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US5713069A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Induction heat fixing apparatus with preheating guide
Assignee: Minolta Co Ltd
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Filing: 1996-11-27
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Granted: 1998-01-27
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Expires: 2016-11-27
Abstract
Abstract The present invention relates to an induction heat fixing apparatus for heating a transporting medium containing: a system for generating an induction heat by using an induction current; a pressure member disposed in pressing contact with the induction heat generating system at a contact portion; and a preheating member positioned at upstream side of the contact portion with respect to the transporting direction of the medium, whereby the preheating member is heated by the induction current generated by the induction heat generating system. One object of present invention is to prepare an induction heat fixing apparatus which is compact and has high efficient heating.
Inventors
- 👤 Takeshi Kato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:52
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/20; G03G15/2003; G03G15/2014; G03G15/2064
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
75 words
An induction heat fixing apparatus for heating a transporting medium comprising: means for generating an induction heat by using an induction current; a pressure member disposed in pressing contact with the induction heat generating means at a contact portion; and a preheating member positioned at upstream side of the contact portion with respect to the transporting direction of the medium, said preheating member heated by the induction current generated by the induction heat generating means.
Claim 2
Dependent Claim
75 words
An induction heat fixing apparatus for heating a transporting medium comprising: means for generating an induction heat by using an induction current; a pressure member disposed in pressing contact with the induction heat generating means at a contact portion; and a preheating member positioned at upstream side of the contact portion with respect to the transporting direction of the medium, said preheating member heated by the induction current generated by the induction heat generating means.
Claim 3
Dependent Claim
52 words
The induction heat fixing apparatus of claim 1 wherein the induction heat generating means comprises: a heat member formed by an electrically conductive member and having a hollow space in its interior; core within the heat roller; coil provided around the core; and means for passing an alternating current through the coil.
Claim 4
Dependent Claim
33 words
The induction heat fixing apparatus of claim 1 wherein the preheating member has a length longer than that of the transporting medium along a direction perpendicular to the transporting direction of the medium.
Claim 5
Dependent Claim
29 words
The induction heat fixing apparatus of claim 1 wherein the preheating member has the inner surface which is confronted to the medium, said inner surface being colored by black.
Claim 6
Dependent Claim
27 words
The induction heat fixing apparatus of claim 2 further comprises a heat sensing means which senses the surface of the heat member and controls the alternating current.
Claim 7
Dependent Claim
27 words
The induction heat fixing apparatus of claim 5 further comprises a breaker which shuts down the alternating current when the heat sensing means senses a predetermined value.
Claim 8
Dependent Claim
20 words
The induction heat fixing apparatus of claim 1 wherein the surface of the pressure member is formed by silicone rubber.
Claim 9
Dependent Claim
20 words
The induction heat fixing apparatus of claim 2 wherein the surface of the heat member is formed by nonmagnetic material.
Claim 10
Dependent Claim
17 words
The induction heat fixing apparatus of claim 1 wherein the preheating member is formed by ferromagnetic material.
Claim 11
Dependent Claim
25 words
The induction heat fixing apparatus of claim 2 wherein the preheating member is formed along the surface of the heat member within a predetermined distance.
Claim 12
Dependent Claim
53 words
The induction heat fixing apparatus of claim 10 wherein the preheating member has a first portion which is formed along the surface of the heat member within a predetermined distance and a second portion which extends to an upstream side of the first portion with respect to the transporting direction of the medium.
Claim 13
Dependent Claim
27 words
The induction heat fixing apparatus of claim 1 wherein the preheating member has a heat insulator which is disposed on the outer surface of the preheating member.
Claim 14
Dependent Claim
15 words
The induction heat fixing apparatus of claim 12 wherein the heat insulator is silicone rubber.
Claim 15
Dependent Claim
84 words
An induction heat fixing apparatus for heating a transporting medium comprising: means for generating an induction heat by using an induction current; a rotating sleeve covering the induction heat generating means; a pressure member disposed in pressing contact with the surface of the sleeve at a contact portion; and a preheating member positioned at upstream side of the contact portion with respect to the transporting direction of the medium, said preheating member heated by the induction current generated by the induction heat generating means.
Claim 16
Dependent Claim
84 words
An induction heat fixing apparatus for heating a transporting medium comprising: means for generating an induction heat by using an induction current; a rotating sleeve covering the induction heat generating means; a pressure member disposed in pressing contact with the surface of the sleeve at a contact portion; and a preheating member positioned at upstream side of the contact portion with respect to the transporting direction of the medium, said preheating member heated by the induction current generated by the induction heat generating means.
Claim 17
Dependent Claim
52 words
The induction heat fixing apparatus of claim 14 wherein the induction heat generating means comprises: a heat member formed by an electrically conductive member and having a hollow space in its interior; core within the heat roller; coil provided around the core; and means for passing an alternating current through the coil.
Claim 18
Dependent Claim
19 words
The induction heat fixing apparatus of claim 14 wherein the sleeve has an electrical conductivity and a magnetic character.
Claim 19
Dependent Claim
17 words
The induction heat fixing apparatus of claim 16 wherein the sleeve has a fluoride coated outer surface.
Claim 20
Dependent Claim
27 words
The induction heat fixing apparatus of claim 14 wherein the preheating member has a heat insulator which is disposed on the outer surface of the preheating member.
Claim 21
Dependent Claim
99 words
An induction heat fixing apparatus for heating a transporting medium comprising: a rotating heat member formed by an electrically conductive member; means for generating an induction heat by using an induction current, said generating means being confronted to the outer surface for the rotating heat member; a pressure member disposed in pressing contact with the surface of the sleeve at a contact portion; and a preheating member positioned at upstream side of the contact portion with respect to the transporting direction of the medium, said preheating member heated by the induction current generated by the induction heat generating means.
Claim 22
Dependent Claim
99 words
An induction heat fixing apparatus for heating a transporting medium comprising: a rotating heat member formed by an electrically conductive member; means for generating an induction heat by using an induction current, said generating means being confronted to the outer surface for the rotating heat member; a pressure member disposed in pressing contact with the surface of the sleeve at a contact portion; and a preheating member positioned at upstream side of the contact portion with respect to the transporting direction of the medium, said preheating member heated by the induction current generated by the induction heat generating means.
Claim 23
Dependent Claim
25 words
The induction heat fixing apparatus of claim 19 wherein the preheating member is formed along the surface of the heat member within a predetermined distance.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-01-26 | 2001-07-28 | 2002-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-01-26 | 2005-07-28 | 2006-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-01-26 | 2009-07-28 | 2010-01-27 | $7700.00 | Window Closed / Lapsed |