US290267A - Printing-press - Google Patents

Description

- 4 Sheets-Sheet 1.

- (No. Model.)

G. W. PROUTY. PRINTING- PRESS.

No. 290,267. Patented 1100.18, 1883.

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G. W. PROUTY.

PRINTING PRESS.

N0.-290;267. v a PatentdDeo. 18, 1883.

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G. W. PROUTY.

, PRINTING PRESS. No. 290,267. Patented Dec. 1 1883.

. Witfwscs: I Inventor:

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, GEORGE W. PROUTY, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO THE PROUTY PRESS COMPANY, OF HARTFORD, CONNECTICUT.

PRINTING-PRESS.

SPECIFICATION forming part of Letters Patent No. 290,267, dated December 18, 1883.

Application filed June 3, 1882.

To all whom it mag concern.-

Be it known that I, GEORGE W. PROUTY, of Boston, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements in Printing-Presses, of which the following, taken in connection with the accompanying drawings, is a specification.

My invention relates to that class of printing-presses in which the platen is moved to and from the bed about an axis located below said platen, and to that division of said class in which both the platen and the bed are vibrated; and it consists in certain combinations and arrangements of the devices for operating the platen and bed, and the grippers for holding the sheet to be printed in place upon the platen, which will be best understood by reference to the following description of the drawings, in which- Figure 1 is a front elevation of my improved press. Fig. 2 is a side elevation. Fig. 3 is a vertical section on line 00 w on Fig. 1. Fig. 4 is a side elevation of the gripper-frame; and Fig. 5 is an end elevation of the same, illustrating a modification in the devices for maintaining it in its normal position.

A is the frame of the machine, cast entire in one piece, and provided with bearings to receive the shafts B, C, and D, and with ears, to which is secured the feed-table E.

F is the type-bed, providedwith the downwardly-projecting arm F, through the lower end of which passes the shaft B, held in a fixed position in its bearings in the frame A,and about the axis of which said bed may be vibrated. The bed F has cast upon its rear side the deep longitudinal rib F terminating at its rear in the long, sleeve-like hub F through which extends the shaft, G, to each end of which is firmly secured one end of a draw-bar, H, the opposite end of which is fitted to the crank-pin a set in the crank I or in the gearwheel I, said crank and gear -w]1eel being firmly secured upon opposite ends of the shaft 0, as shown in Fig. 1. 'The bed F is further strengthened by the two longitudinal ribs b and b and thetransverse ribs 0, c, and c and is provided with means forsecnring there to the chase d.

J is the ink-distributing disk, mounted in an oblique positiogin a bearing in the stand (No model.)

bed F. said disk being provided with the usual ratchet-teeth upon its back side, with which the pawl c, pivoted to the lever f, acts to im u part thereto an intermittent movement about its axis in the direction indicated by the arrow, when the bent arm f of said lever f is depressed. The lever f is mounted loosely upon the spindle of the disk J, about which it is moved in one direction by the contraction of the spring 9 connected at one end to the short arm of said lever f and at theother end to a pin set in the stand J, as shown in Fig. 2. The lever f is moved in the opposite direction by contact therewith of the plate-like tie K of the ink-roller-carrying frame K, mounted upon and arranged to be vibrated about the' shaft G as the bed F is vibrated by means of the link L, pivoted at one end to the frame A of the machine and at the other end to the roller-frame K, as shown in Fig. 2.

M is the platen, of ordinary construction, and adjustably secured to the yoke M in a well-known manner. The yoke M has cast thereon two arms, M by means of which it is mounted upon and adapted to be vibrated about the shaft B by the action of the cams N N, mounted upon the shaft C, upon the trucks N, mounted in forked bearings in cars h cast upon the back of the yoke, as shown in Figs. 2 and 3. The cams N N are so constructed and arranged as to apply power directly behind the platen to move it toward the bed and give the impression, with a short standstill while the impression is being given, and a much longer standstill or dwell when the platen is farthest from the bed, for the purpose of giving time for the feeding of the sheet.

Motion is imparted to the shaft C and through it to the platen and bed by. means of the treadle O, connecting-rod O, crank 0 shaft D, and the pinion P, which latter engages with the gear-wheel I on the shaft C.

