US1482351A

US1482351A - Printing press

Info

Publication number: US1482351A
Application number: US335420A
Authority: US
Inventors: Charles F Dausmann
Original assignee: PRISMATONE CO Inc
Current assignee: PRISMATONE CO Inc
Priority date: 1919-11-03
Filing date: 1919-11-03
Publication date: 1924-01-29
Anticipated expiration: 1941-01-29

Description

Jan. 29, 1924- C. F. DAUSMANN PRINTING PRESS Filed NOV. 5, 1919 Jiang 29 1924.

c. F. DAUSMANN PRINTING PRESS Filed Nob.

3, 1919 4 Sheets-Sheet 2 C. F. DAUSMANN r im.. 29, 1924.

PRINTING PRESS 4 Sheets-Sheet 3 Filed Nov. 13, 1919 N. m .z W O 5 .m e, w v F n f. n@ e @y M RN d R 7U 5C www mw wa 1 1 l 1 l l r l Il m w R m v l.v mm www l ER wh www. 29 y 1924- c, F. DAUSMANN PRINTING PRESS Filed Nov. 3, 1919 4 Sheets-Sheet 4 Zy .CI f? HTTOPNFY Patented JaHMZQ, lgd. A

nani 'I j 'Mr oi CHARLES DAUSMANN, OF BROOKLY', NEW YORK, ASSIGNOR T0 THE IBJISIMIAJII."O1\TA-.El

C0., INC., OF NEW YORK, N. Y., A CORPORATION 0F YORK. l

rRIN'rIixie PRESS.

Application led November 3,`19l. Serial No, 335,42ll.

To all whom t may concern: y

Beitlmown that I, CHARLES F. DAns- MANN, a citizen of the United States, and

-a resident of the borough, of Brookl n, county of Queens, city and State of ew York,'have invented certain new and useful Improvements in Printing Presses, of which the following is a-specification.

The present invention relates to improvements in printing presses, and particularly to presses of the rotary gravure type in j which 'an etched intaglio printing cylinder cooperates with a yieldable impression roller, and between which the sheet. or web of paper is fed. T lie improvements iontemplated herein are especially adapted to use in a press including a plurality of superimposed printing units, through which the paper is fed and printed successively in a plurality of colors. It is obvious that in a press of this type, great accuracy is essential and absolute registration of the cylinders necessary ing of the diii'erent colors upon the paper in exact superimposed relation.

` It'Y is a therefore, to provide means capable of aocurate and positive adjustment of the printing cylinder longitudinally and circumferentially to effect the registration thereof,

a' -such means being convenient andl facile of -mission means disposed betweenthe printing cylinder and the doctor'for effecting its movement o ver the cylinder, to the end that the movement of the doctor will be properly timed to the movement of the cylinder and a4 thorough and even removal to enable the removall of the printing cylliiider with facility, and to this lend I propose Vto provide carriage at each endthereof cooperatively connected together, and which may be moved toward orv away from the impression rollers,.the cylinder in the outer position of the .carriages being free to be re- !ginoved. I further propose to enable the ad-' v justmeiit of the pressure relation between the printing cylinder and the impression rollerl embodiment of my to insurev the proper print.

primary object ofv my invention operation and permitting of adjustment to of the ink r'esults. A further object ofmy invention is and alsobetween the doctor and the N printing cylinder.v

.A still furtherobject is to provide an improved \inl`r='font, the inking roller of which may'be'engaged with and disengaged from the printing cylinder with facility, and may furthen be accurately adjusted as tov sure relation therewith. In general provements enable the accurate and adjustmet` f .the printing cylinder and parts coopera ing therewith with the greatest precisionrand at the same time in a manner as to maintain the adjustment against the effects of'vibration and otherforces set up by the opration of the press.

With these andother objects in view an invention is shown in the accompanying drawings, and this embodimy impositive mentv will'be hereinafter more fully cle-v :scribed'with reference thereto and the invention willbe finally pointed out in the claims.

