US2007227A - Printing instrumentality for typewriting machines - Google Patents

Description

M 9; 1935. F H TREGC; 2,007,227

FRINTiNG INSTRUMENTALITY FYOR TYPEWRITING MACHINES Filed Nov. 15, 1950 e Sheets-Sheet 1 "a Q INVENTOR Fra/M'HT/zego.

A TTORNEY July 9, 1935.

F; H. TREGO PRINTING INSTRUMENTALITY FOR TYPEWRITING MACHINES File d Nov. 15, 1930 6 Sheets-Sheet 2 mvENToR fi'd/Mhf Treqo,

% ATTORNEY July 9, 1935. 2,007,227

PRINTING INSTRUMENTALITY FOR. TYPEWRITING MACHINES F. H. TREGQ 6 Sheets-Sheet 3 i INVENTOR flan/r H Trega ATTORNEY Filed NQV. 15, 1950 July 9, 193s.

F. H. TREGO 2,007,227

PRINTINGINSTRUMENTALITYFOR TYPEWRITING MACHINES v Filed Nov. l5, 1930 6 Sheets-Sheet 4 INVENTOR fian/r/i 772990.

ATTORNEY.

Jul 9, 19 35. I ;0 I 2,007,227 I PRINTING IN-STRUMENTALITY FoR TYPEWRITING MACHINES Filed Nov. 15, 1930 e Sheets+Sheet 5 \7! JNVENTOR 'fi'an/r rrega.

chine known as the Varityper in which there is tate the operation of the printing instrumentali- Patented July 9, 1935 PATENT "OFFICE- PRINTING ms'ramms'rm'rr. son mswmrnve mcnnms Frank H. Trego, New YorkyN. Y., asslgnor, by

mesne assignments, poration, New York, Delaware to Ralph C.

Ooxhead 00r- N. Y., a corporation of Application November 15,1930, Serial No: 495,872

21 Claims. (01.19'1-49) This invention relates to typewrlting machines and more particularly to improvements in printing instrumentalities therefor;

The invention is shown as applied to the maprovided a type shuttle which may be rotated through various angular distances, by the keylevers, to select the desired type subsequent to which a hammer is operated to strike against the shuttle to print on a work-sheet disposed betweenthe shuttle and thehammer.

An object of the present invention is to facilities and to ease the touch on the keys of the keylevers to thus expedite the operation of the machine.

A feature of the invention relates to means including a. pair of electro-magnets or solenoids to actuate the type shuttle; the key-levers being divided into two sets, one set at each side of the middle of the machine, and each set having associated therewith a universal bar to be actuated by any. one of the key-levers of the associated set to close a switch in an electric circuit, including a source of power andthe solenoid, to energize-the latter. Upon'the energization of the solenoidthe plunger thereof is sucked thereinto and this motion is imparted, through suitable means connected with the plunger; to actuate the shuttle in one direction against the action of a return spring. The other set of keylevers has associated therewith similar devices, including a universal bar and a switch whereby the other solenoid may be energized. to actuate the type shuttle in the opposite direction.

The usual indexing devices or stops which are operable by the key-lever are used to accurately position the type-shuttle with the selected types at the printing point.

Another feature of the invention relates to means including an electro-magnet or solenoid to actuate the printing hammer and a spring to cock said hammer.

Anotherfeatureof the invention relates to means operable by either universal bar to close a normally open switch in a circuit including the source of power and the hammer solenoid to ently of the key levers, for a subsequent operation. To this end resilient means in'the form of a detent is provided to hold the switch closed; the operation of the switch, to open it, being initiated by the hammer, and the completion of its actuation being effected by the detent.

Still another feature of the invention relates to means for altering the position of the coil of the solenoid relatively to its plunger to thus vary the blow of the hammer against the type shuttle in accordance with the requirements in manifolding, or to compensate for various sizes of types, as pointed out in my application, Serial No. 399,732, filed October 15, 1929, now Patent 1,9181300, July 18, 1933.

. Other features and advantages will hereinafter appear.

