Crayon sharpener

A crayon sharpener, comprising:

• a blade holder with a cavity for receiving a tip of the crayon, the cavity having a central longitudinal axis and frustoconical wall portions tapering inwardly from a mouth to an end;
• a first blade mounted to the blade holder with a first cutting edge aligned with the wall portions for cutting a frustoconical face on the tip of the crayon;
• one or more cutting edges separate from the first cutting edge for cutting the sleeve and forming a shoulder at an inner end of the frustoconical face;
• a motor drive;
• a rotary output driven by the motor drive for rotation about the axis, the rotary output including one of a first coupling and a second coupling, wherein
• the blade holder includes the other of the first coupling and the second coupling for releasably connecting the blade holder to the rotary output;
• the first coupling has an aperture extending between first and second mouth portions in a transverse side and longitudinal end of the first coupling, respectively, the first and second mouth portions being joined by a slotted mouth portion,
• the second coupling has a neck terminating in a head at an axial end of the neck, the neck being sized to pass through the slotted mouth portion, and the head being sized to pass transversely through the first mouth portion,
• each of the first and second couplings has a drive face, whereby interengagement of the drive faces transmits torque between the first and second couplings, and
• each of the first and second couplings has a cylindrical face, whereby interengagement of the cylindrical faces maintains axial alignment between the first and second couplings;
• and
• a latch fixed to the first coupling for engaging the second coupling in a latched position to prevent the head from escaping from the first mouth portion.