Method and device for manufacturing rotary brush and roll tooth brush

A rotary brush manufacturing method comprising the steps of:

• projecting, by a specified amount, a wire group formed by assembling together a plurality of wires in a bundle outward through an insert hole provided in a pedestal;
• inserting a cone into the center of the projected end of the wire group to push open the wire group in radial directions;
• welding a center portion of the wire group in an annular shape with the pushed-open wire group being fixed to the pedestal;
• cutting the inner side of the annular welded part to form a brush unit having a hub at the center thereof and having a plurality of bristles projecting radially from the hub;
• making a core pipe be inserted in and hold the hub of the brush unit;
• taking the brush unit, together with the core pipe, out of the pedestal;
• and
• repeating these steps to make a plurality of brush units be held insertingly in the core pipe, thereby forming a rotary brush having a plurality of bristles projecting radially.

A rotary brush manufacturing device comprising:

• a pedestal having an insert hole through which a wire group formed by assembling together a plurality of wires in a bundle is to be passed;
• a chuck for grasping the wire group and holding the wire group so that it projects outward from the insert hole of the pedestal by a specified amount;
• a cone to be inserted into the center of the projected end of the wire group to push open the wire group in radial directions;
• a pressing member for fixing the pushed-open wire group to the pedestal;
• a welder for welding a center portion of the wire group in an annular shape with the wire group being fixed to the pedestal;
• a cutting machine for cutting the inner side of the wire group while leaving the welded part to form a brush unit having a hub at the center thereof and having a plurality of bristles projecting in outwardly radial directions from the hub;
• and
• a pipe handling machine for making a core pipe be inserted in and hold the hub of the brush unit and taking out the brush unit, together with the core pipe, to the exterior of the pedestal.

A roll toothbrush manufacturing method comprising the steps of:

• projecting, by a specified amount, a wire group formed by assembling together a plurality of wires in a bundle outward through an insert hole provided in a pedestal;
• inserting a cone into the center of the projected end of the wire group to push open the wire group in radial directions;
• welding a center portion of the wire group in an annular shape with the pushed-open wire group fixed to the pedestal;
• cutting the inner side of the annular welded part to form a brush unit having a hub at the center thereof and having a plurality of bristles projecting radially from the hub;
• making a core pipe be inserted in and hold the hub of the brush unit;
• taking out the brush unit, together with the core pipe, to the exterior of the pedestal;
• repeating these steps to make the core pipe insertingly hold a plurality of the brush units, thereby forming a roll-like rotary brush with a plurality of bristles projecting radially;
• and making the rotary brush be supported in a rotatable manner in a handle member.

A method for manufacturing a brush unit for rotary brush, which is overlaid in plurality to form a rotary brush, comprising:

• a first step of projecting, by a specified amount, a wire group formed by assembling together a plurality of wires in a bundle outward through an insert hole provided in a pedestal;
• a second step of blowing air into the center of a projected side of the wire group to push open the wire group in radial directions;
• a third step of welding a center portion of the wire group with the opened wire group being fixed to the pedestal;
• and
• a fourth step of cutting off a central part of the welded center portion.