US2244593A - Multicolor printing machine - Google Patents

Description

June 941. i A. M. zucKEMAN i 2,244,593 MULTICOLOR PRINTING MACHINE":

Filed Feb. 3, 1940 s Sheets-Sheet 1 INVENTOR AdnZphMZuc/ferman.

A. M. i'ucKERMAN MULTICOLOR PRINTING MACHINE Jung s, 1 941.

' Filed Feb. .3, 1940 s sheets-sheet 2 :NvEfi-roR MZudrerman.

Aaz h ATTORNEY A. M. ZUCKERMAN I 2,244,593 YMULTICOLOR PRINTING June 3,1941.-

MACHINE Filed key. 3, 1940 3 Sheets-Sheet 3 F ail J) m H T N N R n E6 0 V n m1 7 A lllllllil lllll| ll Patented June 3, 1941 UNITED STATEh E ATENT OFFECE 2,244,593 MULTICOLOR PRINTING IlIACPIN E Adolph M. Zuckerrnan, New York, N. Y., assignor to R. Hoe & 00., Inc., New York, N. Y., a corporation of New York 22 Claims.

This invention relates to printing machines, and more particularly to rotary perfecting multi-color printing machines or presses in which the Web is dried after the printing of each side thereof by heating and cooling it.

In modern high speed rotary perfecting multicolor presses, where quick drying volatile ink and web drying units are employed, it is desirable that the printing and other units be so constructed, arranged and located with respect to each other as to produce the best results while occupying a minimum of space. To produce the best results, it is mandatory that the web be so guided or arranged that the freshly printed portion of the Web does not engage any instrumentality of the machine except the form cylinders until it has passed through a drying device to thereby prevent smutting of the web.

It is a matter of common knowledge in the printing art, that smutting, due to the freshly printed ink touching a roller, turner bar or other instrumentality, is one of the obstacles that has obviated the attainment of greater printing speeds in magazine presses, and it is only in recent years that steps have been taken to overcome this. The web lead or arrangement disclosed in recent patents accomplishes this result. but so far as applicant knows, no multiunit arrangement such as that disclosed herein has taught the art how to avoid engaging the freshly printed side of the web until the ink is dried.

It is also highly desirable that the units be so constructed, arranged and located as to insure positive web control and short leads, and, at the same time, affording convenient access to the manipulatory components and units of the press.

It is, therefore, an object of this invention to provide a rotary multi-color perfecting printing machine in which the freshly printed web is dried by heating and cooling it immediately following the printing of each side of the web without the freshly printed ink engaging any instrumentality of the printing machine except the form cylinders until the ink is sufficiently dried.

An additional object of this invention is to provide a rotary multi-color perfecting printing machine in which the ink on a freshly printed web is dried prior to its engagement by any instrumentality of the mechine except the form cylinders, and in which the units are so constructed, arranged and located to insure positive web control and convenient accessibility to the units of the printing machine.

Another object of this invention is to provide a rotary multi-color perfecting printing machine in which the web is dried by heating and cooling it immediately following the printing of each side thereof, and in which the units and components are so constructed and arranged and also so located with respect to each other that they produce a web loop of substantially closed formation.

A further object of this invention is to provide a rotary multi-color perfecting printing machine in which the web is dried by heating and cooling it immediately following the printing of each side thereof, and in which the units and guide components are so constructed and arranged and also so located with respect to each other that they form a web loop, a portion of the Web bridging over or passing around a web lead or portion of the loop to permit the webto pass from the interior of the loop to a position outside the loop.

A more specific object of this invention is to provide a rotary multi-color perfecting printing machine in which the Web is dried'by heating and cooling it immediately following the printing of each side thereof, and in which the units and guide components are so constructed and arranged and also so located with respect to each other as to produce a web loop of substantially closed formation, a portion of the web bridging over or passing around a web lead or portion of the loop to permit the web to pass from the interior of the loop to a position outside thereof, and the impression cylinders of each printing unit being located within the loop and positioned with their axis in parallelism.

It is also an object of this invention to provide a rotary perfecting multi-color printing machine of generally improved construction, whereby the device will be simple, durable and inexpensive in construction, as Well as convenient, practical, serviceable and efiicient in its use.

With the foregoing and other objects in View, which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that various changes in form, proportion, and minor details of construction may be made within the scope of the claims without departing from the spirit or sacrificing anv advantage of the invention.

