US86064A - Improvement in printing-presses - Google Patents

Description

UNTTED T nTEs PATENT OEEIGE.

VALTER II. FORBUSH, OF BUFFALO, NEW YORK.

IMPROVEMENT IN PRINTING-PRESSES.

Specification forming part of Letters Patent No. 86,0611, dated January 19, 1869.

To all whom it may concern:

Be it known that I, WALTER H. FoRBUsH, ofthe cityof Buft`alo,county of Erie, and State of N ew York, have invented certain new and useful Improvements in Printing-Presses 5 and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying dra-wings, making a part of this specication.

rlhe first feature of my invention relates to a press having a stationary form-bed and a vibratory platen, which receives its motion from a driving-crank shaft, acting through side connecting-rods, attaching to the platen above the axis of vibration; and it consists in locating the axial shaft upon which the platen vibrates in rear of the platen, in a plane extending from its lower edge at right angles to its face, and supporting said shaft in slots in the side frames at right angles to thetype-bed; and, further, in providing the platen or platen-arms with bearing-surfaces at right angles to its face, in connection with similar bearing-surfaces upon the side frames, at right angles to the type-bed, from which construction and arrangement of parts an improved movement of the platen will result-viz: first, the platen will be caused to move at right angles to the type-bed in giving the impression, by reason of the bearing-surfaces on the platen coming in contact with those upon the side frames, and preventing further vibratory motion,thus giving a fair and true impression; second, the platen will be held most firmly in giving the impression, by reason ofthe relative positions which the axis of vibration, bearing-surfaces, and cranks will then occupy, thus preventing any slur in the impression 5 third, the vibratory motion of the platen will take place .immediately upon leaving the impression, by

reason of the relative position of the axis of vibration to the platen-face, thus giving such ample time for the vibration ot' the platen as to allow the printed sheet to be removed therefrom and a new sheet laid thereon with ease and facility.

The second feature of my invention relates to the construction of an ink-distributing tablc, to be arranged above the type-bed, with its face in the same plane with the face of the type, the hiking-rollers being made to traverse both form and table in succession and back at each impression, and itconsists in making said table in two parts, the upper part being stationary, and the lower part made to vibrate on an axis at right angles to its face, the vibration in one direction taking place while the ink-rollers are traversing the form, and the return vibration while they traverse the stationary part of the table, from which construction a movement of the distributingplate is obtained after each passage of the A inking-rollers, being a double movement to cach impression, resulting in a more perfect distribution of the ink.

'Ihe third feature of my invention relates to the nippers by which the sheet is clamped upon the platen while beingcarried to and from the impression; and it consists in forming several nipper-points on one edge of the nipper-inger, by notching the same, so that, by the use of short guides applied to the tympan in such position that said Dipper-points will strike between them, the sh eet may be fed up to said guides and clamped, however small the margin between the printed matter and the edge of the sheet.

The fourth feature 'of my invention relates to mechanism for stopping the motion of the press promptly and easily when required; and it consistsin arranging and connectinga brakelever to act upon the fly-wheel with a beltshifter, by which the driving-belt is thrown from a tight to a loose pulley in such a manner that the action of the belt-shifter will` be followed by that of the brake-lever, and both will be produced by one and the same act of the pressman. v

In the accompanying drawings, Figure I is a side elevation of a press embodying my said improvements. Fig. II is a sectional elevation. Fig. III is a front elevation, and Fig. IV is a sectional plan of same.

Like letters refer to like parts in each of the figures.

A A represent the side frames, supporting the type-bed shafts and operating parts of the press in the relative positions and arrangement hereinafter described, they having a proper contour for such purpose. B represents the' type-bed, which is located between the side frames in a vertical position, and is secured thereto by being bolted to appropriate lugs on the side frames. The form of type 'is locked in a chase, B1, in a common manner, and secured to the type-bed by hook-lugs at its lower edge and screw-clamp at its upper edge, in a common manner.

