A coupler includes a body having first and second recesses that are adapted for respectively receiving first and second associated pins of an associated bucket or other implement. At least one bypass passageway is formed in a dead space located between the scroll case and the air conditioning case, whereby some of air sucked from the intake duct is bypassed and sucked toward the second wheel of the dual blower wheel, to which the motor is connected. The device further includes an N+ buried layer underlying the HVPW region and the HVNW region and a p-type substrate underlying the N+ buried layer. Further, the angled arrangement provides a neater arrangement, and better facilitates maintenance and service procedures by providing improved visibility of labeling surfaces. The parallel acquisition and processing of the output signals enhances accuracy. When the detecting pattern is formed, the ink droplets are ejected at almost the same position in the state in which the transportation of the recording medium is stopped or a feeding speed of the recording medium is set slower than that during a normal printing operation.