Abstract: A tension compensator for use on a package winder has two spaced pins projecting from a rotatable member, the pins being parallel to the axis. The member is biased to rotate in a predetermined direction to a stop, so that a strand passed between and over said pins in zig-zag fashion moves the pins against the bias to straighten the strand under higher tension and permits the bias to move the pins to store the strand under lower tension. The compensator is made self-threading by providing a ramp to deflect the strand over the end of one pin when traversing past the pin in one direction, and a strand-guide to deflect the strand over the extremities of both pins and the ramp on the initial traversal of the strand in the opposite direction.

Abstract: Fanfold paper is progressively withdrawn from the bottom of a container, fed past a printing mechanism, transported upwardly and deposited in fanfold configuration at the top of the container.

Abstract: A triaxial weaving machine of modular construction comprises separable warp supply and weaving modules to simplify manufacture and permit more efficient use of the machine. Modules of the same kind are interchangeable.

Abstract: An automatic control system wherein repetitive pulses, the frequency of which is responsive to a remote condition, such as prime mover RPM, are converted to a DC voltage level. The voltage level is compared to a reference by a difference amplifier to produce an error signal. Further signals are produced from the error signal which are ultimately used to control the remote condition. The gain of the amplifier is externally adjustable depending upon conditions relating to the prime mover load conditions.

Abstract: A force-balance transmitter for producing a pressure signal proportional to the enthalpy of air has a flapper associated with a nozzle and employs a control force acting on the flapper in opposition to a feedback force applied to the flapper by the controlled fluid pressure acting over the area of the nozzle, the control force being produced by the combination of forces exerted on the flapper by two resilient beams subjected to individual bending moments responsive to sensed temperature and sensed humidity respectively.

Abstract: A thermal printhead has heating elements arranged for multiplexing so as to limit the number of leads required to selectively energize the heating elements. Current diverting resistors are utilized to act as a shunt path to divert current from certain of the heating elements to prevent unwanted shadows from being produced on the thermal sensitive paper.

Abstract: An automatic control system wherein repetitive pulses, the frequency of which is responsive to a remote condition, such as prime mover RPM, are converted to a DC voltage level. The voltage level is compared to a reference by a difference amplifier to produce an error signal. Further signals are produced from the error signal, including an integral thereof, which signals are ultimately used to control the remote condition. The integrator is provided with an offset circuit to prevent saturation thereof during override of the normal control signal by an external limit signal as, for example, excessive engine temperature or smoke output.

Abstract: An actuating device is disclosed which is modular in construction. The device employs a modular head having a rotatable output shaft for controlling valves, etc. One or more force motors are arranged to actuate the output shaft according to the required application. The force motors are electromagnetic and can accurately position the output shaft as a function of applied current.

Abstract: An automatic control system wherein repetitive pulses, the frequency of which is responsive to a remote condition such as prime mover RPM, are converted to a D.C. voltage level which is then compared to a reference to produce an error signal. Three further signals are then produced, one proportional to the error signal, one proportional to its integral and the other proportional to its derivative. The three further signals are summed and amplified to the extent necessary and the resultant used to control an element which in turn controls the remote condition. Included is a fail safe circuit effective to cause the remote condition controlling element to shut off in the event incoming pulses are not present. Provision is made whereby the system may respond to the summed signals described above or an external signal which may be derived from a function generator or a limiting value established by an external condition.

Abstract: The control cycle for an injection molding machine comprises successive fill, compaction, hold, cure and mold open times. The ram position and mold pressure are monitored at predetermined times respectively after the molding cycle has begun. If the ram position is out of tolerance, the fill pressure is adjusted to compensate for the deviation. If the mold pressure is out of tolerance, the compaction pressure is adjusted to compensate for the deviation in mold pressure.

Abstract: A triaxial fabric weaving machine in which a plurality of elongate heddles for guiding warp yarns are arranged in weftwise rows and are shifted weftwise of the rows to thereby move the warp strands from one weftwise location to another. During weaving, heddles are supported by stationary guides and are moved longitudinally relative to the stationary guides for forming the warp strands into warp sheds in which wefts are inserted.

Abstract: A butterfly damper, controlling volume air flow through a duct, is biased toward a closed position at least partially by aerodynamic pressure and is moved against its bias by a small pneumatic actuator in response to a sensed condition. The position of the damper is stabilized by a feedback and oscillations are damped.

Abstract: A weaving machine for making triaxial fabrics in which heddles are positioned in weftwise rows of parallel heddles, moved longitudinally during warp shed formation, and shifted weftwise. Heddles of the weaving machine of this invention have means thereon for preventing entrance of more than one heddle into the same passageway, in the form of weftwise lateral projections for engagement with an adjacent heddle so as to facilitate proper guidance of heddles in the weftwise row into guiding passageways during longitudinal movement and weftwise shifting of the heddles.

Abstract: A heddle selecting and positioning apparatus for a warp drawing-in machine has a rotatable selector for alternately releasing front and rear duplex heddles and has a positioning mechanism for transporting a selected heddle to a threading position and holding the heddle in position during threading. The positioning mechanism engages the heddle above and below the heddle eye to insure proper alignment for threading.

Abstract: A weaving machine for making triaxial fabrics and which has a plurality of heddles arranged in weftwise rows for guiding warp strands, an arrangement for shifting warp strands weftwise during weaving, and a creel for supplying warp strands and for rotating in timed relation with the weftwise shifting of the warp strands. In accordance with the present invention, structure is provided for guiding warp strands passing from the creel to the heddles along substantially constant length paths and takes the particular form of a generally circular upper guide having a diameter less than the weftwise length of the rows of heddles and a lower guide arrangement substantially in weftwise alignment with the rows of heddles and yarn separators for the warp strands which move in timed relation with weftwise shifting of the warp strands and rotation of the creel.

Abstract: A weaving machine for making triaxial fabrics in which a creel for supplying warp strands is mounted for rotation about a generally vertical axis in timed relation with interweaving of warp strands and wefts. In accordance with this invention, weaving instrumentalities for interweaving warp strands and wefts include a plurality of elongate heddles arranged in weftwise rows for guiding warp strands and means for moving the heddles and the warp strands guided thereby weftwise in timed relation with interweaving of warp strands and wefts.

Abstract: A triac controlling current from an AC line to a load is protected against excessive transient voltages on the line by a protection circuit that turns on the triac when excessive positive or negative transient voltages occur so that the resultant power is dissipated in the controlled load.

Abstract: A motor or generator having a commutator and brushes for transfer of current to and from rotor windings has a stationary conducting sensor in sliding contact with the commutator, said sensor being narrower at its contact with the commutator than the insulation between the commutator bars where contacted by the sensor, so that a sensing circuit is interrupted between the sensor and one of the brushes at a frequency proportional to the speed of the rotor.

Abstract: High-speed tool steel cutting blades are inserted in slots in an inexpensive core and retained therein by a high-strength structural anaerobic adhesive.

Abstract: A rapier of a weft inserting mechanism in a vertical weaving machine has an associated guide for engaging a cooperating rapier to prevent substantial divergence of the rapiers when they come together so as to facilitate transfer of the weft yarn from one rapier to the other during weft yarn insertion.