JPH06325333A - Magnetic recording and reproducing device for monitoring - Google Patents

Abstract

PURPOSE:To extend the lifetime of a cleaning member and to reduce a time in which recording is not yet performed by detecting the presence or absence of the clogging of a rotary head in rewinding operation and cleaning a rotary head when clogging occurs only. CONSTITUTION:A detecting means 4 checks video recording during rewinding operation and outputs the detected result to a command generation section 1 by a detecting result output means 5. When a reproduced signal is not generated by an output signal of the means 5, it is discriminated that clogging occurs in a rotary head 8. And after a magnetic tape 9 is rewound, the generation section 1 outputs a rotary head cleaning command (d) to an operation control section 2. Loading operation in which the tape 9 is wound on a rotary cylinder by this command (d) and unloading operation are performed, a cylindrical member is contacted with a rotary head and magnetic power and the like attached to the rotary head are cleaned. Thus, the lifetime of the cleaning member is extended and a time in which video recording is not yet performed is reduced by cleaning the rotary head when clogging occurs only.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a monitoring magnetic recording / reproducing apparatus used for recording / reproducing an image captured by a surveillance camera.

[0002]

2. Description of the Related Art A monitoring magnetic recording / reproducing apparatus called a time-lapse video tape recorder is capable of recording for a long time because a magnetic tape is intermittently run (or at a low speed) to record video signals at predetermined time intervals. However, along with this, since the rotary head for recording and reproducing video signals scans the same part of the magnetic tape many times, clogging of the rotary head is likely to occur, and to prevent clogging of the rotary head, periodical Need to clean the rotating head.

Therefore, a conventional monitoring magnetic recording / reproducing apparatus will be described. FIG. 3 shows a rotary head cleaning mechanism of a conventional monitoring magnetic recording / reproducing apparatus. The cleaning operation is performed in conjunction with a loading operation and an unloading operation of winding a magnetic tape around the rotary cylinder 10 at the start of recording and at the end of recording. Done. During the loading operation and the unloading operation, the loading gear 13
And rotating the cleaning arm 12 via the cleaning rod 14 to rotate the cylindrical member 11
Contacting the rotary head mounted on the rotary cylinder 10 to clean the magnetic powder and the like adhering to the rotary head.

[0004]

However, in the conventional monitoring magnetic recording / reproducing apparatus, the rotary head is automatically cleaned at the start and end of recording. Therefore, cleaning is performed even if the rotary head is not clogged. As a result, the life of the cleaning member is shortened, and it is necessary to unload and load the magnetic tape for the cleaning operation. Therefore, the unrecorded time is increased by the cleaning time in continuous repeated recording. I had a problem.

An object of the present invention is to solve the above-mentioned problems. By carrying out cleaning only when clogging occurs, the life of the cleaning member is extended and the unrecorded time in continuous repetitive recording is increased. It is an object of the present invention to provide a reduced magnetic recording / reproducing device for monitoring.

[0006]

Means for Solving the Problems Rewinding means for performing a reproducing operation while rewinding a magnetic tape wound around a cylinder, detecting means for detecting the presence or absence of a reproduction signal during the rewinding operation, and the detection result. Therefore, a mechanism for cleaning the rotary head is provided.

[0007]

According to the present invention, by the above-described structure, it is automatically confirmed whether or not the recording is normally performed during the rewinding operation, and if the rotary head is clogged, the rotary head is cleaned. To do.

[0008]

1 is a block diagram showing the structure of a monitoring magnetic recording / reproducing apparatus according to an embodiment of the present invention, FIG. 2 is a timing chart showing the operation of the monitoring magnetic recording / reproducing apparatus, and FIG.
FIG. 6 is a configuration diagram of a rotary head cleaning mechanism which is a common part with a conventional one.

In FIG. 1, 1 is a command generating section, 2 is an operation control section, 3 is recording / reproducing executing means, 4 is detecting means connected to the recording / reproducing executing means 3, and 5 is detection connected to the detecting means 4. Result output means, 6 is a video input terminal, and 7 is a video output terminal. Reference numeral 8 denotes a rotary head for recording and reproducing a video signal on the magnetic tape 9, which is connected to the recording / reproducing execution means 3.

