US595525A - cohen - Google Patents

Description

(No Model.) 8 S heetsSheet 1.

O. H. COHEN 8: S. MARK. MACHINE FOR TAKING PRINTS FROM PREPARED LITHOGRAPHIG STONES.

3 m W i; 4, M M Mm m w w m m P (No Model.) 8 Sheets-Sheet 2.

C. H. COHEN & S. MARK. MACHINE FOR TAKING PRINTS FROM PREPARED LITHOGRAPHIG STONES.

No. 595,525. Patented Dec 14,1897.

g s ikw mue 5 as'mmffblen Witnesses 8 Sheets-Sheet 3.

(No Model.)

.0. H. COHEN 85 SL MARK. MACHINE FOR TAKING PRINTS FROM PREPARED LITHOGRAPHIG STONES.

No. 595,525. PatentedDeo. 14, 1897.

m wses Tn: Nonms PETERS ca. ncwaumm WASHINGTON, n c

(No Model.) a sheet s shet 4.

' C. H. COHEN 8a S. MARK.

MACHINE FOR TAKING PRINTS PROM PREPARED LITHOGRAPHIG STONES. No. 595,525. Ratented Dec. 14, 1897.

Q h s S g x M F- m V a r 0' m "8 @F 22 1105555 [rm 671123715 (No Model.) 8 Sheets-Sheet 5.

0.1-1. COHEN & S. MARK. MACHINE FOR TAKING PRINTS FROM PREPARED LITHOGRAPHIO STONES.

No. 595,525. Patented Dec. 14, 1897.

m: wams vzrzns co, Pnotau'mm wAwmGYUN, n K.

(No Model.) 8 Sheets-Sheet 6.

; 0, H. .OOHEN & s. MARK.

MACHINE- FOR TAKING PRINTS PROM BREPARED LITHOGRAPHIG -STONES.

No.595,525. Patented Deb.14,1897.

(No Model.) I s Sheets-Sheet 7. 0.11. O0HEN'& S. MARK.

MACHINE FOR TAKING PRINTS PROM PREPARED LITHOGRAPHIO STONES.

155595525. Patented Dec. 14, 1897.

Wibmnses r if fizvm'zlors is co. PHOTO-LUNG wAsmnerou n a.

(No Model.) 8 Sheets-Sheet 8.

0,115. COHEN & S. MARK. MACHINE FOR TAKING PRINTS FROM PREPARED LIPTHOGRAPHIG STONES.

No. 595,525 Patented Deb. 14, 1897.

Wit RM I g M 1 m 16 .7 v C. flggzue mlv r NITED STATES PATENT rrrc.

COSMAN HENRY COHEN AND SAMUEL MARK, OF LONDON, ENGLAND; SAID MARK ASSIGNORTO SAID COHEN.

MACHINE FOR TAKING PRINTS FROM PREPARED LlTHOGRAPHIC STONES.-

SPECIFICATION forming part of Letters Patent No. 59 5,525, dated December 14, 1897. Application filed September 19, 1896- Serial No. 606,480. (No model.)

To all whom, it may concern.-

Be it known that we, COSMAN HENRY COHEN and SAMUEL MARK, subjects of the Queen of Great. Britain, residing at London, England,

have invented a certain new and useful improved machine for taking prints or impressions from prepared lithographic stones, engraved blocks, and the like and setting off such prints or impressions upon glass, wood,

IO and other rigid substances; and We do hereby declare that the following is a full, clear,

and exact description of the invention,which.

will enable others skilled in the art to which it apper'tains to make "and use the same.

This invention consists of the improved machine hereinafter described for taking prints or impressions in pigments or inks ,or other materials from prepared lithographic stones, engraved blocks, and the like and setting oif such prints or impressions upon sheets of glass, panels of wood, earthenware, tiles, bricks, and other articles having plane surfaces and consisting of substances too rigid for properly receiving direct prints or im- 2 5 pressions from lithographic stones, engraved blocks, and the like, the object of the said invention being to insure the production of superior results with rapidity and facility.

