US2470243A - Printing apparatus - Google Patents

Description

May 17, 1949.' G. o.- FROSTAD PRINTING APPARATUS 2 Sheets-Sheet 1 Filed April 16, 1945 INVEN '0 May 17, 1949. G. 0-. FROSTAD 2,470,243

4 PRINTING APPARATUS 1'. sh l. 2

Filed April 16, 1945 2 Shee s ee A TToRA eys.

Patented May 17, 1949 UNITED STATES PATENT OFFICE PRINTING APPARATUS George 0. Frostad, Milwaukee, Wis. Application April 16, 1945, Serial No. 588,537

7 Claims.

The present invention relates in general to improvements in the art of printing, and relates more specifically to improvements in the construction and operation of automatic printing apparatus.

The primary object of my invention is to provide an improved automatic printing machine which is simple in construction and efficient in operation.

It is frequently desirable in the printing industry, to produce a succession of similar impressions upon a rapidly travelling ribbon or band, in either one or several colors, and to insure accurate registry of the superimposed impressions if more than one color is desired. The type of band or ribbon to which printed matter is thus applied, also varies considerably, and may be either relatively heavy and tenacious stock, or comparatively thin and frail tissue, textiles, or rather sticky material such as Scotch tape having adhesive or a similar coating on one side thereof. In order to insure maximum production in this kind of work, the ribbon or band stock while advancing at high speed, should preferably be Withdrawn from a supply roll, printed, and promptly thereafter wound upon a receiving arbor; and in order to minimize production costs when operating on gummed tape, it is desirable to utilize the center cores of the supply rolls in the finally printed rolls of the ribbon. While many difierent types of high speed single and multi-color continuous printing machines have heretofore been proposed and used with varying degrees of success, these prior mechanisms are either too complicated and costly, or they are not adapted to function effectively when operating at rapid speed on varying types of material, or they are relatively bulky and difficult to adjust in order to insure sufficiently accurate performance.

It is therefore a more specific object of the present invention to provide a new and useful printing assemblage which is especially adapted to produce a succession of impressions upon a ribbon travelling at high speed, and which is extremely simple and compact in construction, and flexible in its adaptations for the performance of various kinds of work.

Another specific object of this invention is to provide an improved automatic continuous band or ribbon printer comprising few readily adjustable parts, and which may be utilized to effectively handle various types of ribbon stock including thin and frail tissue, textiles, and adhesively coated material.

A further specific object of my invention is to provide an improved printing press adapted to perform either single or multi-color work and to produce accurate registration of superimposed impressions, while the stock is advancing continuously at exceedingly high speed.

Still another specific object of the invention it to provide a compact and durable automatic prising relatively few sturdily built and readily adjustable parts, which may be manipulated by a novice to produce excellent results.

An additional specific object of this invention it to provide a compact and durable automatic printing machine which may be manufactured and operated at moderate cost, and wherein the stock supply roll center cores may be applied to the finally printed ribbon rolls in order to avoid waste of materials.

Another specific object of my invention is to provide a simplified and efficient inking mechanism for high speed printing machines, and improved mechanism for insuring most efiective cooperation between the impression and type cylinders of such machines.

A further object of the invention is to provide an improved printing assemblage which is operable by inexperienced help to produce perfect impressions, and wherein the supply and discharge mandrels may be quickly loaded and unloaded.

These and other specific objects and advantages of my invention will be apparent from the following detailed description.

A clear conception of the various features constituting the present improvement, and of the construction and operation of printing apparatus embodying the invention, may be had by referring to the drawings accompanying and forming a. part of this specification wherein like reference characters designate the same or similar parts in the various views.

Fig. 1 is a part sectional side elevation of a typical two-color printing assemblage built in accordance with the invention, looking toward the stock supply roll, the impression cylinder, the type cylinders, and the inking rollers, and showing the heating chamber and one ink scraper in action.

