Singer 591UTT User manual

SINGER

591

UTT

Service

Manual

From the library of: Superior Sewing Machine & Supply LLC

CONTENTS

Page

No.

Description

UnderbedThread Trimmer

2-15

Principal

Parts

2-3

DriveSystem of Thread Trimmer 2

Pullingand TrimmingUnit 2

Tension Releaseand MovableSlack Thread Regulator 3

Descriptionof TrimmingOperation

3-6

Timing and Setting

6-15

Adjustment of NeedleStop Positions

6-8

Timing—Actuation

Trimmer Solenoid 8

Timing —Completion

Actuation

Trinuner Solenoid

8-9

Setting

Trimmer Solenoid 9

Setting

Stationary Knife 9

Setting

Thread Puller

9-10

Adjustment

Pressure

Thread Puller Against Stationary Knife

10-11

Timing and Setting of Thread Puller Action Cam

11-12

Timing

Tension Release Action Cam 12

Setting

Thread PuUerAction Cam AdjustingPlate 13

Adjustment

Gap Between Tension Discs

13-14

Timing

Tension Release 14

Adjusting the Length

Needle Thread End

14-15

Adjustment

Thread Wiper 15

Back

Tack

Device

16-21

Principal Parts

16-17

Description of BackTacking Operation 18

Setting and Adjustment

BackTack Device

18-21

Setting

Back Tack Solenoid 18

Setting

Feed Rock Shaft DrivingFrame 19

Setting

Feed Rock Shaft DrivingFrame Action Shaft and Collar 19

Setting

Feed Rock Shaft DrivingFrame Action Lever

19-20

Feed Rock Shaft DrivingFrame Spring Tension 20

Setting of Feed Rock Shaft Driving Frame Stopper Spring 20

Setting

Push

Button

Switch 20

Adjustment

Push Button SpringTension 21

Cords

and

Connections

* A

Trademark

THE

SINGER

COMPANY

1981 THE SINGER COMPANY

All

Rights

Reserved

Throughout

the

World

From the library of: Superior Sewing Machine & Supply LLC

DESCRIPTION

electro-mechanical

underbed

thread

trimming

unit,

which

is an

integral

part of the

machine,

incorporated

in the "B"

variety machines.

The

machine

driven

by a

needle

positioner motor, and its

sensor

and controlbox

relay

the electronic

commands

to the

built-in

solenoids

the

machine.

The needle and bobbin threads are trimmed below the throat plate after the sewing operation.

A threadwiper

"Wipes"

the

needle

thread to proper positionfor startingthe next

sewing

operation.

In addition to the under bed thread trimming unit, a back tackingsystem is incorporatedin the "G"

variety

machines. The

automatic back tack switch and control box relay the electronic commandsto the built-insolenoidfor automatic back tacking

at start and at end of stitching. The push button switch

provided

adjacentto the

needle

barpermitsback

tacking

in the midst

the sewing operation.

This manual should be used in connection with the Service Manual Form U3208 for the regular 591 machine. It informs

especially regarding the operation and maintenance

the underbed thread trimmer and back tacking

device

and their

drive

systems.

From the library of: Superior Sewing Machine & Supply LLC

UNDERBED

THREAD

TRIMMER

PRINCIPAL

PARTS

Drive

System

Thread

Trimmer

THREAD

PULLER

ACTION

LEVER

LINK

THREAD

PULLER

ACTION

LEVER

THREAD

PULLER

THREAD

PULLER

ACTION

CAM

ADJUSTING

PLATE

TENSION

RELEASE

ACTION

PLATE

STATIONARY

KNIFE

/WVW/

ROTATING

HOOK

SHAFT

THREAD

PULLER

BRACKET

THREAD

PULLER

ACTION

CAM

FOLLOWER

TENSION

RELEASE

ACTION

CAM

THREAD

PULLER

ACTION

CAM

THREAD

PULLER

ACTION

PLATE

Fig. 1

Pulling and

Trimming

Unit

STATIONARY

KNIFE

Fig. 2

THREAD

PULLER

TENSION

RELEASING

WIRE

TRIMMER

SOLENOID

THREAD

PULLER

ADJUSTING

BLOCK

From the library of: Superior Sewing Machine & Supply LLC

Tension Release and Movable Slack Thread Regulator

SLACK

THREAD

REGULATOR

ACTION

PLATE

MOVABLE

SLACK

THREAD

REGULATOR

Fig. 3

DESCRIPTION

THE

TRIMMING

OPERATION

When

the foot treadle is returned to its neutral position

upon completion

the sewing cycle, the machine

stops approximately Smm (.118") beyond the bottom

dead center of the needle (Fig. 5, hook point in the

loop of needle thread) when the sensor plate A (red)

reaches a point shown in Fig. 6.

