US1556379A - Stop-cylinder printing press with front delivery - Google Patents

Description

F. O. v. TRAITTEUR s'roP CYLINDER PRINTING PREss wml FRONT DELIVERY F110@ April 11, 1924 through the press. p .case .also di fferencesm theregister have been Patented Oct. 6, 1925.

UNITED :STATES FRIEDRICH osIrAR v. TRAITTEUR, or FRANKRNTHAL, GERMANY.

STOP-CYLINDER PRINTING PRESS WITH rRoN'I1 DELIVERY."

4Application l'ed April 11, 1924. Serial No.` 705,939.

T0 @ZZ whom t may concern;

Be it lknown that I, FRIEDRICH OsKAR v. TRAITTRUR, director of the Schnellpressenfabrik Frankenthal, Albert & Cie., citizen of the German Republic, residing'at Frankenthal, YRheinpfalz, Germany, have invented new and useful Improvements in Stop- Cylinder Printing Presses with Front Delivery, of which the following is aspecification. 1 *i The present invention relates to improvements in printing presses Ywith an intermittently stopped impression cylinder and a delivering table at the front end ofthe press. v il f The-delivery of the printed sheets of paper in printing presses with an intermittently arrested impression cylinder hitherto usually toolrplace by'means of av delivery drum in connection with'a reciprocating lever arrangement. All trials serving for the purpose of delivering the printed sheets at the front end of the press, that is to say'the printed surface of the sheet lying above and the top of the page inadvance running inv the direction fromvthe apex of the printing cylinder in the direction of yits revolution have never had a permanentsuccess. portant disadvantages were the results of all such trials, because the printed sheet of paper was drawn off from they stopped impression cylinder; and therefore the disadvantages which could notbe overcome were essentially the following:

The sheet intimately adheres duringtheprinting'process to the cylinder especially in cases wherethin sheets of paper are 'employed; therefore a strong holding .friction is Iproduced betweenl both Ycoacting,r parts which friction mustl be overcome' when the of the sheet surrounding the whole periphery of the printingcylinder. Thegamount of the friction being at least g even in the case when the diameter of the'cylinder being great enough to let the bacledge of the sheet drop down... The unfavorable. result of such arrangement thereforv consists in the fact, that the front edge of the paper where the' latter is drawn off by the gripping or clamping'device', is mutilated, especially if the sheet is fed several times In the last mentioned observed due to the deformation of the paper. further important disadvantage resides 1n the fact, that, when a sheet printed yon both sides is drawn off or delivered, the

first print is deposited on the surface of the cylinder.V .Finally vthe time for feeding in a fresh sheet of paper .is shortened or? reduced, so that the insertion of the new sheet of paper cannot more properly be executed by means of a resting table and registering` devices provided on the printing cylinder, but 1s to be doneby a governed table and governed gauge 1n. `v I i All other contrivances for diminishing the contact-friction by removing the sheet on the printing cylinderfor instance by blowmg air between the paper Vand the cylinder had no satisfying result, likewise no devices for decreasing the size of the sheet; TheJ said arrangementsr had lmerely-as result -a 'construction suitable for certain cases in practice. In printing presses with intermittently stopped cylinder the delivery device consisting of a delivery drum in connection with Aoscillating levers remained as the single usefulA one in spite of -allits disadvan-l tagesvery well known (as for instance the adhering of the fresh print to the cylinder,

to the delivery druma-nd tothe feedingl l immediately printedT upon whereupon after the print has beenV finished, that `is to'say after nearly. half a revolution counted from kthe apex ofthe cylinder; therefore the sheet kmay be fed to the delivery' table by using the lremaining `half of the revolution ofthe printing cylinder. This arrangement'cannot be executed in practice, because 'the de- 'livery of the sheets .would lie above the feed- 'ing table for the freshsheets andthe space necessary for the feeding table cannot be provided.

lThe invention now has for its principal obj ect afront delivery for the single' printed sheets, in which' the above named disadvantage is entirely obviated. The feeding in device is here effected in the usualknown manner by means of table provided above andy CII Yreeds V:transfers the sheet e to the cylinder 7; while driven again.

near the .apex of the printing cylinder. Hencethe sheet of paper is not immediately shifted to be printed upon but first to an auxiliary cylinder by means. of a gripping device; from the said auxiliary cylinder the sheet is takenolf by a second clamping or grasping device oppositely arranged in the printing` cylinder at an angle. of 180 (de grecs), which second gripping device will guide the sheet into the position for print and; henceto the delivery front table of the printing press, to which the sheet of paper is fed by utilizing the last half of revolution ofthe printing cylinder. The inling duct `is arranged in this case below the feeding in table yin opposition to the delivery drum.

