US1824341A - Means for indelibly writing upon paper and other fabrics - Google Patents

Description

Sept. 22, 1931. w. L. GILL 1,824,341

MEANS FOR INDELIBLY.WRITING UPON PAPER AND OTHER FABRICS Filed June 25, 1928 2 Sheets-Sheet 1 INVENTOR. WAATER L. G/LL,

ATTORNEYJ I p 22, 1931. w. L. GILL 1,824,341

usm FOR'INDILIBLYMRITING upon mzn AND opium mamas Filed June 25. 1928 2 Sheets-51w 2 INVENTOR. WALTER L. GILL,

A TORNEYS Patented Sept. 22, 1931 UNITED STATES PATENT OFFIC WALTER L. GILL, OF BEDLANDS, CALII'OBNIA Application flied June 25,

This invention relates to a method of and means for indelibly writing upon paper and other fabrics. The primary purpose of the invention is to prevent forgery, though, as

this description proceeds, it will be seen that the principles involved are useful in formin designs upon various kinds of flex ble faiirics, such as paper, cloth, and the like, adapted to be completely penetrated by a high tension current.

The invention further contemplates the employment of a stylus of such solidity that, while it cannot flow into and blot the paper, yet it may be disrupted by the action of the electric current and part of its substance be actually driven into the paper about the perforations formed by the action of the electric current. A

A further object of the invention is to pro- 0 vide a structure of the character indicated, in which the connections are so arranged that the operator will be protected from accidental shock from the high tension current.

Further objects and advantages of the invention will be set forth in detail in the description which follows.

In the accompanying drawings:

Fig. 1 is a diagrammatic view of a preferred form of apparatus adapted to carry out the purposes of the invention,

Fig. 2 is a perspective view, looking from one side of the apparatus,

Fig. 3 is a perspective view, looking from the opposite side of the apparatus, and

Fig. 4 is a detail sectional view of the stylus, hereinafter described.

Like numerals designate corresponding parts throughout the several figures of the drawings.

g In reference to Fig. 1, the circuit enters the machine through the attachment lug F, from any commercial or city circuit, t rough the contacts E and E of the convenience out let body E, then from the connection E to G 45 of the switch G, through the switch G to the contact G, to the transformer C at terminal C, through the. primary winding of the transformer C and out through the terminal C and from there to the contact E at the convenience outlet body E. From the sec- 1928. Serial Io. M338.

ondary of the transformer C through the terminal C to the binding post B on an induction or spark coil B, then through the primary winding of the induction coil to the make and break contact at B, then through the vibrator blade to the binding post B, to the terminal C. i

The secondary circuit of the induction coil ties to the binding post B, from B to the terminal H of the jack H. The circuit branches at H and one line goes to the terminal 1) of the choke coil D, then through the coil to the terminal D, then to the condenser J at the terminal J then from the terminal J of the condenser to the binding post B of the induction coil B, then a special wire S runs from the binding post B of the secondary to binding B of the primar of the induction coil B. The purpose of t is special connection is to keep the high volta e of the induc- 7 i tion coil off the metal plate K, which forms part of the top of the casing A in which the spark coil and associated parts are housed, in Fig. 2. A wire-P runs from the binding post B to the plate K, Fig. 2. Then the circuit is from the jack I through the flexible wire of the pencil M, in Fig. 2, through the filler of the pencil, then through the Writing material between the pencil M and the metallic plate Fig. 2, then from plate K back to the binding post B, thus completing the secondary circuit on the induction coil B.

A piece of insulating material of the shape shown by the dotted line L, in Fig. 2, is placed on the metal plate K for the purpose of making a rest for the writers hand and for the purpose of holding the check or other writing material firmly on plate K. The insulating material is pivoted at the pin N, in Fig. 2. The metal plate K, which is a conductor, forms an integral part of the container A.

