Repositionable supporting apparatus for a workpiece feeding device

A repositionable supporting apparatus for a workpiece feeding device which is used to feed a workpiece along a work path on a worktable for a cutting tool to work thereon, said supporting apparatus comprising:

• a lower post having a bottom end portion adapted to be fixedly secured relative to the worktable, and an upper end portion opposite to said bottom end portion in an axial direction;
• an upper post disposed co-axially rotatable relative to said lower post around an axis parallel to the axial direction, and having an abutment end portion with a downward abutment wall disposed proximate to said upper end portion of said lower post, and an anchored end portion opposite to said abutment end portion in the axial direction, said downward abutment wall defining an upper cavity therein which extends upwardly and which is radially distant from said axis;
• a cantilever member having an anchoring end mounted on said anchored end portion, and a holding end opposite to said anchoring end in a direction radial to the axial direction and adapted to carry the workpiece feeding device;
• a coupling member disposed on said upper end portion of said lower post to couple said upper end portion with said abutment end portion in a retained position where said upper post is prevented from rotation relative to said lower post, and in a released position where said upper post is rotatable relative to said lower post, said coupling member including an upward abutment wall to slidably contact said downward abutment wall, said upward abutment wall defining a lower cavity therein which extends downwardly and which is aligned and in communication with said upper cavity;
• a tumbler pin disposed in and movable relative to said lower cavity between a locked position where said tumbler pin protrudes into said upper cavity, and an unlocked position where said tumbler pin is retracted to be flush with said upward abutment wall so as to permit sliding movement of said downward abutment wall relative to said upward abutment wall around said axis, thereby moving the workpiece feeding device away from the cutting tool so as not to interfere with replacement of the cutting tool;
• a first biasing member disposed to bias said tumbler pin to protrude into said upper cavity;
• and
• a depressing member disposed to depress said tumbler pin downwards and against biasing action of said first biasing member.