US2362229A

US2362229A - Typewriting machine

Info

Publication number: US2362229A
Application number: US470868A
Authority: US
Inventors: Harry C Yaeger
Original assignee: Underwood Elliott Fisher Co
Current assignee: Underwood Elliott Fisher Co
Priority date: 1942-12-31
Filing date: 1942-12-31
Publication date: 1944-11-07
Anticipated expiration: 1961-11-07

Description

H. c. YAEGER 2,362,229 TYPEWRITING MACHINE Filed Dec. 31, 1942 Nov. 7, 1944.

4 Sheets-Sheet l mvzmoa Haz'cy 8. yaeyez ATTORNEY Nov. 7, 1944. H. c. YAEGER TYPEWRITING MACHINE 4 Sheets-Sheet 2 Filed Dec. 31, 1942 INVENTOR 71km 6. ya

eyet

ATTOR'NEY 1 I In: I \Q- i Q Nov. 7, 1944. H. c YAEGER 2,362,229

TYPEVIRITING MACHINE Fiied Dec. 31, 1942 4 Sheets-Sheet 3 INVENTOR E? Y Hazy @yaeyez BY Nov. 7, 1944. c; YAEGER I 2,362,229

TYPEWRI TING MACHINE Filed Dec 51, 1942 4 Sheets-Sheet 4 INVENTOR are] C. yae et a Patented Nov. 7, 1944 Harry G. Yaezer, West Hartford, Coma, assimor to Underwood Elliott Fisher Company,- New York, N. Y., a corporation of Delaware Application December 31,- 1942, Serial No. 470,868

10 Claims, '(Cl.'197-'-17) This invention relates to typewriting machines embodying power typinga'nd power carriage returning instrumentalities, and'with regard to certain more specific features thereof, to devices preventing power typing at line ends. and also to devices preventing typing and certain other operatlons during carriage returns.

' The stroke of the type keys in power typing machines is preferably very short and the touch is light. Furthermore, the release of the type keys is independent of the return of the typing instrumentalities, so that an operated type key is apt to be held depressed while another one is being operated. For the above and other reasons, the conventional key lever line end locks the last-mentioned object in such manner that the type keys are normally freely operable, that is. without any encumbrance to the touch of the type keys.

Also, an object is to contrive efiicient and reliably operative means to prevent power typing and. other operations during carriage returns, such devices being of a nature allowing the type keys used in manually operated typewriters are un- In the machine of the present invention, the

type actions are actuated by individual actuating mechanisms which are selectively power-operable under control oi type keys. After giving a typing impulse to its associated type action, each actusting mechanism retums to its" normal position independently of whether'or not the associated type key has been released. In association with typing instnentalities of this kind, it is a lurther object oi the invention to provide reliably operative devices which unfailingly prevent power operation of the actuating mechanisms in ,response to a certain line-end carriage-feed-movement, despite the fact that the last operated-type key, operation of which resulted in the line end carriacc-iced-movenlent, may be lingered upon by the typlst.

Also, an object of the invention is to provide, in combination with power typing instrumentallties. means to prevent, in an emcient lnanmlr, typing and other operations during power carriagene turns.

Another object is to provide simple, unlailinsly eflective, devices to prevent power typinc subsequent to the ieeding of the carriage beyond a certain line end position, and to prevent power typins,-and such operations as back spacing, while the carriage is being returned.

It is a iurtherobiect oi the invention to attain to be operated normally without hindrance, and normally turther allowing carriage returns and said other operations to be effected only one after another.

With these and other objects in view, the invention includes certain novel features oi ccnstruction and combination of elements, the elements of which are set forth in the appended claims, and a preferred form or embodiment of which is herematter described with reference to the drawings whichaccompany and form part oi this specification.

- In the accompanying drawings:

Figure 1 is a skeleton front perspective view of certain frame supported elements of a typewrit hm machine, including power typing instrumentallties and a line end loch therefor, and also including certain key controls for leach spacing, tabulating, and other operations, together with an interlocking mechanism therefor.

