EP0084939A1 - Procédé et dispositif d'impression à intervalles de répétition variables - Google Patents

Procédé et dispositif d'impression à intervalles de répétition variables Download PDF

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Publication number
EP0084939A1
EP0084939A1 EP83300158A EP83300158A EP0084939A1 EP 0084939 A1 EP0084939 A1 EP 0084939A1 EP 83300158 A EP83300158 A EP 83300158A EP 83300158 A EP83300158 A EP 83300158A EP 0084939 A1 EP0084939 A1 EP 0084939A1
Authority
EP
European Patent Office
Prior art keywords
web
print cylinder
roller
images
print
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Withdrawn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
EP83300158A
Other languages
German (de)
English (en)
Inventor
David Alexander Brian
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.)
Rofrep Ltd
Original Assignee
Rofrep Ltd
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 Rofrep Ltd filed Critical Rofrep Ltd
Publication of EP0084939A1 publication Critical patent/EP0084939A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • B41F13/04—Conveying or guiding webs through presses or machines intermittently
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary presses or machines

Definitions

  • the invention relates to printing, and particularly to the printing of a succession of images on to an elongate web.
  • Such printing is commonly done by feeding the web past a rotating print cylinder which bears a printing plate.
  • the repeat distance i.e. the distance,between any point on one image and the identical point on the succeeding image, is of course dependent on the circumference of the print cylinder.
  • the repeat distance for example in order to change from the printing of a succession of images of one size to the printing of a succession of larger or smaller images, it is necessary to change the cylinder.
  • the invention provides a method of printing a succession of images on to an elongate web, comprising feeding the web past a rotating print cylinder, characterised in that the relative motion of the cylinder and the web is controlled to vary as desired the repeat distance between adjacent images.
  • the print cylinder is rotated at a constant speed and the movement of the web past the print cylinder is periodically interrupted, the length of the interruptions controlling the repeat distance.
  • the interruptions are preferably controlled by switching means associated with the print cylinder.
  • switch means may be mounted adjacent to the print cylinder, there being switch actuating means on the print cylinder.
  • switch actuating means on the print cylinder.
  • means may be provided to control the length of web which is fed past the print cylinder between successive interruptions.
  • the means comprise drive means for the web and means to control the movement of the drive means.
  • the drive means may comprise at least one roller for driving the web, and means operable to permit the roller to rotate by a preselectable amount.
  • a rotatable switch device may be provided which is arranged to rotate by a predetermined amount, e.g. one revolution, between interruptions, the roller being connected to the switch device by a variable speed gearbox, so that the amount by which the roller rotates during the predetermined rotation of the switch device can be controlled as desired.
  • means may be provided to generate signal pulses as the roller rotates, there being means to stop rotation of the roller after a predetermined number of pulses has been generated.
  • the roller may be rotatable with a disc having a series of holes spaced apart circumferentially around the disc, a generator and receiver being respectively arranged at opposite sides of the disc so that each time a hole passes the generator and receiver a signal is generated.
  • interruption of the movement of web during subsequent runs is preferably carried out by sensing the position of the initial images, for example using a light sensitive device.
  • the invention includes a printing machine comprising a rotatable print cylinder, means for feeding an elongate web past a print cylinder when rotating to receive a succession of images, and means to control relative movement between the print cylinder and the web to vary the repeat distance between adjacent images.
  • the embodiments of the invention described are concerned with a reel to reel printing machine for applying printed matter to a succession of plastics (e.g. polythene) or paper bags whilst the bags are still in web form.
  • a portion of web is illustrated at 10 in Figure 1 and the machine has a pair of nip rollers 11 for driving the web from right to left as viewed in the Figure.
  • the payout reel and the takeup reel of the machine, together with their associated equipment, are conventional and are not therefore.shown or described in detail.
  • Printing is carried out by means of a rotatable print cylinder 12 and a co-operating impression cylinder 13.
  • Printing blocks such as 14 can be attached to the print cylinder 12 so that as the web 10 is moved past the rotating cylinder 12 the printing plate 14 applies an image to the web 10.
