JP2774540B2 - Tape running device - Google Patents

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 traveling device of a magnetic recording / reproducing device such as an audio tape recorder and an audio tape recorder, and more particularly to a tape traveling device using a control signal or a tape traveling device capable of reliably performing a continuous shooting operation.

(Related Art) In recent years, there is a magnetic recording / reproducing apparatus, particularly a VTR, provided with a tape running counter or a continuous shooting function as an editing function. The tape running counter counts the control signal and displays it as a tape running amount. In addition, pause is paused during recording (REC) (PAUSE)
When recording the next scene, there should be no gap between the previous recorded part and the part to be newly recorded, or the part to be newly recorded overlaps the previous recorded part This makes it possible to perform continuous recording so that there is no error and the phase of the video signal is not disturbed at the boundary.

Fig. 3 explains the principle of continuous shooting.
C) When PAUSE button is pressed first, REC
Stop the operation and stop the tape. The tape is rewound, and at this time, control pulses (hereinafter, referred to as CTL pulses) recorded on the tape are reproduced and counted.
After being rewound to a predetermined position (appropriate position),
Stops the tape and goes into a standby state.

When the PAUSE button is pressed again, playback (PLA
Y) mode is set, the tape is run, and the CTL pulse is counted. At the same time, the phases of the reproduced video signal and the newly recorded video signal are matched. (Control is performed by the servo system so that the phase of the vertical synchronizing signal matches.) When the number of rewinding CTL pulses is reproduced, the mode is automatically switched to the REC mode.

 As described above, the continuous shooting is performed.

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

In this transmission method, for example, a supply reel or a take-up reel is driven via an idler using a capstan motor as a drive source. During recording or playback, the idler is moved to the take-up reel side to take up and rewind. At times, the idler is moved to the supply reel side and rotated in the reverse direction to wind up. A so-called idler swinging mechanism drives the supply reel or the take-up reel.

The reel is driven using such an idler.
When rewinding a continuous shooting operation in a VTR, simply rotating the capstan motor in the reverse direction will not allow the tape to be wound until the idler moves from the take-up reel to the supply reel. C
The LT pulse cannot be reproduced. In the tape running counter, when the tape runs in the opposite direction to that during recording / reproduction, the measured value is counted down accordingly, but the count value is shifted because the CTL pulse is not reproduced. It also causes malfunctions in continuous shooting. Due to such a problem, in the transmission type VTR, the pinch roller is once removed from the capstan shaft, the main brake is applied to the reel base, the capstan shaft is reversed, and the idler is moved from the take-up reel to the supply reel. Was. However, once the pinch roller is removed, the amount of movement of the tape cannot be accurately obtained, and high-accuracy editing cannot be performed.

(Problems to be Solved by the Invention) As described above, in a VTR of a mechanism using an idler,
When performing continuous shooting, the tape comes off the CTL head,
There has been a problem that the count value of the tape running counter is deviated or that the continuous shooting cannot be performed satisfactorily.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a tape traveling device capable of eliminating a deviation of a running amount (elapsed time) of a tape in a continuous shooting operation and capable of performing an accurate continuous shooting. It is assumed that.

[Constitution of the Invention] (Means for Solving the Problems) The present invention relates to a reel drive unit for selectively transmitting a rotational force from a drive source to a take-up reel or a supply reel according to a rotation direction thereof, and a control unit. In a tape traveling device comprising a capstan driven by a rotatable capstan motor and tape driving means for driving a tape by a pinch roller, and switching the tape to a first direction or a second direction opposite thereto in a tape traveling device, Tape running control means for controlling the reel driving means and the tape driving means to switch the running of the tape to the first direction or the second direction; and changing the running direction of the tape from the first direction to the second direction. Instruction means for giving an instruction to switch to the direction of the tape; and receiving the instruction from the instruction means, feed the tape in the first direction by a predetermined amount, and then run the tape in the second direction. It said configured by a control means for controlling the tape running control means.

(Operation) In the present invention, when the running direction of the tape is switched by the swing mechanism using the idler, the tape is caused to run in the first direction in advance for a time necessary for the swing mechanism to move between the reels. Thereafter, the tape is rewound to the original position again, and the tape running amount counting by the second pulse counting means can be restarted accurately from that position, so that the count value of the tape running counter does not deviate and the seam is clean. Shooting can be realized.

(Examples) Hereinafter, the present invention will be described based on examples shown in the drawings.

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

In the embodiment shown in this figure, a VTR of a system in which a capstan motor is used as a drive source and a reel is driven via an idler will be described. Reference numeral 1 denotes a CTL head for detecting a CTL pulse recorded on a control track of a magnetic tape at the time of recording. 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 calculates the tape running time by counting the waveform-shaped CTL pulses.
Control such as counting up / down, count reset, and count inhibition of the tape running counter is performed based on a control signal from the system control circuit 11 in the measurement control circuit 4.
Do.

