I.Major structure of computerized embroidery machine(the 13 parts)

01: stand 02: The gear box of main shaft; 03: rotary Encoder;
04: hook base; 05: color change system; 06:arm; 07:needle bar case 08; Y-axis drive system; 09: X-axis drive system; 10: tension base; 11:cam drive set; 12: Embroidery frame; 13: upper thread holder set

A.The computerized embroidery machine fault and solutions (mechanical part): (fault reason, solutions)
  1. The main shaft motor cannot work after pulling the bar switch:
    2.          Fault reason          Solutions
    1. Machine didn’t stop at 100°.
    2. Machine stopped with frame outbound.
    3.  Mechanism trouble.
    4. The control switch of main shaft shut.
    5. No function confirmation.
    6. Correlative fuse has blown.
    1. manually move the main shaft to 100。.
    2.  Adjust limit switch, and move embroidery frame reverse.
    3.  Find the locked position and remove it.
    4.  Turn on the switch.
    5.  Adjust the indicator lights till it light up and then run the machine;
    6.  Replace it. 
  2. Pattern loses shape
    3.          Fault reason          Solutions
    1. The embroidery frame is too heavy.
    2.  The trimming belt is too loose or too tight.
    3. The guide rail friction is big, with foreign matter in.
    4. The link between the main shaft and the timing belt is loose;
    5. Driving bearing failure.
    6. The friction between the embroidery frame and the table is too big ：
      1. The Nylon rail is loose;
      2. The Nylon rail has gap.
      3. The link between the stepping motor and shaft is loose, the pin is loose.
    7. The embroidered material is loose.
    8. Data error due to outside disturbance.
    9. Electrical equipment error.
    1. Lighten the weight of embroidery frame.
    2. Adjust the tension of the timing belt in the X and the Y direction;
    3. Clean it, add lubricating oil;
    4. Check the porcelain enameled set screw、spring pin and tighten them.
    5. Check the driving bearing and replace it if it broke;
    6. Check and look whether the embroidery frame is warped and whether the screw on the embroidery frame is overdue;
    7.  Add mount and tighten it again.
    8.  Input pattern again;
    9.  Reference to electrical equipment fault and solutions.
  3. Thread breakage detection is not good: Including not detection and misdetection
    4.          Fault reason          Solutions
    1. The contact between the thread take-up spring and tension stud （copper column） is not good, it won’t detect if the thread take-up spring is over loose; And misdetection or thread breaks if it’s over tightened;
    2. Embroidery thread leaves its course.
    3. The tension of embroidery thread is too loose or too tight.
    4. The linked timing belt between 05 parts and 010 parts is loose.
    5. Conductive cam and U-spring contact is bad.
    6. Conductive cam is loose, location changes.
    7. Adjacent conductive cam isn’t at right location, contact spring spacer with   misdetection.
    8. Corresponding security, connection-peg of electric break checking board connection-peg is spoiled or loose.
    1. Check the location of the thread take-up spring, wipe it up or change. Adjustment method: contrarotate central screw, making the thread take-up spring leave copper column, then clockwise turns central screw until the spring touch the copper column, with that continuously turn more 15 degrees around on again;
    2. Adjust thread course again.
    3. Adjust 3 tension-side timing pulleys with a right tension, making the spring touch copper column when thread take-up bar takes up thread, and spring leave copper column when letting go thread.
    4.  Tighten it, adjust tension, change.
    5. Unbolt the bolt, adjusting the location and joint.
    6. Adjust location.
    7. Adjust location of adjacent cam.
    8. Reference to the fault reason and solutions of electrical equipment.
  4. Color change system Fault: cannot change color at right place or do not change color.
    5.          Fault reason          Solutions
    1. The parking place is abnormal.
    2. Without needle position signal (needle position lamp do not light).
    3. Location of color change cam changed.
    4. Location of thread take-up bar changed.
    5. Machine jammed.
    6. Place of needle bar case changes.
    7. Locations of needle bar driving reciprocator change.
    8. Electrical fault. 
