36results about How to "Suppress pressure changes" patented technology

A piezoelectric inkjet printhead, and a method of manufacturing the same, includes an ink inlet for allowing inflow of ink, a plurality of pressure chambers to contain ink to be ejected, the plurality of pressure chambers being in communication with the ink inlet, a manifold formed in communication with the ink inlet, a plurality of restrictors connecting the manifold to respective first ends of the pressure chambers, a plurality of dampers at positions corresponding to respective second ends of the pressure chambers, the second ends being opposite the first ends, a plurality of nozzles in communication with the plurality of dampers for ejecting the ink, a plurality of actuators for applying a driving force to each of the pressure chambers for ejecting the ink, a damping membrane under the manifold for dampening a pressure change inside the manifold and a cavity under the damping membrane.

An ink cartridge is partitioned into a negative pressure generator chamber containing a negative pressure generator and a storage chamber containing an ink bag. The ink bag stores ink and supplies the ink to the negative pressure generator chamber through an ink port. The negative pressure generator absorbs and holds the ink by its capillary force, to keep pressure inside nozzles of a recording head negative to atmospheric pressure. Through a first air introduction hole, the air is introduced into the negative pressure generator chamber as the ink in the negative pressure generator chamber decreases. Through a second air introduction hole, the air is introduced into the storage chamber as the ink in the ink bag decreases. So variations in pressure inside the nozzles are suppressed, which makes ink discharge from the nozzles stable.

The invention relates to a station and method for filling a tank with a fuel gas. Said station includes at least one fuel gas source store and a gas transfer system having a first upstream end connected to the source store(s) and a second downstream end that is in fluid communication with the tank. The gas transfer system includes at least one control valve, characterized in that the at least one source store includes a rigid outer wall and a flexible sealing wall that is arranged inside the space defined by the rigid outer wall. The flexible wall defines a storage space for the fuel gas. The first upstream end of the system is connected to the storage space defined by the flexible wall. The at least one control valve is also characterized in that the space located between the flexible wall and the outer wall is connected to a system for transferring liquid into the source store in order to fill or extract the liquid in the source store and control the pressure in the store when filling and / or extracting fuel gas within the sealing wall.

A sheet conveying apparatus includes a conveying guide configured to guide a sheet which is conveyed by a conveying roller and a driven roller, a pressing spring configured to press the driven roller toward the conveying roller, a holding portion configured to be provided to be rotated about a shaft center of the driven roller and to receive a pressing force of the pressing spring, and a supporting portion configured to support the driven roller in a direction perpendicular to a sheet conveying direction to abut on or be separated from the conveying roller. The holding portion includes a facing portion which is disposed to face the conveying guide. The facing portion is separated from the conveying guide in a state where the driven roller abuts on the conveying roller. The facing portion abuts on the conveying guide when the driven roller is separated from the conveying roller.

The invention provides a flow regulating valve which can effectively reduce the noise generated due to a pressure fluctuation and a refrigerant separation phenomenon during passage through a valve port, and can achieve reduction of a pressure loss and so forth. The flow regulating valve 1 comprises a valve body 5 provided with a valve chamber 6 and a valve port 10, and a valve element 30 having acurved surface part 33 which changes the flow rate of fluid flowing through the valve port 10 according to a lift amount, in which the curvature or the control angle of the curved surface part 33 is continuously or stepwisely increased according as getting close to the end. The diameter of the valve port 10 is increased sequentially in three stages or more according as being separated from the valve chamber 6. Specifically, sequentially from the valve chamber 6 side, a first valve port part 11 having a diameter D1, a second valve port part 12 of diameter D2 (>D1) and a third valve port part 13of a diameter D3 (>D2) are provided. More preferably, D1, D2 and D3 are set such that (a valve port ratio: D2 / D1) and (a valve port ratio: D3 / D2) fall in a specific range.

The liquid ejection apparatus includes: a recording head which ejects an ejection liquid; a liquid container which accommodates air and the ejection liquid; a recording head connection flow channel which leads from the liquid container to the recording head; a pressure determination device which determines pressure of the ejection liquid accommodated in the liquid container; a first pressure supply device which drives a rotating body to remove or introduce the air from or to the liquid container so as to keep pressure of the air in the liquid container constant; a phase determination device which determines a phase of the rotating body; a second pressure supply device which is disposed in a pulsation suppressing flow channel that connects the liquid container with the recording head connection flow channel and which removes and introduces the ejection liquid from or to the liquid container; and a control device which controls rotation speed of the second pressure supply device in accordance with the phase of the rotating body determined by the phase determination device so as to cancel out variation of the pressure of the ejection liquid caused by the first pressure supply device.

An apparatus includes a process chamber, a substrate holder arranged in the process chamber, a first shield provided on the peripheral portion of the substrate holder, and a second shield provided inside the process chamber. The internal space of the process chamber is partitioned into an outer space and a process space to process the substrate, by at least the first shield, the second shield, and the substrate holder. The substrate holder can be driven along a driving direction perpendicular to a substrate holding surface. The length, in a direction parallel to the driving direction, of a minimum gap portion having a minimum size in a direction perpendicular to the driving direction between the first and second shields does not change even if the substrate holder is driven in the driving direction.