Figure 2 is a-front perspective view oil a typewriting machine carriage together with a margin stop mechanism and portions oi a power line spacing and carriage returning mechanism. The figure includes some oi the mechanism shown in Figure l and may be conveniently read in corn junction therewith, v

Figure 3 is a sectional side elevation depicting;

a type action as having been partly power actuated and continuing to print by momentum, independently of an already returning power actualing mechanism therefor, the returning power actuating mechanism giving operating clearance I operation,-

mechanism

24, 25 thereupon returns immediately to normal position, whereas the type action proceeds to type by momentum stored therein, and thereafter returns under the tension of its spring 22. Furthermore, an actuator 25, as soon as the pawl 33 is forced clear of the roll 34, will be drawn against the plate 33 by the spring- 28 and will glide to normal position movements in the conventional manner upon a track-way l3 which forms part of the machine frame In. The carriage has opposite end pieces 14 wherein a platen i5 is rotatably supported. A spring motor (not shown) letter-feeds the carriage l2 under control of an escapement mechanism generally designated by the numeral IS, in response to each typing operation, in a manner to be described later.

-The illustrated power typing instrumentalities are substantially the same as shown and described in the Patent to Yaeger No. 2,254,764, dated September 2, 1941, and may comprise a multiplicity of type actions, each comprising a pivoted type bar I! operable by a lever l9 through a connecting link 20, the levers being pivoted on a common straight pivot rod 2| and being normally urged to their normal positions by springs 22. The type-bars are pivotally supported in an arcuate array upon a segment l8 and are movable to strike the platen at a common printing point. Each type action has associated therewith an actuating mechanism 23 comprising, a pendant arm 24 in rolling contact with the lever l8, and an actuating link 25 articulated and extending rearwardly from the arm 24. Springs 26 urge the actuator links, together with their associated arms 24, upwardly and rearwardly, each to occupy normally a position as seen in Fig. 5, the arms 24 being then in motion limiting engagement with a framework cross member 28 in slots 21 whereof the pendant arms 24 are pivotally supported on-a pivot wire 23. At the rear, the actuator links normally contact a horizontal face of an elongate plate 33 having a rearwardly and downwardly bent portion 3| provided with slots 32 wherein the rear ends of the actuator links 25 are guided in vertical fore-and-aft extending planes. Each actuator link 25 has pivoted there- 'on near its rear end a snatch pawl 33 which is adapted to be brought into engagement with a continuously revolving power drive member or snatch roll 34, by drawing the actuator link 25 downwardly about its point of articulation with the pendant arm 24. To efiect such downward drawing of the actuator links, there is associated with each actuator link 25a type-key lever 35 provided with an upright member 38 having a hook end overlying a lug 31 on the actuator link. Preferably, the manner in which the hook members 36 are carried bythe type-key levers is such, that the former may yield upon the latter in a forward as well as in an upward direction for purposes well known. When a snatch pawl has been lowered into engagement with the snatch roll 34, the latter first causes the snatch pawl 33 to revolve llmitedly about its pivot and while remaining in contact with said plate.

The keys 35 pivot about a common fulcrum 'rod 53 which is embedded in a bar 54 of the machine frame, the bar being slotted to accommodate the rear ends of the keys. At the front, the key levers 35 are guided in slots 43 of a comb plate 50, to the upper limits of which slots they are normally urged by springs I55 which are connected to thekey levers slightly in front of the pivot rod 34. When the operated type bar approaches the platen, a universal bar 42, see Fig. 5, is contacted and driven rearwardly to actuate the aforementioned escapement mechanism I8. The connections from the universal bar to the escapement mechanism include a rocker frame 43, and a link 44 connecting the rocker frame with the said escapement mechanism. The latter may consist of a pivoted unit 45 carrying two conventional escapement dogs 43, one of which is normally in engagement with the escapement wheel 4'! and prevents the carriage from moving. The escapement wheel 41 is fixed on an escapement wheel shaft 43 which also has fixed thereon a gear 3| meshing with a carriage supported rack I2. It may thus be understood that the carriage letter-feed in re-- sponse to each operation of the universal bar 42, Just after the type bar I! strikes the platen, and, since the actuator becomes disconnected from the power roll 34 prior, it follows that the carriage letter-feeds always after the restoring elevation of the actuator link 25 against the plate 30, substantially as illustrated in Fig. 3.

