US4385826A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Toner image fixing device
Assignee: Canon Inc
•
Filing: 1981-03-26
•
Granted: 1983-05-31
•
Expires: 2001-03-26
Abstract
Abstract A fixing device provided with a heating roller having heating means, a pressure roller for fixing a toner image by transporting a toner image bearing member in cooperation with the heating roller, drive mechanism for rotating the heating roller and pressure roller, and a control for initiating the rotation of the heating roller and pressure roller when the heating roller reaches a determined surface temperature or at a determined time after the heating means is activated, wherein the heating means is so activated at the turning on of the power supply as to reduce the waiting time required by the rollers to reach a satisfactory fixing temperature, thus preventing defective fixing at the start of operation.
Inventors
- 👤 Masayuki Itoh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:54
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/20; G03G15/2003; G03G15/2014; G03G15/2064
Claims Analysis
Total Claims: 42
Claim 1
Independent Claim
77 words
A fixing device, comprising: a heating roller having heating means; a pressure roller for fixing a toner image on a toner image bearing member to be transported between said heating roller and said pressure roller; drive means for rotating said heating roller and said pressure roller; and control means for causing rotation of said heating roller and pressure roller when said heating roller reaches a predetermined surface temperature after the start of function of said heating means.
Claim 2
Dependent Claim
77 words
A fixing device, comprising: a heating roller having heating means; a pressure roller for fixing a toner image on a toner image bearing member to be transported between said heating roller and said pressure roller; drive means for rotating said heating roller and said pressure roller; and control means for causing rotation of said heating roller and pressure roller when said heating roller reaches a predetermined surface temperature after the start of function of said heating means.
Claim 3
Dependent Claim
25 words
A fixing device according to the claim 1, wherein said control means comprises timer means for determining the time for initiating said rotation of rollers.
Claim 4
Dependent Claim
32 words
A fixing device according to the claim 1, wherein said control means comprises a temperature detector for detecting the surface temperature of said heating roller in order to control said drive means.
Claim 5
Dependent Claim
32 words
A fixing device according to the claim 3, wherein said control means comprises comparator means for comparing a signal from said temperature detector with a reference signal corresponding to said predetermined temperature.
Claim 6
Dependent Claim
95 words
A fixing device, comprising: a heating roller having heating means; a pressure roller for fixing a toner image on a toner image bearing member to be transported between said heating roller and said pressure roller; drive means for rotating said heating roller and said pressure roller; and control means adapted to activate said drive means to initiate the rotation of said heating roller and pressure roller when said heating roller reaches a first surface temperature and to terminate said rotation when said heating roller reaches a second surface temperature higher than said first surface temperature.
Claim 7
Dependent Claim
95 words
A fixing device, comprising: a heating roller having heating means; a pressure roller for fixing a toner image on a toner image bearing member to be transported between said heating roller and said pressure roller; drive means for rotating said heating roller and said pressure roller; and control means adapted to activate said drive means to initiate the rotation of said heating roller and pressure roller when said heating roller reaches a first surface temperature and to terminate said rotation when said heating roller reaches a second surface temperature higher than said first surface temperature.
Claim 8
Dependent Claim
24 words
A fixing device according to the claim 5, wherein said control means comprises timer means for initiating and terminating said rotation of the rollers.
Claim 9
Dependent Claim
32 words
A fixing device according to the claim 5, wherein said control means comprises a temperature detector for detecting the surface temperature of said heating roller in order to control said drive means.
Claim 10
Dependent Claim
42 words
A fixing device according to the claim 7, wherein said control means comprises comparator means for comparing a signal from said temperature detector with a reference signal corresponding to a first temperature and with a reference signal corresponding to a second temperature.
Claim 11
Dependent Claim
21 words
A device according to claim 5, wherein the first surface temperature is not lower than 70% of said second surface temperature.
Claim 12
Dependent Claim
22 words
A device according to claim 5, wherein the second surface temperature is a predetermined temperature which is predetermined for the stand-by state.
Claim 13
Dependent Claim
19 words
A device according to claim 5, wherein said second surface temperature is a temperature representing completion of warm-up rotation.
