Abstract: In a hand stamp mount device especially suitable for a preinked stamp impression member that can give great numbers of imprints, the downstroke distance of a substantially rigid, non-rotatable assembly of a handle, a stem and a platen for carrying the impression member is adjustable precisely by turning with one's fingers an adjuster that correspondingly turns a stroke limiting stop member and causes it upon turning to be displaced proportionately lengthwise of the stem. Several ways of effecting the adjustments are disclosed, including some which eliminate all need for screw-threaded parts by making use of a molded ramp member presenting helical ramp surfaces. The platen and a case enclosing it are stiffened to resist stamping forces by an array of integral radiating ribs protruding upwardly from the platen and another array of such ribs protruding downward from the top of the case; and the ribs of the two sets intercalate to occupy vertical space in common when the platen is in normal upward position.

Abstract: A self-inking stamping device easily grasped and operated in a person's hand is provided by an improved arrangement of an encasing operating member relative to a frame member that supports an ink pad holder and contains an invertable type-carrying platen, with coacting means on the platen, the frame member and the operating member for disposing type of an elastic strip on the platen in inking position at an ink pad in the holder when the operating member is being held in a normal upward position by spring action and causing the type to impress evenly on a surface at the lower end of the frame member when the operating member is pressed downward to stamping position. Bridge members extending inward from an upper portion of an encasement wall of the operating member form a seat for a coiled spring compressed between them and an upper surface of the ink pad holder, and provide a space in-between them to receive and give access to an inking cup formation on the holder when the encasement wall is depressed.

Abstract: For the anaerobic purification of waste water it is difficult to maintain good operative contact between sludge particles with bacteria and water to be purified, i.e. sufficiently freely floating sludge particles, which means avoiding the formation of a dense settled layer of active sludge and avoiding easy washing away of sludge with the water in the usual upward flow thereof. The invention proposes the generation of a downward flow of the water to be purified in a reaction chamber and the introduction of an oxygen-free gas to contact the active sludge particles so that gas bubbles adhere thereto and keep them buoyant as much as possible notwithstanding said downward flow. Any sludge moving downwards with the water too much enters a flotation device near the top of the reaction chamber, from which it overflows to be returned wholly or partially to the reaction chamber.

Abstract: A system is provided for intermittently processing successive definite lengths of flexible sheet material in continuous web form, e.g., tractor-fed computer printout paper, with nearly tensionless transport of the web through web feeding operations, cyclical web processing and driving operations, and web delivery operations, that are not speed-interdependent. For each processing cycle, with the web extended without slack through an upstream lead to a processing station where a certain length of the web is positioned to be next processed, an excess length of loose web is fed into that lead, typically forming a loop in it; then the certain web length is processed and driven forward a distance shorter than the length of loose web; and then web is retracted from the upstream lead to remove the residual loose web and leave a next certain web length in position to be processed.

Abstract: Device and method for cleaning waste water, wherein the waste water (19) and oxygen gas (31) are flowing in opposite directions through a cylindrical multireactor (20) having a central rotatable pipe (24), the multireactor comprising a number of bioreactors and at least one separation chamber (75). The average pressure difference between two successive bioreactors is at most seven meter water column. The bioreactors are separated from each other by stationary walls (40, 41, 48, 55, 60), and each bioreactor has its own mixing device (50) for mixing waste water and oxygen gas.

Abstract: The mirror head of an outside rear view mirror is constituted by a mirror assembly mounted as a unit inside a housing having an upright front opening bounded by housing wall portions which converge in backward direction and, laterally, include a lower wall portion merging via an inner lower wall portion into an upwardly extending inner wall portion adapted to be positioned close to a window area of an automobile. The mirror assembly comprises a support bracket extending at an angle from a bracket foot portion mounted on the inner lower wall portion of the housing to a free end portion of the bracket which, through connections including a tensioned ball joint, holds a reflecting mirror plate securely yet adjustably positioned inside the housing opening.

