JPS60145550A - State displaying method of magnetic tape device - Google Patents

Abstract

PURPOSE:To constitute the titled magnetic tape device so that an operating state of said device can be monitored by an operator from the outside, by displaying a movement of the magnetic tape by a display lamp, etc. CONSTITUTION:An output of a tachometer formed as one body with a motor for driving a magnetic tape is inputted to a counter 6 from a terminal B, and from the counter 6, a counted-down signal is sent to a flip-flop 7. On the other hand, a clock is inputted from a terminal A, and the flip-flop 7 repeates set and reset at every one rotation of a motor 1. An output of the flip-flop 7 drives a driver 9 through an OR circuit 8, and when the flip-flop 7 is set, a light emitting diode 10 is turned on, and when it is reset, said diode is turned off, and accordingly, the light emitting diode 10 repeats flickering at every one rotation of the motor 1. Also, the diode 10 is turned off when the motor is stopping, and remains turned on when the magnetic tape is being loaded.

Description

Detailed Description of the Invention <a> Technical Field of the Invention The present invention relates to a magnetic tape device using a cassette-type magnetic tape, and in particular a structure in which the movement of the magnetic tape cannot be monitored from the outside because it uses a video tape. The present invention relates to a method for displaying the status of a magnetic tape device, which displays the movement of the magnetic tape on an indicator lamp or the like.

(b) Prior Art and Problems Conventionally, even when a magnetic tape device uses a cassette-shaped magnetic tape, its movement can be seen from outside the magnetic tape device. Therefore, it was possible for the operator to check whether the magnetic tape was moving or not. However, when a video tape is used, the movement of the magnetic tape cannot be seen from outside the magnetic tape device due to its structure. In video equipment and audio equipment that use video tape, it is clear that the equipment is working because images and sounds are produced even if the movement of the magnetic tape is not known. However, when a magnetic tape device exchanges information with a computer, the operator is completely unaware of the operational status of the magnetic tape, which has the drawback of hindering investigation in the event of a failure.

(C) Object of the Invention The object of the present invention is to eliminate the above-mentioned drawbacks by displaying the movement of the magnetic tape on an indicator lamp, etc., so that the operator can monitor the operating status of the magnetic tape. The purpose is to provide a display method.

(d) Structure of the Invention The structure of the present invention is that, in a magnetic tape device in which the operating state of the magnetic tape cannot be monitored from outside the device, means is provided to display the rotation of the magnetic tape drive motor, and the motor is stopped. The light inside is off, the light flashes repeatedly in proportion to the rotational speed while the motor is rotating, and remains lit while the magnetic tape is being loaded.

(e) Embodiments of the Invention In the present invention, when the motor that drives the magnetic tape is stopped, the indicator lamp is off, and when the magnetic tape is automatically loaded, the indicator lamp is lit continuously, and the magnetic tape is While running, it blinks in proportion to the rotational speed of the motor, and the amount of tape can be determined based on the difference in the time interval between the blinks.

FIG. 1 is a block diagram of a circuit showing one embodiment of the present invention. An output of N pulses per revolution is input to a frequency dividing circuit 3 from a tachometer 2 integrated with a motor 1 for driving a magnetic tape. The frequency dividing circuit 3 divides the frequency of the pulse into 1/H and sends one pulse per rotation of the motor to the display circuit 4.

The display circuit 4 causes the display lamp 5 to blink based on the one pulse.

FIG. 2 is a detailed circuit diagram of the frequency dividing circuit 3, display circuit 4, and display lamp 5 shown in FIG. The output of the tachometer 2 enters the counter 6 from the terminal B, and the counter 6 counts down the output N pulses of the tachometer 2 to 1/N and sends it to the flip-flop 7. A clock is input from terminal A, and the flip-flop 7 repeats cents and reset every rotation of the motor 1. The output of this flip-flop 7 is the OR circuit 8
When the flip-flop 7 is turned on, the light-emitting diode 10 is turned on, and when it is reset, the light-emitting diode 10 is turned off. Therefore, the light emitting diode 10 repeats blinking each time the motor 1 rotates.

A drive signal for motor 1 that drives the magnetic tape is input from terminal C, and when motor 1 is not being driven, flip-flop 7 is input.
Clear. Therefore, when the motor 1 is not rotating, the light emitting diode 10 is off. The output from the terminal is “0” while motor J is being driven, and “1” while loading the magnetic tape.
" signal is input and drives the driver 9 through the OR circuit 8. Therefore, the light emitting diode 10 remains lit while the magnetic tape is being loaded.

<r> As described in detail, the present invention keeps the light-emitting diode lit while the magnetic tape is being loaded, repeatedly flashes to distinguish the light-emitting diode while the magnetic tape is running, and when the motor is stopped. The operational status of the magnetic tape can be monitored by turning off the light. Also, the blinking time of the light emitting diode differs depending on the rotational speed of the magnetic tape drive motor, so if the running speed of the magnetic tape is constant, the rotational speed of the motor changes depending on the amount of magnetic tape wrapped, so the blinking time changes. It will also be possible to determine the amount of magnetic tape Oeni has.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a circuit showing one embodiment of the present invention, and FIG. 2 is a detailed circuit diagram of the frequency dividing circuit, display circuit, and display lamp of FIG. 1.

Claims (1)

[Claims] A method for displaying the status of a magnetic tape device, characterized by turning off the light when the magnetic tape drive motor is stopped, repeatedly blinking in proportion to the rotational speed while the motor is rotating, and remaining lit while loading the magnetic tape.