US2620056A - Repeat typing mechanism for power-operated typewriters and like machines - Google Patents

Description

2 SHEETS-SHEET 1 W. H. KUPPER REPEAT TYPING MECHANISM FOR POWER-OPERATED TYPEWITERS AND LIKE MACHINES Dec. 2 1952 Filed Sept. 29, 1950 QN NN .INVENTOR w/LL/AM H KUPPEH A Y ATTORNEYS Patented Dec. 2, 1952 REPEAT TYPING MECHANISM FOR POWER- OPERATED TYPEWRITERS AND LIKE MA- CHINE S William H, Kupper, West -Ha'rtford, Comp, :as-

signor -to Royal'Ty-pewriterCompany, 1110., New York, N. Y., a corporation of New York Application'september 29, 1950, Serial No. 187,587

19 Claims. 1

This invention relates to power operated type" writers or likemachines, and more particularly torepeattyp'ing mechanisms for such machines.

Some power operated typewritersor like ma- 'ch'inesnow known include mechanism responsive to manipulation of a repeatkey for automatically efiecting repeated typing strokes of a typing member. In one class of such mechanisms-an actuator connected to the typing member is adapted to 'be'connected transiently ton-continuously driven member, such as a snatch roll, by depression of 'a repeat key which isequ'ipped or associated with means for automatically efiecting re-connection of the actuator with the driven member at or near the "end of each operating "cycle of the typing'member, "as long as the repeat keyis held depressed.

An object of the present invention is to prov i'de a poweroperated typewriter-or like machine having repeat typing mechanism of "the general class referred to'which is of improved construction; is certain and reliable in operation, :and which is capable of withstanding long and irequent use.

'Q'ther objects of the invention will become apparent from a reading-of the following descrip tion, the appended -claims, =a-nd 'the accompanying drawings, in which:

Figure l is a view, partly in elevation and "partly in vertical section, fore and aft of a typewriter embodying the invention, showing only some of the conventional or standard typewriter parts in order to illu'strate the application of mechanism embodymg the invention "to la '-typ'ew-ri ter construction, the parts being :shown in theirnormal or inactive positions; 1

Figure 2 is a detail horizontal section *on the line 2-2 of Figure 1;

Figure 3 is a fragmentary view, partly invertical section fore and aft of the machine, showing a type bar actuator and associated parts in the positions they occupy when the type bar is substantially in printing position, and showing 1'3. repeat typing mechanism in operated iposi-tiontin readiness ,for effecting another type bar operation upon returning of the type bar towards-its normal position;

Figure 4 is a view similar to Figure 3 but showing the parts in the positions they occupywhen the repeat mechanism, positioned as shownin Figure 3, is effective for causing another orrepeat typing operation; and 1 Figure 5 is a detail viewin side elevation-showing a typesbar head. 1 I v The inventionmay be embodied in typewriters or like machines of various kinds. Forthe purposes of illustration, the invention is shown as being embodied in an ,ofiice type typewriterhavling, except for the power generating and transmitting mechanism tobe described, many features in common with the well known Royal 2 Standard typewriter. The drawings show only enough-of thestandard or known typewriter construction to =assistin illustrating the manner in which mechanism embodying the inventionmay be coordinated with other parts of a typewriter construction. The known construction illustratedincludes a main frame A on which acarriage equipped with a platen is mounted for letter spacing and return movements by means of "a top ran I secured to and formin'gpart of the carriage, and rolling upon balls 2, which in turn are adapted "to roll on a frame-mounted bottom rail ortrac'k 3.

