US42125A - Improvement in - Google Patents

Description

UNITED; STATES@- PATENT FFIG@l J. W. HLS'l-BBE, 0F'BOSTON,MASSAOHUSETTS.

IMPROVEMENT lNfLlTl-lOGFtPHlCLPPiINTING YPRESSES?F Specification forming'part of *Letters Patentv No: 42, 125, dated March 29, 1864.

and uscfulImprovcments in Presses for Lithographic and Zinc Printing,.of whichthe following is a full, clear, and exact-description,

reference being had to they accompanying drawings, making part of this specification, vin which- Figure 1 is a perspective view of myim-` Fig. 2 is a central .longitudinal proved press. section through the same with the carriagein a different position; Fig. 3, a longitudinal section through the scrapereaudbar to which itis' attached, showingthefmanner.I in vwhich it is pivoted; Fig. 4, detail showing Ithe wheels C and E as viewed from Athe .interior of the machine;` Fig. 5, 'detail showing the method of raising and lowering the table O.

The object of this invention is to perform4 the several operations of moisteningand yinl;- ing the lstone or plate of zincA and of taking the impression nponthe paper, all by means of improvedautomatic machinery, the construction and operationof which-I will now proceed to describe in such terms thatothers skilled in the art may understand and .usemy invention.

In the accompanyingy drawings, A is the.` l

(See Fig. 5.)

frame-work of the machine, in suitable bear ings in which is supported theshaft'of the'.

driving-wheel B, which engages` with thecogwheel C upon the shaft D. Upon this shaftl is also secured another wheel, E, similar to 0,

excepting that one-half of its circumference is not provided with teeth, as seen in Figs. land.

4. The teeth of this wheel :E engage with-the teeth of a gear, F, on a short shaft, a, (seen. dotted in Figs. 1 andv 4,) which has` its beary ings in the frame-work andfcarriesat its oppo-A site endy a sprocket-wheel, b, over which Aand a similar sprocketwheel,c, on -the yend of a roll, G, is stretchedthe chain/d. Over this roll G and twootherrolls, H vandf-I, aref the roll tand another roll, x, is stretched an yendless-"band of deer-skin, cloth, or vother i suitable material D', which` takes waterfrom the roll s, and carries -it forward for thepurf -pose of ymoistening thestone, the upper roll, t,;being regulated bythe screws u, so as tof press out anyeXcess -of water. The roll :c

stretched the tympans JK, of leather or otherY suitable material, and 'these rolls are caused-- to revolve together bythe chains e, which pass over sprocket-wheelsf. y The rolls Gr' H Ihave theirbearings in theframe-work A. -The chains 1 'e are connected together by flat strips of metal4 g, to which the tympans are riveted; and also by rods 9, over which the, other endsof the f tympans are stretched, and by thus attaching the tympans to the chains any tendency of the tympansito slip on the frollslis vprevented,while it also insures the-proper'surface motion required by the `traverse. of the carriage.- The spring-nippers, of which there ris one set foreach tympan, are seen-.at It, and are-operated by rods i, which have'their-bear-ly ings in ears projectingfromthe chains e, andA are. providedwith tappets 10,:which strikeA .againsttheprojcctions jij as the chain rc- 'volves, andthus open the nippersat therequired points, the nippers being closed at other times by coiled springs on the rods i.

"Lis a carriage,.which is pivoted at 7c to the frame-work, and is vibrated back and forth by the connecting-rod M, secured to a crank, yN,

on the shaft-D. At the upper part of this cari riage is the bed O, for supporting the stone or vother material, P, on which is the design to be printed.. This bed is madeadjustable,to accommodate stones of varying thickness by means of the screws 1,(one at each corner,) which are permanently secured to the bed'O,

f and are raised and lowered-by means of nuts an, having teeth cut on theirperipheries, in

whichwork the worms n, which -are furnished at one end with cranks o, connectcdtogetherf by a bar, p, to whichthe handle q= is attached.

face simultaneously.

y I will now describe the apparatus by whichv thestone is damped or moistened previous yto beinginked.

