JPS61273451A - Sheet wind-up device - Google Patents

Abstract

PURPOSE:To prevent a core from being bent, and to eliminate the generation of longitudinal creases in a sheet due to the tension of the sheet, by providing a sheet roller which rotates while supporting the outer surface of roll of the sheet wound around the core, overcoming a bending load which is exerted to the core by the tension of the sheet to be wound up onto the core. CONSTITUTION:A core support roller 10 which is supported at both ends thereof by the front end sections of right and left support arms 6, swings in association with the growth of a sheet roll Sr. When the sheet roll Sr is shifted into a position Sr' along the locus A due to its growth, the support roller 10 is shifted into a position 10' along a locus B to bear a bending load (f) without hindering the growth of the sheet roll Sr. Since it is only during the initial stage of wind-up at which the wound-up diameter of the sheet rolls is thin, that there is a risk of bending the sheet roll Sr by the load (f) and since the bending resistance of the sheet roll Sr increases when the diameter of the sheet rolls Sr comes to be large, and the support roller 10 becomes unnecessary at that time, and therefore, retracts into a position 10'' as indicated by a chain line, at one end of the locus B. With this arrangement, it is possible to prevent the core from being bent, and to completely eliminate the side slip or edged of the sheet due to the bending and the generation of creases in the sheet due to that.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a sheet winding device for winding a strip-shaped sheet of paper, plastic film, metal foil, etc. onto a sheet roll using a winding shaft.

<Prior art> In recent years, the winding technology in this type of winding device has significantly advanced. The sheet supply tension control proposed in No. 13414 is automatically controlled by a computer, and it can be applied to materials that are easily stretched or slippery, such as thin plastic sheets.
Furthermore, it has become possible to wind up a sheet with relatively high quality even if the sheet has uneven thickness portions.

<Problems to be Solved by the Invention> However, when winding a soft and slippery sheet, such as a plastic sheet several microns thick, there is a problem that wrinkles appear on the sheet roll for a while after winding. was there. The reasons for this include the fact that the winding shaft is curved as shown in Figure 5 due to the sheet tension during winding, and that the winding shaft itself is not a perfect right cylindrical shape. .

In addition, in FIG. 4, the centrally driven winding shaft l is brought close to the thick touch roller 2, the sheet S is wound up, and the thin sheet roll S is rolled up.
At the stage when the sheet roll S is made, 0 winding, which indicates a state in which wrinkles W have occurred at the center of the sheet roll Sr and at the center of the sheet S immediately before winding, progresses, and the sheet roll S When it becomes thicker, wrinkles W usually do not occur. However, the wrinkles W formed in the core part appear at the final stage when the sheet roll is rewound and used, so the sheet roll is evaluated as a defective product.

Means for Solving the Problems> Therefore, the present invention aims at reducing the bending load applied to the winding shaft by the tension of the sheet taken up one time in a sheet winding device that winds a belt-like sheet onto a sheet roll with a winding shaft driven centrally. The present invention is characterized in that it includes a support roller that rotates to support the outer surface of the sheet roll wound around the winding shaft. Further, the present invention is characterized in that, in the winding device, the winding shaft is curved in a direction opposite to the direction of the bending load applied to the winding shaft by the tension of the sheet being wound up.

Effect> As mentioned above, this invention has clarified the cause of wrinkles in the early stage of winding. Figure 5.6 is an explanatory diagram of this, in which a sheet roll Sr wound around a center-driven winding shaft (core) L is uniformly distributed due to the tension t of the sheet S being wound one time, and bends under the bending load f. The warped state is slightly exaggerated. When the winding shaft 1 continues to wind and rotate while maintaining its arched shape in one direction, both parts of the sheet S slide toward the lower side, that is, toward the center, resulting in wrinkles W in the center. It occurs.

Based on this understanding, the first idea is to strengthen the winding shaft to the extent that it does not bend due to sheet tension. However, unlike tensile and compressive strength, increasing bending strength is troublesome, and it is particularly difficult to strengthen the winding shaft of the most commonly used paper tube. In addition, the method of winding and then pulling out the core wire, which has an outer diameter that matches the inner diameter of the shaft hole over almost the entire length of the winding shaft, is disadvantageous in that the core wire becomes heavy and is inconvenient to handle. be. It is also conceivable to use a well-known air shaft as the winding shaft, but in this case there are drawbacks such as a complicated structure and an expensive air shaft itself, and it is not practical.

