US2546884A - Function control - Google Patents

Description

March 27, 1951 E. F. BRITTEN, JR

FUNCTION CONTROL MECHANISM 9 Sheets-Sheet 1 Filed July 13, 1945 mmumnmmarm March 27, 1951 E. F. BRITTEN, JR

FUNCTION CONTROL MECHANISM Filed July 1:5, 1945 9 Sheets-Sheet 2 INVENTOR fcw'? I? EB/wzfen, l.7,2,

March 27, 1951 E. F. BRITTEN, JR

FUNCTION CONTROL MEOHANISM Filed July l5, 1945 m: INVENTOR ni Z" fer-1 MTORNEY v la. khl

March 27, 1951 E. F. BRITTEN, JR

FONCTION CONTROL NEOHANISM Filed July 13. 1945 March 27, 1951 E. F. BRITTEN, JR 2,546,884

FUNCTION CONTROL MECHANISM Filed July 15, 1945 9 Sheets-Sheet 5 Q QQ WW f'wfl ZEh'zNzXSTF,

` A TORNEY 9 Sheets-Sheet 6 March 27, 1951 E F BRITTEN JR Y FUNCTION CONTROL MECHANISM Flled July l5 1945 March 27, 1951 E. F. BRITTEN, JR 2,545,884

FUNCTION CONTROL MECHANISM Filed July 15, 1945 9 Sheets-Sheet '7 Eau/512 Fffiien A771,

March 27, 1951 E. F. BRITTEN, JR

FUNCTION CONTROL MECHANISM 9 Sheets-Sheet 8 Filed July 13, 1945 Ea wan E. F. BRITTEN, JR

FUNCTION CONTROL MECHANISM March 27, 1951 9 Sheets-Sheet 9 lNvENTOR Eguyin FB ffixmJ/v, I/

MMORNEY Filed July l5, 1945 Patented Mar. 27, 1951 UNITED STATES TENT FFICE FUNc'rioN coNTRoL Meenemen/r Edwin F. Britten, Jr., Short `llills, N. J., assigner to Monroe Calculating AMachine Gom-pany, Orange, N. J., a corporation 4of vDelaiifare Application July 13, 194.5, Serial o. 604,851

y 6 Claims. 1

invention has relation to calculating 'maf chinos, and more particularly 'to means for controlling the various Voperations thereof, and 'it consists in the novel construction and vcombination 'of parts as set forth in the appended claims.

For subject matter originally disclosed and claimed in this application, reference is 'made to my co'pending application, Serial No. 711,253, Which was filed on November 21, 1946, and is a ldivision of this application (now Pat. No. 2,538,- 896 issued January 23, 1951).

According to the invention, various 'operations ofthe machine, such as registration, shifting or the register carriage, etc., 'are controiled by a common mechanism providing for the starting, duration and stopping of the 'operation and for movement 'of the parts selectively in Aone or in another direction.

Preferably, the 'operation 'oidivis'ion 'is eiTected automatically according to theniethod wherein 'the divisor is subtracted from thedividend until 'the `registration becomes negative; `the register carriage is shifted; the vdivisor is Yadded luntil the 'registration becomes positive; theregister carriage is again shifted, etc., this methodoi operation being known, and described, or instance, in United States Patent lo. 1,"?'7 3,027 issued lon August 12, 1936 to George 4C. Chase.

In Vthe accompanying drawings, illustrating Athe invention:

Fig. l is alplan View of a calculating linachine embodying the invention.

FigfZ is a `right side elevationof the machine With the casing and other Yparts removed.

vFig. 3 -is a section taken on line -Bof 1Fig. 8.

Figs. 4 and 5 are detail views of the program latch and escapement mechanism.

Fig. 6 is -a section taken on line 6 6 of lig. 8.

Fig. 7 is a detail View of a stop tripping means.

Fig. 8 is a rear elevation of the machine with 'the vcasing removed and 'the register carriage partly broken away.

Fig. 9 is a left side elevation of the machine with the A-casing removed.

Fig. '10 is a section taken on line -I l of Fig. '8.

Fig. V11 is a section taken on line lE-H of Fig. 8.

Fig. 12 is a detail view of the carriage shitting clutch and Worm.

Fig. 13 is a detail view of the Ymultiplierquotient register reversing means.

Fig. 14 is `a right side elevation of the machine With casing removed, showing parts omitted from Fig. 2.

Fig. 15 Vis a detail View 'of 'the lkeyboard clearing key and associated parts. y

1'6 is a fragmentary right side elevation of the machine, with casing removed, showing .parts 'relating to the control of 1ion-1'egistering operations.

Fig. 17 is an 'exploded perspective View 4of a Vplate 'and cam, fast upon the division program shaft.

Fig. '18 is ya `perspective view of a niem'ber operable during automatic division to effect forward or alternatively reverse drive.

Amounts set up on the keyboard vi8 (Figs. 1 and 3), and thereby vupon the dilerential actuatorsl 5, are registered upon the numeral -wheels `I3 of the 'produote'd-vidend register upon operation 'of the differential actuators in La forward or reverse direction by the operation of an electric motor lill?.

Registering voperation The plus Yand minus bars operate upon depression to rock a shaft i25 in a-clockwise or-counter- 'clockwise direction respectively, as viewed in Fig. 2.

