| 摘要 |
PROBLEM TO BE SOLVED: To prevent an mounting error of a supporting member supporting a member to be supported by determining the mounting direction of the supporting member to the member to be supported in the direction of the engagement of a part to be engaged and an engagement part. SOLUTION: A positioning part 17 is mounted on a back side of a device body 8, this positioning part 17 is provided with a body side engagement part 20 formed by cutting an outer periphery 19 of the positioning part 17, and the body side engagement part 20 is provided with the first, second and third cutout parts 21, 22, 23. A central angle on a screw hole 18 between the first cutout part 21 and the second cutout part 22 is 90 degree, and a central angle on the screw hole 18 between the second cutout part 22 and the third cutout part 23 is 90 degree. The screw hole 18 and an upper mounting hole 28 are fitted, an upward rising peripheral wall 33 is positioned close to the outer periphery 19 of the positioning part 17, the first cutout part 21 and a second projecting part 31 as a part to be engaged are engaged with one another, and the second cutout part 22 and a first projecting part 30 are engaged with one another.
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