Abstract: An image reading apparatus and an image forming apparatus including the same to improve a transferring path of a document to prevent curl from being generated in the document and to prevent interference between a document having both surfaces scanned and a previously discharged document. The image reading apparatus includes a scan path having one end connected to a document supplying unit and the other end connected to a document discharging unit, a scan unit to read information recorded on a document passing through the scan path, a two-sided document branch path to branch from the scan path so that the document whose first surface is scanned by the scan unit passes through the two-sided document branch path before the document is reversed for a two-side scanning process, and a two-sided document transferring path having one end connected to the two-sided document branch path and other end connected to the scan path.

Abstract: In an automatic original conveying device, a motor rotates in a single direction and a driving force transmission mechanism transmits the driving force of the motor from a sheet feeding roller to a switchback roller. The sheet feeding roller conveys an original that stands by in a switchback conveying path to a second conveying path. A sorting unit sorts the original conveyed from a paper delivery path to an original delivery table or to the switchback conveying path. The switchback roller is provided between the sorting unit and the switchback conveying path and it is rotatable in a normal direction or a reverse direction.

Abstract: An image reading device and an image forming apparatus and methods thereof can achieve a duplex scanning operation and enable a user to easily arrange the scanned documents after being discharged. The image reading device may include a supply path coupled to a document supply port, a simplex document feeding path coupled to the supply path to first guide the document to the scan unit, a duplex document feeding path coupled to the supply path to second guide the document to the scan unit to scan a first surface of the document, and a duplex document circulating path to communicate with the duplex document feeding path and guide a second surface of the first surface scanned document to the scan unit.

Abstract: A printing apparatus comprising: a printing section including a conveyer, a reconveyer, and a printer; a sensor; a determination section; and a controller. The determination section determines whether a pair of the first sheet and the second sheet is eligible for the high-speed duplex printing based on the combination of the length of the first sheet and the length of the second sheet before the second sheet conveyed by the reconveyer. The controller controls the printing section to convey the first sheet and the second sheet to the reconveyer when the pair of the length of the first sheet and the second sheet is eligible for the high-speed duplex printing, and controls the printing section to eject at least one of the first and the second sheet when the pair of the length of the first and the second sheets is not eligible for the high-speed duplex printing.

Abstract: An image forming apparatus includes an image forming unit configured to form an image onto each sheet, an ejection unit on which the sheet is ejected, a sorting unit configured to sort the sheets ejected on the ejection unit into subsets, and a control unit configured to, when executing a mode for forming images on first sides of the sheets, ejecting the sheets with the images on the first sides, and forming images on second sides of the ejected sheets manually placed on a feeding unit for second-side image formation, control the sorting unit to sort the ejected sheets after first-side image formation into subsets so that the number of sheets in each subset does not exceed a maximum number of sheets stackable on the feeding unit.

Abstract: A recording apparatus includes a recording portion for recording an image on a recording sheet; feeding means for feeding the recording sheet through the recording portion, wherein in a both-side recording operation, a sheet inclination rectifying operation in a recording sheet feeding direction is carried out when the recording is effected on a first side of the recording sheet, and the sheet inclination rectifying operation is not carried out when the recording is effected on a second side of the recording sheet.

Abstract: A modular duplexing housing for an all-in-one device which may be added at a final stage of assembly in order to convert a simplex printing unit into a duplex printing and duplex ADF scanning unit. The modular duplexing unit includes a duplexing feedpath which may be positioned for feeding communication with a simplex printing feedpath in the all-in-one device. The modular duplexing unit may also comprise a secondary input tray in feeding communication with the simplex printing unit and duplexing ADF scanning unit.

Abstract: An image reading apparatus includes a feeding unit, a conveying unit, a primary stacking unit, a secondary stacking unit, and a path switching unit. The path switching unit switches between a first conveying path including a bend section for normal conveying mode and a second conveying path for reverse conveying mode. In the normal conveying mode, the conveying unit conveys a sheet fed from the feeding unit to the primary stacking unit through the first conveying path. In the reverse conveying mode, the conveying unit conveys a sheet fed from the primary stacking unit to the secondary stacking unit through the second conveying path bypassing the bend section.

