JP2015193459A - Magnetic tape winding apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To wind up magnetic tape at a high speed in a satisfactory shape.SOLUTION: A magnetic tape winding apparatus 1 comprises: a rotating device for rotating a wind-up core for winding up magnetic tape MT; a push roller 21 contacting and rolling on an outer periphery of a tape roll TR at a magnetic tape feeding position P where the magnetic tape is fed onto the tape roll; a feeding direction control guide 22 arranged upstream of the push roller as viewed in a running direction of the magnetic tape and for controlling the running direction of the magnetic tape fed onto the push roller; and a movement device for moving at least one of the push roller and the feeding direction control guide such that the running direction of the magnetic tape fed to the magnetic tape feeding position matches a tangential direction of the tape roll at the magnetic tape feeding position. The push roller is configured such that the number of peaks is one or less in a contact pressure distribution in a width direction with respect to the tape roll.

Description

  The present invention relates to a magnetic tape winding device, and more particularly to a magnetic tape winding device that winds a magnetic tape cleanly at high speed.

  When winding a tape-like material such as a magnetic tape, it is desirable to wind it in a clean winding shape. In particular, recent magnetic tape records data with a very narrow track width, so if the tape edge is misaligned in the winding state, the magnetic head will change in the width direction of the magnetic tape during data recording / reproduction. You may not be able to follow up. Also, in recent magnetic tapes, servo signals for tracking are recorded on the recording layer at the time of production. However, if the winding state of the tape roll before recording the servo signals is disturbed, the magnetic tape There is a problem that the servo signal cannot be accurately recorded due to shaking. Further, when the winding form is disturbed, there is a problem that partial tape deformation occurs or the edge of the magnetic tape is easily damaged. Since recent magnetic tapes are thin, the above-mentioned problems are likely to occur.

  In the technique of Patent Document 1, the rolling appearance is improved by pressing a pressing roller against a tape roll, which is a wound tape, and eliminating air between the tape roll and the newly wound tape. The pressing roller is supported by a swingable swinging arm, and defines the direction of the magnetic tape entering the pressing roller by a position regulating roller provided on the swinging arm.

  Further, in the technique of Patent Document 2, in order to reduce the fluctuation of the pressing force on the pressing roller, the traveling direction of the tape entering the pressing roller is always in the tangential direction of the tape roll at the tape entering position where the tape enters the tape roll. Match.

JP 62-31645 A JP 2009-227417 A

  However, even if the above-described technology is used, if the winding speed of the magnetic tape is further increased or the conditions such as the smooth surface of the magnetic tape overlap, the tape roll and the magnetic tape that is newly wound around the tape roll It becomes difficult to discharge air between the tape and the friction between the tape roll and the magnetic tape is reduced, and problems such as the tape roll being displaced between the magnetic tapes are likely to occur.

  Therefore, an object of the present invention is to provide a magnetic tape take-up device that can take up a magnetic tape at a higher speed even under predetermined conditions.

  In order to solve the above-described problems, a magnetic tape winding device of the present invention includes a rotating device that rotates a winding core that winds up a magnetic tape, and a tape into which the magnetic tape enters a tape roll that is a wound magnetic tape. A pressure roller that is pressed and rolled on the outer periphery of the tape roll at the entry position, and an entry that is disposed upstream of the pressure roller in the running direction of the magnetic tape and that defines the running direction of the magnetic tape entering the pressure roller. A moving device that moves at least one of the pressure roller and the entry direction restriction guide so that the direction restriction guide, the tangential direction of the tape roll at the tape entry position, and the traveling direction of the magnetic tape entering the pressure roller coincide with each other. With. In this apparatus, the magnetic tape has a width of 12.644 to 12.656 mm, an arithmetic surface roughness Ra of the magnetic layer side surface of less than 4 nm, and an arithmetic average roughness Ra of the back layer side surface opposite to the magnetic layer. The thickness is 20 nm or less and the thickness is 4 μm or more and less than 6.6 μm. And the running speed of a magnetic tape is 10-12 m / s. Further, the pressure roller is configured such that the peak in the contact pressure distribution in the width direction with respect to the tape roll is one or less.

  According to such a configuration, the pressing roller abuts on the tape roll at a position where the tape enters the tape roll, and the entering direction of the tape into the pressing roller is defined by the entering direction regulation guide and the moving device. The Since the tape entry direction matches the tangential direction of the tape roll at the tape entry position, the magnetic tape is not wound around the pressing roller. Therefore, since the tension of the magnetic tape and its fluctuation do not affect the pressing force of the pressing roller to the tape roll, the pressing roller is prevented from being shaken, and the magnetic tape can be wound at a high speed and a beautiful winding shape.

  By the way, when the width of the magnetic tape is as narrow as 12.644 to 12.656 mm, the surface roughness of the magnetic tape is small, and the thickness is as thin as 4 μm or more and less than 6.6 μm, the friction between the magnetic tapes is small. Since the magnetic tape is small, the magnetic tape is easily displaced in the width direction, and even if a small amount of air remains between the tape roll and the newly wound magnetic tape, it causes a turbulence. When the traveling speed of the magnetic tape is as high as 10 to 12 m / s, the discharge of air between the tape roll and the newly wound magnetic tape cannot catch up, and air tends to remain between the magnetic tapes. However, according to the above-described configuration, the pressure roller has a peak or less in the contact pressure distribution in the width direction with respect to the tape roll, and thus has entered between the tape roll and the newly wound magnetic tape. The air is not confined by high contact pressures at a plurality of locations, and easily escapes to one or both of the width direction of the magnetic tape. For this reason, according to the magnetic tape take-up device of the present invention, the air between the magnetic tapes is well discharged, and the magnetic tape can be taken up at high speed and cleanly. Note that the contact pressure distribution between the pressure roller and the tape roll is a sheet-shaped pressure measurement sensor having a pressure measuring film whose color changes according to the contact pressure between the pressure roller and the tape roll or having a number of pressure sensors. Between the pressing roller and the tape roll. As the pressure measurement film, for example, “Play Scale (registered trademark)” manufactured by Fuji Film Co., Ltd. can be used, and the peak of the contact pressure can be visually confirmed from the color density.

