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Installation

               

  ★  Machine  installation  should  onl y  be

                          carried  out  by  a  qual ified  technician.

                    ★  Conta ct  your  Unicorn  dealer  or  a 

                          qualified  electricia n  for  any  electrical

                          work  that  may  need  to  be  done.

                    ★  The  sewing  machine  weighs  more  than

                          33  kg.

                          The  insta llation  should  be  carried  out  by

                          two  or  more  people.

                    ★  The  top  of  the  table  should  be  40  mm

                          in  thickness  a nd  should  be  strong

                          enough  to  hold  the  weight  and 

      withstand  of  the  sewing  machine.

  ★  Do  not  connect  the  power  cord  until 

        installation  is  complete.  otherwise  the

                          machine  may  opera te  if  the  treadle  is

                          depressed  by  mistake,  which  could

    ★  Be  sure  to  connect  the  ground.  If  the

          ground  connection  is  not  secure,  you

                          run  the  risk  of  receiving  a  serious 

        el ectric  shock.

  ★  Ref er  to  the  instruction  manual  for

        motor  for  details  on  install ing  and

                          using  the  motor.

                       

 

★  All  cords  should  be  secured  at  least 

        25  mm  away  from  any  moving  parts.

                            Furthermore.  do  not  excessively  bend

                            the  cable  or  secure  it  too  firmly  staples,

       

        otherwise  shocks  could  occur

       

  ★  install  the  belt  covers  to  the  machine

       

        head  and  motor.

       

  ★  Be  sure  to  wear  protective  goggles  and 

       

        gloves  when  handling  the  lubricating  oil 

                            a nd  grease,  so  that  they  do  not  get 

                            into  your  eyes  or  onto  your  skin,

                            otherwise  inflammation  can  result.

                            Furthermore,  do  not  drink  the  oil  or  eat

                            the  grease  under  any  circumstances, 

                            a s  they  can  cause  vomiting  and 

                            diarrhoea. 

                            Keep  the  oil  out  of  the  reach  of

                            children.

       

    ★  Avoid  setting  up  sewing  machine  near 

       

          sources  o  strong  el ectrical  noise  such

                              as  high-frequency  welding  equipment.

                              If  this  precaution  is  not  taken, 

                              incorrect  machine  operation  may  result.

Sewing

★  This  sewing  machine  should  only  be

      used  by  operators  who  have  received

                        The  necessary  training  in  saf e  use

      before  hand.

★  The  sewing  machine  should  not  be  use

        f or  a ny  applications  other  than  sewing.

       

    ★  Do  not  touch  any  of  the  moving  parts

       

          or  press  any  objects  against  the 

                              machine  while  sewing.  as  this  may

                              result  in  personal  inj ury   or  damage  to  

                              the  m achine.

                    ★  Wait  at  least  5  minutes  after  turning  off  the  power  switch  and  disconnecting 

                          the  power  cord  from  the  wall  outlet  before  opening  the  face  plate  of  the  control  box.

                          Touching  areas  where  high  voltages  art  present  can  result  in  severe  injury.

ꍾ 

Notes  on  safety 

                                                   

       

     

         

                                                                               

       

Summary of Contents for LS2-H520

Page 1: ...LS2 H520 LS2 H5200 SINGLE NEEDLE NEEDLE FEED LOCK STITCH SEWING MACHINE WITH THREAD TRIMMER 1 OPERATION MANUAL PART BOOK...

Page 2: ......

Page 3: ...symbol at left means beware 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 t...

Page 4: ...5 off A S 33 2 40 25 OFF A S A S...

Page 5: ...belt covers 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...

Page 6: ...placing the bobbin and needle when 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 dur...

Page 7: ...rician to carry out any 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 ma...

Page 8: ...act your nearest UNICORN 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...

Page 9: ...ing machine is first turned 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 m...

Page 10: ...L DESCRIPTION 7 1 Upper shaft and needle bar mechanism 7 2 Thread wiper 7 ADJUSTMENT 8 16 1 Adjusting the needle bar height 8 2 Adjusting the rotary hook position 8 3 Adjusting the rotary hook holder...

Page 11: ...1 How to install 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...

Page 12: ...he oil cover Screw Wipe 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 Rem...

Page 13: ...he machine with the needle tip below the needle plate when the needle position switch is set to the needle down position Back treadle the pedal to position and release it to neutral to trim the thread...

Page 14: ...4 OPERATION 3 Threading the needle...

Page 15: ...bin case tension spring 3 Pull the thread from the bobbin case tension spring 5 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...

Page 16: ...tension at this time is 25 30g To adjust 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...

Page 17: ...turned on the thread trimming solenoid activates pressing the thread trimming cam lever stud The roller shaft of the thread trimming cam lever assembly secured by the thread trimming cam lever stud i...

Page 18: ...rejector needle bar bush 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...

Page 19: ...heck that the needle tip is as indicated 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 b...

Page 20: ...parallel loosen the screw 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...

Page 21: ...m 3 0 6 0 8mm 4 0 5mm 40Kg 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 trim...

Page 22: ...the indentation of the 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...

Page 23: ...ve the feed bracket up 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...

Page 24: ...ard and backward at the inching speed 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...

Page 25: ...osition there should 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...

Page 26: ...Raise the presser foot 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 p...

Page 27: ...17 4 4 16 15 15 15 4 4 4 6 6 6 2...

Page 28: ...y hook timing 15 Thread wiper too high Thread wiper position Adjust thread wiper position with screw Thread breakage Improper threading Threading Rethread 4 Bent needle Blunt needle tip jammed eye Nee...

Page 29: ...19 4 4 1 4 4 15 15 15 6 6...

Page 30: ...esser 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...

Page 31: ...21 6 6 6 6 puff 15 19 23 4 22 19 23 19...

Page 32: ...ok stop gap too small Gap 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 no...

Page 33: ...23 6 1 22 6 24 24 24 24...

Page 34: ...ead cutter signal not 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 befo...

Page 35: ...25...

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