US3729584A - Apparatus for the preparation of screen printing forms with an adjustable relation between grey values of the pattern and grey values of the printing forms - Google Patents

Apparatus for the preparation of screen printing forms with an adjustable relation between grey values of the pattern and grey values of the printing forms Download PDF

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Publication number
US3729584A
US3729584A US00135732A US3729584DA US3729584A US 3729584 A US3729584 A US 3729584A US 00135732 A US00135732 A US 00135732A US 3729584D A US3729584D A US 3729584DA US 3729584 A US3729584 A US 3729584A
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United States
Prior art keywords
pattern
contrast
output
scanning
engraving
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Expired - Lifetime
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US00135732A
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English (en)
Inventor
Vos F De
J Steege
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Werkspoor Amsterdam NV
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Werkspoor Amsterdam NV
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Publication date
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Publication of US3729584A publication Critical patent/US3729584A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/40—Picture signal circuits
    • H04N1/40025—Circuits exciting or modulating particular heads for reproducing continuous tone value scales

Definitions

  • An engraving device includes a plurality of input terminals which control its cutting movement, and these input terminals are connected to the digital output terminals at a two-coordinate pin board so that the contrast of a pattern being scanned may be altered at will at the printing form being engraved.
  • the invention relates to a method for preparing screen printing formes to a given pattern by means of an electro-magnetically controlled engraving member;
  • the invention achieves the afore-mentioned aims by the fact, that for the actuation of the engraving member, each of the discrete signals delivered by the converter circuit can be fed to each of the circuits controlling the engraving member.
  • This adjustability means that the method can be used to achieve any required contrast; to suppress measured grey values of the motif; or to combine a number of grey values for one resulting cutting movement of the engraving member.
  • a printing form clamped on a cylinder 1 is processed by an engraving member 2 controlled by a circuit 3.
  • the control signals for the circuit 3 are delivered by an analog-digital converter 4 which converts the analog signal delivered by a photo-electric scanning member 5 into a number of discrete values distributed over the whole range from white to black.
  • the scanning member 5 scans a pattern disposed on a cylinder 6.
  • the control circuit 3 consists of a number of individual circuits, the amplification of one circuit resulting in a predetermined corresponding cutting movement of the engraving member 2. The total number of possible cutting movements of the engraving member covers the whole range from white to black.
  • each output of the converter 4 By connecting a two-coordinate pin board 7 between the control circuit 3 and the converter 4, each output of the converter 4, only one of which is amplified at every instant, can be connected to an input of the circuit 3, so that a required cutting movement of the engraving member can be made to correspond to a predetermined grey value at choice.
  • a number of outputs of the converter 4 can be connected to one input of the circuit 3, or certain outputs need not be connected.
  • the user of the apparatus has therefore complete freedom on the basis of his own experience to select the programme which he requires for a particular pattern and/or a particular material to be printed.
  • the two coordinate pin board 7 is simply a connector board by means of which any input conductor for the control circuit 3 may be connected to any one, or more, of the output conductors of the converter 4.
  • any input conductor for the control circuit 3 may be connected to any one, or more, of the output conductors of the converter 4.
  • both the 2nd and nth output conductors of the converter 4 are connected to the 2nd input conductor of the control circuit 3, and the 1st output conductor of the converter is connected to the nth input conductor of the control circuit. It will be understood, of course, that other connections would also be made, but not all of the input conductors of the control circuit 3 would necessarily be connected to any output conductor of the converter 4.
  • the main objective is to be able to so connect the output and input conductors so that any desired program may be achieved which will allow the engraved pattern to display a variation of contrast within its motif which may be independent of and specifically different from the variation in contrast within the motif of the original pattern being scanned.
  • the analog-to-digital converter 4 may take any conventional form as for example as is described in the Koll et al. U.S. Pat. No. 3,272,918 and advantageously may be so constructed as to provide 32 discrete brightness steps between the darkest black and the brightest white as is described as conventional in the aforesaid Koll patent.
  • the conductors 1, 2, 3 n in the drawing leading from the converter 4 correspond to the conductors 6 in FIG. 1 of the K01] et al patent.
  • the digital-analog converting mechanism 3 of the present invention may also take any conventional form as is also disclosed by the aforesaid Koll et al patent. And, thus, the conductors 1, 2, 3 n leading to the circuitry 3 in the present drawing correspond to the conductors in FIG. 1 of the K01] et al. patent.
  • Apparatus for preparing screen printing forms comprising, in combination,
  • scanning means for progressively scanning an original pattern which displays a specific variation in contrast within its motif and said scanning means having a plurality of output terminals individually and selectively energized according to the localized intensity of the original pattern
  • engraving means having a plurality of individually and selectively energized input terminals for producing a final pattern of varying local intensity on a screen printing form
  • control means selectively connecting said output terminals of the scanning means to said input terminals of the engraving means for controlling the local intensity of the final pattern produced by said engraving means independently of the local intensity of the corresponding portion of said original pattern to produce a final pattern which may display a variation in contrast specifically different from and independent of said specific variation in contrast of said original pattern.
  • control means comprises a two-coordinate pin board.
  • Apparatus for preparing screen printing forms comprising, in combination,
  • scanning means for progressively scanning an original pattern which displays a specific variation in contrast within its motif and said scanning means having a plurality of output terminals individually and selectively energized according to the localized intensity of the original pattern
  • engraving means having a plurality of individually and selectively energized input terminals for producing a final pattern of varying local intensity on a screen printing form
  • control means selectively connecting said output terminals of the scanning means to said input terminals of the eqgraving means for controlling the local intensity 0 he final pattern produced by said engraving means independently of the'local intensity of the corresponding portion of said original 7 pattern to produce a final pattern which may display a variation in contrast specifically different from and independent of said specific variation in contrast of said original pattern.
  • said scanning means comprises a photosensitive device having an analog output signal whose amplitude is proportional to the localized intensity of the original pattern, and an analog-to-digital converter having said plurality of output terminals, discrete ones of which are energized according to the amplitude of said analog output signal.
  • control means consists of connector means for connecting said output terminals of the converter to said input terminals according to any selected program.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
US00135732A 1967-12-01 1971-04-20 Apparatus for the preparation of screen printing forms with an adjustable relation between grey values of the pattern and grey values of the printing forms Expired - Lifetime US3729584A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL6716368A NL6716368A (fr) 1967-12-01 1967-12-01