The said improved machine consists of a 0 frame suitably formed for supporting or holding in the required positions a receptacle for the required pigment or ink or other print ing material, and a slab or plate or table (hereinafter termed the distributing-table) on 3 5 which the said pigment or ink or other print ing material (hereinafter termed the ink) is distributed, and a prepared lithographic stone or engraved block or the like (hereinafter termed the design) from which the 0 print or impression for setting off is to be taken, and a support for the article on which the print or impression obtained from the design is to be set off, which support is hereinaftertermed the feed-table and is provided 5 with means for insuring the'placing of the said article (hereinafter termed the work) in the required posit-ion, and (where lithographic stones are to be used) an appliance of the kind ordinarily used for damping,

5o (hereinafter termed the damping-table,) all of which parts are stationary. The means for receiving the impression from the design and setting off the said impression on the work consists of a cylinder faced with a suitable elastic or yielding material and mounted in a suitable carriage supported by and workin g on the frame of the machine, the arrangement of the said carriage being such as to admit of the said cylinder being moved to and fro over the design and the work and of ro- 6o tating while being moved in one direction.

Figure 1 of the accompanying drawings is a side elevation, Fig. 2 is a plan, and Fig. 3 is an end elevation, of the said improved machine, certain parts being omitted, as hereinafter stated. Fig. 3 is a longitudinal section on the line X X, Fig. 2, the portion of the machine shown by the said section being that which .is below the said line in the said Fig. 2. Figs. 4, 5, 6, 7, 8, 9, 10, 11, and 12 represent portions of the said machine drawn to a larger scale than the said Figs. 1, 2, 3, and 3, Fig. 4 being a transverse section of part-of the machine, taken on the line A, Fig. 1; Fig. 5, a section taken on the line B, Fig. 4; Fig. 6, a detail hereinafter referred to; Fig. 7, a side View of parts of the machine; Fig. 8, a plan View of the same parts; Fig. 9, a section taken on the line C, Fig. 8; Fig. 10, a plan of the ratchet side of the ink-duct end of the machine; Fig. 11, an elevation of the said end; and Fig. 12, a section taken on the line D, Fig. 2, looking in the direction of the upper side of that figure.

In the following description the said drawings are referred to by the letters marked thereon. I

The same letters of reference indicate the same parts in all the said figures.

a a a a are the main parts of the frame 0 of the machine, which is shown as resting on girders b b.

c is the slab or plate or table on which the ink is distributed. d is the support for the design. e is the feed-table or support for the 5 work or article on which the impression received from the design is to be set off, andf is the damping-table. The said parts'c 61 cf are supported by bearers a 0 secured to the end frames a a and to a transverse frame a,

which is connected at its lower parts only to the lower parts of the side frames a a. By-

thus supporting the said parts d e f unobstructed spaces are left between them and the side frames a a, in which spaces certain of the moving parts hereinafter described work. The height of the parts (I e is capable of adjustment by means of screw-actuated wedge-blocks (1* (1* e 6*, situated between them, and frames (1 e, in which they respectively rest and which are secured to the said bearers a (0.

(Z d are screwed rods by means of which the wed ge-blocks (1* (1* of the design-support d are adjusted, and e is a screwed red by means of which the wedge-blocks 0* 0* of the feed-table e are adjusted.

A convenient arrangement for insuring accurate lay of the work where impressions from several designs are required to be set off on the same plate or slab is illustrated on the feed-table in Fig. 2. The said arrangement consists of stops 2 e secured near the edge of the said table which is farthest from the attendant and projecting above the face thereof, against which stops one edge of the work is to be placed, and of a stop 6 secured at right angles to the stops (2 c for one of the adjacent edges of the work to bear against, which step e consists of a strip of metal or other suitable material having holes in it the positions of which correspond with those of several series of holes 6 e in the table e. Ready placing of the work in the required position and ready alteration of the position of the stop 6 according to the size of work in hand are thus provided for.

9 g y 9 are the parts of the duct or trough for containing the ink to be applied to the design, and g is the roller (herein termed the duct-roller) by which the contents of the said duct are withdrawn, the said duct-roller 9' being formed and arranged and fitted and supported by and secured to the side frames a a as in ordinary lithographic printing-machines.

h is a pawl carried bya hand-lever h, and

'h is a ratchet. by which pawl and ratchet the duet-roller g is rotated to effect withdrawal of the contents of the duct g. The said pawl and ratchet, which are arranged and act in the ordinary manner, are actuated during the working of the machine by means of the connections hereinafter described.

