Sheet feeding device for image forming device


PURPOSE: To prevent a double feed and increase the life by detecting an output torque of a motor to apply a torque to a return roller, and controlling the output torque of the motor to be constant based on detected information. CONSTITUTION: A pickup roller 1 is put by its own weight on a sheet P mounted on a supply paper tray 4, and a roller 1 and a feed roller 2 are driven to rotate clockwise, while a return roller 3 receives a torque clockwise by a DC motor 30. The roller 3 is applied to the upper roller 2 through an oscillation member 18 by the spring force of a tension spring 20 at a constant pressure. If the sheet P is put between the rollers 2 and 3, the roller 3 rotates counterclockwise to discharge the sheet P to a guide plate 7. However, if two sheets P are put between the rollers 3 and 3, the roller 3 rotates in the direction to return the sheet P because a friction resistance between the upper and lower sheets is small, and the output torque is reduced. This is detected by a torque detector 40, and the output torque is increased and controlled to be constant, so the paper P is returned. COPYRIGHT: (C)1990,JPO&Japio




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Cited By (6)

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    EP-2202185-A3August 31, 2011Sagemcom Documents SasVorrichtung zur Aufbereitung von Blättern einschließlich zwei Rollen zum Formulartrennen
    FR-2940258-A1June 25, 2010Sagem CommDispositif de traitement de feuilles comportant deux rouleaux deliasseurs.
    JP-2006119488-AMay 11, 2006Sanyo Electric Co Ltd, 三洋電機株式会社Case and cabinet into which the case fits
    JP-4606120-B2January 05, 2011三洋電機株式会社ケース及び該ケースが嵌まるキャビネット
    JP-H06124929-AMay 06, 1994Enya Syst:Kk, 株式会社エンヤシステムウエ−ハのスタンピング装置
    US-7334788-B2February 26, 2008Fuji Xerox Co., Ltd.Sheet feeder for feeding recording sheets while separating these