US2590777A - Case shifting mechanism and repeat typing mechanism for power-operated typewriters and like machines - Google Patents

Description

W. H. KUPPER March 25, 1952 CASE SHIFTING MECHANISM AND REPEAT TYPING MECHANISM FOR POWER-OPERATED TYPEWRITERS AND LIKE MACHINES 16. 3.949

5 Sheets-Sheet l Filed Dec.

W. H. KUPPER March 25, 1952 2,590,777 CASE SHIFTING MECHANISM AND REPEAT TYPING MEcHANIsM FOR POWER-OPERATED TYPEWRITERS AND LIKE MACHINES Filed DeC.

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w. H. KUPPER ,590,777 CASE SHIFTING MECHANISM AND REPEAT TYPING MECHANISM FOR POWER-OPERATED TYPEWRITERS AND LIKE MACHINES 16, 1949 5 Sheets-Sheet 3 jaw/www? ATTORNEYS lNvENToR afl/lgfgr MMM .www wwsm QwN March 25, 1952 Filed Dec.

March 25, 1952 W, KUPPER 2,590,777

CASE SHIFTLNG MECHANISM AND REPEAT TYPING MECHANISM FOR POWER-OPERATED TYPEWRITERS AND LIKE MACHINES Filed Dec. `16, 1949 5 Sheets-Sheet 4 vllll( INVENTOR william/57.529267' y fr: Bm/yzy/M March 25V, 1952 w. H. KUPPER 2,590,777 cAsE SHIETING MECEANISM AND REPEAT TYPING MECEANISM FOR PowER-oPERATED TYPEWRITERS AND LIKE MACHINES Filed Dec. 5 Sheets-Sheet 5 Patented Man 25, 1952 CASE SHIFTING MECHANISM AND REPEAT TYPING MECHANISM FOR POWER-OPER- ATED TYPEWRITERS AND LIKE MA- CHINES William H. Kupper, West Hartford, Conn., as-

signor to Royal Typewriter Company, Ine., New York, N. Y., a corporation of New York Application December 16, 1949, serial No. 133,322

(cl. 1in- 17) 31 Claims. l

This invention relates to power operated typewriters or like machines and more particularly to case shifting mechanism and repeat typing mechanism for such machines. Some power operated typewriters or like machines now known include power operating mechanism for shifting a case shiftable element and holding it in shifted position and power operating mechanism responsive to manipulation of a repeat key for effecting automatically repeated typing strokes of an typing member.

An object of the present invention is to provide a power operated typewriter or like machine including power operated case shifting and repeat typing mechanism operable under the conjoint control of a single manipulatable element e. g., a key, for shifting the case shiftable element and automatically effecting rrepeated typing operations of one of the typing members. Constructions embodying the invention are especially suited for shifting a typewriter case shiftable element and effecting automatically repeated operation of a type bar or the like having an underscoring character correlated to the other parts so as to be effective for typing when the shiftable element is in shifted position.

Another object of the invention is to provide an improved power operated case shifting mechanism for typewriters or like machines.

Another object of the invention is to provide an improved arrangement of connections for transmitting a cushioned or shockless drive from a power mechanism to the case shiftable element of a typewriting or like machine.

Another object of the invention is to provide a power operated case shifting mechanism including a novel and improved arrangement for retaining the case shiftable element in shifted position after the drive connections between the case shiftable element and a continuously operating driving means have been disabled.

A further object of the invention is to provide a novel and improved mechanism for effecting automatically repeated typing operations of a type bar or similar member.

Other objects of the invention will become apparent from a reading of the following description, the appended claims, and the accompanying drawings in which:

Figures 1 to 5 show one form of mechanism embodying the invention, and more specifically;

Figure 1 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 illustrate the application of mechanism embodying the invention to a typewriter construction, the parts being shown in their normal or inactive positions;

Figure 2 is a fragmentary view, partly in section and partly in elevation, showing a cushion lever device and associated elements with the parts shown in their activated positions, that is, the positions they occupy when a case shift element is in upper case position;

Figure 3 is a fragmentary view, partly in vertical section, fore-and-aft of the machine, with parts shown in elevation in the positions they occupy when the case shift element is in upper case position;

Figure 4 is an enlarged substantially horizontal sectional view on the irregular line 4-4 of Figure 3; and

Figure 5 is an enlarged detail fragmentary sectional view on the line 5-5 of Figure 3;

Figures 6 to 9, inclusive, show a case shift mechanism generally similar to the mechanism shown in Figures 1 to 5, inclusive, and also illustrate more fully a repeat typing mechanism only a part of which is shown in Figure 1, and more particularly;

Figure 6 is a view similar to Figure 1, but showing in combination the case shifting mechanism and the repeat typing mechanism with the parts shown in their normal or inactive positions;

Figure 7 is a fragmentary view, partly in vertical fore-and-aft section, of a key operated mechanism shown in Figure 6 but with the parts shown in their actuated positions;

Figure 8 is a detail perspective view of a key or the like member for operating both the case shifting mechanism and the repeat typing mechanism; and

Figure 9 is a detail horizontal section on the line 9 9 of Figure 6.

Figures 10 to 12, inclusive, show a further modied construction embodying both a case shifting mechanism and a repeat typing mechanism, and more particularly;

Figure 1) is a view similar to Figure 6 but showing the modied construction with the parts in their normal or inactive positions;

Figure 11 is a fragmentary vertical sectional View fore-and-aft of the machine, showing key mechanism illustrated in Figure 10, butwith the parts in their active positions; and

Figure 12 is a perspective, skeletonized view of the mechanism shown in Figures 10 and 11, with some parts omitted.

The invention may be embodied in typewriters or like machines of various kinds. For the purposes of illustration, the invention is shown as being embodied in an office type typewriter having, except for the power generating and transmitting mechanism to be described, many features in common with the well known Royal Standard typewriter. The drawings show only enough of the standard or known typewriter construction to assist in illustrating the manner in which mechanism embodying the invention may be coordinated with other parts of a typewriter construction.

The embodiment of the invention shown in Figures 1 to 5, inclusive, will be described rst. The known construction illustrated in these figures includes a main frame A on which a carriage B equipped with a platen C is mounted for letter spacing and return movements by means of a top rail I secured to the carriage, and rolling upon balls 2, which in turn are adapted to roll on a frame-mounted bottom rail or track 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 returning mechanism may be of the kind disclosed in the co-pending application of Henry J. Hart, Serial No. 21,476, led April 1B, 1949, now U. S. Patent No. 2,567,937, or of other suitable construction, preferably power-operated.

A 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 segment includes a link 5 pivoted as at 6 to the segment and pivoted as at 1 to an arm 8 mounted on a shaft 9 extending lengthwise of the typewriter and mounted in any suitable manner at its opposite ends on the frame A. The arm 8 is formed with an extension I3 provided with a hook portion II to which is connected the front end of a counterbalancing spring I2 the rear end of which is anchored on a fixed bracket I3. As in the standard Royal ofce typewriter, the shaft 9 may be equipped at both ends with a rock arm 8, and both of the arms 8 may be associated with links 5 and counterbalancing springs i2.

The counterbalancing springs I2 normally maintain the type bar segment 4 in its upper position with respect to the frame, which is its lower case position for the purposes of typing. In order to shift the segment 4 downwardly to its upper case position, the shaft 9 is rocked counterclockwise by mechanism to be described. The downward movement of the case shift element 4 is cushioned by springs I4 and nuts I5 mounted on studs I6 carried by opposite sides of the segment and being arranged to move vertically through apertured fixed frame parts I1 as shown in Figure 3. Movement of the segment 4 upwardly to its lower case position is cushioned by springs I8 and nuts I9 mounted on the studs I6 below the fixed frame parts I1.

In order to retain the segment 4 in its raised, or lower case position so as to prevent accidental displacement which might be caused by vibration incident to operation of the machine, a segment lock or anti-vibration device, generally designated 20, is provided. The device comprises a cushion springv 2| carried by a mounting member 22 secured to the segment 4 by a screw 23, and a shift lock or dog 24 pivoted on 4 the frame at 25 and normally engaging the bottom of the spring 2|.

The segment 4 is provided with the usual arcuate pivot wire 26 on which the usual complement of typing members, one only of which is shown at 21 as a front strike type bar, is pivoted. The type bar 21, shown, has a lower case typing character 21a and an upper case typing character 21b 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, counterclockwise rocking of the shaft 9 and consequent shifting of the segment 4 are effected by power-driven means, generally designated D, which may be made effective by depression of a manually operable shift key E. Power is transmitted from the power-driven means D through a train of driving connections F. The construction and arrangement of the parts is such that, upon depression of the shift key E, a quickly generated power impulse is transmitted through a cushion device embodied in the train of connections F, to the shaft 9 so as to rock the latter and operate the associated shift mechanism in the manner previously described.

