JP3624830B2 - Magnetic recording / reproducing device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a magnetic recording / reproducing apparatus having a function of eliminating, for example, tape slack caused when a power failure occurs.
[0002]
[Prior art]
When the cassette tape is loaded into the magnetic recording / reproducing apparatus and the tape is run, for example, if a power failure occurs, the S and T reels (S on the tape supply side and S on the take-up side) after the power failure. (Referred to as T) continues to rotate due to inertia, and the tape is in a slack state. If playback, recording, fast-forwarding or rewinding operations are performed at the time of power failure recovery in such a state, an excessive load is applied to the tape and the tape is damaged. Alternatively, a safe operation may be performed so as not to damage the tape. In this case, even if an operation request for recording or the like is made next, the operation corresponding to the request may not be performed.
In order to prevent this, it is generally known to perform a winding operation of the tape. However, as a judgment to finish the winding operation, a winding operation for a certain time or a T-side reel is used. It is known that a winding operation is performed by rotating the S-side reel in a state in which the winding braking is applied to the motor, and the winding operation is terminated when the rotation of the S-side reel is no longer detected.
[0003]
[Problems to be solved by the invention]
Some conventional magnetic recording / reproducing apparatuses always perform a winding operation for a fixed time (for example, one minute) after the recovery from the power failure, regardless of the amount of tape slack that occurs when the power failure occurs. This fixed time is set in consideration of the maximum amount of tape slack that can be assumed, and the set time in this case can eliminate tape slack even if the maximum possible tape slack occurs. It's time.
For this reason, even if the tape does not loosen so much and the slack can be eliminated by, for example, about 1 second after the recovery from the power failure, the remaining time (for example, 59 seconds) does not make sense. It will continue. There is a need to reduce this extra time and the extra tape run associated therewith.
Further, as a judgment to end the winding operation, the winding operation is performed by rotating the S side reel while the winding braking is applied to the T side reel, and the winding is performed when the rotation of the S side reel is not detected. When the operation is finished, there is a problem that by applying braking to the reel on the T side, an excessive load is applied at the moment when the slack of the tape disappears, and the tape may be damaged.
In addition, after the winding is completed, the tape position is shifted in the direction of the starting end, and therefore there is a problem that when the recording operation is started, the previously recorded portion is erased by overwriting.
In a video deck equipped with a mechanism that cannot arbitrarily brake a reel, when the power is restored from a state in which the tape is slack due to a power failure or the like, The purpose is to reduce the extra time and the amount of winding in the operation.
Another object of the present invention is to control the amount of overwriting by recording after correcting the difference between the tape position after the slack removal operation and when the power is restored, so that the previously recorded portion is not erased.
[0004]
[Means for Solving the Problems]
The present invention in order to solve this problem, the S-side reel for supplying tape, the T-side reel for taking up the tape, and the S-side reel rotation detecting means for detecting the rotation of the S-side reel, the T-side reel and T-side reel rotation detecting means for detecting rotation of, convey the power of the capstan on one of the S-side reel and the T-side reel, and a tape winding mechanism for a tape winding operation, the tape winding operation When the rotation of the S-side reel is no longer detected by the S-side reel rotation detection means, or when the rotation of the T-side reel is detected by the T-side reel rotation detection means during Cow until the take-up control means having a function of determining a stop, the tape winding operation stop from the time of power restoration input pulses from the T-side reel rotation detecting means Storing as a target value was collected, and a tape feeding means for performing by the amount tape feeding operation of at least the target value by rotating the capstan in the forward direction after said tape winding operation.
When these means are used, it is possible to reduce the extra time elapsed and the extra tape running associated with the slack removal without braking the reel. Also, since no excessive load is applied at the moment when the tape is no longer loose, the tape is not damaged.
