| 摘要 |
<p>A thread gripper and cutting device for a sewing machine is inserted in a cover plate (1) forming the working surface (A) of the sewing machine. Thus the thread gripper and cutting device is inserted in one of the corner points of the diagonal of an imagining square (y), with the point of needle penetration (x) lying in the other corner point thereof. A first clamping disk (8) is integrally joined via a marginal web (4c) with the shank portion (4a) of a retaining bush (4). The clamping disk (8), which is rounded on all sides, projects only a little beyond the working surface (A) and is slightly inclined with respect to the latter. The corresponding end face (12) of a second clamping disk (11) is urged, by means of a spring (14), against the inner face (9) of the clamping disk (8). This second clamping disk is seated on a pin (13) guided in the shank portion (4a). The lead-in slot (15) for the threads (F) lies at the highest point of the clamping plane formed by the clamping surfaces (9, 12). The line of slope of this clamping plane is located approximately at a right angle to the aforementioned diagonal (x-b). The edge of the marginal web (4c) most removed from the penetration point (x) and lying on an outer surface line of the retaining bush (4) is formed directly below the first clamping disk (8) as a cutting blade (10). The marginal web (4c) is crescent-shaped in cross section.</p> |
