Abstract: A mechanism for controlling the travel, velocity and stroke distance of a ram as used in punch and draw presses, and riveting machines, and a lever as used in automatic screw machines, feed mechanisms and indexing machines. In each embodiment the ram/lever is rotatably attached to a cam follower. When the mechanism is in the idle mode the cam follower is at rest in the idle area keeping the ram/lever motionless while the cam rotates. When the work mode is selected an escapement guide is actuated, causing the cam follower to transfer from the idle area into a cycloidal work groove intersecting the idle area. The work groove is configured to produce ram/lever motions commensurate with those required for the specific work piece. The mechanism uses fewer parts than are presently required for conventional machines is easier to maintain, more reliable and requires less power to operate.

Abstract: An apparatus is disclosed herein for translating an input power force into an increased power output via a power multiplier unit. The apparatus comprises a plurality of lever arms pivotal carried on supporting structure so that a portion of the lever arm extending beyond the pivot connection constitutes a cam surface upon which roller cams operate to convert up-and-down lever arm movement to rotary movement of a sprocket gear carried on a rotatable shaft. The roller cams associated with each lever arm are arranged with respect to each other so that the cams operate from the lever arms as the lever arms are driven differentially. An output drive shaft is operably coupled to the sprocket gear for receiving an imparted driving force thereto. Timing linkage interconnects the lever arms with the sprocket and its shaft for augmenting the translation of power by smoothing the transition of movement between the roller cams and the lever arm cam surfaces.

Abstract: A ramp lever is adjustably supported by a frame secured to the rail of a railway track. The lever has a shaft portion and a car wheel striking portion that extends upwardly from the shaft portion. The ramp lever is rotatably supported by the frame for movement between a raised position and a depressed position. The shaft portion of the ramp lever is connected through an indexing assembly to a drive shaft. A torsion spring extends in surrounding relation from the shaft portion to the indexing assembly. After the car wheel has passed over the ramp lever and depressed the lever, the torsion spring returns the ramp lever to the initial raised position. During the return stroke of the ramp lever to the raised position, the indexing assembly transmits rotation from the ramp lever shaft portion to the drive shaft. The drive shaft is disconnected from the ramp lever as the car wheel depresses the ramp lever to isolate the drive shaft from the shock forces transmitted by the car wheel.

Abstract: A synchronous demodulator is configured so as to extract gyroscope position nformation in a polar coordinate format and then resolve it into position information in a more useful cartesian coordinate format. The technique involves integration of a gyroscope cage coil signal over integration intervals controlled by spin reference signals rather than by the commonly noisy cage coil signal. Integration of the cage coil signal over intervals controlled by the spin reference signals yields outputs of .lambda. cos .theta. and .lambda. sin .theta. which are subsequently sampled and held and then summed to produce a precession coil drive signal whose phase is in the proper relationship to make the gyroscope precess in the correct direction.

Abstract: A compact hydraulic control device for use with mining apparatus is composed of a housing block containing tappet-operated valves. A multi-part cam shaft serves selectively to operate the valves by displacing the tappets by manual control effected by external levers. To automatically restore the cam shaft back into a neutral position as a "dead-man's handle" restoring system use is made of a pair of piston and cylinder assemblies mounted as detachable cartridges in parallel locations within bores in the housing block and having push rods which act on a cam of the cam shaft under the action of hydraulic or pneumatic pressure medium.

Abstract: A cam-actuated robotic manipulator system comprising an articulated robot arm adapted for multiple degrees of angular motion, and an actuator system which includes series-connected four-bar linkages and a cam input mechanism for controlling each degree of motion of the robot arm. The several series-connected four-bar linkages for each degree of motion share at least some common axes of rotation, one of which is position-variable for adjusting output position of the corresponding manipulator arm segment for a given cam input. The input mechanism to each four-bar linkage arrangement comprises conjugate cams and conjugate cam followers having an overload mechanism connected therebetween to detect obstruction to movement of the corresponding arm segment for disengaging the cam drive mechanism, and thereby preventing damage to the robot manipulator arm and actuator.

