Media-sheet conveying unit constant velocity
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Solution Overview
Problem
Conventional media-sheet post-processing systems face bottlenecks in speedup due to the need to suspend sheet conveyance during the up or down movement of retaining members, which reduces processing efficiency.
Innovation Solution
A media-sheet post-processing apparatus with a conveying unit that maintains a constant difference between the conveyed sheet amount and the movement amount of the conveying unit, ensuring constant linear velocity and eliminating waiting times during movement, thereby enhancing processing speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the retaining member is moved up or down to press the set of sheets at the trailing end portion, then the sheets are stacked without fail, but sheet conveyance must be suspended during the movement period
Solution Approach 1:
The patent applies dynamics by making the conveying unit movable in the conveying direction while maintaining constant linear velocity. The conveying unit moves upstream during the retaining member's movement and then returns downstream, allowing continuous operation without suspension. This dynamic adjustment resolves the contradiction by enabling the system to adapt its position while maintaining reliable stacking through the retaining member's pressing action.
Solution Approach 2:
The patent implements continuity of useful action by ensuring the sheet conveying unit operates continuously without suspension. The unit moves upstream during the retaining member's upward movement, then returns downstream, maintaining constant linear velocity throughout. This continuous operation eliminates waiting time while the retaining member performs its stacking function, resolving the contradiction between reliability and productivity.
2Speed
If the conveying unit moves upstream during retaining member movement, then constant linear velocity is maintained, but the conveying unit must return downstream afterward
Solution Approach 1:
The patent applies dynamics by implementing a conveying unit that can move in both upstream and downstream directions while maintaining constant linear velocity. The unit moves upstream during the retaining member's movement, then returns downstream, requiring dynamic control of the conveying mechanism. This resolves the speed requirement while accepting increased operational complexity.
Solution Approach 2:
The patent applies preliminary action by having the conveying unit move upstream in anticipation of the retaining member's movement, then return downstream after the stacking operation. This preliminary positioning allows the system to maintain constant velocity and prepare for the next operation, resolving the speed requirement while managing the complexity through planned motion sequences.
Data Source
AI summary
A media-sheet post-processing apparatus performs post-processing on a media sheet delivered thereto. The sheet media post-processing apparatus includes a media-sheet conveying unit configured to convey a media sheet while moving in a media-sheet conveying direction; and a move drive unit configured to move the media-sheet conveying unit in the media-sheet conveying direction in such a manner that a difference between an amount that the media sheet is conveyed by the media-sheet conveying unit and an amount that the media-sheet conveying unit is moved is kept constant.