Abstract: An exposure system for imagewise exposure of a movable light-sensitive layer, dot by dot along a line on the layer, to an electronically modulated light beam such as that of a laser has a narrow slit disposed near the light-sensitive layer in the path of the light beam, the slit being made with a width less than the dimension at the slit of the light beam in the direction of slit width. In this simple way, the laser beam always describes at least one and the same imaging line relative to the light-sensitive layer, even when beam run-out occurs.

Abstract: In a conveyor device for conveying sheet material in sheet or web form, two pairs of conveyor rollers are spaced apart with their axes parallel to one another, each pair including a deformable roller cooperating with a substantially non-deformable conveyor roller, and the two pairs of rollers are driven by a non-deformable drive roller which is mounted for rotation about a fixed axis disposed between them, with the deformable conveyor roller of each pair pressed against its cooperating non-deformable conveyor roller and also against the drive roller so that compensating differences of peripheral speed occur at the two pressure nips of each deformable conveyor roller. Each deformable roller is pressed in a direction located in or at least proximate to the plane of the bisector of the dihedral angle between a plane through the axes of the drive roller and the deformable roller and a plane through the axes of the deformable roller and its cooperating non-deformable conveyor roller.

Abstract: A dias light device to be placed on the original holder of a reproduction camera for effecting exposures with high enlargement of small originals comprises a housing provided with a window to receive a small original, such as a transparency, a light source in the housing, a light sensor for detecting light from a light source of a reproduction camera and a control system responsive to the sensor for activating the light source in the housing when the camera light source is active. The dias light device is applicable to any existing reproduction camera without any need to connect it with or alter the camera.

Abstract: In a contact fixing system in which a heat-softened toner image is fixed onto a sheet material by being pressed against the sheet material in a nip between the peripheral surfaces of two circulating fixing members, such as rollers pressing one against the other or a roller pressing against an image carrying belt, residues of the toner of an image and paper dust are removed from the surface of a fixing member in a cleaning zone beyond the fixing nip by moving in rolling contact with that surface a circulating cleaning surface, such as a roller surface, to which the toner adheres preferentially and which has a multiplicity of spaced-apart perforations formed therein and so disposed that with continued movements of the cleaning surface through the cleaning zone a toner layer formed on the cleaning surface is repeatedly pressed thin and excess toner present in it is displaced to the perforations for discharge through them into a cavity inside the cleaning member.

Abstract: The optical densities of both the background and the image areas of an original are measured so as to obtain a control signal useful in photocopying the original, by a system which includes a detector for generating a measuring signal representing optical densities detected on the original; a detector for deriving from the measuring signal a peak signal level representing the background density; first and second detection circuits for producing respective output signals representing numbers of measuring signal portions detected at first and second reference signal levels, which levels differ from each other and each from the peak signal level; a control rendering the reference signal levels dependent in magnitude on the derived peak or background signal level, and preferably proportional to it; and a comparison circuit for deriving from the output signals a control signal indicating in relation to the background density the relative amounts on the original of image information items that have optical densitie

Abstract: Optically active compounds of formula ##STR1## in which R is either a H.sub.3 C--, (CH.sub.3).sub.3 C--, (CH.sub.3).sub.3 CO--, C.sub.6 H.sub.5 CH.sub.2 O--, C.sub.6 H.sub.5 --, o-NO.sub.2 C.sub.6 H.sub.4 --, p-NO.sub.2 C.sub.6 H.sub.4 -- or a p-CH.sub.3 C.sub.6 H.sub.4 -group, or salts or lower alkyl esters thereof. The compounds are prepared by the following sequence of reaction steps:(a) there is started from a racemic mixture of a compound according to said formula in which R=a C.sub.6 H.sub.5 group,(b) cinchonidine, D(--)-2-aminobutanol-1 or a derivative thereof is added to this compound as resolving agent,(c) the D(--)-salt of the resolving agent formed is crystallized out and isolated,(d) if necessary, this salt is further purified of the L-isomer by recrystallization,(e) the pure D(--)-salt is hydrolysed in order to remove the resolving agent,(f) the D(--)-S-benzoyl-.beta.-mercaptoisobutyric acid thus liberated is won and, if necessary, purified, and(g) if desired, the C.sub.6 H.sub.