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 U. S. Patent No. 2,567,945. 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 koperator to effect operative driving connection between the continuously moving driving member and the train of connections F. The driver preferably is constituted by a rotatable continuously driven member, more particularly a toothed snatch roll or bar 28, which may be of known form, and which is adapted to be driven in the direction of the arrow a in the Figure 1 by any suitable means, but preferably by an electric motor (not shown).

The means for transmitting drive from the driver 28 to the connections F includes an actuator 29 which extends fore and aft of the typewriter and above the member 28. The actuator 29 is pivoted as at 30 to a lever 3| at a point oifset relatively to the pivotal mounting 32 of the lever on a fixed frame cross bar 33. The actuator has a forwardly extending part 34 projecting under an abutment or guide plate 35 mounted on the frame A, to extend parallel to the snatch roll 28. A spring 36, interposed between the front end of the actuator 29 and an anchor plate 31, yieldably Vurges the actuator to rock clockwise, and thus normally maintains the actuator in the position shown in Figure 1 with its front end part 34 bearing against the abutment or guide plate 35. Another abutment 38 is disposed below the abutment 35, and is slotted to receive and guide the lower extremity of the actuator part 34 for sliding movements. The lever 3| normally is held in its inactive position, shown in Figure 1, by a returning spring 39 interposed between an ear 40 on the lever and an anchor plate 4| mounted on the fixed cross bar 33 by screws, one of which is shown at 42. The lever 3| has a stop part 43 engageable with a xed stop strip 44 for limiting the returning movement of the lever under the urge of the spring 39.

In order to apply a power impulse to the train of driving connections F, the actuator 29 is operatively but indirectly connected to the driving member 28, the actuator itself never engaging the driving member. Mechanism for bringing out this operative connection includes an interponent pawl element 45, pivotally mounted as at 46 on the actuator. A spring 41, anchored to the actuator 29 and connected to the pawl 45, biases or urges the latter to rock clockwise so as to move its double toothed nose into engagement with the snatch roll 28. Normally, the pawl is maintained out of engagement with the snatch roll by the restraining action of a control element or trigger 48 which is pivotally mounted as at 49 on the actuator 29. In the normal position of the trigger, its rear end engages a holding surface 50 on the pawl so as to prevent the spring 41 from rocking the pawl 45 into drive-transmitting engagement with the driving member 28. The pawl.45 is formed With an inclined resetter cam face 5l which is located just below the holding surface 50, and which is acted upon by the trigger for rockingthe pawl counterclockwise, and thus resetting it in normal, inoperative position.

Operator controlled means for bringing about operative driving connection between the driver 28 and the actuator 29 includes the manually operable shift key E pivoted as at 52 on the frame A. As is customary, the shift key structure E includes two key lever parts at opposite sides of the machine, only the one of such parts at the left of the machine being shown, and designated 53. The key lever part 53 is equipped with a shift vkey lock lever 54 to be described later. The shift key lever part at the right of the machine is similar to the lever part 53 shown, but need not be provided with a locking lever corresponding to the lever 54. Both of the shift key lever parts 53 are joined by a rod 55 extending transversely across the front of the machine so as to form a solid unit shift key structure E. Both levers 53 have rearward extensions 56 pivotally mounted on the frame pivot 52.

The key structure E has a rearward projection 51 and an upward projection 58 disposed behind f an arm 59 of an operating lever 68, pivoted as at 6I on a frame-mounted cross bar 62. The lever 68 has another arm 63 on which a limber dog or flipper 64 is pivoted at 65. A spring 66 urges the limber dog 64 to rock clockwise to yieldably retain it in its normal position of rest against a limit stop 61 on the lever arm 63. Thepdog 64 can swing counterclockwise from the position shown in Figure 1, but cannot move clockwise from this position. A returning spring 68, interposed between the key structure E and a short arm 69 on the lever 60, yieldably holds the lever 60 and the key structure E in their normal positions. When the parts are in their normal positions the spring 68 holds the lever 60 so that the lower end of the limber dog 64 overlies a contact ear on the actuator 29, and holds the key E so that it bears upwardly against a cushion stop 1 I.

In operation/When the shift key Eis depressed, lthe lever 68 is rocked clockwise to cause the flipper 84 to push the actuator 29'downwardly to an initial extent sulicient to bring the trigger 48 into engagement with the abutment 38. This causes the trigger to be rocked clockwise about its pivot 49, so as to release the pawl 45, which is then moved by the spring 41 into engagement with the snatch roll 28. The snatch roll then drives the assembly constituted by the pawl 45, actuator 29 and trigger 48 forwardly as a unit so as to operate the case shift mechanism through the train of connections F in a manner hereinafter described. When the pawl 45 is cast off from engagement with the snatch roll 28, the spring 35 lifts the actuator 29 to bring the trigger 48 into engagement with the upper, trigger-resetting abutment 35. This causes the trigger 48 to be rocked counterclockwise, so as to move its rear end against the resetting cam face 5| of the pawl 45,' thereby restoring the latter to its inactive position.

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 teeth on the actuator pawl nose enter tooth interspaces on the snatch roll 28 under the urge of the spring 41 when the restraint of the trigger 48 on the pawl 45 is discontinued. In the form shown, the actuator 29 is provided with a downwardly extending stop element or finger 12 which is disposed in front of and normally out of contact with a downwardly extending stop part, heel, or finger 13 on the pawl 45. When the lpawl 45 is rocked clockwise by the spring 41 so as to move the teeth on the pawl nose into snatch roll tooth interspaces, the pawl stop 13 moves toward the actuator stop 12, which may be so positioned as to be engaged by the stop 13 to arrest rocking of f the pawl 45 before the pawl teeth move to the roots of the snatch roll tooth interspaces. By variably positioning one of the stops 12, 13, e. g., by bending the stop 12 towards or away from the stop 13, the extent to which the pawl teeth enter the tooth interspaces on the snatch roll can be varied. Consequently, the angle through which the snatch roll rotates while in contact with the pawl, which determines the amount 0f driving of the pawl 45 and actuator 29 by the snatch roll 28, can be varied. Any suitable means or construction may be provided for adjusting one of the stops 12, 13 relatively to the other, but in the preferred construction the stop 12 is formed integrally with the actuator 29 so as to be bendable toward or away from the stop 13.

In typewriters or like machines in which all or some of the instrumentalities to be operated, e. g., type bars, carriage return mechanism, tabulating mechanism, escapement mechanism, back spacing mechanism, as well as case shift mechanism, are operated by power, it may be desirable to provide means for varying collectively the extent of driving of the several actuator pawls corresponding to the pawl 45 and associated with the other mechanism referred to. This may be accomplished by providing a knockoi bar 14 mounted on the main frame so as to extend under the front ends of all of the actuators corresponding to the actuator 29 shown in Figure 1. Any suitable means (not shown), may be provided for adjustably tilting or otherwise variably :positioning the knock-off bar 14 so that it will be engaged by the lower ends of the actuators to control the timing of disengagement of the associated actuator pawls from the snatch roll.

The train of connections F is so arranged, constructed, and coordinated with the power mechanism D and case shift mechanism as to suppress or cushion the impact or concussion which otherwise would be transmitted abruptly from the power mechanism D to the shift mechanism. Accordingly, undesirable noise and harmful shocks are prevented, and danger of jamming of the machine with resultant damage is eliminated. In the construction shown, a pull link generally designated 15 is pivoted as at 3D to the actuator 29 and is pivoted as at 16 to a cushioned lever device generally designated 11 arranged to operate the shaft 9 for shifting the segment 4. The pull link 15 preferably is constructed so as to permit its being adjusted to different lengths. As shown, the link 15 comprises two joined sections Ia and 15b. The section b is formed with a horizontal slot 13 which receives a pin 19 secured to the section 15a. The section 15b also is formed with a horizontal slot 88 which receives the shank of a screw 8| having threaded connection to the section 15a. The section 'i5EL is formed with a vertical slot 82 in which is disposed the eccentric head of a stud 84 secured to the section 15b by a nut 85. In order to adjust the length of the link 15, the screw 8| and nut 85 are loosened, and the eccentric stud head 84 is turned to effect relative endwise shifting of the link sections 15a and 15b, after which the screw 8| and nut 85 are tightened to lock the link sections in adjusted positions.

