Abstract: A screening machine of the type used to separate or classify mixtures of solid particles of different sizes includes a fixed base and a perforate screen mounted for movement relative to the base during a screening operation. The screens are pre-tensioned and mounted in a perimeter frame for separating various granular and particulate material. The frame is slid into the side of the machine in a direction parallel with two opposing bevel lips at the ends of the frame which mate in the screening machine with a complementary channel such that when the screen is raised into sealing contact in the screening machine, the bevel ends of the screen panel frame align the screen panel in the machine. The bevels on the screen panel frame provide a positive sealing surface for contact with the adjacent portions of the channel to prevent product from escaping off of the screen during use.

Abstract: A screening system with knocking devices includes a screen panel support, connector bars, knocking devices, and screen panels. The knocking devices are generally spherical-shaped balls held by elastic arms connected to the connector bars. When the screening system is activated by moving material onto the screen panels and vibrating the screen panel support, the knocking devices bounce around the undersurface of the screen panels and prevent the build-up or jamming of material blocking the openings in the screen panels. The knocking device and screen panels are separate so that when one of those elements becomes defective, the screening system can be fixed without replacing both elements.

Abstract: The invention relates to a sieving device provided with a sieving mat (2), which has sieving openings, and with beating elements (7), which are located underneath the sieving mat and which strike against the underside of the sieving mat (2) in order to free the sieving mat (2) from material to be sieved that is clogging the sieving openings. Said beating elements (7) are fastened to at least one elongated tensioned traction mechanism (5) such as a cable or band that extends underneath the sieving mat (2).

Abstract: A spreading roll for spreading out a chip fleece for producing wood chip material or similar panels, includes two disk-shaped end pieces (3, 7), plural thin spokes (6), rods, pipes or cords arranged extending between the end pieces, and pipe-shaped loose sheaths (9, 10, 11, 12, 13) arranged on the spokes or the like for preventing the adhesion of fibrous materials or contaminants on the spokes or the like.

Abstract: A mobile separator for separating irregular particles of varying sizes using a separator belt conveyor having a plurality of horizontally disposed endless belts in spaced parallel relationship, a rotary vibrator bar located beneath the top runs of the endless belts is rotated in the same direction as the belts and sets up vibrations which agitate the particles as they are conveyed to enhance separation. The top runs of the belts are guided for parallel travel and the bottom runs are guided such that adjacent belts are positioned in superimposed relation for increased spacing to permit free passage of material therethrough. The rotary vibrator bar may be driven by the same power source as the separator belts with speed control means to drive the belts and the vibrator bar at different speeds.

Abstract: A sieve insert for a cylinder sieve machine, and especially for a tumbling sieve machine. A sieve insert is provided with the features of a level sieve onto which the material to be sieved is charged, a rebound bottom substantially parallel and arranged at an interval to the sieve and carries a plurality of rebound bodies, a sieve frame for carrying the sieve, and a carrier frame carrying the rebound bottom and the sieve frame. The sieve insert is subdivided into a series of sieve segments, in which sieve frame supports the sieve segments along their contours.

Abstract: A device and method for sorting of pellets so that pellets containing defects are detected and sorted out. The device includes a light detector arranged over a transparent pellet transport track. A light source is arranged on the opposite side of the track. The detector provides a measurement of a received light intensity, and if the measured intensity is lower than a predetermined threshold value, it can be assumed that a defect is present. The pellet containing the defect is then sorted out by actuating a sorting device. In order to obtain a high precision detection, light is distributed evenly from all directions, including ambient light. The light source fine tunes the balance of the light source and incoming light from other directions. A highly reflective chamber and/or tilted optical axis further provide the desired even distribution of light.

Abstract: A variable frequency screening device consisting of a pair of spaced elongated side members, a flexible screen surface supported between the side members, a frame member supported between the side members and beneath a flexible screen surface, at least one striking frame shaft rotatably mounted between the elongated side members and beneath the flexible screening material, a striking frame mounted to the striking frame shaft, a second striking frame mounted to the striking frame shaft, and a motor to rotate the striking frame shaft which, in turn, causes the first and second striking frames to alternately strike the underside of the flexible screen material. The apparatus is equipped to permit the striking frames located on additional striking frame shafts to strike the screening material at independently selected amplitudes and frequencies.

