EP0344546A2 - Regelvorrichtung für das Öffnen eines Farbwerks in einer Druckmaschine - Google Patents

Regelvorrichtung für das Öffnen eines Farbwerks in einer Druckmaschine Download PDF

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Publication number
EP0344546A2
EP0344546A2 EP89109053A EP89109053A EP0344546A2 EP 0344546 A2 EP0344546 A2 EP 0344546A2 EP 89109053 A EP89109053 A EP 89109053A EP 89109053 A EP89109053 A EP 89109053A EP 0344546 A2 EP0344546 A2 EP 0344546A2
Authority
EP
European Patent Office
Prior art keywords
movement
actuator
roller
inkwell
axis
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Withdrawn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
EP89109053A
Other languages
English (en)
French (fr)
Other versions
EP0344546A3 (de
Inventor
Gilbert Mischler
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.)
Bobst Mex SA
Original Assignee
Bobst SA
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 Bobst SA filed Critical Bobst SA
Publication of EP0344546A2 publication Critical patent/EP0344546A2/de
Publication of EP0344546A3 publication Critical patent/EP0344546A3/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Withdrawn legal-status Critical Current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
    • B41F31/00—Inking arrangements or devices
    • B41F31/02—Ducts, containers, supply or metering devices
    • B41F31/04—Ducts, containers, supply or metering devices with duct-blades or like metering devices
    • B41F31/045—Remote control of the duct keys
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/0036—Devices for scanning or checking the printed matter for quality control
    • B41F33/0045—Devices for scanning or checking the printed matter for quality control for automatically regulating the ink supply
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2231/00—Inking devices; Recovering printing ink
    • B41P2231/12—Axially segmented ink blades

