US2235250A - Coating machine for printers' rollers - Google Patents

Description

March 18, 1941- G. BINGHAM E TAL 2,235,250

COATING MACHINE FOR PRINTERS ROLLERS Filed May 2, 193a 4 Sheets-Sheet 1 R I Carl 6 fiz'igg/zazzz Pazzl frzze/res w WdZz'a/ro lf amzei Gig 2,45.

March 4 c. G. BINGHAM ET'AL 35, 50

COATING MACHINE FOR PRINTERS ROLLERS Filed May 2, 1938 4 Sheets-Sheet 2 March 18, 1941. c, BMGHAM ETAL 2,235,250

COATING MACHINE FOR PRINTERS ROLLERS Filed May 2, 1938 4 Sheets-Sheet s March 18, 1941. c. G. BINGHAM ETAL 5 COATING MACHINE FOR PRINTERS ROLLERS -Filed May 2, 1938 i 4 Sheets-Sheet 4 Patented 'Mar. 18, 1941 UNITED ST TES f COATING MAOHINE FOR PRINTERS v. ROLLERS" Carl G. Bingham, Highland Park, Paul Fernekes. 1

. Arlington Heights, and vWilliam Wanner,

Wilmette, Ill.,.assignors to Sam! Binghams Son Manufacturing Company, Chicago,,lll., a cor-.

poration of Illinois --Applicati on May 2. 1938, Serial No. 205,502

f llz' Claims.

This invention relates to improvements in coating machines for printers rollers. I g

One object of the invention is to provide a coating machine of the type mentionedby means of which a single roller may be coated or a plurality of such rollers will be coated under the same conditions as to temperature and viscosity of the composition and other factors affecting uniform-,

ity of the finished coats. v A

Another object of the invention'is to provide improved means for rotatinga single roller or a plurality of rollers, as well as improved mechanism for feeding the pan or composition applying means uniformly and without chatter or vibration during the coating operations to avoid formation of ripples or other imperfections in the roller supporting and driving mechanism," and carriage for the composition applicator and of associated structures; r

Fig. 3 is a sectional view taken on line 3-3 of Fig. 2 illustrating details of an adjustable rollsupporting means; t

Fig. 4 is a section on 1ines4-4 of Fig. 2, showing details of the carriage, particularly means for.

efiecting driving engagement of the same with and disengagement from operating means therefor;

Fig. 5 is a section taken on line 5-'-5 of Fig. ;3 of a vertically adjustable applicator supporting means; i i

Fig. 6 is a perspective view of the driving mechanism;

Fig. 7 is a sectional view'taken on line 1'l'of Fig. 6 illustrating means for interrupting ;the movement ofthe carriageautomatically at the end of a coating operation;

Fig. 8 is a sectional view on line 8-8 of Fig. 6 of a driven roll-supporting spindle;

' Fig. 9 is a detached sectional'view'of a supplementaryspindle for 'use with rolls provided with relatively short projecting core or shaft ends;

of the invention are to Fig. 10 is a broken sectional view of the o'm position heating tank; V

Fig. 11 is a verticallongitudinal section through the applicator illustrated in Fig; 2-showing details'thereof;

Fig. 12 is a section taken'transversely of the machine and illustrating the dual-roll coating applicator; shown 1;

Fig. 13 is a. broken elevation of the dual roller supporting bracket-shown in Fig l;

Fig. 14 is a section taken online A l-14 of Fig.11;

Fig. 15 is a broken sectionalview taken on line l5-l50fFig. 12 and Fig. 16 1s a perspective view of a detachedJgate. for controlling the flow of hot coating composition through an applicator outlet. v

