US911497A - Process of making ready for printing from blocks and forms. - Google Patents

Description

D. HENNEQUIN & B. PLAGNES. PROCESS OF MAKING READY FOR. PRINTING FROM BLOCKS AND FORMS. APPLIUATION TILIZD MAR 21, 1908.

91 1,497. Patented Feb. 2, 1909.

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DANIEL llluh'h liQUlN AND LIDUUAIU) lLAGNlflt-i, F lAltlt, FRANCE.

PROCESS O1 MAKING READY FOR PRINTING FROM BLOCKS AND FORMS.

Specification of Letters Patent.

Patented Feb. 2, 1909.

Application filed March 21, 1908. Serial No. 422,425.

I '0 all! whom it may concern:

Be it known that we, D.,\.\'1nL Hnmvaonuq and EDOUARD PLAGNESQ citizens of the French Republic, and residing at 139 Rue de V augirard, Paris, l rance, have invented certain new and useful Ilklj )l'0\"tl-ll'lt3l1t5 in the Processes of Making Ready for Printing from Blocks and Forms, of which the following. is'a specification.

As is well known a great loss of timeis occasioned in making ready for printing and it thus receives from blocks and forms, by reason of the inequalities which are present in the surface of the different blocks in one and the same form. Heretotore theseinequalities have usuall been removed by arran in Linden lays either under the metal of t efiilock or overlays on the platenor impression cylinder. This work requird great skill, scrupulous-care, is very tedious and does not always give satisfaction because the edgesot these nnderlays or orerlays form inequalities relatively to the tltljflCBllll edges that have aninjurious effect on the uniformity of the printin Now the improved process which forms the subject of this invention has for object to avoid this loss of time while providing an automatic register of the counterparts and an absolutely uniform pressure over all parts of the block of one and the same form.

. The improved process consists in coating the platen o'r impression cylinder with a layer of material capable of taking an exact impression of all the ine utilities of the surface oftlic blocks. This impressed iayer which constitutes the counterpart of the locks of which it follows the concavities and convexities exactly remains in place on the platen or impression cylinder-during:

rinting. The sheet to be printed is placed Between this impressed layer and the form, uniform pressu e and as it bears uniformly on all pointsoi the said forin,' the impression resulting" therefrom will hate absolute sharpness both in the.

the block. This double result is o tained by the prorcss described hereinafter and of which the Accompanying diagrammatic drawing shows the ditlerent stages ot'- the method of working in which: W

Figure 1 shows a form 01 priutinp machine and a cylinder as seen licl'ore putting in the form. Figs. 2, 3 and 4 show these same parts during the successive stages of putting in the form.

It is assumed that the foruuc, composed oi' removalilc type process blocks and line engraving blocks. The blocks having been brought to type height at their lQfl'NJCliVC places in the form in the usual mama-012a proof is then taken from which the margins outside the blocks are removed. The platen or impression cylinder, 1), is then clothed with stretched sheets the last of which is intended to take the impression. of a hand roller the blocks are coated with a composition 0 Fi 2 ca, able of causiu each proof (1 above mentioned to adhere momentarily to its respective block. This first composition is such that it will fix the proof "cry lightly upon its block while affording suppleness to the impression which will he made subsequently. This composition is composed per 1,000 grams of about 600 grams of powdered white lead and 300 grains of VflSQllllQ well worked up together with the addition of 100 grams sulfuric ether. The proofs having been thus fixed upon their respective blocks they are coated (Fig. 3) by means of a brush with a certain thickness of another composition 0 consisting per 1.000 grams of about 270 grains of asphaltum and ih t grams of powdered white lead mixed togetlwr and dlssoived in .320 grams of heuzm. This mixture is well worked up together and si'l' cd and to it are p This second coxuadded 50 grams of ether. position c sets otter drying for a for. s conds. and. as soon as it has become suit e By means oiently r sistant to the touch, it passed The blocks a.

of .the blocks as well as of the place occupied by each counterpart on the laten or impression cylinder. Immediate y afterwards a sheet 9 which has been previously moistened is pasted on the platen or impression cylinder 0 and a' proof is taken. The weak parts which may exist in .the engravings are stren thened by applying over the proof 9 thus o tained'a few coats ofthe as )haltum composition in greater or lesser thickness, according to the degree of intensity of the faults, and another sheet, h, is pasted on as before (Fig; 4). Then an impression is taken in the machine for the pur-' pose of distributin uniformly the excess :omposition. This distribution is always effected uniformly so that there need be no h sitation in coating again rapidly 'to some, extent the parts adjacent to those which are considered as'being weak. If this is necessary the operation is re eat-ted, until a perfect result is obtained. %Vhen the proof is considered to be a good one, the make-rpady is complete and the printing is proceeded with in' the usual way. v 7

From the foregoing, it will be seen that a print thus obtained hasequalized in a perfect manner the pressure over all points of the block so that the, sheet to be printed is obliged by this counter art to take all the ink placed on-the metaL' he pressure isso well regulated that the faults of the wooden foundation cannothe felt unless it contains cavities of an extent which are never encountered in' practice. The impressed ilay'er bein com osed of a material whichis both supp e an firm, offers less resistance than the metal, andutherefore cannot crush in the latter at the place where there may be cavities in the wood. Further, as. the sheet takes the ink at all parts of the block by reason of the uniform pressure thus produced, there is no necessity for appl ing too much ink as is'often done with a efective make ready and consequently the lights in the en ravin s will remain very clear and the solids will be sufficiently intense. suitably regulatin the inking, spotting W1 1 always be avoide and. 't wil not be necessary to insert flyleaves in caseswhere strong engravings areprinted which require a very copious supply of ink. The ingredients ofithe'two compositions I fort Havingthus described our invention, what employed in this process may obviously vary,

the essential feature being that these comdrying material.

The term cut out proof sheets used throughoutthe claims is used to define the proof sheets which are trimmed or have their margins removed outside of the blocks as set in the first paragraph of'page 3. l

we claim as new and'desire to secure by Letters Patent is 1', The herein described improved process of making'an overlay for a printing form containing engraved blocks, which consists in coating the blocks with an adhesive composition having a mineral'basis, placin .cutout proof sheets on said blocks, app yin pressure to cause a momentary adherence 0 said proof sheets to said blocks, and coating the back of said proofs with an adhesive uick dr in'g .plastic composition derived from a so ution of material m-ether, forming in same anexact counterpart of the concavities and convexities of the blocks and removin said counterpart from the block's. 2. T ie'herein described improved process of making an overlay for a printing fo'rm' containing engraved blocks, which consists in coating the blocks with an adhesive solution of white lead, applyin cut-out proofs to the coated surface of sai blocks, coating the backs of saidproofs with a plastic com: position of asphasolved in an ether and ,asslng said blocks with said coated proofs t ereon through'the' machine whereby the said coated proofs are transferred from the blocks and caused to adhereto theclothing of the impression element of the printing machine.

In testimony whereof we have hereunto set our hands in presence of two subscrlblng Gnomes BONNEUI'L.

he same turn and white'lead dis-

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