JPS5466407A - Commutator - Google Patents

Abstract

PURPOSE: To facilitate a fabrication of the commutator for small sized motor, by such method that with a plurality of tips radially made extending in the periphery of base part by punching a plate, and a commutator segment and reiser formed by bending the above, the base be cut and removed after a molding processing with an insulating unit.

CONSTITUTION: With a commutator segment base material plate 1 processed punching work, a plurality of segments 2, numberig the same quantity of segments as prescribed with an equal width, will be radially constructed from the periphery of a ring-shape base part 4, with a process of bending made in two stages at a position where a distance from center is almost in the same length as outside diameter of the ring-shape base part 4. A bent part at an opposite side to the base part 4 is formed in its outside diameter larger than that of the bae part 4 making a tube- shape part with a slit 6 provided between each segment 2, simultaneously with a near around part to each end of the segment 2 radially bent to form a commutator segment 8 having a riser 7. Subsequently, with a bent base part of the riser 7 in the commutator segment 8 and the tube- shape part of the ring-shape base part 4, including the slit, made remaining, after processing a molding of insulating unit 9 so as to coat within the tube-shape part, the ring-shape base part 4 is cut and removed to separate the segment 2. In this way, with a work, eliminated, for processing the slit after molding, the work process can be widely abbreviated.

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