While the rear fence is in motion moving to the right:
- The left tray lock solenoid [A] is on to lock the tray and prevent the operator from opening the tray.
- When the paper stack starts to move from the left tray, the lock solenoid goes on and moves lever [B] to the lock position to lock the tray.
- After the stack has been moved to the right tray and the rear fence has returned to its home position of the left, the lock solenoid goes off and unlocks the tray.
- This mechanism prevents the tandem tray from being opened while the right tray is being re-supplied with paper.