US2223820A - Printing telegraph apparatus - Google Patents

Description

Dec. 3, 1940. M; DRESSLER ETAL 2,223,820

PRINT ING TELEGRAPH APPARATUS Filed Sept. 1, 1937 '2 Sheets-Sheet 1 FIG 1 44 I8 INVENTOR.

MAX DRESSLER WILLY SKAWRAN A TORNEY.

3, 1940- M. DRESSLER arm. 2,223,320

PRINTING TELEGRAPH APPARATUS Filed Sept. 1, 1937 2 Sheets-Sheet 2 F IG. 3

INVENTOR. MAX DRESSLER WILLY SKAWRAN i 9 .F Sh.

Patented Dec. 3, 1940 UNITED v STATES PATENT OFFICE Shaman, Berlin-Spandau, Germany, to Siemens, &. Halske,

assignors Aktiengesellachaft,

Siemensstadt, near Berlin, Germany, a corporation oi Germany Application September 1, 1937, Serial No. 161,958 1 In Germany September 1", 1936 3' Claims.

This invention relates to printing telegraph apparatus and more particularly to telegraph apparatus wherein the individual character symbols are composed of impulses corresponding to 5 portions of the symbols.

An object of the invention is the provision of a transmitter which is simple, compact, and-reliable for the precise transmission of groups of impulses identified with and peculiar to each character symbol.

I 'A feature of the invention resides inthe arrangement of the, transmitting and receiving components in a unitary unit.

The. above and other objects of the invention are acomplished through the provision of an impulse, transmitter including a plurality of discs orcams, one individual to each character to, be transmitted, and each having its periphery formed distinctly for. each character, which are effective,l"deper 1dingv on a key lever 01 a, keyboard depressed, .on a singlecontactflto cause thereby the precise transmission ofiimpulses symbolic of the characterv for. each key lever. When used in start-stop systems, the. stopimpulse is generated by a cam operated. contact when the cam shaiton which the character. cams are also mounted isfinits rest or normal position, .When

the. foam, leaves its restposition, the contact is opened and thestartimpjillse is transmitted. A

3 pecial contact may. also be" provided wher by the:

release circuit isopened-inresponse to a start i p, l ewh n the it in mes and: receiver bothjtransrnitter mote transmitter 1 as, the, result b1- the operation of the. transmitting contact isthus avoided,

e on ma be has; rom the, low sc pti n, ke I in conjunction with the accompanying drawingsj'wherein, s srammim vt a ement. o the eivi m an mm ne a mponents of. rinting telegraph apparatus "in accordance; with the present invention;

r 2 shows diagrammatically a certain por- ":n brine transmitter; ens, t r

3 shows a further. port n or embodiment ofthe transmitter. As, symbolized in the drawings, referringpare ticularlyf to Fig, 1-, the transmitter includes a 50 plurality of key leversl 8 arranged in several rows as ise customary in transmitters for te1e-, 'graphic'communication. Eachoithe key levers i isipivoted on a rodsuch as 6, it being, of course, understood that there isya rod 6; individual to 55 each horizontal row of key levers 5. Attached to isturbanceeby 9 ration oi the re-n A full and complete understanding of. the inspect' to contacts. 12 cents.

each key lever 5 is a vertically extending bar 1 which is normally under the tension of a spring 8 and which has near its free end a notch 9.

As indicated, there is a bar 1 individual to each key lever 5 of the keyboard. Consequently, Y 5 according to an embodimentoi the invention a cam l0 mounted on a shaft H is provided individual to each of the bars'l. The periphery oi each of the cams I0 is cut difierently. In fact, i the periphery of each cam ill is cut distinctively 10 for each character, impulses corresponding to which are to be transmitted and recorded by, the

receiver connected to the, signalling channel which may be;either a wire channel or aradio channel. In other words, there is a cam i0 indi- 15 vidual to each of the characters, impulses corre spending to which are to be transmitted to a distant station.

