Hasler WJ 65 Manual page 144

Ensure that the envelopes are stacked along the side and front
guides. If necessary, re-adjust the side
guide by resting it against the envelopes
without pressing.
Press the
after a short pause the motor will start.
Printed envelopes will subsequently be deposited into the receiving
tray.
Envelopes exceeding 1/4" in thickness should be hand
fed, for an envelope exceeding 3/8" thick, a label must be
used, refer to Printing labels.
38 Postage clearing with autofeed
button,