Claim 14
Dependent Claim
20 words
A device according to claim 10, wherein the first surface temperature is not lower than 70% of the stand-by temperature.
Claim 15
Dependent Claim
73 words
A fixing device, comprising: a heating roller having heating means; a pressure roller for fixing a toner image on a toner image bearing member to be transported between said heating roller and said pressure roller; drive means for rotating said heating roller and said pressure roller; and control means for causing the rotation of said heating roller and pressure roller at a predetermined time after the start of function of said heating means.
Claim 16
Dependent Claim
73 words
A fixing device, comprising: a heating roller having heating means; a pressure roller for fixing a toner image on a toner image bearing member to be transported between said heating roller and said pressure roller; drive means for rotating said heating roller and said pressure roller; and control means for causing the rotation of said heating roller and pressure roller at a predetermined time after the start of function of said heating means.
Claim 17
Dependent Claim
84 words
A fixing device, comprising: a heating roller having heating means; a pressure roller for fixing a toner image on a toner image bearing member to be transported between said heating roller and said pressure roller; drive means for rotating said heating roller and said pressure roller; and control means for causing rotation of said heating roller and pressure roller at a predetermined period after the start of function of said heating means and terminating said rotation after the lapse of a second predetermined period.
Claim 18
Dependent Claim
84 words
A fixing device, comprising: a heating roller having heating means; a pressure roller for fixing a toner image on a toner image bearing member to be transported between said heating roller and said pressure roller; drive means for rotating said heating roller and said pressure roller; and control means for causing rotation of said heating roller and pressure roller at a predetermined period after the start of function of said heating means and terminating said rotation after the lapse of a second predetermined period.
Claim 19
Dependent Claim
64 words
A fixing device according to any one of claims 1, 5, 13 or 14, wherein said control means comprises temperature detecting means for detecting the surface temperature of said pressure roller and means for causing rotation of said heating roller and pressure roller when said surface temperature of said pressure roller is identified by said temperature detecting means as lower than a predetermined temperature.
Claim 20
Dependent Claim
22 words
A fixing device according any one of claims 1 to 14, wherein said pressure roller is provided with a surfacial rubber layer.
Claim 21
Dependent Claim
21 words
A fixing device according to the claim 16, wherein said heating roller and pressure roller are constantly maintained in pressure contact.
Claim 22
Dependent Claim
44 words
A fixing device according to any one of claims 1 to 14, wherein said heating means comprises means for controlling the temperature of said heating means in order to maintain at least the heating roller at the fixing temperature after the start of operation.
Claim 23
Dependent Claim
18 words
A fixing device according to claim 15, wherein said pressure roller is provided with a surfacial rubber layer.
Claim 24
Dependent Claim
37 words
A device according to claim 14, wherein the predetermined period is the period from the first predetermined time to the surface temperature of the heating roller reaching a predetermined temperature which is predetermined for a stand-by state.
Claim 25
Dependent Claim
24 words
A device according to claim 14, wherein the predetermined period is the period from the first predetermined time to the completion of warm-up operation.
Claim 26
Independent Claim
62 words
A device according to any one of claims 10, 11, 20 of 21, wherein said control means comprises temperature detecting means for detecting the surface temperature of said pressure roller and means for causing rotation of said heating roller and pressure roller when said surface temperature of pressure roller is identified by said temperature detecting means as lower than a determined temperature.
Claim 27
Dependent Claim
17 words
A device according to claim 22, wherein said pressure roller is provided with a surfacial rubber layer.
Claim 28
Dependent Claim
19 words
A device according to claim 23, wherein said heating roller and pressure roller are constantly maintained in pressure contact.
Claim 29
Dependent Claim
106 words
A tone image fixing device, comprising: a fixing roller; heating means for heating said fixing roller; a pressure roller for cooperating with said fixing roller to fix a toner image on a toner image bearing member when it is transported between said fixing roller and said pressure roller; drive means for rotating said fixing roller and said pressure roller; and control means for causing rotation of said fixing roller and pressure roller when said fixing roller has attained a first predetermined temperature which is not higher than a second temperature which is predetermined for a stand-by state, after the start of operation of said heating means.