The lug 31 on each actuator link, upon the return of the latter, will assume an inoperative position with respect to its hook member as long as the key controlling the hook member is held depressed. More specifically, pending release of the key 33, the lug will idly displace the hook member rearwardly about its pivot pin it by engaging the hook member above its hook face. Upon release of the key, the hook membar will assume its normal operative position over the lug 31.

Word spacing movements of the carriage occur through an actuator similar to the actuators 2|, this actuator being adapted to operate the .which are adiustably locatable margin stops ll,

53 defining, respectively, the limits to which the carriage may be advanced and returned.

Pivoted as at 32, Figs. 1, 4 and 6, to a part of the framework is an upright counterstop arm 84 having normally a stop finger Bl disposed between and in the path of the margin stops ll, 59, said finger projecting through an opening 88 in a horizontal plate 41 secured to a column 68 forming part of the framework Ill. The arm 64 is slotted at its pivotal point 32 so that it may be lowered to dispose the stop finger 43 below the margin stops 3., 33, a spring I2 being provided to cause the arm to pivot normally with the lower end of the slot abutting the pivot pin, the spring being additionally urging the, finger guiding screws I6 supported by the bar.

2,362,229 end 66 against the right end of the opening 66.

During the advanceof the carriage as the carriage approaches the traveling limit as defined by the margin stop 66, the latter engages the finger 66 and causesleftward displacement of the arm 64. This occurs during the last possible letter-feed movement .of the carriage as illustrated in Fig. 4, and causes an actuation of a toothed line-end lock slide I6 to an effective position blocking the actuators 26 against being drawn downwardly into operative relation with the snatch roll 64. The lock slide has teeth 14 which are normally situated between the rear ends of the actuator links 25 and which, upon actuation of the slide, will underlie and block them against being drawn down by the hook members 66. The slide is slidably accommodated on top of. the bar 64 and for this purpose is provided with slots 16 wherein there are headed The arm 64 operates the slide through a yielding connection comprising a lever I1 and an arm 16, both pivoted to the machine framework by a common pin 6|. 1! and the arm I6 toward each other with the arm 64 therebetween. Under normal conditions, the arm 64, when actuated by the margin A spring 62 urges the lever necessary for an understanding of the invention. A preferably continuously operating electric motor 66, disposed at the left rear portion of the machine, see Fig. 1, drives a pinion shaft 61 of which also provides journals for the spindle 9|.

A drum 96 normally free to rotate on the spindle 9|, has a draw band 94 attached thereto in a manner to be wound thereon when the pulley is rotated counterclockwise of Fig. 1. During, use of the machine, the motor 66 rotates the gear 66 and spindle 9| continuously, but the drum 96 remains normally stationary. Said gear 66 has clutch teeth 96, and the drum 93 has splined thereto, in a manner not shown, a toothed clutch collar 96 which is rotatably loose on the spindle 9|, but axially movable thereon from an open clutch position to a position in which it is clutched to the gear 66. A ock shaft 91, Journaled in the casing 92, has fixed thereto a yoke 96 fitting a groove in the clutch collar 96 and an operating arm III, fixed to the shaft 91, serves to rock the latter together with its yoke to move the clutch collar 66 to close and open the clutch. The draw band 64 passes over frame-supported guide pulleys I62, I66, onto a pulley I64 journaled on the left carriage end I4, and has an end so attached and wound around the pulley I64 that rightward pull of the draw band rotates this pulley clockwise. A bevel pinion I66 is fixed to and rotatable together with said pulley I64 and meshes with a gear sector I66 pivoted on the left carriage end I4. Said sector I66 is integral It has been explained that the carriage let- 1 ter-feeds after disengagement of a last-actuated actuator 26, that is, after such actuator has been elevated clear of the power roll 64, into engagement with the plate 66. It will thus be seen that the returning actuator r allows unobstructed movement of the lock slide I6 to effective position, that is, to the position wherein its teeth I4 are posed underneath the rear ends of the actuators 26, see Fig. 3. The clearances between the slide teeth I4 are only slightly wider than the rear ends of the actuator links, wherefore, the teeth I4 will block the actuators 26 practically immediately after the final line-end letterfeeding movement has started. This, it will-be noted; is at the beginning of the retreat of the type bar from the platen, amply before even an untrained typist would be likely to operate the next type key. The lock slide I6, therefore, moves unfailingly to efiective position regardless of whether an operator may linger on a lastoperated key.

