| 摘要 |
A method for moving a welding jaw (1, 6), especially on the transverse sealing station of a vertical bag-making machine, involves using two drives at right angles, which may be operated simultaneously or singly to provide a given speed and acceleration in any direction at any point on the closed track along which the jaw moves. A method for moving a welding jaw (1, 6), especially on the transverse sealing station (2) of a vertical bag-forming, -filling and -sealing machine (3), in which the jaw (1,6) is moved along a closed track (4) with a straight section (5) which fits an object to be welded (especially tubular film compressed between opposite jaws (1, 6)), the object and the jaws are moved at the same speed along the straight section (5) in order to weld the object within a sealing time (ts) by the heat from the jaws, and two drives (8, 9) acting in different directions (preferably at right angles to one another) move the jaws around one circuit of the track within the cycle time (tz). In this system, both drives (8, 9) may be operated simultaneously, or only one may be used, so that a given speed (V) and a given acceleration (a) in any selected direction of movement of a point (A) in the movement of the jaw (1, 6) is assigned to that point (A) at any point describing the track (4). An independent claim is also included for a vertical bag-forming, -filling and -sealing machine (3) with two linear electromagnetic drives (8, 9) at right angles to one another as suspension railways for moving the welding jaw (1), and actuated by a control unit (20), so as to give a point of motion (A) a coordinate-dependent speed (V) and acceleration (a) (referring to the coordinates of A on the track). |
