Tally 424 User manual

TAPE
READER
Revis ed 4-1-62
MANUAL
MODEL 424
This publication reproduced
with the permission of
TALLY REGISTER CORPORATION
1310 Mercer Street
Seattle 9, Washington
D - 1066

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LIST OF ILLUSTRATIONS
Model 424C Console Reader .
6" and 10" Tape Reels ....
Title
Model 424PF with Fanfold Tape Handling .
Model 424PR with 6" Reels ..... .
Model 424PR with 6" Reels, Plan View
Capstan Drive, Exploded View .. . .
Star Wheel Reading Perforated Tape
Timin g Diagram
Wiring Diagram
Spark Suppressi on Waveforms .
Standard Tape Dimensions.
Lubrication Chart . . . . .
Tape Read Head, Exploded View .
Checking Contact Pressll!'e with a Gram Gage
Correct Positioning ior Star Wheels .
Escapement Adjustments
Bad Tape Splice . . . . .
Bi-directi o nal Tap e Splice .
End-of-Tape Switch Schematic.
End-of-Tape Switch Adjustments.
Capstan Commutat .) r
Commutator Timing Diagram
Model 424P Tape Rea der , Parts List
Model 424C Tape Reader , Parts List
Capstan Drive, Parts List ... . . . "
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SCATTL[
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Figure
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LIST OF ILLUSTRATIONS (Continued)
Tape Read Head, Parts List . . .
Reel Drive Mechanism, Parts List
End-of-Tape Switch, Parts List .
Commutator Unit, Parts List . .
Title
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SEATTLE
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Figure 1. Model 424C Console Reader
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Figure 2. 6" and 10" Tape Reels
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Figure 3. Model 424PF Reader With Fanfold Tape Handling.
Figure 4. Model 424 PR Reader With 6" Tape Reels
SEATTLE
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REEL DRIVE BELT L.H. /
-CABLE CONNECTOR r DRIVE MOTOR
, F USE MOTOR CHASSIS
C APACITOR
\ -CAPSTAN
I l)RIVE BELT
1-REEL DRIVE
BELT R.H.
REEL DR I VE --
MECHANl SM LH .
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LIFT LEVER \- TAPE
TAPE TENSION ARM ~
REEL
READ HEAD ASSEMBLY ~
Figure 5. Model 424PR Reader With 6" Reels, Plan View
R.H.

Section
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TABLE OF CONTENTS
Title
INTRODUCTION . . . . . . . . .
1.1 General Specifications .
1.2 Description . . .
1.3 Input Requirements . .
1.4 Outputs . . . . . . . .
1.5 Tape Handling . . . . .
1.6 Environmental Conditions
MECHANICAL OPERATION ....
2.1 Motor and Capstan Drive
2.2 Tape Read Head ..
ELECTRICAL OPERATION .
3.1 Escapement Operation .
3.2 Switching Action . . . .
3.3 Timing . . . .....
3.4 Cycle Length Limitations
3.5 Terminations . . .
3 .6 Spark Suppression
3. 7 Contact Ratings
INSTRUCTIONS FOR USE .
4.1 Paper Tape Standards and Channel Identification .
4.2 Threading Tape
MAINTENANCE . . . • . .
5.1 Lubrication .....
5.2 Read Head Service .
5.3 Drive System Parts Replacement
TAPE SPLICING . . . . . . . . . . .
SPECIAL ACCESSORY EQUIPMENT
7.1 End-of-Tape Sensing Switch .
7.2 Capstan Shaft Commutator . .
PARTS ORDERING AND PARTS LISTS.
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TALLY
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Figure 11. Standard Tape Dimensions
5.0 MAINTENANCE
5.1 Lubrication (See Figure 12)
After eve ry 500 hours of operation, lubricate the following:
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(a) Escapement Clutch Assemblies. Lubricate both sides of each escapement clutch
assembly between the friction washers and the spur gear with silicone oil, 350 centipoises.
(b) Shaft Bearings. Lubricate shaft and idler gear bearings, using rust and oxidation
i nhib ited oil, SAE 20 grade. If the reader is equipped with tape reeling equipment, the reel drive
mechanism bearings should also be lubricated with the same oil.
(c) Escapement Assembly. Clean, and then lubricate each escapement armature ful-
crum with a light film of Tally pivot grease A. The adjacent armature pole face must be wiped
clean of all lubricant.
(d) Drive Motor. Lubricate drive motor bearings using rust and oxidation inhibited oil,
SAE 20 grade .
5.2 Read Head Service
5.2.1 Trouble-Shooting Reading Errors
If erratic readings are detected, examine the contacts for dirt or pitting. If dirty,
clean as outlined in Section 5.2.2. If pitted, they should be replaced and adjusted per Section
5.2.3. Check the star wheels and star wheel levers for free movement, and clean if neces sary.
Check switch timing and contact pressure per Section 5.2.3.
5.2.2 Cleaning Contacts
Access to the read head contacts may be gained by removing one screw on the
front of the read head cover and withdrawing the cover away from the front panel. If the con-
tacts are dirty or corroded, they should be cleaned with methyl ethyl ketone. Use a fine brush
or pipe cleaner as the applicator, and dry with compressed air. Use caution not to bend the
small movable contact wires with the brush or air blast.
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POINT NO .'
LUBRICANT l
"""? i)
MINERAL OILI S
AE
20 !
2)
TALLY
GREASE "A"
!
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SILICONE O
IL I 3!50 cs :
Fi gure 12. Lu br ic a tio n Chart
SE A Tl l [
P age 11

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