'At its left hand end shaft |25 is provided With ari-arme!) (Figf) having a stud engaging a slot of link '51, said link beingconnected vat Vits rearward Vend with Aa rocker 52 (Fig. 10), movable ineither direction upon operation of shaft E25 to displace a toggle link connection 53 with a lever 5d (fulcrumed '91155) out Vof dead center relation to the shaft 83 upon which rocker 5-2 is fixed. This movement serves, vas will be seen, to set the mechanism for jfurther rotation of the `rocker in the selected direction, to engage the main :clutch for additive or subtractive operation respectively. Also, the preliminary ymovement oi rocker 52 ser-ves to 4engage an auxiliary clutch and Vto close va switch in the motor circuit.

1liforthis purpose an arm 5E (Fig. 9), xed upon shaft '38, is rotated bythe rocker out of supporting engagement with a clutch detent AEil, said detentrnorrnally acting to hold a cyclically driven clutch 58 in disengaged condition. Clutch 58 has gear connection Iwith the motor shaft I0! and is 3 of a well known type, wherein a pawl in the driven element of the clutch is spring urged toward a ratchet on the driving element, the clutch being disengaged by contact of said pawl with any detent or stop supported in the framing of the machine.

Upon release of clutch 58 by detent 5l a spring impelled arm 55? (Figs. 2 and le) will operate to rotate a cam fast upon the shaft Si to which the driven element of clutch t is secured, thus rotating shaft Si and a notched disk E2 fast thereon (Fig. 3). An intermediately fulcrurned lever 63 has a roller normally engaging the notched disk E2 and having at its lower end a roller of insulating material engaging a spring leaf of switch 64, interposed in the motor circuit. Rotation of shaft 6| ywill iorce the roller of lever 63 onto the periphery of disk 62, whereby switch E4 will be held closed.

When the anti-friction roller of arm 5.9i drops to the low point of cam Eil, a forward extension of said arin will displace an arm lil, fast upon a shait l5. A slotted arm "a6 (Fig. 6), also fast on shaft l5, has pin slot connection with the link Eil, so that as shaft l5 is rocked, link 5| will be lifted free ci the stud of arm 5t of shaft |25, i'reeing rocker 5l (Fig. l0) of the main clutch from said shaft.

Upon the initial movement of clutch 58 a cam 66, fast on shaft (il, will be brought into contact with an anti-irictionroller of lever 5E., and durn ing the remaining portion of the rst half cycle of movement of said clutch cam E@ willr move rocker 52 further in the selected direction.

Fast to rocker 52 is a member 6l (best seen in Fig. 9) provided lwith oppositely disposed hook projections. This further movement of rocker 52, following depression of the plus bar, will bring one of the projections of member into contact with a lug formed on a friction band t8 (Fig. lil), closing said band about the periphery or the internally toothed gear It of the main clutch. This main clutch comprises a diferential gear clutching and direction controlling mechanism constructed in accordance with the disclosure of United States Patent No. 1,566,550, holding of the gear i G5 of the differential causing the planet gear assembly to rotate about motor shaft lill, thereby rotating a train of gearing connecting with the shaft 4 of the differential actuators E, as .seen in Figs. 6 and 2.

Depression of the minus bar providesfor the rocking of member 5l in the opposite direction, bringing the opposite hook thereof into engagement with the lug of a friction band l@ (Fig. 9) engaging the periphery cfa plate ll, fast with a gear HB9, loosely mounted on shaft loi and meshing with the planet gears of the differential. Holding ci gear its will result in opposite or subtractive rotation or the planet assembly and the differential .actuators 5.

Having effected the engagement of the main clutch, auxiliary clutch 58 will be released and held disengaged in mid cycle position by means of a detent i3, whereby switch @il will be held pass beyond full cycle position, arm Z4 will be' closed and rocker? held in extreme operated position, to maintain pressure upon the friction band of the main clutch. The differential actuatorsI will continue to cycle until the depressed plus or minus bar is released or until the registration the numeral wheels E3 changes from a positive to a negative character or vice versa. Thereupon, at the end of the current cycle, means will be operated for reengaging clutch 58 and for stopping and locating the differential actuators,

i this means being controlled by trigger 3| (Fig. 9)', and control devices similar to those disclosed in United States Patent No. 1,566,650.

When the plus or minus bar is depressed a plate |28 (Fig. 6) will rock, said plate being connected by a coupling pawl i2? with an arm |2, fast on shaft 25. Plate lil is provided with opposed cam surfaces engaging an anti-friction roller ist mounted upon an arm itil (Fig. 9), movement oi the plate in either direction thereby serving to depress the rearward end of arm |3t. A spring pawl 53% is mounted on the rearward end of arm |313 and is normally held tensioned by engagement thereof with a lug of trigger 3|. Upon movement of arm ist, pawl itt is moved away from the trigger 3l and will be rotated by its spring into position underlying the lug of said trigger.

