Strapping Device Height Detection Movable Deflectors
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Solution Overview
Problem
Conventional strapping devices struggle with strapping low stacks of flexible articles like thin sheets or brochures due to instability, leading to deformation or tearing during tensioning, resulting in an elliptical or kinked shape.
Innovation Solution
A strapping device equipped with height-detecting technology and movable strap deflectors that adjust their position and distance to securely tension the strap around low stacks, ensuring stability and preventing deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the strap is pulled back with high restoring force during retensioning, then the strap is tightly wrapped around the packaged goods, but the packaged goods are deformed at the side edges or tear slightly
Solution Approach 1:
The pressing device acts as an intermediary element between the strap and the packaged goods. It distributes the strap tension forces across a larger contact area of the packaged goods top surface, preventing concentration of forces at the side edges that would cause deformation or tearing, while still allowing effective strapping.
Solution Approach 2:
The pressing device changes the force distribution parameter by converting concentrated strap tension into distributed pressure across the packaged goods surface. This parameter change allows the strap to be tensioned effectively without causing localized damage to the packaged goods edges.
2Object-affected harmful factors
If the strap is retensioned with little tension to avoid damaging packaged goods, then deformation is prevented, but the strap is not stretched tightly around the packaged goods and becomes sharply deflected or kinked
Solution Approach 1:
The pressing device serves as a mediator that enables the strap to maintain its shape during retensioning. By providing a stable contact surface on top of the packaged goods, it prevents the strap from becoming sharply deflected or kinked, allowing proper tension to be applied without compromising strap geometry.
3Productivity
If conventional strapping devices are used on low stacks, then the strapping process can be completed, but the strap takes on an elliptical shape and the packaged goods arch following the strap shape
Solution Approach 1:
The pressing device acts as a mediator that maintains the flatness of low packaged goods during strapping. By providing a stable reference surface on top of the packaged goods, it prevents the packaged goods from arching and following the elliptical strap shape, ensuring both strapping completion and flatness are achieved.
Solution Approach 2:
The pressing device changes the geometric parameters of the strapping process by maintaining a flat reference surface. This prevents the formation of elliptical strap shapes and corresponding arching of packaged goods, ensuring flat packaging is maintained throughout the strapping operation.
4Quantity of substance
If the stack height is very low (one or a few millimeters), then only a few sheets or brochures can be strapped, but the instability of the stack makes strapping difficult and results in poor quality output
Solution Approach 1:
The pressing device serves as a stabilizing intermediary for low stacks. By providing a stable contact surface on top of the stack, it compensates for the inherent instability of very thin stacks (one or a few millimeters high), enabling successful strapping of small quantities of sheets or brochures that would otherwise be too unstable to strap effectively.
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
Strapping device for strapping a packaged item, comprising a table receiving the packaged item and a device for inserting and retensioning a strap encircling the packaged item, wherein a device (17) for detecting the height of the packaged item (8) and two table-side provided strap deflections (11) movable below two parallel side edges (12) of the packaged item (8) between a non-working position and a working position, around which the strap (4) is tensioned during retensioning in the working position, wherein the strap deflections (11) can be moved from the non-working position to the working position depending on the detected height of the packaged item (8), and wherein the strap deflections (11) are movable in a direction perpendicular to the direction of movement along which they can be moved between the non-working and the working position.