Union Special 35800 Parts List

®

Feed-off-the arm, 3-Needle, Double Chainstitch Machine

35800 Series

ENGINEER’S MANUAL

40052737

No.E376-00

Introduction

This Engineer’s Manual is written for the technical personnel who are responsible for the service and maintenance of the machine.

The maintenance services to be done on this sewing machine should be based on this manual.

This manual gives the "Standard Adjustment" on the former section under which the most basic adjustment value is described and on the latter section the "Results of Improper Adjustment" under which stitching errors and troubles arising from mechanical failures and "How To Adjust" are described.

CONTENTS

1.	Specifications ........................................................................................................			1
	(1)	Roller mechanism/clutch type ...............................................................................................		1
	(2)	Roller mechanism/belt type ...................................................................................................		2
2.	Model list ................................................................................................................			3
	(1)	Model list using the roller mechanism of the clutch type ...................................................		3
	(2)	Model list using the roller mechanism of the belt type .......................................................		3
3.	Description of US model code ....................................................................			5
4.	Description of model code ..........................................................................			6
5. Names of machine head ..............................................................................				7
6. How to pass the threads..............................................................................				8
	(1)	Differential feed.......................................................................................................................		8
	(2)	1 piece feed .............................................................................................................................		9
7. Standard adjustment ............................................................................................				10
	(1)	How to remove the gauge components and upper feed roller .........................................		10
		(differential feed mechanism and 1 piece feed mechanism)
	(2)	Timing between the looper and needle bar ........................................................................		12
	(3)	Adjustment of the needle entry positions in the right-left and front-rear directions .....		14
	(4)	Looper adjustment ...............................................................................................................		16
		1)	Looper return .....................................................................................................................................	16
		2)	Adjustment of the clearance between the looper and needle ............................................................	16
	(5)	Adjustment of the needle bar height ..................................................................................		18
	(6)	Adjustment of the looper motion paths ..............................................................................		20
	(7)	Adjustment of rear needle guide .........................................................................................		22
		1)	Longitudinal adjustment of the rear needle guide ..............................................................................	22
		2)	Height adjustment of rear needle guide .............................................................................................	22
	(8)	Adjustment of feed dog height and longitudinal movement
		(differential feed dog mechanism) ......................................................................................		24
		1)	Height of main feed dog .....................................................................................................................	24
		2)	Height of differential feed dog ............................................................................................................	24
		3)	Adjustment of longitudinal movement of main feed dog ....................................................................	24
		4)	Adjsutment of vertical height of main feed dog and differential feed dog ..........................................	24
		5)	Gradient of main feed dog and differential feed dog .........................................................................	24
	(9)	Adjustment of feed dog height and longitudinal movement
		(1 piece feed dog mechanism) ............................................................................................		26
		1)	Height of main feed dog .....................................................................................................................	26
		2)	Adjustment of longitudinal movement of main feed dog ....................................................................	26
	(10) Adjustment of feed mechanisms ........................................................................................			28
		1)	Adjustment of stitch length .................................................................................................................	28
		2)	Adjustment of differential feed amount ..............................................................................................	28
	(11) Presser adjustment ..............................................................................................................			30
		1)	Adjustment of amount of rise of presser ............................................................................................	30
		2)	Adjustment of presser bar pressure ...................................................................................................	30

(12) Adjustment of upper feed roller ..........................................................................................	32
(13) Replacement of upper feed roller ........................................................................................	34
(14) Adjustment of drawing amount of upper feed roller .........................................................	36

