🔍 Key Concepts

• Function of a synchro-self-shifting (SSS) clutch in connecting the input (prime mover) to the output (reduction gear/shaft) automatically by speed synchronization • Purpose of a lock-out control on machinery – is it meant to stop rotation, or prevent engagement of a mechanism that would otherwise engage automatically? • Difference between shaft rotation and clutch engagement – can the shaft still turn even if the clutch is locked out?

💭 Think About

• Look at the illustration and trace the power flow: from the input assembly, through the main sliding assembly, to the output assembly. Where in that path is the Lock-Out Control located, and what does that suggest about what it affects? • In normal operation, an SSS clutch engages automatically when speeds match. If you apply a lock-out feature, what part of that normal automatic process are you trying to prevent, and why would engineers want that? • For each answer choice, ask: does this describe stopping physical rotation, or blocking the automatic clutching action? Which better matches the idea of a control that can be set by the operator?

✅ Before You Answer

• Verify whether the Lock-Out Control is shown acting directly on the shaft or on the relay/main sliding assembly of the clutch. • Consider if the prime mover or reduction gear might still need to rotate freely during certain operations (e.g., turning gear, maintenance, standby). Which choices would still allow that? • Be sure your choice reflects the idea of preventing automatic engagement versus physically locking the shaft or gear from turning.