US1833767A

US1833767A - Doctor cleaning device

Info

Publication number: US1833767A
Application number: US406276A
Authority: US
Inventors: John E Woodbury
Original assignee: Individual
Current assignee: Individual
Priority date: 1929-11-11
Filing date: 1929-11-11
Publication date: 1931-11-24
Anticipated expiration: 1948-11-24

Description

NOW 24, l931- J. E. woODBuRY 1,833,767.

DOCTOR CLEANING DEvIE Filed Nov'. 11.,4v 1929 `s sheets-sheet 1 v ya y NOV. 24, 1931. E, WQQDBURY- 1,833,767

DOCTOR CLEANING DEV I-CE Filed Nov 1l, 1929 3 Sheets-Sheet. 2

may; n

J. E. wooDBURY 1,833,767 44 'DOCTOR CLEANING DEVICE 5 Sheets-Sheet 3 Filed Nov. 11. 1929,

I f Zi/ebs ,7a/1 .2505@7 Patented Nov. 24, 1931 Unirse Aemr-:Es PATfEcN-r lor12214111?. p

'Jon1vn.uvvoomsumr,` or: wonensmnr., MASSACHUSETTS lDooren.` cnnnnmennvrcn I f Y' Application led November 11,;1929L1WSeria1iNo;;406,276.`

tor. in the position. the. ink is about ,-This'invention relates to the inking ofintaglio plates or dies in .a machinelfor linev printing.

'The principal objects ofthe invention are i 5 .to provide means for reducing the amount of ink used at each operati-on in Va machine of this type; to provide means.' for cleaningwaV doctor after each inking operationv to remove the` surplus ink therefrom; vto provide means lo'for engaging the 'doctor on its inked side at a distance' from its scraping edge and ,moving over the doctor to remove' the'ink therevfrom; to provide means for supporting the doctor behind the scraping Idevicernear its "15 edge, an'd to provide, theseelements in combination `withthe usual means for vibrating Ythe doctor while in operation ina machine in which, the die or, plate is vpositioned Vwith its printing side up. Y' 1 Other objects and advantages ofthe invention will. appear hereinafter. I leference is to be had tothe accompanying drawings, inwhich v V1 .-isfa side view of anintaglio printing-machine, with a preferred embodiment of this invention applied' thereto and: shown in. printing position 'Fig 2 isa plan of: he rdoctor andshaftffor supporting it,.as.indicated by thearrow 2 iny Figil, showing` adjacent parts in section; v

Fig. ,3 is an end view-ofa kpart of the'doctor vibrating device, as indicated lby the =ar row 3 AinFig. l; y

Fig. Lis Aa sectional view onthe line L41 oflig. l;

Fig. 5i is-avertical sectional view through the press, of the die carriage showing the operation ofv printing,'v the .parts being in* the same position asy inF-ig.' l;

IFigsnand? are-side elevations -of two of the camsemployed; l

Fig. 8 isa sectional view: of the die chuck land associated parts, illustrating the v. position of the doctor while the first coat ofink isI being applied to the die Y ,Fi-g. :isa` sim-ilarviewshowing thedie vmoving in i the` 'opposite direction Y and the doctor in position for removingthe 'surplus link; I

to be removedfrom'it, :and themean's lfor f moving theldoctor scraping blade.;Y ,and

lF ig. ll is aI vsectional view of the tank yfor holding the ink removed from the doctorfand showing the Wayin which'it, isfsnpported.

It lis customary to. make v`printing' presses of the die stamping type,V wththefde the pressrface.up,so that theprint ismade` on 'fit the lowerface of the` sheetasztlieson: the feed table of, the press. ".'Itisalse customary to pass thedie .under a cushioned, pad covered witha die wiping :pa-per. whichremovesall the inkffronn the.y face .of-.the die preparato@7 f .to printing. VThis system has long beenV open to Serious criticism"` becausea relatively. large v'amount of ir'ikis.wasted.atY eachprinting operation .andalso 1a'. largefpiece l.of die a wiping paper,Y .is required for` each' print. `xThese two :if: items representen largean expenseithatsome eifortshave beenmadeto savezthisfwaste material. 'Asifar ask-IA .am .aware, these, efforts have beenmostly inthe .direction of inverting the. vdie and providing a doctor. funderneath :which =slants .downwardlyand removes qthe ink from the plate or die andthen. Vdisposes type .ofl machines lirstdescribedfabove. :This however', involves considerable expense to establish, in, .l a plant vfalreadyy,working `onV the ,type of machines rst described above. This invention vis Vdesigned Jto .avoid the necessity .of scrapping old machines .f and putting. vin theA inverted. typeandrto. provide. for `saving nthe Waste. ink/.inthefordinary*type of: machine and also to save in the amount of-wipingpaper employed.' f

Referring to" Fig.V .55. this shows a'machine .of the 4ordinaay type wi-thi. this invention-- applied thereto. Y In this machine, there is a die itil carriage 10 on Awhich-is located aj'chuck l1` vin 9 .which is mounted-1 their xprinting pla-te or 'die '12. '.Thesethree partsxarerec-iprocated in the .directionoflthe-arrow. 'i-When inthe position shown the rant 13 risesan'd the palper-located on the 4die .is pressed-,against the counter 14:. TheA 'pri-nt isnmade on thej lower face. .of-the sheet .between ythe die l2 .and the counter 14.

