JP2001261199A - Sheet winding method and sheet separate winding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plurality of narrow sheets divided by a slitter so as not to be defective without providing a support roller for preventing the deflection of an air shaft around individual winding cores held in adjacent states by the air shaft. SOLUTION: In this sheet separate winding device, a plurality of narrow sheets S is wound around individual winding cores C retained in adjacent states by an air shaft 2 having a pneumatic expansible and contractible tube 6 for pressing a lug 5 to the winding core inside surface while dividing a broad sheet S0 into the narrow sheets S by a slitter 1. In the device, the pressure of the compressed air to be supplied to the tube 6 is set small in winding start and set large when the sheet winding quantity on the winding core C is increased by an air pressure automatic control device 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for winding a sheet, such as a sheet of paper, plastic film, or the like, into a plurality of sheets, and winding the sheet around individual winding cores on an air shaft. The present invention relates to a convenient sheet dividing and winding device.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 4, a wide sheet S0 is cut into a plurality of narrow sheets S by cutting a wide sheet S0 in a longitudinal direction with a lower blade roller 1a and a rotating upper blade 1b. A known slitter 1 for splitting is provided. The cores C of a plurality of narrow sheets S are held adjacent to each other by an air shaft 2, and both ends of the air shaft 2 are supported by bearings and rotated by a winding driving device (not shown). The sheet roll R is formed by driving and winding each narrow sheet S around an individual winding core C. FIG. 4 shows the touch roller 3 which comes into contact with the outer periphery of the sheet roll R during the winding of the sheet. However, the touch roller 3 may not be provided in some cases.

FIG. 5 is a longitudinal sectional view showing a part of an air shaft commonly used in the above-mentioned sheet winding device. Such an air shaft 2 has a hollow core C
And a pneumatic pressing mechanism 6 for pressing the lug 5 against the inner peripheral surface of the core on the shaft 4 by the action of compressed air. The illustrated pneumatic pressing mechanism 6 includes:
A tube that expands in accordance with the pressure of the supplied compressed air. When the core is fixed, compressed air is supplied to the tube 6 from the plug 7 with a check valve to expand the tube as shown by a chain line. The lug 5 is pushed up to project from the outer peripheral surface of the shaft body 4 through a hole provided in the shaft body 4, and the core is firmly held so as to rotate together with the shaft body 4. When releasing the holding of the core, the function of the check valve of the stopper 7 is released to release the air in the tube. Since the compressed air in the tube 6 does not escape during the winding of the sheet, the pressing force of the lug 5 on the inner peripheral surface of the winding core is kept constant.

Conventionally, in the above-described sheet dividing and winding apparatus, if the winding diameter of the sheet roll increases during winding, the air shaft 2 is bent as shown in FIG. The sheet roll R wound around C is deformed into a bowl shape, and is likely to be defective. Therefore, in the related art, the outer peripheral surface of the sheet roll is supported from below by a supporting roller during winding to prevent the air shaft from bending.

[0005]

However, if the deflection of the air shaft is prevented as described above, the air shaft and the support roller must be separated from each other in accordance with an increase in the radius of the sheet roll. When the control becomes complicated, the size of the apparatus increases and the workability deteriorates. Therefore, the present invention provides a plurality of narrow sheets divided by a slitter,
It is an object of the present invention to wind up the winding core so as not to be defective without providing a supporting roller for preventing the air shaft from bending around each winding core held in an adjacent state by the air shaft.

[0006]

SUMMARY OF THE INVENTION According to the present invention, the pressure of compressed air supplied to a pneumatic pressing mechanism for pressing a lug against the inner peripheral surface of a core of an air shaft at the beginning of winding is reduced, thereby reducing the pressure on the core. When the sheet winding amount increases, the pressure of the compressed air supplied to the pressing mechanism is increased.

By supplying compressed air with low pressure to the pneumatic pressing mechanism of the air shaft at the beginning of winding, even if the core is easily deformed like a thin paper tube or a plastic tube, When the core is penetrated by the shaft and the inner peripheral surface is pressed by the lugs, the pressing force by the lugs on the inner peripheral surface is reduced, so that the core is deformed into a polygonal shape, for example. Poor quality can be prevented. In addition, since the winding torque at the start of winding is small, even if the pressing force of the lug is reduced, the winding core can be securely fixed to the shaft so as not to run idle.

When the winding amount of the sheet on the core increases to a certain extent, the core is reinforced by the sheets wound on the core in a number of layers. However, the core is not substantially deformed. Therefore, as the sheet winding amount increases, the pressure of the compressed air supplied to the pneumatic pressing mechanism that presses the lug against the inner peripheral surface of the core increases, thereby increasing the pressing force of the lug to the inner periphery of the core. This prevents the core from being shifted in the longitudinal direction of the shaft and leaving a gap between the adjacent cores, and prevents the sheet roll from deforming into a bowl shape and becoming defective.

