Abstract: A clutch transmission mechanism of a printing device includes a power input shaft, a power input gear, a gear-shifting arm, a first gear-shifting module and a second gear-shifting module. In the cooperation of these components and modules, the printing device can be operated in a first gear-shifting mode or a second first gear-shifting mode. When the printing device can be operated in a first gear-shifting mode or a second first gear-shifting mode, the clutch transmission mechanism coaxially transmits the driving force. As such, the stability of transmitting the driving force is enhanced.

Abstract: The present invention discloses a duplex document feeder for installed in scanning devices such as facsimile machine, printer, scanner or multi function peripheral (MFP). The duplex document feeder can control the motion accuracy of the sheet and avoid the happening of jam. The duplex document feeder includes a pick-up module, a sheet-controlling roller module and a an ejection module. The pick-up module is used for feeding the sheet into a first feed channel; the sheet-controlling roller module provides a first nip force to feed the sheet outside the duplex document feeder and provides a second nip force to feed the sheet into the interior of the duplex document feeder again; the ejection module provides a third nip force to feed/eject the sheet into/from the duplex document feeder.

Abstract: The present invention provides a removable input tray to be used in an image forming device, such as a printer. The input tray includes a front wall with a sloped surface for sheet separation, an opening in the front wall, and a retractor pivotally mounted in the opening. The retractor is movable between a stopping position and a retracted position, the stopping position provides a stop to the leading edge of a stack of media sheets when the stack is being inserted into the input tray, and the retracted position is triggered when the input tray is fully inserted into the image forming device.

Abstract: The present invention relates to a document-feeding device. The document-feeding device includes a sheet-feeding channel and a sheet-separating structure. The sheet-separating structure includes a base, a separation pad, a pinch roller, a separation roller and an elastic element. The base is disposed in the sheet-feeding channel. The separation pad is disposed on a surface of the base. The pinch roller is disposed in the base. The separation roller is in contact with the separation pad and the pinch roller. The elastic element is used for supporting the base such that the separation pad and the pinch roller are sustained against the separation roller.

Abstract: The present invention relates to an automatic document feeder having a mechanism for releasing paper jam by disconnecting the transmission device. The automatic document feeder includes a driving motor, a transmission device, a plurality of paper transfer rollers, a swing arm and a releasing arm. The driving motor is used for providing driving power. The transmission device and is coupled to the driving motor for transmitting the driving power. The swing arm is coupled to some of the transmission elements and operated in either a connection state or a disconnection state. The releasing arm is selectively contacted with the swing arm to have the swing arm enter the disconnection state or separated from the swing arm to have the swing arm enter the connection state. The paper jam is released when the swing arm is operated in the disconnection state.

Abstract: The present invention relates to an ejecting roller assembly for use in an automatic document feeder to adaptively adjust the nip force between the follower roller and the driving roller in response to input and output of the paper sheet, there effectively preventing the paper sheet from getting jammed. The ejecting roller assembly includes a swing lever, a follower roller, a friction-generating element and a driving roller. The swing lever is coupled to the follower roller for adaptively adjusting the nip force. The friction-generating element is arranged between the swing lever and the follower roller for facilitating increasing the friction force between the swing lever and the follower roller. The driving roller is used for controlling input and output of the paper sheet.

Abstract: The present invention relates to a document-feeding device. The document-feeding device includes a sheet-feeding channel and a sheet-separating structure. The sheet-separating structure includes a base, a separation pad, a pinch roller, a separation roller and an elastic element. The base is disposed in the sheet-feeding channel. The separation pad is disposed on a surface of the base. The pinch roller is disposed in the base. The separation roller is in contact with the separation pad and the pinch roller.

Abstract: The present invention relates to an ejecting roller assembly for use in an automatic document feeder to adaptively adjust the nip force between the follower roller and the driving roller in response to input and output of the paper sheet, there effectively preventing the paper sheet from getting jammed. The ejecting roller assembly includes a swing lever, a follower roller, a friction-generating element and a driving roller. The swing lever is coupled to the follower roller for adaptively adjusting the nip force. The friction-generating element is arranged between the swing lever and the follower roller for facilitating increasing the friction force between the swing lever and the follower roller. The driving roller is used for controlling input and output of the paper sheet.

Abstract: The present invention relates to an automatic document feeder having a mechanism for releasing paper jam by disconnecting the transmission device. The automatic document feeder includes a driving motor, a transmission device, a plurality of paper transfer rollers, a swing arm and a releasing arm. The driving motor is used for providing driving power. The transmission device and is coupled to the driving motor for transmitting the driving power. The swing arm is coupled to some of the transmission elements and operated in either a connection state or a disconnection state. The releasing arm is selectively contacted with the swing arm to have the swing arm enter the disconnection state or separated from the swing arm to have the swing arm enter the connection state. The paper jam is released when the swing arm is operated in the disconnection state.

Abstract: The present invention discloses a duplex document feeder for installed in scanning devices such as facsimile machine, printer, scanner or multi function peripheral (MFP). The duplex document feeder can control the motion accuracy of the sheet and avoid the happening of jam. The duplex document feeder comprises a pick-up module, a sheet-controlling roller module and a feeding/ejecting module. The pick-up module is used for feeding the sheet into a first feed channel; the sheet-controlling roller module provides a first nip force to feed the sheet outside the duplex document feeder and provides a second nip force to feed the sheet into the interior of the duplex document feeder again; the feeding/ejecting module provides a third nip force to feed/eject the sheet into/from the duplex document feeder.