Ibm Selectric i/o Manual

Selectric

I/O

®

Keyboard Printer

Customer Engineering

Manual

of

Instruction

Issued to:

__________________

_

Branch

Office:

________________

_

Department:

________________

_

Address:

__________________

_

If

this

manual

is

mislaid,

please

return

it

to

the

above

address.

PREFACE

This manual has

been

written

to

include

the

maximum hardware or mechanisms

that

can

be

incorporated

in

the

"Selectric"

I/O

Keyboard

Printer

thru

October

1964.

The

particular

model you

are

concerned

with may not use

all

of

the

mechanisms

de-

scribed.

This manual covers models

731, 735, 765, 775,

1415,

1014,

Sabre,

Stretch,

7040/44,

1

620

Mod.

I\,

All rights

to

reproduce

this

material

are

reserved

by

IBM.

Address comments

regarding

the

comments

of

this publi

cation

to:

IBM

Office

Products Divi"sion,

Lexington,

Kentucky

40507

CONTENTS

Motor

and

Drive

...............................................................

1

Typehead

.............................

"

.......................................

3

Tilt

Mechanism

................................................................

5

Rotate

Mechanism

..............................................................

8

Keyboard

Section

and

Character

Selection

.........................................

12

Print

Selection

Unit

.....................

"

......................................

16

Selection

Contact

Assembly

.....................................................

18

Keyboard

Lock

.........................

"

......................................

20

Shift

.................................

"

......................................

22

Cycle Clutch

Operation

.........................................................

28

Alignment

...........................

','

......................................

29

Print

Mechanism

(Early

Style)

........

:

...........................................

39

Print

Mechanism

(Late

Style)

....................................................

41

Print

Escapement

......................•.....................................

41.5

Mainspring

.....................................•.............................

44

Operational

Cams

and

Control

Mechanism

.........................................

45

Operational

Selection

Unit

..............

','

......................................

49

Operational

Contact

Assembly

(Late

Style)

...............•.......................

50.1

Spacebar.

..

.

........................

,

.......................................

51

Spacebar

Mechanism

(Print

Escapement)

..........................................

54

Backspace

...........................

'

.•.....................................

54.1

Carrier

Return

(Early

Style)

.....................................................

55

Carrier

Return

(Late

Style)

...............•.....................................

58.1

Indexing

.......................................•............................

59

Platen

Variabl.e

...............................................................

62

Tabulator

.............................

','

......................................

63

Margin

Control

................................................................

69

Paper

Feed

and

Release ME:tchanism

..............................................

73

Fabric Ribbon

(Early

Style)

.......................................................

75

Red Ribbon

Shift

...............................................................

79

Fabric Ribbon

(Late

Style).

"

.........................................

,

...........

80

(2) INDEX SELECTION

LEVER

(I)COpy CONTROL

LEVER

(3)

PAPER RELEASE LEVER

(4)

PAPER

BAIL LEVER

(8)

(7)

ON/OFF

SWITCH

TAB

SET/CLEAR

SELECTRIC

1/0

KEYBOARD

PRINTER

Operating

Controls

1.

Copy

Control

Lever -To

compensate

for

the

thickness

of

multiple

forms,

the

copy

control

lever

is

provided.

As

the

copy

control

lever

is

moved

to

the

rear,

the

platen

wi

II

move

farther

away

from

the

typehead.

2.

Index

Selection

Lever

-

You

may

control

the

indexing

(line

space

movement)

of

the

platen

b)/

setting

the

index

selection

lever

forward

for

single

space

and

back

for

double

space.

3.

Paper

Re

lease

Lever

-

Move

the

paper

release

lever

forward

to

position

or

re-

move

paper.

4.

Paper

Bai I

Lever

-Holds

the

paper

against

the

platen

to

prevent

buckl

ing.

Should

be

moved

forward

when

inserting

paper.

5.

Margin

Set

Leve~

-

Provides

the

operator

with

a

means

of

changing

the

margin

settings.

6.

I

ndex

Key -

Provides

vertical

indexing

of

the

paper

without

changing

the

posi-

tion

of

the

carrier

assembly.

7.

On-Off

Switch

-Turns

the

pri

nter

on

and

off.

8.

Tab

Set/C

lear

-,

Used

to

set

or c I

ear

tab

stops.

9.

Margin

Release

Key -

Provides

a

means

of

operating

the

printer

beyond

the

margin

settings

without

changing

the

settings.

MOTOR

AND

DRIVE

The motor used in

the

Selectric

I/O

Printer

is

a

three-inch

shaded

pole,

induction

type: motor

that

requires 115

volts,

60

cycles

A.

