Patent GB-543307-A (GB)
Abstract: 543,307. Calculating-apparatus. MERCEDES BUROMASCHINEN-WERKE AKT.-GES. Oct. 30, 1939, No. 28968. Convention date, Nov. 7, 1938. [Class 106 (i)] In an adding and subtracting machine a control mechanism and a transfer member associated with the totalizer wheel of highest denomination is effective, when the value entered passes through the zero position, to initiate locking of the amount and operation keys, to drive the machine for a second cycle during which the fugitive one is entered, to prepare the controlling mechanism for total or sub-total taking, and to cause printing of symbols corresponding to a negative value in positive form or to a positive value. The machine is preferably motor-driven and has a single bank of amount keys 12, Fig. 1, and a set of six operation keys 13, Fig. 26. When a key 13 is depressed, a member 60a, Fig. 2, switches in the motor and the depressed key is locked. The main shaft 10 for each cycle rotates 90 degrees clockwise, Fig. 1, and then 90 degrees counter-clockwise, at the end of which it normally switches out the motor and unlocks the keys. When an amount key is depressed a wheel 310-one for each denominational sector 1-is differentially set, the wheels 310 being carried on a setting. carriage in known manner. The slotted sections 1 are guided on rods 16 and 17, carry type 9, and are toothed to coact with constantly meshed add and subtract wheels 6 and 8 respectively, which latter are mounted in a movable totalizer frame 4 pivoted at 257 and actuate gears 8a driving indicating wheels 8b, 42, which show at a window in the casing. Frame 4 is rocked in the direction of arrow 5 or 7 for addition and subtraction respectively. Under the control of add and subtract keys 13, the wheels 6 or 8 are rocked to coact with the sectors 1 on their return stroke. Assuming the amount 575 has been introduced into the totalizer 4 additively and that the amount 752 is to be subtracted, after the first step the indicator rollers 42 of the eleven-place totalizer 4 show " 000 000 005 75." The amount 752 is set up on keys 12 so that the first three wheels 310 are set to "7," "5," and " 2 " and moved into active position relatively to sectors 1 for the hundreds, tens, and units. Subtraction key 13 is depressed and moves a bar 60 and a pusher 59 so that a lue 58 on the latter causes the key to be locked down; at the same time a hook or pusher 59 rocks a lever 71, 72, 75 so that the end of arm 75 turns a locking strip 77 to engage the lugs 78 on the key bars of the amount keys 12. The bar 60 also moves the member 60a to switch in the motor. As the shaft 10 moves clockwise, the totalizer moves in the direction 7 and wheels 8 mesh with racks 3 on sectors 1. The setting wheels 310 are returned to zero, shifting the sectors 1 in the direction of arrow 2 according to the amount 752. As the hundreds wheel 42 passes from "0" to " 9 " the tens transfer cam 40 on the hundreds wheel 8 initiates transfer which is completed to the next higher wheel by a corresponding member .31. This next higher wheel then also passes from "0" to " 9 " and so on, whereby consequent transfers cause all the wheels to the left of the hundreds to be set at " 9." As the highest wheel turns from "0" to " 9 " the transfer cam 40 of the corresponding wheel 8 moves the member 38, 31, arranged to the left of the highest sector 1, into the position of Fig. 2. A pin 44 on the left-hand member 31 rocks a coupling frame 47 in the direction of arrow a so that slide 50 is moved to the right, its hook 69 is engaged in notch 67 of a catch 63 and lug 57 of slide 50 engages over a lug 58 on pusher 59 to hold bar 60 against movement. This prevents unlocking of the keys as shaft 10 returns counter-clockwise and holds member 60a in the circuit-making position so that the motor is maintained to' drive the machine for another cycle. Meanwhile the number 752 has been printed by hammer 311 on paper 312, a minus sign is printed off type 272f Fig. 26, to indicate subtraction; and the totalizer 4 is returned to non-calculating position. At the end of the first machine cycle the numeral wheels 42 indicate the true complementary value " 999 999 998 23 " but a movable plate is automatically moved to cover the reading window. During the second cycle the " fugitive one " is subtracted in the units denomination. At the commencement of this second cycle the totalizer 4 is thrown into subtraction position since the subtraction key 13 is still locked down. The frame 47 is rocked clockwise, Figs. 1 and 2, into the position of Fig. 11 (not shown), causing a pawl 23 to rock so that its rivet 28 engages a slot 25 in the rack 3 attached