The, gripper-fingers M are adjustably secured to the grippenframe Q, cast in one piece, and having its two arms, j j, forked or slotted to embrace the shaft B,'to which it is secured by the pins 70, as shown in Figs. 2 and 5. The gripper-frame Q is held in its normal position, or intermediate between the platen and bed, by means of a spring, Z, and pivoted step m, as shown in Fig. 2, or by two opposing springs, land Z, as shown in Fig. 5, in which latter case the gripper-frame Q, is provided with an arm, a, as shown. 5 The shaft D has secured upon its left-hand end the fly-wheel It, as shown.

The platen yoke, bed, and gripper frame are all mounted upon the same shaft, B, and vibrate about a common axis, which reduces the cost of construction very materially, and hence is considered an important feature of my invention.

The bringing of the grippers down upon the tympan-sheet for the purpose of adjusting the gripper-fingers to the size of the sheet to be printed is done, in case of the arrangement shown in Fig. 2, by simply turning the pivoted stop or into the position indicated in dotted lines when the gripper-fingers willfall of their own weight upon the face of the platen or upon the tympan-sheet. Vhen the grippers have been properly adjusted the gripper-frame is raised to its normal position and the stop on is turned back to the position shown in full lines in Fig. 2,where it is held (till forcibly turned) by the pin 0.

In the ease of the arrangement of gripperframe shown in Fig. 5 it is maintained in its normal position by the opposing tensions of the springs Z and Z, and when it is desired to adjust the gripper-fingers to the size of the sheet they are forcibly brought down upon the sheet by the operator, the spring Z being extended and the spring Z being contracted by the operation, and when the pressure is removed the grippers immediately assume their normal position again with the springsl and Z of even tension, where they remain until struck by the platen in its upward movement, when the gripper-fingers will move toward the bed with the platen pressing hard upon the sheet while the impression is being given by virtue of the tension of the spring Z, which expands to permit the movement of the grippers toward the bed, as described. As the platen reeedes from the bed, the grippers, still pressing hard upon the sheet, move with it until they have reached their normal position, when the motion of the grippers ceases, and the platen moves away from them to the position shown in Figs. 2 and 3.

Another important feature of my invention is the means employed to operate the platen and bed, by which a very powerful press, having the advantage of a long dwell of the platen for feeding the sheet, is obtained with a comparativel y light frame.

I am fully aware that cams have been used for imparting motion to the platen by acting 60 upon the end of a pivoted lever or levers;

but this arrangement was found to be objectionable on account of the spring of the lever or levers, and the consequent great weight of metal that it was found necessary to use in said levers.

I am also aware that cams have been used to vibrate the bed in combination with a platen vibrated by means of a crank; but this arrangement was found to be unsatisfactory, for the reason that the sheet had to be removed from the platen and a fresh one fed thereto while the platen was in motion, as it could have no real dwell when driven by a crank. I do not therefore claim, broadly, operating the platen of a printing-press by means of a cam, nor do I claim, broadly, the combination of a cam with the draw-bars of a printingpress; but

What I claim as new, and desire to secure by Letters Patent of the United States, is-

1. The combination, in a printing-press, of a type-bed and a platen both mounted upon and adapted to be vibrated about the same shaft mounted in fixed bearings, a cam arranged to act upon and impart an intermittent motion to said platen, a pair of cranks mounted upon and operated by the shaft of said cam, and a pairof draw-bars connecting said cranks and the type-bed, substantially as and for the purposes described.

2. The combination, in a printing-press, of a type-bed and a platen-yoke both mounted upon and adapted to be vibrated about the same shaft mounted in fixed bearings, and mechanism, substantially as set forth, for imparting simultaneously a vibratory motion to both platen and bed, substantially as described.

3. In a printing-press, a platen-yoke, a type-bed, and a gripper-frame all mounted upon and adapted to be vibrated about the same shaft mounted in fixed bearings, in com bination with mechanism, substantially as set forth, for imparting to said platen and bed simultaneously a vibratory motion toward and from each other, substantially as described.

4.. The combination of the gripper-frame Q, the spring I, and the pivoted stop m, adapted to limit the movement of said gripper-frame toward the platen and to be moved out of the way to permit the gripper-fingers to be brought down upon the platen, substantially as andfor the purposes described.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses, on this 26th day of May, A. D. 1882.

GEO. IV. PROUTY.

W'itnesses:

N. C. LOMBARD, \V. E. LOMBARD.

IIO

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