Abstract: An apparatus which prevents lateral movement of a belt moving in a pre-determined path. The apparatus includes a readily deformable surface which moves the belt in the pre-determined path and a support for preventing lateral movement. Strains induced in the belt by preventing the lateral movement thereof distort the deformable surface which, in turn, cause the belt to return to the pre-determined path.

Abstract: An apparatus in which at least two sheets are stapled to one another. The apparatus includes a controller which places a pressure source in communication with a staple drive so that pressurized fluid actuates the staple drive to drive a staple through the sheets. Thereafter, the controller places the staple drive in communication with a staple clincher so that the pressurized fluid exhausting from the staple drive actuates the staple clincher to clinch the portion of the staple legs protruding through the sheets.

Abstract: An electrophotographic printing machine in which a single processing station performs the functions of charging a photoconductive member and developing an image recorded thereon. In addition, this processing station may perform the additional function of transferring the powder image from the photoconductive member to the copy sheet.

Abstract: An apparatus in which the lateral alignment of a belt arranged to move in a pre-determined path is controlled. A support mounted resiliently constrains lateral movement of the belt causing the belt to apply a moment to a pivotably mounted steering post. As a result of this moment, the steering post pivots in a direction to restore the belt to the pre-determined path.

Abstract: An apparatus in which particles are advanced from a storage container through a tube having a plurality of apertures therein. The particles are moved along the tube by paddles secured to a shaft so as to be discharged through the apertures in the tube. The shaft is mounted reciprocably and rotatably within the tube. In this manner, the paddles engage the particles during its forward movement while being spaced therefrom during the return to its initial position.

Abstract: An apparatus in which toner particles are discharged into a developer material. A helical auger moves the toner particles through a tube having substantially equally spaced apertures therein. The toner particles are dispensed from the tube with the nondispensed toner particles being returned to the toner particle supply hopper.

Abstract: A development apparatus in which particles stored in a chamber of a housing are deposited on a latent image. Air flow is controlled to prevent leakage of the particles from the chamber of the housing.

Abstract: A stapler including a driver, a magazine for sticks of staples, and a staple feeder for feeding staple sticks from the magazine to the driver and biasing the stick into position for stapling, said feeder comprising an endless belt arranged frictionally to engage the crown of a said stick and means for driving the belt.

Abstract: There is described an electrophotographic toner comprising a resin material and as an additive a sterically hindered phenol, that is a phenol that has its atoms arranged in a particular manner in a molecule and does not undergo an expected chemical reaction due to inhibition by particular atomic groupings. These phenols are effective as thermal stabilizers for toner resins in that they reduce the rate of thermal decomposition and/or act as plasticizers in that they lower the toner melt viscosities and fusing temperatures.

Abstract: Disclosed are monomers of the formula: ##STR1## WHEREIN R is ##STR2## R' is hydrogen or methyl; R" is alkyl of 1-10 carbon atoms;X and Y are independently selected from the group consisting of NO.sub.2, halogen, cyano and --CF.sub.3 ;Z is oxygen or dicyanomethylene;a and a' can range from 0-3; andn is 1-10.These monomers can be readily polymerized to polymers suitable for use in electrophotographic imaging members and methods.

Abstract: A photosensitive member having at least two electrically operative layers is disclosed. The first layer comprises a photoconductive layer which is capable of photogenerating holes and injecting photogenerated holes into a contiguous charge transport layer. The charge transport layer comprises an electrically inactive organic resinous material containing from about 10 to about 75 percent by weight of: ##STR1## where R.sub.1 is selected from the group consisting of an alkyl with from 1 to 12 carbon atoms and an alkyl with from 1 to 12 carbon atoms substituted by aryl groups selected from the group consisting of phenyl, maphthyl, anthryl, and biphenyl and R.sub.2 is selected from the group consisting of methyl, ethyl, chloro, bromo and hydrogen.

Abstract: An apparatus in which particles are mixed. The particles are disposed in an inner member having an outer member spaced therefrom and positioned concentrically thereover. A helical magnetic pole pattern is impressed on the outer member. Relative angular rotation between the outer member and the inner member translates the particles generating mixing therebetween.

Abstract: A development apparatus in which the donor member has a pattern of depressed regions therein. The donor member moves developer material into contact with a sheet of support material disposed adjacent an electrostatic latent image recorded on a photoconductive surface. Inasmuch as the donor member has a pattern of depressed regions therein, the developer material is deposited on the sheet of support material in a half-tone pattern.

Abstract: An apparatus in which a plurality of developing rollers deposit particles on a latent image. The developing rollers are activated and de-activated sequentially in response to the leading edge and trailing edge, respectively, of a latent image being closely adjacent to the rollers. The developer particles are transported from a storage chamber by at least one transport roller to at least one pair of feed rollers prior to its transfer to the developer rollers. A device for controlling the amount of developer particles transported by the transport roller to the feed rollers is positioned closely adjacent to the feed rollers.

Abstract: An apparatus in which an original document is reproduced. The original document is scanned to determine the tonal graduations thereof and a signal generated indicative thereof. An image of the original document having a plurality of half-tone dot spacial frequencies is formed. Each half-tone dot spacial frequency is selected from a plurality of selected spacial frequencies corresponding to a pre-determined signal range. In this manner, the selected half-tone dot spacial frequencies are a function of the signal indicating the tone graduations of the original document.BACKGROUND OF THE INVENTIONThis invention relates generally to an electrophotographic printing machine, and more particularly concerns a printing machine arranged to reproduce an original document as a copy having the half-tone dot frequency thereof dependent upon the tonal graduations of the original document.In a typical electrophotographic printing machine, a photoconductive member is charged to a substantially uniform level.

Abstract: Charged residual toner is removed from a photoreceptor by simultaneously (1) exposing the photoconductive layer of the photoreceptor to light, (2) charging the photoconductive layer to the same polarity as that of the toner, (3) vibrating the photoreceptor to dislodge the toner by entraining the photoreceptor about a roller while rotating the roller about an eccentric axis, and (4) subjecting the toner to a force (e.g. vacuum or gravity) which draws the toner away from the photoreceptor.

Abstract: An electronically controlled magnetic recorder for rapidly optically scanning an original document and for producing a latent magnetic image thereof. The recorder comprises directly coupled helical optical scanning and helical magnetic writing.

Abstract: An apparatus in which a stripping member separates a sheet adhering to a moving member. The stripping member is translatable so as to maintain the spacing between the moving member and the surface of the stripping member opposed therefrom substantially constant.

Abstract: An apparatus in which a sheet is separated from a moving member. The apparatus includes a pair of elastomeric diaphragms coupled to a stripping member. A detector senses the spacing between the moving member and the stripping element of the stripping member. The diaphragms, in response to the sensed spacing, pivot the stripping member so as to maintain the space between the moving member and stripping element substantially constant.

Abstract: An apparatus in which a latent image arranged to be recorded on a surface is rendered visible with particles. The drive system associated with moving the particles into contact with the latent image has at least a portion thereof mounted internally of the particle supporting member.