A quick stroke latch |58 is moved by a spring 35 into position beneath the forward extension of arm i313, holding said arm in rocked position until a cycle of the diierential actuators has been started. A rock arm 2'2", pivoted upon the framing at Z3, is provided with a link 2|, the other end of which has driving crank connection with a shaft |54, driven in one-to-one ratio with the differential actuator shait. During the first registering cycle rock arm 22 will be brought into contact with quick stroke latch |58, disengaging it from arm les and bringing it into camming engagement with an arm |59, pivoted upon arm i3d and connected therewith by a strong spring |57. This will place arm |69 under the influence of restoring spring |67. IThe restoration of arm i3d involves the return of the plate |28 to normal centralized position, and since shaft |25 is free from the link connection 5|, the shaft and plate |28 will be centralized, upon release of the key, by one of a pair of spring arms 8| (Fig. 3). In this return of arm |34 pawl |36 will contact with the lug of trigger 3|, thereby raising said trigger out of contact with a pawl 25 carried upon a stopping arm 2d. Stopping arm 24 is pivotally mounted upon the framing at 23, and pawl 25, when released from trigger 3|, will be moved by its spring into contact with the rock arm 22. As the differential actuators are rotated to their fullcycle position, pawl 25 will fall behind a shoulder of arm 22 to couple the arms 22, 2d together for movement as a unit. As the actuators carried forwardly, acting, through link to rock the mid cycle clutch detent 'i3 out of engagement with the pawl or clutch 58. Rocking of detent 'i3 will also'bring said detent into Contact with a pivoted plate l, forcing said plate against a diskr'i', fast to shaft |95 having driving con nection with the differential actuators, whereby further rotation of the actuators in the original direction will be resisted. A leaf spring 3Q serves to hold plate 'i8 normally in light contact with cisl; is.

Should a change of sign occur in the register I3 while the plus or minus bars are held depressed, the consequent tens transfer to the extreme left hand wheels of the register, operating through a gear l2 in driving engagement with one of the numeral wheels of the register, will operate to trip the trigger 3i and effect a stop. Thecoupling pawl l2l is provided in order that trigger 3|, having been tripped by the action of the register |21, will not again be tripped, after the parts have come to rest, upon release of the depressed key. The coupling pawl is moved out 5, of coupling position by contact of a pin xed in the stopping arm 24 with an arm of said pawl.

Auxiliary clutch 58, being reengaged, will operate through its last half cycle of movement, thereby disengaging the main clutch as follows:

Cam 65 (Fig. 10), being rotated, will drop away from the anti-friction roller of lever 54, and a projection 83, fixed upon said cam, will engage the upper arm of an intermediately fulcrumed lever 81|, the lower arm of which is provided with an 'anti-friction roller engaging one of two opposed cam surfaces of the rocker 52, the roller being forced against the rocker to return it to its normal centralized position, thereby disenlgaging the hook of member 61 from the lug oi friction band 68 or 10.

The differential actuators, having been stopped beyond their full cycle position, will be returned to such position and held therein so long as the machine remains at rest. For this purpose an eccentric 85 (Fig. 9) fast with the driven member of clutch 58, engages an anti-friction roller of a pivoted plate |55, a second anti-friction roller on said plate being driven by the eccentric against a locating cam |53 fast upon the shaft |54. Cam |53 is so designed that as clutch 58 comes to its Vfull cycle position, eccentric 85, through plate |55, will rotate the cam, the differential actuator and the parts driven therewith, in either direction back to full cycle position.

Restoration of rock arm 2v2 to normal position will permit arm 2t to be restored therewith, under the influence of a spring 28, a lug of pawl 25 thereupon engaging the end of trigger 3|, whereby the pawl will be lifted free of the shoulder of rock arm 22.

Rocker 52 having been restored to normal position during the last half cycle of clutch 58, arm 56 will have relocated clutch detent 51 in the path movement of the projecting portion of the clutch pawl, so that the clutch will be disengaged as it is rotated to full cycle position. The notch of disk 62 now being in register with the antifriction roller of lever S3, the switch in the motor circuit will be open. Also, cam Si! having been vrotated to normal position, spring arm 58 will be retensioned and link 5| will be allowed to drop Ainto engagement with the stud of arm 5t.

During each cycle or registering movement of the actuators 5, a counting inger (Fig. 3) will operate one of the numeral wheels |15 of a multiplier-quotient register in known manner. The counting nger mechanism may be of any well known design, but is shown herein as conforming to 'the disclosure of United States Patent No. 2,213,237, issued to Edward C. Walter on February 1'?, 1942, and entitled Registers Non-registering operations The driving and operation controlling means hereinbefore described are employed in effecting all power operations of the machine, such as shifting of the register carriage 2, clearing the registers I3 and |1t, etc. t is, therefore, necessary to disengage the differential actuators 5 from the numeral wheels i3 during non-registering operations, and for this purpose the shaft i is mounted on a frame |11 (Fig. 2) pivoted upon the carriage vsupport rod |13 and supported at its free end upon a toggle linkage |19, normally held in dead center position by means of a spring ESS. be noted that the right hand end of shaft iiA has bearings in an extension of the frame |11, as seenin Fig. 2, whereas the left hand end ci said shaft has bearings in the main france of the malt may` chine as seen in Fig. 6, this shaft being of such length that the rocking of frame |11 about point |18 will not interfere with the rotation of the shaft or operation of the gears secured to the opposite ends thereof. The lower link of toggle |19 has a toggle link connection |8| with a pivoted arm |82, driven by a link |83 eccentrioally secured to the cam 60. The toggle links |8| are normally held in dead center position by means of a spring |84, but in the machine operations previously described, said toggle |8| is broken by means of a link |85, having pin and slot connection with one of the toggle links |8| and pivotal connection with the forward extension of arm 59. Thus, in registering operations, arm |82 is rocked forwardly, but the toggle |8| is broken, so that the spring will hold the toggle |19 in dead center position, maintaining the frame .|11 in raised position.

