| 摘要 |
Improvements in high-speed machines for inserting sheets into envelopes include a first apparatus for pre-opening envelopes after they are pulled from a hopper and before a blade-like envelope flap opener fully opens them. The first apparatus includes a roller and a roller housing having a top part that defines a small space between them through which a flap-including longitudinal edge of an envelope passes. The edge is constrained to form a curvature as it passes through the small space, causing the flap to open at least to some extent. A second improvement in pre-openers includes a cut out formed in an envelope support plate and a rigid deflector positioned in the path of the envelopes as they leave the hopper. The envelope flaps are partly opened as they are deflected below the plane of the support plate. A third improvement includes a plurality of vacuum dishes formed in an envelope-supporting plate. The vacuum dishes are in fluid communication with a source of air under negative pressure and parts of the address side of an envelope are pulled into the vacuum dishes when a vacuum is applied. This increases the separation between the address side of the envelope and the opposing side to facilitate the sheet insertion process.
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