US904743A

US904743A - Electrically printing apparatus.

Info

Publication number: US904743A
Application number: US7654401A
Authority: US
Inventors: Milton T Weston
Original assignee: Individual
Current assignee: Individual
Priority date: 1901-09-25
Filing date: 1901-09-25
Publication date: 1908-11-24
Anticipated expiration: 1925-11-24

Description

Patented Nov. 24, 1908A 10 SHEETS-SHEET 1.

R \\1 lfi APPLICATION FILED SEPT. 25, 190.

LVI YEA/'TOR'.

ifwld L'- MIIIIIIIIIIIII M. T. WESTON. ELECTRICAL PRINTING APPARATUS.

APPLICATION FILED SEPT. 25,1901. 904,743. Patanted Nov. 24, 1908.

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W] T N15 SSE S l/VI/'ENTOK M. T. WESTON.

ELECTRICAL PRINTING APPARATUS.

APPLIOATION FILED sBPT.25,19o1.

904,743. Patented N0v.24,19og.

1o SHEETS-SHEET a.

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1 rn, m 2%@4 M. T. WESTGN. ELECTRICAL PRINTING APPARATUS.

APPLICATION FILED' SEPT. 25,1901.

Patented Nov. 24, 1908.

10 SHEETS--BHEET 4.

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WJTNESSES 0? AUM.

M. T. WESTON.

ELECTRICAL PRINTING APPARATUS.

APPLICATION PILED SEPT. z5, 1901. 904,743, Patented Nov. '24, 1908. 1o SHEETS-SHEET 5.

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M. T. WESTON.

ELECTRICAL ,PRINTING APPARATUS.

APPLICATION FILED SEPT.25,1901.

9643743, Patented Nov. 24, 1908.

10 SHEETSSHBET 6.

M. T. WESTON.

ELECTRICAL PRINTING APPARATUS.

APPLICATION IILBD SBPT.25.1901.

904,743. Patented Nov. 24, 1908.

l0 SHEETS-SHEET 7.

M. T. WESTON. ELECTRICAL PRINTING APPARATUS.

APPLICATION FILED SEPT.25, 1901. j 904,743, Patented Nov. 24, 1908. 10 SHEETS-SHEET 8.

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APPLICATION PILED`SBPT.25,1901.

Patented Nov. 2 4, 1908.

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M. T. WESTON. ELECTRICAL PRINTING APPARA'IUS.v

APPLICATION FILED SEPT. 25, 1901. 904,743. Patented Nov. 24,1908..

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PATENT OFFICE.

MILTOY T. WESTON, OF ORANGE, NEW JERSEY.

ELECTRICAL PRINTING APPARATUS;

Y Specification ofLetters Patent.

Patented Nov. 24, 1908.

Application filed September 25, 1801. Serial No. 76,544.

To all whom 'it lrmiy concern:

Be. it known that I, MILTON T. VEsToN, a citizen of the United States, residing at Llewellyn Park, city of Orange, county of Essex and State o New Jersey, have invented certain new and useful Improvements in Electrical Printing Apparatus, of which the followinof is a specification.

T his invention re ates particularly to typewriters, and generally to any case where character impressions are to be produced successively on a suitable impression-receiving surface.

The object of my invention is to enable the character impressions to be effected more rapidly.

My invention has other` advantages of simplicity in construction and operation, and adaptability to dii'l'erent applications, as will hereinafter appear.

An important feature of my invention is a distributer and selecting device, this distributer `and selecting device having a rapid continuous movement and carrying a plurality of electro-magnetic devices brought successively into connection with the line or controlling circuit` and each of such electromagnetic devices controlling the operation of a corresponding trip device. said trip devices in turn controlling local circuits to perform certa-in functions. The selecting electromagnetic devices are preferably mounted on a continuously rotating carrier, and while each of such devices is in connectionV with the controlling circuit for a small fraction of a revolution, the device Vthat is tripped thereby may have the greater part of a revolution in which to operate. This trip device controls tl e printingr and other local operations, and the time required for it to perform its functions is considerabliv greater than the time required to operate the trip device, so that the rotating selecting device may move at much greater speed g than if the electromagnetic devices had to perform these functions directly.

Another feature of my invention lies in the impression means. The trip devices referred to constitute type levers or impression hammersthat when released assume positions wherein they will, in the revolution of the carrier, strike the paper on the platen, and, on so striking the paper, said type levers are thrown back by their recoil into normal positioit.

