JPH02276054A - Rotary head type magnetic recording/reproducing device - Google Patents

Abstract

PURPOSE:To decrease the activating torque of a rotary drum driving motor, to miniaturize the external size of the rotary drum driving motor, and to reduce energy consumption by temporarily releasing magnetic tape tension. CONSTITUTION:A device is composed so that the frictional resistance between the outer periphery of a rotary 4 and a magnetic tape 13 may be reduced by temporarily reducing the tape tension of the magnetic tape 13 before the rotary dum 4 is rotationally driven again. Consequently the frictional resistance between the rotary drum 4 and the magnetic tape 13 is reduced. Thus when the rotary drum 4 is driven again, even when the activating torque of a rotary drum driving motor 17 is small, the rotation is started, the external size of the driving motor 17 is reduced according to the small torque, and since the load of the driving motor 17 is decreased, the energy consumption of the driving motor 17 is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a rotating head type magnetic recording/reproducing device such as a video tape recorder or an audio tape recorder, and particularly relates to a rotating head type magnetic recording/reproducing device such as a video tape recorder or an audio tape recorder. A motor that drives the rotating drum by temporarily stopping the rotation of the rotating drum and reducing resistance between the magnetic tape wound around the rotating drum and the rotating drum when driving the rotating drum again. The structure is such that it can be started even if the starting torque is small.

2. Description of the Related Art An example of a conventional rotary head type magnetic recording/reproducing device will be explained with reference to FIG.

In the figure, reference numeral 13 is a magnetic tape, a fixed post 2 disposed on a base (not shown), a rotary ram 4 with a built-in rotary head, and a predetermined winding of the magnetic tape 13 on the rotary drum 4. It advances while being regulated by the moving post 3 etc. for wrapping only the corner.

The magnetic tape 13 is connected to the fixed post 2 and the movable post 3.
In order to run stably while contacting the rotating drum 4, tension is required, and in order to apply that tension to the magnetic tape 13, the magnetic tape 13 is rotatably held on the base by a pin 6, and one end is is provided with a tension arm 8 which has a rotational force in the direction of the arrow when engaged with a spring 9, and a tension post 1 provided at the other end of the tension arm 8.
The rotary drum 4 is configured to be in elastic contact with the magnetic tape 13 at all times.
7 and a control box 11 for controlling the rotation of the motor 1.
and a power switch 12 for closing the circuit,
The rotation is controlled. In the case of recording standby or playback pause, as shown in FIG. 2, the magnetic tape 13 stops advancing while tension is applied to the magnetic tape 13 by the tension post 1, and the rotating drum 4 Although the rotating drum 4 is kept in a rotating state, the magnetic head (not shown) built in the rotary drum 4 repeatedly contacts the magnetic tape 13 at the same position, so that the coating is applied onto the magnetic tape 13. The resulting magnetic powder peels off and adheres to the magnetic head, degrading the performance of the magnetic head. In order to prevent this, when the above state continues for a certain period of time, the power switch 12 is opened in response to a command from the control box 11, and the rotation of the rotary drum 4 is stopped.

On the other hand, in order to reduce power consumption, the power switch 12 may be intentionally opened in the state shown in FIG. 2 to stop the rotation of the rotary drum 4 even before the predetermined time has elapsed.

The rotary drum 4 that has been stopped by each of the above methods is configured to start rotating with the magnetic tape 13 still wound thereon by closing the power switch 12 again.

Problems to be Solved by the Invention However, in the above-described configuration, since the tensioned magnetic tapes 13 are wound around the stopped rotating drum 4, the outer periphery of the magnetic tape 13 and the rotating drum 4 is Since the rotary drum drive motor 17 is in close contact with the rotary drum 4, the rotary drum drive motor 17 is large. There was a problem that the power consumption increased.

Means for Solving the Problems The rotary head type magnetic recording device of the present invention stops the rotation of the rotary drum after the magnetic tape is wound around the rotary drum at a predetermined angle, and then drives the rotary drum to rotate again. By temporarily reducing the tape tension of the magnetic tape prior to this, the frictional resistance between the outer periphery of the rotating drum and the magnetic tape can be reduced.

