US20230416042A1 - Folding, or interfolding, unit of a web, or sheet, of paper in a paper converting machine - Google Patents

Folding, or interfolding, unit of a web, or sheet, of paper in a paper converting machine Download PDF

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Publication number
US20230416042A1
US20230416042A1 US18/037,984 US202118037984A US2023416042A1 US 20230416042 A1 US20230416042 A1 US 20230416042A1 US 202118037984 A US202118037984 A US 202118037984A US 2023416042 A1 US2023416042 A1 US 2023416042A1
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United States
Prior art keywords
folding
interfolding
paper
sheet
web
Prior art date
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Pending
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US18/037,984
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English (en)
Inventor
Daniele Damiani
Sergio Lombardi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Korber Tissue Fold SRL
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Korber Tissue Fold SRL
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Publication date
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Assigned to KÖRBER TISSUE FOLD S.R.L. reassignment KÖRBER TISSUE FOLD S.R.L. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: DAMIANI, DANIELE, LOMBARDI, Sergio
Publication of US20230416042A1 publication Critical patent/US20230416042A1/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H45/00—Folding thin material
    • B65H45/12—Folding articles or webs with application of pressure to define or form crease lines
    • B65H45/24—Interfolding sheets, e.g. cigarette or toilet papers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H29/00—Delivering or advancing articles from machines; Advancing articles to or into piles
    • B65H29/54—Article strippers, e.g. for stripping from advancing elements
    • B65H29/56—Article strippers, e.g. for stripping from advancing elements for stripping from elements or machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2406/00—Means using fluid
    • B65H2406/30—Suction means
    • B65H2406/33—Rotary suction means, e.g. roller, cylinder or drum
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2406/00—Means using fluid
    • B65H2406/30—Suction means
    • B65H2406/33—Rotary suction means, e.g. roller, cylinder or drum
    • B65H2406/334—Rotary suction means, e.g. roller, cylinder or drum arranged on movable frame
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2406/00—Means using fluid
    • B65H2406/30—Suction means
    • B65H2406/36—Means for producing, distributing or controlling suction
    • B65H2406/363—Means for producing, distributing or controlling suction adjusting or controlling distribution of vacuum for a plurality of suction means
    • B65H2406/3632—Means for producing, distributing or controlling suction adjusting or controlling distribution of vacuum for a plurality of suction means means for auto adjustment of vacuum distribution according to the size of handled material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
    • B65H2511/10—Size; Dimensions
    • B65H2511/11—Length
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2513/00—Dynamic entities; Timing aspects
    • B65H2513/50—Timing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/10—Handled articles or webs
    • B65H2701/19—Specific article or web
    • B65H2701/1924—Napkins or tissues, e.g. dressings, toweling, serviettes, kitchen paper and compresses

Definitions

  • the present invention relates to the technical field of paper converting, and similar products, and, in particular, relates to a machine for interfolding a web, or sheet, of paper.
  • the invention furthermore, relates to a method for folding or interfolding a web or sheet of paper according to a determined interfolding configuration.
  • the interfolding machines of known type work one, or more, webs of paper coming from one, or more reels that are cut at a cutting unit, in sheets of predetermined length and staggered fed to a folding unit at which 2 counter-rotating folding rolls work. More precisely, the cut in sheets of the webs is carried out on cutting rolls which alternately cooperate with related counter-blades.
  • the folding rolls have a circumference whose length is a multiple of the panel length.
  • the folding rolls are provided with retaining devices, such as suction holes, or mechanical pliers, which are synchronously activated for alternately starting and finishing each fold between two following panels.
  • a folding or interfolding unit comprises, normally, a first folding or interfolding roll, which keeps the web or sheet of paper for a determined angular distance by a determined suction system comprising a determined number of longitudinal rows of suction holes, and then “passes” the sheet to a second folding or interfolding roll, also this provided with a vacuum distribution device symmetric to that of the first suction roll, and which works for another predetermined angular distance.
  • This controlled “passage” of the sheet of web of paper from a folding roll to another one allows to obtain the desired folding or interfolding configuration of a stack of interfolded or folded sheets.
  • the folding or interfolding unit provides, normally, also a first and a second plurality of “detaching” fingers moved in phase with respect to the respective folding rolls to cause the detachment of the sheets from the respective external surface.
