US1667773A - Typewriting machine - Google Patents

Typewriting machine Download PDF

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Publication number
US1667773A
US1667773A US87874A US8787426A US1667773A US 1667773 A US1667773 A US 1667773A US 87874 A US87874 A US 87874A US 8787426 A US8787426 A US 8787426A US 1667773 A US1667773 A US 1667773A
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United States
Prior art keywords
lever
type
bar
type bar
spring
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Expired - Lifetime
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US87874A
Inventor
Gustave O Degener
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Royal Typewriter Co Inc
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Royal Typewriter Co Inc
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Application filed by Royal Typewriter Co Inc filed Critical Royal Typewriter Co Inc
Priority to US87874A priority Critical patent/US1667773A/en
Priority claimed from GB2270727A external-priority patent/GB303188A/en
Application granted granted Critical
Publication of US1667773A publication Critical patent/US1667773A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41JTYPEWRITERS; SELECTIVE PRINTING MECHANISMS, e.g. INK-JET PRINTERS, THERMAL PRINTERS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J23/00Power drives for actions or mechanisms
    • B41J23/02Mechanical power drives
    • B41J23/12Mechanism driven by cams engaging rotating roller

Description

G. O. DEGENER "TYPEWRITING MACHINE May 1,
" Filed EebLlZ. 1926 4'Sheets-S heet 2 /m e/7/0r 0.17 e gerwh May 1, 1928.
.6. o. DEGENER TYREWRITILNG MACHINE Y Filed Feb-.12. 1926 4"sheets-sheep5 I //7Vem0r G: QDegeneP v b his Aft May 1, 1928. 1,667,773
G. o. DEGENER 3 TYPEWRITING MACHINE Filed Feb. 12, 1926 4 Sheets-Sheet 4 Gfape geher 7/7 vemor Patented May 1,'1928.
T'UNITED STATES G-USTAVE DEGENER, OEZBROOKLYN, NEwYoRx, nssrenon 'rov ROYAL TYPEWBI'JJEB COM A Y,- rim, on NEW roan, 1v. Y., A CORPORATION or NEW YORK.
Thi -invention relates to a' typewriting machinein which the type bars'are moved to the printing point by means of individual.
springs. Latch mechanism isprovided for holding each type bar in its rest position I against the tension of said-spring and'the key lever needbe depressed merely far enough to release this latch mechanism. The
by anelectric motor. When the machine is not. in use the electric motor 15 not running,
bu'tis" started by the depression of the first key struck. If subsequent keys are struck within predetermined intervals, the motor will run constantly so long as writing is be- Y mg performed. If at any time the writing ceasesfor such predetermined intervals,'the
circuit is automatically broken and the motor stops. 1 1 The lnvention also comprises var ous detail improvements in a machine of this character which will be pointed out hereinafter and covered by the appended claims.
vIn the drawings:
Figure 1 is a fore and aftsection through.
a typewriting machine embodying the invention with parts shown in elevation. Figure .2 is a rear view.
Figure 3 is a front view of the means for I preventing a depression of more than one key atfia time, with key levers in section and parts broken away. v
Figure 4; is a diagrammatic view of the circuit including the motor and the automatic switch mechanism.
tion showing the type bar in its operated position.
Figure 6 1s a-similar view'showing the Figure 5 is a side elevation of a type acry rnwmrmemcnmn.
Application filed February 12,1926, Serial No. 87,874.:
mechanism with parts in section and parts I broken away. i j
Figure 9 is a side elevation of the switch mechanism. I I
Figure 10 is a section on the line 1010 of Figure 8. I
Figure 11 is a section on'l in .1 1 '11 of Figure 8.
v Figure 12 is a view similar to Figure 8- but showing the parts in a different position.
The construction comprising-the invention may be applied to typewriting machines of,
widely differing character but isillustrated herein asa'pplied to the usual Royal machine. There is disclosed a machine frame A, carriage B supporting the usual platen C and controlled in. its usual step -by-step movement by' escapement mechanism comprising v a ratchet wheel D controlled by the usual escapement .dogs E. All these parts as wellv as the various otherinstrumentalities of the machine may beof any usual or desired character.
