Sheet Feeder Residual Pile Bars for Gentle Sheet Handling
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Solution Overview
Problem
Existing sheet feeder systems face a challenge in balancing high operational speeds with secure and gentle handling of sensitive sheets, often risking damage during the process of changing sheet piles.
Innovation Solution
The device allows for independent vertical movement of residual pile bars within a predefined range, enabling them to adapt to the geometry of both the current and replacement sheet piles, minimizing friction and resistance when retracting from the sheet pile region, thus ensuring gentle handling and high operational speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the main pile supporting unit is raised by a distance corresponding to sheet thickness each time a sheet is taken, then the sheet pile changing can be synchronized with sheet feeding, but the operational speed is limited by the mechanical movement requirements
Solution Approach 1:
The residual pile bars are made movable in the vertical direction, allowing them to dynamically adapt their position to the sheet pile geometry rather than being fixed. This dynamic capability enables the system to handle sheets at high speed without being constrained by the movement speed of the main pile supporting unit, as the residual pile bars can independently adjust to maintain proper sheet support during rapid sheet feeding operations
2Reliability
If the residual pile bars are fixed in position, then the device structure is simpler, but the sheets may be damaged due to inability to adapt to imperfect pile surfaces
Solution Approach 1:
The residual pile bars are equipped with vertical movement capability through a positioning mechanism that allows them to adjust their height independently. This dynamic adjustment enables the bars to adapt to variations in sheet pile geometry and surface imperfections, ensuring reliable and damage-free sheet handling without requiring complex overall device restructuring
Solution Approach 2:
The positioning mechanism for each residual pile bar is designed as an independent segment that can be controlled individually or in groups. This segmentation allows for localized adaptation to sheet pile geometry without affecting the entire system, maintaining simplicity while improving reliability
3Productivity
If the residual pile bars are moved horizontally into and out of the sheet pile region, then the sheet pile changing can be performed, but vertical forces and friction may damage delicate sheets
Solution Approach 1:
The residual pile bars are designed to move vertically rather than horizontally when engaging or disengaging from the sheet pile. This vertical movement direction is perpendicular to the sheet surface, allowing the bars to insert and retract with minimal friction and vertical forces, thereby protecting delicate sheets from damage while maintaining high sheet pile changing speed
Solution Approach 2:
The positioning mechanism changes the movement parameter of the residual pile bars from horizontal to vertical direction. This parameter change enables the bars to engage and disengage from the sheet pile in a manner that minimizes harmful friction and vertical forces on the sheets, while still achieving rapid sheet pile replacement
Data Source
AI summary
A device (12) for changing a sheet pile in a sheet feeder (10) for a sheet treating machine is described. The device (12) comprises a main pile supporting unit (18) having a supporting surface (22) adapted to support a pallet (16) carrying a sheet pile. Furthermore, the device (12) comprises a residual pile supporting unit (24) with a plurality of residual pile bars (28), which can be moved into a sheet pile region (30) when the sheet pile is to be changed. The residual pile bars (28) are then carrying the sheet pile. When in the sheet pile region (30), each of the residual pile bars (28) is movable in a direction substantially orthogonal to the supporting surface (22), wherein the residual pile bars (28) are movable independently from each other. Furthermore, a method for changing the sheet pile in a sheet feeder (10) for a sheet treating machine is explained.