Brake structure of band reel in packing machine

A brake structure of a band reel in a packing machine which is provided on a reel shaft for being rotated integrally with the band reel, comprising:

• a brake arm positioned on one end of the reel shaft, the brake arm having a coil spring portion provided on one end and a band passing ring portion provided on another end, wherein the coil spring portion is integral with said brake arm, and wherein the one end of the brake arm having the coil spring portion is fastened to a fixed member, whereby
• when a band inserted through the band passing ring portion of the brake arm is sent toward a packing machine body side, the coil spring portion receives a force in a direction of an increase in a diameter of the coil spring portion by a force applied from the fed band causing the coil spring portion to diametrically expand to form a clearance between an outer periphery of the reel shaft and an inner periphery of the coil spring portion, and
• when the force applied from the fed band is released, the diameter of the coil spring portion is reduced to closely engage the inner periphery of the coil spring portion with the outer periphery of the reel shaft, thereby stopping a rotation of the reel shaft by frictional force.