Abstract: In a printing device, the conveying mechanism has a first path from a accommodating unit to the printing position and a second path that conveys the sheet that has once passed through the printing position to the printing position in an inverted state. The controller controls the conveying mechanism to perform an automatic duplex print. Printing on the one side is executed by using the first path and printing on the another side is executed by using the second path. The another side printing error disables printing of an image, by using the second path, on the another side of the sheet, whose one side has already been printed. When the another side printing error occurs, the controller controls the conveying mechanism to convey, through the first path, a sheet and controlling the printing unit to print the image on the sheet based on the set of image data to be printed on the another side.

Abstract: A duplex printing instruction is accepted. When duplex printing is performed in accordance with the single-side printing and duplex printing is performed for a job of one page is decided in accordance with a condition.

Abstract: An image reader includes a lamp that irradiates light onto a document, a first carriage that moves the lamp along the document to optically scan the document, a CCD that receives light reflected from the document and prepares an image data indicative of an image of the document. A size sensor detects a length of the document in an auxiliary scanning direction, and an IPU that detects a length of the document in the main scanning direction from the image data. A CPU monitors whether a size of the document has changed, based on the detected by the size sensor, and controls irradiation of the light by the lamp based on the result of monitoring.

Abstract: A system and method for achieving registering of side 1 and side 2 images includes sensing marks on both sides of a web with a single IOWA sensor and relying on light transmission through paper to sense side 1 marks. Side 1, the side not facing the IOWA sensor utilizes increased contrast (black toner), mark width, and repeats in order to make effective image “show through.” The image of the marks on both sides of the sheet is compared with respect to each other and adjustments to some combination of position, timing, and image magnification are made as required.

Abstract: In order to build a convenient printing environment which can meet various needs associated with double-sided printing (e.g., a reduction of the load on the operator) from users upon double-sided printing and can cope with the POD environment, a user request associated with a double-sided printing job to be executed by a printing system which includes a printing apparatus that can execute a double-sided printing operation is accepted from the user via a user interface unit. When the user request accepted via the user interface unit is a specific user request, the printing apparatus is controlled to execute a series of double-sided printing operations using a function of adjusting a printing position of data to be printed on one of first side and second side of a printing medium in the double-sided printing job to be processed.

Abstract: An image forming apparatus and a driver for the image forming apparatus are provided. The image forming apparatus includes: a first communication section configured to receive print data; a printing section configured to perform a duplex printing including printing N sheets on first sides thereof and subsequently printing M sheets on second sides thereof, wherein M is equal to or smaller than N; a setting section configured to set the value of N; and a control section configured to control the printing section to perform the duplex printing in accordance with the value of N set by the setting section. The value of N may be set based on a communication speed of the print data when acquired by the acquisition section.

Abstract: A method for forming a color image that allows a color image forming device to detect print chromaticity by an actually used print medium and automatically perform an optimal color balance adjustment in consideration of the chromaticity of the print medium. At a first step of the method, it is determined whether a feeder is selected for a subsequent printing operation. If selected, the process proceeds to a second step. If not selected, it is determined that the printing operation is not performed for some time and the process is completed without color balance adjustment. At the second step, a print medium for printing a test pattern is fed from the feeder selected for a subsequent printing operation, which is determined at the first step. A color sensor detects the chromaticity of the test pattern transferred and fused on the print medium, and the color balance is then adjusted.

Abstract: A method and related apparatus for inverting receivers in a plurality of physically coupled print engines by using an inverter such that one or more images are digitally printed on designated receiver sheets whereby all receiver sheets that can be inverted are inverted and those that cannot be inverted are not inverted. A skip frame is added to the first print engine preceding each noninvertible receiver sheets.

Abstract: A paper conveying apparatus and method for flipping paper includes a paper feeding roller that can rotate in a positive direction or in a reverse direction, a motion transfer member that has one end coupled with the paper feeding roller, and a paper depressing element coupled with another end of the motion transfer member to be driven and rotated. The method of flipping paper includes: first, feeding a sheet of paper into a first paper conveying path; next, depressing the paper into a second paper conveying path while the paper is leaving the first paper conveying path; and reentering the paper from the second paper conveying path into the first paper conveying path upside down.

Abstract: A printing apparatus for performing a printing operation includes an image forming portion for forming an image on a surface of a sheet according to image data; a discharge portion for discharging the sheet with the image formed thereon with the image forming portion; a reverse transportation unit for returning the sheet discharged with the discharge portion into the printing apparatus to reverse the sheet, so that another image is formed on another surface of the sheet according to image data; a detection unit for detecting the sheet discharged with the discharge portion when the sheet is pulled out before the reverse transportation unit returns the sheet; and a control unit for controlling the image forming portion to form the image on another sheet according to the image data when the detection unit detects that the sheet is pulled out.

