US3044697A - Value selection and entering means for calculating machines - Google Patents

Description

July 17, 1962 H. GANG 3,044,697

VALUE SELECTION AND ENTERING MEANS FOR CALCULATING MACHINES Filed NOV. 7, 1958 4 Sheets-Sheet 1 Q INVENTOR. 5051mm GANG H. GANG July 17, 1962 VALUE SELECTION AND WTERING MEANS FOR CALCULATING MACHINES 4 Sheets-Sheet 2 Filed Nov. "7, 1958 H. GANG 3,044,697 VALUE SELECTION AND EXQTERING MEANS FOR CALCULATING MACHINES July 17, 1962 4 Sheets-Sheet 3 Filed Nov. 7, 1958 INVENTOR. EM

H. GANG July 17, 1962 VALUE SELECTION AND ENTERING MEANS FUR GALCULATING MACHINES 4 Sheets-Sheet 4 Filed Nov. 7, 1958 H INVEN TOR.

ERIKA!!! GANG United States Patent VALUE SELEtITlON AND ENTERING MEANS FUR CALCULATING MACHENES Herman Gang, Morris Plains, N.J., assignor to Monroe Calculating Machine Company, Orange, N.J., a corporation of Delaware Filed'Nov. 7, 1958, Ser. No. 772,499

7 Claims. (61. 235-63) This invention relates to value entering means for tenkey type calculating machines wherein selective successive depression of the 0 to 9 digital value keys is operable to enter corresponding values respectively into successive ordinal units of a storage device.

The most commonly known type of storage device for ten-key machines comprises a selector carriage having ordinal rows of settable stop pins. Upon successive depression of the digital value keys, pins corresponding to the values of the depressed keys are set in the rows respectively from higher to lower orders. Subsequently the set pins are effective to control excursions of actuator racks in a registering operation.

Another known type of storage device for ten-key machines includes an ordinal series of storage gears mounted in a selector carriage. The gears are successively set, from a home or zero position, to positions corresponding respectively to the values of the successively depressed digital value keys. Subsequently the gears are engaged by actuator racks and then zeroized to control excursions of the racks in a registering operation. Also the gears may be utilized as a multiplier storage medium. in this instance, the set gears are successively counted back to zero, as is well known in the art, thereby determining the number of times a multiplicand will be added in the accumulator of the machine.

The value entering means of the present invention includes an ordinal series of storage gears mounted in a selector carriage, as defined above, with novel power operated means to set said gears.

It is accordingly a principal object of the invention to provide selection means for a ten-key type machine which is both rapid and positive in operation.

Another object of the invention is to reduce the key pressure necessary in the operation of the selection means.

Another object of the invention is toprovide means operable upon partial key depression to complete an operation partially completed by the partial key depression.

A further object of the invention is to achieve improved operating characteristics of the selection means with relatively simple mechanism having a minimum number of parts.

Other objects and advantages of the invention will be evident from the following description with reference to the accompanying drawings in which:

FIG. 1 is a plan view of the storage units and the means for entering selected values therein.

FIG. 2 is a vertical section taken on the line 22 of FIG. 1.

FIG. 3 is a fragmentary perspective of the actuator gear drive and associated selection mechanism.

FIG. 4 is a fragmentary perspective of the escapement mechanism for the selector carriage.

FIG. 5 is a fragmentary side elevation of the single cycle clutch for operating the actuator gear drive and the escapement, and control means for the clutch.

FIG. 6 is a sectional view of the clutch taken on line 6-6 of FIG. 5.

Successive digits of a multidigit value are entered into the machine, highest order first, through a ten-key keyboard 1 (FIGS. 1, 2, 5). The keyboard includes ten keys numbered 10 through 19, shown in dot-dash lines (FIG. 1), for the digits 0 through 9 respectively.

