Abstract: Extruder based print head (1) for 3D printing with a material feed unit (2) for providing material in granular and/or liquid feed form, a material extrusion unit (3) arranged to receive the material in granular and/or liquid feed form and transform the material into liquefied material in print form, and a nozzle unit (4) in fluid communication with the material extrusion unit (3), the nozzle unit (3) comprising an output channel (5) and a nozzle (6) arranged to output the liquefied material. Furthermore, an internal volume enlargement unit (7) is provided in fluid communication with the output channel (5) of the nozzle unit (4), wherein the internal volume enlargement unit (7) has a first internal volume in a first operational status and a second internal volume in a second operational status, wherein the second internal volume is larger than the first internal volume.

Abstract: Methods and systems that include introducing blowing agent into a hopper of a polymeric foam system.

Abstract: Methods and systems that include introducing blowing agent into a hopper of a polymeric foam processing system.

Abstract: A microbubble generator is described, that enables inexpensive manufacturing cost and miniaturization to generate micro bubbles in certain embodiments, without adopting the complicated prior art venturi tube structure. One embodiment has a water supply side joint on one end of a main tube which is formed as a cylinder and a water drain side joint on the other. The supply side joint and the drain side joint are connected with a water channel that runs along the axis of the tube, and in the middle of said channel there is a narrower, restricted channel whose internal diameter is 6 millimeters or less. A water supply side channel is constituted between the supply side joint and the restricted channel, and a water drain side channel is constituted between the restricted channel and the drain side joint.

Abstract: A scent diffusion device including an air flow generator; an outlet, the generator and outlet defining a path for the flow of air therebetween; a plurality of scent diffusion modules comprising: a slide moveable by sliding inside a housing between at least one diffusion position and a non-fragrant position; at least one first window in the slide intended to receive a source of fragrant molecules; a second window in the slide, wherein, in the diffusion position, the first window faces a window in the housing and in the non-fragrant position, the second window faces the window in the housing, and wherein the modules are positioned such that window axes of the housings of different modules are aligned on the path; and a device permitting the slides to be brought individually onto one of the positions; the flow of air successively traversing the windows of the housings, the first window and the second window of the slides according to positions of the latter.

Abstract: A fuel supply assembly for a two-stroke crankcase scavenged combustion engine that is operated with layered scavenging is presented. The assembly includes a housing and a first and second parallel channels extending through the housing. The first channel is for a fuel/air mixture and the second channel is for auxiliary air. The assembly also includes a partition wall extending in a plane between the first and second channels and arranged upstream and downstream of at least one butterfly valve. The assembly also includes a protruding section which extends across the butterfly along the axis of rotation at least on the downstream side of the butterfly. The housing includes fuel-conveying idling ducts that open in the first channel in the region where the butterfly valve, sealing member on the partition wall, substantially contacting the protruding section at least on the downstream side of the butterfly.

Abstract: A carburetor for a stratified scavenging two-cycle engine, in which a throttle valve and a air valve are formed in a valve element that is a single cylindrical member in which a throttle through-hole and an air through-hole are diametrically formed and which is rotatably fitted in a body, the mixture passage and the air passage being formed piercing through a body, wherein the height of the body is decreased so as to miniaturize the carburetor as a whole, and the mixture passage (6) and the air passage (9) are formed in a single cylindrical common hole (69) in which the mixture passage (6) and the air passage (9) are partitioned by a partition wall (68).

Abstract: A scavenging carburetor having an improved relationship between scavenging air flow and fuel-and-air flow to an engine over its range of operating conditions. The carburetor has a butterfly throttle valve and a plug-type scavenging valve. Levers are attached to support shafts of the valves and are connected to each other by a connecting rod so as to synchronize movement of the valves. Because of the different opening angle versus open area properties of the two valves, the supply of the scavenging air is minimized over a low speed range of the engine so as to achieve a stable low speed operation and a stable acceleration from idle conditions and a relatively large amount of scavenging air is supplied over a high speed range of the engine for the given amount of fuel-and-air mixture that is supplied. Therefore, the fuel-and-air mixture supply and scavenging air supply is better matched to the requirements of a particular engine than was possible with conventional combinations of valves.

