Патент USA US2406205код для вставки
v ' Aug, 20, 1946'. ' x'w; DAVIDSON ETAL] 2,406,205 ' PRINTING- PRESS ‘ 4 Filed. Dec. 7. 1.942 ' 5 She‘ets-Shé'et 1 Q. ' INVENTORS William Ward Dal/Z6190’? ‘ BY ' ?an/bi 5mm” “I . HTTYS ' Aug-‘20,1946; ' w. w‘. DAVIDSON tr AL r PRINTING PRESS ‘2,406,205. _ Filed Dec. '7, 1942 ,- 5 Sheets-Sheet 2 ’ I-—- o-— .2 2/ . *N v , ' g _ " - , > . ' _ } INVENTORS. William, Ward-Davidson _ ‘BY .?a/zkJBrn/Jm 147715. Aug. 20, 1946. 2,406,205 W. W.“ DAVIDSON ETAL _ PRINTING PRESS _ Filed Dec.‘ "7, 1942 5Sheets-Shéet 3 _ v " INVENTORS. _ Wdléa/n WQ?a’LhI/MSQ/Z , ' x I Aug- 20, 1946- ‘ w. w. DAVIDSON ETAL. 72,406,205 PRINTING PRESS Filed Bed. '7, 1942 ~5 Sheets-Shee't' 4 ' 5777.51; Aug. 20,194§.. ' w. w. DAVIDSON arm. PRINTING PRESS ‘ ~ ' 2,406,205 ‘ Filed Dec. 7, 1942 5 Sheets-Sheet 5' IRS v zdsolz . ;~ P2172012 HTTYS' . Patented Aug. 20, 1946 ‘ 2,406,205 UNITED STATES ‘PAT'ENTYI OFFICE ' PRINTING PRESS William Ward Davidson, Evanston, and ‘Frank J. Breman, Chicago, Ill., assignors to Davidson Manufacturing Corporation, a corporation of Illinois Application December 7, .1942, Serial No. 468,100 6 Claims. . , (Cl. 101-232) 2 ‘1 Under the best conditions, ‘feeders for feed ing‘ sheets to printing presses have done a very good job of feeding the sheets against the stop ?ngers of the printing roll in such a way that accurate registration would result. Under ad verse conditions, however, as when the sheet has a tendency to curl, thefeeders have not always functioned so Well. Quite often the registration Fig. 9 is a fragmentary perspective view of the gripper bar. 7 Fig. 10 is a perspective view of the mounting link by which the gripper bar is secured to the chain. - ‘ i Fig, 11 is a sectional view showing the securing , of the gripper bar to'the mounting link, being taken approximately on the line II—H of Fig.'8 is imperfect, and with some feeders the sheets and have to be removed H) . A preferred form of the invention has been by hand. . chosen for illustration and description, in com According to the present invention the printing pliance with Section 4888 of the Revised Stat gripper and the feeding means so cooperate that utes, but persons skilled in the art will readily failure to obtain perfect registration is rendered perceive other means for accomplishing the same virtually impossible._ This is accomplished by results, and the claims are therefore to be-con guiding the sheet all the way into the jaws of the strued as broadly as possible, consistent with the l gripper so that there is no possibility for a curl prior art. , ‘to, cause the leading edge of the sheet to fail to ‘ General organization and Operation enterthe gripper or to pull away from the stop (inverted). ‘ may occasionally jam ?ngers and thus produce inaccurate registration, ' ' In the form of the invention chosen for illus tration the sheets, which have been initially sep arated and fed automaticallyin timed relation At the same time other disturbing factors are cor rected—factors which might interfere with the registration as by causing vibration of the ma chine or applying unstable tension to the chain with the press, are fed by va conveyor board D against feeder stop ?ngers E. .At the proper time - ~ carrying the printing grippers. , feeder'pressure roll H iSIlO-WGI‘Bd, ‘and the stop Additional objects and advantages of the in ?ngers Eand the feed rolls coaxial therewith are vention will be apparent from the following de rotated to. feed the sheet to the grippingv and > scription and from the drawings, in which: registration stop unit Q, which carries the sheet Fig. Us a somewhat diagrammatic vertical sec tional view of a printing press chosen for illustra 30 to the bite of the printing rolls I and M. As seen in Fig. 3, the printing roll I may include a litho tion of the present invention, the view being graphic plate J and a platen K. The roll M is taken approximately on the line I—'l of Fig. 2. half the diameter of the roll I and bears a blanket Fig. 2 is a horizontal section of the structure L which cooperates first with the plate J and thenv shown in Fig. 1, with the upper printing cylinder with the platen K. In short, the plate J, after and certain other parts removed for the sake of clarity. , ‘ ' being