US2052638A - Rotary web undersurface printing machine - Google Patents

Description

Sept. l, 1936. F. c. MARQUARDT i 2,052,638

ROTARY WEB UNDERSURFACE PRINTING MACHINE Filled Aug. 20,` 1935 4 Sheets-Sheet 1 le) L Sept. l, 1936. F. c. MARQUARDT 2,052,538

ROTARY. WEB UNDERSURFACE PRINTING MACHINE 'Filed Aug. 20, 1955 4 Sheets-Sheet 2 ww AToRNEY,

Sept. l, 3936. F. c. MARQUARDT ROTARY WEB UNDERSURFACE PRINTING MACHIN Filed Aug. 20, 1935 4 Sheets-Sheet 3 Sept- 79365 F. c. MARQUARDT 2,052,638

ROTARY WEB UNDERSURFACE PRINTING MACHINE Filed Aug. 20, 1935 4 Sheets-Sheet 4 "Ma/fw ATTORNEY,-

y p cylinder. ceive, about its periphery, one or more engraved Patented Sept. l, 1936y unirse smrs Parenti-fry' asics ROTARY WEB UNDERSURFACE PRINTINGJ MACHINE.;`

Frank Charles Marquardt,lNew York, N. Y., as-

signor to American BanklNoteCompany, New- York, N. Y;, acorporationi of Ne'WfYo'rk Application August 20, 1935,Serial-No.: 37,0834

17 Claims. (Cl. IUI- 228) locatelthe mechanism used in attaching and tightening the blanketof the makeready of the The plate cylinder is adapted to resteel plates, space being provided in advance of,

and following, each of these plates, to aifordaA time interval during whichthe wiping and polishing webs may bemovedpreparatory-tof-the suci' ceeding wiping and Vpolishing of each plate or plates. Y

The paper web receives movement only during the engagement of the impression cylinder or D-'roll blanket with the paper positioned between fit and a plate upon the plate cylinder, feeding of the paper being solely by the frictional engagement between same and the two members of the printing couple during the making of an impression. Hence, the web is advanced by a step by I step movement, comingto rest following the makingof each impression.

Engraved, intaglio or undersurface steel plates areof a, greater length than the design upon the plate, and the feeding movement of the Yweb by the plate andthe .impression cylinder is therefore greater -in length than the design impressed upon the paper. Because of this condition, there would be a considerable-blankspace between succeeding impressions upon theweb it means were not pro- Ivided. in the machinezto-impart a reverse movement to the'web following the making of each impression.

Theconstruction of the membersof the printing rcoupleabove referred to, and the arrangement of the plate or plates aords a time interval: during which this reverse movement may be imparted to theiweb;` and by-accurately controlling the quantity or extent of this movement, succeeding impressions mayi be? accurately spaced in'relation to eachother. Therefore, particularly when printing postage stamps, the spacing of succeeding impressions, lengthwise'y of 'the web, may l be brought to coincide withlthe spacing of the desig'ns of therstampsupon a plate. This secures in effect, continuous lines of stamps equally` spaced, one fromfthe other, notwithstanding `thati portions of veach lineA are made by succeedingprinting operations; eachvof which involves anA overfeedof the web to an extent in excess of` the space-between the designs ofA the stamps uponth'e plate.

Postage stamps are ordinarily printed 400v on,

or Linsrightiangular 'rowsw' of 120' stamps, andi ther spacebetweenthe rows of stamps, both the longitudinal. and thelcrossz spaces, is ordinarily ifrom l fg', to af'of '21;niin'ch.l Thisrspace isprovided for/- the perforations` facilitating separation4 of i thef individual stamps.`

At the present time, coin controlmachinesarel extensivelyused in distributing stamps, and: rolls of stamps are provided for use in these machines, each roll containing a, single line of 500stamps having crossY perforations between -the stamps.

It is obvious that when perforating a web having impressions thereon of postage stamps, any

irregularity in the width4 of thespace between succeeding impressions from a plate having 400 on will result in a gradualV accumulation of error inthe locating of the cross perforations, so that in 'View of the small leeway afforded between stamps, the accumulated error will result in the' chine; andthethrowoff mechanism is. ordinarily` soconstructed that the separation of said membersoccurs onlyv upon the completion of the im-` pressionbeing made at the time of the actu--v ation` of the throwoi mechanism. Other mechanisms of the'machine, however, continueto operate without imparting anyfeeding movementto theweb; since with the separation of the members-of the printing couple, the necessary pres-` sure exerted Vupon the web between the blankety ofr the impression cylinder or D-roll and the -platel is absent.

With the above conditions in mind, I have provided a rotary `web undersurface printing machine, embodying therein a mechanism having no movementwith, or'control of, the web'during its advancement by the `members .ofA the print.-

l y Y 2,052,638

ing couple, but which, immediately that the impression cylinder or D-roll passes out of its engagement with the web, will frictionally engage an unprinted portion of the web and impart a reverse or return movement theretoy to an extent measured by the necessary overfeed of the web in the operation of the machine and the desired cross space between succeeding impressions upon the web.

In securing the desired control of the web in.

the manner described, it is essential that this'y v mechanism, which for convenience mayV be termed a drawback mechanism, be so constructed that its eiect upon the web may be between the source'oi"V power and the members *operative* upon the web to impart this reverse. movement thereto'. This intermediate mechanism maybe so finely adjusted as to ensure abso-V lute accuracy in the quantity of reverse movement ,of the web and thus ensure exact cross spacing ibetween succeeding impressions, or cross spaces which exactly coincidein-length with the cross vspacesbetween succeedingfdesigns upon the plate.

--In conjunction with the drawback mechanism, provideagmechanism which maybe termed a 'y 402 k"counter operative thereon by which, after the making of al definite number of impressions, the drawback .-mechanisnn during one ycycle .of op erations of the machine, will be made` inoperativeto impart a reverse movement to the web sofas 451' to adapt the machine to the production of stamps tobe used in rolls of 500 or any predetermined number.

' By the usel of such a mechanism, after 500 similarlyspaced stamps have been impressed upon 50;-i the tweb,...a.wide space is left upon the web, this 601" m'acl'iine which, simultaneouslyv with the operaspace, in length, equallingone or two stamps plus,

the. space Vordinarily provided. between stamps.. This wide space facilitates the separation of the *of vertical tiers of 5j0Ofstamp's, and avoidslost time andlabor in separating the web intolengths containing 50Qstamps as stated.y y

The machine Aalso includestherein mechanisms actuated,from the throwoi. mechanism l,of the tionof saidthrowoff mechanism, will interrupt the operation of therdra'wback mechanism and also yof'tlfie'fcountef mechanism, so that during e that interval whenthe printing vcouple is inop- 65"erative to 4impart feeding movement vto the web;

there will be no reversemovement'ofl the web and noactuation ofthe counter mechanism. Consequfe'ritly, when a printing operation ceases, the` position of thew'eb will remain unchanged until 75ythe throwoff mechanism has been actuated to restore the members of the printing couple to their operative position in relation to each other and theweb. A

- As will more fully appear hereinafter, the fric- 75tion'members of the drawback mechanism 'are accurately regulated for the purpose not only of web'into lengthseach length. containing a series e.

engaged with the web by springs, the action of these springs being controlled by the actuating mechanism operative from, or in .synchronism with, the printing couple. The operation of the friction members of the drawback mechanism in reversing the movement of the web or drawing it backwardly is against a spring, the operation of this spring being controlled by the actuating mechanism or by parts actuated by the throwoi mechanism, which condition permits repeated operations of the actuating mechanism for the control mechanism without having any operative effectupon this mechanism sc far as its action upon the web is concerned.