  In the above-described apparatus, the pressing roller can be a crown roller. By using the crown roller, the contact pressure distribution can be made such that there is one peak near the center of the pressing roller. In this case, the crown roller may have a radius of curvature of the magnetic tape contact surface in a cross section passing through the rotation axis of 90 to 110 mm.

  In the above-described apparatus, the pressing roller can have a chamfered shape at at least one end in the width direction. Thus, since the pressing roller has a chamfered shape at the end in the width direction, even if the end contacts the tape roll, the contact pressure distribution cannot be peaked at the contact position. The chamfered shape may be, for example, a chamfered shape that is a shape in which corners are linearly dropped or a round chamfered shape that is a shape that is dropped into an arc shape.

  In the above-described apparatus, the pressing roller may be configured such that the width of the contact portion that contacts the magnetic tape is smaller than the width of the magnetic tape. In this case, the width of the contact portion is desirably 70% or more of the width of the magnetic tape, more desirably greater than 95%.

  In the above-described apparatus, the pressing roller can be configured to contact one end portion in the width direction of the magnetic tape and not to the other end portion with respect to the surface of the magnetic tape. According to such a configuration, at least one of the both end portions in the width direction of the magnetic tape is not pressed against the outer peripheral surface of the pressing roller, and the distribution of the contact pressure of the pressing roller with respect to the magnetic tape can be biased, so It becomes easy to discharge air in one direction.

  In the above-described apparatus, the pressing roller may be configured to contact the central portion in the width direction of the magnetic tape with respect to the surface of the magnetic tape and not to contact one end and the other end in the width direction. In this case, the air between the magnetic tapes can be easily discharged from the central portion in the width direction of the magnetic tape to the outside.

  In the above-described apparatus, the pressing roller may have an elastic layer on the magnetic tape contact surface.

  In the above-described apparatus, the pressing roller is supported by the swinging arm that can swing around the central axis of the guide surface of the entry direction regulating guide, and the swinging arm is urged toward the tape roll. It can be set as the structure provided with the urging member which urges | biases.

  According to such a configuration, since the swing arm can swing around the central axis of the guide surface of the approach direction regulation guide, the tension of the tape wound around the approach direction regulation guide is caused by the rotation of the swing arm. Does not work as a force. For this reason, since the urging force of the urging member transmitted to the pressing roller via the swing arm is stabilized, the magnetic tape can be wound well.

  According to the magnetic tape take-up device of the present invention, air can be discharged between the magnetic tapes, and the magnetic tape can be taken up at high speed and cleanly.

(A) is a block diagram of the tape winding apparatus which concerns on embodiment, (b) is an enlarged view of the approach position to the tape roll of a magnetic tape. It is a figure explaining operation | movement of the magnetic tape winding apparatus which concerns on embodiment, (a) is before winding thickening, (b) shows after winding thickening. It is an enlarged view (a) of a pressure roller and a magnetic tape when using a crown roller as the pressure roller of the first example, and a contact pressure distribution (b). It is an enlarged view (a) of the pressure roller and magnetic tape of a comparative example, and contact pressure distribution (b). They are an enlarged view (a) and a contact pressure distribution (b) of a pressure roller and a magnetic tape in the case of using a pressure roller having a chamfer at the end in the width direction as the pressure roller of the second example. They are an enlarged view (a) and a contact pressure distribution (b) of a pressing roller and a magnetic tape in the case of using a pressing roller having a round chamfer at the end in the width direction as the pressing roller of the second example. It is the figure after (a) winding thickening of the magnetic tape winding apparatus of a 1st modification, and (b) after winding thickening. It is the figure after (a) winding thickening of the magnetic tape winding apparatus of a 2nd modification, and (b) after winding thickening. It is the figure after (a) winding thickening of the magnetic tape winding apparatus of a 3rd modification, and (b) after winding thickening. It is a figure of the magnetic tape winding apparatus of a 4th modification. It is a table | surface which shows the test conditions of each Example. It is a table | surface which shows the test conditions of each comparative example.

Next, embodiments of the present invention will be described in detail with reference to the drawings as appropriate.
A magnetic tape take-up device 1 according to the first embodiment shown in FIG. 1A shows an example of a take-up side device in a tape running device of a servo writer that records a servo signal on a magnetic tape MT. . The magnetic tape winding device 1 is configured by disposing each device on a base 10 made of a metal plate or the like. The magnetic tape winding device 1 mainly includes a spindle 11, an entrance-side pressing roller unit 20, an air bleeding pressing roller unit 30, optical sensors 41 and 42, and a control device 40.

  Here, the magnetic tape MT taken up by the magnetic tape take-up device 1 has a width of 12.644 to 12.656 mm (so-called 1/2 inch (12.65 mm) width). The arithmetic average roughness Ra of the surface on the magnetic layer side of the magnetic tape MT is less than 4 nm, preferably 3 nm or less. The arithmetic average roughness Ra of the surface on the back layer side opposite to the magnetic layer is 20 nm or less. The thickness of the magnetic tape MT is not less than 4 μm and less than 6.6 μm, and preferably not more than 5.5 μm. As the width of the magnetic tape MT is narrower and the surface roughness is smaller, the frictional force between the magnetic tape MT wound around the tape roll TR and the tape roll TR becomes smaller, and the magnetic tape MT tends to shift in the width direction.

