EP0798115A1 - Vorrichtung zum Steuern von einer Bahn in einer Druckmaschine - Google Patents

Vorrichtung zum Steuern von einer Bahn in einer Druckmaschine Download PDF

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Publication number
EP0798115A1
EP0798115A1 EP96104907A EP96104907A EP0798115A1 EP 0798115 A1 EP0798115 A1 EP 0798115A1 EP 96104907 A EP96104907 A EP 96104907A EP 96104907 A EP96104907 A EP 96104907A EP 0798115 A1 EP0798115 A1 EP 0798115A1
Authority
EP
European Patent Office
Prior art keywords
web
pressure
applying
printing
determining
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Withdrawn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
EP96104907A
Other languages
English (en)
French (fr)
Inventor
John C. Jackson
Andrew L. Moore
Thaddeus A. Niemiro
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.)
Goss International LLC
Original Assignee
Goss Graphic Systems Inc
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 Goss Graphic Systems Inc filed Critical Goss Graphic Systems Inc
Priority to EP96104907A priority Critical patent/EP0798115A1/de
Publication of EP0798115A1 publication Critical patent/EP0798115A1/de
Withdrawn legal-status Critical Current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

Definitions

  • the present invention relates to control systems for a printing press.
  • a paper web has been unwound from a roll, and passed through the cylinders of a printing press for printing the web.
  • moisture such as ink or other fluids
  • the web absorbs the moisture and laterally fans out, such that the side margins of the web are increased in dimensions between opposed edges of the web.
  • Other factors which may contribute to the fanning out of the web are paper formulation, stretch, printing compression, tension, dampening fluid, and convection drying.
  • the web width of increased lateral dimensions may cause misregistration of the web in the printing units of the press, causing a fault in the location of inks subsequently applied to the web, such as on multi-colored printing press.
  • a rotatable wheel has been applied to a central portion of the web intermediate the side edges of the web in order to tighten the web 10.
  • the wheel is preferably located adjacent a nip between opposed blanket rolls which apply an ink image to the web.
  • both the wheels and air streams require careful adjustment by the operator in order to achieve the desired result, particularly since the devices are preferably placed very close to the nip between the blanket rolls, thus posing possible harm to the operator unless the press is stopped. Thus, these devices are tedious to use, and contribute significantly to undesirable down time of the press in order to perform these adjustments.
  • a principal feature of the present invention is the provision of an improved control system for a web in a printing press.
  • the control system of the present invention comprises, means for applying pressure to the web at a lateral location of the web intermediate opposed side edges of the web, and means for controlling the applying means to apply a selected amount of pressure to the web.
  • a feature of the present invention is that the system automatically corrects the lateral dimensions of the web.
  • Another feature of the invention is that the system prevents the necessity of making tedious adjustments of the web by an operator of the press.
  • Still another feature of the invention is that the system minimizes dawn time of the press.
  • Another feature of the invention is that the system minimizes the possibility of harm to an operator of the press.
  • Yet another feature of the invention is that the system simplifies lateral adjustments of the web.
  • Another feature of the invention is that the system improves the quality of the printed web in the press.
  • Still another feature of the invention is that the amount of pressure by the applying means may be adjusted in an automatic manner.
  • Yet another feature of the invention is that the modification to the width of the web is determined by the speed of the press in an automatic manner.
  • the system may have one or more sensors to detect an edge of the web, and the control system is responsive to the sensor to automatically adjust the width of the web.
  • the web 10 usually has a width L as it is removed from a roll for passage through the press 12.
  • moisture such as ink or other fluids
  • the moisture is absorbed by the web 10
  • the web 10 laterally expands to dimensions L' which may cause misregistration of the web 10 in the press 12.
  • Other factors which may cause fanning out of the web 10 between the lateral dimensions L and L' are paper formulation, stretch, printing compression, ink formulation, tension, dampening fluid, and convection drying.
  • control system 14 in conjunction with a plurality of pressure members 20 spaced laterally across the web 10 between opposed side edges 20a and 20b of the web 10 reduce the lateral width of the web to the dimensions L or other desired dimensions of the web 10.
  • the pressure members 20 are applied to a surface 24 of the web 10 which has opposed surfaces 24 and 26.
  • the printing press 12 may have a plurality of printing units 28, 30, 32, and 34 with different colors of ink, such as yellow Y, cyan C, magenta M, and black K.
  • Each of the printing units may have a pair of plate cylinders 36 and 38 on opposed sides of the web 10 which transfer an ink image to associated blanket cylinders 40 and 42 on opposed sides of the web 10,which in turn place the ink image onto the web 10 during printing by the press 12.
  • the system 14 may have a suitable sensor or transducer 44 to determine the speed of the press 12.
  • one or more of the pressure applying members 20 may be associated with a plurality of the printing units 28, 30, 32, and 34, with the pressure applying members 20 preferably being located adjacent a nip 46 of the blanket cylinders 40 and 42.
  • the pressure member 20 may comprise a rotatable wheel 48 which is mounted by a pin 50 in a movable retaining member 52.
  • the device 20 may have a suitable stepping motor 54 having a driven threaded shaft 56 which is received in a threaded bore 64 of a support member 60.
  • the retaining member 52 has an inwardly directed arm 62 having a threaded bore 58 received on the threaded shaft 56, such that rotational motion of the shaft 56 causes linear movement of the retaining member 52 and wheel 48 in opposite directions along the shaft 56 depending upon the direction of rotation of the shaft 56.
  • the retaining member 52 and associated wheel 48 may be moved towards and away from the web 10 in order to apply a desired amount of pressure by the wheel 48 against then web 10.
  • the wheel 48 thus causes a slight bowing of the web 10 at the pressure location applied to the web 10 by the wheel 48 in order to reduce the lateral dimensions of the web 10, and prevent misregistration of the web 10 relative to the printing units 28, 30, 32, and 34.
  • the system 14 may have a plurality of the rotatable wheels 48 of the pressure members 20 spaced laterally across the web 10, with the pressure of the devices 20 being controlled in order to reduce the lateral dimensions of the web 10 from the distance L' to a modified width L which may be selected as the original width of the web 10 prior to printing.
