Closeup of the mechanisms on the right side of the machine.
Most of this paraphernalia is concerned with moving the two parts which
do the actual folding, the depressor which holds the paper down,
and the flapjack which comes up from underneath to fold it back
over on itself. A Dick Smith 3-12V electric motor drives a 57t gear via
a worm and 1" pulley. The brass protrusion on this side of the gear forms
a cam lobe which raises the depressor via the lever above. Another cam
lobe on the other side of the gear (not visible from here) raises the lever
attached to the other 57t gear, which rotates the shaft (the one with the
red dot on the end (don't ask how it got there)), raising the flapjack
like this. Microswitches are
mounted above the mechanism to sense its position.
Also visible in this view are the two 25t pinions which drive the top
pressure roller from the bottom one (by sheer luck the diameter of the
rollers came out to be just right for them to mesh!). You can also see
the extra roller at the bottom right which deposits the paper in the output
tray underneath. This is also driven from the bottom pressure roller, via
two 19t pinions and two universal gears, which looks really clumsy but
it was the best I could do with the parts I had left...
