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US 2003/0213779 A1Published application
Device for welding nut or the like
AssigneeSMK Corporation
InventorMasato Hidaka
Life of this patent
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AssigneeSMK Corporation
InventorMasato Hidaka
Estimating the term…
The present invention relates to a nut positioning pin disposed on a lower electrode for the projection welding of a nut. The present invention increases cooling and positioning accuracy, prevents entrance of sputtering particles, and increases the detecting accuracy. The present invention comprises an electrode holder (2) of a double-tube structure having a cooling water passage, a guide ring (13) for guiding a coupling rod (7) for vertical movement, an air passage (m) for preventing the entrance of sputtering particles, a coupling block (28) and a magnetic shield, which comprises a magnetic member for preventing a magnetic detecting element from being affected by an external magnetic field. The present invention accurately guides cooling water and the coupling rod in the electrode holder and prevents sputtering particles from entering the electrode holder, and prevents a detector from being adversely influenced by an external magnetic field for increased detecting accuracy.
An device for welding a nut or the like, comprising an electrode holder of a double-tube structure having an inner tube and an outer tube which are fitted together with a cooling water passage defined in a gap therebetween, a lower electrode coupled to an upper end of the electrode holder and having a through hole defined centrally therein, an air cylinder coupled to a lower end of said electrode holder, a coupling rod disposed in the tubes of said electrode holder and vertically movable when said air cylinder is operated, a positioning pin disposed on an upper portion of the coupling rod and having a tip end movable into and out of the through hole in said lower electrode when the coupling rod is vertically moved, and an air blowing mechanism for delivering air into the inner tube from a lower portion of said electrode holder, characterized in that a detector for detecting a projected position of said positioning pin is mounted on said air cylinder, a guide ring for guiding said coupling rod for vertical movement is disposed on an upper portion of the inner tube of said electrode holder, and air passage means for passing air delivered from said air blowing mechanism upwardly is defined in said coupling rod.
An device for welding a nut or the like, comprising a tubular electrode holder, a lower electrode coupled to an upper end of the electrode holder and having a through hole defined centrally therein, an air cylinder coupled to a lower end of said electrode holder by a coupling block, a coupling rod disposed in a tube of said electrode holder and vertically movable when said air cylinder is operated, a positioning pin disposed on an upper portion of the coupling rod and having a tip end movable into and out of the through hole in said lower electrode when the coupling rod is vertically moved, and an air blowing mechanism for delivering air into an upper portion of the tube from a lower portion of said electrode holder, characterized in that said coupling block comprises a magnetic member, an insulation is provided between the electrode holder and the air cylinder, said air cylinder has a cylinder rod with magnetic graduations, and said air cylinder has a magnetic detecting element for detecting said magnetic graduations and an amplifier for amplifying a signal from said magnetic detecting element.
An device for welding a nut or the like, comprising a tubular electrode holder, a lower electrode coupled to an upper end of the electrode holder and having a through hole defined centrally therein, an air cylinder coupled to a lower end of said electrode holder by a coupling shaft, a coupling rod disposed in a tube of said electrode holder and vertically movable when said air cylinder is operated, a positioning pin disposed on an upper portion of the coupling rod and having a tip end movable into and out of the through hole in said lower electrode when the coupling rod is vertically moved, and an air blowing mechanism for delivering air into an upper portion of the tube from a lower portion of said electrode holder, characterized in that an insulation is provided between the electrode holder and the air cylinder, said air cylinder has a cylinder rod with magnetic graduations, and said air cylinder has a magnetic detecting element for detecting said magnetic graduations and an amplifier for amplifying a signal from said magnetic detecting element.
Dependencies are inferred from the claim text.