Electrophotographic copying apparatus having a dual cam synchronizing mechanism

Claim 1

In an electrophotographic copying apparatus including a rotary drum having a shaft and a photosensitive sheet wrapped around the periphery of said rotary drum and having a toner image formed thereon, apparatus for feeding recording paper to said rotary drum for transfer printing the toner image upon said recording paper comprising: a magazine for holding a stack of recording paper, a recording paper feeding roller disposed above said stack, a first arm for moving said roller toward and away from said stack, a first cam mounted on the shaft of said rotary drum for operating said first arm to dispose said recording paper feeding roller on said stack, a second cam mounted on the shaft of said rotary drum, a second arm pivotally supported by the stationary portion of the apparatus with one end operatively connected to said second cam, a segmental gear mounted on the other end of said second arm, a pinion driven by said segmental gear for driving said recording paper feeding roller to feed the uppermost sheet of said stack toward said rotary drum in a predetermined timed relationship with the rotation of said rotary drum, an intermediate roller disposed between said stack and said rotary drum for temporarily arresting said recording paper fed by said recording paper feeding roller, and means for driving said intermediate roller for feeding said temporarily arrested recording paper to said rotary drum in synchronism with the rotation of said rotary drum.