Definitions

  • the present invention relates to a device for controlling the opening of an inkwell in a printing machine making it possible to modulate the quantity of ink delivered to an inkwell roller and transmitted by distributor rollers to the printing plate.
  • the quality of the print run in offset printing machines depends on multiple parameters, the main ones being: the chemical characteristics and the structure of the paper surface, the quality of the pre-wetting of the plate mounted on the cylinder plate, printing speed and quality as well as quantity of printing inks delivered by an inking system. More precisely, the quantity of ink transferred to the printing plate must correspond to the minimum quantity necessary to ensure correct printing, and, as far as possible, this quantity must be compensated laterally and longitudinally according to the unevenness of consumption d ink that meets the requirements for a given image.
  • the inkwell of an offset printing machine is frequently in the form of a very wide bowl with an oblique bottom, the wall opposite the oblique bottom is formed by the rotary ink roller itself.
  • the opening of the inkwell, through which the ink is delivered, is then formed by the gap located at the bottom of the bowl between the inkwell roller and a scraper blade covering the lower edge of the oblique bottom.
  • this scraper blade is in one piece tangential to the ink roller. Its longitudinal edge outside is then more or less close to the inkwell roller thanks to a series of equidistant underlying adjustment screws.
  • the major drawback of this device is the impossibility of fine adjustment at one point without affecting the adjacent points. In practice, this prevents an exact calibration of the quantity of ink to be delivered for the printing of a page having strong vertical contrasts.
  • each strip constitutes the short branch of a lever mounted in rotation along an axis close to the ink roller and whose long vertical branch oriented downwards is moved laterally by an intermediate piece in which turns a horizontal worm screw actuated by an electric motor.
  • a spring permanently holds the long branch against the intermediate piece.
  • an adjustment piece is moved in line over infinitesimal distances using a screw having two threads with different pitches: one screwed into the frame, the other in the intermediate piece .
  • This screw is driven by a synchronous reciprocating motor through a gear reducer.
  • this device Given the small movements at the outlet of the reduction gear, this device can only be controlled in position on a movement measurement taken on a second reduction gear output, measurement not taking into account any mechanical play inside this reduction gear in the output shaft / screw connection with differential thread and at the corresponding threads and tapped holes.
  • this device is complex and therefore costly to manufacture and maintain.
  • the object of this invention is to solve the aforementioned problems by means of a device for rapid and precise control of the opening of an inkwell in an offset printing machine allowing an exact supply of the quantity of ink delivered to the roller. '' rotary inkwell of the plate inking system.
  • This device must involve a minimum of mechanical connection to reduce the uncertainties due to operating clearances as well as the cost of manufacturing and maintenance.
  • the initial implementation of this device must be facilitated by a possibility of rapid control of the opening to a reference value and easy adjustment of this opening relative to the external members.
  • This device must also allow other essential parameters to be taken into account for good inking such as the physico-chemical characteristics of the ink and of the paper.
  • a device in a printing machine the inkwell of which is in the form of a bowl with an oblique bottom oriented towards a rotary inkwell roller constituting the last face of the bowl, the opening at bottom of the bowl being defined by the interstices between the ink roller and a series of movable strips orthogonally to the roller, arranged, at the end of the oblique bottom close to the roller, side by side in a plane to form a blade of scraping parallel to this roller, thanks to a control device comprising for each strip: - a linear positioning actuator whose axis of movement is aligned with the axis of movement of the strip at the rear edge of which it is connected by an intermediate piece and whose casing, possibly contained inside a module , is made integral with the inkwell thanks to a frame, means for detecting a reference position and each movement of the axis of movement relative to the casing of the actuator, - control means triggering, according to the electrical control signals which are applied
  • this device also includes computer means allowing an operator to define, from a keyboard and a screen and taking into account various parameters such as distribution of the condensed images on the page, characteristics of the ink and paper, the possible modification (s) of the position of one or more specific lamellae over time, translate these modifications in terms of direction and quantity of movement axis movement unit for each corresponding actuator under the form of electrical control signals which are transferred to electronic pre-amplification and interface means, which means organize the routing of the electrical control signals to each control means of the actuators concerned along an omnibus line connecting all these control means to the electronic pre-amplification and interface means.
  • the plane defined by the series of strips arranged side by side constituting the scraper blade passes through a plane intersecting the ink roller.
  • This intersecting plane could advantageously pass through the axis of rotation of the ink roller.
  • the position, relative to the bowl of the inkwell, of the frame supporting the actuator can be adjusted by means of a screw having two threads of different pitch, one screwed into a tapped hole in the frame, the other screwed into a tapped hole in the bowl, and this before blocking this frame against the bowl by mechanical means.
  • a scraper blade 169 is constituted by a series of blades 170 arranged side by side in a plane. Each of these blades 170 is connected at its rear to the movement axis 150 of its corresponding actuator module 140. The latter can communicate to it, while maintaining it in the plane of the scraper blade, a movement of advance or withdrawal with respect to the ink roller not shown.
  • Each actuator module 140 includes in series inside a control card 215 receiving electrical control signals from the omnibus line 230 to which is connected a power amplifier 210 translating the control pulses processed by the card 215 into electrical power switching on. the actual actuator 200 which moves the axis of movement 150.
  • a detector 220 reports through line 221 to the card 215 each movement carried out by this axis 150. This detector 220 also establishes the presence or not of this axis 150 in a reference position.
  • All the actuator modules 140 actuating a strip 170 belonging to the series constituting the same blade 169 are connected by an omnibus line 230 to a pre-amplification and interface card 240.
  • This omnibus line 230 is in fact made up of a number reduces, for example five, cables in parallel, each control card 215 being connected in parallel to each of these cables.
  • the card 240 is itself connected to computer means such as microcomputers or microprocessors 250 with which an operator can communicate thanks to a screen 270 and a keyboard 260.
  • the computer means 250 are then connected to as many pre-amplification and interface cards 240 as there are inkwells, each card 240 controlling a series of relative actuator modules to the series of blades making up the scraper blade 169 of one of the inkwells.
