The fabric to be gathered is positioned underneath the Gathering Attachment, whilst the fabric that remains flat passes over it. The fabric is gathered by differential feed at the same time as it is sewn onto the flat fabric.
Further Information
https://www.bernina.com/BERNINA/media/Support/Accessories/Accessories_for_Overlockers/Gathering_foot_%23_C18/EN/1038425_00A_04_web_manual_-C18_2019-11_EN.pdf
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