JPS62184651A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To reduce the power required for driving a motor a rotary cylinder by driving the rotary cylinder for the fast forward rewinding in the intermediate loading state at a speed lower than the speed for the normal drive. CONSTITUTION:A cylinder drive circuit 1 is provided to a normal speed variable resistor 3, a low speed drive variable resistor 4 and a switch 5. The switch 5 is thrown to the position (a) at the recording/reproduction, the rotary cylinder motor 2 is driven at the normal speed, and the switch 5 is thrown to the position (b) by giving a control signal to change over the switch to the position (b) at the fast forward/rewinding state, and the rotary cylinder is driven at a low speed. Thus, the power consumption is saved and the tape running system is stabilized.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a magnetic recording/reproducing device that is capable of varying the speed of a rotating cylinder during intermediate loading.

2. Description of the Related Art Conventional household magnetic recording and reproducing apparatuses do not perform tape loading by fast forwarding or rewinding to pull out a magnetic tape from a cassette as shown in FIG. 2 and then loading it into a rotating cylinder. Therefore, the count display consisted of a mechanism that was simpler to display than the rotation of the reels. In addition, conventional magnetic recording and reproducing devices for professional use record control pulses for convenience during editing, and the time is displayed at 9 minutes.

Now displays seconds and frames. At that time, in order to display the time during fast forwarding and rewinding, a method has been adopted in which the magnetic tape is loaded intermediately as shown in FIG. 3, and the magnetic tape is pulled out slightly and brought into contact with the control magnetic head to read the control pulses. However, in the intermediate loading state, the magnetic tape comes into contact with the rotating cylinder, and in this state the magnetic tape is in fast forward mode.
Because it is rewound, if one video head remains in contact with the contact surface, the tape will be skewed on one side, and the state of contact with the magnetic tape will be different for both video heads, resulting in poor tape running. This prevents normal signal exchange during recording and playback. Therefore, in order to eliminate the uneven wear of the video head, the rotating cylinder was made to rotate steadily even during fast forwarding and rewinding. Normally, this operation is performed by applying a servo and rotating steadily during recording and playback.
Even when fast forwarding or rewinding, the servo was applied to keep it rotating steadily.

Problems to be Solved by the Invention However, in the method described above, the rotating cylinder is constantly rotated even during fast forwarding and rewinding in the intermediate loading state, so the power consumption required to drive the motor of the rotating cylinder is reduced during recording and playback. It was average.

In view of the above problems, the present invention reduces the power consumption required to drive the motor of the rotating cylinder by rotating the rotating cylinder at a lower speed than normal rotation during fast forwarding and rewinding in an intermediate loading state. The present invention provides a magnetic recording/reproducing device as described above.

Means for Solving the Problems In order to solve the above problems, the magnetic recording and reproducing apparatus of the present invention includes a rotating cylinder, a control magnetic head for reading control pulses recorded on a magnetic tape, and the control magnetic head. The rotating cylinder is rotated steadily (1
The configuration includes a switching circuit that allows the speed to be lower than 800 rpm.

Effect of the Invention With the above-described configuration, the present invention can reduce the speed of the rotating cylinder by lowering the free run frequency for servoing the rotating cylinder during fast forwarding and rewinding.

Embodiments Hereinafter, magnetic recording and reproducing apparatuses according to embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a block diagram of one embodiment of the invention.

In Fig. 1, 1 is a cylinder drive circuit for driving the motor of the rotary cylinder, 2 is a motor for rotating the rotary cylinder, 3 is a variable resistor for operating the cylinder drive circuit at steady rotation, and 4 is for operating at low speed rotation. 5 is a switch that switches the speed of the rotating cylinder according to a control signal.

The operation of the magnetic recording/reproducing apparatus configured as described above will be explained. Fig. 1 shows an embodiment configured to change the free run frequency for servoing the rotary cylinder. During recording and reproduction, the switch 6 is connected to side a and the rotary cylinder rotates steadily. , fast forward/
At the time of rewinding, if a control signal to switch to the b side is sent, the switch 6 is connected to the b side, and the rotary cylinder can rotate at a low speed.

As described above, according to this embodiment, by providing a rotational speed switching circuit using a switching device and a variable resistor, the rotating cylinder can be rotated at a low speed during fast forwarding and rewinding.

Effects of the Invention As described above, according to the present invention, when fast forwarding or rewinding in an intermediate loading state, the rotating cylinder rotates at a slower speed than the conventional steady rotation, so power consumption can be reduced and the tape running system can be stabilized. You can get excellent results such as:

[Brief explanation of drawings]

FIG. 1 is a block diagram of a magnetic recording/reproducing apparatus according to an embodiment of the present invention, FIG. 2 is a structural diagram showing tape loading in fast forward/rewind mode of a household magnetic recording/reproducing apparatus, and FIG. 3 is a block diagram of a magnetic recording/reproducing apparatus according to an embodiment of the present invention. FIG. 2 is a structural diagram showing tape loading in fast forward/rewind mode of a magnetic recording/reproducing device for business use. 1... Cylinder drive circuit, 2...
・Motor, 3... Variable resistance for steady rotation, 4...
...Variable resistance for low speed rotation, 5...Switcher.

Claims (1)

[Claims] a rotating cylinder, a control magnetic head that reads control pulses recorded on a magnetic tape,
A magnetic recording/reproducing device comprising a switching circuit that switches the rotational speed of the rotary cylinder to a rotation speed lower than steady rotation in a loading state in which the magnetic tape is brought into contact with the control magnetic head.