Blank Feeding Aligning Belts for Curvature Control
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Solution Overview
Problem
The existing methods for feeding blanks to machines for further processing, such as in the production of packets, face issues with unwanted curvatures in the stack due to axial thrust, especially with recycled cardboard or uneven blanks, leading to unpredictable pickup and potential damage.
Innovation Solution
A device with compensating and aligning belts that maintain constant thrust and shape the blanks to ensure precise pickup, using pneumatic suction and adjustable feed speed to counteract stack height variations and reduce bulges, along with movable stop elements to control the release of blanks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the stack of blanks is fed under its own weight to the pickup device, then the blanks are automatically advanced along the feed direction, but unwanted curvatures (bulges) occur in the stack especially at the leading end
Solution Approach 1:
A leveler element is introduced as an intermediary component between the stack and the pickup device. This leveler element actively counteracts the curvature by applying a leveling force to the leading end of the blanks, thereby mediating between the gravitational feed and the pickup operation to maintain blank flatness.
Solution Approach 2:
The leveler element applies a preliminary counteracting force to prevent the curvature from developing or worsening. By continuously acting on the leading end of the blanks to maintain them in a substantially horizontal position, the leveler prevents the harmful curvature effect before it interferes with pickup reliability.
2Reliability
If elastic pushing elements are used to urge the stack towards the pickup device, then the stack is advanced reliably, but the axial thrust creates unwanted curvatures in the blanks
Solution Approach 1:
The leveler element serves as a mediator that decouples the pushing function from the curvature problem. It allows the elastic elements to provide reliable axial thrust while the leveler independently manages the blank shape by applying counteracting leveling forces at the leading end.
Solution Approach 2:
The feeding system is segmented into distinct functional zones: the elastic pushing elements handle axial advancement, while the leveler element specifically addresses the leading end curvature. This segmentation allows each component to perform its specialized function without interfering with the other.
3Productivity
If the stack height is reduced by picking up blanks one by one, then the pickup operation can proceed continuously, but the varying stack height causes variable thrust and unpredictable blank curvature
Solution Approach 1:
The leveler element provides continuous feedback control by sensing the position and curvature of the leading end of the blanks and adjusting its leveling action accordingly. This feedback mechanism compensates for variations in stack height and thrust, maintaining consistent blank flatness throughout the continuous pickup process.
Solution Approach 2:
The leveler element is designed to be dynamic and adaptive, adjusting its leveling force in real-time as the stack height changes. This dynamic response ensures that the blank curvature is compensated regardless of the varying thrust conditions caused by different stack heights.
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 solution ensures reliable and precise pickup of blanks by maintaining constant thrust and flattening the stack, reducing the risk of damage and improving process reliability by minimizing curvatures and ensuring uniform pushing action.
Implementation Method 1
The device comprises a compensating belt and associated pneumatic suction means configured to advance the stack towards the stop element
Implementation Method 2
The device comprises at least two aligning belts in succession, configured to come into local contact with an outfeed end stretch of the stack of blanks so as to ensure that each blank of the outfeed end stretch is progressively shaped
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A device for feeding blanks (100) to a packing machine, comprising feed means (2) for feeding a stack (P) of blanks (100) and at least one stop element (4, 4a) configured to retain the stack (P) of blanks (100), wherein the feed means (2) comprise at least one aligning belt (14) acting on an outfeed end stretch (P2) of the stack (P) of blanks (100) and configured to come into local contact with the blanks (100) of the outfeed end stretch (P2) in such a way as to ensure that each blank (100) is progressively aligned with a positioning plane, specifically by localized acceleration or deceleration.