Patent ID: 6589347
Filing Date: 2003-07-08
Classification: B31B

Abstract:
An apparatus for applying spots of adhesive to intermittently advanced, successive objects of a series of objects, comprising:means for advancing the objects of the series in a stepwise fashion in accordance with a predetermined pattern wherein a phase of zero speed is followed by a phase of acceleration, by a phase of advancement at an at least substantially constant speed and a phase of deceleration back to zero speed; means for monitoring rates of speed of the objects during at least the acceleration and deceleration phases and for calculating a correction interval as a function of the direction and extent of variation of speed during the acceleration and deceleration phases, respectively; at least one paster including an adjustable valve and a nozzle arranged to discharge spots of adhesive onto intermittently advanced, successive objects on said advancing means, said valve including constituents having electrical and mechanical inertia; and control means for causing said nozzle to discharge adhesive onto intermittently advanced, successive objects of the series of objects for periods of time ascertained as a function of a plurality of parameters including a compensation interval t1 for said inertia and a correction interval tg reflecting said pattern of advancement of the objects where the compensation interval t1 is adjusted by the correction interval tg so as to compensate for the inertia of the constituents in the valve during the phases of acceleration and deceleration.