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Electromagnetic vibrators are widely used in feeders for loose materials, weighing machines, small-and medium-size vibration conveyors, small-capacity vibration pumps, and other equipment. This is the result of their advantages over other types of vibrators, including simplicity in design and use, high reliability and life, the possibility of stepless regulation of the amplitude of oscillations, and practically noise-free operation [i, 2].

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has developed an introduced a signaling device with programmed control for existing automatic stackers, which may be used on similar equipment.The signaling device with programmed control consists of a nonmetallic (e.g., Textolite) disk i with grooves, into which are placed sealed-contact reed relays 2, position switches or pointers 3 with permanent magnet 4 on the end located on ratchet wheel 5, pneumatic chamber 6, panel 7 withcontactless limit switches 8, the relay block, and the switching connections.