US471368A - Printing-press - Google Patents

Description

(Ne Model.) 2 Sheets-Sheet 1 W. B. YATES.

I PRINTING PRESS.

No. 471,368. Patented Mar. 22, 11892.

(No Model.) '2 Sheets-Sheet :2. W. B. YATES.

PRINTING PRESS.

No. 471,368. Patented Mar. 22, 1892.

- UNrrho rates ATENT 'FFicE.

WYILLIAM B. YATES, OF CHICAGO, ILLINOIS.

PRINTING-PRESS.

SPEGIFICATION forming part of Letters Patent No. 471,368, dated March 22, 1892.

Application filed October 7, 1891. Serial No. 407,990- (No model.)

T0 at whom it may concern:

Be it known that I, WILLIAM B. YATES, a citizen of the United States of America, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Printing Presses, of which the following is a specification.

This invention has for its purpose to give to the bed of a printing-press a reciprocating movement that shall partake of the movement derived from a cranknamely, accelerating and retarding-except at that portion of the stroke where the bed engages the cylinder for the purpose of printing. At this portion it shall run in perfect harmony with the cylinder, which revolves at a uniform velocity.

The preferred form in which I have embodied my invention is shown in the drawings by means of four figures, in which- Figure 1 is a broken side elevation of the portions of a printing-press to which my devices are attached; Fig. 2, a similar end elevation of the same, and Figs. 3 and 4 views similar toFigs. 1 and 2 of my invention applied to a press having a bed geared up by means already well known to double the motion.

Describing the device shown in Figs. 1 and 2 from the drawings by means of referenceletters applied to the different parts, A represents a portion of the frame of the press, 13 a rotating cylinder above the bed of the press and adapted to carry the paper to be printed, and C a type-bed traveling back and forth in suitable guides and upon the ordinary antifriction devices, said bed containing the form t be printed.

Upon the under surface of the bed is a rack 0, having broad teeth, and a broken gear D and a toothed sector E are provided with teeth adapted to mesh with said rack, the former being mounted upon a shaft d and the latter pivoted to the frame by means of a pin e. The shaft d also carries a gearwheel D in mesh with a gear B upon the shaft 1) of the cylinder B. The broken gear D has teeth about only a portion of its periphery, so as to engage with the rack 0 only when this portion is brought by the rotation of the gear into engagement with said rack. The sector E subtends an arc of the same length as the rack c and is always in engagement thereupper end of the slot is so curved that when the teeth upon the gear D strike the rack c the sector E may accommodate its motion to that of the gear D, which during this portion of the movement drives the rack 0; but as soon as the teeth disengage from the rack the Wrist-pin takes up the further driving of the bed, giving to the sector E a combined crank v and cam motion, which renders it possible to vary the speed as desired, and as the pin continues its revolution below the shaft d, its ongagement being much nearer to the pivot e, the return movement of the sector is much quicker than the advance. Theoretically the teeth upon the gear D might be dispensed with, because a perfect adjustment of the slot e would gain the desired motion without the aid of the teeth upon the broken gear as long as the roller upon the pin cl remained a perfect fit in the slot; but in practice the wearing of the slot renders it uncertain, and as it is of extreme importance that the motion of the bed during the printing should be exact and accurate the broken gear D is practically an essential portion of the device. I do not, however, desire to limit myself to the use of said. gear, as the absence of the teeth thereon would merely detract from the value Without destroying the operation ofv the invention. I prefer, also, a toothed engagementbetween the sector E and the bed C. It is obvious, however, that the sector might be made inthe shape of an oscillating arm (shown in dotted lines at E) and said arm connected to the bed by means of a link, (shown in dotted lines at 6 Hence I do not desire to confine my invention to any particular means of engagement between these two parts.

In the modification shown in Figs. 3 and 4 the device is exactly like the one described, with the exception that the rack marked 0, which engages with the broken gear and the vibrating sector, is fast upon a carriage O, in which is journaled a gear 0 meshing with a rack a upon the frame of the press and also with the rack 0 upon the bed C. This is a commonmethod of doubling the motion ofthe bed 0, and makes no difference in the operation of my invention.

I claim as new and desire to secure by Letters Patent-- 1. The combination, in a printing-press, of a rotating impression-eylinder driven at a uniform speed, a type-bed adapted to reciprocate beneath the cylinder, a vibrating plate pivoted to the frame and suitably connected with the type-bed, a shaft jonrnaled in the frame eccentric to the platepivot, a rack under the type-bed and a broken gear upon said shaft adapted to engage with said rack during the printing operation, a slot in the vibrating arm, and a crank-pin suitably mounted upon the shaft and adapted to engage in the slot, the latter being so shaped as to allow the vibrating arm to accommodate itself to the motion of the carriage while the same is driven by the toothed gear, substantially as described.

2. The combination, in a printing-press, of a rotating impression cylinder driven continuously at a uniform speed, a bed adapted to reciprocate beneath the cylinder, a shaft journaled in the frame and geared positively to the cylinder, a vibrating plate pivoted eccentric to the shaft, connected with the bed and containing a slot, and'a crank-pin suitably secured to the shaft and adapted to engage with the slot, said slot being so curved as to give to the bed a uniform motion during the time the impression is made at the same speed as that of the cylinder, substantially as described.

8. The combination, in a printing-press having an impression-cylinder B, driven continuously at a uniform speed, of a shaft (1, journaled in the frame of the press, carrying a broken gear D and positively geared to the cylinder, a reciprocating bedhaving a rack 0, adapted to engage with the teeth of the broken gear, a sector E, pivoted eccentric to the shaft (l, adapted to engage with a rack upon the bed and containing a slot 0, and a wrist-pin (1 upon the broken gear adapted to engage in said slot, the slot being so curved as to al' low the sector to accommodate itself to the motion of the rack upon the bed when the broken gear engages with therack 0, sub stantially as described.

WM 13. YATES. Witnesses:

O. P. SMITH, CHARLES O. Snunvnv.

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