JPH03292693A - Method and device for specular surface treatment and dust removal of magnetic tape by ceramic edge - Google Patents

Abstract

PURPOSE:To precisely and efficiently perform the specular surface treatment and dust removal of a magnetic tape by freely controlling the engaging attitude of the front end part of a ceramic edge to press this edge to front and rear faces of the magnetic tape which passes while being stretched. CONSTITUTION:The approximately rectangular front end of a ceramic edge 2 is pressed to front and rear faces of a magnetic tape which is stretched and passes at a high speed, and front and rear faces of the magnetic tape are lapped into specular surfaces and dust or the like stuck to them is wiped away. The edge 2 is stuck to a ceramic edge ball 3, and the ceramic edge ball 3 is freely turnably supported on a turning base 4, and the turning base 4 is freely turnably supported on the fixed side. Thus, the engaging attitude between the edge 2 and the magnetic tape 6 is optimized, and the edge 3 is scarecely worn because being made of ceramics, and specular surface treatment and dust removal functions are semipermanently kept.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is much more effective than the prior art in performing mirror polishing and dust removal on magnetic tapes on various types of equipment that use magnetic tapes during their passage. The present invention relates to a method and apparatus for mirror finishing and dust removal according to claim (1), wherein the ceramic edge has high precision and high processing capacity.

[Prior Art] Conventionally, dust has been removed from the surface of a magnetic tape in video or DAT tape winders, high-speed video printers, or DAT printers.

Figure 6 shows the general structure of a video magnetic tape winder and the magnetic tape cleaning device 1a installed inside it.
This shows that. In addition, FIG. 7 shows the cleaning device 1
Only part a is enlarged.

The magnetic tape 6 fed out from the supply reel 1.0 is wound around the roller 19 of the cushion arm 18 via the dancer arm 15 and length measuring roller 17, passes through the pinhole detector 20, and is transferred from the case stocker 21 to the cassette holder 2.
Take-up reel (distance) in the case that fell into 2
is wound up.

Note that the spare supply reel 11 shown in FIG. 6 is used to switch with the supply reel 10, and the switching is performed by the supply splice section 12. In addition, the magnetic tape 6 that is no longer needed on the supply reel 10 is
It is wound up by the scrap finder 23. The length measuring counter 24 is for measuring the length of the magnetic tape 6 that has been sent out, and the scrap length counter 25 is for measuring the length of the magnetic tape 6 of the scrap finder 23. Further, the cassette is taken out from the cassette removal port 26.

The cleaning device 1a is configured to engage the magnetic tape 6 that is stretched between the length measuring roller 17 and the roller 19 of the cushion arm 18 and pass through at high speed, and perform mirror polishing and dust removal on the front and back surfaces of the magnetic tape 6. It is something that will be done. That is, the cleaning tape 27 made of cloth or paper is sent out from the supply reel 28, passes through the cleaning section 29, and is wound around the cleaning tape winding motor 30. Its movement speed is extremely slow. Although the detailed structure of the cleaning section 29 is omitted, the cleaning tape 27 first contacts the magnetic surface on the front surface of the magnetic tape 6 at this location, and then turns around and contacts the film surface on the back surface of the magnetic tape 6. It is formed. The low-speed contact action performs mirror polishing and dust removal on the magnetic tape 6.

[Purpose of the Invention: Problems to be Solved] The cloth or paper cleaning tape 27 commonly used in the past has a coarse mesh, and fine dust gets stuck in its fibers. The magnetic tape 6 is dragged by the dust when it comes into contact with the magnetic tape 6 and passes through the magnetic tape 6, causing scratches on the magnetic tape 6. Further, since the mesh is coarse, fine dust on the magnetic tape 6 cannot be removed even if the cleaning tape 27 is moved at a low speed. In addition, since the cleaning tape 27 is made of cloth or paper, it is not possible to firmly press the cleaning tape 27 against the magnetic tape 6, and when it is pressed, the mesh of the magnetic tape 6 is rough and the magnetic material of the magnetic tape 6 is peeled off, which is a so-called drop. An out phenomenon occurs.

In other words, there is a drawback that the surface becomes rough instead of smooth.

The above-mentioned problems become more serious as the passing speed of the magnetic tape 6 becomes faster, and in high-speed video printers, the problem arises that dust and the like cannot be removed sufficiently from the magnetic tape 6. Therefore, the prior art also has the disadvantage that the efficiency of the dust removal device becomes extremely poor when operating at high speed.

