US487229A - eaton - Google Patents

Description

14 Sheets-Sheet --1.

A. 1). NEAL & H. F. EATON. PRINTING. TELEGRAPH.

No.48'7,229. Patented Nov. 29, 1892.

(No Model.)

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No.487,229. Patented Ndv. 29,1892.

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(No Model.) 14 Sheets-Sheet 3.

A. D. NEAL & H. F. EATON.

PRINTING TELEGRAPH.

No. 487,229. Patented Nov. 29, 1892.

CZZZer Model.) 14 Sheets-Sheet 4; A. D.'NEAL 80 H. F. EATON.

PRINTING TELEGRAPH.

u Patented Nov. 29, 1892.

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(No Model.) r 14 Sheets-Sheet 5.

A. 1). NEAL & H. P. EATON. PRINTING TELEGRAPH No. 487,229. Patented Nov. 29, 1892.

(No Model.) 14 Sheets-Sheet 6. A. D. NEAL & H. P. EATON. PRINTING TELEGRAPH.

N0. 487 Z 9. P tented NOV. 291392.

. i2 FE ark v ibwwrdjfl' (No Model.) 14 Sheets-Sheet 7.

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PRINTING TELEGRAPH.

Patented Nov. 29, 1892.

(No Model.) 14 Sheets-Sheet 8.

A. D. NEAL 8: E. F. EATON. PRINTING TELEGRAPH. No. 487,229. Patent edNgv. 29, 1892; *1 1, L, ,;L R W H Q M Q. if war-QB 0.7M W 7 Atzya.

(No Model.) 14 Sheets-Sheet 9.

A. 1). NEAL-8v H. P. EATON.

PRINTINGTELEGRAPH.

Patented Nov. 29, 1892.

(lio ModeL) 1-4 Sheets-Sheet 10. A. D. NEAL & 'H. P. EATON.

PRINTING TELEGRAPH.

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I We V No Model.) 14 Sheets Sheet 11.

A. D. NEAL & H. F. EATON.

PRINTING TELEGRAPH.

No 487,229. Patented Nov. 29. 1892.

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{No Model.) 14 sheet -sheet 13.

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No. 487,229 Patented Nov. 29, 1892 -(No maael y' 14 Sheets-Sheet 14.

A. D. NEAL & H. P. BATON.

PRINTING TELEGRAPH.

No. 487,229. Patented Nov. 29, 1892.

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r NORRIS Pzrzns cu, moron? r a rmen TATES aren't t rrent ALBERT D. NEAL, OF BOSTON, AND HOWARD F. EATON, OF QUINCY MASSACHUSETTS; SAID EATON ASSIGNOR TO SAID NEAL.

PRINTING-TELEGRAPH.

SPECIFICATION forming part of Letters Patent No. 487,229, dated November 29, 1892. Application filed A ril 21, 1891. Renewed October 10, 1892. Serial No. 448,301. (No model.)

To aZZ whom it may concern.-

Be it known that we, ALBERT D. NEAL, of Boston, county of Suffolk, and HOWARD F. EATON, of Quincy, county of Norfolk, State of Massachusetts, have invented an Improvement in Printing-Telegraphs, of which the following description, in connection with the accompanying drawings, is a specification, like letters and figures on the drawings representing like parts.

The type-writer for intercommnnication to be herein described contains as an element thereof a type-writer, the type-writer being capable, by means which will be hereinafter described, for use not only as an ordinary office type-writer, but also as a transmittinginstrument to operate one or more like typewriters at a distance, or to be putinto acondition of receptivity as a receiver of a message from a distant station. "Each type or character used in printing is under the control of a magnet of local circuit, which magnet is excited at the proper time, and by or through suitable mechanisms, acting, preferably, through a key-lever, effects the putting into position of the desired character to be printed.

In our experiments we have ascertained that atype-writing machine of the Hammond variety-such as represented in-United States Patent No. 290,419-is best adapted for the work above outlined, and therefore we have in the embodiment of our invention herein contained shown our improvements as incorporated with the so-called Hammond typewriter; but it will be obvious to thoseskilled in the art that some parts of our invention with but slight mechanical changes and adaptations may be readily applied to other similar or suitable forms of type-writers, so that our invention is not to be construed in every I instance so narrowly as to exclude therefrom other type-writers than those of the Hammond form; but the Hammond machine has some great advantages over others, among which is the fact that all the characters to be printed are mounted upon a plate or character-carrier, which is moved by the depression of a key-lever to place the character corresponding to the key-leverdepressed opposite or in line with the hammer, a single hammer being used on the machine.

