Abstract: Apparatus for registering a pair of rectangular sheets includes a rectangular sleeve whose width is variable, and a retractable gate located at one end of the sleeve. In a first embodiment, fluid injected into the other end of the sleeve provides first and second fluid streams which register one of the sheets with the gate and one of the narrow walls of the sleeve, and register the other of the sheets with the gate and the other narrow wall of the sleeve. In a second embodiment, the sheets are registered against a centrally disposed vented manifold and the gate. In a third embodiment, fluid drawn into the sleeve provides first and second fluid streams which register one of the sheets with the gate and one of the narrow walls, and register the other of the sheets with the gate and the other of the narrow walls.

Abstract: Apparatus for transporting and cooling toner bearing sheets discharged from a fuser includes a structure having a pair of superposed sheet passageways, the entrance to the passageways being located at one end of the structure. The structure is moved so that successive sheets from the fuser are alternately fed to the passageways and fluidic means move the sheets through the passageways and out of the structure, the directions in which a sheet travels in entering and leaving the structure being, generally, orthogonal.

Abstract: A magnetic brush development system for developing latent electrostatic images carried by a photoconductor has a stationary section containing at least one development roll and a movable section containing at least a sump for storing a supply of developer. The movable section is translatable forwardly and rearwardly toward and away from the stationary section and includes a flow gate for selectively interrupting the flow of developer from the sump. There is a catch mechanism for releasably latching the sections of the housing which is interlocked with the flow gate to insure that the flow gate is closed before the catch is disengaged, while still permitting the flow gate to be opened and closed at will while the catch is engaged.

Abstract: Wall framing members, specially fabricated with grooves in one face, have wallboard affixed to the framing member face by a specially fabricated compatible injector for forcing hot melt adhesive into the groove, while the wallboard is being held firmly against the framing member face.

Abstract: In the application of a plurality of layers of a settable joint compound over a reinforcing tape, in drywall construction, a thin coat of Al.sub.2 SO.sub.4 is sprayed over the tape and the board edges prior to applying the first layer and over the top of each layer immediately after the layer is applied.

Abstract: In a first embodiment, a stop having a plurality of ports is connected to and covers an end of a rectangular sleeve having a movable wide wall. In a region near the stop, a narrow wall of the sleeve also has a plurality of ports. A nozzle coupled to a pump provides a flow of air into the other end of the sleeve and the air exits through the ports. With this arrangement, a rectangular sheet inserted into said other end of the sleeve is fluidly brought into registration with the narrow wall and stop. After the sheet has been registered, the movable wide wall is moved towards the other wide wall of the sleeve. If a sheet is wrinkled, such movement flattens the sheet. In a second embodiment, similar to the first, the narrow wall and stop include internal projections against which an inserted sheet is registered. In a third embodiment, similar to the first, a manifold is coupled to the ports and a vacuum pump is coupled to the manifold to accelerate registration.

Abstract: A magnetic brush development system for developing latent electrostatic images carried by a photoconductively coated substrate has a split housing comprising a movable section with a sump for storing a supply of developer, a stationary section including one or more development rolls which are fed with developer from the sump to carry out the development process, a latching mechanism for releasably securing the movable section of the housing to the stationary section, and a flow gate which is interlocked with the latching mechanism so that the flow gate is closed to interrupt the flow of developer from the sump whenever the latch is released.

Abstract: A system for calibrating a receiver in a railroad grade crossing protection system having a transmitter and receiver connected to the rails and a defined approach track section, utilizes the receiver detected motion voltage to determine low ballast resistance. A signal representative of the ballast condition is then utilized in conjunction with the signal representative of train motion to calibrate the receiver for the particular ballast condition.

Abstract: A toner dispenser for a development system of an electrostatic processor has a removable reservoir which mates with a collar on a pivotally mounted hopper containing a dispensing roll. The reservoir may be slid into or out of the collar while upright, but after it is mounted the hopper is rotated to invert the reservoir so that there then is a gravitational flow of toner to the dispensing roll. Advantageously, the processor has two identically configured reservoirs, one for the toner dispenser as described above and the other for collecting the residual toner recovered at a cleaning station. In that event, the residual toner can be reclaimed simply by using the latter reservoir as a replacement for the former one.

Abstract: A toner dispenser for a development system of an electrostatic processor has a removable reservoir which mates with a collar on a pivotally mounted hopper containing a dispensing roll. The reservoir may be slid into or out of the collar while upright, but after it is mounted the hopper is rotated to invert the reservoir so that there then is a gravitational flow of toner to the dispensing roll.

Abstract: An active crossmixer comprising a pair of rotatably driven augers and a baffle for partially submerging the augers in developer is mounted in the development system of an electrostatic processor above the sump in a position to intercept the developer returning from the development zone and any additional toner added to maintain the toner concentration at a suitable high level. The developer is divided between the augers which, in turn, laterally transport the developer in opposite directions. Preferably, the baffle is apertured so that developer not only flows over the ends of the baffle but also through the baffle, thereby distributing the developer across the full width of the sump.

Abstract: An apparatus for detecting an approaching train within a track section utilizes a transmitter coupled to the rails at a feed point for applying a current to the track section. There is a receiver coupled to the track section for producing a signal representative of the impedance of the track section. There are devices for utilizing the received signal for detecting train motion, abnormally low impedance and abnormally high impedance of the track section. A normalizer circuit is connected to the receiver for increasing or decreasing the received signal gain within predetermined limits in accordance with variation in impedance of the track section.

Abstract: To provide simultaneous and efficient mixing and blending of the toner and carrier components of a multicomponent developer, there is a hybrid crossmixer comprising an auger-type active section and a pair of baffle-type passive sections. The crossmixer is used, for example, in a magnetic brush development system on the downstream side of the development zone. In that event, the partially denuded developer exiting from the development zone is split, with approximately half being routed to the active section and the other half being more or less equally divided between the two passive sections. Furthermore, the additional toner needed from time-to-time to maintain the toner concentration of the developer at a suitably high level enters the system via the active section of the crossmixer to ensure that it is rapidly blended in with the balance of the developer.

Abstract: A development system comprising a small compact modular developer unit which is retractably engagable with an image bearing surface is provided. The developer module contains within its casing developer feed and doctoring systems to provide a developer applicator surface containing appropriate quantities of developer. The system may use liquid and powder developers and is capable of high speed operation.