Патент USA US2138142код для вставки
Nov. 29, 1938.- P. DIETRICH 2,138,142 PRESSURE ADJUSTING DEVICE Filed April 17, 19:57 Fá'ggj , l'_/„1. ßf www 2,138,142 ' Patented Nov. 29, 1938 PATENT oFF-ica UNITED STATES 2,133.14:v PRESSURE ADJUs'rlNG nevica' Paul Dietrich, Augsburg, Germany, assigner' to . Maschinenfabrik Augsburg-Nürnberg A. G., ' Augsburg, Germany, a corporation «Germany Application April 17, 1937, Serial No.. y187,133 In Germany October .26, 1935 2Claims. (Cl. lill-247) In rotary photogravure machines the'web to be against one of diil'erent diameter. Rigidly 'con printed passes between two cylinders which are nected with the journal I is a two-arm lever Il pressed against each other and of which one, the which by means ofthe two piston rods l2 and I3 of the pneumatic cylinders II and l5 may- be impression cylinder, to adjust the degree of pres sure is moved towards the other cylinder, the turned one way or the other. The action of the l pneumatic cylinders is controlled by two _three form cylinder, or away therefrom. It has hither to been impossible to adjust the degree of pres- - way cocks I6 and I1 which at will establish com munication either with the delivery pipe or the outer air. Pressure >is regulated by means oi’ a- sure accurately enough or, after, a temporary _ alteration thereof to restore the earlier condition l0. because the mechanical means applied to this end lacked precision and were too complicated and unreliable in their action.> Accurate adjustment is however indispensable, for instance in multi reduction valve I’. » 10 .1 In place of the two single-actinghpistons I4 and I5 one double-acting piston maybe used. ~ Thetwo three-way cocks I6 and I'l may also be replaced by one double-acting one. ` l color printing, because proper register of the ' v As represented in lthe drawing the impression l5 cylinder 3 will be brought closer to the form cyl several succeeding impressions can be obtained l only if the tension of the web be kept even, and inder if the piston I4 moves to the right, and re the tension varies with‘the degree of pressure be tween the cylinders. If in machines equipped moved therefrom if the piston I5 is moved to the with any of the _known adjusting devices the web -right. Since the intermediary roll 2 is pressed U during the run accidentally breaks, the machine against the impression cylinder by a spring 20, 20 is liable to get unduly strained and damaged also disposed within the slidable frame 6, it will through the rear end of the broken web getting follow its every movement. . . wound around one of the cylinders or an inter Instead of the pneumatic cylinders, other means mediary roll disposed between the two cylinders. such as hydraulic, mechanical or electrical means 'may be used to act on the lever Il inthe manner 25 25 The object of the invention is a pressure adjust ing device o! high precision which'has none of « these drawbacks. 1 ‘ ‘ According to the invention the impression cyl inder consists of a rotatable jacket on an eccen 80 trically journalled core, which core it rocked one -way or the other will either bring the impression described. The pneuniaticallyA actuated adjust ment device has however the advantage of being elastic, thereby preventing'undue strain on any of' the separate parts- of the printing mechanism in case . o1 breakage of the web and consequent $0 troubles. ' , ` ' Having now particularly describedyand ascer-\ the form cylinder, thereby adjustingthe degree. tained the nature ot my said -invention and in` of pressure. The rocking motion is eiïected by what manner the same is to be performed, I de l' ¿ 85 means of two pneumatic cylinders, one each for -. clare what I claim is: _cylinder nearer to, or remove it further away from ‘eiIecting either movement. - _ 1. In a rotary printing press, in combination with the form cylinder, a. cylindrical core rotat - Fig. 1 of the drawing is a side view of a pre ferred form of the device according to the inven tion; 40 . Fig. 2 a longitudinal section thereof. - . - » ably supporting an impression cylinder and hav ing journals eccentric relative to said impression cylinder, bearings for said journals, a two-arm 40 The printing mechanism comprises a. form lever attached to one of said journals. and means `c`ylinder l, an intermediary roll 2 and an'im-,pression cylinder, the jacket 3 of which rotates the same in either direction for turning said core connected to ~the arms of said lever for pivoting ~ The eccentrically` to thereby adjust the position of said ini-pression on the core 4 oi the cylinder. 46 - . A45 to the jacket 3 located journal 5 of the core 4 and . cylinder relative to said form cylinder. 2. The combination as speciñed in claim 1, in ` the intermediary roll 2 are carried by a slidable frame 6 which. by means of a -screw spindle 'l4 which said means for pivoting said lever comprises and a worm-_gear 9, N in the maimframe of. the ‘ two pneumatic cylinders, movable pistons in said . printing machine may be moved vertically within " cylinders, and piston rods connecting saidpistons y with the arms of said two-_arm lever. 50 wide limits torrough adjustment, or when ex changingia form cylinder of a certain diameter . ' - PAUL DIETRICH.