Stack Tray Operation; Tray Operation - Canon Saddle Finisher-T2 Service Manual

Chapter 2

2.5 Stack Tray Operation

2.5.1 Tray Operation

0009-2522
This equipment has three delivery trays. The upper tray is called escape tray, the middle tray is called tray 1, and the
lower tray is called tray 2.
The escape tray is fixed and tray 1 and tray 2 can move up and down independently.
The escape tray has an escape tray full detector sensor (PI119). When the escape tray becomes full, the finisher
controller PCB notifies the host machine to that effect.
The finisher controller PCB controls the vertical movement of tray 1 and tray 2 by changing the drive direction of
the tray 1 shift motor (M107) and tray 2 shift motor (M108) (incorporating a motor driver PCB).
Tray 1 paper sensor (PI111) and tray 2 paper sensor (PI112) are provided to detect the presence of the paper stacked
on tray 1 and tray 2.
The home position of tray 1 is detected by the tray 1 paper surface sensor (PI114) and the home position of tray 2 is
detected by the tray 2 paper surface sensor (PI115) 1. The home position is the top surface of the paper if paper is
already stacked on the tray, or the position where the edge of the tray is detected if no paper is stacked. The tray 2
paper surface sensor (PI120) 2 detects the paper surface when 651 or more sheets are stacked in tray 2. When the
power is turned on, the finisher controller PCB drives the tray 1 shift motor (M107) and tray 2 shift motor (M108)
to return the tray 1 and tray 2 to their home positions. If either tray is already at the home position, it is moved out
of the home position once and then returned to the home position again. If both tray 1 and tray 2 are at their home
positions, this operation is performed for tray 2 and then for tray 1. If the tray specified by the host machine is tray
2, the finisher controller PCB raises the tray so that tray 2 is at the delivery port.
When paper is stacked on either tray, the tray 1 shift motor (M107) or tray 2 shift motor (M108) is driven a prescribed
number of pulses to lower the tray. Then the tray returns to the home position to prepare for the next stack.
The upper and lower limits of the tray are detected by three area sensors (PS981, PS982, and PS983) on the tray 1
and tray 2 shift area sensor PCB. The finisher controller PCB stops driving the tray 1 shift motor (M107) and tray 2
shift motor (M108) upon detection of the upper or lower limit of the tray. Also, the ON/OFF combinations of the
area sensors (PS981, PS982, PS983) are used to detect over-stacking according to the stack height for large size and
mixed stacking.
The finisher controller PCB stops supplying +24V to the tray 1 shift motor (M107) and stops the finisher operation
when tray 1 closing detect switch (MSW103) turns ON.
2-52