该装置是在缝纫机盖板形成（1）被使用，即在对角的假想正方形（Y）中的一个角点，在缝针落点的另一角点（x）位于的工作表面（A）。 第一夹持盘（8）是一个多边缘腹板（4C）到支撑套筒（4）一体地连接的柄部（4A）。 侧面磨圆夹持盘（8）仅突出上方的工作表面（A）略微; 它是稍微倾斜于后者。 靠在内表面（9）的夹持盘（8）的第二夹持盘的相应的端面（12）（11）通过弹簧（14），它位于一个所述轴部（4A）引导销（13）上施力。 插入间隙（15），用于螺纹（F）位于由形成夹持面的夹持表面（9，12）所限定的最高点。 夹持平面的下降线是大致垂直于所述对角（X-B）。 注射部位（x）的更远离所述固定套筒躺在（4）的横截面为月牙状边缘腹板的边缘的表面线的（图4c）被设计为一个切削刃紧接在第一夹持盘下（8）（10）。 整个设备可以抵抗弹簧作用（7）可以完全沉入该工作表面（A）; 不过它也只是略微并不会干扰Nähgutfluß。

The device is in the working area (A) of the sewing machine used cover plate forming (1), namely in a corner of the diagonal of a imaginary square (y), in the other corner, the needle puncture site (x) lies. A first clamping disk (8) is over an edge web (4c) to the shank part (4a) a holding sleeve (4) integrally connected. The sides rounded clamping plate (8) protrudes only slightly above the work surface (A); it is slightly inclined to the latter. Against the inner surface (9) of the clamping disc (8), the corresponding end face (12) of a second clamping disk (11) is pressed by a spring (14) which sits on a the shaft part (4a) guided bolt (13). The insertion gap (15) for the threads (F) is located at the highest point of the clamping surfaces (9, 12) formed by the clamping level, the fall line of the clamping plane is - substantially perpendicular to said diagonal (xb). Of the injection site (x) further away, to a generatrix of the holding sleeve (4) lying edge of the cross-sectionally crescent-shaped edge web (4c) immediately under the first clamping disk (8) formed as a cutting edge (10). The entire device can be lowered against spring action (7) fully to the work area (A); but it is otherwise very little before and does not disturb the Nähgutfluß.