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This article presents a relatively simple apparatus for feeding and exiting sheets automatically to a typewriter, or the like. The same feed rollers are used on both sheet entry and exit.
English (United States)
This text was extracted from a PDF file.
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This is the abbreviated version, containing approximately
89% of the total text.
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Paper Entry Exit Mechanism
This article presents a relatively simple apparatus for feeding and exiting
sheets automatically to a typewriter, or the like. The same feed rollers are used
on both sheet entry and exit.
Referring to the figure, cone rollers 2 and 5 are driven off
platen 6 through a gear train and belt assembly including gear 10,
idler 12, gear 14 and belt 16. A sheet 20, separated from the stack
in a cartridge (not shown), is fed by the bottoms of rollers 2 and 5.
Sheet 20 is in contact with points 3 and 6 on the bottoms of
rollers 2 and 5 as it is being entered toward the platen. On exit,
sheet 20 continues around platen 6 and is guided by means (not shown)
to the top of rollers 2 and 5 at points indicated at 4 and 7.
Guide member 21 serves a triple function: (1) Portion 22 is an edge
aligner during feeding and exiting. (2) On entry, base portion 23
provides a backup surface for rollers 2 and 5. (3) Portion 24,
parallel with base 23, is a backup surface during sheet delivery to a
receiving area (not shown).
The gear ratio is such that rollers 2 and 5 rotate at all times with a peripheral
speed higher than that of platen 6. The advantage of this arrangement is that on
entry a slight buckle, indicated at 30, is created in the sheet which is useful in
avoiding drag which could possibly cause skewing of print or even tearing of the
paper. On exit. however, the higher peripheral speed of rollers 2 and 5 pulls the
sheet and keeps it taut. In this manner, f...