초록 ▼

A vacuum-packaging machine is provided with a drive mechanism for each of the tools at the forming and sealing stations that not only vertically reciprocate the tools, but which also horizontally reciprocate the tools. Before the next section of the film being processed reaches the forming or sealin

A vacuum-packaging machine is provided with a drive mechanism for each of the tools at the forming and sealing stations that not only vertically reciprocate the tools, but which also horizontally reciprocate the tools. Before the next section of the film being processed reaches the forming or sealing station, the respective tool at each station is moved in the same direction as the film, while being simultaneously lifted up toward the film. As that section comes to a halt at the station, the tool is already raised into close juxtaposition to the film for performing its work. The tool is then raised the final quantum amount in order to start either the forming or the sealing process. As soon as the forming or sealing process has been completed, both the conveyer chain and the tools are actuated for forward, downstream movement. The tools, in addition to their forward, horizontal movement, also drop down, in order to clear the packages to allow unobstructed passage of the film.

대표청구항 ▼

A method of reducing the dwell time of a tool at a forming or sealing station of a packaging machine comprising: (a) conveying film from which the package is made to the station; (b) stopping the film at the station; (c) processing the film at the station by means of the tool thereat; (d) after said

A method of reducing the dwell time of a tool at a forming or sealing station of a packaging machine comprising: (a) conveying film from which the package is made to the station; (b) stopping the film at the station; (c) processing the film at the station by means of the tool thereat; (d) after said step (c) has been completed, conveying the film processed at the station in the downstream direction away from the station; (e) substantially at the same time that said step (d) is commenced, translating the tool at least partially in the same, downstream direction as the film is conveyed during said step (d); (f) at least during part of said step (e), moving the tool away from the film until at least the tool clears the film; (g) before said step (b), at least translating the tool in the upstream direction with the tool positioned near the conveyed film; and, thereafter, (h) moving the tool in the downstream direction along with and toward the conveyed film until said steps (b) and (c) and performed, whereby the tool may be activated before the conveyed film comes to a stop and brought into working contact with the film after the film has stopped at the station; and (h) after said step (h), stationarily positioning the tool at the station and in contact against the film for carrying out said step (c).