The Hammond machine contains two like type or character carriers.

Our apparatus has been devised in such manner that for short distances, Where great accuracy is required and speed desired, there is a separate wire for each character, the said wires being collected in a cable.

To bring into effect the cable, we have provided a series of cable-keys and circuit-controllers arranged in aseparate partof the machine and each key being put under theconirol of one of the usual type or key levers of the type-writing machine, the said type or key levers being utilized by the operator when sending a message; but if a machine is to receive a message the cable-keys co-operating with itare thrown out of operative position, so as not to interfere with the movements of the usual type or key levers by the magnets of the receiving-machine, actuated, however, from a distant station. The key-levers are marked to designate the particular type-characters which they will, when actuated, cause to be displayed in a printed line, and hence said levers constitute what may be called character-levers.

Each apparatus or instignment, as we shall sometimes designate the type-writer, with the adjuncts added by us, has as a cooperating part of it a continuously-rotating selecting-drum and a circuit-selecting arm rotating in unison therewith, and when but one wire is to be used between stations thesending-operator when he arrests the rotation of the said drum will arrest the rotation of the circuit-selecting arm at the receiving-station, so that. said arm Will close a local circuit at the receiving-station and effect the putting into position at the printing-point of the receiving-machine the character to be printed, said character corresponding with the character predetermined at the sending-station.

While the message is being sent from the 9 sending-station, the circuit-selecting arm at the said station will rotate, but it will not operate the local magnets at the sending-sta tion, for at such time a suitable switch, to be described, will be moved to open the operating-circuit in which said local magnets are contained.

Our improved apparatus may be readily changed from the cable system to the one-Wire system, and vice versa, as desired, the same machines being utilized in both cases.

\Ve have combined with the carriage holding the paper being printed upon means whereby the said carriage may be returned automatically to its starting-point, said mechanism being started my means of a circuitcontrolling key forming part of a normallyopen circuit. The means for producing this return movement of the carriage may either be an electromotor or an electromechanical motor having a sprin During this return movement of the carriage and before the carriage completes the end of its return stroke the current of the motor is checked or cut off, so that the carriage comes to rest without any injurious jar.

We have devised a combination-switch and placed it in circuit with the type-writers, the said switch having what we denominate general and special contacts, the general contacts being used for general or public Work and the special contacts being employed by special subscribers for secrecy between themselves. Vhen the combination-switches of the instruments are set with the general contacts closed, all the machines in receptive position, and having the circuits closed, the general contacts will receive the general messages as sent; but when any two or more subscribers desire secrecy upon notice each will set his instruments with the combination-switches on special contacts common to only the said particular subscribers and the sending-operator will manipulate his keys just as when sending a general message; but the message sent by him can be read only on the particular machines having the same special contacts, all other machines if in receptive condition receiving a jumble of letters or an unintelligible message. Anytwo or more subscribers may have special contacts arranged in a special manner for theirown use, and when their instruments are set for special work no other subscribers can get the message intelligible.

An instrument of one subscriber may have a special series of contacts for a second subscriber, and yet another special series of contacts for yet a third subscriber; but the special contacts of the second-and third subscribers will not be alike.

