JPS6131377Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a VTR cleaning tape cassette for wiping dirt off the head of a VTR, and in particular to a tape cassette designed to clean only the fixed head of the VTR.

Conventionally, as a cleaning tape cassette for a VTR, one in which cleaning portions are provided only at both the upper and lower ends of the tape over the entire length of the tape is known. By attaching the cassette to a VTR and running the tape, the cleaning parts at both the top and bottom ends of the tape can be brought into contact only with fixed heads such as audio heads and control heads, without contacting the video heads. This was taken into consideration. (If the cleaning part comes into contact with the video head, the video head will be easily damaged by the abrasive material contained in the cleaning part.) However, after cleaning with the conventional cassette mentioned above, It was discovered that when a normal magnetic tape was loaded (running) on a VTR, the playback output of the video head deteriorated. This is because the cleaning part comes into contact with the surface of the video head drum, roughening the surface and causing a change in the running condition of the magnetic tape, and the cleaning part may accidentally come into contact with a part of the video head. This is thought to be due to changes in the surface condition of the surface.

The present invention was devised in view of the above-mentioned circumstances, and the cleaning tape portion does not come into contact with the video drum or the video head at all, but only with the fixed head, thereby ensuring that only the fixed head is in contact with the cleaning tape. The purpose of the present invention is to provide a VTR cleaning tape cassette that can be cleaned.

A first embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

First, the cassette housing 2 of the VTR cleaning tape cassette (hereinafter simply referred to as cassette) 1
A pair of reels 3 and 4 are rotatably housed inside. Further, a magnetic tape 5 is housed within the cassette housing 2. Further, sensing tapes 6 and 7 are connected to both ends of the magnetic tape 5, respectively. The magnetic tape 5 is fixed to the reels 3 and 4 at the tips of the sensing tapes 6 and 7, respectively, and is fitted therein. The total length of the magnetic tape 5 including both sensing tapes 6 and 7 is
The tape loading length is set to be slightly longer than the tape loading length.

Therefore, at a position separated by a predetermined distance from the connection end of the sensing tape 7 on the take-up reel 4 side with the magnetic tape 5 of both reels 3 and 4, there is a VTR in the middle of the magnetic tape 5 in the longitudinal direction. A cleaning tape portion 8 for cleaning the fixed head is provided over a predetermined length. If necessary, a cleaning tape section similar to the above may be installed at a position a predetermined distance away from the connection end of the sensing tape 6 with the magnetic tape 5 on the supply reel 3 side, and at a midway point in the longitudinal direction of the magnetic tape 5. 9 is provided over a predetermined length. The cleaning tape parts 8 and 9 may be made of polyester film or the like with one side coated with chromium oxide or white arundum (trade name of Dupont), or laminated with nonwoven fabric, leather, etc. , and other materials suitable for wiping and cleaning dirt on the surface of the fixed head. In addition, when these cleaning tape parts 8 and 9 are provided in the middle of the magnetic tape 5, the magnetic tape 5 is cut in the middle and both ends of each of the tape parts 8 and 9 are connected to the magnetic tape 5 with adhesive tape. Alternatively, the tape portions 8 and 9 may be laminated on the magnetic powder coated side of the magnetic tape 5.

Next, the length and arrangement of the cleaning tape portions 8 and 9 will be explained based on an actual head cleaning operation of a VTR using the cassette 1. This example shows the case where it is applied to a U-type rotating VTR.The VTR shown here also automatically loads the tape after the cassette is installed, and also automatically winds the tape. It has a return function.

First, FIG. 1 shows the state at the moment when the cassette 1 is attached to the VTR main body 11 (this is also the state when the cassette is ejected). When the cassette is attached, the magnetic tape 5 is wound onto the take-up reel 4, and most of the sensing tape 6 on the supply reel 3 is pulled out as shown in the figure.

However, after installing the above cassette, the VTR main unit 1
The magnetic tape 5 is automatically pulled out from the inside of the cassette 1 by the tape loading guide 12 of the magnetic tape 1. However, at this time, the magnetic tape 5 is unwound from the take-up reel 4 side and moved counterclockwise along the outer periphery of the video head drum 13 of the VTR main body 11.

Just before the end of the tape loading, one cleaning tape section 8 is pulled out to a position between the capstan 14, audio head 15, and control head 16 of the VTR main body 11, as shown in FIG. Also, the other cleaning tape part 9 is also attached to the VTR 11.
The erase head 17 is pulled out.

And just before the end of the above tape loading
Tension regulator pin 1 of VTR main body 11
8 is moved to the position shown in FIG. 2, and the magnetic tape 5 is also slightly pulled out from the supply reel 3 side. The end 6a of the sensing tape 6 on the side of the supply reel 3
is detected by the proximity switch 19 of the VTR main body 11.

Then, based on the detection, the VTR is automatically switched to the winding mode, and the magnetic tape 5 is automatically rewound to the supply reel 3 side.

By the automatic rewinding of the lever, one of the cleaning tape portions 8 is moved to the tape inlet 21 side with respect to the video head drum 13, and the sensing tape 7 on the take-up reel 4 side is pulled out of the cassette 1. As shown in FIG. 3, when the end 8a of one cleaning tape portion 8 on the tape loading direction side reaches a position immediately in front of the tape inlet 21, the end 7a of the other sensing tape 7 It is detected by the proximity switch 22 of the main body 11. Then, based on this detection, the VTR automatically switches to stop mode and stops the magnetic tape 5.
is automatically stopped at the above position. As described above, immediately before the magnetic tape 5 starts to be automatically rewinded, the end 9a of the other cleaning tape portion 9 in the tape unloading direction is connected to the video head drum 13 as shown in FIG. The magnetic tape 5 reaches a position immediately before the tape exit 22, and is moved to a position away from the tape exit 22 as shown in FIG. 3 by automatic rewinding of the magnetic tape 5.

