Hand-cranked pencil sharpeners

A hand-crank pencil sharpener, comprising a housing, a gearing member and a sharpening member, the gearing member and the sharpening member being installed within the housing, and the gearing member being connected to a hand crank and transmitting a rotation of the crank to the sharpening member,

• wherein the sharpener further comprises a feeding member arranged in the feeding path, and
• wherein the gearing member comprises a gearing branch for driving the feeding member, and the inserted pencil is fed into or withdrawn from the sharpener automatically by a linkage of the gearing branch and the feeding member when the crank is rotated clockwise or counterclockwise,
• wherein the feeding member comprises a feeding gear set driven by the gearing branch and a pair of feeding rubber tyres driven by the feeding gear set, the pair of feeding rubber tyres are mounted on two actuation shafts, respectively, the actuation shafts are connected by at least one resilient member for adjusting an interval between the feeding rubber tyres so that pencils having diameters different from one another are able to be inserted and pre-tightened.