Figure 1 is a side elevation andsection of one form of an electromechanical type-writing apparatus embodying this invention, the section being supposed to be taken on the line 00 at, Fig. '7, looking in the direction of the arrow 2. Fig. 2 is a detail in side elevation of a pole-changing apparatus shown in Fig. 1 and to be hereinafter referred to; Fig. 3, a top or plan view of the apparatus shown in Fig. 2; Fig. 4, details of parts of the polechanger and its operating-wheel shown in Fig. 2 on an enlarged scale; Fig. 5, a detail to more clearly show the circuits of the polechanger; Fi 6, a modification to be referred to, it showing an independent motor for rotating the selecting-drum. Fig. 7 is a top or plan view of the magnet-containing case and the parts located therein and shown in Fig. 1. Fig. 8 is a detail of the battery controlling switch shown in Fig. 7 and to be hereinafter described. Fig. 9 is a rear side elevation and section of the apparatus shown in Fig. 1, the section being supposed to be taken on the irregular linecc 50', Fig. 1. Fig. 10 is a detail, on an enlarged scale, of the device employed to rotate the printing cylinder to obtain spaces between the lines; Fig. 10, a detail of the actuating-pawl for rotating the printing-cylinder. Fig. 11 is a detail of a circuitcontroller to govern the return movement of the carriage. Fig. 12 is a diagram of circuits to more clearly show the operation of the apparatus. Fig. 12 is a detail to be referred to; Fig. 13, 'a diagram of circuits, showing three instruments connected together and arranged for intercommunication by means of a single wire; Fig. 13 and Fig. 13 details of apparatus employed in the one-wire system; Fig. 13", a diagram of circuits used in the onewire system; Fig. 13 a detail of switches to be referred to; Fig. 14:, a diagram of circuits, showing parts of the apparatus connected together for intercommunication by a plurality of wires, to be hereinafter designated as the cable system. Fig. 15 is a detail partially broken out and on an enlarged scale of one form of individualizing deviceor combinationswitch; Fig. 16, a detail showing a modified form of individualizing device or combination-switch. Fig. 17 is a detailof the circuitselecting device employed when the machine is used on the one-wire system; Fig. 18, a'detail of the circuit-controller or switch for the call-bell; Fig. 19, a detail of the switch employed to control the backward movement of the carriage in the cable system; Fig. 20, a diagram of circuits to more clearly illustrate the operation of the individualizing device or combination-switch; Fig. 21, a diagram of circuits shown in Fig. 20 with the combination-switch in a different position to obtain a different combination, as for special or private signaling over the same wires. Fig. 22 is a diagram of circuits, represent-ing three instruments or stations connected in circuit in accordance with the cable system; Fig. 23,

a plan view, enlarged and partially broken out of the box containing the circuit-controllers, adapted to be operated by the type keys or levers shown in Fig. 1; Fig. 24, a section.

through the box shown in Fig.28 on the line y y looking toward the right; Fig. 25, a detail of a circuit-controller which in practice is operated by a key. Fig. 26 is a sectional detail, on an enlarged scale, to more clearly show the mechanism for controlling the battery-circuit, the section being supposed to be taken on the line 00 Fig. 27; Fig. 27, a sectional detail on an enlarged scale, the section being supposed to be taken on the line 00 Fig. 26; Fig. 28, a detail to be referred to; Fig. 29, a detail, on an enlarged scale, of a part of the printing mechanism of the type-writer; Fig. 30, a detail of the detachable reinforcing-plate to be referred to; Fig. 31, a perspective view of a motor mechanism shown in Fig. 1 for operating the carriage and the selecting-drum; Fig. 32, a sectional detail of the form of clutch mechanism shown in Figs. 1 and 31 to couple the armature-shaft with the carriage; Fig. 33, a side elevation of a modified form of apparatus with the magnetcontaining case in section, the mechanism being actuated by an electrically-controlled drum; Fig. 34, a detail in elevation of a circuit-indicating device attached to the apparatus and shown in Figs. 1 and 33; Fig. 35, a sectional detail of the indicating device shown in Fig. 34, the section being supposed to be taken on the line y y, looking toward the left. (See Fig. 34.) Fig. 36 is a detail to be referred to, showing some of the buttons or keys used on the one-wire system. Fig. 37 is a top or plan view of the apparatus shown in Fig. 33; Fig. 38, a detail of the motor mechanism shown in Figs. 33 and 37; Fig. 39, a diagram of circuits, representing two central stations or cities connected in accordance with the one-wire system and the instruments in the said cities joined to the central offices by the cable system; Fig. 40, a sectional detail of one form of circuit connection or switchboard used to couple two instruments together; Fig. 41, a detail representing two instruments coupled together on the cable system; Fig. 42, a detail of the one-wire system to be referred to; Fig. 43, a diagram of cir cuits to represent the manner of connecting the electric motors of the various instruments; Fig. 44, a section of the carriage on the line 00 00 Fig. 9; Fig. 45, a detail of the rack-bar of the carriage and drum operating the same.

In illustrating our invention we have shown the principal parts of the Hammond machine usually found in the market; but we have not considered it necessary to show all the parts thereof, as the said machine is well understood.

In the drawings, A represents a bed-plate, A its feet, and aa type or character carrier, (see Fig. 29,) it having upon it the characters to be printed. This character-carrier is herein represented as forming part of a segmental arm mounted loosely upon and to rotate freely about a central stud a.

