US3700984A - Dampener control system for lithographic printing press - Google Patents

Dampener control system for lithographic printing press Download PDF

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Publication number
US3700984A
US3700984A US121875A US3700984DA US3700984A US 3700984 A US3700984 A US 3700984A US 121875 A US121875 A US 121875A US 3700984D A US3700984D A US 3700984DA US 3700984 A US3700984 A US 3700984A
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United States
Prior art keywords
speed
linear function
output
printing plate
press
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Expired - Lifetime
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US121875A
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English (en)
Inventor
William H Rouse
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Boeing North American Inc
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North American Rockwell Corp
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/0054—Devices for controlling dampening
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F7/00—Rotary lithographic machines
    • B41F7/20—Details
    • B41F7/24—Damping devices

Definitions

  • the system includes a tachome- 'ter generator for producing an electrical signal representing the press speed, and means-for converting the electrical signal to a mechanical displacement.
  • the mechanical displacement is applied to a resistor matrix which produces a second electrical signal which represents a predetermined nonlinear function of the press speed, with the particular nature of the function being determined by the setting of the resistor matrix.
  • This second electrical signal is supplied to the speed control means associated with the feed motors so as to automatically vary the speed of the feed motors according to the predetermined nonlinear function of the press speed.
  • the present invention relates generally to dampening systems for lithographic printing presses and, more particularly, to an improved dampening system which auby those familiar with this-art, the speed at which the feed motors are operated controls the rate at which ditives used in the art or any equivalent ink-repelling I liquid.
  • the water is applied to specified areas of the plate surface in varying amounts from a form roller made of resilient material and receives water from a feed roller driven by a feed motor. Much time and effort has been expended in the past to regulate the feeding of the water in order to supply the moisture at a desired rate.
  • Yet another object of this invention is to provide such an improved dampening system which can be economically manufactured and installed.
  • FIGS. la and lb form a single schematic diagram of a dampening control system embodying the present invention
  • FIG. 2 is a graphical illustration of one exemplary non-linear function of press speed according to which the water supply rate is varied by the system of FIG. 1;
  • FIG. 3 is a graphical illustration of the biasing effect of the control system of FIG. 1 as applied to the function of FIG. 2;
  • FIG. 4 is a graphical illustration of an adjustment of the slope of the function of FIG. 2, as effected by the control'system of FIG. 1.
  • FIG. 1 the illustrative control system is provided for controlling the speed of a plurality of feed motors 10 which are included as conventional parts of standard dampening system'for lithographic printing presses.
  • a dampening system is described in detail in U.S. Pat. No. 3,411,441, issued Nov. 19, 1968 to C. J. Hermach et al., and assigned to the as signee of the present invention.
  • the dampening water is fed to the printingplate.
  • the automatic control system includes first generating means for producing a first control signal representing the press speed, second generating means responsive to the first signal for producing a second control signal representing a predetermined non-linear function of the press speed, and control means responsive. to the second control signal for controlling the speed of the feed motors according to the predetermined non-linear function of the pressspeed.
  • a tachometer. generator 11 is driven by the press so as to produce an electrical output signal directlyproportional to the press speed. This output [signal is scaled by a voltage divider comprising resistors 12 and 13, and the scaled output is applied via a potentiometer 14 to the input of a servo amplifier 15.
  • the power input to the amplifier 15 is supplied from a d-c power supply 16.
  • the signal proportional to press speed maybe generated by an auxiliary potentiometer having its wiper driven by the pilot motor in the main controller for the press.
  • the output of the amplifier 15 is applied to a position servo motor 17, the mechanical output of which is fed back to position the wiper of the.potentiometer 14.
  • the amplifier 15 drives the position servo motor 17 until the position feedback signal from the motor output has adjusted the wiper of the potentiometer 14 to a point where the input voltage to the amplifier 15 is zero. At this point, both the output shaft of the position servo motor 17 and the wiper of the potentiometer 14 are displaced from their original positions by distances proportional to the press speed, thereby providing a mechanical output signal proportional to press speed.
  • the mechanical Output signal from the position servo motor 17, which is proportional to press speed, is applied to the input of a resistor matrix which is preset to producean electrical output signal representing a predetermined non-linear function of the mechanical input signal representing press speed. More specifically, the mechanical output from the position servo motor 17 adjusts the wiper of an input potentiometer 18 comprising one part of a resistor matrix 19.
  • This resistor matrix 19 is a conventional component which is commercially available, such as the Vernistat resistor matrix manufactured by Perkin-Elmer Corporation.