  • FIG. 2 A first embodiment of the scraper blade and its associated equipment is illustrated seen in cross section in FIG. 2 and in top view in FIG. 3.
  • identical references are used to describe the same parts.
  • the inkwell 100 is formed on the right by the oblique bottom 110, in front and behind by two walls not shown that closes on the left the inkwell roller 105.
  • a series of strips 170 constituting a scraper blade 169 parallel to the ink roller 105 limits the opening left between the lower edge of the oblique bottom 110 and the ink roller 105, opening through which the ink driven by the roller 105 is rotated in a clockwise direction. watch.
  • the strips 170 are oriented so that the plane which they define passes through the axis of rotation of the inkwell roller.
  • the frame 120 and the oblique bottom 110 constitute a single piece arranged so that it has a series of equidistant cylindrical housings 125 whose central axes parallel to each other intersect orthogonally the axis of rotation of the ink roller 105.
  • the frame 120 is drilled at the level of each housing 125, along the central axis of three orifices: a first orifice 128 close to the edge, and two tapped orifices 131 and 132. All the housings 125 open on the side of the ink roller on two parallel flat lips: a lower 126 and an upper 127 machined along the edge of the frame 120 and the bottom 110 respectively. The spacing between these lips corresponds to the thickness of the strip 170. These lips lead the strips 170 in their advance or withdrawal movements relative to the roller.
  • each of these housings 125 is inserted the cylindrical front part of a frame 130 whose rear parallelepiped part is offset upwards.
  • This rear part has, in the axis of the front cylindrical part, a circular chamber with an internal diameter greater than the internal diameter of the front part.
  • This rear part also has in its upper section a tapped orifice 183.
  • a second tapped orifice 185 is drilled in the oblique bottom 110 above each of the housings 125.
  • This orifice 185 is simultaneously parallel to the axis of the housing 125 and in the extension of the first port 183.
  • a position screw 180 having two reverse threads of different pitch, one corresponding to that of the port 183, the other smaller corresponding to the thread of the port 185, is engaged simultaneously in these two holes.
  • each turn of the screw 180 makes it possible to move the frame over a very small distance relative to the frame 120 and to the oblique bottom 110, thus facilitating an exact adjustment of its position relative to these latter parts.
  • a locking screw 175 engaged in the orifice 131 makes it possible to block the position of the frame once it has been determined.
  • the actuator module is in the form of a cylindrical block screwed against the rear face of the frame 130 so that the axis of movement 150 of its internal actuator 200 is coincident with the axis of the housing 125 and therefore that of the front part of the frame 130.
  • a cylindrical intermediate piece 160 engaged inside the frame 130 is secured to the axis of movement 150 by means of a screw 172 for tightening its rear crown.
  • This screw can be tightened by means of an access hole 133 drilled in the lower frame 120 at the level of each housing 125 slightly behind and offset with respect to the axis of the housing.
  • This intermediate piece 160 carries at its front end the strip 170 proper tightened by the fixing screw 171 accessible through the hole 128 mentioned above.
  • connection between the strip 170 and the axis of movement 150 is direct and this strip 170 is advanced or withdrawn with the same precision as the movement of the axis 150.
  • FIGS 4 and 5 show a variant of the mounting of the actuator module 140 and the slats 170.
  • identical references are used to describe parts similar to those encountered previously.
  • a series of bolts 179 supplemented with a wedge 178 keeps the oblique bottom 110 at a predetermined distance from the chassis. lower 120, distance slightly greater than the thickness of the strips 170 arranged at this level side by side to form a scraper blade 169.
  • the lower part of the bottom 110 and the upper part of the frame 120 form two lips 126 and 127 for guiding the slats 170 in their movement orthogonal to the roller 105.
  • Each of these slats 170 is actuated from the rear, through an intermediate piece 160, by an actuator 200 internal to the actuator module 140 mounted on a frame 130.
  • the strip 170 is fixed to the intermediate piece 160 by means of a bolt 171.
  • This piece 160 is made integral with the axis 150 of movement of the module 140 by means of the internal clamping piece 111 and the corresponding nut 172.
  • this frame 130 is adjusted by means of a double-threaded screw 180 acting in a threaded hole 183 of the frame and a second hole 185 drilled opposite each strip in the frame 120.
  • a bar 177 tightened on either side by two bolts 175 makes it possible to block this chassis 120 in position after adjustment.
  • this device operates as follows: during an initial implementation of the device or regular maintenance, the operator commands the device by action on the keyboard 260 to establish all the slats 170 in the reference position of the actuator 200. Translated as electrical signals, this command is transferred through the interface 240 to the control card 215 of each actuator module 140. The actuator 200 then actuates the movement axis 150 until the detector 220 locates this reference position. The operator can then modify the position of each module 140 and its frame 130 relative to the chassis 120 or bottom 110 by action on the position adjustment screws 180 so that all the slats 170 are aligned, therefore have the same interstice vis-à-vis the ink roller 105. Once the position of these modules 140 established, they are blocked by the bolt 174. This alignment of the slats 170 can be done visually or by iterative tests leading to the delivery of an absolutely homogeneous film all along the scraper blade 169.
  • the operator can undertake the calibration of the scraper blade 169 as a function of the lateral and longitudinal contrasts of the page to be printed.
  • the operator can directly decide the position of each of the respective slats, which positions are translated in the form of a series of electrical commands transferred to the card interface 240 which organizes the transmission of the latter to each control card 215 in the form of a pulse designating the direction of movement and of several pulses describing the quantity of elementary movements necessary that the actuator 200 must apply to the axis of movement 150.
  • this direction and this number of displacement units are translated into electrical impulses directly activating the actuator 200.
  • the detector 220 verifies that each of these is indeed carried out and if this is not the case, informs the control card 215 thereof for corrective action.
  • the computer means 250 contain a calculation program residing in a part of random access memory or permanent memory making it possible, after description of the page to be printed, to determine the sequence, according to the angular position of the roller d inkwell as read by a sensor disposed at the end of the shaft, the spacings of each of the strips relative to the ink roller.
  • This program can also include, in the calculations, parameters initially entered on the keyboard, such as viscosity of the ink, absorbency of the paper, materials used on the rollers making up the inking system.
  • This device can be the subject of numerous improvements within the framework of this invention.