The pivot 38, previously referred to, is c-onstituted by a shoulder stud passing through the lever 3|, the rear end of the actuator '28 and the front end of the link section 15b, the stud being threaded to the rear end of a shift mechanism locking bar 88. The link 15 and bar 85 oscillate together, and conjointly constitute a case shift actuator and retainer, the retaining operation of which will be described later.

When the interponent and actuator 29 are moved forwardly by the snatch roll 28 in the manner previously described, the link 15 also will be moved forwardly. This motion of the link 15 is utilized for transmitting force through the cushi-on lever device, generally designated 11, so as to rock the shaft 9 counterclockwise and move the segment 4 downwardly through the operation of the arms 8 and links 5, previously referred to. The cushion lever device 11 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 98. Another lever arm 9 l, pivoted as at 92 on the arm 88, is provided with a pin projection 93 which is movable in a slot 94 in the lever arm 88, the r ends of the slot 94 being engageable by the pin 93 for limiting relative rocking or pivotal movement of the lever arms 88 and 9 I. A drive-transmitting spring 95 is interposed between the arm 9| and one of the spring seats 98 which may be selected for varying the effect of the spring in urging the lever arms 9| and 88 to rock toward each other.

The pivot 16, previously referred to, is constituted by a pin secured to the lever arm 9| and projecting into a horizontally extending slot 95 in the rear end of the pull link 15. Normally when the parts are in the positions shown in Figure l with the segment 4 in its raised, or lower" case position, the pin 18 is at the front end of the slot 95.

ln operation, when the shift key structure E is epressed, the interponent 45 will become engaged with the snatch roll 28, and the interponent and its associated actuator 29 will be driven forwardly in the manner previously described. The forward driving of the actuator 29 will impart a sudden or quickly applied impulse to move the pull link 15 forwardly. The sudden forward movement of the pull link 15 will rst take up the lost motion at the pivot 16, and when the rear end of the slot 98 engages the pivot pin, 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 5 and segment 4 downwardly. During the initial forward movement of the link 15, and prior to rocking of the lever arm 9|, the segment locking dog 24 is withdrawn from engagement with the spring abutment 2| by mechanism to be described later.

It is desirable that the segment 4 remain in its lower position on the frame, that is, its upper case position, following its shifting by the mechanism D, as long as the shift key structure E is held depressed. Inasmuch as the interponent 45 is cast off the snatch roll 28, and is then returned to its normal position when the key structure E is held depressed, it is necessary to provide additional mechanism for maintaining the segment 4 in its shifted or upper case position. In mechanism constructed in accordance with the present invention, the locking bar or link 86, previously referred to, extends from the pivot 30 forwardly for cooperation with cooperating locking mechanism disposed near the front of the machine. Preferably, the link 88 is constructed to permit its being adjusted as to length. In the form shown, the link 86 comprises two relatively adjustable sections 88a and 85h. The section 85EL has a horizontal slot 91 receiving a pin 98 on the section 88h, and a horizontal slot 99 receiving a screw |00 threaded to the section 86h. A vertical slot |8| in the section 86b receives the eccentric head on a stud |82 secured to the section 85EL by a nut |83. By loosening the screw |08 and nut |83, and turning the stud |82, the desired r relative adjustment of the sections 888L and 86b may be effected. rEhe sections may then be locked in adjusted position by tightening the screw |08 and nut |83.

As shown in Figure 5, the front end of the bar section 85a extends alongside the end of the upper abutment 35 previously referred to. The bar section 88a is provided with guide studs |04 extending respectively above and below the abutment 35, and is formed with a horizontally extending rear |85 which engages the side of the frame A for guiding the bar section 86 and maintaining it against displacement away from the adjacent end of the abutment 35.

When the parts are in the normal positions shown in Figure 1, an upstanding projection |06 at the front of the bar 86 is positioned under, and in contact with, the substantially fiat horizontal surface under the nose of a retaining device comprising a, pawl |91 mounted to rock on a nxed frame pivot |88. The pawl nose is formed with a surface |88 inclined to the direction of oscillation of the bar 85 and adapted to engage a similarly inclined surface on the projection |06 when the bar 85 is in its shifted position as shown in Figure 3, the pawl thus tending to maintain the bar 85 releasably in its shifted position. For urging the pawl |91 to the retaining position shown in Figure 3, a spring I l0 is interposed between a tail I|| on the pawl and a holding or locking part, as shown a dog ||2, pivoted at ||3 on a bracket I |4 secured to the cross bar |62. The spring |I urges both the pawl |01 and the dog I2 clockwise. The dog II2 normally is held in the retracted position shown in Figure 1 by engagement of the shift key extension or blocking part 58 with an ear or blocking part ||5\on the dogl I2.

In operation, when the key E is depressed, the extension 58 retreats from the part ||5 of the dog I I2, thereby enabling the dog to rock clockwise into the position shown in Figure 3 as soon as the pawl |01 has moved to its Figure 3 position consequent upon sliding of the projection |06 under the pawl |01 and to the left of the pawl inclined surface |09. Thus, when the shift actuator 15, 86 has been moved forwardly by the actuating mechanism D, it will .be locked or retained in its shifted position by the pawl |01 the holding tendency of which will be supplemented by the dog I I2 when the lower end of the dog engages the pawl and prevents it from rocking counterclockwise to release the projection |66. When the shift key E is released so as to permit its returning spring 68 to raise it, the key extension 58 presses against the ear ||5 and rocks the dog I|2 clear of the top of the pawl |91, thus releasing the pawl for counterclockwise pivotal movement. The similar inclinations of the pawl nose surface |09 and of the engaging part of the projection |06 on the bar 86 are such that these mutually engageable parts constitute cam means by which the pawl |01 is cammed counterclockwise under the urge of the counterbalancing springs I2, which constantly tend to pull the bar 86 rearwardly and shift the segment `4 to lower case position. Preferably, the lower end of the dog ||2 and the top surface of the pawl |01 are notched or cut away so as cooperatively to limit the clockwise movement of the dog I|2 when it is rocked to the holding position shown in Figure 3.

As previously stated, it is necessary to retract the anti-vibration dog 24 from its engagement with the spring 2| prior to shifting the segment 4 downwardly to its upper case position. In the form shown in Figures 1 to 5, mechanismfor accomplishing this purpose includes an ear ||6 extending upwardly from the locking bar section 86h. A wire link |I1 is pivoted as at |18 to the ear I|6 and as at ||9 to the dog 24. When the locking bar 8B is moved initially forwardly, the link ||1 rocks the dog 24 counterclockwise so as to release the segment 4 for its shifting movement which begins later in the cycle after the taking up of the lost motion at the pivotal connection 16. As shown, the link ||1 is of a wellknown adjustable form.

The embodiment of the invention shown in Figures 1 to 5, inclusive, also comprises mechanism for locking the shift key structure E in its depressed position. y The shift key lock lever 54, previously referred to, is pivoted as at |20 on the left-hand shift key lever 53 and is formed with a depending part |2| having spaced stop ears |22 engageable respectively with opposite sides Yof the key lever 53. A tail |23 on the shift lock key lever 54 projects under the heel |24 of a latching dog |25 pivoted as at |26 on the shift key lever 53. A spring |21, interposed between the lower end part of the latching dog |25 and the shift key lever 53, urges the latching dog |25 counterclockwise toward the normal position in Figure 1,

and thereby urges the shift key locking lever 54 clockwise to its normal position. The lower end of the dog |25is formed with a nose |28 which 10 normally is disposed clear of, but which is adapted to engage under, a keeper |29 mounted on the frame.

In operation, when the shift key lock lever 54 is depressed, the latching dog |25 is rocked clockwise to bring its nose 28 against the rear face of the keeper |29, and the entire shift key structure E is depressed until the nose |28 passes below and then projects under the keeper 29. When the finger pressure on the shift lock key 54 is removed, the shift key structure E is held in its depressed position by engagement of the nose |28 with the keeper |29, as shown in Figure 3. In order to return the parts to lower case positions, the shift key lever 53 is depressed so as to move the nose |28 of the latching dog out of contact with the keeper |29. This will enable the spring |21 to rock the latching dog |25 counterclockwise so that, upon relieving the pressure on the shift key lever 53, the entire key structure E will be returned to its normal or lower case position by the spring 68.

