Apparatus and a method for controlling the release of jobs from a pool of pending jobs into a factory

Claim 3

The method of claim 1, wherein said continuity index calculating step comprises the step of calculating the mathematical formula: ##EQU4##

Claim 4

The method of claim 1, wherein said mean continuity index calculating step comprises the steps of: calculating the time distribution of the continuity indices of all jobs processed by said factory in a predetermined period of time; and using the mean of said time distribution as said mean continuity index.

Claim 5

The method of claim 3, wherein said mean continuity index MCI is calculated by the mathematical formula: ##EQU5## where N is the number of jobs-in-progress processed by said factory in said predetermined period of time.

Claim 6

The method of claim 1, wherein said range calculating step comprises the steps of: calculating the relationship of said management objectives to different range (r) values; selecting as said range (r) the value (r*) which results in maximizing the management objectives.

Claim 7

The method of claim 1, wherein: said mean continuity index calculating and said range calculating steps are performed once; and said continuity index calculating and job releasing steps are performed repeatedly whenever it is desired to make a decision to release a job into said factory.

Claim 8

The method of claim 1, wherein said mean continuity index calculating step is performed whenever said operational parameter of said factory changes substantially.

Claim 9

The method of claim 1, wherein said range calculating step is performed whenever said management objectives change substantially.

Claim 10

Apparatus for controlling the release of jobs from a pool of pending jobs into a factory including a plurality of machines processing jobs-in-progress, comprising: a job release scheduler for controlling release of a job from the pool of pending jobs into the factory, said job release scheduler having inputs connected to the machines and other components of the factory relating to an amount of time required to process a job in the factory and an amount of time anticipated to complete the job within the factory including waiting time at the machines; means for calculating a continuity index (CI) for one of the jobs in said pool of pending jobs, said continuity index being related to the total amount of processing time required by said one of said pending jobs, and the anticipated time to complete said one of said pending jobs; means for calculating a mean continuity index (MCI) related to an operational parameter of said factory according to management objectives for processing and completing a job in said factory; means for calculating a lower range (r1) and an upper range (r2) related to said management objectives; and means for operating said job release scheduler for releasing said one of said jobs into said factory if: MCI-r1<CI<MCI+r2.

Claim 11

Apparatus for controlling the release of jobs from a pool of pending jobs into a factory including a plurality of machines processing jobs-in-progress, comprising: a job release scheduler for controlling release of a job from the pool of pending jobs into the factory, said job release scheduler having inputs connected to the machines and other components of the factory relating to an amount of time required to process a job in the factory and an amount of time anticipated to complete the job within the factory including waiting time at the machines; means for calculating a continuity index (CI) for one of the jobs in said pool of pending jobs, said continuity index being related to the total amount of processing time required by said one of said pending jobs, and the anticipated time to complete said one of said pending jobs; means for calculating a mean continuity index (MCI) related to an operational parameter of said factory according to management objectives for processing and completing a job in said factory; means for calculating a lower range (r1) and an upper range (r2) related to said management objectives; and means for operating said job release scheduler for releasing said one of said jobs into said factory if: MCI-r1<CI<MCI+r2.

Claim 12

The apparatus of claim 9, wherein said continuity index calculating means comprises means for calculating the mathematical formula: ##EQU6##

Claim 13

The apparatus of claim 9, wherein said mean continuity index calculating means comprises: means for calculating the time distribution of the continuity indices of all jobs processed by said factory in a predetermined period of time; and means for using the mean of said time distribution as said mean continuity index.

Claim 14

The apparatus of claim 9, wherein said mean continuity index calculating means comprises means for calculating the mathematical formula: ##EQU7## where N is the number of jobs-in-progress processed by said factory in said predetermined period of time.

Claim 15

The apparatus of claim 9, wherein said range calculating means comprises: means for calculating the relationship of said management objectives to different range (r) values; means for selecting as said range (r) the value which results in maximizing the management objectives.

Claim 16

A factory for processing jobs-in-progress, and producing completed work, said factory comprising: a plurality of machines, at least one of which includes a waiting queue of jobs to be processed thereat, said at least one machine providing status information relating to its respective waiting queue; a source of jobs in a pool to be processed in the factory, and job storing means for storing the pool of pending jobs to be processed; a job release scheduler for controlling release of jobs from the pool of pending jobs into the factory, said job release scheduler receiving said waiting queue status information from said at least one machine in order to determine amounts of time required to process jobs in the factory and amounts of time anticipated to complete jobs within the factory including waiting time at the machines; means for calculating continuity indexes (CI) for the jobs in said pool of pending jobs, said continuity indexes being related to the amount of processing time required by the pending jobs, and the anticipated time to complete the pending jobs; means for producing selection information for selecting an order of jobs to be released into the factory; means for providing job release criteria according to management objectives for processing and completing jobs in said factory, including a mean continuity index (MCI) related to an operational job release parameter of said factory and a lower range (r1) and an upper range (r2) for said mean continuity index; and means, responsive to said machine waiting queue status information, said job storing means, said means for calculating continuity indexes, said means for producing selection information, and said means for providing job release criteria, for operating said job release scheduler for releasing said pending jobs into said factory when said continuity indexes (CI) satisfy the following relation: MCI-r1<CI<MCI+r2.

Claim 17

A factory for processing jobs-in-progress, and producing completed work, said factory comprising: a plurality of machines, at least one of which includes a waiting queue of jobs to be processed thereat, said at least one machine providing status information relating to its respective waiting queue; a source of jobs in a pool to be processed in the factory, and job storing means for storing the pool of pending jobs to be processed; a job release scheduler for controlling release of jobs from the pool of pending jobs into the factory, said job release scheduler receiving said waiting queue status information from said at least one machine in order to determine amounts of time required to process jobs in the factory and amounts of time anticipated to complete jobs within the factory including waiting time at the machines; means for calculating continuity indexes (CI) for the jobs in said pool of pending jobs, said continuity indexes being related to the amount of processing time required by the pending jobs, and the anticipated time to complete the pending jobs; means for producing selection information for selecting an order of jobs to be released into the factory; means for providing job release criteria according to management objectives for processing and completing jobs in said factory, including a mean continuity index (MCI) related to an operational job release parameter of said factory and a lower range (r1) and an upper range (r2) for said mean continuity index; and means, responsive to said machine waiting queue status information, said job storing means, said means for calculating continuity indexes, said means for producing selection information, and said means for providing job release criteria, for operating said job release scheduler for releasing said pending jobs into said factory when said continuity indexes (CI) satisfy the following relation: MCI-r1<CI<MCI+r2.

Claim 18

The factory of claim 14, wherein said selection information producing means comprises a computer.

Claim 19

The factory of claim 14, wherein said order storing means comprises a data base stored on a computer.

Claim 20

The factory of claim 14, wherein said selection information producing means and said order storing means are comprised on the same computer.

Claim 21

The factory of claim 14, wherein said machines are controlled by a computer system directly connected to said information producing means and order storing means computer.