JUKI MF-7900-E11 User manual

INSTRUCTION MANUAL

MF-7900-E11

CONTENTS

1. SPECIFICATIONS........................................................................................................................ 1

2. ADJUSTMENT PROCEDURE OF ENGAGEMENT AMOUNT OF KNIVES ............................... 1

3. ADJUSTMENT PROCEDURE OF THE KNIFE PRESSURE ...................................................... 2

4. ADJUSTMENT PROCEDURE OF KNIFE CUTTING POSITION ................................................ 2

5. ADJUSTING THE ENGAGEMENT ANGLE OF THE KNIFE....................................................... 3

6. REPLACEMENT PROCEDURE OF MOVING KNIFE AND FIXED KNIFE................................. 4

7. ADJUSTMENT PROCEDURE OF CLOTH GUIDE ..................................................................... 4

8. ADJUSTMENT PROCEDURE OF FRONT-UP AMOUNT OF THE PRESSER FOOT................ 5

9. ADJUSTMENT PROCEDURE OF THE POSITION OF THE TAPE GUIDE................................ 5

10. INSTALLING THE ACCESSORIES (TAPE GUIDE BASE, TENTION ROLLER AND SUCTION

PIPE) SUPPLIED WITH THE MACHINE ..................................................................................... 6

11. ADJUSTING PROCEDURE OF THE POSITION OF THE TENSION ROLLER.......................... 8

12. ADJUSTING PROCEDURE OF THE POSITION OF THE TAPE GUIDE BASE....................... 10

13. HOW TO USE THE KNIFE CANCELLING MECHANISM......................................................... 14

14. DRAWING OF TABLE ............................................................................................................... 15

– 1 –

1. SPECIFICATIONS

When adjusting the engagement, perform the work after

conrming regarding the height of xed knife ❸that the

upper surface of the fixed knife is flush with the upper

surface of the throat plate or the former is installed slightly

lower than the latter.

Loosen setscrew ❶in the state that moving knife ❷comes

down to its lowest position, and adjust the engagement

amount of the moving knife and xed knife ❸ to approximate-

ly 0.5 mm.

2. ADJUSTMENT PROCEDURE OF ENGAGEMENT AMOUNT OF KNIVES

Model MF-7900-E11

Class name Right-hand fabric undertrimmer for pre-closed elastic attaching with tension roller

Application Pre-closed waist elastic attaching of men's brief, trunks, etc.

(Waist elastic width up to 40 mm)

Sewing speed

Max. 5,000 sti/min

(provided with PL12 or PL13)(at the time of intermittent operation)

Speed of stitch at the delivery. 4,000 sti/min(provided with PL12 or PL13)

(at the time of intermittent operation)

Needle gauge

3-needle 5.6 mm, 6.4 mm

2-needle 4.0 mm

Feed ratio 1 : 0.7 to 1 : 1 (Pitch less than 2.5 mm)

Stitch length 0.9 to 3.6 mm (Adjustable up to 4.5 mm)

Noise

- Equivalent continuous emission sound pressure level (LpA) at the workstation:

A-weighted value of 78.5 dB; (Includes KpA = 2.5 dB);

according to ISO 10821- C.6.2 -ISO 11204 GR2 at 4,000 sti/min.

❶

❸

0.5 mm

❸ ❷

WARNING :

To protect against possible personal injury due to abrupt start of the machine, be sure to start the follow-

ing work after turning the power off and ascertaining that the motor is at rest.

– 2 –

Adjust the distance between the right needle and the cut-

ting position as described below.

1) Loosen setscrews ❶, ❷, and ❸, and move moving

knife and xed knife to the right and left to adjust the

distance.(The knife will not move unless setscrews ❶

and ❷ are loosened.)

2) After the adjustment, tighten setscrew ❷and setscrew

❶ in the written order.

After the adjustment, the knife pressure changes. Adjust

the knife pressure appropriately referring to "3. ADJUST-

MENT PROCEDURE OF THE KNIFE PRESSURE"p.2.