Should it be desired to type beyond the mar gin defined by the margin stop 66, the operator may depress a margin release key 66, which, through a lever 64 overlying a pin 66 on the counterstop arm 64, is eflective to lower the latter below the margin stop 66, the finger 66 being then, under the tension of the spring I2 temporarily assuming a position underneath the stop 66. The margin release key 66 may also be used in similar manner to allow movement of the carriage in carriage-return direction beyond the position defined by the carriage return stop 66.

The power mechanism for returning the carriage and line-spacing, as also the controlling mechanism therefore, may be substantially the same as shown and described in the patent to Helmond No. 2,262,676, dated November 11, 1941,

with a cam I6I adapted to actuate through the medium of a roll I69 a spring-returned linespace lever I66 carrying a line-space pawl III, the latter, when actuated, being effective to feed a toothed platen-rotating wheel H2. I Upon a rightward pull of the draw band 94, that is when the clutch member 96 is in engagement with the clutch teeth 96, the gear sector I66 is rotated. limitedly andcauses an actuation of the linespace pawl III. When the-clutch 96, 66 is opened as will be explained hereinafter, a spring H6 returns the sector I66 to normal position against a stop H6 and thereby causes some of the draw band 94 to be wound back onto the pulley I64. To keep the draw band 94 taut at all times, the drum 66 is under constant tension ofa draw band winding spring, not shown, contained in a spring barrel H4 and being lighter than the spring H6.

Connected to the arm I6I by a link H6 is an arm II! of a lever H6, the latter of which is pivoted at Hi to a rear wall of the aforesaid v column 66. The rightward extreme of the arm III, as seen in Fig. l, is normally engaged by a latch I22 which is pivoted to the outer side of the right side wall II of the machine by a headed pin H9. With said lever arm II'I thus latched, a spring H6 is normally restrained from moving the arm lol and closing the carriage return clutch 96, 96. A pivoted, spring-restored carriage-retum key lever I26, when operated by depression of its key, elevates a pin 4 on its rear end and swings the latch I22 free of the right end of the arm Ill, and thus causes closure of the clutch 96, 96 under the urge of the spring H6. The drum 96 being then consequently motor-driven, drives the'carriage-carried pulley I64 so that an actuation of theline spacing mechanism I66, III ensues. After a limited rotav and will now be described briefiy as far as is' The shaft 61 revolves near itsincludes an upright arm I25 to which there is pivoted a transverse link I23, which in turn is pivoted at I21 to another transverse link I28, said links forming a toggle. The link I28 is guided near its left end in a. vertical slot provided in a wall of the column 38 and rests upon a. lugor shelf I3I. The link I28 has a stud I32 passing into a slot I33 of a link I34 connecting the counter-stop arm 84 with the link I28, the link I34 leaving the arm 64 always free to be moved downwardly under the control of said margin release key 83.

