JPH02193349A - Tape running device - Google Patents

Abstract

PURPOSE:To avoid the deviation of tape running quantity and to attain accurate consecutive recording by applying a prescribed quantity of tape winding and tape rewinding prior to the tape rewinding and applying tape rewinding for consecutive recording. CONSTITUTION:When a PAUSE button is depressed during the video recording or in a standstill state, an operation button input circuit 12 sends a button input to a system control circuit 11. The circuit 11 controls a measuring control circuit 24 to store a present tape position to a storage and comparator 25 depending on the count of a capstan system counter 23 to inhibit the operation of a tape running counter 3. Then the circuit 11 controls a tape running control circuit 21 to feed a tape by a prescribed quantity. After the forward winding of a prescribed quantity, the circuit 11 controls the circuit 21 to reverse the capstan shaft. In this case, the circuit 25 obtains the restoration to the PAUSE button input position, and when the original position is restored, the circuit 11 restarts the count of the counter 3. Then the rewinding of the consecutive recording is entered and the tape of the required quantity is rewound to cause the standby state.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a video tape recorder (hereinafter referred to as VTR).
The present invention relates to a tape running device for a magnetic recording/reproducing device such as an audio tape recorder or an audio tape recorder, and particularly relates to a tape running device that can reliably operate a tape running counter or continuous shooting using control signals.

(Prior Art) In recent years, some magnetic recording and reproducing apparatuses, particularly VTRs, are equipped with a tape running counter or a repeat function as an editing function. The tape running counter counts the control signal and displays it as the amount of tape running. Also, the continuous jump can be paused (PA) during recording (RFC).
USE) and then record the next scene, there will be no gap between the previous recorded part and the newly recorded part, or the newly recorded part will overlap the previous recorded part. This enables continuous recording without laps and without disrupting the phase of the video signal at the boundaries.

Figure 3 explains the principle of continuous shooting.
) state, when the PAUSE button is pressed first, ■
Stops RFC operation and stops the tape. (2) The tape is rewound, and the control pulses (hereinafter referred to as CTL pulses) recorded on the tape are reproduced and counted. ■When the tape is rewound to a predetermined position (appropriate position), the tape is stopped and the tape goes into standby mode.

Then, when the PAUSE button is pressed again, ■ Play (
PLAY) mode, the tape is run, and the CT
L pulses are counted. (2) At the same time, the phases of the reproduced video signal and the newly recorded video signal are matched. (The servo system is used to control the vertical synchronization signals so that their phases match.

)■When the rewound number of CTL pulses are regenerated, the mode is automatically switched to RFC mode.

Continuous shooting is performed through the above steps.

By the way, in the tape running system of a VTR, a motor is used in the drive mechanism of the supply reel and take-up reel as a source for obtaining rotational nozzles, and one of the methods for transmitting the rotation of this motor to the reel is an idler. There is a transmission method to use.

In this transmission system, for example, a capstan motor is used as the drive source to drive the supply reel and take-up reel via an idler. During recording or playback, the idler is moved to the take-up reel side for winding and rewinding. Sometimes the idler is moved to the supply reel side and rotated in the opposite direction to wind it up. A so-called mechanism that swings an idler drives a supply reel or a take-up reel.

V of the structure that drives the reel using such an idler
In TR, when rewinding a continuous shooting operation, if the capstan motor is simply rotated in reverse, the tape cannot be wound until the idler moves from the take-up reel to the supply reel. During this time, the tape becomes slack and comes off the CTL head. It becomes impossible to regenerate the CLT pulse. In the tape running counter, when the tape is run in the opposite direction to that during recording and reproduction, the measured value is counted down accordingly, but since the CTL pulse is not reproduced, the count value deviates. Also, repeated decoys may cause malfunctions. Due to such defects, the VT of the above transmission method
In R, the pinch roller was removed from the capstan shaft, the main brake was applied to the reel stand, the capstan shaft was reversed, and the idler was moved from the take-up reel to the supply reel. However, by removing the -mark pinch roller, it was not possible to accurately determine the amount of tape movement, making it impossible to perform highly accurate editing.

(Problems to be Solved by the Invention) As described above, when performing a jumping operation in a VTR with a mechanism using an idler, the tape may come off the CTL head, the count value of the tape running counter may deviate, or the tape may be surrounded by a heavy tape. There was a problem that the process could not be carried out satisfactorily.

SUMMARY OF THE INVENTION Therefore, the present invention aims to eliminate the above-mentioned problems and provides a tape running device that can perform continuous dancing without any deviation in tape running distance (elapsed time) and that can perform accurate continuous dancing. This is the purpose.

