JP2005267699A - Tape tension controller - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tension controller with which output tension can be reduced while maintaining peeling tension and variation in tension is reduced. <P>SOLUTION: The tension controller comprises a capstan roller 5 which is arranged between the unwinding reel 2 and the take-up reel 3 of a magnetic tape 4 and which is rotatively driven by the contact of a magnetic tape 4 with its peripheral surface; a right chamber 6<SB>R</SB>which is arranged in the vicinity of the unwinding reel 2 side of the roller 5; a left chamber 6<SB>L</SB>which is arranged in the vicinity of the take-up reel 3 side; pushing rollers 9<SB>R</SB>and 9<SB>L</SB>which guides the magnetic tape 4 into the chamber 6<SB>R</SB>and 6<SB>L</SB>; and line sensors 17<SB>R</SB>and 17<SB>L</SB>which detects the position of the magnetic tape 4 within the chambers 6<SB>R</SB>and 6<SB>L</SB>. When negative pressure is applied within the chambers 6<SB>R</SB>and 6<SB>L</SB>to provide the tension to the magnetic tape 4, peeling tension of the chamber 6<SB>R</SB>side and output tension of the chamber 6<SB>L</SB>side are isolated by the contact resistance of the capstan roller 5 and are individually controlled, respectively. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a tape tension control device that introduces a tape between an unwinding unit and a winding unit into a vacuum chamber, and sucks the tape by a negative pressure in the vacuum chamber to apply a tension.

  In general, in the step of winding a tape cut into a predetermined width (for example, a magnetic tape) on a take-up reel, a tape tension control device is used to apply a predetermined tension to the running magnetic tape. It has been wound up in good condition.

  As this tape tension control device, a dancer system that conventionally has a dancer arm (tension arm), a spring, a potentiometer, etc., and adjusts the tape tension during winding by interposing the dancer arm in the middle of the tape running path, A chamber type apparatus is used in which a slack portion of the tape is inserted into a vacuum chamber, the tape is sucked by a negative pressure in the vacuum chamber, and tension is applied to the tape.

As a chamber type tape tension control device, for example, the one described in Patent Document 1 below has been proposed.
JP 7-122031 A

  The dancer-type tape tension control device has a problem in that the responsiveness is poor due to its own weight, and the dancer arm cannot follow the change in tape tension when winding the tape at a high speed.

  In recent years, in the situation where the thickness of the magnetic tape is becoming thinner, it is desired to take up at a low tension so as not to damage the tape. The above peeling tension is required.

  In this regard, the chamber-type tape tension control device has a drawback in that the tension on the winding side (output tension) cannot be lowered while maintaining the peeling tension because the tape is tensioned in one chamber. there were.

In addition, the tape tension control device described in Patent Document 1 is provided with an air leak groove having a different depth depending on the position in one chamber that introduces the tape and sucks it with a predetermined negative pressure, and the amount of leak through the groove. Although it is configured to control the tension, it has the following drawbacks.
(1) Since the chamber base is grooved, the amount of air leak (air consumption) is large and the tension fluctuation is large.
(2) Since the chamber base is provided with a groove, even a small position variation causes a large tension variation.
(3) When an air guide is employed as a guide roller for guiding the tape into the chamber, there is no air escape path, the amount of air entrained in the chamber increases, and tension fluctuations increase.
(4) Since the tension control program and the speed control program are related to each other, the program becomes complicated.
(5) Since the tension cannot be lowered below a certain value in order to ensure the peeling tension, the influence of edge damage and off-track cannot be minimized.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a tape tension control device capable of lowering the output tension while maintaining the peeling tension and reducing the variation in tension.

  The tape tension control device according to the present invention includes a roller that is disposed between a winding unit and a winding unit of the tape and is driven to rotate by contacting the tape with an outer peripheral surface, and the vicinity of the unwinding unit side of the roller. A first chamber provided in the roller, a second chamber provided in the vicinity of the winding portion of the roller, an introducing means for guiding the tape into the first and second chambers, and the first And a tension applying unit that sucks the tape in the second chamber and applies a predetermined tension to the tape, and a control unit that controls the tension applied to the tape.

  The bases of the first and second chambers are each configured to be flat.

