Program modification circuit for electronic appliance programmer

Details Program modification circuit for electronic appliance programmer Program modification circuit for electronic appliance programmer

1976-12-09

1978-08-01

Schaefer, Robert K.

Electrical transmission or interconnection systems

Switching systems

Switch actuation

3071414, 328130, H01H 700, H01H 4300

Patent

active

041045424

ABSTRACT:
An appliance programmer, in particular an automatic washer programmer, employs a memory circuit and a sequence control for establishing a predetermined program. Included in the program are a program modification circuit and a rapid advance circuit whose functions are respectively to automatically modify the program inherent in the programmer and to rapidly step the programmer through its operational program. The memory and sequence control of the programmer are designed so that, absent the program modification circuit, the programmer can effect only a single predetermined program. For this reason the program modification circuit has been designed to enable the programmer to effect other programs. The program modification circuit receives inputs from selected function display lights to indicate that a certain function is being performed and from one or more sensors to indicate that a function has been completed or a condition has been satisfied in the automatic washer. The program modification circuit then causes several of the frequency dividers in the frequency divider chain of a clock forming part of the programmer to be bypassed. This results in the shortening of the next predetermined time period which the clock is programmed to establish. Therefore, the operation which is then being performed is shortened in duration so that the function appears to be curtailed thus causing a modification of the predetermined program. In addition, the rapid advance which is provided allows for manually speeding up the functions of the programmer by stepping the programmer through its sequence of operations at a much faster rate than normal. This also allows the programmer to be tested rapidly for ease in servicing.

REFERENCES:
patent: 3774056 (1973-11-01), Sample et al.
patent: 3829784 (1974-08-01), Eshraghian
patent: 3986040 (1976-10-01), Karklys

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