Patent GB-509747-A (GB)
Abstract: 509,747. Calculating-apparatus. MONROE CALCULATING MACHINE CO. Jan. 12, 1939, No. 1092. Convention date, Jan. 21, 1938. [Class 106 (i)] A machine for controlling the repeated registration of a multiplicand includes differential multiplier entering members and multiplier storage wheels comprising transmission gears with elements for determining their zero positions mounted on a reciprocatory frame, drive means for transmitting the multiplier value from the said differential members to the transmission gears, cam means for displacing the frame to bring the gears into operative relation with the storage wheels and drive means co-operating with the zero determining elements to affect transfer of the value from the gears to the storage wheels. The invention is shown applied to a Monroe calculating machine as described in Specification 216,174, [Class 106 (i)], in which items set up on the numeral keys 18, Fig. 6, can be registered additively or subtractively, through the action of pairs of setting bails 19 and actuating gears 5 upon totalizer pinions 13 in a laterally movable carriage 2. Multiplier setting mechanism. The multiplier is set up on the right hand columns of the keyboard and the setting bails 19 are formed with extensions 20, Figs. 6 and 13, co-operating with actuating gears 6 similar to the gears 5. The left hand gear 6 of each pair is provided with four stepped teeth for the digits 1 to 4 while the right hand gear has six teeth for the digits 5 to 9; six teeth are provided as multiplying for the higher digits is effected by the short-cut or subtraction method. The gears 6 co-operate with spool gears with teeth 8, 8a. Depression of the multiplier key 1, Fig. 2, through a linkage 10, 11, 12 and 14 rocks an arm 15 having a latch connection 22 with a clutch arm 24. The movement of the clutch arm through a linkage 102, 103 and 104 closes the motor switch 99, Fig. 4, and permits a one revolution clutch 26 of known form to rotate whereupon a gear train 27 transmits the setting of the gears 6 to the spool gears 8. The spool gears are carried in a rockable frame 29, 30, Figs. 6 and 8, having a latch connection 35 with a rock arm 36 co-operating with a cam 37 on a shaft 7 so that after the setting of the spool gears the frame is rocked to mesh them with the storage wheels 3. During the setting operation a segment gear 41 on the shaft 7 operates, through a gear train 40, Fig. 11, to rotate the shaft 39 and to bring a series of segment gears 42, Fig. 7, thereon into position for engagement with the teeth 8a of the spool gears. After the setting is completed the gears 41 rotate the gears 42 and the spool gears are rotated back to zero position determined by a mutilated tooth and at the same time transmit the setting to the storage wheels 3. Each wheel 3 has secured thereto a set of control cams 67-69, Figs. 9 and 10. The wheels are freed to take up a setting by a cam 70, Fig. 11, on the shaft 39 operating a bail 74 to withdraw teeth 75 thereon from notches in the control cams 68. At the same time a rearward extension 200 of the bail 74 raises a pivoted link 198, Fig. 7, to place a shoulder 201 thereon into position to engage a shoulder 204 of a bail 205 and to free it from a shoulder 202 of a lever 203. The lever 203 and bail 205 control the right and left hand shifting of the carriage. During the latter part of the setting operation the actuating gears 6, setting bails 19 and keys 18 are restored to normal by a projection 49, Fig. 11, on the frame member 30 operating a slide 53 and cam lever 54 to displace a clearing slide 60 and to free the locking bails 62, Fig. 13. Multiplication control mechanism. The cams 67, 69 of the storage wheels 3 co-operate with control fingers 126, 126a pivoted, on rods 127, 141 supported by bails 128, 142. The fingers also co-operate with pairs of cams 125, 125a secured to a shaft 124, the cams in certain positions acting as fulcrums for the fingers to cause movement of the bails. The shaft 124 is also provided with a series of helically arranged cams 147 adapted to co-operate with bevelled discs 144, Fig 9, slidably arranged on a shaft 143, each disc being provided with a three toothed gear 145. Multiplicand setting and machine operation. The multiplier having been stored the keys are depressed to set up the multiplicand on the gears 5 and the multiplication key is depressed to initiate the operation. Depression of the key pulls a rod 79, Fig. 6, forwardly and, through an arm 80 and latch 83, rocks a clutch arm 87 to free its clutch 89 for one revolution. The clutch drum carries an eccentric 92 to operate a rock arm 94 which, by its end 149 engaging a single toothed disc 148 on the shaft 124, angularly displaces the shaft 124 to bring the cam 147 for the units denomination into operative position. The rock arm 94 also engages a bell crank lever 108 to move it into engagement with a latch 112 on a shaft 115 thereby placing a spring plunger 107 into