Mounted in the frame A is a cross bar 1 which supports a shaft 2 on which are mounted a plurality of key levers 3 arranged in the usual banks and provided'with finger keys 4. Each key lever has an upwardly extending arm 5 to which is pivoted at 6 two latch members 7 and 8. Thelatch member 7 is provided intermediate its ends? drawn toward each other by a coil spring 11 fast at its ends to the two members. The type bar 12 is pivoted at 13 in the usual type bar segment or in any desired manner. The head 14 normally lies adjacent a type bar rest 15 and at times contacts therewith. Adjacent the head 14 of the type bar each bar is, provided with a bent over ear 16 with which cooperates a hook 17 formed on the latch member 7 and a hook 18 formed on the latch member 8. As clearly shown in Fig. 5, these hooks lie in different planes, for a purpose hereinafter set forth.
- Y The heel of each typebar is provided with a slot 19 having an enlarged portion 20 and fitting in said slot 19 is apin 21 carried by a sub-lever 22 which is pivoted on a sha each sub-lever 22 and is pivoted at 25'to the upper end 26 of a bell crank lever pivoted on a shaft 27 carried by the side frame of the machine. The other arm 28 of the bell crank lever is provided with a plurality of holes 29. in one of which is located a spring 30 which is attached at its other end to a plate 31 carried bya rock shaft 32. This 0 'strip of composition fabric 56 spirally rock shaft is provided with a worm gear 33 with which meshes a worm 34 on a short shaft 35 mounted in a bracket 36 and provided with a thumb screw 37.- By turning this thumb screw 37 the shaft 32 may be rotated in one direction or the other and thereby the springs 30 may be simultaneously adjusted to givethem the desired tension.
Each sub-lever 22 is' provided with a forwardly extending arm 38 which is guided in a comb guide 39 carried by the cross bar 1. Each key lever has a rearward extension 40 provided with a bent over end 40 which is adapted to ride on the upper surface 41 Figure 5. This will prevent the return of the actuated key lever to normal position until the type bar has been moved a considerable distance toward its rest position and since only one key lever can be depressed at a time it is obvious that a secondkeylever cannot be depressed until the type bar has moved toward its normal position far enough to avoid any interferencewith a subsequently actuated type bar.
Pivotally carried by the arm 26- of each bell crank lever at 42 is a cam member 43. This cam member is adapted to be engaged when a type bar has been operated by a constantl rotating shaft 44 driven by the motor G an operating as hereinafter set forth.
Carried by a cross bar 45 supported in the machine frame, are brackets 46 which support a transverse member 47 provided with an opening 48 therein, in which are mounted a plurality of balls or rollers 49. As clearly shown in Fig. 3 the space in the opening 48 is merely sufficient to allow one key lever-to be moved down between two adjacent balls or rollers displacing the others to each side.-
While this key lever is in depressed posi-' tion no other key lever can be depressed, since the balls cannot separate farv enough to allow its passage. Each key lever is pro vided with an extension 50 which passes down between the balls and this extension is' each cam member 43 is engaged by one of these springs 52 when in idle position in order to prevent overthrow of said cam member oraccidental displacement thereof.
Each connecting link 24 is provided with esa-me a projection 53 which is adapted tocoopcrate with a'plate 54 SUPPOItBdfIOIIl-fl rock shaft 55 carried by theiframe and an arm projecting from this plate engages the dog rocker so that each time one of the links 53 is moved forward the escap'ement mechanism will be operated in the usual manner.
The driving shaft 44 is covered with a wrapped around the shaft and fastened, at each end. The shaft is also provided with aworm'57 which meshes with a-worm gear 58 on a shaft 59 which supportsthe usual centrifugalgovernor 60; On this shaft may also be mounted a drum 61 for use with carriage return-mechanism if desired. 1
Whenever a key 4 is depressed the upper extension 5 ofthe key lever will move the latch member 7 through its ear 9 and thereby release the book 17 from the ear 16 of the type bar. The spring 30 will then rock the bell crank lever. on its shaft 27, pushing forward the link 24 and turning the sublever 22 about its shaft 23. By means of the pin and slot connection the type bar will be positively moved to the full line position shown in Figure 5. At this time the cam 43 carried by the bell crank lever will come in contact withthe power shaft 44 and pre ventfurther forward movement of the link 24 and sub-lever 22. The enlarged portion 20 of the slot 19 will, however, permit the type bar to complete its printing-movement by momentum, moving to the dotted lineeach other atexactly the moment that the type bar has been movedto Its printing position by the pin 21 acting in the slotl9. By enlarging the 'slot at its end and allowing the type bar to complete its movement by momentum there is no necessity for accurate adjustment of the pin and slot.