'i is the cylinder, by means of which the impression is received from the design when charged with ink and by means of which the said impression is set off on the work, the said cylinder being formed of metal and affixed to a shaft 1 and havinga facing of suitable yielding material secured to it by ordinary or other convenient means, which are not illustrated and do not need description. The carriage supporting the said cylinder 2 consists of a pair of frames 2' 1' respectively mounted and capable of traveling on slides a a, formed on the side frames (1 a of the machine. The said frames 2' i have slots 1' 1' formed in them for reception of the spindles of the damping-rollers and the inkingrollers, and in the said frames "6 2' are mounted sliding brasses i in which the bearing parts of the cylinder-shaft 2" work, the said brasses being pressed downward by means of strong springs, one of which is shown at i in Figs. 1 and 3*.

t i are screws by means of which the degree of compression of the said springs may be regulated according to requirements.

j j are toothed wheels which travel on racks 70 is, affixed to the lower parts of the inner sides of the parts a a of the machine-frame, and Z Z are racks on the cylinder-carriage, with which racks the said wheelsj 7' gear and thus impart reciprocatory motion to the cylinder-carriage.

In order to plainly show the positions of the racks k 7c Z Z, portions of the framing of the machine are represented broken away in Figs. 1 and 3.

m is the driving-shaft of the machine, from which shaft the wheelsjj are actuated through the medium of pinions, one of which is shown at n in Figs. 1 and 3, and toothed wheels 0 0, gearing with the said pinions and rods 0 0, connected to crank-pins on the wheels 0 0 and to the axle of the traveling wheels j j, the weight of the said rods 0 0' being balanced by counterpoises secured to the wheels 0 0, as shown at o 0 Figs. 1 and 3. said wheels 0 0 are mounted in plumberblocks secured to bearers supported by the end frame a of the machine and by the transverse frame a one of the said blocks and one of the bearers supporting them being shown in Figs. 1 and 3 and marked, respectively, 0 0

1) q are toothed wheels on the cylinder-shaft 2 the wheel 13 being loose on the said shaft and the wheel q being keyed thereto.

0 0" are racks secured to the frames d e, in which the parts at e are mounted, with which racks the wheels 1) g respectively gear, and by so gearing normally cause rotation of the said cylinder during motion of its carriage in the direction indicated by the arrow in Fig. 1, which is the forward motion and is produced by the engagement of the wheels j j, which travel on the racks 7t 7a, with the racks ll on the cylinder-carriage. The length of the racks 7o 70 and a r and the diameters of the wheels 0 0 j j p q bear such relation to each other that the cylinder 1 is caused to travel from the position shown in Figs. 1, 2, and 3 to the forward edge of the feed-table 0 during one-half rotation of the wheel 0 and is caused to rotate twice while so traveling, one rotation of the said cylinder being performed while it is passing over the design (during which rotation the impression from the design is received on the said cylinder) and the second rotation being performed while the cylinder is passing over the feed-table 6, during which rotation the impression received on the cylinder is set off on the work supported by the said table.

The

gagement of a pawl 19, mounted on a pin 19*,

carried by the said wheel p, with one face of a projection 2' formed onthe said cylinder 6, which pawl is normally maintained in its acting position by a spring 19 and during the greater part of the forward motion of the said carriage rotatory motion is also communicated to the said cylinder by the wheel g, which is keyed to the shaft of the said cylinder and gears with the rack 4"; but during a portion of the said motion of the said carriage the said wheel q does not communicate motion to the cylinder, the reason being that the teeth at one part of its periphery are cut away, as shown in Fig. 9, for the purpose of admitting of non-rotation of the cylinder when necessary, as hereinafter explained.

Fig. 6 is a separate view of the pawl 13 and the parts carried by it, which are hereinafter described, the said pawl being shown in the said Fig. 6 in the same position as in Fig. 4:.

