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Web feed tractor for printer

Image Number 4 for United States Patent #4758107.

A web feed tractor for a printer which comprises a timing belt having outer web engaging pins and inner teeth, a sprocket wheel drivingly connected to the belt and having belt engaging cogs and a guide portion, a frame rotatably receiving the sprocket and having a guide portion, a web holding plate assembly pivoted to the frame, and a web support plate connected to the frame and having a lock and a lock ring fitted on the lock.

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