f is a boX- or -trouglnsecuredin the framework and-partially filledl with-water, in which'. i

revolves Va roll, Vs. Above this roll 8f is a -similarro1l, t, which' is forced down\ontothe vrolls bymeans of a screw, `u, ateach-nend, and.L is driven'by'a cord, c, vfastened Vto 4thecarriageL, andfpassing'ovcrrolls w, running on studs projecting from the framework;- Over This v arrangement enables me,l :after the stone is once placedv in theffproper position, to raise or lower all points of its sur-v consists of an iron shaft covered with wood, and over this is stretched a cylinder of rubber or other soft material. The ink is contained within the trough Q, from which it is transferred by rolls R and Sto the distributingcylinders 'l by which the ink-rolls y are served, and in contact with these latter the stone passes twice, once as it advances and again as it returns. The roll R is driven by a cord, z, from the main shaft D. As the ink is liable to be deteriorated by absorbing moisture from the stone, I have placed distributingtables U V on either side of the stone, which receive the ink as they pass under the inkrolls, and thus expose it to the atmosphere on an extended surface, by which means the moisture is partially evaporated at each traverse of "the carriage, and the ink is more evenly distributed. These tables U and V are hinged at one end, so as to afford access to the parts beneath. The ledges c serve as cams to press the ink-rolls y up into contact with the distributing-cylinders T when they are not engaged in inking the stone.

I will now describe the method by which the tympan is carried down by the scraper,77 so as 1o bring the paper into contact with the stone for the purpose of receiving` the impression.

W is a longitudinal bar, sliding in guides I," in each side of the frame-work. carries the scraper c', which ts in a groove, and is pivoted at the center, as seen in Figs. 2 and 3, so as to adapt itself to the stone in a lateral direction, and is adjusted by means of the screw d', to which it is pivoted. To the bar W is attached, ,on each side of the machine, a rod, X, furnished at its lower `end with two rollers, c', between which passes a lever, Y, pivoted at f to the frame-work. The levers Y (one on each side of the machine) are provided attheir outer ends with rolls g', which are acted upon by the cams h on the main shaft D, and thus as the cams h revolve the j har W, with the scraper and tympan, is brought down as required, a-nd the lever Y assumes a horizontal position. As soon as the cams It cease to act upon the rolls g', the levers Y are raised by the springs i and assume theirformer position, raising the scraper up fromthe tympan. The form of the cams h is such that when the rolls g travel from l to2 the scraper is suddenly depressed, while passing i'roin2 to 3 the scraper holds the tympan and paper against the upper surface ofthe stone, and when passing from 3 to 4 the levers Y, and scraper connected therewith are raised by the springs i. It is evident that the distance from f to 7c in the levers Ybein g one-half the distance from k to gl, the distance to which the scraper is raisedisalso but one-half the throw of the,

cams-h. When a stone is used whose surface is curved instead of flat, the curved faces of the cams h are varied, as indicated by the red line, Fig. 2, so as to cause the scraper to press the tympan and paper against thestone with uniformpressure.4 The cams h maybe replaced by others of different sizes and having different bearingsurfaces, so as to correspond with the length of stone employed, and thus prevent the scraper from carrying the tympan down past the edge of the stone, which would be liable to crack and injure the tympan. As the tympan is required to remain stationary while the carriage L is being moved in the direction of the arrow 5, the wheel E, which engages with the gear F and sets the tympan in motion, as before stated,is constructed with teeth on one-half of its periphery only, being that portion encompassed by the red line, Fig. 2, and seen more clearly in Figs. l and 4. This wheel is so adjusted on the shaft D that its teeth shall engage with the gear F only after the carriage has completed its traverse in the direction of the arrow 5, and commences to move in the opposite direction to bring the stone into position to give the impressiom As soon as the tympans commence to move, the paper, which is fed into the nippers h by the attendant,is carried round beneath the scraper and into contact with the stone, so as to receive the impression, after which it is carried around until the tympan is arrested at the point 6, Fig. 2. On the next movement of the tympan the nippers are opened by the tappet l'comin g into contact with the projection j', when the paper falls, printed side up, onto the receivingtable Z, which is hinged to the framework at l', so as to allow it to be raised to ai'ord convenient access to the-carriage beneath.

A is a frame composed of strips of metal,

and is hinged to the frame-work at m', and e serves to guide the paper onto the rcceivin gtable, and also to prevent it from falling out. The paper is prevented from coming in contact with the damping apparatus by guides n. (Seen in section, Fig. 2.)

l have heretofore spoken of two tympans only as being used, but by extending tl1e'dis tance between the rolls Gr H I three or more tympans may be employed, thus lessenin g their liability to heat in proportion to the number used by allowing one to cool while the others are in use, each tympan being furnished with a set of nippers, l.

