US2733007A

US2733007A - Power operated selection mechanism

Info

Publication number: US2733007A
Authority: US
Publication date: 1956-01-31
Anticipated expiration: 1973-01-31

Description

1956 D. L. ROLPH 2,733,007

POWER OPERATED SELECTION MECHANISM Filed Nov. 17, 1952 2 Sheets-Sheet l N :0 r I F) mmm: I 2

DONALD L. ROLPH A ORNEY Jan. 31, 1956 D. L. ROLPH POWER OPERATED SELECTION MECHANISM 2 Sheets-Sheet 2 Filed Nov. 17, 1952 m #V I HHIMH mi 31 mu muHll -u m1 C N2 :1 Q I 5 m2 34% ow mm mm Nb m-HlMIH NN VENTO A OR DONALD L.ROLPH m m- H II H 2,733,007 POWER OPERATED SELECTION MECHANISM Donald L. Rolph, Hayward, Calif., assignor to Friden Calculating Machine (30., -Inc., a corporation of California This invention relates to calculating machines, and par- United States Patent ticularly to a mechanism for progressively changing the selection mechanism with successive cycles of machine operation, as is necessary in the extraction of square root described in the copending applications of Grant C. Ellerbeck, S. N. 244,518, filed; August 31, 1951, and S. N. 279,832, filed April 1, 1952. H

A particular object of the present invention is to provide a mechanism for progressively changing the value in the selection mechanism of a calculating machine during a multicycle operation, and particularly a selection mechanism of the type described in the patent to Phinney, No. 1,399,652, issued December 6, 1921.

A further object is toprovide a step feed for the selection mechanism of said patent.

Another important object of the present invention is to provide a mechanism for storing a factor for use in inserting a keyboard value into the machine when desired by the operator and particularly adapted to a selection mechanism of the type described in said Phinney patent.

A further object of the presentinvention is to provide an improved factor storage mechanism particularly adapted for use in storing any factor that would be inserted in the keyboard of a machine of the type described in said Phinney patent.

Another object of the present invention is to provide a mechanism adapted to set the selection mechanism of said Phinney patent by increments of any selected progression, as by increments of 1, in a particular order and to simultaneously setv a predetermined value, such as 5, in the next lower order thereof.

Another object of the present invention is to provide a selection mechanism of the type described, by means of which mechanism a selected progression of numbers, such as successive odd numbers in the extraction of square root, can be inserted into the selection mechanism of the calculating machine. v

These, and other, objects of the present invention will be apparent from the description and claims which follow.

The invention will be more readily understood by a consideration of the drawings which form a part hereof and in which:

Fig. 1 is a side view of one order of the selection mechanism of said Phinney patent, with one embodiment of my step, or cyclic, feed mechanism applied thereto.

Fig. 2 is an enlarged rear view of the mechanism of my invention shown in Fig. 1, such as taken along the oblique plane indicated by the line 2-2 of Fig. 1.

Fig; 3 is an enlarged development of the operating cam shown in Figs. 1 and 2.

Fig. 4 is a front view of the machanism of another embodiment of my invention, also adapted for use with the selection mechanism of said Phinney patent and particularly designed for .the extraction of square root by the method'in which a value of 5 is automatically inserted in a selected order, and progressive increments of 1 are set into the next higher order.

Fig. 5 is a cross-sectional view of the machanism shown in Fig. 4, such as taken along the longitudinal vertical planes indicated by the line 5-5 of Fig. 4.

Figs. 6 to 9, inclusive, show in detail the feed ratchet, the two valuedetermining cams, and the clear gear, all of which are mounted on a common shaft, and relate to the mechanisms shown in Figs. 4. and 5-Figs. 7 and 8 being in enlarged scale} The selection mechanism of the said Phinney patent provides ordinally arranged rows of value keys 20 (see Fig. 1). each of which is mounted upon a key stem 21 cut from a common pattern. The key stems 21 are slidably mounted in the machine for vertical movement, being urged to their raised position by suitable springs 22 and adapted to be latched in a depressed position by a common bail, or latch, 23 engaging notches (not shown) in the sides of the key stems 21. Integral with the lower end of the key stems. 21 is a downwardly projecting head 24 provided with a pair of internally opening

cam faces

25 and 26, as shown particularly in Fig. 4.

