| 摘要 |
As a sheet material such as paper is wrapped onto an axially rotating cylinder, it is pulled through a slot in a member which surrounds a lengthwise portion of the cylinder. Relative motion between the cylinder and member is stopped before all of the sheet is passed through the slot. Then, the cylinder and member may be rotated together for any desired purpose, such as to allow writing on the sheet. The sheet is unwrapped by rotating the cylinder in the reverse direction, while holding the member stationary.
|
