Printing apparatus

A printing apparatus comprising;

• a motor producing a rotational drive torque,
• torque transmission means,
• a drive wheel fixedly mounted on a rotary shaft and driven by the rotation drive torque through said torque transmission means, said drive wheel being rotated in one direction,
• a base frame rotatably supporting said rotary shaft,
• a swingable support plate swingably supported to said rotary shaft,
• a printing drum rotatably supported to said swingable support plate and having at one end a first circumferential torque transmission part engaged with said drive wheel,
• printing web feeding means for feeding a printing web so as to face the circumferential surface of said printing drum, said printing web feeding means having a rotational axis parallel to the rotational axis of said printing drum,
• biasing means for biasing said printing drum in the opposite direction to the printing web to be fed, and
• forcible stopping means for selectively preventing said printing drum from rotating around its own axis, and to simultaneously effect printing,
• said one direction of rotation of said drive wheel being determined such that, when said forcible stopping means is operative to prevent rotation around the axis of said printing drum caused by rotational torque transmitted from said drive wheel, said printing drum is rotated around only said rotary shaft toward said printing web in a sun-and-planet motion to effect printing by rotational torque transmitted from said drive wheel.