When non-registering operations are to be performed, a blocking pawl |86 is rotated counterclcckwise about its pivot |81, bringing said pawl beneath a lug formed on the forward end of arm 5S. This will allow a partial operation of arm 59, suiiicient to close the motor switch and uncouple the link 5|, but insunicient to break the toggle |8|, this toggle now acting as a rigid bar, under the thrust of link |83, to rock the lower link of toggle |19 about center |14, breaking the toggle 19 and rocking the frame |11 intoits lower position, wherein the gearing related te the differential actuators 5 is moved out of mesh with the gearing related to the register I3.

it will be recalled that clutch 58 is given a preliminary half cycle of operation and is then brought to rest, thus cam 60 will be held in mid operated position and toggle bar ISI will maintain frame |11 in its lower position during the operation of the main clutch. At the end of the operation clutch 58, in completing its full rotation, will act to retract toggle bar |8I, restore toggle |19, and thus raise and relatch frame |11.

Carriage shifting may be eiected automaticaly during a division or a multiplication operation, or may be effected by the depression of a right .shiftkey 2129 (Figs. 1 and 16) or of a left shift key 230, these keys operating similarly to the plus or minus bars to rock the arm |24 and shaft 125 in one or the other direction to engage the clutch and determine the direction of drive, as previously explained. Both keys have bottom cam extensions, operable to move a slide 23| toward the rear of the machine, said slide having pivotal connection with a lever 232, which in turn has pivotal connection with the blocking pawl i235, so that as either key is depressed the pawl will be moved into position to effect dropping of the frame |11.

When carriage shifting is to be effected an intermediately pivoted lever 88 (Fig. 2) will be freed by the rocking of frame |11 from the restraint of a pin |35, iixed in said frame, allowing lever |88 and the parts connected thereto to rock, under the influence of a spring |95 (Fig. 12). Lever |83 is connected by means of a bell crank lever |$l| and link 192 with a shipper arm |93, engaging the grooves of a coupling element |94, splined to a carriage shifting shaft (see also Fig. 8), so that in the movement of frame |11 to its lower position, spring itil will move coupling clementy it@ into contact with a cooperating coupling hub of a shifting worm 186, engaged with a pinion |91 which in turn meshes with the teeth of a rack |98 fixed upon the register carriage 2. Yieldable toothed-pawls |59, at the ends of rack |98, provide for one way shifting operation when the carriage stands in either of its extreme shifted positions.

The shifting shaft E95 is driven through a pin 260 nxed in an arm fast upon the right hand end of said shaft (the left hand end of Fig. 8), pin 200 being engaged by one of the opposite faces of a plate 25E (Fig. 2) mounted upon a stud xed in an extension of the pivot-ed frame |11. v.A gear 252 is fast with plate 25|, and meshed with the driving` gearing mounted in pivote-d frame 11. It will be noted that the driving connection 255, 25! provides for lost inotion in the drive of carriage shifting shaft i535, this being provided in order that the carriage may be shifted and stopped as the shifting means cornes to full cycle position, whereas the differential actuators are allowed to run beyond full cycle position in stopping. The disk 15 (Fig. 9), described in connection with the full cycle stopping means, is mounted on the left hand lend of carriage shifting shaft 95, the spring Si! serving through plate 15 to hold the carriage shifting parts in full cycle position, as vthe actuators are returned from overrun to full cycle position.

The shaft 203 (Fig. 3) on which the counting finger Il'ii is mounted is journaled in the pivoted frame |11, but since shaft 252 receives little bodily movement when frame 11,1 is dropped, a lever 205, pivot-ed upon the frame 111, will fulcrum upon a pin 285, in the fixed framing'Y of the machine, the rear end of said lever beingy depressed when frame |11 is rocked, to hold the yieldaoly mounted counting finger 1.15 out of counting relation to the numeral wheels i125 during non registering operations.

The counting finger 15 is set for operation forwardly or reversely to provide for registration in the multiplier-quotient registerl 15 according to a sign like or unlike the sign or" registration inthe product-dividend register I3, by means 'of a three-positioned change lever 220 (Figs. l2 and 14) similar to that disclosed in United States Patent No. 2,260,291., issued to applicant on Gctober 28, 1941, and entitled Calculating Machines. The change lever is adapted to be set alternatively in one or the other rection from its intermediate, neutral position into likeor unlike registering position, shaft 203 being shifted accordingly toward the'right or left (Figs. 2 and 1.3), to control the direction of operation in accordance with the disclosure of Patent No. 2,273,237, hereinbei'ore referred to.Y Lever 22d is returned from either active position to intermediate or neutral position upon operation of the keyboard clearing means, a lever 22! (Fig. le) being provided for this purpose. Lever 224 is fulcrumed upon the framing at 222, and is formed with cam jews on its rearward end, adapted to ce brought into engagement with a stud 22S of lever The forward end 0f lever 2?;l has pin and slot connection with an arm 2 il, upon keyboard clearing shaft 2M, shown in Patent No. 1,750,565, issued to E. F. Britten, Jr., on llflarch il. 153". Shaft 2li may be rocked. directly by the keyboard clearing key as in said patent, or may respond to dcpres sion of such key in any preferred manner so that as arm` 2 l1 is rocked in the keyboard clear" ing operation, lever 22! l operated to centralise the change lever Pivotied upon change lever 225 is a pawl 224, having a stud cooperating with a segmental flange 225 of a disk fixed upon differential actuator shaft li, these parts being operable to move the change 8. lever into one or the other of its active positions upon the iirst cycle of a registering operation, in accordance with the disclosure of Patent No. 2,260,291. As lever 220 moves into operative position, a locator arm 225, pivoted thereon, will be allowed to drop under the influence of a spring 221, locating the parts by contact of arm 226vwith a stud 228, fixed in the framing, and also disfplacing pawl 224 so that the stud thereof will be located inside the iiange 225, so that the stud will not be contacted by said flange until lever 220 is again brought to centralized position. When frame 111 is lowered the stud of pawl 224 will be located within the flange 225, and will not be contacted thereby, whether the change lever 220 is in operative or neutral position, so that the lever will not be set during a non-registering operation of shaft il, and will not be centralized in non-registering operations other than keyboard clearing.