  • the resistor matrix 19 can be preset so that it responds to any given mechanical input, applied to the wiper of the input potentiometer 18, to produce an electrical output signal which varies according to the settings of a multiplicity of cross bar connectors 20 which connect the input potentiometer 18 to an output potentiometer 21.
  • the adjustable cross bar connectors 20 connect a multiplicity of vertical bars 20a, which are electrically connected to the input potentiometer 18 at equally spaced intervals, to a corresponding multiplicity of horizontal bars 2012, which are electrically connected to the output potentiometer 21 at equally mechanical input to the wiper of potentiometer 18.
  • the resistor matrix is typically set so that the electrical output signal across leads 22 and 23 varies according to the non-linear function illustrated graphically in FIG. 2, which is a hyperbola within an asymptote initially positive and sloped positively.
  • a manually adjustable control means is operatively connected to the resistor matrix 19 for changing the slope of the function generated by the matrix 19.
  • a potentiometer 19a is connected to one end 'of the output potentiometer 21 for controlling the voltage level across the potentiometer 21.
  • the press operator may change the slope of the function determined by the settings of the cross bar connectors 20 in the matrix 19, e. g., as illustrated graphically in FIG. 4.
  • the electrical output signal on leads 22 and 23 is supplied to the input of an a-c amplifier 24 for the purpose of re-scaling the output signal from the resistor matrix 19 to match that output signal to the following portion of the system.
  • the a-c input to this amplifier 24 is obtained from an a-c power supply 25.
  • the a-c output from the amplifier 24 is rectified by a diode bridge 26 and fed back to the input of the amplifier 24, via a potentiometer 27, a resistor 28 and a capacitor 29 for the purpose of stabilizing the amplifier.
  • the a-c output from the amplifier 24, which of course represents the function generated by the matrix 19, is also applied across the primary winding 30a of a transformerwhich biases the signal to a predetermined level as illustrated in FIG. 3.
  • the purpose of this bias is to provide an operator modification of the signal supplied to the primary windings 31a, 32a, 33a, and 34a of a series of input transformers associated with the four corresponding feed motors 10.
  • the signal from the secondary windings 30b and 30c associated with the primary winding 3011 is applied to modify the signal applied to the aforementioned primary windings 31a, 32a, 33a, and 34a connected in parallel with each other.
  • the press speed control unit 35 In order to automatically increase the signal across the primary windings 31a-34a in response to a change in press speed, the press speed control unit 35, which is a conventional part of most lithographic printing presses, energizes a relay 36 whenever either the faster" contacts 35a or the slower contacts 35b are closed, i.e., whenever the press speed is either increasing or decreasing.
  • the relay 36 When the relay 36 is energized, it
  • the operator may manually adjust the bias effected by the biasing transformer by moving the tap on the secondary coil 30c.
  • the knob for effecting displacement of the adjustable tap on the secondary winding 300 is preferably mounted on the main press control panel so that it is readily accessible to the press operator.
  • the systems for controlling the speed of operation of the feed motors- 10 in response to the signals applied to the primary windings 31a, 32a, 33a, and 34a are conventional and well known in the art and, therefore, need not be described in detail herein. It should suffice to state that the secondary windings 31b, 32b, 33b, and 34b associated with the corresponding primary windings 31a-34a are connected across respective diode bridges 37, 38, 39, and 40, and the resulting rectified signals are applied to corresponding potentiometers 41, 42, 43, and 44. These potentiometers 41-44 may be manually adjusted to control the speed of each individual feed motor 10 according to the amount of water needed for a particular ink or particular web width during any given press run. From the potentiometers 4144, corresponding input signals are supplied to the conventional speed control units 45, 46,
  • the present invention provides an improved lithographic press dampening system which controls the rate of supply of the dampening'water in a completely automatic manner, and more accurately than dampening systems proposed heretofore.
  • This improved dampening system is extremely reliable in operation, and yet can be economically manufactured, installed and maintained.
  • control means comprising:
  • first. means operationally coupled to said variable speed rotary printing plate and developing a first means output that is a linear function of the speed of said rotary printing plate;
  • said second means output is an electrical signal having a voltage which varies according to said non-linear funcbeing varied to change the rate at which said hyperbola-like function approaches an asymptote with. in-' creased rotary printing plate speed and increased feed motor means speed.
  • said second means output is an electrical signal having a voltage which varies according to said non-linear function
  • said second means comprising a first resistor means developing avoltage that varies according to said non-linear function and a second means that develops a bias voltage that is combined with said first resistor means voltage.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Rotary Presses (AREA)
US121875A 1971-03-08 1971-03-08 Dampener control system for lithographic printing press Expired - Lifetime US3700984A (en)

Applications Claiming Priority (1)

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US12187571A 1971-03-08 1971-03-08

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US3700984A true US3700984A (en) 1972-10-24