Fig. 2 is a central section through one of the type cylinders and through the adjacent ink roller, the section having been taken along the line 2-2 of Fi 1;

Fig. 3 is a fragmentary transverse section taken centrally through the impression cylinder and through a portion of the inking mechanism of the improved printing assemblage;

Fig. 4 is a part sectional end view of the improved printing assemblage, the section having been taken through the ribbon supply roll mandrel, and a supply roll having been shown in dotand-dash lines;

Fig. is an enlarged central longitudinal section through one of the type cylinder adjusting spindles;

Fig. 6 is an enlarged part sectional top View of one of the improved type cylinder and inking roller units; and

Fig. '7 is a fragmentary end view of a somewhat modified printing assemblage embodying the invention.

While the improvements havebeen shown and described herein as having been incorporated in a two-color printing assemblage adapted to be driven and heated electrically, it is not my desire or intention to unnecessarily restrict the scope or utility of the improved features by virtue of this specific embodiment.

Referring to the drawings, the typical twocolor automatic printing-apparatus shown therein comprises in general a stationary main frame a having a fixedhorizontal shaft 1-0 mounted thereon and projecting forwardly and rearwardly therefrom; an impression cylinder H of relativelylarge diameter rotatable upon the forward portion of the fixed shaft H1 and having an annular'cam surface I 2 facing the frame 9; one or more type cylinders 13 journall'ed for rotation upon fixed horizontalshafts I 4 secured to the frame 9 and projecti n'g "forwardly therefrom beyond the periphery *of thecy-linder I l, and each havingan annular rim cf type f5 embracing its periphery; an ink transfer cylinder or roller ["6 peripherally engaging the type rim E5- of each typeacylinid-e'r l3, and being-mounted for rotationupon. horizontal shafts -l lalscfixed to the frame a and projecting forwardiy therefrom; an ink supply well cr pan t8 detachably secured to the front of the frame 9 beneath each of the rollers t6; a flexible scraper 19 slid'ably' coactin with the periphery'of each inking roller 1-6 and being reciprocablerel'ativc thereto by means of alever 20 coacting with a plunge: rod 24 carrying a roller 2-2 engaging the-cam surface [2; a stock ribbon supply supporting shaft 23 secured to the lower portion of the frame Son the side of the impression cylinder It remote. from the type cylinders I3; a printed ribbon receiving. shaft 2 4 likewise secured to the frame 9 above the shaft 23 ribbon guiding rollers 25 mounted for rotation upon the frame 9 inv various selected localities a heating chamber casing 26 suspended from a bracket 28 secured to the frame 9 and being disposed above the impression cylinder II'; and

mechanism for constantly rotating the cylinders H, 13, rollers I15, and the ribbon supply and receiving mandrels at desirable speeds.

The main frame 9' consists. primarily of an upright wall having an integral broad base -29, and the horizontal'shaftslu", M, 17,23 and 2 are all firmly secured to b'osses formed integral withthe upstanding wall of the: frame. The impression cylinder I I is of relatively large diameter, and besides having the scraper actuating cam surface I-2 formed thereon, the rear portion of the cylinder H is provided with an annular series of peripheral teeth Z9 which mesh with the teeth of a driving gear 30 mounted upon a shaft 3| journalledfor rotation in the frame 9 between the sh'aftsxli'll zfi. Each 'ofl'thetype cylinders l3 is also provided with a driving gear 32 formed integral with a sleeve 33 which snugly engages the central bore of the type cylinder I 3 and is secured thereto by a two-part clamping ring 34 coacting with a split rear annular extension 35 formed integral with the cylinder I3 in Fig. 6; and the front portion of each cylinder I3 is provided with an integral knurled extension for efiectingaxial adjustment of the type cylinder I3 when the ring 34 has been loosened, so as to insure accurate registry of the printing impressions. Each of the inking rollers 16 which coact with the type cylinders I3, is also provided with a driving gear 36 which meshes with the adjacent type cylinder gear 32, thereby providing a positive drive from the main driving gear 30 to the impressioncylinder II, from the cylinder H to each type cylinder l3, and from the latter to the adjacent ink transfer rollers it,