My inventionlmight'be applied to a printing telegraph in which case I would employ a receiving instrument which revolves continuously at a comparatively high rate of speed, producing the message in printed form upon a strip, page or telegraph blank and a transmitting instrument which also revolves continuously in synchronism with the receiver and sends out electrical pulses at predetermined intervals, one pulse for each letter, said pulses being either positive or negative, or all of one polarity.

Figure l is a front elevation of my rcceiving instrument, the base being shown in section. Fig. 2 is a transverse vertical sectional view on the line a--a of Fig. l. Fig. 8 is" a lon itudinal vertical section along the axis of t e receiver cylinder.` Fig. l is a transverse sectional view on the line c-o of Fig. 3. Fig. 5 is a sectional rear view of the receiver showing the carriage ope ating mechanism. Fig. 6 is a plan view of cai'- riage operating mcchanismand inlting dcvice. Fig. 7 is a sectional side elevation ol same taken on the line c-e of Fig. (i. Fig. S is a` plan \iew of the carriage. Fig. 9 is a sectional elevation of a ball ratchet for operating the platen. Fig. l() is a vertical section of same. Fig. ll shows a slight modification of the retaining s ,ring latches for the type levers, from that shown in Fig. 4. Fig. 12 is a partial plan view showing arrangement of type bars or levers, spring latches and magnets in the modication shown in Fig. 1l. Fig. 1i) is a` partial vertical longitudinal section through the receiver showing modification in the magnet arrangement. Fig. 1l is a vertical section on the line (Z--fl of Fig. 13. Figs. l5 to l? show a typewriter embodying my invention, the keyboard and distributor of the transmitter being combined with the selecting dcvice of the receiver to form a single instruuicut. and the synchronizing device being omitted. litiga. lo to Ql sho Y :i inoditication in the magnetic tripping device. Figs. to Q4 show as a further n'ioditication, a 'ineelianical tripping means. Figs. 25 and 26 E show diagraminatically the local circuits for |`operating the carriage mechanism of the l printer and t'or synchronizing the receiver.

The telegraph receiver (Figs. l to 10) i comprises a suitable base l, with standards l i l Q projecting therefrom, in which is journaled the shaft 3 of the distributing and sei lecting cylinder et. On one end of the shaft l 3 is attached the armature of a motor 5, for

sets of selecting ma ets 14, 14', and for eachy magnet is provide am armature 15 or,15' that is preferably formed as a spring plate of ma netic material, fastened at one end to the cy inder 4. Thesespring armatures are -oppositely polarized in the .two-setsl, 1 5',

so that the armatures of one set willrespond to impulses of one polarityonly, While those of the other set respond to opposite impulses. Adjacent to the two sets of armaturesl, 15 are the two sets of trip devices, mounted in.

disks

13, 13, 13', 13', on cylinder 4, each trip device comprisin a central body p0rtion 16, 16' pivoted 1n the saidv disks and having at one end the type arm or hammer 17 or 17 and at the other end the

tripuarm

18 or 18', engaging normally under aliook' 151 of the corresponding armatures 15, so that the armatures 15 act as latches to hold the respective :trip devices in normal position, W1th their type-levers or hammers 17 or 17 lying in their innermost position as shown at the bottom of Fig. 3. All of the arms 17, 17' are Weighted at the outer end so that the centrifugal force resulting from the rapid rotation of the cylinder or carrier 4, will tend tc'throW these arms outwardly to the position shown at top of Fig. 3 for anv arm 17. Some of these arms 17, 17' constitute type levers, the Weighted, part or head 17l1 carrying the type characters, and the trip devices being angularly arranged so that the type levers strike at the same point onthe platen indicated at 49, While other arms are blank or free from characters. trip devices are adapted to act as circuit closers for local circuits, contacts 165l on the body or pivot portion thereof being adapted to contact With terminals 19, 19' 1n the insulating cylinder body 4, arranged in pairs for the respective trip devices. Each trip device is normally outof contact with the terminals 19 or 19', but When the trip device is released and is turned by the movement of its arm, say 17, to outer position, shown at top of Fig.4 3, thel trip device bridges their. contacts and closes a'llocal circuit or circuitsconnected thereto. A cushion ring 13a is arranged on cylinder 4 in` position to receive the recoil impact of the

hammer arms

17 or 17 and prevent noise and Wear.

