Raschel Knitting Elongating Device with Teflon Plate
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Solution Overview
Problem
Conventional Raschel knitting machines struggle to produce nets with elongated stitches, as the existing methods for elongating stitches are limited by the stability of the stitch material and result in high friction, which can lead to material breakage and restrict the ability to produce wide nets without significant stretching.
Innovation Solution
An elongating device is integrated into the Raschel knitting machine, featuring an oblong, flexible object with a surface for positioning the stitch and an abutment portion for reciprocating motion, which reduces friction and allows for controlled elongation of stitches by moving the stitch surface during the knitting process, thereby increasing the stitch length without material breakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If conventional Raschel knitting machines are used to produce nets with elongated stitches, then the stitch length can be increased, but the friction on the stitch material increases significantly leading to material breakage
Solution Approach 1:
A Teflon-coated plate is introduced as an intermediary surface between the stitch material and the knitting machine components. The Teflon coating provides a low-friction surface that allows the stitch material to slide easily during the elongation process, significantly reducing friction and preventing material breakage while enabling increased stitch length
Solution Approach 2:
The physical-chemical properties of the contact surface are changed by applying a Teflon coating, which has inherently low friction characteristics. This parameter change (surface friction coefficient) enables the stitch material to be elongated without experiencing excessive friction forces that would cause breakage
2Area of stationary object
If the stitch material is elongated to increase mesh width, then wider nets can be produced, but the material stability decreases leading to breakage
Solution Approach 1:
The Teflon-coated plate serves as a mediator that facilitates material elongation while protecting the material from damage. The low-friction surface allows the material to be stretched to increase mesh width without the high friction forces that would compromise material stability and cause breakage
3Area of stationary object
If additional rows of loops are added to produce extra wide nets, then the net width increases, but the device complexity and production effort increase significantly
Solution Approach 1:
Instead of adding more needles and rows of loops (which would increase device complexity), the invention changes the physical parameters of the existing system by introducing a Teflon-coated plate. This allows the existing machine configuration to produce wider nets through material elongation rather than through structural expansion
Solution Approach 2:
The invention introduces a dynamic element (the Teflon-coated plate that moves with the reciprocating motion) that enables variable net width production without changing the fixed needle configuration. The material can be elongated dynamically during the knitting process to achieve desired width
Data Source
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AI summary
A method, an elongating device, a Raschel knitting machine comprising the elongating device for producing nets with elongated stitches and a net comprising elongated stitches is described. The method comprises the steps of continuously generating new loops for elongating the two rows of loops by additional loops and dragging the rows of loops in a machine direction, generating a first stitch of the weft by joining the weft to a loop of the first row and to a loop of the second row, and positioning the first stitch across a surface of an elongating device for preventing the first stitch from traveling with the warps knitted to loops in the machine direction. The joining is configured for elongating the first stitch by pulling additional weft material, and the surface of the elongating device is carrying out a reciprocating movement towards the first stitch. Further, an elongating device for elongating of the stitches is described.