C.

(Fig.

1).

I~

is

rated

at

1/35

h

.p.

The motor

is

mounted

at

the

left

rear

corner

of

the

machine

with

the

pulley

toward

the

right.

It

is

attached

to

an

ad~ustable

bracket

at

each

end

by

ring

shaped

spring

retainers

that

en-

eirc

Ie

the

rubber motor mounts.

3"

Shaded Pole Motor

Motor

Pulley

and

Clutch

Mechanism

FIGURE

1.

Shaded Pole Motor

The motor may be removed easi

Iy

after

snapping

the

retainers

off

the

brackets.

With

the

belt

removed

the

right

end

of

the

motor may be moved

to

the

rear,

and

the

motor may be removed

toward

the

right.

With

this

bracket

design,

the

force

of

the

motor in

operation

is

against

the

bracket

rather

than

against

the

retaining

clips.

The motor bearings

are

babbit

inserts pressed

solidly

into

the

motor

end

bells.

Each

bearing

is

completedy surrounded by a

saturated

oil

wick.

Asmall square

wick

fits

into

a

notch

inthe

top

of

each

bearing

to

supply oil

directly

11'0

the

rotor

shaft.

1

It should seldom be necessary

to

disassemble

the

motor;

however,

care

should be

taken

in

replacing

either

end

bell

that

is

not

in-

vertedwhen

installed.

The oil hole in

the

left

end

bell

and

the

notch

in

the

bearing

would

then

be on

the

bottom.

The

starting

torque

for

the

motor

is

provided by

the

shaded

pole

principle.

No

capacitor

is

required.

The motor has

an

internal

circuit

breaker

to

prevent

damage

to

the

field

coil in

the

event

the

switch

is

left

ON

with

the

ma-

chine

stalled.

The

circuit

will

open

only

if

the

motor

is

allowed

to

remain

stalled

for a period

of

time;

therefore

there

is no

dangerof

an

open

circuit

during normal

operation.

The motor

will stall

only

in rare cases where a maladjustment

or

parts

breakage

causes

the

machine

to

lock.

After

the

motor has

re-

gained

normal

temperature,

the

circuit

breaker

wi

II

again

close

the

circuit.

The

circuit

breaker

will

continue

to

open

and

close

as long as

the

motor

is

stalled

and

the

switch

is

left

ON.

Because

of

its

design,

the

shaded pole motor tends

to

run

at

a

higher

temperature

than

other

IBM

typewriter

motors.

Core

should be

taken

in handling

the

motor

to

prevent

being

burned.

In

order

to

prevent

over-heating,

a cooling system is

incorpo-

rated

in

the

design

of

the

motor. A fan

attached

to

the

right

end

of

the

rotor pulls

air

through

the

left

end

bell

and

across

the

field coi Is. The

air

is

then

discharged through a

duct

at

the

right

rear

corner

of

the

motor. The

air

escapes

through a

grill in

the

rear

of

the

machine

cover.

The hot

air

being

dis-

charged

pulls cool

air

with it

from

within

the

machine.

The

air

that

ultimately

emerges

from

the

machine

is

cooled

to

near

room

temperature

so

that

no

objectionable

heat

results.

The

three

wire grounded system has

the

third line cord

lead

attached

to

the

powerframe

at

the

cord c

Ii

p

screw.

A short

jumper wire

is

connected

between

the

motor

and

powerframe

(Fig.

2).

White

Green

Solderless

Connector

Black

Plug

Switch

FIGURE

2.

Shaded Pole Motor Diagram

In

some

Selectric

I/O

Printers, a

capacitor-start

induction

type

motor is used

(Fig.

3).

A

capacitor,

in

the

starting

winding

circuit,

provides a starting torque for

the

motor

and

controls

the

direction

of

rotation.

The

capacitor

also

re-

mains in

the

circuit

whi

Ie

the

motor

is

running.

The

capaci-

tor

is

mounted in a vel:tical position by a

bracket

at

the

right

rear

corner

of

the

machine.

FIGURE

3.

Capacitor-Start

Motor

The

capacitor

start

three

wire

grounded

system has in

addi-

tion

to

the

three

wire

line

cord

and

jumper

wire

a

grounded

capacitor

mounting

bracket.

This

is

done

by

using

metal

mounting screws

(Fig.

4).

Green

-

Run

Motor

White

Green

Black

Plug Solderless

Connector

FIGURE

4.

