Patent ID: 7281441

Claim:
A media thickness detector, comprising: at least one sensing roller, against which a passing media bears; a central member spaced from said sensing roller; a first bearing holder attached to said central member; a first sensing bearing attached to said first bearing holder; a second bearing holder attached to said central member; a second sensing bearing attached to said second bearing holder; at least one elastic member tending to move said central member, such that said first and second sensing bearings are brought to bear against said at least one sensing roller; and a thickness sensor for detecting a thickness of the media passing between said first and second sensing bearings and said sensing roller based on a movement amount of said bearing holders, wherein the first and second bearing holders include an adjustment mechanism configured to first loosen the first and second bearing holders on the central member such that the first and second bearing holders can be freely rotated on the central member and moved to different positions on the central member and then to secure the first and second bearing holders at desired positions on the central member so that said first and second sensing bearings attached respectively to the first and second bearing holders can be brought to bear against said at least one sensing roller with a substantially equal force.