The product-dividend register i3 and the multiplier-quotient register E15 may be cleared under control of keys 235 and 230 respectively (Figs. l and 16). The stern of key 235 has a pin engaging one arm of a bell crank lever 231, and the stem of key 235 has a pin engaging one end of a bell crank lever 235 related each to the clearout setting means of one of the registers. The pin of key 255' also engages a bell crank lever 201, the bell crank lever 238 related to key 236 being provided with a lug 239, overlying the same end of bell crank lever 251. Therefore, upon depression of key 235 or 235, bell crank 201 will beoperated, to provide for dropping of the frame 11 into non-'registering position and for the restraint of the carriage shift coupling, as follows:

To bell crank lever 201 is attached a link 208 I (Fig. le) having pin and slot connections with a lever 200, and with the blocking pawl |86, and link connection 233 with an intermediately pivoted arm 23d. The rear end of arm 234 (Fig. 16) is provided with a lug, adapted upon operation of links 200 and 235 to move into the path of a rearward extension of lever ipreventing coupling of the carriage shifting mechanism.- Lever 259 has link connection 2l0 with arm 24 fixed upon the rock shaft 425, and as key 235 or 236 is depressed link 258 will be pulled forwardly and rock shaft 225 rotated clockwise, to provide for a cycle of motor operation. Forward movement of link 205 will also move blocking pawl 436 into position to block effective movement of lever 59 thereby provide for breaking of the toggle E15 and the lowering of frame 11 during the operation of the machine. Selection of the register or registers to b cleared is effected as follows: Bell crank Vlever 231, the arms of which are connected by a U- shaped portion, has link connection 240 with an arm 251i fast to a shaft 252, while bell crank lever235 has link connection 2133 with an arm 2M fast upon a sleeve 245, mounted on shaft Shaft 22 and sleeve 255 are adapted to be rocked independentlyl, upon depression of he keys 255, 235, and to be moved independently in a longitudinal direction during a clearing operation. The clearing mechanisms controlled by the shaft and the sleeve are substantially identical, and only one of such mechanisms is illustrated in the drawings.

l /Fast to shaft 222 is an arm 256 (Figs. 3 and 8) movable, upon rocking of said shaft, into a groove of a collar 258. As will be described more fully under the heading Automatic Division, collar 258 is moved laterally during the first half cycle of operation of the auxiliary clutch 58, so that shaft 242 will now be moved endwise, against the tension of a suitable spring (not shown). Fast to shaft 242 is an arm 241 (Fig. 6), engaging a groove in the hub of a cam 248, having slidable splined connection with the shaft |95 which, as previously set forth, is driven during operation of the machine by the main clutch. Lateral movement of shaft 242 will move cam 248 into operative relation with a roller 249 mounted on an arm |31, said arm being fast to a shaft |38. Arm |31 has link connection |35 with an arm |49, having splined connection with the carriage supporting rod |18. Fast to the left hand end of rod |18 is an arm |4| having link connection |42 with an arm |43 of the clearing shaft |44.

Clearing shaft |44 is provided with a series of arms |45 to which are attached slotted clearing links |45, the slots of which are so designed as to engage one of two opposed lugs |41 of the links with a projection |48 fast to the related numeral wheel and to move said projection into position between the opposed lugs, bringing the related numeral wheel into zero registering position.

The clearing devices are restored to normal position, during the last half cycle of the auxiliary clutch, as follows:

In the normal position of the parts a cam 45, mounted upon shaft 6|, has its high point opposite an arm |50, secured to the shaft |38. During the first half cycle of the auxiliary clutch, this cam will be rotated out of the path of movement of arm i, allowing arm |31 and shaft |38 to be rocked by carn 248. During the nal half of the auxiliary clutch cycle, cam |49 will engage arm |50, and restore the parts to normal position.

