Patent ID: 7770881
Filing Date: 2010-08-10
Classification: B65H,H04N

Abstract:
1. A sheet material feeding device, comprising: a sheet material housing part housing a sheet bundle having a plurality of sheet being stacked; a conveying-out unit press-contacting onto the front edge side of the upper surface of the sheet bundle housed in the sheet material housing part to exert a push-out force, feeding a sheet stacked on the upper edge side of the sheet bundle by the push-out force in a predetermined conveying-out direction, and separating the sheet from the sheet bundle; a feeding unit arranged on the downstream side of the sheet material housing part along the conveying-out direction and continuing the feeding of the sheet fed from the sheet bundle by the conveying-out unit in the conveying-out direction; a conveying-out guide part provided between the conveying-out unit and the feeding unit, and being bent in substantially inverted V shape, wherein after the conveying-out unit moves away from the rear edge of a preceding sheet, the conveying-out unit conveys a following sheet in the conveying-out direction in a state that the following sheet is overlapped at the lower side of the preceding sheet until the front edge of the following sheet reaches a predetermined guide position set between the sheet bundle and the feeding unit, and the conveying-out unit continues driving after the rear edge of the preceding sheet moves away from the conveying-out unit and until the front edge of the following sheet reaches the predetermined guide position; wherein the conveying-out unit has a nudger roll press-contacting a roll surface onto the front edge side of the upper surface of the sheet bundle housed in the sheet material housing part and rotating in a normal rotation direction corresponding to the conveying-out direction to exert the push-out force onto the sheet bundle, and a roll-driving control part controlling rotation of the nudger roll, the roll-driving control part starts rotating the nudger roll in the normal rotation direction to convey out the sheet from the sheet bundle, and stops rotating the nudger roll when the front edge of the following sheet reaches the guide position; wherein the feeding unit has a feed roll press-contacting a roll surface onto the upper surface side of the sheet fed from the sheet bundle by the nudger roll and rotating in a normal rotation direction corresponding to the conveying-out direction to convey the sheet; and a retard roll press-contacting a roll surface onto the lower surface side of sheet fed from the sheet bundle by the nudger roll and the roll-driving control part controls rotation of the nudger roll in the normal rotation direction so that a linear velocity of the roll surface of the nudger roll is slower than a linear velocity of the roll surface of the feed roll.