US284947A - Printing-machine - Google Patents

Description

(No Model.) 3 Sheets-Sheet 1,

J. H. CRANSTON.

PRINTING MAGHINE.

No. 284,947. Patented Sept. 11, 1883-.

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- (No Model.) 3 Sheets-Sheet 2 J. H. GRANSTON.

PRINTING MACHINE.

No. 284,947. v Patented Sept. 11, 1883.

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3 t 6 m M S t e 6 h S 3 N 0 T S N A R O H u a d 0 M 0 m PRINTING MACHINE. No. 284,947.

Patented Sept. 11, 1883.

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JOHN H. ORANSTON, OF N ORWVIOI-I, CONNECTICUT.

PRINTING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 284,947, dated September 11, 1883. Application filed February 8, 1883. we model.)

T0 aZZ whom it may concern:

Be it known that I, JOHN H. CRANSTON, a citizen of the United States, residing at Norwich, in the county of New London and State of Connecticut, have invented certain new and useful Improvements in Printing-Machines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains'to make and use the SitlllO.

This invention relates to improvements in printing-machines, the object being to provide a simple and effective means of promptly stopping the revolutions of the impressioncylinder and reversing or setting the same back to any desired point when required.

The invention consists in the construction and arrangenient'of parts, as hereinafter described and claimed, for applying friction to the periphery of a fast pulley on the drivingshaft after the belt has been shifted therefrom to a loose pulley on the same shaft, whereby the motion of the fast pulley derived from the momentum of the balance-wheel and impression-cylinder is promptly arrested and the impression cylinder stopped at once through intermediate gearing, or set back to any desired point for starting again, without liability of passing across the type or spoiling the sheets.

In the annexed drawings, illustrating the invention, Figure 1 is a side elevation of a portion of a cylinder-press with my improve ments attached. Fig. 2 is a plan view of the mechanism for stopping and reversing the cylinder. Fig. 3 is an end elevation. Figs. 4c, 5, and 6 are modifications to be hereinafter explained. I

Like letters indicate like parts.

A represents a portion of the frame-work of an ordinary cylinder-press.

B is the driving-shaft.

O G are pulleys or driving-wheels, one fast and the other loose on the shaft. By shifting a belt, which connects with a suitable motor, from one of these pulleys to the other the shaft B may be rotated or not at pleasure.

D is a pinion secured to the-shaft B and meshed with a gear, E, .which in turn meshes with a large gear-wheel, F, that rotates the impressioncylinder. The gears D, E, and F are shown by dotted lines in Fig. 1. The impression-cylinder is not shown in the drawings.

G is a balancewheel on the driving-shaft.

In order to stop the press and back the cylder up to the proper place to start again, I employthe mechanism described, as follows: A lever-frame, H, Figs. 1, 2, and 3, is pivoted to a standard, I, and projects above the pulleys O G. In this frame are journaled shafts K L, each of which carries a fricti0n-roll, M

N, arranged to bear, respectively, on the pulley beneath, and a gear, 0 or P, that meshes with the corresponding gear on the other shaft. These friction-rollers N M, one of which is thus supported above the fast pulley O and the other above the loose pulley O, are composed of rubber or other suitable material. The shafts K L, on which the friction-rolls M N are mounted, being provided with gears O P, that intermesh, as shown, it will be seen that the revolution of the roll M in one direction causes the roll N to revolve in the opposite direction, and by hearing on the fast pulley 0 stop the revolution of the impressioncylinder an d back it to the proper position to be started again. The frictionrolls N M are normally held from contact with the pulleys O O by means of a rod, J, that connects the lever frame H with a crankarm, Q, 011 a rockshaft, R, which rock-shaft is provided with an arm, S, carrying a weight, T, that rotates said shaft sufficiently to cause the crank-arm Q and rod J to raise the pivoted lever frame H and hold its friction-rolls from contact with the pulleys. The rock-shaft R is connected by a lever, U, with a vertical rod, V, that carries a treadle, WV, at its upper end in reach of the operator. It will be seen that by pressing upon the treadle IV the rod V and lever U will impart a partial rotation to the rock-shaft It, thereby causing the arm Q and rod J to draw the frame H down sufficiently to enable the rolls M N to exert a frictional pressure upon the pulleys O O, and the belt having been previously shifted from the fast pulley to the loose one the motion of the latter pulley will be transmitted through the friction-rolls and intermediate gearing to the fast pulley, driving-shaft and cylinder gearing, thereby to the length of time in which the friction-rolls are held against the pulleys.

