US1050982A - Means for preventing offset. - Google Patents

Description

G. G. MURRAY.

MEANS FOR FREVENTNG OFFSET.

APPLICATION FILED JAN.27,1906,

To all 'whom l for manip atin PATE-Nrormcn @51cm-LY, orfmm- Be it known that I, Gronau a-,citizen of. the United States,r and a resident of Larchmont, county of Westchester, and State of New York, have invented cer-- tainnew and useful, Improvements ini .Meansrfor lPreventing Offset, of which the following, is a specification. y i 'Myfinvention rel tes to the preventionvofI offset; printing* ressesand other mecha.

the same partie ar y useful as carout in connection. with presses for p y printin 'on both sides of paper or similar materi In presses of tins character andi various mechanisms Ifor mani ulatingf. printed material7 and especiall f res print-l ed paper, as for example de iver mechanisms of printing pressesand fo1d1ngmechanismsif the inkbearing surface of the printed materialY comes in contact wlth any' art of the mechanism some of the' inkmay' transferred to such part, especially where there is anyl pressure exerted between the contacting surfaces, and after `a certain amount of ink has been thus transferred it begins to lset of or oifset, asit is termed, .unto the passing material; Great' diiiiculty1 has been experienced in prevent this oii'set, especia y in the iiner classes of printing, where not only is the oset morel apt to occurby reason of the naturev of the materials used but even .a slight` amount of. defaoemcnt due to ofset consti? tutes a most serious defect. Although much: amention,` has beenv paid to this matter by those skilled in the art, no solutionof` the problemA has been-.reached which is generally applicable, and. particularly which will per.- mit of the iiner grades of printingv being performed on perfecting presses, land articularly on -rotary perfectm presses w 'ere the, impressions on the opposlte sides of the paper. are'eected in'substantiall' instantaneous' succession,'. and `*where e printed'- productv cannot be' manipulated, as in `foldmg. or delivering `,withoutcontact' with the fresh printed sur aces. n v

My invention. hasl forl an ob'ect to produce means whereby the de acement of printedv4 matter by' odset may be efectively prevented, and .more particularly to rovide means whereby o'setting may be e ectively prevented without inf any manner injuring camminano: umarmen Tippmann-anc January a7, isos. semina, esame. j

G; Mumien rinted material sroafrnnvnmeme y Q Patented'. Jan. 21, 1ers.r

-'material, whereby the complicat 'and expensive mechanisms now commonly used 'for ythis purpose may be dispensed' with.

These and? other objects of the invention 'will 1n part be obvious and' in -part be pomted out inthe followin' "description 4 I havefound that er' of ink from fa printed' surface to a ,surface with which it comes m contact. will' not take place, to a harmful extent', at' least, `in the presence of a stable emulsion, even where the surfaces are fbrought into contact under heavy pressure, Isuch 'for.e1m.mple a's exists` between an impression surface and' [the material being printed thereon. #To obtain ood" results-the surfaceof the-member to wich the emul- Qsion is applied is preferably slightly roughen'ed or grained or mad'etoA a certain extent porous so that' it will more readily carry a ,suitable quantit-y or supply of the emulslon. I n the case of an impression member ofl a rintin press, moreover,the surface should e yiel in yor flexible or of'such a nature that it wi 'properly support the paperI or other material to Ibe printed in contact with the design member, and where the usual pacling 1s employed on the impression mem- 'ber the emulsion carrying member should be impervious tothe emulsion so as to preivent the destruction or impairment of lthe jpacking materials.

I have found an emulsion or a mixture of oil and water or similar substances in the 'nature of an emulsion, and particularl an emulsion or similar com ound of hoile linseed oil, or linseed Aoil o like character, and water, to give good results when used in `connection with the impression member of a printing press, the proportions em loyed @being one part of oil to three parteci water 'with a little caustic soda t'o facilitate the ,emulsication of the oil in the water. Where boiled linseed oil is employed, it is preferably used in a substantially pure condition, the oxidizing agents commonly found in the boiled hnseed` oil of commerce being omitted. The emulsion may, however, be

a machine b which my method mayr be carried into e ect and which constitutes `one embodiment of other features of the tion.

Of the drawings, Figure 1 is a view partly diagrammatic and partlysectional illustratingfa printing press constructed in accordance with my invention, land Fig. 2 is a sectional view on an enlarged scale illustratingin more detail one of the impression members of the press.

