KR20170039163A - Rewinding machine and method for producing logs of web material - Google Patents

Abstract

The power take-off includes first winding coils formed between the first winding roller 1, the second winding roller 3 and the third winding roller 7. The first winding roller and the second winding roller define a nip 5 through which the winding core A passes and around which the web material N is wound; The power take-off also includes the supply path of the winding core passing between the first winding-up roller 1 and the third winding-up roller 7. The second winding cradles are formed between the first winding roller (1), the second winding roller (3) and the fourth winding roller (8). The power take-off also includes a rolling surface 19 extending around the first winding roller 1 and defining a supply channel 21 of the winding core.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for producing logs of web materials,

The present invention relates to a web material, and in particular to a method and a machine for making rolls of paper, especially tissue paper logs, such as toilet paper, kitchen towels and the like.

In the field of paper making, in particular for the production of rolls of toilet paper, kitchen towels and the like, large reels (parent reels) of tissue paper which are introduced directly from the continuous machine are wound. These large reels are then unwound and rewound to produce rolls or logs of smaller diameter, corresponding to the diameter of the end product for consumption purposes. These logs have an axial length equivalent to a number of finished rolls for the purpose of distribution and sale, and are then cut by a cutter to obtain a finished product intended to be packaged and then sold.

In order to produce a log of web material, modern rewinding involves the use of a take-up roller which, in various combinations and arrangements and with a suitably controlled rotation, allows the log to be automatically produced in rapid sequence through the continuous supply of web material Use. At the end of the winding of the log, the log should be moved away from the winding area and the web material should be cut (by cutting, tearing, etc.) to allow initiation of winding of subsequent logs. Typically, winding is typically but not exclusively, but takes place around a winding core made of cardboard, plastic or other similar suitable material. In some cases, the winding takes place around an extractable and recyclable mandrel that is extracted from the finished log and reinserted into the license holder, i.e., after the authority is completed, to rewind the subsequent log.

In a more modern design winder, the winding motion is imparted to a log formed by contact with two or more rollers rotating at a controlled speed. These power take-offs are called peripherals or surface entrainment since the winding operation, i.e. movement, is imparted around by the contact between the surface of the winding roller and the surface of the log being formed. Examples of this type of automatic continuous surface finisher are disclosed in U.S. Patent No. 5,979,818, other patents in the same family, and patent documents cited in this patent. Improvements to the machines described in this US patent are described in WO-A-2011/104737 and WO2007 / 083336. In these prior art winders, the cutting of the web material is performed by a cutting, tearing or cutting member, which member cooperates with the fixed shaft take-up roller and web material is supplied around the roller, 2 With the take-up roller, a nip for inserting the winding core into the winding cradles is defined.

These machines also automatically and continuously pass each other from one log production to another at a substantially constant or substantially constant rate without the various stages of the winding cycle of each log interrupting the supply of web material, . The term automatic sequential activation is used in this description and in the appended claims to denote such a type of machine.

One of the important steps in the automatic continuous perimeter operation of the type described above is to perform a conversion step, that is, cutting the web material, ejecting the finished log, and moving a new log around the new winding core inserted into the winding cradle It is in the beginning stage of winding.

Various solutions automatically and rapidly perform these operations, for example, through the use of a rotating winding roller at a controlled speed that is synchronized to accelerate and / or decelerate synchronously to facilitate correct operation of the finished log and the new core, for example . In some cases, a tear system is provided wherein the web material is cut at the end of winding by a difference in speed. In other cases, pressurized air systems, suction systems, mechanical systems, etc. are used to perform cutting of the web material.

WO-A-2012/042549 describes a peripheral automatic entrainment with four rollers. The four rollers (all or at least some of which have a movable axis) allow for a more controlled and more effective control of the logs being formed by the two winding cradles. In some embodiments described in this document, the log being formed always contacts at least three winding rollers and in some cases may be temporarily in contact with four winding loops. This allows particularly effective control of the winding cycle, the shape of the log and the winding density to be obtained. In some embodiments, the web material is cut by stretching the web material path between the two take-up rollers. This stretching results in the breakage of the web material, forming a free leading edge that begins winding the free end edge of the complete log and the subsequent log on the new core. This machine has achieved notable results in terms of winding accuracy and operational reliability, but there are some aspects that can be further improved. In particular, the correct operation and reproducibility of the winding cycle may, in some cases, depend on the properties of the material being worked on, i.e. the web material and / or the winding core.

According to the present disclosure, there is provided a re-entrainment with four rollers, of an automatic continuous peripheral type, wherein the log of the web material is conveyed continuously, without interruption to the supply of web material, The web material is fed continuously and is provided in rapid sequence around the winding core, which includes a mechanism for cutting the web material at the end of each winding cycle in addition to the winding rollers.

It is understood that a continuous or substantially continuous feed is intended herein to have a feed rate wherein the web material is substantially independent of the winding cycle and other factors may change the feed rate of the web material more substantially . For example, it may be necessary to slow or even stop the feeding of the web material to the winding head if the web material is to be replaced, or if the web material is broken. However, this rate change or stop is not correlated with the winding cycle of a single log.

According to one aspect, an automatic continuous peripheral gripper for producing a log of web material wound around a winding core is provided, and the power take-off is provided between the first winding roller, the second winding roller, and the third winding roller And includes a first winding cradle. The first winding roller and the second winding roller define a nip, and the winding core passes through the nip and the web material is wound around the winding core. The power take-off may also include a winding core feed path between the first winding roller and the third winding roller. Advantageously, second winding coils formed between the first winding roller, the second winding roller and the fourth winding roller are also provided. The third winding roller is positioned upstream of the nip with respect to the feeding direction of the winding core through the nip, and the fourth winding roller is positioned downstream of the nip. The rewinding may include a rolling surface for the winding core that extends partially around the third winding roller. Between the rolling surface and the first winding roller, the insertion, i.e., the supply channel, is defined for the winding core. It is possible to define a supply path for the web material extending between the first take-up roller and the third take-up roller and between the first take-up roller and the second take-up roller. The rolling surface is constructed and arranged with respect to the first take-up roller so that the cores are supplied by rolling in contact with the rolling surface and the web material driven around the first take-up roller.

In the context of the present description and the appended claims, the term winding rollers are used interchangeably with motor driven rollers, paper rollers and other endless web materials, in particular in the field of conversion of web materials, That is, it is intended as a roller which rotates in the forward direction by the motor to transmit the winding operation to the log formed by the friction between the surface of the take-up roller and the log in contact with the take-up roller.

