Abstract: A juicing machine comprises an electric motor; a variable frequency drive configured to control the speed of the electric motor; a juicing mechanism that has at least one extraction assembly that operates cyclically to extract juice; and at least one sensor that determines the position or positions of the extraction assembly during a cycle.

Abstract: Fleece filter including a filter chamber and a fleece retainer for intimately retaining fleece against inside primary filter chamber plates on being extended between a feed reel and a take-up reel. Fleece filter including a fleece filter controller having a feed reel with a feed reel encoder for enabling accurate measurement of fresh fleece dispensed from a fleece roll wherein a length of fresh fleece is a function of a fleece roll's instantaneous external diameter, fleece thickness, and a number of rotations of fleece unwound from a feed reel. Fleece filter including a fleece filter housing having a polluted water inlet, a filtered water outlet and a chemical media basket mounted on the filtered water outlet such that substantially the entire flow of filtered water from the filtered water outlet immediately subsequently passes through the chemical media basket.

Abstract: A first coffee brewing and dispensing system that includes a removable grounds chamber assembly that includes a basin for holding ground coffee, an extendable dispensing spout, and a valve mechanism for opening and closing the dispensing spout; a brewing chamber assembly positioned on top of the removable grounds chamber assembly; and a lid/plunger assembly adapted to be inserted into the brewing chamber and removable grounds chamber, wherein the lid/plunger assembly includes a press rod, a handle mounted on the press rod, wherein the handle includes a trigger mounted therein, a lid mounted on the press rod below the handle, a wiper assembly mounted on the press rod below the lid; and a filter assembly mounted on the press rod below the wiper assembly, wherein the wiper assembly may be moved independently of the filter assembly by actuating the trigger in the handle.

Abstract: The present inventive concept relates to an oil-water separator for oil-containing residues, including: an outer casing configured to allow residues containing oil and water to be put thereinto; a filter member for separating the oil and the water contained the residues from each other; and a filter support frame coupled to the filter member in such a manner as to be separably seated inside the outer casing, wherein the oil and the water are passed through the filter member at different speeds from each other.

Abstract: A belt conveyor for printing sheets includes an outer belt on which the printing sheets rest during transport. The belt conveyor also includes an inner belt. A chain is disposed between the inner belt and the outer belt. The inner belt drives the chain and the chain drives the outer belt.

Abstract: The infusion brewer has a filter path forming a continuous loop around a plurality of rotary shafts, the plurality of rotary shafts being operable to cycle a continuous loop filter along the filter path, the filter path having a steeping area; and an infusion enclosure having a bottom opening positionable into an infusion position against the continuous loop filter at the steeping area.

Abstract: Methods and systems are provided for regeneration of a particulate filter including a filter body having a filter paper looped along a plurality of rolling guides. At least one rolling guide may be a roller heater having a motor and a heater. Activation of the roller heater based on a pressure difference across the particulate filter regenerates the particulate filter during a regeneration phase and positions a regenerated section of the filter paper for trapping soot in a subsequent soot loading phase.

Abstract: An air purifier includes a main body having an inlet configured to receive air and a discharger configured to discharge the air. The air purifier also includes a filter disposed within the main body and configure to purify contaminates from the air. The air purifier also includes a contamination sensor disposed adjacent to the filter and integrally includes a light emitter configured to emit a light toward the filter and a light receiver configured to receive the light emitted from the light emitter.

Abstract: A pool cleaning robot that may include a fluid inlet, a filter; a winding mechanism and a holding mechanism; wherein the holding mechanism is configured to hold the filter; wherein the winding mechanism is configured to perform a winding of the filter thereby removing a filter portion that was positioned in a filtering position and placing another filter portion in the filtering position; and wherein the filter portion, when positioned in the filtering position, is configured to filter fluid that enters through the fluid inlet.

Abstract: A pool cleaning robot that may include a fluid inlet, a filter; a winding mechanism and a holding mechanism; wherein the winding mechanism is configured to perform a winding of the filter thereby removing a filter portion that was positioned in a filtering position and placing another filter portion, that was previously stored by the holding mechanism, in the filtering position; wherein the filter portion, when positioned in the filtering position, is configured to filter fluid that enters through the fluid inlet; and wherein the holding mechanism is configured to hold the filter and to store folded and unused filter portions.