Associated with each order of keys 20 is a pair of

gate members

30 and 31 adapted to be operated by the cam faces 25 and 26, respectively. The gate members are mounted longitudinally in the machine for rocking movement by any suitable means such as aligned perforated cars 35 at each end of'the gates, engaging over aligned studs 36 (as shown in Fig. 5) mounted in the machine. The forward end of the left-hand gates 30 of each order is cut away (as shown in Fig. 1), to prevent engagement with the l to 4 value keys and is provided with five cam cars 32 (see Fig. 4), associated with the

value keys

5, 6, 7, 8, and 9. These ears 32 are of identical configuration and angular placement with respect to the associated gate 30. Thus, the depression of any of the value keys 5 to 9," inclusive, by means of the engagement of cam face 25 with an ear 32, rocks the gate 30 (clockwise in Fig. 4) a single increment of motion. The right-hand gate 31 of each order is provided with nine cars 33 which are of similar size but are angularly displaced diiferential amounts: The 1 and 6 keys being adapted to give the bail, or gate, 31 a single increment of angular displacement (counterclockwise in Fig. 4); the 2 and 7 keys being adapted to give two increments of motion, the 3 and 8 adapted to give three increments of motion, the .4 and 9 four increments of motion, and the ,ear'associated with the 5 key being so set as to avoid rocking of the gate'31. Thus, the depression of the 1 to 4 value keys will rock the gate 31 by corresponding angularincrements of .motion; the depression of the 5" key will rock the gate'30 a single increment of motion but will not rockthe gate 31; while the depression of the 6 to 9" keys will rock the gate 30 a single increment of motionand will rock the gate 31 by one to four increments of motion, respectively. Each of the

gates

30 and 31 is provided with a bifurcated rear end 37 (see Fig. 1) which engages feed gears 38. The feed gear associated with the left-hand gate 30 has five teeth of identical tooth width, while the gear 38 associated with the gate 31 has four teeth of progressively increasing lateral width so that the differential displacement of the gear33 by the rocking of the gate 31 will project one to four teeth into the plane of an intermediate gear 39. Thus, the rocking of the gates differential amounts by the depression of the keys 20 will be operative to place a corresponding number of teeth into the plane of the intermediate gear 39, whereby the rotation of the drive shaft 41 will be operative to transfer the selected values through the intermediate gear 39 into the register dials 40.

A more complete description of the selection mechanism .will be found in the Phinney patent referred to. In view of the fact that this mechanism is conventional in one of the well-known calculating machines now on the market, it will not be further described. It can be noted that my invention, while dealing with this conventional selection mechanism, makes no claim as to any invention in the selection mechanism per so. My invention relates to a mechanism for progressively inserting values into the selection mechanism, in multicycle operation of the machine, as is necessary in the extraction of square root described in the applications above-mentioned. In its preferred form the mechanism of my invention is also adapted to store a value so set into the machine in order that it may he held an indefinite time without effecting manual operation of the keys 20 and the selection mechanism controlled thereby. The preferred form of my invention, which is shown in Figs. 1 to 3, inclusive, will now be described.

The lower edge of each of the

bails

30 and 31 is provided with downwardly extending

noses

50 and 51, respectively. These noses are adapted to engage an arcuate cam member 52. which lies between the two noses 5i? and 51, as shown in Figs. 2 and 3. The arcuatecam 52 is mounted on a rocker arm 53, the rocker arms 53 being pivotally mounted on a suitable transverse shaft 54, as shown in Fig. 1. Each of the rocker arms 53 is provided with a tail 55 to which is attached a suitable tension spring 55, the other end of which is aflixed to any suitable means in the machine, thereby tending to rock the rocker 53 and integral cam 52 (clockwise in Fig. l) to its inoperative, or zero, position shown in Figs. 1 and 3.

