| 摘要 |
PURPOSE:To improve the reliability as a pulse encoder by a construction wherein a rotary mechanism element of the pulse encoder is fitted to a motor housing by a leaf spring so that it has a high rigidity in the direction of rotation and allows flexibility in the direction of a rotation axis, and also a printed board is fixed to the motor housing in the manner of a rigid body. CONSTITUTION:A shaft 10 for an encoder is fitted to a tapered end 1' of a shaft 1 of a motor through the intermediary of a tightening nut 9, and a rotary slit plate 5 is fixed to the end part of the shaft 10. Then, a support 15 is put on the shaft 10 through the intermediary of a bearing 11, a reverse-L-shaped projecting piece 15' is provided thereon from the above, and a photosensing element 6 and a light-emitting element 4 are fixed on the support 15 and the projecting piece 15' respectively so that they are in a state of holding the slit plate 5 between respectively. Moreover, the support 15 is joined to an encoder cover 12 by a leaf spring 3 through the intermediary of a fitting piece 16. Then, the cover 12 is connected to a motor housing 2 in the manner of a rigid body, while a printed board 8 is fixed to an internal projection 12'. Various electric circuit components 7 are arranged on this printed board 8 and the elements 4 and 6 are connected thereto by electric signal wires 18 and 18' put in a slackened state.
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