	(15) Adjustment of needle thread path .......................................................................................	38
	1) Height of needle thread adjusting path ..............................................................................................	38
	2) Height of rocking take-up path ...........................................................................................................	38
	3) Height of needle thread guide adjuster ..............................................................................................	38
	(16) Adjustment of bobbin thread cam ......................................................................................	40
	(17) Adjustment of tension disk rise ..........................................................................................	42
	(18) Adjustment of air nozzle (air blow) .....................................................................................	44
	(19) Adjustment of folder ............................................................................................................	46
8.	Lubrication ...........................................................................................................	48
9.	Folder types .........................................................................................................	49
10. Maintenance ........................................................................................................		50
	(1) Spare parts .............................................................................................................................	50
11. Part numbers and names of the modification parts for the
	35800 Class – B8/B9 soft chain stitches (balloon stitches) ............................	52
12. Troubles and corrective measures ...........................................................		53

1. Specifications

(1) Roller mechanism/clutch type

	No.	Model					Specifications
		Item	35800DLU9		35800DNU8/9		35800DZ32/36	35800DRU8/9	35800PZ32/36		35800DWW8/9
	1	Stitch type			3-needle, 6-thread, double chainstitch machine (401 LSc-3)
	2	Application				Denim, working clothes, felt, etc.
	3	Max. sewing speed					4500 rpm
	4	Sewing speed					3500 rpm
	5	Needle gauge				8 gauge: 3.2 mm, total width: 6.4 mm
						9 gauge: 3.6 mm, total width: 7.2 mm
	6	Stitch length			2.1 to 3.6 mm (standard: 3.2 mm) at 1-inch intervals
	7	Needle (standard size)				UY130GS (standard) (Caution 1)
			125 (#21)					140 (#24)
	8	Needle bar stroke					33mm
	9	Number of threads					6 pcs.
	10	External dimensions				H : 420 x W : 285 x D : 345 mm
	11	Machine head weight					23.5 kg
	12	Lifting amount of presser					9mm				10mm
	13	Feed roller width					11.9mm				14.9mm
	14	Feed roller shape	Standard				Inverted	Standard		Inverted	Standard
			(narrow type)				(narrow type)	(narrow type)		(narrow type)	(wide type)
				Main feed: Slide type stitch pitch adjusting system
	15	Feed adjustment			Differential feed						Differential feed
			lever adjusting system					1 piece feed			lever adjusting
											system
	16	Lubrication				Automatic rotary pump lubrication system
	17	Lubricating oil				Union Special Spec 175 (ISO grade 22) or
							JUKI OIL SUP2000-1L
	18	Oil tank capacity				Front tank capacity: 70 to 80 ml
						Rear tank capacity: 60 to 70 ml
	19	Installation					Pedestal type
							Table and auxiliary drive type
	20	Working temperature/	Temperature: 5 - 35°C, humidity: 35 - 85% (No dew condensation permissible)
		humidity ranges
	21	Supply voltage/frequency					Rated voltage ±10%, 50/60Hz

(Caution 1) Please be aware that many customers use the needle of UY128GLS with the needle size of 125 (No. 21) in Japan and check the needle number at shipment.

– 1 –

(2) Roller mechanism/belt type

	No.	Model			Specifications
		Item	35800BLW9	35800BQW8/9	35800BWDN8/9	35800BWDR8/9	35800BRWH9		35800BWW8/9
	1	Stitch type		3-needle, 6-thread, double chainstitch machine (401 LSc-3)
	2	Application		Denim, working clothes, felt, etc.
	3	Max. sewing speed			4500rpm
	4	Sewing speed			3500rpm
	5	Needle gauge		8 gauge: 3.2 mm, total width: 6.4 mm
				9 gauge: 3.6 mm, total width: 7.2 mm
	6	Stitch length		2.1 to 3.6 mm (standard: 3.2 mm) at 1-inch intervals
	7	Needle (standard size)		UY130GS (standard) (Caution 1)
			125 (#21)	140 (#24)
	8	Needle bar stroke			33mm
	9	Number of threads			6 pcs.
	10	External dimensions		H : 420 x W : 285 x D : 345 mm
	11	Machine head weight			23.5kg
	12	Feed roller width			14.9mm
	13	Feed roller shape			Standard			Rubber	Standard
					(wide type)			(wide type)	(wide type)
	14	Lifting amount of presser			9mm				10mm
			Main feed: Slide type stitch pitch adjusting system
	15	Feed adjustment	Differential feed		Differential feed
			lever adjusting	1 piece feed	lever adjusting			1 piece feed
			system		system
	16	Lubrication		Automatic rotary pump lubrication system
	17	Lubricating oil		Union Special Spec 175 (ISO grade 22) or
					JUKI OIL SUP2000-1L
	18	Oil tank capacity		Front tank capacity: 70 to 80 ml
				Rear tank capacity: 60 to 70 ml
	19	Installation			Pedestal type
					Table and auxiliary drive type
	20	Working temperature/	Temperature: 5 - 35°C, humidity: 35 - 85% (No dew condensation permissible)
		humidity ranges
	21	Supply voltage/frequency		Rated voltage ±10%, 50/60Hz

