Curved Swing Piece Cancel Cam for Knitting Machine Needle Selection
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Solution Overview
Problem
Conventional electromagnetic needle selection apparatuses in circular knitting machines experience wear and friction issues due to concentrated impact and friction when the swing piece contacts the swing piece cancel cam, leading to inaccurate needle selection and reduced operation speed.
Innovation Solution
A main body block for the electromagnetic needle selection apparatus featuring a swing piece cancel cam with two inclined surfaces that approach the opposite plane as the distance from the attracting section decreases in the longitudinal direction, and retract as the distance increases, allowing for surface contact instead of point contact, thereby reducing wear and friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional swing piece cancel cam with a planar surface is used, then the structure is simple, but the swing piece contacts the cam at a single point causing concentrated impact and friction
Solution Approach 1:
The swing piece cancel cam surface is changed from a planar surface to a curved surface that is convex in the lateral direction. This curvature transformation causes the swing piece to contact the cam along a curved line rather than at a single point, distributing the impact and friction across multiple contact points. This resolves the contradiction by maintaining structural simplicity while significantly improving wear resistance and reliability.
2Adaptability or versatility
If the swing piece is allowed to swing freely, then the needle selection can be adjusted, but the swing piece tilts causing reduced attracting force and inaccurate needle selection
Solution Approach 1:
The curved surface of the swing piece cancel cam performs preliminary action by guiding the swing piece into a non-tilted state before the swing piece enters the attracting section. This preliminary correction of the swing piece orientation ensures that the attracting force acts accurately on the attractive portions, resolving the contradiction between swing flexibility and positioning accuracy.
3Stability of the object's composition
If the swing piece returns to non-inclined state over a long distance, then the swing piece can stabilize, but the swing distance is too long causing failure of accurate needle selection
Solution Approach 1:
The curved surface design enables the swing piece to return to its non-inclined state over a shorter distance compared to a planar surface. The curvature provides continuous guidance that progressively corrects the tilt angle, achieving both stability and accuracy within a compact space.
Solution Approach 2:
The cam surface performs preliminary stabilization action during the swing piece's return journey, ensuring the swing piece is properly positioned before reaching the attracting section. This preliminary stabilization eliminates the need for excessive swing distance while maintaining accuracy.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively dissipates impact and friction across the contact surface, reducing wear on both the swing piece and the swing piece cancel cam, enhancing the operation speed and accuracy of needle selection in circular knitting machines.
Implementation Method 1
a magnet member that selectively attracts the attractive portions of the swing piece... constituted of a permanent magnet and two electromagnets connected to both sides of the permanent magnet
Data Source
Figure 1
Figure 2~3
Figure 4A~4B
AI summary
A swing piece cancel cam for an electromagnetic needle selection apparatus S that comprises: a swing piece 6 that is swingably fitted in a swing piece base member, and that has attractive portions 6a, 6b on both end portions in a lateral direction; a main body block 20 having an active surface including attracting sections 4 that attract the attractive portions 6a, 6b by electromagnetically selecting the attractive portions; and a swing piece cancel cam 2 that is provided to the main body block and that guides the swing piece on the active surface toward the attracting section, wherein the swing piece cancel cam on the active surface has two inclined surfaces 51 each inclining to approach the opposite plane as a distance from the attracting section decreases in longitudinal direction Y, and to retract from the opposite plane as the distance from the attracting section increases in longitudinal direction Y, and the two inclined surfaces 51 gradually approaches the opposite plane from the both ends in the lateral direction X towards the center portion.