JPH05338876A - Continuous uncoiling device - Google Patents

Abstract

PURPOSE:To restrain a splice roller from bounding regardless of the diameters of first and second webs in a continuous uncoiling device which presses and sticks the splice roller driven by an air cylinder to the junction between the first and second webs so as to continuously uncoil the first and second webs. CONSTITUTION:In a continuous uncoiling device which presses and sticks a splice roller 6 driven by an air cylinder 5 to the junction between a first web 1 and second web 2 in order to join the first web 1 and second web 2 together and continuously uncoil them, a shock absorber 8 equipped with a check valve is provided along the direction in which it works to suppress rebounding of the splice roller 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a film, a tape,
The present invention relates to a continuous unwinding device that joins a plurality of webs and continuously unwinds when unwinding a web wound with paper or the like.

[0002]

2. Description of the Related Art In manufacturing a magnetic recording medium having a magnetic film coated on a base film, at least two webs of the base film are prepared so that the magnetic layer can be continuously coated on the base film. , A continuous unwinding device is used that joins them so that they can be unwound continuously.

FIG. 4 is a schematic configuration diagram of such a continuous unwinding device. In this continuous unwinding device, the film 1a unwound from the first web 1 runs in the direction of arrow A. When the detector (not shown) detects that the remaining amount of the first web 1 has become small, the second web having the adhesive 3 is rotated in the direction of arrow B. And the second
Of the first web 1 and the part of the web where the glue 3 is applied
And are joined as described below. That is, first, the solenoid valve 4 is activated to increase the air pressure of the air cylinder 5, the cylinder rod thereof is moved forward, and the rotary arm 10 is rotated in the direction of the arrow to move the splice roll 6 made of a rubber-like elastic body to the first web. The film unwound from both webs 1 and 2 is stuck and joined by pressing it against the joining portion of the first and second webs. Then cut the extra film,
The cores of the first web 1 and the attachment positions of the second web 2 are exchanged, and thereafter, the film is released from the second web 2 in the same manner as the film 1a was initially unwound from the first web 1. Unrolled.

Generally, high speed is required for joining the webs to enable continuous unwinding of the webs, but usually, the first web 1 and the second web 2 are joined together.
Bonding with is performed within a short time of about 0.2 seconds.

However, when the splice roll 6 is pressed against the joint between the first web 1 and the second web 2 in the continuous unwinding device shown in FIG. 4, the collision energy at that time causes the air cylinder 5 to spring. As a result, the splice roll 6 bounces and cannot hold the joint portion for a predetermined time. Therefore, when the timing of hitting the joint portion of the splice roll 6 deviates from the optimum time due to a change in the air pressure in the air cylinder 5, a change in the diameter of the second web 2, or the like, the first web 1 and the second web 2 can be stably There was a problem that it would not be possible to attach it to the web 2.

Therefore, as shown by the broken line in the figure, the shock absorber 7 is incorporated in the direction of action of the air cylinder 5, and before the splice roll hits the joint between the first web 1 and the second web 2, Air cylinder 5
It has been attempted to absorb the collision energy of the splice rolls 6 by absorbing the forward energy of the shock absorbers 7 by the shock absorber 7.

[0007]

However, when the shock absorber 7 is incorporated in the direction of action of the air cylinder 5, the speed at which the splice roll 6 hits the joint between the first web 1 and the second web 2 becomes slow, As a result, there is a problem that it cannot be adhered with high reliability, or that the request for high-speed bonding cannot be met.

Further, the diameter of the second web 2 is normally set so that the distance between the splice roll 6 and the joint is constant even if the diameter of the second web 2 to be joined changes. Is detected by the sensor, and the position of the splice roll 6 is adjusted based on that, but as a result, the stroke of the shock absorber 7 changes, so the bounce cycle time becomes longer, or the shock energy is not sufficiently absorbed by the shock absorber 7. There was a problem.

There is also a problem that it is not easy to incorporate the shock absorber 7 in the working direction of the air cylinder 5 because of the internal structure of the apparatus.

The air cylinder 5 has a large spring effect.
It is conceivable to use an oil cylinder with a small spring effect in place of this, but since the oil cylinder has a slow response speed, it cannot respond to the request for high-speed joining, and there is a risk of oil leakage. Use is not preferred.

The present invention is intended to solve the problems of the prior art as described above, and presses a splice roll driven by an air cylinder between the first web and the second web to join them. In a continuous unwinding device for adhering and unwinding continuously, the bounce of the splice roll is suppressed regardless of the diameter of the web, and the first web and the second web are stably reliable. The purpose is to make it possible to make a high joint and to easily incorporate such a bouncing suppression mechanism into a continuous unwinding device.