This invention does not adopt the above-mentioned common-sense measures, but rather supports the winding shaft from outside the sheet so that it does not bend during sheet winding, or supports the winding shaft in advance in the direction opposite to the direction of the bending load applied by the sheet tension. We adopted a method of curving in the same direction. First of all, in the former case, the newly added winding shaft support roller as a supporting means supports the bending load on the winding shaft due to sheet tension through the sheet layer wound around the first winding shaft, so the curvature of the first winding shaft is prevented. This completely eliminates sideways sliding of the sheet edge due to curvature, as well as the occurrence of wrinkles due to this. In the latter case, against the bending load applied to the winding shaft due to sheet tension.

Since the winding shaft is curved, the winding shaft, which is subjected to forces in opposite directions during winding, will not be curved by the above-mentioned load.

<Example> Figs. 1 to 3 and 6 to 8 show the first invention of the present invention, and Fig. 9 shows the flaw 2 invention.

FIG. 1 shows an embodiment in which the first invention is applied to the latest dividing winder. The sheet S passes through a pull-out driving roller 3 directly below the central touch roller 2, and is divided into required widths by a slitter 4. It is wound around a touch roller 2 that is driven at a variable speed with respect to the circumferential speed of the drive roller, and distributed to the left and right, and is wound around a winding shaft 1 located at the tip of the left and right winding arms 5, which is centrally driven by a drive mechanism (not shown). taken. FIG. 2 is a partial side view thereof.

In this case, the winding shaft support roller lO unique to the first invention is
Both ends are supported by the tips of left and right swinging arms 6.

It oscillates as the IA length of the sheet roll Sr increases. That is, when the sheet roll Sr moves to the position Sr' along the trajectory A due to growth, the support roller 10 moves to the position lO' along the trajectory B and supports the bending load f without interfering with the growth of the sheet roll. There is a risk that the sheet roll Sr may curve due to the load f only at the initial stage when the roll diameter is small; as the diameter increases, the bending resistance becomes stronger and the support roller 10 becomes unnecessary. The support 1 drive mechanism of this support roller IO will be explained with reference to the embodiment shown in FIGS.

As is well known, in a winding machine that can freely change the width of sheet division by a slitter, the winding arm 5 moves in the lateral direction in order to wind up each divided sheet. Therefore, since each swinging arm 6 supporting the winding shaft support roller 10 of the first invention also moves laterally, a sliding rail is provided parallel to the guide support stand 8 of the winding arm 5.

The lower end of the swinging arm 6 is pivotally supported on each sliding table 11 mounted thereon. The swing arm 6 and the support roller 10 swing around the pivot point 6a. And the support roller 1
0 is oscillated by a fluid pressure cylinder 7 that is pivotally supported on the same sliding table 11, and its operation can be done manually or by computer control. There are many ways to indirectly support the bending load f at all times while keeping the support roller 10 away from the sheet roll S, as shown in this embodiment.
The simplest method is to constantly press it against the circumferential surface with an appropriate pressure.

In this embodiment, when the inclination angle of the swinging arm 6 changes, the contact pressure between the support roller 10 and the sheet roll Sr changes even if the pressing force of the fluid pressure cylinder 7 is constant, so the bending load f does not change.
Although it may seem inappropriate to support
In reality, there is no need to apply the support roller 10 until the sheet roll Sr grows as large as Sr', and the support roller 10 completes its role after moving a little near the solid line position in Figure 1 and retreats to the 10'' position. Therefore, the support roller 10
It is sufficient if the sheet roll Sr is designed to be pushed with a force suitable for supporting the bending load f when is near the solid line position. However, depending on the implementation conditions, the operator or the like may decide whether to use the support rollers from the beginning to the end of sheet winding, or to use them only at the beginning of winding or when necessary.

The role of the support roller IO is to support the winding shaft L and the sheet roll Sr.
In order to prevent the winding from bending, it is sufficient to reduce or cancel out the bending that occurs in the winding shaft l due to the bending load f caused by the sheet tension.If more force is applied, the support roller 10 on the right side of FIG. Care must be taken because it acts largely in the direction of lifting the take-up arm 5 (contact pressure direction) and has an adverse effect on the take-up contact pressure control.

In that respect, the support mechanism of the support roller lO is
If the support roller 10 is directly pressed against the sheet roll Sr by the fluid pressure cylinder, there is no risk of lifting the take-up arm 5. Furthermore, as the sheet roll becomes thicker, the support roller 1O separates from the winding shaft 1. The trajectory of
By determining the direction of the bending load applied to the sheet roll and guiding and supporting the support roller IO along the trajectory, the contact pressure between the sheet roll and the touch roller will not be adversely affected, and the support roller will be It can be made to work effectively.