The lcircuit connections of the receiver are j. shown in Figs. 1, 3, the main line 20 being Vvconnected 'to terminals 'or brushes 21,21'

wthe transmitter.

All of thesel bearing on the commutator segments 7, 7 i

`taneously connected to two magnets 14, 14',

one on each side, and as the armatures of these magnets are oppositely polarized, an impulse coming over the line Will aii'ect one vor the other of these armatures according to the nature of the impulse, Whether positive. or negative. In the rotation of the shaft 3, the

commutator segments

7, 7 constitute distributers Wlrereby the pairs of magnets 14, 14' are brought successively into connection with the line 20, so that as an impulse comes over the line it Will operate some particular one of the magnets 14 or 14' ldepending on the rotative position ofthe cylinder 4 at that time, so that if the cylinder rotates in'synchronism With the transmitter, the selection ofthe magnet 14 or 14' will be controlled by Local circuits are provided in the receiver dfor operating the carriage vmechanism of the printer and for synchronizing the receiver.

'A battery 27 energizes allv these local circuits,

a circuit 26, 26' leading from this battery to a pair of

spring contacts

28, 29 on. one side' of the machine, bearing on a pair of cou-tact rings, 9, 10, from which Wires 30 lead to all the pairs of terminals 19 or 19' on both sides of the machine, that correspond to character selecting and Word space controlling trip devices, indicated at mwa?. In this

circuit

26, 26 is included'the magnet25 that controls the step by step carriage feed. (See also Fig. 5.) One trip device markedy g/ in Fig. 25 on one side of the machine is appropriated to the carriage return operation and :the corresponding pair of terminals 19', .is'connected by wires 31. to rings 92,101', and thence by spring contacts 28', 29' and circuit 33, 26,` to the magnet 34 that controls' the return of the carriage, the Wire 26 being a common re-' turn for both of these localcircuits.

The local mechanism controlled by the local circuits 26', 26, v33, 26, and controlling the platen feed along the line and-from line to'line, (Figs. 2 and 5 to 9) comprisesja carriage 35 moving vby l its rolls 36 on fixed guides 37, and a rack 38 von said carriage engaged by a gear 39 on ashaft 39'? actuatedby a spring 40 to drive the carriage m one d1- rection. A ratchet rack 41 isralsoattached to carriage 3 5 and is engaged'byv anoperating pawl 42 carried by the armature, lever 43 of the feed magnet 25 sothat oneachclosure of the local circuit 26',` 2 6, the carriage will be moved forward one step, a retaining pawl 44 holding the rack inadvance positionwhen ics the armature lever is again retracted by suit able means.- In order toreturn the carriage-@39" 'automatically at the end of a line, a trip device is provided, consisting of an armature lever 45 for magnet 34, said lever 45 engaging with pins on both of the

pawls

42, 44.

`upon energization of magnet 34 to disengage `the latter reaches the starting point when a pin 35a thereon strikes latch 45a and releases the armature arm 45, permitting the

pawls

42, 44 to rengage'the `arriage rack. .as the carriage approaches the starting point, an arm 47a on a feed device 47 on the platen shaft engages a Xed slotted cam device 48 which serves to turn the platen one step for feeding from line to line. The feed device 47 preferabh consists of a ring embracing a disk 4Qa on the platen shaft, :and a ball clutch v4T in said ring and engaging with said disk.

An inking means provided, consisting ot a roll 50 of felt or other suitable material, containing ink'and located in position to roll against the faces of the type characters in the rotation of the carrier 4 when the type devices are in inner or normal positions, the roll 50 being rotated bythe contact of 'the type. t

