Patent application number | Description | Published |
20080308999 | Sheet feeding device - According to an aspect of the present invention, there is provided a sheet feeding device including: a tray holding sheets; a chamber having an opening and generating a negative pressure thereinside; a suction belt that suctions and conveys a first sheet from the sheets and that is configured to be rotatable along with the chamber and deformable into a concave shape along with the opening; a regulating member disposed inside the opening to regulate a concaving amount of the suction belt; a sheet gate disposed in a sheet feeding passage to be opposed to the suction belt and configured to retreat when contacted by the suction belt; and a nozzle that blows air toward the sheet and toward the suction belt. | 12-18-2008 |
20090184454 | SHEET POST PROCESS DEVICE WITH STAPLER MECHANISM - A sheet post process device with a stapler mechanism includes a conveying path configured to convey a sheet on which an image is formed to the stapler mechanism; a first sensor disposed along the conveying path and configured to detect a moving position of the sheet; and a tray in which the sheets are stacked to undergo a stapling process; and a rotary cam having a spiral shape disposed at a conveying path outlet through which the sheet is ejected from the conveying path to the tray. When the sheet passes through the conveying path outlet, the cam rotates and comes into contact with the sheet to move the sheet to the tray. | 07-23-2009 |
20100221041 | PHOTOCONDUCTIVE DRUM AND IMAGE FORMING APPARATUS HAVING THE SAME - A disclosed photoconductive drum includes a mechanism where, when the sleeve inner circumferential surface pressing member is in contact with the inner circumferential surface of the photoconductive sleeve member, a displacement of the first end surface member with respect to the photoconductive sleeve member in the center line direction leads to increasing a pressing force applied from the sleeve inner circumferential surface pressing member to the inner circumferential surface of the photoconductive sleeve member. | 09-02-2010 |
20120087703 | Cooling device and image forming apparatus - A cooling device includes: a cooling roller that cools down a sheet-like member by coming into contact with the sheet-like member; a belt member that is rotatably extended by a plurality of extending members, presses the sheet-like member against the cooling roller, and holds and carries the sheet-like member; and a driving roller that serves as one of the plurality of extending members and drives to rotate the belt member, wherein the driving roller is axially divided into a plurality of rollers and each of the plurality of rollers has a crown-like shape whose outer diameter continuously becomes larger from both end parts to a center part in an axial direction. | 04-12-2012 |
20120291299 | SHEET LENGTH MEASURING DEVICE AND IMAGE FORMING APPARATUS - A sheet length measuring device includes a rotating body configured to rotate with a movement of a sheet in a conveying direction; a position detecting unit configured to detect leading and trailing ends of the sheet passing through a position of the rotating body; a measuring unit configured to measure a rotation amount of the rotating body and output an origin signal per one revolution of the rotating body; a storage unit configured to store changes of a sheet conveying amount with respect to respective rotation angles in one revolution of the rotating body; and a calculating unit configured to calculate a corrected length of the sheet from a value obtained from a rotation angle of the rotating body when the leading end of the sheet is detected and a value obtained from a rotation angle of the rotating body when the trailing end of the sheet is detected. | 11-22-2012 |
20130049296 | SHEET CONVEYING APPARATUS AND IMAGE FORMING APPARATUS - A sheet conveying apparatus including: a sheet conveying unit; an upstream side guiding member that forms an upstream side conveying route of a sheet; a downstream side guiding member that forms a downstream side conveying route of the sheet; an upstream side detection unit; and a downstream side detection unit, wherein a detection position of the sheet for the upstream side detection unit is set between the sheet conveying unit and a position where the sheet is in contact with the upstream side guiding member, and a detection position of the sheet for the downstream side detection unit is set between the sheet conveying unit and a position where the sheet is in contact with the downstream side guiding member. | 02-28-2013 |
20130195482 | SHEET CONVEYING APPARATUS, IMAGE FORMING APPARATUS, SHEET CONVEYING DISTANCE CALCULATION APPARATUS AND SHEET LENGTH CALCULATION APPARATUS - A sheet conveying apparatus includes a sheet conveying unit that conveys a sheet; a conveying amount measuring unit that measures a conveying amount of the sheet conveyed by the sheet conveying unit; a first detection unit that detects the sheet downstream of the sheet conveying unit in a conveying direction of the sheet; a second detection unit that detects the sheet upstream of the sheet conveying unit in the conveying direction of the sheet; and a conveying distance calculation unit that calculates a conveying distance of the sheet based on the measured result by the conveying amount measuring unit and the detected results detected by the first detection unit and the second detection unit. | 08-01-2013 |
20130228969 | SHEET CARRYING DEVICE AND IMAGE FORMING APPARATUS - A disclosed sheet carrying device includes a first carrying unit that includes a first rotary body, a first driving unit outputting a driving force at a first peripheral speed, a one-way clutch transmitting the driving force only in a sheet carrying direction, and a second rotary body driven by the first rotary body via the sheet; and a second carrying unit including a third rotary body rotating at a second peripheral speed being the first peripheral speed or more, a fourth rotary body carrying the sheet with the third rotary body, a second driving unit outputting a driving force for driving the fourth rotary body at a third peripheral speed being the second peripheral speed or more, and a torque limiter having a slip torque smaller than a sheet carrying torque and cutting off the driving force while the sheet is interposed between the third and fourth rotary bodies. | 09-05-2013 |
20130241146 | DEVICE FOR CORRECTING AN EDGE PORTION OF A SHEET MATERIAL AND ELECTROPHOTOGRAPHIC IMAGE FORMING APPARATUS - Disclosed is a device for correcting an edge portion of a sheet material, including a first roller provided in a sheet material conveying path, a second roller including a center shaft and side rollers provided at both sides thereof, the center shaft having an outer diameter less than a minimum diameter of the side rollers, each of the side rollers having an outer diameter increasing from a center side to an outer side thereof, and a pressing unit configured to cause the second roller to bend toward the first roller to press the side rollers of the second roller against the first roller. | 09-19-2013 |