Abstract: A duplex automatic document feeder includes first, second, third, and fourth paths, an ejecting path, a scanning module, first and second reversing roller units, a feeding tray, and an ejecting tray. A document is moved from the feeding tray to the scanning module for scanning of a first side surface thereof. Subsequently, the document is moved along a second-side scanning path defined by the first reversing roller unit, the third path, a portion of the first path, the fourth path, and the first reversing roller unit to allow for scanning of a second side surface thereof. After the first and second side surfaces are scanned, the document is moved along a document-inverting path defined by the second reversing roller unit, a portion of the fourth path, the ejecting path, a portion of the second path, the first reversing roller unit, and the ejecting tray.

Abstract: An original transporting device includes: an original placing portion; an original discharging portion; a first transport path that connects the original placing portion and the original discharging portion; a second transport path that is branched from the first transport path and is connected to a switchback transport path; a changeover unit that changes over a transport route along which an original is transported to either one of the first transport path and the second transport path; a first detecting unit that detects the presence or absence of the original; a first determining unit that determines whether or not the original is a final page original based on the detection; and a controlling unit that controls a transporting unit and the changeover unit so as to discharge at least a portion of the final page original to outside the device through the second transport path based on the determination.

Abstract: An image reading apparatus including: first reading sensor to read an image of an original document at a first position; a second reading sensor at second position downstream; a circulating transport path; a first switchback provided between the first and second positions; a second switchback provided between the second and first positions; a first gate at a branching point of the first switchback; a second gate at a branching point of the second switchback; a sheet exit; a third gate provided at a branching point of the sheet exit; and a controller, which controls such that: the original document is transported through two switchbacks, both face images are read by the two reading sensors; and in another mode, the original document is transported through one of the two switchback sections, and both face images are read by one of the two reading sensors.

Abstract: An image forming system is given, in advance, unique setting as a behavior to be performed when an error occurs regarding postprocessing. In a case where the postprocessing becomes inexecutable during the operation of the system, the system either cancels the postprocessing to continue printing (Steps S20, S22) or stops printing to generate an error (Step S18), based on the unique setting. A user arbitrarily decides the unique setting, which enables optimum control of the operation that the system should perform when the postprocessing becomes inexecutable.

Abstract: A sheet conveying apparatus according to the invention includes a first conveying path; a sheet reverse conveying portion; a second conveying path; a third conveying path; and a movable guide portion configured to guide the conveyed sheet. The guide portion is moved to a position where the sheet can pass when the sheet is guided from the first conveying path to the second conveying path, and the guide portion is moved to a position where the guide portion guides the sheet to the third conveying path while blocking between the first and second conveying paths such that the sheet can not intrude from the second conveying path into the first conveying path when the sheet conveyed by the sheet reverse conveying portion is conveyed in the second direction.

Abstract: A duplex printing apparatus includes a paper input tray, a first paper ejecting tray, a second paper ejecting tray, multiple additional roller assemblies, a first paper feeding channel, a second paper feeding channel, a laser printing module, an inkjet printing module, a first paper pick-up roller, a second paper pick-up roller assembly, and a controlling circuit. The first paper ejecting tray and the second paper pick-up roller assembly are arranged between the laser printing module and the inkjet printing module. Since a buffering zone is created to prevent interference between the laser printing operation and the inkjet printing operation, the possibility of causing bent or wrinkled papers from differential moving speeds is largely reduced.

Abstract: An image reading apparatus that includes: a document delivering unit; a switchback delivering unit that pulls a document into a switchback delivery path extended to an opening formed on an external surface of an apparatus housing from a predetermined position of the document delivery path; an image reading unit that reads an image of the document delivered to a reading position of the document delivery path; and a control unit that delivers a document inserted into the opening of the switchback delivery path to the reading position by the switchback delivering unit and the document delivering unit, thereby reading an image in a second image reading operation to be carried out by temporarily stopping a first image reading operation.

Abstract: Methods are presented in which one or more pages of a print job are segmented into two or more parts, with the first part being transferred and affixed to the printed medium prior to transferring and affixing the second part, in order to facilitate high TMA (pile height) printing while mitigating adverse retransfer, blur, fusing, and hollow character effects.

