Bight mechanism for a buttonhole sewing machine

US5819674A · kind A · utility

Assignee

• AMF Reece, Inc. · US

Inventors

• Rudy Papajewski, deceased · Blankenloch, DE
• Gerd Papajewski · Blankenloch, DE

Key dates

• Filing date: Sep 19, 1996
• Grant date: Oct 13, 1998
• Expiry date: Sep 19, 2016

Classification

• Technology area (CPC D): Textiles; Paper
• CPC primary: D05B3/06
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

Bight stitches at sides and bar tack stitches at ends of a buttonhole site are formed by periodically oscillating a needle bar holder over lesser and greater angles while a needle is in an up position. The needle bar holder is fixed to a horizontal transverse shaft. One end of a long, generally vertical arm is clamped to the shaft, and a generally horizontal link is pivoted to a lower end of the arm and to an adjustment slide in an upper arm of the inverted Y-shaped follower plate. The Y-shaped follower plate is pivoted on a central horizontal pivot. A double cam engages cam follower rollers oppositely extending from lower ends of the Y-shaped follower plate. Periodically, while the needle is up, the cams move the follower plate back and forth.