Gripping Device Pivot Below Working Plane for Sticky Strip
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Solution Overview
Problem
Conventional gripping devices for sticky strip materials, particularly those with textile or steel wires, introduce excessive tension and often result in uncontrolled detachment, leading to inaccurate positioning and edge profiles during cutting and subsequent handling processes.
Innovation Solution
A gripping device with a pivot point arranged below the working plane, utilizing a slotted guide and link mechanism to ensure controlled detachment and precise movement, combined with a non-stick coating for reduced material stress and improved handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pivot point of the gripping strip is arranged above the working plane, then the gripping device can effectively grip the strip material, but increased tension is introduced into the strip material which causes uncontrolled detachment and positioning errors
Solution Approach 1:
The patent inverts the conventional arrangement by placing the pivot point below the working plane instead of above it. This inversion changes the direction of the gripping force vector, allowing the gripping strip to pull the material downward toward the working plane during retraction, thereby eliminating excessive tension and uncontrolled detachment while maintaining secure gripping.
2Strength
If the gripping strip is pivoted about a pivot point above the working plane, then the gripping device can hold the strip material securely, but the strip material adheres undesirably to the gripping strip leading to uncontrolled detachment
Solution Approach 1:
By inverting the pivot point position to below the working plane, the gripping strip's movement direction is reversed. This causes the gripping strip to approach the material from below and release it by moving downward, reducing adhesive contact time and force, thereby minimizing unwanted adhesion and controlled detachment issues.
Solution Approach 2:
The patent changes the geometric parameter of the pivot point position (from above to below the working plane), which fundamentally alters the kinematics and dynamics of the gripping strip. This parameter change modifies the contact mechanics between the gripping strip and strip material, reducing adhesive forces while maintaining adequate holding strength during retraction.
3Productivity
If a conventional gripping device with pivot point above working plane is used, then the gripping device can pull the strip material, but the end of the strip material detaches in an uncontrolled manner resulting in loss of positional accuracy
Solution Approach 1:
The inverted pivot point arrangement below the working plane ensures that the gripping strip moves in a controlled downward arc during retraction. This inversion provides natural guidance for the strip material end, ensuring it follows a precise trajectory and detaches at the correct position and orientation, thereby maintaining high positioning accuracy while enabling effective retraction.
Data Source
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AI summary
The invention relates to a gripping device (6), in particular for a retraction system (1) of a cord cutting machine for processing sticky tape material (46), especially cord material, and a retraction system (1) with such a gripping device (6). The gripping device (6) has a gripping bar (14) and a gripping plate (15), between which a gripping gap (16) is formed, wherein the gripping bar (14) is pivotable about a pivot point (19) relative to the stationary gripping plate (15). In the retraction system (1), the gripping device (6) is attached to a traversing frame (5) which is movable relative to a main frame (2) of the retraction system (1) in a retraction direction (50) running parallel to a working plane (20).To improve the handling of the sticky tape material and to obtain better release from the gripping device, the pivot point (19) of the gripping bar (14) is arranged below a working plane (20) which is defined by a top surface (21) of the gripping plate (15) facing the gripping bar (14).