Figures 6 to 9, inclusive, show a typewriter embodying a caseshifting mechanism generally the same as the mechanism -described with reference to Figures 1 to 5, inclusive, and also a repeat typing mechanism, only a part of which is shown in Figure 1. The case shifting mechanism included in the embodiment shown in Figures 6 to 9 is so similar to the mechanism described with reference to Figures 1 to 5 that no repeated detailed description of the mechanism shown in Figures 6 to 9, inclusive, is believed to be necessary. Some of the parts of the case shifting mechanism shown in Figures 6 to 9, inclusive, are identical to corresponding parts described with reference to Figures 1 to 5, inclusive, and are designated by the same reference characters. Other parts of the case shifting mechanism shown in Figures 6 to 9, inclusive, which differ from the mechanism shown in Figures l to 5, inclusive, mainly as to form will be referred to briefly. 'i

Figure 6 shows a portion of a case shift actuator |30 which corresponds to the actuator 29 shown in Figure 1. 'I'he actuator |30 is pivoted at I3| to a combined pull link and shift locking bar or case shift actuator and retainer |32 which corresponds to the link 15 and the bar 86 in the formA shown in Figures 1 to 5, inclusive. The bar |32 is formed in one piece and is not adjustable as to length except by mauling or bending. Such a unitary bar may be used with good results when manufactured to close tolerances. The rear end of the bar |32 is connected tothe shift arm 8, preferably by a cushion lever device, not shown in Figure 6, but which may be of the kind shown in Figure 1. The front end of the bar |32 rides on top of the abutment 35 instead of having guide lugs corresponding to the lugs |04 in the construction shown in Figures 1 to 5, inclusive. The projection |33 on the front end of the bar |32 is rounded, and the cooperating locking pawl |34 has its tail |35 extending more forwardly than the tail of the pawl |01 shown in Figures 1 to 5, inclusive` The holding dog` |36 is pivoted as at |31 on a bracket |36 extending rearwardly from a fixed frame part instead of downwardly, as does the bracket I4 shown in Figures 1 and 3.

A further difference between the constructions shown in Figures 1 to 5, inclusive, and in Figures 6 to 9, inclusive, is that in the latter form the shift lock dog 24 is operated directly by key effort instead of by the shift actuator I36. As shown in Figures 6 and '1, the shift key structure 11 E is formed with a projection |39 connected to the dog 24 by a link |40 which is pivoted to the projection |39 as at |4|, and is pivoted to the dog 24 as at |42.

The shift mechanism actuator |30 shown in Figure 6 is equipped with an interponent pawl and trigger and associated elements not shown, but which correspond to the interponent pawl 45, trigger 48, and associated elements shown in Figure 1. It will be apparent that the operation of the case shift mechanism, per se, under the control of the shift key structure E is essentially the same as the operation of the mechanism shown in Figures 1 to 5, inclusive.

Mechanism shot-.n in Figures 6 to 9 for effecting repeated typing operations of the typing member 21 includes a single tooth interponent |43 and associated mechanism corresponding to the interponent 45 and associated mechanism shown in Figure 1. r[he interponent |43 is pivotally mounted as at |44 on an actuator |45 which, in turn, is pivoted as at |46 to a lever |41 mounted to rock on a nxed frame pivot |48 on a cross bar |45. The upper end of the lever |41 is pivoted at |50 to a wire link |5|, the rear end of which is pivoted at |52 to the heel |53 of the typing member 21.

The interponent |43 is formed similarly to the interponent 45 so as to have a holding surface |54 and a re-setting cam surface |55. terponent |43 is controlled by a trigger |56 pivotally mounted on the actuator |45 as at |51. When the trigger |56 is rocked clockwise so as to release the interponent |43, the latter will be driven by the snatch roll 28 so as to move the assembly constituted by the interponent |43, trigger |56, and actuator |45 forwardly, rock the lever |41 forwardly, pull the link |5| forwardly, and thus move the type bar 21 to printing position.

The actuator |45 and interponent |43 have relatively adjustable parts |58 and |59, respectively, for Varying the driving effort transmitted to the type bar 21. In other respects the parts of the mechanism D shown in Figure 6 are generally similar to parts embodied in the construction shown in Figures l to 5, inclusive, so that no more detailed description of the mechanism D shown in Figure 6 is considered necessary.

As previously stated, the type bar 21 is provided with a lower case character 21a and an upper case character 21io which, in the form described, is an underlining character. In accordance with the invention, mechanism is provided for effecting a single type impression by the character 21b or, alternatively, to effect automatically repeated impressions by the underlining character 21h. In accordance with a further feature of the invention, the movement of the segment 4 to upper case position and the automatic repeated operation of the type bar 21 may be eifected by depression of a single key or other manually manipulatable element, or alternatively typing member 21b may be caused to perform a single typing operation by depressing another key when the segment 4 has been shifted to upper case position by depression of the shift key structure E.

The mechanism for effecting single operations of the type bar 21 includes a key lever |66 pivoted on a xed part of the frame as at |88. An upward extension |61 on the rear end of the key lever |60 projects behind the depending arm |62 of a lever |63 pivoted at 6| on the frame cross bar 62. Pivoted at |84 on another arm |65 of the lever |53 is a limber dog or flipper |66 urged The inclockwise by a spring |61 but limited in its clockwise movement by a stop ear |68 on the level' arm |65. The lower end of the ilipper |66 is disposed above a contact ear |69 on the type bar actuator |45 previously referred to. A spring |10 is interposed between the key lever |60 and an arm |1| on the lever |63 for normally maintaining the parts in the positions shown in Figure 6.

In operation, when the single impression character key lever |68 is depressed the lever |63 is rocked clockwise, causing the ipper |66 to engage the actuator ear |69 and move the actuator |45 downwardly until its associated trigger |56 is rocked to pawl-releasing position by engagement with the lower abutment 38. The pawl or interponent |43, having been thus released, will move into engagement with the snatch roll 23 so as to be driven forwardly together with the actuator |45, thus rocking the lever |41 and actuating the type bar 21 through the link connection |5|. When the interponent |43 has been cast off the snatch roll 28 the parts will return to their normal positions even though the key |60 be held depressed so that only a single actuation of the type bar 21 will take place. For a more detailed description of the sequence of operation of the parts for actuating the type bar 21, reference is made to the detailed description of the analogous operation of the interponent 45 and its associated parts shown in Figure 1.

It will be understood that the operation of the type bar 21 effected by depression of the key |60 is independent of operation of the case shifting mechanism and its associated controlling devices. Thus the type bar 21 can be caused to perform a single typing operation regardless of the position in which the y.type bar segment 4 is set. Moreover, the case shift mechanism may be operated by depressing the key structure E without operating the type bar 21.

It is, however, a further feature of the invention that the case shifting mechanism and the mechanism for operating the type bar 21 may be articulated so as to be operated under the control of a single manually manipulatable element rst to shift the segment 4 to upper case position, and then automatically to eiiect repeated operations of the type bar 21 as long as the manipulatable element is held in manipulated position. Such an arrangement has particular advantages when the type bar 21 has an upper case underscoring character as shown at 21b in Figure 1.

In the form shown, a combined case shift and repeat typing operation key lever |12 has its front arm |13 extending through a slot |14 in the front wall of the typewriter mask or cover. The lever |12 is pivoted as at |15 and has a rearwardly extending arm |16 pivoted at |11 to the upper end of a link |18, the lower end of which is pivoted at |19 to the rear end of a lever |80 pivoted at |08. A link |8| is pivoted at |82 to the lever |86 and is pivoted at |83 to an arm |84 fixed to a rock shaft |85. A link member is pivoted at |81 to another arm |84a fixed to the shaft |85, and extends upwardly with its upper end part being connected to the type bar actuator |45 by a pin and slot one-way-acting motion transmitting connection |88. The arrangement is such that when the link member |86` is moved downwardly the actuator |45 is lowered so as to eiect releasing of the pawl |43 by the trigger |56 and consequent driving engagement of thepawl with the snatch roll 2S. However, when the link |86 is not moved, the actuator |45 may still be moved downwardly by the key |60, lever |63 and flipper |66' in the manner previously described.

Normally, the lever |12, the link |86 and the intervening connections are in the positions shown in full lines in Figure 6 with a stop part |89 engaging a xed frame part |90 so as to determine the unactuated positions of the parts. In order to effect repeated operation of the type bar 21, the key |12 is depressed to the dotted line position shown in Figure 6 which is determined by engagement of a stop part |9| with the xed frame part |90. Depression of the key |12 lifts the link |18 so as to rock the lever |80 counterclockwise, lift the link |8|, rock the movable part constituted by the arms |84 and |848, and the shaft |85 clockwise, and move the link |86 downwardly to lower the actuator |45. Lowering of the actuator |45 causes the trigger |56 to engage the lower abutment 38 and be rocked to interponent-releasing position, whereupon the interponent |43 engages the snatch roll 28 and is driven forwardly together with the actuator |45 to operate the type bar 21. During the forward movement of the actuator |45, the link |86 will rock clockwise about its pivot |81. When the interponent |43 is cast off the snatch roll 28 the actuator |45 will return or move rearwardly while the link |86 rocks clockwise and continues to hold the actuator down so as to prevent engagement of the trigger |56 with the upper abutment 35. Consequently, the trigger |56 will not be rocked to re-set the pawl |43, and the latter will re-engage the snatch roll 28, and will again be driven forwardly to effect another operation of the type bar 21. Repeated cycles or operations of the actuator and type bar will take place in this manner as long as the key |12 is held depressed with consequent holding of the link |86 in its lowered position.

