US1837671A - Ink removing contrivance for printing machines - Google Patents

Description

Dec. 22,1931. w. J. PIRIE 1,837,671

INK REMOVING CONTRIVANCE FOR PRINTING MACHINES Filed Dec. 26. 1929 r c F 15 K rr T r 11 K I "1 1':::. 1-1".- r' J I L 0 FIRE. H I N Patented Dec. 22, 1931 pair-an stares parsni $1 i: E*4

IL QIAM JAMES main, or EDINBURGH, SCOTLAN INK nnMovINs coNraIvA cn FOE PRINTING MACHINES Application filed December 2c, 1229, Serial No. 416,408, and iii Great Britain May 31, 1929.

In order to facilitate the removal of ink from the inking rollers of printing machines various contrivances have heretofore been proposed with the objectio'f cleaning the srpllers without removing them fromthe ma 0 ilne. I

The aforesaid contrivances' may bedivided' into two classes namely those in which the ink is scraped from one of the rollers in the inking train and those in which the ink is wiped from one of the rollers. In contrivances of the former class which have been found more satisfactory in practice, a scraping blade is held in contact with a roller which revolves towards or against the edge of the blade. Contrivances of the other class employ a flexible wiper or rubber strip which wipes the ink oil the-roller, the latter being revolved away from the edge of'the wiper. The solvent used for thinning the ink has a deteriorating effect on the wiper if made of i rubber. V v

In contrivances of the scraper type, the suggestion has been made to mount the scraping blade so that it is held in radial contact with, one of the soft or composition'rolls of the inking train, but such an arrangement is not satisfactory as the blade damages the resilient surface of the composition roll; It

: has also been proposed to mount a sharpedged blade in contact with one of the metal 7 rolls and at anangle to it soas to-strip the ink from the metal roll, but in such case a v stilt or rigid blade is employed clamped bep tween top'and bottom clamping plates so as to protrude from them, and means are provided for adjusting the protrusion of the blade from said clamping plates in order to adjust the parallelism of its edge to the axis I of the roll. Means are-also provided for ad justing the scraping blade into and out of its operative position. The ink scraped offby the blade flows by gravity into a trough provided to receive the ink. A suggestion has also been made that one of the inking rolls should be scraped by a scraping blade which is unitary with suction means for withdrawing, the ink removed by the blade. The present invention relates to'contrivances for removing the ink from the inking edge of which is mounted substantially tangential to the roller and. opposedto the direcrollers by the sc raping'a'ction of a blade held 1 in contact with one of the metal rolls of the inking train and the invention consists'i'nfthe employment of a-flexible scraping bladeQthe tion ofrotation 01"- the roller and is resiliently pressed against the surface ofthe roller by .theblade wherever it is required to ensure good contact with. the roller? The ipressing members may consist'ofspring fingers mounted upon and ad ustable along a. rocklng shaft or like member which is rock-ed to causefthe spring fingers to press upon the scraping blade. i The flexible scraping. blade in conjunction with the spaced pressingniembers issuperi or to a rigid blade as it enables any. undue wear that may take place along the length of i the edgeof the blade to be immediately corrected by moving one or the'spring pressingmembers along to the point of correction and adjusting it so that it will apply sufiicient pressure. to the edgeofthe 's'crapingblade at 1 that point to bringthe worn point of the scraping edgeon'ce'again into contact withthe roll. a i

It is-preferable that the scrapingablade it should be in contact'with a positively driven or gear-driven metal roll as the useof. a thinning agent'for thinning the ink tends to cause I a friction-driven roll to slip andflcea se rotation'if coacting with a scraping blade.

. The ink removed by the scraping blade falls by gravity-into a trough which inthe preferred form accordingto' the present in- I vention is so constructed as to be capableof being up-endedwithout spilling the contents and which is also readily detachableso'that' 7 it can be removed from the machine for emptyingwithoutdanger of the contents being spilled over the printing machine.-

A further characteristic feature 6f the present invention is that thescraping blade is carried'by a bar of angle section, the angle of which rests loosely over and rocks upon a anink fount B I a p The scraping blade C is a flexible metal 1 blade, jpreferably of steel, slightly longer fixed rod, the scraping blade beingthus read-- ily removable by lifting the angle-section bar from its supporting rod, while at the same time the scraping blade can be moved clear of the inking roller by rocking the anglesectionbar on its supporting rod when the ink is not to be removed from the inking rollers.

In order that the invention may be more clearly understood, reference is hereinafter made to the accompanying drawings, whereon Fig. 1 diagrammatically illustrates theink distributing mechanism ofia printingmachine having my invention applied. Fig. 2

is a side viewof the inking roller and scraper,

Fig. 3 is a detailjview'to a larger scale and FigJ4= a fragmentary perspective viewfof the inktrough.

. Referring to Figs. l'to 3ofthe drawings,

fArepresents one of the-gear-driven'metal ing machine. The roll rolls of the train of inkin rollers of the print- K revolves in the direction of the arrow against or towards a scraping blade C. The roll A revolves in 7 contact with other inking rollers B supplied with ink through a messenger roller'B. from than the inking roller Aand is'fixed to a' bar D of angle: section which is supported "on a shaft G which is fitted'acrossthe printing machine.

