Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H19/00—Changing the web roll
  • B65H19/22—Changing the web roll in winding mechanisms or in connection with winding operations
  • B65H19/2238—The web roll being driven by a winding mechanism of the nip or tangential drive type
  • B65H19/2269—Cradle
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H19/00—Changing the web roll
  • B65H19/22—Changing the web roll in winding mechanisms or in connection with winding operations
  • B65H19/26—Cutting-off the web running to the wound web roll
  • B65H19/267—Cutting-off the web running to the wound web roll by tearing or bursting

Definitions

• the present invention concerns an apparatus for rewinding logs, around a tubular core, of a web material.
• the present invention concerns an apparatus for creating logs of toilet paper, kitchen rolls, industrial paper or other kinds of rolls of any size, comprising means for feeding the web material to a first winder roller which together with a second winder roller defines a runner through which the web material and the tubular core thereof pass to get to a winding cradle formed by said two winder rollers where the log grows, means for introducing the tubular core that are placed upstream the runner and means for interrupting the web material when a log is completed that are placed between the core introducing means and the runner.
• a rewinding machine for making toilet paper rolls in which a paper punching assembly is mounted upstream the log change assembly providing a first steady axis winder roller about which the paper is fed and a second steady axis winder roller that makes together with the first roller a runner for the passage of the paper and core thereof about which the paper rolls up, while a third movable axis winder roller keeps the log in a winding cradle between said first and said second roller guiding the log formation.
• a conduit is obtained, between the first winder roller and a curved member, said conduit being as high as the diameter of the tubular core and shaped like a circular sector where the core rolls towards the runner.
• the paper is cut by paper interrupting means made of a pad that, mounted on 360° rotating support, periodically cooperates with the surface of the first winder roller in order to create on the paper surface friction forces in opposite directions that cause the web to break apart along a perforated line.
• the machine described in the international application WO9534498 aims to overcome, at least partially, the above problems by providing a similar machine in which said curved member is elastically mounted and it is therefore able to change its configuration when cores of different sizes pass through it. Furthermore, in order to allow the use of cores of different sizes in a same machine it is possible to adjust the position of other elements such us the web feeding and introducing means and the position of the second winder roller.
• Logs of bigger size mainly big logs for industrial use, are in fact usually formed by using machines that are structurally very different from the above described ones.
• logs are formed in machines generally called slitter-re winders in which, upstream the log change assembly is installed an assembly for longitudinally cutting the web material to obtain partial webs that are wound around series of aligned tubular cores contemporaneously introduced in the log change assembly by specific loading means.
• Object of the present invention is to provide an apparatus, and method thereof, for winding logs, around a tubular core, of web material, comprising means for feeding the web material to a first winder roller which together with a second winder roller defines a runner through which the web material and the tubular core thereof pass to get to a winding cradle formed by said two winder rollers where the log grows, means for introducing the tubular core that are placed upstream the runner and means for interrupting the web material when a log is completed that are placed between the core insertion means and the runner, said apparatus having a very simple and optimized structure apt to increase reliability of the machine.
• Further object of the present invention is to propose an apparatus for creating logs of web material apt to realize logs of a wide range of sizes and weights with a wide range of tubular cores, by simply adjusting the position of few elements.
• Another object of the present invention is to propose a method for creating logs of web material around a tubular core suitable and effective both for the series production of logs of small diameter such as toilet paper logs and for the formation of big industrial rolls.
• a rewinding machine for the formation of logs of web material wound around a tubular core
• said rewinding machine comprising web feeding means, a first winder roller, a second winder roller which defines together with the first winder roller a runner where said tubular core and said web material pass through, core insertion means for introducing said tubular core placed upstream said runner referred to the web material advance direction, web interrupting means for interrupting said web material between a wound log and a newly introduced tubular core by periodically cooperating with said web feeding means in a region comprised between said core insertion means and said runner, and wherein said first and said second winder roller define a log winding cradle during the log formation phase, characterized in that said web interrupting means keep said tubular core in contact with said web feeding means along at least a portion of said region, said web material laying between said web feeding means and said tubular core.