  Here, the arithmetic average roughness Ra can be measured according to ECMA-319 9.11, for example, using NanoScope III AFM (manufactured by Digital Instruments) as a measuring device. Further, the thickness of the magnetic tape can be calculated in accordance with ECMA-319 9.4.1 by stacking a plurality of magnetic tapes.

  The spindle 11 has a winding core 12 around which a magnetic tape MT, which is an example of a tape, is wound, and is rotated by a motor 13 as an example of a rotating device. Note that the rotation of the motor 13 is controlled by the control device 40. The control device 40 controls the traveling speed (winding speed) of the magnetic tape MT at an appropriate speed within a range of 10 to 12 m / s when the speed is stabilized.

  The entry side pressure roller unit 20 includes a pressure roller 21, an entry direction restriction guide 22, a swing arm 23, a slide stage 24, a rail 25, a spring 26, a drive belt 27, a motor 28, and a width direction position restriction guide 29. The swing arm 23, the slide stage 24, the rail 25, the drive belt 27, and the motor 28 are examples of the moving device.

  The pressing roller 21 is a roller having a urethane rubber layer as an example of an elastic layer on the magnetic tape contact surface, and is rotatably supported by the swing arm 23. At the position where the magnetic tape MT enters the tape roll TR (referred to as “tape entry position P”), the outer circumferential surface of the pressing roller 21 abuts on the outer circumferential surface of the tape roll TR and rolls. By the pressing force of the pressing roller 21, the air between the tape roll TR and the magnetic tape MT entering the tape roll TR is gradually removed, and the width direction of the magnetic tape MT newly wound around the tape roll TR The position of is roughly defined.

  The pressing roller 21 preferably has a hardness of 60 degrees or less, and when urethane rubber is used, it is preferable to use a roller having a hardness of 40 degrees or more in order to suppress sticking to the magnetic tape MT. When the pressure roller 21 has a lower hardness, the air can be loosened smoothly between the outermost magnetic tape MT and the inner tape roll TR, and the magnetic tape MT is wound with a good winding shape. It is possible. The hardness here can be measured with a measuring instrument (durometer) according to JIS K 6253.

The diameter of the pressing roller 21 is preferably about 20 to 30 mm. The pressing force of the pressing roller 21 to the tape roll TR is, for example, 2.5 to 4N, and most preferably 3N. The pressing force here is, for example, when a spring is installed only in the direction of a straight line connecting the center O of the tape roll and the tape entry position P, and the pressing roller 21 is pulled by a spring balance. It can be measured as a load at the moment of leaving the tape roll TR.
Details of the shape and the like of the pressing roller 21 will be described later.

  The approach direction regulation guide 22 is a roller that regulates the traveling direction of the magnetic tape MT entering the tape entry position P. The approach direction restriction guide 22 is a tape guide roller disposed closest to the tape entry position P on the upstream side in the running direction of the magnetic tape MT from the tape entry position P. The approach direction regulation guide 22 is rotatably supported by the slide stage 24.

  As shown in FIG. 1B, an angle θ formed by a straight line L1 perpendicular to the line segment connecting the center O of the tape roll TR and the tape entry position P and the magnetic tape MT immediately before entering the tape entry position P. Is adjusted by the control device 40 so as to be 0 ° as much as possible. This angle θ is desirably in the range of −5 to 5 °, and more desirably in the range of −5 to 0 °. When the angle θ is deviated in a minus direction from 0 °, that is, when the magnetic tape MT is deviated not to be wound around the pressing roller 21, the tension of the magnetic tape MT affects the pressing force of the pressing roller 21. Because there is no.

  The swing arm 23 is supported on the slide stage 24 so as to be swingable coaxially with the rotation center of the approach direction regulating guide 22. More specifically, the swing arm 23 is supported by the slide stage 24 so that the approach direction restriction guide 22 can swing coaxially with the central axis of the cylindrical surface that guides the magnetic tape MT. Thereby, even if the swing arm 23 swings, the positional relationship between the guide surface (cylindrical surface) of the approach direction restriction guide 22 and the pressing roller 21 supported by the swing arm 23 can be maintained in a predetermined relationship. it can.

  As shown in FIG. 1 (a), the swing arm 23 is provided with a spring locking portion 23a at the end opposite to the pressing roller 21 with the approach direction regulating guide 22 interposed therebetween, and the spring locking portion 23a. One end 26a of the spring 26 is hooked on the hook. The other end 26b of the spring 26 is hooked on a spring locking portion 24a provided on the slide stage 24, and the spring 26 always functions as a pulling spring, thereby urging the swing arm 23 counterclockwise in FIG. doing. The outer periphery of the pressing roller 21 is pressed against the outer periphery of the tape roll TR by the rotational force of the swing arm 23 by the spring 26.

  A detection piece 23b extending to the opposite side of the tape roll TR is provided at the end of the swing arm 23 where the pressing roller 21 is provided. The detection piece 23b is a member that shields light from the optical sensor 41 described later.

  As described above, the slide stage 24 supports the entry direction restriction guide 22, the swing arm 23, and the width direction position restriction guide 29, and is close to the horizontal direction in FIG. It is configured to be movable in the direction of separation.

  The rail 25 extends in the horizontal direction in FIG. 1 and guides the slide stage 24 to translate in that direction.

