Abstract: Apparatus for guiding and braking elastic or nonelastic bands during sewing to pieces of fabric has an elongated flat housing of rectangular cross-sectional outline with a transversely extending channel for a band. The housing is separably affixed to the table of a household sewing machine and contains a reciprocable slide which can alter the effective width of the channel. The slide is installed at one side of the channel, and the housing supports an adjustable fabric guide at the other side of the channel. A plate-like biasing member is installed in the channel at a level above the band, and the biasing member can be moved up or down by a screw having a knurled head so as to select the force with which the underside of the biasing member bears against the upper side of the band.

Abstract: The upper side of the sole plate in a sewing machine presser foot is formed with a transversely extending channel for the median portion of a guide which steers the needle during making of a row of stitches adjacent the edge of a marginal portion of a piece of fabric. To this end, the guide has two end portions which extend laterally beyond the respective sides of the sole plate and have downwardly bent tips one of which slides along the edge of a piece of fabric when the sewing machine is in use. The guide can be moved longitudinally to place its end portions at selected distances from the respective sides of the sole plate. A male detent member on the sole plate normally engages a selected graduation of a notched scale on the central portion of the guide to maintain the guide in a selected position. The tips of end portions of the guide are located at a level slightly above that of the underside of the sole plate.

Abstract: A bobbin case wherein a cylindrical wall which surrounds the thread bobbin supports an externally mounted spring having a pan-shaped portion for a disc-shaped thread tensioning member provided with a flat thread-contacting surface which confronts a complementary portion of the external surface of the cylindrical wall. The bias of the spring upon the tensioning member, and hence the force with which the surface of the tensioning member urges the thread against the adjacent portion of the external surface of the cylindrical wall, is adjustable by a screw. The tensioning member is tiltably installed in the pan-shaped portion of the spring so as to adjust its inclination relative to the adjacent portion of the external surface of the cylindrical wall in dependency on the position of the thread.

Abstract: Reception or non-reception of a signal is detected on the basis of whether or not a certain noise level is reached at the receiver output. Measuring periods are formed, during each of which the charge of a capacitor changes from a fixed value to a value dependent upon the momentary noise. The time from the beginning of the measuring period until a certain state of charge is reached is compared with a reference time, and a receive criterion is produced when the time dependent upon the noise is shorter than the reference time. The reference time may be obtained in a manner similar to the way in which the first-mentioned time is produced. When both times are thus obtained in an analogous manner, not only the presence but also the absence of a signal can be detected much more rapidly than heretofore.

Abstract: The instrument has projections with locking teeth for locking the instrument in its closed clamping position, said projections being located near the connecting zone between the levers of the instrument and their ring grips. Near one projection a slide having a wedge surface is provided, which may be shifted between the projections against spring force by pressure onto a key of the slide, for spreading appart the projections and for disengaging their locking teeth. Disengagement of the locking teeth and opening of the closed instrument are substantially facilitated by simple and inexpensive means which do not hinder operation of the instrument.

Abstract: The hysterectomium comprises beside of clamping jaws on one side of the clamping jaws a cutting blade for cutting of tissue and on the other side of the clamping jaws a stitching device. The instrument permits a particularly rational working during which sections of tissue are clamped, sutured on one side and separated at the side.

Abstract: The forceps comprises clamping jaws which may be actuated clampwise by means of grips. One side edge of a first clamping jaw is in form of a cutting edge. On the side of the other clamping jaw lies a cutting blade which may cooperate with the cutting edge of the first clamping jaw for cutting the tissue clamped between the clamping jaws. The rest position of the cutting blade is determined by a catching device. The cutting blade engages below a protecting ramp in this catching device when the forceps is open. The forceps permits an easy, rational and proper working whereby injuries by uncontrollable and inadvertent motion of the cutting blade are excluded.

Abstract: An alternating presser foot with a vertically movable sole portion, fixed in the feeding direction of a feed dog, and a clamping pressure foot adapted to be placed on sewing material relative to the movable sole portion by means of a drive lever which cooperates with a needle bar for movement along with the sewing material in the feeding direction of the feed dog. For transmission of motion from the drive lever to said clamping pressure foot, an angle lever is provided, one arm of which, extends approximately vertically, defining a guide cam cooperating with a follower of the drive lever, while the other arm thereof extends approximately horizontally defining a pressure element for stressing said clamping pressure foot in order to place it in engagement with the sewing material.

Abstract: A double lever is provided having a forward arm which is operatively connected to a collar of a presser bar and a rearward arm which is connected via a linkage to an operating lever. A guide arm is articulated to the rearward arm and carries an index pin guided within a parallelogram-shaped inherently closed cam route. A spring-loaded swivel arm including a detent catch is associated with the lower cam section of the closed cam route. Upon light pressure being exerted on the operating lever, the detent catch locks the index pin in a position wherein the presser mechanism lies in close proximity to an uppermost lifted position. By additional pressure being exerted on the operating lever, the index pin moves passed the locking position. With the subsequent release of the operating lever, the presser mechanism returns to the lowered position.

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: An attachment for cutting the edge of a length of material travelling towards a sewing location is mounted on the working or operating surface of a sewing machine. A drive fork is acted upon by a needle bar and drives a movable cutter blade via a drive or control cam carrier. The movable cutter blade is arranged at a blade holder which is pivotable about a pivot axis which is laterally spaced from a cutting plane defined by the movable cutter blade and a fixed cutter blade. A large throughpassage or space for strips separated from the length of material by the cutter blades is formed between the cutting plane and the blade holder.

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 needle thread guide device containing an articulated thread feeder oscillating in a vertical plane on a sewing machine provided with a skip stitch mechanism working at intervals to form stitches of varying lengths, wherein a thread catcher is combined with a thread lever which can be engaged and disengaged synchronously with the skip stitch mechanism and which aligns in its operating position with a hook eye open to the top at a position of the upper area of the ascending movement part of the thread lever eye with the latter, thereby catching the thread loop which is carried along by the thread lever.

Abstract: A holder (3) for replacing the presser foot of a sewing machine comprising a foot plate (3a) attached to a presser bar (1) of the sewing machine (2), and a presser foot sole (8) operatively associated with the holder and being supported in a pendulating and vertically resilient fashion. A fixed blade (5) is adjustably mounted to the foot plate (3a) of the holder (3). A movable blade (9) is fashioned as a two-armed lever and is pivotably supported in a vertical plane. The movable blade (9) operatively engages the lower arm (13a) of a two-armed intermediate toggle joint with a carrier bolt (13). The other arm (13b) of the toggle joint has a curved cam contour (14). A control pin (15) is guided in the curved path of the cam contour (14), said pin being disposed on a control lever (16) supported (16a) at one end by the holder (3). The other end of the control lever is provided with a fork (6a) at the needle bar (6).

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: The thread take-off device of the sewing machine is arranged between the needle thread reservoir and the thread tightener. This device is provided to prevent the direct take-off of the thread by the take-up lever from the storage spool by providing, in front of the tightener, an appropriate thread reserve without requiring any change in the path along which the thread is traveling. The take-off device comprises a lever oscillating synchronously with the take-up lever at right angles to the thread path. A lever portion, located in the rest position of the take-off lever, approximately at right angles to the thread and directly beside the latter, intersects with each downward movement of the take-up lever control arm, the travel path of the thread, whereby a thread reserve is pulled off from the spool. The return of the take-off lever is effected by a spring.