Abstract: A document feeder includes a casing, a sheet pick-up module, a stopper and a swing lever. The casing includes a sheet feeding channel therein. The sheet pick-up module is pivotally mounted above the sheet feeding channel, and movable between a sheet feeding position and a standby position. The stopper is disposed under the sheet feeding channel. The swing lever includes a first end part is pressed down by the sheet pick-up module and a second end part is pressed down by the stopper. When the sheet pick-up module is switched from the sheet feeding position to the standby position, the sheet pick-up module depresses the first end part of the swing lever, so that the stopper is raised by the second end part of the swing lever to be protruded to the sheet feeding channel.

Abstract: A document feeder includes a housing, a sheet pick-up arm and a stopper. The housing includes a sheet feeding path for placing paper sheets thereon. The sheet pick-up arm is movable between a first position and a second position. The sheet pick-up arm has a protrusion structure. The stopper is disposed under the sheet feeding path and includes a pivotal portion and a sheet stop portion. The sheet stop portion has a hooking part corresponding to the protrusion structure. When the sheet pick-up arm is moved to the first position, the protrusion structure is located in the swing track of the hooking part to restrain the swing range of the sheet stop portion. When the sheet pick-up arm is moved to the second position, the protrusion structure is deviated from the swing track of the hooking part to permit free swing of the sheet stop portion.

Abstract: A sheet pick-up device includes a sheet pick-up arm, a driving shaft and a collar. The sheet pick-up arm has a sleeve at the outside surface thereof. The driving shaft is penetrated through the sheet pick-up arm and the sleeve. The collar is sheathed around the driving shaft and includes at least one flexible vane in contact with the inner surface of the sleeve. The height of the flexible vane relative to the outer surface of the collar is greater than the radial distance between the outer surface of the collar and the inner surface of the sleeve.

Abstract: A sheet pick-up device for use in a document feeder includes a driving shaft, a sheet pick-up arm and a spring clutch. The spring clutch includes a spring and a collar. A retractable claw segment is extended from the collar and sheathed by the spring.

Abstract: A document feeder includes a housing, a control lever and a sheet pick-up module. The housing includes a feeding path defined by a first sidewall and a second sidewall. The control lever is mounted on the first sidewall, and includes a pivotal part, a collar and a handle part. The collar is arranged between the pivotal portion and the handle part. The sheet pick-up module includes a driving shaft mounted on the collar and the second sidewall.