In practice there are two type or charactercarriers in each type-writer. The hub of each character-carrier has suitable pins or teeth a which are engaged by the toothed inner end of a lever a having a slot a which is entered by an arm a of arock-shaft c0 having a second arm (L12 provided with an adjustable arm a There is a rock-shaft a a rock-shaft a and arm a for each charactercarrier. The type-keys or character-levers d provided at their outer ends with suitable buttons representing letters or figures corresponding with the type-characters of the type or character carrier, have their fulcra on knifeedges a of a block a, properly secured in practice to the bed of the machine. The inner ends of the levers are kept separated by a slotted comb-like guide a, forming part of the bed-plate, and the inner end of each lever terminates under one of the series of vertically-reciprocating pins or rods a, provided with suitable collars a acted upon by suitable springs a which normally keep the said pins or rods down, each lever (1,13 also when moved acting upon the arm a above it to thus effect the movement of the lover a and the vibration of the character-carrier a. The center pivot a contains a stop-lever a which as a character-carrier is oscillated, as described, acts upon and moves the said stoplever with it until its outer end a is arrested by one or the other of the pins or rods c which may be lifted by the particular key then depressed, the said rods or bars acting as stops, and as one or the other is raised to stop the lever a" one or another character of the character-carrier is left in position opposite the hammer a said hammer being actuated to strike a pad e which supports the rear side of the paper to be printed on opposite the usual ink-ribbon c0 and opposite the particular character to be printed. The inkribbon e is taken from one to the other of the reels a, mounted each upon a suitable shaft a having its bearings in like holes (1 one formed in an ear of the top plate a and the other in the feet a of the bottom plate a, in which the pins or rods a reciprocate.

Each shaft a is provided with a suitable worm-pinion 01, which is engaged and rotated intermittingly by a worm (L25 on a shaft a, said shaft having upon it a suitable ratchet-wheel a which derives its motion from a pawl e on a suit-able rock-shaft piv at a and moved by the key-lever.

The framework a of the carriage has connected to its under part a rack 00 This carriage contains a pair of rolls a and a between and by which the paper is fed in the direction of its length, the roll 61, being simply a pressure-roll. The roll 0. has at one end a suitable ratchet al (see Figs. 9 and 10,) which is engaged by a pawl (Z carried by a pawl-carrier d mounted loosely on one journal of the said roll, the said pawl-carrier being notched at one end to be engaged by the projection of a lever c1 mounted on a suitable shaft d in a bearing (1 The rack-bar a is engaged and rotated by external teeth of a drum a containing a spring, the said drum and spring being permitted to act Whenever the detent c1 is released from the ratchet-wheel 01 The devices so far described and referred to and lettered are common to the Hammond type-writer. We will now describe the altera tions and additions which we have made thereto and the means which we have devised for operating the said type-writer as a telegraphic transmitter and permitting it to be actuated as a telegraphic receiving-instrument.

