JP5388649B2 - Web traveling position regulating method, web conveying device, and web cutting device - Google Patents

Description

  The present invention relates to a web travel position regulating method, a web transport device, and a web cutting device, which are flexible long bodies such as magnetic tape.

  In order to prevent a lateral shift of the tape fed from the tape supply source, a technique using a roller having a crown-shaped peripheral surface is known. (For example, refer to Patent Document 1 and Non-Patent Document 1).

Japanese Utility Model Publication No. 5-49752

Hashimoto, T., [Basic Theory and Application of Web Handling], Processing Technology Study Group, April 10, 2008, p.55

  However, in the prior art as described above, in order to center the tape by the crown-shaped peripheral surface, it is necessary to grip the tape on the peripheral surface of the roller. For this reason, there is a limitation in the application of the conventional technology as described above, and another method and apparatus for regulating the position of the traveling web in the width direction have been desired.

  The present invention provides a web travel position regulating method and a web transport device capable of performing position regulation in the width direction of a traveling web without relying on a roller having a crown-shaped peripheral surface, and the web transport described above. An object of the present invention is to obtain a web cutting device to which the device is applied and which can regulate the position in the width direction of a plurality of webs traveling with a simple structure.

In the web travel position regulating method according to the first aspect of the present invention, the axial center of the roller is a circumferential surface having a concave shape having a small diameter with respect to the axial end, and viewed from a direction orthogonal to the axial direction of the roller. A web is wrapped around a curving surface having a curve having no inflection point, and the web is at least in the width direction of the web by interposing an air between the web and the web between the web and the web. In the central part, the running position in the width direction of the web is regulated by running while sliding in a non-contact state .

  In the web travel position regulating method according to the first aspect, the web is wound around the concave peripheral surface of the roller, and the web is traveled while sliding on the roller peripheral surface. Thereby, the web is guided to the central portion of the roller in the axial direction (web width direction), and the position in the width direction is regulated. As this mechanism, it is conceivable that the web that is not guided to the large-diameter portion having a large peripheral speed by sliding due to sliding is guided to the central portion in the axial direction of the roller that becomes the shortest path by the tension.

  Thus, in the web travel position regulation method according to the first aspect, it is possible to perform the position regulation in the width direction of the web that travels without relying on a roller whose peripheral surface is a crown shape.

According to a second aspect of the present invention, the web travel position regulating method is a circumferential surface having a concave shape in which the center in the axial direction of the roller has a small diameter with respect to the end in the axial direction, and viewed from a direction orthogonal to the axial direction of the roller. wound the web winding surface forming an arc, the web be to travel while sliding relative to the roller, it regulates the running position in the width direction of the web.
A web travel position regulating method according to a third aspect of the invention is the web travel position regulating method according to the first or second aspect, wherein when the web traveling speed is lower than a predetermined speed, the circumferential surface of the roller is By making the peripheral speed coincide with the predetermined speed, the roller is driven to rotate so that the peripheral speed of the peripheral surface of the roller is faster than the traveling speed of the web, thereby sliding the web with respect to the roller. When the web travel speed is equal to or higher than the predetermined speed, the peripheral speed of the peripheral surface of the roller is matched with the web travel speed.

In the web travel position regulating method according to the third aspect, the web traveling on the peripheral surface of the roller can be stably slid by forcibly rotating the roller. For this reason, the position restriction | limiting of the width direction of the running web can be performed much more favorably. This web travel position regulation method is particularly effective when the web travel speed is low (including a transient state such as during acceleration).
According to a fourth aspect of the present invention, there is provided the web travel position regulating method according to the third aspect, wherein the predetermined speed is determined by the web and the winding surface in a state where the web is stopped. The speed coincides with the peripheral speed of the peripheral surface of the roller that generates entrained air that is not in contact with the web in the center in the width direction.
The web travel position regulating method according to claim 5 is the web travel position regulating method according to any one of claims 1 to 4, wherein the web is in the width direction of the web on the winding surface. 0.006 ≦ ΔLrn ≦ 0.057 is satisfied, where ΔLrn is a peripheral length change rate obtained by dividing the peripheral length difference of the winding range by the width of the web.

A web transport device according to a sixth aspect of the present invention is provided in a web travel unit that travels a web in a longitudinal direction, and a travel path of the web by the web travel unit, and the center in the axial direction has a smaller diameter than the end in the axial direction. A winding surface having a curved surface that is a concave peripheral surface and has no inflection point when viewed from the direction orthogonal to the axial direction, and the roller around which the web is wound, to the web is the roller, wherein the entrained air between the winding surface and the web is interposed, the roller drive for rotating the roller at a rate that slid in a non-contact state at least the central portion in the width direction of the web Means.

In the web conveyance device according to claim 6 , the web is traveled by the web travel unit and the roller around which the web is wound by the roller driving unit is at a speed at which slip occurs between the roller peripheral surface and the web. Driven by rotation. As a result, the web travels while slipping between the circumferential surfaces of the rollers, so that the web is guided to the center in the width direction (web width) of the roller, and the position in the width direction is regulated. As this mechanism, it is conceivable that the web that is not guided to the large-diameter portion having a large peripheral speed by sliding due to sliding is guided to the central portion in the axial direction of the roller that becomes the shortest path by the tension.

As described above, in the web conveyance device according to the sixth aspect, the position of the traveling web in the width direction can be regulated without relying on a roller whose peripheral surface is a crown shape.

