US2310280A

US2310280A - Calculating machine

Info

Publication number: US2310280A
Authority: US
Publication date: 1943-02-09
Anticipated expiration: 1960-02-09

Description

Feb. 9, 1943. c. M.- F. FRiDEN 1 CALCULATING MACHINE Filed. June 19, 1935 5 Sheets-Sheet l FIB E FIEJEL ATTORNEY Feb. 9, 1943. c, FRlDEN 2,310,280

CALCULATING MACHINE Filed June 19, 1935 5 Shets-Sheet 2 FIG 4 145 1/ 1/2 J//J/6 !7 TTORNEY Feb. 9, 1943. c. M. F. FRIDEN CALCULATING MACHINE Filed June 19, 1935 5 Sheeis-Sheet 3 INVENTOR Car/ M f fr/oe/ ATTORNEY Feb. 9, 1943. c. M. F. FRIDEN CALCULATING MACHINE Filed June 19, 1935 5 Sheets-Sheet 4 I iWENTOR (a/v A4. f." Fr/a en ATTORNEY Feb. 9, 1943. c FRlDEN 2,310,280

CALCULATING MACHINE Filed June 19, 1935 5 Sheets-Sheet 5 h All! INVENTOR. Car/ M. f Fr/oer;

A TTORNEY Patented Feb. 9, 1943 CALCULATING MACHINE Carl M. F. Friden, Oakland, Calif., assignor to Friden Calculating Machine 00., Inc., a corporation of California Application June 19-, 1935, Serial No. 27,338

18 Claims.

My invention relates to calculating machines for performing addition, subtraction, multiplication, and division, and more particularly to machines of the type having an ordinally shiftable accumulator or register carriage.

It is an object of the invention to provide a calculating machine having an improved register carriage shifting mechanism.

Another object of the invention is to provide an improved calculating machine having a register carriage which can be shifted easily and quickly by power driven means without the possibility of accidental interference with other parts of the machine.

Another object of the invention is to provide an improved calculating machine in which the carriage shifting mechanism is driven from the actuating mechanism which serves to introduce values into the machine.

Another object of the invention is to provide an improved calculating machine in which an incorrect registration cannot occur during shifting of the carriage.

Another object of the invention is to provide an improved calculating machine in which an incorrect registration cannot occur when the value entering actuating mechanism is operated while another machine operation such as carriage shifting is being carried out.

Another object of the invention is to provide an improved calculating machine of the type having a unidirectionally rotatable actuator and bidirectionally rotatable numeral wheels which attains the foregoing objects.

' Another object of the invention is to provide an improved calculating machine of the type having a unidirectionally rotatable actuator and bidirectionally rotatable numeral wheels in which the shiftable carriage can be moved from one ordinal position thereof to any selected ordinal position by manipulation of control keys.

Other objects will appear from the following description and the drawings. In the drawings Figure 1 is a full-size vertical longitudinal section of the rear part of the machine taken in a plane immediately to the right of the mechanism of lowest order and illustrating the relation of the accumulator and revolutions counter to the actuating and selecting means therefor, certain gears being shown schematically. The plane of the section is indicated by the line l-! in Fig. 4.

Figure 2 is an enlarged detail elevational view of a portion of Figure 1 as indicated by the line 2-2 in Figure 1. The figure is partially broken away to illustrate the construction more clearly.

Figure 3 is an enlarged detail elevational view of a portion of Figure 1 as indicated by the line 3-3 in Figure l, a part of the figure being shown in section to illustrate the construction more clearly.

Figure 4 is a fragmentary plan view of the portion of the machine illustrated in Figure 1 with the carriage and keyboard'mechanism removed.

Figure 5 18 a rear elevational view of the carriage and the carriage shifting mechanism as indicated by the line 55 in Figure 1.

Figure 6 is an elevational view of the operation controls of the machine as viewed from the left of the control plate on which such controls are mounted.

Figure '7 is a view illustrating a part of the carriage shift controls as viewed in elevation from the right, and showing another part in section as indicated by the line 'll in Figure 4.

Figure 8 is a fragmentary elevational view of a portion of the carriage shift controls as viewed from the left.

Figure 9 is a vertical longitudinal section of the rear part of the machine, similar to Fig. 1 but is taken through the axis of one of the actuating shafts with certain parts shown in elevation and with other parts omitted to obtain clar- 'ity.

Figure 10 is a fragmentary plan view of one of the actuating shafts and the mechanism associated therewith. The view is generally similar to Fi 4.

Figure 11 is a transverse sectional elevation of mechanism shown in Fig. 10 as indicated by the line |l-H in Fig. 10.

Figure 12 is a fragmentary perspective view of the actuating means for the revolutions counter.

Figure 13 is a fragmentary transverse section- 9.1 elevation of one order of the revolutions counter actuating means.

I have shown my invention as embodied in the type of calculating machine having a unidirectionally. operable actuator and reversible or bidirectionally operable numeral wheels, as disclosed for example, in my co-pending application, Serial No. 724,482, filed May 8, 1934, to which reference is made for a complete disclosure of features of this type machine which are not disclosed herein. While certain features of my invention are adapted particularly for use in this type of machine, it is to be understood that certain of such features and other features of my invention can be applied to other types of calculating machines.

The machine disclosed herein includes base I 0 Side members l2, l3 are connected by cross frame members l6, |8 (Figs. 1 and 4) and |9 (Fig. 1) which serve to mount various mechanisms described more particularly hereinafter. The accumulator register comprises a series of reversible numeral wheels 2| in register carriage 22 which is mounted for endwise shifting movement laterally of themachine ineither direction to variousordinal positions thereof on rollers 26 journalled on cross frame members |6, |9. The values to be introduced into the machine are determined by a plurality of orders of settable value keys 23 and power driven actuatingmeans controlled by plus key 260 and minus key 2M. The number of actuations of accumulator numeral wheels 2| are registered in counter numeral wheels 24. The above identified mechanisms will now be described in greater detail.

The registration of values is elfected cyclically by operation of the actuating means from electric motor 25 (Fig. 1) through a cyclic clutch 26 (Figs. 4 and 6). Motor 25 has driving pinion 21 which is connected by idler gear 28 with drive gear29 of clutch 26.

The clutch determines cyclic operation of the machine and is constructed to provide for ready control thereof during high speed operation.

