US80444A - William braidwood - Google Patents

Description

WILLIAM BRAIDWOOD, o 'r NEW roeien.` Y.

Letters Patent ly' 80,444, dated July 28, 1868.

IMPROVEMENT IN IfRINTING-PBESSES dige rigrtntr referat tu it tlgrsr @niet ntcut tnt making part ni tige stmt.

To ALL wHoM 1T MAY eoNonnN: n v

Be it known that I, WILLIAM BnAInwooD, ot` New York, in the countyand State of New York, have invented a new' and useful Improvement in Printing-Presses; `and I do hereby declare the following to'be a.

full, clear, and exact description thereof, whichwill enable those skilled in the art to 4malle and use the sarne reference being had to the accompanying drawing, forming part of this specification, in which drawing-- Figure l represents a sectional side elevation of this invention.

Figure 2 is a transverse section thereof.l

Figure 3 is an elevation of the press, showing the opposite side from that shown in lig. 1.

Similar letters indicate corresponding parts. l

Thisinvention consists inthe arrangement oi' slots in the connection-rods, which impart motion to the platen, in such a manner, that, by the slots in the slotted connection-rods, the platen is permitted to dwell, and thereby suihcient time is gained to adjust the sheets of paper .onthe platen, if the press is worked rapidly;

The invention consists, further, in the arrangement of distinct levers, independent of the platen, in'comf bination with rods connecting with crank-pins, and with other rods connecting with the roller-carriage, in such a manner that the motion of the roller-carriage is entirely independent of that of the platen, and the two motions can be regulated, each for itself', to suit circumstances.

The invention consists, also, in the arrangement ofyielding bearings in the slots ofthe slotted connectionrods which impart motion to the platen, in such a manner that sudden shocks or blows areavoided if -the press is worked rapidly. t y

The invention further consists in the arrangement of' a spring-stop, to `catch and support the platen as the sameapproaches the lowest end of its stroke, thereby preventing sudden shocks or blows.

The invention consists, further, in thc'arrangement of a spring-arm, in combination with a bell-crank lever, and with the rock-shaft which carries the eardldrop,V in such a manner that when the platen moves forward, the

card-drop is held in close contact therewith by the action of the spring-arm, and as the platen reccdes, after the` impression has been taken, the card-drop is raised, and the printedcard permitted to slide oli', and then the cardtlrop is returned to the surface of the platen, ready to receive a new card, v

It consists, furtherkin the arrangement of a chain, extending from the frame to a lever mounted on the end of the rock-shaft, which carries the finger-gin such a manner that when the platen rcecdes, the fingers are raised by the action of said chain, and the printed sheet can be conveniently removed, and a fresh sheet can bc adjusted on the platen, and as the platen advances, the chain becomes slack, and the sheet of paper is held by the iingers while the impression is ta1 I A represents a frame, which is made of lcast iron or any other suitable material, and provided with guideways, a, to receive the rollerfcarriage Bi This carriage receives areciprocating motion by rods which extendv from lovers c to eccentric wrist-pins d, secured to disks e on the ends of driving-shaft C.

The levers c roel: on studs f, which project from the sides ot' the frame A, and their enter ends connect, by rods g, with the rollor-carriage, as clearly shown in the drawing. The connection between the rods b and lovers c will, in practice, he made adjustable, so that the throw of the`rollercarriage can be adjusted.

The platen D is firmly secured to arms 7L, which rock on the studs f, or any other studs fastened in the side pieces ol' the frame A, and the oscillating motion of the platen is produced by rods z', which extend from the wrist-pins rZ to armsj, which project from the`ends of the platen, as shown, said rods being attached to the arms by studs k, which are secured in the ends of said arms. The studs pass through slots Z in the rods t', so that the platen will remain stationary, or have a dwell, during a portion of the revolution of. the driving-shaft C. This dwell takes place when the platen has arrived in its lowest-position, so'that the operator has time to adjust on the platen a fresh sheet or piece of paper, or other material to be printed, while at the same time the roller-carriage continues in its motion, and supplies the types onf the bed with the requisite quantity of ink.