The web conveying device according to the invention described in claim 7 is provided in a web traveling portion that causes the web to travel in the longitudinal direction, and a travel path of the web by the web traveling portion, and the center in the axial direction has a smaller diameter than the end in the axial direction. A concave circumferential surface having a winding surface that forms an arc when viewed from a direction orthogonal to the axial direction, a roller on which the web is wound on the surface forming the arc, and the web with respect to the roller a roller driving means for rotationally driving the roller at a rate which results in a slip, that features.
According to an eighth aspect of the present invention, there is provided the web conveying device according to the sixth or seventh aspect, wherein the roller driving means is configured to rotate the roller around at least when the web traveling speed is less than a predetermined speed. Rotate the roller so that the peripheral speed of the surface matches the predetermined speed and the peripheral speed of the peripheral surface of the roller matches the traveling speed of the web when the traveling speed of the web is equal to or higher than the predetermined speed. It is configured to drive.

In the web conveyance device according to claim 8 , the peripheral surface of the roller and the web can be securely (roller) by making the roller circumferential speed faster than the web traveling speed at least when the web traveling speed is less than a predetermined speed. When the peripheral speed is slower than the traveling speed of the web and compared with the case where the circumferential speed is the same as the traveling speed of the web which is less than the predetermined speed, the sliding can be performed stably. For this reason, the position restriction | limiting of the width direction of the running web can be performed much more favorably. The control of the web conveyance device is effective particularly when the web traveling speed is low (including a transient state such as during acceleration). The predetermined speed can be set as the lower limit (near) speed at which slip occurs between the web and the roller even if the web traveling speed and the roller circumferential speed are the same.
The web conveyance device according to the invention according to claim 9 is the web conveyance device according to claim 8, wherein the predetermined speed is a width of the web between the web and the winding surface when the web is stopped. The speed coincides with the peripheral speed of the peripheral surface of the roller that generates entrained air that is non-contact at the center of the direction.
The web conveyance device according to the invention described in claim 10 is the web conveyance device according to any one of claims 6 to 9, wherein the web is wound in the width direction of the web on the winding surface. When the circumferential length change rate obtained by dividing the circumferential length difference by ΔLrn is ΔLrn, 0.006 ≦ ΔLrn ≦ 0.057 is satisfied.

A web cutting device according to an eleventh aspect of the present invention is an unwinding unit for unwinding a web web, a cutting unit for dividing the web web into a plurality of webs by dividing the web web in a width direction, and the cutting The web web is unwound from the unwinding portion by the winding portion for coaxially winding at least two of the webs formed by cutting at the portion and the web running portion. The web conveyance device according to any one of claims 6 to 10 , which is applied so that the winding unit winds the web, and the roller constituting the web conveyance device includes: The winding surfaces, which are a plurality of concave peripheral surfaces on which at least two or more webs wound around the winding portion are independently wound , are arranged in parallel in the axial direction. .

In the web cutting device according to claim 11 , the web web is unwound from the unwinding unit by the web running unit, and at least two of the plurality of webs cut by the cutting unit are wound on the winding unit. . The at least two webs travel while being wound around the respective concave peripheral surfaces formed on the rollers, and are guided to the center part in the axis line (web width) direction on each of the wound peripheral surfaces. The position of is regulated.

Thus, in the web cutting device according to the eleventh aspect, it is possible to regulate the position of the traveling web in the width direction without relying on a roller whose peripheral surface is a crown shape. Further, in this web cutting apparatus, since the web slides on the circumferential surface of the roller, even if there is a difference in length between the two or more webs, these webs run independently and are wound by the winding unit. Can be made.
The web cutting device according to a twelfth aspect of the present invention is the web cutting device according to the eleventh aspect, wherein the roller constituting the web conveying device includes a roller portion on which a plurality of the winding surfaces are formed, and the roller. The roller portion and the support shaft portion are integrally configured so as to rotate coaxially and integrally with each other.

  As described above, the web travel position regulation method and the web conveyance device according to the present invention are excellent in that the travel direction of the web in the width direction can be regulated without relying on a roller whose peripheral surface is a crown shape. It has the effect. In addition, the web cutting device according to the present invention has the excellent effect that the web conveying device is applied, and position control in the width direction of a plurality of webs traveling with a simple structure can be performed.

It is a side view showing the schematic whole structure of the centering roller which constitutes the magnetic tape manufacturing device concerning the embodiment of the present invention. It is a side view which expands and schematically shows a part of centering roller which comprises the magnetic tape manufacturing apparatus which concerns on embodiment of this invention. It is a side view showing typically the outline whole composition of the magnetic tape manufacturing device concerning the embodiment of the present invention. It is a top view which shows typically the slitter which comprises the magnetic tape manufacturing apparatus which concerns on embodiment of this invention. It is a diagram which shows the centering effect by the centering roller which comprises the magnetic tape manufacturing apparatus which concerns on embodiment of this invention, comparing with a comparative example. FIG. 6 is a side view schematically showing a schematic configuration of an experimental apparatus for measuring the centering effect of FIG. 5. (A) is a diagram showing the tension fluctuation of the magnetic tape in the magnetic tape manufacturing apparatus according to the embodiment of the present invention, (B) is a diagram showing the tension fluctuation of the magnetic tape in the magnetic tape manufacturing apparatus according to the comparative example. It is. It is a figure for demonstrating the centering effect by the centering roller which concerns on embodiment of this invention, Comprising: It is a diagram which shows the relationship between the tension before and behind a roller in a tape stationary state, and this roller peripheral speed. It is a figure for demonstrating the centering effect by the centering roller which concerns on embodiment of this invention, Comprising: It is a diagram which shows the relationship between the tape floating amount with respect to the roller in a tape stationary state, and this roller peripheral speed. It is a figure for demonstrating the centering effect by the centering roller which concerns on embodiment of this invention, Comprising: The line which shows the relationship between the standard deviation of the relative displacement to the width direction of a tape with respect to the roller in a tape stationary state, and this roller peripheral speed FIG. It is a schematic diagram of the experimental apparatus for obtaining the diagrams of FIGS.

