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March 22, 1938. E. BREHTLING 2,11199'IE9 CASH REGI STER Filed July 6, 1935 6 Sheets-~Sheet 1 Emit Breitling His v(lttorneg March 22, 1938. E. BREITLING ‘2,111,909 CASH REGISTER Filed July 6, 1935 5 Sheets-Sheet 2 30 I5 maentcr Ernst Breitling m AMW His (Ittorneg March 22, 1938. E BREITLHNG 2,111,909 CASH REGISTER Filed July 6, 1935 7' Zmventor Ernst Breitling ' His attorney 2,111,909 Patented Mar. 22, 1938 UNITED STATES PATENT OFFIQE 2,111,909 CASH REGISTER Ernst Breitling, Berlin, Germany, assignor to The National Cash Register Company, Day ton, Ohio, a corporation of Maryland Application July 6, 1935, Serial No. 30,126 In Germany July 12, 1934 10 Claims, (C1. 235—-8) his invention relates to cash registers and the like but is more particularly directed to re peat mechanisms for such machines. It is broadly an object of this invention. to de 5 vise a. unique repeat mechanism. for cash re€~ isters and like machine-s. A more speci?c object is. to: contrive means whereby the amount of the immediately preced ing operation may be repeated without setting 10 up a condition to effect said repeating during said preceding operation. Another object is to provide means under con trol of a manipulative device to lock the amount differential members in the positions to winch ' they were adjusted in the preceding operation in order to repeat the amount of said preceding op eration. Still another object is to provide an interlock ing mechanism between the repeat starting bar and the amount keys to prevent the depression of both in the same operation. A further object is to contrive means to pre vent depression of the repeat starting bar when the total control lever is out of adding position, said means also adapted to lock the total con trol lever in adding position upon depression of the repeat bar. With these and, incidental objects in view, the invention includes certain novel features of con struction and combination oi‘ parts. the essential elements of which are set forth in the appended claims and a preferred form or embodiment of which is hereinafter described with reference to the drawings which accompany and form a part of this speci?cation. In the drawings: Fig. 1 is. a cross-sectional view taken just to the right of one of the‘ amount banks and de picts said amount bank and its associated dif ferential mechanism. Li. Fig. 1A. a detail view showing the connec tions between the totalizer element and the main differential member. Fig. 2 is a sectional view as observed from the right of the machine, illustrating the repeat starting ‘ear and associated mechanism that locks the amount differentials during repeat opera tions. Fig. 3 is a detail View of the total control lever r locking mechanism associated therewith. Fig. ll is. a longitudinal sectional view as ob served irom the rear of the machine, taken along 5 line IZ-z'i Fig. l. 5 is a detail View of the combined total and repeat control lever for a modi?ed form of repeat mechanism. Fig. 6 is a sectional View as observed from the rear of the machine taken along line 0-6 Fig. 5. 5 GENERAL DESCRIPTION The differential mechanism for each amount bank of the machine embodying the instant in vention comprises comp-anion scissors-like mem bers with a complementary movement. In add 1O ing operations these members position their as sociated indicator and type wheel differential ac tuators and the wheels of the selected tctalizer commensurate with the value of the depressed amount keys and said actuators in turn position 15 their corresponding indicating mechanism. and printing wheels commensurate with the value of the depressed amount keys. In this type of differential mechanism the actuators are not re turned to a neutral or Zero position at the end of machine operation but remain in the positions in which they were set by the companion mem bers during the machine operation. Consequent ly in the succeeding operation the actuators are moved from the positions in which they were set during the preceding operation directly to their new positions. In totalizing operations the cor responding wheels of the selected totalizer po sition the scissors-like companion members com mensurate with the amount on said totalizer ‘ wheels and said companion levers in turn posi tion the actuators and the actuators in turn po sition the indicators and the type Wheels com mensurate with the amounts on the Wheels of the totalizer. For a full disclosure of the differential mech anism outlined above reference may be hadto Letters Patent of the United States No. 1,792,569 and No. 1,899,455, issued respectively February 17, 1931 and February 28, 1933, to Ernst