JPH0528580A - Tape rolling-in preventing device for magnetic tape device - Google Patents

Abstract

PURPOSE:To prevent a magnetic tape from being rolled into a rotating drum cylinder at the time of condensation with easy constitution in reference to a magnetic tape device. CONSTITUTION:This magnetic tape device is provided with a reel 2 taking up a magnetic tape 1, a reel 3 supplying the magnetic tape 1 and a rotating drum cylinder 4 loading the magnetic tape 1. After either of the taking-up reel 2 or the supplying reel 3 is locked so as not to rotate and the magnetic tape 1 is loaded to a rotating drum cylinder 4, the rotating drum cylinder 4 is rotated. When it does not rotated, reproducing/recording operation is stopped hereafter.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic tape device. Particularly, it is an object of the present invention to prevent the magnetic tape from being caught in the rotating drum cylinder during dew condensation.

[0002]

2. Description of the Related Art In a tape recorder (DAT, VTR, etc.) having a drum rotating cylinder, a magnetic tape pulled out from a cassette case in which a reel for winding the magnetic tape and a reel for supplying the magnetic tape are housed in the drum rotating cylinder. When dew condensation occurs on the drum rotary cylinder when the drum rotary cylinder is rotated and played back after winding loading, the magnetic tape cannot be played back by being wound around the drum rotary cylinder. In such a case, the reproduction cannot be simply performed, and the magnetic tape, the rotating drum cylinder, or the like may be damaged. When condensation occurs on the drum rotation cylinder in this way, a condensation sensor is provided to prevent the magnetic tape from being wound around the drum rotation cylinder. It is inoperable below 0 ℃,
There was a disadvantage that a dew condensation sensor had to be provided.

In order to solve the above disadvantages, the reel on which the magnetic tape is loaded on the rotating drum cylinder and the winding side and both sides of the supply side or the supply side are fixed,
If the rotating drum cylinder is rotated in the normal direction and the rotating drum cylinder idles, it is determined that no condensation has occurred,
After that, it is assumed that the reproduction is performed, but if the rotating drum cylinder does not rotate, dew condensation occurs, and it is assumed that the rotating drum cylinder and the magnetic tape adhere to each other due to the dew condensation, and the reproduction is stopped thereafter. Since this method does not fix the magnetic tape at the time of loading the magnetic tape, there is a disadvantage that the position to be reproduced is shifted by loading or unloading the magnetic tape stored in the cassette case.

In order to solve the above disadvantages, the reel side to be wound is fixed, the reel to be supplied is released, the magnetic tape is loaded on the rotary drum cylinder, and thereby the position to be reproduced is fixed. After that, both sides of the reel to be wound and the supply side or the supply side are fixed, and the rotating drum cylinder is rotated in the normal direction.If the rotating drum cylinder idles, no dew condensation occurs.If not, it is determined that dew condensation has occurred. Was there.

[0005]

However, according to the tape wind-up prevention device for magnetic tape reproduction in which the take-up reel side is fixed, at least when the magnetic tape is loaded and then the rotary drum cylinder is rotated, it is taken up. There is a problem in that it is necessary to switch the fixed lock to supply the fixed reel. That is, both the take-up reel and the supply reel need to have fixed locks for preventing rotation, and structural simplification is required from the viewpoint of manufacturing cost.

SUMMARY OF THE INVENTION Therefore, in view of the above problems, it is an object of the present invention to provide a tape winding prevention device for a magnetic tape device which can prevent the winding of the magnetic tape into the rotating drum cylinder due to dew condensation with a simple structure.

[0007]

In order to solve the above problems, the present invention has a magnetic tape having a reel for winding a magnetic tape, a reel for supplying the magnetic tape, and a rotating drum cylinder into which the magnetic tape is loaded. In the apparatus, either the winding reel or the supply reel is locked so as not to rotate, the magnetic tape is loaded on the rotating drum cylinder, and then the rotating drum cylinder is rotated.
When the rotary drum cylinder does not rotate, the subsequent reproducing or recording operation is stopped.

A pinch roller for preventing the movement of the magnetic tape is provided between the supply reel and the rotating drum cylinder, the winding reel is locked so as not to rotate, and the magnetic tape is loaded on the rotating drum cylinder. The lock drum is unlocked, and the pinch roller prevents the magnetic tape from moving, thereby rotating the rotary drum cylinder in the normal direction. When the rotary drum cylinder does not rotate, the reproducing or recording operation is stopped thereafter. Good.

