JPS6346891Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a cleaning cassette that is most suitable for wiping dirt off a fixed head of a VTR, for example.

Conventionally, as a cleaning cassette for a VTR, one in which a cleaning section is 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 upper and lower ends of the case can be brought into contact only with fixed heads such as audio heads and control heads, without contacting the video heads. It has been taken into consideration. (Note that if the cleaning section comes into contact with the video head, the video head will be easily damaged by the abrasive material contained in the cleaning section.) However, after cleaning with the conventional cassette mentioned above, It has been found that when a normal magnetic tape is loaded (running), the playback output of the video head deteriorates. This is because the cleaning section may come into contact with the surface of the video head drum and roughen the surface, causing a change in the running condition of the magnetic tape, or the cleaning section may come into contact with a part of the video head unexpectedly and cause the surface to become rough. This is thought to be due to changes in the surface condition.

By the way, the applicant of the present invention has developed a cleaning section provided on a part of the tape by reciprocating the tape within a certain range in the longitudinal direction with the tape loaded on a predetermined running path outside the cassette. An application has already been filed for a cleaning cassette that is able to reliably clean only the fixed head by contacting only the fixed head without contacting the head drum or video head at all.

However, in the above-mentioned prior application, the tape was moved back and forth using the VTR's rewinding and replaying functions, which resulted in some operational problems, such as the need to press the play button intermittently. There was a problem.

The present invention was devised in view of the above-mentioned circumstances, and includes a mechanism for reciprocating the tape inside the cassette itself, so that after the cassette is installed in a recording/playback device such as a VCR, the rewind button or fast forward button can be pressed. The tape can be automatically reciprocated by simply pressing , etc., and as in the previous application, the cleaning unit does not come into contact with the video head drum or video head at all, but only with the fixed head. This cleaning cassette is designed to reliably clean only the fixed head, and in particular, the tape reciprocating mechanism provided in the cassette is simple and allows the tape to reciprocate effortlessly and smoothly. It is an object of the present invention to provide a cleaning cassette that is easy to clean and that allows easy tape passing within the cassette.

An embodiment in which the present invention is applied to a cleaning cassette for a VTR will be described below with reference to the drawings.

First, in FIGS. 1 to 4, a pair of reels, a take-up reel 3 and a supply reel 4, are rotatably housed in a cassette housing 2 of a cleaning cassette 1. Inside the cassette housing 2, a tape 5 made of magnetic tape or other flexible films made of various materials is housed. The tape 5 is wound around the circumferential surface of the hub 3a of the take-up reel 3 via a locking means 6 at one end 5a. The other end 5b of the tape 5 is locked to a fixing pin 7 provided in the cassette housing 2 via a locking means 8.

Furthermore, an eccentric rotating portion 1 is provided between a pair of flanges 4b arranged on the upper and lower outer peripheries of the hub 4a of the supply reel 4.
1 is provided. Note that this eccentric rotating part 11 has a vertical pin 12 fixed between both flanges 4b.
and a rotatable roller 13 inserted on its outer periphery.
It is composed of: As shown in FIG. 2, the tape 5 is wound around the circumferential surface of the hub 4a of the supply reel 4 in a substantially U-shape via the eccentric rotating section 11. Note that reference numerals 16 and 17 indicate a pair of guide pins provided on both sides of the front opening 18 of the cassette housing 1.

Further, a tension arm 41 is provided at one corner of the cassette housing 2 on the take-up reel 3 side. This tension arm 41 is configured to be rotatable about a fulcrum 42, and is urged to rotate counterclockwise by a linear spring 43 or the like. A roller 44 rotatably provided at the tip of the tension arm 41 is engaged with the tape 5, and the tape 5 is pulled and energized toward the take-up reel 3 by the tension arm 44.

A pair of cleaning sections 19 and 20 for cleaning the fixed head of the VTR are provided at two locations on the tape 5, respectively, over the entire width of the tape 5 and over a predetermined length. Note that these cleaning parts 19 and 20 are attached to the 5th side of the tape.
Applying various abrasive materials such as Cr ₂ O ₃ and AlO ₃ ,
We use various materials and processing methods that are ideal for wiping dirt off the surface of the fixed head, such as pasting various abrasive papers or roughening only that part by mechanical processing such as sandblasting. It is formed. Further, these cleaning parts 19 and 20 can be laminated onto the tape 5, or the tape 5 can be cut in the middle and joined together with an adhesive tape or the like.

Next, using the cleaning cassette 1 described above,
The cleaning operation of the fixed head of a VTR will be explained. The VTR shown here is a U-type loading type VTR.

First, as shown in FIG. 1, before the cassette is mounted on a VTR, the tape 5 in the cleaning cassette 1 is wound onto the take-up reel 5.

