According to the present invention, in a sewing machine, a cylindrical frame for retaining tubular objects is mounted integrally on a cylindrical drive ring that is reciprocally driven in a rotational direction around a cylinder bed and that is linearly reciprocally driven along an axis of the cylinder bed; the drive ring is rotatably supported by a support member that is arranged to contact the outer periphery of the drive ring at three or more positions. By utilizing this construction, not onl...

For improving characteristic uprising at the right-hand side of head-flow rate characteristic of a turbo machine, as well as for suppressing increase of vibration and/or noises thereof, a plurality of first grooves 24 in direction of gradient in pressure of fluid are formed on an inner flow surface of a casing, for connecting an inlet side of blades of an impeller and an area on the inner flow surface of the casing where the impeller blades reside in, over an inner circumference of the casing. A...

Fastener delivery apparatus for automatically selecting and delivering fasteners such as rivets to a setting tool. The fasteners are pre-loaded in a package and dispense via at least one fastener delivery tube that interconnects the setting tool to a fastener feeder device. The fastener feeder device releases selected fasteners from the package into the delivery tube. The fasteners are transportable individually or in groups in the tube from the feeder device to the tool. A transfer station atta...

An electrical machine comprises a rotor without windings, a stator having an armature winding 24, 25 and a field winding 10 for generating a magnetomotive force in a direction extending transversely of the magnetomotive force generated by the armature winding. An electronic circuit 40 is provided for controlling the current in the armature winding 24, 25 such that periods in which a magnetomotive force in one direction is associated with a first current pulse alternate with periods in which a ma...

A number of gaming machines, such as fruit machines, are linked through a common control unit to a display which shows to all the players of the machines a range of prizes. When there is a special win on any machine, a selection is made from those prizes and the chosen one awarded to the player. As the prizes are won, so those on offer reduce, but once a star prize, of greater value than any of the others, is awarded, the full range may be restored. There can also be treasure chest keys on the d...

An electrical machine, such as an electric motor, dynamo or alternator has a casing (26) with cooling vents (64) enabling cooling fluid (F) to flow into and out of the casing when the rotor (10) of the electrical machine rotates. The rotor (10) may be formed from conductive elements (44) connected together at their outer regions by inter-connecting members (40) which have vanes (68, 70) arranged to direct cooling fluid over the outer regions. Each conductive element (44) is a metal strip (45) wi...

An electromechanical transducer, such as a motor (1), comprising a rotor member (4), a stator member (3) having an electrical winding (8), and isolating means (11, 9, 16, 12) isolating at least a part (18) of one of the members (3) from the other member (4), and cooling fluid in direct contact with said part (18) and isolated from the other member (4). The stator member (3) is preferably cooled by pumping liquid past it, whilst the rotor member (4) is isolated from the liquid. The rotor member (...

A binding machine is described for use in uncoiling the fingers of a binding comb (50), preparatory to an insertion of the fingers (54) of the comb into the apertures (48) provided in a packet or stack of sheets (46) to be bound together. The machine comprises a housing (6) supported for rectilinear reciprocal movement a drive plate (8), said drive plate being provided adjacent opposite side edges with a series of aperture (10), affording a rack, engageable by respective pinions (12) of the mach...

A two-phase switched reluctance motor comprises a rotor without windings, a stator having windings, and an electronic control circuit for controlling the current in the windings to effect rotation of the rotor. The control circuit includes a capacitance bridge defining a floating point to which one end of each of the windings is coupled to form a resonance circuit. Switching transistors are connected to the windings and are switched in synchronism with rotation of the rotor so as to produce curr...

Resistance welding machines may include one or more temperature sensors that measure the temperatures of one or more heat generating elements within the welding machine, such as the welding transformer, the welding cable, the welding gun and/or the welding current switching element. These heat generating elements generate heat due to the passage of the welding current and can be damaged if not properly cooled. A processor is provided to receive temperature signals from the temperature sensors(s)...