Automatic division The dividend having been registered in the numeral wheels I3, the divisor set on the keyboard I8 and the carriage 2 properly positioned, the calculation of a quotient will be initiated by the depression of division key 255 (Fig. 2) Upon depression of this key a pawl pivoted thereon, will take a bearing upon a stud xed in the machine frame and will contact the lever 239, rocking the saine, and thereby the shaft |25, counter-clockwise, to set the machine for subtraction and to trip the auxiliary clutch 58 in the same manner as these operations were performed under the control of the minus bar |2i. The key is heid temporarily in depressed position by the operation of a spring latch 252. Depression of key 255 also serves to adjust means whereby, upon operation of the auxiliary clutch, a division program control mechanism will be set to operative position. For this purpose an anti-friction roller on the stem of key 252 will operate upon the cam end of a link 253, having pivotal connection at its opposite end with an arm 254, fast upon a shaft 255. As seen in Figs. 3 and 8, a second arm 255 is fast upon the shaft 255, said arm having a pin and slot connection with a plate 251, rigidly secured to one end of the sliding collar 258, mounted upon a sleeve 259, fast upon the shaft 6| of auxiliary clutch 53. Collar 252 has a set screw, engaging an annular cam groove of sleeve 259, so that, collar 258 being held against rotation by the arm 255, said collar will be moved toward the right (toward the left in Fig. 8) during the first half cycle of clutch 53 and will be returned to the left during the nal half cycle of that clutch. When plate 251 is rocked by depression of the division key 259, a lower extension of said plate will be brought into line with a plate 264, fast upon an endwise slideable progr-ain shaft 255|. During the rst half cycle of operation of clutch 58, following the depression of division key 252, shaft 2M will be moved toward the right, by plate 251, against the resistance of a spring 252, and will oe latched in this position by engagement of a spring latch 253 with the face of plate 25%.

with plate 25S and with shaft 25| is a laterally acting cam 264 (Figs. 4 and 5), this cam acting upon setting of program shaft 25| to rock a lever 265, fast upon a stud shaft 256, upon which an arm 251 is also fast. Arm 2751v (Fig. 2) has connection with a link 252 having pin and slot connection with the arm 14 controlling the release of the main clutch from the rock shaft |25. This release having been effected by the operation of arm 59, link 228 will be advanced, to hold the parts released during the rest of the division operation.V

The divisor having been subtracted from the r higher order digits of the dividend until the registration in'numeral wheels I3 becomes negative, the stopping means will be tripped by the operation of the tens transfer to the left hand numeral wheels, whereupon the auxiliary clutch 53 is engaged for its nal half cycle of operation the main clutch is disengaged, and the drive brought to rest in full cycle position, all as previously described. However, program shaft 25,! being located. in operative position, the final half cycle of clutch 53 will effect the continuance of the division program, by initiating a shift of the register carriage 2 one step toward the left.

For this purpose a one-toothed Geneva wheel 265, fast upon clutch shaft'l (Figs. 6 and 8) operates upon a pin wheel 210, fast upon program shaft 25|, to rotate the program shaft a quarter of a revolution, clockwise as seen in Fig. 6. In the normal, non-dividing, position of the parts the tooth of Gen-eva wheel 259 passes idly beyond the end of a short tooth of the pin wheel 21E), whereas in the division position the Geneva wheel acts upon all four pins of the wheel 213. Upon the right hand end of program shaft 25| is a cam 21| (Fig. 2) operable upon the first and third quarter rotations of the program shaft to move a link 212 forwardly and hold it in forward position until program sha-ft 25| is again operated. Link 212 has pin and slotv connection 213 with the division key latch 252. Therefore, during the final half cycle of clutch 58, the division key will be restored, and the subsequent operations will be controlled entirely from the program shaft. Latch 252 has an extension 214 engaging a pin xed in the blocking pawl |35, so that the movement of link 212 will rock the blocking pawl into position to limit the throw of arm 55, so that the toggle |8i will remain 11D.- broken during the succeeding operation of the auxiliary clutch 58 and the toggle |19 will be broken and frame |11 moved Vinto carriage shifting position.

The rst quarter rotation of program shaft 25| .also the machine for single cycle (carriage shift) operation, for which purpose a disk 215 (Fig. 7), fast upon program shaft 2t i, is provided .'ith two diametrioaliy opposed pins, operable in the rotation of the shaft to displace a Vlever 215, and thereby move a rod 211 forwardly. Rod 2li, as seen in Fig. has arcuate slot engaging a ll stud 218 fixed in the machine framing, so that as the rod is moved forwardly, the forward end of rod will engage the arm i?, rock the shaft H25, and then disengage the arm whereby plate I 23 will be moved to depress the rearward end of lever it, carrying the pawl i36- downwardly, beneath the lug of trigger 3l. It will be recalled that in this position of the parts, latch 58 will be released upon the first cycle of operation and paWl 35 will trip the trigger@ i, to effect the stop.

Finally, in the first quarter rotation of program shaft 25 i means will be put under spring tension, whereby'as soon as the parts are normalized, at the end of the last half rotation of clutch 53, the direction of rotation of the drive will be selected and the auxiliary clutch 52 again engaged. This spring operated means comprises a three-armed member 2te (Figs.4 8 and ll) loosely mounted on and laterally adjustable with program shaft 26| and having at its right hand end spring connection 280 (Fig. 7) with the disk 2'l5, relative movement of the parts being limited by engagement of shouldered hub extensions Zita, Figs. 7 and 8. The'three arms of member 219 are individually operable during successive v quarter rotations of shaft 2t! to move a pawl 285 in counter-clockwise direction as viewed in Fig. ll, and a pin 232, xed in one of the arms of the member, is operable to move a pawl 233 clockwise. Pawl 28! is designed to set the friction band lll of the main clutch, to effect subtractive or left shift movement of the driving mechanism, while pawl 223 is designed to tighten the friction band t5, to effect additions. It will, therefore, be seen that in the complete rotation of the program shaft pawl 28E' will first be rocked, then pawl 283, and thereafter pawl 25| will be rocked twice, this giving a program of left shift (following the subtractive operations) add left shift, and subtract.