In the drawings which form part of the specification. a

Fig. 1 is a sectional side view of the machine;

Fig. 2 is a sectional top plan view of the machine taken on the line 2-2 of Fig. l;

Fig. 3 is a sectional front view taken on the line 3-3 of Fig. 1;

Fig. 4 is a detail sectional view of a portion of the switch associated with the shuttle operating electro-magnet or solenoid;

Fig. 5 is a rear view of the machine.

Fig. 6 is atop plan view of part of the type shuttle operating means;

Fig. 71s a detail sectional view taken on the Fig.- 8 is a rear view of the escapement mechanism showing it completely operated, before its return to normal and the switch of the hammer circuit about to happ ned;

Fig. 9 is a view similar to Fig. 8 but showing the switch opened;

'Fig. 10 is a diagram of the electric circuit;

Fig. 11 is a detail sectional view taken on the line IIH 01118.1; and

Fig. 12 is a top plan view showing the solenoids for operating the shuttle and the solenoid which actuates the hammer. Similar reference characters represent similar parts throughout the'several views.

. The machine includes a main frame 20 pro- 'vided with tracks 22 upon which is supported a carriage 23 to travel back and forth through the medium of anti-friction balls or rollers 23'. The carriage is provided with feed rollers 24 and 25 by' which a work-sheet 26 may be fed upwardly 'between a type csrrier or shuttlefl and a hammer 20, the latter being located behind the work sheet.

The type shuttle I1 is located 'in front of the work sheet and is supported on an anvil secured to a shaft 3| suitably supported by a crossbar 32 and a plate 33 on the main frame. The shuttle 21 is actuated by a lever 34 connected thereto by an upwardly extending finger 35 engaging a fin 36 of the shuttle, which fin extends through a slot 31, in the anvil 36, the fin serving also to support the shuttle on'the anvil.

The shuttle actuating lever 34 is secured to a sleeve 36 rotatably supported on the shaft 3| and bearing on the cross-bar 32. Said lever may be actuated clockwise and counter clockwise (Fig. 6) from a central position, by means including levers 46 and 4|, respectively, secured to the upper ends of vertically disposed rock- shafts 42 and 43 supported at their upper ends by a fixed bracket 36 and at their lower ends by fixed brackets 36' and 36 (Figs. 1 and 3); said shafts being actuated by means hereinafter described. The shuttle actuating lever 34 is normally locked in its central position (Fig. 6) by pins 44 and 45, on the levers 46 and 4|, which engage shoulders 46 and 41, respectively, of said actuating lever. Springs 48 hold the levers 46 and 4| in their normal po sitions where they are arrested by adjustable stops 46 abutting against fixed lugs 56.

As the rock shaft 42 is actuated, in a counter clockwise direction (Fig. 6) the pin 44 moves away from the shoulder 46, on the shuttle lever 34, and against a cam 5| to actuate said shuttle lever, in a clockwise direction about the shaft 3|, to thus actuate the type shuttle 21 to carry the selected one of the types 52 to the printing point.

When the lever 46 returns to normal the pin 44 engages the face 46 of the shoulder 46 to swing the lever 34 back to normal. It will be understood that when the lever 4| is actuated the pin 45 engages a cam 53 to actuate the shuttle lever 34 in a counterclockwise direction to select one of the types to the right of the shuttle; said pin engaging the surface 41* of the shoulder 41 to return the shuttle lever 34.

To accurately register the selected types at the printing point indexing devices or stops 55 are provided, one associated with each key-lever 66, and actuable thereby, against the action of return springs 55, to project the upper ends into the path of. an arm 56* of the shuttle actuating lever 34,

The rock shaft 42 is actuated by a solenoid 51 comprising a sucking coil 56 and a plunger 56; the coil 58 when energized drawing the plunger 56 thereinto to actuate an arm 66, secured to shaft 42, through the medium of a spring 6|. The shaft is thus rotated in a counterclockwisedirection (Figs. 6 and 12) to effect the actuation of the shuttle actuating arm 34 as previously described. The other rock shaft 43 is actuable similarly by a solenoid 62 comprising a coil 63 and a plunger 64, the latter being connected, through the medium of a spring 65, to an arm 66 secured to the lower end of the shaft 43. It will be understood that the springs 6| and 65 are provided to eliminate the shock, which would be otherwise occasioned, of the shuttle actuating lever against the stops 55. Each of the solenoids 51 and 62 is provided with a frame 61 of soft iron suitably secured thereto and forming a path for the mag,- netic flux, and each solenoid is supported by screws 66 on brackets 68 and 66 secured to the main frame 26.