As shown in Fig. '1 of the drawings, theimprove ments may be embodied in a roller coating-machine comprising an inclined guide indicated generally by the numeral H), a housing II on which the lower end of the guide maybe attached; a. hollow pillar or post l2 which supports the forward end of the guide and a bed, l3; upon which, the above mentioned members are mounted. .1 On the guide I!) an adjustable roller supporting bracket 14 is mounted for rotatably supporting the upper ends of a roller or rollers to be coated, While the lower ends of such roller or'rollers "are mounted in driven spindles I5 and lli journaled in an inclined wall Ila of the casing llv and rotated by driving mechanism within the casing. The mechanism in the casing, to be described more in detail hereinafter, operates a pump l'l which circulates hot composition material from a tank l8 upwardly through pipe l9, through a flexible hose 20 for discharge into a composition applicator member or pan indicated generally by the numeral 2|, which'pan is movable by a car-. riage 22 supported by and movable longitudinally of the guide l0. Thepan 2| maybe of a type forv coating a'single roller, as shown in Fig. 2 of the drawings, or it may be designed for coating more than one roller, as shown in Figs. land 12.

The guide 10 may comprise a conventional I- beam, as shown in Fig. 12, on the, upper'flange of which a smooth and trued stationary guiding plate or track'llla preferably is secured. i v

The carriage 22, in the form illustrated, com-. prises a vertical plate 22a and upper and lower horizontal flanges or plates 22?) and 220, the former being arranged to slide upon the guide plate lUa and the latter being disposed beneath the lower flange of the guide 10.; Mounted ,on the plateflb of the carriage for transverse ad justment with reference thereto is a plate 23 which is slotted as at 23a for accommodating a threaded clamping member 24 whereby the plate and pan can be adjusted transversely of the guide l into proper position with respect to a roller or rollers supported by the bracket l4 and the spindles I or l5 and [6. Transverse guide strips 22d guide the plate 23 during lateral adjustment thereof. A pan supporting bracket 26' is secured to the plate 23 as by threaded studs- Since it is desirable that a pan used for 21. coating rollers simultaneously be so supported as to cause a cross-current of the composition; for

reasons hereinafter explained, the member-23 may be secured to plate 23. in such wiseas'to provide for a slight cocking or tilting thereof and of a pan carried thereby. For example, a threaded stud 28 may be provided in member 25 whereby the latter can be tilted slightly, the openings in plate 23 through which studs 21 passbeingsufficiently large to accommodate such movement. This arrangement enables thebra'cket to be adjusted readily for effecting the disposition of a Wall 2611. of the bracket in a vertical plane or in a plane inclined to the vertical. to the wall 26a of the bracket 26is a stationary portion 29 of an adjusting mechanism by means of which a pan or coating. applicator may be adjusted vertically. The member 29 carries an adjusting screw. 33 which passes through a threaded recess 3| in a clamping member 32 which is adapted to, be clamped around a tubular neck or stem Zia of the pan- 2! to which thehose 20 is attached. The pan may be detachably secured to the stem 21a by a set screw 2lb, as

shown in Fig. 15. Adjustment of the screw 33 in one direction or the other will raise or lower the pan 2|, the member 32 beingslidably secured to the member 29 by a dovetail rib 29a, as shown-in Figs. 2 and 5.

The carriage 22 has also mounted on its upper flange a hand operable lever 33 which is pivoted at 33a to a pair of ears 33b. The lever 33, as shown in Fig. 4, is of the bell crank type and has a laterally extending arm 330, the free end of which is in engagement with a releasable latch operating member 34 as by extending into a slot 34a of said member. The member 34 can be vertically reciprocated by operation of the lever 33, as will'be seen. A locking dog or tooth 35 is carried by the member 34 beneath the top plate 222) of the carriage andmay be moved into locking engagement with teeth of a-gear 36 carried by a short shaft 31 which is journaled in a member 33which in turn is secured to the plate 22b of the carriage. The gear 38 is rotatable within a recess 38a formed in the member 38 and a chain sprocket 39 is -mounted on the shaft 31 in another recess38b in the member 38, the

shaft 31 being journaled in the wall intermediateof movement. of the carriage 22 and. passes through a recess38b of. the member 38:into. en-

gagement' with the sprocket 39', while: the lower.

