Patent ID: 8851663

Claim:
A tractor unit that conveys continuous paper by sequentially engaging engagement pins in feed holes formed along the length of both sides of the width of continuous paper and moving the engagement pins, comprising: a first tractor and a second tractor that each have an endless belt having a plurality of engagement pins formed on the outside circumference surface, and a drive pulley and follower pulley on which the endless belt is mounted, and hold the continuous paper on opposite sides of the paper width with the engagement pins engaged in the feed holes; a drive shaft that extends perpendicularly to the conveyance direction of the continuous paper, supports the first tractor and second tractor movably perpendicularly to the conveyance direction, and rotationally drives the drive pulley; a support shaft that is disposed parallel to the drive shaft in the conveyance direction, supports the first tractor and second tractor movably perpendicularly to the conveyance direction, and rotatably supports the follower pulley; a clamping mechanism that holds the first tractor in a fixed position on the support shaft; and a frame that supports the drive shaft and the support shaft, and supports the support shaft movably perpendicularly to the conveyance direction.