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US121875A Expired - Lifetime US3700984A (en) 1971-03-08 1971-03-08 Dampener control system for lithographic printing press

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US (1) US3700984A (enrdf_load_stackoverflow)
JP (1) JPS56540U (enrdf_load_stackoverflow)
CA (1) CA949166A (enrdf_load_stackoverflow)
CH (1) CH543396A (enrdf_load_stackoverflow)
DE (1) DE2206497C2 (enrdf_load_stackoverflow)
FR (1) FR2129437A5 (enrdf_load_stackoverflow)
GB (1) GB1363561A (enrdf_load_stackoverflow)
IT (1) IT949661B (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5520113A (en) * 1989-03-09 1996-05-28 Heidelberger Druckmaschinen Ag Method of regulating dampening medium
US6138563A (en) * 1997-10-22 2000-10-31 Baldwin-Japan, Ltd. Dampening water feeding method and apparatus

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0022191A1 (de) * 1979-07-05 1981-01-14 Automation für grafische Technik A.G. Druckmaschine, insbesondere Offset-Druckmaschine
DD157856A3 (de) * 1980-07-25 1982-12-15 Beyer Wolfgang Einstellbares nichtlineares korrekturglied fuer eine steuereinrichtung von antrieben an druckmaschinen
DD216199B1 (de) * 1983-06-23 1989-07-26 Planeta Veb Druckmasch Werke Verfahren und stelleinrichtung zur feuchtmittelfuehrung
FR2610399B1 (fr) * 1987-02-03 1991-04-12 Marinoni Harris Sa Procede de mesure de l'epaisseur d'un film d'une solution de mouillage depose sur une plaque d'impression d'une rotative offset et systeme pour la mise en oeuvre de ce procede
DE3828182A1 (de) * 1988-08-19 1990-02-22 Giebeler Gmbh & Co Kg Robert Verfahren zur einstellung der feuchte bei einer rollen-nassoffset-druckmaschine
DD275011A1 (de) * 1988-08-23 1990-01-10 Polygraph Leipzig Verfahren und vorrichtung zur feuchtmitteldosierung
DE3907584A1 (de) * 1989-03-09 1990-09-13 Heidelberger Druckmasch Ag Verfahren zur feuchteregelung bei einer offsetdruckmaschine
DE19701219A1 (de) * 1997-01-16 1998-07-23 Heidelberger Druckmasch Ag Verfahren zur Steuerung der Farbgebung beim Drucken

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB715149A (en) * 1952-02-01 1954-09-08 English Electric Co Ltd Improvements relating to control systems for direct current motors
US3411441A (en) * 1966-06-24 1968-11-19 Miehle Gross Dexter Inc Brush-type moistening mechanism

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3191528A (en) * 1963-02-21 1965-06-29 Graphic Arts Technical Foundat Automatic dampener control for a rotary lithographic press
DE1292902B (de) * 1965-06-23 1969-04-17 Licentia Gmbh Einrichtung zur digitalen Lageregelung
US3433155A (en) * 1965-09-13 1969-03-18 Harris Intertype Corp Mechanism for applying a coating to a plate
FR1531541A (fr) * 1967-05-22 1968-07-05 Etudes De Machines Speciales Dispositif de mouillage notamment pour une imprimeuse rotative du type offset
FR93677E (fr) * 1967-05-22 1969-05-02 Etudes De Machines Speciales Dispositif de mouillage, notamment pour une imprimeuse rotative du type offset.
DE1611313B1 (de) * 1967-11-20 1970-12-23 Lau Wolf Feuchtwerk fuer eine Offsetdruckmaschine
DE1904178A1 (de) * 1969-01-29 1970-08-06 Schluckebier Wilhelm Verfahren und Einrichtung zum Feuchten von Druckplatten einer Offsetdruckmaschine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB715149A (en) * 1952-02-01 1954-09-08 English Electric Co Ltd Improvements relating to control systems for direct current motors
US3411441A (en) * 1966-06-24 1968-11-19 Miehle Gross Dexter Inc Brush-type moistening mechanism

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5520113A (en) * 1989-03-09 1996-05-28 Heidelberger Druckmaschinen Ag Method of regulating dampening medium
US6138563A (en) * 1997-10-22 2000-10-31 Baldwin-Japan, Ltd. Dampening water feeding method and apparatus

Also Published As

Publication number Publication date
CH543396A (de) 1973-10-31
DE2206497C2 (de) 1983-01-05
CA949166A (en) 1974-06-11
DE2206497A1 (de) 1972-09-21
GB1363561A (en) 1974-08-14
FR2129437A5 (enrdf_load_stackoverflow) 1972-10-27
IT949661B (it) 1973-06-11
JPS56540U (enrdf_load_stackoverflow) 1981-01-06

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