US247463A - johnston - Google Patents

Description

' (No Model.) t 5 Sheets-Sheet 1. R. J. JOHNSTON. v

PRINTING MACHINE.

Patented Sept. 20, 1881.

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(No ModeL) R. J. JOHNSTON.

. PRINTINGMAOHINE;

Patented Sept. 20, 1881.

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(No Model.) 5 Sheets-Sheet 3.

R J. JOHNSTON. PRINTING MACHINE. No. 247,463. Patented Sept. 20,1881.

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N 0 T S N H O J l R PRINTING MAGHINE.

No. 247,463. Patented Sept; 20, 1881.

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v (No Model.) 5 Sheets-Sheet 5.

R. J. JOHNSTON.

PRINTING MACHINE.

No. 247,463. Patented Sept. 20,1881.

INVENTOR: WITNESSES: km} m 7 By his Attorneys,

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UNITED STATES PATENT OFFICE.

ROBERT J. JOHNsTON, OF BROOKLYN, ASSIGNOB OF ONE-HALF TO JOHN WILKINSON, OF NEW YORK, N. Y.

PRINTING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 247,463, dated September 20, 1881.

6 Application filed March 17, 1881. (No model.)

To all whom it may concern Be it known that I, ROBERT J. JOHNSTON, a citizen of the United States, residing in Brooklyn, in the county of Kings and State of New York, have invented certain Improvements in Printing-Machines, of which the following is a specification.

My invention relates to that class of machines employing a reciprocating bed and a revolving platen or impression-surface.

In the accompanying drawings, Figure l is a front elevation, partly in vertical section, out in the plane of the line 1 1, in Figs. 2, 3, and 4, and showing the bed at the top of its stroke. Fig. 2 is a vertical section taken along the lines 2 2 in Figs. 1 and 4, and looking in the direction of arrow 2. Fig. 3 is a similar section taken along the lines 3 3 in Figs. 1 and 4,looking in the direction of arrow 3, and showing-the bed at the bottom of its stroke. Fig. 4 is a horizontal section taken in the plane of the line 4 4, in Figs. 1, 2, and 3, with the bed at mid-upstroke. Fig.5 is a detail view, and Fig. 6 is a diagram.

LetA designate the frame of the press, which may be of any suitable construction adapted to support and furnish bearings for the moving parts, and to resist the strain of the impression.

B is the bed, which slides in vertical grooves or keepers a a, Fig. 4, in the frame A, and is provided on its back side with a vertical cograck, 12, which meshes with a segment, 0, mounted on a shaft, D, which shaft oscillates in adjustable journal-boxes d d. The segment 0 has a radial slot, 0, in which works aslidin g block, crank-wrist, or other projection, e, which is mounted on a crank-wheel, E, or other form of crank fixed on a shaft, F. This shaft rotates in adjustable journal-boxesfj', and has fixed to it a gear-wheel, Gr, which meshes with another gearor pinion, g, on a power-shaft, H, bearing belt-pulleys h h, and a fly-wheel, H.

The several rotating parts move in the direction of the arrows marked thereon in the drawings. The block 0, while moving from its lower to itsupper position, approaches quite close to the shaft D, and consequently gives the segment (3 a rapid upward movement, while in descending its movement is remote from said shaft, so that it gives the segment a slowdownward movement. As the segment drives the bed, the latter is thus caused to ascend rapidly and to descend slowly.

The speed of the bed at different parts of its stroke is shown in Fig. 6, where the line B follows such a curve as would be traced by a pencil fixed tothe bed and marking a paper drawn horizontally past it at a uniform speed.

