| 摘要 |
<p>PAPER ROLL WEB SPLICING An elongated transverse paper preparation head is provided which has multiple sides. One side is exposed to the operator and the other two back sides form, with suitable guide members, a guide path for threading alternate leading edges of fresh web to the splicing nip area. A spring bar holds the fresh web to an idler roll upstream of the nip. The fresh web end section is laid across the exposed head side to which a vacuum is applied, and a double faced adhesive tape is applied along the edge portion's exposed face. The edge is then cut off via a knife slot. The fresh web end section is peeled from the exposed vacuumized side of the head and is manually fed along the guide path. Positive air pressure is applied between the said head back side and the web to cause the web and the adhesive portion to be forced away from the head to eliminate interference therebetween. The splicer nip roll axes are disposed in a common plane which has a bridging portion at the nip. The nip roll for the fresh web is adapted to be driven and to have vacuum applied to its surface during said preparation. The construction is such that the fresh web path from the holding spring, across the idler roll and the exposed head face to the knife cut-off slot is equal to the fresh web path from the holding spring, around the idler roll and through the guides to the nip. During manual threading toward the nip, a loose loop is formed in the web. When the leading edge of the fresh web approaches the driven nip roll, it is pulled thereonto by the vacuum and up to the said plane. Braking stop bars are replaced by the said spring on one side and the -0-A-adjacent idler roller on the other side. The idler roller has a high friction surface thereon and has a high inertia due to its mass. A high torque constant braking force is applied to the idler roller which causes the traveling expiring web to decelerate at a constant rate in a minimum controlled time interval. -0-B-</p> |