Secured run 41b of the chain is disposed below the member 38. When the locking tooth or dog 35 is in the upper position shown by full lines in Fig. 4, the upper run 3la of the chain may rotate the sprocket 39, the shaft 31, and the pinion or gear 36 without efiecting longitudinal movement of the carriage. as will be seen. Should the lever 33 be moved clockwise from the position shown v in Fig. 4 to lower the latch operating member 34 and move the locking member 35 into engagement with the gear 36 to lock the same against .rotation, movement of the upper run 4| of the chain; which, asgstated, engages the teeth of the sprocket 39, will move the carriage longitudinal'ly of. the. guide ID, as from the initial starting position adjacent the upper end of a rollerto be coated to the lower end thereof. When the lower position has been reached, the lever- 33 may be swung counterclockwise manually, asviewed in Fig. 4, to release the driving engagement of the drive chain with the carriage and thus halt further movement of the carriage, notwithstanding that the chain continues to operate. To. preclude damaging the machine should an operator'neglect to release the carriage at the endof the coating operation; adjacent th-lowerend' of the guide ID, as shown in Fig. '7, there is provided a member 42 provided with an inclinedsurface 43 disposed in the path of travel of thememiber' 34 whereby as the carriage reaches. the dotted line position shown in Fig. '7, the surface 43 willhaveengagedjthe lower end'of the member 34- and shifted-the same upwardly,-t hereby releasing the dog- 35 from the gear 36 and halting further downward movement of'the carriage. This feature constitutes a safety provision should the operator neglect to shift the lever 33 as the carriage completes its downward stroke.

The-roller supporting bracket [4 is provided with a top plate Ma which extends'transversely of the wear plate Illa; ofthe-guide and is provided' at the rear end thereof with a threaded clamp lever- 44 by means of which thebracket may be firmly secured to the guide H) in any longitudinally adjirs'tedposition; A threaded adjusting screw45 is providedfor raising or lowering an arm 46 of the member I4 which carries one or more pairs of anti-friction rolls 41, each pair of'which is arranged tosupport the upper end of a shaft or'core of a printer's roller to be coated; The pair ofroll 41 shown in Figs. 1 and 2 is supported by a bracket armfl filz andis arranged to support a printersroller A in alignment with the driving spindle l5. Asshown in Figs. 1 and 13, the arm is provided with a second pair of anti-friction rolls-41a which may support asecond printe'rsroller 3 in" alignment with thedriving spindle l6. Where two rollers are to be coated simultaneously, the outer roller B, while disposed parallel with the roller A is located with its axis at a slightlylower elevation than the axis of the roller A- for the purpose above referred to and to be described hereinafter. The spindle l6, therefore, is located'in a position slightly lower than spindle l5, while the rolls 41a are. located slightly lower than" the rolls '41.

The driving mechanismwithimthe casing ll preferably comprises anxelectric motor. 48.which; by. means of speed reducing mechanism 49, drives a gear 50 which initurn drives age'ar 5| mounted ona shaft. 52; Also'mounted. on-a' shaft 52 is a cluster: of; gears indicated. by thenumerals 53 which; in conjunction with'asecond' cluster of gears 54, constitute a transmission mechanism. The gear cluster 54 is shiftable alonga shaft55 onrwhich the gears are mounted for effecting different rates of rotation of a shaft 55a, on which is mounted a sprocket 56. The shaft 55a is driven through a universal connection 55b due to the fact that the shaft 55a; is arranged parallel with the inclined spindles l5 and I6. The shaft 55a may be journaled at the forward end in a bearing (not shown) supported by a wall of the casing. Around the sprocket 56 and sprockets 5! and 58, the latter two of which a e mounted respectively on inclined shafts 59 and 69, is a chain 6| which thus drives the roller rotating spindles or socket members [5 and I6. The shafts 59 and 60 are carried by suitable journals or bearings 59a and 600;, respectively, which-may be mounted on the rear of the inclined wall Ila of the casing. An idler sprocket 63is shown in engagement with the chain 60 for keeping the same under proper tension. Where the .machine is .designed for coating 2. single roller, the spindle |6 is omitted, in which case the drive chain 60 will pass around only the sprockets 56 and 51' for operating the spindle l5.