  A magnetic tape manufacturing apparatus 10 as a web cutting apparatus to which a web travel position regulating method and a web conveying apparatus according to an embodiment of the present invention are applied will be described with reference to FIGS. First, a schematic overall configuration of the magnetic tape manufacturing apparatus 10 will be described, and then the centering roller 38 which is a main part of the present invention will be described in detail.

(Magnetic tape manufacturing equipment)
FIG. 3 shows a part of the magnetic tape manufacturing apparatus 10 in a schematic side view. As shown in this figure, a magnetic tape manufacturing apparatus 10 is an apparatus for manufacturing a high-density magnetic recording tape 11 (hereinafter simply referred to as “magnetic tape 11”) as a web for computer backup, for example. A plurality of narrow magnetic tapes 11 are manufactured by cutting a wide magnetic tape original 12 as a web original along the longitudinal direction.

  Specifically, the original magnetic tape 12 has a band shape wider than the magnetic tape 11 as a product. For example, a magnetic layer containing ferromagnetic fine particles is applied to a nonmagnetic support by a coating method or the like. The magnetic layer is manufactured by performing an orientation treatment, a drying treatment, a surface treatment, etc. by forming by a vacuum deposition method or the like. The magnetic tape original fabric 12 is wound in a roll shape around a hub 14 as a winding core to form a magnetic tape original fabric roll 16 as a roll-shaped original fabric. The magnetic tape roll 16 is supported by a hub 14 so as to be rotatable about an axis, and constitutes an unwinding section (also referred to as an unwinding section) 15. Thereby, in the magnetic tape manufacturing apparatus 10, the continuous rewinding of the magnetic tape original fabric 12 from the magnetic tape original fabric roll 16 is enabled.

  The magnetic tape original fabric 12 is wound around a feed roller 18 as a web running portion which is also a reference roller, and by driving the feed roller 18, the magnetic tape original fabric 12 is continuously unwound from the magnetic tape original fabric roll 16 and sent out. It is supposed to be. On the downstream side of the feed roller 18, a slitter 20 is disposed as a cutting portion for cutting the original magnetic tape 12 at a plurality of positions in the width direction along the longitudinal direction.

  As shown in FIG. 4, the slitter 20 includes a plurality of pairs of rotating upper blades 22 and rotating lower blades 24 that are paired up and down and are juxtaposed in the width direction of the original magnetic tape 12. Each rotary upper blade 22 is rotationally driven by a motor 26, and each rotary lower blade 24 is rotationally driven by a motor 28.

  The raw magnetic tape 12 fed between a plurality of pairs of rotating upper blades 22 and rotating lower blades 24 constituting these slitters 20 is equally divided in the tape width direction to form a plurality of narrow magnetic tapes 11. Is formed. In this embodiment, the width Wt (see FIG. 2) of the magnetic tape 11 is approximately 12.65 [mm].

  Returning to FIG. 3, the magnetic tape 11 after being cut by the slitter 20 is wound around a pass roller 30 and then wound around a winding hub 32 that rotates in synchronization with the feed roller 18 to form a so-called pancake 34. It has become so. A plurality of pass rollers 30 and take-up hubs 32 (two each in this embodiment) are provided. Each of the two pass rollers 30 and the take-up hub 32 are alternately offset up and down in the width direction of the original magnetic tape 12, and the adjacent magnetic tapes 11 in the tape width direction are offset up and down from each other. The take-up hub 32 is wound up. In other words, the magnetic tape manufacturing apparatus 10 is configured such that the travel path of the magnetic tape 11 is branched into the upper travel path Wu and the lower travel path Wl downstream of the slitter 20.

  Further, the magnetic tape 12 or the magnetic tape 11 is wound between the magnetic tape roll 16 and the feed roller 18, between the feed roller 18 and the slitter 20, and between the slitter 20 and the upper and lower pass rollers 30. A hooked guide roller 36 is disposed as appropriate. Centering rollers 38 are respectively disposed between the guide roller 36 closest to the pass roller 30 and the upper and lower pass rollers 30. Each centering roller 38 has a winding surface 40 as will be described later, thereby restricting the position of the traveling magnetic tape 11 in the tape width direction.

  The magnetic tape 11 wound around the winding hub 32 is conveyed to a servo light device (not shown) as a pancake 34, and a servo signal is written while being rewound from the winding hub 32 in a servo process in the servo light device. After that, it is wound around a product reel.

(Configuration of centering roller)
The centering roller 38 as a roller in the present invention is a roller for restricting the traveling position of the magnetic tape 11 in the tape width direction, and thereby the centering function in the tape width direction with respect to the corresponding winding hub 32 of the magnetic tape 11. Has come to fulfill.

