Bobbin thread tension device
US4235178A · kind A · utility
9Cited by
4References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 26, 1979 |
| Grant date | Nov 25, 1980 |
| Priority date | — |
| Expiry date | Mar 26, 1999 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD05B57/26
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A bobbin thread tension for a closed end cylindrical body bobbin thread case of a horizontal axis type rotary hook for a lockstitch sewing machine consisting of a diagonally slotted thread aperture in the wall of the bobbin case partially covered by a bobbin thread control that is adjustably mounted on the wall of the bobbin case by a pivot screw at one of its ends and inward a clamp screw passing through an enlarged hole in the bobbin thread control allowing the control to be pivoted to cover an effective amount of the thread aperture thereby increasing or decreasing the bobbin thread tension.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.