  • Separation members are, furthermore, provided to separate a finished stack of interfolded sheets from the following stack to be formed. Both the detaching fingers and the separator members are, normally, moved within respective grooves peripherally made in the folding rolls.
  • the advancement of the processed web or sheet of paper along the machine on which the suction roll described in EP1457444 is mounted, as well as analogous suction rolls, cannot exceed a predetermined threshold value of the advancement speed, normally about 150 ⁇ 200 m/min, value that is imposed by constructional and functional limits of determined components of the machine.
  • the aforementioned values of the advancement speed of the paper along the machine are also used, together with the path to be followed, to design the detaching fingers, in particular the oscillatory motion of these, and the suction roll, in particular positioning the sealing members at predetermined angular positions.
  • the aforementioned values of the speed used for designing the suction roll are not respected, during the functioning of the machine, drawbacks of different kind can occur.
  • the processed web or sheet remains adhered to the surface of the suction roll also after the second angular position, i.e. to a portion of the surface positioned downstream of the second sealing member.
  • This causes an advancement of the web or sheet of paper that is not accurate through the different sections of the machine and further to unavoidably compromise the quality of the final product, in particular forming unwanted folds, can cause also jamming of the paper which make it necessary to stop the machine in order to remove the jammed paper with consequent loss of time and productivity.
  • Analogous drawbacks also occur in the prior art machines in the case that the web or sheet of paper to be processed has a paper weight different from a predefined paper weight on the basis of which the folding or interfolding rolls are designed.
  • the web or sheet of paper remains adhered to the folding or interfolding roll, beyond the predetermined releasing point, with the aforementioned drawbacks.
  • the webs or sheets of paper with a higher paper weight cover a longer path also after the end of the suction by the roll due to the higher inertia thus causing the aforementioned functional problems and of loss of quality of the final product. Therefore, the prior art machines equipped with folding or interfolding rolls, in addition to have a low productivity, are rigid because are not able to work webs, or sheets of paper with different paper weights.
  • an object of the present invention to provide a folding or interfolding unit that is able to overcome the aforementioned drawbacks of the prior art folding or interfolding rolls, in particular of the type provided with suction holes.
  • a folding or interfolding unit of a web, or sheet, of paper comprising:
  • a method for folding or interfolding, a web or sheet of paper in a paper converting machine comprising the steps of:
  • the adjustment step is atta a delay or anticipate, the oscillatory motion of the first and of the second plurality of detaching fingers with respect to a predetermined reference oscillatory motion. More in particular, the aforementioned reference oscillatory motion is arranged to cause the detachment of the web or sheet of paper from the respective folding roll at a predetermined realising reference instant tr*.
  • FIG. 1 diagrammatically shows a side elevation view of a first embodiment of a folding or interfolding unit according to the invention
  • FIGS. 2 and 3 diagrammatically show side elevation views of possible alternative embodiments of the folding or interfolding unit of FIG. 1 ;
  • FIG. 4 diagrammatically shows a side elevation view of a first embodiment of a folding or interfolding roll, according to the invention
  • FIGS. 5 and 6 diagrammatically show transversal cross section views of a first embodiment of a folding or interfolding roll, according to the invention, respectively in the catching instant, and in the releasing instant of a web or sheet of paper;
  • FIGS. 7 and 8 diagrammatically show, respectively, a side elevation view and a transversal cross section of a first functioning mode of the folding or interfolding roll, according to the invention
  • FIG. 9 shows an enlargement of a portion of FIG. 8 to diagrammatically show some aspects of the first functioning mode of the folding or interfolding roll according to the invention.
  • FIGS. 10 and 11 diagrammatically show, respectively, a side elevation view and a transversal cross section of a second functioning mode of the folding or interfolding roll, according to the invention
  • FIG. 12 shows an enlargement of a portion of FIG. 11 to diagrammatically show some aspects of the second functioning mode of the folding or interfolding roll according to the invention
  • FIG. 13 diagrammatically shows a longitudinal cross section view of an alternative embodiment according to the invention for the folding or interfolding roll of FIG. 4 ;
  • FIG. 14 diagrammatically shows the alternative embodiment of FIG. 13 of the folding or interfolding roll a side elevation view
  • FIGS. 15 and 16 show, respectively in a side view and in a transversal cross section, of a first functioning mode of the folding or interfolding roll of FIGS. 13 and 14 ;
  • FIGS. 17 and 18 show, respectively in a side view and in a transversal cross section, a second functioning mode of the folding or interfolding roll of FIGS. 13 and 14 ;
  • FIGS. 19 and 21 show transverse cross section views of other possible alternative embodiments of the roll of FIGS. 13 and 14 according to the invention.
