JPH0326474B2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a device for removing foreign matter such as dust that adheres to the surface of a magnetic tape during transport, and more particularly to a device for removing foreign matter using airflow.

[Prior art and its problems]

Magnetic tape most commonly has its surface contacted with a cleaning tape to remove foreign matter. The cleaning tape is slowly wound up so as to move relative to the magnetic tape, and this tape rubs the surface of the magnetic tape to remove foreign matter. Therefore, a considerable amount of cleaning tape was consumed to clean the magnetic tape. Furthermore, an apparatus has been developed in which an air blower is provided in a non-contact manner close to the running surface of the magnetic tape (Japanese Patent Laid-Open No. 53-67418). In this device, a large number of air ejection holes are provided on the surface of an air ejector, from which pressurized air is ejected toward the surface of the magnetic tape. Air suction holes are provided on both sides of the air jet to suck in the jetted air. This device uses airflow to remove foreign matter adhering to the surface of the magnetic tape. This device removes particulate dust that adheres to the surface of the air jet by using air floating magnetic tape.
When the air-floated magnetic tape comes into contact with the surface of the air ejector, the magnetic tape has the disadvantage that the surface is easily scratched. A conventional air blower has a large number of air blow holes on its surface and blows air through the holes to make the magnetic tape air floating. An air blower having this structure has the disadvantage that the magnetic tape comes into contact with the tape and is easily scratched. This is because air is injected locally from the air ejection holes, so it is difficult to create a uniformly thin air film over the entire surface of the air ejector. For this reason, a device having this structure has the drawback that the magnetic tape is likely to come into contact with the surface of the air jet and be scratched, resulting in a reduction in the quality of the magnetic tape, which is extremely important. SUMMARY OF THE INVENTION An object of the present invention is to provide a magnetic tape deposit removal device that can more completely clean the magnetic tape surface and minimize damage to the magnetic tape surface during the cleaning process.

[Means to solve conventional problems]

The magnetic tape deposit removal device of the present invention has the following configuration in order to achieve the above-mentioned object. (a) The deposit removing device includes a winding means, a tension means, an air blowing member, an air source, and an air filter. The winding means pulls out and winds up the magnetic tape wound on a reel. The tension means applies a predetermined tension to the magnetic tape that is pulled out from the reel and wound around the winding means so that the magnetic tape runs with a constant tension on the surface of the air blowing member. The air blowing member blows air onto the magnetic tape, and uses the airflow to remove foreign matter adhering to the surface of the magnetic tape. The air source supplies pressurized air to the air blowing member. An air filter is connected to the intake side of the air source to filter and clarify the air that is drawn into the air source. (b) In order to remove foreign matter without scratching the magnetic tape, the air blowing member approaches the surface of the magnetic tape but does not come into contact with it, and the magnetic tape is bent at the required radius of curvature. It is placed inside the corner of the bent part that is transported. (c) The part of the air blowing member that blows air onto the magnetic tape surface is made of a porous member with numerous pores so that a thin air film can be created between the air blowing member and the magnetic tape. ing. (d) The air sucked into the air source through the air filter is blown out from the porous member of the blowing member onto the surface of the magnetic tape, and the airflow is configured to remove foreign matter from the surface of the magnetic tape.

[Action, effect]

The magnetic tape adhesion removal device of the present invention allows the magnetic tape to pass close to but not in contact with the surface of the air blowing member. In this state, the magnetic tape passing near the air blowing member passes through without coming into contact with the air blowing member. The tension of the magnetic tape is adjusted, and
This is because a uniform air layer is formed over the entire surface facing the magnetic tape of the air blowing member. The reason why a uniform air film is formed in the air blowing member is that the air blowing member is made of a porous member having numerous pores. When air is injected from partially drilled air holes as in the past, the air pressure near the air is high;
The air pressure on the surface decreases as you move away from the air hole, making it impossible to create a uniform air layer over the entire surface. However, in the deposit removing device of the present invention, a porous material that injects air from numerous pores is used for the air blowing member. The air ejected from countless pores creates a uniform film of air over the entire boundary with the magnetic tape. The air film provided in this state has extremely little local pressure fluctuation, and the contact surface with the magnetic tape is in an ideal air floating state.
To minimize the contact of the magnetic tape with the air blowing member. This has the advantage that scratches caused by the magnetic tape coming into contact with the air blowing member can be minimized. This is an extremely important feature of a magnetic tape deposit removal device. This is because magnetic tapes are increasingly required to have higher quality, and as storage density increases, stricter characteristics against bit errors and the like are required. Further, in the magnetic tape deposit removal device of the present invention, the blowing member is disposed inside the bending path of the magnetic tape. For this reason, even with tension means,
By adjusting the tension of the magnetic tape, the distance between the magnetic tape and the air blowing member can be adjusted, and the magnetic tape can be brought very close to the air blowing member. When the magnetic tape is brought close to the blowing member, foreign matter adhering to the surface of the magnetic tape is very effectively removed by the high-speed air flow blown out from the blowing member. For this reason, more complete foreign matter removal can be achieved without using conventional cleaning tape at all or by using it in combination with cleaning tape, and the cleaning tape can be designed to have a low foreign matter removal rate, reducing the consumption of cleaning tape. By reducing the amount of cleaning tape or by weakening the contact pressure between the cleaning tape and the magnetic tape, it is possible to remove foreign matter by minimizing damage to the surface of the magnetic tape.

