Abstract: The present invention discloses a multi-needle bar module for sewing machines. Such a multi-needle bar module may be additionally mounted on the existing sewing machines, so that the existing sewing machines may be easily retrofitted into multi-needle bar sewing machines. The multi-needle bar module is not limited to a two-needle bar structure, and may be assembled with three, four or more needle bars according to actual requirements, solving the problem that both the single-needle bar sewing machines and the two-needle-bar sewing machines require manual change of threads in the process of sewing a pattern due to insufficient color varieties of the upper threads. The multi-needle-bar module guides each needle bar via the first horizontal guideway and the second horizontal guideway, and feeds a specific needle bar into the neck of the needle bar driving block via the driving mechanism. Such a multi-needle bar module has the advantages of simple structure and automatic control.

Abstract: The present invention discloses a rubber band machine. The length of a rubber band to be conveyed may be set by controlling the angle of rotation of a first motor. The rubber band input by a first feeding drive wheel is stored between the first feeding drive wheel and a second feeding drive wheel so that the second feeding drive wheel coordinates with a looping device to continue to output the rubber band. During feeding, the rubber band machine can perform joint examination and ironing to the rubber band, and automatically cut the rubber band off at the discharge port of the second feeding drive wheel via a cutting device. The looping device grips the rubber band via a third gripper and moves rotationally to convey two ends of the rubber band to a first gripper and a second gripper, respectively.