ELNA 745 - Bedienungsanleitung

745/845

SERVICE MANUAL

2.5

3.5

6.0 B

T|P

TABLE OF CONTENTS MODEL 745/845

A.General directions and recommendations

B. Recommendations

C. Mechanical sewing disorders

D. Adjustment of the automatic tension unit

E. Position of program selection - display drum indicator and display window

F. Position of display drum indicator and upper looper shifting cam

G. Adjustment of the Chain looper tension dial

H. Gauge for the after - sales service

1. Removing Machine Base and Back Cover

2. Removing Front Cover and Mounting Covers

3. Angular position of balance weights and position of eccentrics

4. Height and alignment of cloth presser bar

5. Height and orientation of needle bar in relation to the needle plate holes

6. Height - clearance - angular position of lower looper

7. Clearance of needle guards

8. Timing of lower looper

9. Angular position of upper looper

10. Clearance and timing of upper looper to lower looper

11. Chain looper : angular position - clearance - orbital timing - clearance of chain

needles guards

12. Chain looper thread take up rotary cam

13. Height of feed dog

14. Moving cutter and vertical feed timing

15. Horizontal feed timing against chainstitch needle

16. Differential feed

17. Position of fixed cutter and cutting width dial setting

18. Position of loopers threads take up lever

19. Safety device - Side Cover and Front Flap

20. Safety device - Presser foot and Needle Clamp Safety Lever

21. Top Cover device(for Model 845)

ANNEX

ޓTools for setting SL/DF Dials

ޓSetting positions of SL/DF Dials

ޓClearance between Feed Dog and Needle Plate

ޓTrouble shooting - Cover Hems

ޓCover Hem stitch formations

GENERAL DIRECTIONS AND RECOMMENDATIONS A

Safety

For safety reasons, the sewing machine must be disconnected from the mains:

- Whenever the machine is left unattended

- Whenever preparing the machine for sewing

- Whenever servicing

- Whenever replacing mechanical or electrical parts or accessories

Needles

Usually needles of the system 130/705 H may be used. However, in certain cases stitch

quality may be improved by using type ELX 705 needles.

Choose needle size No.80 for sheer materials and No.90 for normal or thick materials.

Threads

Choose a good quality polyester thread or blended thread.

Lubrication

Besides the 2 oiling points marked in red, the machine is equipped with self-lubrication

bearings and parts. Lubricate the machine as follows: when using it for the first time - if it

has not been used for some time - when it has been intensively during 7 to 8 hours.

RECOMMENDATIONS B

1. Never connect the machine to a different voltage than that marked on the specification plate.

2. For safety reasons, never perform any repairs on the power supply circuit without first

removing the mains lead from the machine.

Never plug in or run the machine unless all the connections are correctly set.

When changing the light bulb, it is neccessary to disconnect the mains lead.

MECHANICAL SEWING DISORDERS C1

First of all, please refer to the paragraph entitled "maintenance" in the instruction manual,

especially when machine does not turn freely by turning the flywheel by hand. If necessary,

check and adjust tightness of motor belt.

Given below are the most frequent disorders. In most cases, they can be remedied by checking

the adjustments in the following order. However, before checking the adjustments, make sure

that the threading is correct and that all the thread passages are okay.

1. Skipped overlock stitches

Check and adjust if necessary:

- Needle bent or with a dull point - replace needle

- Needle not set correctly - refer to "changing the needle" in the instruction manual

- Burrs on upper or lower looper - polish

- Burrs on stitch tongue - polish

- Excessive tension on the needle thread

- Height and orientation of needle bar

- Clearance between point of lower loopers and needle

- Clearance between upper and lower loopers

- Timing of upper and lower loopers against needle

- Feed timing

2. Skipped chainstitches - Cover hems

Check and adjust if necessary:

- Needle and chain looper thread tensions not balanced

- Needle bent or with a dull point - replace needle

- Needle not set correctly - refer to "changing the needle" in the instruction manual

- Burr on chain looper - replace or polish

- Dull blade edge on moving cutter - replace

- Chain looper needle clearance

- Chain needle guard clearance

- Angular position of chain looper

- Orbital timing of chain looper

- Chain thread take up lever timing

- Height and orientation of needle bar

- Needle plate spring plate bent

Clearance and position between back of chain looper and needle L0

Note: For more information, see pages ANNEX ΦΧ.

MECHANICAL SEWING DISORDERS C2

3. Thread breakage

Before checking the adjustment, make sure of the good quality of the thread and the needle,

the correctness of threading and the smoothness of all the thread passages. Quite often, an

injury to thread passage is the cause of thread breakage. If all these points are in order, check

the following:

- Dull point of needle or bent needle - replace.

