Hi, Chances are good that you need to have your foot controller repaired. The electrical contacts inside the foot control can either get dirty/dusty or worn out. If it is not an electrical problem, like your foot control ( and I think it is) then it is a mechanical problem inside your machine. If it is mechanical and your machine is "binding up" , when it slows you would find it hard to turn the hand wheel located on the end of your 180. One other possibility is that the brushes in your machines motor are worn out and you need to have the motor replaced. All three problems would require professional help as there are not any user serviceable parts on your machine. A good cleaning and servicing at a Bernina dealer should get you back on track. Good luck, bushvideo
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it could be pedal control or the speed control unit on the motor as it is reasonably common for that machine
take it in for a service to ensure that other factors ( thread around bobbin shaft, fluff etc is not slowing the machine
Have you cleaned and oiled it recently? If it is mechanical (NOT computerized), it needs to be cleaned and oiled regularly to keep it working properly. In your case, the needle bar movement is probably stuck. Consult the owner's manual in the Maintenance section, use only good quality sewing machine oil (fresh, not old stale oil), apply 1-2 drops each place indicated in the instructions. To speed things up, you can direct hot air from a handheld hairdryer into the area.
In the future, clean and oil every time you change a bobbin, every 8 hours of constant sewing, or every 6 months if not in regular use.
unless it has been progressively getting slower, I did have a simular issue. My pedal was getting "stuck" at the 1/2 mark. (wasn't pressing all the way down). Drove me nuts. Took the machine apart, cleaned oiled, cleaned again blah blah blah...when the pedal was the last option took it apart and found a nut from a screw had gotten inside the pedal and stopping it from pressed down. There could be a burr, a nick or something it is catching on.
make sure the bobbin is not warped or damaged also make sure the bobbin fits securely in the bobbin case does the bobbin case fit securely in the machine? the bobbin case could be getting old & might need to be replaced.
Try the process of elimination. Take out the needle, take off the needle plate, take out the bobbin case. Run the machine. Does if run full speed? You might have to let the machine run for about 5 minutes. If it runs slow or you hear it slow down, you might have a bad connecting link between the needle bar and the main shaft counter weight. They seize up sometimes. (Shop Repair).
TRY THIS, itma not be your model, but should help
Title: How do I wind the bobbin?
Pre-tension disk Bobbin winder shaft Bobbin
Pull up the spool pin as far as possible, and then put a spool of thread on this pin.
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
If the spool of thread is not in the right place, the thread may tangle on the spool pin.
Pass the end of the thread through the hole on the bobbin from the inside of the bobbin.
Put the bobbin onto the bobbin winder shaft and slide the bobbin winder shaft to the right.
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
Turn on the sewing machine.
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.
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).
Trim the excess thread above the bobbin.
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.
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
Press the foot controller or press start/stop button (for models equipped with the start/stop button) to start.
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).
Cut the thread, slide the bobbin winder shaft to the left and remove the bobbin.
Slide the sewing speed controller back to its original position (for models equipped with the sewing speed controller).
Not winding the bobbin properly may cause the thread tension to loosen, and may break the needle.
Wound evenly Wound poorly
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.