  As shown in FIG. 1, the centering roller 38 is formed with a plurality of (40 in this embodiment) winding surfaces 40 around which the magnetic tapes 11 traveling on the upper traveling path Wu or the lower traveling path Wl are wound. A roller portion 42 and a support shaft portion 44 provided at the shaft center portion of the roller portion 42. In this embodiment, the centering roller 38 is integrally configured (manufactured as a single product) such that the roller portion 42 (each winding surface 40) rotates coaxially and integrally with the support shaft portion 44.

  Each winding surface 40 of the centering roller 38 constituting the magnetic tape manufacturing apparatus 10 has a concave shape (concave shape) in which the center portion in the axis line (tape width) direction is recessed toward the rotation center with respect to both end portions. doing. Therefore, the centering roller 38 can be grasped as a so-called concave roller (a plurality of which are connected in the axial direction). In this embodiment, each winding surface 40 forms a curve (in this embodiment, an arc) having no inflection point when viewed from a direction orthogonal to the axis of the centering roller 38.

  More specifically, as shown in FIG. 2, each winding surface 40 has a radius difference ΔR between a minimum radius Rmin (≈40 mm) and a maximum radius Rmax, and ΔR = 0.2 mm. The width Wr in the axial direction of each winding surface 40 is approximately 25.3 mm, which is twice the width Wt of the magnetic tape 11. As described above, each winding surface 40 forms an arc when viewed from the direction orthogonal to the axis of the centering roller 38, and it can be seen that the radius of curvature r of this arc is approximately 400 mm from the ΔR and the width Wr.

  As shown in FIG. 2, when the magnetic tape 11 is wound around the winding surface 40 so that the center line in the tape width direction coincides, the minimum radius Rmin in the winding range of the magnetic tape 11 and the maximum winding The radius difference ΔRr with respect to the radius Rr is approximately 0.050 mm. In this embodiment, each magnetic tape 11 is wound around a corresponding winding surface 40 of the centering roller 38 in a range of approximately 90 ° (see FIG. 3), so that the tape tape width direction center portion and both end portions of the magnetic tape 11 The winding circumference difference ΔLr is approximately 0.078 mm. Further, the circumferential length change rate ΔLrn obtained by dividing the circumferential length difference ΔLr by the width Wt of the magnetic tape 11 to be dimensionless is approximately 0.006, and the depth of each winding surface 40 is determined by the circumferential length change rate ΔLrn. And the magnetic tape 11 are expressed (generalized).

  Further, each winding surface 40 is set to have extremely small irregularities so that slip easily occurs between the winding surfaces 40 and the traveling magnetic tape 11 (the friction coefficient is sufficiently small). Specifically, the surface roughness Ry of each winding surface 40 is 0.1 μm or less. In this embodiment, the surface roughness of the winding surface 40 is set by coating the surface of the roller portion 42 with diamond-like carbon (hereinafter referred to as “DLC”). In this embodiment, the surface roughness Ry of each winding surface 40 is 0.05 μm to 0.1 μm. The surface roughness Ry of the magnetic tape 11 wound around the winding surface 40 is sufficiently small with respect to 0.1 μm.

  As shown in FIGS. 1 and 3, the centering roller 38 constituting the magnetic tape manufacturing apparatus 10 is rotationally driven around the axis of the support shaft portion 44 by a roller driving mechanism 46 as a roller driving means. Yes. The roller drive mechanism 46 includes at least a variable speed motor.

  In the magnetic tape manufacturing apparatus 10, the roller driving mechanism 46 is configured such that the peripheral speed Vr on the winding surface 40 (the portion having the minimum radius Rmin) is always equal to or higher than the predetermined speed Vs (200 m / min in this embodiment). In addition, the rotation speed of the motor is controlled by the controller 48. Specifically, the roller drive mechanism 46 has a circumferential speed Vr of when the running speed Vt of the magnetic tape 11 running by the rotation of the feed roller 18 is lower than a predetermined speed Vs (including when the tape is stopped). When the running speed Vt of the magnetic tape 11 is approximately equal to the predetermined speed Vs and the running speed Vt is equal to or higher than the predetermined speed Vs, the controller 48 rotates the motor so that the peripheral speed Vr substantially matches the running speed Vt of the magnetic tape 11. The speed is controlled. The predetermined speed Vs is such that even when the magnetic tape 11 is stopped, air is drawn between the magnetic tape 11 and the winding surface 40 (hereinafter, this air is referred to as “entrained air”). The speed is set so that the tape 11 and the winding surface 40 are not in contact at least in the central portion in the width direction (details will be described later). The controller 48 obtains the traveling speed Vt from the rotational speed of the feed roller 18 that feeds the magnetic tape 11 without slipping, for example.

  As described above, in the magnetic tape manufacturing apparatus 10, the magnetic tape 11 travels almost completely with respect to the winding surface 40 of the centering roller 38 (in a non-contact state at least in the center in the width direction) regardless of the traveling speed. It is supposed to be. Thereby, in the magnetic tape manufacturing apparatus 10, the position of the magnetic tape 11 is regulated (centered) at the central portion of the winding surface 40 in the axis line (tape width) direction. The centering mechanism will be described later together with the operation of this embodiment.

  Next, the operation of this embodiment will be described.