The carriage may be driven toward the left, that is, in the letter-spacing direction, by "any suitable mechanism, for example, by a spring barrel and draw band (not shown) of known or suitable construction. Carriage returningmech anism may be of the kind disclosed in the copending application of Henry 'J. Hart, Serial No. 21,476, filed April 16, 194:8, now United States Patent No. 2,567,937, issued September 18, 1951, or of other suitable construction, preferably power-operated.

h case shift segment element 4 is mounted :to shift vertically on the frame A by "a construction not shown but which may be of a well known form. Mechanism for shifting the segmentincludes a link 5 pivoted as at 6 to the segment and pivoted as at I to an arm 8 mounted on a shaft '9 extending lengthwise ofthetypewriter and mounted in any suitable manner at its oppo- {site ends on the vframe A. As in the standard Royal ofilce typewriter, the shaft 9 may be equipped at both ends with "a rock arm 8., and both of thearms 8 maybe associated with links 5. Counterbalancing springs, one of which is shown at It, are interposed respectively between fixed studs H on the frame A and pinsiz projecting forwardly from the segment *4;

The counterbalancing springs I 0 normally maintain the type bar segment 4 in its upper position with respect to the frame, which is in its lower case position for the purposes of typing. In order to shift the segmentA downwardly to its upper case position, the shaft -9 is.rocked counterclockwise by mechanism to be described.

In order to retain the segment 4 in its raised,

1 or lower case position so as to prevent accidental it, and a shift lock or dogl'! pivoted on the frameat l8 and normally engagingpthe bottom of the spring M.

The segment 4 is provided with the usual ,arcuate pivot wire I 9, on which. the usual complement of typing members, one only of'which is 3 shown at 2|] as a front strike type bar, is pivoted. The type bar 2|), as shown in Figure 5, has a lower case typing character 23 and an upper case typing character 2t which, in the form shown, is an underscoring or underlining character.

In general, the construction described so far is of a known kind and does not in itself constitute the present invention. The invention resides in other parts to be described, and the combinations of such other parts with each other and with the parts described above.

Broadly considered, operation of the type bar 2|) is effected by power-driven means, generally designated D, adapted to be made effective by depression of a single-stroke typing control key or a repeat stroke typing control key F. The power-driven mechanism D is generally similar to but embodies improvements in mechanism disclosed in the co-pending application of William H. Kupper, Serial No. 6,066, filed February 3, 1948, now United States Patent No. 2,567,945, issued September 18, 1951. It includes a driving element, which operates continuously, and controllable driving connections, which normally are inoperative or ineffective, but which may be conditioned by the operator to effect operative driving connection between the continuously moving driving member and the type bar 20. The driver preferably is constituted by a rotatable continuously driven member, more particuarly a toothed snatch roll or bar 2|, which may be of known form, and which is adapted to be driven in the direction of the arrow a in the Figure 1 V by any suitable means, but preferably by an electric motor (not shown).

The means for transmitting drive from the driver 2| to type bar 20 includes an actuator 22 which extends fore and aft of the typewriter and above the member 2|. The actuator 22 is pivoted as at 23 to a lever 24 at a point off-set relatively to the pivotal mounting 25 of thelever on a fixed frame cross bar 26. The actuator 22 is connected to the type bar 20 by a link 22 and has a forwardly extending part 2'! projecting under an abutment or guide plate 28 mounted on theframe A to extend parallel to the snatch roll 2 A spring 29, interposed between the front end of the actuator 22 and an anchor plate 30,

'yieldably urges the actuator to rock clockwise,

and thus normally maintains the actuator in the position shown in Figure 1 with its front end part 2'! bearing against the abutment or guide plate 28. Another abutment 3| is disposed below the abutment 28, and is slotted to receive and guide the lower extremity of the actuator part 21 for sliding movements. The lever 24 normally is held in its inactive position, shown in Figure 1, by a returning spring 32 interposed between a part (not-shown) at the rear of the frame A and a wire link 33 pivoted at 34 to the lever 24.

