Guide Rail Docking Blocker to Prevent Delivery Tool Derailment

The blocking member is activated before the docking guide rail reaches the delivery guide rail to prevent the delivery tool from moving forward. This preliminary blocking action ensures that even if the control system or drive motor has positioning errors, the delivery tool cannot derail because it is physically blocked from moving into the docking guide rail until proper docking is achieved.

The blocking member acts as an intermediary safety mechanism between the delivery tool and the docking guide rail. It mediates the potential harmful effect of positioning errors by physically preventing the delivery tool from entering the docking guide rail until the docking guide rail is properly positioned, thus resolving the contradiction between automation and reliability.

The blocking member is designed to be automatically activated and deactivated by the docking guide rail itself during the docking process. When the docking guide rail approaches, it mechanically triggers the blocking member to activate; when docking is complete, the docking guide rail automatically deactivates the blocking member. This self-service mechanism eliminates the need for external control systems or additional actuators, thereby maintaining simple device structure while improving safety.

The blocking member uses a simple mechanical trigger mechanism activated by the docking guide rail's movement, replacing complex electronic control systems or additional motors that would be needed to control the blocking member's activation and deactivation. This mechanical substitution maintains device simplicity while achieving the desired safety function.