DYNAMIC BUFFER FOR A CONTINUOUS ENVELOPE STUFFING SYSTEM

摘要

A dynamic buffer suitable for supplying piles from a cutting station to a continuous stuffing system has two storage levels, upper and lower, each having parking cells arranged in series for receiving, retaining and dispensing the piles. Each cell comprises two consecutive roller-counter-roller pairs, spaced by a distance smaller than a longitudinal extension of the piles, motorized in synchrony, suitable for adheringly gripping and drawing a pile; sensor means designed to detect whether each parking cell is free or occupied by a pile. Electronic managing and command means receives signals provided by the sensor means and pilots the flow of piles in inlet to the storage levels, transfers the piles to successive cells and enables outlet of the piles from the storage level, the electronic means acting in phase relation with the cutting station and the stuffing system, such that the supply of the piles thereto has a cadence proportional to the operating velocity thereof.

主权项

1. A dynamic buffer for a continuous envelope stuffing system, of a type for supplying piles formed by one of more sheets to the stuffing system, the sheets coming from a cutting station provided in a supply line arranged upstream, the continuous stuffing system being of a type in which a film of flexible material is unwound from a reel, supplied stretched on a horizontal plane such as to receive thereon a sequence of the piles, and then progressively wound in a tube fashion in order to wrap the piles and subsequently cut in spaces separating each of the piles from a next pile, the buffer being comprising: at least a storage level, comprising a plurality of parking cells, arranged in series, suitable for receiving, retaining and dispensing the piles, within each cell being provided: at least two lower rollers having horizontal axes that are parallel and distanced by an amount which is less than a dimension of the piles and parallel to the advancement direction, the lower rollers being synchronously motorized, independently of the lower rollers of remaining parking cells; at least two upper rollers, idle on axes thereof, each of which is suitable for forming, with the corresponding lower rollers, a roller-counter-roller pair able to adheringly grip and draw one of the piles; sensor means suitable for detecting whether each parking cell is free or occupied by one of the piles; electronic managing and command means, suitable to receive the signals supplied by the sensor means of each parking cell and to pilot a flow of the piles in inlet to the storage level up to bringing each of the piles to a most downstream parking cell, transferring the piles to the successive cells and finally allowing exit of the piles from the storage level, the electronic managing and commanding means acting in phase relation with the cutting station and the stuffing system, such that the supplying of the piles thereto is done with a cadence that is proportional to an operating velocity thereof.