In order to apply a power impulse to the type bar 20, the actuator 22 is operatively but indirectly connected to the driving member 2|, the actuator itself never engaging the driving member. Mechanism for bringing about this operative connection includes an interponent pawl element 34, pivoted as at 35 on the actuator. A spring 36, anchored to the actuator 22 and connected to the pawl 34, biases or urges the latter to rock clockwise so as to move its nose into engagement with the snatch roll 2|. Normally, the pawl is maintained out of engagement with the snatch roll by the restraining action of a control element or trigger 31 which is pivoted as at 38 on the actuator 22. In the normal position of the trigger, its rear end or nose engages a holding surface 39 on the pawl so as to prevent the spring 36 from rocking the pawl 34 into drive-transmitting engagement with the driving member 2|. The pawl 34 is formed with an inclined resetter cam face 40 which is located just below the holding surface 33, and which is acted upon by the trigger nose for rocking the pawl counterclockwise, and thus resetting it in normal, inoperative position.

The mechanism for effecting single operations of the type bar 20 includes the key lever E pivoted on a fixed part 4| of the frame as at 42. An upward extension 43 on the rear end of the key lever E projects behind the depending arm 44 of a lever 45 pivoted at 46 on a frame cross bar 41. Pivoted at 48 on another arm 49 of the lever 45 is a limber dog or flipper 50 urged clockwise by a spring 5| but limited in its clockwise movement by a stop ear 52 on the lever arm 49. The lower end of the flipper 50 is disposed above a contact ear 53 on the type bar actuator 22. A tension spring 54 interposed between the key lever E and an arm 55 on the lever 45, and a compression spring 54 interposed between the lever arm 55 and an anchor plate 54 on the cross bar 41 normally maintain the parts in the positions shown in Figure 1.

In operation, when the single impression character key lever E is depressed the lever 45 is rocked clockwise, causing the flipper 50 to engage the actuator car 53 and move the actuator 22 downwardly until its associated trigger 31 is rocked to pawl-releasing position by engagement with the lower abutment 3|. The pawl or interponent 34, having been thus released, will move into engagement with the snatch roll 2| so as to be driven forwardly together with the actuator 22, thus rocking the lever 24 and actuating the type bar 20 through the link connection 22 When the pawl 34 is cast off from engagement with the snatch roll 2|, the spring 29 lifts the actuator 22 to bring the trigger 31 into engagement with the upper, trigger-resetting abutment 28. This causes the trigger 31 to be rocked counterclockwise, so as to move its rear end against the resetting cam face 40 of the pawl 34, thereby restoring the latter to its inactive position. The type bar 20 and its operating connections will then be restored to their normal positions, shown in Figure 1, by the spring 32, previously referred to.

Means are provided for adjusting or varying the amount of driving impulse generated by the power mechanism D. This variation or adjustment is effected by variably limiting the extent to which the tooth on the actuator pawl nose enters tooth interspaces on thesnatch roll 2| under the urge of the spring 36 when the restraint of the trigger 3'! on the pawl 34 is discontinued. In the form shown, the actuator 22 is provided with a downwardly extending stop element or finger 56 which is disposed in front of and normally out of contact with a downwardly extending stop part, heel, or finger 5 on the pawl 34. When the pawl 34 is rocked clockwise by the spring 33 so as to move the pawl tooth into a snatch roll tooth interspace, the pawl stop 57 moves toward the actuator stop 56, which may be so positioned as to be engaged by the stop 5'! to arrest the rocking of the pawl 34 before the pawl tooth moves to the root of the snatch roll tooth interspace. By variably positioning one of the stops 56, 51, e. g., by bending the stop 56 towards or away from the stop 51, the extent to which the pawl tooth enters the tooth interspace onthe snatch roll can be varied. Consequently, the'angle through which the snatch .roll 21 .rotates while in contact with the pawl .3'4, whichdetermines the amount .of driving :of the pawl and actuator 22 by thesnatch roll 21; can be varied. .Any'suita'blemeans ior construc-. tion may be provided for adjusting one .of the stops :56, 5:1 relatively "to the other, "but 'in the preferred construction the stop '56 is formed il'l-r tegrallywith the actuator 2-2 so as to beibenda-ble toward or away from the stop -51.