As previously indicated and as illustrated in Fig. 6; each of the type cylinders 13 is provided with a type rim '55 which is preferably formed of rubber or the like; and the periphery of each of the ink transfer rollers 1 6- is coated with copper and is etched to provide an ink distributin screen the mesh of which may be varied tc suit the work which is to-be performed. The periph-- eral etched coating of "each roller I 6 may also be chromium plated or otherwise treated toprotect the etching, and each inking roller I 5 is moreover provided with ink throwers 31 at its opposite sleeve M has a through bore 4-2 which snugly engages the eccentric peripheral surface 53 of an internal adjusting sleeve "44 adapted to ro-- tatably engage the adjacent supporting shaft M, H, and the surfaces '40, E3- and bore 42 of each assemblage are generated 'about longitudinal axes which intersect the central shaft axis at a point 45 disposed intermediate the'opposite ends of the sleeves 61,44. Each outer sleeve 41 has an end' head 46 provided with a convex spherical zonesu-rface which engages a similar concave surface formed on the end head 4' 7 "of the corresponding inner sleeve T4, and the oppositeend of each outer sleeve 41 ismoreover provided with a fixed bearing plate 58 adapted to engage the adjacent frame 9 around the anchored end of each shaft I4, I1. A clamping nut-4 9' has screw'thre'adco'action with the outer free end of' each fixed shaft M, l! and clampingly engages the adjacent inner sleeve head 41, and by tightening these nuts 49, the sleeves 4|, 44 of the several sets may be clamped together in various positions of relative adjustment. Each inner sleeve end head 46 is provided with astem 50 while the sleeve end head 4 is provided with a'knurl'ed periphery 5|, for effecting convenient relative axial alinement by rotary adjustment of the sleeves 4'1, 4'4 of eachset about each other and about the corresponding fixed shafts I4, I! when the nuts 49 are loosene'd; and after relative axial adjustment has been effected", the sleeves 44 ma'y be locked together by a locking screw '52, whereupon the stem 58' again provides for convenient relative. rotary adjustment of the eccentric surface '40 for proper impressionsof type matter upon the impression cylinder ll.

Each of the ink supply pans I8 is detachably and adjustably secured to the frame 9 beneath its ink transfer roller l6 by meansof a clamp 53, and the rollers 16 are adapted to dip into the ink confined within these pans Is in a well known manner. Each of the flexible scrapers 19 which coact with the etched peripheries of the adjacent transfer rollers 16, is secured to a carrier slide 54 movably suspended from a plate 55 which is adjustable toward and away from its cooperating roller IS with the aid of an adjusting screw 56. The blade carrier slides 55 besides being adjustable with the aid of the screws 56, are also constantly reciprocable by the levers 20 through connections 51 such as shown in Figs. 1 and 3, and the actuating plungers 21 of the levers 20, are constantly urged toward the cam surface 12 of the impression cylinder, by means of springs 58 coacting with these levers and with the frame 9. Several pressure equalizing plungers 2| coacting with the surface l2 may also be provided, as shown in Fig. 1 of the drawing. The medial portion of each blade reciprocating lever 20 is pivotally attached to a block 59 having a pivot pin 60 coacting with the frame 9, and with this assemblage of elements, each blade l9 may be accurately adjusted to properly bear against its roller l6 and will also be automatically reciprocated so as to uniformly distribute proper amounts of ink upon the eripheries of the revolving ink transfer rollers.