Abstract: A product that is an apparatus for removing debris from water containing such debris using a perforated plate, a backer plate, and a skimmer, positioned adjacent the back of the perforated plate to provide a means of removing debris from the perforated plate without scraping the debris from the perforated plate, the skimmer bar and the backer plate being synchronized in their movement.

Abstract: A filter setter apparatus includes a housing to which an upper jaw and a lower jaw removably connect. The upper jaw has the shape of a rectangular bar with a plurality of upper jaw overlaps depending from either side of the upper jaw. The upper jaw has a mass causing a gravitational force acting on the upper jaw to clamp a filter inserted between the upper jaw and the lower jaw. The upper jaw partially encloses the lower jaw between the plurality of upper jaw overlaps. A filter setter system incorporates the above housing with a plurality of the above upper jaws and a plurality of the above lower jaws.

Abstract: An air filtration apparatus operable to be coupled with an air return of a conventional HVAC system wherein the air filtration apparatus is configured to supply a continuous supply of unused air filtration media. The air filtration apparatus further includes a frame having four sides and an opening configured to accommodate any size air return. A first media receptacle and a second media receptacle are mounted on the frame. Disposed within said first media receptacle and said second media receptacle is an air filtration media, wherein the air filtration media is substantially disposed within the first media receptacle in its first position and is disposed within the second media receptacle in its second position. A drive assembly and fan are operably coupled to the air filtration media operable to transition the air filtration media intermediate its first position and second position as a result of airflow through the air return.

Abstract: Provided is a filtration device used in order to improve the water quality of the final effluent in an advanced treatment facility for sewage and wastewater. The variable filtration device (10) of this type comprises a filtration tank (20), a filtration unit (30), a winding unit (50) and a filter cloth (12) arranged in such a way that the filtration conditions can be controlled by adjusting the number of turns of winding and the extent of pulling of the filter cloth in the chamber where the filtered water is formed, thereby allowing relatively easy porosity control as compared with the prior art, so enabling ready adjustment to the target water quality and water quantity even when the quality of the inflowing water varies.

Abstract: An apparatus for collecting solid materials from a fluid is provided. The apparatus includes a conduit configured to allow the fluid to flow therethrough. The apparatus further includes a mesh extending across the conduit. The mesh is configured to allow the fluid to flow therethrough and to allow a solid material to precipitate out of the fluid onto the mesh.

Abstract: The invention relates to a method and apparatus for filtering contaminated water from an oil or gas well.

Abstract: Apparatus for washing and dewatering pump comprising a pair of rotatable press rolls with permeable outer surfaces, a casing comprising a vat in which the rolls are installed, and a feed for feeding the pulp to the gap formed between the vat and the press roll is disclosed. The vat includes a first side vat segment partially enclosing the first press roll and a second side vat segment partially enclosing the second press roll and casing members for each of the vat segments, the first casing member being pivotable about an axis of rotation and between closed and open positions, pulp distribution devices for distributing pulp onto the press rolls, at least one of the pulp distribution devices being mounted on the casing member whereby it is moved away from the press roll together with the casing member when it is opened.

Abstract: A system and method for the treatment of a fluid comprising at least two of the fractions solid particles, liquid and/or gas is described having at least one inlet portion and two or more outlet portions, and being arranged to separate solid particles over a predetermined size from the liquid by at least one screening apparatus and then carrying the fractions out of the system. The system (1) being substantially fluid-tight between the at least one inlet and outlet inlet portions and being provided with at least one underpressure-generating device arranged to provide an underpressure in the system.

Abstract: A method and device for separating particles from a liquid having particles therein, using a filter sized to permit the liquid to flow through pores, while retaining a substantial portion of the particles on the filter, with an absorbent layer contacting the back of the filter to facilitate liquid movement away from the particles.

Abstract: A compact biological treatment assembly, apparatus and methods are disclosed, the apparatus including a movable belt biological contactor having selected microbial cultures established thereon. The apparatus further includes a tank having a volume for receipt of wastewater to be treated, first and second drums positioned at the tank each connected to an end of the belt contactor, and a motor or motors together with a controller for rotating the drums cooperatively to move the belt contactor between the drums thereby coiling and uncoiling the belt contactor on the drums.