  In addition, it has a detecting means for detecting the position of the tape in the first and second chambers, and controls the rotation of the roller so that the position of the tape detected by the detecting means becomes a predetermined position. It is characterized by doing.

  A first air guide disposed on the unwinding portion side of the first chamber for guiding the tape in a non-contact manner; and disposed on the winding portion side of the second chamber; A second air guide for guiding the tape in a non-contact manner, and air escape portions are formed in the first and second chambers near the first and second air guides, respectively. It is said.

  In the apparatus of the present invention, when the tape is run from the unwinding unit side to the winding unit side, the tape is in contact with the outer peripheral surface of the roller to be rotationally driven. The tension applied to the tape in the first chamber and the tension applied to the tape in the second chamber are cut off. Therefore, different tensions can be applied in the first chamber and in the second chamber. For example, the second tension on the winding unit side can be maintained while maintaining the peeling tension of the first chamber on the winding unit side. The output tension of the chamber can be lower than the peeling tension.

  In addition, since the bases of the first and second chambers are configured flat, the amount of air leak during suction of the tape in each chamber is small, and tension fluctuation is small.

(1) According to the present invention, when the tape travels from the unwinding part side to the winding part side, the tape is in contact with the outer peripheral surface of the roller that is rotationally driven, so that contact resistance occurs, and the contact Due to the resistance, the tension applied to the tape in the first chamber is separated from the tension applied to the tape in the second chamber. Therefore, different tensions can be applied in the first chamber and in the second chamber. For example, the second tension on the winding unit side can be maintained while maintaining the peeling tension of the first chamber on the winding unit side. The output tension of the chamber can be lower than the peeling tension.

  This makes it possible to keep the output tension of the tape on the take-up side (in the second chamber) low even when a high release tension is applied to the tape on the take-out side (in the first chamber) during high-speed running. In particular, the thin tape is not damaged, and the off-track adverse effect can be reduced.

  Furthermore, since there is no need to reduce the traveling speed, productivity is improved in a process of winding a cut tape, for example.

Also, the tape running speed and tension can be controlled separately, the two control programs can be made independent, and the control program is simplified.
(2) According to the invention described in claim 2, since the bases of the first and second chambers are formed flat, the amount of air leakage at the time of sucking the tape in each chamber is small, and the tension fluctuations Can be kept small.

In addition, a constant tension can be applied regardless of the position of the tape introduced into each chamber, and tension fluctuation due to a change in position can be suppressed to a small level.
(3) According to the third and fourth aspects of the present invention, since the position of the tape in the first and second chambers can be controlled, the position of the tape is controlled within a predetermined range to run the tape. Can be stabilized.
(4) According to the inventions described in the fifth, sixth, seventh, and eighth aspects, the air in the first and second air guides can escape to the outside. The amount is reduced, and tension fluctuation can be suppressed.

  Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are a front view and a perspective view, respectively, of an apparatus in which the present invention is applied to a process of winding a cut tape on a take-up reel in magnetic tape production.

  Reference numeral 1 denotes a base plate installed between the unwinding reel 2 of the unwinding part and the winding reel 3 of the winding part. A capstan roller 5 (roller) is disposed at the upper center of the base plate 1 and is driven to rotate while the magnetic tape 4 is in contact with the outer peripheral surface.

A right chamber 6 _R (first chamber) is provided on the base plate 1 near the unwinding reel 2 side of the capstan roller 5, and a left chamber 6 _L (first chamber) is provided on the base plate 1 near the take-up reel 3 side. 2 chambers).

An air guide 7 _R for guiding the magnetic tape 4 is provided at the end of the right chamber 6 _{R on} the take-up reel 2 side, and an air guide for guiding the magnetic tape 4 on the end of the left chamber 6 _{L on} the take-up reel 3 side. 7 _L is provided. The axis of the air guide 7R, 7 _L and the capstan roller 5 is disposed so each substantially the same horizontal line position as shown in FIG.

The tape paths of the air guides 7 _R and 7 _L are formed of a sintering agent, and as shown in FIG. 4, an air layer is formed between the magnetic tape 4 and the magnetic tape 4 in a non-contact manner by ejecting air. It is a guide.

Pushing rollers 9 _R and 9 _L for pushing the magnetic tape 4 are disposed in the chamber bases 8 _R and 8 _L (bases) of the chambers 6 _R and 6 _L above the capstan roller 5. .