Abstract: A drive mechanism for a swiveling fan-jet sprinkler comprising a water-driven turbine, a reduction gear drive and, on the final drive shaft of the latter, a rotary cam member cooperating with a cam follower on the nozzle cylinder. The rotary cam member is preferably a swash plate with an elliptical torus-like rim, engaged by a fork-shaped cam follower. The mechanism may include adjustability of the swivel angle of the nozzle cylinder through a swash plate with an adjustable inclination on the final drive shaft.

Abstract: Machine for performing operations on strip material comprises a plurality of modules on a supporting bed. Each module has a strip feeder, a tooling assembly, and an actuating assembly. Strip is fed through the modules by the feeder and in each module the tooling assembly performs an operation such as stamping, forming, marking, etc. The modules feed the strip in a vertical plane and the modules are symmetrical with respect to the vertical plane of the strip. Preferably the actuating assembly and the tooling assembly is dynamically balanced. Advantages achieved include high speeds, reduced power requirements, reduced noise, and reduced tooling cost.

Abstract: The present positional gyroscope is used for stabilizing and steering a fng body, especially a secondary flying body ejected from a primary or carrier flying body which is rotating or rolling about its longitudinal or roll axis. Such gyroscopes are supposed to sense and take over the rolling position information from the gyroscope of the carrier flying body. For this purpose it is necessary that the gyroscope of the secondary flying body avoids course deviations. Hence, the gyroscope is supported in a first locked frame (3, 8) which in turn is suspended in an auxiliary rolling frame (4). A drive mechanism or motor (2) is connected to the rolling frame (4). The driving motor (2) may be switched on for rotating the auxiliary rolling frame (4) prior to activating or ejecting the secondary flying body.

Abstract: A drive unit for a cleaning device includes a pivotable drive member which is rigidly secured to a shaft imparting a working motion to a working tool brush of the cleaning device and worm gear unit operatively interconnected between a drive shaft of the drive used for the cleaning device and the pivotable drive member and provided with an eccentric rotatable with the worm gear of the worm unit and a guide engageable with a pin secured to the drive member for translating the rotational movement of the drive shaft to the shaft of the tool brush.

Abstract: The rocking lever for a cam mechanism presents a hollow box-type structure and consists of a modular base piece provided with the trunnions and with the cam follower rollers adapted to cooperate with the cams. The modular base piece presents two connection surfaces, arranged at 90.degree. with respect to each other, and adapted for the fastening of modular appendix pieces. The said modular appendix pieces can be secured in a removable and changeable manner to the modular base piece.

Abstract: A small press or cutting die assembly includes a small prime mover and suitable reduction gearing for driving an eccentric cam. A rockable lever bears on the cam either directly or through intermediate means, the lever being used to drive the pressing or cutting die assembly which is connected through shafts to the rocking lever and a stationary reaction member, respectively.

Abstract: A gyro assembly including a rotor, stator, hysteresis motor and conical hydrodynamic bearings for supporting the rotor relative to the stator.

Abstract: A lever operator for use primarily with valves of the plug type in which a tapered plug is raised to unseat associated slips and then rotated to a valve open position during opening of the valve and is rotated to a valve close position and lowered to seat the associated slips for closing the valve. The lever operator comprises an elongated lever arm having an eccentric cam at one end thereof connected to the trunnion of the valve to which the invention is assembled and also comprises a unique dual slot gate mechanism which houses the lever arm and restricts the motion of the arm to the requisite vertical and rotational movement which must be carried out in the appropriate sequence to properly operate the tapered plug mechanism of the valve.

