JPH09315633A - Magnetic tape winding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the occurrence of puckering due to buckling in tape width direction, caused by tension applied to a magnetic tape continuously traveling and lower the occurrence of a product defect due to winding. SOLUTION: A touch roll 8 is attached to the tip of an arm 6 fitted onto a frame 2, the arm 6 is connected to an air cylinder 10, a first guide roll 16 is provided on the frame 2, and the frame 2 is connected to a feed screw 24 driven by a control motor 22. A magnetic tape 26 is wound on a winding spindle 30 via the touch roll 8, and the touch roll 8 contactingly presses the magnetic tape 26 of the winding spindle 30 at that time. The touch roll 8 is constituted of the center core metal part, and a rubber layer of coating the outer side of the core metal part, the core metal part and the rubber layer are constituted into crown and reverse-crown shapes respectively, and the first guide roll 16 is constituted into a metallic crown shape.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic tape winding device, and more particularly, to a winding device such as a coating machine, a calendar machine, a rewinder machine or the like for winding a raw tape without wrinkling. It is about.

[0002]

2. Description of the Related Art A roll of magnetic tape, that is, a width of 300
A winding device is used for winding a magnetic tape coated or surface-treated with a magnetic paint on the surface of a polyethylene terephthalate film or a polyethylene naphthalate film having a thickness of 1300 mm and a thickness of 4 to 20 microns. Conventionally, as this type of winding device, a magnetic tape wound on a guide roll is wound around a winding shaft while applying a constant tension, and the wound magnetic tape is made of a cylindrical rubber touch roll ( An apparatus configured to wind while contacting with a pressure roller is generally used. As another conventional device, there is known a device using a tenter roll in which a spiral groove is engraved in a guide roll for guiding a magnetic tape.

[0003]

As described above, since the magnetic tape is extremely thin in the unit of micron, in such a conventional winding device, the longitudinal direction of the tape is prevented so that the tape is not misaligned during winding. When tape tension is applied to
When this tension is applied to the tape in a direction perpendicular to this tension, that is, in the width direction, and the stress exceeds the widthwise buckling strength of the tape, vertical ridges are created on the tape on the guide rolls, and the tape is folded. There is a problem that wrinkles occur and defective magnetic tapes are produced.

In order to solve this, the tenter roll as described above is adopted as the guide roll, but if such a phenomenon of folding occurs on the touch roll, it cannot be dealt with, and the touch roll is wound. Groove rolls cannot be used because of the need to evenly press the tape, and a solution to the problem of wrinkling on the touch roll has been desired. The present invention has been made in view of the above points, and prevents the generation of wrinkles due to buckling in the tape width direction caused by the tension applied to a continuously running magnetic tape, and reduces the occurrence of product defects due to winding. Another object of the present invention is to provide a magnetic tape winding device.

[0005]

In order to achieve the above object, the present invention provides a winding shaft for a magnetic tape, and a frame driven by a control motor so as to move toward and away from the winding shaft. An arm swingably supported by the frame, a touch roll supported by the tip of the arm,
A first guide roll arranged immediately in front of the take-up shaft of the touch roll, an air cylinder connected to the arm for contacting the touch roll with the take-up shaft, and a swing amount of the arm detected In a magnetic tape winding device which detects a sensor and controls the control motor to retract the frame from the winding shaft according to the swing amount of the arm, the touch roll includes a core supported by the arm. The first guide roll is composed of a metal part and a rubber layer covering the core metal part and having a diameter that is gradually reduced from both ends to the central part. The first guide roll has a gradual diameter from the both ends to the central part. Is formed in an expanding crown shape.

According to the present invention, the magnetic tape is wound around the winding shaft under a predetermined tension, and the magnetic tape is wound around the winding shaft with a predetermined contact pressure by the air cylinder during the winding. Apply pressure against the tape. Magnetic tape
The rubber layer of the touch roll is pressed against the winding shaft while closely adhering to it, and both ends of the rubber layer are crushed and elastically deformed to become straight. It is pulled in the width direction and exhibits a tentering function. This prevents wrinkling due to buckling during winding of the magnetic tape.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on an embodiment shown in the drawings. FIG. 1 is a front view of an embodiment of the present invention, and FIG. 2 is a front view showing an operation during winding of a magnetic tape. In FIGS. 1 and 2, an arm 6 is swingably mounted on a frame 2 via a shaft 4, and a touch roll 8 is rotatably mounted on a tip of the arm 6. The arm 6 is connected to the piston rod 1001 of the air cylinder 10 attached to the frame 2,
A bracket 12 is fixed to the tip of the arm 6, and the position of the bracket 12 is detected by a detection sensor 14. Three guide rolls, that is, a first guide roll 16, a second guide roll 18, and a third guide roll 20 are provided on the frame 2.

