US2568761A - Pressure adjustment and trip for printing cylinders - Google Patents

Description

Sept. 25, 1951 H. E. PEYREBRUNE PRESSURE ADJUSTMENT AND TRIP FOR PRINTING CYLINDERS Filed March 22, 1946 4 Sheets-Sheet 1 INVENTOR. flan/z Efgqrebrana q 1951 H. E. PEYREBRUNE 2,568,751

PRESSURE ADJUSTMENT AND TRIP FOR PRINTING CYLINDERS Filed March 22,- 1946 4 Sheets-Sheet 2 INVENTOR. flan/2i" Pqyrebr'urze,

P 25, 1951 H. E. PEYREBRUNE 2,568,761

PRESSURE ADJUSTMENT AND TRIP FOR PRINTING CYLINDERS Filed March 22, 1946 4 Sheets-Sheet 5 IN V EN TOR. ffezz/zifeyreruma p 25, 1951 H. 5. PEYREBRUNE 2,568,761

PRESSURE ADJUSTMENT AND TRIP FOR PRINTING CYLINDERS Filed March 22, 1946 4 Sheets-Sheet 4 INVENTOR. 176mm ffia/rebruzze,

iatentecl gept. 25,

UNITED A STATES PATENT OFFICE PRESSURE ADJUSTMENT AND TRIP FOR PRINTING CYLINDERS enri E. Peyrebrune, River Forest, 111., assignor,

by mesne assignments, to Miehle Printing Press & Manufacturing Company, Chicago, 111., a corporation of Delaware Application March 22, 1946, Serial No. 656,255

4 Claims. (01. 101218) The invention relates to printing presses and has reference more particularly to improved tripsion cylinders duringthe printing operation.

In ofiset printing presses the impression to be printed is transferred by the plate cylinder to the blanket cylinder which 'in turn forms a printing couple with the impression cylinder to print the. design on sheets passed between the cylinders. It is old in the art to trip the cylinders of such a press to interrupt the regular contact between the cylinders thereby to intermit the normal printing operation. For such tripping purposes it has been proposed to eccentrically mount the impression cylinder and to also eccentrically mount the blanket cylinder, independent actuation of said eccentrics serving to produce the desired tripping functions; Subsequent developments, as disclosed by the patent to Robertson 1,107,843, granted August 18, 1914, contemplate the mounting of the blanket cylinder for movement in two directions with tripping of said cylinder from the .plate and then from the impression cylinder taking place in timed sequence and in the order named. More recent improvements as disclosed -mode of operation over previously known mechanism representing the prior art.

A further object of the invention resides in the provision of improved tripping mechanism for offset presses embodying a novel arrange- .ment of eccentrics for journalling the blanket cylinder and which will have a mode of operation whereby both eccentrics are instrumental in "efiectingmoveme'nt of the cylinder for tripping 2 with respect to the impression and also the plate cylinder, although rotation is imparted to only one eccentric at a time for producing the tripping operations, respectively.

Another object is to provide improved tripping means for an offset press having eccentric mechanism at the respective ends of the blanket cylinder for journalling the cylinder, providing for movement in two directions whereby to move the blanket cylinder out of contact with the impression and plate cylinders respectively, and wherein said mechanism embodies two eccentrics having mounting relation one on the other with relative rotation of the eccentrics taking place for effecting said tripping operations.

Another object of the invention is to provide eccentric journalling mechanism for the respec tive ends of the blanket cylinder adapted to effect tripping movements of said cylinder with respect to the impression and plate cylinders and wherein said eccentric journalling mechanism has combined therewith pressure adjusting means for varying the squeeze pressure on the sheets as they pass between the impression and blanket cylinders during the printing operations.

Another object of the invention is to provide eccentric journalling mechanism of the type and for the purposes described having combined therewith pressure adjusting means for varying the printing pressure between the blanket and impression cylinders and which is capable of actuation to adjust said pressure during a printing operation, the said pressure adjusting means incorporating a combination worm and spur gear and associated mechanism making possible said adjustments during printing.