As shown in Figs. 1 and 4, the ribbon supply and discharge roller supporting shafts 23, 24 respectively are rigidly secured to the frame 9 and while the arbor or mandrel for the receiving roll is positively driven, the supply ribbon mandrel is only frictionally restrained. The ribbon 6| may be either relatively heavy ordinary material, or thin and frail tissue, textile, or coated with adhesive or other substance, and the supply roll 62 is ordinarily provided with a center core 63 of cardboard, metal, wood or the like. The core 63 frictionally engages an outer segmental sleeve 64 which in turn coacts with a tapered solid internal sleeve 65 through a pin carried by each segment of the sleeve 64 and engaging a key-way in the sleeve 65. The segmental sleeve 64 is urged into frictional engagement with the center core 63 by a knurled nut 69 which interlocks with an annular recess 64 formed in the segmental sleeve 54, and the segments of this sleeve are held together by coil springs 70. A centering member 66 having spaced ball bearings coacting with the fixed shaft 23, engages the bore of the inner sleeve 65, and a fibre friction brake 8| is interposed between the inner sleeve 65 and the adjacent frame 9. The degree of frictional pressure exerted by the assembled segmental sleeve 64 and inner sleeve 65 against the friction brake 8|, may be varied by a compression spring 61 interposed between the ball bearing member 66 and an adjusting nut 68 screw threaded upon the outer end of the shaft 23. The knurled nut 69 obviously serves to expand or collapse the outer segmental sleeve 64 and the successive cores 63 may thus be frictionally secured to the outer mandrel sleeve 64. The crescent shaped springs 10 confined in peripheral grooves of the segmental sleeve 64 are adapted to collapse the segments and to hold them in engagement with the flange of the nut 69. With this mandrel assembly, a fresh roll 62 may be readily loosely applied by merely slipping the roll core 63 over the outer split sleeve 64, and may be frictionally restrained against subsequent free rotation by merely adjusting the nut 69 so as to expand the segments of the outer sleeve 64 into engagement with the core 63.

The mandrel assemblage for supporting the core 63 of the finally printed ribbon delivery roll 12 may be similar to that just described, but since the roll 12 and its core 63 should be positively rotated, the inner sleeve 65 of the upper mandrel is also provided with a driving gear 13 which meshes with the main driving gear 30 and is journalled upon the upper shaft 24 as shown in Figs. 1 and 4. This mandrel driving gear I3 is preferably connected to the inner sleeve 65 through a safety friction or fibre brake I lin order to permit slippage when the tension upon the ribbon 6i becomes excessive. The ribbon guiding rollers 25 are journalled for rotation upon horizontal shafts 15 and have knurled peripheries, and one of these rollers 25 is disposed between the supply roll 62 and the impression cylinder ll so as to insure delivery of the ribbon 6| to the cylinder periphery at a constant tangent, while two of the rollers 25 are mounted upon similar shafts 15 secured to the upstanding bracket 28 so as to guide the printed ribbon through the heating chamber 26 before delivery thereof from the machine. The heating chamber 26 may be electrically heated by means of a heater "[6 applied to a wall thereof, and quick drying ink is preferably applied to the pans I8.

The main driving gear 30 of the printing assemblage may be driven at any desired speed in any suitable manner, preferably with the aid of an electric motor, and when such a motor is utilized, speed reducing mechanism should be interposed between the motor and the gear 30. As shown in Figs. 1, 3 and 4 a pulley 11 of relatively large diameter is secured to the rotory shaft 3| rearwardly of the frame 9 and is connectable by means of an endless belt to a smaller pulley 18 which is journalled for free rotation upon the rear end of the fixed shaft Ill. The small pulley 18 is drivingly connected to another large pulley 19 which is also journalled for free rotation upon the shaft l0 and is adapted to be belt driven directly by the electric motor, thus providing a simple, compact and effective speed reducing drive for the main gear 30 confined in back of the frame 9 and having its propelling motor supported directly upon the frame base 29. The entire printing apparatus together with its driving motor may thus be associated with the main frame 9 to provide a compact and relatively portable unit adapted to be readily shifted from place to place.