Breit ling. If it is desired to repeat the immediately pre ceding operation, the operator depresses the re peat starting bar, or in the modi?ed form moves the total-control lever to repeat position. This. 45 actuates. mechanism that locks the indication and type wheel differential actuators for‘ the amount banks in the positions in which they were set in the preceding operation. The actuators then position the companion levers to repeat the amount of the preceding operation. With this. type of repeat mechanism an amount may be repeatedly added in one or more totalizers and amounts may be transferred from one total izer to one or more of the remaining totalizers 2 2,111,909 by reading or resetting the ?rst-mentioned to talizer and by adding this amount in the desire totalizers in. subsequent repeat operation. In many of the i. all known machines of this type it is necessary that the operator have knowledge of a succeed’ng repeat operation in order to set up condition in the present operation to effect said repeat oper tion. However, in the machine embodying this invention no knowledge is neces 10 sary on the of the operator of a subsequent repeat it is desired operation, to repeat as all anthat operation is necessary is to manipu in late the repeat control mecharnsm. In the following pages mechanism pertinent to 15 the present invention will be described in detail. DETAILED DESCRIPTION amount key. 'l‘ne differential positioning of the plate 59 by 6|, which in turn sets an indicator for that Most of the mechanism of this machine is con tained between and supported by a right side frame 3!) and a left side frame 3! (Fig. 4) se cured to a machine base (not shown). The en tire machine is enclosed in a suitable cabinet 25 (not shown) which is in turn secured to the machine base. 20 Amount keys and their associated differential mechanism The instant machine has a plurality of de 30 nominational amount banks 32 (Figs. 1 and 4) supported by a rod 33 and a bar 34 extending be tween the frames as and 3!. Inasmuch as these amount banks and their associated differential 35 mechanisms are exactly alike, it is believed suffi cient to describe one such amount bank and its associated differential mechanism. Depressing one of the amount keys 35 moves the lower end of the stem thereof in the path of 40 a plate 37 secured to a main differential lever 33 and also moves said stem in the path of a nose 39 of an auxiliary differential lever 40, both of said levers being pivotally supported on a shaft 4| journaled in the frames 35 and 3!. The seg mental lower end of the main lever 33 (Figs. 1 and 4) has therein teeth which mesh with a sec tor 42 secured to a differential sun wheel 43 turn ably mounted. on a shaft 44 opposite ends of which are journaled in the frames 30 and 3 l. The aux iliary differential lever 40 has a segmental ex tension with gear teeth which mesh with a sec tor 45 loose on the shaft 44 and forming a sup port for a planet wheel 46 which connects the sun wheel 53 to similar sun wheel 4'5, secured to the shaft 44. Depressing an amount key 35 causes a stud 133 thereon, in cooperation with. an angular slot in a control plate 49, pivotally connected b sym metrical links 58 and 5! to the key Fame 32, to 60 impart clockwise rocking movement to said con trol plate ‘is. Clockwise movement of the con trol plate 45 causes the link Si in cooperation with a bent-over ear 52 of a zero stop pawl 53 stop pawl clockwise about its pivot 54 and against the tension of a spring 55. Clock“ wise movement of the pawl 53 moves a hook 55 thereof out of the path of an extension of is a main di?erential lever 38. differential plate as ioose on "he shaft 11!, and 10 moves said plate in unison therewith until the tud 51 is held in the tong~like embrace of the levers 38 and 413, and positioned thereby coin mensurate with the vaiuc of the depressed means of a pinion 6%} is transmitted to a gear Framework to rock toward each other in scissors fashion until the progress of one of said lovers is interrupted by engagement thereof with the stem of the de pressed amount key. The differential lever that is not restrained continues its movement until it also engages the stern of the depressed key. As the differential levers 38 and 45] move together in the manner explained above one of said levers engages a stud in a type wheel and indicator 7 During each machine operation the 9 it (it rocked ?rst counterclockwise, as viewed in Fig. 1, and then back to normal position. This “to and ovement of the shaft £4, by means Ui the sun wheel ii”! in cooperation with the planet 1; and the sun wheel 43, causes the companion differential levers 38 and lid move particular bank