Assuming it is a 730 Record (vintage model) Not the new computerized model...
At the very right bottom front of the machine, there is a dial. Rotate one direction it drops the feed dogs for darning/free motion quilting, rotate the other direction the feed dogs will raise once stitching begins.
Here's a manual to download: BERNINA Support Machine and Accessories Finders and Software Support...
Here is a manual for the Bernina 730 Artista (computerized model):
Answers & Comments
Assuming it is a 730 Record (vintage model) Not the new computerized model...
At the very right bottom front of the machine, there is a dial. Rotate one direction it drops the feed dogs for darning/free motion quilting, rotate the other direction the feed dogs will raise once stitching begins.
Here's a manual to download:
BERNINA Support Machine and Accessories Finders and Software Support...
Here is a manual for the Bernina 730 Artista (computerized model):
http://www.bernina.com/en-US/Support-US/Machines/BERNINA-artista/BERNINA-artista-730
...
Try these links
BERNINA artista 730 Support BERNINA
Bernina 730 Record Parts
Bernina 730 Sewing Machine Cleaning oiling and Maintenance