Just In Time as A Control Techniques (Part 3)

Just In Time
i.e: uniform loading, repetitive process, pull system, using production cards, and synchronized production.

  • Pull System
JIT control pulls material from previous workstations. Since only consumed material is produced, the inventories between workstations never accumulate. The workstation replenishes materials consumed by its following workstation. The first workstation of the factory is the supplier. And the last workstation is the customers. Customers pull the product from the factory and the factory pulls materials from suppliers.

  • Uniform Loading
The loads for jobs in every workstation are equal. This makes the pull system possible. Uniform loading allows the material to flow through the system smoothly. Every workstation run at a constant rate.

  • Production Card
The various color, shapes, or special code in the card are used to transmit production signals. During the process, the card is usually attached or detached from materials. Sometimes, container or the material itself are themselves the signals.

  • Synchronized Production


Production activities In each workstation are synchronized with a certain control signal. The production rates in workstation are related to each other, and the work-in-process is limited to a predetermined level. It can be seen in JIT environments or TOC (theory of constraint) environment. A control signal is carried by kanbans in a JIT environment. DBR (drum buffer rope) is used to synchronize the workstations in TOC environment. 

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