Patent US4403950A successfully refreshed from Google Patents.
Patent US5053806A successfully refreshed from Google Patents.
US5053806A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat fixing apparatus
Assignee: Brother Industries Ltd
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Filing: 1990-11-29
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Granted: 1991-10-01
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Expires: 2010-11-29
Abstract
Abstract A heat fixing apparatus fixes a transferred image onto a sheet with application of heat. A heat generating device is provided in a housing, and has a plurality of divided heaters for generating heat. A plurality of sensors are provided in the housing to detect temperatures corresponding to individual heaters. A temperature control unit controls the individual heaters respectively corresponding to the temperatures detected by the sensors.
Inventors
- 👤 Hideaki Haigo
- 👤 Yoshinori Endo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:58
CPC Classifications
G; G03; G03D; G03D13/00; G03D13/002; G03G; G03G15/00; G03G15/20; G03G15/2003
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
69 words
A heat fixing apparatus for fixing a transferred image onto a sheet with heat application, comprising: heat generating means having a plurality of heaters for generating heat; a plurality of sensors, each sensor located adjacent to one said heater, each said sensor detecting a temperature of the adjacent heater; and temperature control means for individually controlling each of said heaters in response to the temperatures detected by said sensors.
Claim 2
Dependent Claim
69 words
A heat fixing apparatus for fixing a transferred image onto a sheet with heat application, comprising: heat generating means having a plurality of heaters for generating heat; a plurality of sensors, each sensor located adjacent to one said heater, each said sensor detecting a temperature of the adjacent heater; and temperature control means for individually controlling each of said heaters in response to the temperatures detected by said sensors.
Claim 3
Dependent Claim
35 words
The apparatus as claimed in claim 1, wherein said heaters have end portions and are disposed such that at least one end portion of one heater overlaps at least one end portion of another heater.
Claim 4
Dependent Claim
26 words
The apparatus as claimed in claim 1, wherein said heat generating means includes a supporting member, and wherein said heaters are disposed on said supporting member.
Claim 5
Dependent Claim
42 words
The apparatus as claimed in claim 1, wherein said temperature control means includes switching elements connected to each of said heaters, and wherein said temperature control means turns on and off said switches in response to the temperature detected by said sensors.
Claim 6
Dependent Claim
37 words
The apparatus as claimed in claim 4, wherein said temperature control means further includes analog-digital converters connected to said sensors, and wherein analog signals output by said sensors are connected into digital signals by said analog-digital converters.
Claim 7
Dependent Claim
26 words
The apparatus as claimed in claim 1, further comprising a fan for blowing air to said heaters so as to blow hot air to said sheet.
Claim 8
Dependent Claim
27 words
The apparatus as claimed in claim 1, wherein said sheet is fed in a particular direction, and wherein said heaters are arranged perpendicular to said particular direction.
Claim 9
Dependent Claim
75 words
A heat fixing apparatus for fixing a transferred image on a sheet with application of heat, comprising a housing; heat generating means provided in said housing, said heat generating means having a plurality of separate heaters for generating heat; a plurality of sensors provided in said housing to detect temperatures corresponding to said separate heaters; and temperature control means for individually controlling each of said heaters in response to the temperatures detected by said sensors.
Claim 10
Dependent Claim
75 words
A heat fixing apparatus for fixing a transferred image on a sheet with application of heat, comprising a housing; heat generating means provided in said housing, said heat generating means having a plurality of separate heaters for generating heat; a plurality of sensors provided in said housing to detect temperatures corresponding to said separate heaters; and temperature control means for individually controlling each of said heaters in response to the temperatures detected by said sensors.
Claim 11
Dependent Claim
28 words
The heat fixing apparatus as claimed in claim 8, further comprising a fan for blowing air to said heaters so as to blow hot air to said sheet.
Claim 12
Dependent Claim
29 words
The heat fixing apparatus as claimed in claim 8, wherein said sheet is fed in a particular direction, and wherein said heaters are arranged perpendicular to said particular direction.
Claim 13
Dependent Claim
37 words
The heat fixing apparatus as claimed in claim 10, wherein said heaters have end portions and are disposed such that at least one end portion of one heater overlaps at least one end portion of another heater.
Claim 14
Dependent Claim
39 words
The heat fixing apparatus as claimed in claim 10, wherein said heat generating means includes a supporting member provided in said housing and arranged perpendicular to said particular direction, and wherein said heaters are disposed on said supporting member.
Claim 15
Dependent Claim
37 words
The heat fixing apparatus as claimed in claim 12, wherein said heaters have end portions and are disposed such that at least one end portion of one heater overlaps at least one end portion of another heater.
Claim 16
Dependent Claim
44 words
The heat fixing apparatus as claimed in claim 8, wherein said temperature control means includes switching elements connected to each of said heaters, and wherein said temperature control means turns on and off said switches in response to the temperature detected by said sensors.
Claim 17
Dependent Claim
39 words
The heat fixing apparatus as claimed in claim 14, wherein said temperature control means further includes analog-digital converters connected to said sensors, and wherein analog signals output by said sensors are converted into digital signals by said analog-digital converters.
Claim 18
Dependent Claim
34 words
The heat fixing apparatus as claimed in claim 8, wherein the number of said sensors corresponds to the number of said heaters, and wherein each said sensor is located adjacent to each said heater.
References Cited (Backward Citations)
US4367037A
Cited
US4474456A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-09-30 | 1995-04-01 | 1995-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-09-30 | 1999-04-01 | 1999-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-09-30 | 2003-04-01 | 2003-10-01 | $7700.00 | Window Closed / Lapsed |