operative relation with a projection 106 'on the clutch lever 87. The clutch lever 87 has a latch 119 co-operating with an arm 121 on a shaft 122. Upon completion of this preliminary cycle the plunger 107 will restore the clutch arm 87 and the latch 119 will rock the shaft 122 to initiate an additive cycle by means of an arm 139, Fi.g. 4, operatively connected to a link 131 pivoted to an arm 130 of a shaft 129 to which the bail 128 is secured. The link 131 is formed with projections 132, 133 one or other of which, depending on the position of the shaft 129, co-operates with projections on a bell crank 135 to cause the bell crank to rock in one or other direction to set the main clutch lever 111 and known reversing mechanism 105 to initiate an additive or subtractive cycle, the motor switch 99 being closed at this time by the action of a stud 152 on the clutch lever with a lever 156. The bell crank 108, through a link 188, Figs. 6 and 7, rocks a lever 189 and frees a latch 192 to engage an arm 194 serving to set cycle controlling means. The shaft 150, which drives the shaft 143, carries a cam 165 to release the latch 119 and allow the shaft 122 to return to normal. The clutch lever 111 is, however, held in adjusted position by a detent 168 for successive operations. During each cycle the shaft 143 is rotated one-third of a revolution - and drives the units storage wheel 3 backward step by step. As the wheel approaches the zero position its cam 69 causes the associated finger 126a to bear on the cam 125a and thereby rock the bail 142. The bail 142 is connected by a link 170, lever 171, and connecting rod 175 to a lever 176, Fig. 7, with a trigger 178 adapted, during the movement of the bail, to trip a latch 179, Fig. 4, and release a pawl 180 on an arm 182 to engage it with a projection on a rock arm 160 operatively connected to an operating shaft 164. During the forward movement of the arm 182 with the rock arm 160 a notch 283 thereon frees a stud 284 on the clutch lever 111 which thereupon moves to central position to release the clutch. The return of the arm 182 under spring action restores the pawl 180 to engaging position with the latch 179. The machine is then ready to deal with the next higher digit of the multiplier. For digits "5" to "9" the six toothed gears are moved to align a cam projection 293 thereon with a projection 294 of carry fingers 295 so that when the spool gears 88a are rocked into engagement the operative extension 297 of the fingers will advance the next higher spool gear one step. The setting also of the control cams 67 of the storage gears 3 is such as to rock the shaft 129 and raise the link 131 to a position to effect a displacement of the'bell crank 135 to set the clutch lever 111 for subtractive operation. The cams 67 are adapted to control the fingers 126 for a digital setting of " 5 " but remain inactive for a setting of "4" plus a carry. For the right hand column the gear 6 has only five teeth and the finger 126 is omitted the multiplication being effected by additive cycles only. Carriage shift mechanism. The forward movement of the arm 182, through its hub 206 and the arm 194, Fig. 7, rocks a lever 207 and arm 196. The arm 196, through a link 198 rocks the bail 205 and a latch pawl 212, Fig. 14, pivoted thereon co-operates with a clutch arm 214 to release a clutch 216 for one revolution. The bail 205 is held in displaced position by toggle arms 219, 221. The clutch drum is formed with a worm thread 223, Fig. 16, adapted to effect a shift of the carriage by engaging ,a rack formed of tooth sections 479 pivoted on the carriage. The clutch 216 carries an eccentric 224 co-operating with a rock arm 226 that carries a pawl 228 to operate a ratchet wheel 229 on the shaft 124 to set the cams 125, 125a of the tens denomination into operative position with relation to the fingers 126, 126a. Movement of the bail 142, on the restoration of the units storage wheel, lowers a finger 230 pivoted thereon so as to free a trigger 233 on a bell crank 234, Fig. 14, loose on the shaft 95 so that if a significant digit is set up in the tens denomination the bail 142 will return to raised position and lift the finger 230. The finger 230 has pin and slot connection with the rock arm 226 and when the rock arm is restored the finger 230 will rock the bell crank through the trigger connection and will rock the pawl 212 to free the clutch arm 214 and break the toggle connection to permit the bail 205 to return to normal position and uncouple the clutch 216. The bail 205 through a hooked arm 256 operates the shaft 122 to initiate another cycle of operation. During this cycle a cam 257 on the shaft 150 co-operates with the arm 256 to allow the parts to return to normal. During an operation of the bail 205 the trigger 178 is restored to normal by a stud 247 on the bail rocking a bell crank 246 to raise the hook end of the rod 175 out of engagement with the lever 171. If no digit is set up the control finger 126a wil