A feed screw 24 such as a ball screw driven by a control motor 22 is screwed into a female screw (not shown) provided on the frame 2. Magnetic tape 2
6 is from the fourth guide roll 28 outside the frame 2 to the third,
It is hung on the second and first guide rolls 20, 18, 16 and wound on the winding shaft 30 via the touch roll 8 under a predetermined tension, and at this time, the arm 6 is moved by the air cylinder 10. The touch roll 8 presses the magnetic tape 26 wound around the winding shaft 30 via the pressure roller.

When the magnetic tape 26 is wound up, the diameter of the winding shaft 30 becomes large as shown in FIG. 2, so that the touch roll 8 tries to be pushed back toward the air cylinder 10, but the bracket 12 detects the sensor. The amount by which the touch roll 8 is pushed back by touching the touch roll 14, that is, the swing amount of the arm 6 is detected, and this detection signal is sent to the control motor 22.
Then, the ball screw 24 is rotated and the frame 2 is retracted by the amount pushed back. Therefore, the winding shaft 30
The relative positional relationship between the touch roll 8 and the guide rolls 16, 18 and 20 does not change even if the diameter of the touch roll 8 increases, and the touch roll 8 maintains the same posture with respect to the winding shaft 30 during the winding operation. While the magnetic tape 26 is wound, the pressure is applied.

Therefore, the winding angle θ1 of the magnetic tape 26 around the first guide roll 16 and the winding angle θ2 around the touch roll 8 are always maintained constant. Figure 1 above
The mechanism of FIG. 2 and FIG. 2 is a mechanism of a general magnetic tape winding device, and the present invention, as shown in FIG. 3 and FIG. The point is that it was done. 3 and 4, the direction is changed so that the magnetic tape 26 flows from top to bottom for the sake of explanation, but the mechanism is mechanically the same as in FIGS. 1 and 2.

FIG. 3 is a perspective view of a main part of the present invention, and FIG. 4 is a side view conceptually showing the main part of the present invention. In FIG.
The touch roll 8 includes a cored bar 801 at the center and a rubber layer 802 that covers the outside of the cored bar 801. The cored bar portion 801 is composed of a roll having a surface (hereinafter, this shape is referred to as a crown shape) whose diameter gradually increases from both ends to the center so that both ends have the smallest diameter and the center has the largest diameter. Both ends thereof are rotatably supported by the arm 6. The cored bar portion 801 is formed of an elongated metal material having elasticity so as to bend under a predetermined pressure.

The rubber layer 802 has a shape in which the diameter gradually decreases from both ends to the center so that both ends have the maximum diameter and the center has the minimum diameter (hereinafter, this shape is referred to as an inverted crown shape).
It is composed of a roll having a surface. The first guide roll 16 is made of a metal crown-shaped roll.

The operation of the above configuration will be described in detail below.
When the magnetic tape 26 is wound around the winding shaft 30 with a predetermined tension applied, and the touch roll 8 is pressed toward the winding shaft 30 by the air cylinder 10 at a predetermined contact pressure, the contact pressure causes the core to move. The gold portion 801 is curved and deformed, and
Since the rubber layer 802 has an inverted crown-shaped surface, both end portions of the rubber surface are the strongest and are likely to hit the magnetic tape 26 of the winding shaft 30. Originally, the contact pressure when the touch roll 8 contacts the magnetic tape 26 of the winding shaft 30 is preferably uniform over the entire length of the touch roll 8. This is because if there is a large difference in the distribution of the contact pressure, wrinkles are likely to occur when a soft material such as the magnetic tape 26 is wound.

Therefore, the cored bar 801 is formed into a crown-shaped roll, and the cored bar 801 is also curved and deformed. Due to the curved deformation of the gold portion 801, the pressing force at the central portion increases, and as a result, a uniform contact pressure is obtained over the entire length of the rubber layer 802.

Next, the width-reducing effect of using the rubber layer 802 of the touch roll 8 as an inverted crown roll will be described. The magnetic tape 26 is held in close contact with the touch roll 8 of the inverted crown-shaped roll at a predetermined angle θ2, but since the surface of the rubber layer 802 has the inverted crown shape,
In the initial stage of winding the magnetic tape 26, the magnetic tape 26 is in close contact with the rubber layer 802 along the curved surface.

On the other hand, since the touch roll 8 is pressed against the straight cylindrical winding shaft 30, the inverted crown-shaped rubber layer 802 is crushed at the portion contacting the winding shaft 30, that is, both ends. It is elastically deformed so that it becomes straight. As a result, the rubber in the crushed portion is deformed so that the rubber surface slightly expands in the width direction in an attempt to obtain escape areas at both ends. At this time, the magnetic tape 26
Since the rubber tape 802 and the surface of the rubber layer 802 are in close contact with each other, the magnetic tape 26 follows the shape change of the rubber surface, and the magnetic tape 26 is pulled in both end directions immediately before being wound on the winding shaft 30 to exert a width-width effect. To be done.