G represents the platen, and C1 the axial shaft upon which it vibrates, it being connected to said shaft by the platen-arms D. Its connection with the platen-arms is effected by theimpression-screws d1, one near each corner. By these screws the platen is adjusted to give a proper impression, in a common and well-` boxes G2 are at the end of the slot removed from the type-bed is such that when the platen is vibrated toward the type-bed until its face is parallel thereto a small interval-say, a

quarter of an inchonly will remain between its face and the face of the type.

E represents the crank-shaft, located in rear of the type-bed and opposite the center thereof, and supported in suitable journal-bearings in the side frames. The ends of this shaft overhang the side frames, and carry crankwheels E1 and E2, the motion of which is communicated to the platen, causing the same to vibrate back and forth, or to and from the type-bed, at each revolutiorrthereof by the attachment of the side connecting-rods F to the endsl of a shaft, G, passing through the platenarms D and through the 'segmental slots H in the side frames. These slots have the axial shaft as a center, and are of such length as to allow the required vibration of the platen to take place. The lower sides of these slots, at the ends nearest the type-bed, terminate in bearing-surfaces H1, at right angles to the type-bed.

The platen-arms D have bosses D2 projecting through the slots H in the side frames, the lower side of these bosses having ilat bearingsurfaces d3, at right angles to the face of the platen. The relative position of these bearings d3 and theframe-bearings lill to the axial shaft C1 is such that, as the platen vibrates toward the type-bed, they will come in contact with each other when the platen shall have assumed its parallel position before described. Any farther vforward motion of the platen will consequently require that it should move in the direction of these bearing-surfaces, which will necessarily be at right angles to the forni-bed, this being the direction of the frame-bearings H1. During this direct movement of the platen the axial shaft G1 will move in the slots C3, which are parallel to said frame-bearings H'. The impression being given at the end of this movement ofthe platen, such impression must be necessarily fair and true. After the impression is given the return movement of the platen begins, the first part of such movement being, of course, at right angles to the form, succeeded by a vibration upon the axial shaft.

Goiled springs I are applied between the boxes G2 and the ends of the slots, which, being compressed in the forward movement, will, by their reaction, return the boxes and axial shaft until the boxes strike the end of the slots C3 before the return vibratory motion will begin. By this means the necessary clearance -of the platen from the form will be obtained before the platen begins to vibrate.

The return vibration of the platen continues until its face becomes nearly horizontal, so that the pressman may easily remove the printed sheet and lay on a fresh one, to be printed at the next impression.

It will be observed that when the platen is in its forward position, parallel to the form, and the bearing-surfaces d3 of the platen-arms in contact with the frame-bearin gs H1, the line of draft of the cranks and their points of attachment to the platen will bear such relative position to the axial shaft Cl as to compel the platen to move steadily to and over the impression, and that this will be true whether the weight of the form be above or below said points of attachment; for, if below, the bearin g-surfaces d3 and H1 will become fulcra about which the platen will tend to turn, which tendency will be resisted by the bearing of the axial shaft in the frame-slots and the leverage which its particular location gives to it; and if above the points of attachment, themselves become such fulcra, and any tendency to turn thereon will likewise be resisted by said bearing of the axial shaft.

It may further be observed that no considerable time is lost in giving the impressionthat is to say, the platen begins its return vibration almost immediately upon leaving the form, so that it has very nearly one-half of the time allowed for one complete movement of the press to make such return movement, and a like time to make the next forward movement. The platen, therefore, moves with minimum speed, so that the pressman may feed the press with the greatest ease and facility, and the movements thereof be most steady and uniform.

I will now return to a description of thc shaft G, by which the connection of the side rods F with the platen is effected. The ends of this shaft are turned down to form wrists Gl for said rods F to take hold of, said wrists being eccentric to said shaft. A hand-lever, G2, is applied to one end of this shaft between the connecting-rod and platen-arm, and is secured against angular movement thereon by a key or feather in said shaft, with corresponding seat in said lever, the fit of said feather in said seat being easy, so that the lever may move longitudinally on said shaft.

