LORENZE FURTWANGFLER and SHONE:
The initials on the back of this mechanism are l w s inscribed in a circle on
the back of the mechanism. This is a westminster chime mechanism with some
unusual sequencing levers. The drive gear shaft through the front plate serving also
as the clutch is not so unusual. The trip lever is attached to the front plate on a post
and held on position by a coil spring attached directly above it. The lock and warning
lever are held in place by a coil spring also. The trip lever and the lock / warning lever
works with the trip lever to keep it in place. If the hands get forced ahead one of the
places that are affected is point a. It will get bent too far to the right and then the
lift pins on the minute wheel will not be able to lift the lock/warning lever far enough
to release the warning pin in the chime gear train. Pay close attention to the roller:
it should move freely and when it drops into the shutoff areas it should do so almost
immediately and at the same time the gear train should shut off.The roller is attached
to a plate that is fastened with screws to the trip/lock lever: this allows for adjustment
of the position of the roller as far as up and down is concerned (the holes in the
roller plate are slotted) . When the gear train starts moving for the next chime sequence;
be sure that the shutoff pin on the wheel does not catch the lock lever on the second
time around.This will happen if the position of the roller is set too close to the next
lobe on the sequence cam. The trip lever will hang up if the trip pin and the working
face of the lock/warning lever gets worn. The mechanism that I worked on had
that problem. the chime would trip but the lever would hang up. the working
face at B had a groove worn in it and the trip pin had a flat spot in it. The trip pin
can be twisted so a new working face can be utilized and face b can be filed and
polished. If the pin can’t be turned, it will have to be replaced if the mechanism
will not work. the self correct pin does its job by moving the trip lever into position so
the front pin can reach the front partition of the trip lever. It works on the high lift
principal, its just that the lever A pushes the trip cam back farther back when the
lock /warning lever drops into the deeper area on the ¾ hour position.