4. ADJUSTMENT PROCEDURE OF KNIFE CUTTING POSITION

❷

❸

❶

Make the engagement pressure of moving knife and xed

knife as low as possible within the range of smooth cutting

of fabric. Loosen setscrew

❶

of striker Aand setscrew

❷

of striker B in the written order. Shift striker B to the right

and tighten setscrew

❷

to increase the knife pressure.

Once the desired knife pressure is achieved, tighten set-

screw

❶

3. ADJUSTMENT PROCEDURE OF THE KNIFE PRESSURE

❷❶

WARNING :

To protect against possible personal injury due to abrupt start of the machine, be sure to start the follow-

ing work after turning the power off and ascertaining that the motor is at rest.

WARNING :

To protect against possible personal injury due to abrupt start of the machine, be sure to start the follow-

ing work after turning the power off and ascertaining that the motor is at rest.

– 3 –

1）

Loosen setscrew ❶ of the adjusting lever. Adjust the

sharpness of the knife by turning the adjusting lever

counterclockwise according to the sharpness of the

knife.

2）

After the adjustment of the knife sharpness, tighten set-

screw ❶ of the adjusting lever.

3）

After the adjustment of the engagement, carry out "3.

ADJUSTING THE UPPER KNIFE PRESSURE" p.2

and "2. ADJUSTMENT PROCEDURE OF ENGAGE-

MENT AMOUNT OF KNIVES" p.1.

4）

In the delivered state of the sewing machine, the posi-

tion of marker dot A orients to the 12 o'clock direction,

as observed from the pulley side, when the knife is in

its lower dead point. Adjust to decrease the angle of

mesh bit by bit such as from 12 o'clock to 11 o'clock,

then to 10 o'clock.

　　1. The extent of the adjustment of the angle of

mesh is until marker dot A is turned coun-

terclockwise to reach the horizontal posi-

tion. If the lever is turned beyond the above,

the angle between the upper knife and the

lower knife will increase.

　　2. If the depth of engagement is excessively

increased, the knife can wear.

　　3. Adjust the knife so that it cuts well and the

depth of engagement is not excessive

Counterclockwise turn

❶

Marker dot A

B: Standard adjustment angle

Angle adjusted for hard-to-sew materials

Angle adjusted when the knife has worn

* If the knife engagement angle is adjusted to

D from the start, the knife can wear earlier

than the case where the angle is adjusted

the standard one.

Horizontal

position

Marker dot A

5. ADJUSTING THE ENGAGEMENT ANGLE OF THE KNIFE

WARNING :

To protect against possible personal injury due to abrupt start of the machine, be sure to start the follow-

ing work after turning the power off and ascertaining that the motor is at rest.

– 4 –

Remove setscrew ❸ and remove the old moving knife.

Press arrow mark plane Aof new moving knife ❶to the ma-

chined plane of knife holder ❷, and tighten it with setscrew

❸.

When replacing fixed knife ❺, loosen setscrew ❹, and

remove the xed knife in the lower direction. Insert the new

xed knife from the lower direction and x it. At this time, x

the xed knife with setscrew ❹ after conrming regarding

the height of xed knife that the upper surface is ush with

the throat plate or slightly lower than the throat plate.

When knife holder ❷is removed, perform the adjustment

of engagement again.

6. REPLACEMENT PROCEDURE OF MOVING KNIFE AND FIXED KNIFE

Adjust the position of cloth guide ❶in accordance with

the kinds and thickness of the fabric so that the hook knife

can cut the material end at a xed width. Loosen setscrew

❷, and move the cloth guide to the right and left to adjust

the position.

7. ADJUSTMENT PROCEDURE OF CLOTH GUIDE

❶

❷

❸

❹

❺

❶

❷

WARNING :

To protect against possible personal injury due to abrupt start of the machine, be sure to start the follow-

ing work after turning the power off and ascertaining that the motor is at rest.