While the type of drive shown in Figs. 1, 3 and 4 is entirely satisfactory for most purposes, it may be desirable when printing gummed tape, to provide a modified drive such as shown in Fig. 7. In this modification, the supporting shafts 23', 24' for the supply and discharge roll supporting arbors, are slidably and rotatably supported in bearings carried by the upright wall of the main frame 9. and collapsible mandrels are applied to the forwardly projecting portions of these shafts 23', 24. Each mandrel 8B is provided with a fibre friction brake 8| coacting with the adjacent frame 9, and is held upon its carrying shaft by a nut 82; and both shafts 23', 24 are constantly urged toward the right as viewed in Fig. 7, by means of compression springs 83 the tension of each of which is adjustable with the aid of a nut 84. The upper delivery roll shaft 24' is direct driven by means of a pulley 11 mounted thereon, and is provided with a driving gear 85 which meshes'with-s gear so as-in tag. a. ll nithe -inodi fled drive, the gear '30 is merely an -idler ge'a'r interposed between the driving gear 85 and the impression cylinder II, and the pulley 'l'i may again be driven by an electric motor in the manher previously described. The modified drive, because of its use of the collapsible mandrel 8i], inakes it possible to utilize in the finally printed roll, the same wood "or 'paper core which -is 1 61-- iiarily supplied in a supply roll er *of :gum ined tape, thus effecting cons'id'e'rable saving in cost and avo ding "necessity of carrying an assortment of cores for replacements.

Si'nce-the normal operation of the two printing assemblages, i disclosed "herein, is substantially the same, "it will sufiice to specifically describe the operationof only one of the units. During such .nori'na'l operation, it is necessaryior best results, 'to have the impressions produced by the several type '--cy-1irlders I3 pe'rfectly alined -'or re'gist'r'able, andsuch perfect registration may be quickly and readily efiec'ted with the aid of the adjusting mechanism shown in Figs. "5 and 6. Aiter the inksupply pans I 8 havebeen properly supplied withink of the desirable color and texture, the machine may be placed in operation by starting the driving motor and energizing the heater '16 so as to-confine --warm air within the chamber 26. Rotation' willthen be imparted "to the discharge 'mandrel assemblage and to the impression cylinder 'I I and 'fi'oin the latter to the type cylinders 13 and ink transfer roll'ers I6, through the gear teeth as'so'ciated'withtheseparts, thereby causing the ribbon *6] to 'be 'withdrawn'from the supply roll 62. The ribbon '15! thus withdrawn frem' 'th'e supply'rolr S'ZwiII-b'e advanced in succ'ession pastthe type cylinders I3 'which'receive ink from the rollers 6, andt-he printed ribbon-will be constantly-delivered to the discharge roll '72 after having passed through theheating chambe'r levers 2B and=pluiigers "M coacting -with the iear c'amsurfacel 2 of the impression cylinder I I If, after a test run has b'een rnade, it is -ifoun'd that the successive impressions which are "'sl'ip'erimposed over each other "bythe successive type cylinders I3, do not register accurately, perfect registration may be "effected -'either by niI e1y adjusting the type 'c'ylinders"IS' alon thei1" 'supporting sleeves 33 'or by "releasing the a-dfius'tirrg nuts 49 and screws 52- and thereafter "relatively adjusting the 'ecoentricsleeves" 4 I 5'44. Since thes'e sleeves '4 I 44 are 'adjustableabolit independent intersecting axes, the axes oi'rotation of the 'c'yl'- *inders' I3 and of the c'oacting'ink-transierrollers -I 5, may be universally adjusted *aoout' tlie point 35 so as to insure perfect annementx'between the rollers' lfii and the type'inatter*-I5,'and also'between thetype m'atter'and the impression cylinder I I by utilizing the' eccentricity'-*of the sui'tace ffl oftbe sleeve 4| for perfect kis's contactor'impressioll "with clb'se' tolerance. "The "eciustinent 'f theserollers' and cyiinders' iiiaybe 'ina-dewh'ile the machine isop'er-ating 7 because of the act that the rollers Wand Cy1irid'els I'5""are-j mailed or rotation upon' the 5 outersl'eeves IA semester Bpreper adjustment has been-'eiiected, the nuts 49 was may be driven into clamping lposition sand the adjustments will thereafter be maintained. :It he's been found in actual practice, that such radju'stnients can be made quickly and "effectively, and after perfect cooperation oi'the'sever-al :parts has been effected, the operation of the machine maybecontinueduntil the suppl-yof ribbon stock 61 -has-been depleted. After perfect vaz zia'lalinement of'the type matter I5 with the impression cylinder lI I has been eiiected, the :sleeves 41, :44 can lie-permanently united with the docking screw 52, and the eccentricity 0f the surface 40 can thereafter be utilized to obtain proper impression contact with the ribbon :61

