Union Special 36200 Manual

®

Feed-off-the-arm, 4-needle “Flatseamer” for Top and Bottom Coverstitch

36200 Series Minute-quantity

lubrication

ENGINEER’S MANUAL

40040898

No.E373-00

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.

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			CONTENTS
1.	Specifications ........................................................................................................			1
2.	List of models ........................................................................................................			2
3.	Model numbering system ............................................................................			3
4.	Configuration.................................................................................................			4
	(1) Head names ..............................................................................................................................			4
	(2)	Names of presser body ...........................................................................................................		5
5.	Needles .........................................................................................................			6
	(1)	Needle types .............................................................................................................................		6
	(2)	Features of needles .................................................................................................................		6
	(3)	Needle applications .................................................................................................................		6
6. How to conduct threading ...........................................................................				7
7. Standard adjustment ..............................................................................................				8
	(1)	Presser removal work ......................................................................................................		8
	(2)	Adjusting the height of the needle bar .........................................................................		10
	(3)	Adjustment of needle array ...........................................................................................		12
	(4)	Right and left needle entry position adjustments .......................................................		14
	(5)	Looper adjustment .........................................................................................................		16
		1)	Returning amount of the looper .........................................................................................................	16
		2)	Adjustment of a clearance between looper and needle .....................................................................	16
	(6)	Adjustment of looper and needle bar timing .....................................................................		18
	(7)	Adjustment of looper movement.........................................................................................		20
	(8)	Adjustment of looper movement locus ..............................................................................		22
	(9)	Adjustment of the feed dog .................................................................................................		24
	(10) Adjustment of needle holder ...............................................................................................			26
		1)	Adjustment of rear needle holder .......................................................................................................	26
		2)	Adjustment of forward movement needle holder ...............................................................................	26
	(11) Adjustment of feed mechanisms ........................................................................................			28
		1)	Stitch length adjustment ....................................................................................................................	28
		2)	Adjustment of differential feed amount ..............................................................................................	28
	(12) Adjustment of presser main body mounting .....................................................................			30
	(13) Adjustment of the presser main body proper ....................................................................			32
		1)	Adjustment of presser lifter connecting lever .....................................................................................	32
		2)	Adjustment of presser lifting strap plunger ........................................................................................	32
		3)	Adjustment of minute presser lifting ...................................................................................................	32
	(14) Adjustment of top fancy looper and fancy thread carrier .................................................			34
		1)	Stroke position adjustment of drive sleeve ........................................................................................	34
		2)	Amount of fancy thread carrier injection ............................................................................................	34
		3)	Leftmost point of top fancy looper ......................................................................................................	36
		4)	Clearance developed at the time of crossing between the fancy thread carrier and
			the tip of the top fancy looper ............................................................................................................	36
		5)	Rightmost point of top fancy looper ...................................................................................................	36
		6)	Height of top fancy looper ..................................................................................................................	36
	(15) Adjustment of top fancy cam and bobbin thread cam ......................................................			38
		1)	Adjustment of top fancy cam .............................................................................................................	38
		2)	Adjustment of bobbin thread cam ......................................................................................................	38

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(16)	Knife adjustment ..................................................................................................................		40
	1)	Lower knife adjustment ......................................................................................................................	40
	2)	Upper knife adjustment ......................................................................................................................	40
	3)	Pressure adjustment of upper knife ...................................................................................................	40
(17) Adjustment of upper knife drive lever ................................................................................			42
(18)	Adjustment of needle thread path ......................................................................................		44
	1)	Adjustment of needle thread guide bar ..............................................................................................	44
	2)	Adjustment of needle holder adjusting pin .........................................................................................	44
	3)	Adjustment of needle thread presser spring ......................................................................................	44
(19)	Adjustment of tension disk rise and protection cover .....................................................		46
	1)	Adjustment of tension disk rise ..........................................................................................................	46
	2)	Adjustment of protection cover ..........................................................................................................	46
(20)	Adjustment of lapformer ......................................................................................................		48

