Patent ID: 7814819

Claim:
A tip holder for holding a rotating shaft which is inserted through an axial center of a cutter wheel tip for scribing a brittle object, the tip holder comprising: first and second supporting holes into which side portions of the rotating shaft are respectively inserted, the first and second supporting holes being respectively provided in first and second side walls which are located so as to define a slot to interpose the cutter wheel tip therebetween, and a closing plate pivotable between an open and a closed position, wherein one of the supporting holes extends entirely through a respective one of said side walls and is adjacent the closing plate, and the closing plate pivots about a pivot axis different from a longitudinal axis running through centers of the first and second supporting holes and the respective one of said side walls between the open and the closed positions such that when the closing plate is in the closed position, the closing plate closes the supporting hole that extends entirely through to prevent removal of the shaft, and when the closing plate is in the open position the supporting hole that extends entirely through is exposed to permit removal of the shaft.