20130251434 | IMAGE FORMING APPARATUS WITH CONVEYANCE SUSPENSION UNIT - An image forming apparatus includes a drive roller configured to rotate, a driven roller configured to hold and convey a print medium at a gap between the drive and driven rollers, an image carrier configured to have a toner image formed on a surface thereof and to rotate, the image carrier being situated downstream relative to the drive roller and the driven roller in a travel direction of the print medium, a transfer roller configured to hold and convey, at another gap between the image carrier and the transfer roller, the print medium passed from the drive roller and the driven roller to transfer the toner image onto a surface of the print medium, and a conveyance suspension unit to stop the drive roller and the driven roller from applying a drive force to the print medium at a time at which the print medium reaches such another gap. | 09-26-2013 |
20140029961 | IMAGE FORMING APPARATUS - An image forming apparatus includes an image forming unit that forms an image on a recording medium; a width detector that detects positions of side edges of the recording medium in a width direction, which is orthogonal to a conveying direction in which the recording medium is conveyed, at multiple detection positions along the conveying direction; a shape calculator that calculates angles between the conveying direction and straight lines each connecting the positions of the same side edge detected at the multiple detection positions and calculates a shape of the recording medium based on the angles; and a correction unit that corrects image data of the image to be formed by the image forming unit based on the calculated shape of the recording medium. | 01-30-2014 |
20140037299 | IMAGE FORMING APPARATUS, IMAGE FORMING METHOD, AND COMPUTER-READABLE RECORDING MEDIUM - An image forming apparatus includes an image forming unit forming an image on a first recording medium based on image data, a measurement unit being positioned in an immediate vicinity of the image forming unit, being arranged upstream of a sheet-conveyance path than the image forming unit, and measuring a size of the first recording medium, an expansion ratio calculation unit calculating an expansion ratio of the first recording medium based on a first size of the first recording medium obtained before the first recording medium is passed through the image forming unit and a second size of the first recording medium obtained after the first recording medium is passed through the image forming unit, and a correction unit correcting the image data used for forming another image on a second recording medium conveyed after the first recording medium based on the expansion ratio. | 02-06-2014 |
20140118762 | IMAGE FORMING APPARATUS - An image forming apparatus includes an image forming unit to form an image on a recording medium; an inverting transport unit to invert first and second surfaces of the recording medium, and front and rear ends of the recording medium to transport the inverted recording medium; a recording medium width measuring unit to measure an end position of the recording medium in a width direction orthogonal to a transporting direction of the recording medium at a measuring position having an approximately identical distance from one end of the recording medium in the transporting direction before and after the image is formed on the recording medium; and a correcting unit to correct an image to be formed on a subsequent recording medium based on a change in a shape of the recording medium computed based on a measured result from the recording medium width measuring unit. | 05-01-2014 |
20140312562 | SHEET CONVEYING APPARATUS AND IMAGE FORMING APPARATUS - A sheet conveying apparatus includes a detecting unit configured to detect a sheet; a conveying unit including a driving roller and a driven roller that rotates in conformity with the driving roller and configured to convey the sheet by holding the sheet between the driving roller and the driven roller; a disk configured to rotate in correspondence with the driven roller and including multiple slits arranged in a periphery thereof; first and second sensors configured to detect the multiple slits and output detection signals, the first and second sensors being provided substantially opposite to each other where a rotational axle of the disk is positioned at a center between the first and second sensors; and a conveyance distance calculating unit configured to calculate a sheet conveying distance based on a detection result of the detecting unit and the detection signals. | 10-23-2014 |
20140348563 | SHEET CONVEYING APPARATUS, IMAGE FORMING APPARATUS, SHEET CONVEYING DISTANCE CALCULATION APPARATUS AND SHEET LENGTH CALCULATION APPARATUS - A sheet conveying apparatus includes a sheet conveying unit that conveys a sheet including a drive roller, a driven roller, and a rotary encoder provided on a rotational axle of one of the drive roller and the driven roller; a conveying amount measuring unit that measures a conveying amount of the sheet; a first detection unit positioned downstream of the sheet conveying unit, the first detection unit being positioned apart from the drive roller and the driven roller not to overlap with the drive roller and the driven roller in the conveying direction; a second detection unit positioned upstream of the sheet conveying unit; and a conveying distance calculation unit that calculates a conveying distance of the sheet based on the measured result by the conveying amount measuring unit and the detected results detected by the first detection unit and the second detection unit. | 11-27-2014 |
20150008639 | SHEET CONVEYING APPARATUS AND IMAGE FORMING APPARATUS - A sheet conveying apparatus includes a sheet conveying unit including a drive roller and a driven roller; a downstream detection unit and an upstream detection unit; a conveying amount measuring unit that measures a conveying amount of the sheet; and a conveying distance calculation unit that calculates a conveying distance of the sheet, wherein a distance between the downstream detection unit and the upstream detection unit or a perimeter of one of the drive roller and the driven roller is set such that an expected conveying distance calculated based on a set sheet length of an expected value of the sheet becomes a substantially integer multiple of a perimeter of the one of the drive roller and the driven roller. | 01-08-2015 |