As is best illustrated in Fig. 4, the pencil comprises a body portion M, which is made of insulating material, such as hard rubber, for example. and carries a renewable core, or point, of conductive material, similar to the fillin of lead pencils, for example, and which maybe made of varying colors, and it is to this core that the flexible wire M oil, or stylus M, is connected.

of the n pe 2 of the pencil to the metallic plate.

The use of a dry stylus of material of this character permits the actual burning or minute exploding of the particles of paper around the minute perforations caused by the action of the high tension current as it passes from the point of said conductive core It further permits the actual disruption of a part of this relatively hard core which is exploded or impacted forcibl into the paper, or like material being act upon, around the edges of such perforations, to such an extent as to render it impossible for anyone to remove the same.

It is clear that a core of this character will not spread or blot the paper, after the manner of a liquid. Consequently, I am able to maintain clear cut and distant lines while, at the same time, actually perforating the paper and impregnating the same with a substance which cannot be removed. This clean line effect is further enhanced by the use of a plate which is conductive at all points in its area. That is to say, there are no dead spots in the plate, and, consequently, whenever the vibrator of the spark coil is in a position to cause a discharge from the secondary, the paper will be punctured, no matter at what position the stylus may be at that particular moment with respect to the plate.

Forgeries are mostly accomplished in two ways, viz The signature to be forged is placed over a glass under which a strong light is placed, then paper is laid above and the signature is traced. The above method cannot be used with the device of this invention, as there must be a metallic sheet under the paper which is being written upon, and said metallic sheet would shut out the light.

The second method is to copy the signature by drawing it, which requires a slow exact movement of the pencilf A signaturewritten at normal speed would have a certain number of holes per inch, while a drawn copy :of that signature would have a greatly increased amount of burning due to spark continuing to flow through the holes for a greater length of time, caused by the slower movement of the pencil. Assume that a certain man writes all his checks with the device of this application, and that his signature card at the bank is written by the same method. If his signature is forged by the drawing, or slow method, the difference in the burning and size of the holes would be at once noticeable. This apparatus gives protection automatically. for the reason that the time element necessary for the voltage to build up high enough to puncture the paper governs the number of holes punctured per inch, as

well as the degree of burning in paper of payee; raising the amount of the check, either in the figures or the written amount; and change of date of a check. It also protects the makers signature, or any other legible mark, because of the fact that the electric arc of the pencil, in passing through the paper, burns a perforation or punctures the paper, making an irregular hole, burning the edges of the hole, and fusing into the paper about such edges, the color from the pencil filler.

The action of the electric are which ap proaches an explosivea'c'tion, due to the fact that passage of the current takes place intermittently and only when the current has been built up by the coil, raises small irregular particles at the edges of the perforations. These cannot be plugged with regular shaped pieces of paper, they cannot be erased because they are burned through, and paper pulp cannot be filled in because it will not unite with the burned edges, and the color from the disrupted core would show through such filler.

It is to be understood that the invention is points in its area, a spark coil in the casing,

means for supplying current to the primary of the spark coil, a connection between the secondary of the spark coil and said plate, a stylus having a conductive core adapted to be manually traversed over a paper disposed upon said plate included in the secondary circuit of said coil, and a special connection between the secondary and primary circuits of the spark coil, by which the high potential from said secondary is prevented from being imposed upon said plate without grounding of said plate.

2. In a device of the character described, comprising a rectangular casing, the to) of which is shaped to form a writing surface, a plate constituting a part of said' top, said plate being conductive over su stantially all of its area, a stylus, means within the casing for supplying high potential to said stylus in such manner that when the stylus is passed over a piece of paper placed upon said plate, said paper will be perforated by the action of high potential, and a rest made of a piece of insulating material of substantial L-shape, the extremity of the long leg of which is pivoted to the top of the casing, with said long leg disposed in substantial parallelism with the top of said plate.

In testin'iony whereof I aflix my signature.

WALTER L. GILL.

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