Sewing machine with step motor operated oscillation drive
US4671197A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 8, 1986 |
| Grant date | Jun 9, 1987 |
| Priority date | — |
| Expiry date | May 8, 2006 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD05D2207/06
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A sewing machine with a needle bar mounted in a rocker, has a step motor drive for the oscillation of the rocker. A memory is used in which are contained selected digital data for influencing the step motor and a control unit is inserted between the memory and the step motor for selection and conversion of the digital data into stepping pulses for the step motor. A pulse generator operating synchronously with a main shaft of the sewing machine is used for triggering the transmission of stepping pulses to the step motor. To improve the drive transmission and to avoid reactions on the step motor, the step motor is connected to a lever arm of the rocker via an eccentric transmission.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.