8. Lubrication ...........................................................................................................		50
9. List of rear spring ................................................................................................		51
(1)	One side trim .........................................................................................................................	51
(2)	Both side trim ........................................................................................................................	52
(3)	Taping ....................................................................................................................................	53
(4)	Step gauge ............................................................................................................................	53
(5)	Butted seam ..........................................................................................................................	53
10. Types of feed dogs ..............................................................................................		54
11. Maintenance .........................................................................................................		55
(1) Spare parts .............................................................................................................................		55
12. Troubles and corrective measures ............................................................		56
13. Table drawing ..............................................................................................		68
(1)	Auxiliary drive table ..............................................................................................................	68
(2)	Auxiliary drive sub-table ......................................................................................................	69

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1. Specifications

	No.	Model name				Application
		Item	36200L/36200U			36200T		36200L220
	1	Application	General light-weight -			Intended for taping		For light-weight (swimsuits)
			medium-weight materials					materials
	2	Sewing type	4-needle both side trim			4-needle one side trim		5-needle both side trim
			fancy sewing			fancy sewing		fancy sewing
	3	Max. sewing speed (normal)	4,200rpm (normal sewing speed: 3,200rpm)					4,200rpm (normal: 2,500rpm)
	4	Stitch length	1.6 to 2.5mm (Standard 2.1mm)					1.6 to 1.8mm (standard 1.6mm)
	5	Needle gauge	5.2mm, 6.0mm					6.0mm
	6	Needle bar stroke				30mm
	7	Needles to be used	UY118GKS065 to 080 (#9 to #12)					UY116GKS065
		(Standard needle count)	* (Standard 70/ #10)			(Standard 80/ #12)		(Standard 65/ #9)
	8	Retainer needles to be used	36211-060 to 075
		(Standard needle count)	* (Standard 65/ #9)			(Standard 75/ #11)
	9	No. of threads used	6 pcs.			5 pcs.		7 pcs.
	10	Feed control system	Main feed ----- Slide type stitch pitch control system
			Differential feed ------------ Lever control system
	11	Lubrication	Rotary pump type auto lubrication (minute-quantity lubrication to needle bar and looper sections)
	12	Quantity of oil storage	Front oil storage: 70ml to 80ml
			Rear oil storage: 60ml to 70ml
	13	Lubricating oil	Union Special Specification 175 (equivalent to ISO VG22) or
						JUKI Oil SUP2000 – 1L
	14	Installation system	Table and Aux. Drive mounting system
						Pedestal mounting system
	15	Lifting amount of presser	One side trim type 8.0mm, both side trim type 6.0mm
	16	Minute presser lifting				Provided as standard
	17	Needle thread silicone tank				Provided as standard
	18	External dimensions	Height 31.5mm x Width 25.5mm x Depth 42.5mm
	19	Weight of head				22kg
	20	Working temperature/humidity	Temperature : 5°C to			35°C, Humidity : 35% to 85% (no condensation)
	21	Supply voltage/frequency	Rated voltage ±10% 50 / 60Hz

*For standard usage in Japan, the needle count is [Standard 65/#9]. The needle count for retainer needles is [Standard 60/ #8].

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2. List of models

The standard models are the lapseamers with 4 needles and 6 threads for vertical fancy stitch.

According to the model names, they are classified into specifications for the specific gauges, step gauges, taping, and multi-purpose.

	Model name	Application	Number of	Retainer	Number of	Top fancy	Knife	Lapformer
			needle	needle	threads
		General knit goods
	36200L100-52		4	1	6	With	One side trim	Without
		Lightand medium-weight
		materials
	36200L100-60	General knit goods	4	1	6	With	One side trim	Without
		General knit goods
	36200L200-52		4	1	6	With	Both side trim	With
		Lightand medium-weight
		materials
		General knit goods
				1
	36200L200-60	Lightand medium-weight	4		6	With	Both side trim	With
		materials
		Swimsuits		0
		Specific gauges
		(Thigh patch-up for
	36200L202-52	boxer's briefs, etc.)	4	1	6	With	Both side trim	With
		Medium-weight materials
		Specific gauges
		(Thigh patch-up for
	36200L202-60	boxer's briefs, etc.)	4	1	6	With	Both side trim	With
		Medium-weight materials
		1.27mm step gauges
	36200L210-52		4	1	6	With	Both side trim	With
		Mediumand heavy-
		weight materials
		1.27mm step gauges
	36200L210-60		4	1	6	With	Both side trim	With
		Mediumand heavy-
		weight materials
	36200T300-52	Fly taping	4	1	5	Without	One side trim	Without
	36200T300-60	Fly taping	4	1	5	Without	One side trim	Without
		Multi-purpose
	36200U300-52		4	1	6	With	Combined use	Combined use
		Lightand medium-weight
		materials
		Multi-purpose
	36200U300-60		4	1	6	With	Combined use	Combined use
		Lightand medium-weight
		materials

(Caution) The list shows the models exclusive for 4 needles. It does not include the models for 5 needles.

