Patent ID: 6931741

Claim:
A scale device comprising: a scale unit including: a scale member formed from a long member having a position signal region and at least a pair of fixing holes arranged longitudinally and on both sides of said position signal region; and a case member having at least a pair of fixing holes arranged longitudinally and through each of which a fastening member is inserted and screwed into a mounting hole formed in a first part of a machine to which the scale device is to be installed, the scale member being housed in said case member and fixed such that the fixing holes register with the corresponding fixing holes in the scale member; and a detector to be installed to a second part, moving in relation to the first part, of the machine, with a sensor being positioned opposite to the position signal region on the scale member, wherein the sensor detects travel of the first and second parts of the machine in relation to each other by the sensor moving relative to the scale member, the scale unit to be fixed to the first part of the machine with the fastening member inserted through the fixing holes in the scale and case members and then screwed into the mounting hole in the first part of the machine to fasten the scale member and the case member together.