Needling Loom Phase Shift Adjustment via Optical Encoders

The patent replaces the purely mechanical toothed clutch adjustment system with a hybrid system that incorporates optical encoders and electronic control. The optical encoders provide precise digital feedback on the angular positions of the shafts, allowing for much finer adjustment precision (0.1 degrees or better) while the toothed clutches maintain the mechanical robustness and load-bearing capability. This substitution of mechanical sensing with optical sensing resolves the contradiction between robustness and precision.

The patent implements dynamic phase shift adjustment capabilities that allow the system to optimize needle movement patterns based on the specific web size and material properties. The independent angular adjustment of the two shafts enables dynamic optimization of the elliptical needle trajectory, allowing larger needle boards to handle bigger webs efficiently without requiring proportionally larger and more complex mechanical structures. The precision control system allows for fine-tuning that reduces mechanical stress on the enlarged components.

The patent replaces high-tooth-count clutch mechanisms with optical encoder-based sensing and electronic control systems. Instead of using 720 or more teeth on clutch gears to achieve 0.1 degree precision, the system uses optical encoders that provide digital feedback on shaft positions, achieving the same or better precision through non-contact sensing. This eliminates the mechanical complexity and manufacturing costs associated with high-precision gear teeth while maintaining the robust toothed clutch structure for load-bearing functions.