Teletype 28 - User Manual

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TELETYPE CORPORATION
Skokie, Illinois, U.S. A.
SECTION 573-118-700TC
Issue 8, November 1972
28 TYPING REPERFORATOR AND TAPE PRINTER
ADJUSTMENTS
CONTENTS
PAGE
1. GENERAL . • • . • • • • • • • • • • • • • • 6
2. BASIC UNITS . • • • . • • • • . • • • • • • 11
Chad Chute Assemblies for Fully
Perforated Tape
Chad chute (self-contained typing
reperforator set) . . • • • • • . . • . • . . 78
Chad chute assembly (auxiliary
reperforator - ASR Set). . • . . . . • • 79
Chad chute assembly (keyboard
reperforator - ASR Set). . • . • • • . . 79
Chad chute assembly (multiple
reperforator set) . . . . • . . . . • • . • • 78
Function Mechanism
Cam follower lever spring (early
design) ......••..•.••••••••.
Cam follower lever spring (latest
design) ....•••......•.•.••.•
Cam follower roller .•...•.••.••
Cam follower roller alignment •••..
Clutch shoe lever ....••.•.••.•.
Clutch shoe lever spring ..•••••••
Clutch shoe spring .••••.•••••••
Function clutch drum endplay .••.••
Function clutch latchlever spring .••
Function clutch release lever
spring ..•. · .••••••••••••••••
Function clutch trip lever .•••••••
Release lever downs top bracket • • . •
Reset arm •.••••.•..••••••••
Reset bail trip lever (final) ••••.••
Reset bail trip lever spring
(early design) ..•.•••••••.•.••
Reset bail trip lever spring
(latest design) ••••.•.••..•••••
Trip cam follower lever
(preliminary) . • • . . • . • • • • • • . • •
Punch Mechanism
Detent lever spring .•..•.•••.••
Feed pawl ...•.•.•..••••••.••
Feed pawl spring ...••••••••.••
26
27
28
28
11
12
12
11
25
49
24
49
25
34
26
26
26
46
35
46
CONTENTS
PAGE
Latchlever clearance . . . . . . . . . . . 35
Perforator drive link spring . . . . . . 31
Punch mounting plate (final). . . . . . • 30
Punch mounting plate
(preliminary) . . • . . . . . . . . . . . . . 29
Reset bail trip lever (final) . • . • . . . 34
Tape depressor slide spring . • . . . . 47
Tape guide (early design) ........ 47,48
Tape guide (latest design) . . . . . . . . 48
Tape guide spring . . . . . . . . . . . . . 48
Tape shoe torsion spring. . . . . . . . . 4 7
Toggle bail eccentric
(preliminary) . . . . . . . . . . . . . . • . 31
Toggle operating arm . . . . • • . . . • . 31
Punch Mechanism for Chadless Tape
Bias spring (punch block) .......•
Bias spring (tape chute) ........ .
Detent lever .•.....•.....•••.
Feed hole lateral alignment ...•...
Punch pin penetration . . . • • . • • . ••
Punch slide downstop plate
position ............••••.•••
Punch slide guide .•..•.••.••...
Punch slide spring ...•. L .•••..
Reperforator mounting .•...•••..
Retractor bail springs ......•..•
Tape guide assembly spring .•••...
Ten characters per inch (final) ..•.•
Ten characters per inch
(preliminary). • . . . • • • • • . • • • • • .
Punch Mechanism for Fully
Perforated Tape
Bias spring (punch block) •••.••.••
Bias spring (tape chute) •••.••••••
Punch pin penetration ..•••••••••
Punch slide downstop
position .......•.•.•••••••••
Punch slide guide {final) .•..•••••
Punch slide latch spring ....••.••
Punch slide spring . • . . • • • • • • • • .
Tape guide assembly spring ••.•••
40
40
37
38
32
32
32
39 '
36
39
40
36
36
45
45
33
33
33
27
45
45
© 1958, 1959, 1960, 1961, 1962,
and 1963 by Teletype Corporation
All rights reserved
Printed in U.S.A.
Page 1

Summary

1. GENERAL

2. BASIC UNITS

2.01 Selector and Function Clutch Mechanisms

Details adjustments for selector and function clutch components.

2.15 Function Mechanism

Explains adjustments for the function mechanism components.

2.19 Punch Mechanism

Details adjustments for the punch mechanism mounting plate.

2.40 Typing Mechanism

Covers adjustments for the typing mechanism pushbar operation.

2.64 Ribbon Mechanism (Latest Design)

Describes adjustments for the latest ribbon feed mechanism.

2.67 Tape Printer Unit

Details adjustments specific to the tape printer unit.

3. VARIABLE FEATURES

3.01 Unshift-On-Space Mechanism

Covers adjustments for the unshift-on-space function blade and spring.

3.04 Code Reading Contact Mechanisms

Details adjustments for code reading contact mechanisms.

3.13 Contact Timing Measurements (To Zero Test Set)

Outlines procedures for contact timing measurements using a test set.

3.22 Manual and Power Drive Backspace Mechanism (For Chadless Tape)

Details backspace mechanism adjustments for Chadless Tape.

3.33 Automatic Noninterfering LTRS and BLANK Tape Feed Out Mechanisms

Describes automatic feed out mechanisms for LTRS and BLANK tape.

3.55 Timing Contact Mechanism (Operated by Selector)

Covers timing contact adjustments operated by the selector.

3.59 Blank Delete Mechanism

Details adjustments for the blank delete mechanism.

3.69 Time Delay Motor Stop Mechanism

Explains adjustments for the time delay motor stop mechanism.

4. EARLIER DESIGN MECHANISMS

4.01 Ribbon Feed Mechanism for Chadless Tape and Fully Perforated Tape

Covers earlier design ribbon feed mechanisms for tape types.

4.05 LETTERS-FIGURES Contact Mechanism

Explains earlier design LETTERS-FIGURES contact mechanisms.

4.06 Noninterfering BLANK Tape Feed Out Mechanism

Covers earlier design noninterfering BLANK tape feed out mechanisms.

4.13 Noninterfering BLANK Tape Feed Out Mechanism (continued)

Details noninterfering BLANK tape feed out mechanisms.

4.21 Multiple Mounted Function Blade Contacts

Covers multiple mounted function blade contact adjustments.

Teletype 28 Specifications

General

Manufacturer	Teletype Corporation
Model	28
Type	Electromechanical Teleprinter
Printing Method	Impact printing
Operating Speed	60 words per minute
Character Set	Baudot code
Paper Width	8.5 inches
Features	Automatic carriage return
Keyboard Layout	QWERTY