, In typewriters or like machines :in which all or some:of theinstrumentalities to beoperated. e.;g., type bars, carriage return mechanism, stabulating mechanism, escapement mechanism, backspacing mechanism, and case shift mechanism, are-operated by power, it maybe desirable .to provide means for varyingcollectively the extent of driving of the several actuator gpawls corresponding to the pawl 34-and associated with the -other mechanism referred to. This may be accomplished by providing a knock-off bar 58 mountedon the main frame was to extendunder the front ends of all of the actuators correspondingtotheactuator 22 shown in Figure '1. .Any

suitable means (not shown), may be provided for adjustably tilting .or otherwise variably positioning the knock-off bar -58 so that it will be engaged by the "lower ends of the actuators to control the timing of disengagement of the .asso! ciated actuator .pawlsfrom the snatch roll.

Mechanlsmis provided for effecting automati- .der-the'urgeof the spring .6I .is.1limited by en- :gagement of astoppart 63on the. lever "with the rear edge 64 of the frame part 60; iCounterclockwise rocking of the key F against zth'e aurge of thespringrfi l for effectingrepeated:typing operationsislimited by engagement'of:anothenstop .part ,65 on the lever with th'erear edge of the frame-part-tll.

.A wire link 66 is pivotedat itsupperv end toathe rearend of the key leverF, and is pivoted at its lower .end to the rear end of a lever :61 pivoted at 42011 the frame cross bar 4|. A flat link 68 is pivotedat 69 to the .lever .61 between thepivot 42 and the connection of the lever 61 to the link 66;andis pivoted at to a curved arm 1| secured, asbybrazingor welding, to a ,rock shaft 12. iournaled at 13 and'14 on the main frame. The arm 1| is curved .as shown in Figure 1 so as togenable it to'be'bentor mauled easily. for varying j its effective "lever .arm length and hence the relative movementsor timing of the operation of-thef parts which it connects.

Alsojsecured as by brazing or welding to the shaft '12 "is an arm 15 (see especiallyFigures 3 'and 4) which has apart 16 overlyingan .ear 11 on "a settable "contactor element .18. pivoted at 19 -on abracket 8!] secured adjustably to the bar 58 by 'screws 8|. The element 1.8 has-a contactor surface 82 whichnormally is disposed to the rear of "and "in spaced relationship to .a .pin .83 .on the bottom end of a'tail84 on the trigger 31. Normally, the rzparts are inftheposition, shown in :Figure '1 soxthat the contactorface 82 cannot engage the-spin 83 on the trigger-tail .84. Consequently, the positioning ofthe trigger 3.1 will be controlled :by the movements of the actuator 22 and the engagement of the trigger with the abutments 31 and 28, as previously described, so that single stroke typing -operations may be performed under the control of the key E and its associated mechanism.

Whenit .is desired to cause the type bar .20 :to perform automatically a succession of typing op- 'erations thezrepeat key F is depressed and held down. Depression of thekeyF willtraise the ,link 65 torock the lever "61 counterclockwise, li-ftvthe flat link 68, and rock the arm 1|, the shaft--12 and the arm 15 :clockwise. The part 16 01 the :arm '15 will press downwardly on the ear 11 0f the contactor 1-8, and rock the latter counterclockwise against the urge of a normalizing-spring -85 interposed between the eary11 and the shaft 12. The "contactor :18 will then move to and beset in the position'shown in Figures 3 ands, so as to, engage the :pin 83 on the trigger tail 84 and rock the trigger 1'31 clockwise, "thereby moving the rear end of the trigger belowrthe holding surface 39 on the pawl 34, and enabling the spring 36 to rock the pawl into engagement with the snatch roll2l. In this manner, the pawl 34, and actuator 22 will be \operatively connected to the. :snatch IIOll :2] without first .loweringithe actuator 22, 'as'is necessary for-effecting connection of the pawl and actuator 'to the snatch roll when the single stroke key E is depressed.

