Integrated envelope sealer and flip module
An envelope sealing and flipping system can be incorporated into a mail inserter system to seal an envelope with a complete unbroken glue line and simultaneously flip the envelope face-up for downstream processing. The system includes a flip cage that receives an envelope and a moveable wetting brush that contacts the flap. The flip cage rotates, causing the flap to drag underneath the wetting brush, and realigning the envelope with a sealer nip which seals the envelope. The flip cage rotates continuously to receive, flip, and seal many envelopes.
1. A method for sealing and flipping an envelope, the method comprising:
receiving a body of an envelope face-down between a pair of nip rollers mounted to a frame;
wetting a flap of the envelope to activate an adhesive substance thereon, wherein wetting the flap comprises:
lowering a moveable brush into contact with the flap portion prior to rotating the frame, wherein the moveable brush is actuated by a servomotor; and
setting a brush contact height by recording a position at which the moveable brush contacts a moistening pad with the servomotor in an open loop mode;
rotating the frame with the body of the envelope secured between the nip rollers to flip the envelope face-up and to cause the flap to bear against a paper guide to form a bend between the flap and the body; and
drawing the bend into a sealer nip with the envelope face-up to press the adhesive substance against the body, to form a seal between the flap and the body of the envelope.
2. The method of claim 1 , wherein the receiving step comprises rotating the nip rollers in a forward roll direction.
3. The method of claim 1 , wherein the moveable brush is loaded with water prior to contacting the flap.
4. The method of claim 3 , further comprising regulating the water volume applied to the flap using the servomotor.
5. The method of claim 3 , wherein rotating the frame causes the flap to slide underneath the brush, thereby wetting the flap.
6. The method of claim 1 , wherein wetting the flap comprises wetting an entire length of the flap, and wherein the seal comprises an unbroken glue line along the entire length of the flap.
7. The method of claim 1 , further comprising, immediately prior to the drawing step, advancing the body of the envelope out from the nip rollers and towards the sealer nip by rotating the nip rollers in a reverse roll direction.
8. A method for sealing and flipping an envelope, the method comprising:
receiving a body of an envelope face-down between a pair of nip rollers mounted to a frame;
wetting a flap of the envelope to activate an adhesive substance thereon;
rotating the frame with the body of the envelope secured between the nip rollers to flip the envelope face-up and to cause the flap to bear against a paper guide to form a bend between the flap and the body; and
drawing the bend into a sealer nip with the envelope face-up to press the adhesive substance against the body, to form a seal between the flap and the body of the envelope,
wherein the frame further comprises a second pair of nip rollers substantially similar to the first pair of nip rollers and mounted opposite the first pair of nip rollers, such that the pairs of nip rollers are 180 degrees apart from each other about the frame's axis of rotation.
9. The method of claim 8 , further comprising receiving a second envelope with the second pair of nip rollers when the first envelope is drawn into the sealer nip, and performing the wetting, rotating, and drawing steps on the second envelope.
10. The method of claim 9 , wherein the steps are repeated on successive envelopes in a continuous loop.