Abstract: A duplex document feeder includes a housing unit, and a switching unit. The housing unit has a document-conveying path, an inverting path, and a switchback path. The switching unit is disposed in the switchback path, and includes a first switching gate, a second switching gate connected fixedly to the first switching gate, and a guiding path disposed between the first and second switching gates. The switching unit is pivotable among first, second, and third positions so as to allow for automatic feeding, two-sided scanning, inverting, and ejecting in orderly arrangement of documents.

Abstract: An image reading apparatus and an image expansion and contraction correcting method are provided that improve the quality of each read image by restraining image expansion and contraction caused by a variation in the combination of conveying units for conveying each document. The image reading apparatus has conveying units (a first conveying unit, a second conveying unit, and a third conveying unit) that convey each document, and an image reading unit (a first image reading unit and a second image reading unit) that reads an image of each document being conveyed by the conveying units. The image reading speed of the image reading unit is adjusted in accordance with a change in the combination of conveying units that are conveying a document, so as to correct image expansion and contraction caused by a change in document conveying speed caused by the change in the combination of conveying units.

Abstract: According to one aspect of this disclosure, a printing apparatus and method is provided. The printing apparatus comprising a media sheet first inverter and a media sheet second inverter, the first inverter and second inverter operatively connected to provide a media sheet pass-through route, wherein the media sheet pass-through route transports a media sheet through the first inverter and the second inverter. According to another aspect of this disclosure, a printing system is disclosed. The printing system comprising an inverter module. The inverter module comprising a first media sheet input/output zone, and a second media sheet input/output zone, the first and second media sheet input/output zones operatively connected to provide a media sheet pass-through route. The inverter module is configured to selectably route a media sheet to a printing device for image transfer and the inverter module is configured to invert a media sheet from the printing device media sheet output.

Abstract: A printing apparatus that is capable of performing two-sided printing, includes: a sheet determining unit that determines whether a sheet size that has been instructed is smaller than a predetermined standard; a one-sided/two-sided determining unit that determines whether one-sided printing or two-sided printing has been instructed; and a printing/feeding control unit that, in a case where the sheet determining unit has determined that the sheet size is smaller than the predetermined standard and the one-sided/two-sided determining unit has determined that two-sided printing has been instructed, selects short-edge feeding for performing feeding of a sheet having an orientation in which short edges of the sheet are perpendicular to a feeding direction in the printing apparatus and performs printing on the sheet.

Abstract: An image forming apparatus using a thermal printing head (TPH) and a printing method thereof to print a borderless image on both sides of a printing medium. The image forming apparatus includes first and second feeding units respectively disposed at front and rear sides of the TPH to transfer the printing medium at a predetermined printing speed and a pair of out-feed rollers that co-rotates and feeds out the printing medium, in which one of the out-feed rollers rotates in contact with the pick-up roller. A platen roller co-rotates in contact with the printing medium fed by the first and second feeding units The TPH has a printing position in which the TPH is pressed towards the platen roller to form a printing nip, and an open position in which the TPH is separated from the platen roller. The knock-up plate has a pick-up position where the printing medium comes in contact with the pick-up roller and a stand-by position where the printing medium loaded thereon is separated from the pick-up roller.

Abstract: There are provided a platen on which an original is mounted, a line sensor that performs photoelectric conversion on light from the original on the platen, a first carriage that moves along the platen and guides the light from the original to the line sensor, a first housing that stores and supports the first carriage to be movable along the platen, first driving means for moving the first carriage, a second carriage provided with a plurality of rod-shaped light-source lamps that applies light to the original, a second housing that stores and supports the second carriage to be movable along the platen and covers the platen, second driving means for moving the second carriage, and control means for controlling the first driving means, the second driving means and lighting of the plurality of light-source lamps.

Abstract: A method for scanning a media sheet with a scanning apparatus includes feeding the media sheet through the first set of rollers into a scanning area, such that a first portion of the media sheet is available for scanning. A first partial media sheet image of the first portion is scanned. The media sheet is fed into the second set of rollers, then out of the first set of rollers, such that a second portion of the media sheet is available for scanning. A second partial media sheet image of the second portion of the media sheet is scanned. At least the first partial media sheet image is combined with the second partial media sheet image to generate a full image of the media sheet. In a further embodiment, the number of partial scans may be increased as necessary to provide a complete image of the scanned object, e.g., the media sheet. For example, one or more intermediate scans may be performed in accordance with the present invention in addition to the scans occurring at the ends of media sheet.

