Abstract: A multi-purpose scan device using the same power source includes a flatbed scanner, an ADF, a motor, and a power-switching mechanism. The flatbed scanner has a scanning module and a power transmission mechanism for moving the scanning module back and forth in the flatbed scanner. The ADF has a sheet-feeding mechanism for feeding a document across the scanning module, which scans the document. The power-switching mechanism selectively transmits power of the motor to the sheet-feeding mechanism and the power transmission mechanism.

Abstract: An automatic sheet feeder includes a sheet input tray, first to third passageways, through which sheets may be successively fed, a sheet-feeding mechanism, and a sheet output tray. The first passageway communicates with the sheet input tray, the second passageway selectively communicates with the first passageway, and the third passageway selectively communicates with the first passageway. The sheet-feeding mechanism feeds a first sheet successively from the sheet input tray to the first, second, first, and third passageways. The sheet output tray, in which the sheets are stored, communicates with the third passageway. The front side of the first sheet is toward opposite directions when it passes through the first passageway at the first and second times. When the first sheet is fed to the third passageway, a second sheet is fed to the first passageway.

Abstract: A sheet feeder capable of immediately detecting a paper jam includes a housing, a motor attached to the housing, a driving roller, a driven roller, a rotation speed detector and a control circuit. The motor drives the driving roller to rotate, and the driving roller drives the driven roller to rotate. The driven roller cooperates with the driving roller to feed a sheet therethrough. The rotation speed detector detects the rotation speed of the driven roller and outputs a rotation speed signal. The control circuit receives the rotation speed signal to judge whether or not a paper jam occurs according to the rotation speed signal.

Abstract: A flat-bed scanner in combination with a sheet feeder. The flat-bed scanner includes a first glass window having a top surface and a second glass window having a top surface. A height step is formed without increasing the difficult between the top surfaces of the first and second glass windows. When the sheet feeder is placed on the flat-bed scanner, the scanned documents may pass the first glass window smoothly, consequently, good scanning quality may be obtained.

Abstract: The surface of the glass window of a scanner is coplanar with flanges on top of the scanner frame. The light path between the scan window and the light sensor mounted on the frame is prevented from varying regardless of any interface tolerance in mechanical dimension of the optical components in the light path between the scan window and the light sensor.

Abstract: A calibration mechanism for an optical module of a sheet-fed scanner is disclosed. The calibration mechanism includes a calibration strip and a driving unit. The calibration strip is moved by the driving unit, and the calibration strip may be moved relative to the optical module for calibrating color depth. The driving unit includes a roller and a flexible strip. One end of the flexible strip is mounted to the roller, and the calibration strip is mounted or formed on the flexible strip. The flexible strip is moved by the roller action so that the calibration strip is moved relative to the optical module, and the optical module may accordingly calibrate the color depth.

Abstract: The paper guide for a scanner has an upper guide and two lower guides: the inlet lower guide and the outlet lower guide. The inlet lower guide overhangs over an output lower guide and is separated by a gap in the direction of the paper movement. The paper is scanned at the gap by the scanning light.

Abstract: A document-ejecting/feeding mechanism is assembled inside an automatic document feeder, includes a driving device, gears, one-way clutches and rollers. After feeding action is canceled, the driving device is reversed and cooperates with the action of gears and one-way clutches, and at least one of rollers that near the paper-ejecting position is still rolled to the paper ejecting direction. Therefore, after the feeding action is canceled, the document will be still moved out from the feeder automatically and not tore.

Abstract: A multiple-resolution scanning device introduces an image information obtained by scanning a document into a light folding device and the image information is reflected in the light folding device. The image information comes out from the light folding device and received and reflected by a final reflection mirror unit, and passes through a lens unit and then focused on an optical sensor. By adjusting the light folding device or the final reflection mirror unit, or by adjusting the light source and the light folding device to change the position or angle thereof to achieve the purpose of changing the path of light of the image information and obtain the scanned results having different resolutions.

Abstract: The present invention includes at least one friction member module frictionally and rotatably mounted on a frame. When the friction member module is rotated, the friction between the frame and the friction member module is converted into a torque which is exerted on the frame, so that the frame can be swayed to a paper taking position, thereby facilitating feeding paper automatically.

Abstract: The present invention includes at least one friction member module frictionally and rotatably mounted on a frame. When the friction member module is rotated, the friction between the frame and the friction member module is converted into a torque which is exerted on the frame, so that the frame can be swayed to a paper taking position, thereby facilitating feeding paper automatically.

Abstract: The paper guide for a scanner has an upper guide and two lower guides: the inlet lower guide and the outlet lower guide. The inlet lower guide overhangs over an output lower guide and is separated by a gap in the direction of the paper movement. The paper is scanned at the gap by the scanning light.