Tractor unit, conveyance device, and printer

A tractor unit, comprising:

• a first tractor having first tractor pins configured to be engaged in first sprocket holes formed in continuous paper to be conveyed in a conveyance direction along a first side of the continuous paper;
• a second tractor having second tractor pins configured to be engaged in second sprocket holes formed in the continuous paper along a second side of the continuous paper, the second side opposite the first side across a paper width of the continuous paper;
• a support shaft that extends in a transverse direction perpendicular to the conveyance direction of the continuous paper, and supports the first tractor and second tractor movably in the transverse direction;
• a frame that supports the support shaft movably in the transverse direction;
• a biasing member configured to bias the support shaft in the transverse direction;
• and
• a clamping member configured to fix the second tractor on the support shaft;
• the first tractor being disposed at a predetermined reference position in the transverse direction, and
• in response to a movement of the support shaft in a first direction oriented from the second tractor toward the first tractor, the biasing member configured to bias the support shaft in a second direction opposite the first direction.