With these and various other objects in view, the invention may consist of certain novel features of construction and operation, as will be more fully described and particularly pointed out in the specification, drawings and claims appended hereto.

In the drawings which illustrate an embodiment of the device and wherein like reference characters are used to designate like parts- Figure 1 is a vertical sectional view showing the trip mechanism of the invention applied to the blanket cylinder of an offset printing press, the-cylinders being on impression; I,

Figure 2 is a vertical sectional view similar to Figure 1 but showing the trip mechanism in tripped position with the cylinders off impression;

Figure 3 is a transverse sectional view taken 3 vertically through the frame of the press and showing the eccentric journaling members comprising the trip mechanism of the invention;

Figure 4 is an elevational view showing the improved gear drive for the pressure adjusting means of the invention; and

Figure 5 is a sectional view taken substantially along line 55 of Figure 1.

Referring to the drawings, particularly Figures 1, 2 and 3, the side frames IIJ comprise the side members of a conventional offset type of printing press which has been selected for illustrating the present invention. The side frames are spaced for receiving and journalling the printing instrumentalities including 'a plate cylinder Il,a blanket cylinder I2, and an impression cylinder I3. The plate cylinder II carries the conventional plate which is inked by ink ing rollers not 1 liminary inking 'offthe plate cylinder, or when it is found that a sheet is not being fed to the printing couple or is'being fed improperly registered. Them'ovementpf the blanket cylinder from contact with its companion cylinders willenable the passing "of a sheet through the press without givingthe sheet" an impression.

For tripping the blanket cylinder as above described, the cylinder isjournalled at its respective ends by a novel arrangement ofeccentrics, as best shown in'Figu'res land 2. However, the plate cylinder II is 'journalled in the frames of the press by means'of fixed bearings and the impression cylinder 13 is likewise journalled'in' fixed bearings whereby these cylinders do not have bodily movement but 'only'rotary movement for performing the printing operations. The journalling shaft I4 for the blanket cylinder I2 is mounted at its respective en'dsby' an inner eccentric journalling member I5, as illustrated by Figure 3, the said memberproviding'the roller'bearings I5. The outefeccentric joiirnalling member ll is mounted 'on member I5 in a'inanner' whereby the same may rotate with'respect to member I5. The journallingmem'ber IIis supported by the frame II] of the press and conventional mechanism is provided,"to'be presentlydescribedffor independentl rotating'the eccentric members 15 and I? to effect the tripping movements of the blanket cylinder.

The arrangement of the three cylinders is such that the period of time, during which theinked plate is transferring the 'design'to the blanket cylinder 12, is not coincident with the period-of time during which the impression is being printed upon the paper-passing betweenthe cylinders I2 and I3. Thusyit is desirable, in the event of a misfeeding or misalignment of a fed sheet, to first trip the blanket cylinder with respect" to the impression cylinder, and then with respect to the plate cylinder, thus permitting thecomplete transfer of the inked impressionfrom the plate cylinder to'the blanket cylinder.- Bycompleting the transfer of the impression "tothe takes place following the tripping operation. In other words, since the two operations of inking and printing are sequential, the trip and return of each should be sequential, and this mode of operation is contemplated for the two eccentric journalling members, namely, I5 and I1, provided by the present invention forj ournalling the respective ends of the blanket cylinder.

Referring to Figure 1, which shows the cylinders on impression, it will be observed that the eccentric l5 has been located in a definite position' with respect to the axis a--b which connects the centers of cylinders II and I2. The high portion I8 of said eccentric and the low portion 26 of the same are in opposed relation and areapproximately bisected equally by said axis. Referring to the eccentric journalling member ll, it will be observed that a similar arrangement also exists. The axis cd connects the centers of cylinders l2 and I3 and the eccentric I'I has a definite relation with respect thereto and wherein said axis bisects approxi- 'mately equally the high portion 2| and the low 'portion ZZ of said-member. As a result of this construction rotation of the inner eccentric I5 will operate to move the blanket cylinder in a plished automatically during operation of the press and the invention contemplates the provision of any conventional mechanism for'this purpose whereby rotation in clockwise direction is applied to the'shafti23 for. tripping with respect to the impression'cylinder, and then to shaft'24,

for tripping with respect to the plate cylinder.

