An automatic knot-tying device 10 is provided, comprising a line feeder 14 configured to supply line 8, a line tensioner 16 configured to apply tension to the line, and a line operation
assembly 18 configured to operate the line so that line 8 is operably supplied from the feeder 14 and to tie knots 12 such as dropper loops. The device 10 further includes at least one knot sensor 20 configured to sense knots tied to the line, a line collector 22 configured to collect the line on which the knots are tied, and a controller 24 positioned to
signal-communicate with the line feeder 4, line tensioner 16, line operation
assembly 18, knot sensor 20, and line collector 22, and configured to monitor and control the line feeder 4, line tensioner 16, line operation
assembly 18, knot sensor 20, and line collector 22 in order to automatically and continuously tie separated knots along the line for use as a pattern rig.