If the press is worked rapidly, the dwell ofthe platen is absolutely necessary'to give the operator time to adjust his paper or sheet; and in order to prevent shocks or blows in the slots of the rods 2', I haveprovided yielding bearings, m, which are fitted' into said slots, being acted upon-by springs, n, as clearly shown in iig. 1 of rthe drawing. These springs are enclosed in a chamber in the ends of their rods, and their tension lor force is adjusted by caps, o, .which screw on the ends of the rods z'. As said rods begin to move in the direction of the arrow marked thereon in iig. 1, the springs u are gradually compressed, and by the time the bearings mhave reached the outer ends of their slots, the force of the springs is such that very little additional power is required to start the platen from its state of'rest. f Y I I When the platen approaches its low-est position, itstrikes the Spring-stop or cushion p, so that all undue strain on the rods z' and wrist-pins d is avoided. In printing cards, I use a card-drop, which consists of a finger, p', provided with a'projecting lip, and attached to the ingershaft g. On one end of this shaft is mounted Yan arm, r, (see rr. 3,) from which extends a spring, s, to the end of a bracket, ,'that is firmly secured to the rear surface of the platen in such a manner, that, by said spring, the ngeror-card-drop p is forced down towards the face of the platen. On the opposite end of the finger-shaft is'mounted a bell-crank lever, u n, one arm, u,

of which is curved, and forms a stop, as will be presently explained, while fromiits other arm, n', extends a stud, w, which acts against the curved spring-arm sr. This arm extends from the frame A, and as the pla-ten moves in towards the bed,-thestud w catches under the outer end of the spring-arm and the card-drop is held in iirm contact with theface of theplaten during thetime the impression is taken. After the impression has been taken, thc platen recedes, and, by the action of the spring-arm :v on the stud w, `the finger-shaft q is turned, and.

the card-drop is raised, so that the card previously bearing against it slides oli' from the platen. This backward motion of the card-drop is limited bythe stop u, which strikes one of the arms j, extendingfromthe platen, or any other portion ot' said platen, and retainsthc nger-shaft, while the stud w glides out from under the springarm After -the stud clears the spring-arm, the card-drop is carried back to the face of the platen by the spring s, or by the weight of the arm u, or by both combined, ready to receive a new card. l

In printing large sheets of paper, the card-drop is replaced by two fingers, which are adjustable on the finger-shaft, to suit the width of the paper. In this case, Iremove the elbow-lever uo from the end of the finger-shaft, and connect a chain, y, to thee'nd of the arm a", (see iig. 3,) the length of the chain being adjusted to suit the convenience of the operator. l As the platen recedes, the chain, which is secured to the frame A, is stretched, and, finally, the finger-shaft is turned back against the action of -its springs, so that the operator has time to remove the printed sheet, and introduce a fresh one, before the platen begins its returny stroke. As the platen approaches the bed, the chain y becomes slack,.and the-ngers bear firmly on the sheet of paper, and retain the same in the proper position whilevthe impression is taken.

Instead of chains y, I propose, also, to usc a hook, secured to the frame, as'shown iu rcd lines zin fig. 3, in such a position that a stud projecting from the arm 1 will strike it'as the platen turns down, and thereby the nger-shaft will be turned, Aand the fingers will be lifted from the platen, but when the platen moves in towards the bed, theA arm 1" will gradually draw away from the end of the hook, and the ngers will close down upon the sheet of paper on the platen. This device I consider as alneohanical equivalent of' the chain y, previously described. I n

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

1'. The levers e, hung independent of the platen, operated as described, in combination with the rods f g, crank-pins cl, and roller-carriage B, substantially as and for the purpose setv forth.

2. The slots Z, in the connection-rods z', provided with bearings m, springs n, and adjusting-screws o, to sperato in combination with the platen D of a printing-press, in the manner and for'the purpose described.

I 3. The spring-arm :5, in combination with the bell-crank lever u v, and card-drop p', substantially as and for the purpose set forth.

WM. BRAIDWOOD Witnesses:

SAML W. Terran, OHAS. WAHLnns.

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