The mechanism whereby non-rotation'of' the cylinder during forward motion of its carriage is provided for consists of a pin 19", carried by the free end of the pawl 10 and passing through a slot 19 in the said wheel and projecting beyond the outer face thereof, the outer end of which. pin carries a roller 19 which is brought once during each rotation of the wheel 13 immediately over a lever 8, carrying a roller 8 and affixed to a rocking shaft 3 working in the sliding frames 1? t constituting the cylinder-carriage. The said lever s is normally supported in the position illustrated in Fig. 5 by the bar If, on which the said roller 8 rests, which bar 25 is carried by arms 25 t, jointed at their lower ends to the frames d e, in which the tables d e are mounted, and is connected by a link i (see Figs. 1 and 2) to a cranked handle-lever i mounted at the feed end of the machine and provided with an ordinary locking-catch. By depression of the said handle-lever the bar If and the lever s are raised, which lever then stands in the path ofmotion of the roller 1)", the effect being that when the said roller is brought by rotation of the wheel 10 to the position shown in Fig. 5 the pawl 19, carrying the said roller, is disengaged from the projection 13 on the cylinder, which is then out of gear with the wheel 19 and ceases to rotate withit. At the time when this action takes placet'. e. when the pawl 19 is disengaged from the projection i by contact with the lever s-the toothed wheel g at the opposite end of the cylindershaft is in the position shown in Fig. 9. Consequently the said wheel cannot communicate .motion to the cylinder, and any motion of the in a bracket '0 secured to the part 11 of the cylinderwcarriage, which lever 12 and rod 1; are normally kept in the positions shown in Fig. 7 by springs '0 t but'by engagement of an arm 3 on the rocking shaft .9 with a finger 0 secured to the hooked lever o, the latter is raised into the path of motion of the said stud 'Lt simultaneously with the rising of the lever s at the other side of the machine, the rising of which lever is due, as hereinbefore stated, to .the rising of the bar i when the cranked handle-lever t at the feed end of the machine is actuated.

The object of the spring 2: is to prevent possibilityof fracture of parts of the mechanism being caused by too sudden stoppage of rotation of the cylinder 2', the action of the said spring 12 beingto admit of slight continuance of rotation of the said cylinder and other parts carried by the shaft 1; after the stop to has become engaged with the hook at the free end of the lever 'u, and then to cause reverse rotation of the said parts until the rod 4), to which the said lever 11 is connected, is brought back to its normal position. (Shown in Fig. 7.)

As it is important that rotation of the cylinder be arrested when the wheel q is in such a position relatively to the rack 0* that the teeth of the said wheel shall be entirely clear.

in a bracket t aftixed'to the part 2' of the cylinder-carriage. To admit'of adjustment of the degree of friction produced by the said brake a screw-thread it is formed on its stem u, and lock-nuts n a are engaged with the said screw-thread, the lower of which nuts bears on the actuating-spring u. By variation of position of thesaid nuts 11, n the required adjustment may be effected.

With the object of limiting the reverse motion or recoil of the cylinder 1' and wheel q when arrested by the stop t, already described, (which recoil. would or might cause engagement of the teeth of the wheel q and rack 7',) another stop acting in the opposite direction is provided, which other stop consists of a rod 10, mounted and capable of up-and-down motion in the bracket 2' and pressed upward by a spring wand carrying at its upper end a roller 10 against which the curved face of the projection 11/ on the outer face of the drum to bears, (thereby depressing the rod 20 and compressing the spring w,) when by rotation of the cylinder-shaft 2" the said projection a is being carried over the roller w Immediately the said projection of has passed over the said roller 10 the rod to carrying it is forced upward by the spring 20', and the said roller then stands in the position shown in Fig. 7 and thus limits the recoil or backward rotation of the cylinder-shaft 11 and the wheel (1 and other parts carried by the said shaft.

