Two-thread lock-stitch sewing machine with thread cutter

A two-thread lock-stitch sewing machine, comprising:

• a sewing needle (10), which carries a needle thread (13) and is movable to reciprocate up and down along a motion travel (11);
• a bearing plate (16;
• 16′) for a workpiece (17);
• a feeder (19;
• 19′);
• a stitch hole (20;
• 20′) formed in one of the bearing plate (16;
• 16′) and the feeder (19;
• 19′) for the sewing needle (10) to pass through;
• a shuttle (21),
• which is arranged underneath the bearing plate (16;
• 16′) and rotatably lodged in a bearing block (30), and
• which has a shuttle body (22), which is rotatable about a vertical axis (29) and which is provided with a rotatable bobbin case (24) and supplies (25) of a shuttle thread (27);
• two stationary cams (48, 49;
• 48′, 49′), which are disposed in proximity to the stitch hole (20;
• 20′);
• a holding finger (43), which is provided on the bobbin case (24) and has an end (44) located between the cams (48, 49;
• 48′, 49′);
• a thread cutter (42) with a thread pulling knife (38),
• which is movable to reciprocate between a swung-out position (A) and a swung-in position (E), performing a cutting motion in an x-y plane that extends at right angles to the vertical axis (29),
• which comprises a hook (39), which seizes the threads (13, 27), and a cutting edge (40), and
• which, in the swung-in position (E), is movable into a space (64) between the motion travel (11) and the cams (48, 49;
• 48′, 49′);
• wherein the thread pulling knife (38) is formed on the free end of a lever arm (36) which is connected to a shaft (33) that is parallel to the vertical axis (29), and which is movable above the bobbin case (24);
• wherein the cams (48, 49;
• 48′, 49′) are disposed on a rib (46;
• 46′), which has an upper surface (50;
• 50′) that is substantially parallel to the x-y plane;
• and
• wherein the bearing plate (16;
• 16′) is provided with a lower surface (62;
• 62′) that is substantially parallel to the x-y plane, with the lower surface (62;
• 62′) and the upper surface (50;
• 50′) being disposed at a distance (a) from each other that is measured at right angles to the x-y plane, forming an interspace (63) for the lever arm (36) to pass through unimpeded for the performance of the cutting motion.