Accordi-ng tof this inventionr-atransverse horizontalcshaft 15..is employed which carries fi a doctor 16. This doctor is so located that it can act on the die or plate 12 in the manner shown in Fig. 9, while the die is passing back to its printing position. It will be understood that first the die moves as indicated in Fig. 8 with an inking roll 17 irl-contact with it and the doctor out of contact with it, as shown in that figure. Then when it moves back, the doctor comes down on the plate and scrapes the ink from it on its last motion toward printing position. The ink gathers on top of the lower edge of the doctor 16 and this invention has to do with the removal of that ink before the next inking operation. It is found in practice that the amount of ink left on the doctor 16-is so small that'it will not run off and cause any trouble if it is wiped ,off after each inking operation, although if left on wit-hout wiping for several operations, it will begin to drip ofil Vand cause trouble for that reason. Y

For the purpose of operating this machine, two shafts 20'and21are used. Although the gearing is not shown herein, it will'be understood that these shafts are connected with each other and with the shaft which controls the reciprocation of the die chuck so that they work in a certain sequence. The shaft 2O oscillates whilethe shaft 21 rotates.

'The shaft 21 is provided with a gear 22 meshing with a pinion 23 on a shaft which has a crank 24 operating a link 25. `This link is vconnected with an arm 26 fixed on a shaft 27 provided with a fixed arm 28. Therefore, a rotation of the shaft 21 will swing this arm 28 back and forth. When it is swung inwardly toward the frame of the machine, it pushes the shaft 15 with it, and when it swings back,

la spring 29 brings the shaft back again.,V This of that shown and tothe dotted lineposition in Fig. 1;

At the top of this link 34 is connected ak spring 36a also connected with the top of the Aarm 31 for holding the roll 32 upwardly as far as'it will go and with yielding pressure on the print-ing plate when ink contact with it.

To the top ofthe link`34 is connected another link 37 which is pivoted to the short arm of a bell crank 38 pivoted on the frame of the machine. This bell crank is normally vheld down at its front end by a spring 39 and is provided with a pivoted link 40 'which is ypivotally connected to anotherbell crank 41 carrying uanother cam roll 42. On the shaft 21 is a cam 43 having two circular arcuate Vgoes down'with it and forces the roll over the rounded end of the cam to the dotted line positionin Fig. 1. Also the link 37 is pulled down as indicated and the link 40 also moved downto inove the roll 42 into contact with the cam 43, but at present this is on the part of the cam which has the larger radius. The effect of the ycam is to move the doctor far back to an inclined position and the effect of the cam 43 at this time isto hold it in the position shown in Fig. 8 where it does not touch the plate and keep it in that position until the cam 43 rotates around to bring the lower part of its cam surface into registration with the roll 42. This allows this roll to move inwardly further, urged by the spring 39. This results in swinging the link down a little more and moving the link 37, and with it the link 34, backwardly away from the guide surface 36. The real effect, however, is to bring lthe cani 35 a little back of its dotted lineposition and to allow the roll 32 to move withit so as to bring the doctor 16 down on the die 12 as shown in Fig. 9. The doctor is held against the inked die by the spring 36a.

Pivotally mounted on brackets 45 carried by the die carriage 10 is a doctor cleaning frame 46. This frame carries a small receptacle or tank 47, which is provided, projecting up from the top, with an inverted L- shaped stop 43 adapted to come up back of the doctor, as shown in dotted lines in Fig. 10, and back up thev doctor while it is being cleaned. The tank 47 is held in place on the ,frame 46 by springs 44.

4Also mounted on this frame 46 is a shaft 49. Two

arms

50 and 56 are fixed on this shaft. To the arm 50 is pivotally connected a link 51 carrying a rotatable stud 52 to which is secured a bar 53. This bar is also secured to an oscillatable shaft 54 located on the frame 46 and carrying fixed thereto a scraper blade 55. It will be seen that this shaft 54 with its scraper blade can be turned and by the link 51.

On the shaft 21 isa cam 57, which by means of a roll 58, pivoted arm 59, and link 60, operates the arm 56 and the scraper blade 55.

The doctor cleaning frame 46, as previously stated, is pivoted at 61 and is adapted to be raised and lowered about this pivot by a link 62 which is operated by a lever 63, roll 64 and cam 65 on the shaft 21. By raising the scraper blade will lrise'above the bottom" scraper blade carried byfsaid frame, meansV for lifting said frame-to a position in which of the doctor, and means ffor swinging the scraper blade against :the doctor, 'whereby thescraper blade will move down along the surface of the doctoras the f frame moves y down, to remove the ink yfrom the doctor.

