If needle is not bent and fully inserted, likely timing has slipped.
Try a new needle and be sure it is fully seated. Clean bobbin and hook race area per instructions in manual.
https://www.janome.com/siteassets/support/manuals/economy-models/inst-book-7318-english.pdf
SOURCE: Needle & Bobbin out of sync
This description sounds like the machine is out of time. The needle should match up with a cut out section in the bottom of the bobbin area. If it is hitting, the timing has slipped, probably from sewing on a fabric that was too heavy for the machine.
SOURCE: Picking up the bobbin thread
A few suggestions:
If the basic cleaning and re-threading (above) don't help, your machine(s) may be out of time or have another mechanical issue that will require a repair technician. We recommend a tech trained on your specific brands - they'll be better trained and able to get any repair parts that may be needed.
Hope this helps narrow down your stitching problems.
Happy sewing,
Kim & Linnette
SOURCE: will not pick up bobbin thread
Unusual for this machine. Check to be sure the needle is inserted with the flat side to the back of the machine. If it is, remove the needle plate, bobbin and bobbin case. Turn the hand wheel slowly toward you and see if the point of the hook is above or below the eye of the needle when the hook point is aligned behind the needle. If the eye is above the point of the hook the machine is out of time and best taken to qualified technician.
SOURCE: needle not picking up bottom thread
Remove the needle plate and the bobbin case.
Ensure that the needle is inserted all the way up into the needle clamp.
Set the machine for straight stitch, center needle position.
Slowly turn the handwheel in the normal sewing direction and observe the following hook timing setting:
When the needle reaches it's lowest point and travels up 3.5mm, the point of the hook should be directly behind the needle, or at least within 1 or 2mm.
Another view is as the hook passes the needle, it should pass the needle slightly above the eye of the needle.
If the timing looks good, use some alcohol on a bit of cloth to clean the hook, careful around the tip of the hook as it is very sharp.
If the hook timing is off, you will need to take it to a knowledgeable service person as there are several possible solutions and several other related adjustments which will need to be made.
SOURCE: needle hits bobbin case...
If the needle hits the bobbin case the are only 2 things that could be wrong. Lets hope its the easy one, there are more than one length of needles, if the needle is to long or it is not all the way up in the neelde bar, the needle will hit the inside of the bobbin case. Now if that is not the problem then the machine is out of time. ALWAYS check the easy stuff FIRST.
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