By using springs inthe manner described for actuating the'rdrawback mechanism, the source of power is utilized to so actuate the parts of the drawback mechanism as to make itinoperative upon the web, and to control the operative effect of the springs upon the drawback mechanism in amanner tosecure a desired timing in the action thereof 'upon the web. The quantity of the reverse. movement of the web is determined by the mechanisms intermediate the'source of power and. the springs and other parts ofthe drawback mechanism, thus not only permitting extreme accuracy in the control of the web movements, but permitting a constant Vquantity of rmovement of the parts of the actuating, mechanism. s .Y

The Yfriction members of the drawback mechanism operative upon the web are in the formy of Q rollers movable toward and from each other andv oscillated by-,the mechanism intermediate the source of power and ksaid. rollers, these rollers having the two-fold function ofv stopping the run of the web and imparting a reverse movement thereto.

. By the termv oscillating, a turning of th rollers alternately in opposite directions is meant,

the bearings of said rollers VVhaving no movementr toward or from the printing couple.

The invention consistsprimarily in a rotary web undersurace printingmachine embodying therein, in combination with an impression cylinder and a plate cylinder. adapted to receive an engraved steel plate of a pair of drawback rollers between whichfthe paper web runs, a clamping mechanism operative to cause said rollers to be alternately engaged with, and disengagedV from,

a web, a roller feed mechanism operative. to oscillate said rollers, main actuating means acting in synchronism with the movement of the plate cylinder,.an intermediate mechanism acted upon by said main Yactuating means and operative upon saidclamping mechanism to'c'ause disengagement of said rollers from a web during the making of an impression, and to cause the engagement of y said rollers'with .aweb following the making of an impression, and an 'intermediate mechanism acted upon bysaid main actuating means and operative ,upon said roller feed mechanism Vto turn said rollers while engaged with a web in one direction to impart a reverse movement to a web,-

and in the opposite direction while saidr rollers are disengaged from a web; and in such .other novel features of constructionand combination of parts as are her'einafterset forthV and described,

and moreparticularly pointed out in the claims hereto'appended.

Referring to the drawings, i Fig. l is a side view of a printing machine em bod-yingthe invention, the members of theprintingcouple and the frame of the machine being shown in dotted lines;

Fig-2 is a View upon a larger scale showing the j tween said main actuating mechanisms :and `said other 'mechanisms and a part of the stop mech clamping --m'echanismg the "roller feed-mechanism,

the main-actuating mechanism-for each? of thesemechanisms, vthe intermediate mechanisms beanism ;V Y

VFigr is aview upon a larger scale ofthe coun ter mechanism and a part of the stop mechanism;

and

.polishing mechanisms which are not-shown in the` x `drawings since such are Well known and form no Zul Fig. 4 is a plan View of the mechanisms shown inl Fig. 2.l

Like numerals-referto like parts throughout` the several views.

In the embodiment of the invention shown in the-drawings, the machine includes a plate-cyl inder ieoi the'usual construction having associated therewith -the usual inking, wiping and part of the present invention.A

Associated with the cylinder ll'is an impresf sion cylinder or D-roll i i of the usual construction, havinga'recessed portion; i2 interrupting the-continuity of the impression surface.

It-is customary, in vmachines of-this type; to impart continuous rotary movement to both cylinders 'le and li, the recess I2 of. the impression cylinder affording an interval during which there canbe noengaging relationwith the portion of the web between the-'impression cylinder or D- roll'and a plate upon the plate cylinder.

Themachine, as shown in the drawings', is for use in printing from a single plate uponA the Yplate cylinder, although thediam'eter of this cylii'nder7 is suciently great to permit the use vof va plurality of plates mounted upon the cylinder and in spaced relation to each other oircumferentially of the cylinder.

Feeding of 'a web in relation to the'printing couple results from the pressing offthe web by the impression cylinder or D-roll against'a plate upon thel plate cylinder. In forming intaglio,

sign thereon, cause feedinglmovernent ofthe web to an extent in excess ofv the amount of feeding movement required for' the. design' impressed elevation of the'plate abo-ve the vsurfaceI or the plate cylinder, limits `thel feeding movement of i the web to that interval duringwhich the blanket upon the cylinder il is Yoperativeiin' relationA tol the plate. Y

Immediately that the plate passes Ythe vertical oenter of the plate cylinder,"'a1l: eedingfmovement of the web cease-aso that the'web'is advanced by a step by step movementl'the amount` the impression or group of impressions `thereon.

Consequently, with each revclutionof the impres-` sion cylinder or D-roll,`tl^lequantity of'web fed willg be suliciently.v great to ordinarily leave an unengraved margin in' advance of, and followingv each impression equalling the length of. the plate in excess of the length of the-groupl or designs thereupon. This spacing of succeeding impressions in relation to each other is undesirable; and in order toV limit the space between succeedingV impressions, or provide-cross spaces-between impression-of a width of cross spaces between paror this advance being determined bythe length ofthe plate as distinguished from/the length of` allell-linesif'of designs engraved upon the plate, a drawbackrmechanism is used which becomes operative, immediately upon the disengagement of ther-impression cylinder cr D-roll from a plate, to'limpart a reverse movement to the web equal to the overfeed thereof, because of the conditions above referred to This overfeed may b-e several inches in length.v

tween a platenA I8 `'and a presser roller i9 which serves as a resistance or tensioning device to keep the web 'taut as it passes to the members of the printing couple.

Between this tensioningdevice and the printing-couple is a guide roller 2G carried by suitable rocker arms 2|, and guiding the web as it is being fedby the members of the printing. couple. ThelarmsZi vcarry stop screws 22 engageable with studs 23 forcontrolling the position. of the guide roller 26. members of' theprinting couple is a guide bar 2li for directing the run of a web following the printingoperation. The rod 2Q, which may be termed anvoiftake guide is positioned below the plane of engagement of the impression cylinder or D-roll withfa plate upon the plate cylinder, so that with -the disengagement ci the impression cylinder orD-roll and the plate with the web, thfew-eb will be drawn downward slightly, and rotation .of the impression cylinder may be continued-without any engagement of the blanket thereon with the web. The manner of centro-lling the run-of the web is immaterial yto the present inventionyexcept insofar as the reverse movement or back feed of the web is concerned.

