JP2005206348A - Web storing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a web storing device capable of restraining wrinkles by surely preventing meandering with a simple structure. <P>SOLUTION: According to this device, a web 1 supplied from a web relay mechanism 4 is wound between a stationary roller 8 and a dancer roller 10, and the web 1 is stored by the movement of the dancer roller 10. Diameters of ends 10a, 10b of the dancer roller 10 contacting both ends of the web 1 are formed larger than a diameter of a central part 10c contacting a center of the web 1. The stationary roller 8 is provided with a central groove 26 formed at the center of the web 1 in a perimeter direction and a pair of spiral grooves 28, 30. The pair of grooves 28, 30 is connected with the central groove 26, and formed symmetrically toward both ends from the center of the web 1. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a web splicing device that stores a web supplied from a web splicing mechanism when a web splicing mechanism is spliced with new and old webs.

  Conventionally, when a web is continuously supplied to a consumption mechanism from a roll wound with a web of printing paper, cardboard base paper or plastic film, the old roll where the web is consumed is replaced with a new roll, The front end of the web from the new roll is connected to the rear end of the web from the old roll by the web splicing mechanism. While the web is being spliced by the web splicing mechanism, the web supply from the roll is stopped, but a web storage device is provided between the web splicing mechanism and the consumption mechanism, and the web stored in the web storage device is consumed. The web can be supplied while the web is being connected by the web splicing mechanism.

  As such a web storage device, as disclosed in Patent Document 1, a web is wound between a plurality of fixed rollers and a plurality of dancer rollers, the dancer rollers are moved, and the path length of the web supply path is increased. There is a known modification that allows the web to be stored. And while continuing the web, the dancer roller is moved so that the web can be supplied from the web storage device.

Further, when the web supply speed is accelerated or decelerated, the web tension may change, causing the web to meander and wrinkle. In order to solve this, in Patent Document 1, before accelerating or decelerating the web, the hydraulic pressure of the hydraulic cylinder that moves the dancer roller is increased to a set pressure, and after the web is transferred, the dancer roller changes from rising to lowering. At the time, the rising hydraulic pressure and the lowering hydraulic pressure are supplied to the hydraulic cylinder at the same time to prevent the meandering of the web and the generation of wrinkles due to the air being caught between the web and the roller due to the change in tension.
JP-A-4-298444

  However, with such conventional devices, the set pressure must be increased during web acceleration or deceleration, or the supply pressure to the hydraulic cylinder must be controlled when the dancer roller changes from rising to lowering. There is a problem that it is difficult to accurately control.

  An object of the present invention is to provide a web storage device that can reliably prevent meandering and suppress the occurrence of wrinkles with a simple configuration.

In order to achieve this problem, the present invention has taken the following measures in order to solve the problem. That is,
In a web storage device that winds a web supplied from a web splicing mechanism between a fixed roller and a dancer roller and stores the web by movement of the dancer roller,
The dancer roller is formed such that the diameter of the end contacting the both ends of the web is larger than the diameter of the center contacting the center of the web,
The fixed roller includes a spiral groove, which is a web storage device.

  The groove may be composed of two strips. The fixed roller may include a pair of grooves, and the pair of grooves may be formed symmetrically from the center of the web toward both ends. Further, the fixed roller may include a central groove formed in a circumferential direction in the center of the web, and the pair of grooves may be connected to the central groove.

  As described above, the web storage device of the present invention has an effect that it is possible to reliably prevent meandering and to suppress the occurrence of wrinkles with a simple configuration in which grooves are formed in the fixed roller and the diameters of both ends of the dancer roller are increased. Play.

The best mode for carrying out the present invention will be described below in detail with reference to the drawings.
As shown in FIG. 1, reference numeral 1 denotes a web. In this embodiment, the web 1 is a printing paper or a cardboard base paper. The web 1 is wound around rolls 2 a and 2 b, and the rolls 2 a and 2 b are arranged in the web splicing mechanism 4. The web splicing mechanism 4 supplies the web 1 from one roll 2a, and when the roll 2a is consumed, the front end of the other roll 2b is spliced to the rear end of the web 1 with an adhesive tape (not shown), and the other roll The web 1 is continuously supplied from 2b. When the web 1 is joined, the supply of the web 1 is stopped, and the leading end of the other roll 2b is joined to the rear end of the web 1 in the stopped state.