Abstract: A printer is operable for image formation onto a sheet of a sheet width Lp, with a sheet spacing Lg and a printing transfer speed Vg, a constant speed transferrer makes sheet transfer at the printing transfer speed Vg from a register via the printer to a speed change position, a variable speed transferrer makes sheet transfer from the speed change position to the register, and a transfer controller controls sheet transfer speeds, the variable speed transferrer having sections for sheet transfer, including deceleration and acceleration sections for sheet reversal at the sheet reversing path, and a constant speed section for transfer at a constant transfer speed Vr, the transfer controller determining a circulating sheet number N, executing a calculation of transfer speed Vr employing sheet width Lp, sheet spacing Lg, printing transfer speed Vg, and accelerations, to enable sheet transfer for circulation within a time interval of N×(Lp+Lg)/Vg.

Abstract: An image forming apparatus includes a reading unit which reads a document image, a detecting unit which detects a document direction representing whether a sub-scanning direction in reading the document image is a short side or a long side direction of an original document, a designating unit which designates, as a copying function, a form for copying the document image on a sheet, an editing unit which edits the read document image as an image corresponding to the designated copying function, a copying unit which copy the edited image on the sheet, and an acquiring unit which acquires a sheet direction representing whether a conveying direction of the sheet conveyed to the copying unit is the short side or the long side direction of the sheet. The editing unit executes processing on the document image on the basis of the document direction, the sheet direction, and the designated copying function.

Abstract: In a multi-stage scanning method for increasing a scanning speed and enhancing an image quality, an optical module is firstly moved from a start position to a forward-internal position in a forward direction, and then enabled to scan a first portion of a document to obtain a first image until the module reaches a forward-boundary position. Then, the module is moved from the forward-boundary position to an end position in the forward direction. Next, the module is moved from the end position to a reverse-internal position in a reverse direction, and then enabled to scan a second portion of the document to obtain a second image until the module reaches a reverse-boundary position. Then, the module is moved from the reverse-boundary position to the start position, in the reverse direction, and then stopped. Finally, the first and second images are stitched into a complete image.

Abstract: The present invention realizes resource saving and energy saving by grasping and managing a usage efficiency of an image forming apparatus. To accomplish this, a method in accordance with the present invention is an information processing method of managing usage information on a job which is issued from an information processing apparatus to an image forming apparatus, which includes: a step of acquiring the usage information from the information processing apparatus or the image forming apparatus; a step of deriving the number of logical pages and the number of physical sheets from the usage information acquired in the acquisition step; and a step of outputting usage efficiency information of the image forming apparatus using the number of logical pages and the number of physical sheets derived in the derivation step.

Abstract: A duplex color printer includes a body defining a plurality of docking bays for receiving color ink cartridges; a pair of print engines mounted within the body in an opposed manner to define a print media feed path therebetween, each print engine comprising at least one printhead coupled in fluid communication with the color ink cartridges; a pair of print media trays mounted on either side of the body for respectively containing print media; a print media feed arrangement configured to feed print media from one of the trays, along the print media path during a printing operation carried out by the print engines and into the other one of the trays; and an internal hard drive for storing page description language (PDL) files and rasterized page images.

Abstract: A duplex printer includes a pair of print engines, each print engine comprising at least one printhead and one transfer roller for receiving ink ejected from the at least one printhead; a pair of print media trays provided upstream and downstream of the pair of print engines, each print media tray comprising a movable platen for supporting a stack of print media and a motorized mechanism for moving the platen; and a print media feed arrangement for feeding print media from one of the pair of print media trays to the other of the pair of print media trays along a print media feed path. The transfer rollers of the pair of print engines are provided opposite each other with respect to the print media feed path.

Abstract: In a document feeder, a driving control unit feeds a document by a switch-back feeding unit, guides again the document from a document feed path to a bidirectional feed path, and then discharges the document from the document feed path to a document discharging section, when the feeding of the document is in a double-sided scanning feeding mode and in a status during first side feeding. The driving control unit feeds the document by the switch-back feeding unit and then discharges the document from the document feed path, when the feeding of the document is in the double-sided scanning feeding mode and in the status during second side feeding. The driving control unit discharges the document from the document feed path without feeding the document in the switch-back manner, when the feeding of the document is in the double-sided scanning feeding mode and after the second side feeding.

Abstract: A first and second printing engine are disposed with an intermediate transport belt in U-shaped arrangement. The method employs printing sheets serially on one side in the first engine inverting the sheet and transporting the sheets through about 180° change in direction without rotation. The commonality of the leading edge is thus maintained before and after inverting. The sheet is then fed to the second engine for duplex printing on the second side of the sheet. The second engine may have a media sheet input rotation for simplex printing serially with the duplex printing.