The stems 2 of the keys are guided for vertical movement in pairs of aligned slots in upper and lower keyboard plates 3 and 4 and are provided with rack teeth at their forward edges. Four coil springs 5 (FIG. 2) are threaded through intermediate framing plates of the keyboard and are secured (not shown) at their opposite ends to the left and right end plates 7 and 8 (FIG. 1). The springs 5 engage the lower ends of the key stems and normally resiliently bias the keys to raised position. One such spring is provided for the transversely elongated zero key 10 and one for each of the horizontal rows of keys 11-13, 14-16, and 17-19.

Disposed in spaced side-by-side relation beneath the digit keys 10 through 19 are a like number of identical selector rack slides 20 through 29 respectively associated therewith. The slides are supported for longitudinal movement on a pair of spaced rods 33 (FIGS. 2, 3) which extend laterally through elongated slots 34 thereof and are provided with rack teeth along their lower edges.

The rack teeth of each key stem 2 is meshed with a pinion 36. The nine pinions 36 of the digit keys 11 through 19 are mounted, in horizontal rows of three each, for independent rotation on respective shafts 40 and pinion 36 for zero key 10 is mounted for rotation on an individual shaft 40. Each pinion 36 is of suflicient width to extend laterally into the plane of the associated selector slide where said pinion is engaged with the rack teeth along the underedge of said slide. It will be noted that pinions 36 of the middle row of keys 14, 15, and 16 (FIG. 1) which engage the rack teeth of slides 24, 25, and 26 cross laterally under slides 27, 28, and 23' respectively. Accordingly these pinions 36 are provided with circumferential grooves to permit free longitudinal movement of these intervening slides 27, 28, and 23.

Elongated zero key 10 is provided at its left end portion with a second stem 52 (FIG. 1) and meshing pinion 53. The latter is rigidly secured to the active pinion 36 by a sleeve and the zero key is thereby accurately guided for vertical movement and any skewing tendency is avoided.

It will thus be seen from the foregoing that each digit key is in driving relation with its related selector slide and will, upon being depressed, be effective to drive the slide rearwardly from the normally disabled position of FIGS. 1 and 2 to the enabled position shown in FIG. 3. As will be described subsequently, the selector slide corresponding to any given value will be efiective when in enabled position to control the extent of rotation of a selector shaft 55 and thereby determine the value of the digit to be entered into storage gears of a selector carriage.

Selector shaft 55 extends transversely at the rear of selector slides 2ti29 and is rotatably mounted in the machine framing. Fixed on shaft 55 in longitudinal alignment with each selector slide is a collar 56 having a radially extending stop lug 56a as best seen in FIGS. 1 and 3. Collars 56 are arranged on shaft 55 so that lugs 56a are spaced angularly from one another at distances relatively corresponding to the digits respectively represented by the associated selector slides.

Upon rearward movement of a selector slide 20-29, its rear end will be brought from the ineffective position of FIGS. 1 and 2 to a position immediately adjacent the associated collar 36, as shown in FIG. 3, where it is in the rotational path of clockwise movement of stop lug 56a on the collar. If shaft 55 is then rotated clockwise, lug 56a will be brought into engagement with the end of the selector slide thereby arresting rotation of said shaft after rotation from a normal position through an angular distance corresponding to the digital value of said slide. For

ace gee? example, if zero slide 2% is moved toward the rear, its rear end will be in position for immediate engagement by lug 56a. of the associated collar 56 upon rotation of shaft 55. Therefore, substantially no rotational movement will be afforded shaft 55. iowever, if a slide 21-2? is adjusted rearwardly the lug 56a of the associated collar 56 will engage the adjusted slide after rotation of shaft 55 through an angular distance corresponding to the digital value of said slide.

A selector carriage designated generally by the numeral 57 (FIGS. 1, 2) is normally located to the right of the keyboard. The selector carriage comprises a pair of end plates 58 which are slidably mounted on a pair of transversely extending shafts 59 and 69 supported in the machine framing.