Upon rotation of shafti23 motion is imparted. to'yoke 25 since .theparts are connected by means of the lever26-and link'Z'I. fThe link-is pivoted to the lever at 28 and the: opposite. end of the link is pivoted at 30.120 an ear'3l formed integral with and projecting outwardlyiof yoke; 25. 'QSaid shaft 24 has the lever 32 fixed thereto and the end of this lever is pivotally connected as at 33 to the threaded member 34. The 'member passes through sleeve '36 and is suitably; held to the '37 at the respective'ends of .thexsleeve.

sleeve in adjusted-position by-means of .the nuts The sleeve is pivotally joined asxat 38eto thebracket lil suitably secured asbyscrews 4| to the outer eccentric IT. The yoke 25, as *best shownin Figure 3, is rotatably .mounted on the inner eccentric I5 having a juxtaposed position, however, with respect to the outer eccentric [1. The worm wheel gear segment is suitably secured to eccentric I5 as by-in'eans vof:the:.bolts 43 and the parts are locked in secured relation bymeans of the key 44. Adjustable connection between the eccentric I5 and the yokesz5aisaccomplished through the ginstrumentality of :the ;.combination -worm and spur gear"45; carried-by the yoke,the

said 'gear being: located :between theyoutwardly projecting bosses A6 and being journalled by the shaft 41. It will be 'seeri that-rotation of the combination gear' 45- will produce movement of the gear segment 42 and therewith the inner eccentric 15, the spiral convolutionsof saidgear having meshing relation'with'the segment. The I structure, therefore, provides adjustingymeans blanket cylinder proper printing of the first sheet wherebythe rotative position ofeccentricifi may be adjusted relative to the yoke25; In accordance with the invention it is desirable to adjust eccentric from the exterior of the press frame since the rotative adjustments or this eccentric with respect to its associated parts will vary the squeeze pressure applied to the sheets as they pass between the blanket and impression'oylindersin-the printing operation. To accommodate rotation of yoke 25 which produces bodily movement of the combination gear 45, the said gear functions both as a worm gear as well as a spur gear, it being clear from Figure 4 that conventional gear teeth are cut into the convolutions forming the worm.

The drive shaft for the printing pressure adjustment is indicated by numeral 50, the same extending transversely of the press, as shown in Figure 4, being suitably journ'alled at respective ends in the spaced side frames ID. A worm gear 5| is fixed to said shaft 50 at each end .of the same relatively adjacent the journalled ends of the shaft and said worm gears have meshing relation with a combination worm and spur gear .45, respectively. This relationship between each worm gear 5| and its respective combination gear 45 is. maintained notwithstanding the fact that the combination gear has bodily movement which resultsfrom rotation of the yoke for tripping the blanket cylinder with respect to the impression cylinder. .It will be observed that when the cylinders are on impression, as shown in Figure 1,

the worm 5| has meshing relation with the combination gear 45 adjacent the lower end of said gear. However, when the cylinders are off impression the said worm 5| has meshing relation with the upper end of the combination gear 45. The provision of conventional gear teeth in the convolutions of gear 45 permit this bodily movement when the combination gear rotates upon rotation of worm 5 l A sprocket 52 is fixed to the outer projecting end of shaft 50, as shown in Figure 4, and the endless chain 53 operatively connects said sprocket with sprocket 54 journalled by the stud shaft 55 provided by one of the frames Ill of the press. The gear 56 rotatingwith sprocket 54 has meshing relation with the'pinion 5! which pinion is manually rotated by the handle 58. The pinion 60 also has meshing relation with gear 56 and the gear 6| meshes with-the pinion so as to be driven thereby. Said gear is suitably fixed to shaft 62 so that the pointer 63 is accordingly rotated upon movement of the gear. The disc 64 is provided with indicia lsuch as 65 indicative of the printing'pressure since the graduations on said dial represent the distance between the outer peripheries of the blanket and impression cylinders in units of onethousandths of an inch. 3

