Patent GB-191419145-A (GB)
Title: Improvements in or relating to Calculating Machines.
Inventor: ENBERG JOHN CHRISTER
Filed: 1914-08-27
Granted: 1915-11-29
Abstract: 19,145. Enberg, J. C. Aug. 28, 1913, [Convention date]. Multiplying and dividing apparatus.-A machine of the type employing calculators provided with representations of the partial products, has the calculators arranged in pairs, one representing units and one tens for each product, the representations being capable of acting in a positive or negative sense so that for numbers with a digit above 5 the representation may be the succeeding multiple of ten less the difference. In the construction described, the representations take the form of teeth upon cylinders, the units and tens being on opposite sides of the cylinders and the inclination of the teeth varying according to whether their effect is to be additive or subtractive. These calculators mesh with toothed wheels which transmit their motion to totalizers mounted upon a carriage which is given a lateral movement after each operation of the machine. The result and nature of the operation are recorded by printing - mechanism. The calculators 33, Figs. 2 and 3, are mounted so as to be radially movable in the cylinder and are returned by a circumferential slack spring 41, double arms 53, conveniently staggered and mounted in the cylinder being selectively rotated from a multiplier or divisor keyboard 71, Fig. 1, to project the required calculators. A similar calculator ring 47, Fig. 2, is provided at the end of the main cylinder to operate an indicator for the multiplier or divisor or the number of operations in the case of addition or subtraction, but the calculator is moved out at only one side at a time so as to be operable independently of the direction of movement of the operating-handle 70, Fig. 1, indications being provided for the requisite direction of movement according to the operation performed. Keyboards.-The multiplicand or dividend is set upon a keyboard 4, Figs. 1<a> and 2, the keys of which are arranged in staggered relation. and cause an axial movement of corresponding pinions, which are mounted upon square shafts 13 carrying at their front ends the pinions 74 which gear with the calculators. This axial movement brings the square shafts into driving connexion with spur-wheels 14, which engage the pinions 97, Figs. 1<a> and 40, of the resulttotalizer mounted in the register carriage. A spring band with sufficient sag for the depression of one key only of a bank at a time governs the keys. This mechanism is described in detail in Specification 19,146/14. Totalizing-counters. - The register carriage comprises a fixed part and a movable part, the latter part comprising a drum 101 provided with a helical groove 108 for moving the carriage and a groove 109 for effecting the transfer. The carriage is also tilted by means of a cam to bring the register wheels 97 out of gear with the wheels 14 during the movement of the carriage and during the resetting of the apparatus to change from one kind of operation to another. The carriage is held stationary during the first half-revolution of the carriage for registering the projected unit calculators and is then moved longitudinally through one step to register the tens during the remaining half-revolution of the carriage. This is effected by giving a rotation to the drum 101 by cam mechanism mounted upon the calculating-cylinder; when movement is to be given to the drum, a lever 147 is moved by the control cam mechanism to engage the helical groove in the drum and thus cause it to move the drum axially during its return rotation under spring action. The control of these drum movements is effected by cam mechanism set by the operating-handle according to the operation to be performed. Printing-mechanism is arranged to give a record of the factors and result as well as the nature of the operation performed and the position of the decimal point. Transfer mechanism.-This drum has a number of circular grooves 109, Figs. 1<a> and 40, provided with staggered bulges 110 in which engage levers 112 whose other ends are attached to sectors 115 which are axially movable to engage the register wheels 97 of the next denomination. At transfer of any denomination in either direction, pins 124 or 125 engage barbed spring arms 122 and move the sector 115 through one tooth; the sector is then moved axially by the bulge 110 and lever 112 to engage the next register wheel, and the actual transfer is effected through the engagement with a tail on the sector of one or other of similar tails 129, 130 on sectors 126, 127 which are rotated by the engagement with teeth 111 upon the drum of a spring 131 carried by the sector 127. The staggered arrangement of the bulges causes a transfer seriatim. In a modified construction the spring arms are replaced by a single tooth engaging a jockey pinion in gear with the toothed sectors.