(Caution 1) Please be aware that many customers use the needle of UY128GLS with the needle size of 125 (No. 21) in Japan and check the needle number at shipment.

– 2 –

2. Model list

The standard model is the feed-off-the-arm 3-needle, double chainstitch machine for double lap seam

(1) Model list using the roller mechanism of the clutch type

Needle

Number of

Needle gauge

Number of

Differential

Lifting

Upper puller

Roller width

Roller

Optional roller

Presser

Unevenness

Feed shape

Standard

Sewing

Max.

No.

Model

Application

Number of needles

threads

8ga-3.2mm

stitches (mm)

amount

shape

width

type folder

speed

sewing

3 pieces as

6 pieces as

8 stitches as

motion

of

drive

of throat

(side view)

speed

(front view)

(rpm)

standard

standard

9ga-3.6mm

standard

presser

plate

(rpm)

1

35800DNU8

Double lap seam, hip overlapped seam

130GS

3.2+3.2

2.1 to 3.6mm

Standard

Inverted type

6.4mm

type narrow

narrow roller

23420

3500

(Denim fabric of 10 to 14 oz.)

Yes

4500

(140)

4-6

(at 1-inch intervals)

9mm

Clutch type

11.9mm

(35875AW)

AY18-1/8

3.6+3.6

roller

2

35800DNU9

Rubber type narrow

Narrow

2.4mm

For medium-weight to heavy-weight materials

2-3

7 to 12 stitches

(35875AV)

7.2mm

roller (35826EF)

3

35800DZ32

Double lap seam, hip overlapped seam

130GS

3.2+3.2

2.1 to 3.6mm

Inverted

Standard type

23420

(Denim fabric of 10 to 14 oz.)

4-6

6.4mm

Yes

9mm

Clutch type

11.9mm

type narrow

narrow roller

3500

4500

(140)

(at 1-inch intervals)

(35875AV)

AY18-1/8

4

35800DZ36

2-3

3.6+3.6

7 to 12 stitches

roller

Rubber type narrow

Narrow

2.4mm

For medium-weight to heavy-weight materials

7.2mm

(35875AW)

roller (35826EF)

5

35800DRU8

Double lap seam

130GS

3.2+3.2

2.1 to 3.6mm

Standard

Inverted type

6.4mm

narrow roller

23420

Denim (denim fabric of 10 to 14 oz.)

(140)

4-6

(at 1-inch intervals)

No

9mm

Clutch type

type narrow

3500

4500

11.9mm

(35875AW)

3.6+3.6

roller

0.8 mm of

AY18-1/8

6

35800DRU9

2-3

7 to 12 stitches

Rubber type narrow

Narrow

2.4mm

For medium-weight to heavy-weight materials

7.2mm

(35875AV)

roller (35826EF)

unevenness

7

35800PZ32

Double lap seam

130GS

3.2+3.2

2.1 to 3.6mm

Inverted

Standard type

23420

Denim (denim fabric of 10 to 14 oz.)