  • the print cylinder 12 and nip rollers 11 are run continuously.
  • the machine is shown in Figure 1 at the start of printing a first bag.
  • the web 10 is stationary and the leading edge 14a of the printing plate 14 is approaching the web.
  • a proximity switch 15 is positioned at a fixed point adjacent the print cylinder 12 and as shown in Figure 1 an activating device 16, fixed to the print cylinder, is approaching the switch 15.
  • the activating device 16 reaches the switch 15 slightly before the leading edge 14a of the printing plate reaches the web 10.
  • the effect of the device 16 on the switch 15 is to commence the rotation of the nip rollers 11 which then drive the web 10 past the print cylinder 12 thus causing the printing plate 14 to make contact with the web and print one bag.
  • any length of bag, up to the maximum, can be printed without removing the print cylinder 12.
  • the angular position of the arm 18 with respect to the device 16 is adjustable so that the length of time for which movement of the web is interrupted can be adjusted to suit different sizes of printing plates.
  • interruption of the movement of the web is controlled not by the arm 18, but by a light sensitive device 19 positioned in the path of the web.
  • the device 19 senses the leading edge of one of the images and stops the web. Re-starting is carried out as before, the device 16 actuating the switch 15 as the leading edge 14a of the printing plate approaches the web.
  • the position of the device 19 is adjustable in the direction of movement of the web to suit different lengths of image but fine . adjustment is carried out by adjusting the position of the switch 15.
  • the device 19 responds only to a leading edge, it is only energised momentarily, and this energisation can be carried out by arranging a third switch 21 adjacent the path which is followed by the end 17 of the arm 18. When the arm passes the switch 21 it momentarily energises the device 19.
  • the cylinders 12 and 13 can be continuously driven from the main drive shaft (not shown) via chains (not shown).
  • the main drive shaft is also used to transmit drive continuously by means of a chain (not shown) to a conventional clutch brake device 22.
  • the device 22 is connected to the lower nip roller 11 by means of a chain 23 and the lower roller 11 drives the upper roller 11 via a gear device which is not visible in Figure 2.
  • a proximity switch 15 is positioned at a fixed point adjacent to the print cylinder 12 and as shown in Figure 2 an activating device 16, fixed to the print cylinder, is approaching the switch 15.
  • the activating device 16 reaches the switch 15 somewhat before the leading edge 14a of the printing plate reaches the web 10.
  • the effect of the device 16 on the switch 15 is to engage the clutch 22 to transmit drive to the nip rollers 11. They then drive the web 10 past the print cylinder 12 thus causing the printing plate 14 to make contact with the web and print one bag.
  • the web 10 thus waits until the leading edge 14a of the printing plate 14 comes round again, whereupon the effect of device 16 on switch 15 causes the cycle to repeat itself.
  • one of the rollers 11 is connected to a rotatable switch device 24 via a variable speed gear box 25.
  • the device 24 comprises a disc with a switch 26 adjacent its periphery. The device is such that once rotation of . the disc 24 is commenced the disc will perform one revolution and then emit a signal to stop the nip rollers.
  • the control 27 can be used to adjust the extent to which the nip rollers 11 revolve during one cycle, and hence the length of web that is fed during one cycle, to make the length of web which is fed suit the size of the printing plate 14.
  • the measurement of the length of web that is fed is thus carried out in effect by the disc 24 and as rotation of this disc does not commence until rotation of the nip rollers 11 commences, any slip of the clutch of the device 22 does not effect the length of web that is fed.
  • Figure 4 illustrates an alternative embodiment in which one of the nip rollers 11 is rotatable with a disc 28 which has a plurality of holes 29 therethrough, the holes being spaced apart around the periphery of the disc.
  • a transmitter 30 and receiver 31 On opposite sides of the disc are mounted a transmitter 30 and receiver 31. They may for example comprise a photo cell and light source, or an infra-red transmitter and receiver, or the like. Thus whenever a hole 29 passes the transmitter and receiver, a signal pulse is generated.
  • a digital counter (not shown) is provided which is operable to stop the nip rollers 11 after a preselected number of pulses has been generated.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
EP83300158A 1982-01-20 1983-01-13 Procédé et dispositif d'impression à intervalles de répétition variables Withdrawn EP0084939A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB8201605 1982-01-20
GB8201605 1982-01-20
GB8207967 1982-03-18
GB8207967 1982-03-18