• said web feeding the web interrupting means swing around a hinge member and they are provided with elastic means apt to minimize the gap between the web interrupting means themselves and the first winder roller.
• the web interrupting means are provided with actuator means apt to bring them in contact with said first winder roller in order to interrupt the web material when a log has been wound, the pressure of said web interrupting means against said first winder roller being limited by said elastic means.
• the web interrupting means are provided with web interrupting members comprising at least one blade cooperating with at least one counter-blade integral to the surface of the first winder roller.
• the core processing means comprise a roller for applying glue on the core surface and all the components of the machine apt to enter in contact with said tubular core, within a region comprised between an adhesive application station for applying glue on the surface of the tubular core and a zone where the web material starts covering the glue, provide among their core contact members transversal gaps preventing the glue from coming in contact with said core contact members.
• the rewinding machine comprises core cut means placed upstream said core insertion means and apt to split each tubular core in a plurality of tubular cores whose axis are on a same straight line.
• the core insertion means introduce in said region a plurality of tubular cores at the same time, as well as said core insertion means and said web interrupting means have a rack- like structure consisting of a plurality of core contact members spaced so that each tubular core is contemporaneously supported by at least two core contact members.
• a rewinding machine according to the invention has the high productivity typical of the rewinding machines of the type disclosed in US5979818 and it also allows processing tubular cores of a wide range of diameters with the great advantage of very simple and reliable structure.
• Further advantage of a rewinding machine according to the invention is the capability of forming big sized rolls just upon replacing or adjusting the position of few elements.
• figure 1 shows a schematic front view of an automatic rewinding machine with continuous web feeding according to the invention
• figure 3 shows a top view of some components of the log change assembly
• figure 4 shows a detailed view of fig.1 pointing out the region where the web interrupting means cooperate with the first winder roller and, in a turned view is shown the shape of the interrupting members;
• figure 5 shows a schematic front view of a different embodiment of a rewinding machine according to the invention, specifically a slitter-rewinder for creating big sized rolls;
• figure 6 shows a detail of fig.5 in which are represented the components of a log change assembly
• figure 7 shows a view similar to the view of fig.3, in which is represented a different embodiment of the components shown in fig.3, the embodiment being particularly suitable for processing series of aligned tubular cores;
• figure 8 shows a view similar to the view of fig.4 representing a different embodiment of the interrupting means.
• FIG.1 In fig.1 are shown the main components of an automatic rewinding machine for winding around a tubular core a web of tissue paper to form toilet paper logs, kitchen paper logs or the like.
• the web, N is dragged through a series of traction rollers, 11, until it reaches a first winder roller, 12, where it partially turn around.
• the web passes through a widener roller, 13, which is a tensor roller having curved axis and when the web passes over it is transversally stretched to its maximum width, then it passes through a punching assembly, 14, composed of a first roller, 15, which has helicoid disposed blades, 16, and of a second roller, 18, mounting a matching surface, 19, and the punching assembly makes in the web transversal perforated lines at the same longitudinal distance and perpendicular to the feeding direction.
• a widener roller, 13 is a tensor roller having curved axis and when the web passes over it is transversally stretched to its maximum width
• a punching assembly composed of a first roller, 15, which has helicoid disposed blades, 16, and of a second roller, 18, mounting a matching surface, 19, and the punching assembly makes in the web transversal perforated lines at the same longitudinal distance and perpendicular to the feeding direction.
• a second winder roller, 20, defines together with the first winder roller 12 a winding cradle, 21, where the log grows.
• the first winder roller 12 feeding the web N, the second winder roller 20 and a third roller, 22, rotate at a same peripheral speed so the log R is put into rotation around its axis.
• the roller 22 has a mobile axis and it moves away from the first and second winder roller as much as the log grows in diameter.
• tubular cores, A housed in the saddles 25 thereof descend along the upper branch of the chain conveyor 26 passing through glue applying means, 30, comprising a glue applying cylinder, 31, a tank, 32, containing the gluing fluid, and a counter cylinder, 33, mounted on pivotable supporting arms, 34, in order to fit various core diameters.
• tubular cores A reach the core insertion means, 40, apt to let the core A enter a region, 50, comprised between the core insertion means 40 themselves and a runner, 60, defined by the gap between the two winder rollers 12 and 20 and designed to allow the passage of the core that so reaches the winding cradle.
