Booklet Stapling

After the sides of a stack are aligned by the side fences on the stacking tray, it is hooked by the feed-out pawl moved up toward the paper exit on the left side of the finisher.

Sensors and rollers comprise the junction gate that sends the stack into the booklet stapling unit.

The stack is fed onto the stapling tray of the corner stapler unit where the sides of the stack are aligned by the side fences and the top and bottom aligned by the top and bottom fences [A]. The stack feed-out belt motor turns on and swings the stack feed-out belt pawl [B] up between the bottom fences and catches the edge of the stack and raises it upward.

The stack JG motor switches on and closes the stack junction gate just before the top of the stack reaches the top of the stapling tray. This guides the stack into the vertical path of the booklet unit.

• As the fold plate [1] thrusts forward, the fold roller keeps rotating to force the plate into the center of the stack.
• When the horizontal fold roller reaches the paper fold position, the fold roller nip [2] opens, and then the fold roller motor moves the fold roller [3] back and forth to sharpen the crease of the fold..
• The horizontal fold roller is raised [4], and the nip [5] closes.
• Finally, the fold rollers [6] feed the stack through the exit..
• In this finisher by making the fold roller rounded and the fold plate comb shaped, up to 6 sheets (64 to 90 g/mm2) can be inserted 1.0 mm into the nip for folding.
• The horizontal fold roller is spring loaded, so that when it is forced to the rear the crease of the fold in the sheets is increased.

Here is a side view of the crease roller mechanism.

• [A]: Back
• [B]: Front
• [C]: Booklet

The spring loaded crease roller mounted on a steel guide shaft applies pressure to the stapled and folded edge as it is driven rear to front and the front to rear.