comrnensui ..e . a the value of the depressed amount key. Differential po 20 sitioning of the plate 59 is transmittc ‘, by means of teeth thereon in cool ation with a worm wheel 62 secured on a shart 63 journaled in a cross frame 64, to the type carrier for that par ticular bank. The corresponding wheel 94 (Fig. 25 1A) of the selected tOvllZ'Bl‘ is rocked into on gagement with a gear Q5 operatively connected to the main diiierential lever by gears 96, 9?, and 42, after said lever has con positioned by the depressed amount key, nd return move 30 ment of said lever adds an amount on the total izer wheel corresponding pressed amount key. the value of the de Immediately after the di?erential levers 38 and 40 have completed pos t‘ 53 in the manner explains the succeeding machine operation. I fore obvious that the plate 59 and its associated indicator and type wheel ain in their set 1304 sitions at the end of machine operations. In total taking operations the me’ lever 38 in cooperation w 40 positions the plate 5!! in accorda amount on the wheel of the ' This is accomplished during the ini . al. movement of said levers 3S and 40. Repeat mechanism The amount of the preceding operation, whether the result of an adding or a total taking operation, may be repeated in succeeding ma chine operations by means oi a manipulative de vice that locks the plate in its pro-set position and thus the stud 5‘! controls the p, tioning of the differential levers 38 and 45 exactly as they were controlled during the precerl'tg operation by the depressed. amount key. It obviously unnecessary as well as u desirable to depress amount keys in repeat opera .ons and to prevent this an interlocking device rendered effective by the repeat manipulative member locks the amount keys against dQI'Ll'l'ioslOl'i during repeat operations. In its pref ‘Fred form the present machine is provided with two starting bars (Fig. 52), regu lar starting bar and a repeat starting bar 66. The regular starting bar 65 is used to release the machine for o‘ ation in all operations e2; cept repeat operat. ns. Depressing the repeat bar 86 by means of a stud therein, in cooperation with an angular slot 68 in a control plate imparts counter 3 2,111,909 ' clockwise movement to said control plate. The plate 69 is rockably mounted on a frame ‘ID, that supports the starting bars 65 and 66, by means of a lever 1| pivoted at 12 to the frame 10 and a link 13. counterclockwise movement of the plate 69 and incidental similar movement of the lever l| moves a rearward extension of said lever away from a stud 14 secured in one arm of a bell crank 15 fast on a sleeve 16 loose on a rod 10 11 supported by the frames 30 and 3|. Also secured on the sleeve 16 is an arm ‘I8 connected by a rigid bar 19 to a similar arm 80 ing bar 19 out of engagement with the teeth in the di?erential plate 59. Return movement clockwise of the plate 69 by means of the pitman 8| and the bell crank 811 (Figs. 1 and 2) returns the rod 88 also clockwise to permit the zero stop pawl 53 to be returned counterclockwise to effec tive position by the spring 55. It is obvious from the foregoing description that by simply depressing the repeat starting bar 5% the amount of the preceding operation may be 10 repeated for the purpose of entering said amount in one or more of the machine totalizers. (Fig. 1i) rotatably supported by the rod ‘ll. Counterclockwise movement of the lever '|| per mits a spring 8|, the upper end of which is connected to the arm 18, to rock the rigid trans verse bar 19 into engagement with a tooth space in the top edge of the plate 59. This locks the plate 59 in the position in which it was set dur Interlock between the amount keys and the repeat starting bar Depressing one of the amount keys 35 (Fig. 1) actuates interlocking mechanism that prevents depression of the repeat starting bar 56 (Fig. 2) ing the preceding machine operation. In adding operations, depressing an amount key rocks the zero stop pawl 53 (Fig. 1) out of the path of the lever 38. However, as no amount key is depressed in repeat operations, it is neces sary to provide other means to rock the Zero stop pawl 53 to ineffective position. A pitman 8| (Fig. 2) one end of which is pivoted to the plate and likewise depressing the starting bar 66 actu ates the interlocking mechanism to prevent de pression of an amount key 35. This interlocking mechanism will now be described. Pivoted to the upper end of the control plate 49 (Fig. 1) is a pitman 38, the upper end of which is bifurcated to embrace the rod 82. The pitman 98 carries a pin E39 adapted to cooperate 69 and the other end of which is bifurcated to straddle a rod 82 extending between the frames 