Programmable time switch
AssigneeDanfoss A/S
InventorsAksel Jespersen, Peter A. Eriksen
Life of this patent
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Abstract
The invention relates to a time switch assembly of the type having an electric stepping motor, a pulse generator and a connecting drive therebetween for driving the motor at speeds corresponding to the frequency of the pulse generator. A time plate is driven by the motor and a scanning switching circuit is responsive to different speeds of the time plate. First and second counters in series are provided between the pulse generator and the motor. A switching device between the counters provides selectable bypassing of the second counter so that the motor may be driven at a speed corresponding to the output of only the first counter or at a slower speed corresponding to a slower counter output of the two counters operating in series.
Claims1
A time switch assembly, comprising, an electric stepping motor, a pulse generator, drive means for driving said motor at predetermined selected speeds corresponding to the frequency of said pulse generator, means providing single speed gearing between said motor and said time plate means, said drive means including a fixed frequency oscillator and first and second counters in series, said first counter being matched to said oscillator to have an output frequency related specifically to said speed gearing, said second counter having a divide by seven factor, and switching means between said counters to provide selectable bypassing of said second counter wherein said first counter acting alone drives said time plate through said single speed gearing at one revolution per day and said counters acting together drive said plate at one revolution per week.
Dependencies are inferred from the claim text.