EP1439059A1 - Vorrichtung zur Stabilisierung der Spannungen in einem zu druckenden Film - Google Patents

Vorrichtung zur Stabilisierung der Spannungen in einem zu druckenden Film Download PDF

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Publication number
EP1439059A1
EP1439059A1 EP03425021A EP03425021A EP1439059A1 EP 1439059 A1 EP1439059 A1 EP 1439059A1 EP 03425021 A EP03425021 A EP 03425021A EP 03425021 A EP03425021 A EP 03425021A EP 1439059 A1 EP1439059 A1 EP 1439059A1
Authority
EP
European Patent Office
Prior art keywords
rollers
film
roller
straight line
tensions
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Withdrawn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
EP03425021A
Other languages
English (en)
French (fr)
Inventor
Giovanni Balasini
Carlo Manenti
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.)
Tcm Tecno Converting Machinery Srl
Original Assignee
Tcm Tecno Converting Machinery Srl
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 Tcm Tecno Converting Machinery Srl filed Critical Tcm Tecno Converting Machinery Srl
Priority to EP03425021A priority Critical patent/EP1439059A1/de
Publication of EP1439059A1 publication Critical patent/EP1439059A1/de
Withdrawn legal-status Critical Current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
    • B65H23/00—Registering, tensioning, smoothing or guiding webs
    • B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
    • B65H23/18—Registering, tensioning, smoothing or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web
    • B65H23/188—Registering, tensioning, smoothing or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web in connection with running-web
    • B65H23/192—Registering, tensioning, smoothing or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web in connection with running-web motor-controlled
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/02—Conveying or guiding webs through presses 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
    • B65H20/00—Advancing webs
    • B65H20/02—Advancing webs by friction roller
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H20/00—Advancing webs
    • B65H20/24—Advancing webs by looping or like devices