[0005]
In addition, the record immediately before the power failure can be prevented from being erased in the record after the winding operation.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
According to a first aspect of the present invention, the S-side reel for supplying tape, the T-side reel for taking up the tape, and the S-side reel rotation detecting means for detecting the rotation of the S-side reel, the T-side and T-side reel rotation detecting means for detecting the rotation of the reel, convey the power of the capstan on one of the S-side reel and the T-side reel, and a tape winding mechanism for a tape winding operation, tape winding When the rotation of the S-side reel is no longer detected by the S-side reel rotation detecting means during operation, or when the rotation of the T-side reel is detected by the T-side reel rotation detecting means and winding control means having a function of determining the stop of operation, between the input pulses from the T-side reel rotation detecting means from the time of power restoration to the tape winding operation stop counter And stored as a target value, and a magnetic recording and reproducing apparatus having a tape feeding means for performing by the amount tape feeding operation of at least the target value of the capstan is rotated in the forward direction after said tape winding operation It has the effect of reducing the extra time that accompanies the slack removal and the extra tape running without braking the reel. In addition, there is an effect that the record immediately before the power failure is not erased in the record after the winding operation.
[0007]
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0008]
(Embodiment 1)
FIG. 1 is a block diagram showing a schematic configuration of a magnetic recording / reproducing apparatus showing an embodiment of the present invention.
[0009]
In FIG. 1, reference numeral 1 denotes a tape loaded in a magnetic recording / reproducing apparatus, and shows a state where the tape is pulled out from the tape cassette 2 by the loading posts 6 and 7 and wound around the rotary drum 5. That is, the tape 1 is pulled out from the S-side reel 3, wound around the rotating drum 5 through one loading post 6, and the T-side reel through the other loading post 7, pinch roller 9, capstan 8, and the like. 4 is wound up. However, various posts such as a back tension post, an erasing head, a control head, and the like are not shown. The driving of the S and T side reels 3 and 4 is performed by transmitting the capstan power to either the S or T side reel via the idler mechanism 16. The idler mechanism 16 moves so as to abut one of the reels by a mechanism (not shown) that operates according to the rotation direction of the capstan 8. The capstan 8 is driven and controlled by a capstan motor drive circuit 10. The capstan motor drive circuit 10 performs drive control based on a drive control signal from the system controller 11.
[0010]
Further, power is supplied from the power supply circuit 14 to the system controller 11. Therefore, the system controller 11 stops its operation when the supply of power from the power supply circuit is stopped (such as a power failure), and starts operating when the supply of power is resumed. The system controller 11 is configured to control the initialization operation of the mechanism during the start process and perform the tape winding operation on the S-side reel 3 during the initialization operation. When the reel pulse from the T reel sensor 13 is input during the winding operation, or when the reel pulse from the S reel sensor 12 is not input during the winding operation, the system controller 11 It is determined that the slack of 1 has been removed, and the winding operation is stopped and the control is shifted to the operation (unloading) following the initialization operation of the mechanism. That is, the winding control means is realized by the system controller 11, and the system controller 11 includes software.
Next, the operation of the magnetic recording / reproducing apparatus having the above configuration will be described with reference to the operation flowcharts of FIGS.
If, for example, a power failure occurs while the tape 1 is running while the tape cassette 2 is loaded in the magnetic recording / reproducing apparatus, the tape 1 is pulled out and wound around the rotating drum 5, the system controller 11 becomes uncontrollable at that time. On the other hand, the rotating S-side reel 3 and T-side reel 4 continue to rotate due to inertia after a power failure, and then stop. Therefore, if the power supply is suddenly cut off while the tape 1 is running, the pulled-out tape 1 becomes loose.
When the power failure is restored in this state, the system controller 11 resumes the operation and starts the mechanism initialization operation (step S3). In the initialization operation, a winding operation for rotating the S-side reel 3 in the winding direction is performed (step S4). This winding operation is performed until it is determined that the slack has been removed, and after the completion of winding, the mechanism initialization operation is continued. For example, unloading and loading are performed to complete the mechanism initialization operation (step S5). ). The step of determining that the slack at this time has been removed (step S4) is a characteristic part of the present embodiment, and the contents thereof will be shown below.