. "When the inking roller is revolved in the direction of the arrow and the ink on the inking rollers, A, B is thinned. by a suitable solvent, the ink is scraped ofi the roll A by V the blade C" down which it runs into a trough or receptacle H which is-supported under I the bladebysuitable brackets I whichare fixed to'the rod V The'trough H is longer than the blade C and is of suff cient capacity to retainall the ink removed from the inking rollers. As ,I 1' shown in Fig.4, it is preferably covered in except for a long'open slot h in thetop thereof, said slot stopping short of the ends of .the trough whichis preferably cylindrical as 'shown,so that when the trough is up-ended,

' the ink will collect inthe cylindrical'portion 'h-'(Fig.' 4); and will not flow out of the trou'ghowing to the endof the slot h being I at a distance from the end of the trough.

Theapparatus can be attached to any printingmachine whichhas a suitably acces'sible gear-driven metal inking roller re- I volving in the required direction and for this purpose I have shown brackets'J attached to the frame L of the printingmachine, the

design of the brackets 'J being governed by the shapeand' design of the part of the printthe apparatus may also be used for the procing machine to which the 'contrivance is to be attached in order to bring the steel blade 7 tained in that position by a suitable catch e such as a spring pin .K,"until again required, when it will fall by gravity into contact with the roller 1 A on withdrawing" the spring pin K.

'The shaft G'carrying the spring fingers F is rotatably mounted at it'sends in the brackets J and carries a lever M which; can be retained in one of two positions by a spring pin N or other suitable catch, whichserves to retain the spring fingers in eithertheir operative or inoperative 'position "When the spring pin N is withdrawn, the lever M i can be moved to rock-the shaft G and thus bring the spring-lingers into or out of'contact with the blade C. *The spring fingers F are movable along the shaft G so that they can be set in any desired position in order that any desired local adjustment may be given to the blade. j 7

The spring fingers F do not require adjustment after thebladeis once set except where a new blade is fitted to replace a worn blade. I The blade when in use iskept true to thesurface of the inking roller by the spring fingers F and'is kept sharp by the rubbing or sharpening'action of the contact of the metal roll with the edge of the blade when the ink-removing apparatus is in action.

Although,.my invention isprimarily intendedfor cleaning theinking rolls of the machine when the printing process has been stoppedand the supply of ink to the inking rollers has been interrupted, in order that the colour of the printing may befchanged,

ess of sheeting ofl, i. e. removing surplus ink during the printingproce'ss, without the use of any ink isolvent, this sheeting-off op-. eration'being desirable in certain cases in order to restrict the supply of ink to the printing surface when matching up'colours on making ready. The slightest change in shade of ink can be effected successfully by sheeting-oil with this" apparatus.

The present apparatus does not interfere cessibility off the parts of the printing machine and can be completelydetachedfrom the machine'if necessaryby removing the brackets J from the machine. The apparatus however does not normally interfere with the removal of theinking rollers. asthese can ordinarily be removed without touch except toa verys'malldegree with the-ac-" 12 ing the inkrrenio'ving apparatus, but if more accessibility is desired, the blade C with the bar D can belifted bodily off the rod E and ing provided fixed brackets I.

I scraping blade and the trough H have been removed, there are practically no parts left to interfere with accessibility to the machine. Moreover the blade does not require 're-adjustment when replaced on the rod E as it automatically takes up itspreviously adjusted position when the spring fingers F are brought into action. This is an advantage as it permits of the blade being frequently removed for cleaning purposes.

Claims.

1. The combination with the inking train of a printing machine, of a flexible scraping blade in operative relationship with one of the metal rolls of said inking train, a rocking member associated with said blade, and a plurality of spring fingers mounted upon and adjustable along said member and adapted, when said member is rocked, to resiliently press the edge of said blade into contact with the roll. 7

2. Apparatus as specified in'claim 1 having an ink-receiving trough associated with the blade.

3. The combination with the inking train of a printing machine,

the metal rolls of said inking train, a rocking member associated with said blade, supports along of a flexible scrapingblade in operative relationship with one of the inking rollers of a printing machine, comflexible scraping blade, abaroi prising a an le section to which said blade is secured,

a xed rod upon which said angle bar is adapted to rest and rock to hold the scraping blade in operative relationship with one of the metal rolls of the inking train, a plural- I of spaced pressing members-distributed a the blade, and meansfor moving said pressing members into orout of resilient contact with the blade;

ity

7 The combinatlon with the inking train of a printing machine, of brackets removably attached to the printing machine frame, a stay barconnectingsaid brackets, a rock shaft pivotally mounted in said brackets, a

bar of angle section resting by one of its angles upon said stay bar, a flexible scraping blade carried by said angle bar for cooperation with one of the metal rolls of the inking 1 train of the machine, retractiblemeans for temporarily supporting said blade in an in clined position with its edge out of contact with said metal roll, a plurality fingers mounted upon and adjustable along said rock shaft, means for rocking said shaft to cause said fingers to resiliently press upon of spring the blade and an ink receiving trough detachably supported by said stay bar in a position to receive ink removed by the scraping blade. igned at Edinburgh, in the county of Midlothian and United Kingdom thisv29th day of November, A. D. 1929. i

i WILLIAM JAMES PTRIE.

removably attached to the printing machine I for removably supporting said contrivance at its ends, thereby enabling it to be bodily removed from the machine, and a plurality of spring fingers mounted upon and adjust able along said member and adapted, when said member is rocked, to resiliently press the edge of said blade into contact with the roll.

L. In combination withthe inking train of a printing machine, a scraping blade held in contact with one of the rollers of said inking train, and an except for a long open slot which terminates at a distance from the ends of the trough so that the trough may be up-ended without spilling its contents.

5. In combination with the inking train of a printing machine, a flexible scraping blade adapted for scraping contact with one of the gear-driven metal rolls of said inking train, a bar upon which said scraping blade is rockably supported for movement into and out of contact with said roll, a plurality of springink receiving trough covered in

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