Sequence stacker

Details Sequence stacker Sequence stacker

1993-07-22

1994-11-15

Skaggs, H. Grant

Sheet feeding or delivering

Delivering

To receiver for pack of sheets

271198, B65H 2966

Patent

active

053640900

ABSTRACT:
A sequence stacker edge stacks envelopes or the like. Belts carry shingled envelopes in a downstream direction to an angled stop. The belts are carefully spaced vertically above a deck. As a stack of envelopes forms against the stop, the weight of the stack deflects the belts until the top surfaces of the belts become aligned with a stationary surface. At that point, the weight of the stack is transferred from the belts to the stationary surface. Consequently, the downstream driving force of the belts on the envelopes' bottom edges is greatly reduced. The result is that the sequence stacker can stack many more envelopes without backward tipping of the envelopes than prior stacking machines. In an alternate design, certain portions of a stack remain urged downstream at all times by the belts. For that purpose, short spacers are placed at intervals under the belts. The short spacers prevent full deflection of the belts' top surfaces into alignment with the stationary surface, so that the weight of the portions of the stack over the short spacers is not transferred to the stationary surface. The belts therefore continuously exert a downstream driving force on the portions of the stack located over the short spacers.

REFERENCES:
patent: 3700232 (1972-10-01), Wiegert et al.
patent: 3842719 (1974-10-01), Fernadez-Rama et al.
patent: 3945635 (1976-03-01), Marin
patent: 3974626 (1976-08-01), Getsch
patent: 4240539 (1980-12-01), Klapp
patent: 4928942 (1990-05-01), Aiuola et al.

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