Effect According to the above structure, the frictional resistance between the rotating drum and the magnetic tape is reduced by separating the outer periphery of the rotating drum from the magnetic tape, so that when the rotating drum is driven again, the rotating drum driving motor is activated. Rotation can be started even when the torque is small, and the external size of the drive motor can be reduced accordingly.Furthermore, by reducing the load on the drive motor, the power consumption of the drive motor can be reduced. Embodiment FIG. 1 shows an embodiment of the rotary head type magnetic recording/reproducing apparatus of the present invention.The difference from the conventional configuration shown in FIG. By opening the power switch 12, the rotary drum 4 is stopped, and when the rotary drum 4 is driven to rotate again, the tension post 1 is rotated in the direction of arrow a away from the magnetic tape 13 before the rotary drum 4 rotates. The tension on the tape 13 is released and the magnetic tape is in the state shown by the dashed line 16, at which point the rotating drum 4 and the magnetic tape 16 are separated.

As a mechanism for rotating the tension post 1 in the direction of arrow a, a cam rotation motor 1o controlled by a control box 11 is connected to a cam gear 5 having a cam groove 5a by a known connection method, and the rotation Before the control box 11 sends out a signal to rotate the drum drive motor 17 again, a signal to rotate the cam rotation motor 1o is issued from the control box 11, and the cam rotation motor 10 rotates. As a result, the cam gear 6 rotates by a predetermined angle in the direction of the arrow until the tip of the cam groove 5a reaches position 14 shown by the dashed line, and then stops.

When the cam gear 5 rotates and stops, the retaining pin 7 provided on the tension arm 8 moves along the cam groove locus of the cam gear 5 so as to come into contact with the cam groove 5a of the cam gear 5. By moving to the position 711, the tension arm 8 rotates about the pin 6 in the direction of the arrow a, and the tension post stops at the position 1B.

In the above state, the tension of the magnetic tape 13 is released and becomes the state of the magnetic tape 16, and in this state, the control box 11 connects the rotary drum driving motor 1
A signal for rotation is issued to the rotary drum 7, and the rotary drum drive motor 17 rotates, whereby the rotary drum 4 starts rotating.

After the rotating drum 4 starts rotating, the control box 11 issues a signal to rotate the cam rotating motor 10 in the reverse direction, causing the cam rotating motor 10 to rotate in the reverse direction. The engaged cam gear 5 rotates in the direction of arrow C and returns to its original state, and the tension arm becomes the state of the tension arm 8, and the rotational force applied by the spring 9 causes the tension post to be rotated. 1 is the magnetic tape 16
By applying tension to and returning to the state of the magnetic tape 13, the magnetic tape 13, fixed post 2, movable post 3,
Contact with the rotating drum 4 is resumed, and recording and playback can be performed.0 The tension arm 8 is used to load the tape cassette from the tape cassette mounting position to the magnetic tape drive position together with the movable post 3, and It is well known that the loading operation of the tension arm 8 is performed by setting the shape and rotation angle of the cam portion of the geared gear 5.

Effects of the Invention As described above, according to the present invention, by temporarily releasing the tension of the magnetic tape, the starting torque of the rotating drum driving motor can be reduced, and the external size of the rotating drum driving motor can be reduced in size. In addition, power consumption can be reduced because it can be driven with small torque.

Furthermore, in side-opposed motors (rotor and stator face each other in the circumferential direction of the rotating shaft), which are generally used as rotating drum drive motors, it is possible to reduce torque fluctuations during rotation by lowering the torque. ,Therefore,
Coking (noise caused by torque fluctuations) can be reduced.

[Brief explanation of drawings]

FIG. 1 is a plan view of a main part of a rotary head type magnetic recording and reproducing apparatus according to an embodiment of the present invention, and FIG. 2 is a plan view of a main part of a conventional rotary head type magnetic recording and reproducing apparatus. 1... Tension post, 2... Fixed post, 3... Moving post, 4... Rotating drum, 5... Gear with cam, 5a ...Cam groove, 6...Pin, 7...Engagement pin, 8...
...Tension arm, 9...Spring, 1
0...Cam rotation motor, 11...Control box, 12...Power switch, 13...
Magnetic tape, 17...Rotating drum drive motor.

Claims (1)

[Claims] With the magnetic tape wound at a predetermined angle around a rotating drum with a built-in rotating head, the rotation of the rotating drum is stopped, and the tape tension of the magnetic tape is temporarily adjusted before rotating the rotating drum again. A rotary head type magnetic recording/reproducing device characterized by reducing the