Associated with the ordinally arranged rocker arms 53 is a holding bail 57 mounted on a transverse shaft 58, the bail being adapted to be rocked upwardly (counter-clockwise in Fir. l) by any suitable means not here pertinent, to engage the tail 55 of the rocker arm 53, and thereby lock the arm against rotation.

The shape of the arcuate cam 52 is shown in the development of Fig. 3. It includes a peripheral edge 60 adapted to engage the nose 50 of gate 30. This edge 60 is straight for four increments of motion from the position shown (from left to right in Fig. 3), and then it is stepped outwardly a single increment of motion corresponding to the rocking of the gate 30 when the 5 to 9 keys are depressed. The arcuate cam 52 is also provided with a stepped face 61 adapted to cooperate with the gate 31. This peripheral edge 61 is provided with ten stepped surfaces corresponding to the values 0 to 4,

inclusive, repeated once. These steps of the edge 6i are so arranged as to rock the gate 31: angular amounts corresponding to the rocking of the 1 'to 9 keys, respectively, and a zero position such as shown in Fig. 3.

It is believed obvious that the rocking of the rocker 53 differential amounts will be operative through the means of cam 52 to rock the

hails

30 and 31 to corresponding value positions," and will therefore be operative to insert like values into the selection gears 38 and thence into register 40. A preferred means for thus ditierentially rocking the rocker 53 will nowbe' described. A ratchet plate it; is pivotally mounted on the transverse shaft 54 immediately adjacent'each of the rocker arms 53. The ratchet plate 70 is provided with ratchet teeth 71 adapted to be engaged by a feed pawl 80 and a holding. pawl 95. It can be noted at this point that the teeth 71 of theraclr must be wide enough to permit both the feed pawl 8t) and the holding pawl 95 to engage the same tooth. The ratchet plate 79 is also provided with an arcuate slot 72 which embraces a pin 73 carried by the rocker arm 53. The

ratchet plate also has an integral arm, or projection,

74 upon which is rigidly secured a spring stud, 'or seat, 75

adapted to seat one end of a tension spring 76 tensioned between the stud 75 and the pin 73 previously mentioned. By this means the rocking of the ratchet plate 76 is operable by means of spring 76 to bias the rocker arm 53 and integral cam 52 to a differential position corresponding to the position of the ratchet plate70.

The ratchet plate 70 can be fed to any difierential position by means of the feed pawl 80. Preferably the feed pawl 89 is pivotally mounted on a feedfarm 81 by'any suitable means, such as stud 82. The feed arm 81 is rigidly mounted on a transverse power shaft 83 which, through any suitable mechanism not here pertinent, is given an oscillatory motion with each cycle of machine operation. The feed pawl is resiliently urged into engagement with the ratchet plate 70 by a spring 84 tensioned between studs on the feed pawl Si) and feed arm 81. The rear end of the feed pawl 86 is provided with a nose 85 adapted to engage the periphery of a cam 86 rigidly secured to a cam shaft 87. The shaft 87 extends across the keyboard and is provided with a cam for each order of the selection mechanism. In the preferred form of my invention the cams 86 are provided with depressions 88 staggered around the shaft 87, whereby only one feed pawl 80 will have its tail S5 seated in the depression 88 of the corresponding camthe various orders being selectively operative by rotation of the shaft 87 and fixed cams 86. When the feed pawl 80 is engaging the periphery of the cam outside of the notch, or depression, 38, the feed pawl is rocked (clockwise from the Fig. 1 position) to a position in which its nose is unable to engage the ratchet notches, or teeth, 71 of the ratchet plate 70. On the other hand, when the tail 85 is seated in a depression 58 the spring 84 rocks the nose of the feed pawl 80 into engagement with the periphery of the ratchet plate 70. whereby the oscillation of the feed shaft 83 will be operative to rock the ratchet plate 70 an increment of motion, where it will then be held by the holding pawl if the latter is in its operative position. It will be understood that the cam shaft will have a 0 position in which all feed pawls are inoperative and that the feed pawl may be operated to feed the ratchet either one or two, or even more, spaces in order to provide for a predetermined progression of numbers (e. g. the feed of l in the first cycle and 2 in each cycle thereafter'to provide for the extraction of square root in S. N. 244,518, above mentioned).

