The mechanism of the Addimult Ziffrex

In this video I’ll show you the mechanism of the Addimult Ziffrex. These input levers are connected to these toothed segments, and those are connected to the main register through an intermediate gear, so when you move the lever the gear moves in the same direction. If I press this input clearing button, the whole section of input leavers moves backwards releasing them from the rest of the mechanism and allowing them to be returned to the beginning through a spring. This input display register at the front is connected to the input levers through metal wires. The carry mechanism of the main register, those are handled by the intermediate gears.

01:04 - Each intermediate gear has an extra arm that triggers the next digit to move one step each time that its own wheel passes 9. Here’s the clearing lever. It uses this bar at the front. These gears have one tooth missing so that in the normal rest position it’s disconnected but when you turn the clearing knob it moves and all the numbers are returned to zero. The most interesting part is what happens when you switch to subtraction. In this, this mechanism looks a bit like the Resulta, and what happens is that the main register moves back up towards the toothed segments, and the intermediate gears move out of the way. so in this configuration the input levers directly drive the main register without the use of that intermediate gear and this causes them to move in the opposite direction.

02:53 - So that was the mechanism of the Addimult Ziffrex. Thank you for watching! .