Driving clutch gear 29 (Figs. 4 and 6) is mounted for rotation on driven shaft 3| (Fig. 6) and has driving element or ratchet 32 secured thereto. The driven element of the clutch includes disc 36 secured on transverse shaft 3| (Fig. 4) which is suitably journaled in side members |2, |3. Gear 29 and ratchet 32 are held in proper position on shaft 3| between disc 36 and gear hub 31 pinned on shaft 3 I. The connection between driven element 36 and ratchet 32 is provided by clutch pawl 38 (Figs. 4 and 6) pivoted on pin 39 between disc 36 and cam ring 48 secured thereto. To limit pivotal movement of pawl 38 (Fig. 6), slot 4| is formed therein to engage pin 42 secured between disc 36 and ring 48. Intermediate its ends, pawl 38 has nose or tooth 43 which is positioned for engagement with the teeth of ratchet 32 as controlled by the pivotal position of the pawl which is normally urged to clutch engaging position by spring 44, tensioned between the movable end of pawl 38 and disc 36. In the disengaged or full cycle position shown in Fig. 6, stop extension 46 of pawl 38 is engaged by pivotally mounted clutch control lever 41 to maintain nose 43 out of the path of the teeth of ratchet 32. To engage the clutch, lever 41 is oscillated out of engagement with the stop 46 so that spring 44 becomes effective to engage nose 43 with ratchet 32, and the clutch is engaged for one or more cycles of rotation depending upon the re-engagement of lever 41 with stop 46. Thus, disc 36 and transverse shaft 3| are operable cyclically and in one direction as controlled by lever 41. During rotation of the clutch, lever 41 is maintained in'clutch engaging position by roller 48, mounted thereon in operative relation with cam ring 48. Ring 46 is provided with a peripheral depression into which roller 48 falls when the clutch is in full cycle position. The actuating means and the clutch are maintained in full cycle position by the engagement of lever 41 with stop extension 46 of pawl 38, and by spring urged pawl 49 (Fig. 1) which engages seat 56 in cam disc I26.

From transverse shaft 3| a plurality of longitudinally extending actuating shafts are driven in a one to one gear ratio to provide a drive for the actuating elements of the machine. Shaft 3| (Fig. 4) has suitable bevel gear connections 5| with longitudinal shafts 52 (Figs. 1, 4, 9 and 10) which are suitably journalled in cross members l1, l8. Each shaft 52 (Figs. 9-11) carries a pair of actuating

elements

53, 53A, which are associated with the two adjacent orders of the machine. Each element '53 is identical and comprises a cylinder having respective sets of stepped

teeth

56, 51 for cooperation with the selecting mechamsm.

The values set into the machine are determined by the relative positioning of ten-tooth gears 58, 59 (Figs. 1 and 9-11) slidably mounted on two part square register driving shaft 6|, which is journalled in cross members I6, I! and I8 and can be disconnected at

member Gears

58, 59 have associated therewith respective slides 62 which extend rearwardly to cooperate with a bank of keys 23. Slides 62 are mounted for endwise movement on a plurality of similar pivoted links 63 (only one of which is shown) which are spring pressed as by spring 64 to urge slides 62 to their forward position where gears 58, 59 do not register with stepped

teeth

56, 51. By depression of a key-23 one of

gears

58, 59 is placed in alignment with the associated stepped teeth, 56 for example, so that shaft 6| is driven a num-- ber of increments of movement corresponding to the depressed key upon rotation of the associated actuating cylinder 53.

Gears

58, 59 are maintained in proper relation to

teeth

56, 51 by springpressed ball 66 and ten-tooth gear 61 on shaft 6|. The structure of the actuating and selecting mechanisms is disclosed more fully in my copending application referred to above.

From the foregoing description it is seen that upon rotation of actuating cylinders 53 a value as determined by the depressed keys 23 is registered on numeral wheels 2| in terms of increments of rotation of associated shafts 6|. Because of the axial off-setting of

cylinders

53, 53A only one actuating shaft 52 is required for each two orders of the machine, the two associated register driving shafts 6| being spaced slightly to the right and left respectively of shaft 52.

To transfer the increments of movement of shaft 6| to corresponding numeral wheel 22, spool 7| is slidably mounted on shaft 6| between plates I6, I! and has respective ten-tooth plusminus gears I2, 13.

Gears

12, 13 are adapted to mesh with ten-tooth gear 14 on numeral wheel shaft 16 suitablyvjournalled in upright position in carriage frame 17. 1| either to the right or left as viewed in Figs. 1 and 9, either

gear

12 or 13 can be meshed with gear 14 to cause rotation thereof selectively ineither direction. To prevent overthrow of numeral wheels 2|, each shaft I6 has tentooth gear 18 engaged by spring-pressed ball 19.

The shifted position. of all spools 1| (Figs. 1, 4, 9 and 10) in the machine is controlled simultaneously by virtue of the positioning of spools 1| in parallel relation on strap or bail 8|,- which fits closely between gears l2, l3. Strap 8| is mounted for pivotal movement by arms 82 on shaft 83. Thus, by rocking shaft 83 and oscil-' By shifting spool I spect to strap 8| and to accurately determine the neutral position thereof and of gears I2, 13, the upper ends of arms 86, 86 (Figs. 1 and 2) engage eccentrically mounted stop 92 having of! center portion 93 positioned in side member I2. Stop 92 is held in adjusted position by :nut 94 threaded thereon and compressing a suitable spring washer. Because of eccentric movement of stop 92, the position of

centralizer arms

86, 81, and consequently of plus-minus gears I2, I3, can be easily and accurately adjusted.

Tens transfer mechanism for accumulator numeral wheels 2I is associated with plus-minus gears I2, I3, which may be conventional construction and as shown is generally of the form described in said co-pending application. Generally, such mechanism includes transfer gear 96 (Figs. 1 and 9) shiftably mounted on shaft H and movable by the numeral wheel of next lower order into the path of single tooth actuator 91 (Figs. 1, 4 and 9). Actuators '91, 91A (Fig.

4) for adjacent transfer gears 96 are offset.

axially on associated shaft 52. Numeral wheels 2I are zeroized as described in said application by manipulation of handle 98 (Fig. 1).

Revolutions counter mechanism The revolutions counter or counting register including numeral wheels 24 (Fig. 1) is mounted in carriage 22 and has associated therewith an actuator mounted in the frame of the machine and which is constantly connected with the accumulator actuating means for registering both positive and negative increments on numeral wheels 24. Each numeral wheel 24 is secured on shaft IOI which has one end removably journalled in carriage frame 71 and the other end in cross bar I02 removably connected with frame II by suitable end plates (not shown). Spring I03 seated in bar I02 urges shaft IOI against carriage frame II to maintain proper positioning of numeral wheel 24 and associated parts. Shafts IOI are spaced ordinally to correspond to the spacing of accumulator numeral wheels 2|.