Associated with each feed pawl 80 is a holding pawl 95, the holding pawls 95 being ordinally arranged and pivotally mounted on a transverse shaft 96. The holding pawl 95 is in a plane immediately adjacent the feed pawl 89, whereby both pawls may engage the same tooth71 of the ratchet plate 70. Associated with the holding pawl 95 is a clearing bail v97 mounted on a transverse shaft 98. When the'bail is rocked to its clockwise position (shown in Fig. 1) the bail engages the free end of the holding pawl, thereby rocking the pawl out of engagement with the periphery of ratchet plate 70. However, when the bail 97 is rocked counter-clockwise from the position shown in Fig. 1, then the holding pawl 95 is urged into peripheral engagement with the ratchet plate 70 by means of a spring 99.

It is believed that the operation of this preferred cmhodirnent will have been understood by the above dcscription. However, it can be briefly summarized by pointing out that the rocking of the feed shaft 33- by a suitable mechanism not here pertinent, such as a square root feed mechanism, will rock all of the feed arms 81 and feed pawls Si). in the order, or orders, in which the feed pawls are operative, by the seating of the tail 35 in the depression 88 of the cam 86, the feed pawl in its oscillation, engages the teeth 71 of the ratchet plate 76, urging the plate forwardly a selected increment of motion (counter-clockwise in Fig. l). The ratchet is then held in the adjusted position by the holding pawl 95, if the, latter is permitted to act by the bail 97. Thus, the ratchet plate 70 is differentially positioned step-by-step with each cycle of machine operation and is held in the adjusted position, if desired. The positioning of the ratchet plate 70 is operable, through the spring 76, to similarly position the rocker arm 53 and integral cam 52 in' a similar differential position. The positioning of the cam 52 is operable by means of its stepped faces 60 ate-sow 5 values. A value so set in the cam 52 can be cleared by rocking the bail 97 (clockwise in Fig. 1) to rock the holding pawl 95 (counter-clockwise in Fig. 1) to its disengaging position and simultaneously rocking the shaft 87 to its position, in which event none of the feed pawls 80 will engage the depressions 88 of the cam 86. When so released by the feed and holding pawls, the spring 56 rocks the rocker arm 53 to the 0, or inoperative, position.

If it is desired to store a value so fed into the ratchet plates 70, in a manner in which it can be used in subsequent operation at the will of the operator, the bail 57 is rocked (counter-clockwise in Fig. 1) to engage the tail 55 of the rocker arm 53. In that event the operation of the feed and holding pawls, and the consequent movement of the ratchet plate 70, is operable as before to set the value in the ratchet plate 70. However, the rocker arm is locked against rocking by means of the holding bail 57, the spring '76 enabling the ratchet plate 70 to be adjusted to a proper differential position while the rocker arm is held stationary. In this manner a value can be stored in the ratchet plate 70 for use at any subsequent time, the value being set in the selection mechanism whenever the bail 57 is rocked to its disengaging position shown.

A second embodiment of my invention is shown in Figs. 4 to 9, inclusive. In this embodiment the differential, or progressive, feeding of the values into the selection mechanism is controlled by the reciprocal motion of a bar across the front part of the machine, and is particularly adapted to insert a value of 5 in one order while progressively feeding values of 0 and l to 9" into the next higher order of the keyboard, as is required in the extraction of square root by the method shown and described in the Ellerbeck application, 8. N. 279,832 above-mentioned. in this embodiment I prefer to set the

selection gates

30 and 31 by a pair of arms 110 and 111, respectively. These arms can be mounted in the machine in any desired manner, but preferably are pivotally mounted on riveted

studs

112 and 113 secured to the crossbar 114, which also pivotally supports the forward end of the