Thefdrawback roller ifi is mounted in iixed bearingslbelow a forked bracket 25 mounted uponthe frame of the machine. This bracket 25 has vertically slidable therein,-bearing blocks 26 for 'the-arbore of Athe upper drawback roller i3. Acting upon the blocks 25 are heavy coiled springs 2l, the upper ends of which have a spring seat blocki-`28 engageable by an adjusting screw 29; carried by a cap plate 3S for the forked bracket v25.

The springs 2l form a part of what may be termeda-clampingmecnanism, the normal functi'o'nfoi these springs being to *force the drawbackfroller I3 toward the other drawback roller I4 so as to clamp the web between these rollers. Saidclampng mechanislA also includes a bell orank'lever 3i mounted adjacent the bracket 25, one'arm of which bracket carries an anti-friction roller 32, and the other arm of which is forked,-` as shown at 33, and engages a collar 34 loosely-mounted upon the arbor of the roller I3. The function of the springs 527 is to engage the drawback rollers with the web, and the function ofi-the lever 3| is to disengage said rollers from theweb.Y

To" impart a reverse movement to the web, it is essential that the rollers i3 and lll receive a partialrotation while they are engaged with the Webland `that these rollers, after the completion of this drawback operation, be returned to their normal position preparatory to the next reverse feeding movement, and while said rollers are dis- Beyond the printing line of the engaged from the web. This feeding mechanism comprises gears 35 and 35 keyed to the shafts of the rollers i3 and l respectively, it not being required that the teeth upon these gears-extend entirely about same because said gears have only an oscillatory movement. Y

The roller feed mechanism comprises a lever 3l keyed to the shaft carrying the roller It. One arm of this lever is acted upon by a spring rod 38,

the turning of the roller to impart a reverse feed to the web being against the tension of the spring of this rod. A return oscillatory movement to the roller i4 while the drawback rollers are disen-` gaged from the web is eifected by the spring rod 38.

Theclamping mechanism and the roller feed mechanism are actuated with a proper timing in relation to the making of the impression by a main actuating mechanism acting in synchro-y nism with the movement of the plate cylinder, power from this main actuating mechanism being rapplied to the clamping mechanism andfto the is only one rise and fall upon each cam 35 or 40,

the length of the fall or low point of the cam 39, and the length ofthe rise or high point of the cam i5 being substantially conicident with 'the' length of the recess l2 of the impression cylinder j or D-roll.

The cam 35 acts upon a rocking member li pivoted at t2, the extent of the oscillatory movement of this member being controlledby an adjustment screw 53 carried thereby and engageable with a stud tl, thisk adjustmentv screw and stud controlling the quantity of movement of the roller i3 by the spring 2l.V

The member `il of the main actuating mechanism is operative upon the clamping mechanism I through an intermediate mechanism consisting of a stnrup plate i5 pivoted at i5 toV the memberr il and having a bearing surface or stirrup lill The plate engaging the anti-friction roller 32. i5 carries a stop arm '58 engageable with a stop pin G9. A link 555 has one end pivotally connected with the stirrup plate 35, and the other end thereof pivotally connected with a crank 5i acted upon by a, spring rod 52 resisting movement of the stirrup plate by the main actuating mechanismk operative thereon, and permitting slight oscillatory movement of the stirrup plate while preventingrits disengagement from the anti-friction roller 35. Said spring also assists in maintaining an anti-friction roller 53, carried by the member Si l in operative relation to the cam 39 acting upon; said member iii.

The cam lil acts upon a rocking lever 55 forming a part of the main actuating mechanism Voperative upon the roller feed mechanism, this rocking lever having an anti-friction roller 55 engageable by said cam, and having pivoted thereto Vone end of a link 55 through which power kis transmitted to' said roller feed mechanism through an intermediate mechanism which will now ybe described This intermediate mechanism comprises a rockcarrying a lead screw Sii extending longitudinally A ofV the` lever arm. This lead screw co-operates with the screw threads in a block 6| slidably mounted in the slot of the longfarm of the lever A link 62 is pivotally connected with the block 6l and with one arm of the lever 31. f

By adjusting the block 6l radially of the arm of the lever 5.? the quantity of feeding movement imparted to the roller lll may be controlled with absolute accuracy, the length of said feed screw and the length of the slot in the lever arm being suflicient to bring the axis of the pivotal connection between the link 62 and the block Blinto alignment with the pivot 58 of the lever 51 so as to impart no movement whatever to said rollers, if desired.

Ordinarily, an engraved, intaglio orundersurface printing plate Vfor use upon the machine, has reproduced thereon 400 stamp designs, spaced longitudinally and laterally of the plate to provide lengthwise land cross spaces forming the plain margins about each stamp, the perforations being positioned in these marginal spaces. As heretofore stated, the designs arecin Vtwenty rows of twenty stamps each, and when it is desired to deliver stamps in rolls of 500,:it is desirable to have a wide blank space at each end of the roll of stamps, this wide space being o-f a lengthv not to intefere with the operation of the perforating-machine upon a strip of the printed web. c

To permit the production of stamps for delivery in rolls as referred to, it is necessary that the web receive Ya reversefeed by the drawback mechanism following the making of twenty-four succeeding impressions; that the drawback mechanism be made inoperative to impart a reverse feed to the web following the making' of the twenty-fifth impression, and that during the making of the next twenty-four impressions, it

be allowed to impart a reverse feed to theV web.y

In `this manner, twenty rows of 500 stamps, having equal cross spaces between therstamps, are

printed upon the web, there being a wide cross space following the last of the 500 stamps. Subrows of 500 stamps have been impressed, I provide what may be termed a counter mecha- `nism, although this mechanism does not have 65 driven by bevel gearing iii throughwa gear The c lutch members 10 and 1I are engaged `with each other by. a spring 12 acting between vthememberf 'II a r1d a col1ar 13 carried by the bevel gear sha ft.

.'Ifhev purpose of this clutch mechanism will bemore fullydescribed hereinafter in connection with the operationof the stop mechanisms of the machine.

JThe tappet 64 is detachably, connected with the dial 63 so as to permit the counter mechanism=,to Abe made inoperative when it is not desired to separate the impressions made upon the web into rows of A500 stamps.