Assuming the carriage I2 to be in an inter-- mediate position as shown in Fig. 2, the toggle I23, I28 is almost straight, but upon the release of the lever II8 from the latch I22, the toggle will be flexed upwardly, the stud I32 of the toggle link I28 being then reacting against the left end of the slot I33 in the link I34, but the latter and the counterstop arm 34 remaining unmoved, in substantially the position of. Fig. 2, under the tension of the spring I2. Posed over a nose I33 of the toggle link I23 and being coextensive with the length of the carriage, is a control bar I33, mounted for downward diagonal movement on the carriage, against the tension of a spring I31, the bar being provided at opposite ends with diagonal slots I38, whereinto there extend mounting pins 35 I projecting from apart of the carriage framework. As the pulley I34 is being rotated by the draw band 34, incidental to line-spacing, as hereinbeiore stated, a pin I42 engages a hook-shaped end I43 of the control bar I38 to displace the latter diagonally downwardly. The result is that the bar I33 pressed down on the nose I33 so that the toggle I28, I28 becomes almost straightened and the counterstop arm 34 is displaced leftwardly 45 by the link I34 in opposition to the spring I2, the spring II3 being stronger than the spring I2. There being nothing opposing the rightward travel of the carriage, the band 34, after actuating rightwardly until the margin stop 33 engages and moves the counterstop 34 against the right end of the opening 33, whereby the toggle is moved bodily to the right, it being understood that the lowered control bar I33 meanwhile opposes upward flexing of the toggle. This action results in the restoration of the lever H3 and, consequently, in a clutch opening movement of the yoke 33, the carriage return operation being thus the line-spacing mechanism, draws the carriage 50 tlon of the control bar I33, as well as a rightward movement of the margin counterstop 34, is required for eflecting a clutch opening movement of the lever II8. Should the carriage already be in the extreme returned position at the time the carriage return key I23 is depressed, the lever II8, upon being tripped, will flex the toggle 628, I28 upwardly; and, the counterstop am being then in its rightward position, the operation of the line spacing mechanism alone, with the accompanying depression of the control her I83, will cause the restoration of the lever II8 to open clutch position. The pin and slot connection I32, I34 between the link I34 and the toggle allows iull operation oi the counterstop arm 84 by the line-end margin stop 38, even though the trip lever II8 may be in its normal, latched position, as may be realized from Fig. 2.

It will be remembered that the counterstop arm 34 moves leftwardly in consequence of the actuation of the control bar I38, provided, however, that the carriage is not in its returned position. Therefore, since leftward movement of the arm 84, as brought out before, causes an immediate movement of the slide to actuator-blocking position, it follows that the power typing instrumentalities will be positively and unfailingly locked against operation during the entire return movement of the carriage, see- Fig. 6 in which in which the carriage is being power returned.

Referring now particularly to Figs. 1 and 6, the carriage return key lever I23 is iulcrumed on the pivot rod 33 and. is guided similarly to the type key levers 33 in a slot provided in the' bar I53. In like manner, mounted directly adjacent to the carria e return lever I23 'is a lever I43 which,

has a forward end I4I adapted to enter between an abutment I43 and one of a series of blocks I3I and I32 disposed adjacently between the said abutment and another abutment I33, the latter being at the left end of the keyboard. The blocks I3I are shown .to be in the form of rolls, whereas theblock I32 comprises a bar which is nearly coextensive with the breadth of the keyboard, all the blocks being supported for lateral.

movement on a straight face I34 afforded by an incompletely shown cage, generally designated by the reference character I33, including also the said abutments I48 and I33. By reason of the carriage return lever I23 having a pin I39 overlying the lever I43, the latter lever becomes operated upon depression of the former andcauses the blocks I H, I32 to be crowded or compacted leftwardly against said abutment I33. This crowding of the blocks obstructs certain parts in the machine against operation, whereby such operations as back spacing, tabulating, and tabulator stop setting are prevented. More specifiautomatically brought to a conclusion. It, meano cally, the crowding of the blocks I3I, I32 render while, the carriage return key I23 has beenreleased, the lever "III will be relatched by the latch I22. On the other hand, if the operator has not yet released the carriage return key I23, a

secondary latch I44, alsopivotally carried on the 63 left side wall II by this pin II3, will hold the lever H3 in open clutch position pending the release of the key I23. see Fig. 1. The latches I22 and I44 have arms engaging the pin I24 at opposite sides and are yieldingly urged into contact with said pin by a common spring I43. Consequently, the latches I22, I44 are alternatively urged to effective positions by the spring I43, under the controlling influence of the key I23.

inoperable the control keys for such operations. Inasmuch as key-controlled back spacing mecha= I nisms are well-known, only aback spacing key III! is shown in the drawings. and it is evident that this key is not depressible when the leftmost block I3I iscrowded against the abutment I33 as when the front end of the lever I43 is depressed. Likewise, since tabulating mechanisms are also well-known in the art, it is deemed necessary to show and describe only such parts thereof as are more immediately associated with the locking mechanism I43, I, I32, I33. It may, however, be said that the tsbulating mechanism may be of the form shown and described in the From the above a will be seen that on 1 patent to 'Helmond No. 2,303,828, dated December 1, 194 2. From Fig. 1 it will be seen that a tabulator key I56, when operated, depresses a lever I51 extending transversely of the machine, about a pivot I56, so that its right end acts upon the front end of a lever I6I which, according to said 5 above-mentioned application, whenv acted upon. bringsabout a power-tabulating operation. However, should said blocks I5I, I52 be crowded togather, as hereinbefore mentioned, the lever I6I,

operator. On the other hand, such keys which are less frequently used, and operation of which under certain conditions might result in damage to the machine, are operable only when no damage can result. It will-also be observed that only the typing mechanism is locked at line ends, leaving the operator the opportunity to operate any one .of the keys 83, I23, I55 or I55.

