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Most japanese leaf shutters are rather clones of the Prontor shutters than of the Compur shutters. The main difference is that on Prontor-design shutters there is a spring-loaded crank attached to the cocking shaft which pushes the actuator ring of the blades forward and backward. This cocking shaft also interferes (more or less depending on speed setting) with a lever protruding from the speed escapement. On Compur shutters, even on the later ones with a cocking shaft and a wound spring instead of a tension spring, there is an intermediate ring (driven by the tension spring or by a gear on the cocking shaft) of which a tab runs across the speed escapement. For repairs on Prontor-design shutters you can refer to instructions concerning Copal shutters. They are all very similar. You will find quite a few hints on www.daniel.mitchell.name |