In the annexed .drawing the impressioncylinder as well as the-intermediate auxiliary cylinder has been represented in three different positions `during the working operation. Figure 1- is a cross-section of the impression and intermediate auxiliary cylinders showingthe printing form in positionin order to print the. sheet, Fig. 2 is a similar view showing the printing form as almost completing its back motion and the sheet has just been received by the talre off arrangement, and:` Fig. 3 is another similar view sho-wing. theprinting` form in its com- .plete vback motion` under the color feed and Vthe sheet almost free from the take off arrangement.

Referring to the drawing; a represents the Aimpression or printing cylinder having -twosets of grippers al and f arranged at practically oppositepoints on the cylinder. The sheet e is-fed from a table and is transferred to the auxiliary. cylinder Y) by-ineans of. grippers m. The printing formv is represented by c and and 7c are a plurality of feeding rollers for the take off tongues or rlhe non-impression gripper (Z the impression gripper f grips the. sheet g yfrom* the cylinder ZJ. Therefore, the cylinder@ has an impression surface and a nonimpression surface.

The impression cylinder (1, in vFigure l being at the end of its position of rest, the printing form c has arri-ved in its 4dead- .point at the left hand side; theL grippers 'd are closed and 'have seized the sheet e for fthe .purpose of feeding it to the auxiliary cylinder Z7; when the. printing is started or The grippers f -have taken olf the sheet gf-in the manner represented;- frointhe auxiliary cylinder for carrying it into thev printing position.

Figure 2 shows the printing cylinder after a revolution of approximately 240 (degrees). 'llie print has been finished; the grippingdevice has guided the printed -sheet over theapex of the printing cylinder to the delivery table represented in the drawing by tonguesor reeds 7L and the feeding rollersz'. and la. The gripping device (Z has conducted the still unprinted sheet of paper to the auxiliary or transporting cylinder Z; which. has received it by means of the gripping device m; the printing form has assumed its. middle posi-tion,

Figure 3 shows the printing cylinder. a after having. fini-shed a total revolution (i. e., about 3600 in its position of rest), The printing form has reached its dead point at the right hand side; the gripping levers (Z are opened .for receiving a fresh sheet of paper The grippers have seized the sheet c from the auxiliary cylinder b and the printedy sheet g has been delivered to the front end table of the printing press.

I cla-iin:

l. A stop cylinder printing lpress comprising an impression cylinder having an impression surface and a non-impression surface each providedwith a gripper and an auxiliary cylinder associated with the impression cylinder which is adapted to receive the sheet to be printed from the non impression surface of the impression cylin- Y der and transfer it tothe impression surface of said impression, cylinder iny order -to remove the printed sheet directly from the impression cylinder to, prevent blurring of the ink.

2. A stop cylinderr printing press comprising an impression cylinder having an impression surface and a non-impression surface each surface having a gripper; and an auxiliary cylinder associated with the impression 'cylinder which is adapted to receive the sheet to be printed from the non-impression surface of. `the impression vcylinder and transfery it to the impression snrfaceof said impress-ion cylinder in order to remove the printed sheet directly from the impression cylinder to prevent blurring of the ink, said auxiliarycylinder being provided with a gripper.

`3; A stop cylinder printing press comprising an impression cylinder having an impression surface and a non-impression surface each surface having a gripper; an auxiliary cylinder associated with the .impression lcylinder which is adapted to receive the sheet tofbe printed from thenonimpression surface of the impression cylinder andtransfer it to the impression surface of .said impression cylinder in-v order to remove the printed sheet directly fromthe impression cylinder `to prevent blurring of the ink., said auxiliary cylinder' being provided with a gripper; and a feed table provided adjacent the impression cylinder adapted to feed the sheets of paper to the non-impression surface ofther-impression cylinder.

4. A stop cylinder printing press comprising an impression cylinder having an impression surface and a non-impression .surface each surface having a gripper; an

auxiliary cylinder associatedY with the -im` ypression cylinder which is adapted yto receive the sheet to be printed from the non? impression surface of the impression cylinder and transfer it to theimpression ysurface of said impression cylinder in order to remove the `printed sheet directly from the impression Vcylinder to prevent blurring of the ink, said auxiliary cylinder being ro- 10 vided With a gripper; a feed table provided adjacent the .impression `'cylinder adapted to feed the sheets of paper to the non-impresfv sion surface of the impression cylinder; and

ank inkingr mechanism associated with the printing form and Varranged below the feed table on the opposite side of the impression. p

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