Abstract: A document reader includes a document feeder conveying a document along a document conveyance path, a first image reader reading an image formed on a first side of the conveyed document, and a second image reader reading an image formed on a second side of the conveyed document. Each of the first and second image readers is of an optical reduction system constituted of a light source, a mirror, a lens and an image sensor. The second image reading means is unified into a single assembly including at least the mirror, the lens and the image sensor, to be thus detachably attached, as a single unit, to the document feeding means. Thus, the document reader can clearly read the images formed on the first and second sides, it requires a short period of time from image reading to image outputting, and its maintenance is readily conducted.

Abstract: An image forming apparatus includes a medium transporting mechanism. A first transporting section transports a recording medium on which an image is formed. A second transporting section receives the recording medium from the first transporting section and then further transports the recording medium. The second transporting section has a smaller transporting force than the first transporting section. A controller controls the second transporting section in such a way that the second transporting section transports the recording medium at a higher speed than the first transporting section.

Abstract: In one embodiment of the invention, in an image forming apparatus that reverses the front and back of recording paper by performing switchback transport of the recording paper to perform duplex printing of the recording paper, the image forming apparatus is provided with a control means that, when performing duplex printing of the recording paper, forms a void area at a leading end and a trailing end of the recording paper, the void area preventing curling of the recording paper around a roller.

Abstract: An image reading apparatus includes a first reading part which reads a first side of a document, a second reading part located on a document discharge path which reads a second side of the document with an image sensor, a path narrowing member positioned across from the image sensor on the document discharge path; and an adjusting unit, wherein the adjusting unit adjustably moves the path narrowing member closer to and farther away from the image sensor in order to correspondingly move the document closer to and farther away from the image sensor. The image reading apparatus is capable of increasing reading speed when a one-side reading of a document is performed as well as minimizing any damage done to data produced by the reading when a double-side reading of a document is performed.

Abstract: A duplex printing apparatus is equipped with: a first printing section for printing on first sides of sheets; a storage section for storing a plurality of the sheets, the first sides of which have been printed on; a second printing section for printing on second sides of the sheets; a first conveying section for sequentially conveying the sheets, the first sides of which have been printed on, to the storage section; and a second conveying second for sequentially conveying the plurality of sheets which are stored at the storage section to the second printing section. The storage section is equipped with a holding mechanism that holds the plurality of sheets, the first sides of which have been printed on, in an overlapped state with predetermined intervals therebetween.

Abstract: Method for printing pages within a booklet to improve the appearance of images on opposing pages includes sequencing images such that opposing pages are printed with the same print engine and/or fused the same number of times. Booklets include opposing pages having images fused the same number of times and/or printed with the same print engine as the image on the opposing page.

Abstract: A productivity module for increasing duplex throughput of a first print engine is disclosed. The productivity module has a second print engine, a controller, and an inverter. The controller is configured to receive one or more timing signals from the first print engine and synchronize timing of the second print engine with the first print engine based at least in part on the timing signals received from the first print engine. The inverter has an input paper path having an entrance configured to accept one or more receiver sheets from the first print engine; an output paper path having an exit configured to supply the one or more receiver sheets to the second print engine; and an inversion paper path having an entrance coupled to an exit of the input paper path and an exit coupled to an entrance of the output paper path.

Abstract: The invention provides an image reading apparatus includes a feeder that feeds a sheet, a transfer path on which the sheet fed by the feeder is transferred, a first reading unit that captures a first image on a first face of the sheet from one side of the transfer path to obtain first image data, a second reading unit that captures a second image on a second face of the sheet from the other side of the transfer path to obtain second image data, and a correction unit that substantially equalizes image density of the first image data and that of the second image data in a case where the first image and the second image are captured at a single transfer of the sheet through the transfer path.

Abstract: A double side scanner module which consists of a U-shaped inversion device and two image information reading devices is provided for reading images on the two sides of an original in a single pass. The U-shaped inversion device has two ends for providing a paper feeding path and a paper output path respectively. The two ends are at the same side for the convenience of operation. At both of the two ends, there is a glass window. Beneath each of the glass windows, there is an image information reading device. When an original is fed into the paper feeding end and conveyed through the first glass window, the first image information reading device starts to read the image on the first side of the original. When the original is conveyed through the U-shaped inversion device, the scanned side will be inverted to the other side.