30 3i! and 3| moves in unison with said plate 69 upon depression of the repeat starting bar 66. Movement of the pitman 8| by means of a stud 83 therein in cooperation with the forked upper end of a bell crank 84 ‘secured to one end of a Cu CA sleeve H5 loose on a rod 85 extending between the frames 30 and 3|, imparts counterclockwise movement to said bell crank 84. The lower end of the bell crank 84 is bifurcated to embrace a stud 35 in an arm 81 loose on the sleeve H6 and 40 connected by a transverse rod 88 to a similar arm 89 (see also Fig. 4). It is therefore obvious that the arms 81 and 89 and the rod 88 move with an arm ind, ecured to a sleeve iiil, loose on a rod I82, supported by the frames 36 and 3|. Also secured to the sleeve iEi| (Fig. 2) is an arm H33, adapted to cooperate with the stud 83 in 3O the pitman 8|. Depressing one of the amount keys 35 moves the control plate 619 and the pitman 98 upwardly, causing the stud S9 to impart counterclockwise movement to the arm Hit, the sleeve it); and the " arm 583. This moves the arm 5 3 into contact with the stud 33 thereby blocking downward movement of the pitman 3i and the control bar 69 to obstruct depression of the repeat bar 59 40 when an amount key is depressed. Likewise depressing the repeat starting bar 66 moves the stud 83 into contact with the arm “33 to block counterclockwise movement of said arm and the arm iilii (Fig. l.) to prevent depression of an amount key 35 when the repeat starting 45 bar 65 is depressed. said rod, in cooperation with an angular ex Total control lever tension of the zero stop pawl 53, to rock said pawl clockwise to remove the hook 56 thereof The machine embodying the preferred form of out of the path of the differential lever 38. this invention is provided with a total control I After the zero stop pawl 53 is moved to ineffec lever we (Figs. 3 and 4) having three positions tive position the differential levers 33 and 4!! of adjustment. namely, “Add”, and “Be move towards each other in a scissors-like man set”. Interlocking mechanism between the total ner until positioned by the stud 51 in the plate control lever ltd, the repeat starti~ P bar 536 and 53 which is locked in the position in which it was the amount keys prevents depression of said : set in the preceding operation by the bar 19 repeat and said amount keys 3?: when (Fig. 2). This causes the amount of the pre the total control lever iiili is out of adding posi vious operation to be repeated. tion. Likewise the interlocking mechanism locks A cam. 90 (Figs. 2 and 4) is secured to a gear the total control iever in adding position when 60 93 loose on a rod 9| supported by the frames 33 either an amount key or the repeat GE is (30 and 3|. The gear 93 and the cam 9!! are driven depressed. Such mechanism will now be deone counterclockwise revolution each machine operation. Near the end of machine operation scribed. The total control lever Hid is rotatably sup counterclockwise in unison with the bell crank 85 when the repeat bar 65 is depressed. Counter~ clockwise movement of the rod 88 (Fig. 1) causes the periphery of the cam 90, in cooperation with a stud 32 in the bell crank 15, rocks said bell crank counterclockwise to disengage the locking bar if} from the plate 59. Also near the end of machine operation the repeat starting bar 66 is released and is springereturned upwardly to un depressed position. Return movement of the repeat bar 56 causes'the stud. 61 in cooperation with the angular slot 68 to return the plate 69 and the lever ‘H clockwise to normal position, in which position said lever l'l engages the stud H in the bell crank 15 when the lobe of the cam 9G moves beyond the stud 92, to retain the lock ported on the shaft and has a segmental por tion with teeth which mesh with a gear “35, revolvahle on. the rod 9E. The gear I85 is secured to a locking disk 535, with an arcuate locking slot 59'! which coincides with a bent-over exten sion Hit‘ of an arm 499 when the total control lever i534 addingr position, as shown in Fig. 3. The arm £535 is secured to a sleeve iii! loose on the rod 85, said sleeve having also secured thereto an arm iii (Fig. i) which extends in the path of the stud $9 in the pitman 98. Depressing an amount key 35 moves the plate . 