In the normal position of the parts pawls 28! and 233 engage opposite edges of a flanged member 284i, fast upon the shaft 88 of the rocker 52 of the main clutch. During the last half rotation of clutch 58, rocker 52 and flanged member 284 will be returned to normal position, thus bringing the parts into the position illustrated in Fig. 11. The advance of the program shaft will now tend to r0- tate the three-armed member 2id, but engagement of the pawl 28| or 233 with the edge of flange 286 will hold member 2l@ and tension spring 239 As soon, however, as lever 84 (Fig. 10) has escaped fromyprojection 33, rocker 52 will be free to rotate, and spring 280, acting through member 2W and the pawl 28l or 283.5,.will rotate shaft 88, resetting the rocker 52 for subtraction or addition and releasing the auxiliary clutch 58.

This action, occurring after the first quarter rotation of the program shaft, sets the drive for left shift and initiates the operation.

After the shift to the left is completed, the second half rotation of auxiliary clutch 58 will rotate the program shaft through its second quarter of movement, whereby cam 2H will release the blocking pawl E35, to provide for a registering operation, and pin 282 of three-armed member 2i9 will operate pawl 283 to effect additive rotation of the drive.

The program of subtractive operation; carriage shift; additive operation and carriage shift will nowcontinue until the register carriage has been moved into its extreme left hand position, or until a stop key is depressed, whereupon the current program will be completed, the machine brought to rest and the parts restored to normal.

Ordinarily a division operation is started with ythe register carriage 2 in its extreme right hand position, but it will frequently be convenient to start the operation in other shifted positions of the carriage. Therefore, the first registration in the extreme left hand shifted position of the carriage may be either additive or subtractive. In carrying out division by the present method there is always an overdraft at the end of any subtractive series of operations, and hence the correct quotient will not be registered at this time on the register llt. On the other` hand, at the end of any additive series of registrations, the register i3 will stand at zero or will register a remainder which is less than the value of the divisor, and the correct quotient digits will be registered in the wheels Therefore, when the register carriage 2 is moved into its extreme left hand position, if the succeeding registering operation is to be additive, the additive registrations will complete the calculation to the capacity of the machine, whereas if the succeeding registration is to be subtractive, the subtractions must be followed by a cycle of additive registration,V to correct the overdraft. As register carriage 2 is shifted into extreme left hand position, a cam plate 2&5 (Figs. 3 and 8), mounted upon the carriage, will operate a lever 235 having link connection 28? with the latch 223, lifting the latch slightly away from its full latching position. The plate 25? is formed as an irregularly shaped disk, one portion ofthe periphery being of greater radius than the remainder. Latch 253 is formed with a notched surface, and if it is lifted by cam 285 at a time when the program calls for a subtraction in the next registering operation, the high portion of plate 26E] will prevent the complete release of the yplate from latch 263,

the plate engaging the notched portion of the from the latch, will be moved again slightly toward the left, by action of the spring 252, bringing a shoulder of the cam 261i into contact with the lever 255, and thereby preventing a full escapement of the program shaft to inactive position. Subtraction will be followed by an idle op eration of the carriage shifting means (resulting merely in the displacement of pawl l Se) and this idle operation will be followed by an additive registration. Upon the completion of the additive operation, program shaft 26E will be rotated into its three quarters position, and another idle operation of the carriage shift means will be effected. As the program shaft moves out of its three-quarter position a cut-away portion of cam 264 will be brought opposite the contacting poi'- tion of lever 265, thus finally freeing program shaft 255! for return to its inactive position, and carrying the three armed member 21S out of the plane of 4pawls 22E and 283. Thus the final step of movement of program shaft Zei is ineffective to continue the operation. it will be obvious that if the carriage shifts into its extreme left hand position when the program calls for addition during the succeeding registering operation, movement of latch by cam 285 will free the latch from plate 25E, and the program shaft will be temporarily held by lever 2te.

The return of program shaft 26E to left hand position disengages all of the controls thereof,

except for the lever 255 and except that Geneva wheel 269 is still opposite the long teeth of pin Wheel 212. Therefore, during the final half cycle of clutch 58, Geneva Wheel 239 will operate to bring the program shaft into its normal or full cycle position, ready for the start of the nez; division calculation. This rotary movement oi the program shaft will bring the low point or channeled portion of cam 254 opposite the contacting portion oi lever 255, allowing said lever to return to normal position, under the influence of a spring 23S (Fig. 2), whereupon the coupling will be re-establislied between rock shaft l 25 and the clutch rocker 52.

A division calculation may be terminated at any time, upon depression of a stop key 23S (Fig. 2), the stem oi this key operating a lever 226, fulcrumed at 29! on the framing and connected by a link 292 with the lever 28d. Thus dep ession of the stop key will lift latch 263 in the saine way that said latch is liited by the action of cam plate 285, and the operation will be terminated upon the completion of the current division program.

I claim:

l. In a motor driven calculating in chine having a shift-able carriage and a register mounted thereon; cyclic universal drive means, means operable to stop said drive means in full cycle position, a pivotally mounted frame, differential actuators mounted upon said frame, movable thereby into driving connection with the register and operable by said drive means, carriage shifting means including driven elements and driving elements operable by said drive means and engageable with the driven elements under control of said frame, and means operable to adjust and hold said frame in adjusted position.