From the foregoing it Will be seen that the stop mechanism described with reference to and illustrated in Figs. 4, 5, 7, 8, and 9 of the drawings admits of the cylinder-carriage being moved forward and backward without rotation of the cylinder and also enables the attendant at the feed end of the machine to prevent or arrest rotation of the cylinder without stopping the machine when the toothed wheels 1) q, carried by the cylinder-shaft i, are in the positions represented in Figs. 5, 7, and 9, which are their positions both when the cylinder-carriage has completed its backward motion and is on the point of returning and when it has completed one-half of its forward traverse, the cylinder having in the latter case completed one forward rotation, during which it has received the impression from the design, and being on the point of commencing a second forward rotation, during which the impression so received will be set off on the work. It will thus be seen that if before the said second forward rotation begins the attendant should have been unable to place the work in the position required for properly receiving the impression, or if for any other reason it be desirable that the impression should not be set off on the work during the continued forward motion of the cylinder, the said second rotation of the cylinder and the consequent setting off of the impression on the work may be prevented by depression of the cranked handle-lever 25 the cylinder being then by the continued motion of the machine carried over the work without rotating and without coming in contact with it.

\V hen the cylinder-carriage i i arrives at the end of its forward stroke after setting off on the work the impression received from the design, the wheel (1 comes to rest in the position shown in Fig. 9, and during the return motion of the cylinder-carriage the consequent reversal of direction of rotation of the wheel 1) causes the pawl 17 to be carried past the projection i on the cylinder without engagement therewith. Therefore the cylinder does not rotate while its carriage is moving back to the position shown in Figs. 1 and 2, but is carried over the feed-table and the design without touching them.

The means provided for raising the rollers mounted in the cylinder-carriage out of their acting position when necessary are as follows: The damping-rollers are prevented from coming in contact with the distributing-table c and the feed-table c by bars 0 c and e e at the outer sides of the said tables, which bars are situated in the paths of motion of runners carried by the spindles of the said rollers and cause them to rise when passing over the said tables. The inking-rollers are normally kept out of contact with the dampingt-able f and feed-table e by means of bars a; w, on which runners carried by the spindles of the said rollers travel. The bearing-faces of the said bars being of greater height at the parts adjacent to the said tables than at their rearward parts, as shown in Fig. 1, the said rollers when traveling over them are carried clear of the said tables; but while the said bars 00 at are in the position shown in said Fig. 1 (which is their normal position) the said rollers when traveling over the lower parts of them are in position to receive ink from the distributing-table and to charge the design therewith. To provide for the inkingrollers carried by the cylinder-carriage being kept out of their acting position when the machine is required to be run solely for the purpose of causing action of the receiving and distributing rollers, each of the bars (090 is mounted on a set of cranked levers, one set of which levers is illustrated in Fig. 1 and marked 0: 00 09 the levers 00 00 being jointed to the frame of the machine and the levers being affixed to a rocking shaft on, crossing the machine, as illustrated in Fig. 2, and the two sets of levers are respectively connected by rods, one of which is illustrated in Fig. 1 and marked a and the said rod 00 is connected to a cranked handle-leveroc at the feed end of the machine, which lever when raised is retained in position bya projection or stop at the upper part of a segment 00 secured to the side frame a, and when depressed is retained in position by engagement with a recess at the lower part of the said segment. By means of the said lever 00 the bars 00 a." may be retained in their normal position, as shown in said Fig. 1, or be raised to such a height above the said position as to cause the inking-rollers mounted in the cylindercarriage to pass over the design and the feedtable without touching or acting thereon.

The receiving-roller and the distributingrollers are mounted in a carriage consisting of a pair of frames 31 respectively mounted on the slides a a, on which the cylinder-carriage works, to which frames reciprocatory motion is imparted from the axle of the wheels j j through the medium of connecting-rods 3 y and y y and levers 11 By this means the extent of traverse of the said carriage is limited to the portion of the machine where action of the rollers carried by it is required. 3 is the receiving-roller, which is carried by arms g 1 secured to a rocking shaft y, working in the frames 1/ y. In orderto cause the said roller 3 to become thoroughly charged with ink from the duct-roller g, guides g g are mounted below the said ductroller g, on which guides runners g g on the shaft of the roller 1 travel when the carriage 3 is completing its backward motion and beginning its advance motion. The arrangement of the said guides is fully illustrated in Figs. 10, 11, and 12 of the accompanying drawings. Asshown in the said figures, each of the said guides g g is supported by coiled springs g g g, placed around pins 9 g 9 working in sockets formed on a support 9 which also forms the support for the inkduct, and each of the said guides g g is further supported or steadied by means of a pin .9 engaged with a slot 9 and having a nut g screwed on its end. By means of the said guides g g the receiving-roller g is caused to travel round a considerable portion of the charged surface of the duct-roller g and is at the same time pressed forcibly into contact therewith and thus becomes effectually charged with ink. The distributing-rollers, which are not shown in the drawings, are supported by engagement of the end portions of their spindles with the slots 3 1.1 of the frames 1 y. 11 (see Fig. 12) is a stop which limits the downward motion of the receivingroller (L1 Those of the parts hereinbefore referred to, and marked 9 y" g 1 which would be partly seen from the feed end of the machine are not illustratedin Fig. 3, in order that the parts illustrated in the said figure may be the more clearly seen. I

