Dynamic Gap Control for Printer Stack Alignment
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Solution Overview
Problem
Medium transport devices face issues with frictional resistance and alignment failures during saddle-stitching processing, particularly when the number of stacked media increases, leading to transport failures and degraded alignment due to varying medium types and environmental conditions.
Innovation Solution
A medium transport device with a feeding unit, stack portion, alignment portion, and control unit that adjusts the distance between the support surface and opposing surface based on conditions such as medium type, number of stacked media, discharge amount of ink, and environmental factors, ensuring appropriate stacking and alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the interval between the support surface and the opposing surface is wide, then transport failures are suppressed, but the medium may be lifted and alignment is degraded
Solution Approach 1:
The opposing surface is made movable to dynamically adjust the interval distance based on the number of stacked media. When few media are stacked, the surface moves closer to prevent lifting; when many media are stacked, it moves away to reduce friction and enable successful transport.
2Quantity of substance
If the number of stacked media in the stack portion increases, then stacking capacity is improved, but frictional resistance increases and transport may fail
Solution Approach 1:
The system dynamically adjusts the interval distance between the support surface and opposing surface based on the detected number of stacked media. As the number of stacked media increases, the opposing surface moves away to maintain sufficient clearance, preventing excessive frictional resistance and ensuring reliable transport.
3Manufacturing precision
If the interval between the support surface and the opposing surface is narrow, then alignment is improved, but transport failures occur due to increased frictional resistance
Solution Approach 1:
The opposing surface is configured to move dynamically, adjusting the interval distance according to the number of stacked media. This allows the system to maintain narrow intervals for good alignment when needed, while expanding the interval when friction becomes excessive, thereby preventing transport failures.
Data Source
AI summary
A medium transport device includes a feed roller pair, a stack portion that receives a medium transported by the feed roller pair between a support surface for supporting the medium in an inclined posture in which a downstream side in a transport direction is directed downward and an opposing surface opposing the support surface and stacks the medium, an alignment portion that aligns a downstream end of the medium stacked in the stack portion, and a control unit that controls a distance between the support surface and the opposing surface, in which the stack portion is configured to be capable of changing the distance and the control unit adjusts the distance according to a condition.