초록 ▼

A vacuum packaging apparatus is disclosed having a novel vacuum sensor system. The vacuum sensor system includes first and second sensors in communication with a control circuit, which sensors are provided to detect first and second preset vacuum levels as a container is being evacuated. The control

A vacuum packaging apparatus is disclosed having a novel vacuum sensor system. The vacuum sensor system includes first and second sensors in communication with a control circuit, which sensors are provided to detect first and second preset vacuum levels as a container is being evacuated. The control circuit further includes a timer for measuring the elapsed time between detection of the first and second preset vacuum levels. The control circuit computes an additional time period necessary to reach a target vacuum level after reaching the second preset vacuum level by multiplying the elapsed time between the first and second preset vacuum levels by an algorithmic factor stored in the control circuit. The algorithmic factor is a numerical constant that is derived for a particular pump type, and is based on the pump characteristics and selected values for the first and second preset vacuum levels and the target vacuum level. The control of the vacuum level is self regulating, and compensates for atmospheric conditions, altitudes or pumping capacities.

대표청구항 ▼

[ What is claimed is:] [1.]1. A control system in a vacuum packaging apparatus including a pump, the control system provided at least for controlling an evacuation of a container associated with the vacuum packaging apparatus to a target vacuum level, the control system comprising:means for measurin

[ What is claimed is:] [1.]1. A control system in a vacuum packaging apparatus including a pump, the control system provided at least for controlling an evacuation of a container associated with the vacuum packaging apparatus to a target vacuum level, the control system comprising:means for measuring a first time between a first vacuum level and a second vacuum level as the pump evacuates the container;an algorithmic factor, a value of said algorithmic factor being dependent at least on said first vacuum level, said second vacuum level and said target vacuum level; andmeans for computing a second time for which the pump must be run after the first vacuum level to reach the target vacuum level, said computing means using said first time and said stored algorithmic factor.