Patent application number | Description | Published |
20080253785 | IMAGE FORMING APPARATUS AND IMAGE FORMING METHOD - An image forming apparatus capable of reducing damage in a fixing section and printing a high-quality image on a sheet at low cost without reducing productivity. A sheet shifting mechanism is arranged upstream of a transfer roller and moves the sheet in a sheet lateral direction orthogonal to the sheet conveying direction. In order to change a position at which a sheet passes through a fixing roller, the sheet shifting mechanism is controlled for every conveyance of a predetermined number of sheets, whereby sheet movement in the sheet lateral direction is controlled. A correction amount for an error due to sheet shifting by the sheet shifting mechanism is stored for each of sheet shift positions. An image forming position in the sheet lateral direction of a photosensitive drum is shifted on the basis of the sheet shift position and the stored correction amount. | 10-16-2008 |
20080253818 | IMAGE FORMING APPARATUS AND CONTROL METHOD THEREFOR - An image forming apparatus that can satisfy productivity at the time of double-sided image formation without jamming due to a collision of a succeeding sheet with a preceding sheet, and without upsizing of the apparatus. The image forming apparatus performs a sheet circulation transport for circulating and transporting a sheet to an image forming unit to perform image formation on both a first side and a second side of the sheet. The sheet is fed to the image forming unit at a predetermined image formation start timing for the first side image formation. The first side image-formed sheet is reversed, and re-fed to the image forming unit for the second side image formation while causing the first side image-formed sheet to wait at least one of sheet waiting positions. A full state where all the sheet waiting positions are full of the first side image-formed sheets is detected. The sheet feeding unit is controlled so that the number of sheets on which the sheet circulation transport is performed is greater than the number of the sheet waiting positions. When the full state detecting unit detects the full state, the sheet re-feeding unit is controlled so that a head sheet among the first side image-formed sheets waiting at the sheet waiting positions is fed in advance of the predetermined image formation start timing. | 10-16-2008 |
20090267288 | SHEET FEEDING APPARATUS, SHEET FEEDING METHOD AND CONTROL PROGRAM - A sheet feeding apparatus provided with a fan for blowing air against sheets stacked on a sheet tray, a position detecting sensor for detecting the position of the sheets floated up by the fan, and a tray lifting and lowering mechanism for lifting and lowering the sheet tray. The tray lifting and lowering mechanism is controlled on the basis of a result of detection by the position detecting sensor. | 10-29-2009 |
20100007922 | IMAGE FORMING APPARATUS, CONTROL METHOD THEREFOR, AND PROGRAM FOR IMPLEMENTING THE CONTROL METHOD - An image forming apparatus which is capable of bringing processing devices, such as sheet feed devices and post-processing devices connected respectively to the image forming apparatus, into operable states in timing optimal for carrying out an image forming job, thereby improving productivity and operation rate of the image forming apparatus as well as saving energy. A print job is analyzed to determine at least one sheet feed device and at least one post-processing device to be used in executing the print job, and states of the determined devices are checked to determine at least one of the sheet feed device and the post-processing device to be caused to start a preparatory operation in advance before the print job is executed. Power supply to the at least one of the sheet feed device and the post-processing device is turned on in timing such that the preparatory operation is completed in time for the start of execution of the print job. | 01-14-2010 |
20110085839 | IMAGE FORMING SYSTEM AND CONTROL METHOD FOR THE SAME - An image forming system comprises a selection unit for selecting a post-processing apparatus that executes post-processing to a recording medium on which an image is formed from among a plurality of post-processing apparatuses, and a selection limitation unit for determining an insertion apparatus whose supply of the insertion medium to be limited for a selected post-processing apparatus and limiting selection of the insertion apparatus. | 04-14-2011 |
20110133386 | SHEET CONVEYING SYSTEM, CONTROL METHOD THEREFOR, CONTROL PROGRAM FOR IMPLEMENTING THE METHOD, AND STORAGE MEDIUM STORING THE PROGRAM - A sheet conveying system which is capable of preventing a jammed sheet from being mixed with processed sheets, reducing waste in sheets and toners, and further alleviating the user's operations, when jamming has occurred during passing of a sheet between respective sheet conveying devices of upstream and downstream apparatuses. A puncher control section of a puncher as an upstream apparatus of the system issues a passing completion notification as to the passing of a sheet to a staple stacker control section of a staple stacker as a downstream apparatus of the system. Upon reception of the notification, when the staple stacker control section determines that the parameter of auxiliary information of the notification indicates an abnormal discharge of the sheet from the puncher, the staple stacker stops the conveyance of the sheet. | 06-09-2011 |