Device for applying transverse welded seams to a plastics film web moved in a step-by-step manner

摘要

Device for applying transverse weld seams to a single-layer or multi-layer plastics film web which is moved in a step-by-step manner and is printed periodically with a predetermined repeating pattern, having a conveying device for the plastics film web, which conveying device is moved intermittently and synchronously with a welding device, having a welding device with one fixed and one moved welding jaw and a control device for the transport movement and the welding jaw movement, the control device having a drive wheel with an eccentric pin, a toothed quadrant which is pivotable back and forth about a fulcrum, a coupling rod between the eccentric pin and toothed quadrant and a rocker arm to which the coupling rod is connected via a bearing pin which is adjustable in the longitudinal direction of the rocker arm by means of a setting spindle, the toothed quadrant operating, furthermore, on a gearing equipped, for example, with a toothed belt, which gearing drives the conveying device intermittently with the interposition of a clutch/brake combination. The rocker arm is connected to the back-and-forth pivoting toothed quadrant and has a setting spindle which is adjustable by means of a toothed belt. The toothed belt, on the other hand, is guided over the driving wheel of an adjusting motor which is controlled with fine correction (registration), governed by the repeating pattern, via a photoelectric cell connected upstream of the welding device and, in addition, for the coarse adjustment of the conveying device governed by the repeating pattern, the eccentric pin ... Original abstract incomplete.