For a complete disclosure of the invention, a detailed description of the improved multi-color perfecting press will now be given in connection with the accompanying drawings forming a part of the specification, wherein:

Figure 1 is a diagrammatic side elevation depicting the improved rotary web perfecting multi-color printing machine,

Figure 2 is an enlarged diagrammatic side elevation of a portion of the printing machine,

Figure 3 is a diagrammatic vertical sectional view taken on the line 33 of Figure 2,

Figure 4 is a fragmental diagrammatic side elevation of a modified form of the invention,

Figure 5 is a fragmental diagrammatic end view of the form of the invention disclosed in Figure 4,

Figure 6 is a fragmental diagrammatic side elevation of another modified form of the invention,

Figure '7 is a fragmental side elevation of a further modified form of the invention,

Figure 8 is a fragmental end view of the form of the invention .depicted in Figure '7; and,

Figure 9 is a .fragmental side elevation of a furthermodification of the invention.

-Referring "to Figures .1, 2 and 3 of the-drawings,iin which similarreference characters designatacorrespondingparts, it indicates the supporting frame for the various components or units of the printing machine, and portions of this frame are broken away to better illustrate the invention. A web supply or feed roll l! is rotatably supported, in conformity With the usual practice, and a web W is led from the roll Ill through a tension control device 12 of any preferred construction, and through'feed rollers .13 and over guide rollers 55 to the first printing unit lit. The unit it includes an impression cylinder 11 and a cooperating plate or form cylinder 13 ztowhich ink vissupplied from an inking mechanism 20. The inking mechanism 28 may be of any preferred construction, and, in I the present instance, there is depicted a fountain roller 2!, ductor roller 22, ink cylinder 23, distributing'rollers125 and form rollers 23. 'It is to be understood, of course, that theinking mechanism here depicted is typical of a number of preferred-constructions thatmay be employed within the scope of this invention.

The web W is led from the first printing unit 46 around guide rollers 27, through a heating unit 28, and over aguide roller 23, and around a pair of cooling .rollers 33. From the cooling rollers 1-33 the web W is led around'guide rollers 31 to a perfecting printing unit 33, which is the first 'of a plurality .of units for printing on the reverse side of the .web with respect to the side which is printed by -the1printing unit it. The printing :unit 3-2 is similar -.to the printing unit 16 and includes an impression cylinder l'l, plate or form cylinder t8 and inking mechanism 2%, similar to the inking mechanism hereinbefore disclosed. The web W is led from the first perfecting printing unit 32 over a guide roller .33 and through a second perfecting printing unit 31 which is similar -in construction to the printing units it and32. After :passing through the second perfecting printing unit 34,-the web W passes around-guide rollers through a third perfecting printing unit .36 and over a guide roller 3? through a fourth perfecting printing unit 33. The printing units '33 and 38 are similar to the printing units *hereinbefore described. From the fourth perfecting printing unit 33 the web W is led around guide rollers-43, through a second heater 28a, :over a guide roller ti and around a .second set of'cooling rollers 33a.

The Web W in passing around certain of the guide rollers 3|, through the first perfecting printing unit 32, around guide roller 33, through the second perfecting printing unit 34, around guide rollers 35, through the third perfecting printing unit 33, around guide roller 31, through the fourth perfecting printing unit 33, around guide rollers 40, forms a loop L in which the heater 28c, cooling rollers 33a, the impression cylinders of the perfecting printing units and the guide rollers 3!, 33, 35, 31, 43 and 4| are located, and the axes of the printing cylinders, guiderollers and cooling rollers are all arranged in parallelism.

The web after passing around the cooling rollers 33a is trapped within the loop L, and in order to guide the web from this point to any preferred destination, a novel bridge or by-pass 42 is provided which includes a guide roller 43, the axis of which is arranged in parallelism to the axes of the printing cylinders of the perfecting units, and from the roller $3 the Web .passes around an angularly-disposed turner bar 44 and around guide rollers 35 which are positioned to one side of the web W and the axes of which are disposed perpendicular to the axes of the printing cylinders of the perfecting units. From the uppermost guide roller 45, the web W is led around another turner bar 66 .and over :and around guide rollers 41 to the nipping rollers 48 of-a folder 53 of any preferred construction.

