US1075614A

US1075614A - Image-transmitting telegraph.

Info

Publication number: US1075614A
Application number: US56914910A
Authority: US
Inventors: Ludwig Tschoerner
Original assignee: Individual
Current assignee: Individual
Priority date: 1910-06-27
Filing date: 1910-06-27
Publication date: 1913-10-14
Anticipated expiration: 1930-10-14

Description

1 LTSGHRNER, .1 IMAGE TBANSMITTING TBLEGBAPH. APP'LIOATION FILED JUNE 27, 1910.

Patentedoct. 14, 1913.4A

' noreste;

.LUDWre rscnannnn, or vrENNAjAUsrmA-HUNGARY.

rn'aenernaivsmrrme aannemen.

To all whom t may concern: r

`B5e` it known' that I, LUDWIG TSGHRNER, of Kandligasse- 38, Vienna, VH, in the Empire of Austria-Hungary, have invented an ImageL-Transmitting Telegraph; and I do hereby declare. the following to be a full, clean", and exact description of the invention, such as'- Willl ena-ble others skilled in the art to which it apporta-ins to make and use the same.

Methods are in practice of transmitting photographs, handwriting or the like telegra'phically' by' alternately making and breaking a' circuit by means of the sender andv thereby rendering astylus or a shutter operative at the vreceiver for a varying lengtlr of time, whereby owing to the constant movement of the support at the receiver according to the duration of the action of the stylus or of the ray of light shorter or longer lines are produced on the Writing surface or upon the sensitized ilm.

Thel present invention has for its object an apparatus byl which, in employing autotypes as the originals, the; opening and closing of the circuit effected by. the autotype is'utiliaed for operating the receiver support or carrier in such al manner that the roller or drum: of.' the 'receivercomesto rest when the light shutter or stylus is operated and is actuated only afterthe contact-piece of the transmitting member passes eachsuccessive point of the autotype, whereby according to .l the duration of the actionof these parts dots or points of diierent magnitude are produced. This process not only renders it possible to? reproduce an autotype exactly `but in addition autotypes'can be produced at the receiver.

To that object an electromagnet may be arranged on the receiver, this magnet being energized by the current serving for the transmission of the picture and its armature being connected With the operating mechanism: in such a manner. that when the circuit is broken the operation is produced.

A; constructional form of such an apparatus is illustrated in the accompanying drawing by way of example, the said ap'- paratusbeingvintended for the production of autotypes, handwriting and thelike .as

' reproductions;

Figures 1 and 2 arerespectively a plan vfor operating the' shutter-the same ycurrent and' an endl elevation oi the transmitter,

Specification of Letters Patent. Application med rune 2t, 1910. serial Ne. 569,141.9.

Patented Got. 14,1913.

While Figs. 3 and 4 are respectively a plan and an end elevation of the receiver.

In the embodiment of the invention here illustrated the transmitter and the receiver comprise drums as carriers for the picture to be transmitted. 0n the drumr a of the `transmitter which is of conducting material is arranged the picture (iniv the present case an autotype gelatin copy). The drum is continuously rotated by a clockwork'd. A resilient contact pin bf travels over the picture and the circuit of the current is inten' rupted-for al shorter or longer time by the .non-conducting pointsof the picture of different magnitude and closedl for a shorter or longer time by the conducting spaces of varying' magnitude.- Now as soon as the contact pin slides over a metallic place the current proceeds from the battery' through the pin over' the drum a to the contact pin e and thence to the receiving', station. (Figs. Here the current energizes an connecte-d With a 'slide gf! of' an illuminating deviceV in -such a; manner that the armature moves the slide so that according as a negative or a positive picture is to be formed an opening. h int the casing yf is closed or opened.

opening h and enters the casing q as a pencil of rays, through a; small opening 7c in 'the casing j; onto the photographic paper or other material sensitive to light stretched on the drum l inclosed in said casing. The4 slot- 3 which extends throughout the entire length of the drum is covered on both sidesof the casing y'.- by blinds 4 hinged thereon and which upon the movement ofthe casing j are displaced to the right or tothe left and guided in guides 5 extending around the casing g.

