同样五道工序，为什么直线布局让人多走一大圈？Same five operations—why does a straight line make the operator walk farther?
丰田把分散的设备按产品流程排成 U 型，让入口和出口留在同一侧。作业员在内圈巡回，一个人就能照看多台设备；需求变化时再按节拍增减人员，这就是“少人化”。U 型不是为了摆得好看，而是为了少走动、能一人多机、还能弹性配员。Toyota arranged equipment around the product flow in a U, keeping in-feed and out-feed on the same side. One operator can walk the inside loop and tend several machines; staffing can then flex up or down with Takt. The U is not a styling choice. It cuts walking, enables multi-machine work, and makes staffing flexible.
💡 跑完看数据：U 型省掉的是每一圈的回头路💡 Run it, then read the numbers: the U removes the long return walk on every loop
两布局使用同一 DES、同一步速与加工时间Both layouts use the same DES, speed, and process time| 配员Staff | 直线 · 距离 / 产量Straight · distance / output | U 型 · 距离 / 产量U-cell · distance / output | 少走Less walking | 多产Output gain |
|---|---|---|---|---|
| 1 人1 op | — | — | — | — |
| 2 人2 ops | — | — | — | — |
走动时间计入周期：每道工序加工 2 秒，作业员必须走到下一站才能继续。直线布局做完第 5 道还要从末端走回入口；U 型把出入口放在同一侧，回程明显缩短。2 人模式共用设备，等待时间也由 stats() 记录。Walking is part of cycle time: each operation takes two seconds, and the operator must reach the next station before work can continue. A straight line sends the operator from the last station all the way back to in-feed; a U puts out-feed beside in-feed and shortens that return. In two-operator mode, shared-machine waiting is also recorded by stats().
按产品流程摆设备，让出入口同侧；U 型是为了少走动和一人多机，不是为了画一个 U。Arrange equipment around product flow and keep in-feed beside out-feed. The U exists to cut walking and enable multi-machine work—not to draw a letter.