Automatic quality control system
AssigneesToyota Jidosha Kokyo Kabushiki Kaisha, Toyota Jidosha Kokyo Rabushiki Kaisha
InventorsHisaji Nakao, Nobuo Fukuma, Hideyuki Matsubara, Tadahiro Takasu, Takao Yoneda
Life of this patent
Estimating the term…
Abstract
An automatic quality control system for a machine which measures workpieces processed by the machine. An estimated value to be obtained from an unprocessed workpiece depending upon information obtained from previously processed workpieces is calculated and is compared with a predetermined control limit. An instruction signal is generated when the estimated value is beyond the control limit to indicate a need for adjustment of the machine.
Claims13
An automatic quality control system for a machine for processing discrete workpieces wherein a parameter of processed workpieces varies in accordance with a trend comprising:
- measuring means separately disposed from said machine for generating information by measuring a plurality of workpieces processed thereby;
- converting means for converting information obtained from said processed workpieces into digital values;
- computing means responsive to said converting means for calculating by trend processing an estimated value for a yet unprocessed workpiece depending upon said digital values obtained from a plurality of preceding workpieces, for comparing said estimated value with a predetermined control limit and for generating an instruction signal when said estimated value is beyond the control limit;
- and
- instruction means for indicating a need of adjustment of said machine in response to said instruction signal.
An automatic quality control system for a machine for processing discrete workpieces wherein a parameter of successively processed workpieces varies in accordance with a trend comprising:
- measuring means separately disposed from said machine for generating information by measuring a plurality of workpieces processed thereby;
- converting means for converting information obtained from said processed workpieces into digital values;
- computing means for trend processing the digital values obtained from a plurality of said preceding workpieces;
- instruction means for indicating a need of adjustment of said machine in response to said computing means;
- said computing means operating to store measured values obtained from the processed workpieces, to calculate by trend processing the trend of said measured values, to calculate by trend processing an estimated value for a yet unprocessed workpiece in accordance with said trend, to determine if said estimated value is within predetermined control limits and to instruct adjustment of said machine when said estimated value is beyond said control limits.
Dependencies are inferred from the claim text.