Abstract: A selectively removable block and pusher assembly is provided for a feed chain comprising a plurality of links. At least some of the links are provided with a pair of parallel spaced pins extending transversely therefrom from which the block and pusher assembly is removable. Each block and pusher assembly comprises a block and a pusher removably attached to the block. The block includes a first pair of parallel, spaced bores extending therethrough parallel to its transverse axis for receiving the pins extending from the links, and a retaining member positioned in the block for releasably retaining circumferential grooves formed adjacent the free ends of the pins. The retaining member comprises a flexible and resilient U-shaped spring clip having a pair of spaced legs received in a second pair of spaced bores in the block and an intermediate portion which releasably retains the circumferential grooves in the pins.

Abstract: A bonded unitized envelope stack, manufacturing apparatus, and manufacturing method are provided in which envelopes in a stack are inter-connected by application of two spots of adhesive on the front panel of each envelope to engage the lower panel of the next above envelope. In one embodiment of the present invention, a conventional folding machine including a seal folder flap trap is modified to enable the application of the two spots of adhesive on the front panel of each envelope, and to produce bonded envelope stacks having a given fixed quantity of envelopes. When an envelope enters the seal folder flap trap, a photocell detects and triggers one counter of a dual counter system. A first counter increments each time an envelope enters the trap, until a count termed "preset 1" is reached. When "preset 1" is reached by the first counter, the glue applicator is deactivated. A second counter is then incremented.

Abstract: An envelope forming machine includes frame means supporting envelope blank feed means for feeding envelope blanks from an upstream end serially past aligner means, a printer transfer roller positioned adjacently above selectively operable printer means, scoring means and folding means to an envelope delivery station, with a release paper patch applying means being positioned above the transfer roller to apply a patch of release paper to adhesive on a flap of each envelope as each envelope flap passes over the printer transfer roller which serves as a backup roller against the flap during the application of the patch of release paper to the envelope flap.