In the accompanying drawings,

Fig. 1 is a front side elevationlof a press according to the present embodiment of my invention, and showing one printing unit; g Fig. 2 Yis a rear sideelevation thereof;

Fig; '3 is an end .view of the press with parts broken away; I

Fig.- 4 is a view of the printing cylinder and associatedparts partly broken away and with parts in section;

Fig. 5 is a detail plan view of .the driving gear at one end of the printing cylinder shaft; y l Fig. 6 is an end view of the other end of the printing cylinder and showing means for adjusting the same longitudinally;

Fig. 7 is a detail sectional View of a ratchet and pawl mechanism employed, and

Fig. 8 is a side elevational view of aprint- 'ing press showing one embodiment of vmy invention incorporated'therein, certain well known parts of the press being omitted for the sake of clearness.

its pres-l elongated screw 29 upon a corresponding structural formation of the frames. In the drawings I have only shown the portions of the frame supporting one unit, it being understood that the superimposed units are of similar construction.

The frames are respectively provided with horizontal step portions 12 terminating at their inner ends in enlarged rectangular pockets or recesses 13 provided in their lower and upright `sides with adjustable screws 14 and 15 the screws14 support the bearing 'blocks 16 of the printing cylinder 17, the shaft 18 of which rests 1n the'pockets 19 formed in the said blocks, the bearing blocks together with the cylinder adapted to' be.moved into and out of printing position by means presently to'be referred to.

vThe screws 15 serve as abutments to limit the inward movements of the bearings 16.

The'step portions of the side frames are each provided longitudinally with a channel 20 and at their upper sides there is slidably mounted a carriage 21 slightly wi-der than the step portion and provided .with overhanging guide flanges 22 and 23, an upstanding head 24 being provided at the inner end of the carriage and having a vertical slot 25 formedtherein in wlnch is removably engaged a couplinghead or stud 26 upon the bearing block 16, the connection-causing the bearing block to move with the carriage while at the Sametime permitting vertical adjustment thereof.

the under side of the carriage there is provided a projecting block orl nut portion 27 disposed 1n the channel 20 and provided with a threaded passage 28vengaged by an j ournaled at the forward end of the channel in a bearing'plate 30 fixed by bolts 30a across the said forward endbf the channel, the"screw being held against longitudinal movement by shoulders 31 and 32 provided thereon. The shank of the screw extends lforwardly and has xed thereon a ratchet gear 33 engaged by a yspring pressed ratchet tooth or pawl 34 mounted in a'lever arm 35 rotatably supported upon the end of the shank. The` lever at one side of the pressis connected. to the lever at the other -side by means of a bar` 36 pivotally secured at its ends upon studs 37 formed upon the levers, and adapted to impart equal movement from one lever to the other. By giving a to and fro swing- 4ing movement to one of the levers 35, both sciews 29 are simultaneously and equally romovement is thereby given to the carriages. The pawl 34 issuch that it may be withdrawn from engagement with the gear 33 and reversed in position to cause rotation of the screw in either direction. As shown in Fig. 7, its shaft 38 is circular in cross section and reciprocates in a circular passage 39. being provided with a reduced shank having a knob 40 at its ex- Y and provided incassi posed end, a. spring 41 being disposed about the shank within the passage and abutting a shoulder 42 at the lower end of the passage.

Diamctricallyopposite slots 43 and .44 are provided longitudinally in the wall of the. passage in communication atv their lower ends'with an annular slot 45. A pin 46 in the shaft engages either one of the slots 43 and 44 and may be changed tothe other to reverse'the position of the nose of the pawl by may be turned through the annular slot 45. It will be manifest from the foregoing that if both of the pawls are similarly disposed with relation-to the ratchets 34. the screws 29'are`sii'1iultaneously and equally rotated. If, however, one of the pawls is withdrawn fromengagement with the corresponding ratchet or the pawls are disposed in reverse relation, one of the screws 29 may be rotated independently of the other, thus effecting relative adjustment of the ends of the printing cylinder. l

At theupper side of the carriage there vare provided spaced upstanding portions 46 and 447 and a cover plate 48br1dging the said portions 46and 47 and vsecured to their upper'ends, forming a slideway upon the carriage in which is slidably mounted a bearing bloclr 49 slightly wider than the carriage with. overhanging guide flanges 5() and 51. A doctor knife shaft 52 is supported at itsends in the blocks 49 at the respective sides of the press, and is adapted to have reciprocatory movement in respect thereto. rlhe blocks may be adjusted longitudinally of the slideway of the carriage by means of elongated screws 53 swivelled thereto at 54 and engaging threaded passages 53a in the upstanding portion 47.

