Sheet Tension Adjustment Using Single Detection Unit
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Solution Overview
Problem
Existing sheet conveying apparatuses face challenges in efficiently setting appropriate tension across multiple conveyance units, leading to increased costs and size due to the need for tension detection units in each unit.
Innovation Solution
A sheet conveying apparatus with a supply unit, a switching unit, a tension applying unit, and a detection unit that adjusts tension and detects it while the sheet is released, allowing for efficient tension setting across multiple sections using a single detection unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a tension detection unit is provided in each conveyance unit, then appropriate tension can be set in each section, but the cost and size of the apparatus increase
Solution Approach 1:
The patent merges multiple tension detection functions into a single detection unit by using a switching unit that sequentially connects different conveyance sections to the detection unit. This allows one detection unit to serve multiple sections, reducing the number of detection units needed while maintaining accurate tension control across all sections.
Solution Approach 2:
The patent employs a dynamic switching mechanism that changes the connection state between conveyance sections and the detection unit based on operational requirements. The switching unit dynamically connects different sections to the detection unit, enabling a single static detection unit to monitor multiple dynamic sections sequentially.
2Reliability
If a tension detection unit is provided in each conveyance unit, then appropriate tension can be set in each section, but the cost of the apparatus increases
Solution Approach 1:
The patent merges multiple tension detection functions into a single detection unit by using a switching unit that sequentially connects different conveyance sections to the detection unit. This allows one detection unit to serve multiple sections, reducing the number of detection units needed while maintaining accurate tension control across all sections.
Solution Approach 2:
The detection unit is designed to perform multiple functions by detecting tension in different conveyance sections at different times through the switching unit. This multi-functional design allows a single detection unit to replace what would traditionally require multiple specialized detection units, reducing overall system cost.
3Measurement precision
If multiple tension detection units are used, then tension can be monitored in all sections, but the apparatus becomes more complex
Solution Approach 1:
The patent employs a dynamic switching mechanism that changes the connection state between conveyance sections and the detection unit based on operational requirements. The switching unit dynamically connects different sections to the detection unit, enabling a single static detection unit to monitor multiple dynamic sections sequentially.
Solution Approach 2:
The switching unit operates periodically to connect different conveyance sections to the detection unit in sequence. This periodic switching allows the detection unit to cycle through multiple sections, achieving comprehensive tension monitoring coverage without requiring simultaneous connection to all sections, thereby simplifying the overall system architecture.
Data Source
AI summary
A sheet conveying apparatus includes: a supply unit for supplying a sheet; a first switching unit disposed on a conveyance path of the sheet and configured to switch between a state of nipping the sheet supplied by the supply unit and a state of releasing the nipping of the sheet; a first tension applying unit disposed on one side of the first switching unit in a conveyance direction of the conveyance path and configured to apply tension to the sheet; and a detection unit disposed on the other side of the first switching unit in the conveyance direction of the conveyance path and configured to detect the tension of the sheet, wherein, in a state where the nipping of the sheet is released by the first switching unit, the first tension applying unit adjusts the tension of the sheet while the detection unit detects the tension of the sheet.