Patent ID: 6659384
Filing Date: 2003-12-09
Classification: B65H,D05B,D05D

Abstract:
A pre-wound bobbin for removably mounting in a steel bobbin case formed as a generally cup-shaped housing having an end wall at one end thereof and being open at the other end thereof and having a post mounted on the end wall, the pre-wound bobbin comprising:a hollow cylindrical core for fitting over the post of the bobbin case such that the core rotates freely relative to the post; a continuous length of thread wound onto the core; and a flange comprising a flexible sheet magnet attached to one end of the core and extending radially outwardly therefrom, the flange exerting a magnetic attraction force on the end wall of the bobbin case when the bobbin is mounted therein with the flange in contact with the end wall, the flange being configured to provide sufficient contact area with the end wall of the bobbin case and having a magnetic strength of sufficient magnitude such that said magnetic attraction force exceeds the weight of the pre-wound bobbin yet allows the bobbin to be rotated on the post by pulling the thread tangentially away from the bobbin.