and therefore also the key 151, will be locked against operation, Similarly, a tabulatorstopsetting key I 62 cannot be operated when said blocks I5I, I62 are crowded, because a link I63, pendant from an arm I64 integral with the key,

cannot enter between two of the blocks I5! immediately associated therewith. From the foregoing it is clear that no more than one of the keys I23, I56, I56, I62 may be depressed effectively at one time and that any of these keys.

when operated, will cause the remainder, as well position; and, for the purpose of maintaining the lever I46 operated during the carriage returns. independently of the release of the carriage return key I23, the right end of a link I65 connected to an arm I66 integral with the arm IIII assumes an elevated supportingposition underneath a rearwardly extending arm I61 of the lever I 46, thereby maintaining the front end of the lever I46 in block crowding, lowered position. As is seen in Fig. 1, the right end of the link I65 normally lies low in a vertical guide slot I66 provided in the right side wall II of the machine, but, incidental to the clutch closing operation, see Fig. 6, the link I65 will be cammed upwardly about its pivotal connection with the arm I66, by reason of a cam face III on the link.

The clutch 95, 66 may also be closed in response to the carriage reaching a line end position, in a manner not shown, by an automatic tripping operation of the latch I22. It will be seen that the of the lever I46 upwardly, thereby causing the crowding of the blocks I5I,' I52 to lockthe lugs I55, I56, I62. However, should the blocks, at the time the latch is automatically tripped, be crowdcooperating with the Therefore, the carriage may be back spaced,

or the margin release key may be operated, in

either case causing return of the slide I3 to nonblocking position. If the return of the carriage is in order, the carriage return key may be operated. However, it will be remembered, these keys can be operated only one at a time.

Fig. 7 illustrates a modified mechanism wherein the elongate block I52 is. replaced by addi- .tional small blocks or rolls I5I wherebetween the tym keys 35 may enter. The type keys lultjlike Y the keys I56, I56, I62, therefore, may be depressed only one at a time, whereby clashing of the type bars is positively avoided since the operator "is prevented from bringing about simultaneous, or to closely following operation of the type bars. This modified structure, however, af-

fects the key touch unfavorably and is only desirable for typists who, are inexperienced and incapable of rhythmically operating the machine. In comunction with Fig. 7, it may further be 0 stated that typing at line ends is reliably prevented through the actuator blocking member or slide I3.

What is claimed is:

1. In a power-driven typewriting machine having a frame, a carriage adapted to traverse said frame, and a multiplicity of operable type actions, the combination with power-drive means,

, of normally quiescent actuator means for each link I in such an event displaces the arm I61 mp ed by reason of an operation of one of the keys .15

I50, I56, I62, the link I65 will be stopped in its leftward movement because the arm I61 will not allow upward movement of the link as compelled by the face I II. Therefore, it is always necessary to release the keys I56, I56, I62 before an automatic carriage return operation can get under way.

It has been stated that the motor 66 rotates continuously. Likewise. the snatch roll 36 may rotate continuously and, to this end such roll or may be driven by the spindle 6|, through the medium of a belt drive, not shown.

Having the above-described locking and blocking mechanisms fully in mind, it will be seen that these mechanisms, although unfailing in their 70 purposes, do not in the least impede or otherwise disturbthe touch of the type keys 65,, which, for this reason, can be operated with an undisturbed and even rhythm and,,therefore, in more rapid of said type actions, each actuator means being movable from a normal position into transitory motion-receiving association with said powerdrive means and thereby being caused to execute a single type-action-operating cycle, at the end of which cycle the actuator means is in 'a normal position, means for selectively moving said actuator means into motion-receiving association with said power-drive means, a member operable for blocking all said actuator means against movement into said motion-receiving association but normally allowing said actuator means to be moved free thereof into. said motion-receiving association, each of said actuator means including a part wherewith said member, when operated, cooperates to efl'ect said blocking, said part of any of said actuating means being normally clear of the operating range of said member. and being unobstructing to the operation'of said member during a late portion of each cycle, means to letter-feed said carriage during said late portion of each said cycles, and means to operate said member in response .to a line-end letter-feeding movement.

