Patent EP0073324A2 successfully refreshed from Google Patents.
EP0073324A2
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EP
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Copier fuser control apparatus and method
Assignee: International Business Machines Corp
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Filing: 1982-07-13
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Granted: —
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Expires: 2002-07-13
Abstract
Abstract During each copier warm-up period, a micro processor 40, D/A 41 and network 53 apply a signal of decreasing steps to a comparator 52, which also receives an input from a fuser temperature sensor 50. When the sensor signal exceeds the step signal, the control logic for the copier is enabled since the fuser temperature profile is set at an adequate level for proper fusing.
Inventors
- 👤 John Harold Dodge
- 👤 Larry Mason Ernst
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 07:25
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/20; G03G15/2003; G03G15/2014; G03G15/2039; G03G15/205
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
72 words
A fuser control system for a xerographic copier including controlled switch means (42) for coupling power to a fuser heater and sensor (50) for sensing the fuser temperature characterised by control means (40, 41, 53) producing a signal sequence of declining magnitude over a first period subsequent to switching on the copier and comparing means (52) responsive to the signal sequence and the output of the sensor to control said switch means.
Claim 2
Dependent Claim
72 words
A fuser control system for a xerographic copier including controlled switch means (42) for coupling power to a fuser heater and sensor (50) for sensing the fuser temperature characterised by control means (40, 41, 53) producing a signal sequence of declining magnitude over a first period subsequent to switching on the copier and comparing means (52) responsive to the signal sequence and the output of the sensor to control said switch means.
Claim 3
Dependent Claim
27 words
A system as claimed in claim 1 further characterised in that said switch means is closed until opened in response to an output from the comparing means.
Claim 4
Dependent Claim
27 words
A system as claimed in claim I or claim 2 further characterised in that said signal sequence comprises a sequence of stepped signals each of predetermined duration.
Claim 5
Independent Claim
67 words
A method of controlling a fuser in a xerographic copier having switch means for coupling the fuser to a source of power and a sensor for sensing fuser temperature, characterised by the steps of generating a signal of declining magnitude over a period subsequent to switching on the copier, comparing the declining signal with the sensor output and controlling said switch means in response to the comparison.
Claim 6
Independent Claim
67 words
A method of controlling a fuser in a xerographic copier having switch means for coupling the fuser to a source of power and a sensor for sensing fuser temperature, characterised by the steps of generating a signal of declining magnitude over a period subsequent to switching on the copier, comparing the declining signal with the sensor output and controlling said switch means in response to the comparison.
Claim 7
Dependent Claim
44 words
A method as claimed in claim 4, further characterised by the step of indicating a machine failure if the sensor output does not reach the magnitude reached by the declining signal at the end of said period during a second period following said period.
Claim 8
Dependent Claim
23 words
A method as claimed in claim 4 or claim 5 further characterised in that said declining signal comprises a sequence of signal steps.
Claim 9
Independent Claim
56 words
A method as claimed in any of claims 4 to 6 further characterised in that said switch means is controlled to deliver full power to the fuser print whilst the declining signal is greater than the sensor outpu. and is therafter controlled to deliver reduced power to the fuser until the sensor indicates a predetermined temperature.
References Cited (Backward Citations)
No citation records indexed.
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