(140)

4-6

6.4mm

No

9mm

Clutch type

11.9mm

type narrow

narrow roller

3500

4500

(at 1-inch intervals)

(35875AV)

AY18-1/8

8

35800PZ36

2-3

3.6+3.6

7 to 12 stitches

roller

Rubber type narrow

Narrow

2.4mm

0.8 mm of

For medium-weight to heavy-weight materials

7.2mm

(35875AW)

roller (35826EF)

unevenness

9

35800DWW8

Double lap seam/high throw feed eccentric mechanism

130GS

3.2+3.2

2.1 to 3.6mm

Standard

Inverted type wide

23420

3500

4500

Denim (denim fabric of 15 to 14 oz.), felt, etc.

(140)

4-6

6.4mm

(at 1-inch intervals)

Yes

10mm

Clutch type

type wide

roller (35826CB)

3.6+3.6

14.9mm

roller

Rubber type wide

0.8 mm of

AY18-1/8

10

35800DWW9

2-3

7 to 12 stitches

roller (35826DZ)

Wide

2.4mm

For heavy-weight to extra-heavy-weight materials

7.2mm

(35826X)

unevenness

(2) Model list using the roller mechanism of the belt type

Needle

Number of

Needle gauge

Number of

Lifting

Roller width

Roller

Optional roller

Presser

Unevenness

Feed shape

Standard

Sewing

Max.

Number of needles

threads

stitches (mm)

Differential

amount

Upper puller

shape

type folder

sewing

No.

Model

Application

3 pieces as

6 pieces as

8ga-3.2mm

8 stitches as

motion

of

drive

width

of throat

(side view)

speed

speed

standard

standard

9ga-3.6mm

standard

presser

(front view)

plate

(rpm)

(rpm)

1

35800BLW9

Double lap seam, denim (denim fabric of 6 to 9 oz.),

130GS

4-6

3.6+3.6

2.1 to 3.6mm

Yes

9mm

Belt type

14.9mm

Standard

Inverted type wide

23420

3500

4500

working clothes, working pants, etc

(125)

(at 1-inch intervals)

type narrow

Rubber type wide

roller (35826CB)

2-3

7.2mm

7 to 12 stitches

roller

roller (35826DZ)

Wide

1.0mm

AY18-1/8

For light-weight to medium-weight materials

(35826X)

2

35800BQW8

Double lap seam,

130GS

3.2+3.2

2.1 to 3.6mm

Standard

Inverted type wide

6.4mm

type narrow

roller (35826CB)

23420

denim (denim fabric of 6 to 9 oz.), jacket, working clothes, etc.

(125)

4-6

(at 1-inch intervals)

No

9mm

Belt type

14.9mm

3500

4500

3

35800BQW9

3.6+3.6

roller

Rubber type wide

1.0mm

AY18-1/8

2-3

7 to 12 stitches

roller (35826DZ)

Wide

For light-weight to medium-weight materials

(35826X)

7.2mm

4

35800BWDN8

Double lap seam,

130GS

3.2+3.2

2.1 to 3.6mm

Standard

Inverted type wide

6.4mm

denim (denim fabric of 10 to 14 oz.)

(140)

4-6

(at 1-inch intervals)

Yes

9mm

Belt type

14.9mm

type narrow

roller (35826CB)

23420

3500

4500

Rubber type wide

5

35800BWDN9

2-3

3.6+3.6

7 to 12 stitches

roller

roller (35826DZ)

Wide

2.4mm

AY18-1/8

For medium-weight to heavy-weight materials

7.2mm

(35826X)

6

35800BWDR8

Double lap seam,

130GS

3.2+3.2

2.1 to 3.6mm

Inverted

Inverted type wide

4-6

6.4mm

No

9mm

Belth type

type narrow

roller (35826CB)

23420

denim (denim fabric of 10 to 14 oz.)

