Patent ID: 8393256

Claim:
A glass plate cutting machine comprising: a cutter blade for forming a cut line on the glass plate; a moving device to move said cutter blade along the cut line which has been preset and is to be formed on the glass plate, a resilient pressing device to press said cutter blade against the glass plate by resilient pressing force caused by air pressure, and a control unit to control the resilient pressing device so as to alternately change over the intensity of the resilient pressing force of said cutter blade with respect to the glass plate in a movement of the cutter blade by the moving device for forming the cut line, said resilient pressing device including an air cylinder unit to press the cutter blade against the glass plate by the resilient pressing force caused by the air pressure supplied thereto, first air pressure source for generating first air pressure, second air pressure source for generating second air pressure which is higher than the first air pressure, and a valve mechanism to communicate the air cylinder unit alternately to the first and second air pressure sources, a control unit being adapted to control the valve mechanism so as to supply the first and second air pressure alternately to the air cylinder unit in a case of alternative changeover of the intensity of the resilient pressing force of the cutter blade with respect to the glass plate in the movement of the cutter blade by the moving device for forming the cut line.