JPS6346892Y2 - - 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 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 head. 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 in a part of the tape by reciprocating the tape within a certain range in the longitudinal direction while the tape is rotated 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 video head drum or the video head at all.

However, in the above-mentioned prior application, the tape was moved back and forth using the VTR's rewind and playback functions, which caused some problems with operability, such as the need to press the playback button intermittently. It was hot.

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. Furthermore, it is an object of the present invention to provide a cleaning cassette in which the tape path within the cassette is simple and guide pins and the like within the cassette can be largely omitted.

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 hub 3a of the take-up reel 3 with its one end 5a locked through a coil spring 51. At this time, an annular spring storage portion 52 is provided inside the hub 3a, and a spring 51 is provided inside the hub 3a.
is stored in the spring storage portion 52. One end of the spring 51 is locked to a fixing pin 53 provided in the spring storage portion 52, and one end of the tape 5 is drawn into the spring storage portion 52 through a slit 54 provided in the hub 3a. It is locked to the free end of the cylinder via a locking means 55.

By the way, when the coil spring 51 is housed inside the hub 3a in this way, the coil spring 51 does not get in the way at all when wrapping the tape 5 around the circumferential surface of the hub 3a, and The tape 5 is not damaged at all, and the tape 5 can be wrapped neatly.

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.

Further, eccentric rotating parts 11 are provided on the upper and lower outer peripheries of the hub 4a of the supply reel 4.

At this time, this eccentric rotating portion 11 has a bulging portion 12 that is integrally provided on the circumferential surface of the hub 4a and has a circumferential surface having a radius larger than the radius of the hub 4a by a predetermined amount over approximately half the circumference of the circumferential surface of the hub 4a. As a result, the circumferential surface of the hub 4a is configured to have a deformed structure. As shown in FIG. 2, the tape 5 is wound around the circumferential surface of the hub 4a of the supply reel 4 via the eccentric rotating section 11 in a substantially U-shape. Note that reference numerals 16 and 17 each represent a pair of guide pins provided inside the front opening 18 of the cassette housing 2.

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 Al ₂ O ₃ ,
A variety of materials are available using various processing methods that are ideal for wiping dirt off the surface of the fixed head, such as pasting various types of abrasive paper, 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 rotating 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 3.

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,
Tension regulator pin 24 etc. is tape 5
inserted inside. After this cassette is installed, the loading guide 23 and the pinch roller 23
is rotated counterclockwise along the outer periphery of the video head drum 25 by rotation of a loading ring (not shown), and the tension regulator pin 2 is rotated counterclockwise along the outer periphery of the video head drum 25.
4 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.
When the loading guide 22 and the pinch roller 23 reach the solid line position, the loading of the tape 5 is completed, and these are stopped, and
The tape 5 is wound at a predetermined angle around the circumferential surface of a video head drum 25, which is a predetermined running path, and is also attached to fixed heads such as an audio head 26, a control head 27, an erasing head 28, and a 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 is pulled out to a position facing the audio head 26, control head 27, and erasing head 28, respectively, and the tape section 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 stopped at an intermediate position between 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 25 and the erasing head 28.

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

When the rewind button (not shown) is pressed after the loading of the tape 5 is completed, the supply reel table 32
This rotates the supply reel 4 counterclockwise.
The eccentric rotational movement of the eccentric rotating portion 11 and the coil spring 51 cooperate to cause the tape 5 to reciprocate continuously 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 of the coil spring 51. The cleaning units 19 and 20 are pulled in the direction of the arrow, respectively, 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, as shown by the imaginary lines. 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 coil spring 51, and each cleaning section 19 and 20 is moved to the initial 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 fixed to the cassette housing 2 by winding it through the eccentric rotating part 11 of the take-up reel 3, and the other end 5b of the tape 5 is fixed to the coil spring 5.
1, the fixed head can be cleaned in the same way 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.

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.

Further, the spring means referred to in the present invention is not limited to the coil spring 8 shown in the embodiment, but can be changed to a leaf spring, a linear spring, rubber, or other means having various spring effects.

As mentioned above, the present invention is equipped with a tape reciprocating mechanism inside the cassette itself, and after the cassette is inserted into a recording/playback device such as a VTR, the tape can be automatically moved by simply pressing the rewind button or fast forward button. The tape is reciprocally moved so that the cleaning part provided on the tape does not come into contact with the video head or the video head drum at all, but only with the fixed head, thereby making it possible to reliably clean only the fixed head. It is very easy to operate.

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 via a spring means, and the other end of the tape is fixed to one reel in the cassette. The other reel in the cassette or another reel rotated by the other reel is provided with an eccentric rotating part, and the tape is passed through the eccentric rotating part to the other reel or the other reel. wrap around,
By rotationally driving the other reel, the tape is reciprocated within a certain range in the longitudinal direction by the eccentric rotation movement of the eccentric rotation part and the spring means. This tape reciprocating mechanism is simple and has the advantage of being able to reciprocate the tape effortlessly and smoothly.

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. Assembling the cassette, such as installing tape, becomes very easy. Furthermore, tape guide means such as guide pins in the cassette can be largely omitted, and the number of parts and assembly man-hours can be greatly reduced, resulting in a low-cost product. be.

[Brief explanation of drawings]

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, Figure 3 is a sectional view taken along the line shown in Figure 2, and Figure 4 is a partially cutaway plan view of the cleaning cassette. The figure is a sectional view taken along the line of FIG. 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 part, 12... Bulbed part on the circumferential surface of the hub, 19, 2
0...Cleaning section, 21...VTR main body, 3
1... Take-up reel stand, 32... Supply reel stand, 5
1... Coil spring (spring means), 5
2...Spring storage portion, 54...Slit.

Claims (1)

[Scope of utility model registration request] A tape having fixed head cleaning sections provided before and after a rotating head drum is stored,
In a cleaning cassette, the tape is reciprocated within a certain range in the longitudinal direction while the tape is loaded on a predetermined running path outside the cassette including the rotating head drum and the fixed head. During loading, one end of the tape is fixed to one reel that feeds the tape from inside the cassette via a spring means, and the other end of the tape is fixed to the cassette, and the other end of the tape is fixed to the other reel in the cassette or this reel. Another reel that is rotated by the other reel is provided with an eccentric rotating part, and the eccentric rotating part has a circumferential surface having a radius larger than the radius of the hub circumferential surface by a predetermined amount over approximately half the circumference of the hub circumferential surface. The tape is wound on the other reel or the other reel via the eccentric rotating part, and the spring means allows the tape to be wound in any rotational state of the eccentric rotating part. While ensuring that the tape does not become slack, the other reel is rotated on the reel stand of the recording/reproducing device equipped with the rotary head drum and the fixed head via the reel stand fitting part provided on the other reel. By driving
The tape is reciprocated within a certain range in the longitudinal direction by the eccentric rotation movement of the eccentric rotation part and the spring means, and the fixed head is cleaned in a state where the cleaning part is not in contact with the rotary head drum. A cleaning cassette characterized in that it is configured as follows.