore the lever 3a is locked against the repulsive force of the spring 19a.

When the excitation coil 15a is energized, the magnetic flux generated by the excitation coil 15a is in the opposite direction to the magnetic flux of the magnet 20a, so the lock is released, and therefore, due to the action of the spring 19a,
The rotating wheel 10a is pressed against the flywheel 2a.

The rotary wheel 10a and the gear 9a are driven clockwise by the flywheel 2a, and this driving force causes the reel 5a to
is rotated counterclockwise. Due to the reaction of the loads on the gear 7a and the reel 5a at this time, the lever 3a receives clockwise torque and increases the pressing force between the rotary wheel 10a and the flywheel 2a, thereby ensuring reliable power transmission. Therefore, the spring 19a only needs to be weak, and the excitation coil 1
5a has the characteristic that only a small amount of current is required.

The reel 5a rotates at high speed, drives the huff of the cassette fitted thereto, and feeds the tape at high speed, so it can be set to fast forward or cue mode. At this time, the capstan 2a and the pinch roller are separated by known means.

Instead of using the flywheel 2a as the drive source, it is also possible to provide a separate rotary wheel that rotates synchronously in the same direction as the capsta xla and use this as the drive source for the rotary wheel 10a. Encouragement 1+B
: When the power to the lever 15a is cut off, when the lever 3a, which is moving back and forth, comes to the position shown in the figure, it will turn off.
(Ja is attracted to the yoke 15 and locked again.

The yaw 15 locks the lever 3a when the maximum deflection point of the rotary wheel 10a faces the flywheel 2a. Furthermore, as the rotary wheel 10a rotates by a slight angle, the rotary wheel 10a automatically separates from the flywheel 2a, cutting off power transmission and stopping. Therefore, high-speed feeding of the magnetic tape is also stopped.

Due to the above-described operation, the power transmission is cut off at the same time as the power supply is stopped, and the running of the magnetic tape is rapidly stopped. It has the effect of reducing the influence of the inertia thread of the electric motor and flywheel.゛Next, reel 5b when rewinding
Explain the drive. The support shaft 18d installed in the main body has
The lever 18c is supported, and the lever 18c and the lever 18
b is bendably supported by a connecting bottle, and lever 1
A rotary ring 18 made of rubber is rotatably supported on the shaft 8b by a support shaft 18a.

The reel 5b, the reel stand 6b, and the gear 7b are molded into one piece by a push rod, and are rotatably supported by a support shaft 4b built into the main body. The lever 16 is the support shaft 4b
A support shaft 17 is rotatably supported by
In aK, a gear 17b and an eccentric rotary wheel 17 made in one body are rotatably supported, and the gears 17b and 7b are in mesh with each other.

The magnetft 20 is magnetized to N and S as shown in the figure, and is fixed to the lever 16. The electromagnetic locking device shown by symbol 21 has exactly the same configuration as the one including the yoke 15 and excitation coil 15a described above, and when the excitation coil is energized, the lock of the lever 16 is released, and due to the elastic force of the spring 19, It is pressed against the rotating ring 18, and due to this pressing force, the rotating ring 18
is pressed against the flywheel 2a and receives power transmission therefrom.

The rotating wheel 17 is driven in the counterclockwise cutting direction, and the reel 5b is driven in the clockwise cutting direction. In this case as well, due to the reaction of the gear 17id rotating in the counterclockwise direction and the gear 7b rotating in the counterclockwise direction,
When the lever 16 is rotated counterclockwise, the greater the negative force, the more the pressing force between the rotary wheels 17 and 18 is increased, thereby ensuring power transmission. Other effects are similar to those of the fast forwarding described above.

The wheel 5b, which rotates in one direction at the time, becomes a moat for the fitting shaft.

The rotary wheel 18 is effective because it contacts the flywheel 2a with a force or a biting angle that is a certain distance above (on the plane of the paper).

When the electric fl. 6 locking device 21 is de-energized, the rotary wheels 17, 18 automatically move away from the flywheel 2a, as in the case described above, so rewinding is stopped and the lever 1
6 is locked by an electromagnetic locking device 21. The operation and effect are also the same as those described above, so the explanation will be omitted.

