Knife growth detector
US4056022A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 13, 1977 |
| Grant date | Nov 1, 1977 |
| Priority date | — |
| Expiry date | Jan 13, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T83/9406
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
In a tobacco cutting machine where tobacco is cut by knives mounted on a rotating drum, the knives are advanced as they are worn away. In order to prevent the knives being advanced too far, and becoming damaged by contact with other machine parts, a safety device is provided. This includes a blade positioned near the path of the knife edges to be struck by a knife if the latter is advanced too far. The resultant movement of the blade is amplified by a lever system and is used to trigger a microswitch in the cutter drum drive circuit, whereby when a knife is advanced too far the cutter drum is stopped. The advancing mechanism for the knives includes a ratchet device driven by pulses of compressed air via a piston and cylinder device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.