to sector 1 and causes the rack 3 and sector 1 to turn the units gear wheels through one unit subtractively to indicate " 2 " instead of " 3." The wheels now display the complement " 999 999 998 22," corresponding to a negative balance of 177. The shutter again covers the reading opening and as the shaft 10 completes its forward movement in the direction of arrow 11 "00-" is printed on the paper (two noughts are normally printed for all cycles without value calculation) and the minus sign is printed since the subtraction key 13 is depressed. This indicates to the operator that the capacity of the totalizer has been overstepped negatively. The shaft 10 returns against arrow 11, the totalizer 4 returns to normal, the subtraction key 13 is unlocked and member 60a is moved to open the motor circuit. The machine is now ready for the next operation. If, say, value 257 is added, the totalizer 4 is overstepped in positive sense. The keys 12 for value 257 and the addition key 13 are depressed, the hundreds wheel passes through " 9 to "0" and consequent transfers occur to the left so that the totalizer displays 000 000 000 79." The keys are locked down, the motor continues for a second cycle during which the "fugitive one" is added in the units denomination and the shutter is moved to uncover the reading opening and display the true positive value " 000 000 000 80." " Fugitive one " means.-In each of ten out of the eleven denominations the tens-shift member 31 has a pair of cams 38, 39 which co-act with the transfer lugs 40, 41 respectively, Fig. 1, of the subtract and add wheels 8 and 6 in the corresponding denomination of the totalizer. In the units denomination the ten-shift member 31<SP>1</SP>, Fig. 7 is without these cams 38, 39 and without the tail 43. Normally when the parts 38, 40 or 39, 41 initiate transfer by rocking the member 31, transfer is subsequently effected by parts 313, 314, 315 actuating the tails 43 which have been moved relatively to those parts. This does not occur in the units place. The member 31<SP>1</SP> has a pin 122 co-acting with the end 123 of an arm 125 of the corresponding coupling frame 47. In the initial position of the latter, the end 123 is away from the pin 122 by a distance corresponding to the angle the 'frame 47 turns during the first cycle. Arm 125 carries a plate 126, Fig. 9, having a transverse lug 127 which co-acts with lugs 128 and 129 of a pawl 130 (in Fig. 9, parts are shown separated for clearness). A spring 133 tends to pull pawl 130 clockwise, but normally the lug 129 bears against the rear edge 129a of lug 127 and tooth 136 is beyond the path of a hook 137 on a sector 138 which is slotted to slide on rods 16 and 17. Rod 17 moves the sector 138 right and then left, Fig. 9, each machine cycle. When, in the first cycle, the coupling frame 47 is moved from the position of Fig. 1 to that of Fig. 2 the end 123 on the frame 47 engages the pin 122 on the units tenstransfer member 311. The coupling frame remains in this position since lugs 57 and 58 are engaged, Fig. 2. When the frame 47 turned clockwise, Fig. 9, the tooth 136 tended to move upwards but at that moment the sector 138 had been moved by rod 17 so far to the right that hook 137 was beyond the tooth 136. Pawl 130 did not rock and spring 133 was tensioned. On the return stroke of rod 17 and sector 138 to the left, tooth 136 moves up in front of hook 137. Thus during the second machine cycle, as sector 138 moves to the right its hook 137 rocks the pawl 130 clockwise and the latter's lug 129 moves the lug 127 on frame 47 to rock the latter clockwise. The end 123 of the frame engages pin 122 on member 311 and the latter is moved downwards on rods 34 and 35. A slot 30 in member 311 engages a rivet 28 on a pawl 23 pivoted at the side of the sector 1, so that in moving down member 31<SP>1</SP> rocks pawl 23 clockwise, Fig. 9, whereby its end 24 shifts the rack 3 of the units sector 1 through unity in the direction of the arrow 2. Rack 3, through the corresponding subtraction wheel 8, turns the units numeral wheel 42 to subtract one unit. With the totalizer in the add position-wheel 6 engaging rack 3- the " fugitive one will be added if the totalizer capacity is exceeded additively. If the totalizer capacity is exceeded in the negative sense, the resulting complementary value on the numeral wheels 42 may be misleading and means are described-e.g. Fig 17 (not shown)- whereby a shutter covers the reading aperture whenever the wheels 42 carry a complementary value. Total or sub-total-taking is effected by depressing the appropriate keys 13-e.g after the said second cycle, which occurs when the totalizer capacity is exceeded.