4 2,111,909 49, the pitman 98 and the stud 99 upwardly to impart clockwise movement to the arm I I I, the sleeve I I0 and the arm I09. Clockwise movement of the arm I09 moves the extension I08 into the slot I0'I to lock the total control lever in adding position when an amount key is depressed. A spring II2 normally maintains the extension I08 out of the slot I0‘I when an amount key is not depressed and urges the arm III counterclock~ wise into contact with the stud 99. When the total control lever I04 is away from adding posi tion the slot I0‘! is out of alinement with the ex tension I 08 and the periphery of the disk I06 blocks clockwise movement of the arms I09 and 15 I I I to prevent depression of an amount key 35. The disk I06 has another arcuate slot I I3 which coincides with a bent-over projection I I4 of an arm II5 when the total control lever I04 is in adding position. The arm II 5 is secured on one 20 end of the sleeve II6 to the other end of which is secured the bifurcated bell crank 84 (Fig. 2). The sleeve I I6 is rotatably mounted on the sleeve II 0 which is turnably mounted on the rod 85. Depressing the repeat starting bar 66 imparts 26 downward movement to the control plate 69 and the pitman 8| causing the stud 83 to rock the bell crank 84, the sleeve H6 and the arm II5 (Fig. 3) counter-clockwise to move the projec tion II4 into the slot II3 to lock the total con 30 trol lever I04 in adding position when the repeat bar 66 is depressed. Moving the total control lever I04 out of adding position moves the notch II3 out of alinement with the projection II4, permitting the periphery of the disk I06 to block 35 counterclockwise movement of the arm I I5, which by means of the sleeve H6 and the bell crank 84 blocks downward movement of the pitman BI and the control bar 69 to prevent depression of the repeat release bar 66 when the total control lever I04 is out of adding position. MODIFIED FORM A modi?ed form of repeat mechanism is illus trated in Figs. 5 and 6, in which a total control lever II9, similar to the total control lever I04, has four positions—viz., “Add”, “Read”, “Reset” and “Repeat”. When the total control lever H9 is in “Repeat” position, the amount keys are locked against depression and the differential 50 control plate 59 is locked in the position to which it was adjusted in the preceding operation. De pressing the regular starting bar 51 sets the ma chine in motion to repeat the amount of the pre ceding operation. It will be understood that 55 moving either the total control lever I04 of the preferred form, or the total control lever II9 of the modi?ed form, away from adding position rocks the zero stop pawl 53 (Fig. 1) to ineffec tive position, in order that the stud 51 in the plate 60 59 may position the companion scissors levers 38 and 40 in the manner explained hereinbefore. As in the preferred form, the total control le ver I I9 has a segmental portion with teeth which mesh with a gear I20 secured to a control disk I2I rotatably supported by the rod 9|. The disk I2I (Fig. 5) has in the left face thereof a cam ming groove I22 into which extends a stud I 23 carried by an arm I24 secured to the righthand end of a sleeve I25 revolvable on the rod 11. 70 Secured to the left end of the sleeve I25 is an arm I26 which supports one end of a transverse look ing bar I21, the other end of which is supported by an arm (not shown) similar to the arm I26, and loose on the rod 11. The arm I26 and the locking bar I21 are similar to the arm ‘I8 and the locking bar "I9 (Fig. 2) of the preferred form, and the locking bar I21 cooperates with the teeth on the upper portion of the plate 59 in exactly the same manner as the bar 19. The con?guration of the cam groove I22 is such that when the total control lever H9 is moved to “Repeat” position, clockwise movement is imparted to the arm I24, the sleeve I25, the arm I26 and the locking bar I21, to engage said locking bar with the teeth of the differential 10 plate 59 to lock said plate in the position to which it was set in the preceding operation. Releasing the machine for operation by means of the starting bar 65 causes the amount of the pre ceding operation to be repeated in the manner 15 explained above. It will be noted that when the total control lever H9 is in “Add”, “Read”, or “Reset” position the cam groove I22 maintains the locking bar I21 out of engagement with the plate 59. 20 The disk I2I has an arcuate slot I28 which is alined with the extension I08 of the arm I09 when the total control lever I I9 is in adding posh tion. Depressing an amount key 35 (Figs. 1 and 5) through the plate 49, pitman 98 and Stud 99 25 rocks the arm III, sleeve H0 and arm I09 clock wise to engage the extension I08 with the slot I28 to lock the lever H9 in adding position. Mov ing the lever Il9 away from adding position ro tates the disk I2I clockwise to move the slot I28 30 out of alinement with the extension I08 and the periphery of the disk I2I obstructs clockwise movement of the arm I09 to prevent the depres sion of an amount key 35. While the form of mechanism herein shown 35 and described is admirably