Abstract: Modular interlocking paving elements of uniform configuration are provided each in the form of a substantially right angular body bounded peripherally by two outer sides meeting at an outer angle apex, two inner sides meeting at an inner angle apex and two front sides each extending between respective ends of an inner side and an outer side, with dummy joint gaps formed in and extending across the top side of the body each from the inner angle apex to a midpoint of one of the outer sides. The inner sides, front sides, half sections of outer sides and dummy gaps are of substantially the same length, and each has longitudinal portions thereof projecting outside and/or recessed inside a straight base line between the ends thereof, so that the top side of each element appears to be composed of three four-sided elemental units disposed side by side and two or more of the elements will interlock laterally yet present the same surface appearance in any of a variety of side-by-side orientations.

Abstract: A reproduction camera for the production of contact screen prints from an original is provided with sensing means, such as a photoelectric cell, for obtaining a measure of the light reflected by the original under conditions of an imagewise main exposure through the contact screen and a signal representing the obtained measure is inputted to a computerized control system through which, by taking into account the effect of stray light caused by reflection from the original during the main exposure, a non-imagewise additional exposure through the contact screen is effected so as to reproduce the minimum and maximum optical densities of the original with the correct dot sizes.

Abstract: A rear view mirror head for vehicles, especially automotive vehicles such as small trucks, comprises a mirror head body constituted by a unitary, resilient dish-shaped molding of a tough, weather-resistant organic polymer composition, preferably an ABS resin, which presents about its front side peripheral formations for supporting a reflecting mirror plate with an edge gasket of the plate adhered thereto and comprises a backwardly hollowed narrow ear-shaped portion the hollow of which opens to the front side of the molding and has fitted into it rigid ear-reinforcing arms of angled brackets of which rigid base portions extend over and are fixed to areas of the front side adjacent to the hollowed portion of the molding. The resin of the molding can be of an electroplatable type having a stiffening decorative metal coating plated onto at least the outside surfaces.

Abstract: Sheets being advanced on a driven conveyor with one sheet at least partially overlapped by another are separated in the transport path, so that only one sheet is fed at a time, by the action of a friction member such as a roller which is mounted for swinging movement relative to a line of contact with the sheets for pressing the sheets against the conveyor and is biased by a spring and/or its own weight in the direction opposite to the transport direction. The axis of swinging movement is parallel to the line of contact and so located that a plane through the swing axis and the plane of the transport path at that line, as viewed in the transport direction, forms an angle of between about 70.degree. and 90.degree.. The friction member preferably is a roller which is rotated at a relatively low speed so as to move its peripheral surface in the direction opposite to the transport direction.

Abstract: A device for conveying a sheet along a conveying path while bringing and/or holding an edge of the sheet against an abutment strip at one side of the conveying path comprises a friction member that rotates about an axis extending transversely over the conveying path and has flexible fingers each extending in a direction that is the resultant of an axial component directed toward the abutment strip and a tangential component in the direction of rotation of the friction member. A rotating finger contacting a sheet in the path will bend in such a way that its end is displaced in the sheet conveying plane in the direction toward the abutment strip to position the sheet against that strip, and then will bend so as to move its end off the sheet.

Abstract: An apparatus for feeding sheets one by one from a group of at least partially overlapping sheets, in which a conveyor belt in contact with the lowermost sheet is driven to feed that sheet in the desired transport direction while a sheet separating roller forming a nip with the belt is driven so as to move the surface of the roller through the nip in the opposite direction, thus holding back of the nip sheets lying on the lowermost sheet, is provided with a displaceable member, for example a flat end portion of a leaf spring wound into a spiral, which has a smooth underside to receive under this member and press on the sheets approaching the nip and has a forward end edge slidably engaged with the surface of the roller immediately adjacent to the location where the sheets contact the roller. The displaceable member prevents the sheets from curling up or buckling in the vicinity of the roller, irrespective of the number of sheets and irrespective of variations of the position of the separating roller.