In operation, the web W in passing through the printing unit [6 is printed on one sideyan'd the dry or unprinted side of the web engages the guide rollers 27, and the web then passes upwardly through the heater 28.

The heater 28 may be of any commercia'llyeccoptable trpe, but, it ispreferred that an arrangement similar to'that disclosedin the Helmer Patent No. 2,127,956 be employed. It has been discovered that on the application ofintenseheatito printed matter consisting of paper printed with quick drying ink, the period of time required 'to raise the-solvent in the ink to the temperature at which it volatilizes rapidly, and to volatilize substantially all the solvent in the ink, is.materially shorter than the time required to char or burnthe paper. The method of heating the web in the type of heaterdisclosed, consists in drying the printed ink 'bythe application to the printed Web of a heat so intense that it is capable of raising the temperature of the paper far above the scorching point, while, at thesame time, limiting the time of the application of such heat to a period Whichis sufficient to volatilize substantially all of the solvent in the ink and less than the time-required to char or burn the paper. The heat applied may be above the ignition point of the paper or of the ink solvent, so that-at least some of the solvent vapors from the ink isignited and burned, but neither the paper nor *th-e'binder' in the ink isburned or otherwise injured. The heat is preferably applied to the printed surface of the web in the form of hot gas or radiant heat, or most desirably both, and the period'of application of the heat to each part of the surface of the printed web is limited by the relative movement between the heat applying means and the traveling web. 'While the heater per se, aside from its function in the combination, forms no part of the invention, it is preferable that a, heater of this type be employed in this invention.

After the web passes through the heater '28,'it'is trained around the cooling rollers 3 thereby cooling the web preparatory to its perfecting printing operation. The web W is then led around the loop L through the four perfecting units 32, 34, 36 and 38, and, also, through the web bridge or by-pass 42 and to the folder 50.

By this arrangement, after the web passes through the first printing unit IS, the wet or printed side of the web is not engaged until after the web has passed through the heater 28. This is also true in the perfecting printing operation, because here the web is led through the four perfecting printing units, 32, 34, 36 and 38 and the heater 28a and around the intervening guide rollers 33, 35, 31 and 4B, and, also through the bridge or by-pass 42 without the side of the web having undried ink thereon engaging any instrumentality I except the form cylinders of the printing units. Furthermore, the loop or circular lead of the web provides relatively short web leads and also appreciable wrap about the impression cylinders of the printing units and about the intervening guide rollers, to thus insure positive web control during high speed operation. After the web W passes around the cooling rollers 39a of the web loop L it then passes around the bridge or by-pass, and this bridge or by-pass affords ample clearance or space for the web lead between the web guide rollers 35. Without this bridge or by-pass the web would be trapped within the loop. In the present instance, the folder 5D is positioned in alinement with the printing units and the web is led from the bridge or by-pass 42 to the folder in this position, but, it is to be understood that the folder may be otherwise positioned, as will be hereinafter set forth. The cooling rollers and 30a may be of any preferred construction, such as water cooled cylinders, but, inasmuch as the cooling rollers per se form no part of the invention other than their function in the combination, a detailed disclosure of them has not been made in this application.

In the form of the invention disclosed in Figures 4 and 5, the web W is led from the first heater 28 and first cooling rollers 30 over guide rollers 52 to a first perfecting printing unit 32a. From the first perfecting unit 320. the web is led downwardly around a guide roller 53, through a second perfecting printing unit 34a, around guide rollers 54, upwardly through a third perfecting printing unit 35a, around a guide roller 55, and upwardly through a fourth perfecting printing unit 38a, to a guide roller 55, to thus form a web loop L somewhat similar to the loop L hereinbefore disclosed. Here the web would ordinarily be trapped within the loop L but it is guided from the loop by passing it downwardly around an angularly-disposed turner bar 51 and then around two vertically-alined guide rollers 58 which are arranged with their axes perpendicular to the printing cylinders of the perfecting units. From the upper guide roller 53 the web is led through a heater 28b, over a guide roller 6!], around cooling rollers 30b, and finally to a folder 5!). By this arrangement, the web W forms a bridge or by-pass 59 around the portion of the web which leads to the loop L and the heater 28b is positioned above and outside the loop. The folder and heater 28h are positioned at right angles or perpendicular to the web lead of the loop L and the first printing couple of the press. This arrangement may be advantageously employed where ample overhead space is available to conserve valuable floor space, because by positioning the heater above and outside the loop the loop may be condensed longitudinally to thus reduce the overall length of the printing machine. a