For describing the operation of the tripping mechanism and pressure adjusting means of the invention, it will be assumed that the cylinders are on impression as shown in Figure 1. In the event it is necessary to trip the blanket cylinder with respect to the impression cylinder, due to the absence of a sheet or the misalignment of a fed sheet, the shaft 23 is automatically actuated by the tripping mechanism of th press, the same rotating in a clockwise direction to impart clockwise rotation to yoke 25 and the inner eccentric l5. The rotation thus imparted to eccentric l5 will produce movement of .the cylinder in a direction substantially parallel to the axi c-d, thus spacing the blanket cylinder with respect to the impression cylinder. As a result of this tripping operation the combination gear 45 is bodily moved, thus changing its position with respect to its driving instrumentality, the worm gear 5|. Bodily movement is permitted as a result of the teeth out in the convolutions of gear 45. Rotation of shaft 23 to trip the blanket cylinder from the impression cylinder will set mechanism which subsequently causes clockwiserotation of shaft 24 and through lever 32 and link 34 theouter eccentric is rotated in a clockwise direction, producing movement of the blanket cylinder ina' directionparallel to the axis (1-12 and thus moving said cylinder out of contact with the plate cylinder |l. As previously explained, since the operations of printing and inking are sequential, the trip and return of each are sequential, and the invention provides a pair of eccentrics at each end. of the blanket cyylinder capable of such operation and which have associated relation with each other with one eccentric being mounted for rotation on the other.

In accordance with the invention, it is possible to adjust the printing pressure and thes adjustments can be made during printing and without disturbing or interfering with the tripping operation. It is only necessary to rotate handle 58 in the required direction for either increasing or decreasingthe squeeze pressure, causing rotation of gear 51 and gear 56 meshing therewith. Gear 56 drives the sprocket 54 which in turn drives sprocket 52, causing rotation of shaft 50 and the worm gears 5|. Thisrotation of the worm gears will be imparted to their respective combination gears 45, the same being carried by their yokes 25 and having bodily movement upon :rotation of said yokes for tripping purposes. Irrespective of the rotative position of the yokes, however, the gears 45 will be rotated and they will transmit their rotary movement to their respective worm Wheel gear segment 42 meshing therewith and thus the inner eccentrics l5 are moved to a corresponding degree. This movement of the inner eccentrics to adjust their rotative position with respect to yokes 25 and the outer eccentrics will vary the spacingv of the blanket cylinder with respect to the impression cylinder. Accordingly, meansv are provided for adjusting the printing. i. e. squeeze pressure exerted by the blanket cylinder on sheets passing through the printing; couple and which is operable fromthe exterior of the press where it is readily accessible to the: operator. The extent of the printing pressure is: visually indicated by means of pointer 53 asso ciated with dial 64. Rotation of gear 55 produces:

rotation, of pinion 50 and gear 5| with the result that the pointer will move in synchronous relation with the rotation of the combination gears. and the pressure adjusting parts associated there-- with.

For assemblying the eccentrics E5 and H it'- should be understood that eccentric H is see-- tion'al,.being formed of two parts, which construction, however, is not shown since the cross sectional views of the drawings do not permit this disclosure. Conventional means are provided for securing the sections of eccentric I! together after the same have been properly located on the inner eccentric I5. Another important struc tural feature is embodied in the design of eccentrics |5 which is internally recessed on its respective sides for receiving the preloadable roller bearings l6. These bearings provide substantially frictionless means for journalling the shaft M in addition to forming a durable, compact structure which also permits of rotary movement of the eccentric |5 for tripping purposes.

The invention is not -to be limited to or by details o'fconstruction of "the particular embodi ment thereof'illustrated' in the drawings, as various forms'of the device will of coursebe apparent to those skilled in the art without" departing from the spirit of the invention "or'the scope of the claims.

