MACHINE FOR ATTACHING A TAG TO AN INFUSION BAG USING AN INTERMEDIATE KNOTTED THREAD

WIPO Patent Application WO2000017055

A3

An improved machine (1) for making filter bags (2) containing a product for infusion, with a pick-up tag (3) connected to the top (12) of the filter bag (2) by an intermediate thread (5), comprises a wheel (6) which rotates with a stepping motion about its own axis of rotation (16) and is equipped with grippers (7) which are brought into contact with a series of operating stations, comprising at least one station (9) for folding a tubular semi-finished product (20) containing the product for infusion, and at least one station (15) for knotting the thread (5). The machine (1) has thread (5) feed means (33, 34, 35) which operate on the thread (5) fed between consecutive pairs of the grippers (7) along the edge of the wheel (6) so as to prevent it from sliding backwards. The thread (5) knotting station (15) is equipped with needles (45) which have a first and second eye (51, 52) positioned at different distances from the point. The needles (45) are moved in such a way as to pick up the thread (5) with the second eye (52), forming a loop (62) in which the thread (5) is associated with the first eye (51), interceptor elements (54) being moved in time with the needles (45) so that they passe through the first eye (51), pushing a section of thread (5) through the loop (62). The invention also relates to a method for knotting the thread (5).

MARZOCCHI PAOLO (IT)

PCT/IB1999/001550

August 31, 2000

September 16, 1999

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IMA SPA (IT)
MARZOCCHI PAOLO (IT)

B65B29/04; (IPC1-7): B65B29/04

WO1996031395A1

1996-10-10

EP0489554A1	1992-06-10
US4977728A	1990-12-18
EP0691268A1	1996-01-10
US4790254A	1988-12-13
DE2623796A1	1977-06-02

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