JPH0355125Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a cleaning video cassette for cleaning the rotating head drum of a video device, and in particular, the cleaning tape can be pulled out reliably from the cassette body. This is how it was done.

(Prior Art and its Problems) A conventional cleaning video cassette has the same structure as a magnetic tape video cassette, except that a cleaning tape is used instead of the magnetic tape. Then, when the cleaning video cassette is set in the video device, the cleaning tape is pulled out by the pair of loading poles and wound around the rotating head drum in a Ω shape. When the play button is pressed from this state, the cleaning tape is The rotating head drum and other parts are cleaned.

By the way, in video apparatuses, in order to reduce power consumption, the motor output is reduced to the minimum necessary level without interfering with the running of the magnetic tape. Therefore, when trying to run the cleaning tape, the cleaning tape is made of cloth and has greater frictional resistance than magnetic tape, and is particularly subject to greater running resistance from the rotating head drum, which causes the video equipment's motor to overload. Load is applied,
Depending on the model, the safety device may activate and the motor may stop.

Therefore, a tapered roller is provided inside the cassette body of a cleaning video cassette so that the cleaning tape contacts the rotating head drum via the tapered roller, thereby reducing the contact area of the cleaning tape with the rotating head drum, and It has been proposed to incline the tape so as to correspond to the inclination of the rotating head drum so that the tape comes into even surface contact with the rotating head drum (Japanese Utility Model Publication No. 132518/1983).

(Problems to be Solved by the Invention) According to the above-mentioned conventional configuration, since the cleaning tape is twisted by the tapered roller, when the cleaning video cassette is set in the video device, the cleaning tape and the loading pole are twisted. There was a risk that the cleaning tape could not be pulled out from the cassette main body because the cleaning tape was not engaged in the prescribed manner.

SUMMARY OF THE INVENTION In view of the above-mentioned conventional problems, it is an object of the present invention to provide a cleaning video cassette that can ensure that the cleaning tape and the loading pole are engaged in a predetermined manner.

(Means for Solving the Problems) In order to solve the above problems, the present invention provides an opening 2 through which the tape surface of the cleaning tape 4 or the tape winding layer 4a around which the tape 4 is wound is exposed. 3 is formed on the front opening/closing lid 1b of the cassette body 1a or on the top plate, and the openings 2 and 3 are used as windows for injecting liquid. The middle of the cleaning tape 4 passes through a taper roller 14 provided inside the cassette body 1a, and the cleaning tape 4 is placed inside the cassette body 1a adjacent to the taper roller 14 and closer to the center of the cassette body than the taper roller 14.
A configuration is adopted in which twist correction rollers 35 and 36 are provided.

(Function) According to the above structure, when the cleaning video cassette 1 is set in the video device, the twisting caused in the cleaning tape 4 due to the cleaning tape 4 passing through the tapered roller 14 is corrected by the correction rollers 35 and 36. Since the cleaning tape 4 is corrected, the cleaning tape 4 and the loading poles 7a, 7b, 8a, 8b engage with each other in a predetermined manner, and the cleaning tape 4 can be reliably pulled out from the cassette main body 1a.

(Embodiment) This embodiment relates to a cleaning video cassette for a VHS parallel loading type video device.

FIG. 3 is a perspective view of the cleaning video cassette 1, in which the cassette body 1a is made of synthetic resin.
and a front opening/closing lid 1b covering the front surface of the cassette body 1a, and liquid injection windows 2, 3 are formed in the top plate portion of the cassette body 1a and the front opening/closing lid 1b. Note that at least one liquid agent injection window 2, 3 is sufficient.

FIG. 1 is a perspective view of the cassette main body 1a viewed from the bottom side. Guide rollers 5 and 6 for guiding the cleaning tape 4 are provided at both ends of the front surface of the cassette main body 1a, and guide rollers 5 and 6 are provided at both ends of the front surface of the cassette main body 1a. Two sets of loading poles 7a, 7b, 8 at the ends
a, 8b (see FIGS. 5 and 6) are respectively formed into recesses 9 and 10, and a cutout step 11 is formed at the corner between the front surface of the cassette body 1a and the central recess 9. A tape guide member 12 is disposed within the notched stepped portion 11. As shown in FIG. 2, this tape guide member 12 is composed of a guide plate 13 fixed to the bottom surface of the stepped notch, and a tapered roller 14 whose both ends are rotatably supported by the guide plate 13. A portion of the cleaning tape 4 stretched over the front surface of the cassette body 1a passes under the tapered roller 14. The taper angle of the tapered roller 14 corresponds to the inclination angle of the rotating head drum 20 (see FIGS. 5 and 6). Therefore, when the cleaning tape 4 is loaded, the cleaning tape 4 tilted by the tapered roller 14 is brought into uniform surface contact with a predetermined position of the rotary head drum 20. To describe an example of specific dimensions of the tapered roller 14, as shown in the cross-sectional view of the main part in FIG. 2, the length L is 14 mm, the small diameter side diameter _R1 is 3 mm,
The diameter _R2 on the large diameter side is 4 mm.

Further, in the cassette body 1a, a straight roller 35 (correction roller) for twist correction is provided adjacent to the taper roller 14 and closer to the center of the cassette body than the taper roller 14. When the cleaning tape 4 passes over the straight roller 35, the twist caused in the cleaning tape 4 is corrected by the straight roller 35.

