Sewing machine needle bar changing device

摘要

A sewing machine needle bar changing device includes a needle bar case having multiple needle bar holes, each of which receives a needle bar and has at least one longitudinal slide way formed on one side thereof; a needle bar case holder located at one side of the needle bar case and having a control guide way, which is engaged with the needle bars and has a longitudinal opening; a needle bar guide member engaged with one needle bar that is moved to a sewing position to align with the longitudinal opening, and brought by a crank link of the sewing machine to move upward and downward synchronously with the engaged needle bar; and a driving mechanism for moving and then holding a selected needle bar to the sewing position. All other needle bars not in the sewing position are restricted by the control guide way from moving axially.

主权项

1. A sewing machine needle bar changing device, comprising:
a cylindrical needle bar case having
longitudinal slide ways,a pivoting section, anda plurality of spaced needle bar holes on a portion of the needle bar case so as to be circumferentially arrayed, each of the needle bar holes having on at least one side thereof at least one of the longitudinal slide ways which communicates the needle bar hole with an external space; a cylindrical needle bar case holder being located at one side of the cylindrical needle bar case and having a control guide way formed thereon, the control guide way having a longitudinal opening, and facing towards each of the longitudinal slide ways; a plurality of needle bars being received in the needle bar holes in a one-to-one correspondence and each carrying a needle, the needle bars in the needle bar holes being engaged with the longitudinal slide ways and the control guide way at a same time so as to both
prevent the needle bars from rotating in the needle bar holes, andlimit axial motion of the needle bars except a first needle bar of the needle bars that is moved to align with the longitudinal opening; a needle bar guide member being engaged with the first needle bar that is moved to align with the longitudinal opening, the needle bar guide member being connected to and brought by a crank link on a sewing machine to move upward and downward; and a driving mechanism connected to the pivoting section for driving the cylindrical needle bar case to display by rotating and providing a locating function, so as to change positions of the needle bar holes relative to the needle bar guide member, so that a selected one needle bar hole of the needle bar holes is selectively rotated to a sewing position, at which the needle bar in the selected one needle bar hole is in line with the longitudinal opening and the needle bar guide member, the needle bar in the selected one needle bar hole that is selected and rotated to the sewing position can be brought by the needle bar guide member to axially move upward and downward synchronously with the needle bar guide member, while all other needle bars of the needle bars that are not located at the sewing position are restricted by the control guide way from axially moving upward and downward.