US3853409A - Method of and apparatus for giving information on the ink requirements of a printing forme - Google Patents

Method of and apparatus for giving information on the ink requirements of a printing forme Download PDF

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Publication number
US3853409A
US3853409A US00271555A US27155572A US3853409A US 3853409 A US3853409 A US 3853409A US 00271555 A US00271555 A US 00271555A US 27155572 A US27155572 A US 27155572A US 3853409 A US3853409 A US 3853409A
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United States
Prior art keywords
image
image member
light
column
area
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Expired - Lifetime
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US00271555A
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English (en)
Inventor
J Gaillochet
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MARINONI
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MARINONI
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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
    • B41F33/0027—Devices for scanning originals, printing formes or the like for determining or presetting the ink supply

Definitions

  • ABSTRACT The present invention relates to a method which enables information to be given on the ink requirements of a printing forme, this method consisting of analyzing, in the flat state and at one pass, by light measurements, all the columns of the photo-engraving film of the printing forme, each in the aggregate, and then recording the information obtained.
  • the invention also relates to a device for carrying this method into effect, which device comprises a single photoelectric cell of large size for each column to be analyzed, and a recording device for the information obtained.
  • the present invention has'for its object a method and a device which make it possible to give information on the ink requirements of a printing forme, which information will subsequently be utilized to regulate the feed of ink per column from the inking troughs of printing sets. (By-the word column there will be understood the virtual division'into columns which is generally considered as a printing forme).
  • the typograph and offset methods of printing utilize, in order to regulate the quantity of ink in each column, a deformable metal blade which comes in proximity to an inking roller dipping in the ink, and thus limits at each point of a generator line of the roller, the thickness of the film of ink sent to the printing forme.
  • the deformable blade is generally applied against the roller by a large number of screws or other regulating means (one per column or even more) which define at this point the space between the inking roller and the blade. Sometimes also each column is supplied with ink by a piston pump having a variable travel.
  • the adjustment of the screws is generally carried out manually by operators who watch the printed paper in order to determine in which columns there is too much or not enough ink, and who vary the positions of the screws in consequence.
  • a preliminary adjustment may be made by observing on the printing forme vertically above each inking screw, the size of the surface to be printed in this column.
  • the present invention relates to a method which enables information to be given on the ink requirements of a printing forme, this method consisting of analyzing, in the flat state and at one pass, all the columns of the photo-engraving film of the printing forme, each in the aggregate, and then recording the information obtained.
  • This invention also relates to a device for carrying this method into effect, which device comprises a single photo-electric cell of large size for each column to be analyzed, and a recording device for the information obtained.
  • FIG. 1 is a diagrammatic exploded view in perspective of a device according to the invention
  • FIG. 2 is a view in cross-section to a larger scale of the assembly permitting the analysis of the photoengraving film
  • FIG. 3 shows the block diagram of a possible example of the recording of the information on a perforated strip.
  • the method which enables information to be given on the requirements in ink of a printing forme consists of the analysis by densitometry in the flat position and at a single pass, of all the'columns of a typon or photo-engraving film of the printing forme.
  • the film is either a positive or a negative" of the image to be obtained on paper.
  • the surface to be printed is either directly proportional to the black of the film (the case of the positive film) or to the white (in the case of the negative film). The proportions supplied by the analysis must be corrected correspondingly.
  • the film is analyzed, preferably suspended in a vertical plane, without any part being in movement. It is converted to a suitable document in the photoengraving laboratory itself. By this means, any loss, damage or degradation is avoided which would be possible if the film had to be conveyed to the proximity of the printing press. Only the documents coming from the analysis will be conveyed to the printing press.
  • the device according to the invention comprises a lightbox 1 designed so as to provide an illumination which is as uniform as possible on a ground-glass screen 2.
  • This light-box contains fluorescent tubes 3 or any other appropriate lighting device.
  • the typon or film document to be analyzed 4 is placed like a sandwich between the light-box and a battery 5 of photo-electric cells.
