Olivetti DR N17, Service Manual, Page: 506 / 558

11-30 687200Q
11.6 Function of Major Components
The function of the major components constituting the Envelope Feeder is described below with reference
to the drawings.
11.6.1 Envelope Feeder
11.6.1.1 Function
• Feed Roll Assembly-1 & Feed Roll Assembly-2:)
— Drive envelopes stacked in the Envelope Feeder to the nip of the Retard Roll.
• Retard Roll Assembly & Bottom Shaft Assembly:
— Permits only one envelope at a time to be transported to the Transfer Roll.
• Transfer Roll Assembly & Pinch Roll:
— Feeds one envelope to the Registration Roll Assembly in the printer at the same drive speed as in the printer.
• One Way Clutch Assembly:
— Functions as a protective part that prevents the Registration Clutch Assembly (Spring Clutch) in the P/H Unit of the
Printer from breaking if the rotation of the Feed Roll Assembly-1 is prevented during the feeding operation of an
envelope.
• One Way Clutch Assembly:
— Functions as a protective part that prevents the Registration Clutch Assembly (Spring Clutch) in the P/H Unit of the
Printer from breaking when the rotation of the Feed Roll Assembly-2 is prevented during the feeding operation of an
envelope. It also prevents a multiple feed of Monarch-size envelopes. Since the value of the torque of the One Way
Clutch Assembly (26T)-B is different from that of the One Way Clutch Assembly (26T)-A, these Clutch Assemblies
cannot be interchanged
• Envelope Feeder Solenoid:
— Receives a Low signal (Signal Name: ENV FEED SOL) from the Print Engine Controller to provide, along with the
Mechanical Drive supplied by the printer drives, rotational movement of Feed Roll Assemblies-1 and 2 for 1.7
seconds.
• Transfer Clutch Assembly:
— Functions as a protective part that prevents the Registration Clutch Assembly (Spring Clutch) in the P/H Unit of the
Printer from breaking when a jam stop occurs with an envelope under the Transfer Clutch Assembly nip.
• Torque Clutch Assembly:
— Provides the Retard Torque that permits only one envelope to be sent to the Retard & Transfer roll Assemblies.
• One Way Clutch Assembly:
— Allows the Retard Roll Assembly to rotate freely after 1.7 seconds of feeding operation. This clutch drives only the
Retard Roll Assembly and does not drive the gears following it while the trail end portion of the envelope being
transferred is under the Retard Roll Assembly.