Rotatably mounted on a shaft 61 in carriage 57 is an ordinal series of storage gears 62, and fixed for rotation with each gear 62 is a numeral wheel 63 to indicate the value set in the gear. Suitable detent means is adapted to hold each storage gear and wheel yieldably in set position. Such detent means comprises a pair of sprin urged balls 42 which engage an inner annulus of notches 43 in the wheel. Engaging storage gears 62 are intermediate gears 64 rotatably mounted in carriage 57 on a shaft When carriage 57 is in normal rightmost position, the leftmost intermediate gear 64 is in the plane of a mutilated actuator gear 66, as shown in FIG. 1, which is fixed on selector shaft 55. Normally, however, the gears are not engaged (PEG. 2) because of the mutilation of gear 66. As carriage 57 is ordinally shifted toward the left, as later described, the successive lower order intermediate gears 6 are brought successively into the plane of mutilated actuator gear as.

Means for controlling left shift of carriage 57 includes an escapement rack 67 (FIGS. 1, 2, 4). Rack 67 is mounted for transverse movement in the machine framing and is biased leftwardly by a spring 63. The left end plate '8 of carriage 57 is provided with a rearwardly extending lug which extends through a slot in rack 67. Therefore transverse movement of rack or is imparted to carriage 57.

A gear 69 engages teeth at the underside of rack 67 and is mounted on a shaft it? which is supported in the machine framing. Fixed for rotation with gear 69 is a ratchet wheel 71. Ratchet wheel 71 is adapted for engagement with a pair of vertically disposed escapement fingers 72 and 73. Fin ers 72, 73 are pivotally mounted at their lower ends on oppositely disposed arms of a rocker 74 which is controlled as later described, and are guided for vertical movement by suitable slots in a plate 49.

When rocker 74 is in normal counterclockwise position (FIGS. 2, 4), finger 72 will be raised into the path of movement of the teeth of ratchet wheel '71 and finger 73 will be lowered out of the path of movement. Finger 72, therefore, will restrain ratchet wheel 71 and gear 69 from counterclockwise movement thereby restraining rack 67 and carriage 57 against the urge of spring 68 from movement toward the left.

Upon clockwise movement of rocker 74, finger 72 will be lowered to release ratchet wheel 71 and finger 73 will be raised into the path of movement of the teeth thereof. This will release carriage 57 for one-half step of ordinal movement toward the left. This one-half step of movement will bring an intermediate gear 64 from the plane of actuator gear 66 and bring the neXt adjacent lower order gear 64 one-half step of movement toward the plane of actuator gear 66. When rocker 74 is restored counterclockwise, finger 735 will release carriage 57 to complete its ordinal step of movement thereby bringing said next lower order intermediate gear 64 into the plane of actuator gear 66. It will thus be seen that the intermediate gears 64 will be brought successively from higher to lower orders into the plane of mutilated actuator gear 66.

A single cycle clutch (F163. 1, 5, 6), designated generally by the numeral 75 and which is controlled as described later, is adapted to drive selector shaft 55 and escapement fingers "1'2, 73 in timed relation. Clutch 75 is of well-known construction wherein a toothed wheel 76 loosely mounted on a shaft 91 comprises the driving member of the clutch and is driven by a motor (not shown) through a suitable gear train including a gear '77. The driven member of the clutch Comprises a housing 78 which is keyed on shaft 911 which carries a spring urged pawl '79. Normally, pawl 79 is restrained from engagement with drive wheel 76 by engagement with a detent St? which is mounted on a fixed pivot 81. Detent Stl has operating connection at the rear of a forwardly extending link 83. Link 32 is normally held toward the rear by a spring 5& and is moved forwardly upon depression of any one of the digit keys lid-l9, as later described, to control detent When link 82 is in normal rearward position, detent So will be rocked clockwise into the path of movement of pawl '79 thereby holding it from engagement with wheel 76 and disengaging the clutch.

A single cycle lever 83 has common pivotal mounting at 81 with detent Lever 83 is biased clockwise by spring connection 84 with an arm Za of link 82.. However, when link 82 is in normal rear position the front end of a slot in arm 82;! will engage a pin in the lower arm of lever 83 thereby holding said lever in counterclockwise position as shown in PEG. 5 with the upper end of said lever out of the path of movement of pawl 79.

