Abstract: A circuit for duplicating the function of an incremental shaft encoder comprises a rugged resolver connected to a hybrid digital-analog circuit which generates output signals identical to those of a counterpart incremental encoder. The digital portion of the circuit includes terminals whereat absolute angle measurements of a shaft may be made.

Abstract: An in-line sander for hand held operation and having a housing in which a rotating electric motor drives a drive shaft to rotate on a first axis, with a second axis of the drive shaft canted to the first axis and supporting a bearing thereon. A bearing housing is supported on the bearing to orbit therewith, the bearing housing having an arm extending to a platen support and extensibly and pivotably connected to a portion thereof. This orbiting of the bearing housing influences motion of the platen support in accordance with the angle of the cone described by the second axis of the drive shaft. The platen support is made of a resilient material and carried by the housing on legs extending to a base portion, which legs have a low moment of inertia in the direction of in-line sanding, and a high moment of inertia normal to the direction of in-line sanding, so as to be disposed to motion in the in-line sanding path only.

Abstract: A coupling in the drive train between a sewing machine motor and mechanism for driving the sewing instrumentalities of the machine is provided with resilient bumpers. The coupling is further provided with tangs which interface with the bumpers in a manner that is effective to render the spring rate of the coupling variable and reduce both vibrational effects and impact forces in the machine.

Abstract: The specification describes a device that admits of performing a variety of servicing, inspection and maintenance functions on the viewing surface of a simulator dome. The structural arrangement of such device includes a circular track supported by the base floor of the simulator and at least one arcuate carrier track extending from one end at the circular track, upwardly in a plane perpendicular to the circular track and at a constant distance from the viewing surface, to the opposite end at the circular track 180 degrees from the end. A servo unit, carrying a desired implement to perform some function on the viewing surface, is indexed along the arcuate carrier track after the arcuate carrier track is turned 360 degrees. Suitable wheels support each end of the arcuate carrier track on the circular track.

Abstract: A hanging bobbin case in a sewing machine having a horizontal axis rotating hook is disclosed. The weight of the bobbin case is vertically supported by a finger portion of a bracket which is hingeably attached to the machine frame for easy removal of the bobbin. Projections formed in the bracket limit sideways movement of the bobbin case for preventing contact with the interior walls of the hook.

Abstract: A pushbutton control for a sewing machine is provided with a pivotably mounted carrier for a bell crank which is operably connected to a needle bar. Bight controlling movements are imparted to the needle bar according to the actuation of the bell crank and carrier.

Abstract: A clutch which is engaged to rotate and wind thread on a sewing machine bobbin is provided with clutch parts that include a single bladed paddle, and a member with a pair of crossed paddle receiving through slots, one of which has a chamfered upper edge that substantially widens the mouth of the slot and the other of which is without such chamfered edge.

Abstract: An internal gate rotary vane fluid meter which has markedly improved performance as a result of precise control over the geometry and dimensions of the rotating elements and the fluid flow path. In particular, the vanes are dimensioned to each have a length no greater than 1.5 times their width.

Abstract: A work holding clamp for a four hole button sewing machine includes a button holding foot formed with a needle accommodating aperture having an hourglass shape with four recesses arranged at the corners of a square pattern graphically to indicate to an operator the proper hole orientation.

Abstract: A presser attachment device for implementing needle feed in which a presser foot is elevated when a sewing needle is in engagement with work material to facilitate lateral shift thereof by the sewing needle. The presser foot is supported on one end of a substantially centrally pivoted presser foot carrier lever, the other end of which is formed with a gear segment. A pinion and ratchet combination is supported on one end of a pinion carrier lever, the other end of which is carried on the presser foot carrier lever pivot and has a pinion portion thereof in engagement with the gear segment. A combined cam and pawl is provided in which a pawl portion is in engagement with a ratchet portion of the combined pinion and ratchet when the sewing needle extends through the work material so as to lock the pinion against further rotation, depress the pinion and rotate the presser foot carrier lever to elevate the presser foot out of contact with the work material.

Abstract: An internal gate rotary vane fluid meter which has markedly improved performance as a result of precise control over the geometry and dimensions of the rotating elements and the fluid flow path. In particular, the outer diameter of the gate is the maximum possible which still allows the crescent to have an arc about the rotor axis which is sufficient to enclose the radial center lines of any adjacent pair of rotor vanes.

Abstract: An electronically controlled household sewing machine includes an arrangement for needle positioning. The machine responds to a tap of the foot controller for stopping the sewing machine at the next change of state of the armshaft timing signal.

Abstract: Visual system (37) for providing high detail, high resolution imagery anywhere a trainee is looking throughout a wide field of view. An image generation system (38) of visual system (37) accepts inputs from a helmet mounted oculometer system (30) which determines a trainee's instantaneous eye line-of-sight. The image generation system (38) provides a foveal view of high detail, high resolution imagery at the eye line-of-sight. The foveal view is projected on a screen (46) by a foveal projection system (40). The image generation system (38) further provides a peripheral view of low detail, low resolution imagery that is projected on screen (46) by a peripheral projection system (42). The foveal view is merged with the peripheral view by a merge electronics system (44).

Abstract: An internal gate rotary vane fluid meter which has markedly improved performance as a result of precise control over the geometry and dimensions of the rotating elements and the fluid flow path. In particular, the outer diameter of the gate is maximized and the inlet and outlet passages of the meter are shaped to perpendicularly intersect the rotor vanes when the vanes are sealing against the respective ends of the meter crescent. Furthermore, the inlet and outlet passages each have a total cross-sectional area substantially equal to a vane area to provide substantially constant fluid velocity.

Abstract: An in-line sander for hand held operation and having a housing in which a rotating electric motor drives a drive shaft to rotate on a first axis, with a second axis of the drive shaft canted to the first axis and supporting a bearing thereon. A wobble housing is supported on the bearing to orbit therewith, the wobble housing having an arm extending to a platen support and extensibly and pivotably connected to a portion thereof. This orbiting of the wobble housing influences motion of the platen support in accordance with the angle of the cone described by the second axis of the drive shaft. The platen support is made of a resilient material and carried by the housing on legs extending to a base portion, which legs have a low moment of inertia in the direction of in-line sanding, and a high moment of inertia normal to the direction of in-line sanding, so as to be disposed to motion in the in-line sanding path only.

Abstract: An internal gate rotary vane fluid meter is provided with a direct gearless drive between the rotor and the gate mounted on parallel displaced shafts inside a housing. A plurality of timing discs mounted on the rotor are utilized for drivingly coupling and synchronizing the gate to the rotor.

Abstract: A monolithic ring laser gyroscope is formed by six mirrors mounted to the respective center of each face in a cube. Bores in the cube interconnect each of the mirrors. Three orthogonal planes are defined within the cube, each of which contains a laser cavity. Accordingly, three orthogonal beam paths exist, each responsive to rotational inputs about three orthogonal axes.

Abstract: An incremental optical position sensing system utilizes a single laser beam and an out of focus grating which is between a pair of lenses whose focal planes coincide. The scanning laser beam passes through the first lens, scans the grating, passes through the second lens and impinges upon a pair of sensors. The phase correlation between the signals from the sensors is used to determine the direction of motion of the laser beam and an up/down counter is utilized to accumulate the absolute position of the beam.