Shift Tray Operation

Tray Shift Mechanism

In the shift mode each copy is staggered as it exits onto the shift tray.

During shift operation a crank gear rotates as far as the next HP position and then moves back to the left and right in order to shift the position of the tray. The amount of shift is 15 mm.

Raising and Lowering the Shift Tray

The shift tray is raised and lowered, depending on how many copies exit from the finisher onto the tray detected by a paper height sensor feeler that touches to the top of the stack.

Raising the Shift Tray

When a stack of copies are removed from the shift tray, the paper height sensor goes ON, the shift tray rises, and then stops when the sensor goes OFF.

Lowering (Shift Mode)

When the paper height sensor goes OFF after it detects the top of the paper stack on the shift tray, the tray lift motor goes ON, and then lowers the stack until the sensor goes OFF again.

Lowering (Staple Mode)

When the staple motor goes ON, the tray lift motor also switches on for a brief prescribed time to lower the tray. After the stapled stack is output onto the tray, the tray is lifted as far as its home position or until the paper height sensor (staple) switches from ON to OFF. This operation is done for stack output. However, there are three lower limit sensors but only one is used, depending on the size of the paper used for the job and displayed on the operation panel.

Target: Large size: B4 and larger 1000 sheets; Small size (up to B4) 2500 sheets

Drag Roller Operation

A drag roller mechanism is mounted above the tray to improve the precision of paper alignment. Each sheet is aligned as the drag roller drive motor rotates the drag roller which pulls each sheet back to the flat side of the finished.

Improving Paper Exit

This finisher employs an air assist mechanism in order to improve the efficiency paper exit with coated paper, thick paper, and thin paper.

• A trailing edge press lever depresses the trailing edge of a sheet as it exits to keep it from slipping, and then a steam of air blowing below the sheet as it exits cushions the paper to prevent it from sticking.
• Fans switch on a blow air when the upstream exit sensors switch ON, and then are switched OFF again by a signal from the main machine.

Configuration

Air Venting Direction

Blow Adjust Mechanism

The movement of the shutter inside the air vent is synchronized with the timing of the operation of the trailing edge lever to reduce the amount of air from the fans to prevent the trailing edge of the sheet from blowing too high as it exits.

Operation Sequence

• Step 1: 1st Sheet Exit Start
  
  Air layer between the 1st exit sheet highest exit position
  

  Shutter/press lever position	Shutter	Press Lever
  	Open	Down

• Step 2: 1st sheet trailing edge emerges, press lever starts to retract
  
  Press lever and shutter joint movement
  

  Shutter/press lever position	Shutter	Press Lever
  	Open > Close	Down > Up

• Step 3: 1st Sheet Exit End
  
  Air stream diminishes, prevents trailing edge of sheet from rising on completion of exit
  

  Shutter/press lever position	Shutter	Press Lever
  	Closed	Retract

• Step 4: Press lever operation start
  
  Press lever and shutter joint movement at cover operation
  

  Shutter/press lever position	Shutter	Press Lever
  	Open > Close	Down > Up

• Step 5: 2nd Sheet Exit Start
  
  Press lever presses down trailing edge to prevent slippage
  

  Shutter/press lever position	Shutter	Press Lever
  	Open	Down

• Step 6: 2nd sheet trailing edge emerges, press lever starts to retract
  
  

  Shutter/press lever position	Shutter	Press Lever
  	Open > Close	Down > Up

• Step 7: 2nd Sheet Exit End
  
  

  Shutter/press lever position	Shutter	Press Lever
  	Closed	Retract

• The sequence repeats for subsequent sheets 4, 5, 6, 7 and so on.