  • the amount of pressure applied by the wheels 48 may be controlled through use of the stepping motor 54 in order to prevent rupture of the web 10 by the application of excessive pressure by the wheel 48, while still reducing the side margins of the web 10 to prevent misregistration during printing.
  • the support member 62 may have a mechanical stop 66 in order to limit movement of the retaining member 52 and wheel 48 towards the web 10, and thus prevent excessive pressure by the wheel 48 against the web 10.
  • the limit of linear movement by the wheel 48 may be controlled by a suitable computer, as will be discussed below.
  • FIG. 4 Another embodiment of the pressure member 20 is illustrated in Fig. 4, in which like reference numerals designate like parts.
  • the pressure member 20 has a suitable stepping motor 54 with a rotatably driven threaded shaft 56 received in a threaded bore 64 of a support member 60, as previously described.
  • the pressure member 20 has a retaining member 52 having a threaded bore 58 to receive the threaded shaft 56, thus causing linear movement of the retaining member 52 in opposite directions along the shaft 56 depending upon the direction of rotation of the shaft 56 by the stepping motor 54.
  • the retaining member 52 has a channel 68 communicating with a nozzle 70 at one end of the retaining member 52 for passing a suitable fluid, such as air onto a surface of the web 10.
  • the pressure member 20 of this embodiment has a conduit 72 connected to a supply 74 of compressed air, such that the air is passed from the supply 74 through the channel 68 of the retaining member 52, and through the nozzle 70 onto the web 10.
  • the pressure of the fluid from the supply 74 may be modified by a suitable control 76 associated with the supply 74.
  • a desired pressurized stream of air may be directed through the nozzle 70 onto the web 10, and a plurality of these pressure members 20 may be located across the width of the web 10, if desired, in order to shorten the width of the web 10 a desired amount, such as from the distance L' to the distance L, as discussed in connection with Fig. 1.
  • the distance of the nozzle 70 relative to the web 10 may be controlled by the motor 54 through suitable rotation of the shaft 56, thus moving the nozzle 70 towards and away from the web 10, such that the distance between the nozzle 70 and web 10 also controls the reduction in width of the web 10 in order to prevent misregistration of the web 10.
  • FIG. 5 A chart plotting Air Pressure against Press Speed is shown in Fig. 5.
  • the press speed may be determined by the speed sensor 44 in Fig. 1, or by other suitable means.
  • the signal from the speed sensor 44 is electrically connected to a computer 78 or Central Processing Unit (CPU) having a read only memory (ROM) and random access memory (RAM), as shown in Fig. 8.
  • CPU Central Processing Unit
  • ROM read only memory
  • RAM random access memory
  • the air pressure which is required to correct the width of the web 10 varies with the press speed, with three different representative curves C 1 , C 2 , and C 3 being shown.
  • the CPU may change the air pressure supplied by the nozzle 70 against the web 10 a desired amount, such as indicated by the chart of Fig. 5.
  • Values for the different air pressures may be retained in the memory of the computer 78, such that the desired air pressures correspond to values of the press speed., e.g., such as in look up table in the memory of the computer 78.
  • the CPU may control the air pressure, and may also move the nozzle 70 towards or away from the web 10 to modify pressure, depending upon the press speed, as shown in conjunction with Fig. 8.
  • FIG. 6-8 An automatic control system 14 for the press 12 is illustrated in Figs. 6-8, in which like reference numerals designate like parts.
  • the system 14 has a pair of sensing assemblies 80 located adjacent the opposed side edges 22a and b of the web 10.
  • each of the sensor assemblies 80 has a light emitter 82 which directs light towards an associated sensor 84, with the emitter 82 and sensor 84 being located on opposed sides of the web 10.
  • a signal is transmitted to the CPU in order to indicate a fan out condition of the web 10, such as due to moisture applied to the web 10, as previously discussed. Under this condition, either one or both edges of the web 10 may interrupt either one or both of the sensors 84, which condition is indicated to the CPU, as shown in Fig. 8.
  • the CPU directs a modification in the position of the wheel 48, the pressure of the air stream through the nozzle 70, or the position of the nozzle 70 relative to the web 10 in order to correct the lateral dimensions of the web 10 through control of one or more of the pressure members 20.
  • the edges of the web 10 will become spaced inwardly from the sensors 84, thus indicating by the absence of a signal from the sensors 84 to the CPU that the lateral dimensions of the web 10 are in a desired condition to prevent misregistration of the web 10.
  • an automatic control system 14 is provided to sense the locations of the side edges of the web 10, and correct the lateral dimensions of the web 10 in an automatic manner.
  • the system 14 of the present invention simplifies adjustment of the web 10, and eliminates the tedious adjustments and down time previously required by the press 12.
  • the system 14 has a first set of sensors 84 located at the opposed edges 22a and b of the web 10 in order to monitor the web 10 in its dry condition.
  • the sensors 84 measure the side edges 22a and b before the web 10 passes to the printing units 28, 30, 32, and 34.
  • Another set of sensors 84' are positioned adjacent the side edges 22a and b after the web 10 passes from the last printing unit 34, such that the sensors 84' measure the web 10 in its moistened condition after printing in order to determine the two differences between the dry and moistened web width Delta s 1 and Delta s 2 adjacent both side edges of the web 10.
  • the sensors 84 and 84' all have suitable light emitters associated with the sensors 84 and 84', as previously described.
  • the measured sum Delta S 1 and Delta S 2 is then utilized by the CPU to control the pressure members 20 in order to reduce the width of the moistened web 10 by the system 14, with the pressure members 20 being located between one or more than one of the printing units 28, 30, 32, and 34, as shown.
  • the system 14 controls the width of the web in an automatic manner.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Rotary Presses (AREA)
EP96104907A 1996-03-27 1996-03-27 Vorrichtung zum Steuern von einer Bahn in einer Druckmaschine Withdrawn EP0798115A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP96104907A EP0798115A1 (de) 1996-03-27 1996-03-27 Vorrichtung zum Steuern von einer Bahn in einer Druckmaschine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP96104907A EP0798115A1 (de) 1996-03-27 1996-03-27 Vorrichtung zum Steuern von einer Bahn in einer Druckmaschine