' By mounting the receiving and distributing rollers in a carriage separate from the cylinder-carriage and actuating the rollercarriage as described the traverse of the'said rollers is limited to the portion of the machine where they are required to act-i. 6., between the ink-duct and the forward edge of the distributing-table. Consequently access to the design is not impeded bythe workin g of the roller-carriage or of the rollers carried by it.

The ink-duct is of ordinary construction that is to say, it consists of a trough open at one side, the roller 9 being arranged at the open side of the said trough, as usual, for carrying the ink from the duct as required. The said trough is formed of a base part g, faced on its upper side by a spring-plate 9 the position of the lower edge of which relatively to the roller 9 is adjusted according to requirements by means of screws 9 9 The sides of the trough consist of plates g g, secured to the base 9 by screws 9 9 the forward edges of which plates 9 g enter grooves 9* g* in the roller g, as shown in Figs. 2 and 10. The mechanism by which motion is communicated to the ratchet-pawl h of the duct-roller g is best shown in Fig. 1. The

said mechanism consists of a lever I2 jointed to the bearer o and carrying an antifrictionroller situated in the path of motion of a cam 0 on the shaft of the toothed wheels 0 0,which lever is kept in contact with the said cam and shaft by means of a spring h* (see Fig. 3 and is connected through the medium of rods h 71 and a cranked shaft it to a slotted lever h loosely mounted on the end of the duct-roller g. By means of this arrangement the lever h is raised and lowered at each revolution of the shaft carrying the cam 0 the said lever during its rising motion actuating the ductroller 9' through the medium of the ratchet 71 and pawl h by bearing against the jointpin h of the said pawl, which joint-pin proj ects over the said lever 77. b is a stop which limits the motion of the lever h when thrown backward. Facility and nicety of adjustment of the extent of motion of the ductroller at each stroke of the machine are provided for by. means of a screw h carried by a bracket g secured to the part 9 supporting the duct, the end of which screw stands in the path of motion of a projection h on the lower part of the hand-lever h and limits the extent of the backward or return motion of the ratchet-pawl h, carried by the said lever h. Adjustment of the extent of rotation of the d uct-roller at each forward motion of the ratchet is also provided for by means of the slot in the lever h m m are fast and loose band-pulleys on the driving-shaft m. The mechanism for shifting the driving-band from one to the other of the said pulleys by the operator when standing at the feed end of the machine consists of a shaft m carrying at the feed end a hand-lever m and at the rear end a lever m which is connected to a belt-shifter of ordinary form, consisting of a bar m mounted and capable of sliding in staples m m and carrying arms m m between which the driving-band works. m is a fly-wheel on the said driving-shaft m. 1

The mode of using the machine and its action are hereinafter described.

When the machine is required, to be run I solely for the purpose of effecting proper distribution of ink on the table 0, the handlelevers w and t are depressed in order to admit of to-and-fro motion of the cylinder-carriage without rotation of the cylinder and without action of the inking-rollers mounted in the said carriage. Assuming that the ink has been properly distributed on the table 0 and that the design is secured in the required position on the support (1 and that the parts of the machine are in their normal positions,

