Abstract: A differential control system for restrictively controlling a differential, which has electromagnetically controlled clutches disposed between differentially driven shafts, is electromagnetically controlled to lock and unlock the driven shafts. The control system has a controller for restrictively applying a locking current to the differential to lock and unlock the clutches in accordance with control modes manually selected.

Abstract: The invention provides an improved dry etching method for selectively etching a silicon nitride layer 3 formed on the surface of a SiO.sub.2 layer 2 formed on a p-type semiconductor substrate, the method comprising the steps of supplying a mixed gas of HBr and ClF.sub.3 to a reaction chamber wherein SiBr.sub.4, caused, during the dry etching, by a reaction of the silicon nitride layer 3 and the HBr contained in the mixed gas, partly deposits on an etching wall of the p-type semiconductor substrate 1 while at the same time an excess of the SiBr.sub.4 reacts, between the p-type semiconductor substrate 1 and a wall of the reaction chamber, with the ClF.sub.3 contained in the mixed gas to produce a fluoride. The fluoride thus produced can be easily discharged to the outside, since it is more volatile.

Abstract: A rotor assembly for a screw pump has a light alloy rotor main body having an axially extending central bore. A steel shaft is press-fitted into the central bore. A diametrically extending fixing pin is press-fitted through the rotor main body and the shaft. Friction forces between the rotor main body and the shaft are arranged to be larger on a discharge side of the rotor assembly than on a suction side thereof. The fixing pin is disposed at substantially a central position of entire friction forces in terms of their directions and magnitudes.

Abstract: A printer of the automatically interchangeable character wheel type includes a platen formed lengthwise of the printer to support one surface of a printing sheet, and a carriage guided so as to be reciprocally movable along the platen. The carriage carries thereon contain a housing for containing a character wheel therein, a first shift device for shifting the character wheel in the containing housing to a printing position, a printing hammer for impacting the characters of the character wheel in the printing position, and a second shift device for shifting an ink ribbon to a first position for printing and a second position for standby by the same motor that drives the first shaft device.

Abstract: In manufacturing a film capacitor, an etching of laminated or stacked film capacitor body for making electrode connection is made by a two-stage application of radio frequency power, wherein a first stage application is at a larger power and a second stage application is at a smaller power of the radio frequency.

Abstract: A film capacitor which has a plurality of electrodes; at least one layer of dielectric member made of organic material and interposed between each pair of neighboring electrodes; impreganated members made of organic material and disposed in a gap between the electrode and the dielectric layer or between the dielectric layers; and end electrodes applied respectively to opposite electrode drawout end faces and connected alternately with the electrodes. The dielectric layers and the impregnated members alternate with each other and have respective end faces. The end portions of the dielectric layers and impregnated members are indented to provide respective indented end face.

Abstract: A scroll compressor comprises a compression mechanism comprising a combination of a fixed scroll and an orbiting scroll; a main shaft for driving the orbiting scroll; an electric motor rotor and stator for driving the shaft; a first bearing frame for supporting the orbiting scroll in the axial direction through a bearing; a second bearing frame for supporting the shaft in the radial direction through a bearing; a hermetic shell including the compression mechanism in an upper portion, the rotor and stator in a lower portion, and an suction pipe for inspiring a working fluid; and a dividing chamber arranged in the shell so as to communicate with the suction pipe and having efflux holes for directing the inspired working fluid to the compression mechanism in the upper portion, the stator and rotor in the lower portion, and an upper coil end of the stator placed in a position lateral to the chamber.

Abstract: A film capacitor having metallic layer electrodes, organic dielectric films interposed between the metallic layer electrodes, and a pair of end surface electrodes disposed at the opposite ends of the capacitor and alternately connected to the metallic layer electrodes. The end surfaces of the dielectric films adjacent to each other and located at the opposite end surfaces of the capacitor are formed with irregularities.

Abstract: A scroll type compressor, wherein the oil feeding passage of the thrust bearing to be interposed between the orbiting scroll member and the bearing support is so constructed as to having its terminal part within a plane of the thrust bearing, and a part of each of the passages is made to open at a position where it is intermittently communicating with the guide grooves of the orbiting scroll member.

Abstract: A scroll compressor comprising a driving scroll and a driven scroll which is combined with the driving scroll and is driven by the driving scroll through an Oldham's coupling, a partition plate fixed to a container for housing the structural elements such as scrolls and having a supporting pin provided at a position near the inner wall of the container, a movable bearing support which is placed below the partition plate and is engaged with the supporting pin so as to be swingable around the supporting pin, and which supports the driven scroll through a bearing, and a rotation controlling structure which causes a swinging movement of the movable bearing support around the supporting pin along with a driven scroll whereby the distance between the axial centers of said driving and driven scrolls is changed.

Abstract: A scroll-type compressor is disclosed which has a novel thrust bearing for supporting an orbiting scroll. The thrust bearing is annular and is supported by a bearing support frame which has a plurality of oil return holes formed therein. The diameter of the thrust bearing is smaller than the diameter of the orbiting scroll and of an Oldham coupling which guides the orbiting scroll. The thrust bearing has a plurality of oil passageways for lubricating oil formed therein whose inner ends open onto the central hole and whose outer ends communicate with the oil return holes and do not extend to the outer periphery of the bearing. The oil passageways are always covered by the orbiting scroll. In one form of the invention, the oil passageways are in the form of grooves formed in the upper surface of the bearing and through holes which communicate between the outer ends of the grooves and the oil return holes. In another form of the invention, the oil passageways are slits formed through the depth of the bearing.

