Abstract: A brush board for a dynamoelectric machine is formed with resilient arms which are an integral part of the board and have commutator engageable brushes affixed at the free ends thereof. The board carries printed circuitry which extends to the free end of the arms and connects with the brushes.

Abstract: A portable electric drill is provided with a keyless slidable jaw chuck having three slidable jaws provided with externally extending teeth mounted within a chuck body having three slideways for the chuck jaws and a traverse nut rotatable on the chuck body having internal threads engaged with the chuck jaws, and a locking shell slidable relative to the traverse nut so as to rotate together relative the chuck body. Teeth, lugs or other projections on the rearward annular face of the shell selectively matingly cooperate with teeth, lugs or similar projections provided on the drill housing so that, when the shell is slid rearwardly towards the drill housing the shell and traverse nut are held against rotation relative the drill housing upon actuation of the drill to rotate the chuck body, the chuck jaws will be automatically extended or retracted, depending upon the drill rotation direction, to chuck or unchuck a drill bit or other accessory inserted therebetween.

Abstract: An optical switching system for one step buttonholing substantially eliminates false triggering when an operator inadvertently moves an object within the viewing path of the optical sensor by utilizing signals from the sensors only when the sewing machine is running.

Abstract: An electronically controlled sewing machine includes an arrangement for operating the machine in a diagnostic mode, wherein several tests for checking the functioning of the sewing machine can be performed. In a first test, all of the light emitting diodes on the panel of the sewing machine are sequentially energized. This verifies proper operation of the display panel. In a second test, a particular light emitting diode responds to the armshaft sensor such that it is dark when the needle is up and is illuminated when the needle is down. The motor speed function is monitored by a test which lights particular light emitting diodes in 100 stitches per minute increments of motor speed. Proper overall operation of the sewing machine, including the actuators, is monitored by running several test patterns. To isolate a possible fault in the sewing machine foot controller, the sewing machine may be run at a preset speed without depressing the foot controller.

Abstract: A pressure relief valve includes a two-piece housing having therein a generally circular diaphragm backed by a spring biased plate. The outer edge of the diaphragm is captured between the two pieces of the housing and to provide a first sealing area. The central portion of the diaphragm has a circular opening therein with an annular sealing lip formed thereabout. The sealing lip provides a seal when the spring biased plate moves the diaphragm against a flat circular seat. When pressure at the inlet of the housing overcomes the spring biasing force, the diaphragm is moved away from the seat and the gas is relieved through an outlet in the housing.

Abstract: A suction cleaner having a chassis including a suction nozzle inlet at the bottom thereof and first and second sets of wheels supporting such chassis for movement on a floor surface is provided with a nozzle height adjusting mechanism comprising first axle means carried by said chassis for rotatably supporting said first set of wheels, second axle means including a central portion having a pintle shaft mounted therewith and with the chassis for enabling rocking movement of said axle means relative said chassis, an actuating portion on one side of said pintle shaft, and a pair of offset arms formed on an opposite side of said pintle shaft extending laterally outwardly thereof for journaling said second set of wheels, said offset arms being longitudinally spaced from said first axle means, an adjustment lever journaled on said chassis having one end portion angulated to engage said actuating portion so that rocking movement of said adjustment lever rocks said second axle means about said pintle shaft and thereb

Abstract: A light sensing device for a sewing machine with a sensing circuit which automatically compensates for the work fabric being utilized so as to be able to detect a ply change event in any fabric without requiring an operator adjustment for the type of fabric being stitched upon. Being able to detect a ply change event without the necessity for adjustment also permits automatic operation of certain sewing machine components, further facilitating operation of the sewing machine.

Abstract: A full wave motor control circuit is provided which utilizes a phase fired SCR to control the flow of current through the motor windings. Just before the end of each cycle, the charging capacitor which is connected across the gate and cathode of the SCR is discharged and the effective holding current level of the SCR is raised to insure SCR turn off.

