JPH0355907B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of 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 relates to an improvement in a device that removes foreign matter using air flow.

B. Prior Art Most commonly, a cleaning tape is brought into contact with the surface of a magnetic tape to remove foreign matter.

The cleaning tape is slowly wound up 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 and causes 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.

C. Purpose of the present 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 an apparatus for removing foreign matter from a magnetic tape, which can effectively remove foreign matter from the surface of the tape while consuming less air.

D. Means for solving the conventional problems An air blowing member is provided to blow air onto the surface of the magnetic tape. The blowing member approaches but does not contact the surface of the magnetic tape, 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 blown is increased to prevent the magnetic tape from coming into contact with the blowing member, and when the tension of the magnetic tape is low, the amount of air blown is reduced to reduce air consumption. do.

E. Effect The airflow ejected from the 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 Embodiments Hereinafter, embodiments of the present invention will be described 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 , an air filter 6 that filters the air taken in by the air source 5 , a tension sensor 7 that detects the tension of the magnetic tape 2 , and this tension sensor 7 The air blowing control member 8 is controlled by the air blowing member 8 to control the air blowing amount of the blowing member 4.

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 9 that drives the delivery side reel shaft
and a mechanism that controls the rotational speed of the reel on the winding side, which is the winding means, with the motor 10 that rotates the reel shaft so that a constant tension is applied to the magnetic tape 2, or As shown in FIG. 2, a tension arm 11 or the like having a blowing member 4 attached to its tip 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.

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 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 .

The air outlet 12 may be formed in a slit shape with a length approximately equal to the width of the magnetic tape 2, as shown in FIGS. 3 and 4, or as shown in FIGS. 5 and 6. In some cases, the porous member 13 has a large number of pores, and in other cases, as shown in FIGS. 7 and 8, a large number of pores are formed 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 an 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.

The magnetic tape tension sensor 7 shown in FIG.
Detect the rotation angle of 1. Tension arm 11
The lower end of the magnetic tape 2 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 viewed in FIG. Magnetic tape 2 is usually 30 to 100
A tension of approximately g is applied to the winding. Therefore, the tension spring 15 shown in FIG. 2 is pulled by the magnetic tape 2 on both upper and lower sides, and pulls the tension arm 11 so as to balance the leftward force of 60 to 200 g.

The tension sensor 7 that detects the rotation angle of the tension arm 11 includes all sensors that can detect the movement or rotation angle displacement of the tension arm 11, for example,
Movable transformers, movable resistors, rotary encoders, etc. can be used.

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 out from the blowing member when a large number of valves are opened, and decreases the amount of air blown out when a small number of valves are opened.

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

Although not shown, a plurality of control units each consisting of a magnetic tape tension sensor and a blowout control member are provided.
It is also possible to control the air blowing amount of the blowing member near the tension detection position with each control unit.

G. Operation When the tension of the magnetic tape 2 is high, the lower end of the tension arm 11 touches the tension spring 15 in FIG. 2 and moves to the left, and this is detected by the tension sensor 7. Based on the output of the tension sensor 7, the blowout control member 8
When the blowing member 4 is controlled to blow out a large amount of air and the tension of the magnetic tape 2 becomes low, this is detected by the tension sensor 7, and the blowing control member 8 controls the blowing member 4 to blow out a large amount of air from the magnetic tape 2. Reduce the amount of air blown onto the

As shown by the chain line in FIG. 2, an air cylinder 17 is used instead of the tension spring 15, and the air cylinder 1
7, it is also possible to elastically pull the lower end of the tension arm 11 to the right.

When the tension of the magnetic tape 2 is high, the lower end of the tension arm 11 is moved more to the left, and this is detected by the tension sensor.

H Effects of the Invention The device for removing deposits on a magnetic tape of the present invention not only blows out foreign matter with air by bringing the blowing member close to the surface of the magnetic tape in a non-contact state, but also It is located inside the curved passage. 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.

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.

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 airflow, the air consumption can be extremely reduced. Incidentally, according to experiments conducted by the present inventor, the magnetic tape deposit removal device of the present invention consumes 200% less air per device than a device that does not control the amount of air blown out.
/min.

I Definitions of Terms Used in this Specification In this specification, a magnetic tape tension sensor is defined as:
Needless to say, members that directly detect the tension of the magnetic tape, as well as means that indirectly detect the tension, for example, when the tension changes in a predetermined pattern during the winding process of the magnetic tape, The state in which this tension changes is stored in a computer, etc.,
The term "computer" shall be interpreted in a particularly broad sense to include means capable of controlling the air blowout control member in accordance with a stored pattern of tension changes.

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 blow-off control member. DESCRIPTION OF SYMBOLS 1... Reel, 2... Magnetic tape, 3... Winding means, 4... Blowing member, 5... Air source, 6... Air filter, 7... Tension sensor, 8... Blowing control member, 9 ...Motor, 10...Motor, 11...
Tension arm, 12...Air outlet, 13...Porous member, 14...Exhaust duct, 15...Tension spring, 16...Opening/closing valve, 17...Air cylinder.

Claims (1)

[Scope of Claims] 1. A winding means for pulling out and winding a magnetic tape wound on a reel; a tension means for applying a predetermined tension to the magnetic tape pulled out from the reel and wound on the winding means; The device approaches the surface of the magnetic tape without contacting it, and is placed inside the corner of the bend where the magnetic tape is bent at a required radius of curvature and transported, and blows air onto the magnetic tape. an air blowing member for removing foreign matter, an air source for supplying pressurized air to the air blowing member, and an air source connected to the suction side of the air source for filtering the air drawn into the air source. The magnetic tape attachment is equipped with an air filter, and is configured such that air sucked into the air source through the air filter is blown onto the magnetic tape surface from a blowing member to remove foreign matter from the magnetic tape surface. The kimono removing device is equipped with a magnetic tape tension sensor and a blowout control member that controls the air blowout amount of the blowout member, and the tension sensor detects the tension of the magnetic tape and when the tension of the magnetic tape is high. so that when the blowing member blows out a large amount of air and the tension of the magnetic tape is low, the air blowing amount of the blowing member is reduced;
A magnetic tape deposit removal device configured to control the air blowing amount of a blowing control member or a blowing member using a tension sensor. 2. The magnetic tape deposit removal device according to claim 1, wherein the blowing member is attached to the tension arm, and 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 to 30~
The apparatus for removing deposits on a magnetic tape according to claim 1, wherein the magnetic tape is controlled to a range of 100 g.