[0009]

According to the tape winding-in prevention device of the magnetic tape device of the present invention, either the winding reel or the supplying reel is locked so as not to rotate and the magnetic tape is loaded into the rotating drum cylinder. The playback or recording start position of the magnetic tape becomes constant. After loading the magnetic tape on the rotating drum cylinder, rotate the rotating drum cylinder in the opposite direction to the normal rotation direction to lock the reel to be wound up. By rotating in the rotating direction, the presence or absence of rotation of the rotary drum cylinder is detected, and when it does not rotate, it is determined that dew condensation has occurred, and the subsequent reproduction or recording operation is stopped. If it rotates, no dew condensation has occurred, so playback or recording operation is performed. In this way, the occurrence of dew condensation can be detected by locking either the take-up reel or the supply reel so as not to rotate. When locking the take-up reel, if the magnetic tape is fixed with a pinch roll provided on the supply side, the rotating drum cylinder can be rotated in the normal rotation direction to detect the presence or absence of rotation. .

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a tape winding prevention device of a magnetic tape device according to a first embodiment of the present invention. The configuration of this figure will be described. The tape winding-in prevention device of this figure includes a magnetic tape 1, a reel 2 for winding the magnetic tape 1, a supply reel 3 for supplying the magnetic tape, a rotary drum cylinder 4 for reading the magnetic tape 1, and a magnetic tape 1. A loading roller 6 for winding around the rotating drum cylinder 4, a pinch roller 7 for adjusting the running speed of the magnetic tape 1, a capstan 8, and a loading for detecting loading of the magnetic tape 1 onto the rotating drum cylinder 4. A detector 9, a rotation detector 10 for detecting the rotation speed of the rotary drum cylinder 4, a rotation drive unit 11 for rotating the rotary drum cylinder 4, and a lock unit 12 for blocking the rotation of the take-up reel. A drive unit 13 for driving the loading roller 6, a cassette case 14 for accommodating the take-up reel 2 and the supply reel 3, and a loading case. The signals from the output device 9 and the rotation detector 10 are input, and the rotation drive unit 11 and the lock unit are input.
And a control unit 15 that controls twelve.

Next, the operation of this embodiment will be described. FIG. 2 is a flow chart for explaining the operation of the first embodiment. As shown in the figure, when the cassette tape 14 is inserted into the magnetic tape reproducing device (step 1), the controller 15 confirms from the signal from the rotation detector 10 that the rotating drum cylinder is stopped (step 1). 2). After this confirmation, the control unit 15 locks the take-up reel 2 by the lock unit 12 to prevent its rotation (step 3). After that, the magnetic tape 1 in the cassette case 14 is pulled out from the cassette case 14 by the control unit 15, and the loading roller 6 is driven by the loading roller drive unit 13 and wound around the rotary drum cylinder 4 (step 4). The control unit 15 determines whether the loading state is normal or abnormal from the signal from the loading detector 9 (step 5). If the loading is normal, the control unit 3
Then, the rotary drive unit 11 rotates the rotary drum cylinder 4 in a direction opposite to the normal rotation direction shown in FIG. 1 (step 6). If the loading is normal, the position of the magnetic tape 1 is loaded to the position before unloading, which is housed in the cassette case 14. In this case the take-up reel (2) remains fixed. The control unit 15 judges from the signal from the rotation detector 10 whether the rotating drum cylinder 4 is rotating in the opposite direction at a constant speed (step 7),
If it is rotating, the rotation is stopped, the rotation is returned to the normal direction, the lock portion 12 is unlocked, and the normal reproduction or recording operation is performed (step 9). When it is determined in step 5 that the loading is abnormal (failure), the subsequent operations are stopped and the cassette tape 14 is ejected (step 10). If it is determined in step 7 that the rotary drum cylinder 4 is not rotating at a constant speed, dew condensation is detected, the subsequent operation is stopped, and the cassette tape 14 is ejected (step 11).

FIG. 3 is a diagram showing a tape winding-in prevention device of a magnetic tape device according to a second embodiment of the present invention. In the configuration shown in the figure, what is different from the first embodiment is a lock portion 16 provided in place of the lock portion 12 for preventing the rotation of the supply reel (3). Next, the operation of this embodiment will be described. FIG. 4 is a flow chart for explaining the operation of the second embodiment. The overlap with the steps of FIG. 2 will be briefly described. As shown in the figure, the tape is inserted into the cassette case 14 (step 1), the rotation of the rotating drum cylinder 4 is confirmed to be stopped (step 2), the reel of the supply side reel 3 is fixed (step 3), and the tape loading operation is performed. Is started (step 4). If loading is normal,
(Step 5) The rotary drum cylinder 4 starts to rotate with the supply side reel fixed (step 6), and if the rotary drum cylinder 4 rotates at a constant speed (step 7), the reproducing or recording operation is started (step 8). ). If the loading is abnormal in step 5, the supply reel 3 is unfixed (step 9).
This is because there is a case where it cannot be loaded because it is not wound. After this cancellation, the loading operation is performed again (step 10), and if the loading is normal, the process proceeds to step 6 (step 11). This is because loading is possible after the cancellation. If the loading fails, the subsequent operation is stopped and the cassette case 14 is removed (step 12). If the drum does not rotate at the constant speed in step 7, it is detected that dew condensation has occurred and the subsequent operation is performed. Is stopped, and processing such as removal of the cassette case 14 is performed (step 13).