    1. Rotate the main shaft to 100 degrees by hand.
    2. Make the 2nd indicator lights light by hand and check 05 parts;
    3. Eliminate camshaft gap and tighten screw.
    4. Check 06 parts and see if the locations of fan-shaped gear changes, or loose, wear out, adjust the height of thread take-up bar;
    5. Check the coordination parts of 05, 06 and 07 parts.
    6. Check needle position against needle plate hole.
    7. Check coordination position between needle bar reciprocator and needle bar.
    8. Reference to the fault reason and solutions of electrical parts.
  5. Needle broke
    6.          Fault reason          Solutions
    1. Needle doesn’t right aim at the needle plate hole.
    2.  Place of color changing system changes.
    3.  Needle is poor quality and needlepoint is obtuse.
    4. The phase of lower shaft changes, needle meet rotary hook and bobbin case.
    5. Cannot cut thread at the very place, and movable knife doesn’t return to its position, when manually move the main shaft to 100 degrees;
    6. Start machine when pulling thread.
    1. Turn main shaft to 140 degree and adjust the needle position.
    2. Adjust color changing system place;
    3.  Change needle in high quality.
    4. Check the phase at 196 degree; check rotary hook and look whether it’s loose, whether bobbin case is put to right position.
    5. Check thread cutting system; return the movable knife to right position.
    6. Change custom.
  6. Jumping stitch (missing stitch)
    7.          Fault reason          Solutions
    1. Needle quality is poor, needle is not straight, or needlepoint is obtuse.
    2.  Needle number and thread diameter are not suitable.
    3. Location of needlepoint and bobbin tine change.
    4. Height of needle bar changes.
    5. Tension between upper thread and bottom thread are not suitable.
    6. Embroidery cloth doesn’t be firmly tightened, loosen;
    7. Sometimes jump solenoid doesn’t rebound
    8. 06 － 34 spring rebounds weak.
    1. Using high－quality needle.
    2. Change needle or thread.
    3. Check and adjust 196-degree parameters.
    4. Check and adjust 172-degree parameters.
    5. Adjust upper thread and bottom thread tension;
    6. Adjust.
    7. Adjust.
    8. Change.
  7. Thread collecting is not tight (thread nesting)
    8.          Fault reason          Solutions
    1. Upper thread tension is little.
    2. Bottom thread tension is little.
    3. Thread is of poor quality.
    4. Bottom thread tension is not steady.
    5. Lubricate of rotary hook is bad.
    6. The thread tension isn’t suited with embroidery material;
    7. Bobbin case warps.
    1. Adjust.
    2. Adjust.
    3. Use high quality thread.
    4. Clean bobbin case.
    5. Add lubricant oil.
    6. Adjust tension.
    7. Change bobbin case.
  8. Needle Bar falls: one needle bar loses control and falls when stopping machine.
    9.          Fault reason          Solutions
    1. Jump solenoid without movement.
    2.  Jump solenoid have movement, but location changed.
    3. Upper connecting pin of the needle bar changes the position and move around.
    4. Needle bar reciprocator changed the position or worn out, or jammed.
    5. Electrical fault. 
    1. Check thread、plug , check whether it was spoiled.
    2.  Check whether it’s loose, adjust location forwards、rightwards.
    3. Check whether the gap between stopper and connecting pin is big, change;
    4. Check axle and thimble of needle bar reciprocator slide block, find out the locked position, adjust location, change.
    5. Reference to the fault reason and solutions of electrical parts.
  9. Needle bar does not do any embroidery: one needle bar does not do any embroidery during machine working.
    10.          Fault reason          Solutions
    1. Positioning block of needle bar is low.
    2. Reciprocator doesn’t rebound after turning towards the right.
    1. Unscrew, turn main shaft to 0 degrees and adjust it.
    2. Check whether machine is jammed, and check whether spring is spoiled. 
  10. Needle bar vibrated: certain needle bar is still vibrating after it is locked during embroidering.
    11.          Fault reason          Solutions
    1. Upper positioning block of needle bar is high;
    1. Unscrew, turn main shaft to 0 degrees and adjust it.
  11. Thread looping and nesting at needle hole: During embroidering the thread of one needle are not broken but furcated, only one strand is embroidering in needle hole, the left stand nesting at the needle hole.