Abstract: A machine includes a heat exchanger for an engine having a heat exchanger core and a filtration system. The filtration system includes a flexible filter sheet coupled with at least one take-up roller and a filter cleaner adapted to clean the filter via compressed air. A method of operating a machine cooling system includes rotating a rotatable drive element coupled with a filter, and cleaning the filter by directing compressed air therethrough.

Abstract: A filter apparatus for separating particles from a liquid having a tank with a feed inlet, a gravitational settling zone and a filtration zone arranged downstream of the settling zone. Inside the tank are two transversely spaced-apart endless chains with transversely extending drivers fixed between the chains, the drivers and chains together forming a conveying apparatus driven by gear wheels and a drive motor. The filtration zone includes a vacuum chamber, which is formed partly by the tank and is arranged underneath the solid particle filtration apparatus. Between the unfiltered liquid region and the filtered liquid region is a filter media strip, which is pulled through the tank along a path which changes direction by the chains and drivers. Each chain has flexible metal strips that extend along the chain and over a plurality of chain links. The metal strips are fixed at one end and partially overlap.

Abstract: A filtration system (10) for removing contaminants from a fluid is provided. The system includes a housing (44) having a convex shaped base (78) and a top (84), with filter media (46) disposed within the housing. The filter media may take the form of a roll having a first end formed by edges of the wound filter media and convex in shape. The system may further include a seal (56) adapted to impede channeling of the fluid in proximity to the core through substantially sealing annuluses formed between adjacent wraps of filter media by engaging the edges of the filter media in proximity to the core without substantially radially displacing the filter media. A fluid passageway may pass through the housing, wherein the passageway (20, 24, 40, and/or 42) is sized sufficiently small in cross-sectional area to substantially impede the flow of fluid through the passageway due to gravity.

Abstract: A filter apparatus for separating particles from a liquid having a tank with a feed inlet, a gravitational settling zone and a filtration zone arranged downstream of the settling zone. Inside the tank are two transversely spaced-apart endless chains with transversely extending drivers fixed between the chains, the drivers and chains together forming a conveying apparatus driven by gear wheels and a drive motor. The filtration zone includes a vacuum chamber, which is formed partly by the tank and is arranged underneath the solid particle filtration apparatus. Between the unfiltered liquid region and the filtered liquid region is a filter media strip, which is pulled through the tank along a path which changes direction by the chains and drivers. Each chain has flexible metal strips that extend along the chain and over a plurality of chain links. The metal strips are fixed at one end and partially overlap.

Abstract: A method and apparatus for sealing the opposed side edges of a fluid treating belt filter (3) by employing an inflatable elastic tube (18). Opposed sealing surfaces are spaced apart from each other defining a gap there between which can be brought into sealing relationship by activation of the tube (18). The tube (18) being tested prior to and during sealing. Fluid that bypasses the seal are collected for rycycle.

Abstract: A filter assembly for ultra-filtration of fluids such as waste water comprises a porous tube which is incrementally advanced into the fluid so as to expose a fresh portion periodically and maintain a flow rate over a period of time.

Abstract: A system for use in filtering a slurry using air pressure to squeeze the slurry material and dewatering it. The system including a source of slurry, a chamber, a filter belt that passes through the chamber, a manifold inlet supplying the slurry to a first side of the filter belt to form a uniform moist cake of the filter material, an inlet seal and an outlet seal to seal a belt inlet and a belt outlet formed on the chamber, and a source of the pressurized air selectively applicable to the chamber to dry the moist cake of filtered material.

Abstract: An apparatus for filtering viscous material, in particular thermoplastic synthetic plastic material, comprises a screw (24), which presses the material to be cleaned from an upstream conduit (3) of a supply housing (2) towards a band-shaped screen (4). The screen (4) is abutted on its downstream side by a perforated plate (6) against the pressure of the supplied material. The band-shaped screen (4) can be displaced for replacement of a soiled band section by a fresh band section. For facilitating this displacement a device is provided, which comprises a closure means (30) that is disposed on the upstream side of the screen (4), by which closure means the upstream conduit (3) for the material to be filtered can be closed at least substantially. On the upstream side of this closure means (30) a storage space (36) for material to be cleaned is connected to the upstream conduit (3).