The solenoid 51 is connected in an electric circuit including a source of energy 16 (Fig. 10) connected to a ground 1| and a conductor 12 which is connected to the solenoid 51. A conductor 13 extends from the solenoid 61 to a normally open switch 14 comprising a fixed contact 15 and a movable contact 16, the latter being connected by a conductor 11 to the ground 1|. The conductor 12 is also connected to the solenoid 62, the latter being connectible to ground 1| by a conductor 66, contacts 6| and 82 of a switch 63 and a conductor 64 extending from the contact 62 to the ground 1|. A main switch 64 is provided for connecting the machine with source of energy 16. Thus it will be understood that by closing either of the switches 14 and 63 the associated solenoid 51 or 62 is energized to operate the rock shaft 42 or 43 and thereby actuate the type shuttle 21 either clockwise of counterclockwise (Fig. 6) from its central position as previously described.

The key levers 56 are divided into two sets, one set at each side of the middle of the machine; said sets having associated therewith universal bars 85 and 66, respectively, said universal bars forming portions of frames 61 and 66 supported for independent movement on a shaft 66 when actuated by the rear ends of the key-levers.

The movable contact 16 of the switch 14 is supported on a bracket 66 (Figs. 1 and 3) and is insulated therefrom, said bracket being adjustably secured to the frame 61 by a screw 66. As the frame 61 is actuated, by the key levers, the contact 16 is carried upwardly therewith into engagement with the contact 15 of the switch, thus closing the latter to effect the energization of the solenoid 51 to actuate the type shuttle until it is arrested by the lever 34 contacting with the operated indexing pin or stop 55.

From the foregoing it will be understood that the universal bar 65 is to the left of the machine and that it is operable, by any one of the set of key levers to the left of the middle of the machine, to close the switch 14 to effect the energizetion of the solenoid 51 whereby the type shuttle is actuated in a clockwise direction (Fig. 6).

When any one of the right-hand set of keylevers is operated the universal bar 86 is actuated thereby to close the switch 63 to effect the energization of the solenoid 62 and thus actuate the type shuttle in a counterclockwise direction.

The contacts 15 and 6| of the switches 14 and 63 are each supported in a block 6| of insulating material secured to the frame of. the machine (Figs. 1 and 4) by screws 6|.

The universal bars 65 and 86 are actuated still further after their respective switches 14 and 63 are closed,and the shuttle actuated accordingly to effect actuationof the carriage escapement and the actuation of the hammer 28 in a manner hereinafter described. To permit this further movement of the universal bars the contact elements 15 and 8|, of the switches 14 and 63, are each movable against the action of a spring 62 (Fig. 4) contained within a housing 63 which fits tightly into the block 6|. A terminal 64 is secured to the housing 63 to which the conductor 13 or 86 may be attached by a screw 64.

The carriage 23 is connected by the usual rack 66 with a pinion 61 of the carriage escapement 66 which is actuable by either of the universal bars 66 and 86. To this end the frames 61 and 66 of the universal bars (Figs. 1, 2 and 11) have each a cross-bar 66 provided with a set screw I66; the screws |66 engaging arms MI and IN secured to the shaft 66 to rock the latter. Said shaft 66 has secured thereto a rearwardly extending arm I64 which, when actuated, operates a dog-rocker |62 about its pivot I62"- (Fig. 5) to carry a fixed dog I62 into the path of an escapement wheel I65 supported on the shaft I66, the

escapement wheel having the usual one-way driving connection (Fig. 2) including a. springpressed pawl I01, on a disk I01 rotatably supported on'the shaft I05; the pawl I01 engaging a ratchet I00'secured to the escapement shaft I06; the carriage being urged leftward in Fig. 2 by the spring drum I09 which is connected to the carriage 23 by the strap H0; the action of said spring drum tending to rotate the escapement wheel, upper and leftwardly (Fig. 2) through medium of the pawl I01 and ratchet I00.

