KR950009778B1 - Tape driving error alarm - Google Patents

Abstract

detecting whether a supply reel is normally rotated during a video tape runs; detecting a current running mode after displaying an error state, if the supply reel or a take-up reel is stopped; rewinding the video tape towards the take-up reel, if the current running mode is a rewinding mode, and keeping a constant tension of the video tape to rewind the tape; and stopping the deck after displaying an error state, if not the rewinding mode, and executing a fast forward winding, if the running mode is a fast forward winding mode after removing the error state.

Description

VRL tape drive failure alarm / control method

1 is a configuration diagram of a conventional tape running system.

2 is a waveform diagram of a conventional reel pulse detection signal.

3 is a flowchart of a conventional tape drive failure alarm / control method.

4 is a flowchart of a tape drive failure alert / control method of the present invention.

5 is a control graph of the tape traveling speed according to the present invention.

* Explanation of symbols for main parts of the drawings

1: Key input unit 2: Microcomputer

3: deck drive part 5: video tape

6: video drum 7: supply reel

8: take-up reel 11, 12: black and white contrast plate

13,14: optical sensor 15: waveform shaping unit

The present invention relates to a tape drive failure alarm / control method for detecting and alarming a video tape drive failure (JAM) caused by a driving error of a tape traveling system in a deck of a VCR. It is about.

In the deck portion of a conventional VCR, the video tape traveling system is configured as shown in FIG.

That is, the key input unit 1 for operating the VCR function, the microcomputer 2 performing VCR control corresponding to the function selection of the key input unit 1, and the deck driving the deck unit under the control of the microcomputer 2 The driving unit 3, the A / V processing unit 4 which performs recording / reproducing processing of audio / video signals under the control of the microcomputer 2, and the video tape 5 by driving the deck driving unit 3; A video drum (6) for recording a signal or reproducing the recorded signal, a supply reel (7) for supplying a video tape (5) to the video drum (6) side, and the video tape (5). A take-up reel (8) for winding, a pinch roller (9) and a capstan post (10) for constant running of the video tape (5), and rotation with the reel to detect rotation of the reels (7) (8) The black and white contrast plates 11 and 12 and the black and white contrast plates 11 and 12 are irradiated with light to reel pulses. The optical sensor (13) 14, the waveform shaping unit (15) for shaping the output of the optical sensor (13) and the output to the microcomputer (2), and the driving guide of the video tape (5). It consists of a number of posts 16 for.

The traveling control operation of the video tape is as follows.

When signals such as playback, recording, fast forward (FF) and rewind (REW) are input to the microcomputer 2 through the key input unit 1, the drum 6 and the capstan system 9 (through the deck driving unit 3) ( 10) the supply reel 7 and the take-up reel 8 are driven, and correspondingly, the video tape 5 is driven along a predetermined path to the post 16.

The audio / video signal reproduced during driving is signaled by the A / V processing unit 4 and output to a monitor, a speaker, or the like.

During this driving operation, the sur- reel 7 and take-up reel 8 rotate, and the black and white discs 11 and 12 are rotated together with the black and white discs 11 and 12 from the optical sensors 13 and 14. The optical pulse according to the rotation of) is sensed, and the optical pulse is shaped into a reel pulse as shown in FIG. 2 by the waveform shaping unit 15 and supplied to the microcomputer 2.

The armature 2 detects an input portion of the reel pulse to determine the operating state of the current traveling system.

This operation will be described with reference to the flowchart shown in FIG.

First, the microcomputer 2 determines whether the rising edge or the falling edge of the supply reel pulse is detected, and when detected, the microcomputer 2 restores the detection time of the edge time to the supply reel monitoring counter and detects the take-up reel pulse. The detection time is detected and the monitoring time is updated and stored in the take-up reel monitoring counter.

After that, if the count value becomes “0” (or BORROW detection) during the given monitoring time TS while decrementing the supply counter value by 1, the running of the tape 5 is stopped due to the fault of the odometer, and the supply reel (7) ) Is judged as not rotating and stops the deck after warning display.

In addition, if the count value becomes “0” (or BORROW detection) during the given monitoring time (TK) while decreasing the take-up reel counter value by 1, it is determined that the take-up reel 8 is stopped as described above. Let's do it.

Here, the counter value can be a processing frequency of the built-in microcomputer 2.

That is, if the reel is not rotated for a predetermined time (count value) while driving while monitoring the rotation of the supply reel 7 and the take-up reel 8, the transfer error (JAM) to the video tape 5 as shown in FIG. ), And the deck drive is stopped to protect the tape and odometer.

1 shows that the supply reel 7 winds the tape 5 and the take-up 8 supplies the tape 5 at the time of REW, and the video tape 5A is inserted between the pinch roller 9 and the capstan post 10. It shows an error occurrence when it is wrinkled.

When such an error occurs, conventionally, only the automatic stop of the deck is performed after the alarm, and thus the rewinding video tape is left in a running state in the traveling system. Therefore, it is inconvenient to overcome the defective transfer of the tape through manual operation. There is this.

The present invention detects a driving error of a video tape, and if an error is detected, rewinds a predetermined number of times depending on whether the video tape is fast-forwarded and rewound in the odometer, and at a reel driving speed that is gradually increased at regular time intervals. It aims to provide a VCR tape drive alarm / control method that allows fast-forwarding and rewinding to minimize damage to video tapes and automatically overcome them when errors occur.

The alarm / control method of the present invention for achieving the above object will be described with reference to the flowchart shown in FIG.

First, the microcomputer 2 detects the supply reel pulses (rising edge or poly) input from the supply reel 7 through the black and white contrast plate 11 and the optical coupler 13 while driving the video tape 5 as described above. Edge).

