US1290957A - System for the transmission of writing and the like in facsimile. - Google Patents

Description

H. F088 6: H. PETERSEN. SYSTEM FOR THE TRANSMISSION OF WRITING AND THE LIKE IN FACSIMILE. APPLICATION FILED MAY 8. 1911.

1,290,957. Patented Jan. 14,1919.

UNITED STATES PATENT OFFICE.

HERMAN FOSS, OF TJ'6M6, AND HERMOD PETERSEN, OF CHRISTIANIA, NORWAY- SYSTEM FOR THE TRANSMISSION OF WRITING AND THE LIKE IN FACSIMILE.

Specification of Letters Patent. I Patented an. 14, 1919,

Application filed May 8, 1917. Serial No. 187,353.

To all whom it may concern:

Be it known that we, HERMAN Foss and HERMOD PETERSEN, both subjects of the King of Norway, and residing at Tjomo, Norway, and Christiania, Norway, respectively, have invented certain new and useful Improvements in'Systems for the Transmission of Writing and the like in Facsimile; and they do hereby declare the following to be a full, clear; and exact description of the invention, such as will enable others skilled,

. transmission of writing in facsimile, in which the writing is effected at the recelvmg station by means of electric sparks perforating paper or the like consists in the production of sufficiently strong impulses of electric current to effect the necessary sparks when transmission is to take place over long distances.

According to the present invention this difficulty is overcome by always having the source of current feeding the transmission wires connectedto the latter and to the re-- ceiving apparatus, while the sending apparatus is so constructed that it short-circuits part of the energy transmitted from the source of current except at the moments when an impulse of current is to be transmitted. l

The energy delivered by the source of current at the same time is so adjusted that when part of the same is short-circuited at the sending station it is just insuflicient to produce sparks at the receiving station, while as soon the short-circuit is cut off for one moment so that it may work at full tension, it is sufficiently strong to produce the necessary sparks. I

The short-circuiting of the necessary branch of the transmission wires at the sending station may be carried out in a known manner by means of a contact pin passing over a cylinder 01" the like provided with .writing or illustrations ininsulating ink, so

that the short-circuit is cut off each time the pin passes part of the writing.

It has been found advisable to place a source of current, preferably a high fre- I quency generator producing the current impulses for the receiving station, at the said station, the short-circuiting of the current taking place through the transmission wires. Although only a comparatively small part of'the total energy of the source of current' is taken up by the short-circuit, the apparatus of the receiving station may always be so adjusted, that the current impulses, when the short-circuit is cut in, are just too weak to roduce sparks, while the necessary spar s are produced at once as soon as the short circuit at the sending station is cut oil.

On the drawing a form of the invention is illustrated diagrammatically.

1 is a rotating metal cylinder at the sending station and 2 is the-contact pin resting on the same, said contact pin being pivoted at 3. The cylinder 1 and contact pin 2 are connected by means of transmission wires 4. to the brushes 5, 6 of a high-frequency enerator 7 i at the receiving station. aid

brushes 5, 6 are also connected to roller 8 80.

and sparking pin 9 of the receiving station, roller 8 rotating synchronous with roller 1.

Pin 9 is maintained a short distance from roller 8 .so that sparks pass between the same when exposed to the full current of the generator. When however the contact between 2 and 1 is established part of the generator current goes through the trans mission wire 4, and the current is not strong enough to produce sparks at 9. When roller 1 is provided with insulating writing or the like, the current will be interrupted each time pin 2 passes over part of the writing and at these moments the current from generator 7 will be sufficiently strong to produce. 'sparks' at 9 perforating a paper placed on cylinder 8. The manner in which synchromsm is maintamed between rollers 1 and 8 does not form part of our invention. It

may be accomplished in any Well known 10!,

manner, for example, by like clock mechanisms at the respective stations.

We claim: p 1. In a system for the transmission of facsimile signals, a high frequency generator 1 5 at therreceiving station and short-circuited at thesending station, a sparking-device at the receiving station for perforating a sheet of paper when an impulse is received from the sending station, said sparking .device receiving its current from the high frequency generator, means at the sending Sta tion to interrupt short-circuiting of the said generator when an impulse is to be transmitted, the energy of the generator being just sufficient to produce sparks at the receiving station at the moments when the short-circuiting at the sending station is interrupted.

2. In a system for the transmission of facsimile signals, a high frequency generator at the receiving station and short-circuited at the sending station, a sparking device at the receiving station for perforating a sheet of paper when an impulse is received from the sending station, said sparking-device receiving its current from the high frequency generator, means at the sending station comprising a rotating roller' of conductive material covered by writing in insulating ink and a contact pin resting on the said roller for interrupting the short.- circuiting each time the contact pin passes over part of the writing.

3. In a system for the transmission of facsimile signals, a sending station comprising means actuated by the writing for 1n- ,terrupting an electric current, a receiving perforating paper by means of electric sparks at the receiving station said sparking device being connected to the source of cure rent and being so adjusted that it will produce sparks only at the moments when the current at the sending station is interrupted thereby strengthening the tension of the current at the receiving station.

In testimony that we claim the foregoing as our invention, We have signed our names in presence of two subscribing witnesses.

HERMAN FOSS. HERMOD PETERSEN.

Witnesses: I

C. FABRIGIUS HANSEN, O. NORMAN.

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