  • FIG. 20 shows an enlargement of a portion of FIG. 19 to highlight some technical characteristics
  • FIG. 22 shows a side elevation view of another alternative embodiment according to the invention for the folding or interfolding roll of FIG. 4 ;
  • FIG. 23 diagrammatically shows a side elevation view of a possible embodiment of a paper converting machine which uses the folding or interfolding unit according to the invention.
  • a folding or interfolding unit 150 comprises a first and a second folding or interfolding roll 1 a and 1 b .
  • the first and second folding or interfolding rolls 1 a and 1 b are configured to fold or interfold the web or sheet of paper according to a predetermined folding or interfolding configuration, at a folding or interfolding zone 35 defined between them.
  • the folding or interfolding unit 150 comprises a first and a second plurality of detaching fingers 40 a and 40 b arranged to operate in phase, respectively, with the first and the second folding or interfolding roll 1 a and 1 b to detach a respective web or sheet of paper 5 from surface 11 of a respective tubular body 10 a and 10 b of the first and of the second folding or interfolding roll 1 a and 1 b , in such a way to form a stack 250 of folded or interfolded sheets.
  • a first and a second actuation group 80 a and 80 b can be provided configured, respectively, to cause a back-and-forth oscillatory motion of the first and of the second plurality of detaching fingers 40 a , and 40 b towards/from the aforementioned folding or interfolding zone 35 .
  • the first and the second actuation group 80 a and 80 b are, furthermore, configured to postpone or anticipate the oscillatory motion of the first and of the second plurality of detaching fingers 40 a , and 40 b with respect to a predetermined reference oscillatory motion, in such a way to postpone or anticipate, the instant tr in which the first and the second plurality of detaching fingers 40 a and 40 b are arranged to cause the web or sheet of paper 5 to be detached from the respective folding or interfolding roll 1 a and 1 b , in particular with respect to a predetermined reference realising instant tr*.
  • the first and the second actuation group 80 a and 80 b can comprise, respectively, a first and a second actuation device 91 a and 91 b .
  • the first and the second actuation device 91 a and 91 b are provided, respectively, with a first and with a second motor group 85 a , 85 b .
  • These are, respectively, operatively connected to a first and to a second motor shaft 86 a , and 86 b .
  • the first and second motor groups 85 a and 85 b are arranged to cause a rotation of the first and of the second motor shaft 86 a and 86 b about respective axes of rotation 185 a and 185 b.
  • first and the second actuation group 80 a and 80 b can comprise, respectively, a first and a second oscillator device 90 a , 90 b configured to convert the rotational motion on an inlet axis, or power take-off, to an oscillatory motion on an outlet axis, or power take-off.
  • the oscillator device of mechanical type can be a device of known type to the skilled person in the art and will not be described in detail here.
  • the first oscillator device 90 a and the second oscillator device 90 b can comprise respectively a first and a second mechanical cam, preferably a first and a second desmodromic cam, not shown in the figure for simplicity reasons.
  • first and the second motor shaft 86 a and 86 b can be connected at the inlet to the first and to the second oscillator device 90 a and 90 b .
  • These advantageously, comprise outlet shafts 83 a and 83 b , respectively, connected to a first and a second transmission group 81 a and 81 b arranged to transmit the oscillatory motion to the first and to the second plurality of detaching fingers 40 a and 40 b .
  • the aforementioned outlet shafts 83 a and 83 b are connected to the first and to the second transmission group 81 a and 81 b by a respective mechanical cam 84 a , and 84 b , advantageously a desmodromic cam, case that is not shown in the figures for clarity reasons.
  • the solution provided by the present invention is able to guarantee a greater accuracy.
  • the solution provided by the present invention allows to very accurately adjust the phase between the detaching fingers 40 a and 40 b and the respective rolls 1 a and 1 b , in particular to anticipate, or postpone, the oscillatory motion, respectively, of the first and of the second plurality of detaching fingers 40 a and 40 b with respect to a predetermined reference oscillatory motion.