The power shaft 44 is either running or is' started upon a depression of a key. As soon as the cam 43 engages the power shaft as shown in Figure 5, the rotation of the shaft in the direction of the arrow'will' cause the ice cam to rotate in the direction shown by the arrowand since the distance from the pe riphery of the cam to its pivot point increases, continued rotation of the cam will bring the parts to the position shown in Figure 6 and positively return the type bar to a position wherein the ear 16 will be engaged by one or other of the lugs 17 or 18. In the position of the parts shown in Figure 6 it is assumed that the key .has not been released and in .this case the depression of the key is holding the latch 17 out of position to engage the earor lug 16. However, at this time the latch 18 will engage the lug I stud 7 0 provided with a bushing upon whic released. If the key is now released the latch members 7 and 8 will both move slightly to the rear and the hook 18 willrelease the lug 16 on the type bar but at the same time the hook 17 will move into a position to engage the same. It is for this reason that the hooks17 and 18 lie in diflerent horizontal planes. I
Each successive actuation of a key lever will result in the same sequence of movements. The force with which the type bar' strikes the platen can be adjusted by ad j usting the tension of the springs 36 as above described. Since the bell crank lever and;
cam member 43 are returned quickly ateach' time as the cam 43-.is rotating, it is desirable to provide the spring .brake members 52 which will engage the cam at this time and prevent overthrow thereof.
As above stated, the motor is normally at rest because the circuit is broken by an automatic switch mechanism'butis started by a depression of the firstkey operated. .If subsequent keys aredepressed with the usual speed, or' within predetermined intervals of about three seconds, in the construction illustrated the motor will run constantly and the power shaft 44' will have a regular movement controlled by the governor 60. If, however, the operation of the keys is $1137 pended for an interval greater than that predetermined, the circuit will again be broken and the motor will stop. The mechanism by which this result is attained will.
now be described. p 1
In a casing 62 is mounted a pivot stud 63 on which is pivoted a generally U-shaped member 64 having a short arm-65 and along arm or lever 66. A spring 67 is coiled about the stud 6 3 and engages the member 64 at one end, while its other end is held against movement by engagement with a pin 68 car ried by the casing. This spring tends at all times to move the member 64 from the position shown in Figure 8 to that shown in Figure 12.- The lever 66 has an enlarged central portion provided with an opening 69 and passing through'this opening is a is rotatably mounted a worm gear 71. A
ber 64 is an insulating lever72 is pivoted at 73 in the, casing and is normally held in rest position by a spring .74, one end of which engages such lever and the other end of which is fastened to the casing by a screw 7 This lever has a tooth or shoulder 76.which. as shown in dotted lines in Figure 8, normally engages the lower end of the lever'66 and holds the parts in the Figure 8 position, preventing their movement to the Figure 12 position to which the spring 67 tends'to move the same.
Mounted in the short arm 65 of the memblock 77 to which is h plate-101.
fastened by screws 78 along spring 80, one
3 of said screws also serving as a binding post for one of the circuit wires 79. A short shaft the drive-shaft 44. Obviously "when the parts are in the Figure 8 position a rotation of the drive shaft will also rotate the shaft 81 and turn the worm gear 71 .by means of the worm 82. The other end v offishaft 81 passes through an opening 86 in the side of the casing and its reduced end 87"islsupported in a lever 88 carried 'by"'af-shaft'89 supported in a bracket 90; This levler88 has a bent over arm '91 which overlies the lever 92 pivoted at 93 to the casing '62 and at its free end overlying the lever 72. The spring 94 attached at one end to the lever 88 and at its other endtoa pin 95 carried by the casing62, tends to hold the parts 54 is moved through engagement of a projection 53' on the link 24 the shaft 89 will be rocked, moving the free end of the lever ,88 downward in Figure 9- and also moving the lever 92 and the free end of the lever 72.. The movement downward of the lever 88 will move downward that end of the shaft 81and therefore move the Worm 82 out of engagement with the worm gear71, as shown in Figure 12. At the same time, the downward movement of the lever 72 against the tension of the spring 74will move the hook or'detent portion 7 6' downward out of the path of, the end of the lever 66, thereby allowing thespring 67 to move this lever as well as the spring 80 to the Figure 12 position.
Attached to a Wall of the casing is a block of insulating material, upon which rests the plate 101 which is thereby insulated from the'casing. A binding screw 102 connects the other terminal 108 of the circuit to the This plate has an upstanding member ,104 onaone side'of which is a block 105 of insulating material. At one side of the plate101 is an ear 106 to which is'attached a bent spring 107, while the other side of the-plate has asimilar car 109 to which is,. ht tached a spring. 110. The free ends of these springsare positioned as clearly'shown iniFig. 10 so that they lie on opposite sides of'the member 104 and one spring is in contact with the insulating member 105. Attached to the levers 66 by pivot 111 is a member 112, the free end of which is normally forced against a pin 113 by means of a spring 114. Thisratchet member has a tooth or detent 115 which is adapted to be engaged by a pin 116 on the worm gear, as
I hereinafter described.