After the dog I02 has entered the path of the teeth of the escapement wheel a loose dog III is swung about its pivot III, out 'of engagement with said escapement wheel, by an arm I I2 hav-' after it is carried upwardly, is swung into the path of the next adjacent tooth of the escape ment wheel by the return movement of the dog rocker I02. Upon the rotation of the escapement wheel, subsequent to its release from the dog I02", the loose dog returns to normal, thus completing a letter feeding movement of the carriage.

The means to actuate the printing hammer 20 includes a solenoid I20 (Fig. 1) which is connected with the source of power N (Fig. 10) by a conductor I 2I and the conductor 12; thesolenoid I20 being also connected in series with a normally open switch I22- and a normally closed switch I23 by conductors I24 and I25, respec-- tively; the switch I23 being connected to the ground II by a conductor I26.

The switch I22 includes a relatively fixed contact 'I21 supported in a block I20 of insulating material adjustablysecm'ed (see Fig. 5) to the main-frame 20 by screws I29. The-switch I22 further includes a contact I00 supported in a block "I of insulating material secured to the dog rocker I02 so that when the latter is actuated as previously described the contact I30 is carried downwardly against the contact I21 to close the circuit in whichthe coil I05 of the solenoid I20 is connected to energize the latter. Uponthe energization ofthe coil I 05 a plunger I31 is sucked thereinto to swing the hammer 20 about its fulcrum'I001(Fig. 1); the plunger I01'b'eing connected by a link I30 to an arm m secured to the hammer 20. It will thus be understood that the solenoid not only actuates the hammer 20 to print but also assists the actuation of the escapement through the medium of the pin 6. After the printing operation-of the hammer 20. the solenoid I20 is de-energized, in a manner hereinafter described, and the hammer is then restored to normal by a spring I connected to the arm I40 and a fixed bracket I42. The feed-v ing movement of the carriage, through the medium of the pin I I5, which connects the hammer with the dog carrying frame II5 of the escapement mechanism, may assist in returning the hammer to normal. On the other hand the spring I, through the medium of the hammer 20 and the connecting pin II6, assists. in retuming the escapement to normal thus relieving the carriage and consequently expediting the operation of the machine.

To insure engagement of the contacts-I21 and I00, of the switch I22, one of its contacts (I21) may be resiliently supported in its block I28 to yield against the action of a spring I43 so that the contacts I21 and I30'may engage each other before the dog rockerl02 has completed its motion to its operated position.

To de-energize the solenoid I20 after printing, the switch I23 is automatically opened. Said switch I 23 includes, for this purpose, a fixed contact I45 on a block I46 of insulating material (Figs. 5, 8 and 9) mounted on a bracket I41 se-' cured to the main frame 20. Co-operating with the contact I45 is another contact I48 supported on a bell-crank lever I49 pivoted by a screw or stud I50 on the bracket I41. A detent spring I5I, secured to the bracket I41, acts through the medium of a roller I52 on one side of a nose I53 of the bell crank lever I49 to hold the switch I closed as in Fig. 5. I

The operation of the switch I23 to open it is initiated by the hammer during its actuation to latter about its pivot I50 in a clockwise direction until thepoint of the nose I53 wipes past the .roller I52 of the'detent to the position in Fig. 8

where, it will be seen, the switch is still closed although the switch lever I40 has been partially actuated; the contact I40 being slidably supported for this purpose on the switch lever I45 andv being urged toward the contact I45 by a spring I56 (Fig. 7). The contact I40 is supported in a housing I 51 supported in a block I51 of insulating material which is attached to-the switch lever I49 as indicated in Fig. 7. l

It'will be understood that the printing of the hammer hascompleted its operation when the switch reaches the position in Fig. 8, but instantly thereafter the spring I5I acts to complete the operation of the switch lever I40 to open the switch I20 as in Fig. 9, thus preventing a; premature return ofthe hammer.

Upon the return of the hammer to normal the dog carrying, frame I I5 is returned therewith and the lug I54 engages a finger I50 of the switch lever. I49 to start its return stroke, which return stroke is completed by the spring I5I to'close the switch. Before the closing of the switch I23 is effected,

the arm I04. The usual hammer blocking means,

(not shown) may also be provided to prevent printing during the actuation of the space bar.