The pushing rollers 9 _R and 9 _L have shaft end portions in grooves 10 _R and 10 _{L which} are vertically provided from the upper part of the chamber bases 8 _R and 8 _{L to} a portion slightly lower than the capstan roller 5. It is inserted and supported so that it can move along the grooves 10 _R and 10 _L.

A pair of side guides 11 _RR , 11 _RL , 11 _LR , 11 _LL and chamber plates 12 _R , 12 are provided on the chamber bases 8 _R , 8 _L from the air guides 7 _R , 7 _L down from the air guides 7 _R , 7 _L to a lower end. _L is attached, and these chamber bases 8 _R and 8 _L , side guides 11 _RR , 11 _RL , 11 _LR , 11 _LL and chamber plates 12 _R , 12 _L form a chamber suction chamber.

In the present embodiment, the chamber bases 8 _R and 8 _L in the portion forming the suction chamber are flat without any conventional air leak grooves.

13 _R and 13 _L are vacuum holes formed in the lower part of the chamber bases 8 _R and 8 _L , and are connected to an ejector (not shown) as a suction means for pulling the suction chamber of the chamber to a negative pressure. Yes.

14 _R and 14 _L are sensor holes formed in the lower part of the chamber bases 8 _R and 8 _L , and are connected to a negative pressure sensor (not shown) for measuring the pressure in the chamber.

15 _R, 15 _L is an auxiliary plate to assist in pushing the magnetic tape 4 to the suction chamber side of the chamber 6 _R, 6 _L by pushing the rollers 9 _R, 9 _L, as shown in FIG. 3, cap Stan roller 5, and the air guide 7 _R, 7 _L, surrounded by a chamber plate 12 _R, 12 _L, and in opposition to the chamber base 8 _R, 8 _L, roller pushing from the chamber base 8 _R, 8 _L It is provided in a part separated by a distance slightly longer than the axial thickness of 9 _R and 9 _L.

The lower ends of the auxiliary plates 15 _R and 15 _L are fixed to the end surfaces of the pair of side guides 11 _RR , 11 _RL , 11 _LR and 11 _LL as shown in FIG. It is formed in a shape bent toward the side away from 8 _R and 8 _L.

Between the side guides 11 _RR , 11 _LL on the side where the air guides 7 _R , 7 _L are provided and the air guides 7 _R , 7 _L , air escape portions 16 _R , 16 _L are formed with an interval of a predetermined width. The air escape portions 16 _R and 16 _L function to release air from the air guides 7 _R and 7 _L.

The pair of side guides 11 _RR , 11 _RL , 11 _LR , 11 _LL has long holes 18 _RR , 18 _RL , 18 _LR , 18 _LL for passing the rays of the line sensors 17 _R , 17 _L , and the long holes 18 Transparent side plates 19 _RR , 19 _RL , 19 _LR , and 19 _LL are provided to block _RR , 18 _RL , 18 _LR , and 18 _LL and prevent air from leaking.

The line sensors 17 _R and 17 _L are attached to sensor brackets 20 _R and 20 _L that are movably provided along the side guides 11 _RR , 11 _RL , 11 _LR , and 11 _LL .

The details of the side guides 11 _RR , 11 _RL , 11 _LR , 11 _LL are shown in FIGS. 5 and 6 (only 11 _RR is shown, but 11 _RL , 11 _LR , 11 _LL is the same).

In these figures, the center portion of the side guide _11RR facing the suction chamber side of the chamber (the surface facing the magnetic tape 4) X is cut out at a predetermined depth to form a recess Y, and after the notch site bored a long hole 18 _RR of the recess Y, attach the transparent side plates 19 _RR for closing the elongated hole 18 _RR.

  A plurality of grooves Z are formed at predetermined intervals on the surface X (the surface facing the magnetic tape 4 introduced into the suction chamber), as shown in FIG. 6, and this groove processing increases the contact area with the magnetic tape 4. It is reduced.

The line sensor 17 _R attached to the sensor bracket 20 _R provides a light beam emitted from the light projecting element provided on either side of the side guide 11 _RR or 11 _RL to the suction chamber side on the other side. The position of the magnetic tape 4 in the suction chamber is detected by detecting with the light receiving element.