Abstract: A sieve box for a particulate sifter has a pan, a screen, and a number of screen and pan clearing devices. Each device has a first member with fingers engageable with the pan to remove particulates that accumulate on the pan and a second member with fingers adapted to engage the screen to clean the screen or particulates. The first and second members have cooperating structures that movably connect the structures to allow free combined lateral movement in the sieve box and independent relative rotational, vertical and wobble movements.

Abstract: The sieve efficiency can be increased in an improved sieve apparatus in such a way tat the sieve apparatus is equipped with a compulsory mixing device (5). By means of this, during the sieve process, the sieve product, which is moving forward along the main flow direction (1) to a delivery end (11), is thoroughly mixed, which produces the desired increase in sieve efficiency.

Abstract: An endless conveyor grader (1) suitable for use in grading tubers (4) or the like. The endless conveyor comprises an endless grid screen (21) supported by an endless drive transmission (37) at opposite sides (23, 25) of the endless grid screen (21). An endless drive transmission guide (36, 39) is provided at opposite sides (23, 25) of the endless grid screen formed and arranged so as to define at least one cascade (40) or step (40) in the endless grid screen pathway. The cascade(s) or step(s) (40) allow for tumbling, in use of the grader of tuners (4) passing over the cascade(s) (40) or step(s) so as to provide the required movement of the tubers (4) on the grid screen (21) to facilitate the grading process. The grid screen comprises parallel support bars provided with a multiplicity of `I`-shaped link members (46) bridging between the support bars (47) so as to allow the grid screen to change direction in the endless grid screen pathway.

Abstract: A sieve screen deck comprising having a frame and a sieve screen resiliently mounted to the frame so as to allow a limited amount of movement between the sieve screen and the frame. The sieve screen has flexible side walls. The screen deck also has a rapping mechanism which itself has a ram fixed at one end relative to the frame and acting at its other end on a drive shaft via a crank arm. The drive shaft extends across the sieve screen and is rotatably journalled in the respective side walls of the sieve screen. The rapping mechanism also has a rapping bar connected to the drive shaft by resilient elongate arms. The rams is actuated so as to move the rapping bar at intervals from a rest position wherein the rapping bar is spaced a short distance from the sieve screen and the sieve screen is supported by the frame to a primed position.

Abstract: A large or square plansifter has a large number of sieve stacks with e.g. more than 20 sieve boxes. Such boxes are constructed without a supporting grating and design so as to be exchangeable in the covered state and so that they can be placed on or in the sieve frames. A free product fall-through space or discharge space is accordingly formed between the sieve screen and a flat base plate. The sieve cleaners are placed on or in the flat base plate. In a particularly preferred manner, the sieve frames are constructed as metal frames. The sieve cleaners clean the sieve screen and clear the product from the base plate. The sieve cleaners preferably have 2, 3 or 4 arms.

Abstract: A powered screening apparatus having a pair of spaced elongated side members, a screen surface supported between the side members, a frame member supported between the side members and beneath the screen surface, a first hammer mounted to the side members beneath the screen surface, a second hammer mounted to the frame member, a first vibrator attached to one of the side members and the second hammer and a second vibrator attached to the other side member and the second hammer. The apparatus is equipped to permit the side members to vibrate independently of each other.

Abstract: A vibrating screen apparatus having a pair of side members, a screen surface supported between the side members, a pair of frame members supported between the side members and beneath the screen, a first hammer to vibrate the screen, a second hammer that alternately vibrates the screen with the first hammer and a motor to impart motion to the hammers and frame members. The screen apparatus is provided with a method to selectively tension the screen surface. The apparatus is equipped to permit varying the frequency and amplitude of the hammers and screen material. The apparatus is equipped with only a single motor on each screen section to provide economy in use.

Abstract: The device according to the invention comprises a vibrating frame (10) to which a vibrating housing (11) is attached, supporting a vibrating screen (12). Below this screen are attached a certain number of fixed bars (14), as well as a certain number of movable bars (15), each held at the extremity of two arms (16) attached by a flexible connection (17). The vibrating housing 11 is driven by a first electric motor (20) used during the normal screening process and a second electric motor (23) which rotates at a lower speed than that of the other motor (20) for unblocking the device by maintaining the movable bars in resonance so that they strike the lower surface of the vibrating screen (12). This device is particularly advantageous because it is adaptable to all vibrating machines.

