US577300A - Printing-press - Google Patents

Description

(No Model.)l

G. G. HARRS.

PRINTING PRESS.

No. 577,300. A' Patented Feb. 16,1897.

`Tru; mums crois 07, mofauwa. WASHINGTON. n. n;

UNrTnn STATES PATENT OFFICE.

CHARLES G. HARRIS, OF NILES, OHIO.

PRINTING-PRESS.

SPECIFICATION forming part of Letters atent No. 577,300, dated February 1G, 1897.

Application filed March 18,1895. Serial No. 542,229. (No model.)

.To all whowb t may concern.-

Be it known that I, CHARLES G. HARRIS, of Niles, in the county of Trumbull and State of Ohio, have invented certain new and useful Improvements in Printing-Presses; 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 same.

This invention contemplates certain new and useful improvements in pri ntin g-presses.

In the art of printing great difficulty is eX- perienced, especially in rapidly operated presses, by reason of the printed sheets of paper becoming charged with electricity, that is, the frictional electricity generated by the rapidly-moving press becomes stored in the paper and causes the same to curl and in some instances coil back upon the press wheels and cylinders, thus greatly interfering with the operation of the press and resulting in considerable loss.

The object of the present invention is to proi vide simple and highly-efficient mea-ns to aid the discharge from a press and to effectually remove from the paper all traces of electricity. This I accomplish by providing an independent roll located transversely across the line of discharge from the press, said roll having an outer surface of absorbent dampened mate rial. This roll is preferably belted to one of the wheels of the press, and has a face speed greater than that of the paper. By means of this rapid revolution the fibers of the roll will slightly contact with the paper and the centrifugal action tends to maintain the dampness or moisture of the roll at the surface thereof, keeping it uniformly moistened at every point.

The invention will be hereinafter full)7 set forth, and particularly pointed out in the claim.

In the accompanying drawing, the figure is a View in perspective of a portion of a printingpress, showingthe application of my invention.

Referring tothe drawing, A designates the frame of a press; a, the plate or type-carry ing cylinder; a', the impression-cylinder; and c2, two endless tapes, which pass over the top of cylinder a', as ordinarily employed forholding the paper while being printed. The rear wheels or rollers, around which these tapes are passed, are shown at l), and they are adjustably secured on a shaft b', supported by arms b2. I have also shown two small rollers b3, mounted on a shaft b4, around which are passed two lower tapes b5, preferably metallic, said latter tapes encircling cylinder a and traveling in conjunction with the tapes a2. The paper while being printed is carried between these two sets of tapes and is discharged as it passes from between said tapes and Wheels b and rollers b3 onto the receiving table b. In close juxtaposition to this point of discharge I locate a roll C, mounted at its ends in arms CZ. The body of this roll may be composed of felt, cloth7 soft paper, or other absorbent material capable of being maintained in a moistened state and which is pervious to water. Upon one end of this roller is a small pulley d', around which is passed a reversed belt d2, which also engages a wheel d, mounted on shaft d. The power imparted from this latter shaft gives the roll C a motion outward or in the line of discharge, but faster than that of the printed sheet,'the discharge of which is thus accelerated. The contact of the printed sheet with the fibers of the moistened surface serves to effectively conduct away the electricity with which said sheet may be charged and remove therefrom all traces of such electricity. The location of the dampening medium is such that all tendency of the printed sheet to coil and travel with the tapes is immediately overcome and the sheet falls directly onto the receiving-table. The roll being rapidly revolved, the centrifugal force will serve to maintain the moisture at the surface thereof and thus keep it uniformly dampened throughout its length.

It is obvious that my invention is applicable to different forms of printingpresses from that described, as its usefulness is not dependent upon any particular form of mechanism, the essential feature being to locate the dam pened roll in close juxtaposition to the point of discharge, so that all static electricity will be extracted from the papers at or prior to their discharge from the press.

IOO

The advantages of my invention are appar ent to these skilled in the art and eau be .readily understood from what has been said.

I elaiin as my invention- In a printing-press, an independent roll lo eated in juxtaposition to the diseharge meehanism of the press, and transversely aeross the line oi passage of the paper, or the like, said roll having` its surface composed of ah- Io sorbent material, and means forrotating said roll at a surface speed equal te o1.' greater than the speed of the paper or the lile,wliie'l1. latter is acted upon by said roll, as set forth.

In testimony whereof I have signed this specification in the presence Oi two subscribing Witnesses.

CHARLES G. HAI-NHS. Nitin esses:

W. II. SMiLnY, GEO. XV. UPTON.

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