The lever is forced against the platen-arm by a coiled spring, G3, interposed between the connecting-rod and lever, and has a V-shaped projection on its platen-arm side, which platenarm has a corresponding notch,into which said V-projection is forced by the action of saidI 'platen is on the impression the center of the shaft G, the centers of the eccentric-wrists, and the center of the crank-shaft will all lie in the same plane, thereby preventing any strain upon the locking device at the time of giving the impression.

An angular movement being imparted to the shaft G by the pressman moving the handlever G2, which will readily unlock by the yielding of the spring G, the position of the eccei'it-ric-wrists will change, bringing them nearer to the crank-shaft, and thereby virtually lengthening the connections F, and consequently shortening by so much the forward movement of the platen, thus preventing the same from giving an impression.

A second notch or stop on the platen-arm is provided to regulatethe amount of angular movement of the lever, ninety degrees being the proper amount to allow for such movement.

The hand-lever, beinglocated outside of the frame, may be readily grasped by the pressman, and operated as above described, whenever, from any cause, such as a failure to feed a sheet in time, or to allow more than one passage of the inking-rollers over the form, it may be desired to prevent the taking of an impression.

J J l represent the ink-distributing table, which is located above the type-bed, with its face in the saine plane with the face of the type. -The upper part, J, is stationary, being connected to the type-bed by the arms J2,

. bolted by bolts J 3 to lugs cast thereon, as represented. 'lhe part J1 is made capable of lateralvibration upon an axial pin, K, at right angles to its face, being operated as hereinafter described.

L represents the inking-rollers, supported in a sliding frame composed of the slide-blocks ZI and cross-rods l2. This sliding frame runs in grooves Z3 in the side frames parallel to the face of the type. The connection of the inkrollers with said slide-blocks is effected by the spring-carriers I4, so that-the rollers may have a proper pressure upon the type and distributing-table.

M represents a rock-shaft, supported in proper journal-bearings in the side frames in front of the type-bed, and carrying two long levers, M1, keyed thereon, and connecting with the slide-blocks Z1 by the links m2.

One end of rock-shaft M overhangs the side frame, and has a short lever, M3, keyed thereon, and the crank-wheel El has an eccentric, E3, on its inner side, from which a connection is formed with said short lever M3 by the eccentric-rod m4 and strap m5, so that the revolution of the crank-shaft will cause the eccentric E, acting through the medium of the rod m4, levers M8 and Ml, and links m2, to give a reciprocatin g motion to the inking-rollers over the type and ink-distributing table.

The position of the eccentric E, with reference to the cranks El and E2, is such that the inking-rollers will be at the upper extreme of their movements and on the inkin g-table when the platen is on the impression, and at the lower eXtreme when the platen has vbrated back from the type-bed.

The vibration of the movable plate Jl of the ink-table is effected as follows: N is a tappet-rod, working in dovetail guide in the bed-plate, and having at each end a lateral lug, nl, the contiguous slide-block of the inkroller frame having a lug, n2, projecting therefrom, so as to strike the lugs of the tappet-rod as said slide-block approaches the upper and lower extremes of its movement, and gi ve movement thereto. Said ta-ppet-rod has also a lug, a3, projecting toward the ink-table, and connecting therewith by a thumb-screw, n4, so that it will impart its movement thereto.

The distance between the lugs nl is less than the movement of the ink-roller frame by the amount of movement required to operate the ink-table-that is, the plate J l thereof. The movement-s of the said plate will, therefore, take place as the ink-rollers reach the extremes of their movement, vibrating in one direction when they are on the form, and in the other when they are on the stationary plate J, thereby causing the position of the plate J l and the ink placed thereon to change at each passage of the rollers over the same, thus crossing the grain of the ink at each passage of the rollers, and effecting a most thorough distribution thereof.

The bolts J 3, which secure the ink-table to the type-bed, act as hinges, upon which the same may be turned down into a horizontal position for convenience in cleaning.

I will now describe the nippers for clamping the sheets upon the platen.

O represents a slotted bar across the lower side of the platen, and hinged at the ends to brackets o1 secured to the platen, the axis ot' the hinge being in line with the lower edge of the platen-face.

P P1 represent the Dipper-fingers, which are secured at one end by bolts to the slotted bar O, the slottin g of the bar permitting their lateral adjustment to suit the size of sheet to be clamped.

