Schmidttype

Schmidttype refers to a class of mechanical watches that employ a specific type of cam mechanism for their operation. This mechanism is primarily used in the context of chronographs, enabling the precise and smooth activation of various functions like starting, stopping, and resetting the stopwatch. The key characteristic of a Schmidttype chronograph is its use of a set of shaped cams that are actuated by levers and pushers.

Invented by Fritz Richard in the early 20th century, the Schmidttype system offers an alternative to the more common column wheel mechanism for controlling chronograph functions. Instead of a rotating column wheel, the Schmidttype utilizes levers that engage with precisely shaped cams. These cams are designed with specific profiles that dictate the movement and engagement of the chronograph's wheels and levers.

The operation involves pushing buttons that, in turn, manipulate these levers. The levers then interact with the Schmidttype cams, causing them to rotate or shift, thereby engaging or disengaging the chronograph's wheels. This system is known for its reliability and relatively straightforward construction compared to some other chronograph mechanisms. While less prevalent than column wheels in high-end watchmaking today, Schmidttype chronographs can still be found in vintage and some contemporary timepieces, appreciated for their robust engineering and distinct operational feel.