Patent GB-191011810-A (GB)
Title: Improvements in Calculating Machines.
Inventor: MOE ADOLF THORVALD
Filed: 1910-05-12
Granted: 1911-03-09
Abstract: 11,810. Moe, A. T. May 12. Adding - apparatus.- Relates to key-operated multiple - bank adding- machines, in which multiplication can be performed by repeated addition, and deals more particularly with t h e key - board a n d the adding-mechanism, the k e y s being provided with interlocking, detaining, and releasing means, and being adapted to actuate a bar, the function of which is to restore the actuating-mechanism for the numeral-wheels when an additional movement due to a transferring operation has t a k e n place, with the transfer mechanism, a n d with the zeroizing-mechanism together with interlocking-means therefor. Keyboards; keyboard interlocks; differential mechanism; multiplying by repetition.-The depression of any key 5<1> gives a differential forward movement to the spring-controlled sliding bar 1 by means of a cam-slot 6 and pin 4, the shoulders 18 preventing the depression of any other key in the same bank. An incline 7 on the key stem also m o v e s rearwards a spring-controlled restoring-bar 9 in connexion with the transfer mechanism. When the key is fully depressed, it is latched by a spring-controlled bar 12, which can, however, be rendered inoperative when multiplication by repeated addition is to take place. The movement of the bar 1 rocks, by means of a rack and pinion, an arm 32 upwards so that the driving-pawl 31 carried thereby passes over the pins 28 of the numeralwheel, rotation of the wheel being prevented by a detent 37. A special key 20, Fig. 8, is next depressed, and the latch-bar 12 of each bank thereby moved forward by a pivoted plate 22 so as to release all the keys. The bars 1 and 9 thereupon return to normal position; the driving-pawl 31 being actuated by the ensuing rearward movement so as to rotate the corresponding numeral-wheel to the proper extent. Transfer mechanism of the externally operated, additional-movement type. Normally, projections 42, Figs. 4 and 7, upon spring-controlled transfer-levers 39 engage beneath shoulders upon the driving-pawls 31, and limit the motion of the pawls. At transfer, however, one of a series of projections 30, Fig. 1, upon the arms of the numeral-wheels engages with a camsurface 48 upon the corresponding transferlever and removes it from the path of the driving-pawl, which thereupon continues its movement through an extra step until it comes into contact with a fixed stop 45. Spring-controlled latches 41 keep the transfer-levers displaced, until they themselves are tripped by the downward movement of the actuating-arms 32. The arms 32 are restored to normal position at the commencement of the next operation by the rearward movement of the restoring-bar 9 (see above) which rocks an arm 51, Fig. 1, adapted to engage with a depending arm 53. Zeroizing-mechanism.-To zeroize, a key 67, Fig. 8, is depressed, which disengages all the numeral-wheel detents 37, and a lever 55 is then rocked. The actuating-bars 1 are thereupon all moved forwards through ten steps by means of arms 64 fixed to a shaft 63 and the numeral-wheels are frictionally rotated backwards, through ten steps or less, until one of the transfer projections 30 upon each wheel comes into contact with the base of the cam projection 48. The key 67 is then released, and the return movement of the bars 1 rotates the ' units ' numeral-wheel through ten steps and the other wheels through nine steps; thereupon the ensuing successive operation of the transfer mechanism returns all the wheels to zero. An interlock with the actuating-mechanism comprises an arm 72, Fig. 8, which is adapted to prevent the rearward swing of the lower end of the zeroizing-lever if a key is in its depressed position and consequently a bar 9 displaced.