Abstract: A mattress covering sewing machine has a pair of upper and lower support means on which a cushion is wrapped with a box-like outer cover and outer cover disposed under the open end of the box-like outer cover. The upper support means is adapted to be lowered so that the wrapped cushion is uniformly compressed in a direction of thickness of the wrapped cushion so as to permit the outer marginal edge portions of the adjacent outer covers to be sewn together. A sewing device is adapted to be moved around the entire outer marginal portions of the adjacent outer covers.

Abstract: A mattress covering sewing machine includes a pair of upper and lower support plates for supportingly sandwiching therebetween a cushion wrapped with a pair of box-like outer covers. The support plates have outer peripheral portions extending in a manner to correspond to the shape of the outer peripheral portion of the cushion and coming into contact with the outer peripheral portion of the cushion through the box-like outer cover. The upper plate is mounted to be vertically movable so that the cushion is automatically and uniformly compressed in a direction of thickness of a cushion to permit the outer marginal edge portions of the adjacent box-like covers to be projected outward. The outer marginal edge portions of the adjacent box-like covers are sewn together to provide a mattress. The sewing device can be moved around the entire outer marginal edge portions of the adjacent box-like outer covers.