By means of the' ine ray ot light impinging on the film, a vignette, vthat is to say a point of light gradually decreasing in lumi-l nosity toward the outside, is formed thereon as in the preparation of ruled screen photographs for purposes of photo-lithography and which,` according to the duration of the exposure of the film, when itis developed, produces a smaller or larger dot, thereby accurately reproducing the tone values of the original picture.

Simultaneously with the electro-*magnet The light from a lamp 1I passes through the energizes a second electro-magnet an, the armature of which is connected with an operating lever t. When the armature is attracted, that is to say while the circuit is closed, the operating pawl n of the spring controlled lever slides over one or more teeth of a ratchet wheel u rigidly connected with the drum, while when the current is interrupted it drives the drum to an extent corresponding to the spaces between the centers of the points of the autotype to be transmitted, this amount being adjustable by means of the set screw fu.

After each revolution of the drum of the transmitter and oit the receiver drum, tappets o on the drums release a locking lever p, thereby releasing a cam disk y in connection .with the spring casing so that the disk is able to lrotate until the rengagement of the locking lever in.J doing which it rotates the screw spindle a carrying the con-- `tact or the illuminating device by a certain amount by the intermediary of ratchet gear, whereby the contact and the illuminating device are displaced in the horizontal direction by an amount corresponding to the spaces between the centers of the points of t e autotype. The next series of points then passes beneath the contact pin; after a completerevolution of the drums the pin and the illuminating device are shifted onto the nextrow of points, and the above .procedure is repeated. lin this connection it should be noted that in order to obtain exact registra,- tion between the contact pin and the centers of the points of the autotype the bearing block carrying the drum is mounted points c at its end so that thepicture or its rows of points can be adjusted parallel with the direction of displacement of the contact pin by means of a set screw provided on the other end of the bearing block.

ln the apparatus described above therefore the transmitter controls the passage of currents of dierent duration with pauses of different length, into the line wire, these currents being transformed on the sensitized iilm of the receiver by the illuminating device into points of dierent magnitude as in an autotype.

Owing to the fact that, as already ex li .plained, the synchronous movement of the receiver drum Z with the transmitter drum is produced by the makingandbreaking of the circuit produced by the conducting and non-conducting places of the autotype it might happen that with defective places in the autotype (co y) no interruption of the current would ta elplace vin this case the receiver roller would have its movement retarded as compared with the transmitter roller so that a prejudicial. fault in the reroduction of the picture would occur. Now

1n order to prevent such defects a contactpin e slides on a disk s rigidly and electrically connected with the drum and presenting recesses or non-conducting dots'exactly corresponding with the dots of the picture.

,Consequently in any case, that is to say, even when various dots of the picture are Wanting in the autotype, the current will be interrupted at the proper moment. The non-conducting parts of the disk are, however, so small that although owing to the interruption of the current the armature of theelectromagnet m is released so that the roller is operated still the shutter is displaced so quickly that the action of the light cannot take eiiect upon the film. The defects in the autotype` might, however, consist in large part of the picture not being conductingly covered. In this case the circuit would not be closed, the result of which would likewise be that as the electro-magnet would not be energized the operation of the drum would not. take lplace. ln order to avoid these deects a second conducting pin r is'provided and slides en the rim of the edge of the disk. @n this part of the disk larger non-conducting spaces alternate with narrow conducting spaces which correspond with the spaces between the dots of the picture. Consequently if conducting spaces are likewise wanting upon the autotype notwithstanding this fact, by the intermediary of the contact pin r and of the disk s-the current will be closed for a moment which sutlices to operate the electromagnet m for the actuation of the drum. By means of this arrangementtherefore an absolute corresponding movement of the two drums a and Z-is insured. This is also the case if the forward movement of the drum Z and of the illuminating device of the receiver should be increased or decreased relatively to that of the drum a and the contact pin b on the transmitter, the only result of which would be that the picture would be reproduced to a larger or a smaller scale.

