JPH01127545A - Method and device for winding web - Google Patents

Abstract

PURPOSE:To prevent the occurrence of winding loosening in a web roll by selecting a reduction ratio suited to a wound-up web roll out of plural set reduction ratios and, after finishing winding an web, reducing the rotating speed of a core at the selected reduction ratio and making the rotating speed zero. CONSTITUTION:When the winding of a web 10 onto a core 28A is completed, a turret arm 24 is rotated to place an empty core 28B in a winding position. The web 10 is pressed against and fixed to the core 28B accompanying the rotation of the arm 24. Then, the web 10 is cut off and the cut web 10 is wound up onto a web roll 19. At this time, since plural deceleration patterns (a)-(d) are previously set so that the reduction ratio at which the rotating speed of the core at the end of the winding of the web becomes zero is suited to the types of web rolls, the pattern is selected by a pattern selecting portion 52. Since the rotating speed of the web roll 19 is reduced at the deceleration pattern suited to it, the rotation of the web roll 19 can be stopped without causing winding loosening.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method and apparatus for winding a web in which a long strip of paper, plastic, metal foil, etc. (hereinafter referred to as web) is wound around a core. .

[Prior art]

Generally, the web is wound around a core to form a product or roll. To wind such a long belt-like web around a core, the core is supported on the winding shaft of a rewinding machine, and when the web begins to be wound, the friction between the web and the core is used to rotate the core. A web winding device is used that automatically winds the web around a winding core.

As shown in FIG. 4, after winding the web, the rotating core is decelerated at a constant reduction ratio and stopped in order to attach a new core. However, the web roll tries to rotate at the speed before deceleration due to inertia force, and tries to rotate at a higher speed than the decelerated core. As a result, an inertial force is generated that is greater than the static friction force of the wound web. As a result, the web roll becomes loose, and a gap A is created between the webs, as shown in FIG. 5(b).

Moreover, this gap A may become a large space A1 as shown in FIG. 5(C). This loose winding occurs more frequently when products are diversified and manufactured efficiently at high speed.

Therefore, as a measure to prevent the winding from loosening, there is a method of holding the entire web roll, a tension-up winding method, or a terminal fixing method of fixing the terminal of the wound web with tape as shown in Japanese Patent Publication No. 61-29301. is used.

[Problems to be Solved by the Invention] However, the method of pressing the entire web roll and the tension-up winding method have problems such as dust adhering to the web, abrasions, etc. Wrinkles.

There is a problem that occurs. Furthermore, the terminal fixing method has a problem in that the winding loosens frequently due to poor fixation of the terminal.

The present invention has been made in view of the above circumstances, and provides a method and device for winding a web that does not cause dust to adhere to the web, scratches or wrinkles, and does not cause loosening of the web roll. It is intended to provide.

[Means for solving problems]

In order to achieve the above object, the present invention sets in advance a plurality of reduction ratios until the number of rotations of the winding core reaches zero at the end of web winding, so as to suit the type of web roll. The present invention is characterized in that a reduction ratio suitable for the wound web roll is selected from among a plurality of reduction ratios, and after the web winding is completed, the rotation of the winding core is reduced to zero using the selected reduction ratio.

[Effect]

In the present invention, by selecting a speed reduction ratio suitable for the wound web, it is possible to stop the web roll by decelerating it in accordance with the type of web roll. As a result, it is possible to prevent a type of static friction force from occurring that is greater than the static friction force of the wound web, and it is possible to prevent the web roll from loosening.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the web winding method and device according to the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a side view of a rewinding machine provided with a winding device according to the present invention, a feed device, and a delivery device through which a web is delivered.

As shown in FIG. 1, the web 10 is supplied from a delivery device 12 to a feeding device! It passes through t14 and is wound onto the winding shaft 18A of the rewinding machine 16. A support 22 is erected on a base 20 of the rewinding machine 16, and a turret arm 24 is attached to the support 22 so as to be rotatable about a shaft 26. The turret arm 24 is intermittently rotated counterclockwise about the shaft 26 every 180 degrees, and the winding shafts 18A and 18B at both ends are alternately repositioned. Winding core 28 attached to winding shaft 18A
When the winding of the web onto A is completed and the web roll 19 is formed, as shown in FIG. 2, the turret arm 24
rotates counterclockwise, and the winding core 28B attached to the winding shaft 18B moves to the winding position of the winding core 28A shown in FIG. 1 and starts winding the web 10.

Further, the web winding device 30 according to the present invention is composed of blocks 32 and 34 provided above and below, as shown in FIG. be lowered. Further, the lower block 34 is supported by the base 20 of the rewinding machine 16 and raised by a cylinder 38. The web 10 is the winding shaft 18
When the winding is completed at the winding position A, the turret arm 24 rotates counterclockwise, and the winding shaft 18B moves to the winding position of the winding shaft 18A, the winding device starts moving as shown in FIG. 30
As the upper block 32 is lowered, the lower block 34 is raised, and the blocks 32, 34 are arranged close to each other around the winding shaft 18B.

