JPS6139283A - Attachment removing device of magnetic tape - Google Patents

Abstract

PURPOSE:To decrease unnecessary consumption of air by controlling an air blowing-off quantity to the most suitable value in accordance with a tensile strength of a magnetic tape without always blowing off fixed air by a blowing- off member. CONSTITUTION:An attachment removing device of a magnetic tape controls a whole air blowing-off quantity of a blowing-off member with a single tensile strength sensor 7 and a blowing-off control member 8. When a tensile strength of a magnetic tape 2 is high, a tension arm 11 is shifted to the left while the lower end is connected to a tension spring 15, and this fact is detected by the tensile strength sensor 7. By the output of the tensile strength sensor 7, the blowing-off control member 8 is controlled so that the blowing-off member 4 may blow off a large quantity of air, and to the contrary, when the tensile strength of the magnetic tape 2 is low, the fact is detected by the tensile strength sensor 7, and the blowing-off control member 8 can decrease an air quantity blow off to the magnetic tape 2.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Industrial Application 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 particularly to an improvement of a device that removes foreign matter using air flow. Regarding.

B. Prior Art Magnetic tape is most commonly contacted with IJ-coating tape to remove foreign matter from the surface.

The cleaning tape is slowly wound so as to move relative to the magnetic tape, and the cleaning tape scrapes the surface of the magnetic tape to remove foreign matter. Therefore, a considerable amount of cleaning tape was consumed to clean the magnetic tape.

Further, according to this method, foreign matter adhering to the surface of the magnetic tape is wiped off by the cleaning tape, which temporarily scratches the surface of the magnetic tape, causing damage.

In order to avoid this drawback, increasing the feeding speed of the cleaning tape resulted in an increase in the amount of cleaning tape consumed. Ideally, a device for removing foreign matter adhering to the surface of a magnetic tape would be able to remove foreign matter without causing any damage to the surface of the magnetic tape.

C0 Purpose of the Invention The present invention provides a magnetic tape surface that can be cleaned more completely without using any cleaning tape or with a small amount of cleaning tape, and that can minimize damage to the magnetic tape surface during the cleaning process. The present invention provides a tape deposit removal device.

Another important object of the present invention is to provide a magnetic tape adhesion removal device that can effectively remove foreign substances adhering to the surface with less air consumption.

D. Means for Solving the Problems of the Conventional Method An air Suita member is provided for blowing air onto the surface of the magnetic tape. The blowing member approaches the surface of the magnetic tape but does not come into contact with it, and is disposed inside the corner of the bent portion where the magnetic tape is bent with a required radius of curvature. Air is jetted onto the tape surface to blow away foreign matter adhering to the surface.

The amount of air blown out of the blowout member is controlled by a blowout control member. The blowout control member is controlled by a tension sensor that detects the tension of the magnetic tape. When the tension of the magnetic tape is high, the amount of air blowing increases and the magnetic tape comes into contact with the blowing member.
When the tension of the magnetic tape is low, the amount of air blown out is reduced, reducing air consumption.

The airflow ejected from the E1 action blowing member to the magnetic tape surface blows away foreign matter on the magnetic tape surface. The amount of air blown out from the blowing member is adjusted in accordance with the tension of the magnetic tape, thereby limiting the amount of air consumed.

F. Preferred embodiment Embodiments of the present invention will be described below based on the drawings.

The magnetic deso deposit removal device shown in FIG.
a winding means 3 for pulling out and winding the magnetic tape 2 wound on the reel 1; a tension means for applying a predetermined tension to the magnetic tape 2; and an air blowing member 4 disposed in the path of the magnetic tape. An air source 5 that pumps filtered air to be purified to the blowing member 4, an air filter 6 that filters the air taken in by the air I15, and a tension sensor 7 that detects the tension of the magnetic tape 2. Both blow-off side members 8 control the amount of air blowing out from the blow-off member 4.
It is equipped with

As the tension means, any mechanism that can apply 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 a motor 9 that drives the reel shaft on the delivery side and a motor that rotationally drives the reel shaft for the reel on the take-up side, which is the winding means. A mechanism for controlling the rotational speed of the magnetic tape 10 so that a constant tension is applied to the magnetic tape 2, or a tension arm 1 having a blowing member 4 attached to its tip, as shown in FIGS. 1 and 2. ) etc. can be used as tension means.

The stronger the tension applied to the magnetic tape 2, the closer 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.

