Abstract: A sewing machine handle is provided with depending legs which terminate in eccentric pads that are insertable in holes in the casing of the machine at the top of the bracket arm and are caused to engage the inside of the casing and support the machine when the handle is lifted.

Abstract: A module including a frame which supports a motor, reduction gearing and a belt driving pulley is mounted in a sewing machine for position adjusting movements in one direction effective to set tension in a shaft timing belt, and position adjusting movements in another direction effective to set tension in a hook shaft timing belt.

Abstract: A picking arm for an underbed thread trimmer which engages the bobbin thread and one limb of the needle thread and holds them so that a thread catching arm may engage the bobbin and needle threads and draw them into severing relation with a cutting edge of a thread cutting blade. After the threads have been cut, the picking arm returns to a rest position with the end of the bobbin thread retained in a channel contained in its thread engaging extremity. The bobbin thread is held in a position where it will be available for concatenation with a needle thread for the production of lockstitches.

Abstract: A sewing machine work feed mechanism with guide means for tilt free motion of the feed dog in a linear path, the feed mechanism utilizing a fabricated sheet metal feed bar, centrally pivoted, and of a length from the pivot to one end of at least 10 times the maximum feed stroke.

Abstract: In a lockstitch sewing machine, a bobbin thread replenishing mechanism for selectively rotating the bobbin to wind replenishment thread thereon from a needle by means of a spindle selectively engaging the bobbin for rotating the bobbin with the machine looptaker wherein a slip clutch provided with an elongated slot is positioned around a flattened end portion of the spindle generally within a central aperture of a bobbin thread control cam. The slip clutch has an enlarged lower flange which rests on the looptaker base and rubs against the thread control cam so that by this arrangement the spindle will be driven with the looptaker by way of friction coupling of the slip clutch between the looptaker and the thread control cam. Should sufficient resistance of the turning of the spindle arise, the looptaker and thread control cam turn freely relative the slip clutch thereby preventing overwinding of the bobbin.

Abstract: A sewing machine is disclosed having means for automatically sewing a buttonhole. A Hall Effect sensor switch interacts with a lever, which engages adjustable spots on a buttonhole gaging presser foot, to provide signals for electronic circuit logic indicating the end of a buttonhole being sewn.

Abstract: A digital pressure sensor system is disclosed wherein a pressure differential causes the resistance of two equal, diffused piezoresistors to change by equal but opposite amounts. Temperature compensation is achieved by using the temperature dependency of the piezoresistors in combination with a temperature reference resistor to establish a plurality of time durations of a distinct voltage level. The ratio of these time durations forms a temperature compensation factor which may be used to compensate the pressure reading.

Abstract: A work feeding mechanism for sewing machines including a feed dog with two pair of mutually orthogonal serrated teeth to drive a fabric past a stitch forming area in directions defined by mutually orthogonal axes. The feed dog is slidably mounted to a bracket which in turn is pivotally fastened to one extremity of a feed bar whose opposite extremity is suspended by gimbals carried in the bed. Means are disclosed to selectively impart oscillations of a varying amplitude and direction to the slidable feed dog in timed synchronization to the work feeding mechanism to drive the feed dog in lateral and longitudinal directions of fabric feeding motion which extend along the length of the sewing machine bed and normal to the length of the bed. Fabric feeding information for the work feeding mechanism may be stored in an electronic memory to permit the production of ornamental stitch patterns.

Abstract: A hammer drill having a bypass switch which is activated by the selector ring to prevent the drill from operating in the hammer mode by shunting the reversing switch. This is a precaution to prevent damage to the clutch teeth which are designed for ratchet action when the tool is operated in the forward direction, but will lock down in reverse to stall tool or damage the mechanism. In the drill mode, the bypass switch connects the reversing switch in circuit with the on-off switch.

Abstract: The instant invention provides, in combination, a metal part having a cylindrical opening, a chamfer below the cylindrical opening, and an aperture below the chamfer, the diameter of the cylindrical opening being less than the diameter of the aperture at the juncture of the aperture and the chamfer, and glass fused only to the wall of the cylindrical opening.

Abstract: A slide projector located within a rear-screen projector has means therein for projecting images, contained on slides, onto a self-contained projection screen. Two lenses having different focal lengths are mounted within the projector housing and may alternatively be brought into the optical path for projecting slides, having different size formats, such that the projected image fills the projection screen.

