JPS5920181B2 - magnetic recording and reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic recording/reproducing device, and in particular to a reel stand drive device thereof, and an object thereof is to provide an efficient reel drive device that is relatively easy to assemble and requires less space. The purpose is to make it possible to drive the stand.

In conventional magnetic recording and reproducing devices, the rotational driving force for the reel stand is obtained from a capstan wheel, but in this type of configuration, one motor must drive both the capstan and the reel stand. Since a large torque is required and the configuration is relatively complicated, it has become common practice to provide the reel stand driving motor separately from the capstan driving motor. When a dedicated motor is used to drive the reel stand, the configuration is generally relatively simpler than when a dedicated motor is not used, but the present invention further pursues this and advances the simplification of the configuration. This allows the reel stand to be driven efficiently in space. An embodiment of the present invention will be described below with reference to the drawings.

In the figure, a supply reel stand 4 and a take-up reel stand 5 are rotatably provided on shafts 2 and 3 set up on a mechanical chassis 1. 4a and 5a are reel shafts that are engaged with the reel hub of the tape cassette.

The reel motor 6 is located on the substantially perpendicular bisector L2 of the line Li connecting the support shafts 2 and 3 of the supply reel stand 4 and take-up reel stand 5.
is provided. A cylindrical first pulley 8 and a second pulley 9 having a V-shaped groove for hanging a belt on the outer periphery are fixed to the rotation axis T of the reel motor 6. A shaft 10 mounted on the mechanical chassis 1 has a rotatable lever 11 supported almost at its center, and a shaft 12 mounted on one end of the lever 11 is rotatably mounted on the other end. Idler shaft 1
3 is connected to the idler lever 14, and the idler shaft 13 is provided with a rotatable first idler 15. This first idler 15 is disposed so as to be able to come into contact with the supply reel stand 4 or the take-up reel stand 5 and the first pulley 8 at the same time, and normally the idler 15 is connected to the first pulley 8 as shown in FIG. 8. A bow tension spring 16 is stretched between the lever 11 and the mechanical chassis 1 for rotating and biasing the lever 11 in a counterclockwise direction to hold it in a position away from the reel stands 4 and 5. The other end of this lever 11 is connected to a movable iron core 19 of a plunger 18 via a spring 17. On the other hand, a shaft 20 mounted on the mechanical chassis 1 is rotatably supported at one end of a F-shaped idler lever 21, and a shaft 22 mounted approximately in the center of this lever 21 has an outer circumference. A second pulley 23 having a groove for hanging a belt and a second idler 24 integrally provided with the pulley 23 are rotatably provided.

A rubber belt 25 is stretched between the first pulley 9 and the second pulley 23, and the rotational driving force of the motor 6 is applied to the second pulley 23 and the second idler 24 via the first pulley 9. It is configured to communicate. The pin 26 provided at the other end of the idler lever 21 normally contacts the head chassis 27 and holds the idler lever 21 in position against the tension of the belt 25, causing the second idler 24 to contact the take-up reel stand 5. preventing contact. erasing head 28;
The head chassis 27 to which the recording/playback head 29 is attached is placed on the mechanical chassis 1 via rolling elements such as steel balls, and is capable of moving forward and backward using shafts 30 and 31 upright on the mechanical chassis 1 as guides. It is provided. Note that the forward direction is indicated by arrow A, and the backward direction is indicated by arrow B.
Further, a lever 33 is rotatably supported on a shaft 32 mounted on the mechanical chassis 1, and a pin 34 provided at one end of this lever 33 engages with a through hole 35 provided on the head chassis 27. Normally, the lever 33 is rotationally biased clockwise by a spring 34 provided on the lever 33, and the head chassis 25 is normally moved backward. The other end of the lever 33 is rotatably connected to a movable iron core 38 of a plunger 37. Further, a pinch roller lever 40 is rotatably provided on a shaft 39 installed on the mechanical chassis 1, and a pinch roller 41 is rotatably provided on the pinch roller lever 40 with a shaft 42. 2
A pin 43 provided at the head 7 releases contact with the capstan 44, which rotates at a constant speed under the rotational force of a motor (not shown). The erasing head 28 and the recording/reproducing head 29 are brought into contact with a tape (not shown), and the pinch roller 41 receives the biasing force of the spring 45 via the pinch roller lever 40, so that the capstan 4
4 is configured to send out the magnetic tape at a constant speed. In the embodiment described above, when a constant speed tape running operation such as recording or playback is performed, the plunger 37 is energized and its movable iron core 38 performs a suction operation, thereby causing the head chassis 27 to move at a constant speed.
moves forward, and the magnetic tape is run at a constant speed by a capstan 44 and a pinch roller 41.

At the same time, the pin 26 at the other end of the lever 21 fits into the recess 46 provided in the head chassis 27 due to the advancement of the head chassis 27, and the lever 21 rotates clockwise around the shaft 20 due to the tension of the belt 25. 2 idler 2
4 is pressed against the take-up reel stand 5. At this time, the reel motor 6 is rotating counterclockwise, and the driving force is transmitted to the take-up reel stand 5 via the first pulley 9, belt 25, second pulley 23, and second idler 24. , a capstan 44, and a pinch roller 41 to wind up the magnetic tape sent out to the take-up reel stand 5 side. At this time, the angle formed by the shaft 20 and the take-up reel stand 5 around the support shaft 22 of the second idler 24 is the so-called idler self-biting angle (usually used between a rubber idler and a metal or resin pulley). 112
(approximately 180 parts) or above, the tension of the belt 25 simply presses the second idler 24 against the take-up reel stand 5, and the idler 24 itself presses against the reel stand 5, thereby ensuring sufficient transmission. Torque can be secured. Also, at this time, since the plunger 18 is not energized, the lever 11 is not energized by the spring 16.
The first idler 15 does not come into contact with any of the first pulley 8, the supply reel stand 4, and the take-up reel stand 5 because it is urged to rotate counterclockwise by the biasing force of. on the other hand,
During the fast forward operation, the plunger 37 is not energized, the head chassis 27 remains retracted, and the other end pin 26 of the lever 21 is pressed against the side wall of the head chassis 27 by the tension (elastic return force) of the rubber belt 25 and held in position. The idler 24 of No. 2 is held at a position apart from the take-up reel stand 5, but since the plunger 18 is energized, its movable iron core 18 is attracted, and the lever 11 is moved via the spring 17 and the spring 16. The first idler 14 is rotated clockwise about the shaft 10 against the force, and the first idler 14 is brought into contact with the first pulley 8 .

