摘要:
The present invention enables registration adjustments during actual use of an image forming apparatus. A test pattern is formed on a sheet in a full-color image forming apparatus and the test pattern formed on the sheet is read in an image read unit. From the result of reading the test pattern, misregistrations of vertical and horizontal scaling factors, parallelism, squareness, skew, side registration, and lead registration in the test pattern are determined, and mounting positions, drive timings, drive speeds, and the like of constituent members are adjusted.
摘要:
An image forming apparatus registers both sides of sheets with great precision in a sheet transportation direction in both-side image formation. The image forming apparatus includes: photoconductive drums holding toner images; an intermediate transfer belt temporarily holding the toner images; a secondary transfer roll that transfers the toner images to a sheet in a transfer unit; a registration roll rotating toward the transfer unit being in sheet feeding timing; a fixing unit fixing the toner images transferred to a first side of the sheet; reversion transportation paths reversing the sheet and again transporting the sheet to the transfer unit; a first sensor detecting the image of the first side of the sheet; and a second sensor that detects the toner images held in the intermediate transfer belt.
摘要:
The invention provides a double-faced image formation system that prevents transfer and adhesion of a lubricant to an image retaining conveyer and an intermediate transfer part. The system is provided with, on a return path for reversing and conveying a sheet having toner images fixed on one side thereof, a front face electrifying unit and a rear face electrifying unit. Oil adhered on the rear face of the sheet in a fixation unit by the rear face electrifying unit is electrified to a negative polarity, and the oil adhered on the rear face is made impossible to transfer to an intermediate transfer belt. The oil adhered on the front face of the sheet in the fixation unit by the front face electrifying unit is electrified to a positive polarity, and the oil adhered on the front face is made impossible to transfer to a secondary transfer conveyance belt.
摘要:
The invention provides a double-faced image formation system that prevents transfer and adhesion of a lubricant to an image retaining conveyer and an intermediate transfer part. The system is provided with, on a return path for reversing and conveying a sheet having toner images fixed on one side thereof, a front face electrifying unit and a rear face electrifying unit. Oil adhered on the rear face of the sheet in a fixation unit by the rear face electrifying unit is electrified to a negative polarity, and the oil adhered on the rear face is made impossible to transfer to an intermediate transfer belt. The oil adhered on the front face of the sheet in the fixation unit by the front face electrifying unit is electrified to a positive polarity, and the oil adhered on the front face is made impossible to transfer to a secondary transfer conveyance belt.
摘要:
Image formation condition is available, which hardly causes imperfections of the image quality. A full-color image formation system selects plural secondary transfer conditions in a secondary transfer unit within a specific range, forms test charts according to each of the secondary transfer conditions selected, and prints them out. A user checks by viewing the test charts printed on each recording sheet, and selects a page number of the sheet where the user evaluated an image quality as the best; and the image formation system sets the secondary transfer condition for the sheet as a standard secondary transfer condition thereafter.
摘要:
An intermediate transfer type image forming apparatus is provided, in which a secondary transfer unit includes a secondary transfer member having a contact transfer member disposed in contact with at least the surface of an intermediate transfer medium, a bias applying unit for applying a transfer bias to transfer a toner image on the intermediate transfer medium through the secondary transfer member to a transfer medium and an inverse transfer bias having the opposite polarity to the transfer bias, and a bias switching unit for switching the applied bias of the bias applying unit so that the transfer bias is applied to an image transfer area on the intermediate transfer medium and the inverse transfer bias is applied to an image non-transfer area on the intermediate transfer medium. The apparatus is also equipped with a disturbing member for disturbing (scraping out, sweeping off or the like) toner adhering to the contact transfer member.
摘要:
A tandem type image forming apparatus having plural image forming bodies and an intermediate transfer belt is provided, in which the intermediate transfer belt can be spaced from the image carrying bodies without causing any damage on the intermediate transfer belt. A retracting unit is provided which retracts a belt module along with a secondary transfer module such that a belt-shaped intermediate transfer belt is spaced from all of image carrying bodies.
摘要:
The present invention provides an image forming apparatus. The image forming apparatus includes plural image carriers, an endless intermediate transfer belt, plural first transfer members and a second transfer member. The image forming apparatus starts application of the transfer bias sequentially from the first transfer members disposed upstream and continues to apply the transfer bias to two or more of the first transfer members until the recording medium enters a transfer position where the toner images are transferred by the second transfer member.
摘要:
An image forming apparatus includes an image holding body that holds an electrostatic latent image; a developing device that develops the electrostatic latent image with a toner and forms a toner image on the image holding body; a transfer member having a fluorocarbon resin dispersion layer at least at a surface layer of the transfer member, fluorocarbon resin being dispersed in the fluorocarbon resin dispersion layer; a first transfer device that first-transfers the toner image, which is formed on the image holding body, on the transfer member; a second transfer device that second-transfers the toner image, which is first-transferred on the transfer member, on a recording medium; and an abrading member that is arranged to come into contact with and be separated from the transfer member and abrades part of the surface layer of the transfer member when the abrading member contacts the transfer member.
摘要:
A polyimide film having a polyimide as the primary constituent and containing at least a polymeric electroconductive material, wherein in a weight-decrease vs. temperature-increase curve when the polyimide film is heated gradually from 30° C., a weight-decrease rate at a first inflection point, where an amount of difference in weight-decrease rates decreases first from 30° C., is in the range of −1.9% or more and −1.4% or less.