Positioning and clamping apparatus

A positioning and clamping apparatus comprising:

• a support barrel having a supporting face formed thereon for supporting a member to be fixed and provided with a positioning pin to which a positioning hole formed on said member to be fixed is fitted;
• a clamp arm mounted in a slit formed in said positioning pin so as to be able to swing and so as to be able to move axially in an advancing/retreating direction, and having a clamp jaw provided at a tip thereof for clamping said member to be fixed between said supporting face and said clamp jaw;
• a drive housing mounted to a rear end portion of said support barrel, and having a reciprocating shaft connected to said clamp arm so as to be able to axially reciprocate;
• a spring member provided in said drive housing, for applying a spring force to said clamp arm in a retreating direction via said reciprocating shaft;
• a plunger mounted in said drive housing so as to be able to reciprocate, a brought into contact with said reciprocating shaft;
• and
• a motor mounted to a rear end portion of said drive housing and provided with a rotor connected in a threading manner to a male screw member secured on said plunger.