초록 ▼

The invention relates to a tubular bagging machine comprising at least two cross-welding jaws arranged on opposing sides of a foil tube to be welded and rotating along a self-contained cam track. In order to be able to precisely infuence the amount of air to be enclosed in a tubular bag the inventio

The invention relates to a tubular bagging machine comprising at least two cross-welding jaws arranged on opposing sides of a foil tube to be welded and rotating along a self-contained cam track. In order to be able to precisely infuence the amount of air to be enclosed in a tubular bag the invention provides squeezing members such that each one squeezing member is provided in direction of movement in front of the cross-welding jaws, which squeezing memer contacts the tubular bag only over a portion of its width in order to squeeze in this manner the air in the tubular bag out of said bag. The tubular bagging machine of the invention can particularly be used for large tubular bags, in which a defined air cushion must be constructed to protect sensitive goods.

대표청구항 ▼

In a tubular bagging machine having at least two cross-welding jaws arranged on opposed sides of an elongated foil tube to be welded to form tubular bags, closed cam track means arranged on both sides of the foil tube, said cam track means having a substantially circularly extending portion and a su

In a tubular bagging machine having at least two cross-welding jaws arranged on opposed sides of an elongated foil tube to be welded to form tubular bags, closed cam track means arranged on both sides of the foil tube, said cam track means having a substantially circularly extending portion and a substantially rectilinearly extending portion, said rectilinearly extending portions extending parallel to one another to define a predetermined spacing therebetween between which the foil tube is oriented and moved in a direction that is parallel to said rectilinearly extending portions, said cross-welding jaws having guide roller means thereon received in said am track means so that, in response to a circuitous movement of said guide roller means in said cam track means, said cross-welding jaws are moved toward and into pinching engagement with said foil tube to form a welded seam as well as together parallel to said rectilinearly extending portions and while pinching said foil tube therebetween as well as away from each other, said tubular bagging machine further having a squeezing member arranged ahead in the direction of movement of each said cross-welding jaw, which squeezing member is movable together with said cross-welding jaw and having means thereon being pressed against the sidewalls of the foil tube, the improvement wherein said means on each squeezing member includes plural initially tensioned springs arranged parallel to one another and transversely with respect to a longitudinal axis of the foil tube and function, when pressed against the foil tube, to squeeze gases out of a still open end of a portion of the foil tube forming a tubular bag cross-welded at an end thereof remote from the still open end, wherein each said squeezing member includes a carrier for supporting said plural springs, the one end of each of which is hingedly supported on a respective one of said cross-welding jaws and the other end of each having a cam roller guided in said cam track means and maintaining said carrier and said springs carried thereby a predetermined spaced apart distance from one another which is less than the diameter of the foil tube to squeeze the foil tube to a partially closed condition, wherein said squeezing member has a finite length which corresponds substantially with the length of said rectilinearly extending portion of said cam track means so that air present inside the foil tube will be squeezed out of the foil tube over a length thereof equalling said finite length and ahead of the location whereat said cross-welding jaws come together to form a welded seam.