  • the phase of the detaching fingers 40 a and 40 b i.e. postpone or anticipate the oscillatory motion with respect to the other mechanical organs of the machine 100 , slackening, or accelerating, for the necessary period of time, the first and the second motor group 85 a and 85 b .
  • the first and the second motor group 80 a and 85 b are slacken, or accelerated for an interval of time ⁇ t*, and then their speeds are brought back to the reference speed vm*.
  • the first and second actuation groups 80 a and 80 b comprise, respectively, a first and a second motor group 85 a and 85 b arranged to cause the rotation of a first and of a second motor shaft 86 a , and 86 b about respective axes of rotation 185 a and 185 b .
  • a first and a second oscillator device 90 a and 90 b are provided, arranged to convert the rotational motion of the motor shaft 86 a and 86 b to an oscillatory motion, and a first and a second transmission group 81 a and 81 b arranged to transmit the oscillatory motion at the outlet of the first and of the second oscillator device 90 a and 90 b , respectively, to the first and to the second plurality of detaching fingers 40 a , and 40 b.
  • the first and second oscillator devices 90 a and 90 b are, advantageously, associated, respectively, to a first and to a second adjustment device 94 a and 94 b configured to adjust the phase of the first and second pluralities of detaching fingers 40 a and 40 b with the respective folding or interfolding rolls 1 a and 1 b .
  • first and the second adjustment device 94 a and 94 b are arranged to anticipate, or postpone, the instant tr in which the first and the second plurality of detaching fingers 40 a , 40 b are arranged to hit the web or sheet of paper 5 to cause the same to be detached from the respective folding or interfolding roll 1 a and 1 b.
  • the first and the second adjustment device 94 a and 94 b can comprise, respectively, a first and a second phase-shifter gearbox 95 a , and 95 b of type known to the skilled person in the art. More precisely, in this case, the first and the second phase-shifter gearbox 95 a and 95 b can be operatively connected respectively to the first and to the second motor group 85 a and 85 b , for example, by a first transmission belt 87 a and 87 b , and to a first and to a second actuation device 91 a and 91 b by a second transmission belt 88 a and 88 b .
  • the first and the second actuation device 91 a and 91 b are arranged to transmit the rotational motion generated dal first and dal second motor group 85 a and 85 b , respectively to the aforementioned first and second oscillator device 90 a and 90 b which convert the rotational motion to the aforementioned oscillatory motion which is transmitted to the first and the second plurality of detaching fingers 40 a and 40 b .
  • the first and the second phase-shifter gearbox 95 a and 95 b are, respectively, provided with a first and a second electric motor 96 a and 96 b .
  • the first and the second oscillator device 90 a and 90 b in any of the embodiments described above, can be connected to a respective first end 81 ′ a and 81 ′ b of the aforementioned first and second transmission group 81 a and 81 b operatively connected at a second end 81 ′′ a and 81 ′′ b opposite to the first end, respectively, to the first and to the second plurality of detaching fingers 40 a and 40 b . Therefore, the first and the second oscillator device 90 a and 90 b are positioned laterally, respectively, to the first and to the second plurality of detaching fingers 40 a and 40 b.
  • the first and the second electric motor 96 a and 96 b can be normally still in such a way not to change the phase of the detaching fingers 40 a and 40 b with respect to the rest of the machine 100 , in particular to the folding rolls 1 a , 1 b .
  • the first and second electric motors 96 a and 96 b are operated to actuate respectively the first and the second epicycloid gear in such a way to temporarily accelerate, or decelerate the second transmission belt 88 a and 88 b .
  • first and the second folding or interfolding roll, 1 a and 1 b of the folding or interfolding unit 150 described above with reference to the FIGS. 1 and 2 can be provided with members for retaining the processed web or sheet, of paper 5 of mechanical type (for example provided with mechanical pliers of known type), or of pneumatic type.
  • the retaining members can provide bell-shaped vacuum distribution devices, of known type, or comprising sealing sectors of the type that is, for example, described in EP1457444B1.
  • the folding or interfolding unit 150 in addition to the aforementioned first and second actuation groups 80 a and 80 b of the detaching fingers 40 a and 40 b can provide a first and a second folding or interfolding roll 1 a and 1 b as described below.
