Sound reproducing device with closing contact - has pair of feeler pins which close at specific height relation

摘要

A sound reproduction device has a closing contact in the reproduction appliance and the relation in height between the closing contact and the tripping and feeler pins is such that closing contact is only closed when the feeler tip is above the setting up plane of the reproduction appliance. The closing contact is shut when the feeler pin is raised by encounter with a hump on the sound carrying strip. Holes are also provided in the sound strip and the contact is only closed when the two feeler pins are in specific raised and lowered positions.