Publications (1)

Publication Number Publication Date
EP0084939A1 true EP0084939A1 (fr) 1983-08-03

Family

ID=26281768

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83300158A Withdrawn EP0084939A1 (fr) 1982-01-20 1983-01-13 Procédé et dispositif d'impression à intervalles de répétition variables

Country Status (1)

Country Link
EP (1) EP0084939A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0183336A2 (fr) * 1984-11-27 1986-06-04 Moore Business Forms, Inc. Ligne modulaire de traitement de bande à format variable et module
EP0225727A3 (en) * 1985-11-27 1989-01-25 Moore Business Forms, Inc. Size independent modular web processing line and modules
US4966075A (en) * 1986-05-01 1990-10-30 Cobden Chadwick Limited Multi-color printing method and apparatus with registration means
EP0649740A1 (fr) * 1993-09-17 1995-04-26 De La Rue Giori S.A. Unité d'impression pour une machine d'impression à bobine

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2140834A (en) * 1937-09-07 1938-12-20 Marshall E Gazette Printing apparatus
DE754886C (de) * 1940-03-14 1953-03-23 Aeg Vorrichtung zum selbsttaetigen Feststellen von Passerunterschieden in Mehrfarbenrotationsdruckmaschinen
US3498514A (en) * 1968-09-23 1970-03-03 Standard Register Co High speed web feed apparatus
DE2617418A1 (de) * 1975-04-29 1976-11-11 Seailles & Tison Const Mec Vorschubsteuervorrichtung
DE2827942A1 (de) * 1978-06-26 1980-01-10 Bhs Bayerische Berg Verfahren und vorrichtung zum bedrucken und/oder praegen einer sich bewegenden bahn oder bahnteilen

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2140834A (en) * 1937-09-07 1938-12-20 Marshall E Gazette Printing apparatus
DE754886C (de) * 1940-03-14 1953-03-23 Aeg Vorrichtung zum selbsttaetigen Feststellen von Passerunterschieden in Mehrfarbenrotationsdruckmaschinen
US3498514A (en) * 1968-09-23 1970-03-03 Standard Register Co High speed web feed apparatus
DE2617418A1 (de) * 1975-04-29 1976-11-11 Seailles & Tison Const Mec Vorschubsteuervorrichtung
DE2827942A1 (de) * 1978-06-26 1980-01-10 Bhs Bayerische Berg Verfahren und vorrichtung zum bedrucken und/oder praegen einer sich bewegenden bahn oder bahnteilen

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0183336A2 (fr) * 1984-11-27 1986-06-04 Moore Business Forms, Inc. Ligne modulaire de traitement de bande à format variable et module
EP0183336A3 (en) * 1984-11-27 1986-09-24 Moore Business Forms, Inc. Size independent modular web processing line and modules
US4839814A (en) * 1985-01-29 1989-06-13 Moore Business Forms, Inc. Size independent modular web processing line and modules
EP0225727A3 (en) * 1985-11-27 1989-01-25 Moore Business Forms, Inc. Size independent modular web processing line and modules
US4966075A (en) * 1986-05-01 1990-10-30 Cobden Chadwick Limited Multi-color printing method and apparatus with registration means
GB2190042B (en) * 1986-05-01 1990-11-21 Rofrep Ltd Printing of successive images onto an elongate web.
EP0649740A1 (fr) * 1993-09-17 1995-04-26 De La Rue Giori S.A. Unité d'impression pour une machine d'impression à bobine
CN1051281C (zh) * 1993-09-17 2000-04-12 吉奥里街股份有限公司 用于卷筒纸印刷机的印刷部件

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): AT BE CH DE FR GB IT LI LU NL SE

17P Request for examination filed

Effective date: 19840131

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19860627

RIN1 Information on inventor provided before grant (corrected)

Inventor name: BRIAN, DAVID ALEXANDER