Synchronous control system

Claim 2

A synchronous control system for effecting a synchronous and superimposed operation among different channels of a multi-channel-control machine tool having servomotors, characterized in that a third follow-up error amount of a servomotor responsive to a superimposing instruction is simulated, a difference is determined by subtracting the third follow-up error amount to the superimposing instruction from a second follow-up error amount of a servomotor for a superimposed operation axis and said difference is compared with a first follow-up error amount of a servomotor for a synchronous operation axis to produce a comparison result, and determining an alarm condition when the operation of the servomotors is synchronized and superimposed based on the comparison result.

Claim 3

A synchronous control system according to claim 1, wherein said synchronous control system includes servomotor control circuits having processors for calculating said difference and said comparison.

Claim 4

A synchronous control system according to claim 2, wherein said servomotor control circuits are digitally controlled.

Claim 7

A method according to claim 4, wherein said method further comprises the step of (f) producing an alarm signal based upon said comparing in step (e).

Claim 8

A method according to claim 5, wherein step (f) produces an alarm signal if said comparing in step (e) indicates that the difference is not within a predetermined threshold of the first follow-up error amount.

Claim 9

A method according to claim 4, wherein said method further comprises step (f) determining a synchronous error resulting from the synchronous and superimposed operation based on said comparing in step (e).

Claim 10

A synchronous control system for a multi-channel machine tool having servomotors capable of performing a superimposed axis operation instruction and a synchronous axis operation instruction, said system comprising: first servomotor means for controlling the multichannel machine tool along a synchronous operation axis and for outputting a first feedback signal; first calculation means for subtracting the first feedback signal from the synchronous axis operation instruction to produce a first follow-up error amount of said first servomotor for the synchronous operation axis; second servomotor means for controlling the multichannel machine tool along a superimposed operation axis and for outputting a second feedback signal; addition means for adding the synchronous axis operation instruction and the superimposed axis operation instruction to produce a superimposed instruction; second calculation means for subtracting the second feedback signal from the superimposed instruction to produce a second follow-up error amount of a second servomotor for the superimposed operation axis; simulation means for simulating a third follow-up error amount corresponding to independent movement of a simulated servomotor responsive to the superimposed axis operation instruction for the superimposed operation axis; third calculation means for calculating a difference between the second follow-up error amount and the third follow-up error amount; and comparison means for comparing the difference calculated by said third calculation means with the first follow-up error amount.

Claim 11

A synchronous control system for a multi-channel machine tool having servomotors capable of performing a superimposed axis operation instruction and a synchronous axis operation instruction, said system comprising: first servomotor means for controlling the multichannel machine tool along a synchronous operation axis and for outputting a first feedback signal; first calculation means for subtracting the first feedback signal from the synchronous axis operation instruction to produce a first follow-up error amount of said first servomotor for the synchronous operation axis; second servomotor means for controlling the multichannel machine tool along a superimposed operation axis and for outputting a second feedback signal; addition means for adding the synchronous axis operation instruction and the superimposed axis operation instruction to produce a superimposed instruction; second calculation means for subtracting the second feedback signal from the superimposed instruction to produce a second follow-up error amount of a second servomotor for the superimposed operation axis; simulation means for simulating a third follow-up error amount corresponding to independent movement of a simulated servomotor responsive to the superimposed axis operation instruction for the superimposed operation axis; third calculation means for calculating a difference between the second follow-up error amount and the third follow-up error amount; and comparison means for comparing the difference calculated by said third calculation means with the first follow-up error amount.

Claim 12

A system according to claim 8, wherein said comparison means produces an alarm signal based upon the comparing by said comparison means.

Claim 13

A system according to claim 9, wherein said comparison means produces an alarm signal if the comparing indicates that the difference is not within a predetermined threshold of the first follow-up error amount.

Claim 14

A system according to claim 8, wherein the difference represents an estimated follow-up error of the synchronous operation axis.

Claim 15

A method according to claim 11, wherein said comparison means determines a synchronous error based on the comparing by said comparison means.