JPS6451961A - Cut sheet feeder - Google Patents

Abstract

PURPOSE:To enable stable feed of paper always regardless of a change in environment by constituting a separation protrusion with a protruding part with a plurality of steps which have different overriding forces. CONSTITUTION:A separation protrusion 30 consists of a plurality of steps with different overriding forces, e.g. two-step separate protruding parts 30-1, 30-2. The overlapping value of the separate protruding part to a feeder roller 2 is set by providing a less overriding force R for a first step protruding part 30-1 than that R for a second step separation protruding part 30-2. When the environmental conditions are low temperature and low humidity, the sheet (such as postcard) 1 is firm, so that it can easily be separated by one piece, even if its overriding force to the first step 30-1 is small. When the environmental conditions are high temperature and high humidity, the postcard is not firm and therefore, its coefficient of friction is large. Consequently, even if more than two pieces of sheet passed through the first step 30-1, the first sheet alone is separated in the second step 30-2 to perform precise paper feed, because its overriding force to the second step 30-2 is larger than that to the first step 30-1. Even when the environmental conditions ranging from low temperature, low humidity to high temperature, high humidity change significantly, stable separation feed performance of paper can be maintained.