The arrangement of the winding rollers allows, for example, the winding of the web material by the cooperation of three winding rollers in contact with the log being formed. In addition, it is also possible to separate the first winding crayers with respect to the second winding cradle, by means of which the web material extending between the third winding roller and the first winding roller as well as through the nip between the first winding roller and the second winding roller The specific arrangement of the third take-up roller with respect to the insertion path of the core allows the take-up roller to have an appropriate size and also to process the winding core of small diameter.

In an advantageous embodiment, the rewinding comprises a web material cutting member configured and controlled to be cut at the end of the winding of the web material log in the second winding cradles. For example, the cutting member may be configured and controlled to cooperate with the first take-up roller.

In some embodiments, the cutting member is configured and controlled to cut the web material by pinching the web material against the first take-up roller to generate a tensile force on the web material that is greater than the breaking point of the web material.

In some embodiments, the rolling surface extends from the inlet of the winding core supply channel to the third winding roller. In this way, the winding core is inserted into the channel and fed along the channel by rolling around the first winding roller, wherein the web material is between the winding core being fed in the channel and the first winding roller. The path of the winding core then continues beyond the insertion channel between the first winding roller and the third winding roller and reaches the first winding cray.

In an advantageous embodiment, the rolling surface has interruptions through which the cutting member can penetrate the winding core supply channel to pinch the web material against the first take-up roller. For example, the rolling surface may be formed by a comb-like structure comprising a plurality of shaped lamina elements spaced from one another. The shaped edge of the lamina element forms the rolling surface for the core. The spacing between adjacent elements allows passage of the cutting member. The cutting member may include one or more pressers interposed between the laminar elements of the comb-like structure forming the rolling surface.

In some embodiments, the rolling surface can be divided into two parts. The first portion may be stationary with respect to the load-bearing structure. The second portion positioned downstream of the first portion with respect to the feeding direction of the winding core along the insertion channel is movable with the third winding roller.

In a possible embodiment, at least one of the first take-up roller and the second take-up roller controls the distance between the first take-up roller and the second take-up roller and the dimension of the nip between the first take-up roller and the second take-up roller And a movable shaft. In some embodiments, preferably both the first winding roller and the second winding roller have a movable shaft. The first winding roller and the second winding roller may have axes which move symmetrically with respect to the center line plane passing through the nip formed between the first winding roller and the second winding roller.

In another embodiment, the first take-up roller may have a stop axis while the second take-up roller has a movable axis to control the dimension of the nip between the first take-up roller and the second take-up roller.

The diameters of the four winding rollers could be different from each other. Advantageously, the first winding roller has a larger diameter than the second winding roller.

In some embodiments, the movement of the first, second, third and fourth winding rollers during formation of the log causes the first portion of the winding of the log to contact the first winding roller, the second winding roller and the third winding roller Happening in your logs; A second portion of the winding of the log is in contact with the first winding roller, the second winding roller, the third winding roller and the fourth winding roller to occur in the log; The third portion of the winding of the log is controlled to come into contact with the first winding roller, the second winding roller and the fourth winding roller to occur in the log.

According to a further aspect, there is provided a method of winding web material and sequentially forming logs of said web material around a winding core, comprising the steps of:

The first winding rollers between the first winding rollers, the second winding rollers and the third winding rollers, and the four winding rollers which define the second winding rollers between the first winding rollers, the second winding rollers and the fourth winding rollers Arranging the rollers;

Arranging a rolling surface extending around the first take-up roller and forming a feed channel for the take-up core therebetween;

Feeding the web material around the first winding roller;

Inserting the first winding core into the supply channel, inserting the first winding core along the insertion path between the first winding roller and the third winding roller, and inserting the first winding core into the first winding cradle;

Performing a first portion of the winding cycle of the first log around the first winding core in the first winding cradle;

Transferring a first log forming from the first winding cradle to the second winding cradle through the defined nip between the first winding roller and the second winding roller;

Performing a second portion of the winding cycle of the first log within the second winding cradle;

At the end of the winding of the first log in the second winding cradle, a second winding core is inserted into the supply channel along the insertion path extending between the first winding roller and the third winding roller, And inserting a second winding core into the second winding core.

In some embodiments, the method further comprises pinching the web material between the second winding core and the first winding roller by inserting a second winding core against the first winding roller, and pinching the web material between the first winding roller and the second winding core, And cutting the web material between the first winding core and the second winding core.

The method includes providing a web material cutting member; And generating a leading edge that begins to wind the second log around the trailing edge of the first log and the second winding core by acting on the web material through the cutting member to cut the web material . The two edges can be generated between the first log and the second core near the completion of winding.

In some embodiments, the method may include one or more of the following steps: arranging the rolling surface defining the insertion channel for the winding core between the first winding roller and the rolling surface, around the first winding roller Wherein the rolling surface extends from the inlet of the insertion channel for the winding core to the third winding roller; Inserting a second winding core into the insertion channel and rolling along the insertion channel in contact with the rolling surface until it reaches the third winding roller to supply the second winding core and drive the web material around the first winding roller step; Passing a second winding core between the first winding roller and the third winding roller; And inserting a second winding core around the second log into the first winding cradle.

A possible embodiment of the method according to the invention provides the following steps:

a) inserting a first winding core in contact with the web material carried around the first winding roller and in contact with the rolling surface, towards the first winding cray;

b) fixing the leading edge of the web material to the first winding core;

c) winding a portion of the log of web material while retaining the first winding core in the first winding cradles and supplying a first winding core toward the second winding cray;

d) passing the first winding core wound around the log through the nip between the first winding roller and the second winding roller, and transferring the first winding core formed around the log into the second winding cradle And completing the winding of the web material in the second winding cradle;

e) inserting the second winding core through the first winding cradles, in contact with the web material and the rolling surface carried around the first winding roller;

f) cutting the web material forming the leading edge of the web material with a cutting member and ejecting a log of web material from the second winding cray;

g) repeating steps (b) - (f) to further form a log around the second winding core without interrupting the supply of web material.

A further embodiment of the method according to the invention may comprise the following steps:

a) arranging a third winding roller in an initial position for obtaining a first winding core;

b) bringing the first winding core into contact with the guided web material around the first winding roller and moving it toward the first winding cray;

c) fixing the leading edge of the web material to the first winding core;

d) feeding a first winding core between the first winding roller and the third winding roller into the first winding cradle and winding a part of the log of the web material in a state in which the first winding core is held in the first winding cradles And feeding a first winding core toward the second winding cray;

e) passing the first winding core being formed around the log through the nip between the first winding roller and the second winding roller, and moving the third winding roller from the initial position to the nip between the first winding roller and the second winding roller And following the logs in operation in the cradles toward the second cradles being formed in the first cradles;

f) transferring a first winding core forming around the log into the second winding cradle;

g) completing winding of the log of web material in the second winding cradle;

h) returning the third winding roller to an initial position;

i) contacting a second winding core with a web material carried around the first winding roller;

j) cutting the web material forming the leading edge of the web material by the cutting member with the third take-up roller in an initial position and ejecting a log of web material from the second take-up cray;

k) repeating steps (c) - (j) to form an additional log around the second winding core without interrupting the feeding of the web material.