The tape running control circuit 21 is a system control circuit 11
The control of the rotation of the capstan motor (including the control of the normal rotation and the reverse rotation) is performed based on the control signal from the controller. The pulse generation circuit 22 is a pulse for detecting the rotation of the capstan motor (for example, FG pulse, FG is a frequency generator)
Is generated and supplied to the capstan system counter 23. The capstan counter 23 counts the pulses of the pulse generation circuit 22. The storage and comparison circuit 25 stores the count value of the counter 23 as necessary and compares the count value with a predetermined value, and sends the calculation result to the system control circuit 11. The measurement control circuit 24 controls the count of the capstan counter 23 based on a control signal from the system control circuit 11 and performs storage / comparison control of the storage and comparison circuit 25 as necessary.

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

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

When the PAUSE button is pressed during recording (REC) or stationary (STILL), the operation button input circuit 12 sends a PAUSE button input to the system control circuit 11. 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 based on the count value of the capstan counter 23 (the count value of the FG pulse). At the same time, the measurement control circuit 4 is controlled to inhibit 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 forward while the pinch roller is in the pressure-bonded state and to feed the tape by a predetermined amount. The predetermined amount is the amount of movement of the tape accompanying the idler movement from the take-up reel to the supply reel when the capstan motor is rotated in the subsequent operation while the pinch roller is in the crimped state, and is generated by this movement. This is the sum of the tape winding amount required for winding the tape slack. (Because the tape take-up amount differs depending on the tape position and tape load, it is necessary to allow more space than the maximum slack take-up amount.)
After the specified amount of forward winding is completed, the system control circuit
11 controls the tape running control circuit 21 to reverse the capstan shaft while keeping the pinch roller pressed. At this time, the position (PAUSE
Returning to the button input position) is determined by comparing the count value of the capstan counter 23 (the count value of the FG pulse), and when returning to the original position, a signal is sent to the system control circuit 11, which performs system control. The circuit 11 controls the measurement control circuit 4 to restart the count operation (CTL pulse count) of the tape running counter 3. That is, the rewinding operation of the continuous shooting is started at this point, and a necessary amount of the tape is rewound (a predetermined amount of CTL pulse is counted), and a standby state is set. When the PAUSE button is pressed again to cancel PAUSE, the playback mode is set and the CTL
When the pulses are counted and the number of rewinding CTL pulses is reproduced, the REC operation of the next scene is automatically started.

FIG. 2 illustrates the tape running state in the above-described continuous shooting operation. The operation shown in this figure is obtained by adding the following operation to the conventional continuous shooting operation (FIG. 3). That is, before tape rewinding, a predetermined amount of tape rewinding and tape rewinding operations are performed by the FG pulse count simultaneously with the initial PAUSE button input. After performing this operation until the idler swing mechanism moves, the tape rewinding for the continuous shooting is started.

By performing the above operation, when performing the rewinding operation of the continuous shooting with the pinch roller in the crimped state, there is a case where the tape becomes slack and the tape comes off the CTL head and the head output cannot be obtained. Even when the rewinding is started, the count value of the CTL pulse does not shift.

In the above-described embodiment, the case where rewinding for continuous shooting is performed from the recording state is described. However, the present invention is not limited to rewinding in continuous shooting and may be performed simply when tape rewinding is performed after recording is completed. Of course, it can be applied. This makes it possible to realize accurate tape counting without counting deviation when rewinding the tape.

Further, in the above-described embodiment, the tape position is managed in the continuous shooting by counting the CTL pulse, but may be performed by counting the FG pulse of the capstan motor.
Even in such a case, an accurate count value of the tape running counter can be obtained.

Further, in the above-described embodiment, the tape traveling device of the VTR has been described, but the present invention can be applied to a DAT (Digital Audio Tape Recorder) in an audio tape recorder or the like.

[Effects of the Invention] As described above, according to the present invention, in the case of rewinding after tape recording, it is possible to eliminate the deviation of the count value of the tape running counter caused by switching the tape running direction. . Therefore, in the continuous shooting operation, the count pulse indicating the tape running amount is counted without deviation, so that high-accuracy continuous shooting editing can be performed.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a tape running device according to one embodiment of the present invention, FIG. 2 is an explanatory diagram for explaining a tape running state of a continuous shooting operation in the device shown in FIG. 1, and FIG. FIG. 9 is an explanatory diagram illustrating an 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 ... storage and comparison circuit.

Claims (1)

(57) [Claims] 1. A tape driving means for driving a tape by a capstan driven by a capstan motor rotatable in forward and reverse directions and a pinch roller, and a take-up reel for changing the rotational force of the capstan motor in accordance with the direction of rotation. Alternatively, in a tape traveling device provided with a reel driving means for selectively transmitting the tape to a supply reel, the tape traveling apparatus switches the tape in a first direction or a second direction opposite thereto, and controls the reel driving means and the tape driving means. And
Tape traveling control means for switching the traveling of the tape to the first direction or the second direction; instruction means for giving an instruction for switching the traveling direction of the tape from the first direction to the second direction; Receiving the instruction of the means, further driving the capstan motor so that the tape runs in the first direction by a predetermined amount, and after running the predetermined amount, rotates the capstan motor in the reverse direction to rotate the tape in the first direction. And a control means for controlling the tape running control means so as to run the tape running apparatus in the two directions.