  The web 1 from the web splicing mechanism 4 is supplied to the web storage device 6. As shown in FIG. 2, the web storage device 6 includes a plurality of fixed rollers 8 and a plurality of dancer rollers 10. The fixed roller 8 is rotatably supported by the apparatus main body 12, and the dancer roller 10 is rotatably supported by a moving base 14 that is supported movably by the apparatus main body 12.

  One end of a chain 18 is fastened to the moving table 14 and is configured to be balanced with the moving table 14 by an air cylinder 16 via the chain 18. Further, the chain 18 can be balanced with the weight of the moving table 14 by the air cylinder 16 via the sprocket 22, and can supply or exhaust a constant air pressure to move the moving table 14 in the vertical direction with high response and high speed. It is configured as follows.

  In this embodiment, as shown in FIGS. 3 and 4, the plurality of dancer rollers 10 are provided on the movable table 14 in two upper and lower stages and in five rows in the horizontal direction. As shown in FIG. 7, each dancer roller 10 is formed such that the diameters of the end portions 10a and 10b on both ends are large and the diameter of the central portion 10c is small. The end portions 10a and 10b are provided at locations where both ends of the web 1 are in contact with each other, and the center side of the web 1 is provided so as to contact the center portion 10c.

  For example, about 10 to 30% in the width direction of the web 1 is in contact with both end portions 10a and 10b of the dancer roller 10, and the remaining central portion in the width direction of the web 1 is in contact with the center portion 10c of the dancer roller 10. It is good to form. Moreover, in this embodiment, the diameter of the edge parts 10a and 10b of the dancer roller 10 is 88 mm, and the diameter of the center part 10c is 0.4 to 0.5 mm smaller than that.

  On the other hand, as shown in FIGS. 3 and 4, the plurality of fixed rollers 8 are provided in three rows in the vertical direction and in six rows in the horizontal direction. When the dancer roller 10 is moved down most when the moving table 14 is moved, the upper and lower two-stage dancer rollers 10 enter between the lower two-stage fixed rollers 8 as shown in FIG. Then, the fixed roller 8 and the dancer roller 10 are arranged alternately.

  The lowermost fixed rollers 8 are arranged on both outer sides in the horizontal direction, and guide the web 1 to a consumption mechanism (not shown). In the uppermost stage, the sensor 24 is disposed on the fixed roller 8 on the inlet side where the web 1 is introduced, and the rotation speed of the fixed roller 8 is detected and the supply speed and supply length of the web 1 are detected. It can be detected.

  As shown in FIG. 8, each fixed roller 8 is formed with a narrow central groove 26 in the center of the fixed roller 8 so as to make one round in the circumferential direction. On the outer periphery of the fixed roller 8, a pair of spiral grooves 28 and 30 are formed in succession so that one end side is connected to the central groove 26 and the other end side reaches the end of the fixed roller 8. The pair of grooves 28 and 30 are formed symmetrically with respect to the central groove 26 of the fixed roller 8, and the spiral winding directions of the pair of grooves 28 and 30 are formed in opposite directions. Yes. In this embodiment, the diameter of the fixed roller 8 is 88 mm, and the pair of grooves 28 and 30 are formed to have a width of 3 mm and a depth of 0.25 mm. The central groove 26 is formed to have a width of 25 mm and a depth of 0.25 mm.

  Further, as shown in FIG. 9, two pairs of spiral grooves 28 and 30 may be formed. At this time, the phases of the grooves 28 and 30 may be formed so as to be shifted by 180 degrees. Further, the pair of spiral grooves 28 and 30 are formed such that the winding direction moves from the center side to the axially outer side along the spiral depending on the rotation direction of the fixed roller 8.

Next, the operation of the web storage device 6 of the present embodiment described above will be described.
First, as shown in FIG. 5, the movable table 14 is moved down most. Thereby, the fixed roller 8 and the dancer roller 10 are arranged in three stages. Then, the web 1 supplied from the web splicing mechanism 4 is passed between the upper stage where the fixed rollers 8 are arranged and the central stage where the fixed rollers 8 and the dancer rollers 10 are arranged. It passes between the lower stage where the roller 8 and the dancer roller 10 are lined up. Subsequently, after passing through the lower stage, the sheet is folded again and supplied to a consumption mechanism (not shown) after passing through the lower side of the lower fixed roller 8.

  In this state, as shown in FIG. 6, when the movable table 14 is raised, the web 1 is alternately wound around the fixed roller 8 and the dancer roller 10. Furthermore, as shown in FIG. 4, when the movable table 14 is raised, the path length of the supply path of the web 1 becomes longer and the web 1 is stored.