To synchronize` the receiver with the transmitter I provide the motor ortelectromagnet-ic device 6, and an electromagneticallyI opeated switch, adapted to closey the circuit to said motorv periodically, say once in each revolution, so as to aid or resist the :rotative effect of the main motor 5. The system ot circuits for synchronizing 4is shown in- Fig. 26 and comprises a local battery 51 for operating the motor a reversing switch or pole changer 52 for reversely connecting said battery through circuit wires 53 with the armature of said motor, two

magnets

54, 54 operating reversely on said switch. The local battery is connected through said magnets to

brushes

56, 56 bearing on the collector rings 11, 11 on opposite ends of the cylinder 4,

.these rings being connected with a terminal 19 or 19 on each side of the machine, adapted to -be connected with a corresponding

terminal

19 or 19 by` one or the other of a particular pair of the trip .device circuit closers 16, 16', such other` terminals 19 or .19 being connected .to the respective rings 10', 10 from which the connection 26,.above referred to, leads back to the battery 27. These special tripdevices are indicated at z--z in Fig. 26. At the moment or portion of the revolution that isappropriated to synchronizing,-the transmitter sends over the line two'successive impulsesfof opposite polarity, and at this time the contacts 7..'7 on the receiving distributer which are engaging the brushes will be those-Which are connected to the particu- 'lar pair of

magnets

14, 14 that control l through these trip devices the

iwal magnets

54, 54, above referred to. There is a slight interval between these opposite impulses, and if the receiver is in synchronism, the interval -will correspond to the time elapsing between the contact oi" brush 21 with the conmiutator segment 7 leading to magnet 14 and the contact of brush 21 with the commutator segment T leading to magnet 14,`so that. no current is sent to the

magnets

54 and 54 and the switch 52 is not operated, but if the receiver lags, it will receive a portion of the second synchronizing impulse which will operate the electromagnet 14 on one side, closing the local circuit to one of the pole changer magnets, say 54, and sending a circuit through the armature of the synchronizing motor so as to accelerate the receiverf The synchronizing motor thus acts concurrently with the driving motor 5, to accelerate or to retard the carrier shaft, as may be required. If the distributer then gains in speed so as to run ahead of the transmitter, the opposite effect takes place. In starting, the switch 52 will be set for acceleration, so that the receiver will run up to speed and will then be-checked, the pole 4changer throwing the impulses through the armature. to accelerate or retard as may be required. As shown in Fig, 2G, the transmitting tape is narrower than the space between the particular contacts 69il which send current to the synchronizing magnets, so that this synchronizing operation is not atected by the tape and takes place in the same manner whether tape or keyboard transmission loe used.

The impulses that comeaalong the line op erate the receiver in the following manner. At the time Athis impulse is received` some one pair of contacts 7 7 is in contact with the fixed line contacts 21 and 21' and the corresponding

magnets

14, 14 are therefore in connection with the line, sothat the impulse received will energize both of these magnets, but on account of the opposite polarity of the armatures 15, 15', only one, say 15', will be attracted, and the corresponding trip device will be released. The current passes through the receiver as follows: From

line terminal

21 or 21 through

contada

7 or 7 to a

magnet

14 or 1 therein by

wires

22 or 22 to ring S or 8 and by

contact

23 or 23, to earth, returning to the other

pole ot battery

81 or 81. As soon as released, the trip device will be moved by centrifugal action to its outer position, the weighted end traveling in the path indicated by dotted lines in Fig. 2. As the carrier 4 continues to rotate thus, it will eventually carry the weighted arm which has been thus projected, forcibly -against the platen 49 or againstthe paper impression receiving surfacc thereon. This4 arm in the case ot mostof the trip devices, carries a printing type so that the trip dem vice acts asa character-selecting means, and by its impact against the paper will effect the impression. The type lever 17 then imvto mediately rebounds by the eifect of the blow on the platen, and flies back to normal position close to the cylinder and is caught and held by the latch device. The type-are kept continually inked by roll '50 so that when they strike the paper they will print the corresponding character thereon. The opera-- tion of the trip device 16 as above described, results in closing the-local circuit of the carriage feed magnet Q5, and ihe'carriage is moved vforward one step.

One `or more ot the trip devices is appropriated to Word spacing and has no type but controls the spacing magnet 25 like the other trip devices. In `Fig. 3 l, haveI shown'thc two blank trip devices at the bottom, and one may be assumed to be a spacing device and the other the carriage return device.

