Dynamic Velocity Control for Fold-Enhancing Rollers
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Solution Overview
Problem
Conventional sheet processing apparatuses face challenges in improving productivity and energy efficiency during fold-enhancing of saddle-stitched booklets, as they often operate at constant velocities and currents, leading to increased moving time and power consumption.
Innovation Solution
A sheet processing apparatus with a pressing member and a moving unit that adjusts its velocity and current settings to optimize fold-enhancing, starting at a lower velocity and current at one end of the bundle, releasing pressure after passing through, and then increasing velocity and current at the other end during backward movement, thereby reducing moving time and power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If constant velocity control is used during fold-enhancing, then the moving mechanism is simple to control, but the moving time is extended and productivity is reduced
Solution Approach 1:
The patent applies dynamic velocity control by varying the moving velocity according to the pressing load conditions. The velocity is set to a first velocity when pressing load is high (at bundle ends) and a second velocity when pressing load is low (at bundle center), optimizing both productivity and damage prevention
Solution Approach 2:
The patent changes the velocity parameter dynamically during the fold-enhancing process. The control unit adjusts the moving velocity based on the position of the bundle, implementing higher velocity at low-load areas and lower velocity at high-load areas to minimize total processing time while preventing damage
2Device complexity
If constant current control is used during fold-enhancing, then the driving motor control is simple, but unnecessary electric power is consumed and energy saving performance is reduced
Solution Approach 1:
The patent implements dynamic current control that adjusts the driving current according to the pressing load. The control unit sets a first current when pressing load is high and a second current when pressing load is low, reducing energy consumption while maintaining adequate pressing force
Solution Approach 2:
The patent dynamically adjusts the current parameter based on operational conditions. The control unit varies the driving current throughout the fold-enhancing process, using higher current at bundle ends where more force is needed and lower current at the bundle center, optimizing energy efficiency
3Productivity
If high velocity is maintained throughout the fold-enhancing process, then productivity is improved, but impact on the bundle and roller damage increase
Solution Approach 1:
The patent applies different velocity qualities to different spatial locations of the bundle. The first velocity (lower) is applied when the pressing member is at the bundle ends where impact damage is concerning, while the second velocity (higher) is applied at the bundle center where less damage occurs, achieving localized optimization
Solution Approach 2:
The patent dynamically adjusts velocity based on the pressing conditions at different positions. The control unit monitors the position and adjusts the velocity in real-time, reducing velocity when high impact risk is detected at bundle ends and increasing velocity when safe to do so at the bundle center
Data Source
AI summary
A sheet processing apparatus includes: a pressing member that presses a fold part of a bundle of folded sheets so as to perform fold-enhancing; and a moving unit that moves a pressing position of the pressing member in a direction of a fold of the bundle of sheets. The moving unit starts pressing at an area located inside one end of the bundle of sheets while moving at a first velocity, and releases the pressing after passing through other end of the bundle of sheets during a forward movement, and starts pressing at an area located inside the other end of the bundle of sheets while moving at a second velocity that is higher than the first velocity, and passes through the one end of the bundle of sheets during a backward movement.