According to the Toyota production system, the engine room layout will be rearranged to smooth production flow. Each worker will hold three types of machines. For example:
• one worker would hold a lathe.
• one worker will be a grinding machine.
• one worker will driller at the same time.
This system is called the handling of multiple processes. In other words, workers single function, a concept that is used to apply the factory Toyota, now working as a double function.
In a line of double-handling process, one worker to handle multiple machines of various processes one by one, in each work process will take place only when workers were completing the work assigned to it within the specified cycle. As a result, the entry of each unit into line unit offset by the completion of other end products, as ordered by the operation of a time cycle. Such production is called production and transport of one piece. It can provide the following advantages:
• Since the product is created one by one, we can shorten production time booking it.
• Preparations unnecessary between each process can be eliminated.
• The concept of dual-process workers can reduce the number of workers needed, and thus increase productivity.
• While workers become worker-double function, they can participate in the overall system of a plant and thus feel more comfortable with their work.
• By working as a double-function, every worker knows how to cooperate in a group and help each other.
The concept of the worker or workers-double-double function of such a method is the very nature of Japan.



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