Package sensing/film control system for film wrapping machine
US4505092A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 26, 1982 |
| Grant date | Mar 19, 1985 |
| Priority date | — |
| Expiry date | Apr 26, 2002 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65B2210/12
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A package sensing system provides length, width and height signals to a film control system which selects the width and length of stretch film to be used by a film wrapping machine to wrap the sensed package. Package width is sensed by spring biased swing arms which active electrical switches upon deflection by an entering package. A wide package is indicated if both swing arms are deflected. The length and height of a package are sensed by a generally vertical downwardly extending lever arm which is pivotally mounted above the package entryway into the machine. A first electrical switch coupled to the lever arm generates a length signal upon initial contact by an entering package and a second electrical switch coupled to the lever arm generates a height signal depending upon the ultimate deflection of the lever arm by the package. Two film widths are provided with the narrower of the two being selected for packages which activate neither the width sensing system or the height sensing system and the wider of the two films being selected upon activation of either of those sensing systems. The length of the film drawn is determined by the length of a measured package with that length…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.