It Will benoted that the'impression is effected by a blow delivered substantially perpendicular to the platen or impression surface, Giving a sharp impression and capacity for manifolding. I believe that this eliiect with a continuously rotating type carrier is new and it combines the advantage of strong and sharp impressions, with extreme rapidity of operation, the latter only by the speed of rotation. It Will also be noted that during any one rotation of the distributer and selecting cylinder 4, the number of characters selected may be one, two or more, according to the sequence in which the characters are selected by the transmitter, and the order in which they occur on the type carrier. This is true even lif only one complete alphabet vbe used in the type-carrier, in practice, the more frequently occurring letters, such as e and t may be distributed in several places on the type` carrier. so as to still further increase the number of impressions that may be made during a single rotation. c

Various moditications may be made in the construction of the apparatus Without departing from my invention. Thus applying the invention to a typewriter the key board and distri buter ot' the transmitter may be combined `with the lselecting devices of the receiver to form a single instrument and the synchronizing devices would ot course be omitted. such an embodiment. of ily invention, the distributing cylinder 4, Contact .rings 8, 9, etc.. andtwo series of selecting

magnets

14, 14 are arranged as above described, the whole being supported on a suitable base l, but the commutator segments 68 which are connected respectivelyY to the magnets t1. 14', are arranged in spiral order, to contact respectively with a series ot' contact springs G9 controlled h v a plurality of keys .Si through intermediate impact or momentum being limited In Figs. 15 to 17 I have shown devices 83 and spring retainers 8421s above described in connection with the transmitter. The respect-ive spring contacts 69 arereset after each operation by th` magnet 89, in a two sets and controlled respectively by the two sets of magnets 14, 14.- A motor 5 "is providedvfor driving the cylinder 4. The

omitted, and the-local devices for feeding lthe carriage may be the same as above described for the receiver. In the operation ing machine, the impulses transmitted two rows of such armatures and magnets, as in Fig. 1, I have provided a single row, each armature being double, as shown at 15,15", `with oppositely polarized parts so'thatone according to the direction of t-he pulse through the magnet 14. TWO trip devices are shown for each magnet 14, engaging by the arms 18, 18b with the hooks of respective parts of the corresponding latch armature the controlling impulse.

In some cases I may

devices

15, 16, 17, 18 on the rotating cylinder or carrier, and arrange the electro-magnetic controlling mea-ns in xed position onjthe latch armatures 15 coming necessarily opposite same in the rotating of the carrier, so that the selection of the trip device operated depends on the time that the impulsepasses in the controlling circuit, and by `making the springl latch armatures 15 of alternately opposite polarity, the selection may also `be made to depend on the direction of polarity ot the impulse.

Instead of depending on centrifugal action *tor the operation of the trip devices, springs may be used to effect a similar rebe radial. 'Ioreover the tripping of the'devices may be clt'cctcd by mechanical instead of electro-magnetic means. Thus in Figs. 22 to 24 I have shown pins 110 sliding in a lined 'frame 1 and operated by keys or by any i suitable means, g normal position by springs 110 and engaging when operated with tappeisor lugs 111 l ou radial shafts 111, each being acted ou by local `circuit controlled byr the trip devices. 91. 91', which are in this case arranged in y synchronizing devices and main circuit are of the keyboard mechanism of this typewrit` through the contacts ($9, 68,*will pass dilatc'h spring or selecting armatures that control the trip devices. In place of having or the other part of theA armature is attracted so that one or the other trip device of a pair. will be released according to the polarlty of machine, as shown in Figs. 13 and 14. InA this case only one magnet 14 is required, they mount only the tripy I 12o snlt, and the movement in that case need notA these pins being pressed to a spring 112 to hold the lug 111 in position to engage the corresponding spring 11() when thelatter is pressed by the operator. The respective lugs 111 are at dilierent distances from the center of the shaft 3 carrying the Wheel -i in which the radial shafts 111 are mounted, and the pins 110 are located at corresponding distances from said shaft so as to engage only the corresponding lugs. Each shaft 111 has also a lug or arm 111", engaging an arm or a trip device on shaft 116 pivoted in vadial position on Wheel tand impelled by a spring 116 so as to turn in a direction transverse to thc radial shaft, thereby bringing its hammer` arm 117a in position to impinge on theplaten roll 49 in the rotation ot wheel et', the rebound from said platen causing the device 1171, 116 to be restored to normal position, in Which it is caught and held by the latch device 111, 111. It will be noted that the movement of the impression device in this instance is not radial to the a xis of the carrying means, but is tangential or transverse to the radial direction, as it loes not depend on centrifugal force.

Although the latch armature and trip device is advantageous as giving a quick'and sensitive action, I consider it within my invent-ion to use electro-magnetically controlled selecting devicesof any nature rotated with the carrier andbrought successivelyy into position or condition to be controlled by the controlling circuit. Thus these devices may be simply armature de es held in by springs and drawn out by their magnets (or vic-e versa\ to position in which they will strike the platen or perform other functions.