Abstract: Disclosed is a vibratory sieve for separation of fibrous materials from materials containing them, the vibratory sieve comprising a sieve body and a mechanism for imparting vibration to the sieve, the sieve body including a screen to be vibrated by the mechanism, the sieve being adapted to convey a mixture of water and the materials containing the fibrous materials onto the screen through meshes of which finer particles and water are passed by the vibration of the screen, leaving the fibrous materials on the screen, the sieve being characterized in that the sieve is provided with an annular member which is movable on the screen surface by the vibration of the screen and whose movement is confined by an inlet member in such a way that the mixture of water and the materials containing the fibrous materials is placed inside the annular member.

Abstract: A screening system incorporated into the system of sawdust collection for paper producing pulp. An upper and lower range of the sawdust particles is designated as between smaller, strength-inhibiting size particles and larger strength-enhancing size particles. A screen is provided to screen out the smaller size particles. The screen is made out of stainless steel to avoid rusting and corroding and also to more readily pass the moistened smaller size particles. The screen is sloped and agitated to induce shuffling of the sawdust mixture, the process of which results in a separation of about 50% of the particles as rejected smaller size particles and 50% as acceptable larger size particles desirable for paper producing pulp.

Abstract: A vertical set of sieves receives the particulate material from a vibrating trough conveyor above the set and is vibrated by an agitator on the machine frame. The sieves are spread apart and then tilted to dump the collected particles into respective funnels. The set can then be swung back and contracted for the the next stage. The funnels are connected to collectors which are automatically weighted.

Abstract: Apparatus for removing debris from granular material includes a set of scalper assemblies and striker assemblies, which are disposed between an inlet and an outlet, and which are interconnected by a mechanical system to help urge the flow of the material through the housing to the outlet. The scalper assemblies are disposed on a set of frames covered with removable screens so that the flow of material falling against the scalper screens, cascades down the screens to form a flowing sheet of material, which falls off of the terminal end of the frame. The scalper screens are tiered and portions thereof are raised and dropped to help urge the larger debris within the granular material downwardly across the scalper screen towards its terminal end, while concurrently permitting the smaller granular material disposed thereon to fall through the screen meshings.

Abstract: A wood particle screen particularly useful for separating fines from wood chips in which a bed of flexible foraminous material having holes therein sized to permit fines to pass therethrough is flexibly mounted for receiving a flow of wood chips and fines thereon. Beater rolls are disposed beneath the screening bed, each including a plurality of spaced beater bars so positioned as to contact the bottom of the screening bed as the bars rotate through the uppermost position of the rolls.

Abstract: A vibratory screening machine comprises a frame, at least two screens with meshes of different size arranged in the frame one above the other, pushers hinged to a support in the interscreen space, and vibrating drives for imparting vibrational movements to the pushers. Each pusher is formed by two levers hinged each, at one end to the support, the other end of each lever making contact with one of said screens, and an elastic element being disposed between the levers.

Abstract: A screening machine with two driven systems driven in circular oscillation by means of at least one eccentric shaft. The shaft is mounted on both frames simultaneously which are separated from one another and each of the frames comprises a plurality of crossmembers fastened parallel to one another to the respective pair of uprights. The crossmembers of the respective frames, lying in a respective screening plane, alternate with one another and are driven by the systems in a way resulting in a stretching and contracting motion of an elastic screen fastened to the crossmembers and, consequently, the screen material is cast from the surface of the screen.

Abstract: A vibratory screening apparatus for dry, very fine material. A vibratory housing is employed with parallel screening elements disposed across the housing and spaced vertically. The lower screening element has a much finer mesh size than the upper screening element. The housing includes an opening laterally from between the two screening elements for discharge of material not passing through the lower screen. Sliders are positioned between the screens which have a flat lower surface for riding directly on the lower screen and extend a major portion of the distance between the upper and lower screens.

Abstract: A power sieve has a generally planar and longitudinally extending frame having upstream and downstream ends and a pair of laterally spaced side members extending longitudinally between the ends, a generally planar screen spanned longitudinally within the frame, and a plurality of longitudinally spaced and substantially parallel beater beams underneath the screen and having beam ends juxtaposed with the frame side members. Respective horizontally extending leaf springs each have one end secured to the respective side member and another end secured to the respective beam end. Thus the beams can move generally vertically on the springs. Respective beater arms extending generally parallel to the screen from the beater beams have outer ends engageable with the underside of the screen.

