US4656338A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recording apparatus
Assignee: Canon Inc
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Filing: 1983-08-18
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Granted: 1987-04-07
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Expires: 2003-08-18
Abstract
Abstract A recording apparatus in which a control unit utilizes a copy counter for plural purposes. The control unit also achieves other features such as securer jam detection, a constant operation regardless of the frequency of commercial power supply, securer timing and temperature control with limited number of sensors.
Inventors
- 👤 Toshiaki Yagasaki
- 👤 Kouki Kuroda
- 👤 Tsuneki Inuzuka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:31
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/55
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
140 words
A temperature control apparatus for heating means, comprising: temperature detecting means for detecting the temperature of said heating means; means for detecting the zero-cross points of an AC power supply of said apparatus and generating corresponding zero-cross pulses; and control means for controlling said heating means in response to the temperature detected by said temperature detecting means to keep said heating means at a predetermined temperature; wherein said control means, upon first turn-on of said heating means, selects one of a plurality of preset values of a timer, in response to the detected temperature, for determining the duration of power supply to said heating means, and wherein said control means controls said heating means in response to said zero-cross pulses and the detected temperature without utilizing said timer when a temperature of said heating means is near the predetermined temperature.
Claim 2
Dependent Claim
140 words
A temperature control apparatus for heating means, comprising: temperature detecting means for detecting the temperature of said heating means; means for detecting the zero-cross points of an AC power supply of said apparatus and generating corresponding zero-cross pulses; and control means for controlling said heating means in response to the temperature detected by said temperature detecting means to keep said heating means at a predetermined temperature; wherein said control means, upon first turn-on of said heating means, selects one of a plurality of preset values of a timer, in response to the detected temperature, for determining the duration of power supply to said heating means, and wherein said control means controls said heating means in response to said zero-cross pulses and the detected temperature without utilizing said timer when a temperature of said heating means is near the predetermined temperature.
Claim 3
Dependent Claim
30 words
A temperature control apparatus according to claim 1, wherein said control means controls the power supply to said heating means in response to the detected temperature of said heating means.
Claim 4
Dependent Claim
32 words
An apparatus according to claim 1, wherein said control means includes a microcomputer arranged to execute a program for controlling said heating means at every time when said zero-cross pulse is inputted.
Claim 5
Dependent Claim
117 words
A temperature control apparatus for heating means, comprising: temperature detecting means for detecting the temperature of said heating means; means for detecting the zero-cross points of an AC power supply and generating corresponding zero-cross pulses; and control means for controlling said heating means in response to the temperature detected by said temperature detecting means; wherein said control means controls said heating means in response to said zero-cross pulses and control counts of a first timer when the detected temperature is lower than a determined temperature, and supplies power to said heating means until said heating means reaches said determined temperature if the detected temperature does not reach said determined temperature at the expiration of said first timer.
Claim 6
Dependent Claim
117 words
A temperature control apparatus for heating means, comprising: temperature detecting means for detecting the temperature of said heating means; means for detecting the zero-cross points of an AC power supply and generating corresponding zero-cross pulses; and control means for controlling said heating means in response to the temperature detected by said temperature detecting means; wherein said control means controls said heating means in response to said zero-cross pulses and control counts of a first timer when the detected temperature is lower than a determined temperature, and supplies power to said heating means until said heating means reaches said determined temperature if the detected temperature does not reach said determined temperature at the expiration of said first timer.
Claim 7
Dependent Claim
27 words
A temperature control apparatus according to claim 4, wherein said control means is adapted to start a second timer when the detected temperature reaches said determined temperature.
Claim 8
Dependent Claim
121 words
A temperature control apparatus for heating means, comprising: temperature detecting means for detecting the temperature of said heating means; means for detecting the zero-cross points of an AC power supply and generating corresponding zero-cross pulses; and control means for controlling said heating means in response to the temperature detected by said temperature detecting means; wherein said control means controls said heating means in response to said zero-cross pulses and control counts of a first timer when the detected temperature is lower than a determined temperature, and further controls said heating means in response to said zero-cross pulses and control counts of a second timer if the detected temperature does not reach said determined temperature at the expiration of said first timer.
Claim 9
Dependent Claim
121 words
A temperature control apparatus for heating means, comprising: temperature detecting means for detecting the temperature of said heating means; means for detecting the zero-cross points of an AC power supply and generating corresponding zero-cross pulses; and control means for controlling said heating means in response to the temperature detected by said temperature detecting means; wherein said control means controls said heating means in response to said zero-cross pulses and control counts of a first timer when the detected temperature is lower than a determined temperature, and further controls said heating means in response to said zero-cross pulses and control counts of a second timer if the detected temperature does not reach said determined temperature at the expiration of said first timer.
Claim 10
Dependent Claim
135 words
A temperature control apparatus for heating means, comprising: temperature detecting means for detecting the temperature of said heating means; means for detecting the zero-cross points of an AC power supply and generating corresponding zero-cross pulses; and control means for controlling said heating means in response to the temperature detected by said temperature detecting means; wherein said control means controls said heating means in response to said zero-cross pulses and control counts of a first timer when the detected temperature is lower than a determined temperature, and starts said first timer repeatedly if the detected temperature does not reach said determined temperature at the expiration of said first timer, and further controls said heating means in response to said zero-cross pulses and control counts of a second timer when the detected temperature reaches said determined temperature.
