The TN-1710BH machine is a single needle, Post bed, compound feed with walking foot lockstitch sewing machine.  The TN-1760BH machine is a double needle, Post bed, compound feed with walking foot lockstitch sewing machine.   It is equipped with a climbing device that allows the adjustment to the alternation of the upper feed of the machine to climb over different thicknesses of material without using any tools.  This can be done on the "fly" so downtime of the machine due to setup is virtually nil.  Developed from the regular TN-1500 series machine, this 7" high postbed has a working space of 250 mm(10") x 270 mm(10.8") which helps with long or larger workloads.  It is suitable for sewing medium to heavy duty materials, such as sofa, car seats, bags, sports goods, etc.