Upon the shaft 52 there is mounted in spaced relation7 a plurality of blade clamps 55, the end clamps being preferably fixed by pins 55a against rotation on the shaft, while the intermediate ones are loosely mounted between fixed collars 551. The clamps are provided in their forwardly projecting portions with slots 56 in which is secured the doctor blade 57 resting upon the printing cylinder, the blade being held in place by the pressure of a post 58 screwed into the upper side of the clamp, the said post being squared at its upper end as at 59 for engagement of a wrench. The post also serves as a support circular weights 60 mounted uponthe clamp, the pressure produced by the weights being varied depending upon their number. A handle 61 is secured to one of the rigid clamps to facilitate swinging the doctor blade out of engagement with theprinting cylinder. The intermediate clamps being loose` the blade will findl its true engaging position at all points with the cylinder, any deficiency or curvature due to springiness for a plurality of.

rawing the shaft down so that the pin 1,482,35i y m in the blade or bar beingcompensated by the weights causing the entire edge of the blade to rest squarely on the cylinder.

At one en d of the shaft 52 there is mounted a depending-yoke member 62 embracing an elongated-cylindrical eccentric cam 63, the shaft 64 of which is journaled in bearing

brackets

65 and 66 mounted upon the side` of the frame 11, a gear- 67 being provided upon one end of the shaft at the outer side of the bracket 66 which' meshes with a similar gear 68 mounted upon a stud shaft 69 supported upon a bearing 6,6a of Dthebracket 66, a beveledgear 70 being also provided upon the said 'shaft 69 which meshes' with a beveled ear 71 provided upon one end of a shaft l2 journaled in the frame 11, a gear 73 being provided upon the other end of the said shaft which meshes with a substantially wider pinion gear 74 provided upon the shaft 18 of the printing cylinder, the greater width of the gear 74 permitting longitudinal shifting of the printing cylinder as will presently be more fully pointed out, without disengagement of the gears. Rotation of the printing cylinder will through the train of gears, impart rotation to the cam 63 and thereby cause to and fro reciprocating movement of the doctor blade the effect of this being an'even wiping an distribution of the ink upon the cylinder, free from streaks. The elongated cam 63 permits of adjustment of the bearing blocks 49 longitudinally of the carriage, without disturbing the cooperative relation between the cam 63 and the yoke member '62. .Upon

the supports or standards 10 and 1.1 there are rotatably secured by screws 170, locking cams 171 having operating-handles 172 and which are adapted to be moved into engagement with the face 'of the upstanding head 24 to lock the carriage in its movedin position, the screw 170l permitting of adjustment of the locking cam which, for this purpose, is spaced from the face of the side frame as at 173. By suitable adjust ment of the cams 171, the bearin blocks may be clamped rigidly between t e cams and the abutment screws 15. At the forward end of the carriage there is pivotally mounted upon a screw 174, a forked lockin -lever 175 provided with a handle 176 and adapted to be engaged about the'shank of the screw 29 in the moved-in position of the carriage and disengagedwhen it is desired to move the carriage outwardly by operation of the said screw 29.

Below the printing cylinder there is provided an ink fontl 75 having an inking roller 76, the shaft 77 of which is journaled in the

ends

78 and 79, the font being supported upon four arms 80 pivotally connected as at 81 to the fourl corners of the Ifont and fixed upon supporting rock shafts 82 and 83, the shaft 83 being provided at its provThe engagement of the worm and worm gear, it will be noted, acts as a lock to maintain the font in any desired position to which it is moved. When in its lowered position, the font is in such position in front of the press that it may be supplied with ink with facility.

The main drive shaft 88 is disposed horizontally at one side of the press being journaled in a bea-ring 89 secured to the frame 10 and supported in the bearing 90 of a standard 91, rotation being imparted to the drive shaft through a gear 92 mounted thereon and a pinion 93 meshing therewith and driven by a motor or other suitable source of power by the gear wheel 94. Upon the end of the shaft 88 there is provided a beveled pinion 96 meshing with the beveled teeth of a combination spur and beveled gear 97 mountedupon a stud shaft 98 journaled in theframe 10, the spur teeth meshing with and driving a gear 99 mounted upon one end of the shaft 18 ofthe printing cylinder.

