Method of sequential monitoring and apparatus for practicing the same
AssigneeFuji Photo Film Co., Ltd.
InventorsTetsuji Nagai, Katura Torii, Yoshio Ohno
Life of this patent
Estimating the term…
Abstract
A production line has a plurality of working groups in which work operations are controlled by a sequential controller. Detectors are provided in each working group of the production line to output signals to a microcomputer. The microcomputer makes sequence patterns for each working group based on data comprised by the signals from the detectors with respect to the order of outputting and the time intervals of the signals. During monitoring, the microcomputer compares signals from the detectors with the corresponding sequence pattern for each working group to monitor the working conditions of the working groups.
Claims15
A method of sequential monitoring for monitoring a production line which includes working groups whose work operations are controlled by a sequential controller, comprising the steps of:
- receiving electrical signals from detectors, one of said detectors being provided in each of a plurality of working groups distributed along a said production line, each of said working groups performing a different plurality of work operations;
- storing first data generated from said received signals and representative of the order of outputting and the time intervals of said electrical signals;
- producing a sequence pattern based on said stored first data and representative of a sequence of work operations performed within at least one of said working groups as well as representative of a time interval within which each of said work operations has been performed a plurality of times;
- and
- monitoring the working conditions of said plurality of working groups by comparing said sequence pattern with said electrical signals received after producing said sequence pattern.
Sequential monitoring apparatus for monitoring a production line including working groups, comprising:
- a detector provided in each of a plurality of working groups each of which groups includes a different plurality of work operations distributed along a said production line so as to output various kinds of electrical signals representing each work operation;
- means for producing a sequence pattern based on said electrical signals and representative of a sequence of work operations performed within at least one of said working groups as well as representative of a time interval within which each of said work operations has been performed a plurality of times;
- and
- means for monitoring the working conditions of the working groups by comparing said sequence pattern with said electrical signals generated after producing said sequence pattern.
Sequential monitoring apparatus for monitoring a production line including working groups, comprising:
- a detector provided in each of a plurality of working groups including a different plurality of work operations distributed along a said production line so as to output various kinds of electrical signals representing each work operation;
- means for producing a sequence pattern from the order of outputting and the time intervals of said electrical signals, said sequence pattern representing a sequence of work operations performed within at least one of said working groups as well as representative of a time interval within which each of said work operations has been performed a plurality of times;
- means for storing said sequence pattern;
- and
- means for monitoring the working conditions of said production line by comparing said stored sequence pattern with said electrical signals generated after producing said sequence pattern.
Dependencies are inferred from the claim text.