The drive belt 27 forms part of a mechanism for moving the slide stage 24 in the horizontal direction in FIG. The drive belt 27 includes a belt 27a, a drive pulley 27b, and a driven pulley 27c. The belt 27a is stretched around the drive pulley 27b and the driven pulley 27c arranged in the horizontal direction in FIG. That is, the belt 27a is stretched in the horizontal direction. The above-mentioned slide stage 24 is fixed to the lower part of the tensioned belt 27a.
The driving pulley 27b receives the rotational driving force of the motor 28 and rotates the motor 28, so that the slide stage 24 moves in the horizontal direction, that is, in the direction of approaching / separating from the tape roll TR through the movement of the driving belt 27. It can be moved. As the motor 28, a stepping motor or a DC motor can be used.

The width direction position regulation guide 29 is a roller with a flange and is rotatably supported by the slide stage 24. The width direction position restricting guide 29 is below the approach direction restricting guide 22 in FIG. 1A, that is, on the outer periphery of the tape roll TR just before the outermost magnetic tape MT that has already been wound enters the tape entering position P. It is arranged at the corresponding position.
The width direction position regulation guide 29 is in contact with both sides in the width direction of the tape roll TR only at the flange portion, and the roller portion is not in contact with the outer periphery of the tape roll TR. Accordingly, the flange portion aligns the magnetic tape MT near the outer periphery in the width direction without applying a load to the magnetic tape MT wound around the tape roll TR.

  The optical sensor 41 includes a light emitting unit (not shown) and a light receiving unit that receives light emitted from the light emitting unit. The detection piece 23b described above enters between the light emitting unit and the light receiving unit, and the detection piece 23b is used. The posture of the swing arm 23 is detected based on the light shielding amount. A detection signal of the optical sensor 41 is output to the control device 40.

  The air bleeding pressure roller portion 30 is disposed on the opposite side of the entry side pressure roller portion 20 with the tape roll TR interposed therebetween. The air bleeding pressure roller unit 30 includes a second pressure roller 31, a swing arm 33, a slide stage 34, a rail 35, a spring 36, a drive belt 37, a motor 38, and a width direction position regulation guide 39.

  The second pressing roller 31 is a roller whose outer peripheral surface is made of urethane rubber similar to the pressing roller 21, and is rotatably supported by the swing arm 33. The second pressing roller 31 rolls with its outer peripheral surface in contact with the outer peripheral surface of the tape roll TR. By the pressing force of the second pressing roller 31, air between the outermost magnetic tape MT of the tape roll TR and the inner tape roll TR is excluded, and the position of the outermost magnetic tape MT of the tape roll TR is removed. Is now fixed.

  The swing arm 33 is supported so as to be swingable with respect to the slide stage 34. The swing arm 33 is provided with a spring locking portion 33a at the end opposite to the second pressing roller 31 across the swing center 33c, and one end 36a of the spring 36 is hooked on the spring locking portion 33a. ing. The other end 36b of the spring 36 is hooked on a spring locking portion 34a provided on the slide stage 34, and the spring 36 always functions as a pulling spring, thereby urging the swing arm 33 counterclockwise in FIG. doing. The outer periphery of the second pressing roller 31 is pressed against the outer periphery of the tape roll TR by the rotational force of the swing arm 33 by the spring 36.

  A detection piece 33b extending on the opposite side of the tape roll TR is provided at the end of the swing arm 33 where the second pressing roller 31 is provided. The detection piece 33b is a member that shields light from the optical sensor 42.

  The slide stage 34 supports the swing arm 33 and the width direction position regulation guide 39 and is configured to be movable along the rail 35 in the horizontal direction in FIG. 1, that is, in the direction approaching / separating from the tape roll TR. Yes.

  The rail 35 extends in the horizontal direction in FIG. 1 and guides the slide stage 34 to translate in that direction.

The drive belt 37 forms part of a mechanism for moving the slide stage 34 in the horizontal direction in FIG. The drive belt 37 includes a belt 37a, a drive pulley 37b, and a driven pulley 37c. The belt 37a is stretched around the drive pulley 37b and the driven pulley 37c arranged in the horizontal direction in FIG. That is, the belt 37a is stretched in the horizontal direction. The above-described slide stage 34 is fixed to the upper portion of the stretched belt 37a.
The driving pulley 37b receives the rotational driving force of the motor 38 and rotates the motor 38 so that the slide stage 34 moves in the horizontal direction, that is, in the direction of approaching / separating from the tape roll TR through the movement of the driving belt 37. It can be moved.

  The width direction position regulation guide 39 is a roller with a flange and is rotatably supported by the slide stage 34. Since the function is the same as that of the width direction position regulation guide 29 described above, detailed description thereof is omitted.

  The optical sensor 42 has the same function as the optical sensor 41 described above, and the detection piece 33b described above enters between the light emitting portion and the light receiving portion, and detects the posture of the swing arm 33 based on the amount of light blocked by the detection piece 33b. . A detection signal of the optical sensor 42 is output to the control device 40.

  The control device 40 receives the detection results of the optical sensors 41 and 42, and gradually moves the pressing roller 21 and the second pressing roller 31 outward in the radial direction of the tape roll TR according to the winding thickness of the tape roll TR. Control. Further, the rotational speed of the motor that rotates the spindle 11 is controlled, and the tension of the magnetic tape MT and the servo signal to be written on the magnetic tape MT are output to a servo signal writing head (not shown).

  Here, only control of the pressing roller 21 and the second pressing roller 31 will be described. The control device 40 outputs drive signals to the motors 28 and 38 so that the input signals from the optical sensors 41 and 42 have a predetermined value stored in advance. For example, when the tape roller TR is wound thickly, the pressing roller 21 rotates clockwise, and the detection piece 23b blocks a large amount of light from the optical sensor 41. In FIG. 1, the drive pulley 27b is rotated counterclockwise. The belt 27a is rotated by rotating a predetermined amount, and the slide stage 24 is moved away from the tape roll TR. Thereby, the swing arm 23 rotates counterclockwise, and the posture of the swing arm 23 can be kept constant.