Referring to the drawings in detail, the press there shown com rises an impression cylinder l around whic are arranged a series of design cylinders 2 adaptedtoy rint -`afseries of impressions on one side o the paper. As shown, this press is intended to prmt upon paper or similar material 'in web form, the web being continuously su plied fromaroll 3. After passin around t ev cylinder l and receivin severa im ressions.

from the design cylin ers, the we passes between the impression and design membersl 4 and 5, respectively, of a second printing mechanism whereby it receives impressions upon its opposite side.

to a suitable delivery mechanism, that shown including a set of conveying tapes 6 and a set of 'cutters 7.

' To revent o'set of ink' from the lrst printe side of the web to the surface 4of the impressionmember 4, the surface of the latter kis supplied or provided with the emulsion. This may be accom lished in any suitable way. In the particular construction shown there is placed over the usual packing ing 8 of the cylinder a sheet or member 9 of material whichI is impervious to theemulsion and which is at the same time provided with asuitable porous or grained surface adapting it to carry a suitable quantity or supply of the emulsion without liability of transferring the same to 'a harmful extent to the surface of the pa er or material being printed. Preferably, thls layer or member 9 should be flexible and yet not sufficiently soft or yielding to prevent the proper impression of the design upon the paper.

I have found certain forms of artificial leatherl used for book binding and other purposes to give satisfactory results. lVhere the impression cylinder is used in connection emulsion.

After leaving the second printing mechanism, the web vpasseswith a relief im ression surface, I haveemployed an arti cial leatherknown to the trade.as pantasote to answer the purpose, the heavy. cloth basic layer of this material bein removed, if desired, to make the ma- 'teria less soft and yielding. rlhis material affords a surface which is suitably porous or grained and at the same time the material 1s insoluble in and impervious to an Aemulsion of boiled linseed oil and water.

Any suitable means may be provided for maintaining a supply of emulsion on the impression surface. As shown, a simple liquid ist-ributing mechanism is employed for the purpose, thesame consistin of distributing and ,applying rollers 10 an 11, a fountain 12, and an intermittently operated convevin or ductor roller 13. l y

t will be understood that my invention may be carried out in connection with other surfaces which come inl contact with or manipulate the printed material. As shown,

for example, the, delivery tapes' 6 which serve to convey the printed material from the second printing couplje to thepcutters 7 may -be .supplied with an ink repellent p In accordance with the preferred construction these tapes are formed of a material whichis impervious to the emulsion and affords a suitably grained surface. For example, they .may be made of or provided with a surface member of the arti-v cial leather referred to, and suitable means as the applying roller 14, fountain 1'5,`an`d ductor 16 may be provided to maintain a supply of emulsion thereon.

It will be understood that my invention in.

its broader aspects is not limited to the precise com ounds or devices herein specifi-- cally set orth, as many changesmay be'made respectin the materlals and constructions .em loyer? in carrying out m invention wit out de arting from the main principles thereof an without sacrificing its chief advantages. o

What I claim is:

' 1, An antioset device consisting of a member for manipulating printed material, said member having its bearing surface provided with a stable emulsion.

2. An antioifset device consisting of .a

member for manipulating printed'material, said member havin its bearing surface provided with an emu sion of oil and water.

. 3. An antioiset device consisting of 'a4 member for manipulating printed material, said member havin its bearin surface r0- vided with an emu sion of boi ed linsee oil and water.

4. device for reventing offset consisting of a member or manipulating printed material, said member havin a suitably grainedv surface provided with a stable emulsion.

5. An antioset impression member havlessees ing is suifaee provie wth e. stabie emusion.

6. .6m sniofse impression membe navei? oil emi weten entiofse imgnession membe naving i'ss suiaoe povie with am emulsion oz" boiie iiixseefi @ii ami water.

8. 5.11 azitioise impression device having e, suece ovide with e Smbie emusien, seii es'ice being impeivieus the emusien.

9. pining ess ineuiiing in combineion, es iizepessiem membe having iis ss?- see pievi e eil emuisioi oi esiiesi iiasee @ii and issie?, :m means :for meisaiiiing s suppijf ci; emulsion se sai s aee seifi Azlfleiizbe being impewiozis the emuision.

il @fining press iiie'uilig is combisu'eee pevideci Wih am emulsion of boiled lef. ing pi'ess inciuciing in combinaiois, mesas e making s, puiaiiy of impessions apen ene sie of the maei'iui, and means is? pin'ing iie opposie side of iie ai e impressies member of said ias@ name@ mesas having ils su'iface pievide Wiiz s s ie emuisioi.

an-iosed vice consisting of e Ins-mise? foi manipuiating piined meeiiei,

mem e? having an oue? iayei" with impression membei imi'- mg suie? iieziibielsyer healing a sui'm'z-i A ien, kiffe? being impervious i0 les.

iii es-imony wiieeof, have signe name is Tis speeicaion, in the presence @i "me Subsc-sisiiig ,iiiesses.

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