US4372675A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable power fuser control
Assignee: Xerox Corp
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Filing: 1980-11-28
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Granted: 1983-02-08
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Expires: 2000-11-28
Abstract
Abstract The present invention is a machine control having a programmable non-volatile memory and microprocessor to control power to a fuser lamp in a manner to adapt the machine to distinct power outlets. The non-volatile memory is programmed to indicate the availability of a particular power output. The control monitors the memory and in turn gates a triac controlling the fuser lamp to apply the maximum possible power to the fuser. If the machine is operating at a 3.0 of a 2.2 kva outlet, full power could not be delivered to the fuser while the machine is operating. The machine would adapt to operate at reduced power to the fuser until the fuser temperature drops below a minimum temperature level.
Inventors
- 👤 Ravi B. Sahay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:50
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/20; G03G15/2003
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
165 words
In a reproduction machine for producing impressions of an original, the reproduction machine having a photosensitive member, a plurality of discrete operating components cooperable with one another and the photosensitive member to electrostatically produce the impression upon support material, one of the discrete operating components being a fuser having a fuser lamp, and a controller including a memory, the method of operating the machine at a variety of distinct power outlets comprising the steps of: setting the memory to manifest a given power availability, scanning the memory to determine the power available for the machine, responsive to the manifestation of the power available, selectively gating the fuser lamp to apply power to the fuser in accordance with the available power; monitoring the temperature of the fuser; holding the machine components other than the fuser at standby upon detecting the fuser temperature below a first predetermined level; and operating the machine components at normal operation upon detecting that the fuser temperature at a second predetermined level.
Claim 2
Dependent Claim
165 words
In a reproduction machine for producing impressions of an original, the reproduction machine having a photosensitive member, a plurality of discrete operating components cooperable with one another and the photosensitive member to electrostatically produce the impression upon support material, one of the discrete operating components being a fuser having a fuser lamp, and a controller including a memory, the method of operating the machine at a variety of distinct power outlets comprising the steps of: setting the memory to manifest a given power availability, scanning the memory to determine the power available for the machine, responsive to the manifestation of the power available, selectively gating the fuser lamp to apply power to the fuser in accordance with the available power; monitoring the temperature of the fuser; holding the machine components other than the fuser at standby upon detecting the fuser temperature below a first predetermined level; and operating the machine components at normal operation upon detecting that the fuser temperature at a second predetermined level.
Claim 3
Dependent Claim
74 words
A method of claim 1 including the steps of providing a first level power to operate the components of the reproduction machine other than the fuser to produce copies and providing a second level of power to the fuser to operate the fuser during operation of the other machine components, and inhibiting the machine from producing copies when the heat power delivered by the fuser to copies is insufficient to produce acceptable fused copies.
Claim 4
Dependent Claim
26 words
The method of operating the machine of claim 1 including the step of operating the fuser from stored heat energy while the machine is producing copies.
Claim 5
Independent Claim
152 words
The method of operating a reproduction machine having a fuser for fixing images produced on copies and having other operating components including the steps of determining the power available to the reproduction machine, providing a first power level to operate said other operating components, providing a residue power level, the residue power level being the difference in power between the available power and the power to operate the other operating components, to operate the fuser; operating the other operating components and the fuser until the fuser temperature drops below a first temperature level, inhibiting operations of the other operating components upon detecting the fuser below said first temperature level, providing the first power level and residue power level to the fuser to raise the fuser temperature to a second level above said first level, resuming operation of the other operating components to produce copies upon the fuser temperature reaching the second level.
Claim 6
Independent Claim
152 words
The method of operating a reproduction machine having a fuser for fixing images produced on copies and having other operating components including the steps of determining the power available to the reproduction machine, providing a first power level to operate said other operating components, providing a residue power level, the residue power level being the difference in power between the available power and the power to operate the other operating components, to operate the fuser; operating the other operating components and the fuser until the fuser temperature drops below a first temperature level, inhibiting operations of the other operating components upon detecting the fuser below said first temperature level, providing the first power level and residue power level to the fuser to raise the fuser temperature to a second level above said first level, resuming operation of the other operating components to produce copies upon the fuser temperature reaching the second level.
Claim 7
Dependent Claim
36 words
The method of claim 4 wherein the step of operating the fuser at the residue power level includes the step of operating the fuser with stored heat energy until the fuser drops below a predetermined level.
Claim 8
Independent Claim
94 words
The method of operating a reproduction machine having a control with memory, a fuser for fixing images produced on copies, and other operating components including the steps of setting a power available indication in the memory for a particular power environment, detecting the power available indication during machine power up, providing a first power level to operate said other operating components, providing a residue power level to operate the fuser, the residue power level being the difference in power between the indicated available power and the power required to operate the other operating components.
Claim 9
Independent Claim
94 words
The method of operating a reproduction machine having a control with memory, a fuser for fixing images produced on copies, and other operating components including the steps of setting a power available indication in the memory for a particular power environment, detecting the power available indication during machine power up, providing a first power level to operate said other operating components, providing a residue power level to operate the fuser, the residue power level being the difference in power between the indicated available power and the power required to operate the other operating components.
Claim 10
Dependent Claim
32 words
The method of claim 6 wherein the step of determining the power available to the reproduction machine includes the step of monitoring the control memory for the indication of the power available.
Claim 11
Dependent Claim
39 words
The method of claim 7 wherein the memory is a non-volatile memory and the step of setting the power availability indication includes the step of programming the non-volatile memory with a code word corresponding to a particular power availability.
Claim 12
Dependent Claim
62 words
The method of claim 6 including the steps of, determining that the fuser temperature has dropped below a minimum level, inhibiting the other operating components from producing copies in response to the temperature dropping below the minimum level, and providing both the first power level and the residue power level to the fuser to raise the fuser temperature to an operating level.
Claim 13
Dependent Claim
27 words
The method of claim 9 including the step of resuming operation of the other operating components to produce copies when the fuser temperature reaches the operating level.
Claim 14
Dependent Claim
24 words
The method of claim 10 including the step of providing only residue power to the fuser when the other operating components are producing copies.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-02-07 | 1986-08-09 | 1987-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-02-07 | 1990-08-09 | 1991-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-02-07 | 1994-08-09 | 1995-02-08 | $7700.00 | Window Closed / Lapsed |