Upon forward movement of link 32, detent 8t) will be moved counterclockwise from engagement with pawl 79 to engage the clutch. During this operation, spring 84- will be effective to rock single cycle lever 83 clockwise. However, before appreciable clockwise movement of lever 83, an inclined edge '78:: of clutch housing 78 will engage the upper end of said lever thereby restraining it from such clockwise movement. As clutch housing 78 rotates counterclockwise in the cycle of operation of the clutch, the upper end of lever 33 will ride on the outer peripheral edge of said housing.

Near the end of the cycle of operation of clutch 75, a cutout portion 78b of clutch housing '78 will engage lever 83 which will therefore be released and moved clockwise by spring Thus lever will be moved into position to engage pawl 79 and disengage the clutch at the end of the single cycle of operation.

Upon release of the depressed digit key, link 82 will be restored rearwardly by spring 5% and detent 8% will be moved clockwise to hold pawl 9 in clutch disengaging position while single cycle lever 83 will be restored counterclockwise from engagement with said pawl. If the depressed digit key is released before clutch 75 has completed its cycle, detent St? will ride on the periphery of clutch housing 78 thereby preventing return movement of link 82 until cutout portion 78b permits said detent to be restored clockwise to disengage the clutch at the end of the cycle. As later described, link 32 when held in forward position, is effective to lock down a depressed 19-19 digit key thereby holding the parts operated by said key in adjusted position until completion of the operations performed by the clutch.

The driving means for selector shaft 55 comprises an eccentric 73c integral with clutch housing '73. Eccentric 78c operates an upwardly extending strap 36. Strap 86 has pivotal connection at its upper end with a rightwardly extending arm of a lever o7. A segmental rack 88 has common pivotal mounting with lever 87. A spring 89 extends between a leftwardly extending arm of lever 87 and rack thereby normally holding said rack counterclockwise and into engagement with a limit pin 87a in said lever. Rack engages a pinion 9t fixed at the right end of selector shaft 55.

Normally eccentric 78c holds strap in lowermost position. Therefore, lever 87 and rack 33 will be held in clockwise position as shown in MG. 5. During the first 180 of operation of clutch 75, eccentric 780 will be effective to raise strap 86 thereby rocking lever 87 and rack 88 counterclockwise. Counterclockwise rotation of rack 68 will rotate pinion 9'9 clockwise and likewise rotate selector shaft 55. During this rotation of shaft 55, a stop lug 5601 will be rotated into engagement with a set selector slide 26-29 as later described. Shaft 55, pinion 90 and segment 88 therefore will be arrested from further rotation.

The upward movement of strap 86 by eccentric 780 will be operable to rock lever 87 a distance greater than that required to impart maximum rotation to selector shaft 55, i.e., the distance required to engage the associated lug 56a with digit 9 slide 29. It has been found that between 150 and 170 of a cycle of clutch 75 may be utilized to impart this maximum rotation to the selector shaft. Consequently, upon engagement of a stop lug 56a with a selector slide, the resilient connection comprising spring 89 will yield as rack segment 88 18 arrested from further rotation. Lever 87 therefore will be rocked idly further counterclockwise as the clutch completes its first half cycle of operation. During this first half cycle of operation of clutch 75, rotation of se lector shaft 55 will be operable to set a value corresponding to the value of a depressed digit key into one of the storage gears 62 as later described. During the last half cycle of clutch 75 eccentric 780 will be operable to restore the parts thereby rotating selector shaft 55 counterclockwise to normal position.

