Advancing material of indeterminate length – Means to engage longitudinally spaced modifications in material – Pins on flexible belt or chain
Patent
1985-04-08
1986-09-16
Christian, Leonard D.
Advancing material of indeterminate length
Means to engage longitudinally spaced modifications in material
Pins on flexible belt or chain
4006162, G03B 130
Patent
active
046117377
ABSTRACT:
A tractor for feeding perforated webs, such as perforated paper in a computer printer, typewriter or the like has a frame which locates a sprocket and a belt having pins projecting from the belt and lugs driven by the sprocket. To provide precision feeding of the web the lid is arranged with respect to the frame so that the web is maintained substantially at the pitch line of the belt where the pins enter, are engaged by and leave the perforations. The distance between the surface of the lid which faces the belt and the belt surface is limited such that the perforations contact the pin surface below a critical position where the web clings to the pins. This is the position where the angle between the surface of the belt and a line from the position of repose perpendicular to a tangent to pin surface which intersects the belt surface is equal to the art tangent of the coefficient of friction between the web and pin materials. The lid surface is preferably provided by a rib extending the length of the lid to overlie and extend beyond the region of entry and engagement of the pins and web perforations. This rib provides a thrust surface against which the pins bear to accommodate the side thrust toward the center of the web when the web is driven by two tractors engaging rows of perforations along the opposite edges of the web.
REFERENCES:
patent: 3825162 (1974-07-01), Hubbard
patent: 4129239 (1978-12-01), Hubbard
patent: 4130230 (1978-12-01), Seitz
patent: 4226353 (1980-10-01), Blaskovic et al.
patent: 4469263 (1984-09-01), Seitz
patent: 4471896 (1984-09-01), Milano, Jr.
Hubbard John D.
Kerivan Leo J.
Christian Leonard D.
Lukacher Martin
Precision Handling Devices Inc.
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