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3. Model numbering system

Name: Feed-off-the-arm 4-needle “Flatseamer” for Top and Bottom Coverstitch

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

3

6

2

0

0

— A A

6 to 9

Head specifications

Code

Specifications

Cloth cutting

Applications

L100

Lapseam

One side trim

With edge guide spreader

L200

Lapseam

Both side trim

With lapformer spreader

L202

Lapseam

Both side trim

Specific both side trim gauge lapformer

With spreader

L210

Lapseam

Both side trim

Both side trim 1.27mm, step presser, throat plate, feed dog

With lapformer spreader

L220

Lapseam

Both side trim

Specific 5-needle presser, lapformer

With spreader (for swimsuits)

T300

Taping

Combined use for one side

Without spreader, tape reel

and both side trim

With tape folder

U300

Multi-purpose

Combined use for one side

Multi-purpose specifications

and both side trim

10 to 11

Needle gauge

52

5.2mm

60

6.0mm

* Head spec. L220 applicable to 60 (6.0mm) only

12

Region

J

Japan

N

North America, Europe

S

Asia

*Head spec. L100 only, Impossible to select J J (for Japan) of L100 covered by S

14	Place pf destonation
A	Standard
15	Accessories type
A	Standard

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4. Configuration

(1) Head names

Presser pressure stroke adjusting screw						Frame needle thread path	Looper cover
Needle bar guard						Needle thread guide bar	Presser
Rear top cover						Thread path frame	Face cover
Lift lever						Looper thread guide	Minute presser lifting
Oil circulator check window (rear)						Stitch length control window screw	Swing guard
Oil gauge (rear)						Oil gauge (front)	Protection cover
Needle thread silicone unit						Oil drain screw (front)	Lapformer
Thread tension knob						Cylinder side cover	Oil drain screw (rear)
Thread guide						Differential adjusting lever	Pulley
Oil circulator check window (front)						Scale plate feed	Needle thread rocking guide
Threading guard (Assy)						Feed dog eccentric pin	Needle thread holder adjusting pin
							Front top cover

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(2) Names of presser body

Presser bar

Fancy thread carrier

Drive lever link

Drive link

Top fancy looper

Drive sleeve

Link pin

Lower knife clamp setscrew

Minor presser (Minor presser

Link pin setscrew

Lower knife clamp

for stepped materials)

Drive lever shaft (carrier)

Rear spring, left

Rear spring, right

Rear spring setscrew

Lower knife

Fancy thread carrier setscrew

Rear spring hanger wire

Thread chips guard setscrew

Fancy looper setscrew

Spring

Presser main body

Thread chips guard

Drive lever shaft (looper)

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5. Needles

(1) Needle types

UNION standard accessory needle GROZ-BECKERT/UY118GKS

070/#10

No.

Needle symbol

Thread groove

Scoop

Strength

Thread available for sewing

1

UY118GKS

Presence of front

With

Weak

Spun thread, wooly thread,

and rea

Tetoron thread, cotton thread

2

UY118GAS

Presence of front

Without

Strong

Spun thread

and rear

3

UY118GBS

Front only

With

Weak

Wooly thread

4

36211

(2) Features of needles

No.

Features

The front and rear sides of a needle have thread grooves. It is somewhat more difficult to obtain an

1

adequate tension for the needle thread, compared with the 118GAS.

Since there is a scoop behind the needle, the effect of prevention against stitch skipping can be

expected even for a thread that is inefficient in making loops.

There are thread grooves provided to both the front and rear sides of a needle. The needle thread

tension tends to be increased.

2

Since no scoop is provided to rear side of the needle, needle bend is minimum at the time of

needle entry into the materials. This type of needle is suitable for the products of heavy-weight

materials or those that involve thick sections in materials. (General knit goods, etc.)

Since no scoop is provided, it is not suitable for applications to wooly or Tetoron threads.

Since no thread grooves are provided to the rear side of a needle, the needle thread tension tends to

3

be decreased. Since there is no thread groove and a scoop is provided to the rear side of the needle,

the needle thread can produce loops easily and therefore this type of needle is suitable for applica-

tions to wooly threads or the like.