    12.          Fault reason          Solutions
    1. Thread is of poor quality.
    2. Needle bar is a little higher.
    3. Thread route hole is not smooth.
    1. Use high-quality thread.
    2. Adjusting parameter at 196 degrees.
    3. Check thread course hole, and polish it.
  12. Thread cutting no good.
    13.          Fault reason          Solutions
    1. Thread cutting position changes:
      1. Movable knife and thread cutting rod is loose;
      2. Position of thread cutting system cam changes;
      3. Solenoid position changes, the cam ring raising position is low.
      4. Open-close location of movable knife is low.
    2. No thread cut.
      1. Coordination between movable knife and fixed knife is not good;
      2. Position of movable knife changes;
      3. Movable knife and fixed knife have no edge;
      4. Open and close position of movable knife changes;
      5. Cover plate spring presser of under thread position changes;
      6. Movable knife and its shaft are loose.
    3. Thread cutting short.
      1. Lower thread tension changes;
      2. Rotary hook warps;
      3. Position of under thread presser changes;
      4. Under thread presser warps;
      5. Position of DIPswitch in computer is adjusted.
    4. Electrical fault.
      1. Tighten it;
      2. Adjust;
      3. Adjust;
      4. Adjust.
      1. Adjust angle of fixed knife;
      2.  Adjust;
      3. Change;
      4. Check and adjust the 290-degree open position and 100-degree close position;
      5. Adjust;
      6. Firmly tighten it.
      1. Adjust tension of lower thread;
      2. Change;
      3.  Adjust;
      4. Change;
      5. Put it to the position of long thread cutting.
    4. Reference to the fault reason and solutions of electrical equipment.
  13. Upper thread hooking no good.
    14.          Fault reason          Solutions
    1. Upper thread cannot be cut, upper thread is  short.
      2. A.Cutting knife position changes;
      B.Picker position changes;
    2. Thread hooking at its position.
      3. A.Upper thread hooking device have been locked dead;
      B.Thread hook position changes, the hook is not at its position after thread hooking;
      C.Felt support of 07 parts are loose;
      D.Thread hooking solenoid doesn’t work.
      2. A.Adjust knife location;
      B.Adjust angle;
      3. A.Unlock it;
      B.Adjust hook location;
      C.Adjust and firmly tighten it;
      D.Check thread, change.
  14. Thread broken.
    15.          Fault reason          Solutions
    1. Needle.
      2. A.Needle quality is not good, needle groove and hole are not well polished, needlepoint blunt;
      B.Needle is incorrectly installed, installed the contrary;
      C.Needle is bent, hasn’t been installed to its position;
      D.There are attachment (such as sticky etc.) into needle hole;
      E.The position of needle fix screw is incorrect;
    2. Line.
      3. A.Thread is of poor quality;
      B.The thread number is not suited with the needle number;
      C.The tension of upper and lower thread is big;
      D.The joint on the thread tower is too much;
      E.Thread is away from the thread course;
    3. Hole.
      4. A.The needle plate hole is flocky, not smooth;
      B.Thread course hole has burr;
      C.There is burr on the thread suspender disk.
    4. Rotary hook.
      5. A.There is nick (cut) on rotary hook;
      B.Surface of rotary hook has cut;
      C.Bobbin case, rotary hook warped;
      D.There is cut on rotary hook support;
      E.Lubricate of rotary hook is bad.
    5. Parameters.
      6. A.196-degree and 172-degree position change.
    6. Pattern.
      7. A.pattern is overdense.
      2. A.Use high quality needle;
      B.Install again;
      C. Install again, install it up to the limit;
      D.Clean it or change;
      E. Adjust it and turn 30 degrees towards the right.
      3. A.Use high quality line;
      B.Change needle or thread;
      C.Adjust tension of the upper and lower thread;
      D.Pull thread or change;
      E.Clear the thread route up.
      4. A.Polish or change;
      B.Polish or change;
      C.Change;
      5. A.Polish or change;
      B.Polish or change;
      C.Change;
      D.Polish or change;
      E.Add lubrication.
      6. A.Adjust parameter and height of needle bar.
      7. A.reediting.

