| 摘要 |
The internal compressive stresses sub-adjacent the surfaces of relatively thick (over 1/2 inch) glass sheet material are mechanically reduced on the surface to be scored by bending the glass during the scoring process to allow a glass cutting wheel of conventional geometry to overcome these stresses, and thereby produce a fissure in response to conventional levels of applied force. Spaced pressure applying rollers are provided alongside the cutter wheel, and an anvil wheel located below the cutter wheel reacts the bending moment forces so applied. In one version, these pressure rollers are also used to break out the glass in a second pass, with the cutter wheel retracted. In a second version an additional pair of break out rollers is provided downstream of the cutter wheel, and a pair of stress neutralizing pressure rollers act on the underside of the sheet to prevent running of the break back toward the cutter wheel.
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