In a still further embodiment, the method may comprise the following steps:

Arranging a rolling surface around the first take-up roller to form a supply channel of the first take-up roller and the take-up core;

Inserting a new winding core into the supply channel at the end of winding of the log in contact with the rolling surface and the web material carried around the first winding roller and angularly accelerating the winding core in the supply channel;

Inserting the cutting member into the supply channel downstream of the new take-up core and breaking the web material between the new take-up core and the log in the vicinity of the completion of the take-up in the second take-up cray.

BRIEF DESCRIPTION OF THE DRAWINGS The invention will be better understood from the accompanying drawings and the following detailed description which illustrate non-limiting embodiments of the invention. More specifically, in the figure:
Figs. 1 to 5 schematically illustrate a first embodiment of a power take-off according to the present invention in an operating procedure; Fig.
6 is a diagram of a system of a motor-driven center for guiding a winding core;
FIG. 7 is a sectional view taken along line VII-VII in FIG. 6;
Figure 8 shows the position of the system of Figures 6 and 7 with respect to a cluster of winding rollers; And
9 is a view showing a further embodiment of the power take-off according to the present invention.

Figs. 1 to 5 illustrate the operation of the continuous operation of the present invention, and in particular the conversion step, that is to say, the operation step of drawing a completed winding log and inserting a new winding core for initiating the formation of a subsequent log Fig.

Figures 1 to 5 show the main elements of the occupancy limitation, which is limited to what is necessary to understand the concept on which the present invention is based and the mode of operation of the occupancy. The details of construction, auxiliary units and further components which may be designed according to known and / or conventional techniques are not shown in the drawings or are not described in further detail. Those skilled in the art will be able to provide these additional components based on experience and knowledge in the field of paper conversion machinery.

In summary, in the embodiment shown in the present specification, what is denoted as (2) as a whole is a first take-up roller 3 having a rotation axis 1A arranged side by side with a second take-up roller 3 having a rotation axis 3A, (1). The axes 1A and 3A are substantially parallel to each other. A nip 5 is defined between the two winding rollers 1 and 3 and the web material N is supplied through the nip (at least during part of the winding cycle of each log) And logs L1 and L2 are formed around these cores. The path of the web material N extends around and partially surrounds the first take-up roller 1 such that the web material N contacts the cylindrical surface of the take-up roller 1 against a predetermined contact arc, May vary during the winding cycle as will be apparent from the description of the winding process.

As will be apparent from the following description in this specification, the winding core also passes through the winding nip 5 during the intermediate stage of the winding cycle.

The winding cores A1 and A2 are wound around the nip 5 into the winding rollers by the first winding rollers 1 and by the second winding rollers 3 and by the third winding rollers 7 1 cradle (6). Reference numeral 7A denotes the rotation axis of the third winding roller 7 which is substantially parallel to the axes 1A and 3A of the first winding roller 1 and the second winding roller 3, respectively.

When the winding core is positioned in the second winding cradle 10 located downstream of the nip 5 with respect to the feeding direction of the winding core in the winding head formed by the winding rollers, Lt; / RTI > The second winding cradles are formed by the first winding roller 1, by the second winding roller 3, and by the fourth winding roller 8. Reference numeral 8A denotes the rotation axis of the fourth take-up roller 8, which is substantially parallel to the axis of the take-up rollers 1, 3, 7. And reference numeral 12 denotes a pair of arms pivoted at 12A to support the fourth winding roller 8. [ The double-headed arrow f12 represents the swing motion of the arm 12, and thus the fourth take-up roller 8, that is, the reciprocating rotational motion. By moving around the fulcrum 12A, the take-up roller 8 is moved toward or away from the defined nip 5 between the first take-up roller 1 and the second take-up roller 3 .

In an alternative embodiment, the fourth winding roller 8 may be carried by a system of slides moving on a linear guide, instead of the arm pivoted about the pivot axis. In this case as well, the translation along the linear guide allows the winding roller 8 to move towards and away from the nip 5.

In this description and in the appended claims, the definitions of "upstream" and "downstream " in reference to the position of the winding rollers refer to the axial direction of the winding core and the feeding direction of the web material, unless otherwise specified.

The third winding roller 7 provides movement toward and away from the winding nip 5. For this purpose, in some embodiments, the third winding roller 7 has a pair of arms pivoted about the axis 9A to oscillate, i.e., rotate, in a reciprocating motion, in accordance with the bi-directional arrow f9 (9). In another embodiment not shown, the third winding roller 7 can be supported by a slide moving on the linear guide, for example, along the trajectory of the linear motion.

A core feeder or inserter 11, which can be made in any suitable manner, is arranged upstream of the first take-up roller 1 and the second take-up roller 3 of the take-up nip 5, A single winding core (A1, A2) is inserted towards the first winding cray as described in more detail with reference to the procedure of Figure 5.

The winding core may be derived from a machine for forming a winding core associated with a line of conversion of a web material N into which a winding machine 2 is inserted, not shown, from a "core winding machine ".

In some embodiments, the rewinding includes a rolling surface 19 for the winding core. The rolling surface 19, when in the position of Fig. 1, can have a generally cylindrical shape that is substantially coaxial with the first take-up roller 1 with the movable shaft. The rolling surface 19 may have a step 19G at an intermediate position of its extension. The rolling surface 19 can be divided into a first portion 19A and a second portion 19B and the first portion is located upstream of the second portion with respect to the feed direction of the web material N. [

The cylindrical surface and the rolling surface 19 of the first winding roller 1 form a supply channel 21 for the winding cores A1 and A2. 1 to 4, the height of the supply channel 21 for the winding core can be smaller than the first portion of the supply channel, and the height of the second Can be bigger in the part. The purpose of this change in the height of the feed channel 21 is to allow each new winding core A1, which is inserted into the feed channel 21 by an inserter or feeder 11, A2 to facilitate the start of the rolling motion. In particular, in the first part of the feed channel 21, the height of the feed channel, i.e. the distance between the winding roller 1 and the rolling surface 19, may be smaller than the diameter of the winding cores A1, A2.