Bypassing the web downwardly around the turner bar 51 it is so turned as to pass around the guide rollers 58 with the side of the web that was dried by the heater 28a engaging the rollers to preventsmutting of the freshly printed ink prior to its being dried by passing it through the heater 28b. Thus it is seen, that in this arrangement the web W passes around the entire loop L, through the heater 28b, and to the cooling rollers 30b without the freshly printed ink coming in contact with any instrumentality except the form cylinders of the prefecting printing units 32a, 34a, 36a and 38a.

In the form of the invention disclosed in Figure 6, the web W is led from the first printing unit over guide rollers 60, through a plurality of perfecting printing units, and finally over a guide roller 5| to provide a web loop L From the guide roller 6| the web is led downwardly around an angularly-disposed turner bar 62, upwardly around guide rollers 63, then around an 'angularly-disposed turner bar 65, and finally over guide rollers 66, through a heater 28c, and around cooling rollers 30c. By'this arrangement, the freshly printed side of the web does not engage any instrumentality until it has passed through the heater 28c and has reached the cooling rollers 30c, thus preventing smutting of the web.

This arrangement is somewhat similar to that disclosed in Figures 4 and 5, except that the heater in addition to being positioned above the loop is arranged in alinement with the press lead of the entire printing machine. This arrangement is resorted to where there is' ample overhead space and where a longitudinally condensed loop is desirable.

In the form of the invention disclosed in Figures 7 and 8, the web W is led from the first printing unit or units which prints on the obverse axis disposed perpendicularly to the web run.

From the guide roller 11 the web W is led laterally or perpendicularly past a guide roller 18, and then upwardly around a guide. roller 19, through a heating unit 28d, past a guide roller to cooling rollers 3001. By this arrangement the freshly printed or wet side of the web after passing through the first perfecting printing unit 32d does not engage any instrumentality save the form cylinders of the perfecting printing units until it has passed through the heater 2811 to the. cooling rollers 3541. After passing around the cooling rollers 30d the web W is led around guide rollers 8| to a folder 5!].

By this arrangement the web after passing 'around the loop L is guided perpendicularly to the general web run and upwardly through the heater 28d and finally to the folder 50 which is disposed at right angles or perpendicular to the printing machine. This arrangement is advantageously employed where ample lateral space is available to conserve longitudinal floor space and to afford convenient accessibility to the heatwhere four printing couples are arranged in a web loop, that two of the printin couples are positioned in vertical 'alinement'at onesideof a vertical plane and two in vertical alinementat the opposed side :of the sameplane. The lower units 0f the separate'pairs o'f printing'units are located "insubstantiallythesainehorizontal plane and the upper units are also located in substantially the same horizontal plane. "The impression cylinders "are arranged inwardly 'so that they -are positioned towards or adjacent a wetrical plane located intermediate the pairs of vertically-disiposed couples. In some forms of the invention where there is ample :longitudinal floor space, the folder is positioned in alinement with "the "general :web run, that the *lateral'edges'of the l web leading to the folder are in the same verti- -cal :planes as the lateral edges of the 'portionof 'the web which is guided through the printing units. In other forms of the invention where it :is desirable to conserve longitudinal floor space and where ample lateral space is available, :the folder is disposed'at-right angles-or perpendicular :toithe general web run .so that'the web leading to the folder will 'be at right angles-onperpendicu- Elar to the portion of the Web which is guided through the printingcylinders.

It will be understood that the invention may be embodied in other specific forms without-deaparting from the :spirit or essential attributes thereof, and it is therefore desired that the -.present embodiment be considered in all .respects as illustrative and not restrictive, and it will be further understood that each and every novel featureand combination presentin or possessed .by the mechanism herein disclosed .forms .a part of the invention included in this application.

Having thus described my. invention, what ,I claim asnew and useful is:

1. .In a multi-color web printing machine, a

plurality of printing units through which a Web w inders being in parallelism, and means for leading the web from a location within'the loop around a portion of the loop to a position outside-the loop.

