JPH033146A - magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To fix the take-up strength of a supplying reel irrespective of the winding diameter of the supplying reel by optionally varying the take-up strength of the supplying reel at the time of winding a tape around a rotary drum. CONSTITUTION:When a cassette 20 is loaded to the supplying reel 14 and a take-up reel 15, a magnetic tape 16 is pulled out from the cassette 20 by an intermediate loading arm 10. At this time, the electric current in a motor 3 is controlled in a direction of taking up the tape 16 by the control signal of a control circuit 1. And simultaneously, the reel 14 is rotated only by the same quantity as the tape 16 is pulled out from the intermediate loading 10. A reel pulse from a generator 4 is counted by a counter 5. And then, the take-up strength of the reel 14 at the time of winding the tape 16 around the drum 6 by the loading post 7 can be fixed irrespective of the winding diameter of the reel 14 by discriminating the winding diameter of the reel 14 on the basis of the value counted by the counter 5 in the control circuit 1.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to reel control of a magnetic recording/reproducing device.

BACKGROUND OF THE INVENTION In recent years, high performance and high quality have been desired for commercial VTRs, and tape damage has become a critical issue for commercial equipment, which is a key to quality.

A reel servo control circuit of a conventional magnetic recording/reproducing device will be explained below.

FIG. 2 shows a simple mechanical configuration. FIG. 3 shows a block diagram of a conventional reel servo. First, in Fig. 2, 6 is a rotating drum, 1e is a magnetic tape,
7 is a loading post for winding the magnetic tape 16 around the rotating drum 6, 8 is an input/C head for recording and reproducing audio signals on the magnetic tape 16, 9 is a capstan, and 1Q is an input/C head for the input/C head 8. An intermediate loading arm for applying the magnetic tape 16, 11 a pinch roller, 12 a post for stabilizing the running of the magnetic tape 16, and 13 a tension arm for stabilizing the tape tension. Further, 14 is a supply reel for sending out the magnetic tape 16, 15 is a take-up reel for winding up the magnetic tape 16, and 20 is a cassette.

Further, in FIG. 3, 17 is a reel control circuit, 1B is a reel drive circuit, and 19 is a supply reel motor.

The operation of the reel servo circuit configured as described above will be described below.

First, in FIG. 2, the cassette 20 is placed on the supply reel 14
9 When the magnetic tape 16 is loaded onto the take-up reel 16, the intermediate loading arm 10 loads the magnetic tape 16 from within 2 degrees of the cassette.
is brought out. At that time, the reel control circuit 17 shown in FIG.
The supply reel 19 is controlled by the reel drive circuit 18 in accordance with the control signal, and a constant current is controlled in the direction in which the magnetic tape 16 is wound. Next, the magnetic tape 16 is placed on the rotating drum 6.
When winding the reel with the loading post 7, the reel control circuit 17
The supply reel 19 is controlled by the reel drive circuit 18 in accordance with the control signal, and a constant current is controlled in the direction in which the magnetic tape is wound.

Problems to be Solved by the Invention However, in the above conventional configuration, when winding the magnetic tape around the rotating drum using the loading post, in order to control the constant current in the direction in which the magnetic tape is wound by the supply reel, the cassette on the supply reel side is The winding force is not constant depending on the tape winding diameter, and the larger the winding diameter on the supply reel side, the smaller the winding force, which may cause the magnetic tape to fall from the loading post, or vice versa. The smaller the winding diameter, the greater the winding force, which has the disadvantage of potentially damaging the magnetic tape by the loading post.

The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide a constant winding force regardless of the winding diameter of the supply reel when winding a magnetic tape around a rotating drum using a loading post. do.

Means for Solving the Problem In order to achieve this object, the magnetic recording and reproducing apparatus of the present invention includes a pull-out mechanism for pulling out the magnetic tape stored in a cassette, a loading mechanism for winding the magnetic tape around a rotating drum, and a loading mechanism for winding the magnetic tape around a rotating drum. The apparatus includes a supply reel for supplying the tape, a supply reel pulse generator for generating pulses proportional to the number of revolutions of the supply reel, and a counter for counting the number of pulses for the supply reel. .