[Structure of the Invention] (Means for Solving the Problems) The present invention applies rotational force from a drive source to a take-up reel or a supply reel via an idler that can alternatively contact the take-up reel or the supply reel. a reel drive means for driving the tape by a capstan and a pinch driven by a reversible capstan motor, the tape drive means for driving the tape in a first direction or vice versa; In the tape running device that runs the tape in a second direction, the capstan motor rotates to generate a pulse train corresponding to the movement area of the tape; 1 pulse counting means; storage means for storing the count value of the first pulse counting means; and setting of a counting period of the first pulse counting means;
a first pulse counting control means for controlling the recording and storage means; a pulse reproducing means for reproducing the pulses for counting the tape running distance recorded on the tape; and a second pulse group number means for counting the pulses from the pulse reproducing means. a second pulse counting control means for controlling the counting operation of the second pulse group number means; and a second pulse counting control means for controlling the counting operation of the second pulse set number means; controlling the reel driving means and the tape driving means to cause the tape to run in the first direction or the tape driving means; tape running control means for switching to a second direction; and when switching the tape running from the first direction to the second direction by reversing the capstan motor, counting the second pulses from the time when switching is instructed; The counting operation of the means is inhibited, and the counting operation is restarted when the tape is fed in the first direction for a predetermined period, then the tape is fed in the second direction and rewound to the position where the switching is instructed. 1. A control means for controlling a second pulse counting control means and a tape running control means.

(Function) In the present invention, when switching the running direction of the tape by the swinging mechanism using the idler, the tape is run in the first direction in advance for the time required for the swinging mechanism to move between the reels. After that, the tape can be rewound again to the original position and the second pulse counting means can accurately restart counting the tape running digits from that position, so that the count value of the tape running counter does not deviate and the seam is kept neat. Tsugiri can be realized.

(Example) The present invention will be described below based on the example shown in the drawings.

FIG. 1 is a block diagram showing a tape traveling device according to an embodiment of the present invention.

In the embodiment shown in this figure, a VTR in which a capstan motor is used as a drive source and reels are driven via an idler will be described. Code 1 is a CT that detects the CTL pulse recorded on the control track of the magnetic tape during recording.
This is an L head, and the detected CTL pulse is shaped by a waveform shaping circuit 2 and then supplied to a tape running counter 3. The tape running counter 3 measures the tape running time by counting the waveform-shaped CTL pulses. Count up/down and reset the tape running counter. Control such as prohibition of counting is performed by the measurement control circuit 4 based on a control signal from the system control circuit 11.

The tape running control circuit 21 is the system control circuit 1
The rotation control (including forward rotation and reverse rotation control) of the capstan motor is performed based on the control signal from 1. The pulse generation circuit 22 generates pulses (for example, FG pulses, FG stands for frequency generator) for detecting the rotation of the capstan motor, and supplies them to the capstan system counter 23.

The capstan system counter 23 counts the pulses of the pulse generating circuit 22. Memory and comparison circuit 25
stores the count value of the counter 23 and compares the count value with a predetermined value as necessary, and sends the calculation result to the system control circuit 11. The measurement control circuit 24 controls the count of the capstan system counter 23 based on the control signal from the system control circuit 11, and controls the storage and comparison circuit 25 as necessary.
Perform comparison control.

Further, the operation button input circuit 12 sends operation button inputs such as recording (RFC) and pause (PAUSE) to the system control circuit 11.

Next, the operation of the above device will be explained.

PAUS during recording (REC) or still (STILL)
When the E button is pressed, the operation button input circuit 12 inputs the PALISE button to the system control circuit 1.
Send to 1. The system control circuit 11 controls the measurement control circuit 24 to store the current tape position (the position when the PAUSE button is input) in the storage and comparison circuit 25 using the count value (FG pulse count value) of the capstan system counter 23. At the same time, the measurement control circuit 4 is controlled to prohibit the counter operation of the tape running counter 3. Next, the system control circuit 11 controls the tape running control circuit 21 to rotate the capstan shaft in the normal direction while keeping the pinch roller in the pressed state, so as to listen to the tape at a predetermined level. This predetermined amount is the amount of tape movement caused by the idler movement from the take-up reel to the supply reel when the capstan motor is reversed with the pinch roller in the crimped state, and the amount of tape movement caused by this movement. This is the sum of the tape winding nails required to wind up the tape slack. (Since the tape winding skewer differs depending on the tape position and tape load, it is necessary to give it more margin than the maximum slack winding skewer.) After the predetermined amount of forward winding is completed, the system control circuit 11 starts the tape running control circuit. 21 to reverse the capstan shaft while keeping the pinch roller in the pressed state. At this time, the memory and comparison circuit 25 stores the tape first (PAUS).
The return to the E button input position is determined by comparing the count value of the capstan system counter 23 (FG pulse count value), and when the return to the original position is reached, a signal is sent to the system control circuit 11, which causes the system to The control circuit 11 controls the measurement control circuit 4 to restart the counting operation (CTL pulse count) of the tape running counter 3. That is, a rewinding operation of ratio 11 is started here, the necessary amount of tape is rewound (a predetermined amount of CTL pulses are counted), and a standby state is entered. Then, when the PAUSE button is pressed again and PAUSE is released, the playback mode starts and CTL pulses are counted.
When the rewound number of CTL pulses are reproduced, the REC operation for the next scene is automatically started.

