A roll shaft structure is provided for fixing a first roll or a second roll. The roll shaft structure includes a shaft body, a first ring and a second ring. The diameter of the shaft body is equal to the inner diameter of the first roll. The diameter of each of the first ring and the second ring is
A roll shaft structure is provided for fixing a first roll or a second roll. The roll shaft structure includes a shaft body, a first ring and a second ring. The diameter of the shaft body is equal to the inner diameter of the first roll. The diameter of each of the first ring and the second ring is equal to the inner diameter of the second roll. When the shaft body penetrates through the first roll, the shaft body is contacted with the inner wall of the first roll, so that the first roll is fixed on the roll shaft structure. Whereas, when the shaft body penetrates through the second roll, the first ring and the second ring that are fixed on the shaft body are contacted with the inner wall of the second roll, so that the second roll is fixed on the roll shaft structure.
대표청구항▼
1. A roll shaft structure for use in a thermal transfer printer to fix a first roll or a second roll, said first roll having a first roll inner diameter, said second roll having a second roll inner diameter, said second roll inner diameter being greater than said first roll inner diameter, said roll
1. A roll shaft structure for use in a thermal transfer printer to fix a first roll or a second roll, said first roll having a first roll inner diameter, said second roll having a second roll inner diameter, said second roll inner diameter being greater than said first roll inner diameter, said roll shaft structure comprising: a shaft body penetrating through said first roll or said second roll, and comprising a first notch and a second notch;a first ring sheathed around said shaft body and movable with respect to said shaft body, and having a first fixing part, wherein when said first ring is moved to a position between said first notch and said second notch and then said first ring is rotated, said first fixing part is engaged with said second notch, so that said first ring is fixed on said shaft body;a supporting plate arranged at a first end of said shaft body, and having a receiving part for receiving said first ring; anda stopping part arranged at a second end of said shaft body for stopping said first ring and avoiding detachment of said first ring from said shaft body,wherein when said first roll is sheathed around said shaft body, said shaft body is contacted with a first inner wall of said first roll, so that said first roll is fixed on said shaft body, wherein when said second roll is sheathed around said shaft body, said first ring is contacted with a second inner wall of said second roll, so that said second roll is fixed on said shaft body. 2. The roll shaft structure according to claim 1 wherein said first notch further includes a first notch rib, wherein when said first ring is moved to said position between said first notch and said second notch, said first ring is blocked by said first notch rib from being rotated in a first rotating direction but said first ring is permitted to rotate in a second rotating direction opposed to said first rotating direction, so that said first fixing part is engaged with said second notch and said first ring is fixed on said shaft body. 3. The roll shaft structure according to claim 2 further comprising a second ring, which is sheathed around said shaft body and movable with respect to said shaft body and has a second fixing part, wherein when said second ring is moved to said position between said first notch and said second notch and then said second ring is rotated in said second rotating direction, said second fixing part is engaged with said second notch, so that said second ring is fixed on said shaft body. 4. The roll shaft structure according to claim 2 wherein when said second roll is sheathed around said shaft body, said first ring is contacted with said second inner wall of said second roll to fix said second roll on said shaft body, so that said shaft body is synchronously rotated with said second roll in said first rotating direction to prevent disengagement of said first fixing part from said second notch. 5. The roll shaft structure according to claim 1 wherein said shaft body further comprises a first guiding groove, and said first ring is movable with respect to said shaft body along said first guiding groove. 6. The roll shaft structure according to claim 1 wherein said first ring further comprises plural first ring ribs, wherein when said second roll is sheathed around said shaft body, said first ring ribs are contacted with said second inner wall of said second roll, so that said second roll is fixed on said shaft body. 7. The roll shaft structure according to claim 1 wherein said shaft body has a shaft body diameter, and said shaft body diameter is equal to said first roll inner diameter. 8. The roll shaft structure according to claim 1 wherein said first ring has a ring diameter, and said ring diameter is equal to said second roll inner diameter. 9. The roll shaft structure according to claim 1 wherein said first roll is a ribbon roll or a thermal paper roll. 10. The roll shaft structure according to claim 1 wherein said second roll is a ribbon roll or a thermal paper roll.
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