Extending upriglitly of the frame 10 and journaled in bearlng brackets 100, there is provided a shaft 101 provided at its lower end with a beveled pinion 102 meshin with the beveled gear teeth of the gear 9 and from which it receives its motion, the shaft 101v in turn imparting motion to' superimposed printing units by means of beveled pinions 103 disposed relatively to the print- 'ing units and which enga-ge the beveled teeth of the combined spur and beveled gears similar to the gear 97, the superimposed' units as' previously pointed out, being similar to` the units herein described; so that, exact synchronismof movement between the several printing units is obtained. The spur gear portion of the gear 97 is substantially wider than the gear 99 sothat longitudinal movement of the printing cylinder may be eft'rcted without disturbing the engaging relation of the gears.

In Figs. 4 and 5 I have shown in detail the construction of the gear 99, which is designed to enable the circumferential adjustvment of the printing cylinder. Upon the reduced end 18a of the shaft 18 there is mounted the hub 104 fixed against rotation relatively to the shaft by means of a'key 105 and set screw 106 and provided with a flange 107 having an annular series of screw threaded holes 108 therein, a shoulder 109 provided between the flange and the hub being provided with a plurality of radial passages 110 adapted to be engaged by a suitable rod to manually 'rotate the printing cylinder.

The toothed peripheral portion 111 of the gear is provided with an'inwardly extending annular flange 112 and is-recessed as at 113 at its rear side, the flange 107 of the hub engaging this recess. Diametrically opposite

arcuate slots

114 and 115 are provided in the flange 112 in registering relation with the screw threaded holes 108 and adapted to receive retaining screws 116 and 117 engaged in two of the said holes 108, the projecting heads of the screws bring provided with radial passages 118 therethrough adapted to be engaged by a rod to tighten the screws and thereby secure the flange 112 of the toothed periphery fixedly to the flange 107 of the hub. At each side of the

slots

114 and 115 there are provided upon the ange 112 block portions 119'in which are adjustably mounted set screws 120 bea-ring upon the screw heads at each side and adapted by relative adjustment to effect minute adjustment of the screws in the

slots

114 and 115. In order to adjust the printing cylinder circumferentially, the screws 116 and 117 are removed and the toothed peripheral portion of the gear being fixed by engagement with the gear 97, rotation of the accurate registration of theY printing cylinder is obtained, and thereupon the screws are tightened into place toisecurely fix the relation of the flanges 107 and 112.

In order to effect the longitudinal adjustment land registration of the printing cylinder, the projectingend of its shaft 18 opposed to the end supporting the gear 99, is provided with an annular groove 121 engaged by the yoke end 122 of an arm 123 provided intermediate its Aends with a hub 124 having a screw threaded passage 125 therethrough engaged by a threaded adjusting shaft 126 journaled at one end in a bearing 127 fixed to the frame 11 and provided at its other end with ahand wheel 128 and which upon being rotated, causes the arm to travel longitudinally of. the shaft and thereby through its `connection with the shaft 18, cause longitudinal movement and adjustment thereof. An apertured enlargement 129 is provided at the free end ofthe arm 123 engaging a guide rod 129a fixed in the frame 11 to prevent swiveling of the arm and 134 and respectively connected to adjusting screws 135 each 'extending through a nut 136 slidable inpassages 137 at each end of the bracket 138 extending between and fixed to the .side arms 10 and 11, the square heads 139 -of the nut engaging the upstanding ends 140 of the bracket fixing it against rotation, Upon the respective ends of parallel shafts 141 and 142 extending between the upstanding ends of the bracket there are provided cams 143 and 144, the square head of the nut being held constantly in engagement with the said cams by means of springs 145 and 146 disposed in sockets 147 and 148 formed in the bracketv above and below the passage 137, the said springs being adjustable as to tension by means of set screws 14511- and 146, Intermeshing pinions 149 a'nd 150 are provided upon the respective shafts 141 and 142, and the lower shaft has mounted thereon an arm 151 which upon being raised, will through the rotationof the shafts 141 and 142, turn the cams 143 and 144 so that the springs 145 and 146 force the nut 136 carrying thescrew 135 outwardly and thereby withdraw the bearings 132 and the impression roller carried thereby out of en agement with the printing cylinder.

he respective arms 151 of the superimposed printing units are connected by rods 152 so thatmovement of one of the armswill cause corresponding movements of the others and the throw-off of the several impression rollers will be simultaneous and equal. The lowermost arm 151 is connected by a4 rod 153 -to an arm -154 provided uponthe shaft 155 of a segment gear 156 which meshes with a pinion -157 provided upon the shaft 158 of a gear 159, a pinion 160 provided upon a shaft 161 mounted in a bracket 161 meshing with the gear 159, a handle 162 being provided upon the shaft 161. By turning the handle 162. the train of gears 160, 159` 157 and 156 -will swing the arm 154 upwardly, causing the arms 151 to be swung and the cams 1.43 and 144 to be turned to release the impression rollers The paper or web passes from between the printing cylinder and the -impression roller over/blankets 163 and thence from the lowermost blanket over a steam drying jacket 164. j l

AThe impression roller .adjusting and releasing mechanism herein described is disclosed and claimed in my copending application Serial No. 315,603, filed August 6, 1919,*and no claim is made herein to the particular mechanism except as to the adjustment and releasing relation between the printing cylinder and the impression roller.

