Device for filament end-rounding and a method for end-rounding (tooth)brush filaments

A method of smoothening bristle filament ends (22), the method comprising:

• providing first ends (22) of bristle filaments (20) of a filament bunch (23) to an end-rounding device (10), wherein the bunch (23) comprises a multiple of bristle filaments (20) of a bristle tuft arranged in parallel to each other;
• end-rounding the first ends (22) by contacting them with an abrasive surface (13) of a movable body (12B) of the end-rounding device (10);
• moving the abrasive surface (13) over the first ends (22) for a predefined period of time;
• and
• cutting a section (26) from the bunch (23) comprising the first ends (22) and bristle filaments (20) of a predefined length (L),
• wherein the end-rounding device comprises a movable body (12B) comprising an abrasive surface (13);
• a gearing (14) structured and configured to transfer a movement from a motor (15) to the movable body (12B);
• a providing unit (17) structured and configured to provide a plurality of bristle filament ends (22) to the abrasive surface (13), wherein the providing unit (17) comprises a clamping unit (16) structured and configured to clamp a bunch (23) of filaments (20), wherein the bunch (23) comprises a multiple of filaments (20) of a bristle tuft;
• wherein the abrasive surface (13) has a diameter (D1) from 80 mm to 300 mm and comprises a concave curvature oriented in the direction of the clamping unit (16) and wherein the clamping unit (16) is movably spaced from the abrasive surface (13) at a distance (D2).