Circular Knitting Drive Chain With Retracting Butt Protection

The patent applies the dynamics principle by making the first butt movable rather than fixed. The elastic joint allows the first butt to dynamically adjust its position - retracting into the groove when collision risk is detected and extending outward during normal operation. This dynamic capability resolves the contradiction by maintaining structural simplicity while enabling the butt to avoid collision damage through automatic retraction.

The patent implements beforehand cushioning by providing an elastic joint that预先 prepares the system to absorb collision impacts. The elastic joint acts as a cushioning element that can deform to absorb impact energy if collision occurs, and more importantly, it enables the first butt to retract beforehand to prevent collision entirely, thus protecting the system from damage.

The patent applies dimensionality change by utilizing the radial dimension for selection accuracy while maintaining compact overall size. The oscillating lever achieves high selection accuracy through precise angular positioning in the radial direction, allowing accurate needle selection without increasing the axial or tangential dimensions of the drive chain, thus resolving the size-accuracy contradiction.

The patent implements local quality by concentrating the selection accuracy function in the oscillating lever's angular positioning mechanism rather than distributing it throughout the entire drive chain. The oscillating lever is designed with specific local features - the selecting tooth and cam engagement geometry - that provide high precision needle selection while the rest of the drive chain maintains compact dimensions.