A cam 93 (FIGS. 2, 4) is effective to operate the escapement comprising fingers 72, 73. Cam 93 is fast on shaft 91 which is driven by clutch housing 78. The lower part of cam 93 normally engages rocker 74 which is urged counterclockwise by a spring 95. Counterclockwise rotation of cam 93 will first be effective to em gage its high portion with rocker 74 thereby rocking said rocker clockwise to lower finger 72 and raise finger 73. This will permit one-half ordinal step of movement of carriage 57 to the left as heretofore described. Upon completion of the cycle of operation of clutch 75, the low portion of cam 93 will again engage rocker 74 thereby permitting the parts to be restored and permitting carriage 57 to complete its ordinal step of movement. Timing of the operation of the escapement with respect to the operation of selector shaft 55 will be described later.

As described before, depression of a digit key -19 will be effective to move the associated slide -29 toward the rear and into the path of movement of stop lug 56a of the associated collar 56. In FIG. 3 of the drawing, digit key 16 (digit 6) is shown depressed thereby moving selector slide 26 toward the rear. Movement of any one of the selector slides is adapted to engage clutch 75. Furthermore, means is operable during operation of clutch 75 to latch the operated selector slide in rearward effective position.

To effect engagement of clutch 75, a bail 96 (FIGS. 1, 3) is common to all of the selector slides. Bail 96 extends transversely above selector slides 20-29 and is engaged by a rearwardly facing shoulder of each slide. Bail 96 is fixed on a rock shaft 97 which extends transversely below the selector slides. Shaft 97 extends toward the right from bail 96 and adjacent its right end has fixed thereon a depending crank arm 98 (FIGS. 1, 5) which has pivotal connection at the front end of link 82. Upon movement of any one of the selector slides 20-29 toward the rear, its shoulder will be effective to rock bail 96, shaft 97 and crank 98 clockwise. Clockwise movement of crank 98 will move arm 82 forwardly thereby engaging clutch 75 as heretofore described. A switch (not shown) for the motor which drives clutch 75 may be closed upon clockwise movement of crank 98 or the motor may be continuously operable.

Means is provided to hold arm 82 toward the front of the machine during operation of clutch 75 thereby holding bail 96 in rocked clockwise position. To effect this holding operation, the inclined edge 78a (FIG. 5) of clutch housing 78 will engage detent 80 thereby rocking it slightly further counterclockwise for engagement with the outer edge of said housing. Arm 82 therefore will be held forwardly until near the completion of the clutch cycle when the recessed portion 78b of the housing will engage detent 80.

The means to latch each slide 20-29 in rearwardly adjusted position during the cycle of clutch 75 comprises a latch lever 99 (FIGS. 2, 3) intermediately pivoted on the right side wall of each of said slides. Adjacent the front of each latch lever 99 is a cam slot 9911 Which is engaged by the front supporting shaft 33.

When a selector slide is in normal forward position (FIG. 2), shaft 33 will engage the rearward end of cam slot 99a of its latch 99. This will hold the latch in clockwise position to disengage a latch shoulder at its rear end from bail 96. However, upon rearward movement of a selector slide 26-29 and attendant clockwise movement of bail 96, the front end of cam slot 99a will be moved into engagement with shaft 33. This will be effective to rock latch 99 counterclockwise from the ineffective position of FIG. 2 to the effective position of FIG. 3 wherein its shoulder is raised to engage bail 96. Thus it will be seen that the selector slide will be latched in rearward effective position as long as bail 96 is held in clockwise position.

Through inadvertence, an operator may depress a key 10-19 to an incompletely operated position wherein detent 80 will be rocked counterclockwise from engagement with pawl 79 to engage clutch 75, but wherein the associated slide 20-29 will not be moved to its rearmost position into the path of movement of a lug 56a. In such an instance, inclined edge 78a of clutch housing 78 will engage and rock detent 80 further counterclockwise until it is engaged by the peripheral edge of the housing as previously described. This will move link 82 further forward thereby further rocking shaft 97 and bail 96. Latch 99 of the operated slide 20-29 will, at this time, be engaged with ball 96. Therefore the associated slide 20-29 will be moved to its rearmost position and the key 10-19 entrained therewith will be moved to fully depressed position.