Capacitor-Start

Motor Diagram

The switch

and

switch

lever

are

mounted

on

the

right side

of

the

keyboard.

The switch

lever

operates

the

electrical

switch

by means

of

a short Iink

extending

to

the

rear.

It

is

operated

by pressing down on

the

rear

of

the

lever

to

turn

the

machine

ON

and

the

front

to

turn

the

machine

OFF.

The switch

lever

is

labeled

ON

and

OFF.

When

the

switch

lever

is in

the

ON

position,

a

contrasting

color

at

the

front

of

the

switch

lever

shows just

above

the

case.

This

calls

attention

to

the

fact

that

the

machine

is

ON

to

minimize

chances

of

the

machine

being

left

running when

not

in

use.

In

addition

to

operating

the

typewriter

switch,

the

switch

lever

also

controls

the

keyboard

lockout

mechanism.

This mechanism

is discussed in

the

keyboard

section.

Motor

Contactor

(835 Printer)

Mounted

underneath

the

printer

near

the

shift

feedback

con-

tact

bracket

is

the motor

contactor

(Fig.

4.1).

The motor

con-

tactor

is

a 48V

relay

that

works in

conjunction

with

the

as-

sociated

electronics.

If

the

printer

ON/OFF

switch

is

in

the

ON

position

and

the

Communicate-Local

switch

is

in

Commu-

nicate,

the

printer

motor

can

be

turned

OFF

and

ON

by

the

motor

contactor

(Fig.

4.2).

Shield

Motor

Contactor

-lI....,r;•

...1~

Terminal

•

White

Green

Black

Plug

E

~

...

IIC Z \

..

".J

~

....

0 i z 2 3

$ z

~

I

:;

~

§ .. I

<

::i

FIGURE

4.1

Motor

Contactor

To

Power Supply

Grn

Wht

Blk

Motor

Contactor

• FIGURE

4.2

Motor Diagram

(835

Printer)

2

Shift

Contact

Actuating

Arm

Drive

An

eight-toothed

motor

pulley

provides positive drive for

the

operation

of

the

machine.

A

positive-drive

belt

transfers

the

rotation

of

the

motor

pulley

to

the

cycle

clutch

pulley

with a

speed reduction

of

3-5/8

to

1.

The shaded pole motor has less starting torque

than

the

cape-

ci

tor-start

motor •

To

insure

that

the

motor

wi

II

be a 1I0wed

to

start under a heavi

Iy

loaded conditi

on,

a

centrifuga

I

clutch

has been

incorporated

in

the

motor

pulley

design.

The motor

is

allowed

to

approach

normal operating

speed,

then

the,

clutch

engages

to

drive

the

machine.

The momentum

devel-

oped by

the

rotor causes

the

machine

to

start

even

though

several

mechanisms may have been tripped.

Capacitor

start

motors do not

require

a

centrifugal

clutch.

The motor

pulley

operates

freely on

the

end

of

the

rotor shaft

and

is

held in

place

bya grip ring

retainer.

Three

ratchet

teeth

extend

radially

from

the

left

end

of

the

pulley

(Fig.

5).

A

clutch

plate

hub assembly

is

set-screwed

to

the

rotor shaft just

to

the

left

of

the

motor

pulley.

Pivoted on

the

plate

are

two

clutch

pawls

(Fig.

5).

When

the

motor is

OFF,

the

pawls

are

spring loaded

against

stop lugs on

the

clutch

plate.

When

the

motor

is

turned

ON,

the

clutch

plate

turns with

the

rotor.

Centrifugal

force causes

the

clutch

pawls

tC)

pivot on

the

studs

of

the

cI

utch

plate

so

that

the

tip

of

one

of

the pawls

engages

a tooth

of

the

motor

pulley

(Fig.

5).

The

pulley

is

then

caused

to

rotate

and

drive

the

machine by means

of

the

cycle

clutch

pulley.

Motor Pulley

Clutch

Plate

Hub Assembly

FIGURE

5.

Motor Pulley

Clutch

The

cycle

clutch

pulley

is

mounted to a hub in

the

center

of

the

powerframe. The hub

is

supported by a porous bronze

bear-

ing and

is

in continuous rotation with

the

pulley

whenever

the

motor

is

runni

ng

.

On

eitherside

of

the

cycle

clutch

pulley

hub

is

a shaft

extend-

ing into

and

supported by

the

hub

(Fig.

6).

The shaft to

the

left

of

the

hub is

called

the

cycle

shaft.

The

cycle

shaft

is

driven by means

of

a spring

clutch.

The

clutch

is

allowed

to

engage

whenever

a

character

keylever

is

depressed.