inked by cooperation with the dampening \ ' unit N and. inking unit 0, prints a reverse image Fig, 3 is a view corresponding to Fig. 1 but of the matter to be printed on blanket L,,Whl0h taken approximately on the line 3-3 of Fig. 2. in turn prints this matter on the underside of a . Fig. 4 is an enlarged fragmentary sectional sheet to be printed, the platen K pressing the view ‘corresponding to Fig. Band showing the 40 sheet against the blanket L. After being printed, parts at approximately the time'the sheet enters the sheet is turned over and dropped into a re the printing gripper jaws. ceiving box P printed-face-up. To this end the Fig. 5 is a view corresponding to Fig, 4 but ‘ gripper unit Q is carried by chains around the ' guide unit S to a ‘point where the grippers are opened by cam R to release the sheet. The grip-. showing the parts after they have moved slightly beyond the positions shown in Fig. 4. Fig. 6 is a fragmentary detail sectional view showing the mounting of‘the feed guide roll. , Fig. 7 is a vertical sectional view taken approx-7 imately on the line 1-1 of Fig. 4, showing the cooperation between the feeder stop ?ngers and‘ the guide thereabove. pers are again opened by cam T to receive the next sheet. zations thereof are possible butv they, need not , 50 I Fig. 8 is a fragmentary sectional view taken ap proximately on the line 8-8 of_'Fig. 1, showing the cooperation of the‘gripper bar and the sheet discharge stop. . ' ' ' , ’ In the illustrated form of press, other orga'ni- ' be described since they are not necessary to the‘ practicing of the presentinvention nor to the understanding of the operation thereof. Indeed, for the purpose of understanding the'invention, the roll M could be one'of the printing rolls of any 65 printing press, and the gripping unit Qncould‘ bev , 2,495,305: or evening 0f_;the two ends of‘ the guide member 3|.“v although ‘this 'issnot considered necessary. ‘V ' ~Gripp'eo? vand 'reyi'strationi stop‘ um't ' » " Because of ‘the relatively narrow opening ofthef 6. engaged bya cam follower roller 63.911 .thelend; ofwacrank armr-?4jrigidly carried :by' the shaft’. 56-? However’, when the. cam .R is engaged by‘ the. roller_6_3 at the point for releasing. the sheet, the gripper unit is positioned?along the straight. ' gripper jaws thereis substantially nochance that _ reach of the chains 46, and hence the thrust‘: the ‘sheet will curl to such an extent wi'thinthel of the cam R on the roller 63 can easily twist gripper .that it will be torn. or indented as the the gripper bar 21 angularly as well _,as‘thrust— gripper ‘ ?nger closes. However,v there would nevertheless be a possibility, if conventional stopf 10 ing it downwardly; Such displacement of the fingers were used,. 'that‘imp'erfect "registration could result from having the sheet pressagainst' one of the stop ?ngers ‘?rmly enough to cause I gripper.‘ barIZl' can ‘set up abnormal, strains in- the chain'4B and start vibrations which‘mig'ht c'o‘n} extend substantially all along the length of the a support bar 1| mounted inside the pressfrainei ceivably, cause improper registration of the ‘sheet.' Such irregularities are prevented in accordance slight distortion of the sheet at that 'point,'with with the present invention ‘in thema'nner' seen‘ the result that one side of ‘the 'sheet would be" , v . , ' V _V advanced slightly more than the other. 'Accord-f 15 best in Figs. l,_8"and 9. ‘The cam R is carried by a plate 68 which pro-l ing ‘to’ the present invention, this danger is'com— jects from a sliding‘ carriage 69' whieh'slides'fe'nf pletely overcome by having the stopshoulders 26 gripper vbar ‘21, being notched only where neces and spaced'therefrom'by studs 12. .'I'h'e_1115DerT sary to receive the gripper ?ngers 28 or other 20 surface 13 of’ carriage 69 forms a raceway for a‘ roller 14 journaled at the end of shaft '56,‘ so necessary cooperating parts. ‘ " I a '_ ' that this shaft is rigidly braced against outward" Since the gripper bar 21 does not seat on'any movement'during the time that the cam R exerts part of the cylinder M butis' carried entirely by a thrust on the follower 63. -The leading. edge chains 46, a ?rm'and dependable connection be of the raceway or bracing surface 13 may be re tween the gripper and the chain is essential for lieved slightly to ensure the smooth movement complete accuracy in registration.v The chains of the roller 14 onto the raceway ‘I3.v ' , ' ‘ ‘ themselves will seat dependably and uniformly on. the sprockets by which they are carried. Of Release stop course, it is also desirable that the connection be tween the chain and the gripper bar 21 be quite 30 It. will be observed .thatatlthe vtime of the reg-v‘ simple and inexpensive.