Sheet Transport Device Speed Synchronization Control
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Solution Overview
Problem
In large-capacity sheet transport systems, maintaining consistent sheet transport speed across different sections is challenging, particularly when transitioning from a lower speed to a higher speed, which can cause sheet skewing and creasing due to differing transport roller speeds and configurations.
Innovation Solution
A sheet transport device with a controller that manages the transport speed of rotating members, including a registration roller that stops and then resumes transporting the sheet for positional correction, and uses sheet position detectors to synchronize speed changes, ensuring smooth transition from a lower speed to a higher speed without causing creases or skewing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the transport speed is increased from a lower speed to a higher speed, then the productivity is improved, but sheet skewing and creasing occur due to differing transport roller speeds
Solution Approach 1:
The registration roller performs preliminary positional correction on the sheet at low speed before the speed increase. The controller detects when the leading edge of the sheet reaches the registration roller and delays the speed increase until positional correction is complete, preventing skewing and creasing during the transition.
Solution Approach 2:
The sheet position detector provides feedback to the controller about the sheet's position and the transport speed. The controller uses this feedback to determine the optimal timing for increasing speed, ensuring the sheet is properly aligned before the speed change occurs.
2Productivity
If the transport speed is increased without synchronization, then the productivity is improved, but mechanical complications and creasing occur
Solution Approach 1:
The system uses the sheet position detector and controller to automatically synchronize speed changes without requiring external intervention or complex mechanical synchronization mechanisms. The registration roller self-adjusts its speed based on feedback from the sheet position detector.
3Adaptability or versatility
If multiple transport rollers operate at different speeds, then the sheet transport flexibility is improved, but sheet creasing occurs at speed transition points
Solution Approach 1:
The registration roller acts as an intermediary between the first and second transport rollers. It receives the sheet from the first roller at low speed, performs positional correction, and then transfers the sheet to the second roller after speed synchronization, preventing creasing at the transition point.
Data Source
AI summary
A sheet transport device includes first to third rotating members, a sheet position detector, and a controller. The first member transports a sheet at a first speed. The second member transports the sheet at a second speed that is lower than the first speed. The third member in a stopped state receives the sheet and subsequently resumes transporting to perform positional correction thereon. The detector detects positions of leading and trailing edges of the sheet. The controller performs control such that, when a preset time elapses after the detector detects that the leading edge has reached the third member, the third member is caused to resume transporting at the second speed, and when the detector detects that the leading edge has passed the second member, the third member is increased in speed from the second speed to the first speed.