gates

38 and 31. The arms 110 and 111 are provided with riveted

pins

116 and 117, respectively, which engage the forward end of the

gates

30 and 31. The conventional compression spring which urges the gates and their associated gears 38 to their extreme or 0 value, positions, is also operative to keep the

pins

116 and 117 in engagement with the

gates

30 and 31. The opposite ends of the arms 110 and 111 are provided with noses 118 and 119, respectively, which engage the peripheral edges of

cams

120 and 121, respectively (shown in Figs. 7 and 8, respectively). These cams are rigidly secured to a common cam shaft 122 which is journalled in crossframe members 123 and 124 (see Fig. 5). It is thus obvious that the differential rotation of shaft 122, operating through the fixed'cams 12d and 121, will position the arms 110 and ,111, respectively, to represent a value corresponding to the angular position of the shaft 122.

The cam 120 is adapted to engage the arm 110, to set the gate 30 in a value corresponding to O or to the first adjusted position which represents a value of 5 on the corresponding gear 38. Therefore, the cam 30 has a peripheral edge having two radii, one corresponding to the value of "O" and the other corresponding to the value of- 5, Thus, the rotation of the shaft 122 for values corresponding from 0 to "4 will permit the gate 30 to lie in its extreme counter-clockwise position (as viewed in Fig. 4) with the arm 110 also rocked to the extreme counter-clockwise position. However, as the shaft 122 rotatesfroni values of 4" to 5," the arm 110 will be rocked to rock the gate 31) to the 5 position, and will be held'in such positioii until the shaft returns to the 0 position.

The cam 121, rigidly secured to the same driveshaft 122 is a double stepped cam with two series of steps corresponding to the values of 0 and l to 4, inclusive, as shown in detail in Fig. 8. The differential rotation of shaft 122 will therefore be operative to rock the arm 111 to position the gate 31 in the positions corresponding to the values of 1" to "4 as above-described, after which the series will be repeated while the cam holds gate 30 in the 5 position.

In this embodiment the progressive feed of the values into the selection mechanism is provided by the reciprocation of a feed bar suitably mounted in the front of the machine, and operated by any suitable mechanism, to reciprocate the bar once for each cycle of machine operation. This feed bar 130 carries a plurality of ordinally spaced feed pawls 131 which are pivotally secured thereto by any suitable means, such as studs 132. The feed pawls are urged into feeding position (clockwise from the position shown in Fig. 4) by a suitable spring 133 tensioned between a long stud 134 on the right end of the feed pawl and a stud 135 on the feed bar 130. The nose of the feed pawl, when rocked by the spring 133 to the clockwise operative position, engages a ratchet wheel 136 likewise rigidly secured to the stub shaft 122.

Normally the feed pawl is held in a disengaged position by means of a bellcrank 140 pivotally mounted on studs 141 riveted, or otherwise rigidly secured, to the crossbar 123 (see Fig. 5). The left-hand end of the horizontal arm of the bellcrank 140 carries a stud 142 to which is attached a tension spring 143 urging the bellcrank in a counter-clockwise direction. As shown in Fig. 4, the upper edge of the horizontal arm of the bellcrank engages the long stud 134 on the feed pawl 131, thereby rocking the feed pawl counter-clockwise to its disengaged position. Normally the bellcrank 140 is held in its clockwise or inoperative position, against the tension of spring 143 by a plate cam 144 rigidly secured to a cam shaft 145. The cams 144 are each provided with a single depression 146 which are helically arranged around the shaft so that on rotation of the shaft, one, and only one depression will permit the control bellcrank 140 to rock to its counter-clockwise, or operative, position. Thus, all but one of the control bellcranks 140 will be rocked to their inoperative position by the cams 144, and rotation of the shaft 145 will progressively permit one bellcrank at a time to rock to its operative position, whereupon the feed pawl 131 will be rocked by the tension of its spring 133 to engage its associated ratchet wheel 136. Thereupon, the reciprocation of feed bar 130 will be operative to rotate the ratchet wheel and with it the shaft 122 and the

cams

120 and 121 secured thereto.