The winding shaft l in the embodiment shown in FIG. 1.2 is a so-called paper tube, and is the most common type in which pusher tips 12 are inserted into both open ends to support both ends and drive one side. Although there are other methods of supporting the paper tube, since the bending load f described above is applied to the winding shaft l itself, which is the paper tube, the paper tube bends as shown in an exaggerated manner in FIG.

The length of the support roller 10 shown in FIG. 2 is the sheet roll Sr.
is equal to q, but short rollers may be applied to two points in the center of the sheet roll Sr.
It is sufficient to prevent the bending of the sheet roll due to the sheet tension of
The support roller lG itself may also be provided to support the curvature of the sheet roll Sr and curve to a certain extent by -1.

A support roller with a thick center like the 7th ri4! If the contact surface with the sheet roll Sr is made straight when the above-mentioned curvature occurs using O, effective contact can be made without increasing the rigidity of the support roller, so the small diameter of the support roller can be reduced. It is possible to achieve a reduction in size and weight, and there is no risk of damaging the surface of the sheet roll at the end on the side of the support roller.

As mentioned above, when the support mechanism of the support roller 10 is attached to the winding arm 5, the force pressing the sheet roll Sr by the support roller 10 does not affect the winding contact pressure control, so it is less than the force required for canceling the bending load. Applying an extra large pressing force, the sheet roll Sr is artificially curved in the opposite direction to the curvature of the sheet roll Sr in FIG. 5, so that the rolled sheet S slides inward and outward.

It is also possible to spread out the wrinkles on the traveling seat.

The embodiment shown in FIG. 3 relates to a winding machine that divides and winds a sheet with a large uneven thickness that is particularly prone to vertical wrinkles at the beginning of winding. A nip roller 13 is provided for nipping the traveling sea) S. In other words, when winding such a sheet, at the beginning of winding, the sheet roll tends to have a locally large portion of the outside diameter, and at the same time, the sheet roll is subjected to contact pressure by the touch roller. . Then, the contact pressure concentrates on the portion with the large outer diameter, causing the sheet roll to bend in the direction of the contact pressure, making wrinkles more likely to occur. Furthermore, due to the existence of this nip roller 13,
The applicant developed the principle of suppressing the influence of uneven sheet thickness in 1933.
The detailed explanation will be omitted since it is disclosed in Japanese Patent Application No. 1980 entitled "Sheet winding machine" proposed on May 9, 2000.

In order to avoid the nip roller 13, the support roller swing arm 6' shown in FIG. 3 has a bent shape, but is functionally the same as the previous embodiment.

In the embodiment of FIG. 8, which was briefly mentioned earlier, the support roller 10
This relates to a sheet dividing winder in which a winding arm 5 is provided with a winding arm 5. In this case, the support arm 14 of the winding arm 5 on the right side in FIG. A rotating arm 15 is provided on the winding arm 5 so as to be pivotable about its tip end as a fulcrum.

A support roller lO whose support arm IB is slidably supported
supports the sheet roll Sr distributed to the left side. still,
When transporting the wound sheet roll upward in the diagram,
Swing the swing arm 15 so that the left support roller is out of the way.

FIG. 9 shows an embodiment corresponding to the second invention. In this embodiment, in order to bend the winding shaft 1 on which the sheet S is wound in the direction opposite to the direction of the bending load applied to the winding shaft by the sheet tension, a pair of concentric rotating supports 17 are provided that support both ends of the winding shaft 1.
．． 17 and a rotation support 18 which is inserted near the center of the winding shaft l and can rotate eccentrically from the rotation support 17, and the rotation support 17 and 18 are connected in series. A central shaft 19 is provided to extend through and support the central shaft 19. The central shaft 1B is attached to a rotation support 18 which is capable of eccentric rotation by bending the first winding shaft 1 in a direction opposite to the direction of the bending load applied to the winding shaft by sheet tension. Therefore, according to this embodiment, when a bending load is applied to the winding shaft due to the sheet tension associated with sheet winding, the central shaft 19 is deflected in the direction of the load, and the rotation support 17.1
8 are located almost concentrically. In other words, since the winding shaft 1 has an almost right cylindrical shape, the sheet can be wound properly. However, it is also possible to artificially bend the sheet roll in the direction opposite to the sheet tension, causing the rolled sheet to slide outwards and outwards, thereby widening the wrinkles in the traveling sheet.

