When a power source switch of a sewing machine (1) is turned on, a CPU (41) of the sewing machine displays a home screen on a display (11). When the CPU receives an operation of a setting key (10A), the CPU shifts to an adjustment mode. The CPU saves a movement trajectory and a feed pitch set by a user in a temporary storage area of a RAM (43). The CPU sets the movement trajectory to a standard trajectory, and sets the feed pitch to a standard pitch. When the user manually rotates a pulley, a feed base (33) moves at the standard pitch along the standard trajectory. In the adjustment mode, the CPU disables an operation of a pedal (22) and does not drive a main motor. When the CPU receives an operation of a return key or a home key, the CPU shifts to a normal mode.

A sewing machine is provided, which has lower feed teeth which feed a sewing object by a lower feed drive mechanism having a lower drive shaft 92 as a drive source and upper feed teeth which are driven by an upper feed shaft that is coupled to and driven by the lower feed drive mechanism. The sewing machine is provided with an upper feed lower shaft 1 which is supported rotatably on a machine main body and is coupled to the lower feed drive mechanism, an upper feed coupling section which transmits movement of the upper feed lower shaft to the upper feed shaft, and a transmission control section which controls halting and restarting of transmission of movement of the upper feed lower shaft. The upper feed coupling section is held at a movement transmission halt position by operation of the transmission control section.

There is provided needle drop control means which, when a sewing machine stop signal is generated, sets a needle 9 stop position on the more right side than a cloth cutting knife 16 with respect to an operator. The needle drop control means, when the formation of buttonhole darning stitches is completed, sets the needle 9 stop position on the more right side than a cloth cutting knife 16 with respect to the operator. The needle drop control means includes electrical drive means for moving a needle 9 to a given position existing in the right and left direction, and a control circuit for giving a drive instruction to the electrical drive means to stop the needle 9 at the given position, that is, the given needle stop position.

There is provided needle drop control means which, when a sewing machine stop signal is generated, sets a needle 9 stop position on the more right side than a cloth cutting knife 16 with respect to an operator. The needle drop control means, when the formation of buttonhole darning stitches is completed, sets the needle 9 stop position on the more right side than a cloth cutting knife 16 with respect to the operator. The needle drop control means includes electrical drive means for moving a needle 9 to a given position existing in the right and left direction, and a control circuit for giving a drive instruction to the electrical drive means to stop the needle 9 at the given position, that is, the given needle stop position.

Bei einem Antrieb für eine Nähmaschine, wobei der Antrieb mit der Hauptwelle in direkter Antriebsverbindung steht und über eine Steuereinrichtung drehzahlveränder­bar ansteuerbar ist, ist zur Verbesserung des dynami­schen Verhaltens des Systems Antrieb-Nähmaschine vorgesehen, daß er wenigstens einen mit der Steuerein­richtung (7) elektrisch verbundenen Eingabeschalter (21, 22) zur Eingabe von Befehlsimpulsen zur schritt­weisen Betätigung des Antriebs in beiden Drehrichtungen (1) derart, daß mit jedem Befehlsimpuls eine bestimmte, definierte Schritt­weite des Antriebs (1) und damit der Hauptwelle (2) ausgelöst wird, umfaßt.

Acamming device to provide a cycle of axial and rotational movements between two arms (11,33) in which the forward and return axial movements occur at different relative angular positions of the arms comprises a member (22) mounted on one of the arms and extending generally axially and tangentially beside the other of the arms, one of said member and the other of said arms being formed with a cam (23) having two oppositely directed faces (24,25) for engaging the the other said member and said other of said arms to rotate it about an axis in either direction until stopped, said cam then slipping out of engagement so that relative rotation between the arms can occur. To cause relative axial movement in one direction, a second cam (15) is fomred on one arm for engagement with the other arm, causing said relative axial movement in one direction on relative rotation of the arms in one direction. Relative axial movement in the other direction is prevented until relative rotation of arms in the other direction has occurred a predetermined distance past the relative angular position at which said relative axial movement in said one direction.

This cycle of movements may be used in connection with a button transfer device in a sewing machine, by way of example only.

Um bei einer Nähmaschine mit automatischem Fadenabschneider, zwecks Verschieben von sperrigem Nähgut, den Durchgang zwischen Nähfuss (32) und Stichplatte (33) zu vergrössern, ist ein Zusatzgerät vorgesehen, welches ein Rückstellaggregat (7, 11, 12, 13, 17, 18) umfasst, das auf den Antrieb (3) wirkende, auf einem Mitnehmer (17) angeordnete Angreiforgane (23, 23') aufweist, wobei der Mitnehmer mit einem Betätigungsorgan (12,13) in Arbeitsverbindung steht, um bei Verschieben des Mitnehmers den Antrieb durch die Angreiforgane zu erfassen, zurückzubewegen und dabei die Nadelstange (30) in Hochstellung zu bringen, während der Fadengeber (29) in seiner Tiefstellung verbleibt.

Die Angreiforgane (23, 23') können Bremsbacken sein, die sich am Mitnehmer (17) befinden. Zweckmässig ist die eine Bremsbacke (23) fest, die andere (23') dagegen verschwenkbar am Mitnehmer angeordnet.