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
EP89109053A 1988-05-31 1989-05-19 Regelvorrichtung für das Öffnen eines Farbwerks in einer Druckmaschine Withdrawn EP0344546A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH2069/88 1988-05-31
CH2069/88A CH677211A5 (de) 1988-05-31 1988-05-31

Publications (2)

Publication Number Publication Date
EP0344546A2 true EP0344546A2 (de) 1989-12-06
EP0344546A3 EP0344546A3 (de) 1990-02-07

Family

ID=4225170

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89109053A Withdrawn EP0344546A3 (de) 1988-05-31 1989-05-19 Regelvorrichtung für das Öffnen eines Farbwerks in einer Druckmaschine

Country Status (6)

Country Link
US (1) US4986180A (de)
EP (1) EP0344546A3 (de)
JP (1) JPH0270439A (de)
AU (1) AU617469B2 (de)
BR (1) BR8902488A (de)
CH (1) CH677211A5 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0529376A1 (de) * 1991-08-30 1993-03-03 Heidelberger Druckmaschinen Aktiengesellschaft Vorrichtung zum Verstellen der Farbzonenschrauben der Farbkästen in einer Druckmaschine
EP0531675A1 (de) * 1991-09-03 1993-03-17 Heidelberger Druckmaschinen Aktiengesellschaft Verfahren und Vorrichtung zum Verstellen von Farbzonenschrauben in jeweilige Positionen
FR2696682A1 (fr) * 1992-10-08 1994-04-15 Heidelberger Druckmasch Ag Dispositif pour positionner des dispositifs d'entrainement de réglage dans une machine d'impression.
EP0453872B1 (de) * 1990-04-26 1996-01-10 MAN Roland Druckmaschinen AG Farbmesseranordnung
DE10226482A1 (de) * 2002-06-14 2003-12-24 Koenig & Bauer Ag Messpotentiometer zur Positionierung von Stellelementen an Druckmaschinen

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4131679C1 (de) * 1991-09-24 1993-04-08 Man Roland Druckmaschinen Ag, 6050 Offenbach, De
DE19826810A1 (de) * 1998-06-16 1999-12-23 Koenig & Bauer Ag Verfahren und Einrichtung zur Farbzufuhr
US6412412B1 (en) 2000-03-24 2002-07-02 Heidelberger Druckmaschinen Ag Device and method for controlling ink keys

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3730090A (en) * 1971-02-16 1973-05-01 North American Rockwell Adjusting arrangement for ink fountain blade
DE2648098C3 (de) * 1976-10-23 1984-01-05 Heidelberger Druckmaschinen Ag, 6900 Heidelberg Farbkasten für Offset- oder Hochdruckmaschinen
DE2727426B2 (de) * 1977-06-18 1981-04-30 Heidelberger Druckmaschinen Ag, 6900 Heidelberg Vorrichtung zum Steuern der Farbzuführung einer Bogen-Offsetdruckmaschine
DE2923678C2 (de) * 1979-06-12 1982-02-18 Heidelberger Druckmaschinen Ag, 6900 Heidelberg Farbkasten mit einzelnen, jeweils über die gesamte Zonenbreite reichenden Farbdosiereinrichtungen
DE2951653C2 (de) * 1979-12-21 1983-04-14 M.A.N.- Roland Druckmaschinen AG, 6050 Offenbach Vorrichtung zum Dosieren von Farbe auf der Farbkastenwalze eines Farbwerks für Druckmaschinen
JPH0796293B2 (ja) * 1986-12-29 1995-10-18 東芝精機株式会社 印刷機のインク供給量調整装置

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0453872B1 (de) * 1990-04-26 1996-01-10 MAN Roland Druckmaschinen AG Farbmesseranordnung
EP0529376A1 (de) * 1991-08-30 1993-03-03 Heidelberger Druckmaschinen Aktiengesellschaft Vorrichtung zum Verstellen der Farbzonenschrauben der Farbkästen in einer Druckmaschine
EP0531675A1 (de) * 1991-09-03 1993-03-17 Heidelberger Druckmaschinen Aktiengesellschaft Verfahren und Vorrichtung zum Verstellen von Farbzonenschrauben in jeweilige Positionen
FR2696682A1 (fr) * 1992-10-08 1994-04-15 Heidelberger Druckmasch Ag Dispositif pour positionner des dispositifs d'entrainement de réglage dans une machine d'impression.
DE10226482A1 (de) * 2002-06-14 2003-12-24 Koenig & Bauer Ag Messpotentiometer zur Positionierung von Stellelementen an Druckmaschinen

Also Published As

Publication number Publication date
EP0344546A3 (de) 1990-02-07
BR8902488A (pt) 1990-01-16
US4986180A (en) 1991-01-22
CH677211A5 (de) 1991-04-30
JPH0270439A (ja) 1990-03-09
AU3471289A (en) 1989-12-07
AU617469B2 (en) 1991-11-28

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