First, when the power is restored (step S1), an operation of counting up by interruption of an input pulse from the T reel sensor 13 of the T side reel 4 is started (step S2) when the system controller 11 starts operation. Next, the initialization operation of the mechanism is started (step S3), and the winding operation is started in the process (step S4). The process of the winding operation (step S4) will be described below with reference to FIG.
First, the S-side reel 3 is rotated to the winding side (step S41), and the slack of the tape 1 is removed. If the tape 1 is slack while the S-side reel 3 is rotating, the S-side reel 3 rotates, so that a reel pulse is input from the S reel sensor 12 at a constant period. At this time, the T-side reel 4 does not rotate because it is structured to rotate depending on the tape running, so that the reel pulse from the T-side reel sensor 13 is not input to the system controller 11. Therefore, the system controller 11 monitors the reel pulses input from the S and T reel sensors 12 and 13 (repeats steps S42 and S43).
If the S-side reel 3 is continuously wound, the tape 1 will eventually become loose. When the slack disappears, the reels 3 and 4 on both sides of S and T both rotate or both stop depending on the driving force for winding the tape 1 and the reel tape winding diameter. . Therefore, either a pulse is input from the reel sensor 13 of the T-side reel 4 (YES in step S42) or no pulse is input from the reel sensor 12 of the S-side reel 3 (YES in step S43). It becomes such a state. The system controller 11 monitors the reel pulses input from the S and T reel sensors 12 and 13 and confirms that either of the conditions is satisfied. Is stopped (step S44). Here, the count-up value of the T-side reel pulse is stored (step S45), and then the count-up value of the T-side reel pulse is cleared (step S46).
That is, according to the magnetic recording / reproducing apparatus of the present embodiment, even in a mechanism in which the reel cannot be braked, it is possible to detect that the slack has been eliminated by monitoring the rotation of the reel. Since the winding operation is stopped and the operation proceeds to the next operation after the mechanism initialization process when the slack is eliminated, the wasteful winding time as in the prior art is not required and the feeding amount of the tape 1 can be reduced. Further, since the reel 1 is not braked, the tape 1 will not be damaged by applying excessive tension to the tape 1 at the moment when the tape 1 is no longer slack.
[0011]
(Embodiment 2)
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
When the winding operation represented by the first embodiment is performed, the tape position is shifted toward the start end from the time of occurrence of a power failure. If the operation is shifted to the recording operation as it is, the portion recorded before the power failure is overwritten, and the video immediately before the power failure is erased.
In FIG. 1, pulses input to the T-reel sensor 13 from the power recovery are counted up and stored when the winding operation is finished, and set as a target value at a position where recording is started later. When shifting to the recording operation after the end of the winding operation, the deck is in the short RECPLAY state (the short RECPLAY state is the same as the running state of the tape 1 and the mechanical state is the REC state. The pulse input to the T reel sensor 13 is counted up while the tape 1 is fed in the end direction by the capstan 8. The count-up value is compared with the target value. When the count-up value and the target value are the same, it is determined that the position of the tape 1 is the same as when the power failure is restored, and the deck is shifted from the short RECPLAY state to the recording state. At this time, if there is a large difference between the target value and the value to be counted up, the rotational speed of the capstan 8 is set faster to shorten the time required to reach the target tape position. Further, if the time from the recovery from the power failure monitoring to the transition to the recording operation becomes too long, the transition to the recording is made without waiting for the determination of the tape position, and the maximum time of the non-recording time is guaranteed.
Next, the operation of the present embodiment in the magnetic recording / reproducing apparatus having the above configuration will be described with reference to the operation flowcharts of FIGS.
