US809748A - Safety device for two-revolution printing-presses. - Google Patents

Description

No. 809,748. PATENTED JAN. 9, 1906. M. ROGKSTROH.

SAFETY DEVICE FOR TWO REVOLUTION PRINTING PRESSES.

APPLICATION FILED AUG- 7. 1905.

2 SHEETS-SHEET 1.

PATBNTED JAN. 9, 1906.

M. ROOKSTROH.

SAFETY DEVICE FOR TWO REVOLUTION PRINTING PRESSES.

APPLICATION FILED AUG. 7, 1905.

2 SHEETS-SHEET 2.7

UNITED STATE S PATENT orrron.

SAFETY DEVICE FOR TWO-REVOLUTION PRlNTlNG-PREssEsl Specification of Letters Patent.

Patented Jan. 9, 1906.

Application filed August 7, 1905. Serial No. 273,151.

To ctZZ 1072,0112 it may concern:

Be it known that 1, MAX Rooxs'rnon, director of the Maschinenfabrik Rockstroh & Schneider Nachf, Actien Gesellschaft, of Dresden-Heidenau, Saxony, in the German Empire, have invented certain new and useful Improvements in Safety Devices for Two- Revolution Printing-Presses, of which the following is a clear and distinct description.

Safety devices consisting of a throw-off lever have become known in connection with platen printing-presses by means of which whenever the hand of the operator comes accidentally in contact with the safety device, and thereby changes its position, the press is thrown out of engagement and the revolution of the fly-wheel arrested, the hand being consequently protected against injury. In two-revolution printing-presses there is risk of injury to the operator whenever the latter attempts at the last moment, while the carriage carrying the form is already in motion, to make level types picks, as they are called, which may happen to stand out somewhat from the general level of the form. If that is done, the operator runs the risk of having his hand caught between the inking and distributing cylinders. In order to obviate this risk, there has been provided, in printing-presses of thetype to which this invention relates, a safety device of a similar character as has already been employed in connection with platen printing-presses, consisting of a rotating throw-off lever, which is fixed in front of the rollers and above the form and the position of which is changed by the hand of the operator coming in contact with it to such an extent that it releases a connecting-rod actuated by a spring, by which means the press is thrown out of engagement and the revolution of the fly-wheel is simultaneously arrested.

Figure 1 of the accompanying drawings is a side elevation, partially in section, on the line a: :r of Fig. 2 of a two-revolution printingpress provided with the safety device in accordance with the invention. Fig. 2 shows a plan of the safety device. Fig. 3 shows in elevation, and Fig. 4 in verticalsection, on the line y y of Fig. 3 the position of the brakelever of the fly-wheel.

. The throw-off lever a is rotatably mounted by pivots I), fixed to the frame of the press. The horizontal arm of the lever a lies so closely above the form that there is not sufficient space for the hand of the operator to pass between it and the form without touching the lever. A connecting-rod A, one end of which moves in a sleevef 011 the frame, while its other end is flexibly connected with a lever g, by means of which the press is uncoupled and again put in engagement, runs along the side pivoted end of the bearing-arm of the throw- 7 off lever (1, projects beyond the edge of the disk at when the press is in engagement and keeps the spring 0 under tension. The lever g is rigidly connected with the vertical rocking shaft 72, which for the purpose of enabling the press to be put in engagement is provided at its upper end with a handle 1". The forked lever Z, rigidly mounted upon the rocking shaft h, engages with its fork a pin on the bar n of the belt-fork, the end of which in proximity to the fly-wheel is provided with a camlike projection i, that actuates the brake-lever 0 of the fly-wheel. The brake-lever 0 is a bell-crank lever mounted to oscillate in a block or in the frame, one arm of it being pressed by means of a spring against the camlike projection of the bar n. The bar it in moving to and fro raises and lowers the free arm of the bell-crank lever 0, the lever itself being turned in its bearings, while the other arm compresses or expands a brake-ring arranged within the fly-wheel and so arrests the revolution of the latter at the same time with the press being thrown out of engagement or releases it again when the press is again coupled.

The mode of operating the device is as follows: If after the press has been started the hand of the operator should come in contact with the throw-off lever a, the latter will be pushed in the direction of the press, with the result that the pressing of the hook 0 down and releasing the disk d. The connectingrod A, actuated by the spring 0, presses forward and by means of the lever 9 turns the rocking shaft h, and the forked lever Z with it, in such a manner as to cause the latter to shift the bar it with the belt-fork m and the cam-like projection i in proximity to the fly Wheelto the lift. This results in the belt being shifted from the rigidly-mounted pulley p to the loosely-mounted pulley g-that is to say, the press is thrown out of engagement. The cam-like projection i on the bar a is at the same time brought beneath the brake-lever and by actuating the same effects the stopping of the fly-Wheel. If it is intended to place the press again in engagement, it is necessary to turn the handle 1", and consequently the rocking shaft h, in the opposite direction. By doing so the connecting-rod A is pushed back into its initial position and the spring 0 is again put under tension, While the disk (1 is caused to lie against a lateral projection on the arm of the safety-lever, and so pushes the latter back into its upright position. Thereupon the hook a Will again pass in front of the disk 65 and retain the connecting-rod in the coupling position, the free arm of the bell-crank lever 0 being simultaneously lowered and the connection between the brake-ring and the fly-Wheel uncoupled in this manner.

device and adapted to be actuated by the throw-off lever. v

2. In a safety device for printing-presses, a throw-off lever having an arm projecting over the form of the latter, a belt-shifting element having a braking device for the fly-Wheel of the press, a springcontrolled rod engaging the belt-shifting element, and means for setting the rod in an operative position, said throw-off lever maintaining the rod in a set position and adapted to release the same When the hand of the operator is brought in contact therewith. 1

3. In a printing-press, a safety device including a throw-off lever adapted to extend over the face of the form of the press, a beltshifting device, a brake member cooperative With the latter for arresting the fly-Wheel of the press, a spring-actuated rod connected With the belt-shifting element, and a handoperable lever for setting the rod in an operatlve position, said throw-off lever adapted to release the rod for operating the belt-shifting element and brake member When the handof the operator contactswith said throw-off lever.

In testimony whereof I have hereunto set my hand in presence of tWo subscribing Witnesses.

MAX ROGKSTROH.

Witnesses:

PAUL E. SoHILLING, PAUL AREAS.

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