Teletype 28 - Page 43

ISS 8, SECTION 57:3-118-IOOTC'
2.33 Punch Mecl12.nism for Fully Perforated Tape (Indentation of Feed Wheel Bet,~PP'! l;~edHc:•"s~
Note 1: Adjustments on this page do not apply to tape printer.
---
Note 2: Before proceeding with the following adjustments, check both tape guide spring-
tensions (2.35).
TEN CHARACTERS PER INCH (Final) (Latest Design) (For Early Design See 2. 31} *(See Note 4)
(1) Requireme!lt
With tapt. shoe blocked away from feed wheel, feed pawl and detent disengaged, anrl tap.>
removed from punch mechanism, feed wheel should rotate freely (check through 3 c·r 4
rotations).
(2) Requirement
Perforate six series of 9 BLANK combinations followed by a LETTERS combination. Place
tape over smooth side of TP156011 gauge so circular portion of first number two ccd<:' !iole
in tape is concentric with first 0.072 hole of gauge (see note). The next four 0.072 hoJI?s il!
tape gauge should be visible through the number 2 code holes in tape and circular pnrtk.tl of
the last (sixth) number 2 code hole in tape should be entirely within the 0. 086 diameter h;:Jle
of tape gauge.
Note 3: The first five holes in gauge are the same size as code holes in tape (0. 072 hu~h
diarfleter) but the sixth hole in gauge is larger than the first five (0. 086 inch diameter). Tlri.s
arr-angement allows .::<>.007 inch variation in five (5) inches.
To Adjust
(1) With tape removed from punch mechanism, loosen die wheel eccentric stud locknut and adjust
die wheel so that it just binds on feed wheel, back off eccentric so die wheel is just free (.\!h~ck
freeness through 3 or 4 rotations). Keep indent off eccentric stud below the horizontaJ center
line of stud.
(2) Check ten characters per inC'h requlrement and refine feed wheel die wheel clearance adjust-
ment to meet the requirement by moving indent of die wheel eccentric stud toward ief't~ wh~el
to decrease character spacing and away from feed wheel to increase the chara.cter spacing.
CAUTION: WITH TAPE F.EMOVED FROM PUNCH MECHANISM, BE SURE DIE WHEEL DOES
NOT BIND.
(3) With tape shoe away from feed wheel, feed pawl and detent disengaged, and tape removed f:rom
pwtch mechanism, feed wheel should rotate freely. Failure to meet this requirement indicates
die wheel eccentric has been overadjusted. To meet this requirement, refine the adjustment.
*Note 4: The adjustments on this page are for
five-level fully perforated tapes, with indentation
of feed wheel between feed holes.
(1) 11/16 inch wide tape with printing between
feed hoies.
(2) 7/8 inch wide tape having a margin for
printing at top of tape.
(3) 7/8 inch wide tape having a margin for
printing at bottom of tape. (See figure
on following page)
CODE HOLE IN TAPE
CONCENTRIC WITH
0.072" DIAMETER
HOLE
IN GAUGE
HOLES OF GAUGE
VISIBLE THROUGH
CODE HOLE
IN TAPE
TP156011 GA\TGE
FEED HOLE _ •.
DIE WHEEL
ECCENTRIC
STUD
PLACE TAPE ON
SMOOTH SIDE OF
TAPE GAUGE
~d DIE
WHEEL
(F::-nnt View)
"HOI...E lN J' APE
SHOULD BE
0 /' 0,; ,.. - "' '\0 8
--- EN'T'IREJ,Y WITHIN
'l'HE ~: .. 086"
<>C<'' r 00·)• < 00•,,, ~ ooo~o ~OOO~O<><>•n"·<><><>·<>~<><><>o<O<>oo~o oooooo.o~ o ~o <>·j TEN HOLES
0 0 c 0 •
g hb g 8 ~ 8 PER 'NCH
-~~ENTA;-I~i-·=.=.: - .... l=1" ! T ~~~~~fL
DIAMETER HOLE
IN GAUGE
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