In order to actuate or introduce values into the revolutions counter there is provided an actuator including a member I06 (Figs. 1 and 4) which has a compound motion having two major components, one a translatory reciprocation and the other a rotary oscillation. That is, the members or shaft I06 is mounted in side frame members I2, I3 to move from end to end and to be rocked back and forth about its axis. Mounted on shaft I06 (Fig. 4) is a pair of collars I01 each of which is extended to support a pair of parallel rods I08 and I09. Mounted freely on shaft I06 between rods I08, I09 is a plurality of actuator spools IIO (Figs. 1, 4, 12 and 13) which in general are identical and provide for ordinal spacing of the actuator elements thereon. Spool III of lowest order at the right end of shaft I06 is only partially complete and carries actuator element or finger II2 (Figs. 1 and 4) which projects radially between ten-tooth gear II3 (Fig. 1) and single-notch disc II4 secured in spaced relation on shaft IOI.

Finger II2 (Fig. 1) is connected by spring II6 to rod I08 so that it is urged in a clockwise direction, as seen in Fig. .1, about the shaft I06. Such movement of finger H2, however, is restrained by projection II! of spool III which engages beneath rod I09. By this means, spool III and finger II2 move positively withishaft I06and rods I08, I09 during counter-clockwise movement thereof and move yieldingly there with during clockwise movement. As seen in Fig. 1, clockwise movement of shaft I06 and rods I08, I09, under the urgency of spring II6 moves finger II2 between successive teeth of gear II 3, which are maintained in proper alignment by an overthrow preventer including tentooth gear H8 and spring-pressed ball II9. When finger H2 is positioned between adjacent teeth of gear II3, the rotary oscillation of shaft I06 is interrupted and the shaft is translated axially toward the left, as seen in Fig. 4, for instance. Such movement, since finger II2 remains intermediate successive teeth on the tentooth gear I I3, is effective to rotate the shaft IOI for one tenth of a complete revolution, and thus to advance the associated numeral wheel 24 positively for one successive digit.

At the conclusion of such axial movement toward the left, shaft I06 again oscillates, but in counter-clockwise direction, so that finger II 2 is rotated positively, due to the contact of rod I09 against projection I ll, into the position seen in Fig. 1 in which finger I I2 is out of mesh with gear H3. The return axial movement of shaft I06 toward the right, as seen in Fig. 4, therefore, restores the parts to their original position. By the described operation, the numeral wheel 24 in ordinal alignment with finger H2 is advanced one unit.

It is especially pointed out that if, when shaft I06 initially rotates to mesh finger I I2 with tentooth gear II3, such meshing movement is followed by an axial translation of the shaft I06 toward the left (Fig. 4), the numeral wheel is advanced in a positive direction. On the other hand, if, following the initial meshing movement of finger II2 with the gear II3, the axial translation of shaft I06 is toward the right, then the direction of movement of shaft I!" and numeral wheel 24 is subtractive or negative.

Spool III and its associated actuator finger H2 re ister on the aligned numeral wheel 24 the number of actuations occurring in that ordinal position of the carriage; The other spools IIO form part of the tens transfer mechanism which will now be described. Spool IIO (Figs. 4, 12 and 13) adjacent spool III of lowest order isprovided at its left-hand end with actuator finger I2I, similar to finger I I 2 of spool I I I, and is also provided at its right-hand end with finger I22 (Figs. 1, 4 and 13) which is bent to be co-planar with finger H2 and has projection I23 engaging finger II2. Thus, spring H6 of the tens order, for instance, as seenin Fig. 4, is effective to urge finger I22, and particularly its projection I23, into contact with the finger II2 of the units order. However, spool III of the units order cannot yield because its projection I I I is in contact with rod I09. However, when rod I09 is oscillated about the axis of shaft I 06, finger I22, under the urgency of its spring I I6, is free to follow finger II2, providing the notch in disc II4 (Fig. 13) is in position therefor. Spools H0 of higher order are similarly formed, finger I22 of each spool IIO overlapping and engaging finger I2! of spool I I0 of next lower order.

In order to effect the tens transfer, .discs II4 not pass by the barrier of disc II4, thenthe tens order spool I I cannot rotate about the axis of the'shaft I06 and, correspondingly, due to the interlocking relationship of fingers I2 I, I22 of the remainder of the spools 0 for the higher -orders, maintains all such higher order spools stationary. But on the other hand, if the tenscarry notch in the units order disc H4 is in its 9 position during addition to permit passage of the finger I22, then such finger rotates along with the finger H2 and causes a corresponding rotation of the tens order spool I I0, and finger I2I thereof is effective upon its initial axial movement thereof on gear II3 of the tens order in the revolutions counter to rotate shaft IOI and numeral wheel 24 through one-tenthof a rotation and thereby effect the tens-carrying operation. Correspondingly,- if the units numeral wheel stands at 0 in a subtractive operation, the rocking movement of finger I2I, I22 is delayed until the initial axial movement thereof aligns finger I22 with the notch of the associated disc, so that finger I2I engages gear II3 of the. -ens order to effect a negative transfer during the return axial movement of the actuator. A similar action occurs in all higher orders to effect a tens-carrying operation.

The rotary oscillation of the shaft I06 is produced in synchronism with the rotation of the transverse shaft 3|. At the end of the shaft 3| (Fig. 4) which projects through side frame member I2, there is mounted a cam disc I26 having cam groove I21 formed therein. Cam follower I28 (Fig. 1) projecting from one arm I29 (Figs. 1 and 4) of a bell crank generally designated I3I and pivoted as at I32 on side member I2 engages groove I21.' Bell crank I3I is likewise provided with arm I33 which is forked to engage pin I34 on crank arm I36 secured on the shaft 106 inside of frame member I2. Pin I34 projects through a suitable aperture in plate I2 and is of sufficient length to maintain the operative relation of bellcrank I'3I and arm I36. The contour of cam groove I21 is such that bell crank I3I is oscillated during each cycle of rotation of actuating shaft gaged with its corresponding groove I42, I43 in drum I4I. Sleeve I5I is shown in Fig. 1 in its central position when pin I51 is engaged slightly with groove I42 and pin I59 is just out of engagement with groove I43.

To'place sleeve I5I in either desired extreme position, I provide on sleeve I5I, annular groove I66, which is engaged by shifting pin I61 projecting through side member I3 from lever I68 (Fig. 6) on shaft I69. Thus, oscillation of shaft I69 serves to shift sleeve I5I along shaft I52. In

3I, and, through crank arm I36 causes a comparable oscillation of shaft I06.

