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eccentric. Sixteen inch and longer machines use the center
support as a mounting for the margin rack center support.
As
the paper rotates further, it is guided upward by
th~
front
extensions on the deflector and the front paper scale (Fig. 33).
Margin Rack Cen/er. Support
Feed Roll Release
Shaft
Figure 35. Feed Roll Center Support
The front paper scale is mounted on the platen guide shaft .and
is spring loaded toward the platen by a coi I spring mounted
around this shaft. The scale contains calibrations which cor-
respond to the pitch of the machine.
Dust Cover Adiusting Screw
Figure 36. Line Gage Card Holders
Above the front scale and immediately below the writing line
• are the line gage card holders (Fig. 36). These assist in hold-
ing the paper, and more "specifically, cards to the platen in
the writing area. The line gage card holders are mounted to
the front rail dust cover, which in turn is mounted to the front
'rail. The card holders also have a scale calibrated to the
. 'pitch of the machine. Later machines uSe an offset line gage
6ard holder for the purpose of reducing the possibility of under-
pri nt i ng on the paper.
The two screws that mount the card holders also mount the
16
'indicator pointer (Fig. 36) • This pointer is used .to indicate
the position of the carriage in relation to the type guide. The
operator reads the front scale ,calibration indicated by the
pointer to check the carriage position.
'
Above the writing line the paper is engElged by two or more
rubber rollers which are m<:>lmted on the paper boil (Fig. 37).
,These rollers hold the paper to the platen above the writing
nn~so
as to reduce the possibility of over printing on the
paper. The rollers also·feedthe pop-er away from the operator
so the writing line is plain Iy visible.
Bail
Shaft
Figure 37. Paper Bail
The
'paper
boil
has three positions which are; above tbe plate
in the raised position, in front of the platen in the forward
position, and against the pla'ten in the operating position.
These positions are made possible by the use of paper bai I cam
levers to which the coi led bai I springs supply pressure • The
bail arms are mounted to the paper bail pivot shaft, and are
free to 'rotate about this mounting. The pivot shaft is als9
free to rotate. A stee I ro Iler is mounted on the bottom of each
bai I arm and receives pressure from the cam lever. This pres-
sure forces the rear end of the bai I arm up and the frc;mt end,
'including the bail rolls, down. The bail rolls are free to
rotate about the baiJ shaft, but contain a spring clip that re-
stricts their laterial motion, unless they are pushed with enough
force to over come the resistance of these spring clips. When
the bai I is moved from the forward to the operating position,
a plastic roller mounted on each bai I arm rides over chrome
plated strips of metal, called bumpers, which are mounted on
each carriage end cover. These insure easy operation and
help the bail rolls pull the paper against the platen in the area
of the writing line.
.
Next the paper passes in front ofthe front paper table (Fig.
33). Its purpose is to prevent refeeding of the copy paper and
can be used as an erasing platform.
The front paper table contains two scales; the top is cal ibrated
in inches, the bottom corresponds to the pitch of the machine. (
Thrs table provides an easy method of checking machine pitch.
Simply count the number of calibrations on the bottom scale in
one inch on the top scale. The sum equals the pitch of the
machine.
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