Device for welding
First Claim
1. A device for welding, comprising:
- a tubular electrode holder, a lower electrode coupled to an upper end of the electrode holder and having a though 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, an air blowing mechanism adapted to deliver air into an upper portion of the tube from a lower portion of said electrode holder, wherein said coupling block comprises a magnetic member, an insulation is provided between the electrode holder and the air cylinder, wherein said air cylinder has a cylinder rod with magnetic graduations, and said air cylinder has a magnetic detecting element adapted to detect said magnetic graduations and an amplifier adapted to amplify a signal from said magnetic detecting elements, wherein a magnetic shielding member covers and magnetically shields the cylinder rod with the magnetic graduations, the magnetic detecting element, and the amplifier, and wherein said magnetic member and said coupling block, or said coupling shaft is disposed such that the magnetic flux density in the vicinity of the magnetic graduations on the cylinder rod, the magnetic detecting element, and the amplifier is suppressed to 500 gauss or less.
1 Assignment
0 Petitions
Accused Products
Abstract
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.
24 Citations
23 Claims
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1. A device for welding, comprising:
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a tubular electrode holder, a lower electrode coupled to an upper end of the electrode holder and having a though 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, an air blowing mechanism adapted to deliver air into an upper portion of the tube from a lower portion of said electrode holder, wherein said coupling block comprises a magnetic member, an insulation is provided between the electrode holder and the air cylinder, wherein said air cylinder has a cylinder rod with magnetic graduations, and said air cylinder has a magnetic detecting element adapted to detect said magnetic graduations and an amplifier adapted to amplify a signal from said magnetic detecting elements, wherein a magnetic shielding member covers and magnetically shields the cylinder rod with the magnetic graduations, the magnetic detecting element, and the amplifier, and wherein said magnetic member and said coupling block, or said coupling shaft is disposed such that the magnetic flux density in the vicinity of the magnetic graduations on the cylinder rod, the magnetic detecting element, and the amplifier is suppressed to 500 gauss or less. - View Dependent Claims (3, 4, 5, 6, 11, 13, 14, 15, 16)
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2. A device for welding, comprising:
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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, an air blowing mechanism adapted to deliver air into an upper portion of the tube from a lower portion of said electrode holder, an insulation is provided between the electrode holder and the air cylinder, wherein said air cylinder has a cylinder rod with magnetic graduations, and said air cylinder has a magnetic detecting element adapted to detect said magnetic graduations and an amplifier adapted to amplify a signal from said magnetic detecting elements, wherein a magnetic shield covers the cylinder rod with the magnetic graduations, the magnetic detecting element, and the amplifier, and wherein said magnetic shield is adapted to hold magnetic flux density in the vicinity of the magnetic graduations on the cylinder rod, the magnetic detecting element, and the amplifier to about 500 gauss or less. - View Dependent Claims (7, 8, 9, 10, 12, 17, 18)
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19. A device for welding, comprising:
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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, an air blowing mechanism adapted to deliver air into an upper portion of the tube from a lower portion of said electrode holder, wherein said air cylinder has a cylinder rod with magnetic graduations, and said air cylinder has a magnetic detecting element adapted to detect said magnetic graduations and an amplifier adapted to amplify a signal from said magnetic detecting element; and
means for suppressing magnetic flux density to about 500 gauss or less in the vicinity of the magnetic graduations on the cylinder rod, the magnetic detecting element, and the amplifier. - View Dependent Claims (20, 21, 22, 23)
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Specification