Abstract
In a paper feeding system, a contact condition analysis between a pickup roller and a printing paper is needed for a stable feeding operation. Direct observation of the apparent contact area is necessary for better understanding of the contact condition. However a contact microscope technique takes a lot of time. Thus another efficient technique is demanded for observation of contact area. In this paper, it has been confirmed that observation of the all apparent contact area between the pickup roller and a glass plate is possible by using the laser microscope with wide field of view. Then distributions of micro-slip of the pickup roller against the glass plate were observed along with distributions of real contact area. In addition it was revealed that torque, which induced the micro-slip, was proportional to the amount of real contact area.
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