| 摘要 |
Electrical insulators are formed from insulative strip material by providing a substantially continuous ultrasonically welded seam. In one embodiment a tubular insulator for covering stator winding connections is formed by continuously moving the strip and a strip of dissimilar material about a cylindrical former having its axis in generally the same direction as the direction of elongation and motion of the strips to thereby form a multiple layer sleeve with a seam being ultrasonically formed to include the two edges of the strip of polyester material. In a second embodiment two or more parallel elongated narrow flat strips are moved in their direction of elongation with a plurality of flat sheets of polyester material being ultrasonically bonded thereto along a substantially continuous seam on the individual sheets with the individual sheets occurring at uniform intervals along the strips to thereby form a ladder-like strip of insulators. In both embodiments the strip is periodically severed after bonding to form individual insulators. In the case of the second embodiment this severing occurs along a line substantially perpendicular to the direction of elongation of the strips, and in a manner to separate the flat sheets into two approximately equal pieces to thereby form phase insulators for stator windings. Substantially continuous ultrasonically formed seams are achieved with surprisingly little tool wear. Tools are case hardened at least along the surface engaging portions or welding tips thereof. Relatively continuous welded seams are achieved by providing ultrasonic vibrations to the tool tip.
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