The %&B locking device may be of any other type as long as it is unlocked by energization and locked by stopping energization.

In the Bose motor, even if the capstan 1a rotates, both reels can be stopped and held by the locking command of the lever 3a, 16. Even during regeneration, the rotating wheels 10a, 17. Since it is separated from the capstan power, there is no possibility of deterioration of sound quality.

The reproduction mode means may be of any known type, but
Next, an example of the playback mode will be explained.

A pulley 2b is provided on the capstan 1a via a well-known slip mechanism using a felt plate. A pulley 23 is integrally formed on the back side of the gear 7a, and is connected to the gear 7a via a pawl clutch. A comb belt 22 is placed between the pulleys 2b and 723. During fast forwarding, the gear 7a rotates at high speed, so no torque is transmitted to the pulley 23 by the aforementioned pole clutch.

In the reproduction mode, the reel 5a is driven by the belt 22 via the pole clutch, so that the required winding and winding of the solid tape can be performed.

Torque ripple through the belt 22 is absorbed by the felt sling mechanism between the pulley 2b and the capstan 1a, thereby preventing deterioration of sound quality.

What is shown in FIG. 2 is an embodiment in which the present invention is applied to an auto-reverse type magnetic recording machine.

In this case, the capstan 1a is rotating in the direction of arrow A, and the capstan lb is rotating in the direction of arrow B.

The flywheels 2a and 2b are also fixed to the capstan 1a11b and rotate in the same direction.

This is a well-known mechanism in which when a corresponding pinch roller is pressed against each of the capstans 1a and 1b, the S air tag also moves to the left or right to perform regeneration.

Components with the same symbols as those in FIG. 1 are the same members, so their explanation will be omitted.

Gears 7a and 9a in Fig. 2, eccentric rotating wheel 10a, reel 5a, reel stand 5a, lever 3a, Magnen) 2
The 0 a % spring 19a is the same as the member with the same symbol in FIG. 1, and its operation and effect are also the same.

Further, the electromagnetic locking device including the yoke 15 and the excitation coil 15a in FIG. 1 is omitted and shown by the dotted line 14.

With the above configuration, when the electromagnetic locking device 14 is energized, the magnetic tape is fast-forwarded or cued at high speed via the reel 5a.

Reel 5b, reel stand 6b, gears 7b, 17 in Fig. 2
(b) The lever 16, rotating ring 17, magnet 20, and spring 19 have exactly the same functions and effects as the members with the same symbols in FIG. Th6B locking device 2 in Figure 1
1 is shown in detail. That is, the excitation coil 13a is attached to the yoke 13 fixed to the main body, and the magnetic flux generated by this energization is in the opposite direction to the magnetic flux of the magnet 20, so that the lock is released. When the excitation coil 13a is de-energized, the lever 16 is locked in the illustrated position.

In the case of FIG. 1, the rotating ring 17 is in pressure contact with the rotating ring 18, but in FIG. 2, the rotating ring 17 is in pressure contact with the flywheel 1b. Therefore, the operation and effect are exactly the same, and the reel 5b is driven clockwise and the magnetic tape is wound clockwise at high speed, which can be used as a rewind or review mode, and it can also be stopped. can.

In the reproduction mode, it is convenient in use to reverse the running direction of the above-mentioned fast forward, cue, rewind, and review depending on whether the magnetic tape is running in the left or right direction.

Next, each stage will be explained with reference to FIG.

In Figure 83, symbols 3i and 32f are R8 type 797
This is a 17077 circuit. When there is an input from the IN5 children 31a and 32a, the power supply to both the video coils 13a and 15a is stopped. The animation lock 13a has the same symbol as the electromagnetic locking device shown in FIG. Also, the video coil 15a is
When electricity is traced to the excitation coil included in the electromagnetic locking device 14 of FIG. 2, the lever 3a is unlocked and the reel 5a is driven. The terminal 270 input value is a signal when the magnetic tape is running to the left in Fig. 2, and for example, it is sent via the 11 switch which is interlocked with the arm of the pinch roller that is in pressure contact with the capstan 1a. It has been entered.