Abstract: A gas flow volume corrector mounted on a flow meter is provided with a microprocessor which calculates a corrected volume each time the meter measures a unit volume of flowing gas. Customer supplied data as to base conditions, specific gravity and gas composition are utilized to calculate supercompressibility values. These values are then processed to provide a plurality of constants which define calculation equations. The constants are stored in the corrector on a diode matrix card or PROM and are utilized each time the meter measures a unit volume of flowing gas for calculating the corrected volume. To conserve memory space, integer arithmetic, rather than floating point arithmetic, is utilized in the calculations.

Abstract: A thread engageable finger for guiding needle thread into a thread receiving slot on the bobbin case of a sewing machine, as a seized loop of the thread is moved about the bobbin case by a looptaker, is provided along a thread engaging edge with a predetermined curved contour effective to delay movement of the thread along said edge until the introduction of thread into the bobbin case slot as required for bobbin winding is assured.

Abstract: An SCR motor speed control system having a capacitor for triggering the SCR into conduction is provided with circuitry for limiting the top speed of the motor by sensing the armature back EMF generated during the non-conducting period of the SCR to determine the motor speed. When the speed is above a predetermined threshold value, a transistor is turned on to short circuit the charging path of the capacitor.

Abstract: A reduced load presser bar mechanism having a separate secondary spring that may easily be disengaged or engaged by the operator to counter balance the biasing force of the primary presser bar spring thereby reducing the normal force exerted by the presser foot on the work piece to near zero.

Abstract: An embroidery attachment for a sewing machine having electronic controls influencing the stitch forming instrumentalities. The attachment work holding frame is shifted by operative connections with the stitch forming instrumentalities. Alternative constructions are disclosed utilizing electronically controlled sewing machine needle bar and feed dog movements to drive the embroidery attachment.

Abstract: A relatively rigid needle pack comprising only a web of flexible material and a plurality of sewing machine needles arranged in groups of from about 3 to about 25 with their shank portions parallel and contiguous one another and the blade portion of each of the plurality of needles pierces the web to define a line of concatenated fenestrations. The web is wrapped tightly around the needle shank portions to secure the shank portions closely together forming a relatively rigid strip package containing about 3 to about 25 needles per strip. The web may be severed between groups of needles, forming separate packages or a plurality of groups of needles may be retained in a single uninterrupted web for multiple unit packaging.

Abstract: A control mechanism is attached to a sewing machine frame with a bayonet type connection including a slotted plate on the control mechanism and a spring biased pin which is axially movable in the frame and is extendable through an enlarged one end portion of a slot in the plate. The pin includes an enlargement which, when the plate is turned is caused to enter an opposite end portion of the slot and lock the control onto the frame.

Abstract: A single air gap motor is provided with inner and outer coil wires in armature slots. Inner and outer coils with the same number of turns are symmetrically distributed around the armature and are connected in series with inner and outer coils alternating in the connection to balance out back E.M.F.

Abstract: A presser foot for a sewing machine is formed of plastic with upstanding spreadable legs including protuberances which snap into countersunk portions of a through hole in a shank to provide a pivotal mounting for the foot on the shank in the machine.

Abstract: A control arm for bobbin winding mechanism in a lockstitch sewing machine is provided with a pawl which serves both to guide needle thread into a thread entering slot for a tensioning device on a bobbin case, and to hold an arm of the tensioning device in a position effective to prevent the thread from being pulled out of the slot.

Abstract: A mechanism in a sewing machine wherein two or more stitch forming instrumentalities may be individually actuated independent of all other stitch forming instrumentalities by a single actuator.

Abstract: A motor operated circular miter chop saw is pivotally mounted on a generally horizontal axle pivot pin about which it rotates in a vertical plane with the axle pivot pin being carried by a cast support base structure provided with means allowing both lateral adjustment and vertical adjustment of each end of the axle pivot pin. Angular orientation of the work piece is provided by an angularly adjustable fence rotatably carried by the cast base.