Electromagnet

Type of magnet whose activation depends on the magnetic field produced by the flow of electric current through a coil of wire surrounding a magnetic core (es.wikipedia.org, s.f.).

Cam-follower

Mechanical set that transforms a circular movement to a translational one. For this, it has some auxiliary elements (spring, follower, axis) with different typologies according to the purpose of its use (es.wikipedia.org, s.f.).

Rod-Crank mechanism

Mechanism that executes the change from a circular movement to a rectilinear one or vice versa, being the rod the rigid element that connects articulately the crank and the plunger, and the crank the element that rotates (es.wikipedia.org, s.f.).

Worm screw

Threaded element that engages irreversibly with a gear wheel, used to transfer power between intersecting axes, usually perpendicular ones. The speed of rotation will depend on the number of screw inputs, which allows a great reduction of speeds (www.ecured.cu, 2019).

Rack and pinion

Gadget, which works reversibly, that transforms a rotating movement into a rectilinear one. The rack moves back and forth when the axis in which the pinion enganges is rotated, having both elements the same module (www.edu.xunta.es, s.f.).

Pneumatics/Hydraulics

Physical principles that transmit energy through fluids. (www.areatecnologia.com, s.f.).

Crank-cylinder mechanism

Mechanism that operates the music boxes. Its operation is simple: when turning the crank that is threaded like a worm screw, it contacts the crown carved on the cylinder, rotating it ("miium", 2016).

References:

https://es.wikipedia.org/wiki/Electroim%C3%A1n

https://es.wikipedia.org/wiki/Leva_(mec%C3%A1nica)

https://es.wikipedia.org/wiki/Biela-manivela

https://www.ecured.cu/Tornillo_sin_fin

https://www.edu.xunta.es/espazoAbalar/sites/espazoAbalar/files/datos/1464947673/contido/51_pincremallera.htmhttps://www.areatecnologia.com/NEUMATICA.htm

https://www.cajasmusicales.com/como-funciona-cajita-musica-mecanismo-cilindro