  In the magnetic tape manufacturing apparatus 10 having the above-described configuration, when manufacturing a plurality of magnetic tapes 11 from the original magnetic tape 12, the feed roller 18 is activated and the magnetic material that has been rewound from the original magnetic tape roll 16 of the unwinding portion 15 is used. The original tape 12 is guided to the slitter 20. In the slitter 20, the magnetic tape original fabric 12 is equally divided in the width direction to form the magnetic tape 11. The plurality (80) of magnetic tapes 11 are alternately divided in the tape width direction into an upper travel path Wu and a lower travel path Wl, and a guide roller 36, a centering roller 38, and a pass roller 30 forming the respective travel paths. Is taken up by the take-up hub 32. As a result, a plurality of pancakes 34 having a predetermined width Wt are obtained from the wide original tape 12.

  When the magnetic tape 11 is manufactured, each centering roller 38 is rotationally driven by each roller driving mechanism 46 so that the circumferential speed Vr matches the predetermined speed Vs before the feed roller 18 starts to travel the magnetic tape 11. Has been. As a result, the entrained air is interposed between the winding surface 40 and the portion of the magnetic tape 11 wound around the winding surface 40, and the magnetic tape 11 is wound around immediately after the start of traveling. The vehicle travels while slipping (slipping) almost completely with respect to the hooking surface 40 (at least in the center in the width direction in a non-contact state). When the traveling speed Vt of the magnetic tape 11 is increased to be equal to or higher than the predetermined speed Vs, each centering roller 38 is rotated by each roller driving mechanism 46 so that the peripheral speed Vr matches the traveling speed Vt of the magnetic tape 11. Driven. As a result, entrained air is always present between the magnetic tape 11 and the winding surface 40, and the surface strength of the magnetic tape 11 and the winding surface 40 is 0.1 μm or less. The thickness of the entrained air layer with respect to the unevenness of the magnetic tape 11 is relatively increased and the friction between the magnetic tape 11 and the winding surface 40 is reduced, so that the magnetic tape 11 slides almost completely against the winding surface 40 as described above. While driving.

  As a result, in the magnetic tape manufacturing apparatus 10, the magnetic tape 11 is positioned (centered) in the center in the axial direction of the corresponding winding surface 40, and meandering and shaking associated with traveling are suppressed. This point will be supplemented based on the experimental results shown in FIG. The experimental results shown in FIG. 5 are the results obtained using the experimental apparatus 70 shown in FIG. The experimental apparatus 70 has a distance L2 (= 450 mm) from the centering roller 38 between the guide roller 36 and the centering roller 38 (or each modified example roller and each comparative example roller described later) arranged at a distance L1 (= 750 mm). ) Is provided with a tape pushing portion 72. The tape push-in portion 72 applies a forced displacement in the tape width direction (pushes in a predetermined amount) to the magnetic tape 11 running at that position. FIG. 5 shows the magnetic tape on the centering roller 38 (or a modified roller or a comparative example roller described later) when a forcible displacement amount X0 in the tape width direction applied to the magnetic tape 11 by the tape pushing portion 72 is given. 11 shows the results of measuring 11 running positions (offset amount in the tape width direction with respect to the center in the tape width direction) X1. The first comparative example roller is a crown roller whose winding surface has a crown shape and is generally used for centering applications, and the magnetic tape 11 is formed by forming a groove for releasing accompanying air on the winding surface. It is configured to be wound without slipping (the peripheral speed at the maximum diameter portion coincides with the traveling speed Vt of the magnetic tape 11). The second comparative example is a flat roller having a cylindrical winding surface, and a groove for escaping accompanying air is formed on the winding surface so that the magnetic tape 11 can be wound without slipping. ing.

  From FIG. 5, it can be seen that in the second comparative example roller, when the forced displacement X0 = 10 mm is applied, the offset amount X1 is 5 mm, and the centering effect due to friction with the magnetic tape is hardly seen. In the first comparative example, when the forced displacement X0 = 10 mm is applied, the offset amount X1 is 0.5 mm, and when the forced displacement X0 = 20 mm is applied, the offset amount X1 is 2 mm, and a predetermined centering effect is obtained. You can see that On the other hand, in this embodiment in which the magnetic tape 11 slides on the winding surface 40 of the centering roller 38, when the forced displacement X0 = 10 mm is applied to the comparative example roller, the offset amount X1 is 0 mm and the forced displacement X0 = 20 mm. In this case, the offset amount X1 is 1.5 mm, and it has been confirmed that the centering effect can be obtained even when a small displacement or a large displacement is applied. In addition, it was confirmed that the centering roller 38 has a good centering function with respect to the crown roller according to the first comparative example when either a small displacement or a large displacement is applied.

  Here, the mechanism of the centering action by the centering roller 38 will be supplemented. It is known that the above-described crown roller exhibits a centering action of the magnetic tape 11. This utilizes the property that when the magnetic tape 11 is integrally rotated while gripping the surface of the crown roller by friction, the magnetic tape 11 tends to approach the central portion in the tape width direction with the fastest peripheral speed. On the other hand, when the magnetic tape 11 slips on the winding surface 40, the property that the magnetic tape 11 tends to approach a portion with a high peripheral speed does not appear, and the magnetic tape 11 tries to travel on the shortest path by tension. Therefore, it is estimated that the position of the magnetic tape 11 is regulated at the central portion in the tape width direction, which is the smallest diameter portion on the winding surface 40.

