Primera AP550e Operator's Manual page 8

9.
Important Note: Do not feed the label stock into upper slot!
Label Path
8 AP550e Label Applicator
Use both index (pointer) fingers to roll the leading edge of the label stock UNDER the Label
Guide Roller. Feed the stock forward until it enters the Sensor Housing.
Label Guide Roller
Label Guide Roller Do NOT feed here!
Sensor Housing
Label Guide Roller
Feed under this plate.
Side View