2. In a multi-color web printing machine, a plurality of printing units through which a web is led in a loop formation to print a plurality of impressions on one side of the web, each printing unit including a form cylinder and'an impression cylinder, the axes of the impression 'cylinders being in parallelism, guide rollers 'operably interposed between the printing units and having their axes parallel and also parallel with theaxes of the impression cylinders, the web being'guided around the guide rollers and impression cylinders to form the said loop, a final guide roller positioned within the loop to guide the web,. and means for guiding the web from the final guide roller transversely around a portion or lead 0f the loop to a position outsidethe 100p. 3. In -'a =multi-color web printing machine, a 1

saae aes plurality of printing units throughwhich a web isrle'din a loop formation to print a plurality-of impressions on one:side of 'the web; eachgprintin'g unit including a form cylinder and an impression :cylinder, the axes of the impression cylinders being in parallelism, web drying means, and means for leading the webtransversely from a location within the loop-aroundaportionor lead of the loop to a web gpath outside of the loop, the web passing through the web :drying means subsequent to passing through :the printing units without the freshly printed sideo'f the web :engaging any instrumentality of the machine except the form cylinders until it passes through the said drying-means.

4. In a multi-color web printing machine,a plurality-of printing units to print a plurality of impressions on one :side of the wed-each printing unit including a form cylinder and an impression cylinder, the axes 'of the impressioncylinders being in parallelism,-guide rollers located in predetermined relation to the printing units and having-their axes parallel to theaxes of the impression cylinders offthe printing units and certain of the guide rollers-being operably interposed between the printing units, the'guide rollers and printing units guiding the webin a loop :fo-rrnation through the units with the :impress'ion cylinders of the printing units and the guide rollers which are operably interposed :betweenthe printing units positionedinside thesloop, a final guide roller positioned within the loopto which the web is led, and means for guiding the ZWEb from the final guidemoller within the loop transversely around a-portion or .lead of the loop to a position outside 'the loop.

5. In 'a multi-color web printing machine, a plurality of printing zunits through which a'weo is led in'aloop formation to printa plurality :of impressions on one side of the Web, each printing unit including a form cylinder and an impression cylinder, the axes "of the impression cylinders being in parallelism, guide rollers operably interposed between'the printingunits.andihaving'their axes parallel with each 'other and parallel with the :axes of the impression cylinders, the web be'ingguid'ed around the rollers and around the impression cylinders to form the said loop, a focal guide roller positioned within the loop, a web drying unit including theating means and cooling means, and means for guiding the web from the final guide roller within the loop-transversely around a portion of the loop 'to a position outside the loop, the web passing through the web drying unit subsequent to passing through the printing 'units without the freshly printed side of the web engaging any instrumentality of the machine except the form cylinders until it passes through thesaid web drying unit.

6. In a 'multi-color web printing machine, a plurality of printing units through which a web is led in a loop formation to print several imv press'ions on .one side thereof, each printing unit including-alform cylinder andsan impressionpyl- -inder, the impression cylinders of the said units being within the loop and positioned with their axes in parallelism, ink drying apparatus including heatingand cooling devices, and web turner bars also within the loop, :guide rollers defining the path of the web to the first printing unit, guide rollers cooperating "With the turner "bars to direct the'webangularly :from its path transversely around a lead of "the loop, the web being guided through .the heating device and around the'cooling device subsequent to passing through the, printing units without the freshly printed side of the web engaging any instrumentality of the machine except the form cylinders until it passes through the said heating device.

'7. ,In a multi-color Web printing machine, a group of separate printing units through which a webis led in a loop formation to print several impressions on one side thereof, each unit of the groupbeing independent of other units thereof and each unit including a form cylinder and an impression cylinder, the impression cylinders of the separate units of the group being within the loop and positioned with their axes in parallelism, first guide rollers defining the path of the web to the'first printing unit of the group, second guide rollers interposed between the separate units and defining the path of the web between the units, web turner bars positioned to direct the web angularly from its path away from the loop, and third guide rollers defining the path of the web to an ink drying device, the said secnd and third guide rollers and the said turner bars being positioned to engage only the side of the web that is not printed by the said printing units, the Web being guided through the ink drying device subsequent to passing through the printing units.