Abstract: The present invention is directed to a gyroscopic instrument comprising concentric containers, the inner container enclosing a rotating electric gyro rotor, magnetic fluid enclosed between the inner and outer concentric containers, and magnetic flux producing means mounted on at least one of the two concentric containers, so that magnetic fluxes reach the magnetic fluid to support the inner container without contacting the outer container. The magnetic flux producing means are preferably mounted and oriented on a line drawn on at least one of the concentric containers at predetermined distances so that magnetic fluxes transmitted from the pole of one flux means reach the opposite pole of an adjacent means by passing through the magnetic fluid.

Abstract: The invention relates to a reciprocating member.The movable member is integral with one of the ends of a spring plate, whose other end is secured to a fixed frame, the said spring plate being held under pressure by way of a support member such as a cam driven in rotation.The invention finds an application in machines used for the manufacture of plastic bags.

Abstract: This disclosure is directed to an internal combustion engine having a plurality of double oscillating pistons disposed around the interior of the housing, each side of each oscillating piston having a cam arm which applies the force of combustion to a cam gear. The cam gear has a cam surface on its exterior which engages the cam arm and a ring gear on its interior which engages a plurality of planetary gears which in turn drive a drive shaft having a sun gear.

Abstract: A drive to reciprocate a vertical support member such as a shaft includes a journal support assembly which carries a lower end of the shaft while allowing rotational movement of the shaft. Located above the support assembly and attached to the vertical member is a reciprocation arm having a cam guide attached to its outer end. A cam assembly including an eccentrically offset cam bearing is disposed within the cam guide. The cam assembly is operatively connected to a source of rotary power which when energized reciprocates the support member in a selective oscillating cycle.

Abstract: A pinch valve for selectably controlling flow of fluid through one of two resiliently deformable tubes used e.g., for transporting water in a steam iron. The valve comprises a body member defining a compression surface supporting each one of the tubes. A selector lever is pivotally mounted on the body for selectably moving an integral cam abutment between individual tube shut-off positions. A rocker element supported on the tubes is captively held in the body member intermediate the selector lever and the compression surface for rocking movement between tube pinching positions. The cam abutment continually presses on the rocker causing the rocker to bear upon each one of the tubes on the compression surface. As the selector lever is pivoted, the cam abutment engageably slides along the rocker to rock the rocker between its tube pinching positions. The tubes are thus isolated from sliding contact with the cam abutment by the interposed rocker thereby preventing frictional wear of the tubes.

Abstract: A unitary hydraulic control device, especially for use with mining apparatus, has a main housing carrying replaceable individual valves arranged in bores. The valves are operated by tappets which engage on cams provided on one of three relatively rotatable coaxial parts forming a multi-part cam shaft. The rotatable parts have hand levers external to the housing permitting the parts to be partly-rotated in either direction, together or separately, to operate selected groups of valves. Each rotatable part has its own "dead man's" handle safety or restoring system which automatically return the rotatable part to a neutral position upon release of its hand lever and after part-rotation in either direction. Each such system is composed of a pair of spring-loaded plungers guided in casings fitted in the housing and engaging on diametrically-opposed cam surfaces of an additional cam on the associated rotatable cam shaft part.

Abstract: An apparatus for driving a plurality of units, in particular processing units on paper processing machines, which are arranged on the machine in the shape of a star. To allow the drive mechanism to be constructed more simply and more cheaply, but nevertheless to maintain the synchronism, the drive is effected from a shaft via a cam, crank or eccentric drive means and an actuating rod. The actuating rod causes a pivotally mounted actuator which is common to all units to oscillate to and fro, the actuator in turn bearing cams or crank pins and driving the units via tappets or cranks. The cams can be arranged in one or more rows and can also be exchangeable.

