US668350A - Driving apparatus for printing-machines. - Google Patents

Description

No. 668,350. Patented Feb. l9, 19m.

6. a; w. GIESECKE. DRIVING APPARATUS FOR PRINTING MACHINESK (Application filed Mar. 23, 1900.)

(No Model.)

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N No. 668,350. Patented Feb. l9, I90l. a. a w. GIESECKE. DRIVING APPARATUS FOR PRINTING MACHINES.

(Application filed Mar. 23, 1900..

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(No- Model.)

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UNITED STATES ArnNr Urrrcn.

GEORG GIESEOKE AND WALTER GIESEGKE, OF LEIPSIG, GERMANY.

DRIVING APPARATUS FOR PRINTING-MACHINES.

SPECIFICATION formingpart of Letters Patent No. 668,350, dated February 19, 1901.

Application filed March 23, 1900. Serial No. 9,911. (No model.)

T0 at whom it may concern.-

Beit known-that we, GEORG GIESEGKE and WALTER GIESEOKE, subjects of the Emperor of Germany, and residents of Leipsic, Germany, have invented certain new and useful Improvements in Printing Machines, (for which we have obtained patents in Germany, dated September 10, 1899, Nos. 115,550 and 115,551,) of which the following is a specification.

In the usual construction of two-revolution cylinder printing-machines the printing-cylinder receives its motion from the main driving-shaft by means of an intermediate gear- Wheel which turns upon a supporting-shaft rigidly attached to the frame of themachine. In machines of this type the cylinder is usually raised when not in the act of printing and is lowered to make the impression-that is to say, the cylinder rises and falls once for each impression made. Owing to this movement the gear-wheel on the end of the cylinder-shaft does not perfectly mesh with the intermediate gear-wheel when the cylinder is raised, and the result is that considerable lost motion and backlash occur during a part of the action of the cylinder. Up to this time little significance has been attached to this defeet in this class of machines, probably because it was supposed that it was quite sufficientif the cylinder gear-teeth during actual printing were in normal contact-'. 6., that the teeth touched one another in the pitchlines; butthe cylinder, as well as the mechanism connected with it, has also, when the impression has taken place and the cylinder is in the elevated position, various functions to perform which are of importance for the work of the machine-as, for example, the opening and closing of the grippers, the raising and lowering of the laying-on gages, the

lifting and lowering of the sheet-holder, the

action of the fliers, &c. All these functions are dependent upon the cylinder, and therefore its motion influences them all. We have found that these functions in the two-revolution machines are not executed with the regularity and smoothness which is absolutely indispensable to a faultless impression, and the cause of the disturbances in the action of the mechanism dependent upon the cylinder we have discovered to be the circumstance that the cylinder'wheel during a part of its revolution does not perfectly fit into the cogs of the driving-wheel. For these reasons we have devised and applied an improvement to the two-revolution machines which secures complete equality of interpenetration between the teeth of the wheels whether the cylinder be raised or lowered.

In carrying out our invention we mount the intermediate gear wheel upon a movable shaft and provide automatic means for moving this shaft and gear-wheel relatively to the main drivinggear wheel and the cylinder gear-wheel in a manner to secure the smooth and uniform action ofthe machine at all times during the different positions of the cylinder.

In the accompanying drawings, Figure 1 is a side elevation of that portion of a printingmachine to which our invention relates and showing one form of our invention applied thereto. Fig. 2 is a vertical section on the line A B, Fig. 1. Fig. 3 is a side elevation of a modified form of our invention. Fig. 4: is an elevation and partial section on the line C D, Fig. 3. Fig. 5 is an elevation of another modification of our invention. Fig. 6 is an elevation and partial section on the line E F, Fig. 5.

Like numerals of reference designate like parts wherever they occur in the diiferent views.

Referring to Figs. 1 and 2, the numeral 1 designates the main driving-gear, 2 is the intermediate gear, and 3 the cylinder gear- Wheel. The gear-wheel 1 is rigidly fixed to the main driving-shaft 4:. The intermediate gear-Wheel 2 is mounted upon a stub-shaft 5, and the gear-wheel 3 is keyed to the cylinder-shaft. Toggle-levers 7 are jou rnaled upon the main shaft 4 at one end 7, and their opposite ends 7 are loosely mounted upon the stub-shaft 5. A toggle-arm 8 has a bearing 8, loosely journaled upon the stub-shaft 5, and at its opposite or upper end a bearing 8 is mounted to turn on the cylindenshaft 6.

As shown in Figs. 3 and 4, a double elbowlever 7 8 is fulcrumed upon the main shaft 4, and the two members 7 of this lever are journaled upon the stub-shaft 5, while the members 8 of said lever have journaled between them upon a pin 10 an eccentric-arm 11. A cam or eccentric 13 on the end of a shaft 12 has a bearing in the lower end of the end of a connecting-rod 17, the upper end of' which is journaled upon the cylinder=shaft 6. The operation of this construction is such that as the cylinder is raised by the cam 16 and the connecting-rod 17 the intermediate gear-wheel is moved by the cam 13 to a position under the gear-wheel 3. It will be understood that these relative movements are properlytimed, so that the intermediate gearwheel 2 moves in and out as the cylindergear 3 rises and lowers and the teeth of the gear- wheels 2 and 3 are always properly in mesh, preventing lost motion and backlash.

As shown in Figs. 5 and 6, an adjustable cam 14 surrounds the end of shaft 12 and has a bearing in the lower end of an arm 18, fulcrumed on the main shaft 4. The cam 14; may be adjusted to regulate the throw of fork '7, which carries the intermediate gear-wheel 2. The remaining parts shown in Figs. 5 and 6 are substantially the same as shown in Figs. 3 and 4 and operate in the same manner.

It will be obvious from the foregoing that as the cylinder is raised and lowered the intermediate gear-wheel 2is always in close mesh with the wheels 1 and 3, thus insuring a smooth and regular movement without 6 backlash, noise, or lost motion.

Having thus fully described our invention, what we claim is 1. In a printing-machine, a main drivingshaft, a gear-wheel thereon, an impressioncylinder having a gear-wheel fixed to its shaft, an intermediate gear-wheel in mesh with the gear on the main shaft and the gear on the cylinder-shaft, and means for moving the intermediate gear-wheel in and out as the cylinder raises and lowers, to insure the proper mesh of the gear-teeth, substantially as described.

2. In a printing machine, a main gear- Wheel, a gear-wheel on the impression-cylinder, an intermediate gear between said two gear-wheels, toggle-arms for moving said intermediate gear wheel as the cylinder is raised and lowered, and means for raising and lowering the cylinder.

In testimony that we claim the foregoing as our invention we affix our signatures in presence of two witnesses.

GEORG GIESECKE. WALTER GIESECKE.

Witnesses:

RUDOLPH FRICKE, CHAS. J. BURT.

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