Patent GB-191227231-A (GB)
Title: Improvements in Calculating Machines.
Inventor: BALDWIN FRANK STEPHEN
Filed: 1912-11-26
Granted: 1913-11-20
Abstract: 27,231. Baldwin, F. S. Nov. 26. Multiplying-apparatus; detent mechanism. - Relates to the differential and interlocking- mechanism of machines for the four rules provided with a laterally - displaceable totalizing- counter. Fig. 1 is a plan of the machine, partly in section, showing two of the banks of numeral keys 18 for the multiplicand, the totalizer carriage 2 which may be moved laterally by a handle 62 in order to multiply or divide by powers of ten and contains reading- apertures for the totalizer numeral-wheels and for the multiplier-indicator 86, and the main operating-handle 102, which is oscillated, in each position of the carriage, a number of times equal to the corresponding multiplier digit. Fig. 4 shows in transverse section the differential actuating mechanism wherein each spring plunger-key 24 is furnished with a plate 25 appropriately shaped, adapted to control, upon depression, the degree of displacement produced in two pivoted bails 19 associated with the bank whereby corresponding axial movements are communicated to the two members 5, 6 of a compound pinion which bear oppositely facing teeth of various lengths. The pinion is thus adjusted to have a number of teeth corresponding to the depressed key in position to engage with and actuate the corresponding differential actuating-wheel 12 when the whole of the compound pinions, as set, are rotated by means of the main operating-handle. Provision is thus made for nine digits in each bank. The depressed keys are restored by the springs 35 when a universal detent-plate 34 receives movement from the operating-handle in order to release blade-springs 32 upon the keys; buffers 31 at the lower ends of the stems limit the upward movement of the released keys. Independent release for any bank is possible through the operation by the corresponding release key 38 of a disengaging-yoke 35<a> for that bank, whereby the blade springs are pressed against the keystems. The differential actuating - wheels 12 have spring - controlled roller detents 41, Fig. 3, pivoted to a shaft 45 and adjustable by means of a screw 46; but alternatively the pressure of the detents may be automatically varied during the operation by means of a cam upon the main operating-shaft. The numeral - bearing wheels 13 of the product totalizer are mounted in the laterally-movable carriage 2, and are provided with transfer mechanism of the kind described in Specification 14,152/13. By means of a handle 62, Fig. 1, shaft 61, and double crank-arm 63, Fig. 4, the pins 64 may be rotated to lift the carriage by rocking about its pivoting spindle 59, Fig. 2, and to move it laterally by engagement with notches 65, the movement being limited to the normal position of the main operating handle by locking-mechanism comprising an arm 69, 70 interacting with a gapped disk 71 upon the main shaft 73 and with pins 66 upon the carriage. The multiplier indicator 85 is also mounted in the carriage, and is actuated by means of a cam and arm mounted upon the main operating-shaft. ' Zeroizing-mechanism for the totalizer and indicator is described in Specification 14,153/13. A full-stroke mechanism consists of oppositely-arranged spring-pressed pawls w, w<1>, Fig. 16, and an intermediate pivoted piece w<2> engaging pins thereon, all being spring-controlled, and the pivoted piece receiving oscillation by engagement of a tooth thereon with a gap w<4> in a plate x secured to the main-shaft gear 74, with which gear the pawls are put into and out of engagement by the oscillation. A lost motion of half a revolution is furnished between the gear-wheel 74, driven by a train from the main operating- handle 3, Fig. 2, and the full-stroke plate x, this movement corresponding to the two initial positions of the operating-handle shown in Fig. 2, one position relating to addition and multiplication and the other to subtraction and division. These positions are defined by means of a spring pin in the handle engaging with two stops 99. The gear 74 meshes with a gear 75, which is in turn in mesh with a gear 76 adapted to be rotated by the main handle. The gear 75 is provided with a pinion 80 having more than one-half of its teeth removed and meshing with a smaller pinion on the shaft 4, which thereby receives a complete rotation for each half-revolution of the gear 80. The key resetting-plate is operated either upon rotation of the totalizer zeroizing-handle 96 or, at the end of the operation of the main handle, means being provided to disable the parts for repeated addition when required. A spring brake 111, Fig. 3, is provided for the main operating-shaft,