In order that the machine may be conditioned for typing the upper case character 21b when repeated operation of the type bar 21 is effected by depressing the key |12, a one-way-acting connection is provided for depressing the shift key structure E when the key lever |12 is actuated. In the form shown, the lever |80 has a rounded front end |92 normally disposed above a contact part |93 on the case shift lever 53. The contact part |93 is formed with high points |94 and |95 and an intervening recessed part |96 which is substantially concentric with the pivot |08 when the parts are in their normal positions.

In operation, when the lever |80 is rocked counterclockwise by manipulation of the key lever |12, the rounded end or bearing part |92 engages the high point |94 on the contact or bearing part |93 and transmits force from the repeat key |12 to the shift key so as to rock the shift key lever 53 downwardly concomitantly with depression of the key |12 to thus effect shifting of the segment 4 to its upper case position in the manner previously described. When the key lever |12 and associated parts are in their completely actuated positions, the rounded end |92 of the lever |80 will be in contact with the recessed part |96 of the contact member |93 so as to hold the shift key lever 53 depressed with the application of minimum finger pressure on the key lever |12. The yparts are so proportioned and related and the timing of the mechanism is such that when the key lever |12 is depressed the shift mechanism will move the segmentfd toits upper case position before the type bar 21 arrives in printing position on its first stroke.

The case shift mechanism shown in Figures 1 to 5, inclusive, is intended for use in connection with the repeat type bar operating mechanism described with reference to Figure 6. However, to avoid undue complication of the drawings, Figure 1 shows only a part ofthe repeat type bar operating mechanism as including the lower end of the link |8|, the shaft |85, the rock arms |84 and |845, all of which have been described with reference to Figure 6.

Figures 10 to 12, inclusive, illustrate a modied construction which, like the forms previously described, includes a single manipulatable member for effecting case shifting operation and automatically repeated type bar operation. The mechanism for articulating the case shift mechanism and repeat typing mechanism differs somewhat from the articulating mechanism previously described and will be explained in some detail. However, the shift mechanism shown in Figures 10 to 12, inclusive, and the repeat typing mechanism shown in these figures, considered alone, are so generally similar to the shift mechanism and repeat typing mechanism described above that a brief description of the shift mechanisms and the repeat typing mechanisms will sufce. Generaly stated, parts of the case shifting mechanism and the repeat typing mechanism shown in Figures 10 to 12, inclusive, are designated by the same reference numerals as those designating corresponding parts previously described, the numerals designating these parts in Figures 10 to 12, inclusive, however, being primed. Thus, the snatch roll 28 shown in Figure 10 corresponds to the snatch roll 28 shown in Figures 1, 3 and 6, the shift actuator |30' shown in Figures 10 to 12, inclusive, corresponds to the shift actuator |30 shown in Figure 6, the repeat typing actuator shown in Figures 10 to 12, inclusive, corresponds to the actuator |45 shown in Figure 6, and so on. It may be observed that some of the parts shown in Figures 10 to 12 differ in specific construction from the corresponding parts shown in the figures described previously, but not in such manner as to affect the basic combination or mode of operation of the parts. For exampley the interponent pawls |43 and 45', shown in Figures 10 to 12, differ from their counterparts |43 and 45 by having ears |91 and |98 engageable with depending parts |99 and 200 of their associated actuators. The ears 91 and |98 project horizontally and may be bent or adjusted to vary the extent to which the associated interponents or pawls move into the tooth interspaces in the snatch roll, thus serving the same purpose as the relatively adjustable parts 12-13 in Figure 1, and |58|59 in Figure 6. Other minor differences in construction observable in Figures 10 to 12, inclusive, lneed not be described.

The means for articulatingthe case shiftingand repeat typing mechanisms shown in Figures 10 to 12, inclusive, comprises a lever 20| extending longitudinally of and in front of the machine and being pivoted as at 202 on the machine frame. An arm 203 of the lever 20| is equipped with a key button 204, the other arm 205 of the lever 20| being pivoted as at 206 to the upper end of a link 201, the lower end of which is pivoted as at 208 to a lever 269 mounted to rock on a pivot 52. The rear end of the lever 209 is pivoted at 2|8 to the lower end of a link 2| I, the top of which has a pin and slot one-way-acting'connection at 2l2 with the type bar actuator |45.

In operation, when the key 204 is depressed the lever is rocked to lift the link 201, rock the lever 209, and move the link 2 ll downwardly so as to effect engagement of the interponent pawl |43' with the snatch roll 28', resulting in operation of the actuator |45' and type bar 21. Having in mind the previous description, it will be understood that the type bar 2T will be operated repeatedly as long as the key 204 is held depressed.

In order that the key 204 may also effect operation of the shifting mechanism, a thrust link 2l3 is pivoted at 2|4 to the arm 203 of the key lever 20|, and has its lower end formed with a fork 2i5 which receives the rod 55 joining the shift key levers 53. The fork 215 and rod 55 provide a one-way-acting connection for transmitting depressing movement of the key 204 to the shift key E'. When the lever 20| is rocked by depressing the key 204, the link 2|3 is moved downwardly so as to push the rod 55' and depress the shift key structure E. Engagement of the shift mechanism interponent 45 with the snatch roll 28 and consequent operation of the shift mechanism will then ensue in the manner previously described.

Although modications of structures embodying the invention have been illustrated, they have, as common advantages, a lightness of the finger pressure required for effecting case shifting and maintaining the shiftable element in shifted position, and the flexibility of operations permitted by the novel means articulating the case shifting mechanism and the repeat typing mechanism. Thus, in machines embodying the invention, the shiftable element may be operated alone, or together with therepeat typing mechanism to effect continuous typing by an .upper case character, or the same upper-case character may be typed only once.

The constructions described with reference to the accompanying drawings embody the invention in preferred forms, but it is intended that they be considered as illustrative rather than definitive of the invention. The invention is defined in the claims.

I claim:

l. In a power operated typewriting or like machine, a case shift element; a power driven member; a case shift actuator; means connecting said actuator to said element; a shift key; means operable by said key for effecting driving of said actuator and said element to shifted positions by said member; a retaining device movable from a normally inactive position to a position of engagement with said actuator in which position said device is adapted to be held for retaining said actuator in its shifted position; a holding part movable from a normally inactive position towards a position of engagement with said retaining device in which position said part holds said device in retaining engagement with said actuator; and means associated with said key and normally maintaining said holding part out of operative engagement with said retaining device but being movable by said key to release said holding part and enable it to move into holding engagement with said retaining device when said key is in actuated position.

2. In a power operated typewriting or like machine, a case shift element; a power driven member; a case shift actuator; means connecting said actuator to said element; a shift key; means operable by said key for effecting driving of said actuator and said element to shifted positions by said member; a retaining device spring-urged to move from a normally inactive position to a posi tion of engagement with said actuator in which position said device is adapted to be held for retaining said actuator in its shifted position; a holding part spring-urged to move from a normally inactive position towards a position of engagement with said retaining device in which position said part holds said device in retaining engagement with said actuator; and means associated with said key and including a blocking part normally maintaining said holding part out of operative engagement with said retaining device but being movable by said key to release said holding part and enable it to be moved by spring urge into holding engagement with said retaining device when said key is in actuated position.

3. In a power operated typewriting or like machine, a case shift element; a power driven member; a case shift actuator; means connecting said actuator to said element; a shift key; means operable by said key for effecting driving of said actuator and said element to shifted positions by said member; a retaining device movable from a normally inactive position to a position of engagement with said actuator in which position said device is adapted to be held for retaining said actuator in its shifted position; a holding part movable from a normally inactive position towards a position of engagement with said retaining device in which position said part holds said device in retaining engagement with said actuator; a spring connected respectively to said retaining device and said holding part and urging said retaining device towards its position for retaining said actuator in its shifted position, and urging said holding part towards its position of engagement with said retaining device; and means associated with said key and normally maintaining said holding part out of operative engagement with said retaining device but being movable by said key to release said holding part and enable it to be moved by said spring into holding engagement with said retaining device when said key is in actuated position.