Maasai invention but it is obvious that changes may "be made therein within the spirit and scope thereof as defined in the appended claims; I claim: 1. In a printing press, the combination of a printing cylinder, an impression roll,

means for simultaneously and selectively adjusting the :opposite ends of the prlntmg cylinder relative to the impression roll,

kmeans for adjusting the pressure relation releasing means operable between the printing cylinder and the impression roll, meansl normally tending to` quickly separate the cylinder and roll, and quick acting releasing means operable counte'r to said last means for holding the cylinder and roll together in their adjusted pressure relation and adapted to be operated for releasing said separating means.

2. In a printing press, the combination of a plurality of printing cylinders, an impression roll for each printing cylinder, means for simultaneously and selectively adjusting the opposite ends of each printing cylinder relative to its impressioni roll,A

means for independently adjusting the pressure relation between each printing cylinder and its impression rll, means normally tending to separate vthe printing cylinders from their respective impression rolls, and counter. to said separating means for holding the printing cylinders and impression rolls together in their adjusted pressure relation and adapted to be actuated for releasing said separating means.

3. In a printing press, side frames provided with horizontal shelf portions, bearings slidable upon said shelf portions, a printing cylinder supported in said bearings, an impression roll adapted to engagel said printin cylinder, a carriage provided upon each of shelf portions and respectively connected to said bearings to move the'same therewith, a screw mounted in each, of said frames fixed against longitudinaln movement, means on said carriages engaging said screws to effect movement of said carriages 60 upon turning movement of said screws, and reversible ratchet means upon said screws adapted to turn said screws. t

4. In a printing press, side frame provided with horizontal shelf ortions, Bearings slidable upon said shelf) portions, a printing cylinder supported in said bearings, an impression roll adapted to engage said -printing cylinder, a carriage provided upon each of said shelf ortions and respectively connected .to said) bearings to move the same therewith, a screw mounted in each of said frames fixed against longitudinal movement, means on said carriages engaging said screws to ciiect movement of said carriages upon turning movement of said screws, reversible ratchet means adapted to turn said screws, and upon reversal Vto effect turning movement in one vor the other4 direction to respectively move said carriages in or out.

5. In a printing press, a printing cylinder, an impression roll, carriage means for moving said printing cylinder into and out of engagement with said impression roll a shaft supported by said carriage means disposedparallel to the axis of said printing cylinder, and adapted to have reciprocatin movement, a doctor knife supported thereby,

an elongated cylindrical eccentric cam ar ranged parallel to the longitudinal movement of said carriage, and means on said shaft engaging said cam and adapted to maintain cooperative relation therewith in -any position of movement of said carriage movement of said cam adapted to reciprocate said shaft of said doctor knife.

6. Ina printing press, a printing cylinder, an impression roll, a shaft disposed parallel to said printing cylinder, an elongated doctor blade engaging said cylinder, a plurality of supporting means engaging said blade and loosely mounted on saidshaft in spaced relation, and weighting means mounted upon 4said respective supporting means and adapted to uniformly engage said blade with said cylinder throughout its length.

7, In a printing press, a printing cylinder, an impression roll, a shaft disposed parallel to said cylinder, an elongated doctor blade engaging said cylinder, supporting means engaging said blade at its end portion and rigidly mounted on said shaft, and

g means and adapted to uniformly engage said blade with said length.

8. In a printing press, a plurality of printing' cylinders, a plurality of impression rolls therefor, means for simultaneously and equally moving the ends ofA each of the printing cylinders to adjust the cylinders into and out of engagement with their respective impression rolls, means for simultaneously and equally moving all of the impression rolls toward and from their respective printing cylinders, and means for adjusting the pressure relation between the cylinder throughout its liti@ printing cylinders and their respective rolls. i

9. In a printing press, the combinationof a plurality of printing cylinder and iinpression roll couples, individual means for each couple for independently adjusting the pressure relation between the cylinder 'and roll of each couple, independent means for simultaneously and selectively adjusting the ends ot the printing cylinder of each print-` ing couple into and out of engagement with theirrespective impression rolls, and means for simultaneously and equally moving all of the impression rolls toward and from their respective printing cylinders.

