US258770A - Joseph keayee - Google Patents

Description

(No Model.)

J. KRAYER.

LITHOGRAPHIG PRINTING PRESS.

Patented May 30, 1882.

N. PETERS. Pmm-Lnhagnpher. washmgmn D, C.

UNTTED STATES PATENT @Tricia JOSEPH KRAYER, OF JOHANNISBERG-ON-THE RHINE, GERMANY.

LITHOGRAPHIC PRINTING-PRESS.

o SPECIFICATION forming part of Letters Patent No. 258,770, dated May 30, 1882,

Application tiled March 2, 1882. (No model.) Patented in Germany August 16, 1979, No. 6,666.

To all whom it may concern:

Be it known that I, JOSEPH KRAYER, of J0 hannisberg-on-the-Rhine, Empire of Germany, havcinvented certain new and useful Improvements in Lithographie Presses; and I hereby declare the same to be fully, clearly, and eX- actly described as follows, reference being had to the accompanying drawings, in which- Figure l is a longitudinal sectional view of the device on the line X X of Fig. 2. Fig. 2 is a front elevation; Figs, a sectional view, showing the device for raising or lowering the stone; Fig. 4, a similar view ofa modied form of the same device. Fig. 5 is a horizontal sectional view, and Fig. 6 an enlarged view of a detail of the device.

My invention relates to devices for adjusting lithographie stones in their holders, whereby the surface may be brought to a truly-horizontal position and to theproper height for printing, and also-to mechanism having for its object to facilitate theplacing of the stone in and its removal from the holder. My said invention consists in certain devices for accomplishingthe ends named, constructed and operating substantially as hereinafter set forth.

Referring now to the iirst part of my invention, I would state that great difficulty has heretofore been met with in adjusting lithographic stones in the holders by reason of the unevenness of the lower side ofthe stones, or due to inequality in grinding away the surface; and my invention is designed to remedy this evil by providing the holder with a number of supporting-wedges for the stone, the said wedges being independently adjustable, so as to bring the face of the stone truly horizontal, and being also so connected as to raise or lower the stone vertically.

In the drawings, ct is the plate, on which rests a second plate, 7c, on which latter the stone is laid, and Z1 b are wedges, four in number, one of them being located in each corner of the holder. Each pair of wedges is connected by a rod, c, which passes through the holder and is threaded at the end d. Ratchet-wheels c e are screwed on the ends d, and have collars that engage with suitable grooves on the bearings, so that on turning the wheels the wed ges are drawn in or out, as the casemay be. Levers ff are mounted on the sleeves of the ratchetwheels, andeach carries a pawl, s, adapted to engage with the teeth of the wheels. These pawls are reversible, so that on throwing them into engagement with the teeth to the right or left the wheels may be made to turn vin either direction, as may be desired. The two levers are connected by a rod, g, as shown in Fig. 2. The wedges b bear against inclined lugs on the under side of the plate a, while the wedges b bear against wedges 7L, mounted upon screwrods t', that pass through the side flanges of the plate a. The latter' is provided with lugs, which slide vertically in groovesa1 in the sides ofthe holder.

In operation the stone is laid on theplate r, and is adjusted to a horizontal position by means of the wedges b bh. The horizontality of the stone with reference to an axis at right angles to the rods c is attained by working either pair of wedges b b', as may be desired, the other pair being thrown out of gear, as it were, by turning its pawl s to a vertical position. As soon as a spirit-level laid at right angles to the rods c shows that the stone is horizontal with reference thereto it is turned parallel to the rods c, and the wedges 'It are run in or out, as may be necessary, by turning the screw-rods i'. The surface ofthe stone being thus adjusted horizontally, it is raised or lowered bodily to brin gits surface to the proper height for printing. This is-done by throwing the two pawls s into engagement with the wheels e on the same side (either to the right or left of the shafts) and workin g either lever f. All four wedges, b b b' b', are thereby simultaneously drawn out or in, as the case may be, raisingorlowering the stone verticallyi` The second part of my invention relates to a device for facilitating the placing of the stone on or its removal from the plate which supports it. These operations, especially in the caseof heavy stones or such as nearly lit within the holder, are attended with considerable difficulty, and the stone is frequently chipped or broken.

I have devised an attachment for the holder whereby the supplemental platec may be raised flush with the top of the holder, so that the stone may be slid onto it or off it, as desired.

Through one side of the holder passes a shaft', fm, having a lever, l, and on the shaft is keyed at either end an arm, a. The latter are connected by hars o q with bell-crank levers p, pivoted in the sides of the holder. In the ends of the levers p are studs or points, o', which enter between teeth on the under side of the plate 7i'. This mechanism is duplicated on the opposite side ot' the plate. 0n turning the lever l in the direction ot the arrow the studs rise, lifting the plate r. On reversing the motion ofthe lever the plate is lowered.

In Fig. 4 is shown a modified form ot' the same device. The lever lis pivoted at i', and bars o o are pivoted to the lever at either side of its fulcruin, and are attached at the opposite ends to arms a, thatare keyed on the shafts m at either side of the holder. Arms p, projecting from the shafts in through slots in the Walls of the holder, serve to lift the plate 7c as the lever l is rocked.

Having thus described my invention, what I claim as new, and desire to secure b v Letters Patent, is

1. In a lithographie press, the supportingplate for the stone, resting upon a series of wedges, as set forth, in combination with mechanism, substantially as described, for moving the same either singly, in pairs, or all at once, whereby the stone tntv be adjusted to a horizontal position, and then raised or lowered vertically, as may be. desired.

2. In combination with the stone-holder, the wedges b b', connected together at either side of the saine, the supplemental wedges h, and mechanism, substantially as described, for operating the wedgesin pairs or singly, substantially as set forth.

3. In combination ith the holder and plate a., the wedges b b h, ratchet-wheels e, screwrods rl, and connected levers f, having pawls s, as set forth.

Lt. In combination with the holder, the sup portingplate k for thc stone, and mechanism, substantially as described, for raising the same tiush ivith the upper edge of the holder, and for lowering it, as set forth.

5. In combination with the holder, the supporting-plate k, shaft m, lever l, rods 0 q, and bellerank levers p, substantially asdescribed.

(i. In combination with the stone-holder ota lithographie press, the plate a., having independentlv-movable wedges atthe corners thereof for adj nsting the plate horizontally, the su p` plemental supporting-plate k, and mechanism, substantially asdescribed, forlifting the latter ilush with the edge of thc holder, and for lowering it npoii the plate a, as set forth.

JOSEPH KRAYER.

Witnesses:

LoUIs BASSE, II. Dmznn.

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