The winding means 3 takes up the magnetic tape 2 fed out from the reel 1.
Anything that can be rolled up 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 a cassette tape or the like, this device is installed in the process of winding the magnetic tape from the large reel to the cassette tape.

The blowing member 4 is arranged at an angle at which the magnetic tape 2 is bent at a required radius of curvature rather than in a straight line so that the magnetic tape 2 is approached with a relatively strong approach force in a non-contact state. placed inside.

The blowing member 4 has an air blowing port 12 opened on the surface facing the surface of the magnetic tape 2 .

As shown in FIGS. 3 and 4, the air outlet 12 may be formed in a slit shape with a length approximately equal to the width of the magnetic tape 2, or as shown in FIGS. 5 and 6. , porous member 1
In some cases, a large number of pores are opened, as shown in FIGS. 1 and 8, and in other cases, many pores are opened in a dense manner.

The air flow blown out from the blow-off port 12 blows away foreign matter adhering to the surface of the magnetic tape 2 without contacting the blow-off member.

The foreign matter blown off from the magnetic tape 2 is preferably sucked into an exhaust duct 14 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 clear air filtered by the air filter 6, such as a compressor, can be used.

As shown in FIG. 1, the magnetic tape 2 is preferably provided with blowing members 4 close to both surfaces to remove foreign matter adhering to both surfaces.

A magnetic tape tension sensor 7 shown in FIG. 2 detects the rotation angle of a tension arm 1) having a blowing member 4 attached to its tip. The lower end of the tension arm 1) is elastically pulled by a tension spring 15 to the right in the direction in which tension is applied to the magnetic tape 2, as seen in FIG. The magnetic tape 2 is normally wound with a tension of about 30 to 100 g. Therefore,
The tension spring 15 in FIG. 2 is pulled by the magnetic tape 2 on both sides and pulls the tension arm 1) so that it can balance a leftward force of 60 to 200 g.

Tension arm 1) Tension sensor 7 that detects 0 rotation angle
All sensors capable of detecting the movement or rotational angular displacement of the tension arm 1) can be used, such as a movable transformer, a movable resistor, a rotary encoder, etc.

The blowout control member 8 is connected between the air source 5 and the blowout member 4, and all valves whose opening degree can be adjusted by the output of the tension sensor 7 are used.

When the blow-off control member 8 is opened wide, the blow-off member 4 injects a large amount of air, and when it is narrowed, the amount of air blown is reduced.

As shown in FIG. 9, the blowout control member 8 can also connect a plurality of on-off valves 16 in parallel to control the number of valves that are opened to control the air blowout amount of the blowout member 4. It is. The on-off valve 16 increases the amount of air blown by the blowing member when a large number of valves are opened, and decreases the amount of air blown when a small number of valves are opened.

The magnetic tape deposit removal device shown in FIG. 1 uses a single tension sensor 7 and a blowout control member 8 to control the amount of air blown out from all the blowout members 4. According to this structure, the control mechanism for the air blowout amount can be simplified.

Although not shown, it is also possible to provide a plurality of control units each consisting of a magnetic tape tension sensor and a blowout control member, and each control unit to fully control the air blowout amount of the blowout member in the vicinity of the tension detection position.

G. Operation When the tension of the magnetic tape 2 is high, the lower end of the tension arm 1) in FIG. 2 touches the tension spring 15 and moves to the left, and this is detected by the tension sensor 7. Tension sensor 7
With the output of , the blowout control member 8 is controlled so that the blowout member 4 blows out a large amount of air.Conversely, when the tension of the magnetic tape 2 becomes low, this is detected by the tension sensor 7, and the blowout control member 8 is controlled to blow out a large amount of air. , the amount of air that the blowing member 4 blows onto the magnetic tape 2 can be reduced.

As shown by the chain line in FIG. 2, it is also possible to use an air cylinder 17 instead of the tension spring 15 and to elastically pull the lower end of the tension arm 1) to the right with the air cylinder 17.

When the tension of magnetic tape 2 is high, tension arm 1)
The bottom edge is moved more to the left and this is detected by the tension sensor.

H1 Effects of the present invention The device for removing deposits on a magnetic tape of the present invention not only brings the blowing member close to the surface of the magnetic tape in a non-contact state to blow away all foreign matter with air, but also It is located inside the bending passageway. Therefore, simply by applying tension to the magnetic tape, the magnetic tape approaches the surface of the blowing member with a strong force. 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.