B. Daily maintenance, clearance and check.

  1. Daily maintenance: Computerized embroidery machine is running continuously; it’s mechanical equipment with high efficiency, so, the daily maintenance and attention is the guarantee, that machine can work stably and have long using life.
    2. Clear the parts Cleaning position Time interval Cleaning method

    1.Hook base(04 parts)

    A、11 and 13, 04 parts

    1.Rotary hook、bobbin case, and bobbin
      A.Rotary hook support、
      B. movable knife、fixed knife and spring pressure

    		 1.Every Day
      A.Every day
      B.Every Week    		 1.Clear thrum and other useless things with hairbrush ;
       A.Avoid by all means cleaning with hard tool.Ditto
    2.Needle bar case (07parts) 2.Thread take-up lever, thread course and felt; 2.Every Day 2.Clear away useless things and thrum;
    3 .Y-axle drive system (08parts) 3 .three pairs of guide rails on the behind and one the fore hind( 620 model); 3.Half of month 3.Clear away useless things and thrum;
    4.X-axle drive system (09parts) 4. Two pieces frame guide rails 4.Half of month; 4.Clear away useless things and thrum;
    5.Tension base (10parts) 5. First tension regulator, first tension disk, thread take-up spring, thread course 5.Regular; 5.Clear away useless things and scrape it;
    6.Working Table 6. Surface 6. Every day 6.Clear away useless things and scrape it;
    Computer surface 7. Surface and fan 7. Regular; 7.Wipe, open the back cover
    7.Driver box andPower supply box 8. Surface and ventilation 8.Regular 8.Ditto.
  2. Daily attention (regular add lubrication, and not add more every time)
  3. Computerized embroidery machine continuously work with high speed every day, so, the lubrication on its running parts is very important.
      1. Butter: No.2 Calcium base lubricating oil.
      2. White oil: The No.1 sewing machine oil
    Maintain parts Lubricate parts Kind of oil Time interval Maintenance method
    1.The gearbox of main shaft (02parts) 1.Chain wheel, Chain, bearing;
      A.Ball bearing and needle bearing;    		 1、Butter
       A.Butter    		 1.Every Month
       A.Half a year    		 1.Open the cover;
    Ditto
    2.Thread cutting device (04parts) 2.Rotary hook, bobbin case, shaft and shaft bushing;
       A. Taper gear;    		 2、White oil
      A.butter    		 2.Everyday
       A.Every Month    		 2.Hole of needle plate
      A.Open the needle plate
    3.Color change system (05parts) 3.Cam groove;
       A.needle position gear    		 3.butterA、butter 3.Half a year
       A. Half a year    		 3.Open the cover
      A.open the cover and move needle position to 6-needle position, pour oil through the oil groove
    4.Arm (06parts) 4.Needle bar drive shaft、take-up lever drive lever;
      A. Needle bar drive connecting rod;
      B. Bearing    		 4.white oil
       A.White oil
       B. Butter    		 4.Every day
       A.day
       B. Half a year    		 4.oil hole on the upper cover
       A. Open the upper cover
    5.Needle bar case (07parts) 5.Take-up lever shaft, needle bar; 5.White oil 5.Every day 5.Using pinhead to Pour the oil through the oil groove on the case rail
    6.Y-axle drive system (08parts) 6. The guide rail on the fore hind and on the behind; 6.butter 6.Every month  
    7.X-axle drive system (09parts) 7.Guide rail; 7. Butter 7.Every month  
    8.Tension base (10parts) 8.Gear; 8. Butter 8.Half a year 8.open the cover
    9. Thread cutting system (11parts) 9. Roller、chain and cam; 9.butter 9.Half a year  
    10.Embroidery frame (12parts) 10.rail plate crosswise.Guide rail 10.butter 10.Every year 10.Take away the embroidery frame.

    3、General check:
    Computerized embroidery machine continuously work with high speed, so the related parts such as screw、hexagon nut、washer and liner etc will be loose gradually . You can listen to the sound, and check them at any moment, which can prevent you from fault and reduces your loss. So the workers and the technicians should take circular check over the all the parts at any moment.

      1. Check whether it has unusual sound, if found any unusual sound, please stop machine to check it;
      2. Check whether machine has unusual movement, If found any unusual movement, please stop machine to check it.
      3. Check whether machine has bad smell, after having found it, stop machine to check it;
      4. Casually inspect the machine earthing condition to see if it’s electrified, guarantee safety;
      5. Casually check the power supply, power voltage and see if it is phase-lack;
      6. Inspect the table surface everyday, not put anything unconcerned with work on it;
      7. When inputting pattern into computer every time, shut machine power according to indication, then operate it;
      8. Inspect the maintenance and lubrication.