VVhen' the parts are in theFigure 8 posltion, thecn'cuit is broken since the spring 80 is in contact with the insulatingfiblock- 105, as shown in Figure 10, and the motor is I at rest. When a key is depressed, the parts moveto the Figure 12 position, as previously described, In this movement of the spring I mentwill bring the spring 80 to the position a of Figure 10..- At this time the parts arein the Figure 12 position andtlle worm 82 is'out of contact with the worm gear 71. As soon as the gear lever is released the springs and 94will return the parts to the Figure 9 position, bringing the Worm .82 into mesh with theworm gear 71. Since the motor has "-now been started the power-shaft'44 is rotat- 3. 66 l nd move this lever together? with the TariiiQ65 and spring 80 toward the right 111 2 80 will pass through the position b and to I the position a, the circuit being closed during thistime. When the'member 64 has moved U sitio niof Figure 10,'contacting with the inf-"f -ing and constantly the shaft 81 willalso-1o tate. This will turn the worm gear 71 in a counter clock-wise position looking. at Fig-. ore-12 and during this movement the pin 116 'will contact with the latch 115 on the lever Figures and 12. The end of the spring thisiar to the right, the pin-116 will slide lofi Ith e det'ent llfi-and the spring 80 will move from the position 0 to the. full line p'osnlating block and breaking the circuit;
This complete operation in the embodiment shown, will take about three seconds and if a subsequent key has not been pressed in that interval, the circuit will be broken and the motor will stop. It is obvious, however, that ifzasubsequent-key is depressed before the 65 tained in this position even if the operated parts have completed thismovement that the end of the shaft 81 will again be; moved downward breaking the connection between the worm 8 2 and theworm gear 71 and allowing themember 64 including the lever 66 and the spring 80 to move. once more to the Figure; 12 position, again closing the-circuit. If the keys are rapidly depressed the lever willremain practically in this position all of the time and the worm and worln gear will not engage long enough to produce any appreciable movement of the spring toward the right 111 Figure 12.
It is obvious that the foregoingconstruc-,
tion provides means whereby the type bar may be. moved to spring, the tension of which and consequent t the force of the blow, can be regulated.
The type-bar can also be returned to normal,
position by power means and will be re-' printing printing position by a key lever has not been released. Since it is impossible to depress more than one key lever at a time and since even if the first key lever is released a second cannot be depressed until the type bar has completed an appreciable portion of its return movement, it is remainconstantly running at a speed regu- 'lated by the governor. If, however, the operation of-"the'machine is discontinued for any appreciable interval, the circuit will be automatically broken and the motor comes to rest. The same operation which breaks the circuit will, however, bring the parts to such position that a subsequent operation of a key will again bring about the closing of a-circuit and motor. I
It is obvious that very many detail changes can be made in the precise construction embodying the invention without in anyway departing from the spirit thereof which is to be regarded as limited only by the scope of the appended claims.
1 claim: 1 r '1. In a typewriting machine, the combination of a type bar, means constantly tending to move'said type bar to printing posimeans for returning the typ'e bar to rest position. i
2. In a typewriting machine, tlie combina tibn of a type bar, means constantly tending to move said type bar to printing position,
the consequent starting of the meansdirect-ly engaging said type'bar to" hold it against movement, means for releasing said engaging means, ppw'er' means for returning the type barto rest position, and a second, means'operative to hold the type bar in said, rest, position until the engagingmean's" returns to normal position.
3.1; In a typewrting machine, the combination ofa type bar having a projection, means constantly tending to move said type bar to osition, a detent engaging said projection to hold the bar against movement, means for releasing said detent, power means for returning the type bar to rest position, and asecond 'detent-to engage said projection so longv as the first is held in in- ..operative position. j
4. In a typeuriting'mac-hine, the combination of a'type bar having aprojection, means constantly tending to move said type bar to printing position, a key lever; a detent on said key lever engaging saidproject-ion to hold the type bar against movement, means for releasing said detent by movement of the key, nd power means for retur i the yp ar to rest ositi v 5. In a typewriting machine, the combination of atypebar having a projection, means constantly tending to move said type bar to pr nting position, a key lever, a detent on saidlkey lever engaging said projection to i hold the type baragainst movement, means said key lever adapted to engage said pro;
jection and hold the type bar in rest position until the first detent returns to operative position.
