EP0399370A1 - Apparatus for winding webs of material - Google Patents

Apparatus for winding webs of material Download PDF

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Publication number
EP0399370A1
EP0399370A1 EP90109328A EP90109328A EP0399370A1 EP 0399370 A1 EP0399370 A1 EP 0399370A1 EP 90109328 A EP90109328 A EP 90109328A EP 90109328 A EP90109328 A EP 90109328A EP 0399370 A1 EP0399370 A1 EP 0399370A1
Authority
EP
European Patent Office
Prior art keywords
control unit
coil
connecting rods
nip pressure
actuator
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP90109328A
Other languages
German (de)
English (en)
French (fr)
Inventor
Spanio Giampaolo
Mauri Vinicio
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.)
ING L DOLCI SpA
Original Assignee
ING L DOLCI SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ING L DOLCI SpA filed Critical ING L DOLCI SpA
Publication of EP0399370A1 publication Critical patent/EP0399370A1/en
Withdrawn legal-status Critical Current

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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
    • B65H18/00—Winding webs
    • B65H18/08—Web-winding mechanisms
    • B65H18/26—Mechanisms for controlling contact pressure on winding-web package, e.g. for regulating the quantity of air between web layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2404/00—Parts for transporting or guiding the handled material
    • B65H2404/40—Shafts, cylinders, drums, spindles
    • B65H2404/43—Rider roll construction

Definitions

  • the present invention relates to an apparatus for winding material in webs, notably plastic films.
  • An apparatus of this type normally comprises two parallel connecting rods, oscillating around a common horizontal axis, disposed at their lower ends, each with a forked upper end designed to accommodate the ends of a mandrel around which the web-coil is wound. During winding, the coil is pressed against a motorized winding roller which feeds the web.
  • the nip pressure between the coil and the winding roller must be as constant as possible. Obviously the nip pressure varies with the diameter of the coil being wound, mainly due to the increase in weight force of the coil.
  • Regulating devices have therefore been proposed to compensate for the changes in nip pressure. This is done by sensors which directly, or indirectly, measure the actual nip pressure and transmit signals to a control unit that brings the nip pressure back to the set value, controlling the actuators of the oscillating connecting rods, normally consisting of piston-cylinder assemblies.
  • load sensors intended exclusively for direct measurement of the nip pressure, being mounted on the winding roller are affected by the vibrations of the winding roller, accentuated by the possible presence of the kinematic motion for automatic coil changing and by the geometrical irregularity of the coil itself. There­fore, the signals transmitted to the control unit may be inaccurate, causing incorrect adjustment of the nip pressure.
  • Load sensors for indirect measurement of the nip pressure are normally placed at the forked ends of the connecting rods, i.e. on the supports for the coil and measure a component of the weight force of the coil. Load sensors thus positioned are easily damaged if the coils are not handled with care when they are being introduced or discharged.
  • the aim of the in venti on is to overcome the above problems, by proposing a nip pressure regulating device that is extremely simple and far more reliable than those of known design.
  • the actual nip pressure between the coil and the winding roller is determined according to the instantaneous positions of a linear detector connected to the connecting rods, by means of an algorithm entered into a control unit which controls, by means of a proportional hydraulic valve, at least one actuator, preferably a hydraulic piston, for operation of the connecting rods, to correct the nip pressure and maintain it at the predetermined constant value.
  • the linear detector is preferably a linear potentiometer and the nip pressure is determined on the basis of the weight of the coil being wound.
  • the algorithm entered into the control or processing unit to determine the weight of the coil on the basis of the position of the linear potentiometer takes into account the whole geometry of the system and a programming unit is provided to modify the parameters entered into the control unit.
  • the weight of the coil, and therefore the nip force is essentially determined on the basis of measurement of a linear displacement, which means that the apparatus according to the invention is extremely simple and reliable.
  • the linear potentiometer can be integrated with the hydraulic connecting rod actuator, further simplifying the mechanics of the device and reducing its cost.
  • the regulating ring can be closed by placing a load cell on the connecting rod actuator support, to directly measure the actual correction force exerted by the actuator and compare it with the force value transmitted to it by the control unit.
  • a device for winding webs of material notably plastic films, of the type to which the invention refers, comprises two parallel connecting rods 1, only one of which can be seen in the figure, the other being hidden behind the first.
  • the connecting rods 1 oscillate around a lower horizontal axis X and have at their upper ends a fork 2, providing a seat for a respective end of a mandrel 3, on which is formed a coil 4, shown at the start of the winding phase in the attached figure.
  • a motorized winding roller 5 is provided, against the outer surface of which the coil 4 is constantly pressed.
  • the axes of the coil 4 and the winding roller 5 are parallel to the oscillation axis X of the connecting rods 1.
  • a control or processing unit 6 is provided to control a hydraulic actuator 7, notably a piston-cylinder assembly, which actuates connecting rod 1 to compensate for the variations in nip pressure between the coil 4 and the winding roller 5.
  • the input to the control unit is a signal generated by a linear potentiometer 9 which measures the movements of the connecting rod 1 with respect to a reference position corresponding, for example, to the starting position for winding of the coil 4.
  • the linear potentiometer 9 has been illustrated as a separate unit in the attached figure, but it could be integrated with the hydraulic actuator 7.
  • the signals from the linear potentiometer 9 are processed in the control unit 6 on the basis of a predetermined algorithm, which takes into account the geometry of the system, so as to determine the actual weight of the coil 4 and thus the nip pressure between the coil 4 and the winding roller 5.
  • the control unit 6 transmits signals to a proportional hydraulic valve 8, which consequently drives the hydraulic actuator 7 that operates the connecting rod 1.
  • a programming unit 10 is provided for modification of the parameters entered into the control unit 6, for example the nip pressure between the coil 4 and the winding roller 5, the system geometry, the width and charac­teristics of the material being wound.
  • the regulation ring can be closed by providing a load cell 11 on the support of the hydraulic actuator 7 and providing feedback to the control unit 6.
  • the correction force transmitted to the actuator 7 through the proportional valve 8 is constantly compared with the actual correction force exerted by the actuator 7, measured by the load cell 11.