as described with reference to and illustrated in Figs. 1, 2,and 3, the action and use of the machine during regular or ordinary working are as follows: On motion being communicated to the driving-shaft m the cylinder-carriage i '5 iscaused to advance toward the feed end of the machine through the medium of the gearing hereinbefore described, the cylinder rotating while the said carriage advances. During the first rotation of the cylinder it passes over the design and receives the impression therefrom. During the second rotation of the said cylinder it passes over the work (which has been previously placed by the attendant in the requisite position on the feed-table e) and sets off thereon the impression which it received from the design, and during the two rotations of the cylinder the damping and inking rollers pass over the design and damp it and deposit ink thereon and the damping-rollers pass over the damping-table f. lVhile these actions are taking place the duct-roller g is partially turned by the mechanism actuated by the cam 0 on the shaft of the driving-wheels 0 0, and ink is transferred from the said duct-roller to the distributing-table c by the roller 3 in consequence of the motion of the roller-carriage y, which while the cylinder-carriage Z is advancing is drawn forward, but at a slower speed and to a less distance than the said cylinder-carriage, the extent of traverse of the said roller-carriage being only suificient to cause the distributing-rollers mounted in it to act on the distributing-table c and to cause the roller f to deposit on the said table the ink received from the duct-roller g. After the cylinder-carriage has arrived at the extremity of its forward stroke the continued motion of the driving mechanism causes it and the roller-carriage y to begin their return motions, when the following actions take place: During the return of the roller-carriage the distributing-rollers mounted therein again act on the ink on the distributing-table c and the roller y is driven under the ductroller g and receives therefrom a fresh charge of ink. During the return motion of the cylinder-carriage the cylinder 1' does not rotate, the reason being as herein before stated. The said cylinder is therefore carried back without rotation to the position in which it is shown in Figs. 1 and 2,and while being so carried back the damping-rollers again pass over the dam ping-table and the inking-rollers again pass over the design and the distributing-table. Meanwhile the attendant removes from the stationary feed-table c the work on which the impression was set off during the forward motion of the cylinder and places on the said table fresh work (another slab or sheet) ready to receive the set-off from the cylinder when it next advances over the feed-table. hen the next advance motion of the cylinder-carriage begins, the pawl p, which was automatically disengaged from the projection i on the cylinder during its return motion, again engages with the said projection and causes rotation of the cylinder, as before. In ordinary circumstances the actions described are continuously repeated during the whole time of working; but if it be desirable for any reason to prevent rotation of the cylinder while it is advancing this is effected by depression of the handle-lever t whereby the mechanism governed by the said lever is actuated and the effects hereinbefore described as consequent on actuation of the said mechanism are produced.

\Vhat we claim as our invention is 1. In a machine of the character herein described, for taking prints or impressions from prepared lithographic stones,en graved blocks and the like and setting off such prints or impressions upon glass or other rigid material, the combination of a plate 0 on which the ink is distributed, a support cl for the design, a feed-table e to support the work or material on which an impression from the design is to be set off, a damping-table f, the said parts 0, d, e and f being stationary and all supported in substantially the same horizontal plane, the rotatable cylinder 1' for conveying an impression from the inked design to the work, a traveling carriage in which said cylinder is mounted, automatically-controlled mechanism for actuating the said cylinder and its carriage in such manner that the cylinder will normally rotate while its carriage travels forward over the stationary design and stationary work and travel back without rotating, and lever mechanism for controlling the cylinder to prevent its rotation on forward movement, substantially as set forth.

2. In amachine of the character herein described, for taking prints or impressions from prepared lithographic stones,engraved blocks and the like and setting oif such prints or impressions upon glass or other rigid material, the combination of a plate 0 on which the ink is distributed, a support d for the design, a feed-table e to support the work, a dampingtable f, the said parts being stationary and the supports (1 and 6 being provided with means for vertical adjustment, the cont-rollably-rotatable cylinder *6 for conveying an impression from the inked design to the work, a traveling carriage in which said cylinder is mounted, ink-rollers mounted in a separate carriage, automaticallycontrolled mechanism for actuating the said cylinder and its carriage in such manner that the cylinder will normally rotate only while its carriage travels forward over the stationary design and stationary work, and lever mechanism for controlling the said cylinder to prevent its rotation on said forward movement, substantially as set forth.

COSMAN HENRY COHEN. SAMUEL MARK.

Images