Video on how to use model 1740

Hello, Jerry -

I doubt the kind of thread and pre-wound bobbins you use with your Janome MB4 sewing machine are the problem with the thread tangles and loops on the bottom and top of the items you are working on are the problem. Robinson Anton threads appear to be rated as high quality.

I suspect the problems are caused by the tensions for the top and bottom threads and / or how the bobbin is inserted in the bobbin holder. It is an embroidery sewing machine, is it not?

From the user manual for your model of machine:
https://www.janome.com/siteassets/support/manuals/embroidery-models/inst-book-mb-4en.pdf
on Page 81 (PDF image 84), the problem of the thread looping (last Troubleshooting issue on the page) may be caused by
- Needle thread tension too loose
- Bobbin not inserted properly
- Poor quality thread used (Note: I don't think that is the issue for you.)

I found a series of YouTube videos about the Janome MB4 machine, which may prove instructive. This is the link to the Part 1 video:
https://www.youtube.com/watch?v=8VL-ikUr3tQ
In the right sidebar of that page, you will see links to the first parts of the video series. As you choose subsequent parts of the video series, you will see additional links to other parts of the video series in the right sidebar.

I also found a longer video tutorial on YouTube for the Janome MB4:
https://www.youtube.com/watch?v=X_RJ8-kY5_o
The sections of the video on inserting the bobbin (starting at about minute 14:18) and threading the machine (starting at about minute 15:17) may be helpful.

If, after making sure you know how to insert the bobbin properly in the machine and after threading the machine properly and setting the tension for each needle, you still experience thread nesting, I suggest you locate a nearby authorized Janome sewing machine service center and pay to have the machine evaluated and adjusted so that it works properly.

Best wishes.

Sounds like there is fuzz trapped somewhere around the bobbin or race. That often happens when you clean a machine. You may need to take the face plate off and gently remove thread or fabric that might be hung inside. Look carefully in and around the bobbin and race and gently remove any debris you find.Count to 10 and grin.

try a new needle--make sure it's the right needle for the fabric
being sewed.
try rethreading the machine top and bobbin --make sure to use
every thread guide
try a different bobbin
it's also possible that the machine could have a timing problem
and needs to be checked

here's a free manual if you need one just click on the link

http://www.singerco.com/uploads/download/f3eff19dd0b1966512ad6a6bd24e3d8a74926fca.pdf

try using a new needle
try a different bobbin just incase there is something wrong with the
that one.
make sure the bobbin winds the thread evenly on the bobbin
make sure the bobbin is inserted correctly into the bobbin case
what is the name and model number of the machine and I will see if
I can find you a manual

try changing the needle
try rethreading the machine top & make sure to use
every thread guide
make sure the bobbin is turned the right way in the bobbin case
it's also possible that the machine may need to be checked to see
if there is a timing problem

make sure the presser foot is at it's hightest position, then thread the top
of the machine
change the needle
make sure the bobbin is not over full
that it is turned the right way in the bobbin case
if none of these suggestions work,,it is also possible that the machne is
out of time & needs to be checked at a repair shop

here's a link for a manual
http://www.bernina.com/getdoc/4a3fb7af-a8d3-488a-a76a-0147415042a7/Bernette_50_60_70_75_manual

try singer for a manual
Go to the singer website
Go to the home page
Go to customer service--click on it--it will show a small menu--click on instruction manual
In the box put the model number (example w1740 ) & click search
if search comes up with nothing contact singer customer service
or try
sewingpartsonline.com
sew4less.com
sewusa.com
it should take a regular bobbin

Are following these instructions? http://www.sewusa.com/Threading_Diagrams/Threading_Pages/Singer_Sewing_Machine_Threading/singer_401_threading_diagram.htm

Note: always thread a sewing machine with the presser foot up and make sure the bobbin thread is feeding from the bobbin as indicated in the manual.

Tension is usually around 4.

You need the right bobbin for this model: Class 66.

TRY THIS, itma not be your model, but should help Title:
How do I wind the bobbin?
Pre-tension disk Bobbin winder shaft Bobbin

1. Pull up the spool pin as far as possible, and then put a spool of thread on this pin.
2. Pass the thread around the pre-tension disk. Make sure that the thread passes under the pre- tension disk.
Pre-tension disk Pulling it in as far as possible

Caution If the spool of thread is not in the right place, the thread may tangle on the spool pin.

3. Pass the end of the thread through the hole on the bobbin from the inside of the bobbin.
4. Put the bobbin onto the bobbin winder shaft and slide the bobbin winder shaft to the right.
5. Turn the bobbin clockwise, by hand, until the spring on the shaft slides into the groove of the bobbin. Spring on the shaft Groove of the bobbin

6. Turn on the sewing machine.
7. While holding the end of the thread, gently press the foot controller or press start/ stop button (for models equipped with the start/stop button) to wind the thread around the bobbin a few times. Then stop the machine.
Note

• If the sewing machine is to be operated using the foot controller, connect the foot controller before turning on the machine.
• When the foot controller is plugged in, the start/stop button cannot be used to start sewing (only for models equipped with the start/stop button).

8. Trim the excess thread above the bobbin.
Caution Make sure you follow the instructions carefully.
If you do not cut the thread completely, and the bobbin is wound, when the thread runs low it may tangle around the bobbin and cause the needle to break.

9. Slide the sewing speed controller to the right (to set the speed to fast).
(For models equipped with the sewing speed controller.) Sewing speed controller
10. Press the foot controller or press start/stop button (for models equipped with the start/stop button) to start.
11. When the bobbin seems full and begins spinning slowly, take your foot off the foot controller or press start/stop button (for models equipped with the start/stop button).
12. Cut the thread, slide the bobbin winder shaft to the left and remove the bobbin.
13. Slide the sewing speed controller back to its original position (for models equipped with the sewing speed controller).


Caution Not winding the bobbin properly may cause the thread tension to loosen, and may break the needle.
Wound evenly Wound poorly


Note

• When the sewing machine is started or the handwheel is turned after winding the thread around the bobbin, the machine will make a clicking sound; this is not a malfunction.
• The needle bar does not move when you slide the bobbin winding shaft to the right.

Take the thread out of the top and bottom and turn the handwheel by hand to see if the machine will rotate smoothly.
Rethread, making sure that the thread is in the bobbin tension slot and that the upper thread is in the tension and the take up lever.

Sorry for the delay in response. I just found the sight this evening.