2. In a power-driven typewriting machine having a frame, a carriage adapted to traverse said frame, a multiplicity of type actions, means to letter-feed the carriage in response to an operation of any type action, the combination with a power-drive element, of type action actuators movable into motion-receiving relation with said power-drive element, key means to move said actuators selectively into motion-receiving relation with said power-drive element, means. to divorce automatically. the actuators from the power-drive element and cause their return after succession and with less'attendant fatigue to the, is they have received a typing impulse, said last means providing for the return of said actuators free of said power-drive element, a member common to all said actuators, normally clear of the operating pathsin which said actuators are mov able into motion-receiving relation with said power-drive element, but operable so as to block said actuators against movement into motionreceiving relation with said power-drive element, and means including a margin stop to operate said member in response to a line-end letterfeeding movement of the carriage, said line-end letter-feeding movement occurring during the return of any actuator causing such movement, and said actuators, while returning, allowing operation of said member.

3. In a power-driven typewriting machine having a frame, a carriage adapted to traverse said frame, a multiplicity of type actions, means to letter-feed the carriage in response to an operation of any type action, the combination with a power-drive member, of type action actuators movable into motion-receiving relation with said power-drive member, key means to move said actuators selectively into motion-receiving relation with said power-drive member, means to automatically divorce the actuators from the power-drive member and cause their return after they have received a typing impulse, said last means providing for the return of said actuators free of said power-drive member, a toothed slide operable so that its teeth lock the actuators against movement into motion-receiving relation with said power-drive member, and means including a margin-stop, to operate said slide, in response to a line-end letter-feeding movement of the carriage,- said line-end letter-feeding movement' occurring during the return of any actuator causing such movement, and said actuators,

* while returning, allowing operation of said slide.

4. In a power-driven typewriting machine having a frame, a carriage adapted to traverse said frame, a multiplicity of operable type actions,

and means to power-retum said carriage, the

combination with power-drive means, of normally quiescent actuator means for each of said type actions, each actuator means being movable from normal position into transitory motion-receiving association with said power-drive means and thereby being caused to execute'a single typeaction-operating cycle at the end of which cycle the operated actuator means is in a normal position, means including type-keys for selectively moving said actuator means into motion-receiving association with said power-drive means, a

device operable for blocking all said actuator letter-feeding movement, other keys, normally ineifective key-locking means for said other keys, andmeans to render said device operated and to render said key-locking means effective during power-returns of the carriage.

5. In a power-driven typewriting machine having a frame, a carriage adapted to traverse said said last means providing for the return of said actuators free of said power-drive member, a member common to all saidaotuators, normally clear of the operating paths in which said actua-" tors are movable into motion-receiving relation with said power-drive means, but operable so as to block said actuators against movement into motion-receiving relation with said power-drive means, and means including a margin stop to operate said member in response to a line-end letter-feeding movement of the carriage, operable elements including a plurality of keys other than type-keys, locking means effective upon operation of any one of said elements to lock the remainder of said elements against operation, and means to render said member and one of said elements operated whenever the carriage is being power-returned.

6. In a power-driven typewriting machine having a frame, a carriage adapted to traverse said frame, a. multiplicity ofoperable type actions, and means to power-return said carriage, the combination with power-drive means, of normally quiescent actuator means for each of said type actions, each actuator means being movable from a normal position into transitory motion-receiving association with said power-drive means and thereby being caused to executea single typeaction-operating cycle .at the end of which the operated actuator means is in a normal position,

against movement into said motion-receiving association but. normally allowing said actuator means to be moved free thereof into said motionreceiving association, each of said actuator means including a part wherewith said device, when operated, cooperates to eflect said blocking, said part of any of said actuating means being normally clear of the operating range of said device, and being unobstructing to the operation of said device during a late portion of each cycle, means to letter-feed said carriage during said late portion of each said cycle, means to operate said device in response to a line-end letter-feeding movement, operable elements including a plurality of other keys, locking means effective upon operation of any one of said elements to lock the remainder of said elements against operation, and

means to render said device and one of said elements operated for the duration of every powerretum of the carriage.