To vary the blow of thehammer 26, in accordance with the thickness'of a pack of work-sheets or in accordance with the size of the types of the various shuttles which may be used in the machine, the coil I of the hammer solenoid I20 is settable lengthwise or. axially of the plunger I317. To this end the coil I35 which has secured thereto a flux conducting frame I55 is supported on brackets I55 and I61 by shouldered screws I60 and a screw I69 extending through slots "0 and threaded into the frame I55; the brackets I56 and I61 being secured to the main frame by screws .I1 I.

I11 secured to the main frame. Said rock shaft extends in from the right hand side of the main frame and over the solenoid I20 as in Figs. 3 and 12, and it is provided with a handle H8 at its outer end by which it may be rocked to move the coil I85 either forwardly or rearwardly through the medium of bifurcated arms I19 which embrace studs I on brackets I8I secured to the coil frame I65.

To assist in locating the coil I35 in its various positions the handle I18 is provided with a springpressed plunger I80 (Fig. 3) operable by a finger piece I80, said plunger being adapted to engage in any one of a plurality of apertures I82 (Fig. l) in the main frame. Indication marks I82 may be provided at the holes I82, to designate the variations of the hammer blows.

After each adjustment the coil may be rigidly secured by the screw I69 (Fig. 12) which extends through a slot I83 in the main frame and is provided with a finger piece I84 to thus relieve the setting means from the action of the solenoid while printing.

To feed the ribbon (not shown) by either of the universal bar frames 81 and 88 they are provided respectively with pawls I85 and I86 (Figs. 1, 2 and 3) co-operating with ratchet wheels I81 and I88 secured to a shaft I89 to rotate the latter. The shaft I89 is supported in brackets I90 and is provided with the usual bevel gears I98 and I94 adapted to engage gears I95 and I98 to rotate ribbon spools supporting shafts I91 and I88 to feed the ribbon.

The usual ribbon vibrator 200 (Fig. 6) pivotally supported on fixed studs 20I, may also be operated by either one of the universal frames 81 and 88. To this end the arm IOI, which it will be remembered is secured to the rock shaft 89, the latter being actuable by either universal bar frame, is provided with a resilient arm 202 to engage the lower end of a plunger 203 to push the latter upwardly. Said plunger engages under one of the arms 2 to swing the ribbon vibrator upwardly about its pivot 20I to carry the ribbon into the path of the printing hammer 28.

While certain preferred embodiments of the invention have been shown it should be understood that changes in the form, arrangements, proportions, sizes and details thereof may be made without departing from the scope of the invention as defined in the appended claims.

I claim:

1. In a typewriting machine, the combination of a type hammer, a rotatable type carrier, operable in opposite directions from a central position to select the types, an actuating lever connected to said type carrier, two operating levers to hold the actuating lever in a central position, electro-magnets, means actuable by each electromagnet to operate the actuating lever through the medium of one of the operating levers, one of said magnets and its associated operating lever being effective to actuate the actuating lever and the type carrier in one direction, the other electro-magnet and its associated operating lever being efiective to actuate the actuating lever and the type carrier in the opposite direction, a source of electric power common to both electro-magnets, two sets of key-levers, two switches one associated with each set of keys to be closed upon the actuation of any one of the keys of the associated set to electrically connect the magnet with the source of power, to energize the electro-magnet to actuate the type carrier, and means operable by the key-levers to effect the actuation of the type hammer, and return springs for said operating levers.

2. In a typewriting machine, the combination of a rotatable type carrier operable in opposite directions from a central position to select the types, an actuating lever connected to said type carrier, two electro-magnets, two switches, one for each electro-magnet, two sets of keys, two universal bars one associated with each set of keys to be operated thereby to close the associated switch to effect energization of the associated electro-magnet, a hammer to strike against the type carrier, a return spring for said hammer, an electro-magnet to actuate the hammer against the action of said return spring, a switch whereby energization of the hammer electromagnet may be effected, an element operable by either universal bar to close the last named switch, and a normally closed switch connected in circuit with the hammer electro-magnet, switch opening means, means independent of the hammer and operable by the escapement mechanism to initiate the operation of the switch opening means, said switch opening means continuing to operate after the printing operation of the hammer to open the normally closed switch to effect de-energization of the hammer electromagnet after the printing operation of said hammer to permit said spring to return said hammer to normal after the de-energization of the hammer electro-magnet.