It is obvious that the precise mechanism for actuatingthe roller-frame H, as described, may be varied without affecting the operation of the friction-rolls.

Vhen the treadle V is relieved from pressure, the weighted arm S and crank-arm Q on the rock-shaft R will actuate the rod J and frame H, so as to raise the friction-rollers M N from the pulleys C O; and aspring, X, may,

I if desired, be placed on the tr-eadle-rod V, above the bearing Y, for the purpose of assisting the return movement of said rod.

Instead of employing a weighted arm, S, to rotate the rock-shaft, and thereby cause the rod J to hold the frame H up, said frame may be supported by a spring or springs in any convenient manner.

The lever-frame E, instead of being made in the form shown in Figs. 1, 2, and 3, may be constructed and fulcrumed in the manner shown in Fig. 4, the rolls M N, however, be-

ing arranged to bear, respectively, on the loose and fast pulleys, as already described.

The operation of the above-described devices for stopping and backing the impression-cylinder will be readily understood. The cylinder is driven by gearing from the shaft B, which receives its motion by belting to the fast pulley C. \Vhen it is desired to stop the impression-cylinder, the driving-belt is shifted to the loose pulley O, and in order to overcome the momentum of the cylinder and balance-wheel and bring the press toa stop the lever-frame H is pressed down by the mechanism described, or by other suitable means, so as to cause the friction-rollers N M to bear on the pulleys G C, respectively. The friction-roll M now takes motion from the loose pulley O and transmits motion through the gears P O to the friction-roll N, that bears on the fast pulley 0, thereby stopping the same, and by continued pressure causing the fast pulley to reverse the direction of its motion, so as to back the impression-cylinder to the desired point.

It is obvious that the same effect will be produced by arranging the friction-roll M so as to bear against the driving-belt Z and take motion therefrom, instead of from the loose pulley. In this case the friction rollers M N may be arranged to bear on either side of the belt, as shown in Figs. 5 and 6, an intermediate gear, 1?, Fig. 6,-being employed if the roller M is made to bear on the inner side of the belt. It will be seen that in this modified form of device, Figs. 5 and 6, after the belt Z has been shifted from the fast pulley Oto the loose pulley G and the frame H brought down into proper .position, the friction-roller M will take motion from the belt, and by imparting rotation through the intern'iediate gearing to the roller N will cause the latter roller, which bears 011 the fast pullcy.O, to transmit motion thereto in a reverse direction, thus stopping or setting back the same, together with the im pressioncylinder geared'thereto. \Vhen the impression cylinder has been stopped and hacked to the desired point, it can be again started by raising the friction-rolls and shifting the driving-belt from the loose pulley to the fast pulley.

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

1. In aprinting-press, the combination, with the driving-shaft 13, carrying fast pulley G and loose pulley G, of the shafts K L, mounted in a frame, H, and carrying friction-rolls N M, and gears O P, substantially as described.

2. In aprinting-press, the combination, with the impression-cylinder, the gears F, E, and D,

and the driving-shaft 13, having fast pulley C, loose pulley O, and suitable belting, of a leverframe, H, friction-rolls M N, supported on shafts K L, journaled in said lever-frame, and gears l? O, mounted on said shafts, whereby friction may be applied to the fast pulley for the purpose of stopping or reversing the rotation of the cylinder, substantially asv described. In testimony whereof I affix my signature in presence of two witnesses.

JOHN H. ORANSTON.

"Witnesses:

LUoIUs BROWN, DONALD G. PERKINS.

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