Weft yarn feeding device for a loom
US4746848A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 14, 1986 |
| Grant date | May 24, 1988 |
| Priority date | — |
| Expiry date | Nov 14, 2006 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD03D47/362
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A weft yarn feed device (1) comprises a measuring and storing drum (7) for storing a predetermined length of a weft yarn (4) thereon for picking operation, a rotary yarn guide (6) for winding the weft yarn (4) on the measuring and storing drum (7), a feed motor (8) for rotating the rotary yarn guide (6), a drive control unit (3) for controlling the operation of the feed motor (8), and a command control unit (2) which gives commands to the drive control unit (3). The length of the weft yarn (4) wound on the measuring and storing drum (7) is detected accurately on the basis of the relation between the number of rotation of the rotary yarn guide (6) and that of the crankshaft of the loom, and a detection signal indicating the length of the weft yarn (4) wound on the measuring and storing drum (7) is fed back to the command control unit (2) to control the feed motor ( 8) properly for winding a predetermined length of the weft yarn (4) on the measuring and storing drum. The drive control unit (3) comprises a reference setting device (23) which provides a voltage corresponding to a reference rotating speed of the feed motor (8) so that the feed motor (8) is driven continuously for rotati…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.