Shift Tray Lift and Height Adjustment

Sensor, Switch Summary

The tray lift motor [1] raises and lowers the tray [2].

The shift tray paper sensor [3] is mounted in the jogger unit.

• When there is no paper on the tray, its actuator falls into a cutout in the tray and signals no paper on the tray.
• When there is paper on the tray (at least one sheet), the actuator remains up signaling paper on the tray.

When the top of the stack grows high enough as paper is output onto the tray, the actuator enters the gap of the paper height sensor [4]. This signals the tray lift motor to lower the tray the prescribed distance so the tray can accept more paper. This sequence is repeated until the tray is full.

The tray upper limit switch [5] is mounted behind the paper height sensor. If the edge of the tray (not the stack) raises high enough to push up the actuator along the length of the tray edge, this will trigger the micro-switch, signalling the high limit of the tray switch and this turns off the stacking operation.

There are two tray guard sensors [6] mounted side by side in the jogger unit. Each sensor is mounted above a swinging plate with an actuator on top. If the top of the stack pushes up either plate far enough to activate either sensor, this will shut down operation of the stacker immediately. These sensors are also fail-safe mechanisms. If the stack on the tray skews and either the paper height sensor or tray high limit switch fail to detect the top of the stack, one of the guard sensors will trigger a signal to shut down the stacker. This prevents the top of the stack (or empty tray) from striking the bottom of the paper transport plates above and causing damage.

The four tray full sensors [7] signal the status of the tray on the main machine operation panel at each stage: 25% full, 50% full, 75% full, 100% full. When the actuator on the tray reaches tray full sensor 4 (100%), the stacking operation will stop, signaling the operator that the cart is full and must be emptied.

The tray low limit sensor [8] signals when the tray is down (the cart can be removed).

The tray low limit switch [9] will shut down the stacker if the edge of the tray hits this micro-switch. This is one additional fail-safe mechanism designed to shut down the stacker if either sensor above (Tray Full 4, Tray Low Limit Sensor) fails to signal tray full.

Power Off

At the end of the job:

• The tray does not lower.
• The operator must press the DOWN button on the stacker operation panel to lower the tray and remove the paper stacked on the cart.

Power ON

If there is no paper on the tray:

• The shift paper sensor [3] detects no paper.
• The tray lift motor raises the tray until the paper height sensor [4] is pushed up far enough to detect the top of the tray and then stops.
• The tray lift motor reverses and lowers the tray to the start position.

If there is paper on the tray:

• The shift paper sensor [3] detects paper.
• The tray lift motor raises the tray until the paper height sensor [4] detects the top of the stack and then stops.
• The tray lift motor reverses and lowers the tray far enough to accept more paper.