The assembly'including the ratchet wheel 136, shaft 122 and

cams

120 and 121, can be held in any adjusted position by a suitable holding pawl 155. This pawl can be pivotally mounted on any suitable place in the machine but for simplicity, I prefer to mount it on the stud 112, which also supports the arm 110 previously mentioned. A spring 156 tensioned between an eyelet, or aperture, in the tail of the holding pawl, and a stud 157 on the crossframe member 114, holds the holding pawl in its engaging position.

The feed mechanism of this embodiment is particularly adapted to utilize the method of extraction of square root shown and described in the Ellerbeck application S. N. 279,832 above-mentioned. For this purpose the bellcrank 140 is provided with a'substantially vertical arm 150 which engages a pin 151 on the lower end of each control arm 110. Thus, the rocking of the bellcrank 140 (counter-clockwise from the position shown in Fig. 4) is operative to rock the arm 110 to place a value of in the selection gate 30 simultaneously with the conditioning of the feed pawl 131 for feed of values in the next higher order ofv the selection mechanism. By this means a value of .5 can be placed in one order and the selection mechanism in the next higher order progressively fed integrals'of 1" fro'rn the 0 position to a value of 9."

This mechanism just described can readily be zeroized or cleared by any suitable means .such as a clear rack 160. This rack is mounted for transverse reciprocation by means of slots 152 therein, engaging pins 163 on the crossbar 124. This clear rack 160 is adapted to engage a clear gear 161 secured to the rear end of the shaft 122, if the gear .is rotated from the .0 position. The clear gear is of conventional design, and is shown as having ten teeth with two teeth removed. The clear rack 160 car ries suitable clearing teeth 164 adapted to engage the teeth of the gear 161, if that gear is displaced from its position, and return it to .a "6 position in a conventional manner.

It is believed that the operation of this embodiment of my invention will be readily understood. The ,feed rack Eli} will be cyclically reciprocated with each cycle of machine operation in a desired multicycle operation. Normally each of the control bellcranks 140 will be rocked to their clockwise or inoperative position by the engagement of the lower arms with the periphery of the cams u 144. However, incremental rotation of shaft 145 will rotate a earn 144 ,so that its depression 346 will engage the lower arm of the control bellcrank, permitting the bellcrank to be biased to its counter-clockwise position by the force of its spring 143. In the preferred form shown the rocking of the bellcrank is operative to enter a value of in the arm 110 which controls the position of gate 39 of the right-hand order, and will condition the feed pawl for feeding the ratchet gear 136 in the next higher order to the left. Thereafter the reciprocation of the bar 13% will be operative to rotate the feed cam 13s by any preferred increments of value. In the event the invention of my mechanism is utilized in the extraction of square root in the type of machine as disclosed by Phinney, the next rocking of the shaft 145 will disengage the first bellcrank 14% and enable the control bellcrank of the next lower order, thereby securing an incremental feed of the selection mechanisms, from the higher orders to the lower.

A value placed in a selection mechanism of my invention can be cleared, when desired, by reciprocation of the clear rack 16%, which by engagement of the displaced clear gears 161 will rotate the shaft 122 forwardly to the 0 position, Where the form of the gear and rack blocks further operation of the clear gear.

I claim:

,1. in a cyclically operable calculating machine having a selection mechanism including .ordinally arranged rockable gates and means controlled by the angular position of said gates for determining the value to be entered into said machine, the combination which comprises means including a cam means in each order operative to position said gates, and means for cyclically positioning said cam means.

2. in a cyclic calculating machine having a selection mechanism including ordinally arranged roekable gates and means controlled by the angular position of said gates for determining the value to be entered into said machine, the combination which comprises means including a cam means in each order operative to position said gates, an ordinally arranged cyclically operated means for progressively changing the position of said cam means, and means for enabling said positioning means in a predetermined ordinal progression.

3. in a calculating machine having a selection mechanism including ordinally arranged rockable gates and means controlled by the angular position of said gates for determining the value to be entered into said machine, means for positioning said selection gates which comprises an ordinally arranged cam means operative to position said gates, and means for cyclically changing the position of said cam means.