With the above steps, the loading operation of the magnetic tape 5 is completed.

Next, when the loading of the magnetic tape 5 is completed, press the play button (not shown) on the VTR main body 11.
When you switch the VTR to playback mode, the VTR main unit 11
At the same time that the pinch roller 24 is pressed against the capstan 14, the take-up reel 4 is driven, and the magnetic tape 5 is wound onto the take-up reel 4 side. As a result, one cleaning tape portion 8 moves toward the capstan 14 while wiping dirt off the surfaces of the video head 15 and control head 16.

As shown in FIG. 4, when the end 8b of one cleaning tape portion 8 on the tape unloading direction side reaches a position immediately before contacting the capstan 14, the end 6a of one sensing tape 6 is detected again by the proximity switch 19. Then, based on this detection, the VTR is automatically switched to the rewinding state again, and the magnetic tape 5
will be automatically rewound again. Then, one of the cleaning tape portions 8 is moved to the video head drum 13 side while again wiping off the dirt on the surfaces of the audio head 15 and control head 16, and is automatically stopped at the position shown in FIG. 3 in the same manner as described above. During the above operation, the other cleaning tape portion 9 is also moved back and forth while wiping the dirt on the erasing head 17.

Then, when the play button is pressed again after the above state, the above operation is repeated again.

In short, tape rotation is complete,
By intermittently pressing the play button, the cleaning tape parts 8 and 9 repeat reciprocating movements within a predetermined range, and one cleaning tape part 8 cleans the audio head 15 and control head 16, while the other cleaning tape part 8 cleans the audio head 15 and control head 16. The erase head 17 is cleaned at the tape section. Therefore, there is no possibility that the cleaning tape portions 8, 9 accidentally come into contact with the video head drum 13 and the video head 25 during this cleaning operation and damage these surfaces.
In particular, since one cleaning tape portion 8 is reciprocated between just before the tape inlet 21 and just before the capstan 14, this cleaning tape portion 8 does not come into contact with the capstan 14 during the reciprocation. .

Next, Figure 5 shows the present invention in the M-type loading system.
This shows a second embodiment applied to a VTR, and in this case as well, a cassette 28 similar to the cassette 1 described above is used. Cleaning tape parts 30 and 31 are provided over a predetermined length at predetermined positions on the magnetic tape 29 of a predetermined length. tape part 3
By reciprocating the head 0 and 31 between the solid line and the virtual line in the figure, the audio head/control head 32 and the erasing head 33 can be cleaned by wiping off dirt. Also in this case, the cleaning tape parts 30 and 31
The video head drum 34 and video head 35
The above-mentioned cleaning can be carried out without causing damage to these by accidental contact with them.

Note that the cleaning tape portion referred to in the present invention is not limited to that shown in the embodiments.
Further, the tape provided in the middle of the cleaning tape portion in the longitudinal direction does not necessarily have to be the magnetic tape 5, 29 shown in the embodiment.

As mentioned above, the VTR cleaning tape cassette of the present invention has a cleaning tape part for cleaning the fixed head of the VTR, partially provided over a predetermined length at a predetermined position in the middle of the tape, and at least The cleaning tape section is configured to clean a fixed head such as an audio head placed on the tape inlet side of the video head drum, and when cleaning, the cleaning tape section cleans the video head, audio head, etc. This is to ensure that there is no chance of someone coming into contact with you unexpectedly. Therefore, when using the VTR cleaning tape cassette of the present invention,
There is no danger that the surface of the video head drum or video head will be accidentally damaged by the cleaning tape portion, and safety is extremely high. Further, since the cleaning tape portion only needs to be provided at a very local position and does not need to be provided over the entire length of the tape, it is very advantageous in terms of cost.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and
1 to 4 are partially cutaway schematic plan views illustrating the cleaning operation in the first embodiment, and FIG. 5 is a partially cutaway schematic plan view in the second embodiment. Also, in the symbols used in the drawings, 1...
Cleaning tape cassette for VTR, 2...Cassette housing, 3...Supply reel, 4...Take-up reel, 5...Magnetic tape, 8, 9...Cleaning tape portion, 11...VTR body, 13... ...video head drum, 15...audio head, 1
6...Control head, 17...Erasing head, 21...Tape inlet, 23...Tape outlet,
28...cassette, 29...magnetic tape, 30,
31... Cleaning tape part, 32... Audio head/control head, 33...
...Erasing head, 34...Video head drum, 3
5...Video head.

Claims (1)

[Scope of utility model registration request] A cleaning tape part for cleaning the fixed head located at least on the tape inlet side of the video head drum of the VTR is provided over a predetermined length in the middle of a predetermined length of tape, and both ends of this tape are attached to the cassette. The tape is fixed to a pair of reels provided inside the housing, and the tape is wound and stored on the take-up reel side of the pair of reels, and the tape is taken up when loading the tape with a VTR. The cleaning tape portion is configured to be fed out from the reel side, and is configured such that at the end of the tape loading, the end of the cleaning tape portion on the loading direction side is stopped immediately before the tape entrance. A cleaning tape cassette for a VTR, characterized in that the arrangement of the tape is set with respect to the above-mentioned tape.