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Thread Tensions – All Machines
6.
Check Springs
!" What are they for?
To help keep the slackness out of the thread as the take-up lever is moving into position
to tighten the stitch.
!" When do you adjust them?
Looping problems, or for thread that may slip off the main rotary tension disk.
!" How do you adjust them?
With the thread off of the check spring, use a flat tip
screwdriver to turn the black screw inside the main
tension control knob counterclockwise (loosen) until
the check spring comes off of the silver metal stop
plate along the left side of the main control knob.
Then turn the screw clockwise (tighten) until the
spring just touches the stop plate, and continue
turning approximately 1/8 to 1/4 turns, further
clockwise (tighten). This would be the normal
position of the check spring. If you have a looping problem that could not be solved by
any other means, the silver stop plate could be adjusted by loosening the phillips screw
above main tension control knob and rotating the silver stop plate clockwise until the
space on the right side of the phillips screw looked to be larger than space on the left.
This would mean that the check spring will have to travel further to get to the stop plate,
make sure the check spring is readjusted to match as described above.
7.
Thread Path
!" What is it for?
The thread path lines the thread up for proper functions of all mechanisms in the thread
path and is also another form of thread tension, and thread tension problems.
!" When do you check it?
If the machine was sewing correctly and you just started having a problem on a needle.
!" How do you adjust it?
Remove the thread completely out of thread path. Rethread completely, and as you are
threading it, keep pulling on it as you go through the eyelets and other guides to see if
tension has changed dramatically. If at any point you feel a difference in tension, look at
that area just threaded closely. You may have to use some fine abrasive cord, through the
eyelet or around the wheel to polish up the area having the problem. The take-up lever
eyelet is one of the main areas of thread guide tension problems. The surface of the eyelet
may be come tarnished from metallic thread or the environment, causing a dramatic
increase in tension. Try the abrasive cord here or even some silicone spray in the eyelet.
Make sure that the thread is wrapped two turns clockwise around thread break sensor
wheel. It can be wrapped more if a technician feels it would help. It should also flow
smoothly as it comes off the wheel. When the thread is going around the main rotary
tension disk, the thread should be wrapped around the groove of the disk one and one half
turns clockwise. If the metal disk does not rotate smoothly during the sew off, remove it,
and clean the metal wheel, sometimes placing a little bit of baby powder on the three
pieces of felt helps.
For Technical Assistance Please Call Toll Free 1-877-4BROTHER
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