In some embodiments, the rolling surface 19 is formed in a comb-like structure by a plurality of arcuate plates arranged side by side, and a free space is formed between these plates. Through these free spaces between adjacent plates forming the rolling surface 19 a cutting member of web material N, indicated generally at 23, can be inserted. In some embodiments, the comb-like structure forms a first portion 19A of the rolling surface and can be stationary, i.e. fixed, with respect to a support structure not shown. In some embodiments, the second portion 19B of the rolling surface can be formed by an element 19C that moves in the axis 7A of the third winding roller 7, following this latter movement.

Element 19C may also be plates forming a comb-like structure.

In another embodiment, the surface 19B is formed by a single arcuate plate extending in a translational manner with respect to the feeding motion of the web material, i.e. parallel to the axis of the winding rollers 1, 3, 7 .

In some embodiments, the cutting member 23 includes a presser, which includes a plurality of presser members 24, for example. The cutting member 23 can be provided with a reciprocating rotational motion about a shaft 23A substantially parallel to the axis of the winding rollers 1, Reference numeral f23 denotes movement of the cutting member 23. [ Each presser member may have a pressure pad 24A. The pressing pad 24A may be made of, for example, an elastic yielding material having a high coefficient of friction, for example, rubber, for example.

The cutting member 23 is moved along the surface 24A of the presser member 24 and the first winding 24A of the presser member 24 in a manner synchronized with the movement of other members of the power take- Is pressed against the first winding roller (1) to pinch the web material (N) between the surfaces of the roller (1). The latter can have a surface with an annular band with a high coefficient of friction and an annular band with a low coefficient of friction. In this context, the terms "high" and "low" are intended to represent the relative values of the coefficient of friction of alternating annular bands of the two series. The band with a low coefficient of friction can advantageously be arranged in the area where the pad 24A of the presser members 24 is pressed. In this way, when the web material N is pinched against the first winding roller 1 by the presser members 24, it is stopped by the pad 24A and is stopped by the first winding roller 1 It tends to slide on an annular band with a low coefficient of friction.

Fig. 1 shows the final stage of the winding cycle of the first log L1. 1, during this stage of the winding cycle of the first log L1 around the first winding core A1, the log L1 is wound around the first winding roller 1, the second winding roller 3 And the second winding cradle 10 in contact with the fourth winding roller 8. [ The web material N is fed along the arrow fN around the first winding roller 1 through the nip 5 between the first winding roller 1 and the second winding roller 3 and the roller 1 , 3 and 8, thereby being held in the winding cradle 10. [0033] Reference numeral 27 denotes a guide roller of the web material N positioned upstream of the winding head defined by the winding rollers 1, 3, 7,

Preferably, the feed rate of the web material N is substantially constant. A winding cycle is carried out at a constantly changing rate of the silver winding speed and at a constant feeding speed of the web material towards the cluster of winding rollers, in particular towards the first winding roller 1, Is intended as a result of factors independent of the operations performed by the elements of the winding head described above, which are controlled to insert a new core and initiate winding of a new log.

During the winding of the log L1, the peripheral velocities of the winding rollers 1, 3, 7 and 8 are substantially equal to each other, except for the switching step which forms the transient step in the operation of the winding.

The various winding rollers all rotate in the same direction as indicated by arrows in the drawing. In this case, substantially the same means that the speed is sufficient to compensate for the denseness of the windings and the windability of the windings, in order to offset, for example, the change in tension that could be caused by the movement of the center of the log being formed along the path between the wind- The tension of the web material N between the take-up roller 7 and the take-up roller 8 can be limited.

In some embodiments, this difference between the peripheral velocities of the winding rollers may typically be comprised between 0.1 and 1%, preferably between 0.15 and 0.5%, for example between 0.2 and 0.3% And it is understood that it is not a limitation.

In addition, the peripheral speed may be slightly varied to cause a forward movement of the forming log, as will be seen below, in order to pass from the first winding cradle 6 to the second winding cradle 10.

The winding cycle of the log is as follows.

1, the log L1 in the winding cradle 10 formed by the rollers 1, 3 and 8 is actually completed with the necessary amount of winding of the web material N around the first winding core A1 have. The amount of wound web material can be determined by the winding length. The second winding core A2 is provided by a winding core feeder or inserter 11 at the inlet of the feed channel 21. [

Reference numeral C denotes a dot or a continuous line of the adhesive applied to the outer surface of the second winding core A2.

2 shows the discharge of the completed log L1 into the winding head formed by the switching steps, i.e. the rollers 1, 3, 7, 8 and the start of the insertion of the new winding core A2.

The second winding core A2 is inserted by the winding core feeder or inserter 11 into the inlet of the feed channel 21 defined between the first winding roller 1 and the rolling surface 19.

At this stage of the winding cycle, the position of the first winding roller 1 is substantially coaxial with the rolling surface 19, which is generally and approximately cylindrical. The distance between the cylindrical surface of the first winding roller 1 and the portion 19A of the rolling surface 19 is slightly smaller than the diameter of the winding core A2. In this way, the winding core A2 that enters the supply channel 21 is pressed against the web material N driven around the first winding roller 1.

This pressure is applied between the surface of the winding core A2 and the rolling surface 19 and between the surface of the winding core A2 and the web material N carried around the cylindrical surface of the first winding roller 1, . This is because the winding core A2 is accurately accelerated as a result of the rotation of the first winding roller 1 and the supply of the web material N and the web material N and the web material N are pressed To be pushed by the first take-up roller (1) which is located on the roll surface (19).

The radial dimension of the feed channel 21 may gradually increase along the second portion 19B of the rolling surface 19 and thus reduce the deformation of the diameter of the winding core A2, (N) and, as a result, to enable the formation of a new log turn.

The step 19G, if provided, can facilitate the initial angular acceleration phase of the winding core A2.

The line of the adhesive C applied to the winding core A2 comes into contact with the web material N so that the winding core A2 is brought into contact with the web material N during the rolling movement of the winding core A2 in the supply channel 21. [ Causing adherence.

At this stage of the winding cycle, the cutting or breaking of the web material N is also caused by the cutting member 23. The latter is pivoted by the pad 24A against the first take-up roller 1 so as to pinch the web material N against the surface of the first take-up roller 1. As the winding rollers 1, 3 and 8 continue to rotate and take up the web material N on the log L1 the web material is conveyed by the first winding roller 1) of the web material (N).