Abstract: An interlocking lever having first and second cam faces is mounted on a throttle valve stem, and a throttle valve is arbitrarily opened to perform start-up in a state in which the first cam face makes contact with the choke valve lever and the interlocking lever is stopped during low-temperature start-up with the choke valve closed. After the choke valve has been returned to the fully open position, the throttle valve alone is opened with a small degree of opening to perform low-load operation; and in the mid- and high-load region, the interlocking lever integrally turns with the throttle valve, the second cam face pushes the air valve lever, and the throttle valve and air valve are caused to open and close proportionally. Preferably, the degree of opening of the throttle valve for low load operation is adjustable.

Abstract: A carburetor for a stratified scavenging two-cycle engine, in which a throttle valve and an air valve are formed in a valve element that is a single cylinderical member in which a throttle through-hole and an air through-hole are diametrically formed and which is rotatably fitted in a body, the mixture passage and the air passage being formed piercing through a body, wherein the height of the body is decreased so as to miniaturize the carburetor as a whole, and the mixture passage (6) and the air passage (9) are formed in a single cylindrical common hole (69) in which the mixture passage (6) and the air passage (9) are partitioned by a partition wall (68).

Abstract: A versatile rotary carburetor has an idle adjustment needle, a high speed adjustment needle, and preferably an air bypass screw which are substantially parallel to one another and are axially exposed for adjustment in a substantially common direction. Preferably a cammed rotary throttle valve is seated in a body of the carburetor for rotation about and axial movement along an axis. The rotary throttle valve intersects a mixing passage in the body, and carries a through-bore that variably generally aligns to the mixing passage upon rotation of the throttle valve. The throttle valve projects axially through an external surface of the body and threadably receives the idle adjustment needle oriented concentrically to the axis.

Abstract: A carbureted two-cycle engine including an intake channel, a choke valve in the intake channel fixed to a pivotable choke valve shaft and lever, and a throttle valve in the intake channel fixed to a pivotable throttle valve shaft and lever. The engine includes an air channel in communication with fresh air, and an air valve fixed to a pivotable air valve shaft and lever. A piston within a cylinder of the engine includes a transfer port for intermittently connecting the intake channel and the air channel with a combustion chamber. An activating lever pivotably mounted to the air valve shaft transmits movement of the throttle lever to the air valve lever after a predetermined angle of rotation of the throttle lever. A fast idle latch is engagable by the choke lever to hold the throttle lever in a fast idle position until the throttle lever is separately moved.

Abstract: Method of and mechanism for regulating fuel feed from a rotary valve type carburetor to an associated engine. A carburetor bypass air passage variably communicates the throttle valve hole with a bypass air source at engine idle setting of the throttle valve. The bypass air passage outlet is closed by movement of the throttle valve out of idle setting toward high speed. At an initial carburetor-to-engine set-up and calibration, a bypass regulating valve is maintained open while the engine is running at idle speed. Then the fuel-regulating needle is adjusted to maximum fuel to air (F/A) mixture ratio permitted by applicable engine exhaust quality regulations, and then is permanently set and sealed. During subsequent end user operation of the engine, the bypass valve is closed only when preparing to crank the engine for starting to thereby provide an enriched fuel-to-air mixture for starting of the engine. When the engine is running under its own power the bypass valve is maintained open.

