Driving unit for pressure application shaft in a welding apparatus

Abstract

Since components constituting a driving unit for pressure application shaft are integrally assembled with one another, and the driving unit for pressure application shaft is integrally fixed to a housing body, the precious driving unit for pressure application shaft can be obtained with ease, and consequently, it is possible to provide the precious driving unit for pressure application shaft in a welding apparatus at low cost. The driving unit for pressure application shaft in a welding apparatus includes a housing for housing therein a ball screw mechanism for converting rotation of an output shaft of a motor into reciprocating motion of a pressure application shaft, and a direct acting type rolling guide mechanism provided between a pressure application shaft member and the housing, characterized in that the housing comprises a housing body which is opened at one side in a substantially U-shape in cross section, and a plate for covering the opened portion, and pressure application mechanism members comprise the ball screw mechanism, the pressure application shaft member, the direct acting type rolling bearing which is fixed to the pressure application shaft member, and a rail combined with the direct acting type rolling bearing, and wherein the pressure application mechanism members are fixed to the housing body, and the plate is fixed to the opened portion of the housing body.

What is claimed is:  
     
         1 . A driving unit for pressure application shaft in a welding apparatus to be driven by a motor including a housing for housing therein a ball screw mechanism for converting rotation of an output shaft of a motor into reciprocating motion of a pressure application shaft, and a direct acting type rolling guide mechanism provided between a pressure application shaft member and the housing, wherein the housing comprises a housing body which is opened at one side in a substantially U-shape in cross section, and a plate for covering the opened portion, and wherein pressure application mechanism members comprise the ball screw mechanism, the pressure application shaft member, the direct acting type rolling bearing which is fixed to the pressure application shaft member, and a rail combined with the direct acting type rolling bearing, and wherein the pressure application mechanism members are fixed to the housing body, and the plate is fixed to the opened portion of the housing body.  
     
     
         2 . The driving unit for pressure application shaft according to    claim 1   , wherein a front end of the housing is covered with a front wall, and a penetration hole through which the pressure application shaft is inserted is formed on the front wall, and no bearing is provided in the penetration hole.  
     
     
         3 . The driving unit for pressure application shaft according to    claim 1   , wherein a rear end of a fixed arm is fixed to the U-shaped housing body.  
     
     
         4 . The driving unit for pressure application shaft according to    claim 1   , wherein the U-shaped housing body is formed by an extrusion molded member made of aluminum alloy.  
     
     
         5 . The driving unit for pressure application shaft according to    claim 1   , wherein a machining portion for manually rotating a ball screw shaft is formed at the rear end of the ball screw shaft of the ball screw mechanism.