Pivotallymounted upon the stud; all is a stop lever 14g adapted to be interposed in the path `of vmovementV of one `arm of the lever 3| while said ,lever is sopositioned as. to disengage the drawbackrollers .|3 and Ill from Ythe web, thus p reventing movementof -theroller I3 by the spring f21,t clampitheweblbetween said rollers I3 and III. :This levenlll has p ivotally connected there- .with,V anactuating link 15 having adjustably mounted thereon; a" block: 1l` positioned inA the path of movement of the tappet:V 64, so that following. a given number ofimpulses'of the sh-aft 63a, said tappet 6l!` will engage the Vblock 15, lift '.thev link .15.and. so position the lever 'I4 as to prevent vthe lactuation of the-drawback mechanism, notwithstanding that, all other parts of .said drawback ,mechanismz and said clamp mechanism operate-intheusual manner. Upon the completioniof the cycle of operations necessary to the., makingof .one impression, said tapypet willp'ass .from..engagement with, said block and permit movement. of the lever 14 out of `the path of .movement of the lever 3I, and thenormal functioning .of the drawback mechanism.

The gear trairi.68,fthe` bevel gears 61, the worm shaft 66 and the worm gear 65 are so4 designed,

:in the form of the, invention shown, as toturn the shaftA 83a in aratio of one to twenty-five. as comparedwith theplate cylinder. By this construction, lthe shaft;.63a. receives one twentyfifth of a.'revolutionl during the making of Veach impression.

In printing machines of the type to which the invention relates, a throwoff mechanism is provided which is used to interrupt the making of impressions, by separating fthe cylinders II!Y and II. ThisY mechanismwhich is old and well known, isso constructed that it becomes operative upon :the Ycylindersonly upon the compleftion of the making of an impression from a plate, AFollowing the separation of the-cylinders, ythey both continue to rotate in'the usual manner and all other` mechanisms in the machinev alsocontinue lto operate. The sole effect of this `old throwoff Ymechanism-.is to interrupt the making Aof impressions, andithe feeding of theweb, by

the members of the printingcouple. It is obvious that if Athe -drawbackmechanism were allowed to act to effect a reverse feed to the web,

while themembers ofthe printing couple are inoperative, whenwork'was resumed there would be an overlapping ,of impressions upon the web.

-It is also obvious Ithat underthis condition, if

the counter mechanism were to continue to operate in its usual manner, the drawback-mechanism would be made inoperative by the counter lmechanism before` the full number of impressions desired in a lgroup were made upon the web.

To prevent -thegdevelopment ofLtheV above condition, I provide means acting upon the main actuating mechanism operative upon the clamping mechanism,.and means for simultaneously releasing the c lutch mechanism connecting .the

-worm shaft 66 with the bevel gearing 61 to make said main actuating mechanisminoperative upon `the` intermediate mechanisms acting upon the clamping mechanism, and the counter mechanism inoperative s o long as the cylinders II) an-d II re- .main separated, or the main throwoif mechanism of the machine remains operative toulprevent `the making of impressions.

Said bolt is mountedin abearing` 19 and hasva `stern 8i] havingslidably mounted thereon a stud block 8I acted upon by a spring 82 no rmally biasing the bolt toward the link 56. Said spring acts against a spring seat 83 `carried by a bearing block 8ll onA the stem 80. Said stem also carriesa weight 85.

The counter stop mechanism consists of a cam 8B carried by rthe lastV gear of the trainnl, which cam has a single rise 81 acting upon a forked lever 88-pivota1ly connected with a link 89A carrying a block 90. Mounted adjacent the clutch member 1Iis a lever, one arm SI of which is forked andstraoldles a groove- 92 in said clutch member 1 I and the other arm 93 of which carries an impact member 94 adapted tobe engaged by a block 90 with the actuation of the counter stop mechanism. Since the drawback stop mechanism and the fcounter stop mechanism must be actuated simultaneously with the separation of Athe cylinders I0 and II, I employ the same actuating mechanism for each of. said stop mechanisms and connect this actuatingmechanismwith the throwoif mechanism so as tosecure accuracy in the timing of the operative moment Aof all three mechanisms.

This actuatingmechanism consists of a three armed lever 95, one arm of which is connected by a link 96 with thelink 89, another arm 91 of which is forked and engages studs upon the stud block 8l and the third arm `98 of which is connected by a link SB with one arm IDI) of an oscillatory plate, the other arm IDI of whichis connected by a link |02 with the throwol mechanism of the machine. The` three arm leveris pivoted at |03; the link 96 is pivoted to the arm 95 and to the link 89, and the link 99 is pivoted to the arms 98 and |00.

The drawback rollers I3 and I4 have `rubber blankets or other friction surfaces about same.

f :The run of the web through the machine-.is indicated in'dot and dash lines, as shown at The single plate uponthe plate cylinder is Ain dicated at P.

VAll of the mechanismsherein described are -for controlling the run of the web for the purposes from its roll and the end` thereof passedabout -the guide rollers I5, I6 and I1, b'etweenthe tensioning roller I9 and the platen I8; below the guide roller 20; between the cylinders III and I I, and about'the oftake guide rod 2l!` to a rewind Vmechanism notshown in the drawings, oru to any other mechanism for collecting the web or Sheets `into which it may be cut.

When threading the webthrough the machine, the recess I2 is positioned as shownin Fig. 1, therdrawback rollers I3 and I4 being separated manually or, if desired, power may be applied to the machine so that it is merely necessary to in- Vbe engaged by the blanket upon the impression cylinder or D-roll II. l Substantially simultaneously With, or prior to, the gripping of the web between the plate P and the impression cylinder, the rise of the cam 39 engages the antifriction roller 53 rocking the member 4I about its pivot 42 and thrusts the plate 45 of the intermediate mechanism acting upon the clamping mechanism, toward the lever 3l in a Ymanner to rock said lever so as to raise the bearing blocks 2,3 against the tension of the springs 21 and separate the rollers I3 and I4. This permits a free run of the paper web W as it is drawn forward by the plate P and the blanket of the impression cylinder or D-roll I I. The only restraint'upon the run of the web while the impression is being made is the tensioning resistance to its movement by the action ofthe presser roller I9 and the platen I8 as it passes between these parts.

The movement of the lever 3| is merely suicient to relieve any clamping action upon the web by the drawback rollers I3 and I4.

With movement of the plate 45 to rock the lever 3l, the springs 21 are placed under tension as VLimitation of pivotal movement of the plate 45 also results from the engagement of the stop pin 49 with the stop arm 48.A

With the position of parts shown in the drawings, the drawback rollers I3 andV I4 are in the position reached following the completion of the reverse feed back or drawback of the web.