  When the web 1 of the roll 2a is consumed by the consumption mechanism, the web splicing mechanism 4 joins the front end of the web 1 from the new roll 2b to the rear end of the web 1 from the roll 2a, and the web 1 is transferred from the roll 2b. Supplied. When the web 1 is connected, the supply of the web 1 from the web connection mechanism 4 is temporarily stopped. At that time, the movable table 14 is lowered, and the web 1 is supplied from the web storage device 6 to the consumption mechanism.

  When the web 1 passes through the web storage device 6 at a high speed, each fixed roller 8 and each dancer roller 10 is driven to rotate while the outer periphery is in contact with the web 1. When the web 1 comes into contact with the outer periphery of each fixed roller 8, air may be caught between the web 1 moving at high speed and between the web 1 and the outer periphery of each fixed roller 8. The entrained air flows into the pair of grooves 28, 30, flows through the grooves 28, 30, and is discharged from the opposite grooves 28, 30 where the web 1 is not in contact with the outer periphery. Further, since the grooves 28 and 30 are formed in a spiral shape, they are also discharged from the center toward the outside in the axial direction. Furthermore, since the grooves 28 and 30 are spirally and symmetrically formed, the web 1 is pulled to both sides in the width direction by friction between the grooves 28 and 30 and the web 1. Therefore, the web 1 does not meander and the generation of wrinkles can be suppressed.

  On the other hand, in each dancer roller 10, the web 1 contacts the outer periphery of each dancer roller 10. When the dancer roller 10 rotates with the web 1 in contact, the end portions 10a and 10b have a larger diameter than the central portion 10c, and thus the peripheral speed is high. Since both end sides of the web 1 are in contact with the end portions 10a and 10b having a fast peripheral speed, a force is applied to the web 1 so that both end sides are pulled at a higher speed. Thereby, the web 1 is pulled to both ends of the dancer roller 10 and is supplied while suppressing the generation of wrinkles with a stronger effect than the fixed roller 8.

  The web splicing mechanism 4 described above is an example in which the rolls 2a and 2b are arranged in the horizontal direction. However, the present invention is not limited to this, and as shown in FIG. 10, the web in which the rolls 2a and 2b are arranged in the vertical direction. The joint mechanism 4 can be similarly implemented. Moreover, although the web storage apparatus 6 mentioned above made the example the case where the movable stand 14 is moved to an up-down direction, as shown in FIG. 11, it is comprised so that the movable stand 14 may be moved to a horizontal direction, as shown in FIG. However, it can be similarly implemented.

  The present invention is not limited to such embodiments as described above, and can be implemented in various modes without departing from the gist of the present invention.

It is a front view of a web splicing mechanism and a web storage device as one embodiment of the present invention. It is a side view of the web storage device of this embodiment. It is AA expanded sectional drawing of FIG. It is an arrangement view of a fixed roller and a dancer roller at a position where the moving table of the present embodiment is most raised. It is an arrangement view of a fixed roller and a dancer roller at a position where the moving table of the present embodiment is lowered most. It is arrangement | positioning drawing of the fixed roller and dancer roller in which the moving stand of this embodiment is going up. It is an enlarged view of the dancer roller of this embodiment. It is an enlarged view of the fixed roller of this embodiment. It is an enlarged view of the fixed roller of other embodiment. It is a front view of the web splicing mechanism of other embodiment. It is a front view of the web storage device of other embodiments.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Web 2a, 2b ... Roll 4 ... Web splicing mechanism 6 ... Web storage apparatus 8 ... Fixed roller 10 ... Dancer roller 10a, 10b ... End part 10c ... Central part 12 ... Apparatus main body 14 ... Moving stand 16 ... Balance cylinder 26 ... Central groove 28, 30 ... groove

Claims (4)

In a web storage device that winds a web supplied from a web splicing mechanism between a fixed roller and a dancer roller and stores the web by movement of the dancer roller,
The dancer roller is formed such that the diameter of the end contacting the both ends of the web is larger than the diameter of the center contacting the center of the web,
The web storage device, wherein the fixed roller includes a spiral groove. The web storage device according to claim 1, wherein the groove includes two strips. 3. The web according to claim 1, wherein the fixed roller includes a pair of grooves, and the pair of grooves is formed symmetrically from the center of the web toward both ends. Storage device. The web storage device according to claim 3, wherein the fixed roller includes a central groove formed in a circumferential direction in the center of the web, and the pair of grooves are connected to the central groove.

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