Knot Plate Groove Layout to Reduce Binding Wire Breakage
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Solution Overview
Problem
Traditional knot plates in tying machines are prone to breaking due to significant tension and friction forces on the binding wire, leading to inefficiencies and increased risk of wire failure during the tying process.
Innovation Solution
A knot plate designed as a substantially circular disc with two through slots and grooves that guide the binding wire towards the aperture, reducing tension and friction forces by controlling the wire's movement and bending angle, and featuring beveled edges to minimize friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the binding wire is guided to extend above the knot plate during rotation, then the knot formation is achieved, but the binding wire is exposed to significant tension and friction forces that may cause breaking
Solution Approach 1:
The knot plate is segmented into multiple functional zones: an aperture region, radial grooves for wire guidance, and a knurling region. This segmentation allows the binding wire to follow a controlled path through grooves that reduce tension and friction, preventing wire breakage while maintaining knot formation capability
Solution Approach 2:
The invention introduces a vertical dimension by creating grooves that extend into the knot plate body from the surface. The binding wire is guided through these three-dimensional grooves rather than simply extending above the flat plate surface, reducing friction and tension forces during rotation
2Reliability
If the binding wire is guided within grooves towards the aperture, then tension and friction forces are reduced, but the groove depth must be precisely controlled to prevent wire jump-out
Solution Approach 1:
The grooves are designed with specific dimensional parameters: depth between 0.5-2mm and width 0.3-1.5mm. These parameter ranges optimize the balance between wire retention (preventing jump-out) and friction reduction, ensuring reliable wire guidance without excessive manufacturing precision requirements
Solution Approach 2:
The knurling region on the knot plate surface is designed to provide controlled friction that prevents wire jump-out from grooves. What could be considered harmful friction is converted into a beneficial feature that secures wire positioning while the grooves themselves minimize overall tension forces
3Shape
If the binding wire extends above the knot plate, then the knot can be formed, but the knot height becomes larger
Solution Approach 1:
The knot plate features a curved knurling region with specific radius of curvature that guides the binding wire into a compact knot configuration. This curvature constrains the wire to form a smaller, more compact knot with reduced height while maintaining ease of formation during plate rotation
Data Source
AI summary
A knot plate (1) for a tying machine (3) is described. The knot plate (1) is designed as a substantially circular disc, wherein the knot plate (1) comprises: an aperture (5) arranged substantially in the middle of the knot plate (1), wherein the aperture (5) comprises a substantially circular form, and two through slots (7, 9) for receiving of a binding wire (11) arranged in the knot plate (1) substantially on opposite sides of each other in relation to the aperture (5). The knot plate (1) comprises two grooves (13, 15) for receiving the binding wire, wherein each of the two grooves (13, 15) connects one respective through slot (7, 9) of the two through slots (7, 9) with the aperture (5), each of the two grooves (13, 15) ends in the aperture (5) in a direction that coincides with substantially tangential directions of the aperture (5) so that initially the binding wire substantially follows a wall of the substantially circular formed aperture (5). A tying machine (3) comprising a knot plate (1) is also described.