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US 8,027,599 B2Granted
Image forming apparatus
AssigneeSamsung Electronics Co., Ltd.
InventorJoong Kil Kwon
Life of this patent
Estimating the term…
Abstract
An image forming apparatus includes an overheat prevention device to control a heater based on a fusing temperature detected by a temperature sensor within a predetermined range when a controller generates an abnormal heater control signal.
Claims20
An image forming apparatus comprising:
- a fusing device including a heater;
- a temperature sensor to detect a fusing temperature varying with an operation of the heater;
- a controller to output a heater control signal to control the heater based on the detected fusing temperature such that the detected fusing temperature varies within a first temperature range;
- and
- an overheat prevention device to control the heater to prevent overheating of the fusing device when the heater control signal of the controller is abnormal,
- wherein the overheat prevention device controls the heater when the heater control signal of the controller is abnormal due to an error on the controller, such that the detected fusing temperature varies within a second temperature range including the first temperature range.
3 more elements
An image forming apparatus comprising:
- a fusing device to fuse an image on a printing medium;
- a temperature sensor to detect a fusing temperature of the fusing device;
- a controller to generate a heater control signal to control the fusing device according to the detected fusing temperature and a first reference;
- and
- an overheat prevention device to control the fusing device according to the detected fusing temperature and a second reference such that one of the controller and the overheat prevention device controls the fusing device when the other one of the controller and the overheat prevention device does not control the fusing device,
- wherein the overheat prevention device comprises:
- a comparing unit to generate an overheat signal, and
- wherein the fusing device comprises:
- a heater to be turned on and off according to one of the overheat signal and the heater control signal to maintain the fusing temperature in a predetermined range.
6 more elements
An image forming apparatus comprising:
- a fusing device including a heater to be turned on and off according to one of an overheat signal and a heater control signal to maintain a fusing temperature in a predetermined range to fuse an image on a printing medium;
- a temperature sensor to detect the fusing temperature varying with an operation of the heater of the fusing device;
- a controller to output the heater control signal to control the heater of the fusing device based on the detected fusing temperature and a first reference;
- and
- an overheat prevention device includes a comparing unit to generate the overheat signal to control the heater of the fusing device according to the detected fusing temperature and a second reference such that one of the controller and the overheat prevention device controls the fusing device when the other one of the controller and the overheat prevention device does not control the fusing device, and to prevent overheating of the fusing device when the heater control signal of the controller is abnormal.
2 more elements
An image forming apparatus comprising:
- a fusing device including a heater to fuse an image on a printing medium;
- a temperature sensor to detect a fusing temperature varying with an operation of the heater of the fusing device;
- a controller to output a heater control signal according to the detected fusing temperature and a first reference such that the detected fusing temperature varies within a first temperature range;
- and
- an overheat prevention device to generate another heater control signal, and having a logic unit to control the fusing device according to at least one of the heater control signal and the another heater controller signal when the heater control signal of the controller is abnormal due to an error of the controller, such that the detected fusing temperature varies within a second temperature range including the first temperature range.
2 more elements
Dependencies are inferred from the claim text.