Substantially simultaneously with the separation of the drawback rollers I3 and I4, the roller 55 carried by the lever 54 passes from the rise 48 of the cam, thus permitting the spring rod38, the spring of which has been tensioned during the preceding feeding movement of the rollers by the lever 51, to impart a return'movernent to the lever 31 and through the link 62 lever 51 and link 56l to the lever 54, causing the roller 55 to follow the cam 40, and at the same time, positioning each of the rollers I3 and I4 preparatory to the' next drawbackoperation;

faoaaeas ment, but substantially imnfediatelythereafter, the lever 54 is oscillatedby a riseV of the'cam 40, thus rocking the lever 51T through the link 56 and the lever 31through the link'62 against the tension of the spring rod 38 to impart a contraclockwise movement tothe roller I4 and, through the segmental gears 35 and 36a clockwise movement to the roller I3. Since the web W is clamped between these rollers, this turning or oscillation thereof will impart a reverse feed to the web W while the impression cylinder or D-roll II isdisengaged therefrom and the rollers I3'and I 4Aare clamped thereupon. Y f

As heretofore stated, this reverse movement, back feed or drawback ofthe web must not only be accurately timed inV relation to the printing interval, but must be so vcontrolled as to impart an exact quantity ofvreverse movement to the web, since variation or error of ai few thousandths of an inch will, by accumulation duringa days run of a press, result in variations in cross spaces between succeeding impressions on the webtoy an extent *to not only interfere vwith the subsequent proper functioning of a perforating'machine, but to cause overlapping of stamp designs upon the web or otlflervviseV imperfect work bythe machine.

The extent of oscillatory movement of Vthe lever may be used upon the machine. The adjustmentV afforded by the lead screw 30 is for the purpose of determiningthe amount of reverse feedof the feed back or drawback off the web with each printing cycle. 1 t 1 J The. turning of the rollers I3 and I4 by the lever 31 to impart a reverse movement of the web, is against the tension of the spring rod 38. With the operation of the clamping and vdrawback mechanisms as heretofore described, the following is the sequence of operations during each printing cycle, or each revolution of the impression cylinder or D-rollV II while'making an impression. i

The main actuating mechanism acting` upon,Y

the clamping mechanismfthrough the intermediate mechanism,is actuated immediately prior to, or substantially simultaneously with, the engagement of theY web between the impression cylinder or D-rolly II and the plate Piu'ponthe plate cylinder AVII), to separate the rollers I 3'and By adjusting ,Y

I4 and to permit a free run of the web asit is drawn forward with the rotation of the Y`impression cylinder or D-roll andthe plate cylinder. This condition continues so long as the impression cylinder or D-roll is engaging the webor the web is engaging a plate. Immediately that the impression cylinder orA D-roll,for they web, passes out of such engagement, said main actuating mechanism becomes operative to rimpart movement of the drawback Yrollers I3 and Msc as to clamp the web between these rollers while Ythe rollers are stationary, thus effectively arresting movement of the web.

Immediately following the clamping of theY` web Y Vbetween the rollers I3 and I4, the main drawbackV actuating mechanism including the lever- 54, ac-

-lever 31 through the `intermediate.mechanism fin- ]eluding the lever.: 51, turning,;the -roller i4 Yin a 1in the mechanism intermediate same zing, cycle. -in the drawings, this cycle includes the making of an impression lfromV one` plate only upon the direction opposite to themovement of the; plate 'cylinder lil, and the drawback roller .I3 in a-diyrectionpoppositeto that of the impression lcylinder lorD-roll, thus imparting a reverse movement to the web to an extent determined by the radius at which theleverx'i acts upon the link e2. The

extent of the reverse movement or drawback ofl the web is determined solelyby the, quantity of -movement ofthe lever 31 by ,thelever 5l andas Vstated, thisquantity 4or movementmay be vaplate cylinder. When more thanone plate is usedupon this cylinder, the mode of operation will be. the same as to each plate, the only change required beingmodication ,of the cam structure 39;and .40soasto oscillate the lever 5l once -for each plate upon `the plate cylinder lil `If it be desired to make an indefinite number lof succeeding impressions with th-e same space between all impressions, the tappet Gisremoved from-the dial 63 of the counter mechanism, ,thus

makingxthis counter mechanism inoperative.

Whenit is desired,.however, to produce rolls of `stamps, the tappet i4V is mounted upon the dial 63 and this dial is. so set as to position the tappetimmediately beyond the block 16 carried by the actuating link 15 for the stop lever 14. The speed ratio between the dial 63 and the plate cylinder lll being one to twenty-live, it is obvious that said dial will receive one-twenty-fth of a revolution with each full revolution of said plate cylinder. Consequently, the tappet 64 will be slowly and progressively advanced so that upon the initiation of the twenty-fifth consecutive impression, the tappet 64 will engage the underface of the block 16 and, by the completion of the twenty-fifth impression, raise the actuating link 15 and stop lever 14 so as to position the latter in the path of movement of a part of the lever 3l, so that with the succeeding actuation of the member 4| bythe spring 52 alone, movement of the lever 3l by the Vsprings 21 is prevented. When the stop lever 14 is thus engaged with the lever 3l of the clamping mechanism, the rollers I3 and i4 are held outof engagement with the web during that interval when, with a normal functioning of the machine, they would be closed upon the web and the web would be given a short reverse movement thereby. While with the movement of the member 4l under the conditions described, there will be nofclamping movement of the rollers I3 and I4, these rollers will nevertheless be reciprocated by the roller feed mechanism yactuated by the lever 5l, but without any eiect upon the movements of the web.

YAs a result, there is no reverse movement of the web following the twenty-fth impression, although upon the succeeding impression, the Ytappet 64 passes out of engagement with the block 16 upon the actuating link 15, and the stop lever 14 moves out ofthe path of movement..-of the v clamp lever 3 i. At this instant, said lever may be AVengaged by the stirrup plate 45.

The stop lever 14 is actuated following the making of the twenty-fourth impression and during the making of the twenty-fifth impression, becoming fully operative upon the completion of the making of this impression. Said stop lever 14 is operative only upon every twenty-fth revolution 'of the plate cylinder, when, as in the machine shown in the drawings, a 40G-on plate is used and it is desired to furnish rolls of 500 stamps.

l The actuation of the printing couple throwo `mechanism is well known in rotary steel plate Yundersurface printing machines of all kinds. The

mechanisms heretofore described in connection with the counter stop mechanism and drawback stop mechanism have no operative effect upon the throwoif mechanism in its action upon the members of theprinting couple. These mechanisms are merely actuated in synchronism with the action of said throwoff mechanism, being connected therewith by the link m2 andthe lever i60-SUI for .the purpose of a proper timing of the actuation of the throwoff. and the other stop mecha- Vnisms.

When the throwoff mechanism is actuated, the link lllimparts a downward thrust to the lever arm IBI, thus exerting a pull to the right, Fig. 2, by the lever arm |80 upon the link Se. Through thislink, the three armed lever 95 is rocked upon vits-' 'axis 93, permitting movement of the stud block 8E by the spring 82 downwardly while the bolt 'l is engaged with the end of the link 56 beyond the socket 18. The weight .85 ensures the .completion of the movement of the bolt 'i1 when the socket 18 is positioned below the bolt. Lifting of the bolt to disengage it from the socket 18 is against the tension of the spring 82.

