Hello friends! I need some help. I'm restoring a nice Copal T-11 but can't get the alarm to work properly. Electrically it all works fine but the problem is mechanical. At the set time there is the expected click but the lever that should engage the micro switch does not move.
In order to investigate I have taken it largely apart but I still can't figure out how it should work.
At the left there is the alarm wheel with a little insert (A) that is held in place by a screw. As I understand it, the insert should run between the white wheel B and black wheel C. Between A and B is a spring pushing the two apart. Inside wheel B and C (not visible from the outside) there is a spring pulling these two together. When the insert is between B and C it pushes them apart. At the set time it reaches a sharp drop-off and this allows B and C to move together again. I expected this to also allow lever D to move to the left and release the lever on the micro-switch E (buzzer is on when the switch is not pressed). But since the spring between A and B is way stronger than the internal spring in the micro-switch this does not happen and the micro-switch stays pressed.
Anybody any idea? Am I missing a part? (Seems quite unlikely since the screws still had that loctite-like stuff on them).
I could imagine it could work if there was a spacer between B and the hour wheel but there isn't any.
Another question is how to adjust the timing of the alarm? At the moment it fires about 5 minutes before the set time. I can't see to a way to change this apart from repositioning all the hour tiles.
In order to investigate I have taken it largely apart but I still can't figure out how it should work.
At the left there is the alarm wheel with a little insert (A) that is held in place by a screw. As I understand it, the insert should run between the white wheel B and black wheel C. Between A and B is a spring pushing the two apart. Inside wheel B and C (not visible from the outside) there is a spring pulling these two together. When the insert is between B and C it pushes them apart. At the set time it reaches a sharp drop-off and this allows B and C to move together again. I expected this to also allow lever D to move to the left and release the lever on the micro-switch E (buzzer is on when the switch is not pressed). But since the spring between A and B is way stronger than the internal spring in the micro-switch this does not happen and the micro-switch stays pressed.
Anybody any idea? Am I missing a part? (Seems quite unlikely since the screws still had that loctite-like stuff on them).
I could imagine it could work if there was a spacer between B and the hour wheel but there isn't any.
Another question is how to adjust the timing of the alarm? At the moment it fires about 5 minutes before the set time. I can't see to a way to change this apart from repositioning all the hour tiles.
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