For varying'the rate of rotation of the spindle l5 or spindles l5 and I6, where both are employed, and consequently of the roller or rollers to be coated, a gear shift mechanism of conventional form and indicated by the numeral 63 may be provided and is operable by a lever 65 located on the outer wall of the casing H as shown in Fig 1. A clutch mechanism, also of conventional form andindicated by the numeral 65, may likewise be provided and is operable from the outside of the casing by a lever 61, also shown in-Fig. 1. The shaft 55 is provided with a sprocket 68 which drives a chain 69 which passes around a drive sprocket 10 of a second speed reducing member 1| provided with a driven sprocket 12 over which the feed chain 4| passes and by means of which it is driven. By the drive mechanism shown, varying the rate of rotation of the spindles by the gear shift mechanism varies in a definite ratio the movement of the carriage.

The upper and lower runs Ala. and Mb of the chain pass through openings on the inclined wall I l a of the casing and over idler sprockets 1 3 and 14, respectively, which are shown as being mounted in a suitable bracket 15 attached to the inner surface of the wall Ila of the casing. The spindles l5 and I6 preferably are of the form shown in Fig; 8, where the spindle I5 is shown in longitudinal section. As therein illustrated, the spindle is shown as provided with a conical recess |5a into which may be inserted the lowerend of a roller shaft or core. Supplementary spindles [5' of the type shown in Fig. 9 may be used in coating rollers having relatively short projecting core ends. By screwing a supplementary spindle l5 into one of the others, the lower end of the body of the roller supported thereby will be spaced sufliciently from the casing I so that the coating operation will be completed. by the applicator before interruption of the downward movement thereof by member 42. The conical surface |5a and also the corresponding conical socket or spindle l6 center the rollers with respect to the spindles and accommodate roller shafts of different diameter while the rolls 4! and lla/support the upper ends of the roller shafts or cores in parallelism with reference to the direction of travel of the pan or coating applicator 2| as the latter is moved downwardly opposite end as at 8| to the pillar.

by' the carriage 22, itbeing understood that by adjusting the screw 45' of the member l4, the rollers ll! and 41a can be'raised or lowered as may be necessary in effecting such parallel disposition of the roller shafts or cores.

In coatingone or two rollers with the present improvements, the rollers are placed in their respective positions shown in Fig. 1 after the carriage 22 has been moved manually to an upper positionadjacent the journaling bracket [4. Hot coating" composition in the tank I8 is drawn through a pipe l8a by the pump ll which is driven by a shaft Ila, and forced upwardly through the pipe l9, through the hose 2!. and hollow stem 2|a of a pan 2|. The composition fiowsinto the applicator and overflows therefrom into a trough Hi from which it is directed back into the tank IS. The composition supplied to theapplicator, as iswell known, is in excess of that required for merely coating the rollers and surplus composition'overflows the rear walls of the pan .andthence into the trough 16, I

When the temperature of the composition flowing through the pipe I9 and intothe pan 2| is proper for the best results, as indicated by a thermometer 11, for example, the clutch ,lever 16 is shifted, whereupon the spindles l5 and. I6

are rotated at a rate dependent upon the setting thus moves downwardly from a position at the 1 upper ends of the rollers A and B throughout the length of their coatable surfaces. At the completion of the coating operation, the lever 33 is thrown manually to drive-releasing position or it is moved to that position automatically by the engagement of the member 34 with the inclined surface 43 of the automatic releasing device 42. V,

In order to avoid irregular or chattering movement of the carriage 42 during the coating stroke thereof, means are provided for preventing play between the interengaging teeth of the sprocket 39 with the links of the chain 4|. In the form of the invention shown, a chain 18 has one end attached to the carriage 22 and extends upwardly along the upper surface of the guide member through a slot '19 in the bracket l4, around an idler roller at the upper end of the supporting pillar I2, and is attached at the A counterweight 82 is supported by the chain within the pillar [2, asshown in Fig; 1, and constantly maintainssuflicient tension on the chain 18 to prevent play between the coacting links of the chain 4| and the teeth of the sprocket 39. The arrangement described assures the uniform nonchattering movement of the carriage during its in the jacket 84 whereby'the composition in the tank proper isv maintained at a proper temperature. A screen or like foraminous member 85 is provided below the level of the composition in the tank and through which passes the composition returned by the trough 16. The screen retains bubbles formed in'the: returned liquid until they break since if permitted to be carried around to the applicator 2|, they would bethe cause of slight imperfections in the finished coating. The outlet pipe l8a is provided with an interiorly threaded intake lBb, as shown in Fig. 10, through which the composition flows to the pump II. In order tofiush out the composition..material which may'remain in the pipeline and the pump, a tube or standpipe 86 is provided which may be screwed into the threaded opening of the member I811. Hot water orother solvent may be then poured into theupper end of the tube 86 which extends above the level of the composition in the tank, and by the operation of the driving mechanism, the pumpwill force the water up through the pipe l9, tube 20, and flush out the coating composition that may have remained therein.

