Unicorn LS2-H550 Скачать руководство пользователя страница 38

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TROUBLESHOOTING GUIDE

Pro blem

Cause

Ch eck

Solution

Page

Th read fraying

or breakage

Burr in thread path

―

Remove with
sandpaper.

Blunt needle tip

―

Replace needle.

Skipped

stitch es

Improper needle

installation

Needle facing, height

Reinstall needle.

Wrong needle for
application

Needle size, length

Replace needle with
larger count needle.

Bent needle

Blunt tip

Needle

Replace needle.

Blunt rotary hook point

Rotary hook point

Replace rotary hook

Improper threading

Threading

Rethread.

Poor presser foot
contact

Presser bar pressure

Tighten presser foot

adjustment screw.

Presser bar height

Adjust presser bar
height

Improper needle to rotary
hook timing

Needle bar rise

Adjust needle to rotary

hook timing

Needle bar height

Adjust needle to rotary
hook timing.

Needle to rotary

hook timing

Tighten presser foot

adjustment screw.

Needle thread remainder
too short; does not
remain in material.

―

Adjust pretension.

Bobbin spins  during  thread
cutting  and  bobbin  thread
  remainder  gets too  short;
  won't rise.

Bobbin presser

spring

Replace bobbin presser

spring.

Thread take-up spring
tension too weak, won't
raise bobbin thread.

Thread take-up

spring tension

Adjust take-up spring
tension

All manuals and user guides at all-guides.com

Содержание LS2-H550

Страница 1: ...1 OPERATION MANUAL PART BOOK LS2 H550 LS2 H5500 SINGLE NEEDLE FEED LOCKSTITCH WITH SIDE CUTTER SEWING MACHINE WITH THREAD TRIMMER All manuals and user guides at all guides com a l l g u i d e s c o m...

Страница 2: ...All manuals and user guides at all guides com...

Страница 3: ...eware of injury This symbol indicates something that you must not do This symbol indicates something that you must do The picture inside the circle indicates the nature of the thing that must be done...

Страница 4: ...5 off A S 31 2 40 25 OFF A S A S All manuals and user guides at all guides com...

Страница 5: ...overs to the machine head and motor Be sure to wear protective goggles and gloves when handling the lubricating oil and grease so that they do not get into your eyes or onto your skin otherwise inflam...

Страница 6: ...not using the machine and when leaving the machine unattended For machines with automatic presser lifter do not touch the solenoid section because if becomes hot during operation and may cause severe...

Страница 7: ...y maintenance and inspection of the electrical system Turn off the power switch and disconnect the power cord from the wall outlet at the following times otherwise the machine may operate if the tread...

Страница 8: ...N dealer The positions of the labels may vary slightly depending on the model of sewing machine or motor 1 2 Be sure to connect the ground If the ground connection is not secure you run a high risk of...

Страница 9: ...rned on verify the rotational direction of the pulley with the power on The pulley should rotate counterclockwise when viewed from the pulley Power must be turned off when the machine is not in use or...

Страница 10: ...8 4 Needle feed mechanism 8 5 Feed regulation mechanism 9 6 Thread wiper 9 7 Knife mechanism 10 8 Thread trimmer 11 14 ADJUSTMENT 15 24 1 Adjusting the needle bar height 15 2 Adjusting the rotary hook...

Страница 11: ...l the belt V V 13mm 16mm Tilt back the machine head and place the belt onto the motor pulley and machine pulley Press belt with a finger force of 5 N and adjust the nut so that there is a deflection o...

Страница 12: ...off any contamination from the magnet and the oil pan Use the oil specified by Spindle15 2 Adjusting lubrication for upper shaft and rotary hook 1 1 Upper shaft lubrication Remove the face plate and...

Страница 13: ...e needle plate 2 Upper knife operation To operate the upper knife lower the upper knife set lever The upper knife will now operate in sync with the operation of the machine To stop the upper knife rai...

Страница 14: ...needle DB 1 Insert the needle completely making sure that the lengthwise groove of the needle is on the left and secure it using the set screw Use a DBx1 needle 4 Threading the needle All manuals and...

Страница 15: ...3 Pull the thread from the bobbin case tension spring 6 Winding the bobbin thread 1 2 3 4 1 Fit the bobbin in the bobbin winder shaft 2 Depress the joint as far as it will go 3 Wind the bobbin thread...

Страница 16: ...djust the operation range of the thread take up spring loosen the set screw and turn the thread tension bracket assembly To adjust the tension of the thread take up spring fit a screwdriver into the s...

Страница 17: ...mp moves the needle bar vertically 4 The needle bar is guided by the needle bar bracket 2 Lower shaft and rotary hook mechanism 1 2 3 1 When the pulley turns in the direction of the arrow the bevel ge...