lf hand writing, pen-pictures or the like are to be transmitted telegraphically this is advantageouslyedected by arranging it as a negative gelatin copy or the like on the picture carrier a. ln this case the lines consequently form conducting places, while the rest of the surface is not conductingly covered,v Upon the rotation of the drum a when the Contact pin b slides over the non-conducting surfaces the circuit maker s, e, 1 produces the uniform closing of the circuit so that the 'synchronous movement of nthe receiver' drum with that of the transmitter drum is insured. vThe shutter is then displaced so quickly that the light does not act I is moved toward` or from the writing surface, a positive or negative copy can be obtained from a positive original or a negative or a positive copy from'a negative original.

What I claim as my invention and desire to secure by Letters Patent is:

1. In an apparatus for telegraphically transmitting and reproducing images, the combination of a transmitter and a receiver in circuit, said .transmitter alternately making and breaking the circuit, and said receiver comprising a receivingl surface, reproducing means adapted to act on said receiving surface, and means producing relative movement between' said receiving surface and reproducing means, the making and breaking of said circuit alternately actuating said reproducing means andsaid movement-producing means.

2. In an apparatus for. telegraphically transmitting and yreproducing images, the combination of a transmitter and a receiver in circuit, said transmitter alternately making. andv breaking the circuit, and said receiver comprising la receiving surface, reproducing means adapted to act on said receiving surface, and means producing relative movement between said-receiving surface and 'reproducing means, an electromagnet intermittently actuating said reproducing means and said movement-producing means with the making and breaking of the circuit by the transmitter.

3. In an' apparatus for telegraphically -transmitting and reproducing images, the

combination of a transmitter and a receiver, in circuit, said transmitter alternately makingandbreaking the circuit, and said receiver comprising a receiving surface, reproducing mcans adapted to act on said receiving surface, and means producing relative movement between said receiving surface and reproducing means, ysaid reproducing means and said movement-producing means being actuated by'the making yand breaking of the circuit, and auxiliary means making and breaking the circuit synchronously with the making andbreaking of the circuit by said transmitter and synchronously operating said movement-producing i means.

4. In ,an apparatus for telegraphically transmitting and reproducing images, the combination of atransmitter and a receiver in circuit, vsaid transmitter comprising -a prising a -receiving surface, reproducing' meansadapted to act Aon saidsurface, and` means producing relative movement between said. receiving surface and 'reproducing means,- said reproducing ,means and said movement-producing means being actuated by the making land breaking of the circuit, and auxiliary means comprising contact rings having conducting and non-conducting segments thereon corresponding to the conducting and non-conducting spaces on the transmit-ter surface, and contact-devices contacting with said rings, said contact-devices coming in contact with Vthe conducting or non-conducting segments respectively when the contact-device of the transmitter is on the non-conducting or conducting spaces of the transmitter surface, whereby the circuit is made and broken and the movement-producing means Aof the receiver is synchrov80 nously moved with the movement between said transmitter contact-device and transmitter surface.

5. In an apparatus for telegraphically transmitting and reproducing images, the combination of a transmitter and a receiver in circuit, said transmitter making and breaking the circuit, and said receiver comprising a receiving surface, reproducing means adapted'to act on said receiving surface, and means producing relative movement between said receiving surface and reproducing means, the making and breaking of said circuit actuating said reproducing means and said movement-producing means, the movements of the movement-producing means taking place after each movement of the reproducing means.'

6. In an apparatus for telegraphically transmitting and reproducing images, the 100 combination of a; transmitter and a receiver in circuit, said transmitter comprising a transmitting surface with the image thereon in conducting and non-conducting spots, and

a contact device adapted to make contact with said surface, and said receiver comprising a receiving surface, a ,reproducingl device and an electro-magnet for moving said receiving surface, said electro-magnet being intermittently energized and denergized by the making and'breaking of circuit by said contact-device of the transmitter with the conducting portions of said transmitting surface.

