Inclined Rail Slit Geometry for High-Speed Film Stretching

The patent applies asymmetry by forming the slit in the rail at an inclined angle (θ) of 45° or more and less than 90° relative to the extension direction of the rail. This asymmetric orientation prevents the guide roller from directly impacting the slit edge during movement, thereby reducing vibrations while maintaining guidance stability. The inclined configuration transforms the vertical impact into a distributed contact along the inclined surface, resolving the contradiction between stable guidance and high-speed movement.

The patent changes the geometric parameter of the slit orientation from the conventional perpendicular (90°) configuration to an inclined angle (θ) of 45° or more and less than 90° relative to the rail extension direction. This parameter modification reduces vibrations during high-speed movement while maintaining manufacturing feasibility through standard machining processes, thereby resolving the contradiction between ease of manufacture and stretching efficiency.

The patent maintains the simple single-slit rail structure but applies asymmetry by orienting the slit at an inclined angle (θ) of 45° or more and less than 90° relative to the rail extension direction. This asymmetric configuration prevents direct impact between the guide roller and slit edge, eliminating vibrations that would obstruct high-speed operation, thus resolving the contradiction between device simplicity and high-speed capability.