  • each folding or interfolding roll 1 a , or 1 b of a web or sheet of paper, 5 fed along an advancing direction 15 in a paper converting machine, or similar products comprises a tubular body 10 configured to rotate in a predetermined sense of rotation 110 , for example clockwise, about a longitudinal rotation axis 101 .
  • the tubular body 10 of the roll 1 a , or 1 b is provided with an external surface 11 and with an internal lateral surface 12 put in communication with each other through a plurality of suction holes 3 .
  • the suction holes 3 of the folding or interfolding roll 1 a , or 1 b can be organized according to a predetermined number of suction groups, for example 2, or 3, or 4, suction groups 30 , positioned in predetermined angular positions of the folding or interfolding roll 1 a , or 1 b , for example each 180°, 120°, or 90°.
  • the angular position of the suction groups 30 depends on the number of sheets 5 which can lay adjacent to each other on the external lateral surface 11 of the folding or interfolding roll 1 .
  • the circular arc arranged between a suction group 30 and the following one is equal to the length of a processed sheet 5 and, therefore, in function of the diameter of the folding or interfolding roll 1 a , or 1 b , it is possible to have two, three, four or even more suction groups 30 .
  • the angular distance between the suction groups 30 will be 72°.
  • the folding or interfolding roll 1 provides 3 suction groups 30 , each of which comprising 2 longitudinal rows of suction holes 3 close to each other.
  • the folding or interfolding roll 1 provides, furthermore, a suction chamber 20 defined within the aforementioned tubular body 10 , and pneumatically connected to a device for generating a predetermined vacuum degree, for example a vacuum pump, not shown in the figures for simplicity, but however of type known to a skilled person in the art. It is, furthermore, provided a vacuum distribution device 50 configured to selectively put into pneumatic communication the suction chamber 20 with at least one row of suction holes 3 of the aforementioned plurality, at predetermined angular positions of the tubular body 10 .
  • a displacement device 70 is provided configured to move the aforementioned vacuum distribution device 50 , in such a way to change the angular position at least of the releasing point P 2 , in particular with respect to a predetermined angular position P 2 * which this occupies with respect to the aforementioned predetermined reference system (Xo,Yo,Zo).
  • the displacement device 70 can be, advantageously, operated by a main control unit 300 , for example comprising a PLC, or an industrial PC, or similar devices, (see for example FIG. 23 ).
  • the main control unit 300 can be interfaced through a panel interface with an operator, for example of the HMI (Human Machine Interface) type, by means of which an operator can give commands and/or adjust the machine 100 .
  • the electronic control unit 300 can, for example, detect the need to adjust the catching point P 1 and/or the releasing point P 2 and communicate to the operator through the HMI the necessary setting. The operator, then, through the HMI, can carry out the adjustment according to the communication of the main control unit 300 .
  • the aforementioned displacement device 70 can be configured to move the aforementioned vacuum distribution device 50 as a function of at least one predetermined working parameter of the machine 100 within which the folding or interfolding roll 1 a , or 1 b is installed.
  • the aforementioned predetermined working parameter can be the advancement speed of the web or sheet of paper along the machine 100 .
  • the displacement device 70 is arranged to move the vacuum distribution device 50 in such a way to anticipate the detachment instant tr of the web or sheet of paper from the folding or interfolding roll 1 a , or 1 b .
  • the displacement device 70 can be configured, in this case, in such a way to rotate the aforementioned vacuum distribution device 50 in the sense opposite to the aforementioned sense of rotation 110 of the folding roll, or about the rotation axis 101 ( FIGS. 7 to 9 ).
  • the displacement device 70 is arranged to move the aforementioned vacuum distribution device 50 in such a way to postpone the release of the web or sheet of paper with respect to a reference condition. More precisely, the displacement device 70 will be, in this case, arranged to rotate the aforementioned vacuum distribution device 50 in the same sense of the aforementioned sense of rotation 110 of the folding roll, or about the rotation axis 101 ( FIGS. 10 to 12 ).
  • the main control unit 300 can be atta a operate the displacement device 70 to cause the rotation desiderata of the vacuum distribution device 50 .
  • the main control unit 300 can operate the displacement device 70 according to a predetermined function or on the basis of algorithms computed in real time, for example self-learning algorithms or, in general, artificial intelligence algorithms.