10. Ina printing press having side frames, bearings slidable horizontally on the frames, a printing cylinder mounted in said bearings, an impression roll cooperating with the printing cylinder, a screw mounted in each of said frames and operatively connected to said bearings, an arm associated with each of the screws, like connections between the arms and the screws, each connection comprisingva part movable to disconnect the arm from the screw, and a connection between said arms so that 'when each of the arms is connected to its-respective screw, the screws may be simultaneously and equally adjusted by movement of one of said arms,

whereas, upon movement of one of said parts i to disconnect one of said arms from its respective screw, the other4 of said arms may be moved independently ofthe first mentioned arm so' as to ei'ect relative adjustmentof the ends of the printing cylinderf 11. In a printing. press having side frames, bearings slidable horizontally on the frames, a printing cylinder mounted in thi` bearings, an impression roll associated with the printing cylinder, means Jfor adjusting said bearings to move the printing cylinder toward and from the impression roll, abut- 'ment means for limiting the inward movelment of said bearings, and means movable intooperative relation with the sides of the bearings opposite from the abutment and cooperating with the abutments Ato restrain the bearings rigidly against horizontal movement.

12. In a printing press having side frames, bearings -slidable horizontally on the frames, a printing cylinder mounted in said bearings, an impression roll associated with the said cylinder, means foradjusting said bearings to move the printing cylinder toward and from the impression roll, adjustable abutment screws for limiting the inward movement of said bearings and cams movable into operative relation withy the sides of the bearings opposite from the abutments, said cams being adjustable bodily toward and from said adjustment screws to enable the cams to cooperate with the -screws to restrain the bearings rigidly against horizontal movement.

13. In a printing press having side frames, bearin s slidable horizontally on the frames, a prin ing cylinder mounted in ,said bearings, an impression roll associated with the said cylinder, means for adjusting said bearings to move the` printing cylinder toward and from the impression roll, adjustable abutment screws for limiting thev inward movement of said bearings, cams movable into operative relation with the sides of the bearings opposite from the abutments, said cams being adjustable bodily toward and from said adjustment screws to enable the cams to cooperate with the screws to' restrain the bearings rigidly against horizontal movement, and means for adjustin said bearings vertically while they are liel against horizontal movement by said abutment screws and said cams.v

14. In a press, a plurality of print .and

impression rollers,` manually adjustable fr means for urging the impression rollers out of engagement with the print rollers, means acting vagainst said manually adjustable means for advancing the impression rollers against said print rollers, and' operating means connected to all'of said advancing means to cause all of said advancing means to be operated simultaneously andfequally.

15. In a press, a pluralityuof print and impression rollers, means for normally urging the impression rollers out of engagement with the print rollers, cam devices for advancing the impression rollers against said print rollers and against the'action of said means, means for operatively connectingA said cam devices, and manual operating means for said connecting means and including speed reducing elements, whereby vall vof said cam devices may be operated simultaneously and equally by hand.

16. In a press having print and impression rollers, means for withdrawing-said impression roller from engagement with said print roller comprising an elongated screwrswivelly connected at its inner end `swivelly connected at its inner end to said impression roller, a non-rotatable nut mounted on said screw. a spring bearing against said nut to normally urge the impres- 4to said impression roller, a non-rotatable sion roller away from the print roller, ad-

justment means engaging said nut adapted to move the same inwardly against the tension of the springto engage said impression roller against said print roller, and means on said screw adapted to enable the same to vloe rotated in said nut to independently 5 move said impression roller into and out of engagement with said print ro'ller.

18. In apress, a pluralityofprint and impression rollers,' means for normally urging y the impression rollers out of engagement l0 with the print rollers, cam devices for advanoing" the impression rollers against said print rollers and against the aetion'of said means, means for operatively connecting together all of said cam devices, and independent manual operating means for simultaneously and equally operating all of said Cam devices.

'In testimony that l. claim the foregoing as' my invention, I have signed my name hereunder.

o oHAnLEs F. DU'SMANN. I