Next, as shown in Fig. 2, clean the cleaning cassette 1.
When mounted on the VTR main body 21, loading guide 22, pinch roller 23,
A tension regulator pin 24 and the like are inserted inside the tape 5. After the cassette is installed, the loading guide 22 and the pinch roller 23 are rotated counterclockwise along the outer periphery of the video head drum 25 by the rotation of the loading ring (not shown), and the tension regulator pin 24
is also moved to the solid line position. As a result of these movements, the tape 5 is gradually drawn out of the cleaning cassette 1 from the take-up reel 3 and is loaded onto the circumferential surface of the video head drum 25. And loading guide 22 and pinch roller 2
When the tape 3 reaches the solid line position, the loading of the tape 5 is completed and is stopped, and the tape 5 is wound at a predetermined angle around the circumferential surface of the video head drum 25, which is a predetermined running path, and is then placed on a fixed head. audio head 26, control head 27, erase head 28 and capstan 2.
9. The tape passes through several other tape guides as shown by the solid line. When the loading of this tape 5 is completed, both cleaning sections 19 and 20 are shown as solid lines.
The tape section 14 is pulled out to a position facing the audio head 26, control head 27, and erasing head 28, respectively, and the tape section 14 is pulled out to a position on the circumferential surface of the video head drum 25. However, at this time, one cleaning section 19 is connected to the audio head 26.
and the capstan 29, and the other cleaning section 20 is stopped at an intermediate position between the video head drum 29 and the video head drum 29.
5 and the erase head 28.

By the way, by attaching the cleaning cassette 1 to the VTR main body 21 described above, the pair of reel stands 31 and 32 provided on the VTR main body 21 are engaged with both reels 3 and 4, respectively.

Then, when the rewind button (not shown) is pressed after loading of the tape 5 is completed, the supply reel stand 32
The supply reel 4 is rotated counterclockwise by
Due to the eccentric rotation movement of the eccentric rotation part 11 and the cooperative action of the tension arm 41, the tape 5 is continuously reciprocated within a certain range in its longitudinal direction.

That is, when the radius of the supply reel 4 is A, the eccentric rotating part 11 rotates eccentrically with an eccentric amount of A+α, and during one rotation of the supply reel 4, the eccentric rotating part 11 rotates eccentrically.
When first rotates counterclockwise from the solid line position and moves to the imaginary line position, the tape 5 is hooked by the eccentric rotating portion 11, and the tape 5 resists the tensile force by the tension arm 41. is pulled in the direction of the arrow, and the cleaning sections 19 and 20 are moved to an intermediate position between the control head 27 and the video head drum 25 and an intermediate position between the erasing head 28 and the tension regulator pin 24, respectively, as shown by the imaginary lines. Each will be moved. Then, when the eccentric rotating part 11 moves from the virtual line position to the solid line position,
The tape 5 is pulled back in the opposite direction of the arrow by the tensile force of the tension arm 41, and each cleaning section 19 and 20 is moved to the original position indicated by the solid line.

Therefore, during one rotation of the supply reel 4, both the cleaning parts 19 and 20 are reciprocated once between the solid line position and the imaginary line position, and the continuous rotation of the supply reel 4 causes the above reciprocating movement. Continuous.

One of the cleaning sections 19 comes into sliding contact with the audio head 26 and the control head 27 to clean them by wiping them clean, and the other cleaning section 20 comes into sliding contact with the erasing head 28 and wipes away the dirt. You will need to clean it accordingly.

However, in this case, these cleaning parts 19,
Since the cleaning parts 20 do not come into contact with the video head drum 25 at all, there is no risk that the video head 33 attached to the video head drum 25 will be damaged by these cleaning parts 19 and 20.

After the above-mentioned cleaning, if the stop button is pressed and then the eject button (none of which is shown) is pressed, the tape 5 is wound onto the take-up reel 3 of the cleaning cassette 1, and then the cleaning cassette 1 is removed. is ejected.

By the way, a VTR with an auto-rewind mechanism
In this case, for example, as shown in FIG. 2, a sensing tape 35 is attached to the other end 5b of the tape 5, and when the tape 5 is loaded after the cassette is installed as described above, the sensing tape 35 is attached to the other end 5b of the tape 5. If the cleaning cassette 1 is configured to be detected by a sensor such as the proximity switch 36 and switched to auto rewind mode (automatic rewinding state) to automatically rotate the supply reel 4, the cleaning cassette 1 can be simply moved.
By simply attaching it to the VTR main body 21, the fixed head described above can be cleaned without pressing the rewind button.

Further, an eccentric rotating part 11 is provided on the take-up reel 3 side,
One end 5a of the tape 5 is wound through the eccentric rotating part 11 of the take-up reel 3 and fixed to the cassette housing 2, and the other end 5b of the tape 5 is locked to the supply reel 4 side, and the tape is If the tension arm 41 is provided on the other end 5b of the 5, the fixed head can be cleaned in the same manner as described above by pressing the fast forward button and rotating the take-up reel 3. become.

