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I have a Bernina 740 semi-industrial sewing machine that looks slightly different (has an extra tensioning loop on front) than the manual I have located online for the 740 models. Can anyone tell me what this extra loop is for and how it threads as it does not seem to make sense or stay threaded when I thread my machine. Is there another manual for this model at all?

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Posted on Jan 02, 2017

  • 8 Answers

SOURCE: bobbin tension

Bobbin Tension Adjustment:

1. Do you have a genuine Bernina bobbin casing and not an Oriental copy? If yes, proceed as follows:
2. To set the bobbin tension, wind a genuine Bernina bobbin with Metrosene thread, type 1161 white thread as your "gaging thread". Load the bobbin case so that the bobbin turns CW. Attach the bobbin case to the hook body from the machine. Wind a couple of revolutions of thread around your index finger with the assembled bobbin case and hook body dangling about 6" to 12" below your finger. Gently and rapidly move your finger back and forth in a "sideways" motion about 1/4" to create a gentle vibration on the bobbin assembly. (Do not shake the bobbin assembly up and down). When the tension is right, the bobbin assembly should fall slowly and as you stop the movement, the assembly should stop.
The adjustment is found on the small screw, holding the flat tension spring against the bobbin case. If the tension is too tight, one must loosen the screw (past) the desired location and always make the adjustment by tightening to the correct position.

There are other checks for tension imbalance and associated problems on the bobbin case that I won't go into here. For further information I can help you later on.

Top Tension Adjustment:

1. The top tension rarely changes and can be depended on throughout the life of that machine providing that tension assembly is maintained occasionally. This can be done by blowing out the tension disks with the presser bar lever in the up position. One can also drag or pull a piece of sized percale or muslin through the disks with the presser bar lever in a down position. Perhaps both methods can be employed.
2. Load the top of the machine with Metrosene 1161 thread in a dissimilar color. I prefer to use a pastel color so as not to create an optical illusion of imbalanced tension.
3. Sew a satin stitch (.25 on the Nova 900) in sized cotton muslin with a thin piece of paper between two plys of fabric. The width should not exceed 4.5mm (standard width on the 900 Nova), however the newer machines have wider stitch widths so one must adjust as specified. The result will be a slight amount of top thread in symmetric lines on both the right and left sides of the satin stitch.

Typically, the top tension will not need adjusting. If the Nova 900 needs adjustment, please ask for additional help.

Posted on Nov 28, 2008

  • 323 Answers

SOURCE: threading lower bobbin

There are some different bobbin cases for different machines but the one you have is a pretty common one with a finger sticking out on top. If you examine the bobbin case you will see a slot on the side of it and there is another piece of metal screwed onto it. This is the tension they are describing.
To thread it properly, turn the bobbincase upside down and insert the bobbin in the case so you can see it. Place your thumb on top of the bobbin and pull the thread through the slot on the side of the case and under the piece of metal(the lower tension) which I described to you earlier.. When you have done that, remove your thumb from the bobbin and pull on the thread. It should have some tension on it.
Next,placing a thumb or finger on the bobbin to keep it from falling out, turn the bobbin case over.
Keeping the finger sticking up lift the lever on the
front of the case and insert the bobbin and bobbin case onto the spindle inside the hook assembly(The part that is in the bottom of the machine that turns when the hand wheel is turned.) Don't worry about the thread that is sticking out.
Holding the upper thread under the presser foot ,turn the handwheel towards you until the top thread pulls the lower thread to the top. Pull the thread to the left of the machine, insert your fabric, lower the presser foot and begin sewing
One more thing , The finger sticking up on the bobbin case will go into a slot on the ring holding the hook inside the machine.
Hope this solves your problem.
Be sure you thread the upper part properly. It should go through the tension, then the take up lever and then the needle. Tension should be set at around 5
sewman7

Posted on Jan 17, 2009

louislevel_2
  • 374 Answers

SOURCE: Thread loops

Proper set of bobbins and tension set up vs. fabrics will sew you satified.Also incude regular maintenance cleaning of the feeds dogs with a brus,also the shuttle assembly need sometime to clean.Some threads and fabrics chips accumulates in the feed dogs and shuttles assembly.In setting up thread bobbins the thread should be clockwise direction as you pull out on slot coming out to the bobbins (as you shown in my inserted image manual).The loop thread should be propely in the sequence position same like in the image refer to it.If you use cotton/ polyester fabric in the begining of trial set tension dial to No.3 and stich to No. 8 to 12 any convenient to you Use needle No. 14 .Posible make a record if you are sewing different types of fabric mostly silk fabric is hard to sew adjusting to lower stich can posible sew satisfactory.

Posted on Mar 10, 2009

Mimito7
  • 128 Answers

SOURCE: Top thread stitches correctly but bottom thread loops.

FYI---- Loops on the bottom-- problem is in the threading..
Loops on the top--- problem is with the bobbin.

Posted on Apr 19, 2009

  • 30 Answers

SOURCE: How do you thread a bernina 1008?

I hope I can explain this in an understandable way!

1. Pull the end of the thread from the spool to the left and "click" it into the little metal guide (on the top of the machine) that is at the back of the long **** in the top. It's easiest to do this by holding the thread tight between your two hands, placing it behind the guide, and pulling forward until it clicks in.

2. for the remaining steps, let the thrread slide between the fingers of your right hand, keeping a little tension on it, as you thread the machine with your left hand.

3. Bring the thread end forward, laying the thread into the ****, and continue downward, along the right side of the vertical silver bar/hook thingy.

4. Bring the thread under that bar from right to left, and go back up towards the top of the wide **** in the front of the machine. As you pull up, the thread will click into the lower bar/hook thingy.

5. Lay the thread along the right side of the wide ****, go over the top of the needle bar (the part that goes up and down in the ****) and bring it down the left side. It will click into the needle bar.

6. Bring the thread back down towards the presser foot. Right in front of the screw that holds the foot on, there is a hook that opens on the left side. Slide the thread behind this hook, and then thread the needle from front to back.

7. Hold onto the end of the thread and run the needle down and back up once. Pull on the thread, and it will pull up a loop of the bobbin thread. Stick the tip of your scissors or seam ripper into the loop and pull the end of the bobbin thread out.

8. Slide your top thread through the slot in the presser foot so it comes out from underneath the foot, and you're ready to go! (Be sure and hold onto both threads for the first few stitches when you start a seam, to keep if from jamming up inside.)

Let me know if you need any clarification.

Posted on Jun 21, 2009

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