Definitions

  • the present invention refers to the field of film printing, and in particular to a device able to stabilise or reduce tensions during printing of plastic films.
  • Tensions in film can involve overlapping of the printed parts.
  • the second printing does not occupy the space intended for it, but is printed on the preceding one, causing an error in the process.
  • Such errors are normally known as register errors.
  • the tensioning system comprises a driven roller, a motor that drives the driven roller and a pressing roller opposed to the driven roller.
  • the speed of rotation of the driven roller which must be synchronous with the speed of the draw rollers situated downstream from the printing units, is decided according to the type of sheet to be printed and to the size thereof. In this manner the same force is given to the sheet downstream and upstream of the printing operation and any tensions or sagging of the sheet is avoided.
  • Said tensioning device allows the tensions due to the mechanical devices situated downstream of said device to be stabilised, but it does not allow removal of defects caused upstream of said tensioner or caused by the quality of the material.
  • the register error is caused by unevenness in pulling of the film, that is to say if the tensions in the film are caused by the unwinding or supporting rollers not being perfectly centred with respect to their own axis of rotation or by rolls for unwinding that are deformed by the weight of the wound material, the register error is repeated cyclically in the printing causing an error that is variable in time and therefore difficult to control.
  • Said correction can therefore be done through a dynamic register correcting device which, with the aid of particular sensors designed to detect the position of the prints and various electronic automatisms, controls the adjustment of the print registers.
  • the object of the present invention is to solve the problems of the prior art by providing a device that is able to stabilise or reduce film tensions, whether due to the process or to the material.
  • Another object of the present invention is to provide a device that allows film tensions to be stabilised also upstream of the printing machine.
  • Another object of the present invention is to provide a device that allows film tensions to be stabilised and at the same time is simple and cheap to make.
  • a device for stabilising, according to the present invention tensions in a film to be printed is disposed between a film unwinding unit and the printing units of a printing machine and is characterised in that it comprises a first set of rollers and a second set of rollers opposed to and offset with respect to the rollers of said first set. All the rollers are driven by motor means and disposed so that the film passes therebetween following a winding course, winding round at least the inside rollers between an input roller and an output roller for at least 180°.
  • Such a device allows film tensions to be stabilised or at least substantially reduced.
  • the device according to the present invention allows obtaining an unrolled film to be printed that is completely flat, i. e. that is free from all tensions typical of the material.
  • all the rollers have the same radius and are positioned on a first and on a second parallel straight line so that the centres of rotation of the rollers lie on the first or on the second straight line and the rollers of the first straight line are offset by a distance equal to at least one radius with respect to the rollers of the second straight line.
  • the device comprises a number of rollers ranging from 6 to 11.
  • the device preferably comprises nine rollers, four of which are positioned on the first straight line, forming the first set of rollers, and five are positioned on the second straight line, forming the second set.
  • nine rollers four of which are positioned on the first straight line, forming the first set of rollers, and five are positioned on the second straight line, forming the second set.
  • one of the rollers is set in rotation by motor means and draws the other rollers into rotation by means of a drive system.
  • the device comprises at least one pressing roller opposed to the last roller and operated by a cylinder-piston assembly.
  • the device advantageously comprises adjustment means able to vary the reciprocal distance between the rollers.
  • Figure 1 a device for stabilising or reducing tensions in a film to be printed according to the present invention, indicated as a whole with reference numeral 1, is illustrated.
  • the device 1 comprises a first set of rollers 3, 5, 7, 9 and a second set of rollers 4, 6, 8, 10, opposed and offset with respect to the first set.
  • the device 1 is disposed upstream of a printing machine, therefore it is situated between the film unwinding unit (not shown) and the printing units (not shown).
  • all the rollers 2-10 of the drawing device 1 have the same radius and are driven at the same speed by a motor and by a drive system described hereunder.
  • the rollers 2-10 are disposed with their centres on two parallel straight lines, a first straight line 12, respectively a second straight line 13, in an offset manner, that is so that the centres of rotation of the rollers 3, 5, 7, 9 disposed on the first straight line 12 are offset by a distance little greater than the radius with respect to the rollers 2, 4, 6, 8, 10 disposed on the second straight line 13.
  • the rollers are disposed so that the distance between each roller of the first straight line 12 and each roller of the second straight line 13 is such as to allow the passage of the film to be printed in contact with only one of the opposed rollers; obviously said distance can be regulated according to the film to be processed.
  • the distance between rollers of the same straight line that is to say between the rollers whose centres of rotation lie on the same straight line, is also chosen so as to allow free passage of the film to be processed.
  • the plastic film coming from the unwinding roller as shown in Figure 1, winds round the input roller 2 of the device for more than 180°, passing through the gap between said roller 2 and roller 4, and proceeds by winding around roller 3 for about 270°.
  • the film After having passed through the gap between said roller 3 and roller 5, the film detaches from roller 3 to wind round roller 4. Subsequently, after having wound round roller 4 for about 270° and having passed through the gap between said roller 4 and roller 6, the film leaves roller 4 to wind round roller 5.
  • the path of the film proceeds thus up to exit roller 10 of the device, winding round all the rollers for more than 180°, with a winding course that passes from a roller of the first straight line 12 to a roller of the second straight line 13.
  • the device 1 described behaves like a set of drawing calenders wherein each roller draws the film by friction, eliminating any tensions present on the portions thereof.
  • the device acting as a mechanical filter for the tensions, distributes the tensions encountered over the whole length of the film passing there through, making the film leaving the device perfectly flat and substantially free from variations in tension, as shown by the graph illustrated in Figure 3b.
  • the arrangement of the rollers and the number thereof is such as to allow a large friction surface between the rollers and the film, which allows a perfect smoothing of the tensions in the latter.
  • the device 1 according to the present invention comprises nine rollers, four of which are positioned on the first straight line 12 and five on the second straight line 13. Although said number of opposed rollers is the optimal one, it has, however, been observed that a different number, but in any case no less than six, may be sufficient to realise the device 1 according to the present invention.
  • a nip roller 14 driven by a cylinder-piston assembly 15 is opposed to the last roller 10, that is to the exit roller 10.
  • the nip roller 14 does not serve, as in the prior art, to turn at the same speed as the draw rollers positioned downstream of the print assemblies to impart a certain tension to the film to be printed, but serves only to ensure that any slipping of the film on the draw rollers does not lead to variations in the speed thereof.
  • the direct consequence of said variations in speed is the formation of tensions inside the film.
  • said slipping could occur only exceptionally if the surface of the film and the surface of the rollers fail to guarantee perfect friction through adhesion.
  • the roller 10 is keyed on the shaft of a motor of a know type, such as, for example, a brushless motor that can be adjusted according to the speed of the draw rollers situated downstream of the print units.
  • a motor of a know type such as, for example, a brushless motor that can be adjusted according to the speed of the draw rollers situated downstream of the print units.
  • the other rollers of the device 1 for reducing tensions are drawn into rotation by a drive system consisting of a belt 17 wound in a winding course and two adjustable tensioning rollers 18.
  • the belt 17 winds around the roller 10 keyed to the motor shaft and the remaining rollers, passing from a roller disposed on the first straight line 12 to a roller disposed on the second straight line 13 and following therefore the course of the plastic film.
  • the two tensioning rollers 18 can be adjusted by appropriate means 19 to allow the tension on the drive belt 17 to be varied.
EP03425021A 2003-01-17 2003-01-17 Vorrichtung zur Stabilisierung der Spannungen in einem zu druckenden Film Withdrawn EP1439059A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP03425021A EP1439059A1 (de) 2003-01-17 2003-01-17 Vorrichtung zur Stabilisierung der Spannungen in einem zu druckenden Film

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP03425021A EP1439059A1 (de) 2003-01-17 2003-01-17 Vorrichtung zur Stabilisierung der Spannungen in einem zu druckenden Film

Publications (1)

Publication Number Publication Date
EP1439059A1 true EP1439059A1 (de) 2004-07-21

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP03425021A Withdrawn EP1439059A1 (de) 2003-01-17 2003-01-17 Vorrichtung zur Stabilisierung der Spannungen in einem zu druckenden Film

Country Status (1)

Country Link
EP (1) EP1439059A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007024610A1 (de) * 2007-05-25 2008-12-04 Koenig & Bauer Aktiengesellschaft Verfahren und Vorrichtung zum Antrieb eines mehrlagigen Papierstrangs in einer Rotationsdruckmaschine

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4569285A (en) * 1983-04-29 1986-02-11 Officine Meccaniche Giovanni Cerutti S.P.A. Device for shifting a compensator roller in a printing press
US4778093A (en) * 1987-04-13 1988-10-18 Walter Renold Film transport assembly

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4569285A (en) * 1983-04-29 1986-02-11 Officine Meccaniche Giovanni Cerutti S.P.A. Device for shifting a compensator roller in a printing press
US4778093A (en) * 1987-04-13 1988-10-18 Walter Renold Film transport assembly

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007024610A1 (de) * 2007-05-25 2008-12-04 Koenig & Bauer Aktiengesellschaft Verfahren und Vorrichtung zum Antrieb eines mehrlagigen Papierstrangs in einer Rotationsdruckmaschine
DE102007024610B4 (de) * 2007-05-25 2011-05-12 Koenig & Bauer Aktiengesellschaft Vorrichtung zum Antrieb eines mehrlagigen Papierstrangs in einer Rotationsdruckmaschine

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