Sheet-material associating – Associating or disassociating – Signature associating
Patent
1984-11-14
1985-09-24
Eickholt, E. H.
Sheet-material associating
Associating or disassociating
Signature associating
226 2, 226 28, 226 38, 226 45, B65H 4500, B65H 2300, B65H 2502
Patent
active
045428930
ABSTRACT:
An apparatus and method whereby two superposed strips (26, 28) of documents are conveyed in a direction of conveyance (30) toward a downstream workstation. The strips (26, 28) are conveyed over one another in a direction of superposition whereby the leading edges of documents of one strip alternate in sequence in the direction of conveyance with the leading edges of documents in the other strip. A determination and control (190) circuit determines whether the leading edges of documents in one strip are tending to creep up on the leading edges of documents in the other strip due to differing speeds of motion of the two strips. If a creeping condition is determined, the circuit (190) energizes brake (400) whereby the motion of at least one of the strips is at least temporarily retarded. The circuit (190) comprises a detector (188) for determining when leading ones of documents have been separated from their respective strips; timing pulse generator (200); counter selector (206) for selectively enabling a first counter (202) and a second counter (204) to count timing pulses (the counters (202, 204) being enabled in alternating fashion after documents are separated in alternating strip fashion from their strips); and, comparator (207) for comparing the counts in the two counters. The detector (188) detects leading edges and trailing edges of separated documents conveyed past it. The counters are enabled to count when the trailing edge of a preceding separated document is detected and are disabled when the leading edge of a just-separated document is detected. The control circuit (190) periodically deenergizes the brake for a time period extending from the time at which the leading edge of a just-separated document is detected until the time at which the trailing edge of the just-separated document is detected.
REFERENCES:
patent: 3556509 (1971-01-01), Crum
patent: 3589095 (1971-06-01), James et al.
patent: 3713571 (1973-01-01), Simonton
patent: 3972283 (1976-08-01), Jennings
patent: 4118022 (1978-10-01), Rayfield et al.
patent: 4223882 (1980-09-01), Stocker
patent: 4485949 (1984-12-01), Gebhart
patent: 4502676 (1985-03-01), Stocker
Clause, Jr. Marvin B.
Thompson Callie R.
Bell & Howell Company
Eickholt E. H.
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