‘ The mounting link 41‘ factory. Although this is called amounting link lease by action of the cam Rthe sheetwill have a substantial momentuminthe direction follow ing the gripper unit Q. InM-vorder to ensure its. dropping neatly onto the stack of sheets in the that it might be considered only half of the chain the grippers before they again close, it isde-Q shown in Fig. 10 and the assemblythereof shown in'Figs. 8 and 11 have been found to be very satis ’ for‘convenience, perhaps it should bementioned .35 receptaclebox P and also to ensure its leaving link since it must be paired with‘ another link sirable to provide a stop member 8|, for obstruct-v plate 48 at the opposite side of'the chain 46. ing the continued movement of the sheet. The We have determined that the secret of depend stop member 8| is preferably carried by arrod 82_ able rigidity between the ‘chain 46 and the 40. extending rigidly- from and carried by.‘ the car-a, gripper bar'21 is in avoiding any ?exing of the riage 69V. Thestop member 8| is. preferably pro-i horizontal portion 49 of'the link. According to the present invention, this is‘ayoided by provid-,; ing ?anges 5| at the end of the ?ange 49 and vided with resilient ?ngers 83, ‘which project ‘into; slots 84 in the gripper bar 21 on opposite sides of " by clamping the horizontal ?ange 49 between the central lug 51.bar Z1 Because is accurately the} vertical determirieéi “ tion of the ‘gripper two legs 52 formed at the end of the gripper bar 21. The clamping pressure is applied by a screw 54 countersunk in one leg 52 and threaded into by the raceway 13, the grooves ‘84 neednot extend; much below the gripping face of'gripper'bar; >21‘. the other. , ' a . . ‘ in order for the ?ngers 83 to safely extendto a; position where they will dependably obstruct the. continued movement of a sheet in contact with L' ‘ The gripper ?ngers 28 are actuated by a grip per shaft 56 which is journaled in lugs 51 formed saidface. The carriage 69 ‘ may 1 ,' be moved ' along I .the’jlbar-l on the gripper bar 21. It is ‘preferred that each of the gripper ?ngers 28 grip thev'sh‘eets against gripper bar 2'! independently of the others, and 7| to a position corresponding to the length of: the sheets, so that it will cause discharge of the. to this end each is provided with its own spring sheet at the earliest moment which willresultlin, 58. In order that they may act independently in. this manner, however, they must have some lost motion with respect to the shaft 56, and there fore eachv of them (one exception being per missible) is provided with a suitable lost-motion means for actuating it to the open position. For example, each ?nger28 may be provided ‘in its hub with‘a slot 59 in which a pin 6| is positioned, thelpin being rigid with the shaft 56. When a grip ?nger 28 is at rest against a sheet, the pin 6| should be slightly spaced from the end of the slot 59 which it will engage in opening the grip pers_ ' , a v . Sheet release When the gripper unit is passing around the cylinder M, the tension on the chain draws the chains ?rmly against their sprockets with enough’ tension so that neither the chain nor the gripper b‘ar‘Z'I is appreciably a?ected by cam'li’z which 60 proper dropping of the sheet onto the stack in the. receiver P so that there will be maximum visibility f of the ‘sheets on the stack. The carriage is seé'? cured by a lock nut 86 in. any position. to which the _ It carriage has been is found adjusted. that control 1 ._of the . >_ sheet a , _, is; improved by providing a guide Iwire8l loosely-l suspended, from the middle of Va crossbar: 88 ._ 65 ?tting'looselyin a__ slot in thebottom end plate 829‘: of the receptacle P. I , . _; _Y ‘As the stack of printed sheets is removedfthe»: guide wire‘8'l'l will slip out or its; slotito avoid/Q obstruction of the removal of the stack. .While the guide wire 81 is in place there is no danger-7 70. that, the sheets will ?oat or be blown over the end plate 89. ' . _ . I. From the foregoing it is seen, that a press} has been provided which prints with.