Although the present invention has been described above using a small number of embodiments, the present invention can be varied and applied in a variety of ways according to the well-known techniques of machine designers depending on the implementation conditions without changing the gist thereof.

The target winding shafts are mainly paper tubes and synthetic resin tubes, which are easy to bend, but are not limited thereto.

The material of the support roller of the first invention may be metal or non-metal.
The surface may be covered with rubber or synthetic resin, or surface grooves may be formed. As mentioned above, the shape is free, such as one with the same length as the winding shaft, one that is short and presses only in the center, and one with a bulge. There are various support roller support mechanisms, such as those that move the roller back and forth toward the sheet roll, those that swing the roller, those that support both ends, and those that support one side.

Alternatively, the support roller may be placed in a fixed position and the sheet roll may grow in contact with the support roller.The power source for pressing the support roller against the sheet roll may be a fluid pressure cylinder, a spring, an electromagnetic force, gravity, or electric power.

It is also a good idea to use a torque control device such as a magnetic particle clutch to adjust the amount of pressing force.In the case of a winding machine that uses a touch roller to prevent air entrainment, the support roller support mechanism should be guided and supported by the touch roller support frame. You can also do it.

There are many different ways to use the touch roller of a winding machine, and the present invention can be applied to all of them by a general designer, including those that do not use a touch roller.

The sheet winding device includes a slitter winding machine in which a touch roller rotates due to friction as the sheet roll rotates, and a slitter winding machine in which a small diameter touch roller is provided for each sheet roll or for one roll of the sheet roll. A slitter winder in which the shaft is fixed and the touch roller swings or slides as the sheet roll thickens; the sheet roll and the touch roller are able to swing and slide relative to each other; The roller applies a predetermined pressing force to the surface of the sheet roll, and on the first roll side, the touch roller is moved away by swinging or other means to position it at a certain position. There are various types of machines, including a sheet rewinding machine that winds the sheet unwound from a sheet into a sheet roll of a predetermined diameter, and a winder that is directly connected to the sheet production line and continuously winds the sheet into a raw roll. It is not limited to the examples.

In the second invention, the bearing portion of the rotation support that supports both ends of the winding shaft is supported on the winding arm so as to be swingable in the bending load direction of the sheet tension, and the rotation support is connected to the fluid pressure cylinder, A spring or the like may be used to bias the winding shaft in a direction opposite to the direction of the bending load due to the sheet tension applied to the winding shaft.

<Effects of the Invention> The present invention has theoretically clarified the phenomenon in which vertical wrinkles occur at the beginning of winding of a flexible and slippery sheet.

As a result of elucidation, it was found that the cause of wrinkles was that the first roll shaft was bent by the sheet tension, but as a countermeasure, instead of adopting the simple method of strengthening the winding shaft, the sheet roll was It supports the outside and prevents it from curving, or it bends the winding shaft in the opposite direction to the direction of the bending load applied to the winding shaft by the tension of the sheet being wound. A unique method was adopted.

This makes it possible to prevent the winding shaft from bending due to sheet tension, even if the winding shaft is made of a paper tube or synthetic resin tube, which is more susceptible to bacteria than in the past. It is now possible to fundamentally eliminate the vertical wrinkles that occur in sheets.

[Brief explanation of drawings]

Fig. 1.2 is a front view and a partial side view of one embodiment of the first invention, Fig. 3 is a partial front view of another embodiment of the first invention, and Fig. 4 is an explanation showing the conventional wrinkle occurrence situation. Figure 5 is an explanatory diagram of the clarified cause of wrinkle occurrence. FIG. 6 is a side sectional view, and FIG. 7 is an explanatory diagram of another embodiment of the support roller of the first invention. FIG. 8 is a front view of still another embodiment of the first invention, and FIG. 9 is a partial side view of the second invention. 1... Winding shaft, 10... Support roller, 17.18...
- Rotation support, 19... central axis.

Claims (2)

[Claims] (1) In a winding device that winds a belt-shaped sheet onto a sheet roll using a centrally driven winding shaft, the sheet is wound around the winding shaft against the bending load applied to the winding shaft due to the tension of the sheet being wound. A sheet winding device comprising a support roller that rotates while supporting the outer surface of the roll. (2) In a winding device that winds a belt-shaped sheet onto a sheet roll using a centrally driven winding shaft, the winding shaft is bent in the direction opposite to the direction of the bending load applied to the winding shaft due to the tension of the sheet being wound. A sheet winding device characterized by: