Well, never had one apart, but it has got to be a slug of soft iron which gets pulled into a magnetic circuit with a coil of wire wrapped around it. The coil will be connected to the mains, and provide magnetic attraction at twice mains frequency.
A spring will set its return location.
Hi everybody! i want and need to know how works an electric engraver, > or to be more objetive, i need to know its internal system, what > generate de mechanical vibration... any answer or link with that topic > will be appreciated! > Here is a link with the device to you make an idea what device i'm > talking about >