The specific forms of applicator 2| shown inFigs. 1, 2, 11 and-12 preferably are formed as castings or they may be fabricated of sheet metal. The single roller coating type shown in Figs. 2 and 11 differsfrom the multiple roller coating type Shown in Figs. 1 and 12 merely in the size or length thereof and in that thelatter is provided with two'semi-circularrecesses in the front and rear walls ofthe twosections thereof which accommodate the printers rollers. The forward wall of each type, whether the single or multiple rollercoating type, is provided at the margins of the semi-circular recess or recesses therein with rubber dams 87 which embrace the respective rollers closely to prevent downward flow of thecomposition material along the roller in advance of the applicator, Since the usual coating compositioncongeals quickly, any downward flow of the-material-along the'roller will form irregularities in the finished-coating.

' As stated above, the applicatoris flooded with the coatingmaterial during the coating operation, the surplus overflowing at the rear edge for reasons well known in the art. The a licator shown herein is provided, however, with an overflow port 88'communicating with a passage 89 which returns the overflowing material to the trough 16. The object of -the overflow 88 is to create a cross-current of hot liquid from the intake side thereof to said outlet so as to prevent retention of a localized body of composition material in the applicator for such length'of time as will enable it to congeal. With applicators of the former type not having such overflow to induce a cross-current of hotmaterial throughout the lengthof the applicator, it has been found that not infrequently, thematerial at the side of the pan remote from the-intake, that is, the lefthancl side as viewed in Fig. 12, does not circulate but remains in the pan and becomes 7 partially congealed during the coating operation, and portions of such congealed composition material when liberated are carried to the roller and form lumps or imperfections in the finished coat. By means of the constant overflow of the fluid composition during the coating operation-this cause of imperfect rollers has been obviated since the-material is free to flow lengthwise of the pan from the" intake to theoverflow side thereof, and-thus congelation oripartial congelation of the liquid in the applicator at thegrside remote from the intake is avoided; To induce the .free flow of the liquid through. the .overflow passage 89, the passage preferably communicates, as by an extension 90, with theatmosphere, .the upper end of which is at alevel above the normal level of the liquid in thepan during .the coating operation.

For the purpose of facilitating the flow of composition material from the intake end to the opposite end of. the. applicator. and thereby avoid undesirable temperature variations in the composition. within the pan and consequent variations in the viscosity thereof and to enable the regulation ofthe level of the composition in the coating. sections of the applicator, the latter preferably is inclined from the intake to the opposite end thereof, as. illustrated in Figs. 1 and 12. For this reason, the roller B, that is, the roller more remote from the intake end of the applicator, is located at a slightly lower level than roller A. Consequently, spindle I6 is at a lower elevation than spindle l5, and rolls 41a are correspondingly lowerthan rolls 41.

