US90521A - Benjamin geobge george - Google Patents

Description

NAPETERS, PHOTOLTHOGRAPHER, WASHINGTON. D C.

BENJAMIN GEORGE GEORGE, OF LONDON, ENGLAND.

IMPROVED MACHINERY FOR BRONZING PRINTED WORK- Speciiieation forming part of Letters Patent No. 904,521, dated May 25, ISGS).

.To all 'whom 'it may concern:

Be it known that I, BENJAMIN GEORGE GEORGE, of 47 Hatton Garden, London, England, printer1 have invented Improved Machinery for Bronzing Printed Work; and I do hereby declare that the following, taken iu connection with the drawings which accompany and forni part of this specification, is a description of myinvention sufficient to enable those skilled in the art to practice it.

This invention relates to a novel arrangement of machinery for applying bronze-powder and powdered color to surfaces prepared by being printed with an adhesive material to receive the bronze or v color, the objects being to economize the use of the powder by stopping the delivery of the same when the printed Work is not in contact with the distributingroller, to save a large amount of labor, and to produce a good finish.

In the accompanying drawing, Figure 1 shows my improved machine in side elevation, and Fig. 2 is a vertical section taken through the center of the machine.

Ais one of a pair of cast-iron standards for providing bearings or supports for the spindles, shafts, stud, axles, and other parts of the machine.

B is a rotating drum for presenting the printed paper to the bronzing-roller and carrying it through the machine. This drum is keyed to a shaft, B', which receives an axial motion from a winch-handle or other suitable means.

The periphery of the drum is cut away at one part to allow of the application thereto oi' a griper, C, which is composed, by preference, of a segment-plate, carried by arms keyed to a rock-shaft, C1, having its bearings in the sides of the drum B. Keyed to this rockshaft (Within the drum) is a roller, c, to which an elastic band, c', is secured, its other end being made fast to the drum for the purpose of holding it at tension, and thus giving it a tendency to pull over the griper and cause it to take hold of the paper presented thereto.

n For releasing the gripe at the proper time, I provide a segment-cam, C2, which is fixed to the upper part of the standard A, Fig. 1, in the path of a cam or tappet, C3, keyed to the extremity of the rock-shaft Cl, that is protruded from the side of the drum B. As this cam or tappet G3 is brought, by the revolution of the drum, into contact with the fixed cam G2, the shaft G1 will be caused to rock and throw back the griper into the dotted position of Fig. 2, thereby releasing the paper that has been carried through the machine, and providing for the feeding in of a fresh sheet.

1When the tappet has passed thecam G2, the tension-spring c will come into action and close the gripers on the Work, and the rotation of the cylinder will serve to carry forward the work, Whether it be a sheet of p aper printed with adhesive composition or a length of paper-hanging, or other material similarly prepared for bronzin It should be here remarked that to suit the machine for this latter Work the griper must be thrown out of action at the proper time to free the griped end of the paper and allow of its being taken up by a deliverylroller provided to receive it. The Work, as it is advanced, is brought under the action of a rotat-4 ing bronze-distributor, D, which may consist of a Wooden roller covered with felt or velvet, or a roller composed of some suitable elastic substance; or a soft brush may be used for the purpose.

The bronze-distributor is mounted in sliding bearings carried by the standards, and below it is fitted a hollowed or segment-shaped block, d, Which is free to slide upon guides that carry it) With the roller D. This roller fits the block cl, in order that as the roller rotates it may act as a spreader to equalize the supply of bronze on the periphery of the roller.

The distributing-roller D is held in a backward position by means of a spring or a w eighted cord to keep it out of action. Above the roller D is mounted a box, D', which carries on its upper part a hopper, all, the bottom oi which is closed by a roller, d2, that revolves in contact with the distributing-roller D.

In the hopper the bronze or color powder is placed, and rotary motion being given to the roller d2, it will take up a certain portion of bronze and transmit it to the roller or brush D belowand the roller or brush will, in working over the bottom of the block el, as before mentioned, have the bronze spread evenly over its surface.

In order to regulate the supply ci' bronze according to the Work in hand, I provide for VV,with a spur-pinion, the pitch-line of which is shown at l, Fig. l. This pinion is designed to engage with a spur-wheel, 2, mounted on a stud-axle on the standard A, and carrying at its boss a pinion, 3, which gears into a spurwheel, 4, keyed on the main axle.

The roller D is caused to advance (so as to bring its pinion into gear) by a pair of cranklevers, E, or their equivalent, which levers are set in action by cams or wipers F, itted to thc sides of the drum.