(140)

(at 1-inch intervals)

14.9mm

3500

4500

Rubber type wide

3.6+3.6

roller

0.8 mm of

7

35800BWDR9

2-3

7 to 12 stitches

roller (35826DZ)

Wide

2.4mm

AY18-1/8

For medium-weight to heavy-weight materials

7.2mm

(35875AW)

unevenness

Double lap seam,

130GS

2.1 to 3.6mm

Standard

Standard type

3.6+3.6

type wide

wide roller

23420

8

35800BRWH9

(denim fabric of 10 to 14 oz.)

(140)

4-6

(at 1-inch intervals)

No

9mm

Belt type

14.9mm

(35826X)

3500

4500

7.2mm

roller

Wide

2.4mm

AY18-1/8

2-3

7 to 12 stitches

Rubber type wide

For medium-weight to heavy-weight materials

(35826X)

roller (35826CB)

9

35800BWW8

Double lap seam/high throw feed eccentric mechanism

130GS

3.2+3.2

Standard

Inverted type wide

6.4mm

2.1 to 3.6mm

234-20

Denim (denim fabric of 15 to 14 oz.), felt, etc.

(140)

4-6

(at 1-inch intervals)

No

10mm

Belt type

14.9mm

type narrow

roller (35826CB)

3500

4500

3.6+3.6

roller

Rubber type wide

0.8 mm of

AY18-1/8

10

35800BWW9

2-3

7 to 12 stitches

Wide

2.4mm

For heavy-weight to extra-heavy-weight materials

7.2mm

(35826X)

roller (35826DZ)

unevenness

* In regard to the JUKI part numbers, refer to [10. Maintenance-(1) Spare parts.]

– 3 –

MEMO

– 4 –

3. Description of US model code

Model name: Feed-off-the-arm, 3-Needle, Double Chainstitch Machine

1	2	3	4	5	6			7	8	9	10		11
3	5	8	0	0

Code	Puller drive
B	Belt type
D	Clutch type (mechanical type)
P	Same as "D", only for PZ

Code	Classification of needle gauge
8	3.2mm
9	3.6mm
32	3.2mm
36	3.6mm

	Code	Application and outline
		Differential feed mechanism/Double lap seam/For lightand medium-
	LW	weight materials (denim fabric of 6 to 9 oz.)/1 mm of throat plate un-
		evenness/Standard type wide roller equipped/Denim, jacket, working
		clothes, etc.
	QW	Same as above, but 1 piece feed mechanism
		Differential feed mechanism/Double lap seam/For mediumand heavy-
	WDN	weight materials (denim fabric of 10 – 14 oz.)/2.4 mm of throat plate
		unevenness/Standard type wide roller equipped/Denim, jacket, work-
		ing clothes, etc.
	WDR	Same as above, but 1 piece feed mechanism
	RWH	Same as WDN, but rubber type wide roller equipped
		Differential feed mechanism/Double lap seam/For mediumand heavy-
	NU	weight materials (denim fabric of 10 – 14 oz.)/2.4 mm of throat plate
		unevenness/Standard type narrow roller equipped/Denim, jacket, work-
		ing clothes, etc.
	RU	Same as above, but 1 piece feed mechanism
		Differential feed mechanism/Double lap seam/For heavy-weight ma-
	WW	terials (denim fabric of 15 – 16 oz.)/2.4 mm of throat plate uneven-
		ness/Standard type wide roller equipped/Denim, felt, etc.
	Z	Same as DNU and DRU, but inverted type narrow roller equipped

– 5 –

4. Description of model code

Machine name: Feed-off-the-arm, 3-needle, double chainstitch machine

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

3 5

8

0

0

–

A

A

6 to 10

Name

Sewing material

Stitch

Needle

Differential motion

Puller drive

Roller width

Roller shape

Unevenness

count

gauge

Yes

No

of throat plate

BLW

9

For lightand medium-

3

3.6mm

●

weight materials (6 to 9 oz.),

BQW

8

3

3.2mm

●

Belt type

14.9mm

1.0mm

denim, working clothes,

BQW

9

3

3.6mm

pants, etc.

