Sheet-fed dunnage apparatus with movable feed guide
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Solution Overview
Problem
Existing dunnage apparatuses face challenges in efficiently feeding and crumpling paper substrates, particularly with rolls, which can lead to paper spilling and require manual intervention, and struggle to provide consistent crumpled paper for packaging due to the need for precise control and cutting mechanisms.
Innovation Solution
A dunnage apparatus featuring a paper feeder and crumpling device that feeds individual sheets or groups of paper in an overlapping arrangement, with a drive roller and movable feed guide to accommodate varying stack thickness, and crumpling mechanism with upstream and downstream engagement elements to create transverse crumples, allowing for precise crumpling and efficient production of low-density packaging dunnage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If rolls are used to feed paper substrate at high speed, then productivity is improved, but paper spilling occurs and control precision deteriorates
Solution Approach 1:
The invention transitions from continuous roll feeding to discrete sheet feeding, segmenting the continuous paper flow into individual sheets. This allows precise control of each sheet's entry into the crumpling zone while maintaining high throughput by processing multiple sheets in sequence, thereby resolving the contradiction between speed and control precision.
Solution Approach 2:
The invention employs a movable feed guide that dynamically adjusts its position to accommodate varying stack heights. This dynamic adjustment mechanism ensures precise feeding control across different operating conditions, maintaining manufacturing precision while supporting high productivity through automated sheet-by-sheet processing.
2Manufacturing precision
If braking mechanism is used to control roll unwinding speed, then paper feeding control is improved, but device complexity increases
Solution Approach 1:
The invention extracts and eliminates the complex braking mechanism from the system by replacing it with a simpler sheet-by-sheet feeding approach. Each sheet is individually fed and crumpled, removing the need for speed control mechanisms entirely, thus reducing device complexity while maintaining precise feeding control.
Solution Approach 2:
The system uses the weight and momentum of the paper stack itself to drive the feeding process, eliminating the need for external braking mechanisms. The natural gravity and mass of the stacked sheets provide the necessary control, simplifying the overall device structure while maintaining precise feeding accuracy.
3Manufacturing precision
If cutting mechanism is added to control paper length, then manufacturing precision is improved, but device complexity and loss of time increase
Solution Approach 1:
The invention performs the cutting action preliminarily by feeding complete sheets into the crumpling zone rather than cutting continuous roll material. The sheet length is predetermined and consistent, eliminating the need for complex cutting mechanisms while maintaining precise length control. The sheets are prepared in advance at the required dimensions.
4Manufacturing precision
If hand crumpling paper is used, then manufacturing precision of crumpled shape is improved, but productivity deteriorates
Solution Approach 1:
The invention replaces manual hand crumpling with an automated mechanical crumpling system. The crumpling zone uses controlled mechanical forces to transform flat sheets into crumpled dunnage, maintaining the quality and consistency of hand-crumpled paper while dramatically increasing productivity by processing multiple sheets continuously.
Solution Approach 2:
The system changes the physical parameters of the crumpling process by controlling the force, speed, and geometry of the crumpling zone. These parameter adjustments enable the machine to replicate the effective crumpling action of hands while operating at high speed, thus maintaining manufacturing precision while improving productivity.
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
The apparatus enables precise feeding and crumpling of paper sheets, producing consistent low-density dunnage that effectively protects products during transport and storage, improving efficiency and reducing manual labor in production lines.
Implementation Method 1
a drive roller positioned to engage a sheet on the surface of the stack for feeding the sheets
Implementation Method 2
a crumpling device configured for crumpling sheets of a substrate to produce low-density packaging dunnage
Data Source
AI summary
The preferred embodiment of a dunnage apparatus includes a crumpling device configured for crumpling sheets of paper to produce low-density packaging dunnage. A paper feeder is provided to feed feeding sheets of paper into the crumpling device for crumpling.