Abstract A drying control system in automatic dryers involves the use of two thermostats with a timer and heating element, the thermostats being positioned in the exhaust airstream emanating from the drying chamber. The first thermostat is set for a lower temperature range than the second thermostat and both thermostats provide for operation of the heating element until the temperature has risen to a predetermined level, after which the thermostat set in the lower temperature range will switch to bring the timer into the circuit. The heating element continues to draw current through the thermostat set in the higher range but when the temperature reaches the upper level at which the higher range thermostat is set, the latter will open to switch off the heating element. Sequentially, the second thermostat will then cycle on and off until the total time of the timer has expired.
A fabric drying machine comprising: a. a fabric container having an air inlet opening communicating with the atmosphere; b. exhaust passage means leading from said container; c. means for circulating air through a said container; d. electrically activated heating means for heating air passing into and through said container; e. a first and second thermostatically controlled switch located in said exhaust passage means; f. said first switch being set to operate at a lower temperature range than said second switch, with both connected in series to said heating means in the range of temperature for said first switch, with both switches connected in parallel; g. a timer motor; h. and said first switch being switched from said heating means to series connection with said timer motor when the temperature in said exhaust passage means reaches the upper limit of the range in which said first switch is set to operate and said second switch cycling said heating means within the range in which said second switch is set.
Claim 2
Dependent Claim
168 words
A fabric drying machine comprising: a. a fabric container having an air inlet opening communicating with the atmosphere; b. exhaust passage means leading from said container; c. means for circulating air through a said container; d. electrically activated heating means for heating air passing into and through said container; e. a first and second thermostatically controlled switch located in said exhaust passage means; f. said first switch being set to operate at a lower temperature range than said second switch, with both connected in series to said heating means in the range of temperature for said first switch, with both switches connected in parallel; g. a timer motor; h. and said first switch being switched from said heating means to series connection with said timer motor when the temperature in said exhaust passage means reaches the upper limit of the range in which said first switch is set to operate and said second switch cycling said heating means within the range in which said second switch is set.