Welding Gun Actuator Layout for Fast Electrode Motion and Collision Protection

The patent applies dynamics by making the second electrode movable through an EMA actuator rather than fixed. This allows the second electrode to dynamically adjust its position and move at controlled speeds during welding operations, enabling high-speed approach while maintaining precise control to prevent collision damage. The movable configuration allows the electrode to adapt its motion characteristics based on operational requirements.

The patent changes the motion parameters of the second electrode by introducing an EMA actuator with controllable speed and position. The actuator enables the electrode to approach at high speeds during non-critical phases and slow down automatically when nearing the workpiece, optimizing both productivity and safety. Force sensors provide feedback to adjust these parameters in real-time, preventing excessive force that could cause damage.

The patent segments the electrode system into multiple components: a shortened EMA rod for safety, a transition piece as an intermediate element, and the electrode itself. This segmentation allows the EMA rod to be short and protected while still achieving the required total stroke length through the combined elements. The transition piece acts as a mechanical extension that preserves the full electrode travel distance without exposing the EMA rod to collision risks.

The transition piece serves as an intermediary element between the shortened EMA rod and the electrode. It transmits the motion from the compact actuator to the electrode, enabling the electrode to achieve full stroke length while the EMA rod remains short and protected. This intermediary structure decouples the stroke length requirement from the EMA rod length, allowing optimization of both reliability and welding capability.

The EMA actuator on the second electrode serves multiple functions: it provides high-speed movement capability, enables precise position control, facilitates force application during welding, and allows rapid repositioning between weld spots. This multi-functionality justifies the added complexity by consolidating several requirements into a single actuated mechanism rather than requiring separate systems for each function.

The patent incorporates force sensors that provide feedback to the control system, enabling closed-loop control of the EMA actuator. This feedback mechanism allows the system to automatically adjust the electrode's position and force application, simplifying the control logic despite the added mechanical complexity. The feedback ensures precise operation and prevents errors that would otherwise require complex mechanical safeguards.

Force sensors are integrated into the EMA actuator system to provide real-time feedback on the electrode's force application. This feedback enables the control system to maintain precise force control during welding, ensuring consistent weld quality. The sensors allow dynamic adjustment of force based on actual contact conditions, compensating for variations in workpiece position and electrode wear, thereby improving manufacturing precision.

The patent replaces purely mechanical force control mechanisms with sensor-based electronic control. Instead of relying on mechanical springs or levers to control electrode force, the system uses force sensors coupled with electronic control of the EMA actuator. This substitution provides more precise and programmable force control, improving welding quality while allowing for flexible adjustment without mechanical reconfiguration.