After the pawl 34 has been moved into engagement with the snatch roll 2 l, :the pawland actuatorwill be moved forwardly as a unit to drive the type bar 2llwto-printing position. When the .pawl :34 has. been cast free of engagement with the snatch roll-the spring 29 will move the :acltuator-22 upwardly to bring the .triggerintoengage- .ment: with the resetting abutment 2B, and .the spring 32 will rock the lever 24 clockwise :tomove again to be drivenlforwardly with a consequent further typing stroke of the typebar 120. This sequence of "operations will be repeated cyclically until the repeat :keyF is released to permit the springtl to return the key and .the contactor'18 ltortheir .norm'alpositions, so that the contactor .face82 "cannotagain engage the pin 83am the trigger. tail :84. When the pawl 34 is cast free of .the :snatch :roll :21, .the spring 29 will raise .the :actuator'22 during its return stroke so as to bring the :trigger 31"into engagementWith the reset- ;tingabutment 28, thereby rocking the trigger '31 counterclockwise about its pivot .38, unrestrained -bymthe contactor 18, and causing the rear-end :ofthe triggeryto act on the resetting cam :face -40. :This will return the pawl 34 to its normal position, enabling the :parts to come to rest.

. Any suitable means may be employed rorrocking the ;shaft:9 toeifect case. shifting movements of the type bar segment 4. Preferably, a .power operated means such as that disclosed in the co- 7 pending application of William H. Kupper, Serial No. 133,322, filed December 6, 1949, now United States Patent No. 2,590,777, issued March 25, 1952,

is provided. Only parts of this power operated mechanism are disclosed herein, reference being made to the aforesaid co-pending application for a more detailed description. Included in the case shifting mechanism shown is an adjustable link 86 adapted to be driven by an actuator similar to the actuator 22 so as to transmit case shifting effort to the shaft 9 through a cushioned drivetransmitting device generally designated 81.

The cushion lever device 81 includes a lever arm 88 which is fast on the shaft 9 and which is formed with a rearwardly extending part 89 provided with a plurality of spring seats 99. Another lever arm 9|, pivoted as at 92 on the arm 88, is provided with a pin projection 93which is movable in a slot 94 in the lever arm 88, the ends of the slot 94 being engageable by the pin 93 for limiting relative rocking or pivotal movement of the lever arms 88 and 9I. A drive-transmitting spring 95 is interposed between the arm 9I and one of the spring seats 99 which may be selected for varying the effect of the spring in urging the lever arms 9I and 88 to rock toward each other.

The rear end of the link 86 is pivoted to the arm 9| by a pin 96 secured to the lever arm SI and projecting into a horizontally extending slot 91 in the rear end of the pull link 86. Normally, when the parts are in the positions shown in Figure 1 with the segment 4 in its raised, or lower case position, the pin 96 is at the front end of the slot 91.

In operation, when the link 86 is pulled for wardly by power transmitted from the snatch roll 2|, e. g. through the medium of mechanism of the kind disclosed in application Serial No. 133,322, now United States Patent No. 2,590,777, issued March 25, 1952, referred to above, the lost motion at the pivot 969'I will be taken up. Thereafter, the rear end of the slot 91 will engage the pin 96; and the lever arm 9| will be rocked counterclockwise. This will exert a pull on the cushioning, force-transmitting spring 95, resulting in rocking the lever arm 88 counterclockwise, with consequent counterclockwise rocking of the shaft 9 and the rock arms 8 so as to pull the links and segment 4 downwardly. During the intiial forward movement of the link 86, and prior to rocking of the lever arm 9|, the segment locking dog I1 is withdrawn from engagement with the spring abutment I4 by a link 98 interposed between the locking dog I1 and an ear 99 on the link 86.

The case shifting mechanism is controlled by a shift key structure including a left shift key lever I99 and a right shift key lever I9I united by a bar I92 so as to be depressible or rockable as a unit about a pivot I93 on the frame cross bar 4|. The left shift key lever I99 is formed with 'an upper extension I94 projecting behind a lever corresponding to the lever 45 previously referred to. The arrangement is such that, when the shift key structure I99I9II92 is depressed or rocked about its pivot I93, the extension I94 operates its associated lever so as to effect connection of the snatch roll 2| with an actuator similar to the actuator 22 and to which the link 86 is connected, whereby the link 86 will'be pulled forwardly and held in its actuated position by mechanism described in detail in application 2,590,777, issued Marchv 25, 1952, previously re ferred to.