Claim 30
Dependent Claim
106 words
A tone image fixing device, comprising: a fixing roller; heating means for heating said fixing roller; a pressure roller for cooperating with said fixing roller to fix a toner image on a toner image bearing member when it is transported between said fixing roller and said pressure roller; drive means for rotating said fixing roller and said pressure roller; and control means for causing rotation of said fixing roller and pressure roller when said fixing roller has attained a first predetermined temperature which is not higher than a second temperature which is predetermined for a stand-by state, after the start of operation of said heating means.
Claim 31
Dependent Claim
22 words
A device according to claim 25, wherein said first predetermined temperature is not higher than a temperature representing completion of warm-up operation.
Claim 32
Dependent Claim
21 words
A device according to claim 25, wherein said first predetermined temperature is not lower than 70% of said second predetermined temperature.
Claim 33
Dependent Claim
107 words
A toner image fixing device, comprising: a fixing roller; heating means for heating said fixing roller; a pressure roller for cooperating with said fixing roller to fix a toner image on a toner image bearing member when it is transported between said fixing roller and said pressure roller; drive means for rotating said fixing roller and said pressure roller; and control means for causing the rotation of said fixing roller and pressure roller at a predetermined time which is on or before the temperature of said fixing roller attains a value which is predetermined for a stand-by state, after the start of function of said heating means.
Claim 34
Dependent Claim
107 words
A toner image fixing device, comprising: a fixing roller; heating means for heating said fixing roller; a pressure roller for cooperating with said fixing roller to fix a toner image on a toner image bearing member when it is transported between said fixing roller and said pressure roller; drive means for rotating said fixing roller and said pressure roller; and control means for causing the rotation of said fixing roller and pressure roller at a predetermined time which is on or before the temperature of said fixing roller attains a value which is predetermined for a stand-by state, after the start of function of said heating means.
Claim 35
Dependent Claim
18 words
A device according to claim 28, wherein the predetermined time is on or before completion of warm-up time.
Claim 36
Independent Claim
61 words
A device according to any one of claims 25, 26, 27, 28 or 29, wherein said control means comprises temperature detecting means for detecting the temperature of said pressure roller and means for causing rotation of said fixing roller and pressure roller when said temperature of pressure roller is identified by said temperature detecting means as lower than a predetermined temperature.
Claim 37
Dependent Claim
18 words
A device according to the claim 30, wherein said pressure roller is provided with a surfacial rubber layer.
Claim 38
Dependent Claim
19 words
A device according to claim 31, wherein said fixing roller and pressure roller are constantly maintained in pressure contact.
Claim 39
Dependent Claim
94 words
A toner image fixing device, comprising: heating means; a first roller associated with said heating means; a second roller cooperative with said first roller to fix, therebetween, with heat, a toner image on an image bearing member; drive means for rotating said first and second rollers; means for detecting a temperature of at least one of said first and second rollers; and control means for detecting that said at least one of said first and second rollers has attained a predetermined temperature and to start rotation of said first and second rollers responsive thereto.
Claim 40
Dependent Claim
94 words
A toner image fixing device, comprising: heating means; a first roller associated with said heating means; a second roller cooperative with said first roller to fix, therebetween, with heat, a toner image on an image bearing member; drive means for rotating said first and second rollers; means for detecting a temperature of at least one of said first and second rollers; and control means for detecting that said at least one of said first and second rollers has attained a predetermined temperature and to start rotation of said first and second rollers responsive thereto.
Claim 41
Dependent Claim
45 words
A device according to claim 33, wherein said second roller is not directly heated by said heating means, and the temperature of the second roller is detected by said detecting means, and wherein the predetermined temperature is a temperature at which incomplete fixing operation occurs.
Claim 42
Dependent Claim
19 words
A device according to claim 33, wherein the predetermined temperature is a temperature at which incomplete fixing operation occurs.
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) | 1986-05-30 | 1986-11-29 | 1987-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-30 | 1990-11-29 | 1991-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-30 | 1994-11-29 | 1995-05-31 | $7700.00 | Window Closed / Lapsed |