A mechanical timer is an ordinary mechanical clock, which is now used in kitchens made in various shapes, is a mechanical timer. Buy one, take it apart and understand. The internal structure consists of three main parts:
The first part is the power components, by the clockwork, winding the one-way mechanism, so that when the manual twist, only tighten, not loose. Tightening the clockwork provides the power of the entire system.
The second part is the release component. It consists of a series of gears shifted to increase the number of rotational cycles when the clockwork is relaxed. At the end of the gear train there are escapement wheels, escapement jaws and a hairspring to ensure that the gear train rotates at a constant speed driven by the clockwork. The hairspring has a device to adjust the length of the hairspring to adjust the frequency of the escapement claw swing to ensure that the gears rotate at the set speed without loosening the winding that has been tightened all at once and is not affected by the change in speed due to the loosening or tightening of the winding.
The third part is a timing trigger device that makes an electrical or mechanical signal to stop the power supply or sound a bell after a gear in the gear train has turned at a certain angle.
The three parts work together is that screwing the timer to a certain scale actually does two things, one is to tighten the clockwork to provide power to make the timer start working, and the other thing is that the scale screwed is the one that sets the trigger position of the trigger mechanism.
Then the whole structure, under the control of the escapement wheel, slowly releases the power of the barrel and the gears at all levels begin to rotate at a constant speed until the trigger mechanism moves.