With the rocking of said lever 95 as described, the link 96 will be raised to lift the link89 of the counter stop mechanism, this occurringwhile the forked. lever 88 is engaged with a low po-int of the cam 81. This raising of the link 89 brings the block 90 into a position where, with the rocking of the lever 88, it may engage the impact member S4 upon the arm 93 of the rocking lever, the forked arm 9i of which engages the slot 92 ofthe clutch member 1I. With movement of the link 89, the vclutch member 1l is disengaged from the clutch member 10, thus permitting the continued opera- 1 -tion of the gear train 68 and the bevel gears 61 `without imparting any rotary movement to the shaft 63a.

The drawback stop mechanism, upon the completion of any printing cycle following the actuation of the throwo mechanism, is made inoperative by holding the roller 55. out of engagement' with the cam 46 because of the engagement of uthe bolt l1 with the socket 18. Likewise, upon the completion of any printing cyclefollowing the actuation of the throwoi mechanism, the'actuating means, for the dial 63 and tappet 64 is made inoperative upon the completion of the printing cycle.

After the actuation of the. throwoif mechanism, the printing couple may continue to operate indefinitely and the drawback rollersl 3 and i4 may be repeatedly moved into and out of engagement with-the web, but during this interval, there will be 11o-feeding of the web by the printing couple the consecutive operations of the press, as'dened by the counter mechanism, and without any variation in that position of the web necessary to a proper spacing of succeeding impressions.

It will beY noted that while the throwoff mechanism of a rotary steel plate press may be manually actuated at any time, this vmanual actuation results merely in the setting of parts, which parts become operative to separate the members of the printing couple only upon the completionof a printing operation or cycle. i

The drawback roller gears 35 and 36 and the clamp lever 3l are duplicated. upon opposite sides of the machine, it being unnecessary to duplicate the main actuating mechanisms and the intermediate mechanisms. The duplicated clamp levers 3l are carried by a shaft extending from side to side of the machine, so that these levers will move in unis-on and ensure a right line movement of the roller i3.

The construction of the various parts herein described is subject to various reiinements, but such are not essential to the invention and are therefore not described in detail.

It is not my intention to limit the invention to the precise details of construction shown in the drawings, it being apparent that such may be varied without departing from the spirit and scope of the invention. t

Having described the invention, what I claim as new and desire to have protected by Letters Patent, is:-

1. A rotary web undersurface printing machine embodying therein, in combination with an inipr'ession cylinder and a plate cylinder adapted to receive an engraved steel plate, or a pair of drawback rollers between which the paper web runs, a clamping mechanism ope-rative to cause said rollers to be alternately engaged with, and disengaged from, a web, a roller feed mechanism operative to oscillate said rollers, main actuating means acting in synchronism with the movement of the plate cylinder, an intermediate mechanism acted upon by said main actuating means and operative upon said clamping mechanism to cause disengagement of said rollers from a web during the making of an impression, and to cause the engagement of said rollers with a web following the making of an impression, and an intermediate mechanism acted upon by said main actuat- K ing means and operative upon said roller feed mechanism to turn said rollers while engaged with a web in one direction to impart a reverse movement to a web, and in the opposite direction while said rollers are disengaged from a web.

2. A rotary web undersurface printing machine embodying therein, in combination with an impression cylinder anda plate cylinder adapted to receive an engraved steel plate, of a-pair of drawback rollers between which the paper web runs, a' clamping mechanism operative to cause said rollers to be alternately engaged with, and disengaged from, a web, a roller i'eed mechanism operative to oscillate said rollers, main actuating means acting in synchronism with the movement of the plate cylinder', an intermediate mechanism acted upon by said main actuating means and operative upon said clamping mechanism t'o cause disengagement of said rollers from a web` during themaking of an impression, and Vto cause Lthe engagement of said rollers with a web following the making of an impression, an intermediate mechanism acted upon by said main actuating means and operative upon said roller feed mechanism to turn said rollers while engaged with Ya web in one direction to impart a reverse movement to a web, and in the opposite direction while' clamping mechanism operative to cause said roll- 15 ers to be alternately engaged with, and disengaged from, a web, a roller feed mechanism operative to oscillate said rollers, main actuating means acting in synchronism with the movement of the plate cylinder, an intermediate mechanism acted upon 20 by said main actuating means and operative upon said clamping mechanism to cause disengagement of said rollers from a web during the making of an impression, and to cause the engagement of said rollers with a web following' the making of '25 an impression, an. intermediate mechanism acted upon by said main actuating'means and 'operative upon said roller feed mechanism ,to turn said'` rollers while engaged with a web 'in' one direc-- tion to impart aV reverse Vmovement to a web, and in the opposite direction while said rollers are disengaged from a web, a counterrrmechanism including therein means operative upon said clamping mechanism to make said drawback mechay,

nism inoperative at predetermined intervals,

means whereby said counter mechanism maybe made inoperative in relation to said clamping mechanism, and speed reducing gearing between said counter mechanism land said plate cylinder;V

Ll. A rotary web undersuriace printing machine embodying therein, in combination with an impression cylinder and a plate cylinder adapted to receive an engraved steel plate, of a' pairk ofY drawback rollers between-which the paper-web runs, a clamping mechanism operative to cause said rollers to be alternately engaged Ywitlnand disengagedrfrom, a web, a roller feedY mechanism operative to oscillate said'rollers, mainV actuating means acting in synchronism with'the movement of the plate cylinder, an intermediate mechanism acted upon by said main actuating means and operative upon'saidv clamping mechanism to cause disengagement of said rollers from a web during the making of an impression,V 'and to cause the engagement of Vsaid'rollers with aweb following' the making of an impression, an intermediate mechanism acted upon by said KAmain actuating means and operative upon'said roller'feed mechanism to turn said rollers" while engaged'with a web in one directionv to impart a reverse vmovement to Va web, andfin-the opposite direction. while said rollers are disengaged `from aweb, a drawback stop mechanism including therein means adapted' to' make said Ymain actuating means inoperative upon said rollerrfeed mechanism, and means connecting same with the throw-k off mechanism of the machine, whereby .said drawback mechanism is made'V inoperative simultaneously with the actuation of the throwoi mechanism. v 1

5. A rotary web undersurface printing machine embodying therein, in combination with an impression cylinder and a plate cylinderadapted to receive an engraved steel-plate, of a pair of drawback rollers between whichthe paper-webf runs, a `clamping mechanism operativeto `cause said rollers to be alternately engaged with, and disengaged from, a web, a roller feed mechanism operative to oscillate said rollers, main actuating means acting in synchronism with the movement of theplateV cylinder, an intermediatemechanism acted upon by said main actuating means and operative upon said clamping mechanism to cause disengagement of said rollers from a web during the making of an` impression, and to cause the engagement of said rollers with a web following the making of an impression, an intermediate mechanism acted upon by -said main actuating means and operative upon said roller feed mechanism 'to turn said rollers while engaged with a web in one direction to impart a reverse movement to a web, and in the opposite direction while said rollers are disengagedfrom a web, a draw.- back stop mechanism including therein means adapted to make the main actuating means inoperative upon said Vroller feed mechanism, a counter mechanism including therein means operative vupon said clamping Vmechanism 'to4 make said drawbackV mechanism inoperative at predetermined intervals, sp'eed reducing gearing between said counter mechanism and said plate cylinder, a counter stop mechanism adapted to make said counter mechanism inoperative, means simultaneously operative upon said drawback stop, and said counter stop mechanisms, and

Vmeans connecting same with the throwoif mechani'smrof the machine, whereby both stop mechanisms are actuated simultaneously with the actuation of the throwoi mechanism.