2. Heeling the foot treadle will start the machine to run

at the trimming speed (200 r.p.m).

SENSOR

PLATE

TENSION

RELEASING

CAM

TENSION

RELEASING

WIRE

Fig. 4

Fig. 5

Fig. 6

From the library of: Superior Sewing Machine & Supply LLC

The trimmer solenoid is energized when the sensor

plate B (yellow) reaches a point shown in Fig, 7.

SENSOR

PLATE

Fig. 7

When the cam follower on the thread puller action plate slips into the recessed portion

the thread puller action cam

adjustingplate, the thread puller is activated to move through the loop (Fig. 8) to a point shown in solid line in Fig.9,

and the needle and bobbin threads are positioned as shown also in Fig. 9. Simultaneously, the thread puller action plate

pushes

the tension

release

action plate

making

its pin ride on the tension

release

action cam. Immediately when the pin

rides on the tension

release

action cam,the electroniccommandrelayedfrom the sensorplate C (yellow,Fig. 10) cuts

off

the current supply to the trimmersolenoid. The

above

motion

makes

the tension

releasing

camrotate untiljust beforethe

tension

discs

are

released.

Fig. 8

NEEDLE

THREAD

BOBBIN

THREAD

Fig. 9

SENSOR

PLATE

Fig.

From the library of: Superior Sewing Machine & Supply LLC

5. As the needle thread is cast

off

the rotating hook, it

catches on the hook portion

the thread puller.

(Fig. 11)

6. The tension release action plate pin reaches the inclina

tion

the

tension

release

action

cam

and

starts

leasing the tension discs immediately after the needle

thread catches on

the

thread puller.

Fig. 11

While

the above takes place,the camfolloweron the thread pulleraction plate reachesthe inclinationon the thread puller

action camand the thread puller beginsto pull the bobbin and needlethreads toward the stationary knife.

The

bobbin

and

needle

threads

are

severed

when

the

cutting edge

the thread puller closes in against the

cutting edge

the stationary knife. (Fig. 12 and 13)

9. When the threads are trimmed, the spring biased

tension release action plate moves back to its rest

position

disengaging

its pin from the tension release

action cam and thus completesits function of

releasing

and holding the needle thread tension open.

10. The trimmer and tension releasing mechanisms return

to their rest positions upon completion

the

trimming operation and the machine stopsin the upper

needle position. When the sensor plate D (yellow)

reaches a point shown in Fig. 14.

200 type -

Approximately

1mm

(.039") before

take-

up leverreachesits upper dead center.

300 type —

Take-up

leverat its upper deadcenter.

SENSOR

PLATE

Fig. 14

CUTTING

EDGE

THREAD

PULLER

Fig. 12

CUTTING

EDGE

STATIONARY

KNIFE

From the library of: Superior Sewing Machine & Supply LLC

11. Upon completion of the trimming operation, the

thread wiper makes a

swivelling

movement to place

the needle thread in proper position for starting the

sewing operation.

TIMING

AND

SETTING

When

checking the operation

the trimmermechanism by manual actuation of the mechanisms.

a. Be sure to

tum

machine pulley over toward front

machine.

b. Push thread pulleraction plate toward cam when take-upleveris almost at its lower dead center.

NOTE:

The

thread

puller

may

strike

the

needle

and

damage

itself

and

the

needle

unless

the

thread

puller

action

plate

pushed

toward the cam as

described

above

since

the rotatinghook shaft

makes

two revolutions

against

onecycle

the

needle

bar.

sure

check

that the

machine

correctly

adjusted

before

making

adjustments

to the

trimmer

mechanism.

(Refer

ServiceManual Form U3208 for regular 591 machine).

Check

and

adjust

the

trimmer

mechanism

in the

order

instructed

this

manual

since

it is

interlocked

with

many

other

area.

