Patent ID: 7100859

Claim:
A holder device holding a recording paper roll having a tubular spool shaft and a continuous recording paper wound thereon and rotated together with said recording paper roll by a motor drive, said holder device comprising: a shaft portion passing through said spool shaft and rotated by said motor drive; claw members attached to said shaft portion, each of said claw members being movable between a first position in which said claw members protrude into an inner surface of said spool shaft, and a second position in which said claw members are away from said first position with respect to said inner surface of said spool shaft; and springs for biasing said claw members toward said first positions, said claw members being in contact with said inner surface of said spool shaft when said recording paper roll is attached to said holder device, wherein the claw members are disposed such that a rotation of said shaft portion produces a frictional force between said claw members and said inner surface of said spool shaft and engages said claw members with said spool shaft to move said claw members to said first positions, wherein said claw members have first claw members disposed such that said first claw members move to said first positions only when said shaft portion rotates in a first direction, and second claw members disposed such that said second claw members move to said first positions only when said shaft portion rotates in a second direction opposite to said first direction, wherein a taper surface is formed at a tip of each of said claw members in an axial direction, and wherein said claw members are disposed such that said spool shaft pushes said taper surface in order to move said claw members toward said second positions when said shaft portion penetrates through said recording paper roll.