I have to deal with a situation where I have two parallel and completely independent rods whose motion is dependent only on external inputs, and I want to add up the lengths traveled by each rod.
My first thought was to use two rack-and-pinion mechanisms by which I move two gears, one by each rod, and then couple them to a single rack. But this is not going to work since the rack when moved by one gear, will cause the other to move as well.
This seems to be an easy thing to do on a macro scale but I wish to 3D print this mechanism and they are going to be very small, so I expect to build a very simple mechanism.
- When Rod A and Rod B are at A0 and B0 respectively, I want Rod Y to be at Y0
- When either Rod A or Rod B is at state 1 and the other at state 0, I want Rod Y to be at Y1
- When Rod A and Rod B are at A1 and B1 respectively, I want Rod Y to be at Y1
Rods A and B should be absolutely independent of each other. And the gap between the lower face of Rod A and the upper face of Rod B should be around 35 mm, with all rods being about 3 mm wide. How can this be solved?