US819923A - Printing-press. - Google Patents

Description

PATENTED'MAY 8,1906.

P. M. RANDALL, JR.

PRINTING PRESS.

APPLICATION FILED 001.23. 1905.

3 SHEETS-SHEET 1 WITNESSES:

PATENTED MAY 8, 1906.

S )8 Tun LR AP D M I RT m R P IAPPLIOATIONIILED 0012s. 1905.

3 SHEETSSHEET 2 anuenfoz Presses, of which UNITED STATES PATENT OFFICE. v

Specification of Letters Patent.

Patented May a, 1906.

Application filed October 23.1905. Serial No. 283,946-

To all whom it may concern:

Be it known that I, PHINEAS M. RANDALL, Jr., a citizen of the United States, residing at Westerly, in the county of Washington and State of Rhode Island, have invented certain new and useful Improvements in Printingthe following is a specification, reference being had therein to the accompanying drawings.

This invention chines.

The object of the invention is to so construct a rinting-machine, in which at least one mem er of the printing-couple is a rotating 0 linder, that a lost motion may be al lows to one member or a part of onemember of the couple under conditions which would otherwise produce blurring or inferiority of impression or work injury to the machine.

It is well known that in nearly all'kinds of so-called rotary printing-presses the printing-couple, consisting of two cylinders or one cylinder and a traveling bed, the c linders (Where two or more are used) or the ed and cylinder constituting the printing-couple are geared so as to have the surface speed of the two members identical.

As one of the members has the type or printing-surface and the other member has the impression-surface, it is necessary that the gearing by which the members of the couple are connected shall be calculated with reference to the movement of the peripheries of these-surfaces. Usually in addition to a positive gear connecting the members of the couple there are smooth bearing-surfaces on the members of the couple, which bearers come in contact as the parts move forward.

As type or plate machines vary in thick,- ness, the elevation of the printing-surface 'va ries from the calculated'ortheoretical level, and if this variation be in the directionof elevation the face of the form moves faster than it should' If the t pe is low, the, surface moves slower. Un er such circumstances there is a tendency of one member of'the couple to scrape or strip the surface ofthe other member. This tendency I overcome in manner I will proceed. to describe.

Figure 1 isan end elevation of so much of a two-cylinder or web-printing machine as is necessa togive an understanding of the present invention. Fig. 2 is an end'elevarelates to printing-mation of the printing-couple, part of the frame being indicated in dotted lines. Fig. 3 is a vertical section of cylinder, showing a yielding impression-shell-thereon and showing a reciprocating bed in elevation, parts of the press deemed unnecessary to the invention being omitted. Fig. 4 is an end-elevation of part of the couple shown in Fig. 3. Fig. 5 is an elevation of a cam-ring and cams thereon, hereinafter referred to. Fig. 6 is an edge view of cam-ring and cams, showing relation of friction device thereto, as hereinafter explained, Fig. 7 is a diagrammatic broken side elevation of a printing-machine in which a reciprocating bed is one of the members of the printing-couple. Fig. Sis a cross-section of. the same. Fig. 9 is a broken detail section of-the traveling means for holding the latter by friction. Fig. 10 is a front elevation of a bracket which i attached tothe bed and a locking-lever and a friction-holding lever attached thereto. Fig. 11 is an end elevation of cam 42 and the adjustable cam thereon.

In F i 1, A represents the impression-cylinder, and B the form-cylinder, of a wellknown class of printing-presses. These cylinders are geared to rotate together, as by gears C C, and: have bearers D D moving in contact, as usual. The impression-shell of the cylinder A is marked a in the drawings and is shown in section in Fig. 8. Now assuming that the type forms or plates 6 are abnormally high then it is apparent that the surface s eed of these plates or forms will be greater tl ia'n the surface speed of the impression-surface of shell a, of .normal height, and as the cylinders forming the printingcouple are geared to move together there must be a scra ing or blurring movement of the surfaces. uch movement may be very small, but is often great enough to give a blurred appearance to the printed sheet. Moreover, t