A sheet metal gate 9!, shown in perspective in Fig; 16, and having an arm 9la which engages a rear wall of the applicator, may be utilized for .varyingthe area of the overflow opening as may be desirable. Such gates 9| are shown in position inFigs. 11, 12 and 14. In addition to theuse of a gate at the overflow opening, where a. dual'or multipleapplicator is being employed, a second gate 92 isemployed between the rollers as shown in Fig. 12. By using a gate 9| at the overflow opening of either the single or the multiple roller applicator and a second gate 92 between the rollers in an applicator of the latter type as shown in Fig. 12, the level of the composition in the applicators can be so regulated as to obtain the most satisfactory results under varying operating conditions. Since variation in the level of .the'roller-co'ntacting composition in the applicator tends to vary the smoothness of the applied coating, it is desirable to maintain the level in the coating sections of the applicator at the same height with respect to the respective rollers being coated to procure uniform resultsfi Hence, in coating a plurality of rollers simultaneously, suitable means such as a gate orv gates 92 are employed to so impede the flow of composition material from an upper to a lower coatingsection of they inclined applicator that the level of the composition in the sections will be uniform with reference to the respective rollers; By means of the gates, the level of the composition in the applicator can therefore be varied within desirable limits for controlling the smoothness of the applied coating under difierent rates of rotation of the spindles and velocity of movement of the carriage, and under temperature or other conditions affecting the viscosity of the-coating composition.

The gates 9l-and 92 preferably are so shaped at their lower ends as to be incapable of obstructing completely the flow of composition through the outlet ports or from one roller coating section of the multiple roller coating applicator to a lower section.

With theapparatus shown and described, a single roller may be coated, in which. case an applicator of the type shown in Figs. 2 and 11 preferably is used, while if it is desired to coat a' plurality of rollers simultaneously to assure of maximun'iuniformity i n the coating, an applicator of the type shown in Fig. 1 is employed.

While the preferred embodiment of the invention has been shown and described, it will be apparent that various changes in details may be resorted to without departing from the spirit of the invention as defined by the appended claims.

1. A machine for simultaneously coating a pair of printers rollers comprising rotary means for supporting the rollers parallel inclined position at different elevations and rotating the rollers while in such position, coating applying means having a section for each of said rollers, an inclined guide for guiding said applying means longitudinally of said rollers from the upper to the lower ends of the coatable surfaces thereof, means for so moving said applying means, means for supplying coating composition continuously to said sections of said applying means during the coating operation and means for maintaining the composition in said sections a at equivalent levels relatively to the respective rollers. r

2. A machine for coating a pair of printers rollers simultaneously comprising means for rotatably supporting said rollers in parallel relation but at different elevations, an inclined applicator provided with a discharge opening at the lower end and movable longitudinally beneath the rollers provided with walls partially enclosing the rollers for applying coating composition thereto, and means for supplying composition continuously to said applicator at the higher end thereof during the coating operation and in substantial excess of that required for coating the rollers whereby a current of said composition flows continuously through the applicator from the upper to the lower end thereof and through said discharge opening during the coating operation.

3. A machine for coating a plurality of printers rollers simultaneously comprising rotatable means for supporting said rollers in parallel relation, an applicator movable longitudinally of the rollers during rotation thereof for applying coating composition to the rollers, means comprising an intake for supplying coating composi-.

tion to said applicator continuously during the coating operation, and means for supporting said applicator in an inclined position for facilitating the flow of the composition from the intake transversely of the applicator for effecting the uniform coating of said rollers.

4. A machine for coating printers rollers comprising an inclined guide provided with means for rotatably supporting the upper end or ends of one or more printers rollers, rotatable drive means adjacent the lower end of the guide for supporting the lower end or ends of said roller or rollers and rotating the same, a carriage movable longitudinally of said guide throughout the length of the coatable surface of said roller or rollers and parallel with the latter and comprising a composition applicator receptacle, means for supplying coating composition to said receptacle for application thereby to said roller or rollers during movement of the same 1ongi releasably'attachable to said carriage for moving thelatter and said receptacle'longitudinally of. said roller or rollers during the coating operation, a rotary sprocket carried by: said carriage and meshing with said chain, and means. for latching the sprocket against rotation for causing the chain to move guide.