To avoid wear of the upper plate a of the framework of the type-writer,we have added thereto a reinforcing-plate on which the stop-lever a" travels, and as the said plate becomes worn we may readily replace it by another one. The legs A of the type-writer, as represented herein, are set into suitable cup-bearings A supported in suitable manner upon or within a box or case A containing a series of electro-magnets b, one magnet for each lever or character-key of the type-writer. Each magnet, as herein represented, is composed of two coils and has cooperating with itan armature b, operatively connected with the character or type carrier, through the movement of which and suitable intermediate devices the character to be printedwill be brought into printing position. In this embodiment of our invention, as stated,the characters are on a charact-er-carrier (shown as a segmental plate) and each armature pivoted atb is connected by a suitable link, as b to an elbow-lever I), having itspivot upon a rod mounted loosely on a rod b extended across the box or case A. Each elbow-lever b has pivoted to it a link 1), which is extended up through the top of the box or case and through a hole in a suitable guidebar b secured to or forming part of the casting or bar b slotted for the reception and guidance of the key-levers, each link 19 be- 1 ing connected at its upper end with one of said key or character levers, the link having,preferably at its upper end, a hook to fit over or embrace a part of the said lever, so that when a lever b is moved by the attraction of the armature of a magnet the link connected with the armature so moved will turn a lever 11 and depress or pull down a key-lever, the keys actuating the pins or rods and other devices all in manner usual or common to the Hammond type-Writer, to thereby place in position the desired character on the character carrier. The contacts b 6 as herein shown, are arranged in a substantiallyvertical line with and separated from each other by insulation 9 (see Fig. 24,) so that in the movement of a pen or wiper from one contact-plate, as b", to the other contact-plate b a dead-break is made in the circuit. The contact-plate b, as shown, is arranged at one side the contact-plates I) I2 and is located substantially near the bottom of the contactplate carrier I), so that when the pen or wiper b is in contact with the contact-plate b the pen or wiper Z2 will be in contact with the plate b Each cable-circuitcontrolling lever 79 (see Fig. 24:) is held up by a suitable spring b secured to the bottom of the case A and having its free end bearing against the under side of the said lever. The levers b are adapted to and may be moved downward simultaneously, preferably by means of a camshaped depressor Z9 attached :to a shaft Z9 supported. in suitable bearings within the case A and extended across the said case, the said depressor Z9 constituting what we shall hereinafter in some instances designate as a circuit-controller actuator. The depressor will preferably be moved by means of a lever Z9 fast on a short shaft 6 having bearings in the case A and in an upright b and having fast on it a segmental gear 19 in mesh with a pinion Z1 mounted on a stud or arbor 5 (see Figs. 26 and 27,) the said pinion meshing with a segmental gear Z9 on the shaft I9 The lever Z7 has secured to it a locking device, herein shown as a rod 5 adapted to engage a notch 19 in a metal plate or segment 19 and to enter notches Z9 19 in a plate 19 of insulating material, the plate Z9 and the insulated plate 6 being secured to the side of the box or case A the said plate b being secured to the plate 19 for a purpose as willbe described. 17 pivoted, as at b, in lugs or ears h on the lever b the lever 11 having a substantially-long arm 19 by which the said lever may be turned on its pivot to withdraw the locking-bar 12 from one of the notches. The

lockingbar is extended through suitable guiding lugs or studs Z7 17, and between the said lugs or studs the locking-bar is encircled by a spring 12 one end of whichpresses against the lug 19 and the other against a collar Z3 fast on the bar, the said spring normally acting to press the locking-bar into engagement with one of the notches referred to.

Each circuit-controlling lever 19 has eo-opcrating with it a spring b (see Figs. 1 and 24,) to which is connected a Wire h leading to the battery, (see Figs. 12 and 14.), another wire leading to the battery being connected to the spring 19 The shaft b (see Figs. 26 and 27) has mounted upon it a drum 0, of insulating material, provided with two strips 0 0 (see Fig. 8,) extended around the periphery of the drum 0 preferably a little over halfway, and the said drum of insulating material is also provided with acontacting strip 0 extended axially across the drum, for a purpose as will be described. The drum 0 has co-operating with it contact pens or brushes 0 0 located, as herein shown, below the drum, and contact pens or brushes 0 0 located above the drum, the upper and lower brushes being connected electrically by the conducting-strips c 0 when the latter in the revolution of the drulnare brought into contact with the said brushes, the upper brushes being electrically connected at other times by the strip 0 The drum 0, its contact-strips, and the pens and brushes co-operating therewith constitute one form of transforming-switch or circuit-controlling device, by which the instrument may be easily changed from a transmitter to a receiver, and vice versa, and from either to a mechanical type-writer, as will be The rod 11 is jointed to a lever described. The contact pen or brush is connected in circuit with the brushes 11 (see Fig. 14,) and the contact-pen c is connected in circuit with the lower springs 19 while the contact-springs c c are connected in circuit, as will be described, with the opposite sides of the battery. The drum 0 and its contactstrips 0' c 0 form, with their cooperating pens or brushes, one form of a circuit-controlling device or switch for the battery, whereby the latter may be out out and the line closed to complete the circuit through the magnets, in order that the machine may be used as a receiver and the key-levers be electro-mechanically operated through the armatures of the magnets, as will be described. The drum a which by its contained spring rotates the carriage (r in a forward direction, has external teeth which mesh with a pinion mounted on a shaft 0 having hearings in an upright 0 the said shaft having loosely mounted upon it a gear-wheel e in mesh with a beveled pinion e on the armature shaft 0 of an electromotor A which may be of any usual or well-known construction, the

said armature-shaft having mounted upon it a commutator 0 with which co-operate brushes 0 secured to brushholders 0 0 to which the line-wires are oonnected,as will be described.