●

BWDN 8

3

3.2mm

●

Steel gear

BWDN 9

3

3.6mm

●

BWDR 8

3

3.2mm

●

Belt type

14.9mm

BWDR 9

3

3.6mm

●

BRWH 9

3

3.6mm

●

Rubber roller

DNU

8

For mediumand heavy-

3

3.2mm

●

DNU

9

3

3.6mm

●

weight materials (10 to 14

Steel gear

DRU

8

oz.), denim, etc.

3

3.2mm

●

DRU

9

3

3.6mm

●

Clutch type

11.9mm

2.4mm

DZ

32

3

3.2mm

●

DZ

36

3

3.6mm

●

Steel gear

PZ

32

3

3.2mm

●

(inverted)

PZ

36

3

3.6mm

●

BWW

8

3

3.2mm

●

Belt type

For extra-heavy-weight

BWW

9

3

3.6mm

●

(15 to 16 oz.), denim, felt,

14.9mm

Steel gear

DWW

8

3

3.2mm

etc.

●

Clutch type

DWW

9

3

3.6mm

●

– 6 –

5. Names of machine head

Belt drive upper

feed roller

Clutch drive upper feed roller	End cover	Gear cover (front)
Clutch rod	Bobbin thread guide pipe	Gear cover (rear)
Clutch lever	Differential regulation lever	Swing guard
Cover for needle bar and roller	Window screw for stitch length adjustment	Upper feed roller assembly
Pressure regulating nut	Oil gauge (front)	Upper feed roller
Pressure regulating plate spring assembly	Oil discharge screw (front)	Needle clamp
Oil circulation inspection window (rear)	Cylinder side cover	Right and left guide plates
Thread tension knob	Gauge plate	Guide finger
Thread guide	Feed rocking lever eccentric pin	Roller pressure regulating spring
Oil circulation inspection window (front)	Looper cover	Roller pressure regulating screw
Looper push button	Throat plate	Needle thread lever-thread guide
Front top cover	Three folding device	Rocking balance thread guide
Rear top cover	Presser	Needle thread rocking balance
Needle thread guide path	Needle guard & needle cooling pipe	Needle thread support adjuster
Needle thread adjusting path	Needle bar	Needle thread small tensioner

– 7 –

6. How to pass the threads

(1) Differential feed

How to pass the needle threads and looper threads

1.Drawing of differential feed threading (sample model: 35800DNU & BWDN)

Needle thread: 1 for left needle thread, 2 for middle needle thread, 3 for right needle thread Looper: 4 for front looper, 5 for middle looper, 6 for rear looper

Follow the drawing below to pass the threads.

Tension section

[Model: 35800DNU]	1
	2	3

4	5
	6

Needle section

2 3 1

6 5 4

Looper section

Looper thread cam section

– 8 –

(2) 1 piece feed

How to pass the needle threads and looper threads

1.Drawing of 1 piece feed threading (sample model: 35800DRU & BWDR)

Needle thread: 1 for left needle thread, 2 for middle needle thread, 3 for right needle thread

Looper: 4 for front looper, 5 for middle looper, 6 for rear looper Follow the drawing below to pass the threads.

Tension section

[Model: 35800DRU]	1
	2	3
			4
			5

6

Needle section

3 1

6 5 4

Looper section

Looper thread cam section

– 9 –

7. Standard adjustment

(1)How to remove the gauge components and upper feed roller (differential feed mechanism and 1 piece feed mechanism)

Disassembly procedure

1.Remove the gauge, its related parts (needle , presser yoke , throat plate , differential feed dog , and main feed dog ), the cover, its related parts (cover for needle bar and roller and looper cover ),

upper feed roller assembly , roller pressure regulating screw , and pressure regulating plate spring assembly before adjustment.

(Caution) The directions of front, rear, right, and left during standard adjustment are based on the operator working position. Therefore, the forward rotation of the pulley is counterclockwise.