Abstract: An auxiliary oil filtration system and method for filtering oil in an engine is provided. The auxiliary oil filtration system consists of an auxiliary filtration device, an integral oil transfer pump controlled by an electric motor and that is in electrical communication with an electrical control unit, an electronic pressure sensor, fluid conductors, and means for connecting hardware. The auxiliary filtration device is separate from the primary engine lubrication system, and includes a media supply reel having a roll of filtering media thereon which is moveable to a take-up reel. A media indexing system advances the media supply reel as the filtering media becomes plugged. An electronic pressure sensor dictates the advancement of the filtering media when a pre-determined differential pressure across the filtering media is attained. When all of the filtering media has been transferred from the supply reel to the take-up reel, the cartridge is replaced.

Abstract: A liquid filter method includes use of a filter media belt enclosed by sealably mated cover pan and floor pan defining a vacuum chamber connected to a sealed clean liquid tank, with clean liquid pumped out continuously to draw liquid to be filtered into an upper region of the filter chamber via an inlet hose connected to a source of liquid to be filtered. The cover pan is lifted after the vacuum is relieved to allow indexing of the filter media belt. A main control valve to the clean liquid tank is closed and pumping liquid continues during indexing. A vacuum control device limits the maximum vacuum developed in the clean liquid tank and a vacuum pump removes air from the tank for priming and to eliminate excess accumulated air. A hose seal for the cover is mounted to the filter belt to be moved in and out by the belt movement, allowing cleaning of the seal. A double loop hose seal creates an intervening space into which liquid is directed to minimize air leaks.

Abstract: A self-cleaning strainer which may be installed upstream of a heat exchanger to prevent debris greater than a critical size from reaching the heat exchanger. The strainer is preferably mounted just upstream of a heat exchanger in order to minimize the possibility of debris reaching the heat exchanger. The strainer comprises a screen element which can be advanced across the flow path of the fluid between two rollers. The screen element is placed so that the fluid must flow across the screen element face to continue through the process pipe; the screen may be perpendicular or parallel to the fluid flow axis of the strainer body or at an intermediate angle to it. Flow blocking members are used so as to direct the flow to pass through the screen element.

Abstract: An index filtration method is disclosed for filtering graft polyol dispersions. The method allows for the rapid filtration of large volumes of graft polyol dispersion in an economical manner. The process can be highly automated. The resulting filtered graft polyol dispersion mainly has particles of 25 microns or smaller and is stable under a variety of conditions for at least 9 weeks.

Abstract: An auxiliary oil filtration system and method for filtering oil in an engine is provided. The auxiliary oil filtration system consists of an auxiliary filtration device, an integral oil transfer pump controlled by an electric motor and that is in electrical communication with an electrical control unit, an electronic pressure sensor, fluid conductors, and means for connecting hardware. The auxiliary filtration device is separate from the primary engine lubrication system, and includes a media supply reel having a roll of filtering media thereon which is moveable to a take-up reel. A media indexing system advances the media supply reel as the filtering media becomes plugged. An electronic pressure sensor dictates the advancement of the filtering media when a pre-determined differential pressure across the filtering media is attained. When all of the filtering media has been transferred from the supply reel to the take-up reel, the cartridge is replaced.

Abstract: A paint overspray particulate filtration system includes a collection tank, a floatation consolidation tank, and a vacuum filter assembly having a filter medium that traverses a pair of vacuum chambers. A positive displacement vacuum producer for the first vacuum chamber discharges a first supply of pressurized air at a temperature preferably greater than about 170° F. and a pressure preferably greater than about 6 psig, while a centrifugal compressor discharges a second supply of pressurized air at a temperature of perhaps up to 110° F. and at a pressure of perhaps 4 psig. The first pressurized air supply is heat exchanged with the second pressurized air supply, whereupon the cooled first pressurized air supply is directed through a submerged diffuser nozzle to aerate the collection tank and/or the consolidation tank. The warmed second pressurized air supply is directed onto the paint sludge carried atop the filter medium to enhance sludge dewatering.

Abstract: An auxiliary oil filtration system and method for filtering oil in an engine is provided. The auxiliary oil filtration system consists of an auxiliary filtration device, an integral oil transfer pump controlled by an electric motor and that is in electrical communication with an electrical control unit, an electronic pressure sensor, fluid conductors, and means for connecting hardware. The auxiliary filtration device is separate from the primary engine lubrication system, and includes a media supply reel having a roll of filtering media thereon which is moveable to a take-up reel. A media indexing system advances the media supply reel as the filtering media becomes plugged. An electronic pressure sensor dictates the advancement of the filtering media when a pre-determined differential pressure across the filtering media is attained. When all of the filtering media has been transferred from the supply reel to the take-up reel, the cartridge is replaced.