P2 represents a lever projecting from one end of bar O, and provided at its free end with awrist-pin projecting into the slot of the cam Q, by which the nippers are operated, said cam being stationary and secured to the contiguous side frame.

Vhen the platen is in position to receive the sheet, the nipper-ngers P P require to stand at an angle of forty-five degrees, or more, to the platen-face, so that they may not interfere with the laying on of the sheet, and they further require to come down upon and clamp the sheet when the platen in its vibration toward the form shall have reached an angle of forty-uve degrees, or nearly so, to the formbed, and to continue to clamp the sheet until the platen shall return to said point after giving the impression, and then rise to the position before described, to permit the removal and laying on of asheet. The cam Q, to give this movement, requires to have a part, ql, struck from the axial shaft C1, as a center, which will maintain the clamping action during the required time, and a vertical part, g2, which raises the nippers at the right time, as described.

The left-hand nipper-nger P is notched upon its inside edge, so as to form nipperpoints P3, the functions of which will appear from the following: Thercommon manner of applying feed-guides to the platen is to irst take an impression upon the tympan, and then paste thereon thin narrow strips of wood, one parallel to the lower edge of the platen and one at right angles thereto, on. the left-hand side of the pressman as 11e stands in position to feed. This left-hand guide prevents the use of the left-hand nipper except when the desired margin on that side of the sheet is greater than the width of said nipper, and as one nipper is frequently found to beinsufficient to withdraw the sheet from the type, great inconvenience is experienced in consequenee.

The notched edge and nipper-points P3 overcome this difficulty fully, as with them it is simply necessary to make the left guide in one or more short pieces, and apply it or them to the tympan, so that said points P3 may strike between them and clamp the paper at such places, so that, whatever the margin to be left on the sheet, it may always be clamped upon Yboth edges, and its proper removal from the shaft, located below the crank-shaft E, and v supported in appropriate journal-bearings in the side frames. This shaft carries a pinion, S1, gearing with cogs on the periphery of the crank-wheel E2, and thereby imparting motion to the crank-shaft E, and thence to the various parts of the machine. Upon the left-hand end of this shaft is located a fast drivingpulley, T, and loose pulley T', and upon the opposite end a y-wheel, U. V represents a belt-shifter fork, attached to a rod, V1, passing through the side frame and across the press. V2 is a rock-shaft, at right angles to said rod, supported by lugs on the right side frame. V3 is a lever on said rock-shaft, taking hold of the contiguous end of rod V1. V4 is a footlever on the front end of said shaft, by which the pressman, by means of his foot, may operate the belt-shifter to throw the belt from fast to loose pulley, or vice versa, a downward movement of the foot-lever being the one employed to throw the belt from the fast onto the loose pulley. V5 represents a brake-lever on said rock-shaft, so set, with reference to the iiy-wheel and belt-shifting lever, as that it will come in contact with the periphery of the flywheel immediately after the belt shall have passed onto the loose pulley.

The action of the brake-lever, owing to the driving-power being first transferred to they loose pulley, will be to stop the motion of the parts almost instantaneously. The convenience and utility of this feature are manifest.

W W represent the feed-tables, arranged with reference to platen, in a common Aand well-known manner.

Having thus described my improvements, what I claim, and desire to secure by Letters Patent, is-

l. The combination and described relative arrangement, with the platen, of the axial shaft G1, bearing-surfaces d3 and H1, drivingcranks E El, and connecting-rods F, substantially as herein set forth.

2. The ink-distributing table, composed of the stationary part J and vibrating part J1, arranged to operate substantially as set forth.

3. A Dipper-finger, P, having nipper-points P3, formed by notching its edge, when coinbined with a platen, and operating substantially as described.

4.. The described arrangement of the rockshaft V2, foot-lever V, shifting-lever V3, rod V', and fork V with the brake-lever V5, fast and loose pulleys T T, and fly-wheel U, to operate as set forth.

W. H. FORBUSH.

NVitnesses ALEXR. A. C. KLAUCKE, SAMUEL SMITH.

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