Figs. 18 and 19 illustrate a t'orm wherein the series ci" magnets 11 operate torhold the impression devices in inoperative position` through their arma-tures 15 which are formed as arms on the shafts 1G oit the impression.

devices, and are included in local circuits 119 normally closed by contact springs 120, act ing as armatures tor another series ot' magnets 14: which are connected through the. ccinmutator segments T and ring 8 with tlu` controlling circuit, similarly to the magnets '14 in Fig. 1. The said local circuits 119 arc connected through the magnets 14C to a collector ring 121, While the contact springs 120 contact with a collector ring 121', these collector rings being connected through ixed spring contacts with a battery 123. lVhen 4any magnet of the series 14, is operated as above described in connection with Fig. 1, it opens a local circuit at 120, 121 and the. corresponding magnet 14 is denergized allowing its impression device controlled thereby'to tiy out to operative position.

In Figs. Z0 and 21 iS shown a form whereinthe magnets operate to draw the impression devices 17a into operative position, springs 11G acting on the shafts 16 of the impression devices serving to normally hold the same in inoperative position, while armatures 15 on said shaft 16 are pulled by the magnets 14 to move the impression devices into printing position vfhen the magnet is energized.

I, have described in this application the construction and operation ot' an electric receiver for teleoraphs, because the same is in the main similar to the electric typewriter, but the right is reserved to claim i e receiver for electric telegraphs in a subsequent application.

Having thus described my invention, the y following is what I claim as new therein and desire to secure by Letters Patent 1. In a printing apparatus, a plurality of electro-magnetically controlled trip devices, a ycontinuously moving carrier on which said devices are mounted, and printing means controlled by said trip devices.

Q. In a printing apparatus, a continuously moving carrier, a pluralityof electro-magnets and trip devices operated thereby, and mounted on said carrier, printing mea-ns operated by said trip devices, distributor contacts on said carrier, and a controlling circuit and terminals coperating therewith to connect the electro-magnets successively with the controlling circuit.

3. The combination of the continuously n'ets and trip devices for rthe purpose described and operated thereby, mounted on said carrier, a controlling circuit and distributer contacts putting said electro-mag- 1 nets successively in connection with said controlling. circuit.

4. In a printing apparatus, a plurality ot' electro-maguetically controlled trip devices, a carrier on which said devices are mounted, means :for moving said carrier and printingl means controlled b v said trip devices.

The combination with the continuously rotating a-rricr. and a plurality of devices plvotaltv mounted thereougot weights disposed upon said devices lin such positions as to cause the carriers to tend to tly outward by centrifugal force during the rotation of said carrier` means tor'holding said devices inwardly against the influence of said weights, and means for returning said devices to inward position. y

G. The combination with thc plattl the rotary carrier having its axis ot' rotation pa allel with the axis of said platen, and a plurality of printing devices pivoted to said carrier; of weights disposed von said printing devices at such positions as to cause the devices to tend to move outward by centrifugal force into positions wherein the rotation of the carrier will cause them to surface and rebound'inwardly away from striking position.

moving carriei-a plurality ot' electro-mag-` gal force, latch devices 7'. In a printing apparatus, the combination with the continuously rotating carrier, of a plurality of type levers pivoted thereon and tending-to swing outward by centrifufor holding said type levers from outward movement, electromagneticc'cntrolling means for said latch devices, anda platen cooperating with the type levers When'-they are in their outer position; g v

8. In a printing apparatus, the combination with the continuously rotating carrier, of a plurality of type levers pivoted thereon and tending to swing outwardby centrifugal force, armature latch devices for hold'- ing said nient, a plurality of magnets mounted on said carrier, and' controlling said armature latch devices, adistributer placing said magnets successively" Iin connection with a oontrolling circuit,"and a platen cooperating with the type levers when in theirJ outer position. l

9. In a printing apparatus, the combination with' a platen, of a rotatable carrier, a character impression device pivoted on said carrier and having a tendency in the rotation thereofto'move into a4 position in which it Will strike'the platen or the impression surface thereon, means for holding said impression device out of cooperating relation with the platen, and means for releasing said holding means.