Adjustment

Needle

Stop

Position

When

checking

and

making

adjustments

needle

stop

positions,

sure

disconnect

the

trimmer

and

wiper

connectors

from

the

control

box.

Needle Stop Positions

Lower

Needle

Position

The

lower

needle

position

approximately

3mm

(.118")

beyond

the

bottom

dead

center

ofthe

needle.

This

1st

position

does

not

call

for

absolute

accuracy

and

minor

adjustments

may

made

ifthe

threads

cannot

properly

trimmed

dueto

skip stitching.

b. Upper NeedlePosition

The

upper

needle

position

of the

200

type

machine

approximately

1mm

(.039")

before

the

take-up

lever

reaches

its

upper

dead

centerand the upper

needle

position

of the 300 type

machine

when

the

take-up

lever

is at itsupper

dead

center.

Adjust

upper

needle

positionas accurately as

possible

running

andstopping

machine

several

times

to checkfor correct

position.

From the library of: Superior Sewing Machine & Supply LLC

Adjustments

sensors

are

correctly

timed

andset

before

leaving

the

factory.

If,

however,

this

timing

setting

has

been

disturbed

and

retiming

resetting

becomes

necessary,

adjust

bycorrectly

positioning

the

sensor

plates.

1. The positions of the

sensor

plates

(for upper and

lower

needle

positions and for controlling the

trimmer

solenoid)

relation

to the

sensor

set

screw

should

be as

shown

Fig.

15. To

adjust

the

position

of a

sensor

plate,

loosen

screw

end of the sensorandturn

sensor

plateasrequired,then tightenthe

screw.

SENSOR

PLATE

C —

(TRIM.

SOLENOID

"OFF")

SENSOR

SET

SCREW

Fig.

39'

SENSOR

SET

SCREW

SENSOR

PLATE

(UPPER

NEEDLE

POS.)

149'

SENSOR

PLATE

(LOWER

NEEDLE

POS)

SENSOR

PLATE

(TRIM.SOLENOID

"ON")

Position sensor on hub

machine pulley so that its second set screw (set screw which appears immediately after the first

set screw when sensor is rotated over toward the operator) is alignedwith the second set screw

the machine pulley and

firmly tighten the two set screws. (See Fig. 16)

ALIGN

SET

SCREW

MACHINE

PULLEY

MACHINE

PULLEY

SET

SCREW

SENSOR

SET

SCREW

Fig.

From the library of: Superior Sewing Machine & Supply LLC

Use

sensor

retainer

supplied

withthe

machine

andbe

sure

it is

correctly

secured

position.

Note:

The

sensor

plate

for

upper

needle

position

should

not be

reset

inorderto

solve

the

problem

tension

releasing

mechanism

not

being

released

when

needle

stopsin the upper

needle

position.

Thisadjustment

should

bemadeby resetting the sensorunit on the hub of

machine

pulley

asinstructed

below.

Loosen

the two set

screws

holding

the

sensor

unit and

while

holding

the sensorwithonehand,turn

machine

pulley

slightly over toward

the

front

machine.

b. Hold sensorin this position and temporarily tighten the first

screw.

c. Run

machine

and checkwhether the tension

releasing

mechanism

released

when the

needle

stops in the upper

position. Repeat above, if necessary.

d. Firmly tighten

both

first

and

second set screws.

Timing

—

Actuation

Trimmer

Solenoid

The trimmer solenoid is actuated when the take-up lever

reaches

a point

lOmm

(.394") before its lower dead center. The

timing

of this actuationis controlled by the

sensor

plateBin the

sensor

unit. (Referto item3 underDescription of

Trimming

Operation).

Timing

—

Completion

Actuation

Trimmer

Solenoid

The current supply to the trimmersolenoid is cut off completing its actuation when the tension

release

action plate pinis in

the

range

shown

in Fig. 17.Thistimingis controlledby the sensorplate Candwhenadjustmentisnecessary, reset thissensor

plate.

Turn machine pulley until the clearance between tension

release

action plate pin and tension

release

action cam is approxi

mately 1mm(.039") (Fig. 17) and whileholdingthe machinepulley in this position, set sensorplate C asshownin Fig. 18.

TENSION

RELEASE

ACTION

CAM

TENSION

RELEASE

ACTION

PLATE

APPROX.

1.0

Fig. 17

Fig.

SENSOR PLATE C

From the library of: Superior Sewing Machine & Supply LLC

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