'7. In a power-driven typewriting machine having a frame, a carriage adapted to traverse said frame, a multiplicity of ime actions, a carrinse-return key, a power carriage-return mechanism, and means responsive to the operation of said key to cause said mechanism to return said carriage to a predetermined position, the combination of an actuating'mechanism for each type action, a common power-drive member for said actuator mechanisms, each actuator mechanism adapted in consequence oi a transitory engagement with said power-drive member to ex-' ecute a type-action operating cycle, a normally ineiiective device operable to block all said actuating mechanisms against engagement with said power-drive member, means including typekeys to eflect transitory engagement of said action-receiving association with said power-drive means and thereby being caused to execute a single type-action-operating cycle at the end tuator mechanisms selectively, keys other than type-keys including a margin release key and a back-spacing key. locking means eflective upon operation of said carriage-return key or any one of the said other keys to lock the remainder of these keys against operation, and means for ren-' dering said device effective in response toa lineend letter-feeding movement, wherefore after such movement all said type-keys are blocked against operation and wherefore said other keys may then be operated, but only one at a time.

8. In a power-driven typewriting machine having a frame, a carriage adapted to traverse said frame, a multiplicity or type actions, a carriage-return key, a power-carriage return mechanism, and means responsive to the operation of said key to cause said mechanism to return said carriage to a predetermined position, the

combination of an actuating mechanism for each type action, a common power-drive member'i'or said actuator mechanisms, each actuator mechanism adapted in consequence of a transitory engagement with said power-drive member to exeof which cycle the operated actuator means is in a normal position, means including type-keys for selectively moving said actuator means into motion-receiving association with said powerdrive means, a device operable for blocking all said actuator means against movement into said motion-receiving association but normally allowing said actuator means to be moved free therewith aid device, when operated, cooperates to or into said motion-receiving association, each of said actuator means including a part wheretive upon operation of any one of the aforesaid cute a type-action-operatingcycle, a normally ineflective device operable to block all said actuating mechanisms against engagement with said power-drive member, means includingtype-keys to effect transitory engagementor said actuator mechanisms selectively, other keys, locking means effective upon operation of said carriagereturn key or any one of the said other keys to lock the remainder of these keys against operation, said locking means including an element operable by said carriage-return key, said element, when operated, causing said locking means to be eiiective with respect to all the said other keys, means to cause said responsive means to 'hold said element operated during the return of the carriage and means i'or operating said device for the duration of every power-carriage return. 4

9. In a power-driven typewriting machine having a frame, 'a carriage adapted to traverse said frame, a multiplicity of operable type actions,

and means to power-return said carriage, thev combination with power-drive means, or normally quiescent actuator means for each of said type actions, each actuator means being movable from a normal position into transitory mokeys, to lock the other keys against operation,

said locking means including an element-which by movement to an operated position will render said locking means efiective with respect to all said keys, and means for causing said element to occupy said operated position whenever the carriage is being power-returned.

10. In a power-driven typewriting machine having a frame, a carriage adapted to traverse said frame, a multiplicity oi type actions, means to letter-feed said carriage in consequence of an operation oi any type action, means to powerreturn said carriage, the combination oi a powerdrive member, normally quiescent actuator means individual to said type actions, each actuator'means being adapted to be coupled transitorily to said power-drive member and being adapted in consequence thereof to execute a type-action-actuating cycle, means including type keys to couple transitorily said actuating means selectively with said power-drive member, a toothed slide operable so that its teeth are adapted to block coupling of all said actuator means with said power drive member, means to operate said slide in response to a line-end and letter-feeding movement 0! the carriage, other keys, normally ineil'ective key-locking means for said otherkeys, and means to cause said last means to be eiiective and said slide to be operated when saidpower-carriage return means is active.

HARRY C. YAEGER.