Method for grinding glass funnel seal edge and apparatus therefor

A seal edge grinding apparatus for a glass funnel, wherein the glass funnel has a seal edge to be ground, said apparatus comprising:

• a supporting member for supporting the glass funnel at a yoke portion thereof;
• a grinding wheel for grinding the seal edge of the glass funnel;
• a mobile unit for moving said supporting member and said grinding wheel in a direction approaching each other by a certain vertical displacement;
• a controller for numerically controlling said vertical displacement of said supporting member and said grinding wheel by said mobile unit;
• and
• a pressing unit for pressing at least one of said supporting member and said grinding wheel at a certain pressure by a pressing force;
• wherein the seal edge of the glass funnel is ground by performing a pressure controlled grinding operation of said pressing unit, after the seal edge of the glass funnel has been ground with said grinding wheel by performing a feed controlled grinding operation, said feed controlled grinding operation being numerically controlled.

A seal edge grinding apparatus for a glass funnel, wherein the glass funnel has a seal edge to be ground, said apparatus comprising:

• a grinding wheel;
• a supporting member for supporting the glass funnel from above the glass funnel and for pressing the seal edge of the glass funnel against said grinding wheel, wherein the seal edge of the glass funnel is directed downwardly and said grinding wheel is located under said supporting member;
• an elevating member for vertically moving said supporting member;
• a pressing unit for pressing said supporting member toward said grinding wheel at a certain pressure;
• a mobile unit for moving said supporting member by a certain vertical displacement with respect to said grinding wheel;
• and
• a controller for numerically controlling said vertical displacement of said supporting member via said mobile unit.