The magnetic tape 26 is in that state the winding shaft 30.
The surface of the rubber layer 802 is immediately regained in an inverted crown shape when separated from the surface of the wound magnetic tape 26 in order to be quickly released from the touch roll 8 in the width direction of the magnetic tape 26. Winding shaft 3 in the pulled state
It is rolled up to 0. As described above, if the magnetic tape 26 is made to be held by the touch roll 8 of the inverted crown type roll, another problem occurs. That is, since the central portion and the both end portions of the rubber layer 802 of the inverted crown-shaped roll have different diameters, a circumferential length difference occurs. It hits the rubber surface, and the central part comes into contact with the rubber surface later.

Therefore, the magnetic tape 26 is unevenly stretched in the width direction, which causes wrinkles on the magnetic tape 26, which may impair the width-reducing effect of the inverted crown-shaped touch roll 8. is there. In order to prevent this and to exert a sufficient width-out function, the first guide roll 16 of a crown-shaped roll is provided immediately before the touch roll 8. This causes, as shown in FIG.
Both ends of the small diameter of the first guide roll 16 are the touch roll 8
The large diameter central portion of the first guide roll 16 and the small diameter central portion of the touch roll 8 are respectively attached to both ends of the large diameter of the magnetic tape 2.
Since 6 is held, the difference in elongation of the magnetic tape 26 caused by the difference in circumferential length between the both ends and the center of the touch roll 8 can be offset.

As described above, according to the present embodiment, the touch roll 8 is constituted by the crown-shaped rubber roll, so that the touch roll 8 can be provided with the width-expanding function, and By constructing the immediately preceding first guide roll 26 with a crown-shaped roll,
It is possible to cancel the difference in elongation of the magnetic tape 26 caused by the difference in circumferential length between the both ends and the center of the crown-shaped touch roll 8, and thus it is possible to prevent wrinkles from being generated when the magnetic tape is wound.

[0020]

As described above in detail, according to the present invention, the winding shaft of the magnetic tape, the frame driven by the control motor so as to move toward and away from the winding shaft, and the frame swings. An arm movably supported, a touch roll supported by a tip portion of the arm, a first guide roll arranged immediately before the side opposite to the winding shaft of the touch roll, and connected to the arm. An air cylinder that presses the touch roll against the winding shaft, and a detection sensor that detects the swing amount of the arm to control the control motor to retract the frame from the winding shaft according to the swing amount of the arm. In the magnetic tape winding device configured as described above, the touch roll includes a cored bar portion supported by the arm and a reverse club that covers the cored bar portion and gradually reduces the diameter from both ends to the central part. It is composed of a rubber layer of the emission shape and the first guide roll is loosely diameter toward the center portion is formed in a crown shape to expand from both ends. Therefore, in the present invention, the reverse crown-shaped rubber touch roll can be provided with the width-expanding function, and the crown-shaped first guide roll can be used to separate the both ends and the center of the crown-shaped touch roll. The difference in elongation of the magnetic tape caused by the difference in circumference can be canceled out, and thus wrinkles at the time of winding the magnetic tape can be prevented. Therefore, the occurrence rate of defective products at the time of winding the magnetic tape can be reduced, and high-speed winding can be performed without wrinkles, which improves productivity.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is a front view showing an operation during winding of the magnetic tape.

FIG. 3 is a perspective view of a main part of the present invention.

FIG. 4 is a side view conceptually showing a main part of the present invention.

[Explanation of symbols]

2 ... frame, 6 ... arm, 8 ... touch roll,
801 ... core metal part, 802 ... rubber layer, 10 ... air cylinder, 14 ... detection sensor, 16 ... first guide roll, 18 ... second guide roll, 20 ... third guide roll, 22 ...... Control motor, 24 ...... Feed screw, 26 ...
… Magnetic tape, 30… Winding shaft.

Claims (3)

[Claims] 1. A winding shaft for a magnetic tape, a frame driven by a control motor so as to approach and separate from the winding shaft, an arm swingably supported by the frame, and the arm. Of the touch roll, a first guide roll arranged immediately before the side of the touch roll opposite to the winding shaft, and a pressure of the touch roll connected to the arm to the winding shaft. A magnetic tape winding device including an air cylinder, wherein the detection amount of rocking of the arm is detected by a detection sensor to control the control motor to separate the frame from the winding shaft according to the amount of rocking of the arm. The touch roll includes a cored bar supported by the arm and an inverted crown-shaped rubber layer that covers the cored bar and gradually reduces the diameter from both ends to the central part. Made is, the first guide roll is loosely diameter toward the center portion from both ends is formed in a crown shape to expand, magnetic tape winding apparatus according to claim. 2. The magnetic tape winding device according to claim 1, wherein the core metal portion of the touch roll is made of an elastically deformable metal and is formed in a crown shape in which the diameter gradually increases from both end portions to the central portion. . 3. The magnetic tape winding device according to claim 1, wherein the first guide roll is made of metal.