H.Weiland
10-30-2007, 08:33 PM
I have just completed rebuilding from parts a Model "D" wieght driven ITR master clock. Presently I am having trouble with the control for the hoist motor that rewinds the weights.
Behind the weight cable drum is a fan gear, that is constructed similarly to a geneva stop works. As the cable drum turns powering the clock, a pin eventually on the back of the cable drum moves the fan gear which operates a pitman (or link) arm which is susposed to trip the toggle of the motor switch. This it very, very nearly does, but not quite. The slightest touch will cause the switch to operate when it is in the correct position, but will not throw over by itself.
The vertical pitman arm has a off center screw in it, which my guess is to adjust the operating point of the switch. I have tried different positions for the screw but as yet it has not helped.
Does any one have suggestions? This is the very old style movement, if that is of any help.
Thanks!
Henry Weiland
Behind the weight cable drum is a fan gear, that is constructed similarly to a geneva stop works. As the cable drum turns powering the clock, a pin eventually on the back of the cable drum moves the fan gear which operates a pitman (or link) arm which is susposed to trip the toggle of the motor switch. This it very, very nearly does, but not quite. The slightest touch will cause the switch to operate when it is in the correct position, but will not throw over by itself.
The vertical pitman arm has a off center screw in it, which my guess is to adjust the operating point of the switch. I have tried different positions for the screw but as yet it has not helped.
Does any one have suggestions? This is the very old style movement, if that is of any help.
Thanks!
Henry Weiland