US2639667A - Curved platen printing press - Google Patents

Description

y 6, 1953 J. F. JIROUSEK CURVED PLATEN PRINTING PRESS 2 Sheets-Sheet 1 Filed June 5, 1947 INVENTOR.

JO65PH F'. J/RQUfiEK BY ATTORNEY-5.

y 6, 1953 J. F. JIROUSEK CURVED PLATEN PRINTING PRESS 2 Sheets-Sheet 2 Filed June 5, 1947 INVENTOR.

J05EPH F. J/ROUJEK aTrola/vixs.

Patented May 26, 1953 CURVED PLATEN PRINTING PRESS Joseph F. Jirousek, Cleveland, Ohio, assignor to The Chandler & Price Company, Cleveland, Ohio, a corporation of Ohio Application June 5, 1947, Serial No. 752,732

This invention relates, as indicated, to platen printing presses and more particularly to such presses in which a rolling contact is obtained between the sheeton the platen and the form. It has long been recognized (see U. S. Patent No. 1,034,083 to Clark, dated July 30, 1912) that there are certain advantages in cylinder presses over the Gordon or platen type press including the fact that the sheet to be printed contacts the impression cylinder progressively with relatively little area in contact, whereas in the conventional Gordon press the entire sheet carried on the platen receives the full impression from the form at one time. This calls for the application of a great deal of force and requires great strength and rigidity in the supporting elements of the press.

In my application Serial No. 672,631 Platen Printing Presses, filed May 27, 1946, now U. S. Patent No. 2,602,396, I describe and claim a platen printing press affording rolling contact of form and platen in a manner to effect a firm and consistent reproducible impression. The present invention relates to certain improvements in the operating mechanism of this type of press.

It is most important that the means employed to move the platen into and out of impression position be firm and positive in their action and also that such means should not obstruct the platen and interfere with the feeding of sheets to and the delivery of sheets from the same.

It is, therefore, a primary object of my invention to provide improved operating mechanism which will thus permit feeding and delivery of the sheets from either the forward edge or from the sides of the platen. Such mechanism is particularly arranged to facilitate so-called crossfeeding and delivery of the sheets wherein the sheets are fed from one side of the platen and delivered to the other side.

Other objects and advantages will become apparent as the following description proceeds.

To the accomplishment of the foregoing and related ends, said invention, then, comprises the features hereinafter fully described and particularly pointed out in the claims, the following description and the annexed drawings setting forth in detail certain illustrative embodiments of the invention, these being indicative, however, of but a few of the various ways in which the principle of the invention may be employed.

In said annexed drawings- Fig. 1 is a front elevational view of the upper portion of a platen printing press constructed in accordance with my invention; and

4 Claims. (Cl. 101-297) Fig. 2 is a side elevational view of such portion of such press.

Referrin now more particularly to the drawings, the main frame I of the press supports the form bed 2 in which the usual chase and form (not shown) are adapted to be secured by the usual locking mechanism 3. The frame is recessed at each side at 4 to permit the lower inking rollers 5 and 6 to move inwardly after their downward passage across the form whereby the upper inking roller 1 is enabled completely to traverse such form. Tracks 8 are provided for such rollers leading from a conventional fountain and distributing disk (not shown).

Mounted on said main frame to each side of said form bed 2 are racks 9 extending downwardly from said form bed except where interrupted by recess 4. A platen l0 having a convexly curved face adapted to engage in rolling contact a form carried by said form bed is provided with curved racks ll along each side and extending downwardly therefrom. Said racks II on said platen are adapted to mesh with racks 9 on the main frame of the press in cooperative engagement whereby a precise positioning of the platen relative to the form bed is obtained and preserved. The downwardly extending portion I2 of the platen I0 is more sharply curved than the sheet supporting face thereof and the corresponding portions of racks II are likewise more sharply curved than in their upper portions. It will be seen, therefore, that when the platen I0 is rocked to a closed position, as shown in dotand-dash lines in Fig. 2, the teeth of racks 9 and II will progressively mesh, recess 4 being bridged without difficulty, until rolling contact has been made with the entire face of the form. Because of the increased arcuity of the lower portions of racks II, it will likewise be seen, as illustrated in solid line in Fig. 2, that the platen in open position may be caused to assume a substantially horizontal position thereby greatly facilitating the feeding and delivery operations.

To operate the press, oscillating the platen between solid line and dash line positions of Fig. 2, the following means are provided:

A cam l3 having a large eccentric lobe is keyed to shaft I4 journalled in the main frame of the press. Two arms l5 and 16 carrying cam roller l1 therebetween are keyed to rocker shaft 18 likewise journalled in such main frame. Roller I1 is adapted to engage said cam I3 whereby rocker arms I9 and 20 also keyed to shaft 18 are adapted to be oscillated between solid and dash line positions, as shown in Fig. 2. The

upper ends 2| and 22 respectively 01' such rocker arms are pivotally connected to the upper portion of the platen Ill.

The lower portion [2 of such platen is provided at either side with cam followers in the form of rollers 23 and 24 adapted to travel along camways 25 in side brackets 26 and 21 mounted on the main frame-=1. These cam-ways areidesigned properly to controYth'e movement'of the lower end of the platen as the same is rocked into and out of impression position through the actionof" rocker arms I 9 and 20.

In order to obtain the requisite pressure during the impression, meansi'are'provideddimitirig outward movement of low'ei portion I'ZO'fthe platen. Such means comprise lever arms 28 and 29 pivotally mounted in the respective s'idesiof such outwardn'iovement of the lower-portion of the platen-to ensure firm rollingengagement-of such platen-with the form.

Any conventional means may' be employed for driving shaft I 4 and thereby operating :the -press,

such means ionmihg no part rof this invention. Likewise; throweoflrmeans 'may be provided similar to'that' -diseussed Johnson Patent No.