  • the document is thus in direct contact with the photo-electric cells while its other face is in contact with the ground-glass screen.
  • the photo-electric cells 5 are equal in number to the number of columns of the printing forme.
  • a scanning recorder a cathode-ray tube 8 for example, on which the voltages coming from the cells 5 are switched cyclically during the horizontal scanning.
  • the type of cell utilized should have a response proportional to the illumination, or that the amplification circuit has a response curve adapted.
  • the film 4 is shown between the diffusing ground-glass screen 2 and a glass 9 for protecting the cells 5, the film being suspended from two marker pins 10 (see also FIG. 1).
  • the panel of cells is fixed on an insulating support 11 and a plate of foam rubber 12 is placed between the insulating support 11 and a closure plate 13 of the light-box.
  • the device is used in the following manner:
  • the gain of the amplifiers is adjusted so as to be identically the same in all the amplifying systems.
  • the value 100 is defined as being the position of the spots. on the cathode-ray tube when an entirely opaque film is placed in the device.
  • each spot is deflected in proportion to the surface to be printed which is found in the column considered. It is then possible to take on the cathode-ray tube an extract by hand of the curve of the surfaces to be printed per column. The screen of the tube may also be photographed.
  • the invention provides other means of recording and transmission of information, by perforated tape, magnetic tape or any other appropriate information support.
  • the invention permits the recording of the information on a perforated strip or a magnetic tape. It comprises:
  • a change-over switching unit 14 making it possible to deliver successively and in sequence one of the voltages supplied by the cells
  • An analogue digital interface 15 produces from the voltage supplied at each instant from a cell that is being considered, digital information suitable for actuating a strip perforating device or a magnetic tape;
  • a strip perforating device 16 or a magnetic recorder converting the voltages to coded signs
  • a keyboard 17 permitting the operator to indicate on the perforated strip the reference of the inking trough for which the information is intended;
  • a ring counter 18 the forward movement of which is determined by the signal 19 signifying the end of recording of each information, this signal being produced by the strip perforating device or by the tape recorder.
  • the operator types the code number of the inking trough for which the information is intended.
  • This code number is recorded on the perforated strip, and the ring counter 18 is set at the zero position (signal As soon as the code number is recorded, the ring counter passes into the position 1 and causes the opening of the channel 1 of the switching unit 14, thus permitting the passage of the voltage coming from the cell 1 towards the strip perforating device.
  • a signal 19 of the end of recording opens the passage to the channel 2 and effects the perforation of the signals coming from the cell 2 and so on until all the cells are exhausted.
  • the device stops and signals to the operator that the cycle is completed. The operator may then cut the strip and send it to the press for use. He may also carry out theanalysis of another film and the recording of the information given by this analysis.
  • Apparatus for determining a plurality of settings which control the amount of ink applied to respective circumferential columns of a printing forme used to effect the printing of an image comprising means for sup porting an image member having an image thereon corresponding to the image to be printed from said forme, the image on said image member having column areas corresponding to said columns on the forme, a photosensitive area disposed to receive light from said image member with said photosensitive area being large enough to receive the light at one time from the entire area of a plurality of the column areas of the image on the image member, means for directing light onto the whole of a plurality of column areas on said image member, to transmit light to the photosensitive area and to establish over corresponding column areas of the photosensitive area a light intensity which indicates the image density in the corresponding column area of the image member and means for deriving from each of said photosensitive column areas a respective electrical signal depending on the amount of light on the column area.
  • said photosensitive area comprises a plurality of photoelectric cells each of a size to receive light corresponding to a respective column area
  • said means for deriving a respective electrical signal from each of said photosensitive column areas comprises means for deriving a respective electrical signal from each corresponding respective one of said photoelectric cells.
  • each of said photoelectric cells comprises a selenium cell with a stop layer.
  • Apparatus as defined in claim 3 and wherein said means for directing light onto said image member comprises a source of light providing a substantially uniformly diffused illumination of said image member and wherein said image member comprises a film.
  • a method of providing information regarding requirements of ink for a printing forme comprising directing light ontoan image member having the image to be printed thereon to illuminate the entire image area, transmitting light from the image member which varies spatially in intensity in accordance with thedensity of the image to be printed and illuminating there forme.

