| 摘要 |
90-188 MACHINE FOR MANUFACTURING HELICALLY-SEAMING TUBING The invention relates to a machine for manufacturing helically-seamed tubing from a strip-like profiled blank (11a), in which machine the strip-like profiled blank is guided to travel under positive guidance into a tubular shape (11) over a distance corresponding to the pitch of a helical seam, whereupon the edges of the profiled blank brought into jointing contact are seamed together by using at least two seaming rolls (15, 16) one of which (15) is inside the tube (11) being formed and the other (16) outside it. In the machine the positive guidance of the profiled blank (11a) is accomplished by a loop, adjustable in size and formed of a chain-type traction member (14), inside which loop the strip-like profiled blank (11a) is adapted to be positively fed. One of the traction members (14) constituting the loop is attached to a rocker (22), which rocker (22) is provided with an adjusting member or adjusting members (29) for guiding the profiled blank (11a) to the point of seaming. The traction member (14) is attached at the other end thereof to a gearbox (23), by means of which gearbox (23) and a gear member (24) connected thereto the traction member (14) can be tightened, whereby a narrowing portion, which is preferably conical, can be produced in the tube on the basis of the control of the machine. The tube (11) can be positioned in the centre of seaming by means of the gearbox (23) and a support (25) thereof.
|
