Drawing exercise teaching machine - has covered matrix of electrical contact sensors for working surface with outputs evaluated in comparison process

摘要

A teaching machine for drawing exercises utilises a working surface that has a covered matrix of electrical contact sensors that generate outputs for evaluation in a comparison process. The metallic contacts (2) are located in a matrix within an insulating plate (1). The heads of the contacts are in contact with the underside of a punched card (8) with a hole pattern corresponding to the key features of the exercise. - The surface of the card is bonded to a metal foil (10) and the drawing paper (7) laid on top. When the student produces the drawing, the pencil causes the foil to touch the contact beneath a punched card hole and a signal is transmitted