Wide-range inner diameter paper tube clamping mechanism for printer

The utility model discloses a wide-range inner diameter paper tube clamping mechanism for a printer, which comprises a thermal transfer ribbon winding shaft, at least one group of tensioning structure is arranged on the thermal transfer ribbon winding shaft, the tensioning structure comprises at least two groups of mounting structures, the mounting structures are uniformly distributed on the thermal transfer ribbon winding shaft by taking the axis of the thermal transfer ribbon winding shaft as a reference, and the mounting structures are arranged on the thermal transfer ribbon winding shaft. The mounting structure comprises a mounting plane arranged on the periphery of the thermal transfer ribbon winding shaft, an elastic piece is arranged on the mounting plane, and the elastic piece comprises a mounting plate used for being mounted on the mounting plane, a contact plate and a connecting plate used for connecting the contact plate and the mounting plate. According to the utility model, at least two groups of