JP2002205853A - Outer periphery rewinder and log manufacturing method for web material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rewinder and a rewinding method capable of cutting a web material accurately, reliably, and simply. SOLUTION: The rewinder manufacturing a log of the web material around a tubular core includes a first winding roller winding the web material, a second winding roller forming a gap to be inserted with the core between it and the first winding roller, and a third roller movably fitted to increase the diameter of the log and discharge the log when winding is finished. A blade is carried by a rotary member rotated around the axis of the first winding roller and is protruded from the contour of the roller. The blade is rotated at different speeds in the same direction as the first winding roller when it is kept in contact with the web material in the winding space determined by three rollers for deceleration or acceleration, thereby it can cut off the web material when winding is finished.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a perimeter rewinding apparatus and associated rewinding method for producing rolls or logs of web material such as paper on a tubular support or core.

[0002]

BACKGROUND OF THE INVENTION In a perimeter or surface rewinding apparatus of the type to which the present invention relates, a roll is wound around a tubular core which begins to rotate between a set of three rollers acting on the perimeter of the roll being formed. During the take cycle, its speed is kept constant and identical.

[0003] Powered triplets form a space of variable dimensions so that as the diameter of the rolls increases, the three rollers are in constant contact with the roll being formed. Two of the three rollers are positioned at a fixed distance to insert the core and form a gap through which the web material passes, while the third or pressure roller is movable and the diameter of the roll is reduced. In addition to being able to increase, the roll can be released at the end of winding.

[0004] In these rewinding devices, the so-called switching stage, which is sometimes called cut-off and transfer, is important. This step involves inserting a new core into the winding space with a special inserter, cutting the web material and then releasing the finished log. According to the prior art, this cutting is done in various ways, generally requiring a rapid change in the speed of two of the three winding rollers.

According to some well-known methods, of course, only significant speed changes of these rollers are caused by a new core inserted in the winding space between the rollers that advance the paper web. After the nip is formed, the paper web is pulled and torn. After cutting the paper web, the insertion of a new core into the winding space and the ejection of the forming log are effected by the speed difference between the two inlet rollers and between the two outlet rollers, respectively.

As mentioned above, this method of cutting paper requires large speed changes between the rollers and, in particular, a strong acceleration of the pressure rollers, which creates stresses on the construction of the device. Furthermore, it is difficult with such a method to cut the web material along a single predetermined perforation line to provide a complete log having the correct number.

Other systems use true cutting edges to cut the web at the end of winding and require complex actuation mechanisms. Furthermore, they are not very versatile, since they are designed to cut web materials of a given length.

[0008]

SUMMARY OF THE INVENTION It is an object of the present invention to overcome the disadvantages of the prior art methods and therefore to provide a reliable and simple rewinding device and a rewinding method for web materials. It is to provide.

[0009]

This object is achieved by a winding device and a method according to the attached independent claims. Preferred embodiments of the invention are evident from the dependent claims.

Therefore, according to the present invention, the blade is carried by the rotating member which rotates about the axis of the roller around which the web material is wound and rotates in the same direction as the roller. When the log is in the final stage, the rotating member is driven at the same or substantially the same speed as the web material and then pulls and cuts the web material by slowing or accelerating as it enters the winding space. Usually, the cutting of the material is performed along the cut line of the web.

[0011] Further features of the present invention will become more apparent from the following detailed description, which is purely illustrative and thus can be referred to as non-limiting embodiments.

The present invention will be described with reference to the drawings.

[0013]

BRIEF DESCRIPTION OF THE DRAWINGS These components will be briefly described with reference to the drawings, and in particular with reference to FIG. 1 which schematically shows some further components of the device. In the following description,
Although the members shown in the figures are described in singular form, it is clear that many of them, for example arms and levers, are arranged in pairs on both sides of the device.

In the accompanying drawings, W represents a web material, particularly paper, which is unreeled from a large roll (not shown) and is moving in the direction of arrow F, and is provided with an appropriate tension by rollers R1 and R2 to make a first winding. It is wrapped around the take-up roller A and rewound into a roll or log 1 of considerably smaller diameter around the tubular central core 2.

The first winding roller A is combined with the second winding roller B, and the core 2 is inserted into a gap 3 formed therebetween. During operation of the device, gap 3
Is constant and smaller than the diameter of the core, so that the core enters slightly into the gap. One of the two rollers A, B, in the example shown, a first take-up roller A is supported by a schematically illustrated movable arm 4 which pivots about 5 to form a gap 3 Can be adjusted to the diameter of the core 2 to be used.

The remainder of the triple winding roller is a third roller C, also called a pressure roller, which is supported by an arm 6 which is movable about a fulcrum 7 according to a predetermined law of motion, and While increasing the diameter of
It can be released at the end of the winding. Rollers A, B and C are rotatably mounted in a frame (not shown) and can be controlled by a conventional servomotor.

A supply slide 8 for the core 2 is provided upstream of the gap 3. A core insertion device having an idler roller 9 is carried on the end of an arm 10 that rotates about 11. The arm 10 is schematically shown by a dotted line in the accompanying drawings, but is actually in a beak shape and, as is well known, does not disturb the winding roller B, and the core 2 is inserted into the winding space. You can push it.