The vehicle-use alternator includes a cooling fan rotating in one with a rotating shaft thereof to generate cooling air diffusing substantially in a radial direction of the rotating shaft, to thereby cool a stator thereof. A housing thereof rotatably supporting the rotating shaft and housing the rotor is provided with a plurality of supporting members circumferentially spaced on a periphery thereof to which the stator is secured, and a plurality of ribs formed on the periphery which are circumferentially arranged between the supporting members so as to form a plurality of cooling air discharge windows circumferentially arranged on the periphery. The ribs are inclined towards a downstream side with respect to a rotational direction of the rotor, and shaped that their inclination angles towards the downstream side between two adjacent ones of the supporting members reduce with increasing distance from a closer one of the two adjacent ones of the supporting members.

In a control unit of a hydraulic control device, a vehicle state grasping unit grasps a vehicle state of a vehicle, and an output determination unit determines whether an operation point depending on the vehicle state that is decided by an operation point decision unit is over a discharging capability limit line. A pump controller stops a second pump or decreases a rotation number if the output determination unit determines that the operation point is over the discharging capability limit line.

The invention provides an axial flow type fan and fan wheel thereof for the higher problem of axial flow fan running noise is commonly used in the solution. This axial flow fan's impeller contains a wheel hub and several flabellum. This wheel hub has a rotation axis. The several flabellum combines in abovementioned wheel hub, and respectively this flabellum upwards has a lateral border in the footpath of this impeller, and this lateral border is an inlet air extreme point and an air-out extreme point at the ascending both ends of axle of this impeller. Wherein, abovementioned lateral border more has a convergent and plays the initial point, and the distance that this convergent plays the supreme rotation axis of stating of initial point is greater than the distance of above -mentioned inlet air extreme point to this rotation axis.

The invention provides a photographic fixing roller, a fixing device and an image forming device, which can keep the uniformity of a clamping part while preventing a wheel belt from deteriorating and deviating. A flexible layer (12) of the photographic fixing roller (1) is provided with multiple projections (13) continuously extending from the axial center O of the flexible layer to end parts L and R and symmetrical to the center O. Each projection (13) comprises a right conical surface S with a higher end adjacent to the center O and a lower end adjacent to the ends L and R. Namely, in the photographic fixing roller, the multiple right conical surfaces S are continuously arranged from the center O to the ends L and R with the center O as the symmetrical point. The projections (13) are defined in a way that the sum of the right conical step difference Ht in each right conical surface S is a necessary predetermined deviation preventing value for preventing heating wheel belts from deviating.

A representative configuration of a cleaning device and an image forming apparatus according to the present invention includes: a photosensitive drum which bears a toner image; a cleaning blade which abuts against the photosensitive drum and removes a toner remained in the photosensitive drum; a compression coil spring which is compressed to pressurize the cleaning blade against the photosensitive drum; and a positioning boss which is arranged to face the compression coil spring, with a predetermined gap being provided therebetween, allows a movement in a direction perpendicular to a compression direction of the compression coil spring, and regulates a movement of the compression coil spring such that the compression coil spring is not moved by more than a predetermined amount in the direction perpendicular to the compression direction of the compression coil spring.

A fluid control valve wherein a main valve body includes: a high-pressure passage providing communication between a suction port and a sleeve in which a spool is fitted; a tank passage providing communication between a discharge port and the sleeve; a lift lock poppet located between the sleeve and a cylinder port and assuming an open position for providing communication between the sleeve and the cylinder port; a hydraulic fluid discharge passage providing communication between a back-pressure chamber provided within the lift lock poppet and the sleeve; a hydraulic fluid delivery passage located between the sleeve and the lift lock poppet; a cylinder passage located between the lift lock poppet and the cylinder port that communicates with the hydraulic fluid delivery passage when the lift lock poppet is in the open position, and a communication passage providing communication between the hydraulic fluid discharge passage and the hydraulic fluid delivery passage.

A windshield wiper device includes: a wiper arm which has a recess, is swung according to the rotation of a wiper motor, and allows a wiper blade coupled to the leading end thereof to wipe clean the surface of a windshield; an acceleration sensor which is mounted in the recess of the wiper arm; a drive circuit which generates a voltage to be applied to the wiper motor; and a control circuit whichcontrols the drive circuit so that a voltage which decreases the change in the acceleration of the wiper arm detected by the acceleration sensor is applied to the wiper motor.

A stator includes an annular stator core, a stator coil and at least one protective wall. The stator core has a plurality of slots formed therein. The slots are spaced from one another in a circumferential direction of the stator core. The stator coil is comprised of a plurality of windings mounted on the stator core. The windings are connected in a predetermined manner to form a plurality of connection portions therebetween. The connection portions are located outside the slots of the stator core on one axial side of the stator core. The at least one protective wall is provided radially inside the connection portions of the stator coil so as to shield the connection portions from the radially inside of the stator.