US341788A - Method of freeing paper from electricity - Google Patents

Description

(No Model.)

J. McKEEN ARNOLD.

METHOD OF FREEZING PAPER FROM ELECTRICITY.

' Patented May 11, 1886.

o tates the time and services of an additional UNITED STATES PATENT OFFICE,

METHOD OF FREEING PAPER FROM ELECTRICITY.

SPECIFICATION forming part of Letters Application died February 23, 1886 1'0 all whom it may concern:

Be it known that I, JAMES McKEEN AR- NOLD, a citizen of the United States, residing. in Philadelphia, Pennsylvania, have invented 5 a certain Method of Freeing Paper from Electricity, of which the following is a specification.

The object of my invention is to free paper from electricity in printing, and thereby prevent what is termed the set-off from one printed sheet to another as they are delivered from the press; and this objectl attain in the manner which I will now proceed to describe.

In the accompanying drawings, Figure l is a side view of suflicient of a printing-press to illustrate my invention, and Fig. 2 is a diagram plan.

It is frequently found that in printing, more especially on paper which has been highly 2o calender-ed, the paper contains so much static electricity that as one sheet is laid on the top of another there will be such attraction between the two that the fresh impression on one sheet will be transferred or set off onto the other, and to meet this dit'iiculty it has been customary to introduce what is termed "slip-sheets between the printed sheets as they come from the press; butlhis, aside from the additional material required, also necessioperative. To meet this difficulty I free the paper from electricity as it comes from the press by projecting steam onto the printed sheets as they are delivered from the press 5 onto the tly-table.

In the accompanying drawings, A is the frame of a printing-press, B the impressioncylinder, and D the reciprocating bed, while E is the delivery-roll for the printed sheets,

Patent No. 341,788, dated Mayll, 1886,

Serial No. 192869. (No model.)

intervals along the outer face of this pipe H U are perforations in such positions as to direct jets of steam out onto the sheets of paper as they are delivered from the press and laid onto the receiving or fly table T, Figs. 1 and 2. By this means steam is thrown onto the successive printed sheets to furnish sufficient moisture to act as a conductor in carrying off and dissipating the electricity in the paper, and preventing the clinging of the sheets together, and the consequent set-oft of the impression on one sheet onto the other. The supply of steam, however, should be so regulated by the valvej in the pipe it that there will be only sntfi eient to accomplish the desired result without injury to the paper.

I claim as my invention- The herein-described mode of freeing pa per from electricity to prevent selrofi in printing, said mode consisting in projecting steam onto the printed sheets as they are delivered from the press, substantially as set forth.

In testimony whereof Ihave signed my name to this specification in the presence of two subscribing witnesses.

JAMES- MOKEEN ARNOLD.

\Vit n esses:

WM. F. DAVIS, HARRY SMITH,

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