On the other hand, in order to create an environment that prevents dust and dirt from adhering to the magnetic tape 6 from the beginning, magnetic tapes such as video and DAT are stored in a dedicated cleaning room that does not require mirror polishing or dust removal of the magnetic tape processor. There are some that perform 6 winding and printing. However, the cleaning room is extremely expensive, and the magnetic tape 6
It is impossible to eliminate the need for dust removal, etc.

The present invention solves most of the many drawbacks and problems of one or more of the conventional techniques, and dramatically improves the ability to collect dust and the like compared to the conventional techniques, and improves the mirror polishing and dust removal of magnetic tapes. It does this reliably and satisfactorily, does not damage the magnetic tape, generates almost no static electricity due to friction, and can adequately handle magnetic tapes passing at high speed. 2. The mirror finish treatment according to claim 1, which is applied to a ceramic edge which does not require any expensive equipment such as a cleaning room.

The purpose of the present invention is to provide a method and device for removing dust.

[Configuration of the Present Invention: Means for Solving Problems] In order to achieve the above object, the present invention provides ceramic rings having a slightly obtuse tip angle on the front and back surfaces of a magnetic tape that passes in a stretched state. The mirror finishing and dust removal method according to claim (1) is characterized in that the tip of the edge is pressed into contact with the ceramic edge while adjusting the engagement posture with the magnetic tape, and the method is carried out. As a means for this purpose, there is a cleaning device for polishing the magnetic tape and removing dust, which is installed on the way of the magnetic tape fed out from the supply reel and passed through various rollers while being stretched. a rotating base rotatably supported on the side; at least one pair of ceramic edge poles rotatably supported on the rotating base; and a surface of the magnetic tape fixed to the ceramic edge poles. The mirror finishing and dust removal apparatus according to claim (1) is constituted by a ceramic edge provided with an edge of a ceramic ring having a slightly obtuse tip angle whose tip end is in contact with the back surface.

[Function] The tip of the edge of the ceramic ring, which has an acute tip angle, is pressed against the front and back surfaces of the magnetic tape that is stretched and passing at high speed. By pressing the edge with the tip angle, the front and back surfaces of the magnetic tape are lapped and polished to a mirror finish, and any adhering dust or the like is wiped away.

The hardness of the edge of the ceramic ring and its tip angle are selected in accordance with conditions such as the properties of the magnetic tape and the speed at which it passes. Ceramic is extremely smooth, so even if the edge is pressed against the magnetic tape, it is unlikely to cause scratches on the magnetic tape. Therefore, compared to conventional cleaning tapes, it can be pressed more strongly against the magnetic tape, improving dust removal efficiency. I can do it. Further, the edge is fixed to a ceramic edge pole, and the ceramic edge pole is rotatably supported on a rotating base, and the rotating base is also rotatably supported on the fixed side. The engagement posture with the magnetic tape can be adjusted to any desired shape. That is, the edge can be adjusted and positioned to the optimal engagement position. Further, since the edge is a ceramic ring, there is almost no wear, and the mirror finish and dust removal function can be maintained semi-permanently.

[Example] An embodiment of the present invention will be described below based on the drawings.

[Embodiment 1] FIG. 1 shows a cleaning device H1 which is a main part of a device for mirror-finishing a magnetic tape 6 and removing dust.

Edge 2 has a nearly obtuse tip angle θ as shown in Figure 2.
It is made of a ceramic material having an appropriate hardness. The edge 2 is fixed to a ceramic edge pole 3 (hereinafter referred to as edge pole 3).

The edge pole 3 is made of a cylindrical body, is rotatably supported near the periphery of the rotary base 4 via a pin 5, and is fixed to the rotary base 4 side by a fixture (not shown).

In this embodiment, the pair of edge poles 3, 3 are connected to the rotating base 4.
The tip of the edge 2 of one edge pole 3 is in pressure contact with the surface side of the magnetic tape 6, and the edge 2 of the other edge pole 3 is placed facing the top of the magnetic tape 6.
is placed so as to be in pressure contact with the back surface of the On the other hand, the rotating base 4
is rotatably supported around a center point by a circuit support mechanism on the fixed side of the device, and a long groove 7 is formed on its outer edge side to restrict its rotation range. Further, an adjusting screw 8 disposed in the long groove 7 is used to fix the rotating base 4 at a predetermined rotating position after adjustment. Long roller 17 and cushion arm 18
and the roller 19 of.

By loosening the adjustment screw 8 and rotating the rotating base 4, and rotating the edge pole 3 around the bin 5, the edge 2 maintains an appropriate pressing force and engagement posture, and the magnetic tape 6 is
This results in pressure welding engagement.

