Abstract: A connecting link for setting stitch width or length is fashioned as a flat metal piece and is retained on the bearing side in a molded-on synthetic resin bearing head. The bearing head is suspended by means of two trunnions on a bearing bracket and on an index lever attached to the bearing bracket. The sliding block is constituted by a sliding sleeve made of a synthetic resin, encompassing the connecting link and articulated by way of two trunnions to the linkage leading to the needle bar frame.

Abstract: The lifting device (19) of the presser foot (21) of a sewing machine is operable through the use of an operating axle (18) and a toggle lever (20). The operating axle (18) is connected to a slide (15) capable of engaging and disengaging a coupling mechanism (10). The coupling mechanism (10) is arranged between the lifting device (6) of the feed dog (3) and the oscillating drive means (7) of the lifting device. During the lifting of the presser foot (21) by means of the toggle lever (20), the coupling pin (12) of the coupling mechanism (10) is simultaneously placed out of engagement with the driven oscillating lever (8) by means of the slide (15). Thus the drive of the lifting device (6) is interrupted, and a spring (13) pulls the feed dog (3) into its lowered position. Thus the manipulation of the sewing material is made possible without the feed dog presenting an obstacle.

Abstract: 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).

Abstract: A feeder device for a sewing machine containing a stitch plate and provided with a material feeder which reaches through the stitch plate from below, and which is driven by a lift- and thrust rocker along a path made up of four phases. The feeder device further includes a support member and an intermediate rocker. The support member of the material feeder is arranged on the intermediate rocker, which in turn is rotatingly attached to the thrust rocker whereby the horizontal rotational axis of the support member is arranged on the intermediate rocker at a distance from the rotational axis of the intermediate rocker and substantially parallel thereto.

Abstract: A winding device for a sewing machine including a sewing mechanism connected to a machine drive mechanism, by a coupling which comprises, a sewing machine housing, the winding device being movable to swing into the sewing machine housing and be covered by a lid when not being used. A two-armed hinge support is pivotally disposed on the housing and connected to the lid. One arm of the said two-armed hinge support is connected by a lever mechanism with a support, and the support is pivotally attached to the sewing machine housing for the winding device forming a toggle joint such that when the lid is opened the toggle joint is pushed through and the winding device is brought into its operating position and secured there while the other arm of the two-armed hinge support disengages said coupling between the machine drive mechanism and the sewing mechanism.

Abstract: A gap stitch mechanism for a sewing machine containing a needle shaft which is oscillatingly driven by a crank assembly, wherein the crank assembly is provided with means for reducing the crank radius at predetermined intervals during the sewing operation, thereby determining the stroke of the needle shaft and making it impossible for the loop catcher to catch the needle thread.

Abstract: The present invention is directed to a skipped-stitch mechanism on a sewing machine having a needle bar oscillating in a longitudinal direction, a control device for producing lateral swing-out motions of the needle bar in order to make different zigzag stitches, and a coupling device coacting with the needle bar and operated by a second control device so as to intermittently separate the needle bar from its driving member under the control of a program device in order to skip the stitching.

Abstract: A lifting device for the presser foot of a sewing machine comprising an operating lever provided on a front face of the sewing machine for synchronous knee or arm operation. The operating lever is connected via a linkage to one end of a double lever arranged in the proximity of the rear side of the machine. The other end of the double lever engages the presser bar. The double lever is supported to be pivotable in a vertical plane. An upwardly projecting guide arm is operatively connected to the lever arm and includes a detent member which is in engaging relationship in a groove which is disposed in a vertical plane. The groove extends approximately in the shape of a heart and closes on itself. The groove has, at the tip of the heart, a lower detent location and, in the central zone between the two upper arcs of the heart an upper detent location for receiving the detent member. Upper stop locations are positioned in the upper arcs of the heart.

Abstract: A hem forming means comprising a guide shoe suspended with limited movability on a spring clip directly in front of the needle hole of the machine. The spring clip, which is arranged at right angles to the conveying direction of the sewing material is attached to a ruler forming an edge abutment surface for the sewing material. In the zone of the edge abutment surface, the guide shoe is provided with a turndown nose which has, on the side facing away from the ruler, a lateral surface extending with broadening of the turndown nose at an acute angle with respect to the needle hole. This lateral surface extends at a spacing parallel to a beveled surface of the base plate, said beveled surface extending toward the needle center. The beveled surface constitutes one limitation of a wedge-shaped edge cutout of the base plate, into which the turndown nose of the guide shoe disposed thereabove can enter under spring pressure.

Abstract: The device is incorporated in a sewing machine having an arm enclosing and rotatably mounting an arm shaft connected to the sewing mechanism, a drive wheel rotatably mounted on the arm shaft and driven in any suitable manner, and a thread winder including a wheel selectively engageable with the drive wheel. A clutch ring surrounds the arm shaft and is pivotal on a pin extending diametrically of the arm shaft, the clutch ring having a trapezoidal engaging cam engageable in trapezoidal recesses in the drive wheel. A flat spring biases the clutch ring normally to couple the drive wheel to the arm shaft. When the thread winder is moved into a position adjacent a fixed stop, a release stirrup engages the clutch ring and pivots it to a position disconnecting the drive wheel from the arm shaft. Another spring biases the release stirrup away from the clutch ring.

Abstract: A switch construction, comprises a support base upon which is mounted a spring of hemispherical outline which includes an annular lower portion with a plurality of upstanding circumferentially spaced curved segment portions which are spaced apart at their tops to define a centering area for a top cover which is pivotal on the base. A contact member is in the form of a lever which is pivoted at one end on an upstanding portion of the base, and has an opposite engagement end which, for example, is movable along a rheostat control for the purpose of changing the setting thereof. The switch contact member is provided with a central substantially hemispherical cam portion which cooperates with a foot actuated cover and a similar cam portion defined on the cover which is located within the central part of the supporting spring.