Arrangement for the reading of photocell markings on a material web provided with decoration

Claim 1

In an apparatus for forming a tube-like member from a longitudinal web of packaging material provided with longitudinally spaced transverse creases and spaced transverse decorations thereon between the transverse creases and providedwith photocell markings between the transverse decorations, in which the tube-like member is filled with a contents and then transversely sealed, shaped and severed into packages in register with the crease lines, the web and filled tube-like member being subject to elongation prior to the sealing, shaping and severing of the filled tube-like member, the improvement of means for controlling the register of the creases of the tube-like member, after filling with contents, with means for sealing, shaping and severing, said controlling means comprising means engagable with the spaced transverse creases on the web prior to formation of the web into the tube-like member and rotatable thereby, switch means responsive to said crease engaging means and operable intermittently thereby, a photocell disposed adjacent the filled tube-like member immediately preceeding the means for sealing, shaping and severing the filled tube-like member and intermittently activated by said switch means when a photocell marking is about to pass said photocell means thereby preventing activation of said photocell means while the spaced transverse decorations are passing said photocell means, said means for sealing, shaping and severing said filled tube-like member being activated when said photocell means reads a photocell marking on said tube-like member whereby elongation of the web and the tube-like member is compensated for.