| 摘要 |
A method and apparatus for permanently controlling movement of a web of material, which is being continuously supplied to a machine which operates sequentially on a portion of the web as each portion is at a standstill, characterized by using an apparatus including a feeder for feeding the web at a continuous rate of speed and a web take-up device for engaging the web as it exits the feeder to absorb the web being supplied by the feeder for a period of time that the portion of the web is being acted on by the machine and is in a stationary position or at a standstill. The web take-up device includes a pair of members mounted in a pair of spaced side frames for rotation on a first axis, a roller engaging a portion of the web and a structure for mounting the roller on the pair of members for rotation on a second axis offset from the first axis. The structure for mounting the roller includes a control screw for varying the amount of offset of the second axis from the first axis with the improvement comprising a counterweight for equilibrating the weight of the roller and a cam and lever arrangement for varying the angular position of the second axis of the roller during rotation of the pair of members on the first axis at a rate dependent on the amount of offset between the first and second axis so that the portion of the web within the machine is at a standstill for a predetermined period of time.
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