4. In a power operated typewriting or like machine, a case shiftl element; a power driven member; a case shift actuator; means connecting said actuator to said element; a shift key; means operable by said key for effecting driving of said actuator and said element to shifted positions by said member; a projection on said actuator; a pivoted retaining pawl having a surface slidably engaged by said projection during operation of said actuator and a nose adapted to move into locking engagement with said projection when said actuator has moved to its completely shifted position wherein said projection has moved clear of said pawl surface; a pivoted holding dog normally operatively disengaged from said pawl; means biasing said pawl into engagement with said projection and biasing said dog into operative engagement with said pawl when the pawl nose is in locking engagementl with said projection for holding said pawl nose in locking engagement with said projection; and a blocking part normally maintainingr said dog operatively disengaged from said pawl but being operable in response to actuation of said key for enabling said biasing means to move said dog into operative engagement with said pawl.

5. In a power operated typewriting or like machine, a case shift element; a power driven meinber; a case shift actuator; means connecting said actuator to said element; a shift key; means operable by depression of said key for effecting driving of said actuator and said element to shifted positions by said member; means controlled by said key upon raising thereof for eifecting re turning of said actuator and said element to their non-shifted positions; a retaining device movable from a normally inactive position to a position of engagement with said actuator in which position said device is adapted to be held for retaining said actuator in its shifted position, the mutually engageable parts ofA said retaining device and said actuator comprising cam means operabie by said actuator returning means when said device is not held for camming said device out of retaining engagement With said actuator; a holding part movable from a normally inactive position towards a position of engagement with said retaining device in which position said part holds said device in retaining engagement with said actuator; and means associated with said key and normally maintaining said holding part out of operative engagement With said retaining device but being movable by said key to release said holding part and enable it to move into holding engagement with said retaining device when said key is in actuated position, and being movable by raising of said key for moving said holding part out of operative engagement with said retaining device.

5. In a power operated typewriting or like machine, a case shift element; a power driven member; a case shift actuator; means mounting said actuator for oscillation, said actuator being formed with a first surface extending generally in the direction of oscillation and a second surface inclined with respect thereto; means connecting said actuator to said element; a shift key; means operable by said key for effecting driving of said actuator and said element to shifted positions by said member; means for returning said actuator and said element to their normal nonshifted positions; a pivoted pawl having a first surface normally engaging said rst actuator surface and extending generally in the direction of oscillatory movement thereof and having also a retaining surface inclined with respect to said direction of oscillator movement; means so biasing said pawl as normally to hold its said rst surface in engagement with said actuator first surface and being adapted to rock said pawl when said actuator first surface moves beyond said pawl rst surface consequent to shifting of said actuator so as to bring said pawl into actuator-retaining position with said pawl and actuator inclined surfaces in engagement with each other, the pawlbiasing means however being in itself insufficiently strong to resist displacement of said inclined pawl surface from engagement with said actuator inclined surface by the camming action of saidl surfaces upon each other under the urge of said actuator returning means; a holding dog normally operatively disengaged from said pawl; and means responsive to movement of said key to shift-effecting position for moving said dog into engagement with said pawl for holding said pawl. in said actuator-retaining position as long as said key is held depressed.

, 7. In a power operated typewriting or like machine, a case shift element; a power driven member; a case shift actuator; means connecting said actuator to said element; a shift key; means operable by said key for effecting driving of said actuator and said element to shifted positions by said member; means for returning said actuator and said element from shifted to non-shifted positions; a retaining device movable from a 'normally 8. In a power operated typevvriting or like machine, a case shift element; a power driven member; case shift actuator; a shift lock for 'normally holding said element in normal, non-shifted position; means connecting said lock to said actuator to be operated thereby to non-locking position to enable said element to be shifted; meansy connecting said actuator to said element; a shift key; means operable by said key for effect-ing driving of said actuator and said element to shifted positions by said member; a retaining device movable from a normally inactive position to a position of engagement with said actuator in which position said device is adapted to be held for retaining said actuator in its shifted position; a holding part movable from a normally inactive position towards a position of engagement with said retaining device in which position said part holds said device in retaining engagement with said actuator; and means associated with said keyand normally maintaining said holding part out of operative engagement with said retaining device but being movable by said key to release said holding part and enable it to move into holding engagement with said retainincr device when said key is in actuated position.

9. In a power operated typewriting or like machine, a case shift element; a power driven member; a case shift actuator; a shift lock for normally holding said element in normal, non-shifted position; means connecting said actuator to said element; a shift key; means operable by said key for moving said lock to non-locking position to enable said element to be shifted and for effecting driving of said actuator and said element to shifted positions by said member; a retaining device movable from a normally inactive positiontc a position of engagement with said actuator in which position said device is adapted to be held for retaining said actuator in its shifted position; a holding part movable from a normally inactive position towards a position of engagement with said retaining device in which position said part holds said device in retaining engagement with said actuator; and means associated with said key and normally maintaining said holding part out of operative engagement with said retaining device but being movable by said key to release said holding part and enable t-o move into holdf ing engagement with said retaining device when said key is in actuated position.

l0. Ina power operated typewriting or like machin,"`a case shift element; a power driven member; a case shift actuator; cushioned drivetransmitting connections between said actuator and said element comprising a first lever'connected to said element, a second lever pivotally' mounted with respect to said first lever, a force'- transniitting'spring connecting said levers, and means connecting said second lever to 'said acatea-vvv tuator; a shift key; 'means operable by said key for effecting driving of said actuator and said element to shifted positions; a retaining device movable from a normally inactive position to a position of engagement with said actuator in which position said device is adapted to be held for retaining said actuator in its shifted position; 'a holding part movable from a normally inactive position towards a position of engagement with said retaining device in which position said part holds said device in retaining engagement with 'said actuator; and means associated with said key and normally maintaining said holding part out of operative engagement with said retaining device but being movable by said key to release said holding part and enable it to move into holding engagement with said retaining device when said key is in actuated position.

'11. In a power operated typewriting or like machine, a case shift element; a power driven member; a case shift actuator; cushioned drivetransmitting connections between said actuator and said element comprising a first lever connected to said element, a second lever pivotally mounted with respect to said rst lever, a forcetransmitting spring connecting said levers, and means connecting said second lever to said actuator; a shift key; means operable by said key for effecting driving of said actuator and said element to shifted positions; means for returning said actuator and said element from shifted to non-shifted positions; a retaining device movable from a normally inactive position into a position in which it tends to prevent return movement of the actuator but insuiciently, in itself, to prevent such movement; a normally ineffective holding part; and means responsive to operation of said key and resultant shifting of said actuator and said element for rendering said holding part effective to supplement said tendency of said retaining device whereby said actuator and said element are held in shifted positions jointly by said retaining device and said holding part as long as said key is held in operated position.

12. In a power operated typewriting or like inachine, a case shift element; a power driven member; a case shift actuator; means connecting said actuator to said case shift element; an interponent mounted on said actuator for movements into and out of operative engagement with said driven member and being biased into engagement therewith; a trigger normally maintaining said interponent disengaged from said driven member; a shift key; means responsive to depression of said key for actuating said trigger to release said interponent and enable it to move into engagement with said driving member, whereby said actuator will be driven by said driven member so as to operate said case shift element; trigger re-setting means effective upon return movement of said shift key when said driven member is stationary for moving said trigger reversely to its releasing movement and thereby disengaging said interponent from said driving member; means for returning said actuator and said element from shifted to non-shifted positions; a retaining device movable from a normally inactive position into a position in which it tends to prevent return movement of the actuator but insuiiiciently, in itself, to prevent such movement; a, normally ineffective holding part; and means responsive to operation of said key and resultant shifting. ofY said actuator and said element for rendering. said holdingv part effective to supplement. 'said' tendency. of said retaining device 20 whereby said actuator and said element are held in shifted positions jointly by said retaining device and said holding part as long as said key is held in operated position.

13. In power operating mechanism for a typewriting or like machine, a typing member; a power-driven member; an actuator; means cont necting 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 mounted on said actuator and normally maintaining said interponent disengaged from said driven member, said actuator, interponent, and trigger constituting an assembly of conjointly movable parts; a typing control mechanism including an element manipulatable for actuating 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; and means for then returning said actuator towards Aits normal non-actuated position, said typing control mechanism including means comprising a member operable by said manipulatable element and being connected to and having a part movable with said assembly during operating movements of said assembly for maintaining said trigger in actuated, interponent-releasing position when said manipulatablc element is held in manipulated 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 member.

