Thread routing mechanism for needle-switchable type sewing machine

摘要

A thread routing mechanism for needle-switchable type sewing machine is installed on a needle bar switching mechanism of the sewing machine, and includes a thread take-up lever, a cylindrical needle bar case and a plurality of threads. The thread take-up lever includes a sway control end and a thread take-up end having thread holes. The cylindrical needle bar case has a rotation axis and a plurality of spaced needle bar holes, and internally defines a hollow space. The needle bar holes are equally distant from the rotation axis, and each receives a needle bar therein. The needle bars respectively carry a needle having an eye formed thereon. The threads are separately routed through a thread course defined by the thread holes, the hollow space and the needle eyes, such that the length of the threads in the thread course maintains same without being affected by a needle bar switching operation.

主权项

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.