Abstract: A main body has a partition wall provided in the interior of the main body and a communication hole formed in the wall. A valve body is disposed in the main body to be movable between a first position and a second position. At the first position the valve body closes the hole, and at the second position the valve body opens the hole. A spring urges the valve body into the second position. An operating lever is connected in a universal-joint fashion to the main body. A cam is formed on the lever and slidably contact with a cam contact element disposed on the valve body in a position away from a plane including a center axis of the main body. A pair of grooves are formed on the lever at each side of the cam and extend along the plane. A pair of projections are provided on the valve body and inserted into the grooves. When the lever is rotated in one or the other direction in the plane by an external force, the valve body is moved between the first and the second position by the action of the cam.

Abstract: A two-degree-of-freedom gyroscope wherein a rotor is attached to and axially restrained by a taut wire fixed within the rotor drive shaft. Lateral or radial restraint for the rotor is provided by magnetic repulsion.

Abstract: A method and system for inducing and controlling nutation of a gyroscope momentum wheel (or member) so that such controlled nutation can be used for purposes such as target searching, acquisition and tracking, particularly in a guided missile system. A nutation command signal having a frequency integrally related to the natural nutation frequency of the gyroscope momentum member is generated, preferably is response to a momentum member position feedback signal. The generated nutation command signal is applied to a torquer to induce movement of the momentum member at the frequency of the nutation command signal. The amplitude of the nutation command signal is selectively controlled to control the amplitude of the induced movement and thereby control the movement of the momentum member through a desired pattern. In the disclosed embodiment, the momentum member controls the line-of-sight of a sensor such as a light or other electromagnetic wave energy detector.

Abstract: An inertial measuring unit which precesses about the direction of apparent acceleration as a consequence of the introduction of a mass unbalance to each of the gyroscopes in the inertial measuring unit. The mass unbalances and the rotational moments of inertia of the gyroscopes are carefully controlled so that all gyroscopes within the inertial measuring unit precess at the same rate about any apparent acceleration. The precession of gyroscopes causes certain of the gyroscope errors to be averaged about zero thus reducing the error in the inertial measuring unit. The effect of precession upon the spatial orientation of the inertial measuring unit is compensated for by sensing the apparent acceleration and computationally compensating for the precession due to such acceleration.

Abstract: A device for compensating for gyro wheel frequency inaccuracies wherein a reference oscillator feeds a square wave signal to a first and second counter. The second counter also has an input of plus or minus the spin axis angular rate. The first counter scales down the reference signal and the second counter generates a signal having a frequency proportionately higher than the first counter. The output of the second counter provides a signal indicative of angular spin rate displaced from the input gyro axis. The outputs from the first and second counters are fed to an up/down counter which combines the two signals to provide for gyro wheel compensation.In a second embodiment of the invention a computer having spin rate axis signal from two gyros, control two settable counters to obtain compensation of the gyro wheel of a first and second gyro.

Abstract: A cam drive is used to control the picking movement of the picking lever. The cam drive includes a dam disc which has a recess (or projection) which causes the lever to accelerate at the beginning of a pick and thereafter imparts a prestress to the spring before the cam follower of the lever moves out of the cam disc recess. A dog clutch is used to permit movement of the cam disc relative to the uniformly rotating drive shaft.

Abstract: A control device for driver member comprises an intermittently movable driver member, a follower member adapted to follow the driver member for displacement, retention and return displacement, a control member for controlling the starting and stoppage of the movement of the driver member, and a first and a second signal for starting the movement of the driver member. The movement of the driver member may be started by the first signal to displace the follower member to bring about the retaining position, whereafter the movement of the driver member may be automatically stopped by the control member, and the movement of the driver member may be restarted by the second signal and at the position whereat the return displacement of the follower member is completed, the movement of the driver member may be automatically stopped by the control member.

Abstract: Disclosed is apparatus and method for accurately determining the direction of true north or the change in drift of other gyroscopes. The apparatus comprises a single degree of freedom gyroscope driven by a permanent magnet electric motor. The gyroscope rotor is spun by the motor at varying speeds and the torque required to maintain the rotor at a null orientation is measured and recorded. The measured torques are processed to produce an accurate indication of true heading or to indicate the change in the level of drift of other gyroscopic instruments.

