A needle bar mechanism includes a needle bar connecting stud, two needle bars, needle bar clutches, clutch levers, needle bar clutch stoppers, and deactivating members provided two by two at the stud; a slider configured to selectively collide with one clutch lever and one deactivating member at the time of lifting of the stud; and an interlocking mechanism configured to interlock the deactivating members such that the deactivating members move opposite to each other in an upper-to-lower direction. According to the needle bar mechanism, the slider comes, at the time of lifting of the stud, into collision with the clutch lever and the deactivating member, so that one needle bar clutch can be switched from a holding state to a release state by the stud while the other needle bar clutch is switched from the release state to the holding state by the stud.

Disclosed is an ornamental chain stitching head, including: an upper head assembly, the upper head assembly controls movement of a needle bar and a walking foot mechanism; a walking foot eccentric configured to allow adjustment of a foot lift while a stitch length eccentric is configured to allow for adjustment of both a walking foot and a needle bar advancement via regulation of a rock frame the determines a length of a stitch created by the ornamental chain stitching head; a lower head assembly; and a needle bar cam assembly that drives rotation of the needle bar during each stitch cycle of the ornamental chain stitching head to achieve desired stitch patterns, the needle bar cam assembly is driven directly by an upper shaft through a pair of gears that reduce the needle bar cam assembly speed according to a size ratio of the pair of gears.

A needle bar mechanism includes a needle bar connecting stud, two needle bars, needle bar clutches, clutch levers, needle bar clutch stoppers, and deactivating members provided two by two at the stud; a slider configured to selectively collide with one clutch lever and one deactivating member at the time of lifting of the stud; and an interlocking mechanism configured to interlock the deactivating members such that the deactivating members move opposite to each other in an upper-to-lower direction. According to the needle bar mechanism, the slider comes, at the time of lifting of the stud, into collision with the clutch lever and the deactivating member, so that one needle bar clutch can be switched from a holding state to a release state by the stud while the other needle bar clutch is switched from the release state to the holding state by the stud.

Disclosed is an ornamental chain stitching head, including: an upper head assembly, the upper head assembly controls movement of a needle bar and a walking foot mechanism; a walking foot eccentric configured to allow adjustment of a foot lift while a stitch length eccentric is configured to allow for adjustment of both a walking foot and a needle bar advancement via regulation of a rock frame the determines a length of a stitch created by the ornamental chain stitching head; a lower head assembly; and a needle bar cam assembly that drives rotation of the needle bar during each stitch cycle of the ornamental chain stitching head to achieve desired stitch patterns, the needle bar cam assembly is driven directly by an upper shaft through a pair of gears that reduce the needle bar cam assembly speed according to a size ratio of the pair of gears.