bed, its yielding surface, and

e strain and wear on a pressu'ndersuch 0011- ditions are very great. 'fects by permitting a yielding movement of the impression-suiface of shell c in the instance cited, as I will explain; but it is obvious thattlie yielding might as well be on the part of the other member of the couple-that is, of the forms or plates on the form-cylinder. The impression-shell a may be divided on a radial line or lines, as c, Fig. 3, or it may be a hollow cylinder having a normal initial posi- I overcome the de-' tion, in which it is held by strong springs 1 1, carried on the ends of the cylinderand rigidly secured to a hub on the cylinder, as at 2 2. Pins 3 3, projecting from the end of the cylinder, define the initial position of these springs. Pins 4 4 extend from the impression-shell a, through cu -ved slots in the end of the cylin derin position to bear against the springs 1. Then the abnormal movement of the plates or forms I) will simply produce a corresponding 'nmvement of theimpression-suiface of shell (1 against the resistance of springs 1. The ears and bearers will move in unison, and the form-suiface and impiessi'on-sumface will also'move. in unison, but at a difieient velocity from that of the bearer movement, and there will be no unusual strain on the gems.

1 When the drag of the forms on the impression-suiface has ceased by the rotation of the cylinder to a break in theforms, (as be. tween sheets or between pages,) the springs 1 will restore the 'su. face shell 0. to normal position, so that the'leading edges-of the print- 2 5 ingcouple are in register. To prevent a too rapid recoil of the springs 1, a friction-holding I device may be applied. Thus letfi indicate a bracket at the end of the cylinder A, and 7 a crank-lever pivoted in the bracket. A roller 30. Sis journaled on the outer arm ofl'ever 7. (See. Figs; 1, 5, and 6.) A pin 9 extends through the end flange of cylinder A, and its inner end rests against theend of impressionshell a. Attachedto the frame of the press 3 5 there is a cam-ring 12, on which-cam-pieces 13 are adjustable, being held in place by set screws 14. or in other suitable manner. (See Fig. 6.) As the'cylinder rotates the lever or levers 7, cariied thereby, will-pass the cam rings 13 on the fixed ring 12', and roller 8, engaging said cams, will rock lever? thus pressing in the pin?) to ap' ly a strong holding-pressure against the en of impression-shell a. The circumferential length of cam 13 will determine how long this ressure shall be main-- tained. The cams .wi l ordinarily be placedopposite the breaks in the forms and are adjustable and removable, so that 'the press mav forms. As soon as roll 8has passed off from cam 13 the springs 1 will resume control-of the impression-piece. 5 v

. Vhen the-invention is applied to a cylinder having gri )pers-tograsp a sheet, it is' irn'por 5 5 tant that t e yielding part be held at 'thein? "stant the grippers closet-o prevent'the' 5;; ip-" pers from moving the yielding piece; To this end a pin 20 is passed through the end disk of the cylinder A; this pin is normally held iiiriicring. .211, embracing the head out by forked of pin 20. ed; camv 22:on the frame 'en counter-sv the; head ofmpin 20; as the cylinder rotatesv and forces the tint of the inintoa U hole 23 in: shell a, w "Te the cylin er' moves' the pin pastthe .cam 22, after-which the type-forms rest.

be adjusted to differenttype'or plate spring21 willwithdraw pin 20, and the shell 0. againgcomes under the cont ol of springs 1. Precisely thesame principles are a 'plicable to a printing-press in which one of t e members of the printing-couple is a reciprocating bed instead of a 1 otating cylinder.