:From the foregoing detailed udescription it will beapparent :that -my.present :inventionzprovides a relatively simple, compact and highly eflicient printing assemblage which may be operated at comparatively high speeds to print various "types of ribbon stock '61 including ordinary :rel-a'tively heavy material, thin and frail tissue stock, guinmedscotch :or masking tape, also silk rirayon tex-tile materialsin ribbon vform, or the like. in each case, friction clutches or brakes provided between 'the 'supply and receiving roll cores will maintainpmper tension upon the ribbon fiI vduring 1101 11131 operation {0f the -m'achine, and the frictional resistance -may be readily *and conveniently varied-toi prevent-possible overtensioning of liel icate' materials. The -suppl-y rolls 6 2 and the printed rolls 12 may be convenientl-y appli'ed to and removed' from the imachinaand the automatic heating -ass'emblage insures complete drying of the-impressions before the ribbon .61 is rolledn'pon the final receiving-roll 12. The ink supply pans 'IB m-ay'be 'readily removed and renewed and the improved ink distributingreciprocable scrapers I 9 "serve to most effectively distribute the: ink and-ito prevent excessive ink iro'm being :applied to the type-cylinders I 3. These scrapers =I9 while beirig constantly and automatically--reciprocable:by means "of the 1 levers 20, may also be 1 readily adjiisted to vary their cooperation with the ink transfer-rollers I6, by merely manipulating the screws-56 while the'machine is operating. "The type-cylinders ['3 may bequickly andconveniently removed for replacement of the typerims 15,-antl the ink-transfer rollers I S'lnay also :be 'qu-ic'kly and -conveniently removed for inspection and cleaning purposes. It may also'be desirablein some cases to perf0rate the ribbon 1 8 I at intervals, after the printed 'matter has been applied, and this-maybe 'readily accomplished by'providing a rotating perforatorinthe heating chamber fltabove the lower giiideroller 25-disposed Within this chamben and which may also 'besuspended' iromthe bracket'28.

The knurling of the peripheriesof'v the impression cylinder II and of theguide rollers 25 .is importantwhen operating upon Scotch tape or 'other-giim coated 'rib'bon, aszit prevents the gum from sticking or clinging to-these surfaces; and the" machine mayib'e' utilized :to print individual rolls of ribbon material of various Widths and in large or small 'quantitiesthus especially adapting the improvement for the production of'varions kinds of printed "ribbon stock at :extremely mocb erate cost. The apparatus may be utilized "with 'analine, wate'r, tar, and oil basein'ks, andeli-minates necessity of employing more costlymill r un printing in the production of '-labels, tabs or other strip printed itemsy'since the-typecylinders ltand transfer rolls I 6 may be quickly and readily replaced by similar elements "of different diam-- "etei's by virtue of the ad justability of their mount- "ings i-iriieri the name 9. The entire apparatus may be mounted upon a single sturdy frame 9 to provide a compact and portable unit, and the invention has proven highly satisfactory in the commercial printing of various types of ribbon stock, and especially tissue and gummed tape, the printing of which heretofore presented many difficult problems.

It should be understood that it is not desired to limit this invention to the exact details of construction or to the precise mode of operation, herein shown and described, for various modifications within the scope of the appended claims may occur to persons skilled in the art.

I claim:

1. Ribbon stock printing apparatus comprising, a frame, an impression cylinder journalled for rotation upon said frame about a fixed axis, a type cylinder coacting with said impression cylinder and being journalled for rotation upon said frame about a fixed shaft disposed beyond the periphery of said impression cylinder, a driving sleeve for said type cylinder surrounding but spaced from said shaft, means for effecting adjustment of said type cylinder longitudinally of said driving sleeve and across the face of said impression cylinder, and a pair of normally stationary but relatively adjustable and eccentric sleeves interposed in the space between said driving sleeve and said fixed shaft for effecting adjustment of said type cylinder toward and away from said impression cylinder.

