Bulk material handler and feeder
US4387842A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 31, 1980 |
| Grant date | Jun 14, 1983 |
| Priority date | — |
| Expiry date | Mar 31, 2000 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65H2408/212
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A bulk material feeder (10) has two rollers (12,14), at least the lower (14) of which is driven (24,26). Strip material (34) is threaded around the side of the upper roller (12) toward the direction of feed, between the rollers (12,14), around the side of the lower roller (14) opposite the direction of feed and to downstream machinery (38) spaced from the feeder (10). Roller (12,14) spacing is greater than material (34) thickness precluding compression of the material (34). Feed is produced by friction between the roller (14) and material (34) only. Feed rate is greater than usage thereby producing a depending loop (40) between the feeder (10) and the downstream machinery (38). In one embodiment, increasing loop (40) size decreases material (34) and roller (14) contact, causing relative slippage and a discontinuance of feed. In another embodiment, both rollers (12,14) are driven and loop (40) size is limited by a photoelectric device (42) and associated control circuitry.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.