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1. 发明专利

JPH04158893A LOWER THREAD-DRAWING OUT METHOD FOR NEW SEWING MACHINE AND DEVICE THEREFOR 失效
公开(公告)号：JPH04158893A
公开(公告)日：1992-06-01
申请号：JP28670790
申请日：1990-10-23
申请人： KAMIYA KANJI
发明人： KAMIYA KANJI
IPC分类号： D05B57/00
摘要： PURPOSE:To reduce the times of work for replacing a lower thread bobbin, and to improve the efficiency of sewing-work by a sewing machine, by a method wherein while a lower thread bobbin case for holding a large-sized lower thread bobbin is being turned at the peripheral part of a needle location, a loop in the needle thread spread is drawn and the lower thread bobbin case is passed through the inside of the loop. CONSTITUTION:When a needle 5 is lowered downward, a small-sized loop formed of a needle thread 6 near the point of the needle is first hooked by a split end part between antlered members 2 for spreading the loot in the needle thread. After that, with the rotation of these antlered members 2, the loop is spread in a large-sized loop in the form hooked between the top end parts of these antlered members 2. For a lower thread bobbin case 1, its axial length is made long, and a large-sized lower thread bobbin 21 increasing the amount of a lower thread is held in the case 1. While the lower thread bobbin case 1 held is being turned with the rotation of a bobbin case-holding device 3, the top part thereof is rushed into the loop in the needle thread spread, following which while the loop in the needle thread is being properly drawn in the direction of the main body of the lower thread bobbin case 1, the whole of the lower thread bobbin case 1 is formed so as to be passed through the inside of the loop in the needle thread.

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