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AssigneeI.M.A. Industria Macchine Automatiche S.P.A.
InventorPaolo Marzocchi
Estimating the term…
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).
A machine for making filter bags containing a product for infusion, having a pick-up tag connected to the top of the filter bag by an intermediate thread, said machine comprising a wheel which rotates with a stepping motion about its own axis of rotation, being equipped with grippers, the wheel bringing the grippers into contact with a series of operating stations, comprising at least one station for folding a tubular semi-finished product containing the product for infusion, and at least one station for knotting the thread, the machine further comprising thread feed means which operate on the thread fed between pairs of the grippers positioned one after another along the edge of the wheel;
A machine for making filter bags containing a product for infusion, having a pick-up tag connected to the top of the filter bag by an intermediate thread, said machine comprising a wheel which rotates with a stepping motion about its own axis of rotation, being equipped with grippers, the wheel bringing the grippers into contact with a series of operating stations, comprising at least one station for folding a tubular semi-finished product containing the product for infusion, and at least one station for knotting the thread, the knotting station comprising a knotting device having needles for knotting the thread to the tag and the top of the filter bag, the needles being brought into contact with stop elements for the tag and the top of the bag and with respective interceptor elements which are mobile relative to the needles, at least one of the needles presenting a first and second eye, being located at different distances from the point, the needle or needles being moved in such a way as to pick up the thread with the second eye, forming a loop in which the thread is associated with the first eye, the interceptor element being moved in time with the needle so that it passes through the first eye, pushing a section of thread through the loop;
A method for making filter bags containing a product for infusion, having a pick-up tag connected to the top of the filter bag by knotting an intermediate thread, the method comprising stages for forming a loop in the thread using at least one needle, the latter having a first and second eye, being located at different distances from the point, and moved in such a way as to pick up the thread with the second eye, associating it with the first eye;
The method according to claim 45, wherein the gathering stage is effected by air jet means, being designed to act upon hanging sections of thread.
Dependencies are inferred from the claim text.