US4373801A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fixing temperature selecting control in a copying machine
Assignee: Sharp Corp
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Filing: 1979-10-26
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Granted: 1983-02-15
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Expires: 1999-10-26
Abstract
Abstract A copying machine having a thermal fixing circuit, and a fixing temperature controlling system for regulating a desired fixing temperature in accordance with variations of copy paper characteristics. A first manual copy switch is actuated for selecting a normal fixing temperature when a normal, thin copy paper is used. A second manual copy switch is actuated for selecting a higher fixing temperature when a thick copy paper is used.
Inventors
- 👤 Fukusaburo Itoh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:01
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/20; G03G15/2003
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
142 words
An electrophotographic copying machine capable of varying the fixing temperature for fusing a toner image formed on copy paper comprising: a means for forming a toner image on the surface of said copy paper, a thermal fixing system for fixing said toner image on the surface of said copy paper, a fixing temperature control circuit which activates said thermal fixing system, a first manual switch which initiates the copying operation of said copying machine and said fixing temperature control circuit to activate said thermal fixing system to generate a first temperature for fixing said toner image to a first copy paper, and a second manual switch which initiates the copying operation of said copying machine and said fixing temperature control circuit to activate said thermal fixing system to generate a second temperature for fixing said toner image to a second copy paper.
Claim 2
Dependent Claim
142 words
An electrophotographic copying machine capable of varying the fixing temperature for fusing a toner image formed on copy paper comprising: a means for forming a toner image on the surface of said copy paper, a thermal fixing system for fixing said toner image on the surface of said copy paper, a fixing temperature control circuit which activates said thermal fixing system, a first manual switch which initiates the copying operation of said copying machine and said fixing temperature control circuit to activate said thermal fixing system to generate a first temperature for fixing said toner image to a first copy paper, and a second manual switch which initiates the copying operation of said copying machine and said fixing temperature control circuit to activate said thermal fixing system to generate a second temperature for fixing said toner image to a second copy paper.
Claim 3
Dependent Claim
56 words
The copying machine of claim 1, wherein said first copy paper is a thin copy paper having a small specific gravity and said first temperature is a correspondingly low fixing temperature, and said second copy paper is a thick copy paper having a large specific gravity and said second temperature is a correspondingly high fixing temperature.
Claim 4
Dependent Claim
26 words
The copying machine of claim 2, further including a detection switch which develops a detection output which responds to the introduction of said thick copy paper.
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) | 1986-02-14 | 1986-08-16 | 1987-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-02-14 | 1990-08-16 | 1991-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-02-14 | 1994-08-16 | 1995-02-15 | $7700.00 | Window Closed / Lapsed |