USRE5519E - Improvement in printing-telegraphs - Google Patents

Description

4-Sheets--Shootl.

T. A. EDiSUN. Printing Telagraphs.

Reis s ud August 5, 18 a,

fiSheetv-Sheet 2 T. A. EDISON.

Printing Telag-raphs.

"0.5;519. Reissued August5,1873

UNITED STATES PATENT OFFICE,

THOMAS EDISON, OF NEWARK, NEW annssmnssienon, BY'MESNE AS- SIGNMENTS, TO THE com) AND STOCK-TELEGRAPH COMPANY, OF NEW YORK orrY IMPROVEMENT m P'RlNTiNG TEL'EG-RAPHS.

Specification forming part of Letters Patent No. 91,527, dated June 22, 1869; reissueNo. 4,166, dated October 25,1870; reissue No. 5,519, dated August 5, 1873; application filed June 19, 1873.

To all whom it may concern.-

Be it known that I, THOMAS A. EDISON, now of Newark, in the county of. Essex and State an Improveof New Jersey, have invented ment "in Frinting-Telegraphs, of which the following is a specification.

In this printing-telegraph instrument the type-wheel is set by. a step-bystep movement derived from an electro-magnet, and the impression is given by another magnet,.-and these magnets are line and with ashuntin such a manner that the type-wheel magnet will be short-circuited when the printing is effected, thereby giving increased energy to the printing-magnet without enlarging the batterypower. Several instruments are placed in the same circuit, and only one wire is required for operating the same, and the record is made at the receivingstation or stations without an operator being required at the receiving instrument. By reversing the polarity of the currenta polarized switch is operaed, and this becomes a circuit- .changer to direct the pulsations from the re ceiving-station.

In the drawings, Figure l is a general perspective view. Fig. 2 represents the typewheel magnet and mechanism for revolving the type-wheel. Fig. 3 shows the printinglever, and Figs. 4 and 5 are diagrams illustrative of the circuit connec -ions. p

A represents the frame of the apparatus, to

which is attached an electromagnet, B B, of the usual construction. 4 whose periphery is provided with suitable let- 0 is a type-wheel,

ters or other characterswhich revolves upon a stud or shaft, k. The armature?) ofthe electro-inagnct B is attached to a lever, c, suspended upon an arbor, d. The lower end of the lever c is bifurcated, as seen in Figs. 1 and 2,'the two arms e fcarryiug pawls g h, which engage at opposite points upon the periphery of the ratchet-wheel 2', which is fixed upon the same shaft as the type-wheel O, and revolves with it.

It will be understood, by reference to Fig. 2,

that each vibration of the lever c backward or forward will causethe ratchet-wheel i to connected with the main advance in its revolution the distance of one tooth in the same direction.

The type-wheel 0 receives its supply of ink from the roller D in any well-known manner.

The elcctro-magnet E is similar to the elec-- tro-inagnet B, and is attached to the frame A. The armature H is attached to the lever G, and swings upon its axis at j. At its opposite extremity'is a roller, 2', which-occupiesa position immediately beneath the type l wheel 0.; r g

The strip of paper upon which the cornmu nications are to be printed is led froina suitable reel, not shown, over the rollers", which it. is held with a suflicient degree of friction by a spring arm, I, provided withau j, open slot, m, so that when the roller 13 is raised by the action of theelectronnagnct E upon the lever G the strip of paper is brought in contact with whatever letter or character may at that time beopposite upon the type-wheel 0, thereby printing the impression of said let.-

ter or character upon the paper. .When the action of the electro-magnet E ceases the lever Gis drawn back to its original position by a spring,6..

After each impression has been made the strip of paper is moved forward by means of I a pawl, n, which, when the lever G is drawn back, engages with the teeth of a'ratchet- Wheel, 0, Fig. 3, which is secured to the roller i, causing the said roller to revolveand draw the paper forward a sufficient distance to produce the required space between the letters,

The edges 7 of-thc roller '11 areroughcned to prevent the paper. from slipping during the movement. I

The electro-inagnet L is 1n the main circuit,

and the eiectronnagnetsB and -E are also in' the main circuit, and the circuit-changer or switch a is operated by this magnet L,and the shunt-connections that act. to direct or short-circuit the current are illustratedih Figs. 4 and 5.