If the tension exceeds the breaking point at the perforation line of the web material N for example, this breaking point is broken and the trailing edge Lf wound on the log L1 and the trailing edge Lf wound on the new winding core A2 Thereby generating a leading edge Li. The leading edge Li and the trailing edge Lf are schematically shown in Fig. In this embodiment of the winding method, when the cutting of the web material N is carried out, the winding core A2, that is, at the stepped portion 19G, furthermore the insertion channel 21 of the winding core A2 Passes through a small radial dimension. In another embodiment, the cutting of the web material N may occur before or after passing the winding core A2 over the stepped portion 19G.

In some embodiments, the winding may be performed by electrostatic charging of the web material N and / or the winding core A2, for example, without the use of the adhesive C, RTI ID = 0.0 > A2). ≪ / RTI > In another embodiment, coiling may be initiated with the aid of an air jet. In yet another embodiment, the beginning of winding can be obtained or facilitated through proper control of the movement of the cutting member 23. [ For example, the cutting member can be controlled to form a loop of web material N wound around the winding core.

1 to 5, the movement of the cutting member 23 is alternately reciprocating, while in other embodiments the movement of the cutting member 23 can always be in the same direction, e.g. clockwise in the figure. The speed of the cutting member can be adjusted by the pads 24A by rotating the cutting member 23 at a speed such that the pad 24A is fed at a lower speed than the peripheral speed of the first take- Can be controlled to cut or break the web material between the pinch point of the web material (N) and the log (L1). In another embodiment, the speed of the pad 24A may be greater than the peripheral speed of the first take-up roller 1. In this case, the cutting or breaking of the web material N is performed by the pinch point of the web material N by the pad 24A and the web material N between the first winding roller 1 and the new winding core A2. The pinch point of the pinch point.

In another embodiment, not shown, the cutting member may be configured differently, for example, using a blade cooperating with a counter-blade on the first take-up roller 1 to perform cutting of the web material have. In another embodiment, the cutting of the web material may be obtained by a cutting member received in the first take-up roller 1 or between the latter and the path of the web material N, To cut web material that acts from the side of the web material (N) facing the web material (N).

Figure 4 shows that the second winding core A2 being rolled along the rolling surface 19 leaves the rolling surface 19 and the third winding roller 7 located at the end of the insertion channel 21 for the winding core, Lt; RTI ID = 0.0 > a < / RTI >

The third winding roller 7 may be provided with a series of annular grooves 7S into which the end of the plate forming the end portion 19B of the rolling surface 19 is inserted. In this way, the winding core A2 is gradually transferred from the rolling surface 19 to the surface of the third winding roller 7.

By rolling on the surface of the third winding roller 7 and keeping it in contact with the web material N driven around the first winding roller 1, the winding core A2, or more precisely, The new log L2 is also brought into contact with the second winding roller 3 as shown in Fig. Therefore, in practice, the path of the winding core is formed between the first winding roller 1 and the third winding roller 5 and through the nip 5 between the first winding roller 1 and the second winding roller 3 .

The cutting member 23 is rotated about the axis 23A until it exits the feed channel 21 in order to allow the supply of the winding core A2 along the feed channel 21. [ Since the adhesive C (or other means or element for starting winding) causes the attachment of the web material N to the winding core A2, the web material is formed such that the winding core A2 rolls along the channel 21 And starts winding on the winding core A2 to start the formation of the second log L2.

During the above described operation, the first log Ll initiates the ejection movement from the second winding cradle 10, for example as a result of a change in the peripheral speed of the rollers 1, 3 and 8. In some embodiments, the fourth winding roller 8 may be accelerated and / or the second winding roller 3 may cause the log L1 to move away from the second winding cradle 10 to a discharge chute 31). ≪ / RTI > The fourth take-up roller 8 moves upward to allow the passage of the log L1 toward the discharge chute 31.

4, the second winding core A2 is located in the first winding cradle 6 and is in contact with the first winding roller 1, the second winding roller 3 and the third winding roller 7, A second log (L2) is formed around the second log (L2). The completed log (L1) is discharged on the chute (31). The second winding core A2 passes through the defined nip or space between the first winding roller 1 and the third winding roller 7 before coming into contact with the second winding roller 3. [ Then, as described below, the winding core A2 in which the log L2 is formed also passes through the nip 5 between the first winding roller 1 and the second winding roller 3.

The formation of the second log L2 continues through the supply of the web material N around the new winding core A2 and as a result increases the diameter of the new log L2. The third winding roller 7 can move due to the movement of the arm 9 about the fulcrum or shaft 9A and is accompanied by an increase in the diameter of the second log L2. The portion 19B of the rolling surface 19 is located in the vicinity of the nip 5 between the first winding roller 1 and the second winding roller 3 so as not to interfere with the movement of the third winding roller 7 It is possible to follow the movement of the third winding roller.

After performing a part of the winding cycle in the cradle 6, the log L2 is moved to the second winding cradle 10 where the winding of the log is completed. For this purpose, it is necessary to pass the log L2 through the nip 5. To accomplish this, in some embodiments, one or both of the winding rollers 1 and 3, preferably both, are pivoted about the oscillation axes 1C and 3C, for example, As shown in Fig.

5, the distance between the centers of the winding rollers 1 and 3 is set to, for example, the distance between the arms 1B and 1B, as shown in Fig. 5, which shows an intermediate step from the winding cradle 6 to the winding cradle 10. [ 3B). In another embodiment, the winding rollers 1, 3 may be carried by a slide provided with a translational motion, instead of a swiveling or rotating motion.

(Fig. 5) that are away from each other, whichever mechanism is used to vary the distance between the centers of the winding rollers 1 and 3, causes the log L2 to pass through the nip 5 into the winding cradle 10 Allow to enter.

In some embodiments, during this step, the third take-up roller 7 may move gradually toward the second take-up cradle 10, which involves the log L2. In this way, the winding continues to come into contact with at least three winding rollers 1, 3, 7.

The fourth take-up roller 8 which ascends to allow the growth of the log L1 and which accompanies its discharge toward the chute 31 is moved to the nip 5 until it comes into contact with the log L2 supplied through the nip 5. [ (5). For part of the winding cycle, the log L2 can contact all four winding rollers 1, 3, 7 and 8.

The third winding roller 7 can move toward the nip 5 carrying the log L2 until it passes beyond the nip between the rollers 1 and 3. From this point, the log L2 can only come into contact with the rollers 1, 3 and 8 and terminate the winding in the second winding cradle 10. [

The supply movement of the axes of the logs L2 can be appropriately obtained by controlling the movement of the winding rollers and by changing the mutual positions of these axes, the log L2 can be moved to the minimum distance between the rollers 1 and 3 Into and through the region of the < RTI ID = 0.0 > For example, the movement can be obtained by pushing the log with the third winding roller 7. In some embodiments, the movement of the log can be facilitated, sustained or influenced through a temporary change in the peripheral speed of the take-up roller, for example, by reducing the peripheral speed of the second take-up roller 3 for a short period of time have.