  • the releasing position of the point P 2 ′ of FIG. 12 can correspond to a slow advancement speed of the paper (for example comprised between 50 and 100 m/min), whilst the releasing position P 2 ′′ of FIG. 12 can correspond to a high advancement speed (for example higher than 250 m/min).
  • a threshold value of the speed can be set beyond which the displacement device 70 can be operated to move the vacuum distribution device 50 from position P 2 ′ to position P 2 ′′ anticipating or postponing, the detachment of the web or sheet of paper 5 .
  • the actuation command of the displacement device 70 can be directly given by the main control unit 300 , or by an operator through the HMI interface.
  • Another working parameter of the machine 100 in function of which the displacement device 70 can be arranged to move the vacuum distribution device 50 can be the thickness s, or the paper weight, of the paper of the processed web or sheet.
  • the displacement device 70 is arranged to move the vacuum distribution device 50 in such a way to anticipate the instant tr at which the web or sheet of paper is released from roll 1 with respect to the releasing reference instant tr*.
  • the displacement device 70 can be arranged to rotate the vacuum distribution device 50 in the sense opposite to the sense of rotation 110 of the tubular body 10 about the longitudinal axis 101 .
  • the displacement device 70 is arranged to move the vacuum distribution device 50 , in such a way to postpone the instant in which the web or sheet of paper is released from roll 1 .
  • the displacement device 70 can be arranged to rotate the vacuum distribution device 50 in a sense of rotation consistent with the sense of rotation of the tubular body 10 about the longitudinal axis 101 .
  • the displacement device 70 can be operated in a different way in function of the type of paper, or product, to be processed obtaining great advantages in terms of setting of the machine 100 during a product change.
  • Each product, or type of paper can correspond to specific movements of the displacement device 70 , or to a specific reference value of the speed of the paper v* optimizing the position of the catching point P 1 and/or of the releasing point P 2 for each specific product, or type of paper.
  • the aforementioned displacement device 70 can be configured to move, in particular to rotate, the vacuum distribution device 50 , in particular to postpone, or anticipate, the instant tr in which the web or sheet of paper is released from surface 11 , in working conditions of the machine 100 , that means during the rotation of the tubular body 10 about the aforementioned longitudinal rotation axis 101 .
  • the aforementioned vacuum distribution device 50 can comprise a fixed tubular body 25 coaxially mounted within the aforementioned tubular body 10 . More in particular, the aforementioned fixed tubular body 25 pneumatically communicates with the device for generating a predetermined vacuum degree and is provided with at least one aperture 26 . More precisely, the vacuum distribution device 50 can comprise, furthermore, a first and a second sealing member 27 a , and 27 b integral to the fixed tubular body 20 at opposite sides with respect to the, or each, aperture 26 and positioned longitudinally to tubular body 10 . In particular, the displacement device 70 can be configured to cause a rotation of the fixed tubular body 25 about the aforementioned longitudinal rotation axis 101 .
  • the aforementioned displacement device 70 can be arranged to engage the fixed tubular body 25 at least at an actuation portion 75 , advantageously a portion which protrudes axially from an end of the tubular body 10 .
  • the displacement device 70 can be arranged to rotate the fixed tubular body 25 in the sense opposite to the predetermined sense of rotation 110 of the tubular body 10 . In this way, in fact, as diagrammatically shown in FIG. 9 , the releasing point P 2 of the sheet of web of paper from the surface 11 of the tubular body 10 , is moved upstream of the reference releasing point P 2 *.
  • the displacement device 70 can be arranged to rotate the fixed tubular body 25 about the longitudinal rotation axis 101 in a sense of rotation consistent with the predetermined sense of rotation 110 of the tubular body 10 to postpone the releasing instant tr of the web or sheet of paper 5 with respect to the reference realising time tr* (see FIGS. 7 to 9 ). In this way, in fact, as diagrammatically shown in FIG. 9 , the releasing point P 2 of the sheet of web of paper from surface 11 of the tubular body 10 is moved downstream of the reference releasing point P 2 *.
  • the catching point P 1 and/or the releasing point P 2 changes with the change of the speed of machine 100 , conveniently anticipating or postponing at least one of the two instants between ta and tr in which the sheets are, respectively, retained and released from the external surface 11 of the folding or interfolding roll, 1 a , or 1 b .
