Patent ID: 8768217

Claim:
A drive comprising: a driving roller that has a hollow portion penetrating through the driving roller in a rotation-axis direction and that drives a driven body by rotation of the driving roller; a driving shaft that includes a distal end portion having a screw hole at a distal end of the distal end portion and being inserted into the hollow portion from a first end of the driving roller in the rotation-axis direction, and a fit portion being fitted to the first end of the driving roller while the distal end portion is inserted into the hollow portion, and that transmits a rotational driving force to the driving roller through the fit portion; a spring washer arranged at a second end of the driving roller opposite to the first end in the rotation-axis direction; a screw rod that has at a distal end of the screw rod an external thread which is screwed into the screw hole, that is inserted into the spring washer at the second end and inserted into the hollow portion from the second end, and that pinches the driving roller between the screw rod and the fit portion of the driving shaft in the rotation-axis direction through the spring washer when the external thread is screwed into the screw hole formed at the distal end of the distal end portion inserted into the hollow portion from the first end; and a driving source that rotates the driving shaft.