Abstract: A motion detector comprising a rotator member having at least one radially positioned member and being mounted for rotation from at least a first position to at least a second position; a detector member, preferably a Hall Effect sensor; and a magnet producing a magnetic field; wherein, the radially positioned member is characterized by altering the magnetic flux of the magnetic field when it moves into and out of proximity to the magnet; and wherein the detector member detects the alteration of the magnetic flux. The motion detector is preferably used to detect the speed, type, position, presence, and absence of a printer ribbon cartridge.

Abstract: A motion detector comprising a rotator member having at least one radially positioned member and being mounted for rotation from at least a first position to at least a second position; a detector member, preferably a Hall Effect sensor; and a magnet producing a magnetic field; wherein, the radially positioned member is characterized by altering the magnetic flux of the magnetic field when it moves into and out of proximity to the magnet; and wherein the detector member detects the alteration of the magnetic flux. The motion detector is preferably used to detect the speed, type, position, presence, and absence of a printer ribbon cartridge.

Abstract: The ribbon cartridge includes a re-inker assembly having a pair of idler rollers defining a nip therebetween through which the print ribbon is advanced. The idler rollers have teeth intermeshing one with the other and with the print ribbon therebetween such that the idler rollers are positively driven when the ribbon is advanced. One of the idler rollers lies in contact with a re-inker roller or wick for transferring ink from the re-inker roller or wick to the print ribbon as the ribbon passes through the nip of the idler rollers.

Abstract: An HF alkylation unit with improved safety features including an acid storage and evacuation receiver which maintains a large proportion of the acid inventory of the unit at a remote, safe location. The unit also has an acid evacuation system which is capable of transferring the acid from the reactor section of the unit to the receiver within a very short period of time in the event of an uncontrolled release from the unit. The acid receiving drum is connected to the remainder of the unit by means of acid transfer lines for rapidly evacuating the acid and is desirably maintained at a pressure lower than the reactor section of the unit to enable the acid to be pressured into the receiver. The pressure in the receiver is suitably maintained by a pressure balancing line to the fractionation system at a lower pressure than the alkylation reaction itself. Unit acid inventory may be reduced by the use of an acid settler provided with an acid boot and coalescing baffles which promote a phase separation.

Abstract: A printer has one or more tractor sets for continuously feeding paper along first and second paper paths. One tractor set may be pivoted between positions for feeding paper from the front or bottom of the printer along the first paper path. Where one tractor set is used, it may be removed from the first feed path and disposed along the second paper path to feed paper along the second paper path for printing. Where two tractor sets are provided, the second set is disposed along the second paper path to feed the paper along the second path for printing. The tractor sets are detachable and usable in each of the three tractor set feed positions. Other features include eccentric bearings, resilient roller assemblies, an integrally molded mainframe and a cartridge assembly having a one-way ribbon advance clutch and a tensioning device before the mobius loop.

Abstract: The present invention comprises a fixed bed reactor, a method of loading catalyst into the reactor to minimize plugging and to improve the uniformity of fluid flow across the reactor, and a hydrotreating process employing the novel reactor. The system utilizes removable partition forms and/or permanent interbed baskets to create gradual transition zones between catalyst layers and to significantly increase the open area available for flow at the interface of such zones.

Abstract: A catalytic converter for use in a gaseous stream comprises cylindrical segments of monolithic ceramic impregnated with catalytically active materials, such as hydrocarbon and carbon monoxide conversion catalysts, axially spaced apart by greater than 1/4 inch within a cylindrical metal container, said container having a gas inlet upstream from said spaced apart segments and a gas outlet downstream therefrom and a plurality of spaced apart protruding fins attached to the outer circumference thereof.

Abstract: Catalyst and hydrocarbon vapors are separated in a cyclone attached to the discharge of a riser cracking operation. The cyclone is modified to include a separate cyclonic stripping of catalyst separated from hydrocarbon vapors.

Abstract: A regenerator design and method are provided which rely upon a segmented regeneration gas distributor grid to vary regeneration gas flow upwardly through the bed of catalyst above. The design includes an expanding annular section formed by a curved vertically extending baffle positioned adjacent and downstream of the catalyst tangential inlet and a radical dilute phase baffle extending from slightly beneath the bed surface to above the cyclone inlets. The width of the dilute phase baffle is from the wall of the regenerator to the center thereof, and beyond the rim of the catalyst outlet. Further, all cyclone diplegs between the outlet and inlet should be positioned to discharge tangentially to the swirl.

Abstract: A fluid catalytic cracking - catalyst regeneration system is described wherein regeneration of a crystalline zeolite hydrocarbon conversion catalyst is accomplished at an elevated temperature in the presence of regenerated catalyst mixed therewith in the upper portion of a bed of regenerated catalyst with the mix ratio controlled as a function of the amount of primary regeneration gas introduced to a lower portion of the bed of regenerated catalyst.