Programmer/timer for appliances

Details Programmer/timer for appliances Programmer/timer for appliances

1982-04-15

1986-03-18

Caldwell, Sr., John W.

Communications: electrical

Systems

Timer control

200 38R, 200 35R, 200 39R, G08B 100, H01H 708

Patent

active

045771790

ABSTRACT:
A programmer timer (10) having motor driven cams (61, 64, 62, 66) for operating electrical switching mechanisms (102, 116, 144, 138, 126). The motor comprises a pair of spaced stator plates (24, 26) with a coil (34) and permanent magnet rotor (36) therebetween, received in a walled chamber (28) in the timer housing. Motor reduction gears (44) drive a shaft (48) for driving the ratchet wheels (72, 68) and rotary cams. The motor, gear train cams and electrical switching mechanisms are contained in a single integral housing (12). Separate concentric fast and slow ratchet wheels (72, 68) are driven by a single eccentric driven pawl (14). The center of rotation of the eccentric is positioned so that drive pawl contacts the ratchet wheel at an angle at least 10.degree. greater than a tangent at the contact point, for all eccentric positions, to provide ratchet wheel advance in the event of reverse rotation of the eccentric. A bifurcated anti-reverse pawl (84) is biased against the fast and slow ratchet wheels by a spring arm (88) integral therewith. The center of rotation of the eccentric is spaced from the fast and slow ratchet wheel centers and optionally has a subinterval cam (148) provided thereon for affecting switching. The anti-reverse pawl may optionally be pivoted about the center of rotation of the drive eccentric. The motor stator plates optionally include integrally therewith a striker arm (178, 180) and anvil (176) for cam controlled operation of a buzzer. The ratchet drive pawl alternatively is biased by a spring arm (154) formed integrally therewith. The ratchet wheel may also optionally employ wiper contacts (200) for contacting a stationary printed circuit board.

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