‘ accurate." registration dependably even under.“ adverse‘ 715, conditions such asu'when" the sheetsdihaveliaw 254063265‘ gripperjmeans; having is, ?xed "position - with‘ ‘re-7 spect to- -sai'd~~ roll- at the time that " a ‘sheet held thereby-enters,_the.;>bite1: of.;-.the xiifh?llggcouple, tendé?oyftofcurl. "This dependability is *ac complished with apparat which-is quite simple and in fact-"representsevery little additional cost 7 means for. causi-ngthe gripper means toopento c as ycomparedi ~ ‘00* the -_simplest ' type of structure receive a sheet, and, means’ for feedingv .ajsheet withinithe gripper means while said gripper means "is open comprising means for engaging suitable for vhigh grade printing heretofore known- " ' ' ' I ‘We claim‘: the"; sheet andiorwarding the‘ sheet to ithejgrip ' 115a printing 7 press, including a printing ,, per ‘means; .a table‘: on whichjthe sheet tslide's couple: one-"member of-which- isa printing roll,- ~ when ‘moved toward the gripper "means, sub’ 10' gripperxandv registration stop "means having-a stantialh7 unyielding ,lguide means, converging towardfthegtable to direct the “leading edge of ?xed. ’ position " with 1 ‘respect to said 'roll‘ at; ‘- the time‘ 'that a sheetiheld "therebyientersthe: bite of- *thejprinting‘ couple, ‘means’ for ‘causing the theljjsheet close. “to the , table,v and‘ ‘?nal jguide meansf'?xed ‘withrespect to the table ‘for caus ing the :sheet to bend“beyond‘"thetable into‘ the gripper-means to opento "receive a sheet, and means for feeding a sheet" ‘against the stop . opened gripper means ‘and against;a registra meansgwhi'le, said gripper 'meansis ‘open com- ‘ tion stop‘ ‘?xed "with ‘respect :to, said gripper prising "feeder istop ‘?ngers; Vmeans for feeding means ‘and jfulvlybl‘ocking the throat t'hereof,._ said *?nalguidefmeans extending into lateral a Sheet‘againstthe stop-?ngers in timed rela tion ‘to ‘the operati'onofl the press, means for alinem'ent‘ with v‘the ‘opening gof said , gripper; slde=registering *the vsheet before itleave's the feeder stop?ngersyguide means inclined toward the "feeder stop ?ngers andyprojecting' between theffe'eder 'st'op?ngers to ensure engagement of means whereby passage ‘of thesheet between ‘ the ?nal guide means and theigripper meansis positively jprevented‘. 4. A_ printing ‘press 'inclu'dine a printing‘, : roll; sprockets ‘at the endsvv of 'the printing roll, a 'shéetwith said‘feeder 'stop'?ngers, means for ' engaging ‘the sheet adjacent the feeder ‘stop ?ngers while itgis'incontact therewith and for warding the sheet ‘to the vgripper and stop means, said stop means blocking the throat of the gripper, a table on which the sheet slides between the stop- ?ngers andv gripper and stop means',yguide 1means ~'~converging toward‘ the table ‘to direct ‘the leading edge of the sheet chains carried by‘the sprockets‘, a gripping and registration stop‘unit c'arriedby'thel'chains, and means'to ifeedsuccessive sheets “to ' the. gripping and registration stop runit:for successive print; ingoperations with "exact uniformity; ‘said; grip pingaand registration stop unit having hori zontally. slotted ends,reach end‘ being vcarried-by 30 a side'ppl'ate forming. one of ‘the .links, of the with "respect-to the table ‘and extending into chain, and ‘having, a horizontal '?ange ?tting closely into ‘the slotted ends ‘of said‘ gripping causing the's'heet- to bend'beyond the table to a ' and" registration stopj unit, verticalg?anges ,rigid' with, v‘and; extending'upwardly from :saidlhori close ‘to ~ the; table," * and close ~ proximity iwith ‘the printing couple for, 35 direction'proper for-entering the opened grip zontak?an'ge. spaced to receive and support said gripping and registration stop unit,,.an'd means intersecting the plane ‘of said?nal ‘guide means 40 for: rigidly‘ assembling said unit to" the _ side; plate, whereby 'thelpositioninfg of the. gripping and whereby; passageof;the-sheet between the, final per “means, the 1 plane ' of the’ open ‘ gripper means guide means-and the .gripper‘means is“ positively registration'stop'unit with-respect to the chain will 1-be ' uniform‘ ‘for successive ‘printing opera ' prevented: "2. 