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Troubleshoot this. Here are some steps you can take:
Safety Setting Adjustment:
In newer firmware versions (V9.xx), a safety sewing setting was added to prevent the ruler foot from hitting the needle holder when the foot is hovering and the needle is down.
If your presser foot only raises slightly (about 2mm), it might be due to this safety setting.
To resolve this, change the setting from the maximum of 2mm to a maximum of 6mm.
Remember to switch it back to the original setting when using the ruler foot.
Check the Needle Position:
Ensure that the needle is in the highest position (raised) before attempting to move the presser foot.
If the needle is down, the presser foot may not move freely.
Inspect for Obstructions:
Examine the area around the presser foot for any obstructions, tangled threads, or debris.
Make sure there's nothing preventing the presser foot from moving smoothly.
Presser Foot Pressure Adjustment:
Uneven fabric feed can occur if the pressure on the presser foot is too high or too low.
Adjust the presser foot pressure according to the thickness of the fabric you're working with.
Power Cycle and Reconnect:
Turn off the machine and disconnect it from the power source.
Reconnect it and power it back on.
Refer to the Manual:
Consult your Bernina Bernette 715 user manual for specific troubleshooting steps related to the presser foot. If these steps don't resolve the problem, you may have to take it to a professional repair service.
It is an old machine and possibly the presser foot has became rusted. This can be repaired if it isn't too bad but you might want to find another one to replace it just to make it easy.
You need a special foot for free motion quilting--it is slightly shorter in height than a regular presser foot, which essentially provides space between the presser foot and the needle plate to manually move the fabric. Sometimes machines came with a standard darning foot accessory. Your Pfaff dealer probably has at least one style in stock. But there are other specialty feet you can probably use, ie Big Foot, clear free motion foot, C-shaped, oval, etc. You can also purchase a shank adapter (verify it is the correct shank for your machine) and use it with a kit of snap-on presser feet so you can have a variety of presser feet for different functions.
Check the feed dogs are in the right spot, when they move they should be just above the needle plate. If they aren't then your feed dogs are disengaged and you need to push the button or leaver that re-engages them. If the feed dogs are in the right place then you may have the wrong presser foot on the machine and will need to change the presser foot to one with a slightly longer shank.
The presser bar may be stuck and may need some WD40 on the top so it seeps down the needle bar, or the presser foot dial or adjuster is set to 0, or the presser bar spring has broken, or the block and screw on the presser bar where the lever is has come loose.
This may be a lubrication problem on the presser foot shaft. Try freeing up with penetrating oil or Triflow. After letting set for an hour lower the presser foot and pull down on the ankle. If that does not work you need to open the machine and loosen the clamp screw on the presser foot shaft. Then try to twist the shaft to loosen it up.
This machine has a tension roller system that meters out thread when the machine is running. When stopped it is locked up so you won't be able to pull thread thru with the foot down. Hope this helps.
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