The batteries I and K are of any usual character. A switch, 1', is shown for connecting one battery or the other, and therebyreversing the circuit, as illustra e by the arrows in lay, being well known,

Figs. i and 5, f h representing the ground- 'es or earth-connections, s the line to the distant instrument, and e theline to the next instrument or to the earth.

that pulsations sent from the battery to the distant station by a. finger-key or any competent circuit-breaker travel over the line-wires 8, through the magnet L, wire .a:, and magnet B, to set the type-wheel; thence, by d u o e and earth-connection, to f, p, and q to 9'.

When the type-wheel is set tracts the switch u, and the printing-magnet is energized by a shunting operation, as seen in Fig. 5; ihe current passes through c, i, E, c, d, u, w, c, 0:, L, and 5; thereby the switch or circuit-changer it connects the circuits, so that the type-wheel magnet B is shunted or shortcircnited, for, although the magnet B still re mains in the metallic circuit, the electric current will principally pass over the route-of least resistance from -c to' d, a, a, and m, in-

' stead of going from 0' through B to m.

The shunt circuit-changer or a polarized reto the same.

Undcrall circumstances the electro-magnet L is the means for operating the circuitchanger or-shuntswitch mend when this is made as a polarized bar it will be changed from w to c according to the polarity of the current. i avail, therefore, of this means for moving the circuit-changer u, and employ put cations of one polarity to set and then a current of reverse polarity to effect the'printing. y

it will be evident that when the'change of polarityis made use of the arrangement of the circuits show his Fig. 4 causes theshunt-switch to short-circuit the printing-magnet E while the type wheel is being set by pulsations actthe maguetE remaining but the principal pering in the magnet B, in the metallic circuit; tic-n oi the current, taking the route of least resistan -c by'd, u, '0, and 0, instead of going from/cl by c, E, and i to e; and when the change of polarity in the current is employed to cfihct the inoveni'ent in the shunt-switch u the type-wheel magnet 13 is short-circuited or shunted as before.

The switch a is so made that itwill move more rapidly than either of the armatures of the magnets E B. Hence one or the other of the magnets will be shunted by themovement oi theswitch, and there will not be any 'false movement of either armature.

the pole N atv may be of any desired character, and my iuventiou does not relate the type-wheel,

The above-described invention ierlcsrgned particularly for transmittin int .u 'ence from a central station to a numbc" of receiving-stations included. in the circuit, in which case HQ By referring to Fig. 4 it will be understood batteries or operators will be reouired'at the receiving-stations; but if messages are to be sent from each station as well as received, them each instrument will require to be pro-- vided with a transmitting instrument, a battery, and an ordinary switch connected with a groundwire. What is claimed as the invention of said '1. A. EnisoN isr 1. A printingtelegraph instrument with the printing and type-wheel magnets in the metallic circuit forming part of the main line, and a shunt-switch operated by electromagnetism to divert the currcnt'froui the type-wheel magnet while the printing is effected, substantial- ,ly as set forth.

2. A separate magnet in the main line to cut out, by a switch and shunt connection, either the printing'or the type-wheel magnets, substantially as set forth.

.3. Inaprinting-telegraph instrument, three 1 elcetro-nxaguets within the metallic circuit. and a shuntforming part of the, main line, switch operated by magnetisrmwhereby the current is diverted or short-circuitedfrom one magnet by the movement of the switch, substantiaily as set forth.

4. Two or more printing-telegraph instruments placed in one main circuit, and operated simultaneously by pulsations of electricity,the

type-wheel being set by pulsations of one polarity, and the printing being effected by puisations of the opposite polarity, substantially as set forth.

6. Two or more printingtelegraph instruments placed in one main circuit, withall the electro-magnets in metallic connection with that circuit, so that the entireci'rcnits remain unbroken, in combination with shunts andswitches actuated by magnetism 'to'direct the current principally through the printing-magnets when the impression is to bc'made, substantially as set forth.

MARSHALL LEFFERTS, President the Gold and Stock Telegraph 00;

NORMAN GplllLLER,

Secretary.

Witnesses:

Gno. T. PINCKNEY, CHAS. H. SMITH.

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