A shift lock key I is pivoted as at I93, and is equipped with a pin I96 overlying a tail I91 on a detent or pawl I98 which is pivoted at I99 on the left shift key I99. The pawl I98 is formed with a notch II9 which normally is disengaged from an ear III fixed to the frame A, the pawl I98 being held in the normal position shown in Figure 1 by a spring II2 connected to the pawl and anchored at II3 on the left shift key lever I99. In operation, when the shift lock key I95 is depressed, its pin I96 presses on the tail I91 of the pawl I98 so as to rock the rear and upper end of the pawl into engagement with the flat rear face of the fixed ear III, which stops rocking of the pawl relatively to the shift lock lever I95. Further depression of the shift lock lever I95 then causes downward movement of the left shift key I99 on which the pawl I99 is mounted, thus causing the segment shifting mechanism to operate as previously described. During a slight further downward movement of the shift lock lever I95, the front edge of the rear end of the pawl I98 will move below the ear III, permitting the pawl to rock a little further so as to enable the notch H9 in the pawl to receive the lower edge of the fixed ear III. When, thereafter, pressure on the shift lock key is removed, the pawl I98, now being operatively engaged with the ear II I, will hold the shift lock key I95 and the shift key structure I 99I9I-I92 depressed. In order to return the parts to their normal positions, the shift key structure I99I9I--I92 is depressed so as to permit the spring IIZ to return the pawl I98 to its normal, non-latching position. Then, upon relieving pressure on the shift key structure I99I9I--I92, the parts will be returned to their normal positions by a normalizing spring II4 connected between the right shift key lever I9I and the anchor plate 39.

The construction described with reference to the accompanying drawings embodies the invention in a preferred form, but it is intended that it be considered as illustrative rather than definitive of the invention. The invention is defined in the claims.

Iclaim:

1. In a power operating mechanism for a typewriting or like machine, a typing member; a power-driven member; an actuator; means connecting said actuator to said typing member; an mterponent rockably mounted on said actuator for movement into operative engagement with sa1d driven member and for reverse movement out of operative engagement with said driven member, and being biased to rock in one direction from a normal position in which it is disengaged from said actuator into operative engagement therewith; a trigger movably mounted on said actuator and normally maintaining said interponent disengaged from said driven member; a typing control mechanism including a settable element engageable with said trigger for moving said trigger to release said interponent and enable it to rock in said one direction into engagement with said driven member whereby said actuator will be driven by said driven member to operate said typing member during the course of which operation said interponentis thrown out of engagement with said driven member; means for then returning said actuator towards its normal non-actuated position; and means for rock- Serial No. 133,322, now United States Patent No. 7 ing said interponent in the reverse direction to return. it to its normal position, said typing control mechanism including a manipulatable member operable for moving said settable element to its set position for engaging-said trigger when said manipulatable member is operated, and for maintaining said settable member in its set position for repeatedly re-engaging said trigger when said manipulatable member is held in mani-pu lated position thereby to prevent returning of said trigger to its normal position, whereby, during returning of said actuator towards its normal non-actuated position, said interponent will reengage said driven member to be repeatedly driven thereby for efiecting repeated driving of said actuator and repeated typing operations of said typing member.

