What to do if my JUKI Sewing Machine is skipping stitches?
If your JUKI sewing machine is skipping stitches, properly adjust the timing between the needle and looper. Also, if you are using a heavy-weight or rigid material (fabric), the needle guide should come into contact with the needle by 0.1 to 0.2 mm.
What to do if my JUKI Sewing Machine has excess thread?
If your JUKI sewing machine has excess thread, it could be due to several reasons. You can adjust the thread pull-off lever to a smaller or larger value. If the thread end comes from a point different from the needle penetration point, increase the button clamp pressure.
How to fix a JUKI Sewing Machine when threads are not trimmed?
If the threads are not being trimmed on your JUKI sewing machine, adjust the position of the moving knife if the thread separating claw of the moving knife fails to separate the thread on the fabric from the thread on the needle without fail. If the needle fails to enter the center of the holes in the button, adjust it with the jaw lever holder. If the last stitch skips at the needle entry point, adjust the looper, referring to '2.-(2) Positioning the looper'. If the height of the thread separating claw of the moving knife is incorrect, adjust the height of the thread separating claw of the moving knife, referring to '3.-(3) Adjusting the height of the thread separating claw of the moving knife'.
What causes my JUKI MB-1377 Sewing Machine to fail to produce stitches?
If your JUKI sewing machine fails to produce stitches, it could be due to improper adjustment of the thread pull-off lever (adjust it to a larger value) or because the thread tension applied by the face plate thread No. 3 is too high (decrease the tension applied by the face plate thread).
Why is my JUKI Sewing Machine experiencing mechanical malfunction?
Mechanical malfunctions in your JUKI sewing machine could arise from a low stop-motion noise, in which case you should adjust the stop-motion position. If the sewing machine stops before the predetermined stop-motion position is reached, decrease the button clamp spring force. If the driving pulley is too large, decrease the axial play in the driving pulley at the time of stop motion.
What to do if the needle thread breaks after the JUKI Sewing Machine has stopped?
If the needle thread breaks after your JUKI sewing machine has stopped, properly adjust the tensing lever. Also, make sure to adjust the amount of lift of the button clamp jaw lever to 8.5 to 9.5 mm. Finally, adjust the nipper clearance to 0.4 to 0.6 mm.
How do I fix a JUKI MB-1377 when the last fastening stitch is poorly tensed?
If the last fastening stitch is poorly tensed on your JUKI sewing machine, adjust the thread tensing lever. Also, adjust the nipper clearance to 0.4 to 0.6 mm and the thread bind notch timing.
Why does the thread slip off the needle eyelet of my JUKI MB-1377?
If the thread slips off the needle eyelet on your JUKI sewing machine, adjust the thread pull-off lever to a larger value. Also, adjust the clearance in the nippers to 0.4 to 0.6 mm.
Why is the length of thread remaining on the wrong side of the fabric after thread trimming too long on my JUKI MB-1377 Sewing Machine?
If the length of thread remaining on the wrong side of the fabric after thread trimming is too long on your JUKI sewing machine, adjust the position of the moving knife. Refer to '3.-(2) Adjusting the position of the moving knife.' Also, adjust the amount of lift of the button clamp jaw lever to 8 mm.
What causes both the needle thread and the thread on the wrong side of the fabric to be trimmed on my JUKI MB-1377 Sewing Machine?
If both the needle thread and the thread on the wrong side of the fabric are being trimmed on your JUKI sewing machine, adjust the position of the moving knife when the machine completes stop-motion, referring to '3.-(2) Adjusting the position of the moving knife.' Also, adjust the height of the thread separating claw of the moving knife, referring to '3.-(3) Adjusting the height of the thread separating claw of the moving knife.'
General| Max Stitch Length | 5 mm |
|---|---|
| Needle System | DB x 1 |
| Foot Lift | Manual |
| Lubrication system | Automatic |
| Max. sewing speed | 1, 500 sti/min |
Instructions for setting up the sewing machine on a table, including securing it with screws.
Detailed steps for applying oil and grease to various machine parts for proper function.
Procedure for inserting and securing the needle into the needle bar for sewing.
Steps to attach the protective cover for the needle bar assembly.
How to install the tray that holds buttons during the sewing process.
Guide on how to thread the sewing machine, following a specific sequence of points.
Adjusting the tension of the thread for sewing buttons, with two tension posts described.
Adjusting the thread pull-off lever's position to ensure proper thread feeding during sewing.
Setting the correct clearance for the tension lever and thread guide for smooth thread flow.
Adjusting the nipper and its block to prevent incorrect thread holding during operation.
Adjusting the thread tension guide on the face plate to reduce thread tension if needed.
Aligning the needle and looper correctly for proper stitch formation and thread engagement.
Setting the correct clearance between the needle guide and the needle.
Adjusting the height of the button clamp unit relative to the feed plate.
Adjusting the work pressing force by setting the distance between nut and pressure bar.
Setting the button clamp stop lever for easy insertion and removal of buttons.
Adjusting the timing of the tension discs releasing the thread during sewing.
Procedures for setting the machine for sewing 2-hole or 4-hole buttons.
Steps to change the number of stitches for button sewing.
Adjusting the stop-motion mechanism to ensure the machine stops correctly after sewing.
Adjusting the position of the moving knife for the automatic thread trimmer.
Ensuring proper clearance between the button clamp lifting lever and the adjusting screw.
Instructions for correctly setting the L-shaped lifting rod for machine operation.
Adjustments for the knot-tying mechanisms, including connecting plate and stopper.
Instructions for connecting the belt and its metal fittings to the machine.
Information about different subclass models of the sewing machine.
Installing and operating attachments for shank buttons (Pearl buttons).
Installing and adjusting the attachment for the first process of wrapped-around buttons.
Installing and adjusting the attachment for the second process of wrapped-around buttons.
Installing and adjusting the attachment for snaps.
Common causes and corrective measures for thread breakage during sewing.
Troubleshooting issues when the machine forms a seam after running briefly.
Identifying causes and solutions when buttons are not sewn tightly.
Addressing issues where the last back-tack stitch has poor tension.
Troubleshooting long thread trails from the button's right side on the first stitch.
Corrective actions for failures in the thread trimming mechanism.
Resolving issues where the needle thread is cut in two places on the fabric's wrong side.
Correcting problems with long button threads remaining after trimming.
Addressing variations in remaining thread length after trimming on the wrong side.
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