adapted to ful?ll the .objects primarily stated, it is to be understood that it is not intended to con?ne the invention to the one form or embodiment herein disclosed, for it is susceptible of embodiment in various 40 forms, all coming within the scope of the claims which follow. What is claimed is: 1. In a machine of the class described, hav ing a plurality of amount keys, the combination 45 of amount differential means, including compan ion members with complementary movement, said companion members adapted to be posi tioned for adding and total taking operations; a member arranged to be positioned by the com- panion members in adding and total taking op erations, and adapted to control the positioning of the companion members in repeat operations; means to lock the member in set position; a manipulative device; and means operated by the - manipulative device to render the locking means effective to lock the member in set position to cause said member to position the companion members to repeat the amount of the preceding operation. 2. In a machine of the class described, having a plurality of amount keys, the combination of companion levers with a complementary scissors movement adapted to embrace the stem of a depressed amount key to be positioned com- " mensurate with said amount key for adding amounts; a member arranged to be set by the companion levers at the time said companion levers are positioned by the depressed amount key, said member adapted to remain in set po sition until the succeeding operation; teeth on the member; an element cooperating with the teeth to lock the member in set position; a manipulative device; and means operated by the manipulative device to render the locking means 5 2,111,909 effective to cause the amount of the preceding operation to be repeated in the succeeding opera tion. 3. In a machine of the character described, the machine for a repeat operation; a rockable the combination of companion levers with a com plementary scissors movement; a member adapt ed to be positioned by the companion levers in adding and total taking operations, and adapted to control the position of said companion levers 10 in repeat operations, said member adapted to remain in set position until the succeeding op eration; means to lock the member in set po sition; a manipulative device; and means where by the manipulative device renders the locking 15 means effective for the succeeding operation to retain the differential member in the position in which it was set in the preceding operation to position the companion levers commensurate therewith. 4. In a machine of the character described, capable of adding, totalizing and repeat opera tions, the combination of a settable differential member; means including two companion levers with complementary scissors movement to set 25 the differential member in adding and total tak ing operations,‘ said companion levers adapted to be positioned under control of the member in repeat operations; and means effective in repeat operations to retain the differential member in 30 the position in which it was set by the compan ion levers in the preceding operation to cause said differential member to control the position of the companion levers commensurate there with. 5. In a machine of the class described, capable 35 of adding, totalizing and repeat operations, the combination of means to initiate repeat opera tions; a settable differential member arranged to remain in set position until the succeeding op 4.0 eration; companion levers with complementary scissors movement, said. companion levers set ting the differential member in adding and total taking operations and positioned under control of said differential member in repeat operations; normally ineifective means to lock the diifer~ ential member in set position; and means in cluding a rockable element associated with the initiating means to render the locking means effective to cause the differential member to con 50 trol the position of the companion levers com mensurate therewith. 6. In a machine of the class described, capable of repeat operations, having a plurality of amount keys, the combination of a settable differential member adapted to remain in set position until the succeeding operation; means including com panion levers to engage a depressed amount key and set the differential member accordingly, said companion levers positioned under control of the differential member in repeat operations; means effective in repeat operations to retain the differential member in the position in which it was set in the preceding operation by the companion members and the depressed amount 65 key; a manipulative device; and means positioned by the manipulative device to render the retain ing means effective. 