Bead core coating method and bead core coating apparatus

A bead core coating apparatus that coats an annular bead core with a belt-shaped rubber sheet, the bead core coating apparatus comprising:

• an extruder that extrudes the rubber sheet;
• a rotary drum that winds the rubber sheet extruded from the extruder;
• a covering device that supports the bead core such that an outer circumferential surface of the rotary drum and an outer surface of the bead core come closer to each other at a position on a downstream side in a rotation direction of the rotary drum with respect to the extruder, the covering device rotating the supported bead core;
• an air injection mechanism that is disposed on a downstream side in a rotation direction of the bead core with respect to a position where an outer circumferential surface of the rotary drum and an outer surface of the bead core are close to each other;
• and
• a controller that controls the extruder, the rotary drum, the covering device, and the air injection mechanism,
• a holding roller that is disposed on the downstream side in the rotation direction of the bead core with respect to the air injection mechanism and on an opposite side to the bead core with the rubber sheet interposed between the bead core and the holding roller
• wherein the controller winds the rubber sheet extruded from the extruder from a leading end of the rubber sheet around the outer circumferential surface of the rotary drum, sticks, from the leading end, a central portion in a width direction of the rubber sheet existing on the outer circumferential surface of the rotary drum to the outer surface of the bead core which is in rotation before the rubber sheet is wound around an entire circumference of the outer circumferential surface of the rotary drum, winds both ends in the width direction of the rubber sheet stuck on the outer surface of the bead core while sequentially sticking both the ends in the width direction along the outer surface of the bead core from the central portion in the width direction toward each of the ends in the width direction using the covering device,
• the controller causes the air injection mechanism to blow air to a gap generated between the central portion in a width direction of the rubber sheet and the outer circumferential surface of the rotary drum at a place where the rubber sheet is peeled from the rotary drum, and
• the holding roller holds the rubber sheet immediately after the rubber sheet is peeled from the rotary drum.