8. In a multi-color web printing machine, first and second printing units, one mounted in superposed relation to the other, and with their irnpression cylinders adjacent to a vertical plane, third and fourth printing units, one mounted in superposed relation to the other, and with their impression cylinders adjacentthe said vertical plane, ink drying apparatus including heating and cooling devices, guide rollers defining the path of the web between the printing units, turner bars positioned to direct the web angularly from its path transversely around a portion of the web path, and guide rollers defining the path of the web to the ink drying apparatus, the web path through the printing units and the ink drying apparatus being arranged to bring only the side of the web that is not printed by the said printing units into engagement with any web guiding device.

9 In a multi-color web printing machine, a plurality of printing units through which a web is led in a loop formation to print a plurality of impressions on one side of the loop, each printing unit including a form cylinder and an impression cylinder, the axes of the impression cylinders being in parallelism, a web drying unit disposed perpendicular to the direction of web run of the printing machine and including heating means and cooling means, means for leading the web from a location within the loop transversely around a portion of the loop and perpendicularly from the loop through the said web drying means.

10. In a multi-color web printing machine, a plurality of printing units through which a web is led in a loop formation to print a plurality of impressions on one side of the web, each printing unit including a form cylinder and an impression cylinder, the axes of the impression cylinders being in parallelism, web drying means including a web drying unit and cooling rollers, means for guiding the web from a location within the loop transversely around a portion of the loop to a position outside the loop and then perpendicular with respect to the web run of the printing machine through the web heating unit and around the cooling rollers.

11. In a multi-color web printing machine, a

plurality of printing units through which a web is led in a loop formation to print a plurality of impressions on one side of the web, each printing unit including a form cylinder and an impression cylinder, the axes of the impression cylinders being in parallelism, web drying means including a web heating unit located immediately above the loop and cooling rollers operably positioned at one side of the heating unit, means for guiding the web from a location Within the loop around a portion of the loop to a position outside the loop and then perpendicular with respect to the Web run of the printing machine through the web heating unit and around the cooling rollers.

12. In a multi-color web printing machine, a plurality of printing units through which a web is lead in a loop formation to print a plurality of impressions on one side of the web, each printing unit including a form cylinder and an impression cylinder, the axes of the impression cylinders being in parallelism, guide rollers operably interposed between the printing units and having their axes parallel to each other and parallel to the axes of the impression cylinders, the web being guided around the rollers and the impression cylinders to form the said loop, a final guide roller positioned within the loop and having its axis disposed perpendicular to the axes of the first mentioned guide rollers and the impression cylinders, web drying means including a web heating unit located immediately above the loop and cooling rollers operably positioned at one side of the heating unit, means for guiding the web from the final guide roller within the loop around a portion of the loop to a position outside the loop andthen perpendicular with respect to the web run of the printing machine through the Web heating unit and around the cooling rollers.

13. In a multi-color web printing machine, first and second printing units, one mounted in superposed relation to the other, and with their impression cylinders adjacent to a vertical plane, third and fourth printing units, one mounted in superposed relation to the other, and with their impression cylinders adjacent the said vertical plane, ink drying apparatus including heating and cooling devices mounted transversely to the said vertical plane and above the level of the uppermost printing units, guide rollers defining the path of the web between the printing units, turner bars positioned to direct the web angularly from its path transversely around a portion of the web path, and guide rollers defining the path of the web to the ink drying apparatus, the web path through the printing units and the ink drying apparatus being arranged to bring only the side of the web that is not printed by the said printing units into engagement with any Web guiding device.

14. In a multi-color Web printing machine, a plurality of printing units through which a web is led in a loop formation to print a plurality of impressions on one side of the Web, each printing unit including a form cylinder and an impression cylinder, the axes of the impression cylinders being in parallelism, a web drying um't disposed in alinement with the web run of the printing machine and including heating means and cooling means, means for leading the Web from a location within the loop transversely around a portion of the loop and then in alinem-ent with the web run through the said web drying means.

15. In a multi-color web printing machine, a plurality of printing units through which a web is led in a loopformation to print a plurality of impressions onone side of the web, each printing unit including a form cylinder and an impression cylinder, the axes of the impression cylinders being in parallelism, guide rollers operably interposed between the printing units and having their axes parallel to each other and parallel to the axes of the impression cylinders, the web being guided around the rollers and the impression cylinders to form the said loop, a final guide roller positioned within the loop and having its. axis parallel with the axes of the first mentioned guide rollers and the impression cylinders, web drying means including a web heating unit located in alinement with the web run of the printing machine and cooling rollers operably positioned in alinement with the heating units, means for guiding the web from the final guide roller within the loop transversely around a portion of the loop to a position outside the loop and then in alinement with the Web run of the printing machine through the heating unit and around the cooling rollers.

