US3771868A - Method for preparing and checking a photographic cut which is to be transferred to a sensitized printing cylinder, and means for applying this process - Google Patents

Method for preparing and checking a photographic cut which is to be transferred to a sensitized printing cylinder, and means for applying this process Download PDF

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Publication number
US3771868A
US3771868A US00138238A US3771868DA US3771868A US 3771868 A US3771868 A US 3771868A US 00138238 A US00138238 A US 00138238A US 3771868D A US3771868D A US 3771868DA US 3771868 A US3771868 A US 3771868A
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Prior art keywords
cut
glass
frame
projectors
slides
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Expired - Lifetime
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US00138238A
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English (en)
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R Bassereau
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Individual
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Individual
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F9/00—Registration or positioning of originals, masks, frames, photographic sheets or textured or patterned surfaces, e.g. automatically

Definitions

  • a heliogravure cylinder can be checked only in the final stage of its fabrication, i.e. during the first tests, and the defects which quite often appear are such that they cause the rejection of the said cylinder, these defects being those principally resulting in a discontinuity in the impression.
  • the discontinuity appears in three different ways for 'every rotation of the cylinder:
  • the causes of these defects are due, principally, either to the cut or to the machine transferring them onto the cylinder.
  • the cut appears in the form of a rectangular, more or less transparent image whose height is equal to the evolution of the cylinder, and has a wide, fully transparent border.
  • the transition between the upper and lower borders of the cut and its transparent surrounding portion is never sharp, and the two borders are never strictly parallel, hence it is necessary to position two masks in order to remedy these drawbacks.
  • the two masks in turn, are strictly parallel.
  • the cut can be slightly trapezoidal, and in this case a part of the pattern is masked by one of the masks. and, during the transfer to the cylinder, the register is defective.
  • the preparation and checking process which is the object of the present invention, consists in projecting simultaneously, on a screen, with the aid of two twinned projectors disposed in a plane perpendicular to the cut, a pointon the upper edge and a corresponding point on the lower edge of said cut, in merging the images of these two points, and moving the two projectors parallel to the cut in such a way as to project, successively, all points on the upper and lower edges of the cut.
  • the total image comprising the images of the surrounding points, is the reproduction on a large scale of the critical zone of the cylinder, i.e. the zone where discontinuities appear if the cut is defective.
  • FIGS. 1 and 2 are very diagrammatic views in perspective illustrating the essential phases of the method of preparation and checking of the cut
  • FIG. 3 is a perspective view of a device for applying this method
  • FIG. 4 is an enlarged view in vertical section of said device
  • FIG. 5 is a section taken along line VV of FIG. 4, limited to the support of the lower projector, and
  • FIG. 6 is a partial exploded view in perspective of the lower device for merging the images of a point on the upper edge of the cut with those of the corresponding point on the lower edge. 7
  • the cut 1 a conventional one, presumed to be rectangular, and delimited by its apexes ABCD, is provided with a transparent border 2, and is applied against a surface, likewise transparent, constituted by a transparent glass 3.
  • a point B on side AB is projected on a screen 6 with the aid of a projector symbolized by its light source 7 and its lens 8, the said projector being displaceable along a straight path parallel to cut 1.
  • every image of some other point on edge AB will be matched by an image of some other point on side DC which will coincide with the said first image.
  • masks 11 and 12 presents no difficulty if the cut is perfect, and the procedure is exactly the same, i.e. edge 11' of the mask 11 is merged with side AB of the cut, and edge 12' of mask 12 with side DC, if we check on the screen, by displacement of the projectors, that the images of the lines formed by the edges 11' and 12 of the masks have merged.
  • edges 11 and 12 of the masks delimit the cut, it can be useful to materialize their prolongation on the transparent surrounding of the cut so as to dispose reference marks which allow high precision of later positioning of the said cut, with respect to the cylinder to be isolated.
  • An operator can, of course, start the operation again for the other side of the cut.
  • glass 3 is held at the top and bottorn by two crosspieces 15 whose ends extend into openings 16 in the vertical sides of a frame 17 which can be held in a substantially vertical plane.
  • the lower side 17 of frame 17 has, at each end, an adjustable screw 18 for changing the inclination of crosspieces 15 with respect to the sides of the frame for reasons which will appear hereinafter.
  • a sleeve 19 can slide on each of the sides, upper side 17" and lower side 17, of the frame 17, a sleeve 19 can slide.
  • Sleeves 19 are joined by two crossbraces 20, disposed perpendicularly to the upper and lower sides of frame 17.
  • Crossbraces 20 insure the guidance of identical slides 21 and 22, each of which can be immobilized by means of a screw 23.
  • Slides 21 and 22 are made integral with one end of support arms 24 and 25, respectively, and which arms are in the form of a U, the branches of which extend on either side of glass 3.
  • the middle part of support 24 lies above the upper edge 17" of frame 17, while that of support 25 lies below the lower edge 17' of the said frame.
  • the lens 8 of the projector is fixed at the end of the branch of support 24 extending between the glass and the screen, while lens 10 is fixed on the corresponding branch of support 25.
  • the ends'of the other branches of supports 24 and 25 are made integral, respectively, with platens 26 and 27, on each of which is fixed, respectively, the lighting device of each of the projectors.
  • Platens 26 and 27 are connected, respectively, to slides 21 and 22 by means of axis 28 which allows them to pivot.
  • each slide has a threaded pin on which is mounted a spring 30, extending beyond an opening 31 in a tab 32 of the corre sponding platen, and receiving a nut 33.
  • Springs 30 tend to pivot the supports so that the axes of lenses 8 and 10 converge, but, by acting on nuts 33, it is possible to vary this convergence so that the images projected on the screen will merge as described above.
  • This device works as follows: the cut is fixed on glass 3 by means for example, of adhesive tongues, then a projector is turned on, the upper one, for example, and the mobile apparatus is displaced so as to verify that the edge AB of the cut is parallel to the horizontal sides of the frame; the parallelism can optionally be rectified by acting on either of screws 18.
  • the present invention is not, of course, limited to the method of embodiment described and represented; on the contrary it extends to all variants of form, material and size.
  • the fixation of the cut against the glass can be improved by aspirating the center of the latter through orifices in the said glass.
  • a method for preparing and checking a photographic cut with a transparent border designed to be transferred to a printing cylinder, consisting in, simultaneously projecting on a screen, with the aid of two similar projectors, a point on the upper edge of the cut and the corresponding point on the lower edge of the cut, causing the images of these two projected points to coincide on said screen, displacing said two projectors parallel to the cut to project, successively, all points on the upper and lower edges of the cut, manually retouching the cut to correct the same and thus the total image obtained on the screen of the out if the image shows discontinuities, next fixing masks along the lower and upper edges of the cut so that the images on the screen of the edges of the masks will be merged, manually retouching the cut to correct the total image when said image again shows discontinuities, providing lines on said transparent border surrounding the out which are the prolongations of the edges of the masks, and
  • a device for preparing and checking a photographic cut designed to be transferred to a printing cylinder comprising, in combination, a glass on which the cut to be checked and prepared can be detachably mounted, a frame supporting said glass vertically and having at least two parallel sides, connected slides slideably mounted on said two parallel sides of said frame, a pair of projectors each adjustably connected to one of said slides, means carried by-said slides for adjusting the position of said projectors relative to said glass and means on said frame for adjusting the position of said glass thereon.
  • said slides includes sleeves each slideable mounted on a different one of said two parallel sides of the frame, at least one cross-brace, disposed perpendicular to said frame sides and connecting said sleeves and two slides slideably mounted on said cross-brace, and each slide supporting a light source of one of said projectors on one side of said glass, and a lens of one of said projectors on the other side of said glass.
  • said slides also includes U-shaped pieces each integral with a corresponding one of said sleeves, the branches of said U-shaped piece extending on both sides of said glass and supporting one of said light sources on one side of said glass, and one of said lens on the other side of said glass.
  • said projector adjusting means includes platens each integral 7 with the corresponding end of one of said U-shaped pieces on which a projector is mounted, and means to articulate said platens along an axis parallel to the direction of displacement of said slides.
  • a device including a threaded pin on each slide, a spring on each pin, a tab on each platen, said tab having an oblong opening with said pin extending therethrough, and an adjusting nut on said pin for compressing said spring and vary the inclination of said platen.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Projection Apparatus (AREA)
  • Exposure And Positioning Against Photoresist Photosensitive Materials (AREA)
  • Projection-Type Copiers In General (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
US00138238A 1970-04-30 1971-04-28 Method for preparing and checking a photographic cut which is to be transferred to a sensitized printing cylinder, and means for applying this process Expired - Lifetime US3771868A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7015942A FR2046588A5 (enExample) 1970-04-30 1970-04-30