The longitudinal or axial translation of the shaft I06 is .provided by a mechanism illustrated in Figs. 1 and 4, by means of which the phase relationship of the oscillation and reciprocation of shaft I06 can be varied. Cam drum I4I (Fig. 4) is mounted on shaft 3I adjacent side member I3 and has a pair of grooves I42 and I43 cut therein. Cam grooves I42, I43 are of identical contour but are polarly or angularly spaced from each other, and means are provided for optionally engaging either of the grooves I42 and I43. To

this end, I. provide sleeve I5I (Fig. 1) mounted freely on vertical shaft I52 secured in a pair of spaced brackets I53 on side member I3. The lower end of sleeve I5I is united to lever arm I56 which carries follower pin I51 at its end in operative relation with groove I42 in drum I4I. On the upper end of sleeve I5I is lever I58 at one extremity of which follower pin I59 is prothis fashion, either pin I51 is introduced into groove E42 so that the shaft I06 reciprocates in phase relationship with the characteristics of the groove I42, or, conversely, pin I59 is engaged in groove I43 so that shaft I06 in such circumstances partakes of the reciprocatory movement imparted by cam groove I43.

Thus, as transverse shaft 3I rotates, it imparts to the shaft I06 an axial translation in either selected one of two different phase relationships with shaft 3I. The phase relationship which is selected in a particular instance controls the direction of rotation of the numeral wheels 24 in the revolutions counter as described above.

Means are provided for manually setting the revolutions counter actuator to reverse the direction of actuation thereof irrespective of the type of actuation determined for the accumulator numeral wheels. Shaft I69 (Fig. 6) carries axially oifset oppositely extending arms I1I, I12 have pins I13, I14 on the facing sides thereof adapted for selective operative relation withopposite vertically spaced notches formed in diamond-shaped frame I16 secured on slide 234 in spaced relation therefrom. Arm HI and pin I13 lie on one side of frame I16 and arm I12 and pin I14 on the opposite side thereof, so that axial shifting of shaft I69 is effective to determine which of pins I13, I14 is to be operatively engaged with frame I16 and slide 234. As described hereinafter, slide 234 is moved in one direction upon depression of plus key 200 and in the other direction upon depression of minus key 20I. Therefore, if pin I13 be engaged with the corresponding shaft I69, through arm I68, pin I61, and sleeve I5I (Fig. 1) controls the direction 'of actuation of revolutions counter numeral wheels 24. It will also be seen that by shifting shaft I69 (Fig. 6) to disengage pin I 13 and engage pin I14 with frame I16, the direction of oscillation of shaft I69 for a given direction of movement of slide 234 is reversed and hence the direction of actuation of numeral wheels 24 is also reversed. Such axial movement of shaft I69 is controlled by control lever I8I pivoted on plate 202 and having arcuate cam sector I82 engaging enlarged end I83 of shaft I69 and operating in a manner fully disclosed in said co-pending application. Lever I8I is latched resiliently in either position thereof by spring-urged pawl I84. Spring-urged pawl I86 engages a notch in end I83 to maintain alignment of pins I13, I14 with the respective notches in frame I16. Thus, the revolutions counter can be set to give true figure results or complements thereof.

Plus and minus keys Manually operable means in the form of plus and minus keys are provided for controlling selective positive and 'negative registration on the numeral wheels. Keys 200, 20I (Fig. 6) are similar and are mounted for endwise movement thereof on control plate 202 by suitable slots engaging pins 203; Suitable springs (not shown) connected to ears 204 on the key stems

urge keys

200, 20! to their upper inactive position. Both

keys

200, 20!, upon depression thereon serve to engage the clutch and energize the motor to cause one or more cycles of movement of the moved to the left, as viewed in Fig. 6 by a pin 206 acting against a cam surfacef201. Adjacent its left or rear end, slide 208 has vertical slot 2!! which is engaged by pin 2!2 on the short upper arm of clutch control lever 41. Therefore, the movement of slide 208 caused by depression of a key 200, 20! is effective to oscillate lever 41 to engage the clutch.

To energize the motor by movement of

keys

200, 20!, slide 208 is slotted to receive pin 2l4 at the upper end of lever 2|5 which is suitably pivoted intermediate its ends at 2 I 6 on side frame member !3 (Figs. 6 and '7). At its lower end, lever 2l5 has a suitable pin and slot connection with the upper end of lever 2 !1 also pivoted intermediate its ends on side member !3. At the lower end of lever 2I1, pin 2l8 of suitable insulating material is provided in overlapping relation with spring contact 2!9 (Fig. '1) which, with contact 220, forms part of the motor circuit. Through the described linkage, the movement of slide 208 caused by depression of a key 200, 20! is effective to engage contacts 2 I9, 220 and energize the motor. The described linkage is also effective upon release of the depressed key to return slide 208 to the inactive position shown in Fig. 6 by action of the displaced spring contact 2 !9, so that machine will stop at the end of the cycle of actuation then in progress because of the return of clutch control lever 41 to clutch disengaging position.

From the foregoing it is seen that depression lation of shaft 83 (Fig. 1) serves to engage gears 13, or gears 12 with numeral wheel gears 14.

' When gears 12 and 14 are meshed, positive regisof either key 200, 20! is effective bymovement of slide 208 to engage the clutch and energize the motor. The movement of slide 208 also provides an interlock between

keys

200,20! as depression of one of such keys moves a lock portion 22! (Fig. 6) of slide 208 into blocking relation with the flat bottom surface of pin 206 of the undepressed the direction of registration on the numeral faces 232, 233 on plus-minus slide 234. Slide 234 is supported for endwise movement by link 236 having respective pivotal connections with plate 202 and with one end of. slide 234, and by arm 231 pivotally and adjustably connected to the other end of slide 234 and mounted on shaft 83. Thus, selective depression of

keys

200, 20! serves to move slide 234 forwardly or rearwardly of the machine and to oscillate arm 231 and shaft 83 in opposite directions. As described above, osciltration is determined, and when gears 13 and 14 are meshed, negative registration is determined. Therefore,

keys

200, 20! (Figs. 6) by selecting either set of

gears

12 or 13 for meshing with gears 14 determine the sign character of the registration on thenumeral wheels.

Latch means are provided in cooperative relation with the plus and minus keys to positively maintain the control exerted by such keys until a depressed key is released. Latch arm 24! (Fig. 6) is pivoted at 242 on plate 202 and has its free end held against the upper side of plus key roller 23! by spring 243 connected between arm 24! and plate 202. Nose 244 of arm 24! is adapted for latching engagement with notch 246 at the top of cam surface 232 upon depression of plus key 200 and the consequent rearward movement of slide 234. Latch arm 24!, therefore, insures proper meshing of gears 12, 14 while plus key 200 is depressed. Upon release of plus key 200, roller 23! thereof strikes arm 24! and moves it to inactive position permitting return of slide 234 and gears 12 to inactive position. Because of the overlapping relation of slide 208 with pin 206 on key 200 and the fact that slide 208 is held in drive-establishing position until near the end of the cycle by clutch control lever 41 and roller 48 thereon, latch arm 24! is not engaged and released by roller 23! until after all increments of movement have been entered in the numeral wheels. Latch arm 245 pivoted at 241 on plate 202 and having nose 248 cooperable with notch 249 in slide 234 operates in connection with minus key 20! in the manner described above with respect to latch arm 24! and plus key 200. Thus, slide' 234 and plus-minus gears 12, 13 are maintained positively in mesh throughout operation controlled by plus and minus keys 200, 20 I.

