Circuit for controlling temperature of a fuser unit in a laser printer
First Claim
1. A temperature control circuit of an image forming apparatus, comprising:
- converting means for generating a temperature dependent voltage indicative of a sensed temperature of a fusing device, said fusing device for fusing toner to paper by application of heat;
determining means for generating one of a first reference voltage signal corresponding to a predetermined operational temperature of said fusing device, a second reference voltage signal corresponding to a predetermined standby temperature of said fusing device and a third reference voltage signal indicative of a selection of a disabled state of said temperature dependent voltage to the generated one of said first reference voltage signal and said second reference voltage signal and disabling generation of said control signal in response to said third reference voltage signal for any state of said temperature dependent voltage, said control signal for enabling a heating device to heat said fuser device.
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Accused Products
Abstract
A system for controlling temperature of a fuser unit in an laser printing device, without central processor control, includes a converting circuit for generating a temperature dependent voltage indicative of a sensed temperature of a fusing unit, a determining circuit for generating one of a first reference voltage signal corresponding to a predetermined operational temperature of the fusing device and a second reference voltage signal corresponding to a predetermined standby temperature of the fusing device; and a control signal circuit for generating a control signal in response to comparisons of the temperature dependent voltage to the generated one of the first reference voltage signal and the second reference voltage signal, the control signal for enabling a heating device to heat the fuser unit.
27 Citations
20 Claims
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1. A temperature control circuit of an image forming apparatus, comprising:
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converting means for generating a temperature dependent voltage indicative of a sensed temperature of a fusing device, said fusing device for fusing toner to paper by application of heat; determining means for generating one of a first reference voltage signal corresponding to a predetermined operational temperature of said fusing device, a second reference voltage signal corresponding to a predetermined standby temperature of said fusing device and a third reference voltage signal indicative of a selection of a disabled state of said temperature dependent voltage to the generated one of said first reference voltage signal and said second reference voltage signal and disabling generation of said control signal in response to said third reference voltage signal for any state of said temperature dependent voltage, said control signal for enabling a heating device to heat said fuser device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A temperature control circuit for fusing rollers of an electrostatic printing device, said fusing rollers for fusing toner to paper, said circuit comprising:
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converting means for generating a temperature dependent voltage indicative of a sensed temperature of fusing rollers; determining means for generating one of a first reference voltage signal corresponding to a predetermined operational temperature of said fusing rollers, a second reference voltage signal corresponding to a predetermined standby temperature of said fusing rollers and a third reference voltage signal indicative of a selection of a disabled state of said heating means; means for generating a control signal in response to comparisons of said temperature dependent voltage to the generated one of said first reference voltage signal and said second reference voltage signal and disabling generation of said control signal in response to said third reference voltage signal for any state of said temperature dependent voltage; heating means for heating said fusing rollers; and driving means for driving said heating means in response to said control signal. - View Dependent Claims (13, 14, 15, 16, 17)
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18. A temperature control circuit for fusing rollers of an electrostatic printing device, said fusing rollers for fusing toner to paper, comprising:
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converting means for generating a temperature dependent voltage indicative of a sensed temperature of fusing rollers; determining means for generating one of a first reference voltage signal corresponding to a predetermined operational temperature of said fusing rollers, a second reference voltage signal corresponding to a predetermined standby temperature of said fusing rollers and a third reference voltage signal indicative of a selection of a disabled state of said heating means; means for generating a control signal in response to comparisons of said temperature dependent voltage to the generated one of said first reference voltage signal and said second reference voltage signal and disabling generation of said control signal in response to said third reference voltage signal for any state of said temperature dependent voltage; heating means for heating said fusing rollers; and driving means for driving said heating means in response to said control signal. - View Dependent Claims (19, 20)
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Specification