Traitement en cours

Veuillez attendre...

Paramétrages

Paramétrages

1. EP0215127 - APPAREIL DE DETECTION DE LA POSITION D'UNE MACHINE.

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique
Claims

1. A device for sensing the position of a movable machine part (2), which is driven by a motor (1), through use of pulses available from a position sensor (3) mounted on the motor (1) directly or indirectly, comprising:
   counting means (4) for counting the pulses from the position sensor (3);
   readout means (5) for reading out the count value of the counting means (4) at predetermined time intervals; and
   cancel means (6) for cancelling the contents of the counting means (4) by a value equal to the count value read out by the readout means (5); the device being characterized by:
   backlash amount storage means (7) for storing a preset amount of backlash;
   amount-of-movement computing means (8) for computing the actual amount of movement of the movable machine part (2) for each said predetermined period of time on the basis of the count value read out by the readout means (5) and the amount of backlash obtained from the backlash amount storage means (7); and
   integrating means (9) for integrating the amount of movement computed by the amount-of-movement computing means (8);
   wherein the amount-of-movement computing means (8) comprises:
   backlash discharge storage means (61) for storing the current amount of backlash discharge relative to the movement of the movable machine part (2) in a predetermined direction;
   adding means (60) for adding the stored value of the backlash discharge storage means (61) and the count value read out by the readout means (5);
   subtracting means (63) for subtracting the amount of backlash from the output value of the adding means (60);
   first polarity discriminating means (65) for discriminating the polarity of the output of the adding means (60);
   second polarity discriminating means (64) for discriminating the polarity of the output of the subtracting means (63);
   amount-of-movement outputting means (66,67,69) for outputting either one of the outputs of the adding means (60) and the subtracting means (63) to the integrating means (9) in dependence upon the results of discrimination by the first and second polarity discriminating means (65,64); and
   updating means (68 and 70 to 75) for updating the stored value of the backlash discharge storage means (61) on the basis of the results of discrimination by the first and second polarity discriminating means (65,64), the output of the adding means (60), the preset amount of backlash, and a preset value issued by a constant setting circuit (70).