From an inspection of FIG. 2 it will be seen that mutilated actuator gear 66 is several degrees counterclockwise from engagement with the intermediate gear 64 with which it is aligned. It will be noted that mutilated gear 66 comprises nine teeth; therefore, the gear will be effective to rotate intermediate gear 64 and the associated storage gear 62 from one to nine steps of movement corresponding respectively to the digits 1-9.

During approximately the first to 170 of operation of clutch 75, the heretofore described drive means for shaft 55 will be operable to rotate actuator gear 66 clockwise until arrested by engagement of a stop lug 56a with a selector slide. A value corresponding to a depressed digit key lif -l9 therefore will be entered into storage gear 62. During the remainder of the half cycle of operation of clutch 75, selector shaft 55 and actuator gear 66 will be held in arrested position and cam 93 (FIGS. 2, 4) will be effective to operate the escapement comprising fingers '72, 73 to permit one-half step of movement of carriage 57 toward the left. This half step of movement will disengage intermediate gear 64 from engagement with actuator gear 66 and position the next lower intermediate gear 64 one-half step of movement from the plane of actuator gear 66. Actuator gear 66 therefore will lie between an adjacent pair of intermediate gears and may be restored counterclockwise to normal without interference.

During approximately of the last half cycle of operation of clutch 75, shaft 55 and actuator gear 66 will be fully restored counterclockwise. This will bring the mutilated portion of the actuator gear into transverse alignment with intermediate gears 64. Therefore, carriage 57 may be afforded the second step of movement to complete the ordinal shift of operation to bring the next lower order intermediate gear into the plane of actuator gear 66. Consequently, as clutch 75 completes its cycle of operation, the escapement will be operated to permit carriage 57 to complete its ordinal step of movement.

Upon completion of the operation of clutch 75, bail 96 and an operated selector slide Zti-29 will be restored if a depressed digit key Iii-19 has been released prior to completion of the clutch cycle. Alternatively, upon release of the depressed ke, the parts will be restored. Thus it will be seen that in response to successive depression of digit keys M3 19, values corresponding to the depressed keys will be set in the successive order storage gears 62 from higher to lower orders.

As heretofore described, the storage gears 62 may be zeroized thereby controlling the excursions of actuator racks (not shown) to enter corresponding values into an accumulator of the machine. Such operation is fully disclosed in US. Patent No. 1,832,791 and in Swedish Patent No. 61,735 issued to K. V. Rudin. At the conclusion of the registering operation during which storage gears 62 are zeroized, carriage 57 may be restored as disclosed in the above said patents or in any manner well known in connection with pin carriage return means in the ten key listing machine art. As carriage 57 is restored, ratchet wheel '71 (FIGS. 2, 4) will be rotated clockwise and its teeth will rack idly over yieldable escapement fingers 72, 73.

it may occur to one skilled in the art that storage gears 62 could be non-shiftable in the machine framing and actuator gear 66 could be shiftable with respect thereto on drive shaft 55 without departing from the principles of operation of the invention. in such instance, actuator gear 66 would be splined for shifting movement on shaft 55. Actuator gear 66 would be shifted to the rig t for engagement with the successive lower order intermediate gears 64. The timing of the shifting operations with respect to rotation of actuator gear 66 would be identical to the timing described in connection with shifting of selector carriage '7 with respect to said actuator gear.

Although the storage devices of the present invention have been described as operable to control a registering operation, it will be obvious that storage gears 62 and associated numeral wheels 63 may be utilized as registering devices per se. it will be understood therefore that the invention resides in the means whereby values are entered into the storage devices in response to suecessive depression of the digital value keys and not in the utility of said storage devices. The invention therefore is to be limited only as necessitated by the spirit and scope of the appended claims.