3. In a typewriting machine, the combination of a carriage, escapement mechanism therefor, a rotatable type carrier operable in opposite directions from a central position to select the types, a hammer to co-operate with the type carrier, an actuating lever connected to said type carrier, two electro-magnets, intermediate devices one associated with and actuable by each electromagnet to operate the actuating lever, one of said magnets and its associated device being effective to actuate the type carrier in one direction, the other electro-magnet and its associated device being effective to actuate the type carrier in the opposite direction, a source of electric power common to both electro-magnets, two sets of key-levers, two switches one associated with each set of keys to be closed upon the actuation of any one of the keys of the associated set to electrically connect the magnet with the source of power, to energize the electro-magnet to actuate the type carrier, escapement mechanism for said carriage means operable by the key-levers to actuate the escapement mechanism, an electromagnet to actuate the hammer, and a switch operable by the escapement mechanism whereby the hammer electro-magnet may be electrically connected with the source of power.

4.- In a typewriting machine, the combination of a type shuttle, a hammer to co-operate therewith, a horizontally disposed lever operable in opposite directions to actuate the shuttle, two horizontally disposed arms one at each side of said lever to actuate said lever in opposite directions to carry the desired type to the printing point opposite the hammer, two vertical shafts each having one of said arms secured to its upper end, two sets of key-levers, and means associated with each set of key-levers and connected with the lower end of one of the rock shafts to be actuated thereby and to effect the actuation of the associated shaft to actuate the type shuttle.

5. In a typewriting machine, the combination .of a carriage, escapement mechanism therefor, a

- vers to selectively set the type carrier, a solenoid to actuate the ham'mena source of electric power connectedin a circuit with the solenoid, a normally closed switch in said circuit, a normallyv open switch in said circuit, means operable by the keys to close the open switch after the operation of the shuttle to energize the solenoid to actuate the hammer, means operable by the key levers to initiate the. movement .of the normally closed switch, and means to complete the actuaswitch opening means.

' ing means.

tion of the switch to open it afterthe printing operation to render the solenoid ineffective.

7. In a typewriting machine, the combination ofa type shuttle, Iarresting means therefor, a hammer to co-operate therewith, key levers,

means operable by the key levers to selectively set the type carrier, a solenoid to actuate the hammer, a source of electric 'power'connected in a circuit with the solenoid, a normally closed switch in said circuit, a normally open switch in said circuit, means operable by the key levers to close the open switch after the shuttle is arrested in its printing position to energize the solenoid to actuate the hammer, means independentof the hammer to open the normally closed switch, and means to condition the normally closed switch to be operated upon by the 8. In a typewriting machine, the combination of a type shuttle, a hammer to cosoperate there'- with, an electro-magnet to actuate the hammer,

key-levers, a 1 carriage, carriage escapement mechanism operable by the key levers, a normally open switch, associated with the escapement mechanism which is closed by the operation of the escapement mechanism to effect energization of the electro-magnet to actuate the hammer, a normally closed switch, means to open the closed switch, and means, operable by the escapement mechanism to condition the normally closed switch so that it may be acted upon by its open- 9. In a typewriting machine, the combination of a type shuttle, a hammer to co-operate there- "with, an electro-magnet to actuate the hammer,

key-levers, asource of electric energy, means operable by the key-levers to'connect the electromagnet with a source of electric energyto actuate the hammer, a normally closed switch, a spring to holdwthe last .named switch closed, means operable by the key-levers to partially actuate the switch to change its relation with respect to the spring, and resilient means to keep the switch closed after it is partially operated, said spring being subsequently effective to open the normally closed switch'to de-energ'ize the electro-magnet to permit the return of the hammer to normal.

