Device for measuring movement of material using a wheel rolling on the material
US4398348A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 5, 1981 |
| Grant date | Aug 16, 1983 |
| Priority date | — |
| Expiry date | Jun 5, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/363
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A measuring device for measuring the distance of feed of cloth in a sewing machine, comprising a wheel driven by the cloth without slippage and located at the presser foot. A plurality of slits on the wheel are arranged to cooperate with two slits in the bracket of the wheel, and thereby form two light gates producing two output signals in the form of a two bit binary code. This light is detected by photo transistors or photo diodes positioned to receive light through the slits from light emitting diodes or lamps. The output signals from the unit are applied to a data unit connected to compute a positive or negative feed of the cloth. The invention is especially useful when a buttonhole is to be sewn totally automatically.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.