US2518876A - Base for printing plates and a method for manufacturing same - Google Patents

Description

Aug. 15, 1950 MQFRETZ BASE F0 RINTI PLATES AND A-METHOD R MANU CTURI SAME Filed July 4, 45

Patented Aug. 15, 1950 :BASE .FOR PRINTING JPIJATES LAND A METHOD FQB.MANUEAQIUBINGSAME fM xS tz, Zuri h, Switzerland Application July- 4, 1945,5Serial Nn. 5033120 In Switzerland J annaryifi, 1M5

12 Claims.

Nowadays zany :half-tone .plate used for printingtis fitted on Woodtor leadablocks. In each case it is,ne.cessany to-treat these blocks with a block .leveller .machine, .in :order to obtain the correct height. :wood blocks permitted the half- 7 tone plates to .-betnailed, whilst on lead blocks ithaylhad to be mounted with glue foils or the like, or with glue.

Any plates nailed upon -wood blocks have the advanta e, that the first Tmake-ready canbe inserted between -.;the plate and the block, but .wood blocks have the disadvantage of warping. .l helead blocks instead have the advantage to pe.,,absolute ly :level, {but the-disadvantage not to Jae able to insert [the .nrst make-ready between pl-ateuandrblock,since they are-glued together.

'lifurthermoreithe pasting of thetblock requires fi theating efetheabloek and, a-subsequent pressing nf tth -mlate on :the zhlock. ,Heating is .again iregllil iddid.-I;II1(D=Vthe plate from the block.

The object of the present invention is to eliminatevthe above-said disadvantages, by casting a material adapted to be casted around inlaid pieces f il l material. Theseiinlaid pieces consist preferably of amateriahwhose coefiicient of expansion is at least approximately the same as that of the material casted around them.

One preferredembodiment'of the-object of the presvent invention is represented schematically on itn iadibimns n tlihtiblock 4 consists of agrateifi composed of l and 2 of the same :breadth, and with a d eightgoorresponding tortilla-height. of the blocks l. "pg-he bars ii ,:and 2 have notchesl-fi equally-spaced I pan thus be set into eachiother at any 1distance, to buildupaconvenient. grate. The material of the bars I and 2 willbe preferably pearwood, athe texture being wery dense and easily dialled. .Leadis castintoithisl -grate toithe same height as i the .bars, building up :a solid :block of lead. A block leveller machine levels lead and wood at the same time. A block with a fine smooth surface of lead with wooden bars is therefore obtained. These blocks can be sawed to any size; without the block falling apart, due to the Wooden frame in the block. As may be seen from the upper part of the drawing, the bars I and 2 reach partly to the surface of the block-mount. Between these visible parts, the bars disappear under the surfaceof the lead.

Instead of wood another kind of nailable mate rial may be used, for instance, plastic material, whilst the lead or lead alloy may be substituted by some other metal or plastic mass.

Instead of a grate composed of crossing bars,

2 individual pieces of nailable material .may file provided, Whichare castdntofileador into ,ajl'eaii alloy.

lnstead of leadorjlead alloy, botherralloys with a lowrmelting point may also be used.

What Itclaim and wish to secure by Ilniteid states .LettersPatent is:

.-A,method.for the manufacture of a baseffor printing, plates comprisingthesteps of: assembling .a lpluralityoof vbars of a nailable material crossin eachiotherso as to form a gratehaving a plurality of empty. spaces eachof a configura- ,tion substantially. in the shape. of a parallelogram,

' each-of saidfbarshavingaseries of notchesatuat least. one ,ofits sideedges, andpouring acasftali'l'e material. over said grate. so. as t o.fil1.in.the\emp1j spaces .,-of .said grate including .such ,ndtche's whereby. a solid. block otcastable materialuhaving the, main, portions ,of. saidbars embedded therein is formed.

2.,Amethod for the manufacture of atbased'or printin aplates comprising (the steps .of .lassembling a ,p'lurality of .bars .of a nailable .matefidl crossingleachother so. asto, .i'ormv a. grate having a plurality of emptyspaceseach ,of a configurationsubstantially inthe. shapeofa parallelogram, eachbf said bar'ahavinga series of notchesa'tat least one .fl'flits side ,edges, pouring ,a ,ca'stable materialoversaidgrate .soas toAfill in the empty spaces or said grate including such notches ,,wlureb,yv asol idlolock-of .eastablamaterialjhavin the main porticns .of saidfbarswembedded therein is formed, .and levelling .the "base in such a way that thesurfaces of. spaced portions of ,saidhar's .between said, notches are .flush withatleast one surface of said .block.

