The operation of stack folding and saddle shaping is described below.
Saddle shaping alone is described below under "Saddle Shaping Operation".
When the fold plate [B] pushes the center of the stack between the fold transport rollers [E], the side-to-side roller unit [A] slides along the upper path [D]. Next, when the fold plate [B] has pushed the center of the stack completely between the fold rollers, the upper part of the fold roller unit, while pushing out switch plate 1 [F], slides down onto the lower path. Next, the lowering of the top of the side-to-side roller unit [C] presses in the center of the stack with pressure by a large spring, and then center folding begins when the fold plate [B] pushes into the center of the stack.
The movement of the fold plate cam stops fold plate [C] and this holds the center of the stack out in the folded position. The fold roller [B] applies pressure to the protruding stack and moves it toward the left as shown below. Next, when fold roller unit cam sensor [A] goes on twice after the cam has rotated twice, the saddle shape operation is half finished, the fold roller unit is at position [D], and then the press fold motor switches into reverse. At the same time, in the upper path the top of fold roller unit reverses, releasing pressure on the fold.
When the fold roller unit releases pressure and starts to reverse its direction, the top of the side-to-side fold roller presses switch plate 2 which directs it down into the lower path. When pressure is applied to the remaining part of the stack, fold roller [A] returns to the home position, detected by the fold blade HP sensor [B].