Division mechanism The calculating machine is also preferably provided with automatic division mechanism for performing a plural order division operationas disclosed in my said co-pending application. Only a part of such mechanism is disclosed herein for illustrative purposes. Manually operable division control means is provided in the form of lever 26! (Fig. 6) pivoted at 262 on control plate 202. Movement of lever 26! from its illustrated position forwardly of the machine, in the direction of the arrow, serves to condition the machine for the division operation and return thereof serves to initiate such operation. The lower end of control lever 26! isv positioned for engagement with roller 263' on slide 264 which is mounted for endwise movement by a plurality of suitable slots engaging pins 266 on plate 202. Spring 261 urges slide 264 to the right to hold roller 263 against lever 26!. At its rear end, slide 264 has roller 268 abutting downwardly extending arm 269 of bell crank lever 21!, which is pivotally supported on pin 212 at the upper end of division operation control arm 213. Arm 213 has its lower end pivoted at 214 on plate 202. Notch 216 is provided at the end of arm 269 -for cooperation with pin 211 adjustably mounted on plusminus slide 234' to connect slide 234 and division control arm 213. When division lever 26! is moved forwardly, slide 264 moves rearwardly, and through roller 268' rocks bell crank lever 21! to engage notch 216 with pin 211. Thus, the auto plate 282 and having spring 281 associated therewith. Vertical arm 288 of lever 284 is operatively engaged with pin 289 adjustably mounted on clutch actuating slide 288 to provide for accurate positioning thereof with respect to arm 288. It is seen, therefore, that clockwise (Figure fi) movement of lever 261 through slide 264, bell crank lever 211, link 282, and bell crank lever 284 serves to move clutch actuating slide 288 rearwardly and'thereby engage the clutch as previously described. It will be recalled that such movement of slide 288 through levers 215,

211 moves contact 219 (Fig. '1) toward contact 228 into circuit closing position. However, in division the circuit is not closed by such movement as contact 228 has been moved out of its normal circuit closing position by pin 291 (Figs. 6 and '1) formed of suitable insulating material and mounted on slide 264. Upon release of division lever 261, slide 264 moves forwardly to the position shown in Fig. 6 and contact 228 moves into engagement with contact'219 to close the motor circuit and start the divisionoperation.

Shifting mechanism Means are provided for shifting the carriage in either direction from one ordinal position to another by power driven means controlled by manually operable keys. Preferably, the power driven means comprises the actuating means for entering values into the accumulator register. Carriage 22 (Fig. 5) has plate 381 mounted along the rear side thereof by means of adjusting screws 382 threaded in brackets 383 on the,

carriage and having smooth ends pivotally engaged with projecting end portions 384 of plate 381. Plate 381 is secured against pivotal movement on screws 382 by clamping screw 386. Plate 381 has vertical slots 381 formed in the lower edge thereof by teeth 388, slots 381 being spaced apart a distance equal to the ordinal spacing of the machine and aligned with drive Slots 381 are adapted for engageshafts 61. ment by opposite shift pins 311 on shift gear 312. Gear 312 is journalle'd on cross frame member 16 and. is rotated by means described later to shift the carriage by virtue of the engagement of pins 311 in slots 381; such engagement I also serves to lock the carriage in position. One

half revolution of gear 312 effects one ordinal spacing of carriage 22 and to provide for accurate centering of the carriage at the end of a shift, centralizing cam 3l6 (Figs. 1, 4 and 5), is mounted for rotation with gear 312. Centralizing arms 311 (Figs. 4 and 5) pivoted at 318 on frame member 16 have respective rollers 319 engaging opposite sides of cam 316 under the influenceof spring 328 tensioned between arms 311. When pins 311 are in horizontal alignment the carriage is properly positioned and rollers 319 (Fig. 5) are seated in opposite depressio'ns formed between the high portions of cam 316. Accurate initial positioning of carriage 22 with respect to pins 311 is provided by adjusting screws 382 which are adjusted with the parts positioned as described.

Yieldable means are provided to prevent shifting of the register carriage beyond the lowest and highest ordinal positions thereof. End slots 381A are formed in part by plate 381 and in part by respective similar pawls 326. Each pawl 326 is pivoted at 321 on plate 381 and extends inwardly to position straight edge 328 thereof opposite an end tooth 388 to form an end slot 381A. Pawls 326 are held resiliently in the position shown against respective stop pins 331 by spring 332 tensioned between pawls 326. When carriage 22 is in an end position, one pin 311 lies in an end slot 381A and the other is po-' sitioned beneath adjacent pawl 326 opposite inclined edge 333 thereof. In this condition rotation of gear 312 in a direction to move the carriage beyond the end position merely results in lifting of pawl 326 by action of pins 311 on inclined edge 333. However, upon rotation of gear 312 in a direction to effect carriage shifting to an intermediate ordinal position, vertical edge 328 of pawl 326 positively resists the pin 311 in slot 381A and carriage shifting results. It is seen, therefore, that the carriage cannot be shifted beyond either end position thereof by operation of shift gear 312.

As stated above, shift gear 312 is rotatable in either direction by selectively operable drive connections with the' actuating means of the machine. For this purpose, the two lowest order actuating shafts 52 (Fig. 4) are extended rearwardly and have respective collars 341 secured adjacent the ends thereof. Each collar 341 is provided with diagonally opposite slots slidably engaged by corresponding teeth 342 of a shiftable drive establishing collar 343 mounted freely on the end of shaft 52. Opposite teeth v342 thereof, each collar 343 has smaller teeth 344 adapted for engagement with corresponding slots in

respective gear sleeves

346, 341. which are journalled in cross frame member 16 and small plate 348 mounted on member 16 by spacers 349 and suitable fastening screws. Gear sleeve 341 (Figs. 4 and 5) has gear 351 meshing. with idler gear 352 (Fig. 5) journalled in frame member 16 and plate 348 and also meshing with shift gear 312. Gear sleeve 346 (Figs. 4 and 5) has gear 353 (Figs. 1 and 5) offset axially from idler gear 352 and meshing with wide reverse idler gear 354 suitably joumalled in frame member 16 and plate 348 and also meshing with idler gear 352. Thus, rotation of gear sleeve 346 in a clockwise direction as viewed in Fig. 5 causes counter-clockwise rotation of shift gear 312 and shifting of carriage 22 to the right as viewed from the front of-the machine. Correspondingly, rotation of gear sleeve 341 in a clockwise direction as viewed in Fig. 5 effects clockwise rotation of shift gear 312 and shifting of carriage 22 to the left as viewed from the front of the machine. Thus, by selective establishing of drive connections between gear sleeves 346, 341 (Fig. 4) and collars 341 upon selective shifting of respective shiftable collars 343 carriage 22 can be shifted in either direction. The gear ratios are so chosen that one rotation of actuating shafts 52 eifects one-half rotation of shift gear 312.