[0012]

The inventors of the present invention have not attenuated the collision energy when the splice roll is driven by an air cylinder and pressed against the joining portion between the first web and the second web. It was found that it is preferable to suppress recoil, and for that purpose, it is effective to provide a shock absorber with a check valve in the action direction of the splice roll, and the present invention has been completed.

That is, according to the present invention, in order to bond and continuously unwind the first web and the second web, a splice roll driven by an air cylinder is pressed against and bonded to the bonded portion. Provided is a continuous unwinding device, wherein a shock absorber with a check valve is provided in a direction of action for suppressing recoil of a splice roll.

[0014]

In the continuous unwinding device of the present invention, since the splice roll is driven by the air cylinder, the response speed of the cylinder itself is high.

Further, a shock absorber with a check valve is provided in a direction in which the recoil of the splice roll is suppressed. The shock absorber with a check valve generally operates as follows. That is, for example, like the shock absorber 8 with a check valve shown in FIG.
When "a" is advanced in the direction of arrow C, the oil 8b flows into the internal chamber 8c as indicated by arrow D, so that the resistance is small and the advance of the rod 8a is not suppressed.

On the other hand, as shown in FIG. 3 (b), when the rod 8a is retracted in the direction of the arrow D, the check valve 8d prevents the oil 8b from moving backward in the flow path into the internal chamber 7c. Since it flows out from the inner chamber 8c through the orifice hole 8e to the outer chamber 8f as shown by an arrow E, its resistance increases and the backward movement of the rod 8a is suppressed. In addition,
By loosening the release valve 8g, the oil 8b flows out from the inner chamber 8c to the outer chamber 8f with low resistance.

In the present invention, since such a shock absorber with a check valve is provided in the direction of action for suppressing the recoil of the splice roll, the stroke of the splice roll shown in FIG. 3C and its resistance value. As shown in the relationship diagram with, the resistance of the splice roll toward the joint between the first web and the second web is low, but the resistance of the bound area x, that is, after the splice roll hits the joint, The resistance in the jumping direction becomes extremely large. Therefore, its velocity when the splice roll hits the juncture of the first web and the second web is hardly damped,
It becomes possible to satisfy the high speed of joining, and after the splice roll hits the joining portion between the first web and the second web, the splicing roll presses the joining portion for a predetermined time without bouncing. Therefore, it is possible to improve the reliability of the joining.

Further, providing the shock absorber with a check valve in the direction of action for suppressing the recoil of the splice roll is more important than installing the shock absorber in the direction of action of the air cylinder 5 as shown in FIG. Will be easier.

[0019]

Embodiments of the present invention will now be described in detail with reference to the drawings. In the drawings, the same reference numerals represent the same or equivalent constituent elements.

Embodiment 1 FIG. 1 is a partial block diagram of the vicinity of an air cylinder 5 and a shock absorber 8 with a check valve in a continuous unwinding device according to an embodiment of the present invention. In the continuous unwinding device of the same figure, in order to make the shock absorber 8 with a check valve act to suppress the recoil of the splice roll 6, the air cylinder 5 is applied to the water slider 9 which is a holder of the splice roll 6. And the shock absorber with check valve 8 are directly connected in parallel, which is different from the conventional continuous unwinding device shown in FIG.
Others are configured similarly to the conventional continuous unwinding device.

In this apparatus, a splice roll 6 is provided at the joining portion between the first web 1 and the second web 2 for sticking the film unwound from the first web 1 and the second web 2. When pressing it against the air cylinder 5
Increase the air pressure of the cylinder rod 5a
Move forward in one direction. At that time, the rod 8a of the shock absorber 8 with a check valve also advances in parallel in the direction of arrow C2, but the resistance at this time is small, and the splice roll 6 joins the first web 1 and the second web 2 at high speed. Hit the section. When the splice roll 6 hits this joint,
The splicing roll 6 receives a recoil force in the arrow D direction due to the collision energy at that time, but there is a large resistance to retract the rod 8a of the check valve-equipped shock absorber 8 in the arrow D direction. Therefore, after the splice roll 6 hits the joining portion between the first web and the second web, the joining portion can be pressed for a predetermined time without bouncing. When returning the splice roll 6 in the direction of arrow D, the release valve of the shock absorber 8 with a check valve may be opened.

