Patent GB-150970-A (GB)
Abstract: 150,970. Kuhrt, E. Sept. 11, 1920. Multiplying and dividing apparatus.-Relates to direct-product machines of the type employing pin wheels with a variable number of teeth acted upon by multiplication members having recessed portions corresponding to the units and tens of the products of the digits 0-9 multiplied by themselves, and consists in arranging under each row of multiplicand keys a group of nine multiplication plates corresponding to the multipliers 0-9 which plates by being moved laterally can be brought with their units and tens edges alternately into the path of their own or the next lower row of keys, each group of plates being surrounded by a slide which is periodically coupled to the plates and acts on the pin wheels and on printing mechanism. Figs. 1, 2 show the driving mechanism by means of which a to-and-fro movement of the handle 9 results in two complete revolutions of the main shaft 14. A pin 5 passes through a slot 7 in a spur wheel 8 carried by a link 6 moved through a crank 10<1> from the main handle 9 pivoted at 10. The pin 5 moves in a recess in the frame between the outer edge of the recess and a rhomboid-shaped part 4 pivoted at the centre. An arm 13<1> acted upon by a spring 13 presses on the part 4 and has two positions which determine the direction of rotation of the wheel 8 which drives the shaft 14 through a 211 gear. Figs. 2, 7 show the adjustable pin-wheel mechanism. A series of disks 15 on the shaft 14 have pivoted to them laterally moving dogs 16 grouped in an opening in the disk 15 and formed with radially-stepped lugs 17 which. when the dogs lie against the disks, are in the path of pins 23 on a disk 21 in one with the numeral drum 19 of the totalizer. The drum 19 has hollows 20 which lock it when in engagement with the solid part of the disk 15. A fixed cam 44 returns the dogs to the inoperative position. Means for setting the pins are described with reference to Figs. 2, 3, 5. A set of nine multiplication plates 25, Fig. 5, is arranged under each row of multiplicand keys 46, the recesses 26<1>, 26<11> in the edges corresponding to the units and tens of the products of the numerals 0-9 by themselves. A slide 27 surrounds each set of plates 25, the slide being reciprocated longitudinally, while the frame 24 in which all sets are mounted is reciprocated laterally once during each operation of the machine. The frame 24 is moved near the ends of the stroke of the handle 9 by pins 39, 40 on the crank 10<1> engaging an incline 41 on the frame 24. The slide 27, which has an upstanding portion 27<11> in front, is acted upon by a spring 27<1> when an arm 28 fixed to a shaft 28<1> is rocked away from a pin 29 on the slide by means of a cam 30 on the shaft 14 engaging an arm 30<1> fixed to the shaft 28<1>. The slides 27 are bridged by a beam 32 provided with a lip 31 for each slide disposed in slots in the beam. When one of the multiplier keys 33 is depressed, the beam 32 is raised by a lever 35 to a corresponding amount. The slides 27 pass between the setting wheels 15, and each slide has two projections 42, 42<1> which may come into the path of the dogs 16 in order to set the latter. One projection 42 is for addition and multiplication, while the other is for division and subtraction. In operation, the multiplicand is set on the keyboard and the multiplier key depressed, raising the beam 32. The handle 9 is now operated and the slides move forward until arrested by the engagement of the selected plate 25 with the depressed multiplicand keys. The slides and consequently the dogs 16 are thus first set to the units of the products of the key values of the multiplier key 33 and the depressed keys 46, which values during the first rotation of the shaft 14 are thrown into the totalizer. Near the end of the first revolution of the shaft 14, the frame 24 is moved to the right, and the tens edges position the slides for the tens of the products referred to, which are then transmitted to the totalizer during the second revolution. The transfer mechanism between the denomination drums of the totalizer is of ordinary construction, and the totalizer is traversed for multiplication by a multiplier having several digits. Nine multiplier keys 33 and nine rows of multiplicand keys 46 are provided, the keys 33 having spring- pressed locking plates which lock the depressed key until another key is depressed. Each row of keys 46 has nine locking plates, an incline of each of which is engaged by lugs on a key, the lugs passing through triangular holes in the other plates so that the depression and locking of one key releases all others. The locking plates 48 are bent at their ends so as to display the value of the key at the opening 49. The members 27 are formed with racks 77 by which printing wheels 52 may be set. The amount on the numeral drums of the totalizer may be transferred to the printing wheels 52 by sliding the totalizer so that the slotted disks come into the path of a projection 82 on the member 27, so that when the machine is operated, the projection enters into a slot and the rack 77 differentially sets the printing wheel 52 to the digit shown in the corresponding drum of the totalizer. The Specification as open to inspection under Sect. 91 (3) (a) comprises also printing mechanism consisting of wheels 52 carried on arms 53 pivoted to a common shaft 55, the arms being connected by links 57 to a two-armed lever 62 worked by means of a cam-groove and roller from the main shaft 14 to effect an impression on a platen 66. Mechanism for preventing the printing of unnecessary zeros to the left is also described. This subject-matter does not appear in the Specification as accepted.