6. A rotary'web undersurface printing machine embodying therein, in combination with an impressionV cylinder anda plate cylinder adapted toV receive an engraved steel plate, of a pair of drawback rollers between which .the paper web runs, 'one'of said rollers being mounted for -movement toward and from Ythe other, springs acting thereon to clamp theweb between said rollers, a bell crank lever, one arm of which is operative adjacent an end of said movable roller to dis- Vengage it from the web, a roller feed mechanism operative to voscillate said rollers, main actuating means'ajcting in synchronism with the movement of the-plate cylinder, an intermediate mechanism acted upon by said main actuating means and operative upon said bell crank lever to cause disengagement'of said rollers from a web against the tension of'said springs duringthe making of an impression, and to cause the engagement of said rollers with a web following themaking of an impression, and an intermediate mecha- -menttoward and from the other, springs acting thereon tolclamp the web between said rollers, a bell crank lever, one arm oi'whichis operative 4adjacent an 4end of said' movable roller to disengage it'from the web, a roller feed mechanism 'operative to oscillate saidrollers, Vmain actuating means 'acting in synchronism with the movement of nthe platecylinder, a strrup plate engaging one arm of said-bell crank lever acted upon by said main actuating means to cause disengagement of said rollers from a web against the tensionV of said springs during the making of an impression, and to cause the engagement of said rollers with a web following the making of an impression, and an intermediate mechanism acted upon by said main actuating means and operative upon Ysaid roller feed mechanism to turn said rollers while engaged with aweb in one direction to impart areverse movement to a web, and in the `opposite-direction while said rollers are disengaged fro-m a web.

8. A rotary web undersurface printing machine embodying therein, in combination with an i impression cylinder and a plate cylinder adapted to receivean engraved steel plate, of a pair of drawback rollers between which the paper webV runs, one ofV said rollers being mounted for movement toward and from the other, springs acting thereon to clamp the `web between said rollers, a bell crank lever, one arm of which is operative adjacent an end of said movable roller to disengage it fromthe web, a roller feed mechanism operativeV to oscillate said rollers, a'stirrup plate engaging one arm of said bell crank lever, a rocking member pivotally connected with said strrup plate, a crank, a spring acting theeron, a link-connecting said crank and said plate, main actuating means including a cam upon said plate cylinder co-operating with said rocking member, whereby saidrockingvmember, said strrup plate and said bell crank lever are actuated to cause disengagement of said rollers from a web during the making of anvimpression, and to cause the engagement of said rollers with a web following the making of an impression, a mechanism acting in synchronism with the movement `of the plate cylinder for operating said roller feed mechanism, and an intermediate mechanism acted upon by said last named mechanism and operative upon said roller feed mechanism to turn said rollers -while engaged with a web in one direction to impart a reverse movement to a web, and in the opposite direction while said rollers are disengaged from a web.

9; A rotary web undersurface printing machine embodying therein, inV combination with an ini-- pression cylinder and a plate cylinder adapted to receive an engraved steel plate, of a pair of drawback rollers :between which the paper web runs, gears connecting said rollers, a clamping mechanism operative to cause said rollers to be alternately engaged with; and disengaged-from, a web, a lever carried by one of said rollers, a spring acting on one arm of said lever, main actuating means acting in synchronism with the movement of the plate cylinder,an intermediate mechanism acted upon by said main actuating means and operative upon said clamping mechanism to cause disengagementof said rollers from a web during the making of an impressiom'and to cause the engagement of said rollerswith a web following the making of an impression, and an intermediate mechanism acted upon by said main actuating Imeans and operative upon the other arm of said lever to turn said rollers while engaged with a web in one direction to impart a reverse move- 'ment'to a web, and in the opposite-direction while said rollersare disengaged from a web.

' 10. A rotary web undersurface printing machine embodying therein, in combination with an impression cylinder and a plate cylinder adapted to receive an engraved steel plate, of a pair or",l drawback rollers betweenwhich the'pape'r web Yruns,, 'gears`7connecting said rollers, a clamping mechanismroperative to cause said rollers to be alternately engaged with, and disengaged from, a web, a lever carried by one of saidvrollers, a spring actingfonone arm of saidV lever,y means operative in synchronism with-the movement of the plate cylinder and operative upon said clamping mechanism to cause disengagement .of said rollers from a web duringthe making of an impression, and-tol cause the engagement oi said rollers with a web 'following the making of an impression, a rocking lever, a cam upon the: plate cylinderacting thereona second rocking lever,

chine embodying therein,'in`v combination with an impression cylinder and a plate cylinder adapted to receive an engraved steel plate,'of a. pair of drawback rollers between -which'the paper web n runs,` gears connecting said rollers, a clamping mechanismfoperative to cause said rollers to be alternately engaged with,and disengaged from, a-

web, av leverk carried b y one 'of said rollers, Va spring acting onone arm of said lever, means operative in'vsynchronism Ywiththe movement of the plateY cylinder and operative upon said clamping mechanism to cause disengagement of said rollers from ra webfduring the making of an impression, and to cause the engagementof said rollers with afwebfollowing "themaking of an impression,

al rocking lever', acam upon the plate cylinder acting'` thereon, a second rocking lever, a link piv' otallycnnected with: said rocking levers, a link pivotally Aconnectedwith said' second rocking lever and theother arm of the lever carried by a drawback'rolle'r; whereby said rollers' are turned while engaged with'a web inv one direction to impart a reverse'movement' to aweb, and-in the opposite direction while said rollers are disengaged from afweb, and means whereby said last lnamed link maybe adjustedlengthwise ofthe rockingY lever withwhich it is pivotally connected yto regulate the turning movement of said rollers.