Embodiment 2 FIG. 2 is a partial block diagram of the vicinity of an air cylinder 5 and a check valve-equipped shock absorber 8 of a continuous unwinding device according to another embodiment of the present invention. In the continuous unwinding device shown in FIG. 4, the air cylinder 5 is connected to the water rider 9 via the rotating arm 10 as in the conventional continuous unwinding device shown in FIG. 4 is different from the continuous unwinding device shown in FIG. 4 in that it is directly connected to the swimmer 9 so as to suppress recoil of the splice roll 6.

Also in this apparatus, similarly to the apparatus shown in the first embodiment, the cylinder rod 5a is advanced in the direction of the arrow C1 so that the splice roll 6 is formed at the joint portion between the first web 1 and the second web 2. Press against. At this time, since the rod 8a of the shock absorber 8 with a check valve advances in the direction of arrow C2 with low resistance, the splice roll 6 moves at a high speed to the first position.
The web 1 and the second web 2 are joined. When the splice roll 6 hits this joint, the splice roll 6 receives a recoil force in the direction of arrow D due to the collision energy at that time, but the rod 8a of the shock absorber 8 with a check valve retracts in the direction of arrow D. The resistance is great. Therefore, after the splice roll 6 hits the joining portion between the first web and the second web, the joining portion can be pressed for a predetermined time without bouncing. When returning the splice roll 6 in the direction of arrow D, the release valve 8g of the shock absorber 8 with a check valve may be opened.

With respect to the apparatus as shown in FIG. 2, the bound state of the splice roll 6 was measured as follows. That is, an electrode (thickness: 0.2 mm, width: 1 mm) was formed between the stationary splice roll 6 and the portion to be the joint portion of the second web.
(2.7 mm), and the electrode attached to the splice roll 6 is energized if it is nipping the electrode attached to the second web, and by inputting this to the data recorder, the contact state of the splice roll 6 is established. Bound condition was recorded. In this case, the air cylinder 5 is a BFSAS-80-62, a bellofram cylinder-
(Manufactured by Fujikura Rubber) was used, and a multi-digital data recorder for multi-phenomenon measurement was used as a data recorder. The second web has a diameter of 580 mm and 310 mm.
Bound state was measured for each of these.

Further, for comparison, the bound state was measured in the same manner as described above for webs having different diameters with respect to the same device without the check valve-equipped shock absorber 8 (Comparative Examples 1 and 2).

The results are shown in FIG. From the figure,
In the example, no bounce of the splice roll 6 was observed, but according to the comparative example, it was confirmed that bounce occurred after the first nip. Further, the first nipping time fluctuates according to the diameter of the web and the like, and it moves back and forth in the vicinity of the target point X of the nip, and in Comparative Example 2 in which the nip was delayed, the second web was glued. It was also confirmed that the reliability of joining the webs to each other was extremely low because the bouncing still continued at Y when the part to be pressed should be pressed (glue range).

[0027]

According to the present invention, the first web and the second web
In the continuous unwinding device that presses the splice roll driven by the air cylinder to the joint with the web and sticks the webs to each other so that it can be continuously unwound, the splice roll bounces regardless of the size of the web. Therefore, it is possible to stably bond the first web and the second web with high reliability. Also, the device configuration for that purpose becomes easy.

[Brief description of drawings]

FIG. 1 is a partial configuration diagram in the vicinity of an air cylinder and a shock absorber with a check valve of a continuous unwinding device according to an embodiment of the present invention.

FIG. 2 is a partial configuration diagram in the vicinity of an air cylinder and a check valve-equipped shock absorber of a continuous unwinding device according to another embodiment of the present invention.

FIG. 3 is an explanatory view of the action of the shock absorber with a check valve of the present invention.

FIG. 4 is a schematic configuration diagram of a conventional continuous unwinding device.

FIG. 5 is a state diagram of a splice roll bouncing.

[Explanation of symbols]

 1 First Web 1a First Web Film 2 Second Web 3 Adhesive 4 Solenoid Valve 5 Air Cylinder 5a Air Cylinder Rod 6 Splice Roll 7 Shock Absorber 8 Shock Absorber with Check Valve 9 Slider 10 Rotating Arm

Claims (3)

[Claims] 1. A continuous unwinding device for pressing and adhering a splice roll driven by an air cylinder to the joining part in order to join and unwind the first web and the second web continuously. A continuous unwinding device, wherein a shock absorber with a check valve is provided in a direction of action for suppressing recoil of a splice roll. 2. The continuous unwinding device according to claim 1, wherein the air cylinder and the shock absorber with a check valve are directly connected in parallel to the holder of the splice roll. 3. The continuous unwinding device according to claim 1, wherein the air cylinder is connected to the holder for the splice roll via a rotating arm, and the shock absorber with a check valve is directly connected to the holder for the splice roll. ..