In front of the bed is arranged the platencylinder I, mounted on a shaft, J, which rotates in adjustable bearing-boxesjj, and has fixed to it a gear, K, which meshes with the gear G. Both gears G and K are of the same diameter. The impression-surface or platen 11 includes from one-third to one-half the circumference of the platen-cylinder, and is of greater radius than the remaining portion of the latter. The speed of rotation of the platen is uniform, as shown bythe line H in Fig. 6, which is straight and inclined at an unvarying angle. Thisline is such as would be drawn by a pencil moving vertically downward at the same speed as the impression-surface i, and marking the horizontally-moving paper before mentioned. The bed B is provided with the usual provisions, k k, for attaching the chase lcontaining the form of type L. The form is attached to the lower portion of the bed, while to the upper portion is fixed a distributing-plate, M. As the bed descends the platen or impressionsurface'i comes opposite the form and presses the paper against the type. As the bed moves slowly at this time, the requisite dwell is secured, thereby producin gagoodimpression. To recover the time lost by this retardation,I cause the bed to ascend much more rapidly, as already described. The sheet is fed onto a table or feed-board, P, which is arranged just above the platen-cylinder, and its overhanging edge is caught by gripers a n, of the usual kind and operated in the usual manner. Fig. 2 shows the machine in the feeding position, and Fig. 8 in the delivering position. The sheet passes around with the platen, is pressed into contact with the type, and is carried beneath the platen, when itis released by the gripers and carried away by delivering-tapes, (not shown,)

all in the usual manner. During the impression the bed and platen are both driven at the same speed by the segment and gears G and K, as clearly shown in Fig. 6, where the lines a and B are both at the same angle for a portion of their travel but to avoid any slurring of the impression, resulting from lost motion in the gearing, I provide a rack, 19, fixed to the bed and meshing with a toothed segment, q, fixed to the side of the platen-cylinder, as shown in Figs. 1, 2, and 3. I prefer to use two racks and segments, one at each side, as shown, but one may suffice. In case of any binding or locking of the gears while the segment 11 and rack 11 are in mesh, the teeth of the gears G and K, which are then in mesh, or those teeth of one of said gears (preferably the gear K) should be slightly eased or reduced by filing, in order that the machine may run smoothly; or those teeth of the gear K may be entirely cut away, making that gear but a segment or partial gear, in which case the platencylinder will be driven a part of its revolution from the gear G and the remainder of its revolution from the rack 12.

The inking apparatus I prefer to use with my press is shown in Figs. 1, 2, 3, and 5.

Q is the ink-fountain; 1', the doctor-roll; s, the adjustable blade; 2?, the feed-roll; R R, the inclined distributing-rollers, and S S the inking-rollers. The rollers It R and S S are arranged one above another in inclined slots in brackets u u. The roll 1- is mounted on radial arms t t on ashaft, c, which has another arm, '0, on its end. This arm is engaged by a rod, 10, which extends down into contact with a cam, 10, on the shaft J, (or it might be on the shaft F My press has the ad vantage that allthe more important working parts-that is, all the printingparts--are readily accessible to the operator, and all arein plain sight during the operation of the press. At each stroke of the bed the entire form and distributin g-plate pass before the eye of the operator, so that he may instantly detect any defect in the inking or any possible dropping of type from the form. The form is inserted and removed through the space between the two sets of rollers R and S. The weight of the bed, form, and segment is counterbalanced in whole or in part by a weight or weights, T, fixed to the shaft D, as shown, 01: forming a continuation of the segment.

On top of the frame A, I place a table or imposing-plate, U, on which the form may be placed in case any correction is necessary. This will be found a great convenience, as it saves carrying the form from the press-room to the composing-room and back again. Underneath the table U is a space which I propose to utilize by placing there a roller-box, ink-supply, &c.

If desired or preferred, my press may be laid with theback of the frame on the floor, so that the bed shall move horizontally, the only changes necessary being in the arrangements of the table P and ink-fountain Q and the bearings of the rollers It S.

I claim as my inventionl. In a printing-press, the combination of reciprocating bed B, rack 1), segment 0, slot a, crank E, wrist-pin c, shaft F, gears Gr and K, shaft J, and rotating platen i, substantially as set forth.

2. In a printing-press, the combination of reciprocating bed B, rack 1), segment 0, slot 0, crank E, wrist-pin c, shaft F, gears G and K, shaft J, platen-cylinder I, segment q thereon, and rack 12 on the bed B, meshing therewith, substantially as set forth.

In witness whereof I have hereunto signed my name in the presence of two subscribing witnesses.

ROBT. J. JOHNSTON.

Witnesses:

ARTHUR O. FRASER, HENRY GONNETT.

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