IBM Selectric - Page 6

Insu Hi c ient bite increases i he possi bi I i ty of a repeat eye I e
because positive latching is not insured. Exc.essive bite
will affect the touch of the keyboard because the latch
pawl must be moved farther in order to trip the clutch.
10. Front Keylever Guide Comb - Position the guide comb
vertically to allow the keylevers to travel 1/32" after
the keylever pawl resets (Fig. 10).
NOTE: An individual keylevermay be adjusted by open-
ing or closing the horseshoe slot on the keylever.
CAUTION: Movement of the front keylever gui de comb
will affect the adjustment of the operation keylevers.
The character interposer should not bottom in the rear
interposer guide combslots when the keylever bottoms in
the front keylever guide comb. This could result in a
keyboard touch problem and possibly keylever pawl
breakage.
11 . Selector Compensator - Adjust as follows:
a. New Style {Fig. 11)
1. Loosen locking set screws in the LH and RH nyl)n
blocks.
2. Latch the extreme RH interposer down.
3. Tighten the RH adjusting plug so that the end
ball will trap the interposer in the latched posi-
tion when the interposer latch is manually dis-
engaged.
4. While holding the latch spring away from the
interposer, back out the adjusting plug slowly
until the interposer restores freely - then back
out 1/6 turn more (one flat on the hexagon nut
is 1/6).
Interposer
Hex
r, } i : t r N C 11,
Cmnpensator Adjustment, New Style
5. Repeat the same procedure on the LH side.
6. Tighten the locking screws in the nylon blocks.
b. Old Style (Fig. 12) -With the extreme RH inter-
poser latched down and held against the right side
of its guide slot, adjust the adjusting screw (or
slider) until the extreme RH ball is trapped between
the interposer and the Qdjusting screw (or slider).
Follow the same procedure for the left side.
4
Ba" Trapped Between The Interposer
And Adjusting Screw
Interposer Held Against Right
Side Of Its Guide Slot
Make Adjustment Here
FIGURE 12. Compensator Adjustment, Old Style
12.
Latch Bai I Shaft - Ad just the plate that supports the right
end of the boi I shaft so that the bai I shaft is parallel to
the cycle shaft.
1 hisadjustment isextremely important because the rollers
on the latch bail MUST contact their respective selector
cams at the same point and with the same pressure in order
to insure that both cams operate the bai I together.
The bail shaft is set at the factory and should not require
a readjustment unless the plate becomes loosened or parts
replacement is necessary. This is a difficult ad justment
to make and should not be loosened unless absolutely
necessary.
The adjustment can be made most easily if the keyboard
is removed; however it can be adjusted with the keyboard
installed if necessary by loosening and tightening the
bail !>haft plate mounting screwswith a hammer and screw-
driver. Thescrewsshould be left friction-tight until the
correct position ofthe plate is obtained in order to faci 1-
itate the adjustment.
The bail shaft plate must be adjusted both vertically and
horizontally in orderto make the rollers of the latch bail
ride their respective cams equally. Changing either the
vertical or horizontal position will affect the other;
therefore both adjustments must be considered together
and ad justed a I ternate I y unti I both are correct. I fare-
ad justment is necessary, the following procedure may be
used.
a. The correct vertical posit.ion is obtained by raising
or lowering the bai I shaft mounting plate unti I both
bail rollers have equal pressure against their re-
spective coms. Check by testing the drag on strips
of paper inserter! het'NPt'n the rollers and the cams.
b. The front to rear position of the bai I shaft plate can
be set re lative to the cyc Ie shaft. Set the Hoover-
ometer to span the distance between the cycle
shaft and the left end of the bail shaft as illus-
trated in Fig. 13. Move the Hooverometer to the
right and adjust the bail shaft plate forward or back
to the same clearance as at the left side. With
the boil shaft parallel to the cycle shaft, the bail
rollers should be contacting their respective cams
at the same point.