4. in a calculating machine having a selection mechanism including ordinally arranged rockable gates and means controlled by the angular position of said gates for determining the value to be entered .into said machine, means for positioning said selection gates which comprises an ordinally arranged cam means for positioning said gates, a power operated member and means operate by said member for progressively positioning said preselected cam means by selected increments of motion.

5. The apparatus of claim 4 comprising also means including a cam for conditioning said positioning means for cyclic operation in a predetermined ordinal progression.

6. In a calculating machine having a selection mechincluding in .each order a pair of rockable gates and means controlled by the angular position of said gates for determining the value to be entered'into said machine, means for positioning said selection gates which comprises a positioning arm cooperating with each gate, cam means for positioning each arm, and cyclically operated means for changing the position of said cams by selected increments of motion.

7. In a calculating machine having a selection mechanism including pairs of rockable gates and means controlled by the angular position of said gates for determining the value to be entered into said machine, means for cyclically adjusting .the angular position of said gates which comprises the combination of a cam means associated with each pair of gates and operative to rock the gates an amount representative of the values 0 and "1 to 9, inclusive, means for differentially positioning said cam means, and means for cyclically operating said positioning means.

8. The mechanism of claim 7 comprising also means for holding said positioning means in an adjusted position.

9. The apparatus of claim 7 wherein the positioning means comprises a ratchet device, and the means for cyclically operating the positioning means includes a feed pawl for positioning said ratchet device and means including a .cam for positioning said feed pawl in operating position.

10. The apparatus of claim 7 comprising also spring means for positioning said cam from the position of said positioning member, and means for locking said cam means against movement.

11. The apparatus of claim 7 including also means including a cam for conditioning said positioning means for cyclic operation in a predetermined ordinal progression.

12. In a calculating machine having a'selection mechanism including ordinally arranged pairs of rockable gates and means controlled by the angular position of said gates for determining the ordinal values to be entered into said machine, means for cyclically changing the angular position of said gates in a predetermined progression which comprises the combination of a cam means associated with each ordinal pair ofgates and operative to rock the gates an amount representative of the values 0 and l" to 9, inclusive, ordinally arranged means for difierentially changing the position of said cam means, cyclically operated means for operating said positioning means, and means for progressively enabling said ordinal positioning means.

13. In a calculating machine having a selection mechanism including a pair of rockable gates, one of which is settable to a 0 or a 5 position and the other of which is settable to two series of O and'l to 4 positions, and means controlled by the angular position of said gates for determining the value to be entered into said machine, means for cyclically adjusting the angular position of said gates which comprises a cam means operative to position the gates of each pair, said cam means having a cam face operable to rock the firstmentioned t gate to 0 or 5 positions and another face operable to rock the second-mentioned gate through two series of 0 and 1 to 4 positions, means for differentially positioning said cam means, and cyclically operated means for controlling saidpositioning means.

14. In a calculating machine having a selection mechanism comprising a pair of rockable gates and means controlled by the angular position of said gates for determining the value to be entered into said machine, means for cyclically adjusting the angular position of said gates which comprises the combination of a cam means lying between the gates of each pair, said cam means having camming edges adapted to rock the gates an amount representative of the values 0 and 1 to 9, inclusive, a ratchet plate resiliently connected to each of said cam means, a feed pawl for positioning each said ratchet plate, and means including a cam for positioning successive of said feed pawls in operating position.

15. In a calculating machine having an ordinally arranged selection mechanism comprising a pair of rockable gates in each order and means controlled by the angular position of said gates for determining the value to be entered into said machine, means for positioning said selection gates which comprises a positioning arm cooperating with each gate, ordinally arranged cam means for positioning each arm, a ratchet gear associated with each ordinal cam means, a feed pawl for rotating said ratchet gear, drive means for cyclically operating said feed pawl, and means including a cam for positioning successive of said feed pawls in operating position.

References Cited in the file of this patent UNITED STATES PATENTS