When there is a recording request (step S6) to the deck at the time when the initialization operation of the mechanism mentioned in the first embodiment is completed, the tape position is corrected (S7), and the recording after the correction operation is performed. Start (step S8). Step S7 for correcting the tape position at this time is a characteristic part of this embodiment, and its flow is shown in FIG. 4, and the contents thereof will be described below.
First, when there is a recording request (step S6) when the initialization operation is completed, the deck is shifted to the short RECPLAY state (step S71). After shifting to the short RECCPLAY state, the time from the power recovery is confirmed (step S72), and if it reaches an arbitrary time, recording is started (step S8). This is to guarantee the longest time from power recovery to recording.
If this time has not been reached, the target value stored in step S45 is compared with the current T reel pulse count-up value (step S73).
At this time, if the current count value is smaller than the target value, the magnitude of the difference is judged (step S74). If the difference is large, the tape position needs to be changed greatly, so the time spent for correcting the tape position. In order to shorten the time, the rotation speed of the capstan 8 is increased to feed the tape 1 at a high speed (step S75).
In step S73, the current value is smaller and the magnitude of the difference is judged (step S74). If the difference is small, the rotation speed of the capstan 8 is the same as that in the short RECCPLAY state so that the recording operation can be started immediately. (Step S76).
If the current count value is equal to or larger than the target value in step 73, the tape position correcting operation is terminated and recording is started (step S8).
That is, according to the magnetic recording / reproducing apparatus of the present embodiment, the amount of overwriting by controlling the difference between the tape position after completion of the slack removal operation and when the power is restored is controlled to record the previously recorded portion. It has an excellent effect of not erasing.
[0012]
【The invention's effect】
As described above, according to the present invention, the winding operation can be stopped and the next operation can be started when the tape is loosened, so that no unnecessary winding time and winding amount are generated. In addition, since it is not necessary to brake the T-side reel, it can be realized even with a deck that does not have a mechanism for braking the reel, and it does not damage the tape because excessive tension is not applied at the moment when the slack is released. .
Further, according to the present invention, recording can be started from the position of the tape whose power has been restored, and recording can be started without erasing the image immediately before the occurrence of a power failure.
[Brief description of the drawings]
FIG. 1 is a block diagram of a magnetic recording / reproducing apparatus according to an embodiment of the present invention. FIG. 2 is a flowchart showing an overall operation of the embodiment. FIG. 3 is a flowchart showing a winding operation of the embodiment. Flowchart showing the tape position correcting operation of the embodiment
DESCRIPTION OF SYMBOLS 1 Tape 2 Tape cassette 3 S side reel 4 T side reel 5 Rotating drums 6 and 7 Loading post 8 Capstan 9 Pinch roller 10 Capstan motor drive circuit 11 System controller 12 S reel sensor 13 T reel sensor 16 Idler mechanism

Claims (2)

An S- side reel for supplying the tape ;
A T-side reel for winding the tape ;
And S-side reel rotation detecting means for detecting the rotation of the S-side reel,
T-side reel rotation detecting means for detecting rotation of the T-side reel;
Convey the power of the capstan on one of the S-side reel and the T-side reel, and a tape winding mechanism for a tape winding operation,
When the rotation of the S-side reel is not detected by the S-side reel rotation detection means during the tape winding operation, or when the rotation of the T-side reel is detected by the T-side reel rotation detection means, A winding control means having a function of determining the stop of the tape winding operation;
The input pulse from the T-side reel rotation detecting means is counted from the time of power recovery until the tape winding operation is stopped and stored as a target value, and after the tape winding operation, the capstan is rotated in the forward direction. A magnetic recording / reproducing apparatus comprising a tape feeding means for performing a tape feeding operation at least by the target value . 2. The magnetic recording / reproducing apparatus according to claim 1, wherein the time from the power recovery is monitored and if the predetermined time has elapsed, the tape feeding operation is terminated and the recording operation is started .

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