Inked ribbon core with ribs

An assembly for supporting a roll of web material, comprising an elongate spindle comprised of a shaft portion and a forward end portion, each of said portions having circumferentially disposed external contact means thereon, said spindle having a plurality of groove structures that extend axially along at least said shaft portion and that open forwardly and radially outwardly thereof and a core, for supporting a roll of web material, disengageably mounted on said spindle, said core comprising:

• a tubular body having opposite ends, an outer surface for receiving and supporting a length of web material wound thereupon, and an axial bore for receiving said spindle inserted into said body from one end;
• a plurality of circumferentially spaced ribs extending axially along said bore and radially inwardly from said body, said ribs being constructed for slidable engagement with said groove structures of said spindle;
• stop means, disposed on said body adjacent the opposite end thereof and within said bore, engaging said spindle inserted into said bore from said one end thereof, limiting the depth of insertion of said spindle and thereby defining a fully mounted position of said core thereon;
• and
• interference structure providing a substantially cylindrical contact surface, effectively circumscribing said bore, frictionally engaging said circumferentially disposed external contact means on said each of said portions of said spindle in said fully mounted position of said core thereon, said interference structure extending axially along a major portion of said bore from adjacent said stop means toward said one end of said body surface, said body additionally providing a lead-in section extending inwardly from said one end thereof, along a minor portion of said bore, said lead-in section providing a cylindrical inside surface having a diameter larger than the diameter of said substantially cylindrical contact surface.

An assembly for supporting a roll of web material, comprising an elongate, generally cylindrical spindle comprised of a shaft portion having outer circumferential elements along the length thereof, and a frustoconical leading end portion surrounded at its base by arcuate segments that provide circumferential contact surface elements, said spindle having a plurality of groove structures that extend axially along at least said shaft portion, that define at least one slot, and that open forwardly and radially outwardly thereof;

• and a core, for supporting a roll of web material, disengageably mounted on said spindle, said core comprising:
• a tubular body having opposite ends, an outer surface for receiving and supporting a length of web material wound thereupon, and an axial bore for receiving said spindle inserted into said body from one end;
• a plurality of circumferentially spaced ribs extending axially along said bore and radially inwardly from said body, said ribs being constructed for slidable engagement said groove structures of said spindle;
• stop means, disposed on said body adjacent the opposite end thereof and within said bore, engaging said spindle inserted into said bore from said one end thereof, limiting the depth of insertion of said spindle and thereby defining the fully mounted position of said core thereon;
• and
• interference structure providing a substantially cylindrical contact surface, effectively circumscribing said bore and frictionally engaging said outer circumferential contact elements on said shaft portion and said circumferential contact surface elements surrounding said leading end portion of said spindle, in said fully mounted position of said core thereon, said interference structure extending axially along a major portion of said bore from adjacent said stop means toward said one end of said body, said at least one rib being of uniform circumferential width along at least its entire effective length and being engaged in said at least one slot, and said core being devoid of spindle-engaging elements other than said ribs, said stop means, and said substantially cylindrical contact surface, said body additionally defining a lead-in section extending inwardly from said one end thereof, along a minor portion of said bore, said lead-in section providing a cylindrical inside surface having a diameter larger than the diameter of said substantially cylindrical contact surface.