Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1988-07-21
1991-01-01
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
25023116, G01D 534
Patent
active
049820842
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method for attaching a pulse encoder to be built in a motor to the motor, and relates to the motor having the pulse encoder attached thereto by that method.
BACKGROUND ART
A method whereby a rotary coded plate is first attached and then a stationary coded plate is attached on the basis of the rotary coded plate, is adopted in the prior art as a method for attaching the pulse encoder to the motor. Namely, the rotary coded plate is attached to one end of an output shaft of the motor so as to be at a right angle to a central axis of the shaft and centrally aligned. On the other hand, the stationary coded plate is fixed upon a plate member having a recess for mounting a light sensor, by an adhesive agent, and the position of the light sensor is adjusted in two dimensions (in a plane) with regard to the positions of slits of the stationary coded plate, and the light sensor is fixed by screws. A spacer is interposed between the plate element and one end of the motor so that the plate element having the light sensor and the stationary coded plate are separated from said rotary coded plate by a predetermined clearance distance, and the position of the plate element is adjusted in two-dimensional directions so that slits of the rotary coded plate are coaxial with slits of the stationary coded plate, and the plate element is fixed to one end of the motor by screws.
Conventionally, a pulse encoder is built in a motor in the manner mentioned above, but it is time-consuming to attach the pulse encoder to the motor in such a manner, and an accurate attachment thereof cannot be efficiently achieved. Namely, a working step is necessary whereby the stationary coded plate is mounted separately from one end of the motor and spaced from the first mounted rotary coded plate by a predetermined clearance distance. This clearance distance must be made shorter as a resolution power of the pulse encoder increases, and thus the adjustment work becomes more difficult. Furthermore, the position of the plate element having the stationary coded plate must be adjusted in two dimensional directions so that the positions of slits of the stationary coded plate are set coaxially with the positions of slits of the rotary coded plate.
DISCLOSURE OF THE INVENTION
Accordingly, an object of the present invention is to solve the above problems by providing a method for building each element of a pulse encoder in a motor accurately and efficiently, and thus provide a motor with the pulse encoder built therein by the above method.
In view of the above-mentioned object, the present invention provides a method for attaching a pulse encoder to a motor, characterized by temporarily attaching a stationary coded plate having a circular track pattern coaxial with slits thereof and provided with a light sensor, onto one end of a motor housing formed at a right angle to a central axis of an output shaft of the motor; rotating the motor housing around the output shaft to centrally align the stationary coded plate according to a deformation of the circular track pattern caused by a central deviation during rotation of the stationary coded plate; precisely fixing the stationary coded plate onto the one end of the motor housing; and inserting a sleeve attached the rotary coded plate thereon upon the output shaft from the one end, while interposing a clearance gauge between the stationary coded plate and the rotary coded plate and fixing same, to thereby set a clearance between the stationary coded plate and the rotary coded plate.
Furthermore, the present invention provides a motor having a pulse encoder attached thereto by the above method.
According to the above-mentioned method, the stationary coded plate can be centrally aligned by pushing same in one radial direction of the circular track pattern, and then the relative positioning of the rotary coded plate and the stationary coded plate can be accurately achieved by only the steps of, putting the clearance gauge on the stationary coded plate position
REFERENCES:
patent: 4604521 (1986-08-01), Takekoshi et al.
patent: 4737635 (1988-04-01), Uchida
patent: 4775787 (1988-10-01), Ushiyama et al.
patent: 4794250 (1988-12-01), Togami
patent: 4833316 (1989-05-01), Yoneda
Ushiyama Shigeyuki
Yamamoto Tomonaga
Allen Stephone B.
Fanuc Limited
Nelms David C.
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