3. "A method for thetmanu'facture of, a' base for printing ,plates comprising the, steps of: assembling a plurality of .barsof a nailablemateridl grossing. each other. so as (to form. a grate having a plurality of empty "spaces each of a configuration substantially in the shape of a parallelogram,

each of said bars having a series of notches at its opposite side edges, and pouring a castable material over said grate so as to fill in the empty spaces of said grate including such notches whereby a solid block of castable material having the main portions of said bars embedded therein is formed.

4. A method for the manufacture of a base for printing plates comprising the steps of: assembling a plurality of bars of a nailable material crossing each other so as to form a grate having a plurality of empty spaces each of a configuration substantially in the shape of a parallelogram, each of said bars having a series of notches at its bling a plurality of bars of a nailable material crossing each other and having a series of notches ,at its opposite side edges by engaging predetermined notches of said bars with each other in a manner so as to form a grate having a plurality.

of empty spaces each of a configuration substantially in the Shape of a parallelogram, and pouring a castable material over said grate so as to fill in the empty spaces of said grateincluding such notches whereby. a solid block of castable material having the main portions of said bars embedded therein is formed.

' '6. A method for the manufacture of a base for printing plates comprising the steps of: assem- 4 bling a plurality of bars .of a nailable material crossing each other and having a series of notches are opposite side edges by engaging predetermined notches of said bars with each other in a manner so as to form a grate having a plurality of, empty spaces each of a configuration substantially in the shape of a parallelogram, pouring a cfastablematerial over said grate so as to fill in the "empty spaces of said grate including such notches whereby a solid block of castable material having the'pmain portions of said bars embedded therein is formed, and levelling the base in such a way that the surfaces of spaced portions of said bars between said notches are flush with opposite surfaces of said block.

A base for printing plates comprising: a grate made of a plurality of bars of nailable material connected with each other, each'of said bars having a series of notches at at least one of its side edges, and a solid block of a cast material arranged in the empty spaces of said grate including such notches, the main portions of said ,barsbeing embedded in said solid block.

8, A base for printing plates comprising: a

grate made of a plurality of bars of nailable materialconnected with each other, each of said bars having a series of notches at at least one of its side edges, and a solid block of a cast material arranged inthe empty spaces of said grate including such notches, the main portions of said bars beingembedded in said solid block, and the surfaces of spaced portions of the side edges of said ,bars between-said notches being flush with at least one surface of said block.

9. A base for printing plates comprising: a

grate made of a plurality of bars of nailable material connected with each other, each of said bars having a series of notches at its opposite side edges, and a solid block of a cast material arranged in the empty spaces of said grate including such notches, the main portions of said bars being embedded in saidsolid block.

10. A base for printing plates comprising: a grate made of a plurality of bars of nailable material connected with each other, each of said bars having a series of notches at its opposite side edges, and a solid block of a cast material arranged in the empty spaces of said grate including such notches, the main portions of said bars being embedded in said solid block, and the surfaces of spaced portions of the side edges of said bars between said notches being flush with opposite surfaces of said block.

11. A base for printing plates comprising: a grate made of a plurality of bars of nailable material, each of said bars having a series of notches at its opposite side edges, said bars being connected with each other by the engagement of predetermined notches with each other, and a solid block of a cast material arranged in the empty spaces of said grate including such notches, the main portions of said bars being embedded in said solid block.

12. Abase for printing plates comprising: a gratemade of a plurality of bars of nailable material, each of said bars having a series of notches at its opposite side edges, said bars being connected with each other by the engagement of predetermined notches with each other, and a solid block of cast material arranged in the empty spaces of said grate including such notches, the main portions of said bars being embedded in said solid block, and the surfaces of spaced portions of the side edges of said bars between said notches being flush with opposite surfaces of said block. 7

MAX FRETZ.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 360,307 Klopsch Mar. 29, 1887 1,928,821 Hoge June 4, 1912 1,158,852 Richardson Nov. 2, 1915 1,185,438 Richardson May 30, 1916 1,530,752 Brooks Mar. 24, 1925 1,898,668 Jones Feb. 21, 1933 FOREIGN PATENTS Number Country Date 17,809 Australia Jan. 12, 1929 358,651 Great Britain Oct. 15, 1931

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