Therefore, it is possible to achieve more complete foreign matter removal by not using conventional cleaning tape at all or by using it in combination with cleaning tape, and because the cleaning tape can be designed to have a low foreign matter removal rate, the amount of cleaning tape consumed can be reduced. By reducing the contact pressure between the cleaning tape and the magnetic tape, it is possible to remove foreign substances with minimal scratches on the surface of the magnetic tape.

Furthermore, a noteworthy feature of the present invention is that the blowing member does not always blow out a fixed amount of air, but the amount of air blowing is controlled to an optimum value in accordance with the tension of the magnetic tape. That is, when the tension of the magnetic tape is high and there is a risk that the magnetic tape will approach or contact the surface of the blowing member more than necessary, the tension sensor and the blowing control member increase the amount of air jetted from the blowing member, and Furthermore, when the tension of the magnetic tape is weak and there is no risk of it approaching or coming into contact with the blowing member, the amount of air blown by the blowing member is reduced to reduce wasteful air consumption. Therefore, even though foreign matter on the surface of the magnetic tape is effectively removed by the air flow, the air consumption can be extremely reduced. Incidentally, according to the inventor's experiments, the magnetic tape deposit removal device of the present invention consumes 20% less air per device than a device that does not control the amount of air blown out.
It was possible to reduce the speed to 0.01/min.

1. Definitions of terms used in this specification In this specification, a magnetic tape tension sensor is not only a member that directly detects the tension of a magnetic tape, but also a means that indirectly detects the tension. For example, when the tension changes in a predetermined pattern during the magnetic tape winding process, the state in which the tension changes is stored in a computer, etc., and a computer is used to record the tension change in the memorized pattern. It shall be interpreted in a particularly broad sense to include means capable of controlling the air blowout control member accordingly.

The present invention does not limit the state in which the blowout control member controls the air blowout amount of the blowout member as in the embodiments.

In this specification, the air blowing control member includes all members that can control the amount of air blown out by the blowing member, for example, members that control the pressure of the air source to control the amount of air blown out by the blowing member. Used in a broad sense.

[Brief explanation of drawings]

Fig. 1 is a front view of a magnetic tape deposit removal device showing one embodiment of the present invention, Fig. 2 is an enlarged schematic view of the main part of Fig. 1, and Figs. 3 to 8 are specific examples of the blowing member. FIG. 9 is a block diagram showing an example of the blowout control member. 1. Reel, 2. Magnetic tape, 3. Means for taking, 4
・・Blowout member, 5φ・Air source, 6・・Air filter, 7
...Tension sensor, 8.Blowout control member, 9.Motor,
10...Motor, 1)...Tension arm, 12...
Air outlet, 13... Porous member, 14... Exhaust duct, 1
5.Tension nut, 16.Opening/closing valve, 17.Air cylinder, Fig. 1 Fig. 2 Fig. 3 Fig. 6 Fig. 8

Claims (4)

[Claims] (1) A winding means for pulling out and winding the magnetic tape wound on a reel, a tensioning means for applying a predetermined tension to the magnetic tape that is pulled out from the reel and wound on the winding means, and It approaches but does not come into contact with the magnetic tape, and is placed inside the corner of the bend where the magnetic tape is bent at the required radius of curvature and transported, and blows air onto the magnetic tape to remove foreign matter. The air blowing member includes an air blowing member, an air source that supplies pressurized air to the air blowing member, and an air filter that is connected to the suction side of the air source and filters the air sucked into the air source. This device is a magnetic tape deposit removal device configured so that air drawn into an air source through an air filter is blown onto the magnetic tape surface from a blowing member to remove foreign matter from the magnetic tape surface. The device is equipped with a magnetic tape tension sensor and a blowout control member that controls the air blowing amount of the blowout member, and when the tension sensor detects the tension of the magnetic tape and the tension of the magnetic tape is high, the blowout member The blowout control member is configured to control the air blowout amount of the blowout member using a tension sensor so that when a large amount of air is ejected and the tension of the magnetic tape is low, the air blowout amount of the blowout member is reduced. Equipment for removing deposits from magnetic tape. (2) The blowout member is attached to the tension arm,
A magnetic tape deposit removal device according to claim 1, wherein the tension sensor detects the rotation angle of the tension arm to detect the tension of the magnetic tape. (3) The magnetic tape deposit removal device according to claim (1), wherein the blowing member is connected to the cylinder, and the tension sensor detects the amount of rod withdrawal of the cylinder to detect the tension of the magnetic tape. (4) The tension means increases the tension of the magnetic tape by 30 to 1
An apparatus for removing deposits on a magnetic tape according to claim (1), wherein the magnetic tape is controlled to a range of 0.00 g.