Sheet Conveying Roller Mounting Guide Mechanism

The roller member is designed with different hardness values at different locations: the portion contacting the sheet has lower hardness (40-60 Shore A) to provide high conveying force, while the portion contacting the torque limiter has higher hardness (70-90 Shore A) to resist wear from opposing torque. This local differentiation resolves the contradiction between durability and conveying force.

The roller member is pre-designed with a specific phase angle (e.g., 45 degrees) relative to its mounting position on the roller shaft. This preliminary phase configuration allows the roller to be mounted without requiring complex alignment operations, as the phase relationship is already established during manufacturing. The roller simply needs to be positioned at the correct angular location on the shaft, significantly simplifying the mounting process while preventing erroneous combinations.

Each roller member is designed with an asymmetric phase angle configuration that corresponds to its specific function and the roller shaft it mounts on. For example, pickup rollers, feed rollers, and retard rollers have different phase angles (e.g., 0 degrees, 45 degrees, 90 degrees respectively). This asymmetric design creates a unique mechanical interface for each roller type, preventing erroneous combination while maintaining exchangeability for adaptability to different sheet types.