Electricity: electrical systems and devices – Control circuits for electromagnetic devices – For relays or solenoids
Patent
1977-03-28
1978-10-10
Moose, Jr., Harry E.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
For relays or solenoids
68 12R, 361236, D06F 3742
Patent
active
041200136
ABSTRACT:
A control system for a laundry machine generates a control signal to operate a door lock unit and prevent the door from opening while the laundry machine cylinder is rotating. A permanent magnet is mounted adjacent to the drive wheel of the cylinder so that the wheel spokes cut through the magnetic field of the magnet. A pick-up coil is mounted coaxial with the magnet and generates an induced pulse signal as the wheel turns. The induced pulse signal is processed by circuitry mounted on a printed circuit board to generate a DC control signal for the door unlocking circuitry of the door lock unit. The pulse signal is rectified and smoothed to provide a DC signal and is processed by a timer circuit to provide an amplified, precise switching signal which is used as the control signal. The DC control signal operates an electronic switch which connects an AC power source across a relay coil to open the door unlocking circuit so that the door remains locked as long as the DC control signal is generated. A separate extract circuit is simultaneously closed by the relay so that the extract unit can be actuated by the drum timer during the washing cycle only when a control signal is generated. If the control system malfunctions, the machine cannot switch into its high-speed extract cycle. A capacitor maintains the DC control signal at the input of the electronic switch for a predetermined period of time after the induced voltage has stopped to keep the door locked until the rotating cylinder has come to a complete stop.
REFERENCES:
patent: 3328983 (1967-07-01), Brucken et al.
Ametek Inc.
Moose Jr. Harry E.
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