4

If a retainer needle (sacrifice needle) is used, softer switches can be obtained.

(3) Needle applications

No.

Applications

1

Used for the products of knit goods and swimsuits.

2

Used for general knit products.

3

Used for ladies’ shorts, girdles, etc., made of stretchy textiles.

4

Used for general products of knit products.

(Caution) Standard needles used in Japan are of UY118GKS•GAS, 065 (#9).

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6. How to conduct threading

How to make threading for the needle threads and the top and bottom fancy threads

Threading illustration and threading guard setup

1.When you want to use the flatseamer machine head, you have to mount the threading guard (Assy) . It can be mounted by means of two setscrews (2 pcs.).

2.1 to 4 correspond to the needle thread, 5 to the top fancy thread, and 6 to the bottom fancy thread. Make threading according to the threading illustration.

4

3

2

1

4

3

2

1 5

6

5

1	4	5
	2 3

5 6

6

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7. Standard adjustment

(1) Presser removal work

		Procedures of assembling
1.	To make the standard adjustments of the flatseamer, remove the presser main body		first of all.
	Main body assembly diagram	State of the presser removed
	Rear side of the presser main body	State of the face cover removed

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Procedures of assembling

Disassembly procedures for the presser main body

1.Loosen the setscrews (4 pcs.) and take out the face cover .

2.Open the protection cover and take out the needles (5 pcs.) with the needle bars positioned at the upper dead point.

3.Loosen the upper knife fixing screw (key wrench of 3/8) and remove the upper knife .

4.Loosen the setscrews (2 pcs.) and take out the upper knife fixing block and the upper knife auxiliary plate .

5.Loosen the presser bar setscrew .

6.Loosen the presser guide left setscrews (key wrench of 5/32) (2 pcs.) and remove the presser guide left setscrews on the operator side. Make the presser guide left free.

7.Remove the presser pressure adjusting screw and the pressing screw.

8.Loosen the presser bar guide setscrew and remove the presser bar guide and the presser bar while the presser bar is pulled out upwards.

9.Remove the presser main body .

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(2) Adjusting the height of the needle bar

Standard Adjustment

oFor a needle gauge of 5.2mm

Mount the right needle on the needle clamp with the needle bar positioned at the upper dead point and put the needle bar height gauge on the upper face of the throat plate . Check this condition in the position of 531. The standard needle bar height is 13.5mm.

Use the needle bar height gauge (21227BU).

oFor a needle gauge of 6.0mm

Mount the right needle on the needle clamp with the needle bar positioned at the upper dead point and put the needle bar height gauge on the upper face of the throat plate . Check this condition in the position of 500. The standard needle bar height is 12.7mm.

Use the needle bar height gauge (21227DS).

Needle gauge : 5.2mm

Needle gauge : 6.0mm

13.5mm

12.7mm

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	Adjustment Procedures			Results of Improper Adjustment
1. Remove the face cover and loosen the needle bar connecting bracket				When the needle bar height is
setscrew to adjust the needle bar height by the means of the needle				greatly different
bar height gauge	or .			o This will be a cause of stitch skip-
(Caution) When checking the needle bar height, change the needles				ping, needle breakage, or thread
and	, enter the needles	and	in the needle	breakage.
clamps	and to their uppermost ends, and stop them
in the correct positions. The needle shank has a flat sec-
tion. Stop the needle with the flat section positioned in
front.

2. After the adjustment of the needle bar height, adjustment of the needle array is carried out subsequently. Temporarily fasten the setscrew of the needle bar connecting bracket .

(Caution) 1. When the needle bar connecting bracket setscrew

is fastened temporarily, the needle bar is required not to come down even when it is rotated.

2.If the needle bar height is changed for a certain rea-

son, readjustment is needed from the beginning, using the needle bar height gauge or .

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(3) Adjustment of needle array

Standard Adjustment

1.Needle array

Use the left needle and the retainer needle , and check the needle array based on Line A of the upper knife .

Apply Line A of the upper knife to the left needle and the retainer needle on both sides. In this state, the standard angle is that Line B of the upper knife is observed in parallel to Line C of the throat plate groove.