FIG. 5 is a diagram showing a tape winding-in prevention device of a magnetic tape device according to a third embodiment of the present invention. The configuration in this drawing differs from that of the first embodiment in that the pinch roller 5, the roller 17 that faces the pinch roller and has a function as a capstan, for example, the respective capstan rollers 17 and 7, and the magnetic A roller drive unit 18 for driving the rollers 5 and 8 to sandwich the tape 1.
And 19.

Next, the operation of this embodiment will be described. FIG. 6 is a flow chart for explaining the operation of the third embodiment. Similar steps to those described above will be briefly described. As shown in the figure, the tape is inserted into the cassette case 14 (step 1), the rotation of the rotary drum cylinder 4 is confirmed to be stopped (step 2), and the take-up reel 2 is locked by the lock portion 12 to perform the tape loading operation. Start (step 3). If the loading is normal (step 4), the pinch roller 5 is turned on after the start of this operation, whereby the magnetic tape 1 is sandwiched and fixed to the cap stun roller 17 and prevented from running (step 5). in this case,
The rollers 8 of the cap stun 7 may be turned on at the same time. The magnetic tape 1 is fixed by the pinch roller 5 and the rotary drum cylinder 4 starts to rotate (step 6). If the rotary drum cylinder 4 rotates at a constant speed (step 7), the reproducing or recording operation is started (step 8). ). Step 4
If the loading is unsuccessful, the subsequent operation is stopped and the cassette case 14 is ejected (step 9). Similarly, if the drum does not rotate at the constant speed in step 7, it is detected that dew condensation has occurred, the subsequent operation is stopped, and the cassette case 14 is removed (step 10).

[0015]

As described above, according to the present invention, either the take-up reel or the supply reel is locked so as not to rotate, and the magnetic tape is loaded in the rotary drum cylinder 4 in the locked state or after the magnetic tape is loaded. Fix the magnetic tape with the pinch roller and rotate the rotating drum cylinder,
Since the dew condensation is detected based on whether the rotating drum cylinder is rotating or not, the dew condensation can be detected with one lock, and the structure can be simplified.

[Brief description of drawings]

FIG. 1 is a diagram showing a tape winding-in prevention device of a magnetic tape device according to a first embodiment of the present invention.

FIG. 2 is a flowchart for explaining the operation of the first embodiment.

FIG. 3 is a diagram showing a tape winding prevention device of a magnetic tape device according to a second embodiment of the present invention.

FIG. 4 is a flowchart for explaining the operation of the second embodiment.

FIG. 5 is a diagram showing a tape winding-in prevention device of a magnetic tape device according to a third embodiment of the present invention.

FIG. 6 is a flowchart for explaining the operation of the third embodiment.

[Explanation of symbols]

1 ... Magnetic tape 2 ... reel to wind 3 ... Supply reel 4 ... Rotating drum cylinder 5 ... Pinch roller

Claims (2)

[Claims] 1. A reel (2) for winding a magnetic tape (1)
And a reel (3) for supplying the magnetic tape (1) and a rotating drum cylinder (4) on which the magnetic tape (1) is loaded.
A magnetic tape device having a magnetic tape (1) loaded on the rotating drum cylinder (4) by locking either the winding reel (2) or the supply reel (3) so as not to rotate. A tape winding prevention device for a magnetic tape device, characterized in that the rotary drum cylinder (4) is rotated, and when the rotary drum cylinder (4) is not rotated, the subsequent reproduction or recording operation is stopped. 2. A reel (2) for winding a magnetic tape (1)
And a reel (3) for supplying the magnetic tape (1) and a rotating drum cylinder (4) on which the magnetic tape (1) is loaded.
In a magnetic tape device having a magnetic tape device, a pinch roller (5) for preventing movement of the magnetic tape (1) is provided between the supply reel (3) and the rotating drum cylinder (4), and the winding reel (2) is After locking the magnetic tape (1) so as not to rotate and loading the magnetic tape (1) on the rotating drum cylinder (4), the lock is released to further prevent the magnetic tape (1) from moving by the pinch roller (5). The rotating drum cylinder (4) is rotated in a normal direction, and when the rotating drum cylinder (4) does not rotate, the reproducing or recording operation is stopped thereafter, and a tape winding prevention device for a magnetic tape device. .