Abstract: In a heavy-duty pump jack as used in oil well pumping, a leverage beam is oscillated by a motor-driven crank and the leverage beam acts upon the walking beam through an adjustable stroke controller.

Abstract: A bell-crank lever having substantially stiff lever arms, which are approximately at right angles to each other, is connected to a stationary part by a film hinge that is secured adjacent to the junction of the lever arms and defines a bending axis which is at right angles to the plane of the bell-crank lever. An oscillating arm is secured to the free end of one of said lever arms and extends approximately parallel to the other of said lever arms and about film hinges which define bending axes that are at right angles to each other is bendable in the plane of the bell-crank lever and at right angles to that plane. An oscillating beam bar is connected to the other of said lever arms by a film hinge defining a bending axis at right angles to the plane of the bell-crank lever. The oscillating arm has in its free end portion a bearing bore for connection to a driving crank pin. The oscillating beam bar is substantially aligned with the axis of rotation of said crank pin.

Abstract: An irregular-motion mechanism comprising two series-connected double cranks each comprising a driving link and a driven link connected thereto by a connecting rod, the driving link of the first double crank and the driven link of the second double crank being mounted for rotation about a common axis, the driven link of the first double crank being rigidly joined to the driving link of the second double crank, the driven link of the first double crank forming an obtuse angle with the driving link of the second double crank the ratio of their lengths being about 2:3 with a length-ratio range of about 3:2 to 5:4 for the driving link of the first double crank and the driven link of the second double crank, and with a length ratio of about 1:1 for the connecting rods of the first and second double cranks. The device provides a considerable increase in power in the extreme positions of irregularity because of the obtuse angle.

Abstract: An apparatus for bonding wires on semiconductors is provided with a processor controlled vertical drive mechanism coupled to a novel bonding head of the type having a bonding tool mounted therein. The height of the bonding tool at the reset position and at the bonding position may be programmed into the processor for different semiconductor devices or workpieces. Indicating means are provided on the novel bonding head for establishing the reset position and the bonding positions so that the bonding tool is taught a series of predetermined vertical positions during a bonding cycle. The apparatus is also programmed to compute intermediate positions between said predetermined vertical positions to obtain optimum high speed movement of the bonding head and the bonding tool during subsequent bonding cycles.

Abstract: The invention relates to a servo motor assembly in which the linkage is provided between a linearly movable motor part and a rotatable member being controlled. The linkage includes two separate links and the arrangement prevents or minimizes lateral reaction forces from being applied to the linearly movable motor part which would cause undue wear on the bearings thereof.

Abstract: The lower end of a crank from an internal combustion engine is pivoted on one side of the center of a small gear which in turn is mounted for rotation to one side of the center of a relatively large drive gear. A stationary gear is concentric with the drive gear and an idler gear is mounted for rotation to the drive gear and engages the small gear and the stationary gear. The drive gear engages a take-off gear to transmit power from the piston via the crank and gears. The gear ratio of the small connecting rod gear and fixed gear is such that the small gear rotates at twice the speed of the large gear. The connecting pin of the small gear is furthest from the center of the drive gear at top dead center and bottom dead center and nearest to the center at 90.degree. from top dead center and bottom dead center so that when at top dead center, the crank has the highest mechanical advantage and at 90.degree. therefrom, the lowest mechanical advantage.

Abstract: A mechanism is described for effecting movement of an object, article or device in a closed loop planar path while maintaining the major axis of the object, article or device in substantially fixed attitude in the execution of at least an appreciable portion of the path, the mechanism comprising a six-bar linkage the dimensions of which are derived from a four-bar linkage to ensure the fixed attitude motion during motion through at least the appreciable portion of the closed loop path.

Abstract: An engine includes a block having at least one cylinder in which a piston reciprocates. The piston is connected through a piston connecting rod to a lever arm, and the lever arm is in turn connected to the eccentric crank pin of a crankshaft through a crank connecting rod. The lever arm is positioned and moved not only by the piston and crankshaft, but also by a positioning cam which bears against one end of the arm. The arrangement is such that throughout the entire power stroke the force transmitted to the crankshaft is applied through a relatively large moment arm, thus providing greater torque for the engine. The arrangement results in a relatively large angle between the crank connecting rod and the crank arm and permits greater eccentricity on the crank arm.

Abstract: An apparatus mounted on a weaving loom for moving a weft thread carrying mechanism from one end of a loom lay to the other through the shed of the warp threads. The apparatus includes a linkage having a drive mechanism which is rotated continuously and which maintains the weft thread carrying mechanism in a fixed position for an extended dwell period and then propels the weft thread carrying mechanism across the lay after the lay has beat up a prior weft thread and has been retracted to an inoperative position. The apparatus provides a substantial reduction in the noise level and power requirement over conventional looms and permits the speed of operation to be increased to improve production.

Abstract: Apparatus for driving the lay of a weaving loom and including one or more four-bar linkages arranged independently, in parallel, or in series with one another in a manner to advance and retract a loom lay during a fractional portion of the rotation of a crank and providing an extended dwell period for the lay during the remaining portion of the rotation of the crank.