5. A machine for coating printers rollers'comprising rotary members for supporting the ends of one or'more rollers in parallel and inclined position, means for rotating said rollers, a composition applicator beneath said rollers and partially enclosing the same for applying coat-J ing material thereto, means for supplying composition material to the applicatonmeans for moving said applicator lengthwise of the rollers from the upper to the lower ends of the coatable' surfaces'thereof during the rotation of the same,-

and tensioning means resisting said movement of the applicator for inhibiting the development of chattering action therein during the coating operation. r

6. A machine for coating printers rollers comprising an inclined guide, upper and lower rotary members for supporting the respective core ends of apair of parallel rollers to be coated, means for rotating certain of said rotary members for rotating the rollers supported thereby, a movable carriage on said guide comprising a composition applicator for v applying composition to said rollers, an endless chain provided with one run thereof supported for movement in a direction parallel with the movement of said carriage, a latchable pinion for effectinga driving engagement of said carriage with a link of said run for moving said carriage downwardly along said guide during thecoating operation and means acting against the downward movement of said carriage for retaining said pinion against relative movement with respect to an engaged link of the chain.

7. A machine for coating printers rollers comprising an inclined guide, upper and lower rotary members for supporting the respective core ends of a pair of parallel rollers to be coated, means for rotating certain of said members for rotating the rollers supported thereby, a movable carriage on said guide comprising a composition applicator for applying composition to said rollers, an endless flexible driving member having a run thereof disposed parallel with the direction of movement of said carriage, latchable rotary means on said carriage for efiecting a driving engagement of said flexible member with said carriage for moving the same and said applicator along said guide during the coating operation, and means for unlatching said rotary means for releasing said carriage from engagement with said flexible member at the end of the coating operation.

8. A machine for coating printers rollers comprising an inclined guide, upper and lower rotary members for supporting the respective core ends of a roller o-r rollers to becoated, means for rotating said roller or rollers during the coating operation, a movable carriage supported by said guide provided with a composition applicator movable along the roller or rollers, driving means for said carriage comprising an endless chain having one run thereof disposed parallel with the direction of movement of said carriage, means for effecting a driving engagement of said carriage with said run comprising a latchtudinallyof said guide, aflexible driven chain said carriage along said able sprocket on said carriage disposed in meshingirelationwith the linksof said'chain, andmeansfor latching said sprocketagainstrotation to effect movement of the carriage and applicator' along'said guide during thecoating opera. tion.

9. A machine for coating printers rollers com-- prising an inclined guide, upper and lowerrotary members for supporting the respective corelends of a roller or rollers to be coated, means for rotating said roller or rollers during the-coating operation, a movable carriage supported by said guide provided with a composition applicator movable along the roller or rollers, driving means for said carriage comprising an endless chain having: one run thereof disposed parallel with thedirection of movement of said'carriaga means for effecting adriving engagement of said carriage with said run comprisinga latchable sprocketon said carriage disposed-in meshing relation withthe links of said chain, means forv latching" said sprocket against rotation to efiect movement of the carriage and applicator along said guide during the coating operation, and means adjacent the lower end of said guide for efiec'ting the automatic release of said sprocketand interrupting the downward movement of the carriage.

10. A machine for coating a pair of printers rollers simultaneouslycomprising an applicator having communicating coat applying sections for the rollers to be coated,'means for support tion, and adjustable means for maintaining the composition at predeterminedlevels in each of said sections.

11. A machine for coating a pair of printers rollers-simultaneously comprising an applicator having communicating coat applying sections for the rollersto be coated, means for supporting the rollers in parallel-relation, means for rotating said rollers, means for moving the applicator longitudinally of the rollers during the coating operation; a composition inlet in one of said sections. for supplying composition to both sections, a composition o-utlet'in the other section, and independently adjustable flow control members one between said sections and the other at said outlet for maintaining the composition at a predetermined level in each section.-

12. A machine-for coating a pair of printers rollers simultaneously comprising-means for rotatably supporting saidrollers in parallel relation butat different elevations, an inclined applicator provided with a discharge opening at the lower end and movable longitudinally beneath the-rollers and provided-with walls partially enclosing the rollers for applying coating composition thereto, means for supplying. coating composition; continuously to said applicator at the higher end thereof during the coating operation andin substantial excess of that required for coating the rollers whereby a current of composition fio-ws continuously through the applicator from the upper to the lower end thereof and through said discharge opening during the coatingoperation, and adjustable means for regulating the flow of composition-material through said discharge opening for controlling the level of material in said applicator.

, CARL'G. BINGI-IAM.

PAUL FERNEKES. WILLIAM WANNER.

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