Boots – shoes – and leggings
Patent
1993-10-22
1995-08-29
Envall, Jr., Roy N.
Boots, shoes, and leggings
364402, G06F 1760
Patent
active
054466717
ABSTRACT:
This invention is a look-ahead method for determining optimum production schedules for each production step based on factory-wide monitoring of in-process part queues at all potential production bottlenecks. For each product having associated therewith a throughput bottleneck, a maximum queue quantity Q.sub.MAX and a minimum queue Q.sub.MIN quantity are assigned. When a machine completes a lot of a particular product at a production step P that proceeds the bottleneck step B, the look-ahead method is initiated. The queue at step P is searched and the next lot to be processed is selected. If that lot is a product for which Q.sub.MAX and Q.sub.MIN values have been assigned at step B, then the queue quantity at step B is determined. If, on one hand, the queue quantity at step B is less than Q.sub.MAX, or between Q.sub.MAX and Q.sub.MIN and the queue quantity is climbing upward from a sub-Q.sub.MIN value and has not yet exceeded its Q.sub.MAX value, then the lot is processed without further analysis. If, on the other hand, the queue quantity at step B is greater than Q.sub.MAX , or between Q.sub.MAX and Q.sub.MIN and the queue quantity is descending from a quantity greater than its Q.sub.MAX and has not yet fallen below its Q.sub.MIN value, then that product has a set flag status associated therewith, and the lot will not be processed until after all other lots which have a clear flag status are processed.
REFERENCES:
patent: 4309600 (1982-01-01), Perry et al.
patent: 4888692 (1989-12-01), Gupta et al.
patent: 5229948 (1993-07-01), Wei et al.
Allison Ruth A.
Clemons Jeanne M.
Durham Douglas S.
Hope Keven A.
Metsker Grace G.
Envall Jr. Roy N.
Garland Steven R.
Micron Semiconductor Inc.
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