[0009]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 shows a sheet winding device which is convenient for carrying out the sheet winding method of the present invention.
The sheet dividing and winding device winds the narrow sheet S around the individual cores C held by the air shaft 2 while dividing the wide sheet S0 into a plurality of narrow sheets S by the slitter 1. The air shaft 2 supplies compressed air to the inside of the rubber tube 6 so that the tube 6 expands and pushes up the lug 5, and the lug 5 removes the inner peripheral surface of the core C on the shaft 4. By pressing, the core C is moved to the shaft 4
Can be held firmly so as to be able to rotate integrally with it. Then, in order to adjust the pressing force by the lug 5, the pressure of the compressed air supplied to the tube 6 is reduced at the beginning of the winding, and the tube 6
An automatic pneumatic control device 10 capable of increasing the pressure of the compressed air supplied to the vehicle.

The automatic pneumatic control device 10 switches the two pressure reducing valves 11 and 12 and the passages 13 and 14 on the output side thereof so that the passage 15 communicates with the tube 6 of the air shaft 2.
And a switching valve 16 that can selectively supply the compressed air output from the pressure reducing valves 11 and 12 to the passage 15. Further, the winding amount of the sheet on the winding core C held by the air shaft 2 is detected every time during winding by the known detecting device 17, and the detected value reaches the sheet winding amount set in the setting unit 18. At the time, a control device 19 is provided to output a control signal to the switching valve 16 to perform a switching operation. Pressure reducing valve 1
1 and 12, compressed air is supplied to the input side, and the pressure of the compressed air on the output side can be adjusted to a set magnitude. The control device 19 compares the set value of the sheet winding amount and the detected value. A known electronic circuit for comparison is provided. The sheet winding amount detecting device 17 may detect the radius of the sheet roll R wound on the core C, or may detect the length of the narrow sheet wound on the core C. It may be something.
The passage 15 for the compressed air is provided with a switching valve 2 for releasing the compressed air from the tube 6 when the core C is released.
0, passage 21, rotary joint 22, and shaft 4
Is connected to the tube 6 through a hole 23 provided in the shaft portion 4a.

In order to wind the sheet by this sheet winding device, a small pressure is set to the pressure reducing valve 11 so that the core C does not idle in order to prevent the core C from being deformed at the beginning of winding. In order to ensure that the adjacent core C on the shaft body does not slip in the longitudinal direction with respect to the shaft body 4 when the sheet winding amount becomes large, another pressure reducing valve 12 is set to a large pressure. Keep it. In addition, the sheet winding amount when changing from a small pressing force to a large pressing force is set in the control device 19. Then, the compressed air is extracted from the tube 6 by operating the switching valve 20, and the shaft 4 is inserted through the hollow portion of the core C.
By operating the switching valve 20 in the opposite direction again, the passages 15 and 21 are operated.
Is connected, the tube 6 is expanded, the lug 5 is pushed up, and the core C is held. Then, the leading end of the narrow sheet is adhered to the core C to start winding. The sheet winding amount is set by the setting unit 18.
Passage 13 and Passage 1 until the sheet winding amount is set to
5 is connected thereto, and compressed air having a small pressure output from the pressure reducing valve 11 is supplied to the tube 6. When the sheet winding amount becomes larger than the value set in the setting section 18, a switching signal is output from the control device 19 to the switching valve 16, the switching valve 16 is operated, the passage 14 and the passage 15 are connected, and the pressure reducing valve 12 is connected. Compressed air having a large pressure output from the tube 6 is supplied to the tube 6. Therefore, during the winding of the sheet, the compressed air having a small pressure is supplied to the tube 6 at the beginning of the winding, and the compressed air having a large pressure is supplied to the tube 6 when the amount of winding the sheet on the winding core C increases. The sheet winding method is automatically performed. Further, this automatic pneumatic control device can be constructed relatively simply. The sheet winding amount set in the setting unit 18 and the pressure of the compressed air obtained from the pressure reducing valves 11 and 12 are set in advance by trial winding according to the winding conditions such as the material, thickness, and winding torque of the core. By doing so, it can be determined experimentally. In addition, the automatic air pressure control device includes three or more pressure reducing valves as necessary, and switches the pressure with a plurality of switching valves. May be done.