Manually operable control means-are provided for the carriage shifting mechanism described above to enable selective shifting of the carriage in either direction through one or more ordinal spaces. Shift keys 31!, 312 (Figs. 7 and 8) are depressible to initiate shifting of the carriage to the right and left respectively as viewed from the front of the machine, and as indicated by the arrows. Depression of either key serves to enable a drive connection from the actuating means to the carriage shifting mechanism during the first part of its downward movement and thereafter to engage the clutch and energize the motor. Keys 31!, 312 (Fig. 7) are mounted for endwise movement by suitable longitudinal slots formed therein and engaged by a plurality of studs 313 secured on side frame member !3. Keys 31!, 312 have adjacent ears 316 with

respective studs

311, 318 mounted therein and extending to either side thereof. To maintain the shift keys resiliently in raised position, coil spring 38! (Fig. 8) is provided having its ends fastened to side member !3 and passing over upper studs 313 and under the ends of

studs

311, 318 which extend through suitable slots in side member !3. To enable the drive connection from the actuating means to the carriage shifting mechanism, stud 311 engages the upper end of arm 382 secured on sleeve 383 (Fig. 4). Sleeve 383 is journalled on transverse shaft 386 which is suitably journalled at its ends in side member !3 and bracket 381 (Figs. 4 and 7) on cross member !8. At its left end, sleeve 383 (Fig. 4) is provided with depending arm 388' (Figs. 7 and 8) having its rounded end in engagement with the front end of rearwardly extending rod 39! (Figs. 4, '1 and 8). Rod 39! is mounted for sliding movement in cross frame members !1, l8 and is resiliently urged to itsforward position by spring 392 compressed between cross member !8 and a suitable washer on rod 39!, At its rear end, rod 39! (Figs. 4 and 7) has shift fork 393 secured thereon with its forkedend in engagement with an annular groove in right-hand shiftable collar 343. From the foregoing description, it is seen that depression of key 31! is effective through stud 311 to rock arm 382, sleeve 383 and arm 388 to move rod 39! rearwardly. Such rearward movement of rod 39! is effective through shift fork 393 to engage teeth 344 of right-hand shift collar 343 with corresponding slots in gear sleeve 346. Thus, initial depression of shift key 31! is effected to enable a drive connection from the actuating means. to the carriage shifting mechanism. The drive connection between gear sleeve 346 and its associated collar 343 determines shifting of the carriage to the right.

A similar mechanism is employed in connection with shift key 312 to enable the drive connection to determine shifting of the carriage to the left. Pin 318 (Fig. 8) is engaged with the upper end of arm 396 (Figs. 4 and 8) having its hub secured on shaft 386. At its left end, shaft 386 (Fig. 4) has depending arm 39'! secured thereon in operative relation with shift rod 398 having shift fork 399 at its rear end in engagement with an annular groove in left-hand shift collar 343, It is seen, therefore, that depression of key 312 results in rocking of shaft 386 and rearward movement of rod 398 to engage lefthand shift collar 343 with gear sleeve 341. This conditions the carriage shift mechanism for shifting of the carriage to the left. It is to be noted that only a small'amount of movement is required to engage teeth 343 with the corresponding slots in

gear sleeves

346, 341 so that the drive connection is enabled during the first part of the downward movement of keys 31!, 312.

The latter part of the downward movement of keys 31!, 312 is utilized to engage the clutch and energize the motor. Studs 311, 318 (Fig. '7) overlie respective cam surfaces 48!, 482 at'the upper end of lever 483. Lever 483 is adjustably secured on lever 2|5 by pivot 2!6 and by pin and slot connection 484 having suitable clamping means for maintaining the relative adjustment between levers 2!5 and 483. From the

relationof studs

311, 318 and cam surfaces 48!. 482, it is evident that depression of either of keys 31!, 312 is effective during the latter part of the movement to rock levers 483 and H5 in a clockwisedirection. It will be recalled that lever 2!5 is connected at its upper end by pin 2!4 with clutch actuating slide 288 (Fig. 6) so that movement of slide 288 will result upon depression of either of the shift keys. Such movement is effective in the manner previously described to engage the clutch. It will be recalled that the motor in energized upon oscillation of levers 2!5, 2!1, Lever 483 (Fig. '7) also provides an interlock betweenshift keys 31!, 312 by means of lock portions 486, 481 which are adapted to cooperate with

studs

311, 318, respectively. For example, if key 31! is depressed, lock portion 481 moves into blocking position beneath stud 318.

Means are provided for maintaining the drive connection from the actuating means to the carriage shifting mechanism throughout each cycle of movement even though the depressed shift key be released immediately after depression thereof and before complete shifting of the carriage.

For this purpose each shiftable collar 343 is provided with a similar mechanism, only one of which will be described. Right-hand shiftable collar 343 (Figs. 4, 5 and '1) is provided with disc 4!! having a cut-a-way portion 4!2 which, in the full cycle position of collar 343, is in the position illustrated in Fig. 5. Immediately to the rear of disc 4! (Fig. '1), locking element M3 is provided mounted in bracket M4 for movement radially of collar 343, and urged to its extended position by spring 4I6. With shiftable collar 343 in its inactive position disc 4!! is positioned forwardly of locking element H3 and when moved to its active position passes by element 4!3 which is in alignment with the eut-a-way portion 4!2'. Upon subsequent rotation of disc 4!! the solid portion thereof engages element M3 and prevents movement of collar 343 forwardly of the machine so that teeth 342 are maintained in engagement with gear sleeve 341 irrespective of release of the associated shift key. Left hand shiftable collar 343 is held in drive establishing position for each cycle of rotation by similar mechanism.