Further, a rotary cutter (not shown) is provided approximately at the center of the lower block 34 so as to be movable up and down. This cutter cuts the web 10 by running horizontally.

Furthermore, the rotating shaft of a motor 46 is connected to the winding shafts 18A and 18B, as shown in FIG.

A rotation speed detection sensor 48 for detecting the rotation speed of the motor 46 is attached to the motor 46 . The motor 46 and the rotation speed detection sensor 48 are connected to the control section 50 by a cable. The control section 50 includes a pattern selection section 52, a data input section 54, a pattern calculation section 56, and a speed control section 5.
It has 8. The pattern selection unit 52 arbitrarily selects four deceleration patterns aSb and cSd shown in FIG. The data input unit 54 inputs the data necessary for the selected deceleration pattern, namely the deceleration time T (T+ to Tl) and the radius R (for smoothly moving from constant speed to deceleration or from deceleration to constant speed). Input R1-R3-).

Furthermore, the pattern calculation unit 56 calculates the rotational speed (■) during deceleration from the relationship between the deceleration pattern after data input and the rotational speed (■o) before deceleration. The speed control unit 58 instructs the motor 46 to specify this rotational speed ■, and also outputs the rotational speed detection sensor 4.
The actual rotational speed V' of the motor 46 fed back through 8 is controlled to follow the rotational speed 2 calculated by calculation.

Next, the deceleration pattern shown in FIG. 3 will be explained in detail.

Each of the diagrams a, b, c, and d shown in FIG. 3 shows the rotational speed of the web roll 19 on the vertical axis and the deceleration (stop) time T on the horizontal axis, and shows four deceleration patterns according to the present invention. It shows.

The deceleration pattern a is such that when moving from constant speed ■o to deceleration, the deceleration is gradually increased until a certain deceleration is reached, and the deceleration follows the curve of radius R1, thereby reducing the impact during deceleration. can do. In the deceleration pattern b, the inertial force can be reduced by reducing the deceleration. The deceleration pattern C is a step-like deceleration, whereby the speed is kept constant for T2 just before the winding of the web roll 19 becomes loose, and after the winding is stabilized, the deceleration is again decelerated for T, repeating the deceleration pattern. be able to. d
The deceleration pattern is a combination of the aSb and C deceleration patterns. - By way of example, these deceleration patterns a, bSc and d are respectively polyethylene,
It is used for web rolls 19 wound with laminated paper, paper webs and smooth flat webs. As a result, the web roll 19 stops without winding loosening.

According to the web winding method and device of the present invention configured as described above, when winding of the web 10 onto the winding core 28A at the winding position of the rewinding machine 16 is completed, the turret arm 24 is rotated 180 degrees around the shaft 26, and the empty winding core 28B is located at the winding position as shown in FIG.

The web 10 is pulled to the position of the winding core 28A as the turret arm 24 rotates, and winding is started on the winding core 28A.
It is pressed and fixed to the 8B surface. Next, the web 10 is cut by moving a rotary cutter (not shown). The cut web IO is wound onto a web roll 19. The wound web roll 19 is decelerated in a deceleration pattern suitable for this web roll 19. Thereby, the rotation of the web roll 19 can be stopped without causing loosening of the web roll.

〔Effect of the invention〕

As explained above, according to the web winding method and device according to the present invention, a deceleration pattern suitable for the web roll can be selected when the web roll is decelerated. Thereby, it is possible to prevent an inertial force larger than the static friction force of the wound web from being generated, and as a result, it is possible to prevent the web roll from loosening.

[Brief explanation of the drawing]

FIG. 1 is a side view of a rewinding machine equipped with a web winding device according to the present invention, a feeder device, and a delivery device from which a web is sent out, and FIG. 2 is a side view and rotation of the web winding device according to the present invention. Flowchart of the speed control device, FIG. 3 shows the deceleration pattern according to the present invention, FIG. 4 shows the conventional deceleration pattern, and FIG. 5 shows the normal state of the web roll, the loosened state, and the occurrence of spaces It is a side view which shows a state. 10... Web, 18A, 18B... Winding shaft,
19... Web roll, 28A, 28B...
- Winding core, 50...control unit.

Claims (2)

[Claims] (1) In the method of winding the web onto the core, multiple reduction ratios are set in advance to match the type of web roll until the number of rotations of the core reaches zero at the end of web winding. , selects a reduction ratio suitable for the web roll being wound from multiple set reduction ratios, and reduces the rotation of the winding core to zero by the selected reduction ratio after web winding is completed. Characteristic web winding method. (2) In a web winding device having a rotatable winding shaft that supports a winding core for winding the web, a rotation speed detection sensor and a rotation speed sensor for reducing the rotation speed of the winding shaft to zero at the end of web winding are installed. a pattern selection unit that sets a plurality of reduction ratios in advance to match the type of web roll, and selects a reduction ratio suitable for the web roll wound from among the reduction ratios based on output data of the rotation speed detection sensor; A web winding device comprising: a speed control unit that reduces the rotational speed of a winding shaft of a web roll wound up to zero according to the selected reduction ratio.