I claim:

1. In a calculating machine; a shiftable carriage, an ordinal series of digital Value storage gears in said carriage, a rotatably mounted shaft, an actuator gear on said shaft, shift means for ordinally shifting said carriage to bring said storage gears successively into position to be driven by said actuator gear, a plurality of stop lugs differentially positioned in angular relationship along said shaft, a plurality of slides each having a stop end, said slides being settable to bring their stop ends respectively into the path of rotation of said stop lugs, a ten: key keyboard, and means operable in response to depression of each of said keys to set a respective one of said slides, to effect rotation of said shaft and to effect one ordinal shift operation of said shift means.

2. In a calculating machine; a shiftable carriage, an ordinal series of digital value storage gears in said carriage, a rotatably mounted shaft, an actuator gear on said shaft, a plurality of stop lugs differentially positioned in angular relationship along said shaft, means for yieldably driving said shaft in one direction and positively in the opposite direction, shift means for ordinally ages? shifting said carriage to bring said storage gears successively into position to be driven by said actuator gear, a plurality of stops respectively settable into the path of rotation of said step lugs, a ten-key keyboard, and means sequentially operable in response to depression of each of said keys to set a respective one of said stops, to effect operation of said drive means in said one direction, to effect a first half step ordinal shift operation of said shift means, to effect operation of said drive means in said opposite direction and to effect a second half step ordinal shift operation of said shift means.

3. In a calculating machine; a shiftable carriage, an ordinal series of digital value storage gears in said carriage, a rotatably mounted shaft, an actuator gear on said shaft, means for ordinally shifting said carriage to bri g said storage gears successively into position to be "rear by said actuator gear, means for rotating said shaft when each of said storage gears is in position to be driven by said actuator gear, a plurality of stop lugs differentially positioned in angular relationship along said shaft, a plurality of rack slides each settable to position a stop end thereof into the path of rotation of a respective one of said stop lugs, and means for setting each of said rack slides comprising a pinion engaging said rack slide and a key having a stem with teeth engaging said pinion.

4. The invention according to claim 3; including a bail rocked upon setting of any one of said rack slides, and control means operable in response to rocking of said bail to control said means for rotating said shaft and said means for shifting said carriage.

5. The invention according to claim 4; said control means including a clutch engaged upon rocking of said bail.

6. In a calculating machine; a shiftable carriage, an ordinal series of digital value storage gears in said carriage, a rotatably mounted shaft, an actuator gear on said shaft, a plurality of stop lugs differentially positioned in angular relationship along said shaft, a yieldable drive train for said shaft, shift means for ordinally shifting said carriage to bring said storage gears successively into position to be driven by said actuator gear, a plurality of stops respectively settable into the path of rotation of said stop lugs, a cyclically operable clutch, means operable by said clutch to operate said drive train for said shaft and to effect one ordinal shift operation of said shift means, a ten-key keyboard, means operable by depression of each of said keys to move a respective one of said stops toward set position, a transmission train operable by depression of any one of said keys to engage said clutch during movement of the associated stop toward set position, and means operable by said clutch including said transmission train for completing the movement of said associated stop to set position.

7. In a calculating machine; a shiftable carriage, an ordinal series of digital value storage gears in said carriage, a rotatably mounted shaft, an actuator gear on said shaft, a plurality of stop lugs difierentially positioned in angular relationship along said shaft, a yieldable drive train for said shaft, shift means for ordinally shifting said carriage to bring said storage gears successively into position to be driven by said actuator gear, a pluraiity of stops respectively settable into the path of rotation of said step lugs, a cyclically operable clutch, means operable by said clutch to operate said drive train for said shaft and to effect one ordinal shift operation of said shift means, a ten-key keyboard, means operable by depression of each of said keys to set a respective one of said stops, a transmission train operable upon partial depression of any one of said keys to engage said clutch, and means operable by said clutch including said transmission train for further depressing a partial depressed one of said keys.

(References on following page) References Cited in the file of this patent UNITED STATES PATENTS Shiek Apr. 10, 1906 10 Mays Mar. 18, 1919 Hamann Mar. 3, 1925 Fuller Nov. 5, 1935 Hopkins et a1 June 22, 1954 Stansell Dec. 15, 1959 Heinze et a1. July 19, 1960

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