[Operation of magnetic tape take-up device]
The operation of the magnetic tape take-up device 1 configured as described above will be described.
The magnetic tape MT supplied from a tape roll (not shown) on the supply side of the magnetic tape MT is guided by a plurality of guide rollers G (one shown in FIG. 1A), and a servo signal writing head. A servo signal is recorded by (not shown) and enters the tape roll TR on the winding side. Here, the magnetic tape MT is wound around the approach direction regulating guide 22 downstream of the guide roller G shown in FIG. 1A, and the traveling direction is changed upward in FIG. Drive towards. At this time, the magnetic tape MT advances along the tangential direction of the tape roll TR at the tape entry position P. Then, the tape enters the tape entry position P and is wound around the outer periphery of the tape roll TR.

  At the tape entry position P, the magnetic tape MT is pressed toward the tape roll TR by the pressing roller 21, and air between the tape roll TR and the outermost magnetic tape MT is excluded to some extent. The magnetic tape MT wound around the outermost periphery of the tape roll TR rotates while rotating on the tape roll TR counterclockwise in FIG. The position in the tape width direction is aligned with the inner tape roll TR by the flange. Immediately after that, the second pressing roller 31 presses the outermost magnetic tape MT against the tape roll TR, so that air between the outermost magnetic tape MT and the inner tape roll TR is further excluded, and the outermost magnetic tape MT is removed. The position of the magnetic tape MT is more stable.

  The outermost magnetic tape MT further makes a half-counterclockwise turn on the tape roll TR, the position in the width direction is regulated by the width-direction position regulation guide 29 immediately before the tape entry position P, and the inner tape roll Aligned with TR. In this way, the magnetic tape MT is wound while the position in the width direction is aligned with the tape roll TR.

  When the tape roll TR becomes thicker as shown in FIG. 2 (b) from the state shown in FIG. 2 (a), the position of the pressing roller 21 moves outward in the radial direction of the tape roll TR. The light shielding amount of the light emitted from the optical sensor 41 by the detection piece 23b changes. The control device 40 acquires the amount of light received from the optical sensor 41 and controls the rotation of the motor 28 so that the amount of received light is constant. As a result, the pressing roller 21 moves outward in the radial direction of the tape roll TR while the swing arm 23 maintains the same posture.

  Although not shown in FIGS. 2 (a) and 2 (b), the second pressing roller 31 also includes an optical sensor 42 based on the detection piece 33b as the position of the second pressing roller 31 moves outward in the radial direction of the tape roll TR. The control device 40 controls the rotation of the motor 38 so that the amount of light received by the optical sensor 42 is constant. Thereby, the 2nd press roller 31 moves to the radial direction outer side of tape roll TR, with the rocking | fluctuating arm 33 maintaining the same attitude | position.

In the winding process, the magnetic tape MT entering the tape roll TR as described above is pressed toward the tape roll TR by the pressing roller 21 at the tape entry position P, and the magnetic tape MT and the tape roll inside thereof are pressed. Air between TR is excluded.
Here, as described above, the posture of the swing arm 23 is constant regardless of the thickness of the tape roll TR, so that the direction of the magnetic tape MT from the approach direction restriction guide 22 toward the tape entry position P is always set. It almost coincides with the tangential direction of the tape roll TR at the tape entry position P. In such a state, since the magnetic tape MT is not wound around the pressing roller 21, the tension of the magnetic tape MT and its variation do not affect the pressing roller 21. Therefore, the pressing force of the outermost magnetic tape MT to the tape roll TR by the pressing roller 21 is stabilized, and the magnetic tape MT can be wound up neatly. Further, even if the winding speed of the magnetic tape MT is increased, the tension of the magnetic tape MT and the fluctuation thereof do not affect the pressing roller 21, so that the winding can be performed at a higher speed than before.

  2A and FIG. 2B, the approach direction regulating guide 22 moves in the horizontal direction at the same height as the center O of the tape roll TR in FIG. Are in the same posture, the magnetic tape MT heading from the approach direction restriction guide 22 toward the tape entry position P is slightly deviated from the tangential direction of the tape roll TR at the tape entry position P. However, if this deviation is small, there is no problem because the tension of the magnetic tape MT does not substantially affect the pressing roller 21.

  If the magnetic tape MT heading from the entry direction regulation guide 22 toward the tape entry position P is to be exactly matched with the tangential direction of the tape roll TR at the tape entry position P, the outer diameter of the tape roll TR is set to an optical sensor or the like. The slide stage 24 may be moved so that the posture of the swing arm 23 is slightly changed according to the outer diameter of the tape roll TR. Note that the relationship between the outer diameter of the tape roll TR and the position of the slide stage 24 may be stored in advance as a table.

  In the magnetic tape take-up device 1 configured as described above, the pressing roller 21 is configured so that the peak in the contact pressure distribution in the width direction of the magnetic tape MT with respect to the tape roll TR is one or less. There are several examples of such a pressure roller 21, which will be described in turn below.

[First example of pressing roller]
As shown in FIG. 3A, the pressing roller 21 as a first example is a crown roller, and its outer peripheral surface 21A has a substantially arc shape in a cross section passing through the rotation axis. In the outer peripheral surface 21A, the magnetic tape contact surface, which is a portion in contact with the magnetic tape MT, preferably has a crown-shaped (arc-shaped) curvature radius of 90 to 110 mm, for example, 100 mm. The radius of curvature here can be measured by image processing measurement using a comparator (projector) or a microscope.

