摘要:
An image heating apparatus includes a flexible sleeve; a heater contacted to an inner circumferential surface of the sleeve; a pressing roller for forming a nip, between itself and the sleeve contacted by the heater, in which a recording material is to be heated; and a supporting member for supporting the heater, the supporting member being disposed inside the heater and having an area in which the sleeve is sandwiched between the supporting member and the pressing roller at least on an upstream side and a downstream side of a heater supporting position of the supporting member with respect to a rotational direction of the sleeve. The supporting member is provided, at its surface in the area, with a plurality of recessed portions for permitting passage of a lubricant. The recessed portions are provided only in an area in which a predetermined maximum width sheet available in the image heating apparatus is passable.
摘要:
An image forming apparatus and method which can take a countermeasure against a tail or the like in consideration of differences of various conditions such as a kind of transfer paper and the like is provided. The apparatus has an image processing portion for extracting an image pattern whose image information has a concentration of 100% and executing a thin-out process for thinning out a predetermined area in the extracted image pattern at a predetermined ratio. The image processing portion or step changes the thin-out process according to the transfer paper kind.
摘要:
An object of the present invention is to provide an image heating apparatus for heating an image on a recording material that has a heating member, a first heat generating element mounted on the heating member, a second heat generating element mounted on the heating member, a temperature detecting element for detecting a temperature of the heating member, the temperature detecting element being disposed in an area where the recording material of a predetermined minimum size does not pass, and power supply control device for controlling electric power supply to the first and second heat generating elements in conformity with both of the detected temperature by the temperature detecting element and the number of continuously passing recording materials.
摘要:
An output of a DC high voltage source is supplied as a bias to a heat fixing apparatus. An output of the DC high voltage source is divided by resistors, and a divided output is supplied as a DC bias to a charging apparatus. A feedback circuit generates a feedback signal corresponding to a difference between the divided output and a reference voltage, for supply to the DC high voltage source thereby controlling the divided output voltage at a desired value. Such structure allows a supply of a bias voltage to the heat fixing apparatus higher than the bias voltage to the charging apparatus, thereby eliminating defects in the fixing apparatus such as a fixation tailing or an offset phenomenon. Also the charging apparatus can be given an exactly controlled bias voltage, thereby avoiding a halftone density unevenness resulting from an uneven charging.
摘要:
The present invention relates to an image heating apparatus, such as a heating fixing apparatus for fixing a toner image formed on plane paper. By making the width of a heat collecting plate of a thermoprotector for suppressing an excessive temperature rise of a heater provided in the apparatus, a failure in an image is suppressed irrespective of variations in the mounting position of the thermoprotector.
摘要:
An image forming apparatus has an image forming unit for forming an image on a recording material, a fixing device for fixing the image on the recording material, an overlap-feed detector such as a transfer current detector for detecting an overlap-feed of the recording material conveyed to the fixing device and a set temperature controller for controlling the set temperature. The fixing device is maintained at a set temperature during an image fixing operation. The controller lowers the set temperature or stops the conveyance of the recording material when the overlap-feed detector detects the overlap feed. Accordingly, the image forming apparatus can prevent a fixing device from breaking due to an overlap-feed of a recording material.
摘要:
A fixing rotational body is rotated immediately before shifting from a standby mode to a power saving mode in which not only power supply to a heater and the rotation of the fixing rotational body are stopped but also a timer is stopped so that the reliability of the thermistor detection temperature when returning from the power saving mode is improved, and fixing defect is prevented while power consumption in the power saving mode is reduced.
摘要:
A reversely-rotatable roller conveys a sheet having an image formed on its one side at a sheet conveying velocity faster than that of a conveying roller by normal rotation and then, the reversely-rotatable roller conveys the sheet to a re-conveying path by reverse rotation. The sheet conveying velocity of the reversely-rotatable roller when the reversely-rotatable roller reversely rotates is made slower than the sheet conveying velocity when the reversely-rotatable roller normally rotates so that the sheet conveying velocity of the re-conveying roller is substantially equal to or slower than the sheet conveying velocity of the conveying roller.
摘要:
An image forming apparatus and method which can take a countermeasure against a tail or the like in consideration of differences of various conditions such as a kind of transfer paper and the like is provided. The apparatus has an image processing portion for extracting an image pattern whose image information has a concentration of 100% and executing a thin-out process for thinning out a predetermined area in the extracted image pattern at a predetermined ratio. The image processing portion or step changes the thin-out process according to the transfer paper kind.
摘要:
An output of a DC high voltage source is supplied as a bias to a heat fixing apparatus. An output of the DC high voltage source is divided by resistors, and a divided output is supplied as a DC bias to a charging apparatus. A feedback circuit generates a feedback signal corresponding to a difference between the divided output and a reference voltage, for supply to the DC high voltage source thereby controlling the divided output voltage at a desired value. Such structure allows a supply of a bias voltage to the heat fixing apparatus higher than the bias voltage to the charging apparatus, thereby eliminating defects in the fixing apparatus such as a fixation tailing or an offset phenomenon. Also the charging apparatus can be given an exactly controlled bias voltage, thereby avoiding a halftone density unevenness resulting from an uneven charging.