2357,1113, datedlAugu'st 29, 1944,. with tshaftz M journalled" in .anieccentric mount,:by angular adiustmentof which the platentmayzbevprevented from. coming: into impression engagement with the form;

Tcc'avoidtherpo-ssibility ofiai double impression such throw-off"meanssmay, of courseyibe icaused 'tooperate automatica'lly as the press is op'ened after eaclrimpression, in: the manner-generally describedzdnzmy cos-pending application s'erial 'No. 652K631;

It wiilwbe seen that: I=have provided operating mechanism. f ora rolling contact platen apress Wh-J C11' lSpUSll3lVE andeffici'ent "iniitss' action-but which may he -arranged sonas Ientirel'y toriavoi'd interference with the ieedingof: sheets t'o .iarrd the delivery of sheets from the'platen. Of'r'course, if desired, the: positions of' the rplatenand" the form bed :may lac-reversed and the :form" bed "tor both form bed and .platen provided with arcurved surface for rollinggcontact, .although'za ipIEfGIJ-Gd form is illustrated"and-described herein; Likewise, it is possible toprovide the:curved platen with substantially straight 'ra'c'k means and to curve the rack means 'on'the main 'framelto obtain the desired movement;

Otherrmodes'-0f app1ying the principle of-the invention .may be employed change being' made as regards. the 'details described, provided the features stated:in-='any' of the following-claims; or the'equivalent 'of suchg' be employed.

I therefore particularly point out and distinctly claim as 'rnyginvention:

1.. .Inapl'aten :printing press of the character described; va' 'mi'ti'i'izxframe a form-bed carried by said :frame, ;asplaten having a'lconvexly curved surface adaptedntozmakei rolling contact with a form. :in:saiduform-medKwhen :oscillated into im ,pression positions-rack means fontsaid framer to each side of said form-bed and extending below the impression portion of said form-bed, a convexly curved downwardly extending portion on said platen, rack means on said platen to each side of the impression surface of said platen and continuing along said downwardly extending portion below such impression surface, said rack means on said 'platen meshmg;;:with said rack means on said frame to position said platen relative to said form-bed, a shaft rotatably journalled in said frame on an axis parallel to said form-bed,

a' cam mounted: on said shaft for rotation therewith, a rocker arm .mounted on said frame and pivotallyiconnecte'd to the upper portion of said platen said .cam being adapted to rock said arm to rock said platen into and out of impression positions a cam'i track on said frame, a cam followerlon the lower portion of said platen adapted to travel along said cam track, a lever arm pivotally mounted on said frame and pivotally connected' 'to the lOwerpoftion of "said platen, and

cam means operative to limit movement of said lever "arm and"therebyfmovement of said cam follower aion'g/saidcam trackin syn'ch'ronism with'the rocking of said rocker arm.

2'. I'n'a pla'teniprinting" press 'ofthe character described, a platen convexlyicurved" andmounted to make rolling contact with aform in the formb'ed"o'f"such' press, a' mainframe, a curved rocker arm pivotally mounted on 'sai'd'ir'ame at "a" point lower-"than any operative position of said platen and pivotally connected to the 'upperportion'of 'said' platen, such 'curve and *position "of pivotal mountir'rgof saidarm "being seleoted'to' maintain said arm behind the-'line-of thefaceofsaid platen in all positions ofthe latter; whereby such face is not obstructed and feed and delivery of sheets laterally to said platenis facilitated,- cam" means operative to reel? said -arm' to rocksaid platen "into'andout of impression position, a cam track onsaid frame; a cam follower-on the lower portion of said platen adaptedto travel 'along'said cam track-as said platen is'rocked; a lever'arm pivotally mounted on a said fram'ep link means pivotall y connectingsaid lever arm to :the' lower portion 'of'said' platen; and cam :means'operative to limit movement of said leverarm and thereby movenient' oi' said camiollower'along said cam trackin synchronismwith the rocking of said rockerarm;

35- In: a platenprin-ting pressof-the" character described, a convexly 'cu'rved platen mounted to make rolling :contactwith a-form in the ifo'rm' bed of such: press, means mounted on the bed of sueh pressr-vpivotal-ly engagixigWhe upper portion of saidlplaten operatii' e to rock said platrr'into and out 1 of L impression: position; said platenrocking means ibeing located below said-platen in open position: of :said :l-platen' and: :thus t engaging said platen from below thelatterltoiavoidiobstructing laterahaccess thereto; whereby" feed 'and'idelivery of .sheets Ito said: 'platen may b'eifacilitated, and means ion :the" bed vof a such' press engaging the lowervportion offsaidirpiaten adapted -tOLc0ntrO1 in and :O ut movement of the lower tportion of said platen as said-z platen is rocked, saidilastnamed means comprising a: guideway engaging the lower portion :of said'i platen :and power driven Lmeans operative toacontrolrthe position of such. lower r portion: of isaid platen along saidfguideway;

4. In a platen zprintingapress'of ithecharacter described, a curvedplatenmountedito'make'rollwing-contact witlr aiformninftheiform b'ed of such press,:.,a rocker aarm pivotallytfmounted Jon the bed of such press andopivotally connected to'the upper portion of said platen, guide means on such bed engaging the lower portion of said platen in all operative positions of the latter, cam means operative to rock said rocker arm to roll said platen across such form, and means on such bed connected with the lower portion of said platen operative to control the position of the latter along said guide means in timed relation to such movement of said rocker arm.

JOSEPH F. J IROUSEK.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date Kuster May 19, 1908 Vandercook May 16, 1911 Clark July 30, 1912 Root Feb. 14, 1950 Willett Apr. 22, 1952

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