US390139A - Printing-press - Google Patents

Description

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G. W. PROUTY.

PRINTING PRESS. No. 390,139. Patented Sept. 25,1888..

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GEORGE lV. IROUTY, OF BOSTON, MASSACHUSETTS.

PRINTING-PRESS.

SPECIFICATION forming part of Letters Patent No. 390,139, dated September 25, 1888.

Appication filed November 7, 1887. Serial No. QSL'lf). (No model.) d

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Be it known that I, GEORGE W. PRoU'rY, of Boston, in the county of Suffolk and State of Massachusetts, have invented a new and useful Improvement in PrintingPresses, of which the following, taken in connection with the accompanying drawings, is a specification.

My invention relates to printing-presses, and to that class of such presses usually termed jobpresses,77 and that have fixed beds and vibrating platens; and it consists in certain novel features of construction, arrangement, and combination of parts for imparting to the platen a vibratory motion to and from the bed or type-form, with a dwell or standstill when farthest removed from said bed or form, all of which will be readily understood by reference to the description of the drawings, and to the claims to be hereinafter given, and in which my invention is clearly pointed out.

Figure l of the drawings is a side elevation of a printing-press embodying my invention, with the several parts in position for feeding the paper to the platen. Fig. 2 is a sectional elevation of so much of the same as is neces` sary to illustrate my improvement, the cutting plane being on line ww on Fig. l, and the several parts being in position for giving the impression; and Fig. 3 is a vertical section on line y i/ on Fig. 2.

n the drawings, A is the main frame of the machine, having cast therewith or secured thereto at A the bed. Not shown.)

Bis the platen, pivoted at a to said frame.

G is the feed-table; D, the inkdistributing table; b b b b, the inking-rollers5 E, the main driving-shaft; F, the crank-shaft; G, theinking-roller-carryin g frame, operated by the link G and the crank-pins o, set in the gear-wheels H, as shown; and I is one of the draw-rods for operating the platen through the oscillations of the rocker-shaft J and the elbow-lever J', carried thereby, to the arm d of which said rod I is pivoted, as shown. To the arm d of the elbow-lever J is pivoted one end of the link K, the opposite end of which is pivoted to the lever L, mounted upon the rocker-shaft L', and carrying near its free or movable end, but to one side of the rod e, connecting said lever to the link K, the rod e', which passes through the slot f, formed in the upper end lof the pitman M, the lower' end of which has a bearing upon the crank-pin g of the crankshaft F, all as shown in Figs. 2'and 3.

The lower end of the link K has firmly secured upon each side thereof a cam, h, a portion of the periphery of which, as at t', is concentric to the axis of the pivotal connection of said link to the lever L, and against which the periphery of the ring-like truck j, mounted upon a hub, one at each side of the pitman M, and surrounding the slot f, impinges when the parts are in positions shown in Fig. 3, and along which said trucks roll while the platen is moving away from the bed, and effectually locks the pivot or rod c in the outer end of the slotfa sufficient time to insure the downward movement of the platen until the axes of the lever L and the pivotal connections of the link K with the levers L and J are in line, as shown in Fig. l, which occurs before the crank-pin g has reached the upper deadpoint in its revolution relative to the pitman M. At this point the trucks j pass from the concentric surfaces of the cams 7L to the concave surfaces t" of said cams, and the pitman M will continue to move upward until the crank-pin g has reached the dead-point in its revolution and the lower end ofthe slotf has come into contact, or nearly so, with the rod e, as shown in dotted lines in Fig. l, without affecting the position of the platen, the peripheries of the trucks j moving freely past the cutaway or concave sides of the cams h, thereby permitting a movement of the pitman without moving the platen. As the crank-pin g continues its revolution beyond its upper dead-point, the pitman is moved downward until the upper end of the slotf comes in contact with the rod c' without moving the platen, so that the platen remains in a state of rest during the upward and downward movements of the pitman M for a distance equal to the lost motion in the slot f, which slot may be made of greater or less length, according to the length of time that it is desired to have the platen remain at rest for the purpose of feeding the paper. Y

Itwill be observed that at the time the upper end of the slot fcomcs in contact with the rod e to move the platen toward the bed the pivotal connection of the link K with the IOO lever L has to 1nove through quite a long distance to move the platen a very small dis tance, and henee said platen is moved from ils state of rest without shook or jar.

What I elaiin as new, and desire to seenre by Letters latent ol the United States, is-4 l. In combination with the crankshaft, platen, and draw-bars of a printingpress, a pivoted lever provided with two pivots or hearing-rods at or near its free or movable end, a pitrnan eonneeting one of said pivots or hearing-rods with the erankpin olvl said erankshaft and slotted to permit an endwise movement of said pitnian upon said bearing-rod, an elbow-lever connected by one arm tothe platen drawsbnrs, a link connecting` the other arm of said elbow-lever to the other pivot or heari ng-rod o1' the pivoted lever, anda locking device consisting` oi' a earnshaped disk rigidly secured to the lower end o' said link, and constructed and arranged to hear upon the upper end of said pitnlan during a portion of the revolution of the crank-shaft, and thereby maintain the pivotal Connection to the slotted end ol' the pitinan at the outer end ofthe slot and during another portion of the revolution of the Crank-shaft to assume a position to allow said pitnlan to continue its movement without acting upon said earn to give the required dwell to the platen.

2. In combination with the crank shaft, platen, and draw-bars ol' a printing-press, the pitnian M, provided with the slot f, the pivoted lever L, provided with the pivot or bearing-rods c and e. the elbow-lever J', the link K, the ealns 7L, fixed on said link K, and the trneks j j, all constructed, arranged, and adapted to operate substantially as and for the purposes described.

ln testimony whereof l have signed my name to this speeifeation, in the presence of two subscribing witnesses4` on this 5th dayof November, A.. D. 21.887.

GEORGE W. IROUTY.

Vitnesses:

N. C. LOMBARD, XVALTER E. LOMBARD.

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