Horizontal compartmentized square bobbin of high-voltage transformer

A high-voltage transformer winding bobbin made from a heat-resisting, insulative plastic material through the process of injection molding having a plurality of square flanges equidistantly spaced around a hollow, cylindrical, square in cross section core and a plurality of winding grooves respectively defined between each adjacent pair square flanges for winding an enamel wire, said square flanges including a stop flange at one end and a plurality of wire guiding flanges, each of said wire guiding flanges having each a V-shaped wire guiding notch on a respective peripheral edge each notch extending to a depth of and aligned with a corner of said core and having a first side contained in a plane disposed at a first angle to the horizontal and a second side contained in a plane disposed perpendicular to the plane containing the diagonal of said core passing through said corner and a diagonal corner.