From the foregoing description it is seen that keys 31!, 312 and the associated mechanism provide means for shifting the carriage selectively in either direction from one ordinal position of the carriage to another. Obviously, if a shift key be maintained in depressed position, shifting will continue until the carriage reaches an end position, when, as previously described, continued operation of the shifting mechanism in the same direction becomes ineffective. In a division operation, the carriage shifting mechanism may be controlled by any suitable means, for example in the manner described in said co-pendlng application, to shift the carriage to the right after each ordinal division is completed.

Shift-registration interlock Locking means are provided between shift keys 3', 312 and plus and minus keys 200, 20l to prevent depression of either of keys 3', 312 when a key 200, 2ll| is depressed, and vice versa. For this purpose, plus-minus slide 234 (Fig. 6) has upwardly extending plate 4I6 mounted thereon having transverse notches M1, M8. When

keys

200, 20! are in raised position, notches 4H, 8 are aligned verticallywith laterally projecting vertical ears M9, 420 (Fig. l) on keys 3', 312.

. Upon depression of key 3H,. for example, ear 4l9 Accumulator and counter disabling mechanism In a machine of the type disclosed having power driven shifting mechanism which can be controlled by keys to determine a carriage shift in either direction, and which is automatically controlled in divisionto shift the carriage after an overdraft and the additive correction thereof, and particularly when the shifting mechanism is driven by operation of the actuating means, it is desirable that precautions be taken to prevent any possibility of erroneous registration during a carriage shift. One essential feature is the positive positioning of the plus-minus gears in neutral position during the entire carriage shift so that no possible contact can occur between such gears and the numeral wheels gears through vibration of the parts after the rapid movement of the plus-minus gears to and from active po :rition. Consequently, I have provided latch means positioned at the point of greatest movertnent of the plus-minus gears and which is operated by the carriage shifting mechanism to latch the plus-minus gears positively in neutral or inactive position. For this purpose, latch sli 42! (Figs. 1 3 and 4') is mounted on strap 8| adjacent the right-hand end thereof by means of eccentricportion 422 (Fig. 3) of adjusting screw 423. Screw 423 is clamped in bracket 424 on strap 8| by nut 426. By turning screw 423 eccentric portion 422 thereof efiects longitudinal movement of slide 42! to position slot 421 in accurate vertical alignment with nose 428 (Figs. 1, 4 and of latch arm 429. Latch arm 429 is formed as an extension \of centralizing arm 3l1 so that, upon rotation of shift gear 312, nose 428 is moved from-the position shown into engagement with slot 421. By this means plusminus gears 12, 13 are positively maintained in idle position during-a carriage shift.

Another possible source of erroneous registration during .a carriage shift lies in unintentional engagement of the continuously operated revolutions counter actuator with one of the numeral wheel gears of the revolutions counter. Such erroneous registration would occur when the carriage is moving oppositely to the direction of movement of the actuator in the active portion of the cycle. To obviate this condition, I have provided means for disabling the revolutions counter actuator when a machine operation is occurringother than an actuation of accumulator numeral wheels 2|. For this purpose, member or slides 43| (Figs. 1, 3 and 4) is pivoted on screw 423 and extends forwardly therefrom and has its forward'end slidablysupported in cross frame member H. Member 43l (Fig. 1) is provided with vertical extension 432 which, with gears I2, 13 in their neutral position, is positioned beneath lateral projection 433 on spool III of the revolutions counter actuator. Because of the resilient actuation of the revolutions counter actuator in a clockwise direction, extension 432 prevents the rotary oscillation thereof which is ordinarily effectiveto move the actuator into operative position. It is to be noted that latch slide 42l and arm 429 also serve to latch member 43l in position to disable the revolutions counter actuator during shifting of the carriage. Thus, an erroneous registrationcannot occur in the revolutions counter during carriage shifting or any other machine operation not involving operation of the plus-minus gears I2, 13. Also, the revolutions counter actuator is maintained in disabled condition whenever plus-minus slide 234 is in inactive position and is enabled by movement of slide 234 resulting from manipulation of an operation control member such as keys 28-0, 20!, or automatically during a division operation.

From the foregoing description, it is seen that I have provided an improved machine in which a simple and eflicient carriage shift mechanism is provided. In connection with the carriage shifting mechanism, I have also provided safety devices which prevent possible jamming of the machine or possible erroneous registration be cause of the operation of the shifting mechanism from the accumulator actuating means.

I, therefore, claim as my invention:

1. In a calculating machine having a frame, a register shiftable with respect to said frame, an actuator for said register mounted in said frame, cyclically operable driving means having constant operative connection with said actuator, means for shifting said register by cyclic operation of said driving means, means for rendering said actuator ineffective during shifting of said register, and means controlled by said shifting means for latching said last-named means inactive position.

2. In a calculating machine having a shiftable accumulator, actuating means therefor, shifting means driven by an element of said actuating means for effecting relative shifting movement between .said accumulator and said actuating means therefor, a revolutions counter, and an actuator for said counter having a'constant drive connection with said actuating means; means for controlling a plural order operation of said shifting means, comprising means for determining operation of said shifting means with said actuating means in motion but ineffective to enter values in said accumulator, and means for rendering said counter actuator ineffective with respect to said counter during operation of said shifting means.

3. In a calculating machine having a shiftable accumulator, actuating means associated with said accumulator for selective operative connection thereto, means for shifting said accumulator relative to said actuating means, a revolutions counter, an actuator associated with said counter for selective operative connection thereto, and common drive means for said accumulator actuating means and saidcounter actuator, said drive means being connected thereto to provide invariable simultaneous operation of said accumulator actuating means and said counter actuator; means for controlling a plural order operation of said shifting means, comprising means for operating said shifting means by said drive means, whereby both said accumulator actuating means and said counter actuator are driven during operation of said shifting means, and means associated with said shifting means for rendering said accumulator actuating means and said counter actuator ineffective during operation of said shifting means without interrupting the drive therefor,

4. In a calculating machine, an accumulator comprising a series of numeral wheels, a gear carried by each numeral wheel; a pair of gears associated with each said numeral wheel gear and movable from an inactive position to mesh either gear of said pair with the associated numeral Wheel gear; a bail associated with said pairs of gears for controlling simultaneously the adjustment thereof to and from their active and inactive positions, means associated with said pairs of gears for transmitting selected increments of movement thereto; a revolutions counter, an actuator associated with said counter for selective operative connection thereto, cyclically operable common drive means for said increment transmitting means and said actuator to provide for invariable simultaneous operation thereof whenever said drive means operates; means for simultaneously effecting ordinal shifting movement between said accumulator and said pairs of gears and between said counter and said actuator, said shifting means being driven by said common drive means; and means associated with said shifting means for rendering said pairs of gears and said actuator ineffective during operation of said shifting means.