[Preferred embodiment]

Embodiments of the present invention will be described below based on the drawings. The magnetic tape deposit removal device shown in FIG.
a winding means 3 for pulling out and winding the magnetic tape 2 wound on the reel 1; and the magnetic tape 2.
a tension means for applying a predetermined tension to the
Air blowing member 4 arranged in the path of the magnetic tape
, an air source 5 that pumps clear filtered air to the blowing member 4, and an air filter 6 that filters the air taken in by the air source 5. As the tension means, any mechanism capable of applying a certain tension to the magnetic tape can be used so that the magnetic tape 2 is pressed against the surface of the blowing member 4 with a required pressure. For example, a brake may be provided on the reel shaft to which the reel 1 on the delivery side is attached, or
Alternatively, the motor 7 that drives the delivery side reel shaft
A mechanism for controlling the rotational speed of the reel on the winding side, which is the winding means, with the motor 8 that rotates the reel shaft so that a constant tension is applied to the magnetic tape 2 can be used as the tension means. The stronger the tension used for magnetic tape 2, the
The magnetic tape 2 approaches the surface of the blowing member 4. Therefore, the stronger the tension of the magnetic tape 2, the higher the air blowing pressure of the blowing member 4 or the larger the blowing area to increase the air volume. As the winding means 3, any means capable of winding up the magnetic tape 2 sent out from the reel 1 can be used. The winding means 3 winds up a large diameter reel on which a long magnetic tape 2 is wound, and winds up a reel of video tape, audio tape, etc. stored in a cassette. When the winding means 3 winds up a reel of cassette tape or the like, this device is installed in the step of winding the magnetic tape from the large reel to the cassette tape. The blowing member 4 is located at the inner corner of the corner where the magnetic tape 2 is bent at a required radius of curvature instead of being straight so that the magnetic tape 2 is approached with a relatively strong approach force in a non-contact state. will be placed in As shown in FIG. 2, the blowing member 4 has numerous pores opened by a porous member 10. The air flow blown out from the numerous pores blows away foreign matter adhering to the surface of the magnetic tape 2 without contacting the blowing member. The foreign matter blown off from the magnetic tape 2 is preferably sucked into an exhaust duct opened near the blowing member and removed. As the air source 5 for sending pressurized air to the blowing member 4, any device capable of compressing and pumping the air filtered by the air filter 6, such as a compressor, can be used. As shown in FIG. 1, the magnetic tape 2 is provided with blowing members 4 close to both surfaces to remove foreign matter adhering to both surfaces.

[Brief explanation of the drawing]

FIG. 1 is a front view showing a tape winder equipped with a magnetic tape deposit removing device according to an embodiment of the present invention, and FIGS. 2 and 3 are sectional views showing a specific example of a blowing member. It is a front view. DESCRIPTION OF SYMBOLS 1... Reel, 2... Magnetic tape, 3... Winding means, 4... Blowing member, 5... Air source, 6... Air filter, 7... Motor, 8... Motor, 10
...Porous member.

Claims (1)

[Scope of Claims] 1. A magnetic tape deposit removal device having the following configuration. (a) The deposit removal device includes a winding means 3 that stretches and winds the magnetic tape 2 wound around the reel 1.
, a tensioning means that applies a predetermined tension to the magnetic tape 2 that is pulled out from the reel 1 and wound onto the winding means 3; and an air blowing member 4 that blows air onto the magnetic tape 2 to remove foreign matter.
, an air source 5 for supplying pressurized air to the air blowing member, and an air filter 6 connected to the suction side of the air source to filter the air sucked into the air source. . (b) The air blowing member 4 is disposed close to the surface of the magnetic tape 2 without contacting it, and moreover, inside the corner of the bending part where the magnetic tape 2 is bent with a required radius of curvature and transported. has been done. (c) The air blowing member 4 is composed of a porous member 10 in which a countless number of pores are opened, in which the air is injected onto the surface of the magnetic tape. (d) The air sucked into the air source 5 through the air filter 6 is blown out onto the surface of the magnetic tape from the porous member 10 of the blowing member, and the airflow is configured to remove foreign matter from the surface of the magnetic tape. ing.