Process and device for automatically determining the...

B - Operations – Transporting – 29 – C

Patent

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Details

B29C 65/08 (2006.01) B29C 53/42 (2006.01) B65C 3/06 (2006.01)

Patent

CA 2592223

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.

L~invention a trait au domaine des appareils permettant de déterminer automatiquement le début d~une opération de soudage afin de réaliser des étiquettes tubulaires en film plastique. Le dispositif objet de l~invention comprend un élément de soudage tel qu~une sonotrode (2) pour soudage ultrasonique monté sur les tourelles d~une étiqueteuse. Il est formé de deux parties, l~une mobile et l~autre stationnaire fixée à la tourelle et comporte des éléments coulissants engagés dans des guides respectifs (4) qui permettent à la sonotrode (2) de glisser lorsqu~elle est stoppée par la résistance de l~objet à souder. Entre-temps, comme la distance entre les dites parties stationnaire et mobile diminue, un ressort (11) est comprimé et un capteur (8) déclenche la translation et le soudage. Le ressort (11) ramène la sonotrode (2) à sa position initiale lorsque le dispositif (1) est retiré de l~étiquette soudée. Le procédé permet de lancer l~étape de translation verticale du soudage lorsque la sonotrode entre en contact avec l~étiquette à souder.

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