A p; inting-eylinder is substantially the same as .a curved bed or a flat bed is the surface of a cylinder straightened out. Cams on the side of the frame will operate in the same way to move locking pins or levels outward or inward, as on a flame past which a cylinder rotates. I

In the modification Figs. 7 and 8 the flat bed 30 of the press has longitudinal recesses 31. In the bottom of each recess-31 there is a hardened .plate 32, length of the yielding bed 33, on' which the Rollers 34 rest on the har-. dened plates 32, and a hardened track-plate 35 runs on these rolls. The bed 33, being rigid with the track-plates, ma move lengthwise of bed 30 with verylitt e friction and the hardened plates prevent rapid wear of the parts. At each-end of the bed 33 there are springs 36, attached to the lower'bed 30,.and extending up through holes in this lower bed andresting against the ends of bed 33 to hold, said bed normally'in position-to move with bed 30, but permitting said bed 33 to have an independent movement against the pressure of the springs, when the conditions 'of surface contact-between the forms on bed 33 an'dthe impressiomcylinder call for a redisposition of the surfaces of. the printing couple, The bed 3Q has brackets 40;secured to its sides, and a lever 41 is pivoted in each bracket 40.' These levers of course articipate in the longitudi- .nal movement 0 the press-bed. Cams 42 on the frame at the sides of the press-bed are engaged bylevers 4 1 as the bed recipro'cates and the'levers 41 are turned on their pivots against the pressure of sprin s 43 by engage-, ment with t es'e cams as the Teversmove past the cams. Brackets 40 carry also levers 45,

which plates are just the which operate in the same Way as do levers 41 to press the pins 46 and so apply friction to the bed '33 and resist its yielding. Levers .41 press in pins 47 to lock the bed 33 positively except whenunlocked by the action of the c'ams'48, which cams are adjustable, as

has already been described with reference to cams 14. I I

, From the foregoing it should be under stood' that the operation of the ress is substantiallyfihe same whether t 1e printingouple betwo cylinders or a bed and a cylinderu in either case one member of the couple has a yieldingpart which bears one of the (5011-. tact-surfaces, and thisyielding part is held to normal position by springs and may be locked in; such position. The movement of the member which bea rs'this yielding 'art unlocks the same: at a' predetermined ace, de' termined by the 'adjustm'ent'of a cam on the from the theoretical level of contact and prevent wear not onl on the printing and impression surfaces, ut on the gears by which the members of the couple are compelled to travel together.

The advantages of my invention are reat. Absolute register of the members 0 the rinting-couple may be had, even though the orms are high or low, and this without strain on the gears or bearers of the press. better printing may be done where the types or .forms are imperfect-than has heretofore been the case.

I In a printing-machine, the printingcouple geared to move at uniform speed,

with a, contact-piece of one of the couple held by springs so as to yield in the direction of movement under increased pressure.

2. The combination with the cylinder of a printing-press, of 'an impression-shell, and springs to hold the same to operative position, while permitting a circumferential yielding.

3. The combination with the printing-couple of a printing-machine, of a yielding contact-piece'attached to one of the members and means to controlthe yielding thereof, means for positively locking such yielding piece, and means for unlocking it at a predetermined position in its movement.

4. The combination with the printing-coumeans Much ple of a printing-machine, of a yielding part bearing a contact-face, means for locking this art, and means for unlocking it as the memer moves.

5. The combination with a cylinder of a printing-press, of a rotativelyyielding shell,

springs for holding the shell in normal position, and means for locking the shell to the cylinder.

6. The combination with the cylinderof a printing-press, of a rotatively-yielding shell,

or locking the shell to the cylinder,

and means for unlocking-the shell by the movement of the cylinder.

7. The combination with the cylinder of'a printing-press, of a rotatively-yielding shell,

a friction device for obstructing the yielding of said shell, and means for applying the friction device.

' 8. The combination with the cylinder of a printing -press, of a rotaJtively-yielding shell, a frictional holding device for said shell, and

adjustable cams on the frame by which the pressure of said holding device is a plied.,

9. The combination with the cy inder of a printing-press, of a rotatively-yielding shell, a lockin pin in position to enter said shell, a cam to lock said pin, and means for withdrawing said pin.

l0. Thevcombination with one of the members of a printing-couple, of a yielding art hearing one of the contact-surfaces, a by which said piece is held against yielding, and means for automatically unlocking said piece to ermit the yield.

11 testimony whereof I afiix my signature in presence of two witnesses.

. PHINEAS M. RANDALL, JR. Witnesses: I

ABEL P. RANDALL, JAMES MAXWELL.

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