6. In a typewrlting machine, the combina tion of a type bar, means constantly tending to move said type bar toprinting position,
. when thekey lever is in normal position, and
'd key the return of an.actuated key lever until a key lever, two detents pivoted thereon, onedetent being adapted to hold the type bar the other when the key lever is in operate position. l
,7. In a typewriting machine, the combination of a type bar, means constantly tending to move said ty e bar 'to rintin sition p p a PO bination ofa typebar, a spring constantly power meansiorlreturning the type bar to pivoted thereon, so.
l bination of atype bar, means I tending to move sa d typebar printing position, and connectionsbetweenpaidmeans.
rest ;'position"," a Jke lever, 1 two detents hold the type 'ba r," against-movement when the key lever'isin'normal position and the i other when the type bar has been" returned before the key lever returns to normal position. 8. In a typewriting maghine, the combination of a type bar,,m'eans constantly-tending to move saidtype' bar to printing position and connections "between "said; means an type aiincluding ajpin and slot,i*said slot type bar including a sub-lever, a pinthereon,
and a slotin theheel of thetype ban-said wide at one end to permit the; to perform the latter part of its.r-f tween sald spring movement through momentu h sub-lever'having p111 and slot connection the type bar, a'bell crank lever .to which said spring :is. connected, and an adjustable sublever and bell crank slot being type bar printing alone. p m,
10. 11m typewriting machine-jibe" com-' cpnstantly and type barin'cluding a sub-lever haying a pin and type bar, means for limiting themovement of the sublever, ,and the slotbein'g-wide at one end to perm-it' the type, bar to perform the latter-part of its printing movemenfi by momentum alone. j 11. In a typewriting machine, the combination of. ,a type bar, means constantly tending to move said type bar to printing etent'beingadapted' to j tween saidsprmg and type bar including a bar ' sub-lever engaging the type bar,
, f 16. In a typewrit'rng machine, nation of a type b slot connectionwithrthe heel ofthe" 'pos1t10n, and intermediate connections between said spring and type bar including a position, and connections between said means and type bar including a sub-lever having a lost motion. connection with the heel of the type bar, means for limiting the movement of the sublever,' and a comb guide for the same. 5 v
' 12. In a typewrrtingbmachine, the com- 'while the intermediate member is in fully operated position.
13..'I n aty'pewriting bination of type ars, means tendingto move said t pe bars to printing position, a plurality, of ey levers, means for preventing thedepres'sion of more than one lever at'a -time,,and means preventing the'connected type bar'has partly returned towardnormal position."
14. In a typewrit'ng machine, the comtending to position, and intermediate connections besub-lever engaging the type bar, a bell crank lever-to which. said spring is connected, and a link connecting said'sub lever and bell ,crank lever; I v-15. In a typewriting machine, the combinationof a type bar, a spring constantly position, and intermediate connections beincluding a tween said s rin 'and t pe bar p a y a bell crank leverto'which'said spring is connected, a
' link connecting said sub-lever and bell crank machine, the com- I constantly,
move said 'type'barfto printing jtending to'move 'sald typebar to printing leveryand means for limiting the movement of the bell crank lever. v the combiand inter-mediate connections belink connecting said lever;
Y -17. Inia typewriting machine, the combination ofatype'bar, a spring. constantly tending to 'move said type bar to printing sub-lever having pin and slot connection with thetype bar, bell crank lever to which said spring'is connected, an adjustable link of the bell crank lever.
ar, a spring constantly tending to .move'said type bar to printmg 18. In a'typewritingmachine embodying type bars and means for moving said type bars to printing position, means for returning the type bars to rest position comprising a rotatable shaft, a motor for driving said shaft, and means for maintaining said motor. In operation so long as the interval between the. return of one type bar to normal and the operation of the next lies Within a predetermined limit.
