A vacuum packaging machine for performing a vacuum sealing operation on product packages, comprises a vertical stack of vacuum chambers 4 which each manage to receive at least one unsealed product package 2 and are operable to perform an independent vacuum sealing operation on the least one product package 2. A conveyor arrangement 8, 9 is operable to load and unload a selected vacuum chamber 4 with the at least one product package, and the machine is arranged to operate the respective vacuum ch...

Apparatus and method are disclosed for vacuum packaging of a product in a two element package consisting of a preformed rigid base element and a preformed rigid cover element. The apparatus preferably includes a plurality of platens carried on a conveyor through a number of operating stations where the package is assembled with the base element disposed downwardly. The loosely assembled package is moved into sealing station where a concave housing placed over the package elements forms a vacuum ...

A variable resistor utilized as a keyboard of an electronic musical instrument is comprised of an elongated rectangular base member, a plurality of strip-shaped resistor bodies formed on one surface of the base member, a resilient pressure contact member covering resistor bodies and a plurality of mutually spaced apart strips of metal mounted on the inner surface of the pressure contact member to confront the resistor bodies with a small gap therebetween. By continuously varying the point of con...

A machine and method for evacuating sealed packages formed from flexible sheet material which may be heat sealed, and for sealing the package. A heat-sealing device has two sections disposed opposite each other and movable toward each other to seal two sheets of the flexible material together to form a sealed package. One of the sections comprises a suction head for applying vacuum to one of the sheets of flexible material to cause the one sheet to move toward a knife member fixedly secured in t...

A gas exchange head for contacting and piercing a container to allow gas communication and exchange between the gas exchange head and the container. The gas exchange head comprises a flow probe for piercing the container, the probe being hollow so as to allow the gas communication and exchange therethrough. The gas exchange head further includes an intermediate sleeve and an outer cylinder coaxially received on the intermediate sleeve. The outer cylinder includes a lower cup portion at its dista...

An improved sealing gasket for a vacuum-sealing station of a vacuum packaging machine which is made such that the outer perimetric portion thereof is made of a greater hardness than the rest of the sealing gasket, whereby the sealing heat-elements of a reciprocal heating element only substantially contacts against the softer material of the sealing gasket, allowing this softer material to conform to the uneven or non-level condition of the heating element. In the preferred embodiment, the outer-...

A vacuum packaging machine includes a plurality of vacuum chambers (3a, 3b) each arranged to receive at least one unsealed product package and operable to perform an independent vacuum sealing operation, each vacuum chamber having a longitudinal direction defined by a direction of travel of the respective product package through the chamber (3a, 3b), each chamber having a heat seal assembly (15) therein which extends transversely to the longitudinal direction. An infeed conveyor (17) can be prov...

The invention concerns a vacuum packaging machine having a sub-structure (1) and a cover (2). The machine further comprises a vacuum chamber (3) which is disposed in the vicinity of the union between the cover (2) and the sub-structure (1) and which comprises an upper part (4) and a lower part (5). The machine cover (2) comprises a base member (10) and at least one arm (11, 12), the arm being connected to the base member at one end. The chamber upper part (4) is mounted on the cover member (10) ...

A packaging machine for sealing a packaging container having a lid and a tray comprising an upper part and a lower part arranged vertically moveable against each other, at least three vertical pins mounted on springs for opening a packaging container by lifting the lid off of the tray, evacuating mechanism for exchanging gas within the packaging container and sealing mechanism for sealing the lid to the tray.

A vacuum packaging machine for performing a vacuum sealing operation on product packages, comprises a vertical stack of vacuum chambers 4 which each manage to receive at least one unsealed product package 2 and are operable to perform an independent vacuum sealing operation on the least one product package 2. A conveyor arrangement 8, 9 is operable to load and unload a selected vacuum chamber 4 with the at least one product package, and the machine is arranged to operate the respective vacuum ch...