FIG. 2 explains the tape running state in the above-mentioned overlapping operation. The operation shown in this figure is the addition of the following operation to the conventional double encircling operation (FIG. 3).

That is, before performing tape rewinding, a predetermined amount of tape winding and tape rewinding operations are performed by FG pulse counting at the same time as the first PAUSE button input. After this operation waits for a period of time until the swinging mechanism by the idler moves, Dave rewinding for the transition dance is started.

By performing the above operation, when performing continuous rewinding operation with the pinch roller in the crimped state, tape slack may occur and the tape may come off the CTL head and no head output may be obtained. However, even if continuous rewinding is started, there will be no deviation in the count value of CTL pulses.

In the above embodiment, a case is explained in which rewinding is performed for double wrapping from a recording state, but the present invention is not limited to rewinding for double wrapping, but is also applicable to cases in which tape rewinding is simply performed after recording is completed. Of course, it can also be applied to This makes it possible to accurately count the tape without discrepancies when rewinding the tape.

Further, in the above embodiment, the tape position in the overlapped area is managed by counting the CTL pulses to 1, but it may also be done by counting the FG pulses of the capstan motor to 1. Even in that case, the accurate count value of the tape running counter is of course (q).

Further, in the above embodiment, a tape running device of a VTR is explained, but the present invention is applicable to an audio tape recorder, particularly a DAT (digital audio tape recorder).
It is possible to apply it to

[Effects of the Invention] As mentioned above, according to the present invention, when the tape is wound and unwound after recording, it is possible to eliminate the deviation in the count value of the tape running counter caused by switching the tape running direction. Therefore, in the joint dance movement,
Since the amount of tape travel is counted without deviation of the measuring pulse, it is possible to perform continuous shooting editing with high precision.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a tape running device according to an embodiment of the present invention, FIG. 2 is an explanatory diagram illustrating a tape running state during a continuous shooting operation in the device shown in FIG. 1, and FIG. FIG. 3 is an explanatory diagram illustrating a photographing operation. 1... Control head, 2... Waveform shaping circuit,
3...Tape running counter, 4.24...Measurement control circuit, 11...System control circuit, 12...Operation button input circuit, 21...Tape running control circuit, 22...Capstan Rotation detection pulse generation circuit, 23
...capstan system counter, 25...memory and comparison circuit. Figure 1 Figure 3 #Xu Clan Figure 2

Claims (1)

[Scope of Claims] Reel driving means for selectively transmitting rotational force from a drive source to the take-up reel or the supply reel via an idler that can selectively contact the take-up reel or the supply reel; In the tape running device, the tape driving device includes a capstan driven by a capstan motor and a tape drive means for driving the tape by a pinch roller, and switches and runs the tape in a first direction or a second direction opposite to the first direction. A pulse generating means for generating a pulse train according to the amount of tape movement by rotation of a capstan motor, a first pulse counting means for counting pulses from the pulse generating means, and a counter for the first pulse counting means. a storage means for storing numerical values; a first pulse counting control means for setting the counting period of the first pulse counting means and controlling the storage means; and a pulse for reproducing the tape running amount counting pulse recorded on the tape. a reproducing means; a second pulse counting means for counting pulses from the pulse reproducing means; a second pulse counting control means for controlling the counting operation of the second pulse counting means; the reel driving means; controlling the tape drive means;
tape travel control means for switching the tape travel from the first direction to the second direction; and tape travel control means for switching the tape travel from the first direction to the second direction;
When switching to the direction, the counting operation of the second pulse counting means is prohibited from the time when the switching is instructed, and after the tape is fed in the first direction by a predetermined amount, the tape is fed in the second direction, and the switching is performed. and a control means for controlling the first and second pulse counting control means and the tape running control means so that the counting operation is restarted when the tape is rewound to the instructed position. .