Circular Knitting Removal Device for Reliable Lateral Loop Transfer
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Solution Overview
Problem
Existing removal devices for tubular knitted manufactures from circular knitting machines suffer from accidental disengagement of loops, structural complexity, radial position errors, and high radial volume, compromising safety and efficiency.
Innovation Solution
A removal device with an annular body supporting removal members, which rotate and move along a parallel and radial trajectory, using locking tabs to stabilize loops, and featuring selective actuation for precise engagement with needles, ensuring high reliability and low radial volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the needle head is inserted in a seat formed in the end of the removal member, then the coupling between removal members and needles is achieved, but the radial volume of the removal device increases and structural complexity increases
Solution Approach 1:
Instead of inserting the needle head into a seat at the end of the removal member (conventional approach), the invention inverts the coupling geometry: the removal member approaches the needle from the side, and the loop is transferred laterally. This eliminates the need for deep axial seats, significantly reducing radial volume while maintaining coupling reliability through a compact lateral engagement mechanism.
Solution Approach 2:
The invention transitions from an axial coupling approach (needle head inserting into end seat) to a lateral/radial coupling approach. The removal member engages the loop and needle from the radial direction rather than from the axial end, changing the dimension of interaction. This dimensional shift reduces radial volume requirements while achieving secure loop transfer.
2Reliability
If a circular annular removal body with parallel removal members is used, then loop transfer is achieved, but the device complexity increases and radial position errors of needles cannot be obviated
Solution Approach 1:
The invention introduces dynamic adjustment capability to the removal device, allowing the removal members to adapt their positions dynamically. This enables the system to compensate for radial position errors of needles during operation, maintaining reliable loop transfer without requiring a complex fixed rigid structure. The dynamic nature allows real-time adaptation to needle position variations.
Solution Approach 2:
The invention employs parameter changes in the positioning system of removal members, allowing adjustment of radial positions to match needle positions. This dynamic parameter adjustment compensates for needle position errors and maintains optimal coupling conditions without increasing overall structural complexity, as only the positioning parameters need to be variable rather than the entire structure.
3Reliability
If removal members are oriented parallel to the axis of the removal body, then loop transfer is achieved, but the radial volume increases
Solution Approach 1:
The invention inverts the orientation approach: instead of orienting removal members parallel to the axial direction with deep seats, the removal members are oriented radially or laterally, engaging the loops from the side. This inversion of the removal geometry dramatically reduces the radial volume required while maintaining effective loop transfer capability.
Data Source
AI summary
A removal device for removing a tubular knitted manufacture from a circular knitting machine for hosiery or the like, comprising an annular removal body which supports a plurality of removal members arranged around the axis of the removal body, which is arrangeable coaxially around the needle cylinder of a circular knitting machine; the removal members are supported by first and second annular portions, which can move by rotation with respect to each other about an oscillation axis in order to pass between a removal condition and a sewing condition, in which the annular portions are arranged so as to face each other, the removal members forming a respective removal head which can move on command along a removal trajectory which has a component that is parallel to the axis of the removal body and at least one radial component away from the axis.