Landscapes

  • Winding Of Webs (AREA)
EP90109328A 1989-05-23 1990-05-17 Apparatus for winding webs of material Withdrawn EP0399370A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT8920599A IT1229851B (it) 1989-05-23 1989-05-23 Dispositivo per avvolgere materiali nastriformi.
IT2059989 1989-05-23

Publications (1)

Publication Number Publication Date
EP0399370A1 true EP0399370A1 (en) 1990-11-28

Family

ID=11169373

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90109328A Withdrawn EP0399370A1 (en) 1989-05-23 1990-05-17 Apparatus for winding webs of material

Country Status (2)

Country Link
EP (1) EP0399370A1 (it)
IT (1) IT1229851B (it)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998055385A1 (en) * 1997-06-03 1998-12-10 Valmet Corporation Method and device in winding of a web
DE20114750U1 (de) * 2001-09-06 2002-11-28 Brueckner Maschbau Anordnung zum Betrieb einer Kontaktwalze
DE10327245A1 (de) * 2003-06-17 2005-01-05 Voith Paper Patent Gmbh Aufwickelvorrichtung
CN103213862A (zh) * 2013-04-26 2013-07-24 浙江晶鑫特种纸业有限公司 一种卷纸机

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2541945A1 (de) * 1975-08-08 1977-02-17 Hiroshi Kataoka Verfahren und vorrichtung zum steuern des beruehrungsdrucks der kontaktwalze einer haspel zum aufwickeln von bahnmaterial
GB2147279A (en) * 1983-10-01 1985-05-09 Reifenhaeuser Masch Winding webs at constant contact pressure
DE3736696A1 (de) * 1987-03-09 1988-09-29 Windmoeller & Hoelscher Verfahren zur regelung des anpressdruckes zwischen einer kontaktwalze und einer von dieser angetriebenen wickelrolle

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2541945A1 (de) * 1975-08-08 1977-02-17 Hiroshi Kataoka Verfahren und vorrichtung zum steuern des beruehrungsdrucks der kontaktwalze einer haspel zum aufwickeln von bahnmaterial
GB2147279A (en) * 1983-10-01 1985-05-09 Reifenhaeuser Masch Winding webs at constant contact pressure
DE3736696A1 (de) * 1987-03-09 1988-09-29 Windmoeller & Hoelscher Verfahren zur regelung des anpressdruckes zwischen einer kontaktwalze und einer von dieser angetriebenen wickelrolle

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998055385A1 (en) * 1997-06-03 1998-12-10 Valmet Corporation Method and device in winding of a web
US6427940B1 (en) 1997-06-03 2002-08-06 Metso Paper, Inc. Method and device in winding of a web
DE20114750U1 (de) * 2001-09-06 2002-11-28 Brueckner Maschbau Anordnung zum Betrieb einer Kontaktwalze
US7095190B2 (en) 2001-09-06 2006-08-22 Bruckner Maschinenbau Gmbh Arrangement for operating a contact roller and associated method for operating a contact roller
DE10327245A1 (de) * 2003-06-17 2005-01-05 Voith Paper Patent Gmbh Aufwickelvorrichtung
CN103213862A (zh) * 2013-04-26 2013-07-24 浙江晶鑫特种纸业有限公司 一种卷纸机

Also Published As

Publication number Publication date
IT8920599A0 (it) 1989-05-23
IT1229851B (it) 1991-09-13

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