When the supply reel pulse is detected, the monitoring time is updated and stored in the supply reel monitoring counter, and if the detection of the take-up reel pulse is determined as described above, the monitoring time is updated and stored in the take-up reel monitoring counter.

Subsequently, the counting value of the supply reel monitoring counter and take-up reel monitoring counter is decreased by 1 to determine whether or not the supply reel monitoring counter value is "0" to determine whether there is a driving error, where the monitoring counter value is "0". The reason for determining whether the authorization is as follows.

If the supply reel is rotated normally without the fault of the odometer, the rising edge and the falling edge are continuously detected from the supply reel pulse supplied to the microcomputer 2, and the monitoring time is re-stored in the supply reel counter value each time. When the value does not fall to "0", and when the supply system 7 stops due to a bad driving system, the supply reel pulse is not supplied to the microcomputer 2, and thus the supply reel counter value is the supply reel pulse. This is because 1 is decremented by 1 when no supply is made, and the counter value becomes “0”.

That is, when the monitoring time count value Ts of the reel pulse input as shown in FIG. 2 becomes "0" through the down count, a supply error pulse may not be detected due to a driving error, and the reel may be detected within this time value Ts. If a pulse is detected, the count value is updated with a new time value, so the tape is in normal running (as viewed from the supply reel side).

The driving failure detection process as described above is a driving that occurs when the supply reel 7 and the take-up reel 8 rotate at the normal speed to transfer the video tape 5 or during the fast forward and rewind by forward / reverse rotation. All are applied to fault detection.

Then, the driving failure 5A occurs while the supply reel 7 and the take-up reel 8 perform the process of resolving the driving failure (driving error) 5A detected by the driving failure detection process as described above. The case will be described as an example.

First, when the result of the determination indicates that the supply reel audit count value is “0”, it is determined whether the current rewind mode is present.

As a result of judgment, if rewind mode is displayed, reel error display is performed, and the rewind attempt counter value with initial value of "0" is increased by +1, and this value is compared with the predetermined reference number (e.g. 4 times).

If less than the reference number of times, the microcomputer 2 controls the deck driving unit 3 to the unloading state and drives the capstan motor forward to drive the video tape 5A to rewind on the take-up reel 8 side. .

When the reel driving is in progress, the supply reel 7 winds up the video tape 5A and a driving error 5A is generated. Accordingly, the pinch roller 9 and the capstan post 10 are driven up and down by the capstan motor. Is supplied to the video tape 5A, and the number of rewinds is to be repeated four times as described above.

Once the take-up reel 8 is fully wound with the stretched video tape 5A, the supply reel 7 which is winding the video tape from this time will be rotated.

This is determined from the detection of the supply reel pulse, and when the supply reel pulse is detected, the sagging video tape 5A has been restored. The microcomputer 2 controls the drive unit 3 to stop the forward rotation of the capstan motor and display a warning. After releasing, the original rewind (REW) is performed again through the high speed reverse rotation of the capstan motor and the reverse rotation of the supply reel (7).

Then, it is determined what operation was performed immediately before the driving failure 5A occurred.

In this case, since the rewinding operation is taken as an example, the discrimination result is rewinded. Therefore, as shown in FIG. 5, the rewind (REW) driving speed of the video tape 5 is rotated from a low speed as shown in FIG. The medium-speed, high-speed, incremental speed increases the rewind with minimal tape impact.

That is, if the rewind time is earlier than the low speed drive time T1, the deck is driven and controlled to rewind the video tape 5 at low speed until the time T1 elapses, and the low speed drive time T1 is performed. When the elapsed time has elapsed, the video tape 5 is rewinded to a medium speed until the second speed driving time T2 has elapsed. After the elapse of the medium speed driving time T2, the video tape 5 is operated at a high speed. Drive to complete the rewind.

This stepwise driving speed control of the video tape 5 is performed by the same process as above even when a driving error occurs and is currently driving fast forward (FF).

That is, when the supply reel monitoring count value determination is not the current rewind mode, and when the value of the take-up reel monitoring counter value is "0" (that is, an error of the take-up reel 8), both warnings are issued. After the display, the deck is stopped and then the mode of the fast forward (FF) and rewind (REW) is performed.In the case of fast forward, the running speed of the video tape 5 is increased step by step in the same manner as in the above rewind. It will let you.

As described above, according to the present invention, when the driving error of the video tape occurs, in particular, when the error occurs during the rewinding, the error can be automatically overcome. After that, the driving speed can be gradually increased to complete the rewinding, thus increasing the convenience and operational reliability of the VCR.

In addition, when an error occurs, it can immediately overcome the problem, minimize the damage to the video tape, and the overload condition of the odometer can be released in a short time to protect the parts and extend the life of the device through it.

Claims (4)

video. A first process of determining whether the supply reel is normally rotated while the video tape is being driven; a second process of determining a current driving mode after displaying an error if the supply reel or take-up reel is stopped; In the REW mode, the third step of rewinding the video tape to the take-up reel to maintain a constant tension of the tape, and then rewind the REW and rewinding the driving mode determination result in the second step. If it is not in REW) mode, the deck drive is stopped after the error display and if the driving mode is fast forward (FF) mode after the error is cleared, VRA's tape drive failure alarm is performed. Control method. The method of claim 1, wherein a V-Tal tape drive failure alarm / control method for causing a video tape to increase gradually at a low speed and a high speed in re-execution of the REW or fast forward FF in the third process . The method of claim 1, wherein the V-drive tape drive failure alarm / control method of driving a speed of gradually increasing the video tape from low speed to high speed when rewinding or rewinding in the fourth process. 2. The method of claim 1, wherein the number of retries of rewinding the video tape to the take-up reel in the third process is repeated to a predetermined number of times.