Abstract
A mechanism of leaning blade squeaking due to the friction between the photoreceptor drum and the blade in a copy machine are presented. Although this problem has been known for many years, the details of oscillation mechanism are not clarified, so we have not found out the fundamental solution method yet. Here, in order to clarify this oscillation mechanism, we took notice of the feature of the oscillation that the frequency changed discretely with a normal force of the blade. In other words, we found out that the oscillation is caused by couple of immanent modes in the cleaning blade, and it was, dependent on a friction force which mode became unstable coupling. As a result, we confirmed that the discrete change of oscillation frequency was explained by the unstable coupled modes of the cleaning blade.