  • any reference is not made to a predetermined speed v* but can be the electronic control unit 300 to be configured to compute the position of the catching point P 1 and/or the releasing point P 2 , in function of the speed of the machine 100 and to operate directly the displacement device 70 , or indirectly by an operator which gives the command through the HMI device.
  • the displacement device 70 can comprise an actuation device 73 .
  • the actuation device 73 can be an actuator, for example a pneumatic actuator, or a mechanical actuator, or an electromechanical actuator.
  • the actuation device 73 can be a motor, in particular an electric motor 73 , provided with a motor shaft (not shown in the figure) arranged to rotate about a rotation axis 173 .
  • the motor shaft of the motor 73 can be arranged to mesh with an endless screw 71 sliding along a sliding direction 171 . More precisely, the endless screw 71 is pivotally connected at an engagement portion 76 to an actuation portion 75 integral to said fixed tubular body 25 .
  • the motor 73 is operated in such a way to cause a rotation of the motor shaft about the rotation axis 173 in a first axis of rotation 172 (see FIG. 15 ).
  • the releasing point P 2 in the case of FIG. 13 also the catching point P 1 , is positioned at an angular position upstream of the angular position of the reference catching point P 2 *. Therefore, the releasing instant tr is anticipated with respect to the reference instant tr* (see also FIG. 9 ).
  • the motor 73 is operated in such a way to cause a rotation of the motor shaft about the rotation axis 173 in a second sense of rotation 172 ′ (see FIG. 17 ).
  • the releasing point P 2 in the case of FIG. 15 also the catching point P 1 , is positioned in an angular position downstream of the angular position of the reference catching point P 2 *. Therefore, the releasing instant tr is postponed with respect to the reference instant tr* (see also FIG. 12 ).
  • a linear electric actuator can be used i.e. an electric motor whose axis can slide instead of rotating. In this way it is possible to connect the axis of the electric motor directly at the engagement portion 76 to the actuation portion 75 integral to the fixed tubular body 25 .
  • the suction chamber 20 is pneumatically connected to the suction holes 3 by a vacuum distribution device 50 equipped with the first and the second sealing member 27 a and 27 b radially oriented and positioned at opposite sides with respect to the, or each, aperture 26 . More in particular, between the first and the second sealing member 27 a and 27 b is not present any other element that is able to close the suction holes 3 . Therefore, the suction chamber is delimited by the first and the second sealing member 27 a and 27 b.
  • the aforementioned vacuum distribution device 50 comprises a fixed tubular body 25 coaxially mounted within of the tubular body 10 and pneumatically communicating with the device for generating a predetermined vacuum degree. More in detail, the fixed tubular body 25 is provided with at least one aperture 26 having a predetermined angular amplitude, in particular an angular amplitude corresponding to the length of the sheet, or of the panel, 5 to be processed, or to the portion of the path that the web or sheet, 5 covers on the roll.
  • the vacuum distribution device 50 comprises in this case a plurality of sealing members 27 integral and positioned longitudinally to the tubular body 10 . More in particular, each sealing member 27 is associated to at least one row of suction holes 3 arranged to pneumatically connect the external surface 11 to the device for generating a predetermined vacuum degree through the aperture 26 . Furthermore, between a sealing member 27 and the following sealing member 27 associated to two different suction groups 30 , annular sealing members 28 can be provided.
  • the displacement device 70 is, advantageously, configured to cause a rotation of the fixed tubular body 25 about the longitudinal rotation axis 101 . More precisely, as shown, for example in detail in FIG.
  • the fixed tubular body 25 can be rotated in the sense opposite to the sense of rotation 110 of the tubular body 10 .
  • the releasing point P 2 will be positioned, going in the sense of rotation 110 , upstream of the angular position of the reference releasing point P 2 *, because the suction holes 3 will leave the web or sheet, 5 in advance with respect to the reference case (diagrammatically shown in figure with a broken line).
  • a first and a second sealing member 27 a and 27 b are provided extending longitudinally to the tubular body 10 between the internal surface 12 and a fixed tubular body 25 .
  • at least one sealing member for example the sealing member 27 b is mounted on a support 21 that can move with respect to the fixed tubular body 25 , for example within a guide 22 peripherally made at the fixed tubular body 25 .