That is, by rotating the rotating base 4 and the edge pole 3, the angle and pressing force for attaching the edge 2 and the magnetic tape 6 can be freely changed, and the edge 2 can be placed in the most effective position.
The tip of the can be adjusted and positioned.

Dust attached to the front and back surfaces of the magnetic tape 6 is removed from the edge 2.
It is wiped off and removed, and is wrapped and mirror-finished by the pressing force of the hard and smooth ceramic edge 2.

[Example 2] In FIG. 3, the horizontal axis shows the hardness of the edge 2, and the vertical axis shows the lapping effect [%]. Wrapping effect [%]
The higher the value, the more excellent the mirror finish effect will be. As shown by the curve ■, the higher the hardness, the higher the wrapping effect.6 In this example, the hardness ranges from 3 to 9.
Although those within this range can be used, a hardness of 9 is most desirable because the higher the hardness, the finer the density, the less change over time, and the higher the mirror finish effect and dust collection effect.

FIG. 4 shows the relationship between the tip angle θ [°] and the lapping effect [%] for Edge 2 having a hardness of 9.

As shown in the curve ■, the wrapping effect is higher when the tip angle θ is acute. However, when the tip angle θ is 60[”]
If it is less than that, there is a risk that the magnetic tape 6 may be damaged or its magnetic material may be peeled off. Also, as shown in the figure, θ
If it exceeds 120 [''], the wrapping effect will be extremely reduced, which is more than 0. Therefore, in this example, the wrapping effect is 90 [''] ± 30.
An edge 2 having a tip angle θ in the range [''] is adopted.

[Embodiment 3] [Embodiment 3] is an example of a video magnetic tape winder equipped with the cleaning device 1 described in [Embodiment 1] as shown in FIG. In FIG. 1, the same reference numerals as in FIG. 6 are the same or have the same functions.

The magnetic tape 6 wound around the supply reel 1o that is pivotally supported on the main body case 9 (fixed side of the device) passes through the supply slice section 12, which is a switching section between the supply reel 1o and the spare supply reel 11, and then passes through the roller. The tension is adjusted by winding it around the roller 16 of the dancer arm 15 via 13 and 14.

From length measuring roller 17 to roller 19 of cushion arm 18
After passing through the pinhole detection product 20 and falling from the case stocker 21 to the cassette holder 22, the circuit is wound onto a take-up reel inside the case.

The cleaning device 1 is disposed between the length measuring roller 17 and the roller 19 of the cushion arm 18.

The magnetic tape 6 is moved from the length measuring roller 17 to the roller 19.
While passing through, the magnetic tape 6 functions to mirror-finish the front and back surfaces of the magnetic tape 6 and remove dust. As described above, the rotating base 4 of the cleaning device 1 is rotatably supported on the main body case 9 side, and the edge poles 3, 3 arranged near the outer edge of the rotating base 4 are attached to the rotating base 4. Rotatably supported.

The edges 2, 2 fixed to the edge poles 3, 3 are arranged so as to be pressed against the front and back surfaces of the magnetic tape 6, so that the magnetic tape 6 is fed out from the supply reel 10.
is lapped and smoothed by the pressing force of the ceramic edges 2, 2 pressed against the front and back surfaces, and adhering dirt, dust, etc. are rubbed off, and dirt removal is performed with high efficiency.

For example, the test results shown in Table 1 compare the dust removal efficiency and wrapping effect of the conventional technique and the method of the present invention. Specifically, the number of "flaws in dust" on the surface of the magnetic tape after cleaning was measured using a dropout measuring device, the results were compared, and as shown in the table,
The average number of dropout counts per minute was detected.

The first grain represents the sampling width of the magnetic tape surface in time, which is 15 [μS], and the cleaning effect of the conventional technology is that the average number of counts per minute is 9.8 [counts/minute].
On the other hand, when another part of the same tape was cleaned by the apparatus of the present invention, the number of counts was 4.8 [pieces/minute], which was less than half of the conventional value.

In addition, in the second grain inspection, the sampling width was set to 5 [μS].
However, while the result obtained by the conventional technique was 13.4 [counts/min], the result obtained by the method of the present invention was 7.5 [counts/min], which is a reduction in the number of counts by nearly half.

That is, according to the results of the above-mentioned two tests, it was found that according to the method and apparatus of the present invention, the degree of cleanliness of the magnetic tape surface was approximately twice as high as that of the prior art.

