Method of and apparatus for welding spring to aperture grill

A spring welding apparatus for welding panel attachment springs to at least three side portions of a substantially rectangular aperture grill having a color selection grill

• a table;
• an aperture-grill supporting means for supporting said aperture grill on said table so that a posture of the former can be adjusted;
• a grill-position measuring means for measuring a plurality of measurement positions of said selection grill in a state that said aperture-grill supporting means supports said aperture grill;
• an aperture-grill posture adjusting means for driving said aperture-grill supporting means based on measurement obtained by said grill-position measuring means and for adjusting the posture of said aperture grill so that the plurality of measurement positions of said selection grill should be located at respective predetermined positions;
• an aperture-grill positioning means for positioning on said table said aperture grill adjusted in posture by said aperture-grill posture adjusting means;
• a spring positioning means disposed at positions opposed to said at least three side portions of said aperture grill positioned by said aperture-grill positioning means, for bringing said springs in contact with said at least three side portions to position the former;
• and
• a spring welding means for welding the springs positioned by said spring positioning means to the side portions of said aperture grill positioned by said aperture-grill positioning means.

A method of welding a spring to an aperture grill, wherein panel attachment springs are welded to four side portions of a substantially rectangular aperture grill having a color selection grill, said method comprising:

• disposing said springs at first, second, third, and fourth spring pins with four spring positioning means for positioning said springs;
• disposing said aperture grill so that said selection grill is opposed to a reference plane determined by the spring pins of three spring positioning means of said four spring positioning means;
• measuring a plurality of measurement positions of said selection grill relative to said reference plane;
• adjusting a posture of said aperture grill based on the respective measurement positions of said selection grill so that said respective measurement positions are located at predetermined reference positions relative to said reference plane;
• matching positions of the respective spring pins of said four spring positioning means with positions of panel pins provided on four side portions of a panel of a cathode-ray tube;
• and
• welding said four springs to the four side portions of said aperture grill simultaneously.

A spring welding apparatus for welding panel attachment springs to four side portions of a substantially rectangular aperture grill having a color selection grill

• a table;
• an aperture-grill supporting means for supporting said aperture grill on said table at at least three positions so that a posture of the former can be adjusted;
• a grill-position measuring means for measuring of a plurality of measurement positions of said selection grill in a state that said aperture-grill supporting means supports said aperture grill;
• an aperture-grill posture adjusting means for adjusting said aperture-grill supporting means based on measurements obtained by said grill-position measuring means and for adjusting a posture of said aperture grill so that a plurality of measurement positions of said selection grill are located at corresponding predetermined positions;
• an aperture-grill positioning means for positioning on said table said aperture grill at a posture adjusted by said aperture-grill posture adjusting means;
• first, second, third and fourth spring positioning means disposed at positions opposed to the four side portions of said aperture grill positioned by said aperture-grill positioning means, for contacting said springs with said four side portions;
• and
• a spring welding means for welding the springs positioned by said spring positioning means to the side portions
• wherein of said four spring positioning means, said second and third spring positioning means are opposed to each other in a first direction and can be moved and adjusted in the first direction, a first spring positioning means in a second direction perpendicular to the first direction can be moved and adjusted in the first and second directions, and said fourth spring positioning means in the second direction can be moved and adjusted in the first, second and third directions.