Patent ID: 6718837
Filing Date: 2004-04-13
Classification: B23K,F16H,Y10T

Abstract:
A driving unit for a welding apparatus, said driving unit comprising:a pressure application shaft; a ball screw assembly for converting rotation of an output shaft of a motor to reciprocating motion of said pressure application shaft; a rolling guide arrangement provided between a portion of said pressure application shaft and a housing of said driving unit, said guide arrangement including an elongate rail fixed to said housing and a bearing fixed to said portion of said pressure application shaft and rollingly engaged with said rail, said ball screw assembly, said pressure application shaft, and said guide arrangement being secured to and disposed within said housing; and said housing having a transverse cross-sectional configuration which is U-shaped and opens downwardly such that a lower portion of said housing defines a bottom opening, said driving unit further including a plate fixed to said lower portion of said housing so as to close off said bottom opening, said plate being a separate component from said housing and removably attached thereto to permit installation of said ball screw assembly, said pressure application shaft and said guide arrangement as a preassembled unit within said housing through said bottom opening.