'A *printing’ press including a printing tions‘: couple ‘one member- of-which is a, printing, roll, ’ and registration ‘stop’ means having‘ a ‘ gripper‘ ?xedposit-ion 'with respect ‘to ‘said- ‘roll 'at the time that‘axsheet held vthereby enters- the’ bite ' of “thaprinting couple, ‘means for causing the gripper meanstoopento receive ‘a sheet, and , 5.‘ The combination ,ofygripper means for :a printing press, ‘means ‘for. causing, the gripper means-‘to open to receive‘ a sheet; registration stop: means extending ‘across the "throat, of the gripper; "and'means for ‘feeding va sheet within, the, gripper means while. said gripper means Li's meansv "for ‘feeding a ‘sheet- vjagainst the stop, means while ,said ‘gripper means islpen com prisin'gffeeder' stop ?ngers; means for feeding open~=comprisirlg 'means for engaging?the sheet and) forwarding ,the ‘sheet to ‘the gripper means, a sheet‘ against ‘the "stop: ?ngers in ‘timed; rela tion ,to “the, operation of the press, ‘means ‘for sidef-registeringthe sheet ‘before it leaves the feeder‘ 'stop' ‘?ngers; 'means vfor engaging "the stop ‘?ngers and “gripper means, substantially _ close to vthe table, ~‘and ‘?nal, guide means» rigid sheet'ad'ja-cent-the, feeder stop ?ngers while, it is in contact therewith and forwarding the, with the-table forrcausing "the sheet to bend beyond the table-‘to aK'dilL‘CCtiOIl'PI'OPBIVTOT ‘ex a ‘table ‘on ‘which the sheet slides ‘between "the unyielding guide means converging ' toward the table to direct the leading edge iofgthe ‘sheet sheet'to-thegripper and'stop-rneans, said stop tending into the ‘openedp'gripper‘means and ex means blocking the throat ofY-the “gripper, ,a 60 tending-‘into lateral alinement'rwith the opening table’on which'the sheet slides betweenthestop f ?ngers and-grip'perand stop means, substan of " ‘said jgripper ~means‘ whereby passage of the sheet ‘between ‘the finalguide means‘ and the ' tially- unyielding ‘guide 'means' .convergingto-, , ward'the'table-to direct the leadingfedge ofthej gripper means is positively ' prevented.‘ or - sheet close to the table, and'?-nalvjgu'ide ‘means- ' ' , ?xedwith-respectt0 the table iorcausing the shéeti'to bend beyondjthe vtable into the opened“ "BF-In Ia printing-press ‘oi‘the'type- comprising a printing "couple; sprockets .Jdriven with the couple and chains carried‘ibythe sprockets, the combination "therewith of" a bar carried by the gripper means and extendinginto lateral aline chains, registrationustop means ?xed in posi ment'with the opening 'of saids'gripper' means 7O5 tion with respect to gripper means on “said bar, whereby passage of the-sheet between the-?nal the gripper means including jaws" having “a lim guide means and the gripper means ,and, lim ited opening, 'r'means ior'opening‘the ‘jaws in perfect ‘registration due to :sh'eet‘curl "are jjp'os'i- 7, - couple, timed-relation :‘Saif'd stop 'tO'lthB "means, operation ‘Positively of? the limiting printing the tively fpreven'ted. , ' including, “a ' jprintinfg " 1 oouple’onef'member ‘ of vcwlii‘chtis a~printing roll, ' 75*travel "of a sheet'into ‘the ‘gripper jaws, a ‘feed 2,406,205 table, means for forwarding a sheet over said table into the gripper jaws in timed relation with the_operation of the printing couple, ?xed rigid lower guide means extending into close proximity with the path of the bar and inclined upwardly, to initially ?ex the sheet, rigid upper permit passage of the gripper jaws, the feeding means and gripper jaws operating in such timed a relation that the sheet is forwarded into the .gripper jaws during the interval in which the plane of the open gripper jaws intersects the guide means in ?xed relation to said table ex tending downwardly into close proximity with the path_,, of the bar for directing the sheet downwardly from the lower guide into the grip 10~ per jaws vand against the registration stop, said upper and lower guide means being slotted to plane of the upper guide means whereby pas sage oi’ the sheet between the upper guide means and the gripper jaws is positively pre vented. - ' " WILLIAM WARD DAVIDSON. FRANK J. BREMAN.