FIG. 2 shows a sheet dividing and winding apparatus capable of imparting an appropriate holding force of a core to an air shaft according to various winding conditions, thereby enabling more effective winding. . In this sheet split winding device, the automatic pneumatic control device 10 includes a pressure control valve 24 that outputs compressed air to a passage 15 that communicates with the tube 6 of the air shaft 2, and a control device 25 that outputs a control signal to the pressure control valve 24. And The control device 25 has a setting unit 26 that can set a change schedule of the required pressure of the compressed air supplied to the tube 6 with respect to the sheet winding amount, and a detection device 17 that detects the sheet winding amount every moment. Based on the setting value of the setting unit 26 and the detection value of the detection device 17, the required pressure is calculated every moment so that the pressure of the compressed air supplied to the tube 6 changes according to the set change schedule, and the control signal is calculated. put out. The control device 25 is configured using a microcomputer,
The function of the required pressure, in which the set value of the setting unit 26 is used as an auxiliary variable and the sheet winding amount is used as a variable, is stored. In the setting unit 26, the required pressure schedule for the sheet winding amount can be changed and set in various ways, and the set change schedule can be displayed as a diagram on a display unit (not shown). If the pressure control valve 24 can obtain the pressure specified for the received control signal,
It may be an electropneumatic converter capable of receiving an electrical input signal and obtaining a regulated pressure for the input signal, or receiving a pneumatic input signal and regulated for the pneumatic signal. It may be a control valve for obtaining a certain pressure.

In the automatic pneumatic control device 10, a pressure gradually increasing as the sheet winding amount increases as shown by a curve P in FIG. 3, for example, can be set in the setting section 26. That is, at the beginning of winding, the required pressure is programmed such that the required pressure is reduced so that the winding core C is not deformed, and the required pressure gradually increases as the sheet winding amount increases. be able to.

[0014]

According to the sheet winding method of the present invention, even if a support roller for preventing the air shaft from bending is not provided, the divided narrow sheets are individually held in an adjacent state. It can be wound around so as not to be defective. Further, the structure of the sheet dividing and winding device can be simplified, and workability can be improved.

Further, in the sheet dividing and winding apparatus of the present invention, if the required value is set in advance in the setting section, the sheet winding method of the present invention can be automatically carried out during winding, so that the operability is good and the productivity is high. Is improved.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram according to an embodiment of a sheet division winding device of the present invention.

FIG. 2 is an explanatory view according to another embodiment of the sheet dividing and winding device of the present invention.

3 is a diagram illustrating a program of a required pressure set in a setting unit in the automatic pneumatic control device shown in FIG. 2, with a horizontal axis corresponding to a sheet winding amount and a vertical axis corresponding to pressure;

FIG. 4 is a schematic perspective view for explaining a sheet division winding device to which the sheet winding method of the present invention is applied.

FIG. 5 is a longitudinal sectional view showing the vicinity of one end of an air shaft.

FIG. 6 is an explanatory diagram for explaining a state in which a sheet roll has a bowl shape.

[Explanation of symbols]

 C winding core S0 wide sheet S narrow sheet 1 slitter 2 air shaft 4 shaft 5 lug 6 tube 10 automatic air pressure control device 11 pressure reducing valve 12 pressure reducing valve 15 compressed air passage 16 switching valve 17 sheet winding amount detecting device 18 Setting unit 19 Control device 22 Rotary joint 24 Pressure control valve 25 Control device 26 Setting unit

Claims (4)

[Claims] 1. A wide sheet is divided into a plurality of narrow sheets by a slitter, and the narrow sheets are adjacent to each other by an air shaft having a pneumatic pressing mechanism for pressing a lug against an inner peripheral surface of a core. A method of winding a sheet around individual winding cores held in the step, wherein the pressure of compressed air supplied to the pressing mechanism is reduced at the beginning of winding, and the pressure is supplied to the pressing mechanism when the sheet winding amount increases. A sheet winding method comprising increasing the pressure of compressed air. 2. A wide sheet is divided into a plurality of narrow sheets by a slitter, and the narrow sheets are adjacent to each other by an air shaft having a pneumatic pressing mechanism for pressing a lug against an inner peripheral surface of a core. In the sheet split winding device that winds around the individual winding cores held in step 1, the pressure of the compressed air supplied to the pressing mechanism is reduced at the beginning of the winding, and the compressed air supplied to the pressing mechanism is increased when the sheet winding amount increases. A sheet split winding device comprising an automatic pneumatic control device capable of increasing air pressure. 3. The automatic air pressure control device selectively switches between a plurality of pressure reducing valves and compressed air output from the plurality of pressure reducing valves and supplies the compressed air to a passage of the compressed air leading to the core holding mechanism. And a detection valve, which detects the winding amount of the sheet on the winding core every time during winding by a detecting device, and the detected value is:
The sheet winding device according to claim 2, further comprising: a control device that switches the switching valve when the sheet winding amount set in the setting section is reached. 4. The automatic pneumatic control device includes: a pressure control valve that outputs compressed air to a passage leading to the core holding mechanism; and a control device that outputs a control signal to the pressure control valve. A setting unit that can set a change schedule of a required pressure of the compressed air supplied to the pressing mechanism with respect to a sheet winding amount, and a detection device that detects a sheet winding amount every moment, and sets the setting unit. 3. The sheet dividing and winding device according to claim 2, wherein a control signal is output based on the value and the detection value of the detection device such that the pressure of the compressed air supplied to the pressing mechanism changes along a set change schedule.