5. In a calculating machine, an accumulator comprising a series of numeral wheels, a gear carried by each numeral wheel; a pair of gears associated with each said numeral wheel gear and movable from an inactive position to mesh either gear of said pair with the associated numeral wheel gear; a bail associated with said pairs of gears for controlling simultaneously the adjustment thereof to and from their active and inactive positions, means associated with said pairs of gears for transmitting selected increments of movement thereto; a revolutions counter, an actuator associated with said counter for selective operative connection thereto; resilient means for urging said actuator to active position with respect to said counter, cyclically operable common drive means for said increment transmitting means and said actuator to provide for invariable simultaneous operation thereof; means for positioning said bail to adjust said pairs of gears to inactive position, and blocking means associated with said bail and positioned thereby with said gears in inactive position to prevent movement of said actuator to active position under the urgency of said resilient means.

6. In a calculating machine, an accumulator comprising a series of numeral wheels, a gear carried by each numeral wheel; a pair of gears associated with each said numeral wheel gear and movable from an inactive position to mesh either gear of said pair with the associated numeral wheel gears; a bail associated with said pairs of gears for controlling simultaneously the adjustment thereof to and from their active and inactive positions, means associated with said pairs of gears for transmitting selected increments of movement thereto; a revolutions counter, an actuator associated with said counter for selective operative connection thereto, cyclically operable common drive means for said increment transmitting means and said actuator to provide for invariable simultaneous operation thereof whenever said drive means operates; means for performing a non-value-entering machine operation with said pairs of gears inactive and with said common drive means active, and means associated with said operation performing means for rendering said actuator ineffective during said machine operation.

7. In a calculating machine, an accumulator comprising a, series of numeral wheels; a gear carried by each numeral wheel; a pair of gears associated with each said numeral wheel gear and movable from an inactive position to mesh either gear of said pair with the associated numeral wheel gear; a bail associated with said pairs of gears for controlling simultaneously the adjustment thereof to and from their active and inactive positions, means associated with said pairs of gears for transmitting selected increments of movement thereto; a, revolutions counter, an actuator associated with said counter for selective operative connection thereto, resilient means for urging said actuator to active position with respect to said counter, cyclically operable common drive means for said increment transmitting means and said actuator to provide for invariable simultaneous operation thereof; means for performing a non-value-entering machine operation With said pairs of gears inactive and with said common drive means active, and blocking means associated with said bail and positioned thereby with said gears in inactive position to prevent movement of said actuator to active position under the urgency of said resilient means.

8. In a calculating machine, a shiftable carriage, a register in said carriage, cyclically operable actuating means for said register, a source of power, a cyclic clutch between said actuating means and said source of power and providing the only path of power flow therefrom, driven means having a normally disabled drive connection with said actuating means, anelement on said carriage for receiving a drive from said driven means, and means including a manually operable key for enabling said connection and engaging said clutch to transmit a drive to said part by driving of said actuating means but with said actuating means ineffective with respect to said register.

9. In a calculating machine, a shiftable carriage, a register in said carriage, cyclically operable actuating means for said register including a shaft, means including a clutch for driving said shaft, driven means, an element on said carriage for receiving a drive from said driven means, normally disabled drive means between said shaft and said driven means, and means including a manually operable key for engaging said clutch and enabling said drive means to transmit a drive to said part by driving of said actuating means but with said actuating means ineffective with respect to said register,

10. In a calculating machine, a shiftable carriage, a register in said carriage, cyclically operable actuating means for said-register including a pair of parallel shafts connected for simultaneous movement said actuating means being normally ineffective to enter values in said register, means including a clutch for driving said shafts, a rack on said carriage, a reversible shift gear cooperatively related to said rack, normally disabled drive means between each of said shafts and said gear, one of said drive means operating to rotate said gear in one direction and the other serving to rotate said gear in the other direction, and means including a plurality of manually operable shift keys for engaging said clutch and means movable from a neutral position for controlling positive and negative registration on said accumulator by said actuating means, a revolutions counter, an actuator for said counterincluding a counting element and a series of transfer elements cooperatively related thereto for simultaneous movement therewith, a constantly operative drive connection from said actuating means to said actuator, and means controlled by said shiftable means and active in. said neutral position to disable said counting and transfer elements.

12. In a calculating machine having an accumulator and actuating means therefor, shiftable means movable from a neutral position for controlling positive and negative registration on said accumulator by said actuating means, a revolutions counter, an actuator for said counter having a drive connection with said actuating means for simultaneous operation therewith, yieldable means for operating said actuator, and means controlled by said shiftable means and active in said neutral position to prevent registering operation of said actuator by causing yielding of said yieldable means.

13. In a calculating machine having a shift-- able carriage, a register in said carriage, actuating means for said register, said actuator means being normally ineffective to enter values in said register, means for performing a machine opera tion including an element on said carriage for receiving a drive, and a source of power; the combination with a cyclically operable clutch providing the sole path of power flow from said source of power, of a'plurality of manually oper-able control keys for controlling cyclic operation of said clutch, means controlled by certain of said keys for causing registration on said register by operation of said actuating means, and means controlled by others of said keys for causmulatol, actuating means therefor, and means including a cyclic clutch for driving said actuating means, shiftable means for effecting positive and negative registration on said accumulator by said actuating means, a revolutions counter, an actuator for said counter having a constantly operative drive connection with said clutch to receive an invariable cyclic movement therefrom, and means controlled by said shiftable means for rendering said actuator ineffective irrespective of continued movement thereof during operative driving movement of said clutch. I

16. In a calculating machine, a shiftable carriage, a register in said carriage, cyclically operable actuatingmeans for said register, a source of power, a cyclic clutch between said actuating means and said source of power and providing the only path of power flow therefrom, carriage shift means for shifting said carriage in either direction, selectively settable means for driving said shift mechanism by said actuating means 'with said actuating means ineffective to enter values in said register, and means including a pair of manually operable shift keys for engaging said clutch and for selectively setting said settable means.

1'7. In a calculating machine having numeral effecting means, and means controlled by said ing operation of said machine operation performing means, said lastnamed controlled means including a normally disabled drive connection between said actuating means and said performing means for transmitting a drive to said element.

14. In a calculating machine having a shiftable carriage, a register in said carriage, actuating means for said register, said actuating means being normally ineffective to enter values in said register, shift means for said carriage having a drive connection with said actuating means, and

, a source of power; the combination with a cyclically operable clutch between said actuating means and said source of power providing the sole path of power flow therefrom, of means including a plurality of manually operable control ment thereof, a pair of selectively operable manipulable control members for engaging said clutch and for selectively engaging said drive connections to control the direction of movement of said drive element, and means for maintaining said actuating means ineffective to enter values in said numeral wheels during said machine operation.

. CARL M. F. FRIDEN.