Abstract: In a method of reducing corrosion of a metal material, a substance such as semiconductor for generating an electric current by thermal excitation is coated or adhered on a metal material surface, to be exposed to a water having a high temperature of 150° C. or more, of a boiler and ducts or pipes, to which hot water heated by the boiler contacts, of a thermal electric power plant or a nuclear reactor structural material or ducts or pipes surrounding the reactor in a nuclear power plant.

Abstract: A fluid reclamation system is provided for separating large debris particles from a polluted fluid. The reclamation system includes a separation device with an endless screen installed onto driven cylinders. A basin is mounted within the screen for collecting the fluid after it passes through a top surface of the screen. A disposal mechanism discards large debris particles from the screen and discharges the large debris particles into a storage barrel.

Abstract: A method and apparatus for treating an aqueous-containing sludge in which the sludge is filtered on an elongate moving sheet of a water permeable unwoven fabric on paper. The moving sheet is folded and compressed between rollers whereby to express water therefrom. The folded moving sheet and contained sludge is dried, and the dried sheet and sludge is incinerated. Combustion heat from the incineration step is used in the drying step.

Abstract: A liquid filter apparatus includes a filter media belt enclosed by sealably mated cover pan and floor pan defining a vacuum chamber connected to a sealed clean liquid tank, with clean liquid pumped out continuously to draw liquid to be filtered into an upper region of the filter chamber via on inlet hose connected to a source of liquid to be filtered. The cover pan is lifted after the vacuum is relieved to allow indexing of the filter media belt. A main control valve to the clean liquid tank is closed and pumping liquid continues during indexing. A vacuum control device limits the maximum vacuum developed in the clean liquid tank and a vacuum pump removes air from the tank for priming and to eliminate excess accumulated air.

Abstract: A pressure filter includes two continuous mating surfaces movable relative each other and a filter medium capable of being disposed therebetween. A surface, provided for supporting the filter medium, is bounded by and is substantially coplanar with one of the continuous mating surfaces. The filter further includes a shallow inlet cavity, bounded by the other of the continuous mating surfaces, and an inlet distributor in communication with the inlet cavity. The inlet distributor includes at least one opening and may be of internal or external type. When the mating surfaces are pressed together, a shallow filtration chamber is defined by the inlet cavity and the filter medium. The filter apparatus may include a plurality of shallow filtration chambers, stacked one above the other, and constructed as described above.

Abstract: An apparatus for removing solids from a liquid/solid mixture disposed in a tank and rising to a mixture level, the apparatus including a suction assembly defining a suction opening, the suction assembly linked to a vacuum that causes suction at the opening, a support assembly formed about the suction surface including first and second essentially circular housing walls having wall edges and a filter belt loop sealed to the edges and sized such that the belt is slack and subject to deformation between the edges, a belt section disposed to cover the suction opening and a processor controlling a motivator to periodically alter belt position with respect to the suction opening.

Abstract: A differential pressure filtering system for removing debris from a fluid includes a generally cylindrical drum having a top shell and a bottom shell. An inlet port receives pressurized fluid into the drum. A filter medium is sandwiched between the top and bottom shells for filtering the fluid. A screen is disposed across the bottom shell for supporting the filter medium. An outlet port discharges filtered fluid from the drum. The top and bottom shells have generally rounded end portions which align to form a pair of domed drum ends for providing structural rigidity to withstand pressure created in the drum by the pressurized fluid. In a preferred embodiment, the pressure filtering system provides a filter cleaning operation utilizing cylinders and quick clamp mechanisms externally mounted on opposing sides of the drum to open and close the top and bottom shells. An O-ring seals the top and bottom shells in the closed position.

Abstract: A cleaning device for removing solid impurities from viscous material, in particular molten plastics material, comprising, inside a housing (1), a filter band (5) for separating out solid impurities which can be moved in the longitudinal direction of the housing. The filter band (5) is wrapped around a curved supporting area (7) of a fixed supporting member (3) at an angle of wrap of preferably approximately 180°, and is guided on both sides of the curved supporting area (7) in planar supporting areas (15, 17) which lie tangentially and flush against the curved supporting area (7). To reduce the kinetic resistance of the filter band (5), the curved supporting area (7) and at least partly the planar supporting areas (15, 17) are provided with channels (25) extending in the direction of transport of the filter band (5).

