Metering mechanism
US4793523A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 21, 1986 |
| Grant date | Dec 27, 1988 |
| Priority date | — |
| Expiry date | Apr 21, 2006 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA01C7/123
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A metering mechanism comprises a housing (7) with a material inlet (12) and a rotary metering member (27) that is rotatably mounted between side walls (8,9) of the housing with its periphery exposed to a chamber (48) within the housing so as to meter material from the chamber as it rotates, characterized in that a removable insert (74) is provided that is a close fit in said chamber and has a passage (75) through it that communicates at one end with said inlet (12) and at the other end with the periphery of the rotary metering member (27) so that the effective volume of said chamber (48) is reduced to the volume of said passage (75). Thus, if the metering mechanism incorporates the known shutter-type tramlining device in which a shutter (24) serves to close the inlet (12) to the housing, the quantity of speed retained in the chamber within the housing is reduced and therefore the length of a bout that will be sown after closing the shutter will be correspondingly reduced. The metering mechanism may also incorporate a tramlining device comprising an arcuate shutter member (84) that is mounted within the housing so as to be rotatable about the rotary metering member between the perip…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.