Ricoh D131 Service Manual page 1495

Details
The dynamic roller [A] lowers when the leading edge reaches stopper 1 [B] within the time
prescribed for feeding for the size of the paper selected for the job.
The TE stop pawl [C] presses on the 1st sheet to prevent the leading edge of the 2nd sheet
from hitting it. The operation sequence for stacking the 2nd and 3rd sheets is the same as
that of the 1st sheet.
D454/D615 102 SM