The input signal to the terminal 28 is either a magnetic tape or a signal when the vehicle is traveling to the right in FIG. ing.

The electrical signal obtained when the fast forward command button is pressed,
Or the electrical signal of cue mode command for music selection is sent to terminal 2.
It is input from 9. Further, an electric signal for a review mode command for rewinding or selecting music is inputted from the terminal 30.

When the magnetic tape travels to the left and is in playback mode,
When a fast forward or cue mode command is given, terminal 29
Since there is an input signal, and there is already an input signal from the terminal 27, an output is obtained from the AND circuit 26, energizing the flip-flop circuit 3, and energizing the excitation coil 15a. Accordingly, the reel 5a is driven, resulting in a fast forward or cue mode. When an electric signal for a return command is input to the terminal 31a, the flip-flop circuit 31 is reversed, the current supply to the shift coil 15a is stopped, the reel 5a is also stopped, and fast forwarding or cue mode is interrupted.

When a rewind or review mode is commanded when the magnetic tape is in the playback mode moving to the left, the terminal 30
Since an electric signal is input, the output via the ant circuit 27 energizes the flip-flop circuit 32 and energizes the excitation coil 13a, so the reel 5b is driven and the tape 6b is moved to the right. High-speed forwarding 9 is used to rewind or review mode.

When terminal Ω≦input No. 110 is present, the flip-flop circuit 32 is restored, and the S current of the excitation coil 13a is stopped, and the mote of the review is interrupted.

The flip-flop circuit 32 is energized and the excitation coil 13a is energized by the output, so that the tape at the fixed end is fed at a high speed one step at a time, and reaches the fast forward υ or the key 3 mote. Terminal 32 a j: This mode is interrupted when there is 9 human power.

In the reproduction mode where the magnetic tape runs to the right, when there is a human input signal from terminal 30, AND times II! The output via terminal 428 energizes the flimp circuit 31 and energizes the excitation coil 15a, so that the magnetic tape is fed leftward at high speed to enter rewind or review mode. This mode is interrupted when there is an input from the terminal 31a.

As explained above, effective means can be provided.

As explained in the embodiment of FIG. 1.2.3, the object of the present invention stated at the beginning has been achieved and the effects are significant.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of the apparatus according to the present invention, and FIG. 2 is a control circuit diagram of the OK, rewind, and review modes, respectively. la, 1b - Capstan, 2a, 2b Flutter wheel, 3a, 16・Lever, 5a, 5
b-reel, 6a, 6b --- reel stand,
7a, 7b・-gear, 17a, 9a gear, 17, l
Oa eccentric rotating wheel, 19.19a spring,
20.20 a - Magnet, 14.21 - Electromagnetic locking device, 13.15 Yoke, 13a, 15a - Excitation coil, 22 - Belt, 2b, 23 Guri,
4a, 4b Support shafts, input terminals for rewind review commands, 27.28... Input terminals for "No. 15" corresponding to the fact that the magnetic tape runs left and right in the playback mode.

Claims (2)