  Here, in the magnetic tape manufacturing apparatus 10, since the magnetic tape 11 slips on each winding surface 40, the difference in length of the magnetic tape 11 conveyed in parallel does not matter. For example, in the configuration using the crown roller gripped by the magnetic tape 11 as described above, the plurality of crown rollers are supported by the support shaft portion 44 in order to absorb the difference in length (running speed Vt) of the plurality of magnetic tapes 11 arranged in parallel. Are rotatably provided through bearings. That is, a complex structure is required in which a plurality of crown rollers arranged in parallel in the axial direction are provided via bearings so as to be independently rotatable.

  On the other hand, in the magnetic tape manufacturing apparatus 10, since the magnetic tape 11 slips on each winding surface 40 as described above, a simple configuration in which each winding surface 40 rotates integrally (in this embodiment, the roller portion 42). In addition, the magnetic tape 11 having different lengths can be traveled (conveyed) at an independent travel speed Vt, while the centering function of the magnetic tape 11 is fulfilled by a single article in which the support shaft portion 44 is integrally formed.

  Furthermore, in the magnetic tape manufacturing apparatus 10, since no bearing is interposed between the roller portion 42 and the support shaft portion 44, the accuracy of the winding surface 40 is high (the amount of eccentricity is small). For this reason, in the magnetic tape manufacturing apparatus 10, the rotational fluctuation of the centering roller 38 and the tension fluctuation of the magnetic tape 11 due to the rotational fluctuation are remarkably suppressed as compared with the comparative example using the above-described bearing. Specifically, FIG. 7A shows the relationship (tension fluctuation) between the longitudinal position of the magnetic tape 11 and the tension between the centering roller 38 and the pass roller 30 in the tension fluctuation measuring unit 50 shown in FIG. As a result of measurement, it can be seen that the tension fluctuation is significantly suppressed as compared with the tension fluctuation of the comparative example shown in FIG. The longitudinal position of the magnetic tape 11 can be read as time if the running speed Vt is constant.

  Thus, since the magnetic tape manufacturing apparatus 10 employs a simple structure in which the magnetic tape 11 slips on each winding surface 40, the accuracy with respect to the rotation center of the winding surface 40 is high, and high deflection accuracy can be easily achieved. Can be realized. Thereby, in the magnetic tape manufacturing apparatus 10, the tension fluctuation | variation of the magnetic tape 11 and the bad influence on the tape quality resulting from this can be suppressed effectively.

  Further, in the magnetic tape manufacturing apparatus 10, when the traveling speed Vt of the magnetic tape 11 is lower than the predetermined speed Vs, the controller 48 is operated so that the peripheral speed Vr of the winding surface 40 substantially coincides with the predetermined speed Vs. 38 is rotated. For this reason, from the start of operation of the magnetic tape manufacturing apparatus 10 to its stop, the state in which the magnetic tape 11 is almost completely slid with respect to the winding surface 40 of each centering roller 38 can be maintained and the centering function can be achieved. . This point will be described with reference to FIGS.

  8 to 10 show experimental results by the experimental apparatus 80 shown in FIG. The experimental apparatus 80 in FIG. 11 winds the intermediate portion of the magnetic tape 11 with one end fixed around the winding surface 40 (ΔR = 0.2 mm) of the centering roller 38 and a predetermined tension T0 on the other end of the magnetic tape 11. The centering roller 38 is rotated while the magnetic tape 11 provided with (≈0.98N) is stationary, and the tension detectors 82 and 84 detect the flying height of the tension on the magnetic tape 11 before and after the centering roller 38. A device (distance sensor) 86 measures the flying height of the magnetic tape 11 with respect to the winding surface 40, and a meandering amount measuring device 88 measures the amount of meandering with respect to the winding surface 40 of the magnetic tape 11. FIG. 8 shows the relationship between the circumferential speed Vr of the winding surface 40 and the tension of the magnetic tape 11 (non-dimensionalized by the predetermined tension), and FIG. 10 shows the relationship of the flying height of the magnetic tape 11 with respect to the winding surface 40. FIG. 10 shows a standard deviation (each of the circumferential speed Vr of the winding surface 40 and the relative displacement of the magnetic tape 11 with respect to the winding surface 40 in the tape width direction. The relationship with the mean meandering amount obtained by averaging the meandering amount at the peripheral speed).

  From FIG. 8, the tension T1 on the front side of the centering roller 38 decreases as the peripheral speed Vr increases. When the peripheral speed Vr is 200 m / min (≈Vs) or higher, the tension T2 on the rear side of the centering roller 38 It can be seen that the difference between and becomes substantially constant. That is, when the peripheral speed Vr is 200 m / min, the influence of the friction (the drag torque) between the magnetic tape 11 and the winding surface 40 on the tension T1 is reduced, that is, the magnetic tape 11 is wound. It can be seen that it slides almost completely against 40. A slight difference between the tensions T1 and T2 is considered to be an influence of friction caused by the magnetic tape 11 coming into contact with the winding surface 40 at the end in the width direction. From FIG. 9, the flying height with respect to the winding surface 40 of the magnetic tape 11, that is, the thickness of the entrained air layer, increases as the peripheral speed Vr increases, and particularly when the peripheral speed Vr is 200 m / min (≈Vs) or more, 10 μm. It is understood that it exceeds. In this state, it is presumed that the magnetic tape 11 slips completely (non-contacting) with respect to the winding surface 40 at least in the center in the width direction. Furthermore, it can be seen from FIG. 10 that when the peripheral speed Vr is 200 m / min (≈Vs) or more, the amount of meandering with respect to the winding surface 40 of the magnetic tape 11 can be kept small.