Table 1 Comparison table of dropout inspection results using a dropout measuring device after cleaning the magnetic tape surface between the method of the present invention and the prior art [Example 3] Cleaning equipment for processing and garbage removal equipment! 1 is installed, and it goes without saying that even if the cleaning device 1 is applied to various other devices that use other magnetic tapes 6, it is within the technical scope of the present invention. be.

Further, in [Embodiment 3], a case has been described in which the cleaning device 1 is disposed at only one location, but it may be disposed at multiple locations. Also.

Although two edge poles 3 are arranged on the rotating base 4, the present invention is not limited thereto.

[Effects of the present invention] According to the present invention, the following remarkable effects are achieved.

1) By press-contacting a highly hard and smooth ceramic edge to the magnetic tape, the magnetic tape is polished to a mirror finish, and compared to conventional technology, dust is removed almost completely on the flying side, and there is no dropout. Very few.

2) Since the ceramic edge has high hardness, wear resistance, and micro-density, fine particles are clearly marked and the magnetic tape is cleaned of dust. Furthermore, even when the magnetic tape passes at high speed, there is almost no wear on the edges, so it can be used semi-permanently.

Furthermore, almost no static electricity is generated due to friction.

3) By setting the hardness of the edge and its tip angle in accordance with the properties and passing speed of the magnetic tape, no scratches or the like will occur on the magnetic tape side. 4) Mirror finishing and dust removal are ensured. , and because it is carried out with high efficiency, large-scale equipment such as a cleaning room is required2.
It does not require any machinery, and it is also possible to operate at high speeds to produce cleaning tapes that far exceed conventional standards.It is possible to obtain results that are far superior to conventional technologies in terms of both weight and weight. Manufacturing costs can also be reduced tremendously.

[Brief explanation of drawings]

FIG. 1 is a plan view showing the detailed structure of a cleaning device according to an embodiment of the present invention, FIG. 2 is an enlarged plan view showing the shape of a ceramic edge pole and an edge fixed thereto, and FIG.
The figure is a diagram showing the relationship between edge hardness and lapping effect, and FIG. 4 is a diagram showing the relationship between edge tip angle θ and lapping effect. FIG. 5 is a plan view showing the general structure of a video magnetic tape winder equipped with the cleaning device of this embodiment;
The figure is a plan view showing the general structure of a video magnetic tape winder equipped with a conventional cleaning section.
FIG. 3 is an enlarged plan view showing the detailed structure of the cleaning section shown in the figure. 1.1a...Cleaning device, 2...Edge,
3...Ceramic Edgepol (Edgepol), 4
...Rotating base, 5..Pin, 6..Magnetic tape,
7. Long groove, 8. Adjustment screw. 9. Main body case, 10. Supply reel. 11... Spare supply reel, 12... Supply splice section, 13, 14, 16, 19... Roller,
15...Dancer arm, 17...Length measuring roller,
18... Cushion arm, 20... Pinhole detector, 21... Case stocker. 22..Cassette holder, 23..Scrap finder, 24..Length measurement counter, 25..Scrap length counter, 26..Cassette outlet, 27..
・Cleaning tape, 28... Supply reel, 2
9. Cleaning section, 30. Cleaning tape winding motor. Figure 1 Figure 2 Figure 3 Figure 0 306090120150 Angle (θ0) - Figure

Claims (4)

[Claims] (1) On the front and back surfaces of a magnetic tape passing under tension, the tip of the ceramic edge of the numeral, whose tip is linear in plan view, is placed at an engagement angle with the magnetic tape. A method for mirror polishing and removing dust from a magnetic tape using a ceramic edge which is characterized by adjustable pressure contact. (2) Claim (1) wherein the ceramic edge is formed from a material having a Mohs hardness in the range of 3 to 9, and the cross-sectional angle of the tip thereof is 90 [°] ±30 [°].
Mirror polishing and dust removal method for magnetic tape using ceramic edge described in . (3) A cleaning device for mirror-polishing and removing dust from the magnetic tape, which is installed in the middle of the magnetic tape that is sent out from the supply reel and passes through various rollers while being stretched. a rotary base movably supported; at least one pair of ceramic edge poles rotatably supported on the rotary base; and fixed to the ceramic edge poles on the front and back surfaces of the magnetic tape; A mirror polishing and dust removal device for magnetic tape using a ceramic edge, characterized in that a plurality of edges made of ceramic are provided to press a straight end portion in a planar shape. (4) The ceramic edge according to claim 3, wherein the ceramic edge is formed from a material having a Mohs hardness in the range of 3 to 9, and the cross-sectional angle of the tip thereof is 90 [°] ± 30 [°]. Mirror polishing and dust removal device for magnetic tape using edges.