US257577A

US257577A - Sheet-delivery apparatus for printing-presses

Info

Publication number: US257577A
Authority: US
Publication date: 1882-05-09
Anticipated expiration: 1899-05-09

Description

(No Model.) 3 Sheets-Sheet 1. J. T. HAWKINS.

SHEET DELIVERY APPARATUS FOR PRINTING PRESSBS. No. 257,577

Patented May 9, 1882.

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Patented May 9, 1882.

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- UNITED STATES PATENT O EIcE.

JOHN T. HAWKINS, OF TAUNTON, MASSAGHUSETT$.

SHEET-DELIVERY APPARATUS FOR PRINTING-PRESSES.

SPECIFICATION forming part of Letters Patent No. 257,577, dated May 9, 1882.

Application filed November 26,1880. (No model.)

To all whom it may concern Be it known that I, JOHN T. HAWKINS, of Taunton, in the county of Bristol and State of Massachusetts, have invented a new and useful Improvement in Sheet-Delivery Apparatus for Printing-Presses, which improvement is fully set forth and illustrated in the following specification and accompanying drawings.

The invention consists in the employment of frictional-surfaced sheet-driving wheels driven at the same peripheral velocity as that of the impression-cylinder, and so placed as to touch or act upon the unprinted margins of the sheets of paper only, the said frictional surfaced wheels being combined with both stationary and movable sheet-guides, in part surroundin g and touching, or nearly touching, the frictional peripheries of said wheels.

The invention also consists in the employment of an air-pump or equivalent means of forcing a current or jets of air, either horizontally or downwardly, upon the sheets of paper as the same are being delivered from between the frictional-surfaced sheet-driving wheels and their partially-surrounding guides.

This invention and its necessary adjuncts are described in detail as follows:

In the accompanying drawings, Figure 1 illustrates in side elevation the parts constitutin g this invention as applied to a cylinderpress, together with such other parts of the press as are essential to the illustration of the invention. Figs. 2 and 3 illustratein end elevation and plan, respectively, the press shown in Fig. 1; and Figs. 4, 5, and 6 illustrate details of the invention to be hereinafter described.

In the said figures, the letters A A indicate parts of the side frames of a cylinder-press, the letter B the impression-cylinder, and O the feed-board.

0 indicates the fly-board, and D the shaft, carrying the cylinder-grippers 3 in the usual manner.

D and d indicate respectively the cam and spring with its rod, for operating the grippers y when engaging their opening-stud d and their closing-stud (1 E indicates a shaft extending across the cylinder, carrying a series of sheet-lifter fingers,

spring, W, on the inside of theflange of the cylinder-head. The pin g engages the stationary cam F, secured to the frame of the machine, in passing up whose inclined face said pin lifts the sheet-lifter fingers f simultane ously with the opening of the cylinder-grippers y.

A indicates a shaft journaled in the frames of the press, and carrying inside the frames two or more narrow sheet-driving wheels, a, having an elastic frictional surface of rubber or other suitable material, 0., upon their peripheries, preferably in the form shown in Fig. 4, in which segments of sheet-rubber a are held to the conical or beveled faces of the wheels a by means of the clamps c and screws a The rubber is thus presented edgewise t0 the sheet. Any deflection or stretching that may be exerted upon said rubber segments will tend outwardly, thereby keeping the sheet tightly stretched in a direction across the press, as but two of the wheels a are generally used, and then so placed as to come in contact with the outer margins of the paper only.

It indicates a rod extending across the press and secured in .the frames A A, upon which are secured the sheet-guides R by means of setscrews, so that said guides may be set at any desired point in the width of the press to suit the size of sheet to be printed, the said guides" forming 011 their respective inside curves a circular arc corresponding to the peripheries of the sheet-driving wheels cm. The number of the guides R to be used depends upon the width of press or sheet to be printed.

S indicates a shaft extending across the machine and journaled in the frames A. The said shaft carries between said frames, secured to it by set-screws or other suitable means;

part of the periphery respectively of each of the sheet-driving wheels a. The said movable guides, as well as the stationary guides 1t,are polished on their interior curved surfaces, so that the back of the sheet will slide freely upon them, while the pressure or friction of the elastic wheels upon the margins of the last.- printed side conveys each sheet to its point of dischargetherefrom. Thesheet-drivingwheels a are placed in line with the corresponding sheet-guides, R and S, the said wheels being capable of adjustment across the machine, as are also the said guides. On a continuation of the shaft A outside of the frame of the machine is secured a pulley, c, and upon the impression-cylinders axis a corresponding pulley, c, is secured, said pulleys being so proportioned as to give to the frictional-surfaced sheet-drivin g wheels to and the impression-surface of the cylinder B the same peripheral velocity. The shaft A is-so placed with reference to the axis of the cylinder B that the frictional peripheries a of the wheels (1 will press lightly upon the impression-surface of the cylinder B, a crossed belt or equivalent gearing giving these respective surfaces motion in the same direction and at the same velocity.