The line sensor 17 _L attached to the sensor bracket 20 _L provides a light beam emitted from the light projecting element provided on either side of the side guide 11 _LR or 11 _LL to the suction chamber side on the other side. The position of the magnetic tape 4 in the suction chamber is detected by detecting with the light receiving element.

  The unwinding reel 2, the take-up reel 3, and the capstan roller 5 are each driven to rotate by a motor (not shown). The winding reference speed curve of this apparatus can be made by the rotation motor of the capstan roller 5.

  FIG. 7 shows a control block for controlling the tension applied to the magnetic tape 4 by suction in the apparatus configured as described above.

  In FIG. 7, reference numeral 31 denotes a setting unit that sets various conditions such as the winding length of the magnetic tape 4, the unwinding reel 2, the take-up reel 3, and the rotation speed, acceleration, and rotation amount of the capstan roller 5.

A negative pressure sensor 32 is connected to the sensor holes 14 _R and 14 _L of the two chambers 6 _R and 6 _L , and measures the pressure in each chamber.

33 is set by each detection signal of the line sensor 17 (17 _R , 17 _L ) and the negative pressure sensor 32 for detecting the position of the magnetic tape 4 in each suction chamber of the two chambers 6 _R , 6 _L and the setting unit 31. Depending on the various conditions, the pressures of the ejectors 34 _R and 34 _L that apply negative pressure to the suction chambers of the two chambers 6 _R and 6 _L are controlled, and the unwinding reel 2, take-up reel 3, capstan It is a control part which controls the rotational drive of the roller 5 or controls the pushing operation of the pushing rollers 9 _R and 9 _L in FIG.

Next, the operation of the apparatus configured as described above will be described with reference to FIGS. 1 to 7 and FIG. Figure 8 shows a state in each operation mode, which is the main part, the supply reel 2, the take-up reel 3, the magnetic tape 4, the capstan roller 5, the chamber 6 _R, 6 _L of the suction chamber, an air guide Only the line sensors 17 _R and 17 _L attached to 7 _R and 7 _L , the pushing rollers 9 _R and 9 _L , and the sensor brackets 20 _R and 20 _L are shown.

First, when an operation signal is input with the tape passed as shown in FIG. 1, the push rollers 9 _R and 9 _{L start} to descend, and the magnetic tape 4 is moved into the two chambers 6 _R and 6 _R as shown in FIG. Push into the upper side of each 6 _L suction chamber.

At this time, displacement of the magnetic tape 4 in the width direction is regulated by the auxiliary plates 15 _R and 15 _L , and the introduction of the chambers 6 _R and 6 _{L into} the respective suction chambers is assisted.

Next, as shown in FIG. 8B, the take-up reel 2 and the take-up reel 3 are rotated in the direction in which the magnetic tape 4 is placed in the suction chambers of the chambers 6 _R and 6 _L (in the direction of the arrows), respectively. 4 is slackened and introduced into the suction chambers of the chambers 6 _R and 6 _L.

Next, when the magnetic tape 4 is introduced to the installation positions of the line sensors 17 _R and 17 _L , the take-up reel 2, the take-up reel 3 and the capstan roller 5 are moved so that the magnetic tape 4 can run at a desired position. The rotation of the magnetic tape 4 is controlled in the direction indicated by the arrow in FIG. 8C, and negative pressure is applied to the suction chambers of the two chambers 6 _R and 6 _L by the ejectors 34 _R and 34 _L. A predetermined tension is applied to (the push rollers 9 _R and 9 _L are returned to the original positions shown in FIG. 1).

At this time, the tension applied to the magnetic tape 4 in the suction chamber of the right chamber 6 _R and the tension applied to the magnetic tape 4 in the suction chamber of the left chamber 6 _{L due to} the contact resistance between the magnetic tape 4 and the capstan roller 5. Is cut off. Therefore, the pressures of the ejectors 34 _R and 34 _L can be made different, and the output tension on the left chamber 6 _L side can be lowered below the peeling tension while the peeling tension on the right chamber 6 _R side is maintained.

The position of the magnetic tape 4 running in the respective suction chambers of the chambers 6 _R and 6 _L is determined by setting the positions of the sensor brackets 20 _R and 20 _{L to which} the line sensors 17 _R and 17 _L are attached as the side guides 11 _RR and 11 _RL. , 11 _LR , and 11 _LL can be easily changed.