5 includes a step in which the log L2 comes into contact with the four take-up rollers 1, 3, 7 and 8, but in another embodiment, the third take- Passing through the nip 5 beyond the minimum distance between the first and second rollers 1 and 3 and losing contact with the log L2 before contacting the fourth winding roller 8. However, in the illustrated embodiment, since the log is always in contact with at least three winding rollers, better control of the log is obtained in various forming steps.

The time at which the second winding core A2 is held in the position of Fig. 5, that is, in the winding cradle 6, can be shortened by acting on the peripheral speed of the winding rollers 1, 3 and 7 and / Lt; / RTI > The second winding core A2 will be held at this position substantially without additional supply during the entire time that the peripheral speeds of the winding rollers 1, 3 and 7 remain equal to each other. As mentioned above, the following advancement is obtained, for example, by decelerating the second take-up roller 3. Thus, if necessary, the amount of web material N wound around the winding core A2 is set and the second log L2 (L2) formed around the latter in the winding cradles 1, 3, ). ≪ / RTI >

Once the log L2 is located in the second winding cradle 10, the winding of the second log L2 continues until the condition of Fig. 1 is reached. The third take-up roller 7 which can be moved toward the nip 5 to accompany the movement of the log L2 through the nip in the second take-up cradle 10 is shown in Figure 1 As shown in FIG.

In some embodiments, the structure of this member of the rewinding operation is such that from the time of contact with the three take-up rollers 1, 3 and 7, the rolls lose contact with the take-up roller 7, The path followed by the centers of the winding cores A1 and A2 is substantially straight. This may be achieved, for example, by combining the peripheral winding method with axial or central winding, as described in U.S. Patent 7,775,476 and publication US-A-2007/0176039, Facilitates the use of a center that can be inserted into the opposite ends of the winding core to improve control and allows more regular winding.

The first and second winding rollers 1 and 3 having a relatively large diameter are wound by the described arrangement of the four winding rollers and the path of the winding core between the first winding roller 1 and the third winding roller 7 So that even when the winding core has a small diameter, the intermediate supporting portion is not required. The control of the small diameter winding core is nevertheless ensured by the relatively large diameter winding rollers 1 and 3 since the third winding roller 7 can be provided with a small diameter. The low bending stiffness of the third take-up roller 7 due to the smaller diameter of this roller can be offset using one or more intermediate supports. In some embodiments, the third take-up roller 7 is arranged so that the third take-up roller 7 is located at a position where the beam does not interfere with the path of the web material N and with the logs L1, May be connected to a support and stiff beam extending parallel to the plane 7A. This beam can be applied to the web material N and / or to the forming logs L1, < RTI ID = 0.0 >Lt; RTI ID = 0.0 > L2. ≪ / RTI >

In the embodiment shown in the accompanying drawings, the first take-up roller 1 and the second take-up roller 3 have substantially the same diameter, and both have a configuration in which a log being formed around each take- To increase or decrease the dimension of the nip (5). In another embodiment, the take-up roller 1 may be provided at a different diameter than, for example, the take-up roller 3. By increasing the diameter of the take-up roller, the support system of the roller can be simplified because a larger opposing dimension gives greater flexural rigidity.

Moreover, in some embodiments, only one of the two winding rollers 1 and 3 may have a movable axis, while the other has a fixed axis. In this way, the number of actuators required for movement of various members of the power take-off is reduced, and the law for controlling the movement of the winding roller is also simplified. When the two winding rollers 1 and 3 have different diameters, it is preferable that the winding roller of a larger diameter, for example, the winding roller 1 has a fixed shaft while the winding roller of a smaller diameter has the movable shaft Do. In this configuration, the winding process of the web material around the winding core does not change. The winding starts at the winding cradle 6 and ends after the passage of the log being wound through the nip 5 in the second winding cradle 10.

In a still further embodiment, the winding rollers 1 and 3 can both be movable, but can perform asymmetric movements.

In some embodiments, the rewinding described above includes the winding cradles 6 defined by the rollers 1, 3 and 7 upstream of the nip 5 and the rollers 1, 3 Guided and controlled the winding core during at least a part of their movement between the winding cradles 10 formed by the winding cradles 10,

The center system may include a center 101 for engaging the respective ends of the winding cores A1, A2 inserted into the winding area on each side or side member of the rewinding machine. Figures 6 and 7 illustrate one of these centers and associated actuating mechanisms.

The center 101 may have a rod 103 that terminates at the head 105. The head 105 may have a mechanism for engaging the tubular wound core. In some embodiments, the head 105 can be engaged by the winding core by being inserted therein. The head 105 may have an inflatable member for torsionally engaging the winding core. In some embodiments, the inflatable member includes an inflatable annular member 107 that is pneumatically inflatable, for example, through a compressed air supply system. The compressed air can be conveyed through the duct 109.

The center 101 may be provided with translational motion along arrow f101 parallel to the longitudinal axis X-X of the center.

An actuator, for example, a piston-cylinder actuator 111, may be used to control the reciprocating translational movement along the bi-directional arrow f101. This movement is repeated until the head 105 of the opposed center 101 on both sides of the power take-off is in contact with the winding core A1, A2 until the head 105 is engaged with the ends of the respective winding cores A1, To move toward each other. The head 105 may be partially or completely penetrating the ends of the winding core.

6, each center 101 may be provided with a motor 115, for example an electronically controlled electric motor, which is connected to a respective center 101 ). This movement can be transmitted from the motor 115 to the center 101 by a belt 117, for example a serrated belt. The toothed belt 117 can be driven around the torsionally regulated pulley 119 in the rod 103 of each center 101. More specifically, the pulley 119 can be fitted on the sleeve 121, the rod 103 of the center 101 can slide along the double-headed arrow f101, Is torsionally coupled to the rod 103 through, for example, a groove forming contour or the like. The sleeve 121 can be supported by the bearing 123 within a bushing 125 that can be carried by the slide 127.

The slide 127 may be mounted on the stop guide 129, i.e., integral with the load-bearing structure of the rewinder. In this way, the slide 127 can be translationally moved along the bi-directional arrow f127 in the direction determined by the guide 129. [ In some embodiments, a linear alternating motion according to (f127) may be imparted by a motor 131, for example, an electronically controlled electric motor. The electric motor 131 may cause oscillation of the crank 133 and the movement thereof is transmitted to the slide 127 through the connecting rod 135 and the connecting rod 135 is moved from the 135A to the slide 127 And is hinged to the crank 133 at 135B.