Transmission oi impulses allocated to each of the characters isfachieved through the operation 20 pulses. correspondingrthereto will be impressed- 25 from the source of; current I! on the conductors i3 and I4. Operatively connected to contacts I} is a counterpoise l fipivoted at ilfand; haying; a: flan e t. its re eefwhi s e sms d ar ets I the otC rme in assent the-beret m: tens t e te ds aest r s mtmakex 9!?! in s. Al atta hes-s 1 that itch;

h ir 1 l eels he pe at on; at waster: poise it and consequently the: actuation ofcon: teeters,

o s i e w scisii h1- iil s It n n n a'lareoperatsdb! a ni a e u m n t mt-P0 ne; h

bwt e ke a s w th we animation Referring a ai -tench, itisnoted; that when, any one.v of th ken, vers i; is depressed,

\ universal-t bail is is alsojoperated, and; contacts e r q r me sl t eir, flect v nees r o ac I1 tw ed an ralt ele ivemountedbn siren lyr eieemgzc. which, in

its norma re e tment a -u to, hold, contacts, l2, normally closed; "when, the s a t 18 in t Intonati n; asisco m nrac- H s a ne e emvnfsvs ems I th t e tacts I: closed lunder tuch conditions current is no l BPPIied to du fltors 1 a d. l-Wh h is symbolic of; the rest condition oi the system.

Bar-'2 I is urge'dfin, cooperationwith, scam Iii by a spring 22 and has formed in its upper iree end a notchfzi. li o 'ined in the end of bar 2], oppo':

'mally is under the action of a spring 27.

site to the end wherein the notch 23 is formed is a projection 24 which is normally engaged by a bail 25 carried by a pivoted lever 26 which nor- Ball 25, being common to each of the key levers will be depressed upon the depression of any of the key levers and will thus operate against the action of spring 27 and cause movement of bar 2| sufficient to bring notch 23 in alignment with the projection formed on the free end of counterpoise i5. Under such conditions, the counterpoise IE will be shifted from the position shown in Fig. 2 to the position shown in Fig. l, wherein the contacts I2 are opened and current is removed from the line. Inasmuch as contact|8 is also opened upon the depression of a key lever 5 and the operation of bail IS, the circuit including the conductors 3 and I4 is opened and the telegraph apparatus is started into operation.

The transmitting cam shaft must be arrested after each revolution so that a symbol or a group of impulses indicative thereof is not repeatedly transmitted if the key therefor is held depressed for a period longer than the. time required for the transmitting shaft H to complete one cycle of rotation. In order to achieve such a result, a lever 28 which cooperates with cam 20 and which has secured to its lower end a pin 29 in engagement with the lower extremity of bar 2| is provided. Lever 28 is normally under the tension of a spring 30 which tends to hold pin 29 out of engagement with the lower end of bar 2|. However, upon the rotation of cam 20, lever 28 is rotated about its pivot against the action of spring 30 for moving bar 2| sufficiently to efiect the disengagement of projection 24 from ball 25. Bar 2| thereupon is restored to its'vertical normal position by the action of its spring 22. Subsequently, contacts l2 are closed by cam 20 and current is again applied to conductors I3 and I4 for the energization of the start magnet through which the transmitting shaft II is arrested.

Also secured to transmitting shaft II is a cam 32 which operates a lever-33 against the action of a spring 34. The lower end of lever 33 carries a bail 35 which extends transversely of each row of key levers and which serves to maintain the depressed key lever operated and to prevent the operation of another key lever pending the restoration of the previously depressedfkey lever 5 to its normal or undepressed condition. Such a result is achieved by forming in the upper edge of each of the key levers 5 a hook portion 36' which is designed to cooperate with bail 35 in a manner such that the depressed key lever will be maintained depressed for the cycle ofro'tation of transmitting shaft H and the other undepressed key levers will be locked against depres sion for the cycle of operation of the transmitting shaft II. I

Referring now to Fig. l, the line conductors I3 and I4 extend, depending upon whether contactblade. 38 is in contact with switch member 39 or 40, through the winding of electromagnets 4| or 42, respectively. Electromagnet 4| which constitutes the start magnet,.js normally energized due to. the fact that the contacts |2, as s own in Fig. 2, are normally closed. Consequently,

stop member 43 secured to the armature of electromag'net 4|, normally lies in the path of stop lug 44"s'ecured to transmitting shaftll. Under such conditions, when a key lever is depressed,

aaeaeae contacts i2 will be opened. Current is thereupon removed from the line conductors i3 and E i and electromagnet 4| will be deenergized. Upon deenergization, the armatureof electromagnet M moves stop projection 43 out of the path of stop lug 4 and releases transmitting shaft H, which normallytends to rotate by power communicated from a motor through a friction clutch which is released for rotation. V