12. A -rotary web undersurface printing ma-` chine'e'rnbodying therein, in combination with an impression cylinder anda plate cylinder adapted to'receive an'engraved steel plate, of a pair of d'rawback'rollers between which the paper web rims, gears connecting said rollers, a clamping mechanism operative to cause said rollers to be 'alternately engaged with', and disengaged from,

Va web, a lever carried lby oneof said rollers, a spring acting on one arm of *said lever, means operative vin synchronism vwith the movement of the platecylinder and Yoperative upon said clamping mechanism to cause disengagement of said rollers 'threaded blockV s'lidably mounted thereon, a lead Y screw carried by said leverand co-operating with said block, a link'pivotally connected with said rocking levers, and a link pivotally connected with said blockand the other arm of thelever carried by al drawback roller,"whereby said rollers are turned while engaged with a'web in vone direction Y to impart a reverse movement to ajweb, and in the opposite direction while'said'rollers are disengaged froma web. f l v v 13. A rotaryweb undersurface 'printing machine embodying therein, in combination with VanY impression cylinder and a plate Vcylinder adapted to receive an engraved Ysteel plate, of a pairY of` drawback rollers between which the paper web runs, one of said rollers being mounted for move-,-y l ment toward and from the other, springs'facting thereon to clamp lthe web between .said rollers,"

bell crank levers, one arm of which isoperative to disengage said movablevroller from'the web,V a' roller Vfeed mechanism .operative to oscillate said4 rollers, main actuating means actingV insynchronism with the movement ofntherplat'e cyl- Yfollowing the making of an impression', an intere5:

mediate mechanism acted upon by Vmain actuating means and operative upon said roller. feed mechanism to turn said rollers whileen'- gaged with a web Yin one directionrrto impart a reverse movement Vto a web, and inthe opposite direction while said rollers are disengaged from a web, a counter mechanism including. therein means 'operative upon said clamping mechanism Y to make said drawback mechanism inoperative at predetermined intervals, and speed reducing gearing: between 'said counter mechanism and said! plate cylinder.' Y `f Y Y 14. A rotary web 'undersurface printing machine embodying therein, in combination with an impression cylinder and a plate cylinder adapted I to receive an engraved' steel plate, of a pair of runs, gears connecting'y said rol1ers,-a clamping mechanism operative to cause said rollers Yto be alternatelyengag'ed with, and disengaged from, a web,'a lever V,carried by one of said rollers, a-

spring acting on one arm of said lever,y means operative in synchronism withgthe movement of the plate cylinder and operative uponv said clamping mechanism to cause disengagement of said rollers from a web duringfthe making of anim',-k

pression, and to cause the engagement` of said rollers with a web following the making of an impression, a rocking lever, aV camgupon the plate cylinder acting thereon,'a second rocking lever,

va link pivotally connected'with'said rocking leried by a drawback roller, whereby said'rollers are Y K turned while engaged with a web in one direction toimpart a reverse movement'to a web, and in the opposite direction while said rollers are disengaged from a web,.a drawbackfstop mechanism including therein a bolt, said link connecting said rockingY levers having a socketvadaptedV to receive same, means biasing said ,bolt towards said link, a leveroperative uponsaid boltfand conf 5 nections between said lever vand the throwoilV mechanism of the machine, whereby said rocking levers are held against movement simultaneously with the actuation of the throwoir mechanism; 15. A rotary web undersurface .printing fnachine embodying therein, in combination Ywith an impression cylinder and a plate cylinder' adapted to receive an engraved steel plate, of apair-of drawback rollers between which the paper Vweb 1 40 drawback rollers between which the'paperweb Y runs, one of said rollers being mounted for movement toward and from the other, springs acting thereon'to clamp the ,web between said rollers, bell crank levers, one armof which is operative to disengage said movable roller from the web, a roller feed mechanism operative to oscillate said rollers, main actuating means acting in synchronism with the movement of the plate cylinder, an intermediate mechanism acted upon by said main actuating means and operative upon said bell crank levers to cause disengagement of said rollers from a web against the tension of said springs during the making of an impression, and to cause the engagement of said rollers with a web following the making of an impression, an intermediate mechanism'acted upon by said main actuating means and operative upon said roller feed mechanism to turn said rollers while engaged with a web in one direction to impart a, reverse movement to a web, and in the opposite direction while said Vrollers are disengaged from a web, a stop lever-'mounted adjacent said bell crank levers, an actuating link therefor, a block carried by said link, a rotatable shaft, a tappet carried thereby engageable with said block, and a speed reducing gearing between said shaft and the plate cylinder, whereby movement of said bell crank levers is prevented at predetermined intervals.

16. A rotary web undersurface printing machine embodying therein, in combination with an impression cylinder and a plate cylinder adapted to receive an engraved steel plate, of a pair of drawback rollers between which the paper web runs, one of said rollers being mounted for movement toward and from the other, springs acting thereon to clamp the web between said rollers,

' bell `crank levers, one arm of which is operative to disengage said movable roller from the web, a roller feed mechanism operative to oscillate said rollers, main actuating means acting in synchronism with the movement of the plate cylinder, an intermediate mechanism acted upon by said main actuating means and operative upon a web, a stop lever mounted adjacent said bell crank levers, an actuating link therefor, a block carried by said link, a rotatable shaft, a tappet removably mounted upon said shaft and engageable with said block, and a speed reducing gearing between said shaft and the plate cylinder, whereby movement of said bell crank levers is prevented at predetermined intervals.

17. A rotary web undersurface printing machine embodying therein, in combination with an impression cylinder and a plate cylinder adapted to receive an engraved steel plate, of a pair of drawback rollers between which the paper web runs, a clamping mechanism operative to cause said rollers to be alternately engaged with, and disengaged from, a web, a roller feed mechanism operative to oscillate said rollers, main actuating means acting in synchronism with the movement of the plate cylinder, an intermediate mechanism acted upon by said main actuating means and operative upon said clamping mechanism to cause disengagement of said rollers from a web during the making of an impression, and to cause the engagement of said rollers with a web following the making of an impression, an intermediate mechanism acted upon by said main actuating means and operative upon said roller feed mechanism to turn said rollers while engaged with a web in one direction to impart a reverse movement to a web, and in the opposite direction while said rollers are disengaged from a web, a drawback stop mechanism including therein means adapted to make the main actuating means inoperative upon said roller feed mechanism, a counter mechanism including therein means operative upon said clamping mechanism to make said drawback mechanism inoperative at predetermined intervals, speed reducing gearing between said counter mechanism and said plate cylinder, clutch members whereby said gearing may be made operative or inoperative, a cam actuated by said gearing, a lever co-operating therewith, a link pivotally connected with said lever, a second lever operative upon said clutch members, an impact member carried thereby, a block carried by said link, means simultaneously operative upon said drawback stop mechanism and upon said link to cause said block to engage said impact member, and means connecting said last named means with the throwoif mechanism of the machine, whereby said drawback and said counter mechanisms will be made inoperative simultaneously with the actuation of the throwoff mechanism.

FRANK CHARLES MARQUARDT.

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