The

cy-

cle

shaft powers the positioning

of

the

typehead

to the desired

character.

Its rotation

is

re$tricted

to

180

0

each

time a

char-

acter

prints. After

180

0 rotation

the

spring

clutch

is

disen-

gaged

allowing

the

shaft to remain

stationary.

The

cycle

clutch

is discussed fully in a

later

section.

2.1

Print Shaft

lFi

I

ter

Shaft

FIGURE

6.

Drive Mechanism

Through a series

of

idler

gears

at

the

left,

two

other

shafts

are

driven by

the

cycle

shaft

~ach

time

it

operates

(Fig.

6).

They

are

the

filter

shaft

and

the

print

shaft.

The

filter

shaft

oper-

ates

the

characterselectior.l mechanisms,

the

print

escapement,

the

shift

interlock,

and a

spacebar

lockout

device.

The print

shaft

operates

the print mechanism, type

aligning

mechanism,

and

ribbon feed and lift mechanisms.

The shaft

to

the

right

of

the

cycle

clutch

pulley

hub is

the

operational

cam shaft

(Fig.

6).

All powered functional

oper-

ations

are

driven by its

rotation.

The functions involved

are

spacebar,

backspace,

tabulation,

carrier

return,

indexing,

and

shift.

The shaft also controls

the

speed

of

the

carrier

during a

tab

operation.

Each

of

the

functions

is

discussed in

detail

in

its own

section.

The

operational

cam shaft is driven by

the

cycle

clutch

pulley

hub and

isin

continuous rotation

whenever

the

motor

is

running.

The right end

of

the

shaft

operates

in a

self-aligning

porous

bronze

bearing.

The

left

end

extends

into

the

cycle

c1utclh

pulley

hub where

it

is

supported by a vinyl

sleeve

(Fig.

7).

The

sleeve

provides a snug fit for

the

shaft in

the

hub

to

pre-

Cycle

Clutch

Pulley

Hub

Torque Limiter

Hub

Sleeve

FIGURE

7.

Operational

Cam Shaft Drive

Connection

3

vent

any

noise due

to

vibration.

The driving

connection

be-

tween

the

cycle

clutch

pulley

hub

and

the

operational

shsft is

made by two extensions

of

the

hub

that

fit into

cut-outs

in

the

left

side

of

the

torque limiter

hub.

The torque limiter hub is

held

in position

at

the

extreme

left

end

of

the

shaft by two set

screws. Two nylon inserts fit into

the

cut-outs

of

the

torque

limiter

hub (around

the

extensions

of

the

cycle

clutch

pulley

hub).

The inserts provide a noiseless driving

connection

be-

tween

the

two hubs.

Just

to

the

right

of

the

torque limiter hub

are

three

spring

clutches

and

two small pinion

gears.

These components

are

part

of

the

carrier

return

and

tab

mechanisms

and

are

di~ussed

in

their

particular

sections.

TYPEHEAD

Carrier

Assembly

The printing

element

is a ball shaped

typehead

containing

eighty-eight

characters.

The

type

head

is supported in front

of

the

paper

by a framework

called

the

carrier.

The

carrier

is

the

box-shaped

casting

that

moves

laterally

just in front

of

the

platen

(Fig.

8).

Its purpose

is

to

transport

the

type

head

and

other

along

the

writing

line.

Almost

the

entire

print mechanism

is

contained

within

the

carrier

as-

sembly.

In

addition,

the

carrier

also supports

the

ribbon,

rib-

bon feed and

lift

mechanisms,

and

a

bracket

that

controls

the

left

and

right margins on

the

paper.

FIGURE

8.

Front

Carrier

Support

At

the

front

of

the

carrier,

a

sleeve

fits into two bronze

bear-

ings in

the

carrier

(Fig.

8).

The

sleeve,

called

the

print

sleeve,

must rotate

within

the

carrier.

It

also slides

left

to

right on

the

printshaft

to

provide

the

front support for

the

car-

rier.

An

oil soaked

felt

ring surrounds

the

print shaft

and

is

enclosed

in a

retaining

cup

at

each

side

of

the

carrier.

As

the

carrier

moves,

the

felt

ring,

called

the

print shaft

wiper,

spreads a light film

of

oil

on

the

shaft

to

lubricate

the

sliding

ofthe

print

sleeve.

Oil

from

the

print shaft wipers is also

ab-

sorbed by

the

bearings in

the

carrier

casting

to

lubricate

the

rotation

of

the

print

sleeve.

IBM Selectric I/O Manual

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