Abstract: Method of and mechanism for regulating fuel feed from a rotary valve type carburetor to an associated engine. A carburetor bypass air passage variably communicates the throttle valve hole with a bypass air source at engine idle setting of the throttle valve. The bypass air passage outlet is closed by movement of the throttle valve out of idle setting toward high speed. At an initial carburetor-to-engine set-up and calibration, a bypass regulating valve is maintained open while the engine is running at idle speed. Then the fuel-regulating needle is adjusted to maximum fuel to air (F/A) mixture ratio permitted by applicable engine exhaust quality regulations, and then is permanently set and sealed. During subsequent end user operation of the engine, the bypass valve is closed only when preparing to crank the engine for starting to thereby provide an enriched fuel-to-air mixture for starting of the engine. When the engine is running under its own power the bypass valve is maintained open.

Abstract: A rotary throttle valve carburetor for a two cycle engine reroutes a portion of intake air and introduces the air around the circumference of a fuel feed tube. A rotary throttle, rotatable and vertically moveable, fits into a cylindrical chamber intersecting an air intake channel through a carburetor body. A needle supported by the rotary throttle fits into the fuel feed tube which extends from a fuel metering chamber within the carburetor body into a throttling bore extending laterally through the rotary throttle. An intake portion of the air intake channel expands conically toward an upstream side. An air guide tube is aligned co-axially and radially outward from a fuel feed tube forming an air passageway there between. The intake air portion flows through the air passage from the intake portion of the air intake channel and into a bottom space of the cylindrical chamber beneath the rotary throttle.

Abstract: A starting system for an internal combustion engine is provided for enhancing engine startability and performance by simultaneously controlling the volume of air flowing through a carburetor and the ratio of an air/fuel mixture through a single manual operation. The starting system is constructed to utilize atmospheric air control feed back to a carburetor and includes a piston disposed with a chamber which accesses two atmospheric ports. When the piston is positioned to fully close a first of the ports, a second of the ports is fully open. Similarly, when the piston fully opens the second port, the first port is fully closed. The two atmospheric ports access the carburetor idle system and intake manifold of the engine respectively. For starting of the engine in cold temperatures, the starting system also includes a fuel prime arrangement for enriching the ratio of air/fuel delivered to the engine.

Abstract: Gas-flow control apparatus for delivering a constant volumetric flow of gas to an extruder through which a molten thermoplastic resin is being processed. The gas-flow control apparatus consists of a compressor having an intake and a discharge and is operable to produce a constant volumetric gas flow output. A discharge conduit connects the compressor discharge with the extruder and a feedback loop system consisting of a feedback conduit connects the compressor discharge with the compressor intake and includes a bypass valve. The feedback loop system thus is operable to divert a selected fraction of the compressor output back to the compressor intake thereby to control the volume of gas supplied to the extruder. Flow measuring apparatus measures the volume of the supply gas delivered to the compressor which is equal to the volume of the gas delivered to the extruder and regulates the bypass valve so that a predetermined volumetric flow of gas to the extruder is maintained.

Abstract: A process and related apparatus for regulating the fuel-air mixture delivered to the combustion chambers of an internal combustion engine by the admission of auxiliary air the quantity of which corresponds with the quantity of the aspirated fresh air forms the subject of this invention. An air bypass line is provided for bypassing a venturi constriction disposed in a suction tube upstream of a throttle flap valve. Associated with the air bypass line are a pressure regulating valve, a bypass throttle device and a control circuit including a pair of shut-off valves, or alternatively a three way valve, with an appropriate control for controlling the valves and accordingly the reduced pressure produced by the venturi constriction, which is communicated to the bypass throttle device, or the control pressure of the pressure regulating valve.

Abstract: The fuel preparation system of an internal combustion engine is provided with an air bypass line which delivers fresh air directly to the intake manifold downstream of the mixture generator, which may be a carburetor, for example. The air flow through the bypass is controlled, firstly, by a valve actuated in synchronism with an air flow meter in the main induction tube and, secondly, by a pressure controlled valve. The pressure controlled valve is connected to sources of different pressure by solenoid valves which are operated on the basis of engine information, for example the exhaust gas composition.