  When the pressing roller 21 is a crown roller, the contact width with respect to the tape roll TR is determined according to the radius of curvature of the crown shape, the hardness of the urethane rubber, and the pressing force, and the width WC of the contact portion that contacts the magnetic tape MT is The width WT of the magnetic tape MT is preferably 70% or more, more preferably greater than 90%, and preferably less than 100%. When the width WC of the contact portion is 70% or more of the width WT, more desirably greater than 95%, the air between the magnetic tapes MT can be sufficiently extruded, and less than 100%, that is, the width WC of the contact portion is By being smaller than the width WT of the magnetic tape MT, at least one of both end portions in the width direction of the magnetic tape MT is not pressed against the outer peripheral surface 21A of the pressing roller 21, and the end portion in the width direction of the magnetic tape MT is pressed by the pressing roller 21. It is suppressed that the peak of the contact pressure is formed by hitting.

  Further, it is desirable that the pressing roller 21 in the first example is located at the center of the crown shape, that is, the center of the largest diameter in the width direction of the magnetic tape MT (tape roll TR).

  In the case of the pressure roller 21 configured as described above, as shown in FIG. 3B, the contact pressure distribution has one peak at the center in the width direction, and the contact pressure gradually increases toward the both sides in the width direction. Get smaller. For this reason, the air between magnetic tape MT can be discharged | emitted equally to the width direction both sides. The pressing roller 21 of the first example may be brought into contact with a slight shift from the center in the width direction, instead of contacting so that the center of the crown shape is located at the center in the width direction of the magnetic tape MT.

  Here, a comparative example will be described. As shown in FIG. 4A, a pressing roller 521 in which the outer peripheral surface 521A has a constant diameter regardless of the position in the width direction and has a flat cross section. The pressure roller 521 has a width WR wider than the width WT of the magnetic tape MT, and the outer peripheral surface 521A contacts the entire width of the magnetic tape MT. In such a case, as shown in FIG. 4B, peaks of contact pressure occur at two locations corresponding to both ends of the magnetic tape MT. For this reason, the air between the magnetic tapes MT between the two peaks of the contact pressure is less likely to exit to the outside in the width direction, the air discharge is inhibited, and the magnetic tape MT is displaced in the width direction at the tape roll TR. It becomes a factor. However, according to the pressure roller 21, since the air is discharged between the magnetic tapes MT as described above, such a problem does not occur.

[Second Example of Pressing Roller]
As shown in FIG. 5A, the pressure roller 121 as the second example has an outer peripheral surface 121A that is flat in the width direction and a chamfered shape at both ends in the width direction. The corner chamfers 121B and 121C having the shape dropped are formed. The outer peripheral surface 121A of the pressing roller 121 contacts the left end in the width direction of the magnetic tape MT in FIG. 5A and does not contact the right end with respect to the surface of the magnetic tape MT. For this reason, the width WC of the contact portion where the pressing roller 121 contacts the magnetic tape MT is smaller than the width WT of the magnetic tape MT. The width WC of the contact portion is preferably 70% or more of the width WT, more desirably greater than 90%, and desirably less than 100%. When the width WC of the contact portion is 70% or more of the width WT, and more desirably greater than 95%, the air between the magnetic tapes MT can be sufficiently pushed out. At least one of both end portions in the width direction is not pressed by the outer peripheral surface 121A of the pressing roller 121, and the distribution of the contact pressure of the pressing roller 121 with respect to the magnetic tape MT is biased so that the air between the magnetic tapes MT is unidirectional. It becomes easy to discharge.

  Note that, in the outer peripheral surface 121A of FIG. 5A, the vicinity of the left corner chamfer 121C does not contact the magnetic tape MT, and therefore does not affect the winding performance of the magnetic tape MT. Therefore, the presence or absence of the chamfer 121C is arbitrary. The angle of the chamfers 121B and 121C in the example shown here is 45 ° with respect to the outer peripheral surface 121A.

  In the case of the pressure roller 121 configured as described above, the pressure roller 121 does not contact the center of the magnetic tape MT in the width direction evenly in the left-right direction, but in a biased manner, as shown in FIG. In addition, the contact pressure distribution increases on the side close to the chamfer 121B, and a peak occurs at the boundary between the chamfer 121 and the outer peripheral surface 121A, and no peak occurs at the left end of the magnetic tape MT. For this reason, the air between the magnetic tapes MT can be discharged | emitted toward the left side edge part from the right side edge part by the side of chamfering 121B.

  In the pressing roller 121 of the second example described above, a further round chamfering shape is further provided at the corner 121D of the boundary between the right end contacting the magnetic tape MT and the right corner chamfer 121B in the outer peripheral surface 121A. The contact pressure distribution can also be adjusted.

[Third example of pressing roller]
As shown in FIG. 6A, the pressure roller 221 as the third example has an outer peripheral surface 221A that is flat in the width direction and a chamfered shape at both ends in the width direction, and here, the corners are circular arcs. Round chamfers 221B and 221C having a shape dropped into the shape are formed. The outer peripheral surface 221A of the pressing roller 221 contacts the left end in the width direction of the magnetic tape MT in FIG. 6A and does not contact the right end with respect to the surface of the magnetic tape MT. For this reason, the width WC of the contact portion where the pressing roller 221 contacts the magnetic tape MT is smaller than the width WT of the magnetic tape MT. The width WC of the contact portion is preferably 70% or more of the width WT, more desirably greater than 90%, and desirably less than 100%. When the width WC of the contact portion is 70% or more of the width WT, and more desirably greater than 95%, the air between the magnetic tapes MT can be sufficiently pushed out. At least one of both end portions in the width direction is not pressed against the outer peripheral surface 221A of the pressing roller 221, and the distribution of the contact pressure of the pressing roller 221 with respect to the magnetic tape MT is biased so that the air between the magnetic tapes MT is unidirectional. It becomes easy to discharge.