7. In a machine of the character described, the combination of a differential member adapted 70 to be set during a machine operation and remain set until the succeeding operation; means to lock the differential member against any movement when it is in set position; means to condition element actuated by the conditioning means; and a part operatively connecting the element to the locking means to cause the conditioning means to render the locking means effective to lock the differential member in the position in which it was set in the preceding operation to retain the setting of said differential member in the succeeding operation. 8. In a machine of the class described, the 10 combination of a rotatable differential member adapted to be set during a machine operation and remain set until the succeeding operation; means to rotate the differential member; means to lock the differential member against rotation 15 from its set position; a manipulative device; a cam operated by the manipulative device; an element intermediate the cam and the locking means to cause movement of the manipulative device to a certain position to‘ render the locking means effective to lock the differential member in the position in which it was rotated to the preceding operation to retain the setting of said di?erential member in the succeeding operation. 9. In a machine of the class described, hav ing a plurality of amount keys, the combination of a differential member adapted to be posi tioned during a machine operation and to remain so positioned until the succeeding operation; means to position the differential member com mensurate with a depressed amount key; means 30 rendered effective prior to the succeeding opera tion to lock the differential member in set posi tion to retain the positioning of said differential member during the succeeding operation; a manipulative device; means connecting the manipulative device to the locking means to cause movement of said manipulative device to render the locking means effective; a control member movable to a plurality of positions; a disk op 40 eratively connected to the control member and having therein two notches; an element actuat ed by the connecting means and adapted to enter one of the notches upon movement of the ma nipulative device to lock the control members in 453 a particular position; and a piece arranged to enter the other notch in the disk upon depres sion of an amount key to lock the control mem ber in said particular position, said disk in coop eration with the element and the piece, adapted 5"? to prevent movement of the manipulative device and the depression of an amount key when the control member is out of said particular posi tion. 10. In a machine of the class described, the 557-‘ combination of a manipulative device to control repeat operations of the machine; complementary movable differential members; an element ad justable differentially by the complementary movable differential members according to the differential adjustment thereof; locking means for the element, normally in unlocking position; and connections between the manipulative device and the element to move the locking means into locking position upon operation of the manipu lative device to lock the element in the posi tion to which it was adjusted in the preceding operation, whereby the element controls the po sitioning of the differential members during the operation in which the manipulative device is operated to repeat the amount of the preceding operation. ERNST BREI'I'LING. 4 CERTIFICATE OF CORRECTION. Patent No. 2,111,909. March 22;’ 19580 ERNST BREITLING. ' It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 5, second column, line 22, claim 8, for the _word "in" second occurrence, read to; same line and claim, for "toH read in; and that the said Letters Patent should be readwith these corrections therein that the same may conform to the record of ‘the case in the Patent Office, Signed and sealed this 5d day of May, Aa DB 1958. (Seal) Henry Van Arsdale, Acting ‘Commissioner of Patents. .- CERTIFICATE OF CORRECTION. Patent No. 2,111,909. ' ' 7 March 22, 1958. ERNST BREITLING. ' It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 5, second column, line 22, claim 8, forv the ‘word "in" second occurrence, read to; same line and claim, for "to" read in; and that the said Letters Patent should be readwith these corrections therein that the same may conform to the record of the case in the Patent Office; Q Signed and sealed this 5d day of May, A. D. 1958. Henry Van Arsdale, (Seal) ' ‘Acting Commissioner of Patents.