With its larger needlebar stroke, larger lift of the presser foot, and newly adopted double-tension mechanism, the machine sews beautifully with thick threads (low count thread) and at higher thread tensions. This allows the machine to sew a broad range of heavy materials.
* The LS-1340 is provided with a single-tension mechanism

The ratio of alternate vertical movement remains unchanged even when the material thickness changes.The slimmed-down throat plate easily responds to the sewing of small tubular articles with diameters as small as φ40mm.
This enhances the machine's ability to smoothly sew not only bags and shoes, but also small articles such as walletsThe throat plate and feed dog are provided with a gauge that offers an excellent capability for the sewing of sharp curves. These gauges are especially useful for the sewing of curves of bags and leather cases.

Click on link below for full details from Juki website

1341 pdf brochure