16. In a multi-color web printing machine, a plurality of printing units through which a web is led in a loop formation, ink drying mechanism located within the loop and through which the web is led, and means for guiding the web after it leaves the ink drying mechanism transversely around a portion of the loop to a point outside the loop.

17. In a multi-color Web printing machine, a plurality of printing units through which a web is led in loop formation to print plurality of impressions on one side of the web, each printing unit including a form cylinder and an impresslon cylinder, the axes of the impression cylinders being in parallelism, a final guide roller positioned within the loop with its axis parallel to the axes of the'impression cylinders, ink drying mechanism located within the loop, means for leading the web within the loop through the ink drying mechanism to the final guide roller, and means for guiding the web from the final guide roller transversely around a portion of the loop to a position outside the loop.

18. In a multi-color web printing machine, a plurality of printing units through which a web is led in a loop formation to print a plurality of impressions on one side of the web, each printing unit including a form cylinder and an impression cylinder, the axes of the impression cylinders being in parallelism, a final guide roller positioned within the loop with its axis parallel to the axes of the impression cylniders, web drying mechanism located Within the loop and including a web heating unit and coolnig rollers, means for leading the Web within the loop through the web heating unit and around the cooling rollers to the final guide roller, and means for guiding the web from the final guide roller around a portion of the loop to a position ou side the loop.

19; In a multi-color web printing machine, a plurality of printing units through which a web is led in aloop formation to print a plurality of impressions on one side of the web, each printing unit including a form cylinder and an impression cylinder, the axes of the impression cylinders being in parallelism, a final guide roller positioned within the loop with its axisparallel to the axes of the impression cylinders, webd'rying mechanism located within theloop and including a web heating unit and cooling rollers; means for leading the web within the loop through the web heating unit and around the cooling rollers to the final-guide roller, and means for guiding the web from the final guide roller around a portion of the loopto aposition'out side the loop, the lateral edges of-the loopand the web lead which is within the loopbeing in the same vertical planes.

20. In a multi-color web printing machine, a plurality of printing units through which a web is led in a loop formation to-print' several impressions on one side thereof; each printing unit including a form cylinder and an impression cylinder, the impression cylinders of the said units being within the loop and positioned with their axes in parallelism, ink drying apparatus including heating and cooling devices and web turner bars also within the loop, guide rollers defining the path of the web, tothe first printing unit, guide rollers defining the pathof the web through the ink drying apparatus and coop crating with the turner bars to direct the web angularly from its path around the-loop and to one side of the machine. 1

21. In a multi-color web printing machine; a plurality of printing units through which" a web is led in a loop formation to print severalimpressionsv on one side thereof, each unit includinga form cylinder and an impression cylinder; theimpression cylinders of-the said units being within the loop and positioned withtheir axesin parallelism, first guide rollers defining thepath of the web tothe first printing unit, second-guiderollers defining the path of 'the web between the units, web turner bars positioned to direct the web angularly from its paththrough the said units, and third guide rollers defining the: path of the web to an ink drying device, the said second and third'guide-rollers and the said-turner bars being positioned to engage onlythe side of the web that is not. printed by the said pri'nti'ng units.

22. In a multi-color' webprinting machine, first and'second printing units, one mounted in: superposed relation to theother, and; withtheir impression cylinders adjacent to a vertical'plane; third andv fourth printing units, onemountedinsuperposed relation to theother and with, their impression cylinders adjacent the-said vertical: plane, ink. drying apparatus including heating;

and cooling devices mounted transversely to the, said vertical plane and above the level of; the uppermost printing units, guide rollers defining the path of the web between the printingunits, turner bars positionedto direct the-webangnlarly from its path-through the Said-'units andguide:

rollers defining thepath of the web to the ink drying apparatus, theweb path: through the printing units and the ink; dryingapparatusbea ing arranged to bringonly the side of the web. that is not printed bythe-saidprinting units into engagement with any webguiding device.

ADOLPH" M; ZUCKERMANI

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