Adhesive bonding and miscellaneous chemical manufacture – Surface bonding means and/or assembly means therefor – Automatic and/or material-triggered control
Patent
1989-11-30
1991-06-18
Powell, William A.
Adhesive bonding and miscellaneous chemical manufacture
Surface bonding means and/or assembly means therefor
Automatic and/or material-triggered control
156521, 156DIG33, B26D 500, B32B 3100
Patent
active
050247174
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
The invention relates to a labelling apparatus for affixing labels to containers.
Labelling machines to which the label material is supplied in the form of a strip are of economical interest, because the cost of an individual label is conspicuously lower than in the case of pre-cut separate labels.
A labelling apparatus of the type defined above in known from DE-OS 22 36 835. In the labelling apparatus shown and described in this publication, the label strip is guided over guide pulleys towards a blade cylinder operable to cut individual labels therefrom. The thus separated individual label is subsequently guided over further guide pulleys towards an attaching cylinder operable to attach each label to the peripheral surface of a respective pallet of the pallet rotor. In the further course of operations a transfer cylinder takes the meanwhile adhesive-coated individual label off the pallet rotor and attaches it to a container. The blade cylinder is rotated at the same speed as the strip feeding mechanism, so that a given blade cylinder is only capable of cutting labels of uniform size. Another disadvantage of the known labelling apparatus resides in the fact that in the case of an interruption of the supply of bottles or containers to the labelling apparatus, individual labels continue to be attached to the pallet rotor, potentially resulting in fouling and malfunction of the apparatus.
Known from DE-PS 32 16 138 is a labelling apparatus using stacked labels. This labelling apparatus comprises a pallet rotor the adhesive pallets of which are guided in a groove so as to be pivotable about individual shafts mounted at excentric positions relative to the rotor shaft. The pallet rotor is provided with clutch means permitting the individual adhesive pallets to be released from their engagement with the groove, so that the adhesive pallets can be pivotally displaced away from the label magazine. In the case of a gap between the bottels or containers to be labelled, the associated adhesive pallet can thus be uncoupled and thereby prevented from picking up a label.
It is an object of the invention to provide a labelling apparatus of the type defined in the introduction, which permits the labelling operation to be readily interrupted and subsequently restarted, particularly in the case of gaps in the container supply or malfunction of the label strip feeding mechanism.
In the operative state of the apparatus according to the invention, the labels are removed from the circumferential surface of the vacuum cylinder by rolling contact with the previously adhesive-coated pallets of the pallet rotor, and subsequently peeled off the pallets by a transfer cylinder provided with mechanically controlled gripper fingers for transfer to containers advanced past the apparatus as by means of a rotary table. To shift the apparatus from its operative state to an inoperative state, in which no transfer of labels is to take place, the invention proposes the distance between the vacuum cylinder supplying the individual labels and the adhesive-coated pallets to be variable, so that in the inoperative state the pallets are prevented from contacting the vacuum cylinder, as a result of which the separated individual label is retained on the vacuum cylinder and cannot be removed therefrom by a pallet of the pallet rotor. The variation of the named distance is effective in a surprisingly simple manner to ensure that the separated individual label remains on the vacuum cylinder and is not removed therefrom in the described manner by a respective pallet of the pallet rotor. Another advantage resides in the fact that even in the case of extended gaps between containers the vacuum cylinder is not soiled by the adhesive supplied to the pallets of the pallet rotor, which might otherwise impair the proper function of the vacuum cylinder.
Due to the fact that the shift between the operative state and the inoperative state is brought about by varying the spacing between the circumferential surfaces of the vacuum cylinder and the pallet
REFERENCES:
patent: 3565724 (1971-02-01), Yamaguchi
patent: 3867233 (1978-02-01), Eder et al.
patent: 4108710 (1978-08-01), Hoffmann
patent: 4526654 (1985-07-01), Malthouse et al.
patent: 4629528 (1986-12-01), Tanaka et al.
patent: 4763823 (1988-08-01), Eder et al.
Krones AG Hermann Kronseder Maschinenfabrik
Powell William A.
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