| 摘要 |
Three elongated strips (called a web and two legs) are assembled into an elongated channel by a machine which includes a supply table. A stack of webs on the supply table feed downward by gravity. Legs are fed inwardly under the webs by pusher arms. The web and two legs are fed from the back to the front of the machine by a three-fingered lug on a continuous chain operated under the web magazine. Glue is applied to the top of the legs, then the web and two legs are pressed together over a spacer block, where they are stapled together to hold them in place until the glue sets.
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