The circuit of the electromotor is preferably controlled, as herein shown, by means of a carriage-key 0 (see Fig. 19,) extended through a suitable box or hub (see Fig. 1) on the top of the auxiliary box A and pro- Vided at its lower end with a contact-block 0 adapted to be inserted between contact members 0 0 of the switch controlling the motor.

The motor mechanism is designed to be utilized to restore the carriage to its normal or starting position after it has reached the end of its forward feed or movement in the direction of the arrow 200, Fig. 9, and-in order that the armature of the electromotor may not be mechanically rotated during the normal working of the apparatus by the depression of the key-levers a we have mounted the bevel-gear c loosely on the shaft 0 and provided a clutch mechanism,constructed as will be described, whereby the said bevelgear is rendered fast on the shaft 0 when the circuit of the electromotor is completed. The clutch mechanism which we prefer is constructed substantially as shown in Figs. 1, 31, and 32, and consists, essentially, of a disk 0 made fast on the shaft 0 as by the key or pin 0 and provided on its inner face with a series of teeth or notches 0 with which cooperate one or more pins or projections 0 which are extended loosely through suitable holes in the beveled gear 0 and are secured to a disk a, loosely mounted upon the shaft 0, the disk 0 having secured to or forming part of it a hub 0 provided with spiral or cam-shaped grooves 0 which are adapted to embrace or to be entered by pins or lugs 0 secured to ears 0 extended from the upright the disk 0 being normally pushed away from the beveled gear 0 to disengage the pins or projections 0 from the teeth 0 on the disk 0 and to engage the spiral or camshaped groove 0 with the pins 0 by a spiral spring 0 encircling the shaft between the beveled gear 0 and the disk 0 The pins 0 are beveled or inclined on their edges, as at 2, (see Fig. 32,) so as to slip by the teeth 0 on the disk 0 when the beveled gear 0 is rotated in one direction, for a purpose as will be described.

As represented in Fig. 32, the spiral or cam grooves c of the hub are in engagement with the pin 0 and the disk 0 is in its normal position, with the pin 0 out of engagement with the teeth 0 of the disk 0 and the machine at such time is in condition tobe used in regular work without producing rotation of the armature of the electromotor; but as soon as the circuit of the electromotor is completed through the carriage-controlling key 0 (shown in Fig. 19) the beveled pinion of the armature-shaft is rotated in the direction of arrow 21 and the beveled gear 0 is rotated in the direction of the arrow 22, and as the beveled gear 0 is rotated in the direction of its arrow 22 the cam-hub 0 is rotated in the same direction and the said cam-hub is forced forward by the pins 0 until the pins 0 are in engagement with the teeth 0 of the disk 0 and when they are thus engaged with the teeth 0 the beveled gear 0 is locked or clutched to the shaft 0 and the continued rotation of the beveled gear will produce a rotation of the main drum c4 in a backward direction, and the carriage will thus be moved backward or in the direction indicated by the arrow 30, Fig. 9, into its normal or starting position.

In practice the carriage-controlling key 0 will be maintained closed a sufficient length of time to enable the carriages of all the instruments included in circuit. with the particular instrument being used as a transmitter to be brought back to their normal or starting position ready to commence a new line.

In order to prevent jar or shock to the carriage, we have provided a circuit-controller for the electromotor, which is automatically opened by the carriage before the latter reaches the end of its backward movement, and the said circuit-controller is located on the machine, so as to be operated when the carriage has nearly reached the end of its backward movement, the momentum of the carriage carrying it to its normal or starting position. The circuit-controller for the motor referred to (shown in Figs. 9 and ll) consists of a spring strip or plate (1, provided, preferably, with a contact-point d, which cooperates with an upright 01 secured to an insulating-block d fastened to a back plate d,

secured to and forming part of the frame of the machine. The circuit-controlling device referred to is operated, preferably, by a projection d adjustably secured in any suitable manner to a rod 61, fastened to the carriage, the said projection in the backward movement of the carriage striking the spring 61 and withdrawing its contact-point d from engagement with the upright (1 opening the motorcircuit. 7