A line

B line

C line

Right and left revolving

,

	B line
A line	C line

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	Adjustment Procedures				Results of Improper Adjustment
Method of needle array check					When the needle parallelism is not
1.	Checks on the needle array parallelism are carried out after the				secured
	completion of needle bar height adjustments.				o This will be a cause of stitch skip-
2.	When checking the needle array parallelism, the needle bar			is	ping, needle breakage, thread
	lowered to the midpoint under the condition that no looper is attached.				breakage, or destruction of throat
3.	Make Line A of the upper knife	come in contact with the left needle			plate claws.
	and the retainer needle	on both sides. In this state, check the
	parallelism between Line B of the upper knife		and Line C of the
	throat plate groove.

4.If no parallelism is secured, insert a spanner (7mm/9/32) in the needle

clamp and try to secure the needle array parallelism by turning the needle bar to the right and left.

(Caution) If checking is intended without the dislodgment of the looper, do it in the position where the left needle and the retainer needle do not come in contact with the rear side of the looper.

5.After the confirmation of parallelism, check the needle bar height again and fix the needle bar connecting bracket setscrew .

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(4) Right and left needle entry position adjustments

Standard Adjustment

1.Needle entry

Attach the needles (4 pcs.) and the retainer needle , and check the right and left needle entry spaces in regard to the throat plate claws .

Examine the position where the left space becomes wider by 0.15mm than the right space. In this state, the

standard position is that the needles (4 pcs.) and the retainer needle (1 pc.), five needles in all, do not touch the right and left throat plate claws .

Left space wider by	Right space
0.15mm

Left middle needle

regarded as the basis

Throat plate

Right and left revolving directions

Left direction

Right direction

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	Adjustment Procedures			Results of Improper Adjustment
Needle entry adjusting positions				When the needle parallelism is not
1.	When adjusting the right and left needle entry, remove the front top			secured
	cover and the oil receiver.			o This will be a cause of stitch skip-
2.	Loosen the collar setscrew	and move the collar	toward the	ping, needle breakage, thread
	front.			breakage, or destruction of throat
3.	Loosen the hexagon coupling bolt and insert a screwdriver in the			plate claws	as a result of get-
	eccentric pin . When the screwdriver is turned to the right and left,			ting flaws.
	the cylinder arm moves to the right and left.

4.Confirm the result of needle entry position adjustments.

5.After adjustments, tighten the hexagon coupling bolt to return the

collar	to its initial position. Since then, tighten the collar setscrew
.

Method of confirmation

o Turning the eccentric pin to the right causes the cylinder arm to move to the left.

oTurning the eccentric pin to the left causes the cylinder arm to move to the right.

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(5) Looper adjustment

Standard Adjustment

1) Returning amount of the looper

When the looper is positioned at the leftmost point, adjust the distance to 4mm from the tip of the looper to the center of the left needle .

The amount of standard looper return is 4mm. However, the amount of return of the looper may somewhat change according to the type of thread.

The final amount of return of the looper should be determined by making fine adjustments of the amount of looper return while making threading and observing the stitches of trial sewing.

4mm shall be regarded as the amount of return of the looper during adjustments.

Right and left directions

Tip

Center

4mm (5/32)

Right and left directions	Forward and back-
	ward directions

2)Adjustment of a clearance between looper and needle

The standard clearance is 0.0mm (light contact) when the tip of the looper reaches the center of the left needle .

After rear needle holder adjustments, check the clearance again between the looper and the left needle . For the final adjustment, this check should be carried out after making threading.

(Caution) 1. If no rear needle holder is provided, the above-mentioned checks should be carried out in the state that the tip of the looper slightly touches the left needle .

2.The needles to be used come in two types; with a scoop (118GKS) and without a scoop (118GAS).

Clearance between the looper and the left needle

0.0mm

(Light contact)

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		Adjustment Procedures				Results of Improper Adjustment
1) Returning amount of the looper						When the amount of looper return,
1.	Mount the looper	on the looper base		and fasten it with the		changing with the type of thread, is
	setscrew .					too much
2.	Loosen the looper base setscrew		and move the looper base		to	o Tightness of stitches becomes
	the right or left for adjustments.					worse for the left needle thread
3.	After adjustments, tighten the looper base setscrew .					and the stitches of thread tension
(Caution) When making adjustments by moving the looper base						are degraded.
	to the right or left, the forward and backward posi-					When the amount of return is small
	tioning of the looper base		is also changed.			o This can be a cause of stitch skip-
	During the right-left adjustment of the looper base				,	ping when the looper	is re-
	make adjustments of "7.-(5)-2), Adjustment of clearance					treated.
	between looper and needle" simultaneously by means					o The needle thread, second from
	of the setscrew .					the right needle, is delayed from
						the looper and it comes out si-
						multaneously with the right needle
						thread. Thus, the stitches of thread
						tension are degraded.
						o This is a cause of second stitch
						skipping as seen from the left
						needle .

