| 摘要 |
An extensible roll tree for use in apparatus in which continuous sheet material is continually cycled through an operational point from a storage area in which variable lengths of the sheet material are accumulated. The roll tree has two sets of rotatably mounted rolls about which the sheet material is entrained in a manner creating a plurality of stretches of the sheet material between the two sets of rolls. One of the sets of rolls is supported on a movable carriage which is reciprocally movable toward and away from the other set of rolls. A drive motor and a belt are connected to the movable carriage for moving it toward and away from the other set of rolls. This roll tree permits the plurality of stretches of the sheet material between the two sets of rolls to be increased or decreased as desired to accommodate greater or lesser lengths of sheet material in the accumulation area.
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