Stretchable Sheet Discharger Speed Control for Stable Zigzag Stacking
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Solution Overview
Problem
The challenge is to fold and stack a stretchable sheet while it is being conveyed in a stretched state, as rapid shrinkage upon discharge leads to entanglement with the conveyor and prevents stable discharge in a zigzag state.
Innovation Solution
A method and device where the stretchable sheet is conveyed in a stretched state using a conveyance roller, and then the sheet is discharged from a discharger that holds both sides of the sheet, allowing the discharge port to reciprocate and fold the sheet for stacking. The conveyance speed of the discharger is lower than that of the conveyance rollers to manage the sheet's tension.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the stretchable sheet is conveyed by the stretchable sheet discharger while remaining in the stretched state, then the sheet can be discharged in a stretched state, but the sheet rapidly shrinks when discharged, becoming entangled with the conveyor and preventing stable discharge
Solution Approach 1:
The patent applies dynamics by making the conveyance speed variable rather than constant. The conveyance roller adjusts its speed based on the sheet's state: conveying at a first speed when the sheet is stretched, and at a second (lower) speed when the sheet is being folded or may rapidly shrink. This dynamic speed adjustment prevents entanglement while maintaining the ability to convey the sheet in stretched state for folding operations.
Solution Approach 2:
The patent changes the parameter of conveyance speed from a fixed value to a variable parameter with at least two distinct speeds. By switching between a first conveyance speed (for stretched sheet conveyance) and a second conveyance speed (lower speed for folded sheet or rapidly shrinking sheet conveyance), the system adapts to different sheet states, preventing entanglement while maintaining discharge stability.
2Productivity
If the conveyance speed of the stretchable sheet discharger is increased to improve productivity, then more sheets can be processed per unit time, but the sheet rapidly shrinks and becomes entangled with the conveyor
Solution Approach 1:
The system dynamically adjusts conveyance speed based on real-time sheet conditions. During normal stretched sheet conveyance, a higher first speed maintains productivity. When the sheet enters a folding state or risks rapid shrinkage, the system automatically reduces to a second lower speed, preventing entanglement while minimizing disruption to overall productivity.
Solution Approach 2:
The conveyance speed parameter is changed from a single fixed value to a range of values with at least two distinct levels. This parameter change allows the system to optimize for productivity during stable stretched sheet conveyance while switching to a safer lower speed parameter when sheet instability is detected, thus resolving the contradiction between productivity and reliability.
3Reliability
If the stretchable sheet is conveyed at a lower speed to prevent rapid shrinkage and entanglement, then discharge stability is improved, but productivity decreases
Solution Approach 1:
The system employs dynamic speed control where the conveyance roller operates at a higher first speed during stable stretched sheet conveyance to maintain productivity, and automatically switches to a lower second speed when the sheet is folded or at risk of rapid shrinkage to ensure discharge stability. This dynamic adaptation resolves the contradiction by applying the appropriate speed only when needed.
Solution Approach 2:
The conveyance speed parameter is optimized by implementing at least two distinct speed levels. The system uses a higher speed parameter during stable conveyance phases to maximize productivity, and switches to a lower speed parameter during critical phases (folding or rapid shrinkage risk) to ensure discharge stability, thus achieving both high productivity and high reliability through parameter optimization.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows the stretchable sheet to be discharged in a stable state, preventing rapid shrinkage and entanglement, thereby enabling effective folding and stacking while maintaining the sheet's integrity.
Implementation Method 1
a conveyance roller that conveys the stretchable sheet and defines a conveyance speed of the stretchable sheet
Implementation Method 2
the stretchable sheet discharger conveys the stretchable sheet from an introduction port to a discharge port of the stretchable sheet discharger while holding both sides of the stretchable sheet in a first direction
Implementation Method 3
the discharge port of the stretchable sheet discharger reciprocates in the first direction to fold and stack the stretchable sheet discharged from the discharge port of the stretchable sheet discharger
Data Source
AI summary
A method for folding and stacking a stretchable sheet includes a first conveying step in which a stretchable sheet is conveyed in a stretched state to an stretchable sheet discharger using conveyance rollers that define the conveyance speed V1, V2 of the stretchable sheet; and a second conveying step in which the stretchable sheet discharger conveys the stretchable sheet from an introduction port to a discharge port of the stretchable sheet discharger while clamping both sides of the stretchable sheet in the first direction, and the discharge port of the stretchable sheet discharger reciprocates in the first direction to fold and stack the discharged stretchable sheet from the discharge port of the stretchable sheet discharger. The conveyance speed V3 when the stretchable sheet discharger conveys the stretchable sheet is smaller than the conveyance speed V1, V2 when the conveyance rollers convey the stretchable sheet.