2) Adjustment of a clearance between looper and needle

1.Loosen the looper base setscrew and turn the setscrew to adjust the looper base by moving it forward and backward.

2.After adjustments, tighten the looper base setscrew .

o When the looper base is moved to the left, the tip of the looper is separated from the left needle .

o When the looper base is moved to the right, the tip of the looper

comes in contact with the left needle .

(Caution) After the completion of adjustments in accordance with "7.-(6) Adjustment of looper and needle bar timing" and "7.-(7), 7.-(8) Adjustment of looper movement and motion locus", make readjustments, without fail, according to "2) Adjustment of a clearance between looper and needle".

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(6) Adjustment of looper and needle bar timing

Standard Adjustment

1.Looper and needle bar timing (synchronization)

Synchronization is adjusted after mounting the respective gauge parts. Turn the pulley in the forward direction and adjust the tip of the synchro-gauge rod to the graduation after the needle bar has been stopped. The standard position is defined when the pulley is turned in the reverse direction and the tip of the synchro-gauge rod stops at the same graduation for forward pulley rotation after the needle bar has been stopped.

(Caution) When the pulley is turned in the forward/reverse direction, the standard value is defined if the obtained figure is different by less than 1 from the graduation of the tip of the synchrogauge rod .

Tip of the synchro-	Forward movement
gauge rod

Graduation

Reverse movement

US gauge Part No. 21227CG

Thickness:

4mm

(Caution) Installation of the gauge indicated in the above drawing falls on the new 36200L type. In regard to the installation of the gauge for the former type 36200, installation of the needle bar

torque tool is not required.

Right and left revolving directions

Forward and backward directions

(Caution) The main shaft coupling front and rear, and , are provided with the fitting mark . Gauge check should be carried out after making adjustments to the fitting mark .

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	Adjustment Procedures			Results of Improper Adjustment
How to mount and use the synchro-adjust gauge				o Incorrect synchro-gauge position-
1.	Attach the needle bar torque tool to top of the needle bar and			ing may cause stitch skipping.
	tighten the setscrew	. Then, move the needle bar	to the lower
	dead point.
2.	Mount the gauge base	on the presser pressure adjusting spring
	and fix the needle bar height adjusting screw		just above the
	needle bar .

3.Insert the 4mm-thick portion of the synchro-gauge base in between the needle bar and the needle bar height adjusting screw

. Turn the needle bar height adjusting screw until it comes in contact with the synchro-gauge base . In the state that a dimension (thickness) of 4mm is maintained, tighten and fix the needle bar height adjusting nut .

4.Remove the synchro-gauge base and mount it on the looper . Tighten the setscrew . When the pulley is turned in forward direction, the needle bar rises by 4mm and stops there. At this time, adjust the tip of the synchro-gauge rod to the specified graduation position. (Within the scale range)

5.When the pulley is turned in reverse direction, the needle bar rises, lowers, and stops. Confirm the graduation position of the tip of the synchro-gauge rod . If there is any deviation by more than 1 from the graduation position in forward revolution, adjust the main shaft coupling front and rear, and , respectively.

Adjusting positions and method of adjustment

To make timing adjustments for the looper and the needle bar , remove the rear top cover and loosen three nuts of the main shaft coupling front and rear, and , respectively. In the state that the main shaft coupling rear is held, move the main shaft coupling front to the right and left to adjust it.

(Spanner 1/4 inches for the nut )

oTurning the main shaft coupling front to the right causes the tip of the synchro-gauge rod to go backward.

o Turning the main shaft coupling front to the left causes the tip of the synchro-gauge rod to go forward.

(Caution) To move the main shaft coupling front , temporarily fasten a nut that is located near the fitting mark during adjustment. If the nut is not fastened temporarily, position of the tip of the synchro-gauge rod cannot be made stable.

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From the library of Superior Sewing Machine & Supply LLC - www.supsew.com