| 摘要 |
Stitch 10 fixations (12, 14, 15, 16, 17, 18, 19, 20 and 21) are used in both ends of the filter cover 6 and in the drainage filter cover fastening zone. Stitches break in one or some first stitch rows (II) and in the end of fastening are switched in one or several stitch rows in the direction of the perimeter. In the other version of the invention, implementation stitch 10 fixation 22 is continuously allocated at the end of the fastening zone in the direction of the perimeter. A partial or complete stitch dropping is thus enabled in the fastening zone of filter cover 6 so the filter cover 6 can be widened in order to take up the stitches and avoid stitches from dropping outside the fastening zone. |