Claim 11
Dependent Claim
135 words
A temperature control apparatus for heating means, comprising: temperature detecting means for detecting the temperature of said heating means; means for detecting the zero-cross points of an AC power supply and generating corresponding zero-cross pulses; and control means for controlling said heating means in response to the temperature detected by said temperature detecting means; wherein said control means controls said heating means in response to said zero-cross pulses and control counts of a first timer when the detected temperature is lower than a determined temperature, and starts said first timer repeatedly if the detected temperature does not reach said determined temperature at the expiration of said first timer, and further controls said heating means in response to said zero-cross pulses and control counts of a second timer when the detected temperature reaches said determined temperature.
Claim 12
Dependent Claim
95 words
A temperature control apparatus comprising: temperature detecting means for detecting temperature; and control means for controlling power supply to a load in response to an output signal from said temperature detecting means; wherein said control means includes analog-to-digital converting means for performing an analog-to-digital conversion of the output signal from said temperature detecting means, and controls power supply to said load in accordance with the analog-to-digital converted value from said analog-to-digital converting means, and identifies whether said temperature detecting means is normal or not by discriminating the analog-to-digital converted value from said analog-to-digital converting means.
Claim 13
Dependent Claim
95 words
A temperature control apparatus comprising: temperature detecting means for detecting temperature; and control means for controlling power supply to a load in response to an output signal from said temperature detecting means; wherein said control means includes analog-to-digital converting means for performing an analog-to-digital conversion of the output signal from said temperature detecting means, and controls power supply to said load in accordance with the analog-to-digital converted value from said analog-to-digital converting means, and identifies whether said temperature detecting means is normal or not by discriminating the analog-to-digital converted value from said analog-to-digital converting means.
Claim 14
Dependent Claim
40 words
A temperature control apparatus according to claim 8, wherein said control means identifies whether said temperature detecting means is in a broken state or in an extreme temperature condition by discriminating the analog-to-digital converted value from said analog-to-digital converting means.
Claim 15
Dependent Claim
36 words
A temperature control apparatus according to claim 8, wherein said control means identifies whether the temperature is in an abnormal state or in normal state by discriminating the analog-to-digital converted value from said analog-to-digital converting means.
Claim 16
Dependent Claim
20 words
An apparatus according to claim 8, wherein said control means includes a microcomputer operable in accordance with a predetermined program.
Claim 17
Dependent Claim
16 words
An apparatus according to claim 8, wherein said load is a heater for fixing an image.
Claim 18
Dependent Claim
91 words
A temperature control apparatus comprising: temperature detecting means for detecting temperature; correcting means for correcting an output from said temperature detecting means; means for detecting the zero-cross points of an AC power supply of said apparatus and generating corresponding zero-cross pulses; analog-to-digital converting means for performing an analog-to-digital conversion of a correction signal from said correcting means; and control means for controlling power supply to a load on the basis of the analog-to-digital converted value from said analog-to-digital converting means each time a zero-cross pulse is inputted to said control means.
Claim 19
Dependent Claim
91 words
A temperature control apparatus comprising: temperature detecting means for detecting temperature; correcting means for correcting an output from said temperature detecting means; means for detecting the zero-cross points of an AC power supply of said apparatus and generating corresponding zero-cross pulses; analog-to-digital converting means for performing an analog-to-digital conversion of a correction signal from said correcting means; and control means for controlling power supply to a load on the basis of the analog-to-digital converted value from said analog-to-digital converting means each time a zero-cross pulse is inputted to said control means.
Claim 20
Dependent Claim
27 words
An apparatus according to claim 13, wherein said temperature detecting means is a thermistor and said correcting means includes a resistor connected in parallel with the thermistor.
Claim 21
Dependent Claim
36 words
An apparatus according to claim 13, wherein said control means includes a microcomputer operable to execute a program for controlling power supply to said load each time a zero-cross pulse is inputted to said control means.
Claim 22
Dependent Claim
135 words
A temperature control apparatus for heating means, comprising: temperature detecting means for detecting the temperature of said heating means; means for detecting the zero-cross points of an AC power supply of said apparatus and generating corresponding zero-cross pulses; and control means for controlling said heating means in response to the temperature detected by said temperature detecting means to keep said heating means at a predetermined temperature; wherein said control means, upon first turn-on of said heating means, controls the start of a timer for determining the duration of power supply to said heating means in response to the detected temperature and wherein said control means controls said heating means in response to said zero-cross pulses and the detected temperature without utilizing said timer when a temperature of said heating means is near the predetermined temperature.
Claim 23
Dependent Claim
135 words
A temperature control apparatus for heating means, comprising: temperature detecting means for detecting the temperature of said heating means; means for detecting the zero-cross points of an AC power supply of said apparatus and generating corresponding zero-cross pulses; and control means for controlling said heating means in response to the temperature detected by said temperature detecting means to keep said heating means at a predetermined temperature; wherein said control means, upon first turn-on of said heating means, controls the start of a timer for determining the duration of power supply to said heating means in response to the detected temperature and wherein said control means controls said heating means in response to said zero-cross pulses and the detected temperature without utilizing said timer when a temperature of said heating means is near the predetermined temperature.
Claim 24
Dependent Claim
32 words
An apparatus according to claim 16, wherein said control means includes a microcomputer arranged to execute a program for controlling said heating means at every time when said zero-cross pulse is inputted.
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) | 1990-04-06 | 1990-10-06 | 1991-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-06 | 1994-10-06 | 1995-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-06 | 1998-10-06 | 1999-04-07 | $7700.00 | Window Closed / Lapsed |