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| Issue 1297-1 |
| US 6,923,130 B2 |
| Sewing machine |
| Christoph Heckner, Bielefeld (Germany); and Markus Richter, Detmold (Germany) |
| Assigned to Dürkopp Adler Aktiengesellschaft, Bielefeld (Germany) |
| Appl. No. 10/501,572 PCT Filed Dec. 19, 2003, PCT No. PCT/EP03/14626 § 371(c)(1), (2), (4) Date Jul. 13, 2004, PCT Pub. No. WO2004/059064, PCT Pub. Date Jul. 15, 2004. |
| Claims priority of application No. 102 61 339 (DE), filed on Dec. 28, 2002. |
| Prior Publication US 2005/0039657 A1, Feb. 24, 2005 |
| Int. Cl.7D05B 57/14 |
| U.S. Cl. 112—184 [112/231] | 7 Claims |
| 1. A sewing machine, comprising
an arm (1);
a base plate (3);
a needle (6), which is mounted in the arm (1) drivably in up and down reciprocation, for guidance of a needle thread (20);
a hook (8), which is mounted in a hook-bearing case (11) in the base plate (3), rotatable by a vertical hook-driving shaft (10) in a direction of rotation (48);
a transmission shaft (12), which is drivably lodged in the base plate (3);
a step-up gear (13), which is disposed between the transmission shaft (12) and the hook-driving shaft (10), for actuation of the hook-driving shaft (10) at twice the speed of the transmission shaft (12);
a bobbin case (21) housed in the hook (8) freely rotatably in relation thereto, wherein the bobbin case (21)
houses a bobbin (29),
is provided with a lifter cam (31),
has a stopping rib (22) which cooperates with a stopping cam (23) that is stationary relative to the base plate (3), preventing the bobbin case (21) from rotating in the direction of rotation (48);
a case lifter (33),
which comprises a lifter lever (32) that is applicable to the lifter cam (31),
a sensing lever (40) loaded by a spring (43), and
a lifter shaft (34), which is pivotably mounted in the hook-bearing case (11), non-rotatably joining to each other the lifter lever (31) and the sensing lever (40); and
a case-lifter drive mechanism (38),
which comprises an axial cam disk (39),
which is non-rotatably connected to the transmission shaft (12) and directly drivable thereby for rotation at a speed that is only half the speed of the hook (8), and
which comprises a frontal cam face 42, against which is pressed the sensing lever (40).
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