I operation of the next lies within a predetermined limit, and means for stopping the. motor'when the interval exceeds said limit. 20. In a typewritingmachine embodying "type bars and means for moving said type bars to printing position; means for return ing the type'bars' to rest position comprising a motor, means'for starting said motor, and
' amians for maintaining said. motor in. oper .30 mined limit.
ation so long as the. intervalbetween the return of one type bar to normal-and the operation of theznexti lies within a predeter- 21.- In a typewriting machine embodying 1 type bars and means-for moving said type I bars to printing position; means for returning the type bars to rest position comprising a motor, means for starting, saidmotor by the operation of a type barfaiid means .for
"maintaining said motor in operation solon gas the interval between ,the return of one r type bar to normal and the operation ofthe next swi hi'n a predetermined limit. Inna yp ri ing machine embodying type bars and means for movingCsaid typebars to printing position means ffgr return mg the type bars to rest positioncogiprising a -'m0tor,'means for starting said motor by the operation of a type bar, means foii kmain taimng said motor in operation'solongras f the interval between. the return of one typebar to normal and the operation of the nextlies with in a predetermii edlineit, and means for stopping said motor"when",the interval exceeds said limit.
type bars and ni'eans -for moving sai'drbars to printing position;- means for returning. I
the type bars to rest position comprising an electric motor included in a normally open circuit, means for closing said-circuit, and
'terval b scribed myname.
means for maintaining said circuit closed so long as the interval between the return of one type bar to normal and the operation of the next lies Within a predetermined limit.
24'. In aztypewriti ig machine embodying type bars and means for moving said bars to printing position; means for returning the type bars to rest position comprising an electricr m otor included in 'a normally open cir-. cuit, means fonclosing said circuit by the operation ofIa-type bar, and means for maintaining said circuit'closed so long as the in. etWeen'th-e return of one type bar to nornia ndthe operation oftlie next lies within a predetermined limit. a
. 25. Ina typewriting machine embodying J type bars'and means for moving said bars to printing position;- means for returning the type bars to rest positionroinprisinganelec- ;tr-ic motor, included in a normally open circuit, means ,for closing said .circuit'by the operation of a type bar, means for maintaming said circuit closed so long as the into normal and the operation of the nextlies 'terval between the return of onetype bar.
Within a predetermined limit, and means for stopping said motor when the interval exceeds'said limit.
26. In a typeivriting machine embodying type'bars, means for moving said barsto printing position, escap'ement mechanism 275 In a typewriti iig maehine embodying type barsyni'eans for ,moving said bars to printing position, escapement 'mechanism chided in a normally open circuit and means v I for, closing said cirruit operated by inovem ent of theuniversal bar.
28. In a type vriting machine, the combiv nation of a type-bar, means for moving said type bar ',;tb; printingposition, and connec=- tionsbetiveen said means and type bar in-; clndimg' a;pin and slot, said pin' and slot havging close engagement during the" reater part of the movement of the type barjoiit theslot w being -wider at one end to permit the type 23. Ina typeWriting-machin embodying ganda universal bar for operating the same;
..-.inean for returning the type bars-torest p'ositi comprising an electric-motor 1n-' bar tojperform" the latter-part o tits printingi-movem'ent "througlrmomentum alone.
.Initestnnoniy whereof, I have hereunto sub- Gosravn o. nnennnn.
US87874A 1926-02-12 1926-02-12 Typewriting machine Expired - Lifetime US1667773A (en)

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US87874A US1667773A (en) 1926-02-12 1926-02-12 Typewriting machine
GB2270727A GB303188A (en) 1926-02-12 1927-08-29 Improvements in power operated typewriting machines
FR640399D FR640399A (en) 1926-02-12 1927-09-03 Improvements in typewriters

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2424377A (en) * 1946-08-28 1947-07-22 James P Wesley Spring-powered key action
US2602529A (en) * 1949-06-16 1952-07-08 Ibm Automatic cutoff switch for typewriters
US2919781A (en) * 1956-09-08 1960-01-05 Olympia Werke Ag Control mechanism for the motor of an electric typewriter
US3330398A (en) * 1965-09-13 1967-07-11 Burroughs Corp Printing head control allowing head to strike in free flight and be positively retracted
US3373857A (en) * 1966-03-29 1968-03-19 Litton Business Systems Inc Mechanism for power operating type actions both to and from the printing point

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2424377A (en) * 1946-08-28 1947-07-22 James P Wesley Spring-powered key action
US2602529A (en) * 1949-06-16 1952-07-08 Ibm Automatic cutoff switch for typewriters
US2919781A (en) * 1956-09-08 1960-01-05 Olympia Werke Ag Control mechanism for the motor of an electric typewriter
US3330398A (en) * 1965-09-13 1967-07-11 Burroughs Corp Printing head control allowing head to strike in free flight and be positively retracted
US3373857A (en) * 1966-03-29 1968-03-19 Litton Business Systems Inc Mechanism for power operating type actions both to and from the printing point

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