Abstract: Mechanism for varying the timing of the valves of an internal combustion engine to obtain optimum efficiency and performance of the engine throughout a substantial portion of its operating speed range, wherein cam means for at least each intake valve is mounted on a rotatable cam shaft of the engine. Each cam means includes at least one and preferably a pair of axially spaced first cam members contoured to provide a first timing for their associated valves such as to provide optimum performance throughout one operating speed range of the engine and a second cam member of smaller size than and positioned between the first cam members and contoured to provide optimum performance throughout another operating speed range. Timing of the valves is normally controlled by the first cam members acting through linkage connected to the valves, and a plurality of elongated finger followers are provided for coaction with the second cam members to render them effective to control the timing of the valves.

Abstract: A cylindrical cam is obliquely mounted on a drive shaft to be shiftable in the axial direction. The cam and the drive shaft are concentric at the axial center and the eccentricity of the cam increases gradually towards the opposite ends and in opposite phases. A pair of contact members carried by a follower member engage the opposite sides of the cam. As the drive shaft is rotated a reciprocating motion is imparted to the follower member and by shifting the cam in the axial direction the amplitude of the reciprocating motion can be varied.

Abstract: In a gyroscope including a rotor spinning about a spin axis, the rotor gimballed about two mutually perpendicular axes and including cross coupled closed loops operative on the two mutually perpendicular axes so as to be able to detect rates about said two axes, a feedback loop is provided to cause the gyroscope spin axis to nutate in a cone about its nominal, blind, spin axis at a controlled amplitude and at a frequency which is at least close to the natural nutation frequency of the gyro and the nutation detected and changes in the nutation amplitude or frequency used as a measure of the rate about the blind axis.

Abstract: An electrical circuit interposed between the pickoffs and torquers of a two-axis gyroscope. The circuit output controls the torquers. When the pickoff signals vary at the nutation frequency, the angular accelerations produced by the torquers damp the nutation. No angular accelerations are produced when the pickoff signals are not varying and only negligible angular accelerations are produced when the pickoff signals vary at a frequency other than the nutation frequency.

Abstract: A control arrangement for controlling the movement of an oscillating lever so as to allow the lever to exert a force of predetermined magnitude on an article placed in its path. Control of the lever is effected through a transmission mechanism which operably connects a control cam between the oscillating lever and an auxiliary lever in contact with the cam. A setting control sets the interacting force of the two levers to a predetermined value, such that, if the oscillating lever in the course of its movement in a first direction arising from rotary movement of the cam is arrested by an article arranged in its path, the force exerted by the oscillating lever on the article is at least equal to the predetermined value multiplied by the ratio between the distance which separates the shaft of the oscillating lever from the point where the interacting force is exerted on the lever, and the distance which separates the same shaft from the point where the oscillating lever is in contact with the article.

Abstract: A timer mechanism for controlling a thermostat having a control shaft, the mechanism comprising: a frame, a synchronous motor mounted in the frame, a first and second lever pivotably mounted on the frame so as to be able to take an operative and an inoperative position, cam motion transmission means operatively connected to the said motor so as sequentially to pivot the said first lever from its inoperative to its operative position, while pivoting the said second lever to its inoperative position, and from its inoperative to its operative position, while pivoting the said second lever to its operative position, first transmission means operatively connected to the said motor and controlled by the said first lever to rotate the said control shaft in a first direction when the said first lever is in its operative position, and second transmission means operatively connected to the said motor and controlled by the said second lever to rotate the said control shaft in the opposite direction of rotation when the

Abstract: A gyro seeker which is capable of use in a cannon launched missile. The gyro seeker is enclosed in a housing mounted in the nose section of the missile. The platform of the gyro seeker supports an optical assembly, a detector, a gyro assembly, and a cryostat for cooling the detector. Means are provided on the outer gimbal of the platform for withstanding the extreme acceleration induced by cannon launching. The platform is torqueable along two axes by a plurality of pole pieces located around its base. A platform caging device is provided to cage the platform during transport and serves a dual function as a means to furnish spin-up gas to the gyro element and cooling gas to the cryostat.

