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AssigneeSidel
InventorsVanni Zacche, Daniele Marastoni, Pringpuangkeo Phuchakr
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The invention pertains to the field of apparatuses for automatically determining the beginning of a welding process which makes tubular labels of plastic film. The device comprises a welding element, such as a sonotrode (2) for performing an ultrasonic welding, which is mounted to turrets of a labelling machine. The device is formed of two parts, one movable and one stationary fixed to the turret and comprises sliding elements engaged in a respective guide (4) which allow the sonotrode (2) to slide when it is stopped by the opposite resistance of the object to be welded. Meanwhile, since the distance between said stationary and movable elements diminishes, a spring (11) is compressed and a sensor (8) triggers the translation and welding step. The spring (11) move the sonotrode (2) back to the initial position when the device (1) is moved away from the welded label. The process provides that the welding vertical translating step starts when the sonotrode contacts the labels to be welded.
Method for automatically determining the beginning of a welding process for making tubular labels of plastic film of the type comprising a welding element, such a sonotrode for making an ultrasonic welding attached to a welding turret of a labelling machine which performs the process in three steps, a first step of approaching to a label to be welded, a second step of welding as a result of the vertical translation of the welding element and a third step of moving away from the welded label and returning to the initial position, characterized by the fact that the second step of vertical welding translation starts when the sonotrode contacts the label to be welded, first step of the process, in that the welding starting signal is generated by a sensor actuated by the reciprocal sliding of a movable structure carrying the sonotrode and a vertically translating support structure.
Device for automatically determining the beginning of a welding process which makes tubular labels of a plastic film, of the type comprising a welding element, such as a sonotrode (2) for carrying out an ultrasonic welding, mounted to one or more welding turrets of a labelling machine which performs the process in three steps:
Device according to claim 23, characterized by the fact that the sensor (8) can be part of the movable elements or stationary elements.
Dependencies are inferred from the claim text.