Envelope transport module with vacuum ports for use in an envelope inserting machine

An envelope transport module to be used in an envelope insertion station of a mail inserting machine, wherein an envelope has a leading edge and a trailing edge defining a dimension of the envelope, the trailing edge having a flap which is opened for enclosure material insertion when the envelope is securely held at an insertion location in the envelope insertion station, said transport module comprising:

• a frame having an upstream end and a downstream end;
• a transport mechanism disposed on the frame for moving the envelope into the envelope insertion station from the upstream end to the insertion location, the transport mechanism having a support surface to support the envelope;
• a registration mechanism to register the leading edge of the envelope as the envelope reaches the insertion location, wherein the registration mechanism is adjustably mounted on the frame so as to allow the registration mechanism to be positioned at a location between the upstream end and the downstream end in order to accommodate the dimension of the envelope;
• and
• a vacuum suction device positioned relative to the frame between the upstream end and the downstream end so as to urge the envelope to press against the support surface, wherein the vacuum suction device comprises a first vacuum module and a separate second vacuum module, and wherein
• the first vacuum module is disposed between the upstream end and the registration mechanism near the upstream end to provide a suction force on the envelope near the trailing edge thereof, and
• the second vacuum module is adjustably disposed between the first vacuum module and the registration mechanism so that the second vacuum module can be repositioned to provide a further suction force on the envelope near the leading edge thereof.