Severing by tearing or breaking – Breaking or tearing apparatus – Work-parting pullers
Patent
1979-11-28
1981-08-18
Yost, Frank T.
Severing by tearing or breaking
Breaking or tearing apparatus
Work-parting pullers
225106, B26F 302
Patent
active
042842212
ABSTRACT:
Apparatus for separating successive sections of a running web wherein neighboring sections are connected to each other by weakened (e.g., perforated) web portions has a first and a second web driving unit. The second unit is located behind the first unit, as considered in the direction of transport of the web, and its speed is reduced below the speed of the first unit (and/or the speed of the first unit is increased above that of the second unit) when a weakened portion is located between the two units. This results in automatic separation of the preceding section because the tensional stress upon the weakened portion behind the preceding section suffices to destroy such weakened portion. The weakened portions are monitored by a detector which transmits short-lasting signals to change the speed of the first and/or second unit when a weakened portion advances beyond the second unit but is yet to reach the first unit. When a separating step is completed, the speed of the two units is again the same.
REFERENCES:
patent: 3331543 (1967-07-01), Kezeli
patent: 3338487 (1967-08-01), Schutz
patent: 3445047 (1969-05-01), Sloan
patent: 3481520 (1969-12-01), Pickering
patent: 3672551 (1972-06-01), Peterson
patent: 3789571 (1974-02-01), Tall et al.
patent: 3792807 (1974-02-01), Mare et al.
patent: 4091978 (1978-05-01), Graham
Nagel Erich
Schaner Ferdinand
Ziegler Franz
Agfa-Gevaert Aktiengesellschaft
Kontler Peter K.
Yost Frank T.
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