The detection means 4 detects the presence / absence of a reproduction signal during execution of the reproduction operation output by the recording / reproduction executing means 3. The detection result output means 5 outputs the presence / absence of the reproduction signal detected by the detection means 4 to the command generator 1.

The command generator 1 outputs a signal that there is no reproduction signal.
When the input is input to the command generator 1, the command generator 1 outputs a rotary head cleaning command d for performing the unloading and loading operations to the operation controller 2. In addition, a is a rewinding command, b is a recording check command, c is the presence or absence of a reproduction signal of the tape during the rewinding operation, d is a rotary head cleaning command, and e is a recording command.

The operation of the monitoring magnetic recording / reproducing apparatus having the above structure will be described with reference to FIGS.

FIG. 2 is a timing chart showing the operation of the monitoring magnetic recording / reproducing apparatus according to one embodiment of the present invention, and FIG. 3 is a block diagram of the rotary head cleaning mechanism.

In the monitoring magnetic recording / reproducing apparatus, when recording is continuously performed, after recording to the end of the winding of the magnetic tape, the rewinding command a is automatically generated and the rewinding operation is started. .

During this rewinding operation, a recording check command b
Thereby instructing the recording / reproducing executing means 3 to reproduce the magnetic tape 9, and the detecting means 4 detects whether or not a reproducing signal is generated, and outputs the detected result.
The detection result is output to the command generator 1. When the reproduction signal is not generated based on the output signal of the detection result output means 5, it is considered that the rotary head 8 is clogged, and after the magnetic tape is rewound to the winding start, the command generation unit 1 The rotary head cleaning command d is output to the operation control unit 2.

Then, based on the rotary head cleaning command d, the loading gear 13 for performing the loading operation and the unloading operation for winding the magnetic tape 9 around the rotary cylinder 10 shown in FIG. 3 is rotated, and the cleaning rod 14 is interlocked with it. By operating the cleaning arm 12 via the, the cylindrical member 11 contacts the rotary head mounted on the rotary cylinder 10 to clean the magnetic powder and the like attached to the rotary head. Then, foreign matter such as magnetic powder adhering to the surface of the rotary head is removed.

As described above, according to the present embodiment, after the recording is performed up to the end of the winding of the magnetic tape, the presence or absence of clogging is detected during the rewinding operation, and when clogging occurs. By cleaning the rotary head only, the life of the cleaning member can be extended, and the increase in unrecorded time due to the cleaning operation can be suppressed.

The cleaning of the rotary head may be carried out in combination with other cases such as when the tape is taken in and out, when the power is turned on and off, and when the tape is used for a certain period.

[0019]

According to the monitoring magnetic recording / reproducing apparatus of the present invention, the rewinding operation is performed while the magnetic tape is wound around the cylinder, and the recording check function is activated during the rewinding operation to clean the rotary head. It is possible to operate the mechanism only when clogging occurs, and it is possible to obtain the excellent effects of keeping the life of the cleaning member long and reducing the unrecorded time in continuous repeated recording.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of a monitoring magnetic recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a timing chart showing the operation of the monitoring magnetic recording / reproducing apparatus according to the embodiment of the present invention.

FIG. 3 is a configuration diagram showing a rotary head cleaning mechanism of an embodiment of the present invention and a conventional monitoring magnetic recording / reproducing apparatus.

[Explanation of symbols]

 1 command generation part 2 operation control part 3 recording / reproducing execution means 4 detection means 5 detection result output means 6 video input terminal 7 video output terminal 8 rotary head 9 magnetic tape 10 rotary cylinder 11 cylindrical member 12 cleaning arm 13 loading gear 14 cleaning rod

Claims (2)

[Claims] 1. A rotary cylinder having a rotary head for recording a signal on a magnetic tape, a cleaning member for cleaning the rotary head, and a rewinding state in which the magnetic tape is wound around the rotary cylinder,
A rewinding means for performing a regenerating operation, and a detecting means for detecting the presence / absence of a reproduction signal during the rewinding operation, and the cleaning member cleans the rotary head according to the detection result of the detecting means. Magnetic recording / reproducing device for monitoring. 2. A cleaning member having tape loading means for winding a magnetic tape around a rotary cylinder,
The monitoring magnetic recording / reproducing apparatus according to claim 1, wherein cleaning is performed by contacting a rotary head in association with the operation of the tape loading unit.