The side guide _{11 RR, 11 RL, 11 LR} , 11 LL is not limited to the above-described embodiment, for example, may be constituted by a rectangular body made of a transparent material, in which case the elongated hole 18 _RR and The side plate 19 _RR that closes it is not necessary.

BRIEF DESCRIPTION OF THE DRAWINGS The block diagram showing the whole one embodiment of this invention. 1 is a perspective view of an embodiment of the present invention. The principal part perspective view of one embodiment of the present invention. Explanatory drawing which shows the air guide in one embodiment of this invention. The side guide in one example of an embodiment of the present invention is shown, (a) is a top view, (b) is a side view, (c) is a perspective view, (d) is an exploded perspective view. The side guide in one embodiment of this invention is represented, (a) is a top view, (b) is a principal part enlarged view. The control block diagram in one embodiment of this invention. Explanatory drawing which shows the mode of each part at the time of each operation mode in one embodiment of this invention.

Explanation of symbols

1 ... base plate, 2 ... unwinding reel, 3 ... the take-up reel, 4 ... magnetic tape, 5 ... capstan roller, 6 _R ... right chamber, 6 _L ... left the chamber, 7 _R, 7 _L ... air guide, 8 _R , 8 _L ... chamber base, 9 _R , 9 _L ... push-in roller, 11 _RR , 11 _RL , 11 _LR , 11 _LL ... side guide, 12 _R , 12 _L ... chamber plate, 13 _R , 13 _L ... vacuum hole, 14 _R , 14 _L : Sensor hole, 15 _R , 15 _L : Auxiliary plate, 16 _R , 16 _L : Air escape portion, 17 _R , 17 _L : Line sensor, 18 _RR , 18 _RL , 18 _LR , 18 _LL ... Slot , 19 _RR , 19 _RL , 19 _LR , 19 _LL ... side plate, 20 _R , 20 _L ... sensor bracket, 31 ... setting part, 32 ... negative pressure sensor, 33 ... control part, 34 _R , 34 _L ... ejector.

Claims (8)

A roller disposed between a winding portion and a winding portion of the tape, the roller being rotated by being brought into contact with the outer peripheral surface;
A first chamber provided in the vicinity of the unwinding portion of the roller;
A second chamber provided in the vicinity of the winding part of the roller;
Introducing means for guiding the tape into the first and second chambers;
Tension applying means for sucking the tape in the first and second chambers and applying a predetermined tension to the tape;
A tape tension control device comprising: control means for controlling tension applied to the tape.   2. The tape tension control apparatus according to claim 1, wherein the bases of the first and second chambers are each configured to be flat.   Having a detecting means for detecting the position of the tape in the first and second chambers, and controlling the rotational drive of the roller so that the position of the tape detected by the detecting means is a predetermined position. The tape tension control device according to claim 1.   Having a detecting means for detecting the position of the tape in the first and second chambers, and controlling the rotational drive of the roller so that the position of the tape detected by the detecting means is a predetermined position. The tape tension control device according to claim 2. A first air guide disposed on the unwinding portion side of the first chamber and guiding the tape in a non-contact manner; and disposed on the winding portion side of the second chamber; A second air guide for non-contact guidance,
2. The tape tension control device according to claim 1, wherein air escape portions are formed in the first and second chambers in the vicinity of the first and second air guides, respectively. A first air guide disposed on the unwinding portion side of the first chamber and guiding the tape in a non-contact manner; and disposed on the winding portion side of the second chamber; A second air guide for non-contact guidance,
3. The tape tension control device according to claim 2, wherein air escape portions are formed in the first and second chambers near the first and second air guides, respectively. A first air guide disposed on the unwinding portion side of the first chamber and guiding the tape in a non-contact manner; and disposed on the winding portion side of the second chamber; A second air guide for non-contact guidance,
4. The tape tension control device according to claim 3, wherein air escape portions are respectively formed in the first and second chambers near the first and second air guides. A first air guide disposed on the unwinding portion side of the first chamber and guiding the tape in a non-contact manner; and disposed on the winding portion side of the second chamber; A second air guide for non-contact guidance,
The tape tension control device according to claim 4, wherein air escape portions are respectively formed in the first and second chambers in the vicinity of the first and second air guides.

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