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Method and apparatus for controlling product routing in a manufacturing line
| Details |
Inventors: Barker, Brian C.; Bauer, Lawrence R.; Chaloux, Susan E.; Federico, John T.; Hartswick, Perry G.;
Assignee: International Business Machines Corporation (Armonk, NY)
Primary Examiner: Stamber; Eric W.
Assistant Examiner: Vincent; Steven F.
Attorney, Agent or Firm: Ratner & Prestia
In a manufacturing line having a plurality of production jobs performed on a plurality of production units in a plurality of processing areas, a method and related system for selecting a number of production units to be sent to a designated process area other than the plurality of processing areas. |
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DETAILED DESCRIPTION There is provided by the present invention, a method and associated system for selecting a quantity, usually a limited number, of units or lots to go to a designated area, usually for testing or analysis, based on predetermined criteria for the time interval between selections, the maximum quantity of units that can consecutively bypass testing or analysis, and the maximum quantity of units that will be selected in a given time period, for instance in a week.
The present invention also provides overriding ability to ignore the predetermined criteria and divert any arbitrary number, including all units, to the designated area.
More particularly, for a manufacturing line wherein a plurality of production jobs are performed on a plurality of units in a plurality of processing areas, the present invention comprises a method for diverting a number of said plurality of production units to a designated area other than the plurality of processing areas, comprising the steps of: a) counting the number of production units that bypass the designated area beginning every time a production unit is diverted to the designated area, to obtain a unit bypass count; b) counting the number of units diverted to the designated area to obtain a selected unit count; c) measuring a first time interval beginning every time a production unit is diverted to the designated area; d) comparing the unit bypass count, selected unit count and the first time interval to a preset value for each of said unit bypass count, selected unit count and first time interval respectively; and 1) diverting one of said plurality of units to the designated area when the measured first time interval is equal to or greater than the preset value for the first time interval and the selected unit count is less than the preset value for the selected unit count; 2) diverting one of said plurality of units to the designated area when the unit bypass count is equal to or greater than the preset value for the unit bypass count and the selected unit count is less than the preset value for the selected unit count
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Fault Detection 