The movement in accordance with the bi-directional arrow f127 is such that during the winding process described above the winding core is moved from one of the two winding cradles defined by the set of three rollers 1, 3, 7 and 1, 3, 8 And may be substantially straight and parallel to the movement of the centers of the winding cores A1, A2 when they pass to the other side. The center 101 can be engaged with the winding cores A1 and A2 when the winding core is in the winding cradle 6 upstream of the nip 5 and can be engaged from the core It can be disengaged, so that the latter discharge is permitted in accordance with the above description with specific reference to the steps shown in Figs. 3 and 4.

During the movement in accordance with the double-headed arrow f127, more particularly during the step of upward movement of the center 101 (in the figure), they carry the winding core, while the log L1 increases in diameter, Of the torsional coupling between the head 105 of the center 101 and the winding cores A1 and A2 is provided by a belt 117 which imparts rotational motion to the center 101 which is transmitted to the winding core, As a result, it is delivered to the log being formed. The rotational speed imparted by the motor 115 can be controlled to be consistent with the peripheral speed of the log L1 being wound.

The use of the center 101 is advantageous in that it can be used in a more favorable manner in the formation of cradles of logs L1 from one of the two winding cradles 6, 10 to the other and through the nip 5 during all stages of the winding cycle Allow control.

1 to 8, the first winding roller 1 and the second winding roller 3 may have substantially the same diameter, and both of them may have the same diameter in the first winding step, (6) to the second winding cradle (10). In another embodiment, the first winding roller 1 and the second winding roller 3 may have different diameters, and preferably the first winding roller 1 is larger than the second winding roller 3 Diameter.

In a possible embodiment, one of the winding rollers 1 and 3 may have a fixed shaft, and the other may have a movable shaft.

Preferably, the first winding roller 1 around which the web material N is wound and guided can have a fixed shaft and can have a larger diameter than the second winding roller 3. [

Figure 9 shows a configuration of this type. The same reference numerals denote the same or equivalent parts as those described with reference to Figs. Particularly, the four winding rollers are represented by (1), (3), (7) and (8). A channel 21 for insertion of the winding cores A1 and A2 is formed around the first winding roller 1. [ The channel is defined by the rolling surface 19 extending from the first winding roller 1 toward the third winding roller 7 and by the cylindrical surface of the first winding roller 1. The winding core is inserted into the channel 21 so as to come into contact with the rolling surface 19 and with the web material N carried around the first winding roller 1. The rolling surface 19 is provided to facilitate angular acceleration of the winding core and grip of the web material after cutting resulting in the manner as already described above by the cutting member 23 of the web material N ) May be provided. This cutting member 23 of the web material cooperates with a first winding roller 1 which pinches the web material between one or more pressers 24A carried by the cutting member 23 and the first winding roller.

The rotation axis 1A of the first winding roller 1 can control the supply of the web material N to the nip 5 between the first winding roller 1 and the second winding roller 3 more stably and more easily So that it is in a stationary state with respect to the load-bearing structure of the power take-off machine (1).

In this embodiment, the second winding roller 3 has a diameter substantially smaller than the diameter of the first winding roller 1. For example, the diameter of the second take-up roller 3 may be less than half the diameter of the first take-up roller 1. The second winding roller 3 can be supported by the transverse side members 4, as schematically shown in Fig. Between the transverse side members 4, an intermediate support part can be arranged, which supports the second take-up roller 3 at an intermediate position between the latter ends. In this way, it is possible to design the second winding roller 3 having a small diameter.

In order to obtain sufficient stiffness of the second winding roller 3, the side members 4 and any intermediate support can be limited with respect to the transverse beam 14.

The shaft 3A of the second winding roller 3 is movable and pivotable about the pivot axis defined by the pivot point 16 of the side members 4 with respect to the load bearing structure of the power take- . The turning motion of the second take-up roller 3 can be controlled by the motor 18 associated with the crank 20. The connecting rod, which is also pivoted at 22B to each side member 4, can be pivoted at 22A with respect to the crank 20. The reciprocating rotational motion of the motor 18 pivots the axis 3A of the second take-up roller 3 about the axis defined by the turning point 16. In some embodiments, two symmetrical motors 18 may be provided to act on two opposing side members 4. Between the side members 4, the chute 31 or a part thereof can be fixed, so that the chute 31 can follow the movement of the second winding roller 3.

The third winding roller 7 is conveyed by the side members 32 which are limited with respect to the transverse beam 34 and pivot at the pivot point 36 relative to the stop structure of the power take- The intermediate support can be integrated with the transverse beam 34 to support the third take-up roller 7 at an intermediate point between its opposite ends supported by the side members 32. The translational movement of the third winding roller 7, that is to say its rotational axis 7A, which follows the movement of the winding core and of the forming core, is controlled by a connecting rod- May be imparted by the motor (42) by the system (44, 46).

The portion 19C of the rolling surface 19 can be limited with respect to the side member 32 and this portion can thus follow the translation of the third winding roller 7 during various stages of the winding cycle .

The operation procedure of the license holder 2 of Fig. 9 is substantially the same as that described with reference to Figs. 1 to 5, and will not be described in detail. 9 shows the completed log L1 ready to be discharged from the second winding cradle 10 and the second winding core A2 already inserted into the one winding cradle 6 between the winding rollers 1, ). The operating conditions shown in FIG. 9 may actually occur in this occupancy, but this is not indispensable. Depending on the adjustment type, an instance may also occur where the second winding core A2 has reached the position of Fig. 9 when the log L1 has already been released from the second winding cradle 10. [

The passage of the second winding core A2 in which the log is formed around the nip 5 defined by the first winding roller 1 and by the second winding roller 3 passes through the second winding roller 3, The shaft 1A of the first winding roller 1 remains stationary with respect to the structure of the power take-off. In this way, the actuation of the rewinding operation becomes more uniform, especially since the path of the winding material upstream of the nip 5 is not modified.

A further advantage of the embodiment of Fig. 9 lies in that the operation of the cutting member 23 of the web material N is simplified. In fact, this cooperates with the take-up roller 1, and its rotation axis does not move, thus simplifying the control of the cutting step of the web material N. [

The use of the first winding roller 1 of a larger diameter makes it possible to avoid the need for the intermediate support of the first winding roller 1, thereby simplifying the structure of the rewinding and improving the quality of the log have.

