Method and apparatus for monitoring scanning conditions during control of a yarn feeding device
US6125663A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 8, 1999 |
| Grant date | Oct 3, 2000 |
| Priority date | — |
| Expiry date | Mar 8, 2019 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD03D47/367
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A method and apparatus for monitoring the scanning conditions when controlling a yarn feeding device including a storing surface for the yarn, a drive motor, a sensor device having at least one sensor oriented towards a scanning zone defined in the yarn feeding device, and a control circuit connected to the sensor device. The sensor generates an object-output signal for control purposes in response to the movement, absence or presence of an object in the scanning zone. A test signal is formed from and substantially synchronously with the object-output signal, and the signal level of the test signal is compared with an alarm threshold value representing a just barely acceptable deterioration level of the scanning conditions. An alarm signal is generated when the signal level of the test signal falls below a predetermined threshold value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.