Publications (1)

Publication Number Publication Date
EP0798115A1 true EP0798115A1 (de) 1997-10-01

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP96104907A Withdrawn EP0798115A1 (de) 1996-03-27 1996-03-27 Vorrichtung zum Steuern von einer Bahn in einer Druckmaschine

Country Status (1)

Country Link
EP (1) EP0798115A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2048101A2 (de) * 2007-10-13 2009-04-15 manroland AG Verfahren zum Betreiben einer Rollendruckmaschine
CN110065301A (zh) * 2018-01-23 2019-07-30 海德堡印刷机械股份公司 穿孔对版

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0424330A2 (de) * 1989-10-16 1991-04-24 GRAFIKONTROL CONTROLLI GRAFICI E INDUSTRIALI S.p.A. Verfahren und Vorrichtung zum Kontrollieren von Breitenänderungen in lÀ¤ngsbewegenden Bahnen, insbesondere für Papierbahnen während des Druckens
DE4327646A1 (de) * 1992-10-23 1994-04-28 Tokyo Kikai Seisakusho Tokio T Breiten-Einstellvorrichtung und -verfahren für eine Papierbahn sowie damit ausgerüstete lithographische Rotationspresse

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0424330A2 (de) * 1989-10-16 1991-04-24 GRAFIKONTROL CONTROLLI GRAFICI E INDUSTRIALI S.p.A. Verfahren und Vorrichtung zum Kontrollieren von Breitenänderungen in lÀ¤ngsbewegenden Bahnen, insbesondere für Papierbahnen während des Druckens
DE4327646A1 (de) * 1992-10-23 1994-04-28 Tokyo Kikai Seisakusho Tokio T Breiten-Einstellvorrichtung und -verfahren für eine Papierbahn sowie damit ausgerüstete lithographische Rotationspresse

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2048101A2 (de) * 2007-10-13 2009-04-15 manroland AG Verfahren zum Betreiben einer Rollendruckmaschine
EP2048101A3 (de) * 2007-10-13 2010-12-15 manroland AG Verfahren zum Betreiben einer Rollendruckmaschine
CN110065301A (zh) * 2018-01-23 2019-07-30 海德堡印刷机械股份公司 穿孔对版

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