14. 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 mounted on said actuator and normally maintaining said interponent disengaged from said driven member, said actuator, interponent, and trigger constituting an assembly of conjointly movable parts; a typing control mechanism including an element manipulatable for actuating 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; means for then returning said actuator towards its normal non-actuated position, said typing control mechanism including means comprising a member operable by said manipulatable element and being connected to and having a part movable with said assembly during operating movements of said assembly for maintaining said trigger in actuated, interponent-releasing position, when said manipulatable element is held in manipulated position, whereby, during returning of said actuator towards its normal "non-actu! ated position, said interponent will re-engage said A'driven membei` to be repeatedly driven thereby for effecting repeated driving of said actuator and repeated typing operations of said typing member; and trigger-resetting means responsive to returning of said manipulatable element to normal, non-manipulated position for moving said trigger reversely to its releasing movement and thereby returning said interponent to its normal position on said actuator.

15. 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 y; 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 pivotally mounted on said actuator and normally maintaining said interponent disengaged from said driven member, said actuator, interponent, and trigger constituting an assembly of conjointly movable parts; a re-setting cam face on said interponent; a typing control mechanism including an element manipulatable for actuating 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 Y.

then returning said actuator towards its normal non-actuated position, said typing control mechanism including means comprising a member operable by said manipulatable element and being connected to and having a part movable with said assembly during operating movements of said assembly for maintaining said trigger in actuated, interponent-releasing position when said manipulatable member is held in manipulated 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 therebyfor effecting repeated driving of said actuator and repeated typing operations of said typing member; and means responsive to returning of said manipulatable element to normal, non-manipulated 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.

16. 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 link pivotally connected at one of its ends to said actuator, a movable part to which the other en d oi said link is pivotally connected, and a manipulatable element for moving said movable part, said link, and said actuator to actuate said trigger to release said interponent and enable it to move into engagement with said drivenj member 22Y 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 means for then returning said actuator towards its normal non-actuated position, saiwlink, when held in the position to which it is moved by said manipulatable element and said part movable thereby, holding said actuator and interponent in position for reengagement of said interponent with said driven member when said actuator is being returned toward its non-actuated position, thereby effecting repeated driving of said actuator and said typing member by said driven member while said manipulatable member is held in manipulated position.

17. In power operating mechanism for-a type- Writing or like machine, a typing member; a rotatable driven member; a movably mounted ac-h tuator; 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 oi drive-transmitting engagement with said driven member, said actu-` ator, interponent, and trigger constituting an assembly of conjointly movable parts; an abutment; 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 drivetransmitting engagement with said driven member, whereby said actuator will be driven through said interponent until the latter isthrown 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 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 key controlled means including mechanism comprising a'member connected to and having a part movable with said assembly during operating movements of Said assembly for preventing engagement of said trigger with said second abutment as long as said key-controlled means is in operated position.

18. In power operating mehanism 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, said actuator, interponent, and trigger constituting an assembly of conjolntly movable parts; an abutment; keycontrolled 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 drivetransmitting engagement with said driven me nber, whereby said actuator will be driven through said interponent until the latter is thrown out oi engagement with said driven memblr; means for urging said actuator to move reversely to the direction in which it was moved by said keycontrolled means and reverseiy to the direction in which it was driven by said driven member; a second abutment engageable by said trigger when said actuator is moved reversely to the direction in which it was moved by said key-controlled means for returning said trigger to its initial position on said interponent; and means assoelated with said trigger and said key-controlled means including mechanism comprising a member connected to and having a part movable with said assembly during operating movements of said assembly and being eiective as long as key-controlled means is in actuated condition for preventing said actuator from moving reversely to the direction in which it was moved by said key-controlled means while permitting said actuator repeatedly to move alternately in the direction in which it is driven by said driven member and reversely thereto, whereby to effect repeated engagement and disengagement of said interponent and said driven member with consequent repeated operation of said typing member.

19. 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 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; 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 thrown out of engagement with said driven me.A ber; means for urging said actuator to move reversely to the direction in which it was moved by said key-controlled means and reversely to the direction in which it was driven by said driven member; a second abutment engageable by said trigger when said actuator is moved reversely to the direction in which it was moved by said key-controlled means for returning said trigger to its initial position on said interponent; and means associated with said trigger and said interpcnent for returning said interponent to its normal position on said actuator when said trigger is returned to its initial position on said actuator, said key-controlled means including a lever, a link pivotally connected at its opposite ends respectively to said actuator and to said lever, and key-operated means for rocking said lever and thus moving said link and said actuator, said link being effective as long as said key-operated means is in actuated condition for preventing said actuatorfrom moving reversely to the direction in which it was moved by said key-controlled means while permitting said actuator repeatedly to move alternately in the direction in which it is driven by said driven member and reversely thereto, whereby to efect repeated engagement and disengagement of said interponent and said driven member with consequent repeated operation of said typing member.

20. ln a power operating mechanism for a typewriting or like machine, a typing member; a rotatable driven member; a movably mounted actuator extending transversely to the axis of rotation of said driven member and having a part thereon normally disengaged from said driven member but being engageable therewith upon being moved relatively toward said driven member for effecting driving of said actuator by said driven member; means operatively connecting said actuator to said typing member; a key-operated lever; and a link extending substantially transversely to the direction of driving of said actuator by said driven member and being pivotally connected at its opposite ends respectively to said lever and to said actuator for moving said actuator relatively towards said driven member to eiiect engagement of said part on said actuator with said driven member and for holding said actuator against reverse movement relatively away from said driven member while permitting said actuator to be driven by said driven member repeatedly as long as said lever is in key-operated position.

21. In a power operating mechanism for a typewriting or like machine, a typing member; a rotatable driven member; a movably mounted actuator extending transversely to the axis of rotation of said driven member and having a part thereon normally disengaged from said driven member but being engageable therewith upon being moved relatively toward said driven member for erecting driving of said actuator by said driven member; means operatively connecting said actuator to said typing member; a single impression character key; key-actuated means operable by depression of said key for moving said actuator towards said driven member to effect engagement of said part on said actuator with said driven member whereby said actuator is driven by said driven member to effect a single typing stroke of said typing member, said keyactuated means including a part mounted to yield if said single impression character key is held depressed following driving of said actuator by said driven member so as not to interfere with returning of said actuator to its normal position after being driven by said driven member; a repeat key; means including a pivoted link operable by said repeat key; a cne-way-acting connection between said link and said actuator for transmitting motion from said link to said actuator for moving said actuator toward said driven member to bring said part on said actuator into engagement with said driven member and for holding said actuator against reverse movement away from said driven member while permitting said actuator to be driven repeatedly by said driven member as long as said repeat key is held in operated position, said single impression character key and said repeat key being operable optionally for effecting single or repeated operation of said actuator, said one-way-acting connection enabling said actuator to be moved tcward said driven member without being restrained by said link when said single impression character key is operated.

22. In a power operating mechanism for a typewriting or like machine, a typing member; a

25 rotatable driven member; a mcvably mounted actuator extending transversely to the axis of rotation of said driven member and having a part thereon normally disengaged from said driven member but being engageable therewith upon being moved relatively toward said driven member for effecting driving of said actuator by said driven member; means operatively connecting said actuator to said typing member; a single impression character key; key-actuated means operable by depression of said key for moving said actuator towards said driven member to effect engagement of said part on said actuator with said driven member whereby 4said actuator is driven by said driven member to effect a single typing stroke of said typing member, said key-actuated means including a part mounted to yield if said single impression character key is held depressed following driving of said actuator by said driven member so as 'not to interfere with returning of said actuator to its normal position after being driven by said driven member; a repeat key; means including a pivoted link operable by said repeat key; a pin-andslot connection between said link and said actuator for transmitting motion from said link to said actuator for moving said actuator toward said driven member to bring said part on said actuator into engagement with said driven member and for holding said actuator against reverse movement away from said driven member while permitting said actuator to be driven repeatedly by said driven member as long as said repeat key is held in operated position, said single impression character key and said repeat key being operable optionally for effecting single o:

repeated operation of said actuator, the slot of said pin-and-slot connection extending in the direction in which said actuator is moved for bringing said part on said actuator into engagement with said driven member, whereby when said single character impression key is depressed said actuator may be moved with the pin of said,

pin-and-slot connection moving idly relatively in the slot thereof, whereby said pin-and-slot connection imposes no restraint on movement of said actuator by depression of said single character impression key.

