Shoe Last With 3D Surface Components for Spray Forming

The patent applies the inversion principle by using a last with three-dimensional structural surface components that are reversed or inverted to create the upper. The last includes protrusions and recesses that correspond to the desired upper features, allowing the upper to be formed by depositing material onto the last and then inverting the structure. This enables intricate designs to be created efficiently without requiring complex multi-step manufacturing processes, thereby improving both manufacturing precision and productivity

The patent implements self-service by designing the last with integrated three-dimensional structural surface components that automatically define the upper's intricate features during the deposition process. The last's protrusions and recesses self-align and self-form the corresponding upper features without requiring human intervention or complex tooling adjustments. This enables high-precision manufacturing to be achieved through automated material deposition onto the pre-configured last, significantly increasing automation while maintaining manufacturing precision

The patent applies preliminary action by pre-configuring the last with three-dimensional structural surface components before the material deposition process. The last includes pre-formed protrusions, recesses, and structural features that determine the upper's multi-material and multi-layer configuration. During manufacturing, materials are deposited onto this pre-prepared last in a single continuous operation, eliminating the need for separate steps to create each layer or feature. This enables versatile upper designs with multiple materials and layers to be manufactured efficiently, reducing manufacturing cycle time while maintaining design complexity