The crank-levers E are iitted at their lowerv ends with a bowl to receive the pressure of the cams or wipers F, and their upper ends bear against the axle of the distributing-roller to press it toward the drum. One of these cranklevers has an extension, (shown by dots at Fig. 2,) which carries a tension-pulley, e, for the purpose to be presently explained. The cams or wipers F are composed of segment-pieces, in order that they may be lengthened or shortened (or made continuous) to suit the work in hand, the object being to enable them to keep the bronzing apparatus in a position for action only so long as work is presented to the action of the distributingroller. In printing sheets, therefore, (that being the general run of work,) so soon as the sheet has passed the bronze-distributor the cams F will allow the bronze-distributer to retire, the spring or counter-weight serving to draw the pinion l out of gear.

A strap, 5, from a pulley, 6, on the drivingshaft passes round a pulley keyed on the axle of the roller d2, for the purpose of giving motion thereto. This strap, however, only acts when brought to tension by the depression of the pulley e, which is occasioned by the action of the cam F on the crank-lever that carries the roller D. The tension, therefore, of the strap is retained only so long as the cams F are in contact with the bowls of the cranklevers E, and consequently the rotation of rollers d2 and D will cease together.

As the roller d2 rotates it will carry on its surface a supply of bronze orvother powder, whlch it will deliver to the distributing-roller below, and the roller D having been brought into contact with the work by the action of the cams F, it will impart to the printed surface a supply of bronze or other powder, which will, whenever it meets with the sticky substance imparted to the paper by the preparatory printing operation, adhere firmly thereto.

Beneath this roller just described is placed a precisely similar and duplicate roller, D",

mounted and driven in exactly the same manner as the roller D. The object of this second roller is to take off superfluous bronze and to polish the work. The bronze which would accumulate upon this roller is scraped off by the bar q, and falls into the receptacle r. The bar slides in the slots z of the side guides, s,act- -in g by its own weight, or, if necessary, by the assistance of springs. This second roller, D X, is driven by the same spur-wheel, 2, which drives the first roller, D.

As the work leaves the bronzing apparatus, i

it is carried round by the griper or clips to a rotary brush or brushes, G, which remove the superfluous or loose bronze-powder from the face of the work, and a bar, G', placed across this brush, serves to flick the powder from the bristles and discharge it into a receptacle below. After the work has passed under the action of this brush it is submitted to a polishing-roller, P, turning in the opposite direction of the drum B, which will finish the work,

by adding brillianoy to the bronzed impression.

The work (if sheets are being bronzed in contradistinction to pieces) is then discharged onto' an endless apron, the griper or clips being opened to release the work.

,The cleaning-brush, the rotary motion of which is derived from the central shaft,v (through a train of wheels, 7, 8, and 9, gear- "ing into the spur-wheel 4,) is brought into action in the same manner as described with ref-l erence to the bronze-distributer, in order that it may act only when in contact with the work, and thus be kept from imparting bronze to the periphery of the drum when that is not covered with paper. The brush is mounted in bearings which are free to slide verticallyl in guides, and connected therewith is a cranklever, H, which is pivoted to the standard A. The upper end of this lever carries a bowl, which is so placed as to stand within the circuit of the cam F when the brush is out of gear and at its lowest position. When, therefore, the cam F is brought by the rotation of the drum into contact with the bowl of the crank-lever H, that lever will lift the brush into gear, and retain it in acting position; but so soon as the cam has passed the bowl the brush will fall (by its own weight) out of action. The same action is imparted to the polisher P, and for the same reason.

To keep a good surface, or to prevent the bronze from clogging on the distributers D D x, brushes having reciprocating endwise motion are provided, which, being caused to move across the surface of the distributers by the daction of a tappet-wheelkiupon a rock-lever to which the brushes are connected, will prevent the bronze accumulating in rings or ridges on the rollers; or the like result may be obtained by giving the rollers D D X a slight endwise motion, as is common to doctor-rollers of printing-machines. y

To avoid, as far as possible, all waste in the 1V/se of the bronze or other powder, I box in the above-described parts, as shown in the drawing, and I also provide a tray, I, below ,the hopperbox, to catch any powder that may fall in the act of transferring it from the distributing-roller to the paper.

An obvious modification of my invention for stopping the delivery of the bronze-powder when the printed Work is not in contact with the distributing-roller is to make the distrihutingmoller and the clearing-brush stationary, and to form a raised bed on the periphery of the drum to receive the printed Work, and thus to enlarge the diameter of the drum suciently to bring the Work into contact with the distributing-roller. This bed may, like the cams F, for which it will be a substitute, be formed of segment-pieces-say of india-rubber or other suitable substancewhich may be added to or diminished in number to suit the size of sheet intended to be operated upon by the distributing-roller.

Having now set forth the nature of my :in-

Witnesses:

G. F. WARREN,

Trios. BROWN, Both ofNo. 17 Grafisch/Wah Street, llo/mienl

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