Abstract: A vibratory screen separator has cylindrical cleaner elements engaging the lower surface of a horizontal screen with the cleaner elements having a center of gravity offset from their longitudinal axis so that vibration imparted to a supporting perforated surface effects enhanced movement of the cleaner elements. Screen clamp means are pivotally mounted to swing to an external position with respect to a floating tub assembly in which the screen is positioned to permit removal of the screen and a subsequent removal for repair or replacement of a unitary vibrator unit mounted in a housing extending axially below the screen.

Abstract: A vibratory power screen normally has a generally planar and longitudinally extending frame having upstream and downstream ends and a pair of laterally spaced side members extending longitudinally between the ends. A generally planar screen is spanned longitudinally within the frame normally between its ends. The entire frame is tilted down from the upstream to the downstream end. Thus when particulate material is loaded onto the screen at the upstream end the particulate material migrates down along the screen to the downstream end with the smaller fractions falling through the screen. This sieve has respective pivot plates rotatably supporting beater shafts on the side members of the frame for rotation about respective substantially parallel adjustment axes extending transversely of the frame underneath the screen. Beater arms, which extend parallel to the screen from the beater shafts, have outer ends which engage the underside of the screen.

Abstract: A device for cleaning or refining herbage or herbal substances which operates to separate out twigs, seeds or other roughage by an agitating and straining process. The device includes a cylindrical main body internally divided into a pair of chambers by a fixed strainer or wire screen with a pair of removable end caps enclosing the chambers at each end of the cylinder. A plurality of metallic balls, preferably four, are loosely confined within one of the chambers within which the herbage to be refined is introduced. Vigorous shaking of the device will cause refined herbage to pass from the chamber containing the balls, through the strainer or screen and into the other chamber where the refined herbage may be collected in one of the end caps.

Abstract: A plurality of weighted springy arms are formed integral with, and so as to extend laterally, to one or both sides of, a resilient mounting strip that is disposed beneath, and in contact with, the lower surface of the screen deck of a vibrating screen. The intended vibrating action of the vibrating screen induces an oscillating movement of the weighted springy arms to effect a rapping action of the weighted ends of the arms against the undersurface of the screen deck to loosen material which may have lodged in or plugged the screen openings and to unclog same.The resilient strips disposed on the extreme sides of the screen need only have weighted springy arms on the side thereof towards the central portion of the screen deck if space on the other side of the strip does not permit proper disposition and action of such an arm; while the strips disposed in the central section of the vibrating screen have arms extending from both sides of the resilient strip.

Abstract: A rotary screen appliance for the sifting of sand at a construction site is fittable directly to the mouth of a motorized driving device such as a cement mixer. A dismantable screen cage is connected to an armature preferably having three guide arms. A fastening portion is slidably attached to each guide arm and extends at an acute angle therefrom such that the fastening portions may engage the mouth of a cement mixer and thereby lock the screen cage thereto. Rotation of the cement mixer causes rotation of the screen cage. A device for rapping on the screen cage and thereby shaking it as it rotates is also provided.

Abstract: A screening machine (FIG. 3) having a vibrator constructed so that the striking elements 7 move substantially only vertically. The vibrator comprises springs having crossing elements 2,3 mounted on the frame and connecting member 4. The connecting member 4 can be moved to rotate the striking elements about the crossing point D of the crossing elements, which is disposed substantially in the plane of the spring.

Abstract: In a rotary screen for sorting wood or other particles of a desired size from other particles such as fine, moist, sticky sawdust particles, a plurality of balls are suspended beneath the screening surfaces in a manner such that the gyratory motion of the rotary screen imparts a resonant, pendulum-type motion to the balls, causing them to strike the bottom of the screening surfaces and loosen particles from the screen which would tend to clog the openings therein. The rotary screen includes a collection tray or "dust pan" to catch undersize particles, and a plurality of balls are also suspended beneath the bottom surface of the dust pan to strike it and prevent material build up in the dust pan.

Abstract: A transporting, sieving or filtering base or bottom consists preferably of extensible or bendably elastic materials and is divided into zones and supported. The individual zones are fixed between transverse elements or carriers which either belong to a driving frame system or constitute transverse braces of a frame or other supporting elements. The invention is particularly characterized in that the carriers or transverse braces limiting the zones have supporting or moving elements which make them movable individually upon a corresponding sliding roller and an elastically movable guiding path or in an elastically movable guiding profile. The movement is so carried out that the carriers or braces are shiftably coupled with each other while moving in the same direction in or upon these elements when the cross-sections connecting them reach their greatest possible longitudinal extension.