Patent ID: 9273423
Filing Date: 2016-03-01
CPC Classification: D05B

Claim Text:
1. A thread routing mechanism for needle-switchable type sewing machine, comprising: a thread take-up lever including a sway control end and a thread take-up end; the sway control end bringing the thread take-up end to move upward and downward, and the thread take-up end being provided with a plurality of thread holes; a cylindrical needle bar case having a rotation axis and a plurality of spaced needle bar holes, and internally defining a hollow space extended from a top to a bottom of the cylindrical needle bar case; the needle bar holes being equally distant from the rotation axis and each having a needle bar received therein; and the needle bars respectively carrying a needle having an eye formed thereon; and a plurality of threads being separately routed through a thread course defined by the thread holes on the thread take-up lever, the hollow space in the cylindrical needle bar case, and the eyes on the needles.