  • the displacement device 70 can be configured to move, in particular rotate about the longitudinal axis 101 , the movable support 21 .
  • the catching position P 1 can be a fixed position and coincident with a reference angular position P 1 *.
  • a first and a second displacement device 70 a and 70 b can be provided, one configured to move the movable support 21 and the other configured to move the tubular body 25 . In this way it is, therefore, possible to change the catching point and the releasing point P 1 and P 2 independently from each other ( FIG. 22 ).
  • the displacement device 70 can comprise a linear actuator, in particular of mechanical, or electric, or electromechanical, or pneumatic, type arranged to cause the vacuum distribution device 50 to rotate against a movable abutment member. In this way, changing the position of the movable abutment member it is possible to adjust the angular position of the vacuum distribution device 50 .
  • a first and a second cutting roll 1 c and 1 d can be provided configured to cut a respective web of paper, respectively, in a predetermined first and second plurality of sheets of predetermined length.
  • first and the second cut roll 1 c and 1 d can be provided with respective displacement devices 70 c and 70 d configured to move, according to one of the embodiments described above with reference to the figures from 4 to 18 of the folding or interfolding rolls, a respective vacuum distribution device 50 in such a way to postpone, or anticipate, depending on the different aim, the releasing point P 2 , and, in case, also the catching point P 1 , of the respective processed web or sheet of paper.
  • the aforementioned reference values are those of a starting condition of the machine, or point of zero
  • the reference points can be computed, preferably, in function of the paper weight, or of the size of the sheets 5 .
  • the catching point P 1 and the releasing point P 2 and/or the releasing instant tr of the detaching fingers 40 a and 40 b are computed by the main control unit 300 through a determined algorithm.
  • the computation can be of threshold speed type, i.e. it is possible to change the catching point P 1 and/or the releasing point P 2 when a predetermined operative speed is exceeded going up or down.
  • the catching point P 1 and/or the releasing point P 2 it is possible to change the catching point P 1 and/or the releasing point P 2 starting from a starting value, or value of zero, computing these in function of the set, or the instantaneous, speed.
  • the function linking the instantaneous speed and the position of points P 1 and P 2 can be of any kind, for example, linear, not linear, or other.
  • the functions can be selected on the basis of the paper weight, or of the size of the sheets fitting the machine 100 to the type of paper, or of product.
  • FIGS. 1 , 2 and 3 are not shown for clarity reasons, it is appropriate to specify that separation members of type known to the skilled person in the art can be, however, provided and configured to carry out the separation of a finished stack of folded or interfolded sheets 250 from the following forming stack 250 .

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Folding Of Thin Sheet-Like Materials, Special Discharging Devices, And Others (AREA)
US18/037,984 2020-11-20 2021-11-19 Folding, or interfolding, unit of a web, or sheet, of paper in a paper converting machine Pending US20230416042A1 (en)

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IT202000027960 2020-11-20
IT102020000027960 2020-11-20
PCT/IB2021/060762 WO2022107074A1 (fr) 2020-11-20 2021-11-19 Unité de pliage ou d'entrepliage d'une bande, ou feuille, de papier dans une machine de transformation de papier

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CA2019183A1 (fr) * 1990-06-18 1991-12-18 Mark Belair Rouleau a vide pour materiel de transformation du papier
ES2179127T3 (es) * 1995-03-03 2003-01-16 Winkler & Dunnebier Ag Rotor para un dispositivo de plegado asi como un aparato de plegado.
IT1394482B1 (it) * 2009-06-04 2012-07-05 Tissuewell S R L Dispositivo per la movimentazione delle dita di piega in una macchina interfoliatrice
US8602198B2 (en) * 2010-12-17 2013-12-10 Kimberly-Clark Worldwide, Inc. Vacuum roll and method of use
IT201600077916A1 (it) * 2016-07-25 2018-01-25 Universal Tissue Tech S R L Rullo piegatore e macchina interfogliatrice impiegante detto rullo
IT201800002342A1 (it) * 2018-02-02 2019-08-02 Perini Fabio Spa Macchina interfogliatrice con diti separatori adiacenti a rispettivi rulli interfogliatori

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WO2022107074A1 (fr) 2022-05-27
EP4247743A1 (fr) 2023-09-27

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