The blade 15 protruding from the contour of the roller A
The rotating member 14 carrying the first winding roller A
About the axis X. The member 15 is also referred to as a blade in the above and below for cutting the web material as described later, but does not necessarily have to have a knife-shaped cutting edge, and preferably does not have it.

The rotating member 14 is driven so as to rotate in the same direction as the roller A, which is a counterclockwise direction in the attached drawing, but is driven by a powered wheel 17 to pass around a tension roller 18. 16 are individually driven. Of course, other actuation means may be provided for the rotating member 14, such as chains, gears, and the like. The wheel 17 can be controlled by a servomotor.

The operation of the device according to the two embodiments shown respectively in FIGS. 2 to 7 and FIGS. 8 to 13 will be described, but in both embodiments the same reference numbers have been used to represent similar parts. Use

In the embodiment according to FIGS. 2 to 7, the blade 15 is concave outwardly and substantially V-shaped, with the first leg in the direction of rotation longer than the other, The inclination of the winding roller A with respect to the tangent line is small.

FIG. 2 shows the configuration of the apparatus while the roll 1 is being wound, in which the blade 15 is in the rest position and is stationary together with the rotating member 14. In this state, all three rollers A, B, and C rotate at a constant and substantially equal speed, which is a speed corresponding to the web material supply speed.

In FIG. 3, the device is in a phase near the switch, which is almost at the end of the winding of the roll 1 and the roll is to be discharged shortly and a new core 2 has to be inserted. At this stage, the blades 15 together with the rotating member 14 are powered by a wheel 17 and a belt drive 16.
As a result, the roller A starts to rotate in the same direction as the rotation direction of the roller A indicated by the arrow F1 in the accompanying drawings. After the initial acceleration phase, the blade 15 reaches the same speed as the web material W or very close to it.

In the stage shown in FIG.
5 moves at substantially the same speed as the web material W, and slightly lifts the web material W from the contour of the winding roller A, and enters the winding space with it. Also at this stage, the core insertion arm 10 starts to rise, moving the new core 2 into the gap between the two rollers A, B.

In FIG. 5, log 1 is actually completed,
Web material is being cut. At this stage, the pressure roller C has begun the acceleration phase, and the roll 1 moves from the winding space towards the outlet, possibly due to the lowering of the lower roller B. By decelerating the blade 15 at the same time as or slightly after the acceleration of the pressure roller C, the web material W has to slide on the contact edge 15 ′ of the blade 15. In this situation, the transverse cut line of the web material reaches a position passing through the point of contact 15 'with the blade 15,
Since the web material is pulled by the acceleration of the pressure roller C, the web material is stretched and, as shown in FIG.
Material separation occurs at the cut line.

In order to facilitate the cutting of the web material, the blade 15 has at least a contact point 15 ′ with the web material W.
It would be advantageous to have a high coefficient of friction. However, depending on the type of material to be wound, the various types of cut lines employed, and the absence of cut lines in the web material, the blade 15 can take on various shapes, such as continuous edges, saw teeth, and the like.

Returning to FIG. 6, the new core 2 to which the adhesive has been applied in advance moves to a position where it comes into contact with the separated web material W, starts to wind it, and starts forming a new roll 1. It will be seen that the possible speed difference between roller A and roller B, which has previously been decelerated, causes it to move into the winding space.

This situation is shown in FIG. 7, where the formed log has been released and the new log being formed is entering the winding space. The blade 15 is moving to the rest position, the core insertion arm 10 is returning to pick up a new core to start a new winding cycle, and the three rollers A, B, C are again at the same speed. Start spinning.

In the embodiment shown in FIGS. 8 to 13, the same continuous steps as in FIGS. 2 to 7 of the first embodiment are shown, and therefore they will not be described in detail.

A major difference between the second embodiment and the first embodiment is that the blade 15 is accelerated, not decelerated, for separating the web material W. For this reason, the blade 15 is formed of a material having a high coefficient of friction,
It is advantageous to have an outwardly convex profile.

In the situation shown in FIG. 11, the web material is further stretched by accelerating the blade 15 while strongly gripping the portion of the web material W pressed by the new core 2 against the upper take-up roller A. Cut along the cutting line between the inserted core and the blade.

Of course, the present invention is not limited to the specific embodiments described above and shown in the accompanying drawings, but, within the skill of the artisan, to the appended claims. Various changes can be made in detail without departing from the scope of the invention as defined by

[Brief description of the drawings]

FIG. 1 is a schematic side view of the basic members of a rewinding device according to the present invention.

FIG. 2 is a view similar to FIG. 1, but showing successive stages of a winding cycle according to a first embodiment of the present invention.