WARNING :

To protect against possible personal injury due to abrupt start of the machine, be sure to start the follow-

ing work after turning the power off and ascertaining that the motor is at rest.

– 5 –

❷

❸

❶

8. ADJUSTMENT PROCEDURE OF FRONT-UP AMOUNT OF THE PRESSER FOOT

When sewing a thick rubber sheet or the like together, fab-

ric can be smoothly fed by raising the front of presser foot

❶. Loosen nut ❷, turn setscrew ❸ to the right (clockwise),

and raise the front of presser foot for adjustment.

9. ADJUSTMENT PROCEDURE OF THE POSITION OF THE TAPE GUIDE

Loosen setscrew ❶, and move tape guide base ❷to the

right and left to adjust the position of the tape.

❷

❶

WARNING :

To protect against possible personal injury due to abrupt start of the machine, be sure to start the follow-

ing work after turning the power off and ascertaining that the motor is at rest.

WARNING :

To protect against possible personal injury due to abrupt start of the machine, be sure to start the follow-

ing work after turning the power off and ascertaining that the motor is at rest.

– 6 –

10. INSTALLING THE ACCESSORIES (TAPE GUIDE BASE, TENTION ROLLER AND

SUCTION PIPE) SUPPLIED WITH THE MACHINE

(1) Installing the guide roller

(2) Installing the bottom roller of the tension roller

1) Adjust presser guide asm. ❸ to the installing hole, and

x it with screws ❶and ❷.

1) Install bottom roller plate ❶with three wood screws ❷.

For the installing position of the bottom roll-

er plate, refer to the drawing of the table.

Fix front roller general asm.

❶

with setscrew

❷

(3) Installing the front roller

WARNING :

To protect against possible personal injury due to abrupt start of the machine, be sure to start the follow-

ing work after turning the power off and ascertaining that the motor is at rest.

❶❷

❷

❶

❸

❷

❶

– 7 –

(4) Installing the rear roller

❶

❷

❸❹❺❻

1) Fix rear roller plate base

❶

with three wood screws

❷

For the installing position of the rear roller

plate base, refer to the drawing of the table.

2) Install rear roller asm.

❸

to rear roller plate base

❶

with

screw

❹

(M8), washer

❺

and clamp lever

❻

(5) Installing the suction pipe

１）

Fix suction pipe retaining plate

❶

with setscrews

❷

❶

❷

2) Install suction pipe ❶with screw ❷and washer ❸.

Secure suction pipe retaining plate ❺and suction pipe

❶ with cable clip ❹.

❸

❶

❺

❹❷

– 8 –

Adjust so that the right-hand end of the elactic band meets

the left-hand side of collar

❺

of the front roller and collar

❸

of the intermediate roller when putting straight the elac-

tic band on the front roller. Adjust in accordance with the

procedure below.

1) Loosen two screws ❶, adjust elactic band guide ❹to

the elactic band width, and tighten two screws ❶.

2) Loosen screw ❷, adjust collar ❺to the position of the

right-hand end of elactic band, and tighten screw ❷.

3) Loosen screw ❻ in collar ❸ of the intermediate roller,

and move collar ❸ to the right or left in accordance

with the elactic band width. At this time, make sure that

the elactic band is put straight. Then tighten screw ❻.

Do not excessively tighten screws ❶and ❻.

Deformation of collars will be caused.

11. ADJUSTING PROCEDURE OF THE POSITION OF THE TENSION ROLLER

(1) Adjusting the lateral position

❹

❶

❷

❺

Elactic band

❻

❺

❸

(2) Adjusting the vertical position and longitudinal position of the tension roller

Loosen clamp lever ❶and screw ❷. Adjust the height

and longitudinal position of the front roller.

After the adjustment, tighten clamp lever ❶and screw ❷.

❶

❷

WARNING :

To protect against possible personal injury due to abrupt start of the machine, be sure to start the follow-

ing work after turning the power off and ascertaining that the motor is at rest.

Contact

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