Patent GB-190623173-A (GB)
Title: Improvements in and relating to a Calculating Machine
Inventor: SALCHER ALOIS
Filed: 1906-10-19
Granted: 1907-09-19
Abstract: 23,173. Salcher, A. Oct. 19. Calculating-appar a t u s ; counting- apparatus.-Relates to a multiple-bank, rack-set and operated adding and subtracting - m a - chine, a device being provided to facilitate multiplication and division by repeatEd addition and subtraction. The general construction of all the features of the apparatus is new. Fig. 1 is a plan of the apparatus showing the toothed racks which actuate the counter. Fig. 14 is a view of the underside of the machine, showing the hand-operated slide G which causes all the necessary movements of the mechanism after setting the racks. The toothed wheels e on the spindles of the numeral wheels a, Fig. 1, are situated between the racks u, v carried by each setting-bar r, and are moved laterally into engagement with either one rack or the other, according to whether addition or subtraction is to be performed. A number is set up on the machine by drawing down the racks r through distances proportional to each digit, the number set up being indicated by pointers z and also by numeral wheels y; the bars r are retained in position by pawls acted on by springs w<1> mounted upon a laterally movable plate W, Fig. 7. The slide G, Fig. 14, is then moved upwards by means of the knob A, which is guided by a slot as shown in Fig. 1 ; a wedge H connected to the slide forces the pin V on the frame F, Fig. 14, in which the numeral wheels a are mounted, to one side or the other to put these wheels into engagement with either of the racks u, v the knob is turned a little to select the side of the pin V with which the wedge engages. The transfer device, which is normally locked, is then released and set in position for operation, as described below, and finally the knob A rocks a lever to which the bar W is pivoted at J<1>, Fig. 7, to move the bar W laterally and release the setting-bars r, which are then returned to their zero positions by springs and actuate the counter. Tens are transferred by allowing the corresponding racks to spring back one step beyond their zero positions. The bars rare normally stopped by shoulders p on levers h, Fig. 19, pivoted at h<x> to a bar R, springs h<4> tending to rock the levers so as to allow the bars r to miss the shoulders p and return one step beyond their normal positions. This action of the springs h<4> is normally prevented by pins h<3> on the levers engaging one shoulder of notches R<1> in the plate R, and also by links h' connected at one end to the levers h and having pins h<2> at the other end engaging the inner surfaces of flanges b of the numeral wheels a, Fig. 9. On moving the slide G upwards, the knob A engages the projecting edge S<2> of the slot in the lever S to which the bar is pivoted, thereby rocking the lever S, and moving the bar R to allow the levers h to rock, when notches i in the flanges b allow the pins h<2> to escape therefrom. Wedges j, Fig. 9, guide the pins in their passage from the flanges. The links h' are carried by a bar L attached to a plate K, which swings about its rear edge and by its weight normally holds the links h<1> down with the pins h<2> below the numeral wheels. On pushing the slide G upwards, a projection on it raises the plate K to set the pins h<2> inside the flanges, and on returning the slide G the links h<1> are lowered and then the levers h are restored by the bar R to bring the pins h<2> beneath the numeral wheels again. After transferring tens, the setting- bars r are returned to zero position by a bar q, Fig. 14, which engages with the lower parts of their knobs S, Fig. 1, the bar q being moved backwards and forwards by means of a lever q<1> acted upon by the knob A. The counter is zeroized by the known action of a bar on cams provided on the spindles of the numeral wheels, and the latter are normally locked by teeth on a sliding bar engaging with the teeth on the wheels e. This locking-bar is provided with wedges C<1>, C<2>, Fig. 14, with which a pin H<1> on the wedge H engages when the latter is pushed upwards, to move the locking-bar and so release the numeral wheels. When the zeroizing-bar is operated by means of the knob k, Fig. 15, the locking-bar is moved with it to free the numeral wheels. The device for re-setting the bars r in repeated addition and subtraction consists of a carriage U provided with guides U<1>, U<2>, Fig. 15, to enable it to be pushed on rails towards the back of the machine, slides s<1>-s<8> being adjustably connected by pawls and ratchet teeth to the carriage. A number is set up on the carriage U by drawing out the slides through distances proportional to the digits. and the number set up is indicated in the apertures y<1>. On drawing down the carriage, the ends of the slides s<1>-s<8> contact with the knobs S of the setting-bars r and re-set the number in the machine. A latch U<3> on the carriage can be sprung into different notches in the frame of the machine to set the carriage in different transverse positions for increasing the added number ten-fold, hundredfold, &c. in multiplication and division. The number set up on the carriage is cleared by turning a lever X' when a bar is moved to release the springs of the retaining-pawls of the slides.