  Thus, as shown in FIG. 8, by setting the circumferential speed Vr at which the tension T1 on the front side of the centering roller 38 converges to a predetermined value (which does not cause the influence of drag torque by the winding surface 40) as the predetermined speed Vs. As described above, regardless of the traveling speed Vt of the magnetic tape 11, the magnetic tape 11 can be made to slide almost completely with respect to the winding surface 40, and the magnetic tape manufacturing apparatus 10 starts up to a steady operation state. In the meantime, the function of centering the magnetic tape 11 satisfactorily can be achieved. In other words, by taking the data as shown in FIG. 8, it is possible to set an appropriate predetermined speed Vs according to the wrapping surface 40, the dimensional shape, surface strength, material, and the like of the magnetic tape 11. Further, this can be understood as being supported by the data in FIGS. 9 and 10.

  The entrained air drawn between the magnetic tape 11 and the winding surface 40 increases in proportion to the circumferential speed Vr of the winding surface 40 and also increases in proportion to the running speed Vt of the magnetic tape 11. Is increased in proportion to the sum of the peripheral speed Vr and the running speed Vt of the magnetic tape 11. For this reason, after the traveling speed Vt of the magnetic tape 11 reaches a constant speed (the predetermined speed Vs in this embodiment), if the peripheral speed Vr is the same as the traveling speed Vt of the magnetic tape 11, Even if the speed difference is not set, sufficient entrained air is drawn between the magnetic tape 11 and the winding surface 40, and the magnetic tape 11 is slid almost completely (non-contact) with respect to the winding surface 40. Can be maintained.

  In summary, in the method for regulating the position of the magnetic tape 11 using the centering roller 38 and the magnetic tape manufacturing apparatus 10 to which the method is applied, a better centering effect of the magnetic tape 11 can be obtained compared to the crown roller. . Further, in the method for regulating the position of the magnetic tape 11 using the centering roller 38 and the tape transport apparatus to which this is applied, a simple configuration in which no bearing is provided between the support shaft portion 44 and each winding surface 40 is provided. Thus, the length of each magnetic tape 11 can be absorbed, and the present invention is suitably applied to a magnetic tape manufacturing apparatus 10 that travels a plurality of magnetic tapes 11 having different lengths in parallel. Furthermore, in the method for regulating the position of the magnetic tape 11 using the centering roller 38, the tape transport apparatus to which the magnetic tape 11 is applied, and the magnetic tape manufacturing apparatus 10 to which these are applied, the centering roller 38 has a simple configuration as described above. High accuracy can be easily obtained, and rotational runout can be effectively suppressed.

  In the above-described embodiment, the example in which the radius difference ΔR corresponding to the depth (concave amount) of the winding surface 40 that is a concave surface is 0.2 mm is shown, but the present invention is not limited to this. As shown in FIG. 5, it is confirmed that a centering effect equal to or greater than that of the above embodiment can be obtained in each configuration (modified example) having at least ΔR of 0.2 mm, 0.5 mm, 1.0 mm, and 2.0 mm. It has been. Table 1 shows the radius of curvature r, radius difference ΔRr, circumference difference ΔLr, and circumference change rate ΔLrn of the arc of the winding surface 40 in each modification.

  The centering effect in each modification is equal to or greater than that of the above embodiment as shown in FIG. Therefore, the winding surface 40 of the centering roller 38 in the present invention is more generalized when the circumferential length difference ΔLr of the portion around which the predetermined width Wt magnetic tape 11 is wound is 0.078 mm or more. It has been confirmed that the centering effect is obtained when the peripheral length change rate ΔLrn in the width direction is 0.006 or more. It has been confirmed that when the radius difference ΔR, that is, the circumference difference ΔLr and the circumference change rate ΔLrn are increased, wrinkles are likely to occur in the traveling magnetic tape 11, and even if ΔR = 0.5 or more shown in FIG. Considering the result that there is no difference in the centering effect (the centering effects of the first to third modifications are equivalent), it is desirable that ΔR ≦ 1.0. In other words, 0.2 ≦ ΔR ≦ 1.0 is desirable, and 0.2 ≦ ΔR ≦ 0.5 is even more desirable.

  Further, in the above-described embodiment, the example in which the position regulation method of the magnetic tape 11 using the centering roller 38 and the tape transport device to which the centering roller 38 is applied is applied to the magnetic tape manufacturing apparatus 10 is shown. However, the present invention can be applied to various types of web conveyance devices. Therefore, for example, the present invention may be applied to a winding device that winds a single magnetic tape 11 on a product reel such as a tape cassette. For example, the present invention is applied to a web transport device other than a magnetic tape. Also good.

  Further, in the above-described embodiment, when the traveling speed Vt of the magnetic tape 11 is lower than the predetermined speed Vs, the circumferential speed Vr matches the predetermined speed Vs, and the traveling speed Vt of the magnetic tape 11 is equal to or higher than the predetermined speed Vs. However, the present invention is not limited to this. For example, the traveling speed Vt of the magnetic tape 11 always keeps the predetermined speed Vs. When applied to a lower device, the centering roller 38 may be rotated at a constant speed at which the circumferential speed Vr substantially matches the predetermined speed Vs.