Effect: With this configuration, the winding of the supply reel when the loading mechanism winds the magnetic tape around the rotating drum is determined according to the count value of the counter of the supply reel pulse generator when the magnetic tape in the cassette is loaded with the pull-out mechanism. The grip force can be changed arbitrarily.

EXAMPLES Hereinafter, examples of the present invention will be described with reference to the drawings.

FIG. 1 shows a block diagram of a reel servo in an embodiment of the present invention.

In FIG. 1, 1 is a reel control circuit, 2 is a reel drive circuit, 3 is a supply reel motor for winding the magnetic tape, and 4 is a supply reel pulse that generates a pulse proportional to the rotation speed of the supply reel motor. Generator 6 is a counter that counts reel pulses.

The operation of the block diagram of the reel servo configured as above will be explained below.

First, it will be explained with reference to the mechanical configuration diagram shown in FIG.

In FIG. 2, when the cassette 2o is loaded onto the supply reel 14° and the take-up reel 16, the intermediate loading arm 10 pulls out the magnetic tape 16 from within the cassette 2o. At this time, constant current control is performed to control the supply reel motor 3 by the reel drive circuit 2 in the direction of winding the magnetic tape 16 in accordance with the control signal from the reel control circuit 1 shown in FIG. At the same time, the supply reel 3 rotates by the amount by which the intermediate loading arm 10 pulls out the magnetic tape 1e. Supply reel pulse generator 4 at that time
Count the reel pulse from counter 5. Next, the magnetic tape 16 is loaded by the loading post 7 shown in FIG.
The reel control circuit 1 determines the winding diameter of the supply reel 14 based on the count value of the counter 6, and determines the winding force of the supply reel 140 when winding the supply reel 140 around the rotating drum 6.
4. Keep it constant regardless of the winding diameter.

As described above, according to the present embodiment, there are provided a pull-out mechanism for pulling out the magnetic tape 16 stored in the cassette 20, a loading mechanism for winding it around the rotating drum,
a supply reel for supplying the magnetic tape; a pulse generator proportional to the number of revolutions of the supply reel; a counter for counting the number of pulses on the supply reel; Depending on the count value of the reel pulse generator counter,
The loading mechanism makes it possible to keep the winding distance of the supply reel constant when winding the magnetic tape around the rotating drum, regardless of the winding diameter of the supply reel.

Effects of the Invention As described above, the present invention includes a pull-out mechanism for pulling out a magnetic tape stored in a cassette and a loading mechanism for winding it around a rotating drum, and a supply reel for feeding the magnetic tape; The supply reel pulse generator is provided with a supply reel pulse generator proportional to the number of revolutions of the supply reel, and the supply reel pulse generator is provided with a counter that counts the number of supply reel pulses. The winding force of the supply reel when winding the magnetic tape by the loading mechanism can be varied according to the count value of the supply reel, that is, the winding diameter.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a reel servo of a magnetic recording/reproducing apparatus according to an embodiment of the present invention, FIG. 2 is a mechanical configuration diagram, and FIG. 3 is a block diagram of a reel servo of a conventional magnetic recording/reproducing apparatus. 1...Reel control circuit, 2...Reel drive circuit, 3...Supply reel motor, 4
...... Supply reel pulse generator, 5...
counter circuit.

Claims (1)

[Claims] A pull-out mechanism for pulling out a magnetic tape stored in a cassette, a loading mechanism for winding it around a rotating drum, a supply reel for supplying the magnetic tape, and generating a pulse proportional to the number of rotations of the supply reel. a supply reel pulse generator that counts the number of reel pulses from the supply reel pulse generator; a counter that counts the number of reel pulses from the supply reel pulse generator; A magnetic recording and reproducing apparatus characterized in that the loading mechanism arbitrarily varies the winding force of the supply reel when winding the magnetic tape around the rotating drum.