Abstract: A horizontally rotatable and vertically elevatable power boom is disclosed. The boom includes a link providing increased lifting torque about the boom hinge pin and the boom assembly is designed for minimizing the head room requirements for the vacuum machine without sacrificing payload capacity. The link also permits the boom to be locked down hydraulically for traveling.

Abstract: A system for providing a stable caging loop for two-degree-of-freedom dry tuned gyros used in a strap-down inertial navigation system. The system provides satisfactory noise rejection and good navigation accuracy using cross axis torquing only with extremely simple analog shaping circuits in place of the combination of cross axis and direct axis torquing with complex shaping circuitry that is normally required with these gyros in such an application. A 64 Hz bandwidth loop is provided with less than 1.degree. phase lag below 5 Hz, 10 db attenuation of rotor spin rate noise, and at least 35 db attenuation of all higher frequencies. Its performance is such that it can be used in a navigation system requiring accuracy on the order of one nautical mile per hour in a typical missile environment.

Abstract: Apparatus for transversely sealing a wrapping tube includes opposed sealing tools movable in unison linearly along an operating path having a beginning and an end while sealing a wrapping tube. The tools return from the end of the operating path to the beginning thereof by moving along arcuate return paths. Crank mechanisms for so moving the tools include cam tracks and cooperating cam followers. The cam followers are urged against the cam tracks under the influence of centrifugal force during movement of the tools along the return paths.

Abstract: A gimbal system is disclosed in which low static friction hydraulic motors drive two concentric movable rings in orthogonal planes. For each ring, the drive shaft of the motor is part of one supporting axle. The other supporting axle is coupled to a shaft position encoder. The motor is mounted so that only rotational motion is imparted to the ring, and the encoder is mounted so that only rotational motion is read out.

Abstract: A hydrostatic transmission drive pump swash plate control including a control arm and a cam which are mounted on axes perpendicular to one another. The control arm is connected to the swash plate to effect simultaneous movement of the control arm and swash plate. Cushioned link means operatively interconnect the cam and a manual control member. The cam includes a cylindrical portion with a cam slot which is shaped similar to the first 90.degree. of a sine wave between full speed reverse and neutral and similar to the first 90.degree. of another sine wave from neutral to full forward speed. A resilient cam roller on the control arm absorbs fluctuating stroking forces of the pump and cooperatively engages the cam slot to produce a low rate of ground speed change near the neutral condition of the hydrostatic transmission and also near maximum forward and maximum reverse ground travel speed.

Abstract: A needle jogging mechanism for zigzag sewing machines which employs an edge cam driven by the main drive of the sewing machine. This cam is embraced by a pair of roller followers each carried on one of a pair of parallel follower levers interconnected by a cross-link the pivotal fastenings of which include eccentrics for adjusting the followers against the cam. An additional link is also provided for transferring the movement of the follower levers to a needle bar gate.

Abstract: Means for varying the preload bias forces in the suspension system of an electrostatic gyroscope as a function of acceleration forces to which the gyroscope is subjected. Under zero acceleration environment, the preload bias forces are maintained at a low level to keep at a minimum the errors due to gyro drift introduced by bias forces. With an increase in acceleration, bias forces are automatically increased, thereby providing the gyroscope with high "g" capability without sacrificing low "g" performance.

Abstract: A cam and follower construction in which a flat plate has a plurality of cam grooves intersecting each other and in which the cam followers are in the form of cylindrical pins or rollers, one in each cam groove. To insure that each follower stays in its own groove and does not accidentally pass into the wrong groove at the point where they intersect, the grooves are made of different widths and different depth, the widest groove having the shallowest depth and the narrower groove having a greater depth. Thus the follower of a wide cam groove cannot pass into an intersecting narrower groove because the groove is too narrow to receive the follower, and the follower of the narrower groove cannot pass into the wider groove at the intersection, because the narrower groove is deeper and the shallower wide groove cannot accommodate it.