[Claims] (1) When a magnetic recording/reproducing machine using a cassette is placed in a position, if the take-up reel is rotatably supported via a spindle provided on the main body, the first gear rotates coaxially and synchronously with the take-up reel. , the above-mentioned support Il! A first lever rotatably supported via the lever, and a second gear rotatably supported by a support shaft provided at the free end of the lever and meshing with the first gear. a first rotary wheel of an eccentric lever that rotates coaxially and synchronously with the gear; and a spring that biases the first lever so that the rotary wheel is pressed against the rotary wheel that rotates synchronously with the capstan. Then, at a position near where the first rotating ring is most deflected, the free end of the first lever is slightly separated from the rotating ring that rotates synchronously with the capstan, and the free end of the first lever is moved against the elastic force of the spring. By energizing the first electromagnetic locking device that locks and holds the bar, and the excitation coil included in the magnetic locking device, the first 17 bars are unlocked. Due to the reaction of the load on the first gear driven by the rotation of the second gear on the first rotating wheel, the first collar receives rotational torque, and the rotational torque is applied to the first rotating wheel. The contact slide increases the pressure contact force of the rotary wheel that rotates synchronously with the capstan, and the reel that is rotatably supported via the support shaft provided on the main body rotates once on the same axis. a third gear, a second 17 bar rotatably supported via the support shaft marked @, and a second 17 bar rotatably supported by the support shaft provided at the free end of -. At the same time, a fourth gear meshes with the third gear, an eccentric second rotating wheel coaxially rotates synchronously with the third gear, and the second rotating wheel is driven by the capstan power. At a position near the most biased position, it is driven by the capstan power and is slightly separated from the rotating wheel marked ^IJ, which rotates in the opposite force direction, and is connected to the locking device and the excitation coil included in the electromagnetic locking device. By energizing, the lock of the second lever is released and the second lever is turned on.
The second lever receives a rotational torque due to the reaction of the load on the third gear driven by the rotation of the rotating wheel and the fourth gear, and the second lever is driven by the capstan power to the second rotating wheel. A mechanism for increasing the pressure contact force of the rotating wheel rotating in the counterclockwise direction and energization of the first or second electromagnetic locking device are controlled to release the lock of the first or second lever. A reel expressway 9 device of a magnetic recording/reproducing machine, characterized by comprising a control circuit that selectively performs selection. (2) In an auto-reverse magnetic recording/playback device using a cassette, the first capstan rotates in the forward direction to feed the magnetic tape in the forward direction, and the second capstan rotates in the opposite direction to feed the magnetic tape in the reverse direction. If the take-up reel is rotatably supported via a capstan and a spindle provided on the main body, a first gear that rotates synchronously on the same axis as the take-up reel and a first gear that rotates in synchronization with the capstan, and a spindle that rotates via the spindle. A first lever is freely supported, and a second lever is rotatably supported by a support shaft provided at the free end of the lever □ and meshes with the first gear.
a gear, an eccentric first rotating ring that is coaxial and rotates synchronously with the gear, and a first lever so that the rotating ring is pressed into contact with the rotating ring that rotates synchronously with the first capstan. At a position near where the first rotating ring is most deflected, the spring that rotates is slightly separated from the rotating ring that rotates in synchronization with the first capstan, and the first rotating ring is moved against the elastic force of the spring. The first lever is unlocked by energizing a first electromagnetic locking device that locks and holds the free end of the lever, and an excitation coil included in the electromagnetic locking device.
The first rotating wheel is driven by the rotation of the first rotating wheel and the second gear. The mechanism includes a mechanism in which the first lever receives rotational torque due to a reaction of the load on the gear, thereby increasing the pressure contact force of the rotating ring that rotates in synchronization with the first capstan against the first rotating ring, and a support provided on the main body. If the feed reel is rotatably supported via a shaft, a third gear coaxially rotates synchronously with the feed reel, and a second lever rotatably supported via the aforementioned support shaft. , by the support shaft provided at the free end of the lever,
a fourth gear that is rotatably supported and meshes with the third gear; an eccentric second rotating wheel that rotates coaxially and synchronously with the fourth gear; and the rotating wheel is connected to a second capstan. a suffling that resiliently repels the second lever so as to be in pressure contact with the synchronously rotating rotating wheel; and the aforementioned rotating wheel that rotates synchronously with the second capstan in the vicinity of the position where the second rotating wheel is most deflected. a second electromagnetic locking device that locks and holds the free end of the second lever against the elastic force of the spring that is slightly spaced apart from the spring; By energizing the excitation coil, the lock of the second lever is released, and the second rotating wheel is driven by the reaction of the load on the third gear driven by the rotation of the fourth gear.
A mechanism for increasing the pressing force of the rotary wheel, which rotates synchronously with the second capstan against the second rotary wheel when the lever receives rotational torque, and energizing the first or second magnetic locking device. 1. A high-speed reel feeding device for a magnetic recording/reproducing machine, comprising a control circuit that selectively releases the lock of the first or second lever by controlling the locking of the first lever or the second lever.