Manuscript carrying apparatus and automatic manuscript reading apparatus using same

Abstract

In an embodiment of the present invention, a pickup roller R 1 makes soft contact to an upper surface of a manuscript by being lowered incrementally in four raising-lowering operations S 1 to S 4 in which, when an electromagnetic clutch connects, the pickup roller is lowered, while being rotated, to approach the upper surface of the top manuscript and, when the electromagnetic clutch disconnects, the pickup roller, while stopping to rotate, is raised away from the upper surface of the top manuscript by an amount smaller than a lowering amount. Between an electromagnetic clutch-side engaging portion and a pickup roller-side engaging portion of a torque limiter, an elastic member is arranged that suppresses drive power load fluctuation produced by disconnection / connection of the electromagnetic clutch and applies a biasing force in a direction to raise the pickup roller when the electromagnetic clutch disconnects.

Description

[0001] This application claims priority based on Japanese Patent Application No. 2004-44850 filed in Japan on February 20, 2004. All of its contents are therefore incorporated into this application. technical field [0002] The present invention relates to a document conveying device which, when reading an image, takes out sheet-like originals placed in a stacked state and conveys them one by one. Background technique [0003] Conventionally, as a method of reading a document image, a document fixing method and a document moving method are known. [0004] The original fixing method is to fix the original and scan the image information reading unit (optical unit) to read it, so it is suitable for book originals, thick paper originals, and the like. Also, since the image information reading unit (optical unit) is scanned, there is an advantage that it is easy to improve the reading accuracy. [0005] On the other hand, the document moving method is that the information readi...

AI Technical Summary

Problems solved by technology

Therefore, due to the change in the load of the driving power, a slight delay is caused in the document conveying speed to the document reading unit that reads the document, thereby causing blurred reading of the document in the document reading unit.

Images