Abstract: A punch device for coding cards, tapes and the like comprises a pivotably mounted spring biased punch lever, and a punch member for punching a code into a program card or the like movably mounted on one end of the punch lever. An oscillatable yoke is connected to the punch lever through a hammer lever. A rotating eccentric drive rotatably mounted in the yoke continuously oscillates the yoke. An electromagnetically actuable pawl is reciprocably movable against a spring biased trigger lever for pivoting the trigger lever into a position between an end of the hammer lever and the end of the punch lever in which the punch member is movably mounted. When the trigger lever is moved by the pawl between the hammer lever and punch lever, the oscillation of the yoke by the eccentric drive upwardly moves the punch member into a punch position.

Abstract: Motor rotated cams each actuate a lever and each lever is connected by a flexible non-extensible member, cable or chain, to the element of the machine to be controlled. A spring loaded bell crank lever is provided for each flexible non-extensible member and the non-extensible member passes over a pulley mounted at one end of an arm of the bell crank lever. Each arm of the bell crank lever actuates an electric switch connected to a motor whereby if the tension in the flexible non-extensible member increases or decreases excessively the appropriate one of the switches is opened to stop the motor.

Abstract: A valve train comprises a cylinder head and poppet valve thereon, a valve-actuating rocker platen pivotally mounted on the cylinder head by means of a pivot member so that the platen may pivot between positions on either side of the member, a valve connected to one end of the rocker platen for movement of the valve simultaneously with movement of the rocker platen between the rocker platen positions, and actuator means for moving the rocker platen between the positions thereby positively moving the valve between its open position and its closed position, the actuator means comprising a rotary cam means and cooperating follower pivotally mounted and spring biased into engagement with the rocker platen and engaged with the cam means for pivoting the rocker arm upon rotation of the cam means, the follower comprising a pivotally mounted casing, spring biased plunger means on the casing, and biased to a roller bearing on and adapted to ride over the rocker platen, thereby moving the platen between the positions, t

Abstract: A torquer system for a gyro device that has a spherically shaped rotor divided into upper and lower hemispheres. The rotor of the gyro is mounted on a gas bearing over a spherically shaped stator and supports an optical assembly positioned parallel to the spin axis of the gyro. The torquer is positioned on the base of the gyro beneath the lower hemisphere of the rotor so as to permit the maximum angular freedom of the rotor and optical assembly. The torquer comprises four pole pieces separated 90.degree. from each other. Each torquer has two pole faces and coils located between pole faces. The coils contain separate windings for bias and control of the torquer. A current flow through the windings of the torquers causes magnetic flux lines emanating from the pole faces to pass through magnetically permeable material affixed to the lower hemisphere of the gyro rotor closing the magnetic circuit.

Abstract: A non-tumbling limit stop for limiting the relative motion between a strure and a gyroscope pivotably mounted thereon. The limit stop employs frictional contact forces to cause the gyroscope to precess away from the stop rather than tangent to it, and thus preventing tumbling of the gyroscope while enabling high slew rates of the gyroscope spin axis.

Abstract: An adjustable welding head oscillator in which rotary motion is transformed into sinusoidal reciprocatory motion and transferred to a welding head. A cam follower is adapted for receiving rotary motion from an eccentric arm and translating the rotary motion into sinusoidal reciprocatory motion. The cam follower is mounted on a swing bar having another point along its length connected to the cam follower which is reciprocated with the same amplitude as the cam follower. The welding head is attached to the reciprocating swing bar at selected points along the length of the swing bar. The amplitude of oscillation of the welding head is adjusted by varying the location of the welding head with respect to the swing bar.