Left side of the machine head

Rear side of the machine head

Right side of the machine head	Pressure regulating plate spring	Left side of the machine head
	and its related parts

	Gauge and its related parts	Gauge and its related parts
		(1 piece feed mechanism)
	(Differential feed mechanism)

– 10 –

Disassembly procedure

Removal procedure of the gauge and upper feed roller

1.Loosen the setscrew and remove the needle bar and the roller cover together with the face cover and the packing, which are attached to the rear side.

2.Loosen the nut with a 3/8” spanner and remove the washer and clutch rod .

3.Remove the roller pressure regulating screw .

4.Loosen the setscrew securing the upper feed roller shaft with a 3/32" key wrench, remove the setscrew

securing the link, lift the upper feed roller shaft and the guide finger , and remove the upper feed roller assembly .

(Caution) When the upper feed roller shaft is lifted, the guide finger interferes with the lift lever crank . Therefore, remove the upper feed roller assembly after lifting the lift lever crank

slightly.

5.Loosen the pressure regulating nut and remove the pressure regulating plate spring assembly .

6.Loosen each setscrew that securing corresponding needles and remove three of each needle .

7.Loosen the setscrew securing the presser yoke with a 5/64" or 2mm key wrench and remove the presser yoke after lifting the presser shaft .

8.Loosen the setscrew with a 3/32" key wrench and remove the setscrew securing the cover. Removal of the setscrew allows you to remove the looper cover and spring stud .

9.Loosen three setscrews securing the throat plate and remove the throat plate .

10.Loosen the setscrew and remove the differential feed dog .

11.Loosen the setscrew and remove the main feed dog .

12.Loosen the setscrews securing the loopers and remove the loopers .

(Caution) The disassembly procedure mentioned above mainly describes about the differential feed mechanism.

As to the 1 piece feed mechanism, the differential feed dog and setscrew are not provided.

– 11 –

(2) Timing between the looper and needle bar

Standard Adjustment

1.Timing between the looper and needle bar (synchronization)

Gauging equipment is mounted to perform synchronization adjustment.

The reference state is that there is no clearance between the bottom surface of the lower needle bar bushing and the top surface of the timing gauge when the steel rod touches the throat plate by rotating

the pulley in the forward and backward directions. (Be sure to rotate the pulley in both directions to check the clearance.) The allowable clearance range is from 0 to 0.1 mm.

(Caution) The allowable clearance between the steel rod and the throat plate ranges from 0 to 0.1 mm when the bottom surface of the lower needle bar bushing touches the top surface of the timing gauge ahead of the other touch by rotating the pulley in both directions.

Right-left direction

Clearance at rotation in both directions: 0 to 0.1 mm

19mm

Touch between the steel rod and throad plate

Clockwise-counterclockwise direction

Match mark

– 12 –

		Adjustment Procedures			Results of Improper Adjustment
	1. How to install and use the synchronization adjustment gauge				o Improper synchronization position
	(1) Put the steel rod	in the front looper base	and tighten the		adjustment may cause stitch
	setscrew .
					skipping or thread breakage.
	(Caution) Use a key wrench (3 mm) instead of the steel rod			if
	necessary.

(2)Loosen the setscrew slightly and move the front looper base with the steel rod integrated to the most left position.

(3)Install the throat plate and tighten the setscrew .

(4)Rotate the pulley to move the steel rod to the most left position, set the clearance between the right surface of the steel rod and the

left surface of the throat plate to 19 mm, and tighten the setscrew securing the front looper base .

(5)Rotate the pulley counterclockwise and stop it when the steel rod

touches the left surface of the throat plate .

(6)Mount the timing gauge to the needle bar . Be sure to mount

the timing gauge so that the top surface of the timing gauge touches the bottom surface of the lower needle bar bushing .

(Caution) Use a clip instead of the timing gauge if necessary.

(7)When the pulley is rotated clockwise, the steel rod moves from side to side.