7 vIn an apparatus .for telegraphically 115 transmitting and reproducing images, thev combination of a transmitter and a Areceiver in circuit, said transmitter comprising a transmitting surface with the image thereon in conducting and non-conducting spots, and a contact device adapted to make contact with said surface, and said receiver comprising a receiving surface, a reproducing device andan electro-magnet for moving said receiving surface, said electro-magnet being intermittently energizedand deenergized by the making and breaking of circuit b said contact-device ofthe transmitter with the conducting portions of said transmitting surface, said electro-magnetl operai-ting to move sait receiving surface after the completion of each operation ofi'V combination of a transmitter and a receiver in circuit,- said, transmitter comprising vay v transmittingsurface with the image thereon in conducting and non-conducting spots, and ay contact device adapted to make contact with said surface, and said receiver cour prising a receiving surface, a reproducing device and an electro-magnet for moving said receiving surface, said electro-magnet being intermittently energized and denergized by the making and breaking ofl circuit by said contact-device of the transmitter with the conducting o-rtions of said transmitting surface, sai electro-magnet being put into operative condition during the operation: of said reproducing device and operating tomove said receiving surface after the completion of' each operation of said' reproducing device.

9. In an apparatus for telegraphically transmittingV and reproducing images, the combination of a transmitterl and a receiver in circuit, said transmitter comprising a transmitting surface with the image thereon in` conducting and non-conducting spots, and a contact device adapted to make 'contact with said surface, and said receiver comprising a sensitized receiving surface, a reproducing device and an electro-magnet for moving said' receivin surface, said electromagnet being: intermittently energized and denergized by the making and breaking of circuit by sa-id contact-devicel of the trans mitter with the conducting portions of said transmitting surface, said reproducing device comprising a source of light, a shutter and an inclosure having two relatively spaced openings therein through which said light projects onto saidv receiving surface whereby the light on the opening of the shutter falls as a vignetted bundle of rays through said openings, thereby producing a vignetted light spot upon said receivingsurface varying in intensity according to the duration of said illumination.

10. In an apparatus for telegraphically transmitting and reproducing images, the combination of a transmitter and areceiver in circuit, said transmitter comprising a transmitting surface with the image thereon in conducting 'and non-conducting spots, and

a Contact device adapted' to make contact withl said surface, and saidy receiver comprising a receiving" surface, a reproducing device and: an electro-magnet for moving said receivin surface, said electro-magnet. being intermittently energized and denergize'd by the making and breakingv of circuit by said'V contact-device1 of the transmitter with the conducting portions of said' trans'- mitting surface, said transmitterv having contact devices thereon adapted to complete the circuit te' saidv receiver independent ofv the contact of said. transmitter contact with the conducting spots of said' transmitting surface, and adapted to break the circuit to said receiver independent of the contact of said transmitterl contact with the non-conductingA spots of said transmitting surface,

y the making and breaking of circuit by said'rl contact-device of the transmitter with the 'conducting portions: of said transmitting surface, said-transmitter having contact rings c thereon: and' cont-acts e' and 1', one of which is adapted tocomplete the circuit to said? receiver independent of the contact of saidI transmitter'l contact with. the 4conducting spomof saidl transmittin surface, and the other of which isfadapte -to break the circuit to said receiver independent of the contactv of' said transmitter Contact",l wit-h thenon-conducting spots of said transmitting surface, vtr-hereby said receiving surface will be moved irrespective of' defects in sai transmitting surface;

In testimony whereof I have signed my name to this specification inthe presence of two subscribing witnesses. LUDWIG TSCI-IORNER.'

Witnesses:

i ALBIN' SCHILLER, AUGUST F'Ueenn. i