2. Ribbon stock printing apparatus comprising, an impression cylinder, 2. type cylinder coacting with said impression cylinder, and a pair of relatively rotatably adjustable and eccentric sleeves one embracing the other and providing a journal support for one of said cylinders, said sleeves having relatively eccentric annular surfaces generated about axes intersecting each other within the supported cylinder.

3. Ribbon stock printing apparatus comprising, an impression cylinder, a type cylinder coacting with said impression cylinder, a pair of relatively rotatably adjustable and eccentric sleeves one embracing the other and providing a journal support for one of said cylinders, said sleeves having relatively eccentric annular surfaces generated about axes intersecting each other within the supported cylinder, means for effecting relative rotary adjustment of said sleeves, and means for locking said sleeves in various positions of relative adjustment.

4. Ribbon stock printing apparatus comprising, a frame having a fixed shaft projecting from one side thereof, an impression cylinder journalled for rotation upon the free end of said shaft, a type cylinder coacting with said impression cylinder and being journalled for rotation upon said frame about another fixed shaft projecting from the same side of the frame and disposed beyond the periphery of said impression cylinder, a driving sleeve for said type cylinder, means for effecting adjustment of said type cylinder longitudinally of said driving sleeve, and a pair of normally stationary but relatively adjustable and eccentric sleeves interposed between said driving sleeve and said fixed shaft, said eccentric sleeves having relatively inclined axes intersecting each other within said sleeve and being manipulable for adjustment at the free end of said second mentioned shaft.

5. Ribbon stock printing apparatus comprising, a frame having main and auxiliary shafts projecting from one side thereof, an impression cylinder journalled for rotation upon the free end of said main shaft, a type cylinder coacting with said impression cylinder and being journalled for rotation upon the free end of said auxiliary shaft near the periphery of said impression cylinder, an ink transfer roller journalled for rotation upon said frame about another fixed shaft, and a set of normally stationary but relatively adjustable and eccentric sleeves interposed between said type cylinder and its supporting shaft and between said roller and its supporting shaft, the eccentric sleeves of each set having relatively inclined axes intersecting each other Within the supported cylinder and each eccentric sleeve set being adjustable at the free end of said auxiliary shaft and also being interchangeably similar.

6. Ribbon stock printing apparatus comprising, an impression cylinder, a type cylinder driven by and coacting with the periphery of said impression cylinder, and a pair of relatively rotatably adjustable and eccentric sleeves one embracing the other and providing a journal support for said type cylinder, said sleeves having relatively eccentric cylindrical surfaces generated about axes which intersect each other within the sleeve length.

7. Ribbon stock printing apparatus comprising, an impression cylinder, a type cylinder driven by and coacting with the periphery of said impression cylinder, a pair of relatively rotatably adjustable and eccentric sleeves one embracing the other and providing a journal support for said type cylinder, said sleeves having relatively eccentric cylindrical surfaces generated about axes which intersect each other within the sleeve length, means for effecting relative rotary adjustment of said sleeves, and means for locking said sleeves in various positions of relative adjustment.

GEORGE O. FROSTAD.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,018,457 Vieser Feb. 27, 1912 1,101,951 Oliva June 30', 1914 1,507,436 Seymour Sept. 2, 1924 1,519,544 McIndoe Dec. 16, 1924 1,524,162 Barber Jan. 27, 1925 1,604,278 Goulding Oct. 26, 1926 1,647,948 Winkler Nov. 1, 1927 1,732,215 Barber Oct. 22, 1929 1,774,778 Wood Sept. 2, 1930 1,904,709 Avery et al Apr. 18, 1933 2,001,890 Rix May 21, 1935 2,018,282 Robinson Oct. 22, 1935 2,079,001 C'rafts May 4, 1937 2,181,935 Carroll Dec. 5, 1939

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