Staple Tray Jog Mechanism

Stacking Mechanism

• Paper going past the junction gate on its way to the staple tray passes the brush roller. At the pre-stacking of standard size paper, leading edge of the sheets are aligned by the leading edge stopper. However, the positioning roller supports paper drop after 80 sheets of small-size paper (less than 350 mm), or 25 sheets of large-size paper (over 350 mm).
• In other cases where pre-stacking is not done, after the staple exit sensor goes OFF (within 94 to 119 ms, size of the stack not withstanding), the positioning roller drive motor rotates a prescribed distance, the sheets drop onto the tray base fence where the leading edges of the stack are aligned. At this time, the brush roller brush and the exit guide fulfill the function as guides for the falling sheets.
• The rear and forward movement of the stapler in the main scan direction, and the up and down movement of the entire base fence unit in the sub scan direction adjusts the stack position for booklet stapling.
• Also, the base fence can be moved to the rear and front for the size of the paper in the main scan direction. This front to rear movement, coupled with the front to rear movement of the stapler, accommodates different paper sizes in the main scan direction (with the trailing edge firmly clamped), ands greatly improves the efficiency of stapling.

Jogger Mechanism

During the stacking operation, once the trailing edges of the sheets have been aligned, the sides are aligned by the jogging operation.

• First, at the beginning of the job ("Copy Start") the jogger fences are moved to within 7.2 mm of the left and right side of an area equal to the width of the paper size selected for the job.
• After the trailing edge of the feeding sheet passes the staple exit sensor, the jogger fences close 3.7 mm (4.6 mm for B5 LEF, B4 SEF), the paper slides between the fences, and then the trailing edge is aligned.
• Next, on the booklet stapling side the jogger fences close in 7 mm to achieve horizontal alignment. However, the front and rear jogger fences on either end each have a motor that can position the sides of the stack for booklet stapling.
• At the end of the jogging operation, the jogger fences once again open 7.2 mm wider than the paper so the stack can move to the standby position.
• Springs are attached at the front and rear of the jogger fences to compensate for drift from precise alignment positioning.

Movement Adjustment of Jogger Fences During Horizontal Alignment

Paper Press Mechanism

A stack must be compressed at the trailing edge in order to achieve stapling a stack maximum size (100 sheets).

• After jogger moves to the paper edge position, the trailing edge jogger motor switches ON and operates the trailing edge press plate to press down and remove any air between the sheets.
• After the next sheet switches the stapler tray exit sensor OFF, once again the trailing edge press motor switches ON and the press plate returns to its standby position. The trailing edge press plate HP sensor detects the plate at its home position. This operation cycle is done for each sheet that feeds onto the staple tray.
• At this time, as the trailing edge is depressed the stapler is moving front and back, and before and after each compression of the trailing edge, the edge is compressed to remove curl.
• Front and rear compression of the trailing edge is not done at the booklet stapling position.