| 摘要 |
PURPOSE:To omit a fitting tool which is hitherto required and to speed up assembling by fitting a photosensor block to an end bracket by a positioning engaging means. CONSTITUTION:The photosensor block 59 attached to a printed substrate 58 is provided with a light emitting element and a photodetector through a slit disc 54. Pins 60, 61 having functions as positioning engaging parts and two fitting surfaces 62, 63 are fitted to the other side of the photosensor block 59. The fitting surfaces 62, 63 of the photosensor block 59 are abutted to the reference surfaces 56, 57 of the end blacket 55 to fix the positional relation of a motor axis direction between the slit disc 54 and the photosensor block 59. Subsequently, the block 59 is slided and the pins 60, 61 are pushed to the external periphery of a bearing case 53, so that the positional relation in the direction rectangular to the motor axis between the slit disc 54 and the photosensor block 59 is fixed. |
