Bobbin cores for sideless pre-wound sewing thread bobbins and methods of winding the same
AssigneeFil-Tec
InventorVincent E. Schoeck
Life of this patent
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Abstract
Cylindrical bobbin cores have at least one radially oriented slot formed in at least one end thereof. The slot is sized and configured to mate with a radially extending blade associated with the drive head of the winder so as to achieve positive rotational drive therebetween. In view of this interconnection between the core and the drive head, significantly less spring pressure needs to be exerted against the core by the tail stock of the winder.
Claims9
A pre-wound flangeless, sideless bobbin comprising a cylindrical bobbin core, and a continuous length thread wound about said core, wherein said core is permanently magnetized, and includes at least one radially oriented slot at one end thereof.
A method of making a flangeless, sideless pre-wound bobbin by winding a continuous length of thread about a bobbin core comprising:
- (a) positioning a flangeless, sideless bobbin core which is permanently magnetized and includes at least one radially extending notch between a terminal end of a drive head and a spring-biased tail stock associated with a thread winder;
- (b) causing a radially oriented blade fixed to the terminal end of the drive head to be seated within the slot;
- and then
- (c) rotating the drive head to cause the blade seated within the slot to positively rotationally drive the core to wind a sufficient amount of the thread about the core, thereby forming the bobbin.
Dependencies are inferred from the claim text.