The contact force at this time is the magnitude obtained by subtracting the counterclockwise rotation urging force of the spring 16 against the lever 11 from the clockwise rotation urging force of the spring 17 against the lever 11 . At this time, the reel motor 5 is rotating counterclockwise, and since a friction member (not shown) is inserted between the first idler 15 and the shaft 13, the first idler 15 rotates by itself. A counterclockwise rotational force is applied around the shaft 21 to the idler lever 14 before the idler lever 14 rotates, and when the idler lever 14 rotates and the first idler 15 comes into contact with the take-up reel stand 5. For the first time, the first idler 15 rotates against the frictional force between the idler 15 and its support shaft 13, and the driving force of the reel motor 6 is transmitted to the take-up reel stand 5. During rewind operation, all operations are the same as during fast forward, but only the motor 6 is energized so that it rotates clockwise, in the opposite direction to that during fast forward.
The idler 15 rotates the lever 14 clockwise, and after contacting the supply reel stand 4, the idler 15 transmits the driving force of the motor 5 to the supply reel stand 4 and winds the tape on the reel stand 4 side. .

By the way, in general, when fast forwarding or rewinding, a higher voltage is applied to the motor than during normal recording or playback, but when using a DC motor, if a high voltage is applied and the motor is rotated with no load, the motor will rotate at high speed, causing extraneous vibrations. This is not desirable.

In this embodiment, since there is always an axis loss due to the tension of the belt, it is possible to prevent vibrations from occurring due to abnormally high speed rotation. Also, when fast forwarding or rewinding, high torque is usually required, so if the first pulley is rotated via a belt, etc., slippage between the belt and pulley may occur due to aging, dirt, or oil, and the torque is reduced to the reel. However, in this embodiment, since the first pulley is directly connected to the motor and rotates, no slip occurs between the two, and the reel stand is reliably driven.

During regeneration, a weak torque is sufficient, so even if the second pulley is rotated via the belt, there is little chance of slippage, and since the belt can absorb the vibrations of the motor, unnecessary vibrations are not transmitted to the take-up reel stand. This will improve the wow and flutter. In the embodiment, the second pulley 23 and the second idler 24 are formed integrally, but the same effect can be achieved even if they are separated and a friction material such as felt is inserted between them to create a frictional connection. .

The same applies to a case where the take-up reel stand is frictionally connected instead. Furthermore, the plungers 18 and 37 may be omitted and manually operated.

As explained above, in the magnetic recording and reproducing apparatus of the present invention, the reel motor is arranged on the perpendicular bisector of the line connecting the axes of the supply reel stand and the take-up reel stand, and during fast forwarding and rewinding, the reel motor is The rotational force is directly transmitted to the reel stand through the first idler to ensure reliable driving, and during operation and playback, the rotational force of the motor is transmitted through the belt to the second idler, and then to the take-up reel stand. This system is designed to transmit the information to drive the take-up reel stand while suppressing unnecessary vibrations of the motor.
By employing the arrangement position of the motor and the control form of the first idler and second idler, it can be installed relatively easily and in a small space, and moreover, the reel stand can be driven reliably. .

[Brief explanation of the drawing]

FIG. 1 is a plan view showing a magnetic recording and reproducing device according to an embodiment of the present invention, and FIG. 2 is a plan view showing the recording and reproducing states of the device. FIG. 3 is a plan view showing the device in a fast forward state. 4... Supply reel stand, 5... Take-up reel stand, 6... Reel motor, 8... First idler, 9... ...1st bottle 1 liter 23.
...Second pulley, 24...Second idler, 25...Rubber belt, 27...
Hetsiyaan.

Claims (1)

[Claims] 1. A supply reel stand, a take-up reel stand, a motor disposed approximately on a perpendicular bisector of a line connecting the supply, take-up, and reel axes of both reel stands; a pulley fixed to the rotating shaft; a first idler that is movable toward and away from the pulley and selectively contacts the supply reel stand and the take-up reel stand to transmit the driving force of the motor to each reel stand; A second idler is provided that can come into contact with and separate from the take-up reel stand and to which driving force is transmitted from the motor via a belt, and during recording or reproduction, the first idler is connected to a pulley, a supply reel stand, and a take-up reel stand. The second idler is placed in contact with the take-up reel stand, even though it is located away from either of the first pulley, the supply reel stand, or the take-up reel stand during fast forwarding or rewinding. 1. A magnetic recording/reproducing device characterized in that the second idler is placed in a position apart from the take-up reel stand, although the second idler is brought into contact with the first idler at the same time. 2. The second idler is rotatably supported at one end by an idler lever that is rotatably supported at the other end and is locked to the head board, and when the head board is in the retracted position, the second idler is held at a position away from the take-up reel stand, but when the head board is moved forward, the other end of the idler lever separates from the head board, and the elastic restoring force of the belt connecting the second idler and the motor 2. The magnetic recording and reproducing apparatus according to claim 1, wherein the second idler is configured to abut against the take-up reel stand.