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Disclosed is a forms feed tractor for moving paper having edge perforations through a computer printer or other similar apparatus. This tractor provides a universal, low-cost, snap-together design.
English (United States)
This text was extracted from a PDF file.
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This is the abbreviated version, containing approximately
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Computer Printer Forms Feed Tractor
Disclosed is a forms feed tractor for moving paper having edge perforations
through a computer printer or other similar apparatus. This tractor provides a
universal, low-cost, snap-together design.
The disclosed tractor assembly embodies a universal design. In a computer
printer forms feed mechanism at least one tractor 11 is required on each side of
the perforated edge of the forms 14 as seen in Fig. 2. In prior art a "left" and a
"right" tractor assembly is required, at least one of each on opposite form edges,
two distinctly different tractor assemblies. Unlike prior art, the disclosed tractor
assembly can be used on either perforated form edge due to its universal design, i.e., one tractor assembly for either form edge. As seen in Fig. 1, the universal
nature of the disclosed tractor design is attributed to the fixed distance between
the central bushing bore 10 of the chassis 1 and each of the two pulleys 7,
coupled with the belt
tension shoe 8 which provides tension to the pin belt 5. In the disclosed tractor
design either pulley 7 (in Fig. 1) can be the driven pulley which engages with the
drive shaft 12 (in Fig. 2), thus this tractor design can be interchangeably used on
either form edge.
The low cost of this forms feed tractor is the result of several design features.
As seen in Fig. 1, many parts from prior-art tractors have been combined into a
minimal number of parts which results in a low total parts cost (only...