Drive mechanism for a small-sized printer

A printer comprising:

• a type wheel unit including (1) a cylindrical supporting member having a plurality of holes therearound, (2) a type belt having a back surface thereof provided with a plurality of projections and a front surface having a plurality of types each corresponding to one of said projections, said type belt being disposed around said supporting member so that each said projection is engaged with one of said holes around said supporting member, and (3) power transmission means mounted on an end of said type wheel unit and surrounding said type wheel unit;
• an ink roller for applying an ink to the types and disposed to avoid said power transmission means;
• hammer means accommodated within said type wheel unit for striking said projections of said type belt to project the corresponding type away from said supporting member and toward a printing paper;
• an outer-rotor type pulse motor mounted on a rotating axis of said type wheel unit at said type wheel end with a rotor of said motor fixed to said supporting member for rotation thereof;
• a paper feed roller arranged to intermittently contact said power transmission means to provide a force for feeding a printing paper so that said outer-rotor type pulse motor can directly rotate said type wheel unit and said type wheel can rotate said paper feed roller;
• wherein said power transmission means includes a resilient member having a projection formed on an outer circumferential portion thereof, and wherein said resilient member comprises a material having a frictional force sufficient to drive said paper feed roller.