So I'm sharing this tricksy little blighter I found in a vendor, because the same little so and so appears in many different machines and a year or so ago we had a lengthy thread concerning releasing the ratchet on a bandit's handle.
I recently bought a very nice vendor. You may have seen it recently on Ee-BygumBay.
It's complete and works fine, I want to spruce up the paintwork, so dismantled it. The drawer withdrew ok but needed a bit of a shove to go back in again.
This is The Draw Assembly The gubbins underneath the drawer was smothered (as usual) in dry grease, so a good dunking in solvent was called for. Basically it's a drawer that slides out without being able to reverse its action until it has traveled the full length, and then on the return journey, again it has to go the full way until another coin can enter. It's the same mechanism that you'll find on a bandit handle or some Allwin payouts. The Pawl (part that clicks over the teeth of the ratchet) has to pass to the end of the row of teeth in order to reverse so it can return.
Clever Stuff Underneath Because the Pawl and row of Ratchet teeth are hidden behind other parts I've outlined them.
Pawl and Ratchet When the drawer was extracted and ready to reverse I spotted that the front of The Pawl was jamming against the the peak of the first tooth instead of the valley. Hence it would jam. This was what was making sliding it back troublesome. It would be easy to guess it was worn, however examination showed it was like new. Further squinting revealed that the gap the drawer traveled in allowed for about ten thou of sideways movement. Which in turn pivots the axle the Pawl rotates on so that it skews a tiny amount and results in the leading edge hitting the first tooth instead of meshing with it. What to do? By adding a brass shim on the opposite corner it straightened it up.
Brass Shim being placed. Shim Secured The body of The Vendor sports a lovely large 3d plaque, which I removed in order to repaint.
3d Plaque I wire brushed it and intend to take a mould from it so I can cast some up, I'll let you know how that goes. I can't see me firing up my gas furnace in this weather though.
Clean and against a thruppeny for comparison. BP