Touch the steel rod with the left surface of the throat plate again.At

this moment, make sure that the clearance between the bottom surface of the lower needle bar bushing and the top surface of the timing gauge is within the allowable range.

(Caution) The bottom surface of the lower needle bar bushing may touch the top surface of the timing gauge ahead of the other touch. In such a case, make sure that the clearance between the steel rod and the throat plate

is within the allowable range.

(8)If the timing between the looper (steel rod ) and the needle bar is inappropriate, follow the procedure below.

2. Corrective points and corrective measures

(1)For adjusting the timing between the looper (steel rod ) and the needle bar , loosen 9 setscrews securing the rear top cover and remove the rear top cover and the packing.

(2)Loosen 3 fixing nuts securing the front and rear main shaft couplings ( and ) and engage a key wrench (3/32") with the setscrew to move the front main shaft coupling in the clockwisecounterclockwise direction for adjustment while keeping the rear

main shaft coupling unmoved. (For the fixing nut , use a 1/4" spanner.)

(Caution) 1. Align the match marks.

2.For moving the front main shaft coupling , temporarily tighten one of the fixing nuts , which is close to the match mark, and make an adjustment.

oTo increase the clearance between the steel rod and throat plate

, rotate the front main shaft coupling clockwise.

o To decrease the clearance between the steel rod and throat plate , rotate the front main shaft coupling counterclockwise.

(3)After adjustment, put the rear top cover and packing back on and tighten the setscrew .

– 13 –

(3) Adjustment of the needle entry positions in the right-left and front-rear directions

Standard Adjustment

1.Needle entry

1)Needle entry position in the right-left direction

Mount 3 needles to the needle clamp . The standard needle entry position "A" in the right-left direction is the center of the needle hole of the throat plate .

2)Needle entry position in the front-rear direction

The standard needle entry position in the front-rear direction is decided under the condition that the clearance between the needle and needle hole of the throat plate , "B", is the same for all of 3

positions.

(Caution) Adjust the needle entry position in accordance with the temporary needle bar height of 12.5 mm.

Refer to "(5) Adjustment of the needle bar height".

Front-rear

direction

Right-left direction

Clockwise-counterclockwise direction

Hole at the top of the needle bar

B

Same in 3 needles

A

Center

Clockwise-counterclockwise direction

– 14 –

	Adjustment Procedures		Results of Improper Adjustment
1. Checking procedure of needle entry			o Improper needle entry position
(1)	Mount 3 needles to the needle clamp	and tighten the setscrew	adjustment may cause stitch
	.		skipping, needle breakage, or
(2)	Loosen the needle bar holding screw	, set the temporary needle	thread breakage.
	bar height (12.5 mm), and tighten the needle bar holding screw
	{6} temporarily (approximately 4 turns of the needle bar ).

(3)Insert the torque rod into the hole at the top of the needle bar and rotate the needle bar in the right-left direction to adjust the

needle entry position in the front-rear and right-left directions.

(Caution) 1. When the needle position is not in the center of the needle hole of the throat plate in the right-left direction, follow the procedure below.

2.For needle entry adjustment, mount the rear needle guides temporarily and make sure that 3 needles touch evenly.

2.Needle entry adjustment

(1)For adjusting the needle entry position in the right-left direction,

remove 6 setscrews securing the front top cover to remove the front top cover and packing .

(2)Loosen the hexagon head bolt , engage a driver with the eccentric pin , and rotate the driver in the right-left direction. Then, the sylinder arm moves in the right-left direction.

(3)Adjust the needle entry position in the right-left direction.

oRotation of the eccentric pin clockwise moves the cylinder arm leftward.

oRotation of the eccentric pin counterclockwise moves the cylinder arm rightward.

(4)After adjustments, tighten the hexagon head bolt .

(5)After adjusting the needle entry position, put the front top cover and packing back on and tighten the setscrew .

– 15 –