23. In a power operating mechanism for a typewriting or like machine, a typing member; a rotatable driven member; a movably mounted actuator extending transversely to and above the axis of rotation of said driven member and having a part thereon normally disengaged from said driven member but being engageable therewith upon being moved downwardly toward said driven member for effecting driving of said actuator horizontally by said driven member; means operatively connecting said actuator to said typing member; a key-operated lever mounted above said actuator; a dog pivotally mounted onl said lever and being engageable with said actuator for moving the latter downwardly and being yieldable horizontally so as not to interfere with horizontal movement of said actuator when said key-operated lever is held in operated position; a repeat key; a second lever mounted below said actuator and being operable by said repeat key; a vertically extending link; a pivotal connection between the lower end of said link and said second lever; and a pin-and-slot connection between the upper end of said link and said actuator.

24.1n a power operated typewriter or like.

machine, a case shift element; a typing member having a type character thereon effective forl typing only when said element is in shifted position; a power driven member; a rst actuator operatively connected to said case shift element and normally being disconnected from said power driven member but being connectable therewith for being driven thereby to move said element to shifted position; means including a manually manipulatable shift key operable for effecting connection of said first' actuator to said driven member; means effective when said shift key is in operated position for holding said element in shifted position; a second actuator operatively connected to said typing member and normally being disconnected from said power driven member but being connectable therewith for being driven thereby to operate said typing member; a manually manipulatable repeat key; means responsive to operation of said repeat key and remaining of said repeat-key in operated position for effecting repeated connection of said second actuator with said driven member with consequent repeated power operation of said second actuator by said driven member; and means on said repeat key for operating said shift key when said repeat key is operated.

25. In a power operated typewriter or like machine, a case shift element; a typing member having a type character thereon effective for typing only when said element is in shifted position; a power driven member; a rst actuator operatively connected to said case shift element; a first interponent mounted on said first actuator for movements into and out of operative engagement with said power driven member and being biased to move into engagement therewith; a rst trigger normally maintaining said first interponent disengaged from said power driven member: a second actuator operatively connected to said typing member; va second interponent mounted on said second actuator for movements into and out of operative engagement with said power driven member and being biased to move into engagement therewith; a second trigger normally maintaining said second interponent disengaged from said power driven member; a key; means responsive to depression of said key for actuating both said first trigger and said second trigger to release the respectively associated first and second interponents and enable them to move into engagement with said power driven member to thereby effect power driving of said first and second actuators by said driven member to shift said element and operate said typing member; means effective as long as said key is held depressed for retaining said case shift element in shifted position; and means effective when said key is held depressed for preventing returning of said second trigger and said second interponent to their normal positions on said second actuator, whereby said second interponent will remain positioned on said second actuator for repeatedly engaging and being driven by said power driven member as long as said key is held depressed.

26. In a power operated typewriter or like machine, a case shift element; a typing member having a type character thereon effective for typing only when said element is in shifted position; a power driven member; a first actuator operatively connected to said case shift element and normally being disconnected from said power driven member but being connectable therewith for being driven thereby to move said element to shifted position; a second actuator operatively connected to said typing member and normally being disconnected from said power driven member but being connectable therewith for being 27 driven thereby to operate said typing member; a repeat key; means responsive to depression of said repeat key for effecting connection of said first and second actuators with said power driven member whereby said actuators are operated by said power driven member respectively to shift said case shift element and to operate said typing member; means rendered effective when said first actuator has been operated and being maintained effective as long as said repeat key is held depressed for retaining said case shift element in operated position; and means effective as lone as said repeat key is held depressed for causing repeated operation of said second actuator` by said power driven member.

27. In a power operated typewriter or like machine, a case shift element; a typing member having a type character thereon effective for typing only when said element is in shifted position; a power driven member; a first actuator operatively connected to said case shift element and normally being disconnected from said power driven member but being connectable therewith for being driven thereby to move said element to shifted position; a second actuator operatively connected to said typing member and normally being disconnected from said power driven member but being conne/arable therewith for being driven thereby to operate said typing member; a manually operable shift key; means responsive to depression of said shift key for effecting connection of said first actuator with said power driven member whereby said first actuator will be power operated to shift said shift element; a manually operable second key; means responsive to depression of said second key for effecting connection of said second actuator with said power driven member whereby said second actuator will be power operated to operate said typing member; and a one-way-acting connection for transmitting force from said second key to said shift key for thereby depressing said shift key concomitantly with depression of said second key when the latter is depressed manually, said one-way-acting connection being incapable oi transmitting force from said shift key to said second key.

28. In a power operated typewriter or lik machine, a oase shift element; a typing member having a type character thereon effective for typing only when said element is in shifted position; a power driven member; a first actuator operatively connected to said case shift element and normally being disconnected from said power driven member but being connectable therewith for being driven thereby to move said element to shifted position; a second actuator operatively connected to said typing member and normally being disconnected from said power driven member but being connectable therewith for being driven thereby to operate said typing member; a shift key; means responsive to depression of said shift key for effecting connection of said rst actuator with said power driven member whereby said first actuator will be power operated to shift said shift element; a second key; means responsive to depression of said second key for eecting connection of said second actuator with said power driven member whereby said second actuator will be power operated to operate said typing member; a first bearing part on said shift key; a pivoted lever having a second bearing part normally operatively disconnected from said first bearing part; and means connecting said second key to said lever and operable upon depression of said second key for rocking said lever to cause said second bearing part to bear on said first bearing part and thereby depress said shift key.

29. In a power operated typewriter or like machine, a case shift element; a typing member having a type character thereon effective for typing only when said element is in shifted position; a power driven member; a first actuator operatively connected to said case shift element and normally being disconnected from said power driven member but being connectable therewith for being driven thereby to move said element to shifted position; a second actuator operatively connected to said typing member and normally being disconnected from said power driven member but being conneotable therewith for being driven thereby to operate said typing member; a shift key; means responsive to depression of said shift key for effecting connection of said first actuator with said power driven member whereby said first actuator will be power operated to shift said shift element; a second key; means responsive to depression of said second key for effecting connection of said second actuator with said power driven member whereby said second actuator will be power operated to operate said typing member; an endwise movable thrust link connected at one of its ends to said second key and at its other end being formed with a fork; and a part fast with said shift key and being received by said fork so as to form therewith a one-way-acting connection for transmitting depressing movement of said second key to said shift key but not from said shift key to said second key.

3G. In a power operated typewriter or like machine, a case shift element; a typing member having a type character thereon effective for typing only when said element is in shifted position; a power driven member; a first actuator operatively connected to said case shift element and normally being disconnected from said power driven member but being connectable therewith for being driven thereby to move said element to shifted position; a second actuator operatively connected to said typing member and normally being disconnected from said power driven member but being connectable therewith for being driven thereby to operate said typing member; a manually operable shift key; means responsive to depression of said shift key for effecting connection of said first actuator with said power driven member whereby said first actuator will be. power operated to shift said shift element; a manually operable second key; means 'responsive to depression of said second key for yeifecting connection of said second actuator with said power driven member whereby said second actuator will be power operated to operate said typing member; a one-way-acting connection for transmitting force from said second key to said shift key for thereby depressing said shift key concomitantly with depression of said second key when the latter is depressed manually, said one-way-acting connection being incapable of transmitting force from said shift key to said second key; a third key; means responsive to depression of said third key for effecting connection of said second actuator with said power driven member independently of operation of said second key and irrespective of the operated or non-operated condition of said shift key and said shiftelement; and another type character on said typing member effective for typing when' only said third key has been depressed.

31'.' In a power operated typewriter or like ber but being connectable therewith for 'Y being driven thereby to operate said typing member; a shift key; means responsive to depression of said shift key for effecting connection of saidirst actuator with said power driven member-whereby said first actuatorfwill be power operated to shift said shift elemefit; means controlled said shift key and effectiveas long as said shift 'key is held depressed for maintaining said shift element 20 in shifted position; a'fsecond key; means ijesponsive to depression of 'aid second key foreiecting repeated connection of said second actuator with said power driven member whereby said second actuator will be power operated repeatedly to operate said typing member; a one-` ay-acting connection for transmitting depressing movement from said second key to said shift key but not from said shift key to said second key; a third key; and means responsive to depression of said third key for effecting a single ioperative connection of said second actuator/ with said power driven member independently of operation of said second key. WILLIAM H. KU-PPER.

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

UNITED STATES PATENTS Number Name y Date 1,614,475 Hokanson Jan; 18, 1927 2,043,393 Pasinski June 9, 1936 2,310,717 Sundstrand Feb. 9, 1943 2,387,078 Kurowski Oct? 16, 1945

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