• the tubular core A gets in contact with the web N dragged by the first winder roller 12 and, thanks to the web interrupting means, 70, the web is severed so that the downstream end of the web finishes winding around the log R and the upstream end of the web starts winding around the tubular core that has just entered the region 50.
• a tubular core A is placed, ready to be inserted, at the core insertion means 40 comprising a support member, 41, an introducer, 42, pivoting around the support member 41, and a slide, 43, guiding the tubular core A in the first portion of the region 50 and maintaining it in contact with the first winder roller.
• the web interrupting means 70 that comprise a shaped supporting arm, 71, pivoting around a hinge, 72, and comprising at its end interrupting members, 73, cooperating with the roller 12 to severe the web.
• the web interrupting means 70 further comprise elastic means, 74, that keep the interrupting members 73 close to the surface of the roller 12, said elastic means being, in the present embodiment, an air spring comprising an upper shell, 75, rigidly connected to the arm 71 and a lower shell, 76, pivoting around the hinge 72, the two shells defining a chamber,
• the lower shell 76 is connected to actuator means,
• the tubular core going on in the region 50 finds the shaped arm 71 that, being elastically adaptable thanks to the elastic means 74, rotates around the hinge 72 pushed by the core A and at the same time supports the core itself keeping it in contact with the first winder roller 12.
• N wrapped around passes through the runner 60 keeping rolling between the winder rollers thanks to the fact that the second winder roller 20 rotates with a peripheral speed lower than the first winder roller 12, or, even, in a specific embodiment, it stops.
• the elastic means 74 have taken the interrupting members 73 back in a position close to the roller 12 just after the passage of the core.
• FIG.3 In fig.3 is shown a top view of some components pointing out that when very long cores A are used, as usually occurs for producing toilet paper logs where the logs are transversally cut downstream the rewinding machine, it could be used a glue applying cylinder shaped so that it applies strips of glue C having a certain length.
• glue applying cylinder shaped so that it applies strips of glue C having a certain length.
• such components are shaped to touch the core A in the portions of it where there are not glue stripes C.
• the core keeping saddles 25, the introducer, 42, the slide 43 and the shaped supporting arm 71 comprise portions apt to get in contact with the core having a vary small transversal size and placed in the transversal gaps between two subsequent glue stripes.
• the interrupting members 73 can be indifferently placed also in the transversal portion where there are the glue stripes since when the tubular core A reaches the interrupting members the web has started winding around the core so covering the glue that this way cannot stain the components coming in contact with the core.
• FIG.4 In fig.4 is shown a detail of fig.l in which there are the interrupting members 73 comprising a series of pads, 79, with a rough surface apt to cerate friction with the surface of the web N.
• the interrupting members 73 comprising a series of pads, 79, with a rough surface apt to cerate friction with the surface of the web N.
• pads 79 are replaced by blades 79' acting together with corresponding counter-blades, 80, bound to the surface of the roller 12 by specific fastening means, 81. Also in this embodiment the web is severed by synchronizing the actuator means 78 with the rotation of the winder roller 12 to let the blades 79' and the counter-blades 80 work together.
• the interrupting means could move, instead of around the hinge 72, on a straight line, for instance in a direction perpendicular to the web feeding means.
• the web interrupting means may move in a winder roller radial direction.
• they could be provided with the elastic means and the actuator means.
• a slitter-rewinder comprising traction rollers, 11", for feeding the web N, a widener roller, 13", and a longitudinal cutting assembly, 85, apt to longitudinally cut the web N slitting it in a series of adjacent tapes that then reach the first winder roller, 12".
• the second winder roller, 20 has its axis at the same height of the axis of the first winder roller 12", so that the log R grows with its axis vertically over the center of the winding cradle 21" and avoiding unbalancing that may be dangerous in view of the relevant weight of the formed logs. Still due to the weight of the logs the movable axis third roller 22" is mounted in a frame that also supports a centering assembly, 87, that keeps the axis of the tubular cores in the correct position.
• the tubular cores feeding assembly may comprise, along the feeder 23" a core cutting assembly, 88, that splits the core A in a series of adjacent tubular cores Al, A2, ..., AN around which the corresponding tapes of web slit by the longitudinal cutting assembly 85 wind.
• the glue applying member 31" is provided with protruding branches apt to apply glue in specific angular positions of the cores and dimensioned in function of the size of the core and of the other components of the log change assembly.

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• Replacement Of Web Rolls (AREA)
• Diaphragms For Electromechanical Transducers (AREA)
• Stringed Musical Instruments (AREA)
• Superconductors And Manufacturing Methods Therefor (AREA)

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Cited By (6)

Citations (5)

• 2008
  • 2008-07-10 IT ITPI2008A000057A patent/IT1390602B1/it active
• 2009
  • 2009-07-09 WO PCT/IB2009/052993 patent/WO2010004521A1/en not_active Ceased

Patent Citations (5)

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