Patent ID: 6474044
Filing Date: 2002-11-05
Classification: B65B

Abstract:
An assembly, comprising:a vertical packaging machine; and a device, handled by a programmable controller, for an application of a system of opening and closing the packaging or zip formed by two overlapping elements which can be removably engaged, the vertical packaging machine comprising a framework supporting, in succession, a feeder of notched wrapping for the packaging, a forming tube and a welding unit for welding transverse edges of formed wrapping, the device for applying the system of opening and closing comprising a first welding unit upstream o f the forming tube for a first phase of welding of a zip fed transversely to a direction of forward movement of the wrapping and a second welding unit downstream of the forming tube for a final phase of welding of the zip, upstream of the forming tube, a carriage slidingly supported by the framework of the machine in the direction of forward movement of the wrapping to be formed and in turn supporting said first welding unit, a detector attached to the carriage to read a notch on the notched wrapper, means for moving said carriage in relation to the wrapping starting from a selected reference position on the framework of the machine, until reaching a position of reading of the notch by the detector for a first welding of the zip, and means for positioning the zip on the wrapping in the position selected for the first welding of the zip supported by said carriage.