JPS63298745A - Half loading controller - Google Patents

Abstract

PURPOSE:To prevent deterioration of a magnetic tape by allowing a timer means to detect it when a half loading state of a magnetic tape is consecutive for a prescribed time and using a release means to release the half loading state. CONSTITUTION:When a predetermined prescribed time elapses without a magnetic tape driven, a command signal is sent from a timer 11 to a control circuit 10 and the control circuit 10 sends a half loading release signal to a loading motor drive amplifier 12. Then the loading motor drive amplifier 12 drives the loading motor 13 to release the half loading state. Thus, the magnetic tape is not left in the half loading state for a long time and the deterioration in the magnetic tape by the half loading is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application in Industry-1-] The present invention relates to a half-loading control device, and particularly to a device for controlling the half-loading state of a magnetic tape in a magnetic recording/reproducing device.

[Prior Art] FIG. 3 is a diagram showing a half-loading mechanism employed in a conventional magnetic recording/reproducing apparatus (hereinafter referred to as a VTR). In the figure, the conventional half-loading mechanism is
Its main components include a reel disk 1, a pinch roller 2, a full erase head 3, a guide roller 4,
6, a rotating drum 5 with a video head and a high-fidelity audio head, a control/audio head 7, a half loading pin 8, and a reel disk 9.

Next, the half-loading operation in the half-loading mechanism described above will be explained. In the case of a VTR, the arrangement is as shown in FIG. 3 when no magnetic tape cassette is installed. When the magnetic tape cassette is inserted, the half-loading bin 8 moves from position A to position B at the time of insertion, bringing the magnetic tape into close contact with the control/audio rad 7. Also, in the playback state,
Guide rollers 4 and 6 move from positions C and E to position F, respectively, to wind the magnetic tape around drum 5 and bring it into close contact with control/audio head 7. This also applies to the recording state, pause, frame advance, and search state. In the case of fast forwarding and rewinding, etc., it is the same as when the previous half loading bin 8 is at position B.

As described above, since the magnetic tape is always in close contact with the control/audio controller 7 due to the half-loading mechanism, the control signals recorded on the magnetic tape can be read out continuously in response to the running of the magnetic tape. becomes possible. By converting the read control signal into time, the travel distance of the magnetic tape can be displayed in time.

[Problems to be Solved by the Invention] The conventional half-loading mechanism enters a half-loading state when a cassette tape is inserted, and this state is not released even if the power is turned off. Therefore, if a cassette tape is left stored for a long time, tension is applied to the magnetic tape by the half-loading bin 8, causing the tape to stretch.

There were problems such as deterioration such as bottle marks and scratches.

The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a half-loading control device that can prevent deterioration of a magnetic tape due to long-term half-loading.

[Means for Solving the Problems] The half-loading control device according to the present invention includes a timer unit that starts measuring time from the start of the half-loading state, and a timer unit that starts measuring time from the start of the half-loading state, and a timer unit that starts measuring time from the start of the half-loading state, and when the timer unit measures a predetermined fixed time, A release means for releasing the half-loading state is provided.

[Operation] In the present invention, when the half-loading state of the magnetic tape continues for a certain period of time, this is detected by the timer means, and the half-loading state is released by the release means, thereby preventing deterioration of the magnetic tape.

[Embodiment] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the following embodiments, the same mechanical part for half loading as the conventional one shown in FIG. 3 is used.

FIG. 1 is a schematic block diagram showing a half-loading control device according to an embodiment of the present invention. In the figure, a control circuit 10 is for controlling the operation of the half-loading mechanism shown in FIG. 3, and is constituted by, for example, a microcomputer. A timer 11 configured by, for example, a microcomputer is connected to this control circuit 10. This timer 11 is for measuring the duration of the half-loading state of the magnetic tape. Further, a loading motor drive amplifier 12 is connected to the control circuit 10. The output of the loading motor drive amplifier 12 is given to the loading motor 13.

The loading motor 13 is connected to the half loading bin 8
It is for driving.

FIG. 2 is a flowchart for explaining the operation of the embodiment shown in FIG. The operation of the above embodiment will be described below with reference to FIG.

First, when a cassette tape (not shown) is loaded into the half-loading mechanism shown in FIG. SL). Accordingly, the loading motor drive amplifier 12 is connected to the loading monitor 13.
Outputs a drive signal to. As a result, the loading motor 13 rotates, and the half loading bin 8 moves from position A to position B shown in FIG. Therefore, the magnetic tape in the cassette is in a half-loading state. Next, the control circuit 10 sends a timer reset signal to the timer 11 to reset the timer 11 (step S2). Subsequently, the control circuit 10 sends a timer start signal to the timer 11 to start measuring time (step S3). After the timer 11 starts, when a predetermined period of time (for example, 5 minutes) passes without the magnetic tape running, the timer 11 sends an instruction signal to the control circuit 10, and the control circuit 10 starts loading. A half-loading release signal is sent to the motor drive amplifier 12 (steps S4 to S6). In response, the loading motor drive amplifier 12 drives the loading motor 13 to release the half-loading state, and the half-loading pin 8 returns from position B to position A in FIG. On the other hand, if the magnetic tape becomes running due to a tape operation or the like before the timer 11 has elapsed for 5 minutes, the timer 11 is reset at that point, and the timer 11 starts again when the magnetic tape stops running (step S4 .S2.S3).

Further, when the user turns off the power switch of the VTR, the half-loading state is canceled directly in step S6. This further ensures the protection effect of the magnetic tape. Note that the timer 11 has a standby power source that is generated when the power outlet is turned on, so when the user turns off the power switch, the timer 11 must send a half-loading release signal to the loading motor drive amplifier 12. Bye.

[Effects of the Invention] As described above, according to the present invention, since the magnetic tape is not left in a half-loaded state for a long time, deterioration of the magnetic tape due to half-loading can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a schematic block diagram showing one embodiment of the present invention. FIG. 2 is a flowchart for explaining the operation of the embodiment shown in FIG. FIG. 3 is a diagram showing a half-loading mechanism in a conventional VTR. In the figure, 1 is a reel disk, 2 is a pinch roller,
3 is a full erase head, 4 is a guide roller, 5 is a drum, 6 is a guide roller, 7 is a control/audio head, 8 is a half loading pin, 9 is a reel disk, 10 is a control circuit, 11 is a timer, 12 is a loading A motor drive amplifier, 13 indicates a loading motor.

Claims (2)

[Claims] (1) A device for controlling a half-loading state of a magnetic tape in a magnetic recording and reproducing device, comprising: timer means for starting time measurement from the start of the half-loading state; and a timer means for controlling a predetermined period of time. A half-loading control device, comprising a release means for releasing the half-loading state of the magnetic tape when time is counted. (2) The half-loading control device according to claim 1, wherein the release means further releases the half-loading state of the magnetic tape when the power of the magnetic recording/reproducing device is turned off.