Abstract: A scroll compressor is provided with a main shaft to drive an orbiting scroll whereby fluid in a compression chamber which is formed by combining a stationary scroll with the orbiting scroll is compressed and then is discharged from the scroll compressor. To prevent a refrigerant gas in an eccetric recess formed in the main shaft from mixing with a lubricating oil, a conduit is formed in the main shaft to communicate the eccentric recess with a space between the lower part of the orbiting scroll and the upper part of the main shaft.

Abstract: In a scroll type compressor, the shaft of a driven scroll is rotatably supported in a sealing container so that the axis of rotation of the driven scroll shaft is deviated from the axis of rotation of a driving scroll; the wrap plates of the driving and driven scrolls are mutually combined with each other so that the parts of the side surface of the wrap plates come in contact with each other to form a compression chamber; and the driven scroll is directly driven by the driving scroll in synchronism therewith, whereby the function of compression of a fluid is obtainable during the movement of the compression chamber toward the centers of the driving and driven scrolls.

Abstract: A scroll compressor comprises an orbiting scroll and a stationary scroll, both being mutually combined to form a compression chamber therebetween. The scroll compressor is provided with a lubricating oil feeding system to lubricate each bearing constituting a contact-sliding and contact-rotating part. A special arrangement of oil grooves is made in a thrust bearing supporting the orbiting scroll in such a manner that pressure loss in the oil grooves of the thrust bearing is greater than a pressure raised by the third oil pump means so that there causes no negative pressure at the inlet port of a radial oil feeding conduit and the outlet of the vertical oil feeding passage in the main shaft.

Abstract: A scroll compressor comprises a driving scroll and a driven scroll which is combined with the driving scroll and is driven by the driving scroll through an Oldham's coupling, a partition plate fixed to a container for housing the structural elements such as scrolls and having a supporting pin provided at a position near the inner wall of the container, a movable bearing support which is placed below the partition plate and is engaged with the supporting pin so as to be swingable around the supporting pin, and which supports the driven scroll through a bearing, and a rotation controlling means which causes a swinging movement of the moveable bearing support around the supporting pin along with the driven scroll whereby the distance between the axial centers of said driving and driven scrolls is changed.

Abstract: A scroll-type apparatus having a main journal bearing which journals the drive shaft of the apparatus and is capable of pivoting by small angles with two degrees of freedom. The main journal bearing comprises three or more arcuate pads whose inner surfaces journal the drive shaft and which are pivotably supported by a stationary main bearing housing. In a preferred embodiment, each of the pads has a spherical protrusion and two rotation-preventing pins secured to its back surface. The protrusions contact the inner surface of the main bearing housing and pivotably support the pads, while the rotation-preventing pins are inserted into grooves formed on the inner surface of the main bearing housing.

Abstract: A scroll-type apparatus having an improved radial seal and a method for the assembly thereof is disclosed. The spiral wrap of a moving scroll and a stationary scroll are provided with gap adjusting means for providing a gap of a desired size between the top surface of the spiral wrap of each scroll and the top surface of the base plate of the opposing scroll. The gap adjustment means comprises a spiral-shaped elastic element which fits into a groove formed in the top surface of a spiral wrap or on top of a protrusion formed on the top surface of the spiral wrap, to form a nonpressurized seal. The elastic element is supported by the spiral wrap by friction, bonding, or solvent welding.

Abstract: A scroll-type fluid transferring machine comprises a stationary scroll member and an oscillatable scroll member, each of which has a spiral wrap of an involute curve or other curves projecting from a base plate and which cooperate to form a compression chamber between the spiral wraps and the base plates by mutually fitting one into the other, an oscillatable scroll shaft provided on the surface of the base plate at the position opposite the spiral wrap of the oscillatable scroll member, a crank shaft having an eccentric recess having its axis which is shifted by a predetermined distance from the axis of the crank shaft, wherein a cylindrical bush having the coaxial outer and inner circles is loosely fitted in the eccentric recess of the crank shaft with a gap between the outer circumference of the bush and the inner wall of said eccentric recess, and the shaft of the oscillatable scroll member is fitted in the inner circumference of the bush in a freely rotatable manner.

Abstract: A scroll-type compressor including stationary and orbiting scrolls housed in a shell. A first frame, also housed in the shell, receives a portion of the orbiting scroll. The stationary scroll is fixed to the first frame, and a second frame is further mounted in the shell. A balancer chamber is formed between the first and second frames. A main shaft having a balancer is housed in the balancer chamber rotatably. The main shaft includes an enlarged diameter portion on one end of the shaft which is attached to the orbiting scroll and a small diameter portion at the opposite end of the shaft, said shaft extending between the first frame and the second frame for driving the orbiting scroll. A first bearing is disposed between the main shaft and the first frame for supporting the main shaft at a position at the orbiting scroll end of the shaft. A second bearing is disposed between the main shaft and the second frame for supporting the main shaft at a position proximate the opposite end of the shaft.

Abstract: A scroll-type compressor including stationary and orbiting scrolls housed in a shell. A first frame, also housed in the shell, receives a portion of the orbiting scroll. The stationary scroll is fixed to the first frame, and a second frame is further mounted in the shell. A balancer chamber is formed between the first and second frames. A main shaft having a balancer is housed in the balancer chamber rotatably. The main shaft includes an enlarged diameter portion on one end of the shaft which is attached to the orbiting scroll and a small diameter portion on the end of the shaft which is attached to the orbiting scroll and extending between the first frame and the second frame for driving the orbiting scroll. A first bearing is disposed between the main shaft in the first frame for supporting the main shaft at a position between the orbiting scroll end of the shaft.