FIG. 5 is a horizontal sectional view showing a state in which the cleaning tape 4 is being loaded, and FIG. 6 is a horizontal sectional view showing a state in which the cleaning tape 4 is being loaded. In both figures, a feed reel 15 and a take-up reel 16 are rotatably housed in the cassette body 1a. A cleaning tape 4 is wrapped around it. Further, the top plate of the feeding reel 15 has an arc-shaped opening 17 along the circumferential direction.
are opened, and the tape wound layer 4a is exposed in these openings 17. 18 is a pressure piece for preventing winding disorder.

Note that the video device includes a rotating head drum 2.
0, a supply side impedance roller 21, a full-width erasing head 22, a take-up side impedance roller 23, a voice erasing head 24, an audio control head 25, a pinch roller 26, etc. are provided.

FIG. 4 is a cross-sectional view showing a state in which the tip of the cleaner liquid pouring container 27 is inserted into the opening 17 from the liquid injection window 2 to impregnate the tape wound layer 4a with the liquid. As the cleaning agent, a liquid having a high cleaning effect, for example, a liquid commonly known as a cleaner liquid such as fluorocarbon liquid or alcohol is used. 28 is a leaf spring for pressing the reel.

As shown in FIG. 4, the cleaning procedure is to first impregnate the tape winding layer 4a with a liquid agent, and also apply the liquid agent to the unwinding end of the cleaning tape 4 through the liquid injection window 3 of the front lid 1b. After impregnation, the cleaning video cassette 1 is set in a video device. As a result, the cleaning video cassette 1 is drawn into the video apparatus, and as shown in FIG.
b, 8a, and 8b. At this time, the tapered roller 1 of the cleaning tape 4
Since the twist caused by 4 has been corrected by the straight roller 35, the cleaning tape 4
can be inserted between one set of loading poles 7a, 7b at a predetermined distance, and the cleaning tape 4 can be engaged with the other set of loading poles 8a, 8b in a normal loading state. be able to.

Subsequently, each group's loading pole 7a,
7b, 8a, and 8b are moved, and the cleaning tape 4 is pulled out from the cassette body 1a and wound around the rotating head drum 20, as shown in FIG. At this time, since the cleaning tape 4 passes through the tapered roller 14, it only contacts the rotary head drum 20 in an arc shape, but not in an Ω shape, and the length of the contact is in an Ω shape. It has decreased significantly compared to . Therefore, there is no risk of overloading the motor of the video device.

Further, the cleaning tape 4 is tilted appropriately by a tapered roller 14, and is brought into uniform surface contact with a predetermined position of the rotating head drum 20.
Therefore, when the playback button is pressed to rotate the take-up reel 16 and run the cleaning tape 4, the cleaning tape 4 will run even though the contact area between the cleaning tape 4 and the rotating head drum 20 is reduced. 4, the rotary head drum 20 and the like are reliably cleaned.

In the above embodiment, a video device of the type in which the cleaning tape 4 is inserted between one set of loading poles 7a and 7b has been described as an example, but as shown in FIG. The present invention can be similarly applied to a type of video device that is not inserted between the viewing poles 7a and 7b.

In addition, as shown in FIG. 8, the straight roller 3
5, a tapered guide roller 36 (correction roller) having the same shape as the tapered roller 14 and having a tapered direction opposite to that of the tapered roller 14 may be used.

According to this configuration, the twist of the cleaning tape 4 caused by the tapered roller 14 can be corrected more reliably.

(Effect of the invention) According to the invention, since the twist of the cleaning tape caused by the taper roller is corrected by the correction roller, the cleaning tape and the loading pole are engaged in a predetermined manner, and the cassette body is You can reliably pull out the cleaning tape from the

[Brief explanation of drawings]

Fig. 1 is a perspective view of the cassette body of a cleaning video cassette, which is an embodiment of the present invention, seen from the bottom side, and Fig. 2 is a cross-sectional view of the main part (the cross-sectional line is taken along the - line in Fig. 1). ), Figure 3 is an overall perspective view of the same video cassette, Figure 4 is a cross-sectional view of the same (the cross-sectional line is along the - line in Figure 3), Figure 5 is a horizontal cross-sectional view of the video cassette in the middle of loading, 6 is a horizontal cross-sectional view of the same loading state, FIG. 7 is a horizontal plan view showing a modification of the same, and FIG. 8 is a perspective view of essential parts showing another embodiment of the present invention. 1...Video cassette for cleaning, 1a...
...Cassette body, 1b...Front opening/closing lid, 2, 3...
...Liquid injection window, 4...Cleaning tape, 4
a...Tape winding layer, 7a, 7b, 8a, 8b...
...Loading pole, 14...Taper roller,
17...Opening, 35...Straight roller (correction roller), 36...Guide roller (correction roller).

Claims (1)

[Scope of utility model registration request] A cleaning method in which an opening through which the tape surface of the cleaning tape or the tape winding layer around which the tape is wound is exposed is formed in the front opening/closing lid of the cassette body or in the top plate, and the opening serves as a window for injecting liquid. In a video cassette, the cleaning tape that is wound and stretched along the front opening/closing lid passes through a tapered roller provided inside the cassette body, and a tape is placed inside the cassette body.
A cleaning video cassette comprising a cleaning tape twist correcting roller provided adjacent to a taper roller and closer to the center of the cassette body than the taper roller.