, 2; In power operating mechanism for a typewriting or like machine, a typing member; a power-driven member; an actuator; means connecting said actuator to said typing member; an interponent mounted on said actuator for movements into and out of operative engagement with said driven member and being biased to move from a normal position in which it is disengaged from said actuator into operative engagement therewith; a trigger normally maintaining said interponent disengaged from said driven member; a typing control mechanism including a settable element engageable with said trigger for moving said trigger to release said interponent and enable it to move into engagement with said driven member whereby said actuator will be driven by said driven member to operate said typing member during the course of which. operation said interponent is thrown out of engagement with said driven member; meansfor then returning said actuator towards its normal non-actuated position; means for returning said interponent to its normal position in response to returning of said trigger to its normal position, said typing control mechanism including a manipulatable membercperable for moving said settable element to its set position for engaging said trigger when said manipulatable member is operated, and for maintaining said settable member in its set position for repeatedly re-engaging said trigger when said manipulatable member is held in manipulated position thereby to prevent returning of said trigger to its normal position, whereby, during returning of'said actuator towards its normal non-actuated position, said interponent will re-engage said driven member to be repeatedly driven thereby for effecting repeated driving of said actuator and repeated typing operations of said typing 5 member; and trigger re-setting means operable when said settable element has been returned to its normal position in which it is not engageable with said trigger, for returning said trigger to its normal position and thereby returning said interponent to its normal position on said actuator.

3. In power operating mechanism for a type writing or like machine, a typing member; a power-driven member; an actuator; mean connecting said actuator to said typing member; an interponent mounted on said actuator for move-- ments into and out of operative engagement with said driven member and being biased to move from a normal position in which it is disa typing control mechanism including. a settable element engageable with said trigger for moving said trigger in one direction about its pivot to release said interponent and enable it to move into engagement with said driven member whereby said actuator will be driven by said driven member to operate said typing member during the course of which operation said interponent is thrown out of engagement with said driven member; means for then returning said actuator towards its normal non-actuated position, said typing control mechanism including a manipulatable member operable for moving said settable element to its set position for engaging said trigger when said manipulatable member is operated, and for maintaining said settable member in its set position for repeatedly rel-engaging said trigger when said manipulatable member is held in manipulated position thereby to prevent returning of said trigger to its normal position, whereby, during returning of said actuatortowards its normal non-actuated position, said interponent will re-engage said. driven member to be repeatedly driven thereby for effecting repeated driving of said actuator and repeated typing operations of said typing member; .and means responsive to returning of said settable element to normal position for rocking said trigger reversely about its pivot to move a part of said trigger against said re-setting'cam face and thus move said interponent from engagement with said driven member;

4. In power operating mechanism fora typewriting or like machine, a typing member; a power-driven member; an actuator; means connecting said actuator to said typing member; an interponent rockably mounted on said actuator for movement intooperative engagement with said driven member and for reverse movement out of operative engagement with said driven member, and being biased to rock in one direction from a normal position in which it is disengaged from said actuator into operative engagement therewith; a trigger mounted on said actuator and normally maintaining said interponent disengaged from said driven member; means for rocking said interponent in the reverse direction for returning it from its operative position to its normal position; a typing control mechanism including a contactor, means mounting said contactor so as normally to be disengaged from said trigger but so as to be movable into engagement with said trigger for actuating said trigger to release said interponent and enable it to be rocked by its bias into engagement with said driven member whereby said actuator will be driven by said. driven member to operate said typing member during the course of which operation said interponent is thrown out of engagement with said driven member. and a manipulatable member for moving said contactor into operative position for engagement with said trigger and holding said contactorin its operative position as long as said manipulatable member is held manipulated; and means for then returning said actuator towardsit's normal non-actuated position, saidcontactor, when in its operative position, being engageable with said trigger when said actuator returns towards its normal non-actuated position for holding said trigger in actuated, interponent-releasing position, whereby the bias on said interponent will maintain said interponent in position for reengagement with said driven member, thereby effecting repeated driving of said actuator and said typing member. by said drivenmember while said'manipulatable member is held in man pulated position. j V U H A if 5. In power operating mechanism for a typewriting. or likemachine, ai ping member; a rotatable driven member; a movably mounted actuator; means operatively connecting said actuator to said typing member; an interponent mounted movably on said actuator; a spring urging said interponent to move into drive-transmitting engagementwith said driven member; a triggerlmounted movably .on said actuator and normally occupying a position in which it maintains said interponentout of drive-transmitting engagement with said driven member; key-controlled means including a contactor normally disengaged from said trigger in any position of said ,triggerbutbeing movable intoan actuated position for engaging said trigger for moving said trigger to release said interponent and enable the latter to be moved by said spring into drivetransmitting engagement with said driven member, whereby said actuator will be driven through said interponent until the latter is thrown out of engagement with said driven member; means for urging said actuator to return to normal position upon such disengagement of said interponent from said driven member; an abutment engageable by said trigger when said actuator is so return-moved and said contactor is in its normal position for returning said trigger to its initial position on said actuator; and means associated with said trigger andsaid interponent for returning said interponent to its normal position when said trigger is returned to its initial position, said key-controlled means including mechanism for holding said contactor in its actuated position as long as the key of said key-controlled means is in operated osition.