B is a box corresponding in width to the tympans, and placed contiguous to their interior surface, which is llcd with greased cotton waste, so as to keepit lubricated, and

thus allow the edge of the scraper to run smoothly over it. of the tympans to become heated, and prevents them from tearing.

The printed sheets are caused to fall one i on the top ot' the other on the receiving-table in the following manner: C is a metallic plate i attached to the table Z, and is inclined thereto, as seen in Fig. 2, so as to form a shoulder at 0, the sheets as they fall passing over this shoulder into the space p', formed betwee it and the ledge at the bottom of the table. The sheet falling from the nippers, being guided by the It also lessens the liability frame A, is thus prevented from striking the edges of those already on the table, and the sheets are laid one over the other until the space pf is full, when they are removed by the attendant. Y

Operation: The parts being in the position represented in Fig. 2, the carriage L is caused to move in the direction of the arrow 5 through the connections explained, the stone being moistened by the band D as it passes the roll The stone next passes under the inking-rolls y, by which it is inked. During this period (or while the carriage is moving in the direction of the arrow 5) the tympan on which the paper is placed remains stationary, the toothless portion of the wheel E being opposite the gear F. As soon, however, as the carriage L starts to return, the portion of the wheel E provided with teeth, having arrived in a position to engage with the gear F, the tympan through the connections explained commences to revolve, carrying with it the paper, which has been before fed into the nippers. When the forward part of the stone P reaches a position immediately beneath the scraper C', the paper will have arrived at the proper point for commencing the impression, and the scraper G (through the before-mentioned connectionslis depressed, causing the tympan to bring the paper uniformly against the design upon the stone duringits traverse. The tympan continues to revolve, carrying with it the printed paper until it arrives at the point 6, when it is arrested, as before stated. On the next movement of the tympan the paper is carried around by the nippers until they are opened by the tappet coming in contact with the projection j', when the paper f lls, as before stated, printed side up, onto the receiving table Z, being guided by the frame A. As soon as the paper commences to leave the stone, the latter commences to be damped,

and on the return of the carriage the stone is damped a second time, the process of damping and inkin g the stone being twice repeated before each impression, excepting the rst time, when it is damped but once and inked twice.

What I claim as my invention, and desire to sccure by Letters Patent, is-

l. 111 combination with a carriage, L, that supports the bed O, and that vibrates in the arc of a circle, a jointed scraper, C', that is actuated in a line `radial to that are, substant'aly as described.

2. Raising and lowering the bed O by means of screws and wormgears, or heir equivalents,

substantially as set forth, for the purpose specified.

3. The removable cams h', the form ofV which is made to correspond with the surface ofthe stone or zinc, whether it be curved or at, for the purpose of pressing the scraper uniformly onto the stone during its traverse, and of such a width of bearing-surface that the scraper will be held down a length of time corresponding to the length of the stone, substantially as set forth.

4. rIhe revolving tympans J K, and nippers h, in combination with the rolls GH I, when said tympans serve thepurpose and are used in lieu of a roller or platen, and operatin g substantially as set forth,for the purpose specified.

5. Revolving the tympans which move under the heavy pressure of a scraper, and are used without a roller or platen to give pressure by means of chains and sprocket-wheels, substantially as set forth.

6. Themethod, substantially as described, of combining and attaching the tympan and nippers to and operating them by means ofthe chains e, for the purpose set forth.

7. The employment of two or more revolving tympans, when used without a rollerl or platen, to give pressure, and two or more sets of nippers as set forth, for the purpose described.

8. Disengaging the printed sheet from the nippers at such a time during the revolution of the tympan that it will fall, printed side up, onto the receivingtable, in the manner substantially as set forth.

9. The swinging receiving-table, Z, with its inclined plate C', in combination with the framefA, for the purpose of laying the printed sheets one on top of the other, substantially as described.

10. The endless band D', in combination with the rolls s t m and trough r, for the purpose of damping the stone or zinc, substantial] y as set forth.

11. The grease-box B', for the purpose of I lubricating the interior surface of the tympans, substantially as described.

12.' The distributingtables U and V, in combination with the ink-distributing cylinders T and ink rolls y, for the purpose of evaporatin g the superfluous moisture absorbed by the ink, Substantially as set forth.

' J. WM. H. STUBBE.

Witnesses P. E. TEscHEMAcnER, N. W. SrEARNs.

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