Method for the manufacture of an indicating instrument

Details Method for the manufacture of an indicating instrument Method for the manufacture of an indicating instrument

1993-08-03

1994-08-02

Hall, Carl E.

Metal working

Method of mechanical manufacture

Electrical device making

29593, 318696, G01R 300

Patent

active

053333713

ABSTRACT:
A method is provided for manufacture of an electronically synchronizable indicating instrument the pointer of which can be turned between a zero stop and a scale-end by means of a stepping motor via a multi-step gearing, wherein the stepping motor has a two-pole rotor of magnetizable material, two coils arranged perpendicular to each other, and a housing surrounding the coils, the motor being adapted to be controlled by a microprocessor. The stepping motor is assembled with a non-magnetized rotor, and the instrument includes a gear train, and a pointer having a torsion spring which acts in the direction towards full scale. In the procedure of the method, the pointer is brought to rest against the zero stop by means of a moment of rotation applied from the outside in opposition to the restoring force of the torsion spring. The rotor of the stepping motor is turned in the direction towards the zero stop of the pointer by means of a rotating magnetic field with the carrying along of gear wheels until no gearing play is present any longer. Then, the rotor is held in the position reached, and is magnetized in a predetermined angular direction.

REFERENCES:
patent: 5032781 (1991-07-01), Kronenberg

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