Medium Transport Roller Speed Control for Curved-Path Dust Reduction
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Solution Overview
Problem
Existing medium transport devices face issues with paper dust generation and charging when transporting media through curved portions at high speeds, necessitating reduced speeds which compromises processing efficiency.
Innovation Solution
A medium transport device with a control section that adjusts the rotation speeds of feed and transport rollers to maintain high-speed transport while overlapping subsequent media with preceding media until the leading edge reaches the registration roller, thereby reducing paper dust and charging while maintaining processing speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the medium is transported at a low speed through the curved portion, then paper dust generation and charging are reduced, but the processing speed of the medium decreases
Solution Approach 1:
The transport path is divided into two distinct sections: a first transport path with a curved portion where the medium is transported at a first speed, and a second transport path where the medium is transported at a second speed. This segmentation allows different speed regimes in different spatial zones, reducing paper dust and charging in the curved portion while maintaining high processing speed in the straight portion.
Solution Approach 2:
The transport device dynamically adjusts the speed of the medium based on its position in the transport path. The control section varies the transport speed between the first speed (lower) in the curved portion and the second speed (higher) in the straight portion, optimizing both quality (reducing paper dust and charging) and productivity (maintaining high processing speed).
Data Source
AI summary
A medium transport device includes a feed roller that feeds a medium; a transport roller that transports the medium fed by the feed roller; a registration roller that corrects skew of the medium transported by the transport roller; a transport path extending from the feed roller toward the registration roller; and a control section that rotates the transport roller so as to transport the medium at a first speed and that rotates the registration roller so as to transport the medium at a second speed that is higher than the first speed, wherein the transport path includes a curved portion extending while curving between the transport roller and the registration roller and the control section rotates the feed roller such that a subsequent medium fed next after a preceding medium overlaps the preceding medium until a leading edge of the preceding medium reaches the registration roller.