6. In power operating mechanism for a type- .writing or like machine, a typing member; a rotatable driven member; a movably mounted actuator; means operatively connecting said ac- .tuator to said typing member; an interponent mounted movably on said actuator; a spring urging said interponent to move into drive-transmitting engagement with said driven member; a

trigger mounted pivotally on said actuator and having a nose and a tail, and normally occupying ,a position in which said nose engages and maintains said interponent out of drive-transmitting engagement with said driven member; key-controlled means including a pivoted element having a contactor surface normally disengaged from said trigger tail in any position of said trigger, saidelement being rockable to an actuated position in which said contactor surface is engageable with said trigger tail for, moving said trigger to release said interponent and enable the latter to be moved by said spring into drive-transmitting engagement with said driven member, whereby saidactuator will be driven through said interponent until the latter is thrown out of engagement with said driven member; means for urging said actuator to return to normal position upon such disengagement of said interponent from said driven member; an abutment engageable by said trigger when said actuator is so returnmoved and said pivoted element is in its normal position for returning said trigger to its initial position on said actuator; and means associated with said trigger and said interponent for returning said interponent to its normal position when said trigger is returned to its initial position, said 12 V key-controlled means including mechanism for holding said pivoted element in its rocked position with said contactor surface positioned for engagement with said trigger tail as long as the key of said key-controlled means is in operated position.

'7. In power operating mechanism for a typewriting or like machine, a typing member; a rotatable driven member; a movably mounted actuator; means operatively connecting said actuator to said typing member; an interponent mounted movably on said actuator; a spring urging said interponent to move into drive-transmitting engagement with said driven member; a trigger mounted movably on said actuator and normally occupying a position in which it maintains said interponent out of drive-transmitting engagement with said driven member; an abutment; means for effecting single stroke actuation of said typing member including key-controlled means for moving said actuator to move said interponent towards but not into engagement with said driven member and simultaneously to move said trigger into engagement with said abutment to thereby actuate said trigger to release said interponent and enable the latter to be moved by said spring into drive-transmitting engagement with said driven member, whereby said actuator will be driven through said interponent until the latter is thrown out of engagement with said driven member; means for urging said actuator to return to normal position upon such disengagement of said interponent from said driven member, a second abutment engageable by said trigger when said actuator is so return-moved ifor returning said trigger to its initial position on said actuatonand means associated with said trigger and said interponent for returning said interponent to its normal position when said trigger is returned to its initial position; and means including a, repeat key for automatically effecting repeated actuation of said typing member as long as said repeat key is held depressed including an element formed with a contactor face normally positioned to be disengaged from said trigger in any position of said trigger, and connections between said repeat key and said element for moving said element in response to depression of said repeat key to a position in which said contactor face is engageable with said trigger when said actuator is in or is approaching its normal position for preventing said trigger from returning said interponent to its normal position.

8. Mechanism as set forth in claim '7 in which the connections between said repeat key and said element include a link operable by said repeat key; a shaft to which said element is attached; and an arm secured to said shaft and being pivotally connected to said link.

9. Mechanism as set forth in claim 8 in which said arm is curved and is thereby readily deformable for varying the relative locations of said shaft and said pivotal connection betweensaid arm. and said link.

WILLIAM H. KUPPER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,043,393 Pasinski June 9, 1936 2,188,935 Wittenmyer Feb. 6, 1940

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