10. In.a typ ewriting machine, the combination of a type shuttle, a hammer to co-operate therewith;.an e1ectro-magnet to actuate the hammer,

.key levers,' av carriage, carriage escapement mechanism operable by the key-levers, a normal ,ly open switch operable by the escapement.

mechanism to effect energization of the electromagnet' to actuate the hammer, a normally closed switch the opening of which is eflected by the hammer to de-energize the electro-magnet to permit the return of the hammer to normal.

11. Ina typewriting machine, the combination of a typeshuttle, a hammer to co -operate therewith, key-levers, means operable by the key levers to selectively set the type carrier, a solenoid to actuate the hammer, a source of electric power connected in a circuit with the solenoid, a switch in said circuit, means operable by said keys to close said switch, a second switch normally closed in the circuit, means operable by the hammer to initiate the actuation of the normally closed switch, means to complete the actuation of the last named switch to open the circuit,and means 7 to return said hammer to normal.

12. In a typewriting machine, the combination of a type shuttle, a hammer to co-operate therewith, key levers, means operable by the key levers to selectively setthe type carrier, a solenoid.

to actuate the hammer, a source of electric power connected in a circuit with the solenoid, a switch in said circuit, means operable by said keys to close said switch, a second switch normally closed in the circuit, means operable bythe hammer to initiate the actuation of the normally closed switch, means to complete the actuation of the last named switch to open the circuit, and a spring to cock said hammer after the switch is opened 13. In a typewriting machine, the combination of a rotatable type shuttle, a rock shaft, a hammer extending upwardly from said rock shaft and co-operating with said shuttle, anarm extending downwardly from said rock shaft, a sucking coil to actuate said hammer, a plunger in said sucking coil and connected to the downwardly extending arm, said coil and said plunger extending fore and aft of the machine, a frame on said coil, fixed guides with which said frame cooperates, a rock shaft extending transversely of the machine, a finger. piece on said rock shaft by which it may be rotated, and an arm on said I rock shaft to move the coil back or forth on its guides to vary its eifect on the plungerto vary said key levers to actuate the escapement mechanism, and a switch operable by the escapement mechanism to effect the actuation of the electrical means to operate the printing hammer.

15. In a typewritingmachine, the combination oi' a carriage, a type carrier, a hammer to cooperate therewith, electric means .to actuate said hammer, escapement mechanism for said carriage, key levers, a universal bar operable by said key levers to actuate the escapement mechanism,- a switch operable by the escapement mechanism to eiitectv the actuation of the electric means to operate the printing hammer, and a second switch controlled by the escapement mechanism to render the electric means ineffec-'- of a, carriage, a type carrier, ahammer .to co-' operate therewith, electric means to actuate said hammer, escapement mechanism for said carcarriage, key levers, a universal bar operable by I -on, a hammer to co-operate with said type carriage, key levers, a universal bar operable by said key levers to actuate the escapement mechanism, a switch operable by the escapement mechanism to eiiect' theactuation of the electrical means to operate the printing hammer, a second switch controlled by the escapement mechanism to render the electric means ineffective, means to restore the printing hammer to normal position, and means connecting the hammer and the "escapement mechanism to assist in restoring the escapement mechanism to normal.

1'7. In a typewriting machine, the combination of a carriage, an escapement therefor, carriage propelling means, printing-instrumentalities including two elements, namely a hammer and a type shuttle, key levers, means independent of the escapement to drive one of said elements against the other, means operable by the keylevers to eifect the actuation of driving means, means independent of the escapement mechanism to return the operable element to normal, and means connecting the operable elethe returning means may assist the return of the escapement mechanism to normal.

18. In a typewriting machine, the combination of printing instrumentalities including two elements, namely a type carrier and an element to co-operate therewith, one of said elements being operable towards the other, key levers, an elec trical device'to actuate the operable element, a normally open switch under the control of the key levers to eilect the actuation of the electrical device, a normally closed switch, and means ac tuable by the operable element of the printing instrumentalities whereby the normally closed switch is opened after the printing operation is completed and whereby the normally closed switch is held open, the operable element being effective on its return to open the normally open switch and again actuate the last mentioned means to eifect the closing of the normally closed switch after the other switch is opened.