Abstract: An apparatus for thickening liquids or thin sludges by water extraction, having a bottom, a tub having an underside, stands supporting the tub on the bottom, a ripening time chamber for receiving the liquids or thin sludges, first devices for admixing a polyelectrolyte for flocculation in the ripening time chamber, a conveyor belt for further dewatering the liquids or thin sludges, and second devices for delivering liquid extracted from the conveyor belt and thick sludge discharges. At least the conveyor belt, the ripening time chamber and the second devices are accommodated in the tub, which thus acts as a frame and a lateral boundary for the conveyor belt, the ripening time chamber and the second devices. All connections required for operation are disposed on the underside of the tub, and the underside of the tub is spaced above the bottom by the stands.

Abstract: According to a waste water treatment method and apparatus of the present invention, a permeable sheet 3 is fed into a treatment tank 2 in which a stream is formed. The waste water, which flows downstream, is caused to pass through the permeable sheet 3, while the permeable sheet 3 travels in the treatment tank 2 so as to traverse the surface of the waste water on a downstream side in the flowing direction of the waste water. Therefore, not only the sludge in the waste water but also the oily substances floating in the waste water can be collected and removed because they cling to the permeable sheet 3 and are gathered by it. As a result, a waste water treatment tank 2 and the like can be maintained in a usable state for a long time. In addition, there can be obtained a treated water to which microbial treatment can be applied.

Abstract: According to a waste water treatment method and apparatus of the present invention, a permeable sheet 3 is fed into a treatment tank 2 in which a stream is formed. The waste water, which flows downstream, is caused to pass through the permeable sheet 3, while the permeable sheet 3 travels in the treatment tank 2 so as to traverse the surface of the waste water on a downstream side in the flowing direction of the waste water. Therefore, not only the sludge in the waste water but also the oily substances floating in the waste water can be collected and removed because they cling to the permeable sheet 3 and are gathered by it. As a result, a waste water treatment tank 2 and the like can be maintained in a usable state for a long time. In addition, there can be obtained a treated water to which microbial treatment can be applied.

Abstract: The invention relates to a process for the manufacture of photopolymer printing blocks, which are utilizable for producing printed matter by flexography, typography or dry offset, of the type including a stage for polymerizing areas by exposure to ultraviolet rays; a stage for engraving non-polymerized areas by immersion and brushing in an engraving bath contained in an engraving tank, the bath becoming loaded with dissolved particles or particles in suspension during the engraving stage; and a separation of the constituents of the engraving bath, with the liquid obtained at the time of separation being injected back into the engraving tank, characterized in that the separation consists of filtration, during which the particles are progressively eliminated. The invention also relates to an engraving device for carrying out the process.

Abstract: A filter system employs a pressure differential to draw liquid from a first liquid vessel through a filter media to a filtered liquid chamber. A pressure assembly generates a reduced pressure in the chamber. One embodiment of the filtration apparatus includes a liquid vessel above a filtered liquid chamber. A laterally extending fluid-pervious support forms a septum between the liquid vessel and the filtered liquid chamber. The support can be a perforate plate and supports filter media. The apparatus includes a wheel element mounted in spaced relation to the perforate plate and at least a portion of which is located in the vessel. An indexing mechanism, illustratively employing a pneumatic actuator selectively rotates the wheel element for indexing the media.

Abstract: A modular filter apparatus is formed from stacked filter modules. Slurry to be filtered flows into the apparatus through a flowmeter and check valve into a header. The flow of slurry then branches off through feeders to each of the filter modules. Connected to the header is a slurry supply source, a cakewash supply source and a header drain. The modules are coupled to a hydraulic jack mechanism and an upper strongback.

Abstract: A self-locking filter-screen feeding device for plastic material; the device comprises a carriage which may be reciprocated on guide rods parallelly extending to a filter band movable across a flow-path for the plastic material to be filtered in a filter apparatus. The carriage is provided with a resting surface for the filter band and pressure members, angularly rotatable operatively connected to actuators for selectively engaging and urging the filter band against the resting surface and for reciprocating the carriage along the guide rods.