Advancing material of indeterminate length – Means to engage longitudinally spaced modifications in material – Pins on flexible belt or chain
Patent
1985-08-07
1987-12-22
Levy, Stuart S.
Advancing material of indeterminate length
Means to engage longitudinally spaced modifications in material
Pins on flexible belt or chain
G03B 122
Patent
active
047141859
ABSTRACT:
Apparatus for feeding perforated webs which has a form factor and cost which may be much less than conventional perforated paper feed mechanisms such as pinwheels and tractors, and in a preferred form is an elliptical path pin feed using an endless belt having pins which engage the perforations in the paper and a frame guides the belt over an elliptical path having major curved surfaces and minor curved surfaces along opposite sides and at the ends of the path, respectively. A sprocket journaled in the frame drives the belt. Guide members upstream and downstream of the web feed path and spaced from the opposite ends of one of the major surfaces guide the web so that it remains in contact with the belt along the major surface and enters and leaves the major surface along tangents thereto which are common to the major and minor end surfaces of the elliptical belt path. The elliptical pin feed provides a greater mechanical coupling than provided by the pins alone, because the guide members maintain the paper web along a path congruent and in contact with the entire arc of the major curved surface. The arc of wrap of the paper around the curved path of the belt, also called the wrap angle, may be selected in accordance with the coefficient of friction between the paper and belt surface to obtain the amount of mechanical drive coupling desired.
REFERENCES:
patent: 3347433 (1967-10-01), Bernard
patent: 3746228 (1973-07-01), Arnold
patent: 3825162 (1974-07-01), Hubbard
patent: 4129239 (1978-12-01), Hubbard
patent: 4206859 (1980-06-01), Plaza
patent: 4421261 (1983-12-01), Hubbard
patent: 4469263 (1984-09-01), Seitz
Hubbard Leo J.
Kerivan Leo J.
Levy Stuart S.
Lukacher Martin
Precision Handling Devices Inc.
Sohacki Lynn M.
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