FIG. 3 is a view similar to FIG. 1, but showing successive stages of a winding cycle according to a first embodiment of the present invention;

FIG. 4 is a view similar to FIG. 1, but showing successive stages of a winding cycle according to a first embodiment of the present invention;

FIG. 5 is a view similar to FIG. 1, but showing successive stages of a winding cycle according to a first embodiment of the present invention;

FIG. 6 is a view similar to FIG. 1, but showing successive stages of a winding cycle according to a first embodiment of the present invention;

FIG. 7 is a view similar to FIG. 1, but showing successive stages of a winding cycle according to a first embodiment of the present invention;

FIG. 8 is a view similar to FIG. 1, but showing successive stages of a winding cycle according to a second embodiment of the present invention;

FIG. 9 is a view similar to FIG. 1, but showing successive stages of a winding cycle according to a second embodiment of the invention;

FIG. 10 is a view similar to FIG. 1, but showing successive stages of a winding cycle according to a second embodiment of the present invention;

FIG. 11 is a view similar to FIG. 1, but showing successive stages of a winding cycle according to a second embodiment of the present invention;

FIG. 12 is a view similar to FIG. 1, but showing successive stages of a winding cycle according to a second embodiment of the present invention;

FIG. 13 is a view similar to FIG. 1, but showing successive stages of a winding cycle according to a second embodiment of the present invention;

[Explanation of symbols]

 A first take-up roller B second take-up roller C pressure roller 2 core 3 gap 14 rotating member 15 blade

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B65H 19/26 B65H 19/26 (72) Inventor Mauro Biagioni 55017 San Pietro a Vico, Italy Lucca, Via Per Corte Cucchi 224 (72) Inventor Sergio Casella, Italy 55026 Bagni di Lucche, Fornoli Lucca, Via della Chiusa 305 F-term (reference) 3F055 AA01 CA09 DA10 EA01 3F064 AA01 CA10 DA01

Claims (16)

[Claims] 1. An outer peripheral rewinding device for manufacturing a log of a web material on a core, comprising: a first winding roller having a central axis of rotation and capable of winding the web material;
A second take-up roller that forms a gap between the first take-up roller and a gap into which a core can be inserted, and a log that increases the diameter of the log and is movable to discharge the log at the end of winding. A third roller mounted thereon, wherein the winding space is defined by the first, second and third rollers, and means for cutting the web material at the end of winding, and inserting a new core. Means for cutting the web material, wherein the means for cutting the web material is carried by a rotating member that rotates about the axis of the first take-up roller and protrudes from the first take-up roller. The first take-up row when the blade is in contact with the web material in the take-up space defined by the three rollers. The outer peripheral winding fix machine, characterized in that is provided with a driving means for providing a speed change to said blade by rotating at different speeds in the same direction as the. 2. The rewinding device according to claim 1, wherein the blade has at least one coating made of a material having a high coefficient of friction so as to strongly grip the web material. 3. The operating means for the blade, wherein the blade is decelerated when the blade is in contact with the web material in the take-up space, so that a point of contact between the web material and the blade and the log. 2. The rewinding device according to claim 1, wherein the web material can be cut between the web members. 4. The operating means for the blade accelerates the blade when the blade is in contact with the web material in the take-up space such that a new core contacts the first take-up roller. 2. The rewinding device according to claim 1, wherein the web material can be cut between a nip point of the web material generated thereby and a contact point between the blade and the web material. 5. The web material according to claim 1, wherein the web material has a predetermined transverse cut line for cutting the web material.
A rewinding device as described. 6. The rewinding device according to claim 1, further comprising means for accelerating the rotation of the third roller during cutting of the web material. 7. The rewinding device according to claim 1, further comprising means for reducing the rotation of the second winding roller during cutting of the web material. 8. The rewinding apparatus according to claim 1, further comprising means for rotating the rotating member and the blade, and independent means for rotating the first winding roller. 9. A method of manufacturing a log of a web material such as paper, comprising feeding a web material along a first take-up roller having a rotation axis, the first take-up roller, the second take-up roller, and the second take-up roller. A method of winding a web material around a core rotating in a winding space defined by three rollers, and cutting the web material at the end of winding of the log, wherein the cutting is rotated about an axis of the first winding roller. Is carried out by a blade carried by a rotating member rotatable at different speeds, the blade protruding from the first winding roller and changing the speed when in contact with the web material in the winding space. A method characterized in that: 10. The blade according to claim 9, wherein the blade has a high coefficient of friction and strongly grips the web material.
The described method. 11. The blade is capable of decelerating when in contact with web material in the take-up space to cut web material between a point of contact of the blade and web material and a log. 10. The method according to claim 9, wherein
The described method. 12. The blade accelerates when in contact with the web material within the take-up space, the nip point of the web material being determined by the contact of a new core and the first take-up roller and the blade. 10. The method of claim 9, wherein the web material can be cut between and a contact point of the web material. 13. The web material has a predetermined transverse cut line, and the cutting of the web material is one of the cut lines of the web material.
10. The method of claim 9, wherein the steps are performed along 14. The method of claim 9, wherein the rotation of the third roller is accelerated during cutting of the web material. 15. The method of claim 9, wherein the rotation of the second take-up roller is reduced during cutting of the web material. 16. The method of claim 9, wherein the blade rotates independently of the first take-up roller.