Method and apparatus for manufacturing individual brush unit of rotary toothbrush

A apparatus for manufacturing an individual brush unit that constitutes a rotary brush by being stacked in multiple layers, the apparatus comprising:

• an anvil having an insertion hole through which a filament group passes, the filament group being a collection of multiple filaments in a bundle;
• a filament feeding unit which includes a feeder including a ring cutter for cutting the filament group provided on a tip of the feeder, the filament feeding unit feeding the filament group from the feeder and holding the filament group while a predetermined amount of the filament group protrudes outward from the insertion hole of the anvil;
• and
• an ultrasonic welder including a horn having a horn tip portion, the horn pushing and radially expanding a protruding tip of the filament group, and welding a central part of the expanded filament group, to form the individual brush unit, wherein
• a core of the welded central part is sandwiched between the ring cutter and the horn tip portion and is cut out, to simultaneously form a shaft hole and separate the individual brush unit from the filament group, and
• the core of the welded central part is sandwiched between the ring cutter and the horn tip portion and is cut out, after the core of the welded central part cools down.

A apparatus for manufacturing an individual brush unit that constitutes a rotary brush by being stacked in multiple layers, the apparatus comprising:

• an anvil having an insertion hole through which a filament group passes, the filament group being a collection of multiple filaments in a bundle;
• a filament feeding unit which includes a feeder including a ring cutter for cutting the filament group provided on a tip of the feeder, the filament feeding unit feeding the filament group from the feeder and holding the filament group while a predetermined amount of the filament group protrudes outward from the insertion hole of the anvil;
• and
• an ultrasonic welder including a horn having a horn tip portion, the horn pushing and radially expanding a protruding tip of the filament group, and welding a central part of the expanded filament group, to form the individual brush unit, wherein
• a core of the welded central part is sandwiched between the ring cutter and the horn tip portion and is cut out, to simultaneously form a shaft hole and separate the individual brush unit from the filament group, and
• the core of the welded central part is sandwiched between the ring cutter and the horn tip portion and is cut out, after the horn stops welding the filament group.