10. In a printing apparatus, the combination With the platen, of a rotatable carrier, la series of character impression devices pivoted on said 'carrier and adapted, in .the rotation of the carrier, to move into positions in which they will strike the platen or the impression surface thereon, a series of latch devices 'for holding said impression ldevices out of coperating relation with the platen,

-a controlling circuit and electro-magnetic means controlling saidV latch devices and putting the same successively under the control of said circuit..-

' 11. In av printing apparatus, the rotating carrier, trip devices carried thereon conivp'rising type carrying devices and blank devices, means for selectively operating said tripdevices, a platen, and feeding means therefor controlled by said trip devices.

12. AIn a printing apparatus, a rotating carrier, character-selecting devices mounted thereon, blank space-selecting devices also mounted thereon, said character-selecting and blank space-selecting devices having a tendency to move from a normal to abnormalv position when released,`a platen c0- operating with .all said devices to return sameto normal4 position, means for holding the said devices'iin-normal p'ositio'n'and feedcontrollin :mechanism yfor said platen controlled by oth character-selecting and blank Space devices'when in .abnormal position.

type levers from outward move` Vengage the platen in magnetically space lever,

@cette 13. In a printing apparatus, a platen, al rotating carrier, character-selecting devices, blank'space-selecting devicesy and platen return controlling devices, all mounted on said carrier, means forA selectively operating said devices, and means -controlled by the character and blank space-selecting means when 11i operated position to feed the platen, .and means controlled by the platen return controlling device when in operated position, to return the platen.

14. In a'printing apparatus, rotating carrier, blank space-seleoting devices, and platen return controlling devices, also blank, all mounted .on said carrier, electro-magnetic means for selectively circuit controlling devices mortited on the carrier and controlled by the respective devices aforesaid, and platen feeding and re turn magnets and circuits, connected with said controlling devicesv to feed the carriage on `the operation of a character or `blankspace-selecting devices, and to return the platen on the operation of a platen return a platen, a

' controlling device.

printing apparatus, the combina-A .'15. In a tionv with the platen; of a rotating carrier and a type lever pivoted on said carrier and having4 its weight so disposed relativelyto its pivot as to cause it to tend to move outward by centrifugal force into position to the rotation of the carrier.

116. In a printing apparatus, the combinacharacter-selecting devices, Y

operating said devices,`

tion with the platen; of a rotating carrier, of y y a type lever pivoted thereto and havingv its Weight so disposed relatively` to its pivot as to cause the'type lever to tend Ward by centrifugal force and bring the type agaitistffthey platen by the movement ofsaid carrier, said lever being pivoted at such a point as to' cause the type lever to turn on its carrier so as to allow the ty e to be moved away from the platen by the fierce of its impact thereon.

17. In a n tion with a platen, of arotatable carrier, a character impression'device pivoted on said carrier and tion thereof toinove into a position in Which -it will strike the platen or the impression surface thereon, means for holding said im# pression device out of coperating relation with the platen, an inking ,device consisting -of an inking roller engaging with the type when the'type are in ino erative position, and means for releasing said holding means. 18. The combination of the rotating carrier, the plurality of selecting devices car ried thereby, each comprising an electropivoted trip device normally engaged by said latch and constituting a typev or blank terminals on said carrier en havingva tendency in the rota-A to iiy outprinting apparatus, the combina- Y controlled spring latch, a

gaged by said trip devices, a circuit connected to said terminals, an electro-magnet lcontrolled by said circuit, andarriage feeddescribed in combination with means for holding said trip devices against centrifugal action, and cushion devices to check the rebound oE the trip devices.

20. In a printing apparatus, the combination of oppositely polarized armature devices mounted on rotating supporting means, character and space-selecting devices governed by said armature devices, electro-magnctic controlling means 'for said armature devices; and means for receiving selective impulses of opposite polarity and sending them through said magnet.

2l. In a printing apparatus, the combination of a rotating carrier, two sets of oppositely polarized armatures thereon, character and space-selecting devices controlled by said armatures, two sets of magnets for the respective armatures, distributer contacts on the cylinder and circuit connections thereto to put a controlling circuit in communication successively with the magnets, and to simultaneously energize magnets which are operative upon armatures ot opposite polarity, substantially as and for the purpose set forth.

' MILTON T. WESTON.

Witnesses:

J. GREEN,

A. P. KNIGHT.