  Note that, in the outer peripheral surface 221A of FIG. 6A, the vicinity of the left round chamfer 221C does not contact the magnetic tape MT, and therefore does not affect the winding performance of the magnetic tape MT. Therefore, the presence or absence of the round chamfer 221C is arbitrary.

  In the case of the pressure roller 221 configured as described above, the pressure roller 221 does not contact the center of the width direction of the magnetic tape MT evenly on the left and right sides, but contacts in a biased manner, as shown in FIG. Furthermore, the contact pressure distribution increases on the side close to the round chamfer 221B, and a peak occurs at the boundary between the round chamfer 221 and the outer peripheral surface 221A, and no peak occurs at the left end of the magnetic tape MT. Therefore, the air between the magnetic tapes MT can be discharged from the right end on the round chamfer 221B side toward the left end. In addition, when this contact pressure distribution is compared with FIG. 5B in the case of the pressing roller 121 of the second example, the peak of the contact pressure becomes gentle as much as the corner chamfer 121B is changed to the round chamfer 221B. For this reason, the burden on the magnetic tape MT can be reduced.

  In the above description, the first to third examples have been described as various forms of the pressing roller 21 pressed against the tape roll TR at the tape entry position P. However, the first to third examples have been described. Such press rollers 21, 121, and 221 can also be applied to the second press roller 31 at a position where the outermost magnetic tape MT is wound half a turn. According to this, the air discharge between the magnetic tapes MT can be further improved. In addition, when making it contact in the width direction like the pressing rollers 121 and 221 in the width direction, the pressing direction in the pressing roller 21 at the tape entry position P and the second pressing roller 31 are biased. It is better to reverse the direction. For example, if the pressing roller 21 is shifted toward the base 10 with respect to the magnetic tape MT, the second pressing roller 31 may be shifted toward the side away from the base 10 with respect to the magnetic tape MT. By doing in this way, the discharge | emission condition of the air between magnetic tape MT can be made uniform in the width direction, and tape roll TR can be made into a more beautiful roll shape.

  Next, a modified example in which the mechanism of the magnetic tape winding device is changed will be described below.

[First Modification of Magnetic Tape Winding Device]
As shown in FIG. 7A and FIG. 7B, the magnetic tape take-up device 1B according to the first modified example is such that the pressing roller 21 is outside from the center O of the tape roll TR along the radial direction. The rail 25, the pressing roller 21 and the like are arranged so as to move to the position. In this case, the magnetic tape MT from the approach direction regulating guide 22 toward the tape entry position P is moved to the tape entry position P with the posture of the swing arm 23 kept constant as in the example of FIG. Can be exactly matched to the tangential direction of the tape roll TR.

[Second Modification of Magnetic Tape Winding Device]
As shown in FIGS. 8A and 8B, the magnetic tape take-up device 1C according to the second modified example does not support the pressing roller 21 on the swing arm 23 but slides it on the slide stage 24. The movable support member 123 is supported. Specifically, a guide groove 123G extending in the horizontal direction is provided on the slide stage 24, and the support member 123 is slidably engaged with the guide groove 123G. The support member 123 is constantly urged to the left in the drawing by the compression spring 126, so that the pressing roller 21 is constantly pressed against the outer peripheral surface of the tape roll TR. The support member 123 includes a detection piece 123b, and the detection piece 123b is detected by the optical sensor 41.
Also with such a configuration, as shown in FIGS. 8A and 8B, the approach direction of the magnetic tape MT with respect to the tape roll TR is changed according to the winding thickness of the tape roll TR. It can be made to substantially coincide with the tangential direction.

[Third Modification of Magnetic Tape Winding Device]
In the above-described embodiment, the pressing roller 21 is supported by the swing arm 23 and the slide stage 24 is linearly moved in one direction. However, the swing arm 23 supporting the press roller 21 is linearly moved in this way. The swing arm 124 is supported by a long swing arm 124 that swings like the magnetic tape take-up device 1D shown in FIGS. 9A and 9B. May be configured to be controlled by the actuator 128. At this time, the outer diameter of the tape roll TR is measured by the optical sensor 141, the actuator 128 is driven according to the outer diameter, and the pressing roller 21 is driven from the line segment OP and the approach direction regulating guide 22 shown in FIG. The angle formed by the magnetic tape MT toward the head is maintained at a right angle regardless of the outer diameter of the tape roll TR. In such a configuration, if the swing center of the swing arm 23 is made to coincide with the center of the cylindrical surface of the approach direction regulating guide 22, the urging force of the pressing roller 21 by the spring 26 causes the tension of the magnetic tape MT and Since it is not affected by the fluctuation, the magnetic tape MT can be wound up at high speed and cleanly as in the above embodiment.

[Fourth Modification of Magnetic Tape Winding Device]
As shown in FIG. 10, the magnetic tape take-up device 1E according to the fourth modification has a configuration in which the approach direction regulation guide 322 is fixed without being moved. In the example of FIG. 10, the approach direction restriction guide 322 is a guide pin that does not rotate and is fixed. As shown in FIG. 10, when the diameter of the approach direction restriction guide 322 is small, the locus of the tape entry position P corresponding to the winding thickness of the tape roll TR is almost arcuate, so that the pressing roller 321 is moved around the swing arm 323. It is possible to achieve a simple configuration in which a rotational force is applied to the swing arm 323 by the spring 326.