Страница 18: ...eed rocker shaft and the feed rocker bracket arm 5 When the inclination of the feed regulator and the pivot point of the level feed link change the horizontal momentum of the level feed arm link chang...

Страница 19: ...nclination decides the feed amount of the feed rocker mechanism and the needle bar mechanism Pressing the reverse lever reverses the inclination of the feed regulator to feed the material in reverse 1...

Страница 20: ...tric wheel with the screw moves vertically at the cam part eccentric part of the thread take up crank assembly 4 The knife driving link the knife driving rod and the knife shaft clamp assembly attache...

Страница 21: ...figures show the thread trimmer without the rotary hook assembly 1 During operation The thread trimmer cam lever spring presses the thread trimmer cam lever assembly against the thread trimmer soleno...

Страница 22: ...of the thread trimming clutch 3 Movable knife holder action Due to the rotation of the lower shaft the thread trimmer clutch pushes the roller shaft up The motion of the roller shaft is transmitted t...

Страница 23: ...he thread trimmer clutch and returns to its original position The thread trimmer lever spring returns the thread trimmer rod and the movable knife holder to their original positions in the direction o...

Страница 24: ...tly above its lowest position the upper shaft has turned approximately 330 and the needle thread is spread by the movable knife as shown in the figure above If the timing of the movement is too early...

Страница 25: ...h Then firmly tighten the screw A 0 0 5mm 0 0 05mm Align the bottom reference line of the needle bar with surface A of the needle bar oil rejector needle bar bush by turning the machine pulley slowly...

Страница 26: ...icated below For thin materials The needle tip is aligned with tips of the feed dog and the upper surface of the needle plate For thick materials There is a 5mm gap between the needle tip and the uppe...

Страница 27: ...ew of the needle feed arm then move the needle bar bracket forward or backward 2 Feed dog position Set the feed regulating dial to maximum and turn the machine pulley Check that the needle enters the...

Страница 28: ...0Kg 1 Loosen the screw and turn the machine pulley until the needle bar is raised 5 mm above its lowest position then depress the thread trimming solenoid 2 With the thread trimming solenoid depressed...

Страница 29: ...thread trimming clutch 3 With the thread trimming solenoid depressed turn the machine pulley Adjust the movable knife and the fixed knife so that they overlap when the rotation of thread trimming clut...

Страница 30: ...or down 1 2 2 90 1 When the feed dog is fully raised its angle is properly adjusted if the circle on the feed bracket shaft aligns with the index on the feed rock shaft arm 2 To adjust the feed dog an...

Страница 31: ...ed 215 spm 3 Adjust as follows when the forward and backward stitch lengths are different 1 Remove the rear plate 2 Loosen the screw 3 When the forward stitch length is greater than the backward set t...

Страница 32: ...ould be a 9 5 11 5 mm gap between the upper surface of the needle plate and the needle tip with thin or medium materials or a 10 12 mm gap with thick materials If adjustment of needle stop position is...

Страница 33: ...using the presser bar lifter 2 Remove the screw and the needle plate 3 Remove the screws and the feed dog 4 Remove the screws and the auxiliary needle plate 5 Turn the machine pulley until the needle...

Страница 34: ...he back edge pf the upper knife should be aligned with the needle center The upper knife can be adjusted by loosening the screw and moving the knife within a range of 2 mm forward to 3 mm backward 3 U...

Страница 35: ...25 4 4 16 15 15 15 4 4 4 6 6 6 2 All manuals and user guides at all guides com...

Страница 36: ...igh Thread wiper position Adjust thread wiper position with screw Thread breakage Improper threading Threading Rethread 4 Bent needle Blunt needle tip jammed eye Needle Replace needle 4 Improper needl...

Страница 37: ...27 4 4 1 4 4 15 15 15 6 6 All manuals and user guides at all guides com...

Страница 38: ...ser bar pressure Tighten presser foot adjustment screw Presser bar height Adjust presser bar height Improper needle to rotary hook timing Needle bar rise Adjust needle to rotary hook timing 15 Needle...

Страница 39: ...29 6 6 6 6 puff 15 19 23 4 22 19 23 19 All manuals and user guides at all guides com...

Страница 40: ...ap Adjust needle to rotary hook timing 15 Improper thread cutting a Needle bobbin threads not cut b Needle thread not cut c Bobbin thread not cut Movable knife fixed knife do not overlap Adjust knives...

Страница 41: ...31 6 1 22 6 24 24 24 24 All manuals and user guides at all guides com a l l g u i d e s c o m...

Страница 42: ...transmitted Check circuits refer to motor adjustment manual Thread wiper does not function Needle thread remainder too long Adjust pretension 6 Timing too early wipes thread before tension disc closes...

Страница 43: ...33 All manuals and user guides at all guides com...

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