| 摘要 |
A pen includes a housing having a slot, an ink reservoir received in the housing, and a sheet material received in the housing and movable out of the housing via the slot of the housing for noting purposes. The housing includes a rotatable tube, and the sheet material may be wound around the tube, and a casing may be rotatably attached to the housing and coupled to the tube, to rotate the tube relative to the housing and thus to move the sheet material relative to the housing. The housing includes an anchor device engaged with the tube with such as teeth engagements to guide the tube to rotate relative to the housing.
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