[Other variations]
Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and can be appropriately modified and implemented without departing from the spirit of the present invention.
For example, in the above-described embodiment, the magnetic tape take-up device 1 used in the servo writer is taken as an example, but the magnetic tape take-up device of the present invention is also applied to a magnetic tape take-up device used in a magnetic tape drive. It is possible.

  In the embodiment, the roller is exemplified as the approach direction regulation guide. However, the approach direction regulation guide does not have to be a roller, and has only a fixed cylindrical surface as shown in FIG. Alternatively, the advancing direction of the tape may be guided in a state where air is blown out and floated from the guide surface.

Next, an example in which the effect of the magnetic tape winding device of the present invention has been confirmed will be described.
A magnetic tape winding test was performed using a servo writer including the magnetic tape winding device 1 illustrated with reference to FIG.

Test conditions are as shown in FIGS. Specifically, in Examples 1 and 2, the crown roller shown in FIG. 3A was used as the pressing roller. In Examples 3 and 4, the outer peripheral surface shown in FIG. 5A was flat in the width direction, and a square chamfered pressure roller having chamfers of 1 mm at both ends was used. As shown in FIG. 5A, the pressing roller is arranged so as to be biased toward one end of the magnetic tape, and the other end of the magnetic tape and the pressing roller are not in contact with each other.
In Comparative Examples 1 to 3 in which the arithmetic average roughness Ra of the magnetic layer surface is changed with respect to Examples 1 to 4, the outer peripheral surface of FIG. 4 (a) is flat in the width direction and is in contact with the entire width of the magnetic tape. A roller was used.
In each example and comparative example, the arithmetic average roughness Ra was measured using the measuring apparatus and conditions shown in Table 1 below.

When the magnetic tape was wound up under the above conditions, as shown in Table 1 below, in Examples 1 to 4, although the arithmetic average roughness Ra of the magnetic layer surface was 2 nm, it was 12 m / s. It was able to wind up with a good winding shape at a high tape running speed.
On the other hand, in the comparative example 1 in which the arithmetic average roughness Ra of the magnetic layer surface is 4 nm, the winding is wound in a good winding shape at any of the tape running speeds of 10 m / s, 12 m / s, and 16 m / s. However, as in Comparative Examples 2 and 3, when the arithmetic average roughness Ra on the surface of the magnetic layer was 3 nm or less, the magnetic tape dropped off frequently.
The relationship between the surface roughness Ra and the tape running speed is shown in Table 2 below.

DESCRIPTION OF SYMBOLS 1 Magnetic tape winding device 13 Motor 21 Pressing roller 21A Outer peripheral surface 22 Approaching direction control guide 23 Swing arm 24 Slide stage 27 Drive belt 28 Motor 40 Control device MT Magnetic tape P Tape entry position TR Tape roll

Claims (12)

A rotating device for rotating a winding core for winding the magnetic tape;
A pressing roller that rolls by being pressed against the outer periphery of the tape roll at a tape entry position where the magnetic tape enters the tape roll that is a wound magnetic tape;
An approach direction restriction guide that is disposed upstream of the pressing roller in the traveling direction of the magnetic tape and that defines the traveling direction of the magnetic tape that enters the pressing roller;
Movement for moving at least one of the pressing roller and the entering direction regulating guide so that the tangential direction of the tape roll at the tape entering position and the running direction of the magnetic tape entering toward the pressing roller coincide with each other. With the device,
The magnetic tape has a width of 12.644 to 12.656 mm, an arithmetic surface roughness Ra of the magnetic layer side surface of less than 4 nm, and an arithmetic average roughness Ra of the back layer side surface opposite to the magnetic layer of 20 nm or less. , The thickness is 4 μm or more and less than 6.6 μm,
The traveling speed of the magnetic tape is 10-12 m / s,
The magnetic tape take-up device, wherein the pressing roller is configured to have one or less peaks in the contact pressure distribution in the width direction with respect to the tape roll.   The magnetic tape winding device according to claim 1, wherein the pressing roller is a crown roller.   3. The magnetic tape winding device according to claim 2, wherein the crown roller has a radius of curvature of a magnetic tape contact surface in a cross section passing through the rotation axis of 90 to 110 mm.   The magnetic tape winding device according to any one of claims 1 to 3, wherein the pressing roller has a chamfered shape at least at one end portion in the width direction.   The magnetic tape winding device according to claim 4, wherein the chamfered shape is a square chamfer or a round chamfer.   The magnetic tape winding device according to any one of claims 1 to 5, wherein the pressing roller has a width of a contact portion that contacts the magnetic tape that is smaller than a width of the magnetic tape.   The magnetic tape winding device according to claim 6, wherein the width of the contact portion is 70% or more of the width of the magnetic tape.   The magnetic tape winding device according to claim 6, wherein the width of the contact portion is greater than 95% of the width of the magnetic tape.   9. The pressure roller according to claim 6, wherein the pressing roller is in contact with one end portion in the width direction of the magnetic tape and is not in contact with the other end portion with respect to the surface of the magnetic tape. The magnetic tape winder according to item.   The press roller is in contact with a central portion in the width direction of the magnetic tape with respect to the surface of the magnetic tape, and is not in contact with one end and the other end in the width direction. The magnetic tape winding device according to claim 7 or 8.   The magnetic tape winding device according to any one of claims 1 to 10, wherein the pressing roller has an elastic layer on a magnetic tape contact surface. The pressing roller is supported by a swinging arm that can swing around a central axis of a guide surface of the approaching direction regulation guide,
The tape according to any one of claims 1 to 11, further comprising a biasing member that biases the swing arm so that the pressing roller is biased toward the tape roll. Winding device.

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