PURPOSE: To coating a frame body with an adhesive by stably supplying a proper amount of the adhesive to a nozzle in order to bond a face plate to the frame body by arranging an adhesive supply means sending the adhesive to the nozzle on the basis of the detection signal from a core material detection means.

CONSTITUTION: When a gate-shaped arm 13 guided on a track moves on the upper side of the frame body 13 carried from a previous process by a work feeder 11, the core material detection means 15 arranged in front of the nozzle 14 arranged to the arm 13 detects core materials 2a, 2b and a predetermined amount of an adhesive is supplied to the nozzle 14 in a stable state from a tank by the pump 20c of an adhesive supply means and applied to the core materials 2a, 2b from the nozzle 14. At this time, by applying the adhesive to the core materials 2a, 2b from the nozzle 14, the adhesive is not applied to the entire surfaces of the core materials 2a, 2b but can be applied only to the center parts of the core materials 2a, 2b along the longitudinal direction thereof so as not to be applied to the side edges of the core materials 2a, 2b.