2. In a motor driven calculating machine having a shiftable carriage and a register mounted thereon; cyclic Auniversal drive means, means operable to check the drive means at a position beyond and to return it to full cycle position, differential actuators for said register operable by said drive means, a carriage shifting train including driving elem-ents operable by the drive means, driven elements in operating connection with the carriage, a c .itch engageait-le to connect the driving and driven elements, and lost motion transmission elements in said carriage shifting train operable upon engagement of said clutch designed to prevent overrun and return or the carriage by the drive checking means, and means operable alternatively to engage the difierential actuators with the register or to engage the carriage shift clutch.

3. In a motor driven calculating machine having a shiftable carriage and a register mount-- ed thereon; cyclic universal drive means, means operable to check the drive means at a position beyond and to return it to full cycle position, differential actuators for said register operable by said drive means, a carriage shifting train including driving elements operable by the drive means, driven elements in operating connection with the carriage, a. clutch engageable to connect the driving and driven elements, and lcst motion transmission elements in said carriage shifting train operable upon engagement of said clutch designed to prevent ove run and return of the carriage by the drive checking means, means operable alternatively to engage the difierential actuators with the register or to engage the carriage shift clutch, and means for holding the wel operable by said reversible drive carriage shifting means including driven .ling elements operable by said .ile drive means, a spring urged member operable to engage the driving and driven carriage shifting elen fnts, adjustable means normally holding the differential actuators in engavement with the register holding said spring u ged member under restraint, means for adi' t g the holding member to disengage the actua `s and release the spring urged member, and manipulable means including elements operable to control the adjustment or" the holdi' g member, elements operable to restrain the spi og urged member and elements operable to the non-registering means with the driving means.

5. In a motor driven calculating machine having a denominationally shiitable carriage and a register mounted thereon; the combination with cyclic reversible drive means, means for initiating forivard or reverse operation of said drive means, means for stopping said drive means in full cycle position, diierential actuators for said register operable by said drive means and adjustable out of driving relation with said register, value selection means for said actuators, carriage shiing means adjustable into driven engagement With said drive means, devices operable to adjust said actuators out of driving relation with said register and thereupon said carriage shifting means into engagement with said drive means or alternatively to adjust said actuators into normal driving relation with said register and thereupon said carriage shifting means to normal disengagement with said drive means, and means operable by said register tc initiate operation of said stopping me of settabie program means for controlling a series or successive alternate registering and carriage shifting operations, including elem-ents operable upon each operation of said stopping means by said register to cause said devices to eicot the non-driving adjustment of said actuators and the driven engagement of said carriage shifting means, and to effect operation of said drive initiating means to initiate operation of said drive means in a given direction; elements operable during each engagement of said carriage sluiting means to actuate the stopping means at the end of a single shifting cycle; and elem-ents operable upon operation of said stopping means for each of said single shifting cycles to cause said devices to eiIe-ct the driving adjustment of said actuators and the disengagement of said carriage shifting means, and to eiiect operation of said drive initiating means to initiate operation of said drive means in one and alternately the reverse direction.

6. In a calculating machine having a motor, a register, means for performing a non-registering iunction, cyclically operable universal drive neans normally disengaged from and engageable with said non-registering means, a main clutch engageable to connect said drive means with the motor, means for stopping said drive means in full cycle position, differential actuators for said register operable by said drive means and adjustable from normal operative engagement With said .register to disengagement therewith, norn mally--inefective control means for iirst disen gaging the actuators from the register and subsequently reengaginfg the actuators therewith and eoncom-itantly engaging the drive means with the non-registering means and subsequently disengaging the drive means therefrom, a normally7 ineffective Vnon-registration determining member settable to render the control means eiective, a cyclically operable auxiliary clutch engageable to connect said control means with the motor, a detent norm-ally disengaging said auxiliary clutch in i-ull cycle position, manually operable means for releasing said detent to engage said auxiliary clutch for a single cycle of operation and for setting said non-registration determining member, means operable by the auxiliary clutch to engage the main clutch, a second detent operable after the first named action of the control means to disengage the auxiliary clutch in mid-cycle position, and means operable by the stopping means to release the auxiliary clutch from said second detent to complete the action of the control means.

EDWIN F. BRITTEN, J a.

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

UNITED STATES PATENTS Number Name Date 1,773,027 Chase Aug. 12, 1930 1,806,070 Luttropp May 19, 1931 1,853,290 Walter May 17, 1932 2,034,724 Kottmann Mar. 24, 1936 2,068,899 Anneren et al Jan. 26, 1937 2,161,767 Walter Dec. 7, 1937 2,148,760 Lerch Feb. 28, 1939 2,215,263 Eichler Sept. 17, 1940 2 216,659 Avery Oct. l, 1940 2,297,243 Pott Sept. 29, 1942 2,310,280 Friden Feb. 9, 1943 2,333,234 Boyden et al Nov. 2, 1943 2,339,616 Chase Jan. 18, 1944 2,367,386 Crosrnan Jan. 16, 1945 2,379,877 Britten July 10, 1945 2,382,661 Pott Aug, 14, 1945 2,419,760 Britten, Jr. Apr. 29, 1947

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