19. In a typewriting machine, the combination of a main frame, a rotatable type carrier thereon, a hammer to co-operate with said type carrier, a solenoid to actuate said hammer and located at the interior of the machine, said solenoid including a coil and a plunger operating .therein and connected with said hammer, means to support the coil on said main frame, and means supported on the main frame and including a finger piece at the exterior of the machine, said means extending into the machine and connected to said coil to adjust the latter on the supporting means and lengthwise of the plunger to vary the force of .the solenoid and thus vary the blow of the hammer..

20. In a typewriting machine, the combination of a main frame, a rotatable type carrier thererier, a solenoid located under said hammer to actuate the latter, said solenoid comprising a coil and a plunger operating therein, means to support said coil on said main frame, said plunger being connected with said hammer, hammer actuating means operable by said plunger, and

means supported on the main frame and including a finger piece located at the exterior of the machine, said means being settable to a plurality of positions and connected to said coil to adjust the latter on its support lengthwise of the plunger to vary its effect on said plunger and the hammer actuating means to thus vary the blow of the hammer. y

,rock shaft and co-operating with said shuttle, a

sucking coil to actuate said hammer and located thereunder, means to support said coil on the main frame, a plunger in said sucking coil, an arm extending downwardly from said rock shaft and connected to said plunger, and means extending from the exterior of the machine to said coil to set it to various positions on the supporting means to vary the position of the coil axially of and relatively to the plunger to vary the efiect of the coil on said plunger and thus vary the blow of the hammer. J

22. In a typewriting machine, the combination of a carriage, escapement mechanism therefor, a settable type carrier, two sets of key-levers, two universal bar frames one for each set of keylevers to eiIect the actuation of the type carrier in opposite directions from a home position, the universal bar frames being operable by theirassociated key-levers, a lever operable by either universal bar frame to actuate the escapement mechanism, a hammer to cooperate with the type carrier, means to actuate the hammer, and means operable by the escapement to eifect the actuation of said hammer actuating means.

23. In a typewriting machine, the combination of a carriage, escapement mechanism therefor, printing instrumentalities including key levers, a universal bar operable by the key levers to actuate the escapement, an electric device, a switch the operation of which is effected by the escapement mechanism upon each actuation of the latter to thus effect the actuation of. the electric device, means operable by the electric device to assist the actuation of the escapement mechanism from its normal position, means to render the electric device ineffective while the escapement is out of its normal position, and means to return the operable means to assist in restoring the escapement mechanism to its normal position.

24. In a typewriting machine, the combination of a carriage, escapement mechanism therefor, printing instrumentalities including two elements, namely a type carrier and an element to co.-operate therewith, one of said elements being operable towards the other to print, key levers, means operable by the key levers to selectively set the type carrier, an electro-magnet to actuate the operable element, a source of electric power connected in a circuit with theelectromagnet, a switch in said circuit and associated with the escapement mechanism, and means operable by said key levers to actuate the escapement mechanism to close said switch.

25. In a typewriting machine, the combination of a carriage, escapement mechanism therefor, printing instrumentalities including two ele ments, namely a type carrier and an element to cooperate therewith, one of said elements being operable towards the other to print, electric means to actuate the operable element, key levers, a universal bar operable by said key levers to actuate said escapement mechanism, and a Oo-operate therewith, one of said elements beingoperable towards the other to print, electricmeans to actuate .the operable element, key levers, a universal bar operable by said key levers to actuate said escapement mechanism, a. switch operable by the escapement mechanism to effect the actuation of the electric meansto actuate the operable element, and a second switch controlled 'by the escapement mechanism to render the elec-.

tric means ineffective so that the operable element may be retumed to normal. 7 27. In a typewriting machine, the combination of printing instmmentalities including two elements, namely a type carrier and element to! co-operate therewith, one of said elements being operable towards the other to print, a solenoid including a coil and a plunger, means connecting-said plunger with the operable element, a fixed bracket to support said coil, a rock shaft, one end of said shaft being connected to the coil, and indexing means connected-to the other end 'ofthe coil to move the coil on said bracket at will to adjust it relatively to said plunger to vary the 10 force of the solenoid.

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