Patent US5087947A successfully refreshed from Google Patents.
US5087947A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat-fixing apparatus
Assignee: Proterial Ltd
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Filing: 1990-08-07
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Granted: 1992-02-11
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Expires: 2010-08-07
Abstract
Abstract Heat-fixing apparatus including a heat roll and a pressure roll and a pressure roll which are rotatable in a pressed contact state for heat fixing of toner image carried on a continuous paper and defining a gap an introduction guide disposed upstream of the heat roll and the pressure roll for guiding the continuous paper into a gap between the heat roll and the pressure roll; and a pair of paper-discharging rolls disposed downstream of the heat roll and the pressure roll and rotatable in a pressed contact state and defining a gap for permitting the continuous paper to pass therethrough. The pressure roll is movable away from the heat roll, and the gap between the heat roll and the pressure roll is located above a plane including a downstream end of the introduction guide and the gap between the pair of paper-discharging rolls. The pair of paper-discharging rolls provide tension to the continuous paper when the pressure roll moves away from the heat roll, so that the continuous paper separates not only from the heat roll but also from the pressure roll.
Inventors
- 👤 Mitsuyasu Torino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:09
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/20; G03G15/2003; G03G15/2014; G03G15/2017; G03G15/2032; G03G2215/00; G03G2215/00362; G03G2215/00367; G03G2215/00417; G03G2215/00421; G03G2215/00443; G03G2215/00451; G03G2215/00455; G03G2215/00459; G03G2215/20
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
221 words
A heat-fixing apparatus comprising: (a) a heat roll and a pressure roll which are rotatable in a pressed contact state for heat fixing of toner image carried on a continuous paper and for defining a first gap through which said paper passes during heat fixing; (b) an introduction guide disposed upstream of said heat roll and said pressure roll for guiding said continuous paper into said first gap between said heat roll and said pressure roll; and (c) a pair of paper-discharging rolls disposed downstream of said heat roll and said pressure roll, rotatable in a pressed contact state, and defining a second gap for permitting said continuous paper to pass therethrough; said pressure roll being movable away from said heat roll, wherein said heat-fixing apparatus further includes means for preventing scorching of said continuous paper by said heat roll during non-fixing periods of operation, said means including said first gap between said heat roll and said pressure roll being located above a plane including a downstream end of said introduction guide and said second gap between said pair of paper-discharging rolls, said pair of paper-discharging rolls providing tension to said continuous paper when said pressure roll moves away from said heat roll, so that said continuous paper separates not only from said heat roll but also from said pressure roll.
Claim 2
Dependent Claim
221 words
A heat-fixing apparatus comprising: (a) a heat roll and a pressure roll which are rotatable in a pressed contact state for heat fixing of toner image carried on a continuous paper and for defining a first gap through which said paper passes during heat fixing; (b) an introduction guide disposed upstream of said heat roll and said pressure roll for guiding said continuous paper into said first gap between said heat roll and said pressure roll; and (c) a pair of paper-discharging rolls disposed downstream of said heat roll and said pressure roll, rotatable in a pressed contact state, and defining a second gap for permitting said continuous paper to pass therethrough; said pressure roll being movable away from said heat roll, wherein said heat-fixing apparatus further includes means for preventing scorching of said continuous paper by said heat roll during non-fixing periods of operation, said means including said first gap between said heat roll and said pressure roll being located above a plane including a downstream end of said introduction guide and said second gap between said pair of paper-discharging rolls, said pair of paper-discharging rolls providing tension to said continuous paper when said pressure roll moves away from said heat roll, so that said continuous paper separates not only from said heat roll but also from said pressure roll.
Claim 3
Dependent Claim
22 words
The heat-fixing apparatus according to claim 1, wherein said pressure roll is separable from said heat roll by 4 mm or more.
Claim 4
Dependent Claim
27 words
The heat-fixing apparatus according to claim 1, wherein said introduction guide and/or said pair of paper-discharging rolls are movable up and down together with said pressure roll.
Claim 5
Dependent Claim
45 words
The heat-fixing apparatus according to claim 1, wherein said pressure roll is rotatably supported by a movable frame which is pivotally supported by a frame of said heat-fixing apparatus, whereby said pressure roll is movable away from said heat roll by rotating said movable frame.
Claim 6
Dependent Claim
45 words
The heat-fixing apparatus according to claim 4, wherein said introduction guide is fixed to said movable frame, whereby when said movable frame rotates downward, said introduction guide also moves downward so that said continuous paper is separated from said pressure roll and said heat roll.
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) | 1995-02-10 | 1995-08-12 | 1996-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-02-10 | 1999-08-12 | 2000-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-02-10 | 2003-08-12 | 2004-02-11 | $7700.00 | Window Closed / Lapsed |