| 摘要 |
PROBLEM TO BE SOLVED: To provide a continuous pocket coil spring row in which projections unnecessary for contour are not formed, and provide its manufacturing apparatus.SOLUTION: A continuous pocket coil spring row is formed in a row by storing one coil spring 2 in one bag of continuous cylindrical bags 10 formed in a pocket shape by a strip-shaped sheet material 1 having breathability. The continuous cylindrical bag 10 is structured such that the coil spring 2 is contained in a space formed by folding the strip-shaped sheet material 1 from both sides in the width direction. The continuous cylindrical bag is welded along the width direction at a predetermined pitch along the longitudinal direction of the strip-shaped sheet material 1 and is formed by welding the longitudinal ends together obtained by folding the strip-shaped sheet material 1. The longitudinal ends are characterized in that a first longitudinal end 1a folded from one side of the width direction and a second longitudinal end 1b folded from the other side of the width direction are welded together in an overlaid state for the top and bottom plane, and the welding position is positioned in the central part of the width direction.SELECTED DRAWING: Figure 1 |