11. In an inking device,rthe combination with a` doctor for removing the surplus ink from an intaglio die or printing plate,a shaft on which said doctorismounted, means Vfor turning theshaft from a position in whichV the doctor engages the printing plate toa position wien, the doctor hanging down from 4the shaft, a frame hung pivotally, a scraper blade carried by said frame, and movable bottom of-` the doctor, and means operated by the other zam for swinging the scraper blade against the doctor, whereby the scraper blade fac' will move down along thefsur'face .of the 'doofv tor as theframe movesfback, to remove thel ink from the doctor.

12; In an, inking .doctor to ia vertical position'with its operative edgeVV down, of a movable frame, af shaft pivoted on said frame,` alink connected with, said shaft to ,be operatedgthereby, a scraper blade, connected with the lirikmotionfand' movable to two positions inone-fof.which` it: -v

isback away frointhe doctor and-intheother it is up in position foritsv edge to enga-ge the Asurface of the doctor on vwhich the ink iscolvlected,.means for operating saidlink motion. and' means for `moving' said fram'elup' andv down to cause the scraper blade by said combined operating means to rise and move against the surface of the doctor and then descend vertically to scrape the ink from the doctor.`

,i 13. In an inking device, the combination l with a chuck for supporting a printing plate or die and means for'reciprocating said chuckV in a direction parallel with the, `top printing 50 faceof the dieof means for'inkiiigthe die as"` y v it reciprocates, an oscillatory sha-ft,.]`a link connected with said shaft, af guideffor the link, acam onthelink, a shaft, a doctorbla'de for the die mounted-on said'shaft,acam roll' having its axis fixed withrespect to said shaft and adapted to operatey the shaft when `thecarn roll is engaged by saidcam'due tothe Aoscillation of said arm, c f l 'Y 14. Invan inkingdevice for intagliofprintQ ing plates, the Vcombination with" means forreciprocating the plate and an inkingvdevice `for applying ink thereto, ofa doctormonnted in position to scrapeth'e ink from the plate, a shaft on which tliedoctor is located,"a roi- V Y, tary cam having two arcuate surfaces,fone,.

up away from the printing plate varid"down inked, a shaft ,on which the doctor is located, l

y l Y Y n n yieldingpressure,wherebyjwhenfthe device y the' y @mbmtio l held aganstitsffcam, that cam. will? posiii-,Wely l4V with aldoctor `andl means-for .tnrning'the "this i roll engagesyjand yyielding fmea Vholding the rollfagainst Vthisv Cain,

second link, a third;l link extending fromthe j Y @fthez'jdoctorl blade witlirespect tothe printingl f VLsuirfm of thedie.' i f `f @are iowa-eageofahei doctor, and massif@ p Y 1 1turningthe scraping blade thedQ ,1;912",y 1

V the first namedrfmeans Lacting; to y draw fthef itc-"remove ink therefrom.' f

against the 'camgan oscillating arm, a link i connectedto said arm; a Vcam on the linkfor i i,

oscillatingkthe doctor shaftto 'turn thedct'or,` r

on its surface alternately as thel arm oscillates and meansoperat-ed by'saidcam rollfr. hojldlrv ingthe blade in its two extreme positions; .i 1 15;,Thecombination` with means4 for re-j ciprocating a printing plate-zandlan .inking T011 VOIV applying ink thereto' both onitsiforf'- lward and backward fmotionsfofl a doctor. mounted "inv position toV scrape the ink `from the plate onits reversemotionaftervit isV anfoscillating arm, a linkconnected tosaidryY 7 arm, a: cam on they link for oscillating the shaft and the doctor toturnthe doctor npV away from the,print'ing'plate` and downionp i its vsurface alternately;asthe armloscillates, g v a rotatablefcam havingaliighapdlwpgur;

face, a bell-"crank havingja 'fr ollf,v thereon iadaptedto engagethe'lastnamed campmeansf". t l

connected with said 'for opefratin" a th bell-cr'ankltohold it against` the cam i ll-,is 1.

locate the doctor either against the printing f plate' or inan V'elevatedposition away itV vaccording towhich surface V:ofthe rotary cam ,-forf:

16:; rhe-,comiginaeoa wahratiruckjfef Stip;

porting ja printing pla-te or 'die `and'lm'eans#for reciprooatingsaid chuck in fab vv'dirlectioii parallel with the upper printinggfacefof the die, of lmeans for inking' the'. die'. as!itfjre-jv ciprocates, f an oscillatory shaft, a link fjcn'ai nected lwith saidfshaft, arguidejfor thevflink, a ,spring,holding'thelinkagainst thefguide,,` l v y a cam on ithelink,A a shaft,a,doctorforfthedie` mounted on said yshaftf,a cam roll on `Vsaid shaft, a link extending from; the `first named' 1 opposite arm ofthegbell-cranhfa rotary cam,l

and a cam roll operated. `by therlast named Y linkto `,engagesaidrcftarly cam,.wherebytheVV y cano will positively determine the Vposition oflel'fl 't .ll'7j.*j111f.an'` inking device, the combinatio with;a,doctoradapdtofremove the inlrfrifjrn a rrietee Platani Scraprfblade; means formovingfthefscraper blad/esto apoint above;

scraper .blade along the {Surface-.ofthedoetorj 125.

V-Inj'testimon whereof,j If have; rhere'urito afiiXed'Ymysignature.,:y j 1 -1