Publications (1)

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US3771868A true US3771868A (en) 1973-11-13

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US00138238A Expired - Lifetime US3771868A (en) 1970-04-30 1971-04-28 Method for preparing and checking a photographic cut which is to be transferred to a sensitized printing cylinder, and means for applying this process

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Country Link
US (1) US3771868A (enExample)
DE (1) DE2121502A1 (enExample)
FR (1) FR2046588A5 (enExample)
GB (1) GB1316210A (enExample)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4007988A (en) * 1973-05-03 1977-02-15 Nippon Kogaku K.K. Manufacture of multi-layer structures
US4050817A (en) * 1973-05-03 1977-09-27 Nippon Kogaku K.K. Manufacture of multi-layer structures
USD308588S (en) 1987-08-31 1990-06-12 Alco Industries, Inc. Pet carrier

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2825142A (en) * 1956-06-29 1958-03-04 Henry G Johnson Image registering apparatus for photocomposing machines

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2825142A (en) * 1956-06-29 1958-03-04 Henry G Johnson Image registering apparatus for photocomposing machines

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4007988A (en) * 1973-05-03 1977-02-15 Nippon Kogaku K.K. Manufacture of multi-layer structures
US4050817A (en) * 1973-05-03 1977-09-27 Nippon Kogaku K.K. Manufacture of multi-layer structures
USD308588S (en) 1987-08-31 1990-06-12 Alco Industries, Inc. Pet carrier

Also Published As

Publication number Publication date
FR2046588A5 (enExample) 1971-03-05
GB1316210A (en) 1973-05-09
DE2121502A1 (de) 1971-11-18

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