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  • Manufacture Or Reproduction Of Printing Formes (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Printing Methods (AREA)
US00271555A 1971-08-04 1972-07-13 Method of and apparatus for giving information on the ink requirements of a printing forme Expired - Lifetime US3853409A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7128656A FR2148820A5 (enExample) 1971-08-04 1971-08-04

Publications (1)

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US3853409A true US3853409A (en) 1974-12-10

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US00271555A Expired - Lifetime US3853409A (en) 1971-08-04 1972-07-13 Method of and apparatus for giving information on the ink requirements of a printing forme

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US (1) US3853409A (enExample)
DE (1) DE2229500C3 (enExample)
FR (1) FR2148820A5 (enExample)
GB (1) GB1407503A (enExample)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3958509A (en) * 1974-06-13 1976-05-25 Harris Corporation Image scan and ink control system
US4180741A (en) * 1978-06-07 1979-12-25 Harris Corporation Apparatus for determining image areas for printing with calibration
US4187435A (en) * 1978-06-07 1980-02-05 Harris Corporation Apparatus for determining image areas for printing with correction for extraneous matter
US4210818A (en) * 1978-06-07 1980-07-01 Harris Corporation Apparatus for determining image areas for printing
US4512662A (en) * 1981-07-06 1985-04-23 Tobias Philip E Plate scanner for printing plates
US4555180A (en) * 1982-04-03 1985-11-26 Dainippon Screen Mfg. Co., Ltd. Printed area measuring apparatus
US4573798A (en) * 1981-09-16 1986-03-04 Toshiba Kikai Kabushiki Kaisha Method and apparatus for measuring pattern area percentage for engraving films
US4678336A (en) * 1984-09-28 1987-07-07 Komori Printing Machinery Co., Ltd. Apparatus for detecting image area of thin plate
US4864930A (en) * 1985-05-09 1989-09-12 Graphics Microsystems, Inc. Ink control system
US5052298A (en) * 1985-05-09 1991-10-01 Graphics Microsystems Ink control system

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE375726B (enExample) * 1972-11-07 1975-04-28 Tolerans Ab
DE2728738B2 (de) * 1977-06-25 1979-05-10 Roland Offsetmaschinenfabrik Faber & Schleicher Ag, 6050 Offenbach Eulrichtung zur Kontrolle und Regelung der Farbgebung an Druckmaschinen
GB2024457B (en) * 1978-06-07 1983-01-06 Harris Corp Printing press ready and control system
DE2950650A1 (de) * 1979-12-15 1981-06-19 M.A.N.- Roland Druckmaschinen AG, 6050 Offenbach Vorrichtung zur opto- elektronischen messung der flaechendeckung einer offset-druckplatte oder einer der offset-druckplattenherstellung dienenden druckvorlage
DE3204501C1 (de) * 1982-02-10 1983-10-27 M.A.N.- Roland Druckmaschinen AG, 6050 Offenbach Vorrichtung zur Regelung der Farbzufuehrung in einer Rotationsdruckmaschine
DE3334019A1 (de) * 1983-09-21 1985-03-28 Albert-Frankenthal Ag, 6710 Frankenthal Verfahren und vorrichtung zur einstellung der den farbzonen eines farbwerks zugeordneten dosierorgane

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2140799A (en) * 1935-03-28 1938-12-20 Andrew A Kucher Multiple light sensitive tube
US3535046A (en) * 1966-12-06 1970-10-20 Howson Ltd W H Ink density measuring apparatus

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2140799A (en) * 1935-03-28 1938-12-20 Andrew A Kucher Multiple light sensitive tube
US3535046A (en) * 1966-12-06 1970-10-20 Howson Ltd W H Ink density measuring apparatus

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3958509A (en) * 1974-06-13 1976-05-25 Harris Corporation Image scan and ink control system
US4180741A (en) * 1978-06-07 1979-12-25 Harris Corporation Apparatus for determining image areas for printing with calibration
US4187435A (en) * 1978-06-07 1980-02-05 Harris Corporation Apparatus for determining image areas for printing with correction for extraneous matter
US4210818A (en) * 1978-06-07 1980-07-01 Harris Corporation Apparatus for determining image areas for printing
US4512662A (en) * 1981-07-06 1985-04-23 Tobias Philip E Plate scanner for printing plates
US4573798A (en) * 1981-09-16 1986-03-04 Toshiba Kikai Kabushiki Kaisha Method and apparatus for measuring pattern area percentage for engraving films
US4555180A (en) * 1982-04-03 1985-11-26 Dainippon Screen Mfg. Co., Ltd. Printed area measuring apparatus
US4678336A (en) * 1984-09-28 1987-07-07 Komori Printing Machinery Co., Ltd. Apparatus for detecting image area of thin plate
US4864930A (en) * 1985-05-09 1989-09-12 Graphics Microsystems, Inc. Ink control system
US5052298A (en) * 1985-05-09 1991-10-01 Graphics Microsystems Ink control system

Also Published As

Publication number Publication date
FR2148820A5 (enExample) 1973-03-23
DE2229500A1 (de) 1973-03-01
GB1407503A (en) 1975-09-24
DE2229500B2 (de) 1975-11-20
DE2229500C3 (de) 1980-05-08

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