Publications (1)

Publication Number Publication Date
US3729584A true US3729584A (en) 1973-04-24

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
US00135732A Expired - Lifetime US3729584A (en) 1967-12-01 1971-04-20 Apparatus for the preparation of screen printing forms with an adjustable relation between grey values of the pattern and grey values of the printing forms

Country Status (3)

Country Link
US (1) US3729584A (fr)
DE (1) DE1811195A1 (fr)
NL (1) NL6716368A (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3876824A (en) * 1973-02-01 1975-04-08 Eastman Kodak Co Density measuring apparatus
US4007362A (en) * 1974-06-26 1977-02-08 Gruner & Jajr Ag & Co. Method of information processing for the production of a printing form and a system for performing said method
US4075658A (en) * 1975-04-29 1978-02-21 Commissariat A L'energie Atomique Method and device for isolating figures in an image
US4402015A (en) * 1980-01-21 1983-08-30 Dainippon Screen Seizo Kabushiki Kaisha Picture signal pre-processing method for a picture reproducing machine
US4533958A (en) * 1982-08-10 1985-08-06 Siemens Aktiengesellschaft Method of transmitting serial data between facsimile equipment and interface performing the same

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3027548A (en) * 1956-12-17 1962-03-27 Bell Telephone Labor Inc Electromagnetic coupling arrangements

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3027548A (en) * 1956-12-17 1962-03-27 Bell Telephone Labor Inc Electromagnetic coupling arrangements

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3876824A (en) * 1973-02-01 1975-04-08 Eastman Kodak Co Density measuring apparatus
US4007362A (en) * 1974-06-26 1977-02-08 Gruner & Jajr Ag & Co. Method of information processing for the production of a printing form and a system for performing said method
US4075658A (en) * 1975-04-29 1978-02-21 Commissariat A L'energie Atomique Method and device for isolating figures in an image
US4402015A (en) * 1980-01-21 1983-08-30 Dainippon Screen Seizo Kabushiki Kaisha Picture signal pre-processing method for a picture reproducing machine
US4533958A (en) * 1982-08-10 1985-08-06 Siemens Aktiengesellschaft Method of transmitting serial data between facsimile equipment and interface performing the same

Also Published As

Publication number Publication date
NL6716368A (fr) 1969-06-03
DE1811195A1 (fr) 1969-07-03

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