Electromagnet 42 constitutes the receiving or printing magnet of the receiver and responds to the operation of contacts I2 in accordance with the rotation of cam I8 rendered effective on bar I through the operation of a particular key lever 5. Electromagnet 42 controls a pressure blade or hammer 45 which cooperates with a rotating spiral 46 to record the character symbols, as is fully disclosed in Patent No. 2,046,328 to E. E. K einschmidt et al., granted July 7, 1936. Spiral drum 46 is secured to shaft 41 which also carries a gear 48 meshed with a gear 49 secured to shaft 50 of the receiving component of the combined 39 to include the winding of electromagnet 4| in the conductors I3 and I4. However, during rotation of cam 5|, switch member is moved into contact with switch blade 38, so that the winding of electromagnet 42 is included in the conductors l3 and I4 and the winding of electromagnet 4| is excluded therefrom.

Under certain conditions it may be found desirable to utilize positive and negative current conditions which are used in wireless transmis sion. To make possible the use of apparatus con-1 stituting a part of the present invention for such purpose, an additional contact 52, shown in dotted outline in- Figs. 1 and 2, may be provided. With the arrangement of the contacts as indicated,

" transmission may'be accomplished through the use of-polar signals.

, apparatus for it may be embodied in avariety of different forms of apparatus without departing from the spirit and scope of the invention.

What is claimed is: 1. A telegraph transmitter including a plurality of key levers, a plurality of members one for each character, impulses indicative of which are to be transmitted, means operated by said key levers for rendering said members individually effective, and means common to all of said members and operated by each member through said means for transmitting impulses in accordance with the operated member and distinctive of the character identified therewith.

2. A telegraph transmitter including a plurality of key levers, an operating shaft, a plurality of cams on said shaft each having its periphery formed .with projections corresponding to the individual impulses characteristic of the character allocated thereto, means operated by said key levers for rendering said cams individually effective, and means common to all of said cams and operated by each cam through said means for transmitting the impulses determined by the projections on the periphery ofthe then effective cam.

3. A telegraph transmitter including a plurality of key levers, an operating shaft, a plurality of cams secured to said shaft each of said cams having its periphery formed with projections corresponding to the individual impulses representative of the character to which said cam is allotive of different characters, a universal ball, a

start cam also secured to said shaft, a transmitting contact, andmeans operated by. said ball through the operation of a key lever for rendering said start cam effective to eifect through the operation of said contact the transmission of a start signal and thereafter one of said plurality of cams for the transmission of the character identifying impulses.

5. A telegraph transmitter including a plurality of key levers, an operating shaft, a plurality of character cams secured to said shaft each of said cams having its periphery formed with projections corresponding to the impulses individual to each character, a start cam also secured to said shaft, a transmitting contact, means common to the cams identified with the character and the start impulses, and means operated by said key levers for rendering said start cam and said character cams effective through said common means on said contact successively to effeet the transmission of a start impulse followed by a series of character impulses.

6. A telegraph transmitter including a plurality of key levers, an operating shaft, a plurality of members carried by said shaft each of said members being identified with a particular character and arranged to control the transmission of impulses identified with the character allocated thereto, means for causing the transmission of a start impulse, means controlled by each of said key levers for rendering the member individual thereto effective for the transmission of impulses for the character thereof, and means operated in timed relatlonwith respect to said members for insuring that a stop impulse will be transmitted at the end of transmission of the character impulses regardless of the continued operation of the key lever through the operation of which the start impulse was transmitted.

'7. A telegraph transmitter including a plurality of key levers, a plurality of members, one

for each character, impulses indicative of which are'to be transmitted, a single transmitting contact, means operated by saidkey levers for rendering said members individually effective on said contact, an additional set of contacts con-v nected in circuit with said transmitting contact, a

and means operated upon the depression of any of said key levers for operating said additional contacts.

8. A telegraph system including a receiver comprising starting and printing mechanisms-and a transmitter including a plurality of members one for each character, impulses indicative of which are to be transmitted, a plurality of key levers, means operated by said key levers for rendering said members individually effective,

means common to said members and operated by each member for transmitting impulses in accordance with the operated member, means 01)- erative upon the depression of a key lever for transmitting a start impulse, and means effective in response to a start impulse for rendering said starting mechanism ineffective and said printing mechanism effective.

- MAX DRESSLER.

WILLY SKAWRAN.

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