To the shaft S, outside of one of the frames A, is secured an arm, 8. Connected to said arm in the usual manner is a connecting-rod, 9, whose opposite end is forked, which end, acting as a guide, encompasses the axis of the cylinder B. The said rod is provided with a roller, h, which engages with and is operated by a cam, 'i, adjustably secured to the axis of the cylinder B. By means of the said cam and rod the movable sheet-guides S are operated.

1? indicates a single-acting air-pump without valves, which is secured to one of the frames A, the bottom chamber of which pump communicates with a pipe, 19, extending across the press and having its end closed. The pipe 1) is perforated with small holes 12 pointing either horizontally or downwardly upon the fly-board G. A connecting-rod, 12, connects the plunger 1? of the pump P with a bellcrank lever, L, the short arm of which lever carries a roller, h, which engages a cam,'i, adjustably secured to the axis of the cylinder B. By means of the said cam and crank-lever the air-pump plunger 1 is given its forward motion.

S indicates a spring whose lower end is attached to any suitable point of the frame of the press and its upper end to the short arm of the lever L, through which arm said spring effects the return of the plunger P. A series of sheet-stops, jj, are attached to the fly-board C. Said stops and board together are adj ustable lengthwise of the press, for the purpose of exactly locating the advancing edge of the sheet when released by the movable sheetguides S.

The complete operation of this machine, which is extremely simple, is as follows: The sheet to be printed, being taken from the feedboard in the usual manner by the cylindergripgers y, which clamp the leading edge of the sheet over the points of the lifter-fingers f is carried around to the type-bed and through the process of receiving the impression. Upon arriving at the point a; of the stationary sheet-guides R the grippers 3 release the sheet by the engagement of the grippertumbler cam D with the opening-stud d, the sheet at this point being kept from dropping back upon the form bybeing held between the cylinder B and the periphery a of the sheetdriving wheels a, the advancing edge of the sheet having passed their point of contact before the grippers open. Simultaneously with the opening of the grippers 3 the lever f is operated by the cam F, which causes the sheetlift up from the cylinder-surface the advancing edge of the sheet, which edge is thus passed between the sheet-drivin g wheels at and the stationary sheet-guides It, and the sheetthereby continued in one round of motion until its advancing edge reaches the stops jj, at which time, by the proper adjustment of the cams t and if, jets of air are projected by the air-pump P through the perforationsin pipe 1;,the movable sheet-guides S at this time being thrown into the position shown in dotted lines in Fig. 1, thus releasing the sheet, which is then spread out upon the fly-board O, or upon the pile of paper upon it, by the obvious action of the air-jets issuing at this time from the perforated pipe 19.

By the method of delivery above described each sheet is delivered with its last-printed side upward without the use of tapes or cords,without the necessity of having a leading margin of sheet so wide as to overhang the gripperedge of the impression-cylinder, and Without bringing any part of the printed surfaceof a sheet in contact with any part of the delivery mechanism, while at the same time the greatest facility is afforded for access from the back of the press to the form by simply slipping to one side (by slackening their set-screws) the intermediate movable sheet-guides, S, where such intermediate guides are used. It is quite obvious, also, that by this method of delivery the total length of space occupied by this press is less than that occupied by presses having a fly delivery to the extent of the total length occupied by the longest sheet capable of being delivered by the press.

I do not limit myself to the means herein shown and described for imparting the requisite movements to the sheet-lifter fingers f the fric tional sheet-driving wheels a, the sheet-guides R and S, and the air-pump P, as the means for imparting said movements may be varied to suit the particular form and proportions of press to which such parts may be attached, without departing from the principles of this invention, and any of the well-known devices for effecting like motions may be employed as may be most convenient to the end sought.

I do not herein claim as new, per 80, any of the mechanism shown and described for effect ing the above-mentioned movements; but,

As of my invention, I claim- 1. In a cylinder printing-press or other machine requiring a similar disposition or delivery of 'sheets of paper therefrom, the combination of sheet-driving wheels, stationary sheetguides, and movable sheet-guides, arranged and operating substantially as and for the purposes set forth.

2. In a cylinder printing-press or other machine requiring a similar disposition or delivery of sheets of paper therefrom, sheet-driving wheels and stationary and movable sheet; guides, in combination with means, substantially as described, to force a current or jets of air over or upon the sheets as delivered, substantially as and for the purposes set forth.

3. In a cylinder printing-press or'other machine requiring a similar disposition or delivitil movable sheet-guides,afl y-board providedwith sheet-stops, and means, substantially as described, to force a current of air over or upon the sheets in course of delivery, all arranged 3 5 and operating substantially as and for the purposes set forth.

JOHN T. HAWKINS.

'Witnesses:

HORA'IIO 0. KING, 1?. R. VOORHEES.