Articles spiked, threaded, cemented, or gummed together, to prevent double feed, e.g. piles with gummed edges

Full Title

Separating articles from piles (associating, collating, or gathering articles B65H39/00; machines for separating superposed webs B65H41/00; unpiling thin material combined with folding B65H45/26; combinations of piling and depiling operations, of interest apart from the single operation of piling or depiling B65H83/00) > Supplementary devices or measures to assist separation or prevent double feed (control means comprising detectors responsive to double feed B65H7/12) > Articles spiked, threaded, cemented, or gummed together, to prevent double feed, e.g. piles with gummed edges