Claims
- 1. An apparatus for finishing a commutator blank having a plurality of commutator bars supported by and around a commutator sleeve molded of a thermosetting synthetic resin, the commutator bars being circumferentially spaced by and electrically insulated from one another by grooves formed in an outer peripheral surface of the commutator blank and defined between adjacent ones of the commutator bars and an outer peripheral surface of the commutator sleeve, said apparatus comprising:
- a power-driven clamp unit for rotatably supporting the commutator blank;
- means for filling the grooves in the commutator blank with a sublimable material as the commutator blank is being rotated by said power driven clamp unit, said filling means including means positioned above the commutator blank for applying the sublimable material in the molten liquid state to the outer peripheral surface of the commutator blank, and a preheating element slidably engageable with the outer peripheral surface of the commutator blank being rotated to heat the commutator blank at a temperature above the melting point of said sublimable material for enabling the molten sublimable material to retain its flowability and flow smoothly into the grooves in the outer peripheral surface to fill the grooves, and retractable means disposed at a position opposed to said means for applying the sublimable material to the commutator blank, said retractable means driving the preheating element retractably from the surface of the commutator blank, said preheating element being disposed below the commutator blank at a location opposite said means for applying the sublimable material to the commutator blank; and
- means for cutting the outer peripheral surface of the commutator blank after the grooves of the commutator blanks are filled with the sublimable material.
- 2. The apparatus according to claim 1, wherein said applying means includes a dispenser having a nozzle disposed directly above said preheating element, said preheating element comprising a preheating iron having a substantially semicircular recess receptive of the commutator blank and complementary in contour to the shape of the outer peripheral surface of the commutator blank.
- 3. An apparatus for finishing a commutator blank having a plurality of commutator bars supported by and around a commutator sleeve molded of a thermosetting synthetic resin, the commutator bars being circumferentially spaced by and electrically insulated from one another by grooves formed in an outer peripheral surface of the commutator blank and defined between adjacent ones of the commutator bars and an outer peripheral surface of the commutator sleeve, said apparatus comprising:
- a power-driven clamp unit for rotatably supporting the commutator blank;
- means for filling the grooves in the commutator blank with a sublimable material as the commutator blank is being rotated by said power driven clamp unit, said filling means including means for applying the sublimable material in the molten liquid state to the outer peripheral surface of the commutator blank, and a preheating element slidably engageable with the outer peripheral surface of the commutator blank being rotated to heat the commutator blank at a temperature above the melting point of said sublimable material for enabling the molten sublimable material to retain its flowability and flow smoothly into the grooves in the outer peripheral surface to fill the grooves, said preheating element being retractable from the outer peripheral surface of the commutator blank for causing the sublimable material to cool down and set its shape in the grooves, said applying means including a bath for holding the sublimable material in the molten state, and a ladle for dipping out the molten sublimable material from said bath onto the outer peripheral surface of the commutator blank, said preheating element comprising a preheating iron disposed above said ladle; and
- means for cutting the outer peripheral surface of the commutator blank after the grooves of the commutator blanks are filled with the sublimable material.
- 4. An apparatus for finishing a commutator blank having a plurality of commutator bars supported by and around a commutator sleeve molded of a thermosetting synthetic resin, the commutator bars being circumferentially spaced by and electrically insulated from one another by grooves formed in an outer peripheral surface of the commutator blank and said grooves being defined between adjacent ones of the commutator bars and an outer peripheral surface of the commutator sleeve, said apparatus comprising:
- a power-driven clamp unit for rotatably supporting the commutator blank;
- means for filling the grooves in the commutator blank with a sublimable material as the commutator blank is being rotated by said power-driven clamp unit, said filling means including an applying means having a dispenser positioned above the commutator blank for applying the sublimable material in the molten liquid state to the other peripheral surface of the commutator blank, and a preheating element positioned below the commutator blank at a location opposite said applying means, said preheating element comprising a preheating iron having a substantially semicircular recess receptive of the commutator blank and complementary in contour to the shape of the outer peripheral surface of the commutator blank, said preheating element being slidably engageable with the other peripheral surface of the commutator blank being rotated to heat the commutator blank at a temperature above the melting point of said sublimable material for enabling the molten sublimable material to retain its flowability and flow smoothly into the grooves in the outer peripheral surface to fill the grooves, and retractable means disposed below the commutator blank, said retractable means retractably driving the preheating element from the surface of the commutator blank; and
- means for cutting the outer peripheral surface of the commutator blank after the grooves of the commutator blanks are filled with the sublimable material.
Priority Claims (2)
Number |
Date |
Country |
Kind |
62-98580 |
Apr 1987 |
JPX |
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62-98581 |
Apr 1987 |
JPX |
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Parent Case Info
This application is a continuation of application Ser. No. 379,964, filed Jul. 14, 1989 and now abandoned, which is a divisional of application Ser. No. 07/184,123, filed Apr. 20, 1988 now U.S. Pat. No. 4,862,575.
US Referenced Citations (7)
Foreign Referenced Citations (2)
Number |
Date |
Country |
2399907 |
Apr 1979 |
FRX |
132505 |
Apr 1985 |
JPX |
Divisions (1)
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Number |
Date |
Country |
Parent |
184123 |
Apr 1988 |
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Continuations (1)
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Number |
Date |
Country |
Parent |
379964 |
Jul 1989 |
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