Claims (23)

An automatic continuous peripheral gripper for producing a log of a web material wound around a winding core,
A first winding cradle formed between the first winding roller, the second winding roller and the third winding roller; The first winding roller and the second winding roller defining the nip and passing the winding core through the nip to wind the web material around the winding core;
A second winding cradle formed between the first winding roller, the second winding roller and the fourth winding roller; With respect to the feeding direction of the winding core through the nip, the third winding roller is disposed upstream of the nip, and the fourth winding roller is disposed downstream of the nip; And
A rolling surface extending around the first winding roller, the rolling surface defining a winding core supply channel between the rolling surface and the first winding roller; Wherein the rolling surface is constructed and arranged with respect to the first take-up roller so that the take-up core is fed by rolling in contact with the rolling surface and with the web material carried around the first take-up roller, , Continuous surrounding power. The method according to claim 1,
And a cutting member of the web material configured and controlled to cut the web material at the end of the winding of the log within the second winding cradles. 3. The method of claim 2,
Wherein the cutting member is configured and controlled to cooperate with the first take-up roller. The method according to claim 2 or 3,
Wherein the cutting member is configured and controlled to cut the web material by pinning the web material against the first take-up roller and creating a tension on the web material that is greater than the breaking point of the web material. 5. The method of claim 4,
The cutting member is movable between a new core introduced into the winding core supply channel and a log forming in the second winding cradles, preferably between the cutting member and the log being formed in the second winding cradles, A continuous perimeter jig that is constructed and controlled to cut material. 6. The method according to any one of claims 2 to 5,
Wherein the cutting member is configured and controlled to cooperate with the first take-up roller at a point downstream of the take-up core entering the take-up core feed channel and inserted into the take-up core feed channel. 7. The method according to any one of claims 1 to 6,
Wherein the rolling surface extends from the feed channel inlet to the third take-up roller. 8. The method according to any one of claims 1 to 7,
Wherein the winding roller has a first portion of the winding of the log in the first winding coils between the first winding roller, the second winding roller and the third windingroller, and a second portion of the winding of the first winding- And is arranged and controlled to perform a final portion of the winding of the log within the second winding cradle between the roller and the fourth winding roller. 9. The method of claim 8,
Wherein the third winding roller and the fourth winding roller have a movable shaft and are provided with a plurality of winding rollers each having a movable shaft and which is accompanied by a movement of the log during the step of increasing the log diameter and transferring from the first winding cradle to the second winding cradle And is controlled to move orthogonally to the axis. 10. The method according to any one of claims 1 to 9,
Wherein at least one of the first winding roller and the second winding roller is operable to control a distance between the first winding roller and the second winding roller and a dimension of the nip between the first winding roller and the second winding roller With a shaft. 11. The method according to any one of claims 1 to 10,
Wherein the first winding roller has a fixed shaft and the second winding roller has a movable shaft, and preferably the first winding roller has a larger diameter than the second winding roller. 11. The method according to any one of claims 1 to 10,
Wherein both the first winding roller and the second winding roller have a movable axis to move away from each other and toward each other, preferably in a symmetrical manner. 13. The method according to any one of claims 1 to 12,
Wherein movement of the first take-up roller, of the second take-up roller, of the third take-up roller and of the fourth take-up roller during winding of the log is such that the first part of the take- Said second take-up roller and said third take-up roller to occur in said log; Wherein a second portion of the winding of the log is in contact with the first winding roller, the second winding roller, the third winding roller and the fourth winding roller to occur in the log; Wherein a third portion of the winding of the log is controlled to occur in the log in contact with the first winding roller, the second winding roller and the fourth winding roller. 14. The method according to any one of claims 1 to 13,
Wherein the rolling surface includes a first portion that is stationary relative to the support structure of the rewinder and a portion that moves with the axis of the third rewinding roller. 15. The method according to any one of claims 1 to 14,
Driven center having a pair of motor-driven centers configured and arranged to be connected to the winding core during at least a portion of a winding cycle, the motor- Continuous surrounding power. 16. The method according to any one of claims 1 to 15,
Wherein the first winding roller on which the web material is driven around has a diameter larger than the diameter of the second winding roller (3), preferably at least twice. 17. The method according to any one of claims 1 to 16,
Wherein the first winding roller has a shaft that is stationary with respect to the load-supporting structure of the power take-off, and the second winding roller has a shaft through which the nip defined between the first winding roller and the second winding roller And a shaft movable with respect to said saddle-shaped body of said occupant so as to allow or facilitate the passage of a forming log. CLAIMS What is claimed is: 1. A method of forming a log of web material, comprising the steps of winding web material and sequentially forming a log of said web material around a winding core:
Feeding the web material around the first winding roller of the first winding coils formed by the second winding roller and by the third winding roller by the first winding roller, 2: The winding roller comprises: feeding the web material defining a fourth winding roller and a second winding cray;
A first winding core is inserted into a supply channel formed between the first winding roller and a rolling surface extending around the first winding roller and is brought into contact with the rolling surface and with the web material carried around the first winding roller And supplying the first winding core along an insertion path between the first winding roller and the third winding roller, and supplying the first winding core into the first winding cradle Inserting;
Wherein the second winding rollers perform a first portion of a winding cycle of a first log around the first winding core in the first winding cradles and a second portion of the first winding core is wound around the second winding rollers through the nip defined between the first winding rollers and the second winding rollers, Conveying the first log forming from the first winding cradles into the winding cradles;
Performing a second portion of a winding cycle of the first log within the second winding cradle; And
Inserting a second winding core into the supply channel along the insertion path between the first winding roller and the third winding roller at the end of winding of the first log in the second winding cradle, Inserting a second winding core into the first winding cradle. 19. The method of claim 18,
Inserting the second winding core against the first winding roller that pinches the web material between the second winding core and the first winding roller, and inserting the second winding core in the second winding cray And cutting the web material between the second winding cores. 20. The method according to claim 18 or 19,
Applying a cutting member to the web material to cut the web material to produce a leading edge that begins winding the second log around the trailing edge of the first log and the second winding core. ≪ / RTI > 21. The method of claim 20,
And pinching the web material between the cutting member and the first roller. 22. The method according to claim 20 or 21,
Moving the third take-up roller toward the nip between the first take-up roller and the second take-up roller in the step of forming the log; Further comprising moving the third winding roller from the nip when the log contacts the fourth winding roller and arranging the third winding roller in a position cooperating with the cutting member. 23. The method according to any one of claims 18 to 22,
Wherein an intermediate portion of the winding cycle is performed between the first portion of the winding cycle and the second portion of the winding cycle, wherein the log being wound is the first winding roller, the second winding roller, Up roller and the fourth take-up roller to move across the nip between the first take-up roller and the second take-up roller.

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