Abstract: A portable, power operated circular saw having a housing or frame and a base plate pivotally connected at its forward end to the saw housing or frame for swinging movement about an axis parallel the axis of rotation of the blade mounting shaft is provided with new and improved base plate inclination adjustment means comprising an adjustment arm having an elongated arcuate portion provided with an elongated arcuate slot generally concentric the pivotal axis of the base plate and a clamping member extending through the arcuate slot for clamping the adjustment arm selectively at a fixed position relative the saw housing or frame, the clamping member being actuated by relative rotation between a pair of camming members having opposed cooperating interacting inclined ramps or cam surfaces, at least one of the cam members being adapted to be rotated by an operating lever.

Abstract: A modular upper thread tension device utilizing an end of a tension beam to press together at least a pair of opposed thread engaging discs, and a raised helix form track on an end cam to provide a variable pivot point for the beam, all the components of the tension device being arranged to provide a compact form of construction. The entire tension assembly is supported on a sheet metal bracket which is attachable to the sewing machine frame with the thread engaging discs thereof lying beneath a slot in a top cover. A bell crank is fulcrummed on a pin attached to the support bracket, and has one leg thereof pivotably attached to a first end of the tension beam, which is arranged to lie as an extension to that leg. A mandrel is supported, by lugs of the support bracket, parallel to the tension beam, and has one end thereof extending through the second leg of the bell crank.

Abstract: A throat plate for a sewing machine having an above the bed feeding system, which throat plate provides for minimum drag on the work material. The throat plate is fashioned with a relief in which is situated a feed plate supported upon ball bearings for minimum friction, which feed plate is resiliently loaded to a central position. The throat plate is designed so that a presser foot of the above the bed feeding system will not impinge upon the movable feed plate and the feeding foot will impinge only upon the movable feed plate. Thus, work material captured between the feeding foot and the movable feed plate is not subjected to the usual drag from a stationary throat plate and, upon being released by the feeding foot, the movable feed plate returns to a starting position.

Abstract: A housing for a power tool having an access aperture for mounting the brushes of a universal motor which is journaled in the housing. Tabs hold the brushes within a recess, and screws are threadedly connected to the housing to clamp the tabs. A cover is substantially "U" shaped and has posts extending inwardly in superposition to the screws to prevent the screws from backing out due to vibration or other loosening thereof.The cover fits between an upper and a lower housing extension and provides a smooth continuous outer configuration, through which vent slots permit the passage of cooling air.

Abstract: An annular disc is forced onto the central sleeve of the sewing machine bobbin case and held in place by the tight interference fit. A set screw within the limited area of the front wall, thick enough to hold the entire length of the screw, can be adjusted from outside the bobbin case to set the braking pressure of the disc against a bobbin flange to prevent excessive rotation of the bobbin and spillage of its thread.

Abstract: A system is disclosed for positioning an instrumentality over a predetermined range in response to a digitally coded position signal. To effect a controlled reduction in the instrumentality movement, an operational amplifier is provided having a feedback circuit including a fixed resistor and a controllable switch connected across the resistor. The switch is selectively controlled to short circuit the resistor at a controlled rate to effect a controlled gain reduction for the operational amplifier.

Abstract: A linear motor construction in which a plurality of parallelpiped shaped permanent magnets are retained within an easily molded spool having an axial bore formed through the axis thereof. A coil which may be electrically excited is wound about the spool and produces a magnetic field when excited, which reacts with the field produced by the permanent magnets to cause linear motion in a ferro-magnetic, cylindrical armature which is slidably contained within the axial bore.

Abstract: An automatic bobbin winding system for lockstitch sewing machine having the capability to wind needle thread around said bobbin while said bobbin is supported within the looptaker of the sewing machine wherein a depleted condition of the bobbin is sensed causing the work feed system to be disconnected, the bobbin winding system to be enabled and endwise reciprocation of the needle bar to be suspensed after needle thread is introduced into the bobbin winding system in order to fully wind the bobbin supported within the looptaker. When the bobbin is completely wound, a full bobbin sensing device is activated which terminates the bobbin winding, reinitiates the work feeding system and the endwise reciprocation of the sewing needle in order to continue stitching at that point where bobbin thread depletion was first sensed.

Abstract: An optical buttonhole switching arrangement in which the movement of reflective means carried on a moveable buttonhole foot are sensed as the foot is moved by the fabric feeding movement of a feed dog against the garment being sewn. The foot includes adjustable optical targets whose movement may be sensed by a photosensor carried on the sewing head. The spacing of the optical targets may be manually adjusted to accommodate buttons of different sizes. The photosensor is connected to an electronic circuit whose output may be used to control the retrieval of buttonhole stitching information from an electronic memory.