| 摘要 |
<p>A method of making a mattress web comprising two fabric webs which are attached to one another in the transverse direction by seams that are spaced apart in the longitudinal direction, thereby to form sleeves, each of which contains a slightly tensioned spring. One of the fabric webs is continuously conveyed in its longitudinal direction in such a manner as to be supported from below, and a curve is formed in the transverse direction of the web, the curve opening facing upwards. A spring is introduced into the curve through the opening thereof, the spring being non-tensioned and having a height exceeding the curve depth. In the curve, the spring is compressed in the vertical direction under the action of a force acting at a distance from the downstream wall of the curve, and the curve with the compressed spring therein is brought together with the other fabric web, which is continuously conveyed in its longitudinal direction. The other fabric web is attached to the downstream edge of the curve, and the spring-compressing force is cancelled while the top fabric is kept close to the opening of the curve. A machine for implementing the method comprises: an endless conveyor (1) which has an essentially horizontal run and which substantially consists of equidistant and parallel grooves (5) extending transversely of the direction of conveyance; means for stepwise propelling of the conveyor by the width of a groove; means (45, 47) for feeding a mattress bottom fabric (L) to the horizontal run of the conveyor, such that an upwardly open curve of this fabric is formed in the groove; and means (15, 16; 28, 32, 33; 40; 41, 42) for performing the steps described above with regard to the method.</p> |
