Workpiece Holding Frame

Abstract

A holding frame includes upper and lower frame members having substantially the same thicknesses, and an inner frame member detachably attachable to the inner peripheries of the upper and lower frame members. The upper and lower frame members are fixed together in vertically superposed relation to each other with a workpiece sandwiched therebetween. The workpiece can be set on the frame in any desired of a first stretched-taut state where the workpiece is stretched taut and generally flush with the upper surface of the upper frame member by being pressed upward via the inner frame member, and a second stretched-taut state where the workpiece is stretched taut and generally flush with the lower surface of the lower frame member by being pressed downward via the inner frame member. The workpiece can be held on the frame with substantially the same degrees of tautness in the first and second stretched-taut states.

1 . A workpiece holding frame comprising:
 an upper frame member;   a lower frame member having generally a same thickness as said upper frame member;   a fixing member for mutually fixing said upper frame member and said lower frame member vertically superposed on each other with a workpiece sandwiched therebetween; and   an inner frame member detachably attachable to inner peripheries of said upper frame member and said lower frame member,   said workpiece holding frame being capable of setting thereon the workpiece in any desired one of a first stretched-taut state where the workpiece is stretched taut and generally flush with an upper surface of said upper frame member by being pressed upward via said inner frame member, and a second stretched-taut state where the workpiece is stretched taut and generally flush with a lower surface of said lower frame member by being pressed downward via said inner frame member.   
     
     
         2 . The workpiece holding frame as claimed in  claim 1 , wherein said fixing member is constructed to mutually fix said upper frame member and said lower frame member by magnetic force. 
     
     
         3 . The workpiece holding frame as claimed in  claim 1 , which further comprises a member for fixing said inner frame member to at least one of said upper frame member and said lower frame member.