When the loaded tray is pushed into the machine:
- The tray lift motor [A] switches on and rotates a coupling [B] interlocked with a pin [C] on the bottom of the tray.
- This rotates the lift shaft [D] and operates the wire pulleys [E] that raise the bottom the tray and paper stack.
- The lift motor coupling remains meshed and locked with the pin of the shaft (to keep the stack raised), but disengages from the arm and automatically lowers the bottom plate and stack when the tray is opened.
- A damper [F] slows the speed of the descent to prevent the tray from falling too fast.
- The lower limit sensor [G] detects the bottom position of the tray.