Another reel is rotatably provided in the cassette housing 2, and this reel is provided with an eccentric rotating section 11, and the tape 5 is wound around this reel in the same manner as described above. Even if the drive structure is configured to rotate this reel, the fixed head can be cleaned in the same manner as described above.

In the above embodiment, the tension arm 41 is placed outside the tape path of the tape 5, but even if the tension arm 41 is placed inside the tape path as shown in FIG. It is possible to apply tension to the take-up reel 3 side.

Although the embodiments of the present invention have been described above, various modifications can be made based on the technical idea of the present invention.

First, according to the present invention, the M-type loading method
It is applicable not only to VTRs but also to various recording and reproducing devices other than VTRs.

Furthermore, the cleaning section referred to in the present invention is by no means limited to that shown in the embodiments, and the cleaning section may be provided at least at one location on the tape 5.

Furthermore, the tension arm referred to in the present invention is by no means limited to the one shown in the embodiments, and can be modified into various structures.

As mentioned above, the present invention is equipped with a tape reciprocating mechanism inside the cassette itself, and after the cassette is attached to a recording/reproducing device such as a VTR and the tape inside the cassette is loaded onto a predetermined tape running path outside the cassette. For example, simply by pressing the rewind button or fast forward button, the tape is automatically moved back and forth, and the cleaning section provided on the tape does not come into contact with the video head or video head drum at all.
It is designed so that it can be brought into contact with only the fixed head, and that only the fixed head can be reliably cleaned for an arbitrary period of time depending on the degree of dirt, etc., and its operation is very simple. be.

Moreover, according to the present invention, the tape reciprocating mechanism provided in the cassette is configured such that one end of the tape is locked to one reel in the cassette and the other end of the tape is fixed to the cassette. The other reel or another reel rotated by the other reel is provided with an eccentric rotating section, the tape is wound around the other reel or the other reel via the eccentric rotating section, and the tape is wound inside the cassette. By engaging the tension arm provided on the tape with the tape, the tension arm pulls and urges the tape toward the one reel, and the other reel is driven to rotate, thereby causing the eccentric rotating section to rotate. Since the mechanism is configured to reciprocate the tape within a certain range in the longitudinal direction using eccentric rotational motion and the tension arm, the mechanism for reciprocating the tape is simple and does not force the tape to move. It has the advantage of being able to reciprocate smoothly without any problems.

Furthermore, it is no longer necessary to make a complicated tape path, such as detouring the tape from one reel to the other in an almost U-shape, and the tape path within the cassette becomes very simple. This has the advantage that the assembly of the cassette, such as the installation of the tape, becomes very easy.

[Brief explanation of the drawing]

The drawing shows an embodiment in which the present invention is applied to a cleaning cassette for a VCR, and the first embodiment is shown in the drawing.
The figure is a partially cutaway plan view of the cleaning cassette, Figure 2 is a partially cutaway plan view of the cleaning cassette attached to the VTR body and tape is loaded, and Figure 3 is a perspective view of the tension arm.
FIG. 4 is a sectional view taken along the line shown in FIG. 2, and FIG. 5 is a partially cutaway plan view of a main part showing a modified example. In addition, in the symbols used in the drawings, 1... cleaning cassette, 2... cassette housing, 3...
... Take-up reel (one reel), 4 ... Supply reel (other reel), 5 ... Tape, 11 ... Eccentric rotating section, 12 ... Pin, 19, 20 ... Cleaning section, 21 ... VTR Main body, 31...take-up reel stand, 32...supply reel stand, 41...tension arm, 43...spring, 44...roller.

Claims (1)

[Claims for Utility Model Registration] (1) A cleaning section of a fixed head provided on a predetermined tape running path outside the cassette is provided at a predetermined location, and a tape having a length at least slightly longer than that required for loading is stored. In a cleaning cassette which is configured to reciprocate within a certain range in the longitudinal direction with the tape loaded on the running path, one end of the tape is locked to one reel in the cassette, and the tape is loaded on the running path. Providing an eccentric rotating part on the other reel or another reel rotated by the other reel,
The tape, whose one end is locked to one reel, is wound on the other reel or the other reel by passing through the guide pins provided near both ends of the front opening of the cassette and the eccentric rotating part, and The other end of the tape is fixed in a cassette, and a tension arm provided in the cassette is elastically pressed against the tape in the vicinity of the one reel to eliminate tape slack caused by the rotational state of the eccentric rotating section. The tension arm pulls and urges the tape toward the one reel, and after tape loading, the other reel is rotationally driven by the tape running operation of the device provided with the fixed head. A cleaning cassette characterized in that the tape is reciprocated within a certain range in the longitudinal direction by the eccentric rotation movement of the eccentric rotation part and the tension arm. (2) The cleaning cassette according to claim 1, wherein the tape is provided with an end detecting section that detects the end of the tape at any rotational position of the eccentric rotating section.