- Dull or burred point of looper - replace.

- Scratch or injury on stitch tongue of needle plate - replace.

- Too strong thread tension.

- Unsmooth or injured edge of needle hole on needle plate (thread breakage of chain stitches)

- replace.

4. Irregular stitches

- Inadequate setting of thread tensions - re-adjust.

- Unsmooth thread passage - polish.

- Height of feed dog.

- Position of looper thread take up levers and thread guides.

- Dull blade edge of moving cutter - replace.

- Injury on needle plate face or presser foot sole - replace.

- Incorrect alignment of pulled-up thread antenna with spool pins - reset it at correct position

to align to spool pins.

5. Breakage of needle

Check and adjust if necessary

- Dull point of needle or bent needle - replace.

- Incorrect placement of needle - refer to "changing the needle" in the instruction manual.

- Clearance of needle guard and (chain needle).

- Incorrect alignment of needle holes of presser foot and needle plate.

- Clearance from needle to lower looper.

- Clearance between the upper and lower loopers.

- Feed timing.

- Horizontal feed timing against chain-stitch needle.

ADJUSTMENT OF THE AUTOMATIC TENSION UNIT D

1. Remove: Mains lead - Front cover.

2. Select sewing program 1 "SAFETY 4 THREAD"

3. Make sure that all the tensiondials are set at "N" position

4. Use a 50 (3ply) cotton thread to check the tension values with the tension gauge.

Blue tension : 50 to 60 gr.

Red tension : 35 to 45 gr.

Yellow tension : 10 to 15 gr.

Green tension : 20 to 25 gr.

5. If not, adjust the tension(s) with the fine tuning dial "d". The tension can be adjusted by

using small minus screw driver.

6. If one of the tension dial "r" is not aligned with the other dials when tensions are set at

"N" position, then proceed as follow:

Slide and hold the dial to the left side, make sure that the pinion on the dial "r" is

disconnected to the drive gear "s".

Rotate dial "r" towards the back (maximum position), and set drive gear "s" in its initial

position. See figure B . Then slide pinion dial "r" back into drive gear "s" and recheck

the position.

1. Remove: Mains lead - Front cover.

2. Select sewing program 1 "SAFETY 4 THREAD"

3. Check and make sure that the lever "h" is facing the notch of tension cam "g" for blue

needle thread.

4. If not, loosen screw "a" and turn DT cam pulley "j" forward or backward until the lever

"h" is facing the notch of tension cam "g". Then, tighten screw "a".

5. If the position of the display drum indicator "d" is not aligned with the display window

"e", then loosen screw "c" and adjust the position of drum.

6. Fasten screw "c" and recheck the position of the display drum "d".

Note: In order to check the alignment of the display drum indicator "d" and the display

window "e", it is necessary to set the front cover onto the machine.

POSITION OF PROGRAM SELECTION-DISPLAY DRUM INDICATOR

AND DISPLAY WINDOW

SELECT

2 mm

POSITION OF THE DISPLAY DRUM INDICATOR

& UPPER LOOPER SHIFTING CAM F

1. Remove: Mains lead - Front cover

2. Make sure if tension cams and levers are set in proper positions when selecting sewing

program 1 "SAFETY 4 THREAD". (See and Check Page E).

3. Select sewing program 10 "COVER HEM/CHAINSTITCH".

4. Bring the needle bar to its lowest position by turning a handwheel toward you.

5. Loosen screw "a" and turn the upper looper shifting cam "b" until the hook of the looper

follower "c" falls into the V-shaped hollow of the cam "b" (See View A ). Check if a

cam "b" and looper follower "c" are positioned as shown in View B .

6. Fasten screw "a" and recheck if the upper looper shifting connector "d" is pulled

up by a spring.

view A b

view B

SELECT

2 mm

1.0~1.5mm

THE ADJUSTMENT OF THE CHAIN LOOPER

TENSION DIAL G

1. Remove: Mains lead - Front cover

2. Open Front Flap.

3. Peel a label "a" from the surface of screw "b" with a needle or a tool with sharp point

and remove a tension dial "c" (brown) by loosening a screw "b".

4. Use a 50 (3 ply) cotton thread to check the tension value with the tension

gauge.

Brown tension : 15 to 20 gr.

5. If not, adjust the tension value with the tension adjustment plate screw "d".

Turn the screw "d" by one notch clockwise to increase or in reverse to

decrease tension value.

6. Make sure if a notch of the screw "d" faces against an indicator "p". (See Fig. 1)

7. Set back a tension dial "c" with the mark "N" above into a shaft "e". (See Fig. 2)

8. Fasten a screw "b" and put back a label "a" with glue.

Fig.1 Fig.2

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