Advancing material of indeterminate length – Means to engage longitudinally spaced modifications in material – Pins on flexible belt or chain
Patent
1977-10-31
1979-07-03
Schacher, Richard A.
Advancing material of indeterminate length
Means to engage longitudinally spaced modifications in material
Pins on flexible belt or chain
B65H 1734
Patent
active
041597940
ABSTRACT:
A drive tractor of the type usually mounted in pairs at opposite edges of a web of edge-perforated sheet material such as printout paper has an endless drive belt mounted on a chassis. The chassis is movably mounted on a base member locked to a support bar. A positioning screw permits fine lateral shifting of th chassis relative to the base member to adjust transverse tension in the web. The drive belt preferably has pins projecting from it to engage edge perforations in the web and is trained over sprocket wheels having teeth which engage a tread on the inner surface of the belt. The sprocket wheel is engaged by a drive shaft. The sprocket teeth and belt tread are respectively configured to mesh only in a selected position of the pins relative to the rotational position of the sprocket wheel. This automatically transversely aligns the pins of paired tractors mounted on a common drive shaft.
REFERENCES:
patent: 3477626 (1969-11-01), Hilpert
patent: 3926352 (1975-12-01), Kercher
patent: 3938721 (1976-02-01), Staneck
Data Motion Incorporated
Schacher Richard A,.
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