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(11) | EP 1 387 221 A8 |
(12) | CORRECTED EUROPEAN PATENT APPLICATION |
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(54) | Image forming apparatus including speed detection mechanism for a rotary member |
(57) An image forming apparatus including a rotary member (10) having an image formation
area, and a scale (70) located at a position outside of the image formation area and
on an inner circumference of the rotary member (10). Also included is a drive device
(80) configured to drive the rotary member (10), a developing device configured to
develop an image on the image formation area of the rotary member, and a transfer
device (22) configured to transfer the image on the image formation area to a recording
sheet. Further included is a sensor (71) configured to detect the scale (70) on the
rotary member (10) and to output a signal corresponding to the detection of the scale
(70). |