In order to automatically rot-ate the feedroll 01, to feed the paper and space the same for a new line, we have provided a mechanism, (see Figs. 1, 9, and 10,) which we will now describe. This mechanism, as shown, consists, essentially, of a mechanical switchcam 01 represented as pivoted at d to an upright plate d having secured to or forming part of it, as herein shown, a guide-bar d forming, with a second bar (Z secured to a bottom plate 01 a passage 61 into which extends a roller 01 on an arm c1 pivoted to a crank d" on a shaft 61 having suitable bearings in a lug d secured to or forming part of the carriage, the said shaft having fast on it at its opposite end an elbow-lever d extended toward the cylinder 0, and engaging the forked end 01 of a pawl-carrier (Z loosely mounted on the shaft of the cylinder a, and provided with a pawl 01 in engagement with the ratchet-wheel d fast on the shaft of the cylinder 05 The arm or lever al is provided with a slot (1 into which is extended a pin 61 on the crank-arm d", the said pin acting to hold the arm al in proper position, so as to cause the roller d to enter the passage (Z on the forward movement of the carriage and to permit the said arm to be lifted up by the switch d on the backward movement of the carriage. During the forward movement of the carriage, occasioned by the depression of the key-levers, the roller d enters the passage d and passing under the switch-cam d lifts the latter, and when on the continued forward movement of the carriage the roller (1 has cleared the switch-cam d the latter drops into its normal position, (shown in Fig. 10,) resting upon the bar (Z so that when the carriage is moved backward the roller 61 will travel up the inclined switch-cam d and:

turn the arm 01 of the lever (Z downward or in the direction of arrow 35, Fig. 10, thereby rocking the plate 61 on the cylinder-shaft. and moving the pawl (Z pivoted to said plate,,

into engagement with an adjacent tooth of the ratchet 01 so that when the roller 61 has' cleared the guide-bar 61 a spring on the pivot of the shaft d will throw the arm d downward and will move the arm 01 of the lever 01 in the direction opposite to that indicated by arrow 35, thereby carrying the forked end of the lever c1 upward and by means of the pawl d rotating the ratchet-wheel 61 the distance of one tooth, and thus rotating the cylinder one step, or the distance of one line.

Our improved instrument thus far described is designed to be used on what we designate as the cable'system, in which the magnets of one instrument are connected to corresponding magnets of another instrument.

Each instrument may be used as a mechanical type-writer, as a transmitter, and as a receiver.

When the instrument is used for office workthat is, as a mechanical type-writer the lever 11 is moved in the direction of arrow 60, Figs. 26 and 28, and the locking-bar Z9 is made to engage with. the notch or tooth I), the machine at such time being cut out of the main-line circuit, as will be described, with the exception of the call-bell, which is always in circuit with the other call-bells on the line. This feature may be clearly understood by referring to Figs. 14: and 18. Referring to Fig. 18, the call-bell key is shown as constructed of a block 9 of insulating material, to which is secured a stud or post 9, having a button 9 (marked Gall-Bell in said figure.) The insulating-block g has secured to it on one side, near its lower edge, a contact-strip g and above the said contactstrip the said block has secured to it two independent contact-plates g 9 electrically connected, as by screws or pins g, to like contact-plates g g The rod g is extended through a base block or plate g", to which are secured on opposite sides of the insulatingblock g contact springs or brushes g g g. The contact-springs g 9 have connected to them line-wires 36 37, the latter having connected to it the magnet 9 for the call-bell g fastened to the front of the machine, as shown in Fig. 1. The wire 37 is connected or tapped onto a common returnwire 37 at the point g". (See Fig. 14:.) The contact springs or brushes 9 9 have attached to them wires 34: 35, connected to battery-wires 34 35 at the points g 3g the wires 34 35 being in circuit with the battery B. When it is desired to call from one station, as B to another, as B, the call-bell button g in the station E is depressed and the battery 13' in the station E is put into circuit through the contact-springs g g and plates 9 pins 9 contact-plates 9 and brushes g {112, the wires 36 37, the call-bell in station 13 and wire 37, extended to the station B The circuit of the call-bell is completed through the wires 36 37 brushes 9 g, and contact-strip g on the insulating block 9 of the call-bell keyin the station B The bell g in the station B will ring and notify the operator that station E wants to communicate with station I5 In Fig. 14 we have shown a diagram of circuits representing a sufficient number of magnets of two instruments to enable the adaptation of our improved instrument to the cable system to be clearly understood. In the two stations marked B B (shown in Fig. 14) we have represented only five magnets (marked, respectively, a 19 0 d 6 corresponding to the keys of the instrument. In practice we prefer to have the cable-wires separate from IIC

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