  Furthermore, in the above-described embodiment, an example in which the surface roughness Ry of the winding surface 40 is 0.1 μm or less is shown, but the present invention is not limited to this, and for example, the peripheral speed Vr of the winding surface 40 And the surface roughness Ry may be appropriately set according to the web being traveled. In addition, the present invention is not limited to the configuration in which the winding surface 40 is smoothed (reduced friction) by the DLC coating, and the winding surface 40 can be smoothed by various surface treatments and machining.

10 Magnetic tape manufacturing equipment (web transport equipment, web cutting equipment)
11 Magnetic tape (web)
12 Magnetic tape web (web web)
15 Unwinding section 18 Feed roller (web running section)
20 slitter (cutting part)
38 Centering roller (roller)
40 Wrap surface (concave surface)
46 Roller drive mechanism (roller drive means)

Claims (12)

The web is formed on a winding surface that forms a curved surface that has a concave shape in which the center in the axial direction of the roller has a concave shape with a small diameter with respect to the end in the axial direction, and has no inflection point when viewed from the direction orthogonal to the axial direction of the roller. Wrapping and running the web against the roller while interposing air between the winding surface and the web and sliding in a non-contact state at least in the center in the width direction of the web , A web travel position regulating method for regulating a travel position in a width direction of the web. A web is wound around a winding surface, which is a circumferential surface having a concave shape whose center in the axial direction of the roller has a small diameter with respect to the axial end, and forms an arc when viewed from a direction orthogonal to the axial direction of the roller. A web travel position regulating method for regulating a travel position in a width direction of the web by running while sliding on the roller . When the running speed of the web is lower than a predetermined speed, the circumferential speed of the peripheral surface of the roller is made equal to the predetermined speed, so that the peripheral speed of the peripheral surface of the roller becomes faster than the running speed of the web. By rotating the roller, the web is caused to run while sliding against the roller,
3. The web travel position regulating method according to claim 1, wherein when the web traveling speed is equal to or higher than the predetermined speed, the circumferential speed of the circumferential surface of the roller coincides with the web traveling speed.   The predetermined speed coincides with the peripheral speed of the peripheral surface of the roller that generates entrained air in which the web and the winding surface are not in contact with each other at the center in the width direction of the web while the web is stopped. The web travel position regulating method according to claim 3, wherein the web travel position is regulated.   0.006 ≦ ΔLrn, where ΔLrn is a rate of change in circumference obtained by dividing the circumference difference of the web in the width direction of the web on the winding surface by the width of the web. The web travel position regulating method according to claim 1, wherein ≦ 0.057 is satisfied. A web running section for running the web in the longitudinal direction;
A curve that is provided in the web travel path by the web travel unit and that has a concave peripheral surface whose center in the axial direction has a small diameter with respect to the end in the axial direction and has no inflection point when viewed from the direction orthogonal to the axial direction. And a roller around which the web is wound.
Roller relative to the web is the roller, wherein the entrained air between the winding surface and the web is interposed, for rotationally driving the roller at a rate that slid in a non-contact state at least the central portion in the width direction of the web Driving means;
A web conveyance device comprising: A web running section for running the web in the longitudinal direction;
A winding surface that is provided in a travel path of the web by the web travel unit and has a concave circumferential surface whose center in the axial direction is a small diameter with respect to the end in the axial direction and that forms an arc when viewed from a direction orthogonal to the axial direction. A roller on which the web is wound around a surface forming the arc;
Roller driving means for rotationally driving the roller at a speed causing slippage of the web with respect to the roller;
A web conveyance device comprising:   The roller driving means is configured such that at least the circumferential speed of the peripheral surface of the roller coincides with the predetermined speed when the traveling speed of the web is less than a predetermined speed, and when the traveling speed of the web is equal to or higher than the predetermined speed, The web conveyance device according to claim 6 or 7, wherein the roller is rotationally driven so that a circumferential speed of the circumferential surface of the roller coincides with a traveling speed of the web.   The predetermined speed coincides with the peripheral speed of the peripheral surface of the roller that generates entrained air in which the web and the winding surface are not in contact with each other at the center in the width direction of the web while the web is stopped. The web conveying device according to claim 8, wherein the web conveying device has a speed to perform.   0.006 ≦ ΔLrn, where ΔLrn is a rate of change in circumference obtained by dividing the circumference difference of the web in the width direction of the web on the winding surface by the width of the web. The web conveyance device according to any one of claims 6 to 9, wherein ≦ 0.057 is satisfied. An unwinding section for unwinding the web,
A cutting section that divides the web web in the width direction and cuts the web into a plurality of webs;
A winding unit for coaxially winding at least two of the webs formed by being cut by the cutting unit;
The said web running part is applied so that the said web original fabric may be unwound from the said unwinding part, and the said winding part may be wound up by the said winding part. A web transport device;
And the roller constituting the web conveying device is a winding surface that is a plurality of concave peripheral surfaces around which at least two or more webs wound around the winding portion are wound independently. Is a web cutting device that is arranged in parallel in the axial direction.   The roller constituting the web conveyance device includes a roller portion on which a plurality of the winding surfaces are formed, and a support shaft portion provided at a shaft center portion of the roller portion, and the roller portion and the support The web cutting device according to claim 11, wherein the shaft portion is integrally configured so as to rotate coaxially and integrally.

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