What is claimed is: r

1; .In'a printing press having a plate, blanket and impression cylinder and means for tripping said blanket cylinder away irom'said plate and impression cylinders, including nested eccentric members, the provision of means 'for adjusting the position of one of said eccentricmember'sto thereby vary the squeeze pressure of the blanket on the impression cylinder comprising a yoke rotatably'mounted on one of said members, a gear segment fixed tosaid member and arranged to mesh with a driven worm journalled bysaid yoke and movable bodily therewithjsaid *Worm having axial grooves'through its -spiral convolutions, and manually operable'means'remote from said'cylinder for adjusting the squeeze pressure between said blanket and impression cylinder in cluding a drive worm having meshing relation with the axial grooves 'of"'said" driven worm,

whereby said driven worm may move'bodily with said yoke during thetripping operation while maintaining the neshing relationo'f said gears.

-2. In an ofiset printing press,'the"combinati'o'n of a plate cylinder and-an impression cylinder having fixed axes of rotation, a blanket cylinder, eccentric means for tripping the'iblanketcyl'ir'ider off and on the plate andimpression' cylinders, and manually actuatedadjusting mean associated with said eccentri-c' m'eans' for varyingthe squeeze pressure between the" blanket" and impression cylinders while the press'is' 'in'operation, said adjusting 'means including a "movable" yoke for actuating the eccentric member whereby the blanket cylinder is trippe'dpif and'on the impression cylinder; a driving worm mounted "for rotation on a'stationaryshaft, a drive'nworm carried by saidyoke'to' move bodily therewith,

and a Worm-wheel gear segment associated with the said member to mov'e'it'jor adjustment'of the squeeze'pressure, said driven wormhaving its spiral convolutions cutto 'provide -axially"spaced circumferential rows of gear te'eth so'that-the meshing relationship between 'said worms is maintained irrespective ofthe position assumed by the driven worm due "toits bodily movement.

3. In a printing press; the combination'o'f a plate cylinder and an impression cylinder having fixed axes of rotation, ablanketcylinder'cperatively associated with said cylinder-spa shaftio'r said blanket cylinder, journalling means at each end of the shaft associatedwith'trippingrnechanism for moving the cylinder selectively m two directions, said means each inchidin'g an'inner eccentric member rotatable onth'e shaft andan outer eccentric member rotatable onsaid'inner member, a yoke mounted onzthe inner member androtatable to vary the "position-of the inner member with respect to the yoke, adjustable mean n't e" rm p e we e-Jewell??? 1X *1? yoke f r bod l m vem nt therew th seislver e h vin gro ves n its sp ra qenvqlu iq ss isnse p rallel with ts axi worrm s gm nt fi ed the inner eccentric member and arranged to mesh with-said worm whereby the squeezepres re betw en-sa d lol n etrcy d and-sai i pression cylinder may b varied, and means re?- mote fromsaid cylinder and including-a drive Wormhaving a constant meshing relation with said driven Worm for adjusting saidsqueeze pressure,-sa'idparal lel grooves in'said driven-worm permitting movement of said worm with the yoke While maintaining its meshing relation with the d i fir x q 4, Ina printing press having a pair of cylinders comprising a printing couple; means for" tripping one of saidcylinders with respect to theothei, inciudinga unitary arrangement of at-leastone eccentric member at 'each end of 'one of said cylinders' for jou'rnaling the same, said eccentric member" being mounted"for-rotation to perform said tripping operations, means for rotatingsaid'member including a yoke rbtata'bly mounted'pm said mem'beifltlie provisionof means for adjusting'the relative positions of said member and said yoke whereby to' vary the squeeze" pressure between said pair 'of cylinders and including a gear' s'eg ment-"fixed to the eccentric member, a'wor m journalled' in the yoke and arranged to mesh ally to"provide spurteeth' in its spiral "convolutions afdrive'*worm'having a' bodily'fixed position an'dar'ranged to'meshwith the spur teethiorm'ed 'intheiirs'tmentioned worm; and means remote fi'dm Sild cyiin'dei and associated With saidd'r-i've worm for effecting "adjustment of said driven worm to thereby "vary 's'aidsqu'eeze pressure; the grooves 'in'said driven wor'm permitting co istarit meshing relation between said wo'r'ms' wheiitlie cylinder istrippedaswell when it 'isi'n printingi ositionl l i I E. PEYREBRUNE.

nnFERENoEs CITED The following references are ofrecord in the fi "1? ,3 5} 1;

I NITED STAT

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