Abstract: To provide a printer that can suppress self-jet generated by ejection of ink from a nozzle row and can improve printing quality. A printer includes an ink jet head 11 that ejects liquid from a nozzle row 14 being open in a liquid ejection surface 12 arranged on a surface facing a printing medium 3; a plasma actuator 20; and a controller 30 that controls the ink jet head 11 and the plasma actuator 20. When the nozzle row 14 ejects liquid to the printing medium 3, the controller 30 drives the plasma actuator 20 to generate an airflow between the liquid ejection surface 12 and the printing medium 3.

Abstract: A discharger is configured to discharge liquid in a liquid channel to outside the liquid channel. The liquid is at least one of first liquid and second liquid different from the first liquid. An agitator is configured to agitate the liquid in the liquid channel. When executed by a processor, instructions cause the processor to perform: an introducing process of, when the second liquid exists in the liquid channel, controlling the discharger to discharge the second liquid to outside the liquid channel and to introduce the first liquid from the tank into the liquid channel; an agitating process of, after the introducing process, controlling the agitator to agitate the liquid in the liquid channel; and a discharging process of, after the agitating process, controlling the discharger to discharge the liquid in the liquid channel agitated by the agitator to outside the liquid channel.

Abstract: A liquid ejecting unit includes a flow channel portion that includes a flow channel through which a liquid passes, a liquid ejecting head that is stacked on the flow channel portion in a first direction and ejects the liquid, which passes through the flow channel, from a nozzle, and a support body that supports the flow channel portion, and a concave portion that is recessed in the first direction and accommodates at least a portion of the flow channel portion is formed in the support body.

Abstract: An ink tank is used for an ink jet recording apparatus and includes an ink storage bag storing an ink, and the ink storage bag has no mechanism for allowing a side wall portion to shrink into a preliminary defined shape but has a side wall portion to shrink as the ink flows out. The ink tank has no mechanism for adjusting the pressure in the ink storage bag, the ink storage bag is made from a polyolefin resin, the ink is an aqueous ink containing a coloring material and a resin, and the resin contained in the ink has a glass transition temperature higher than the glass transition temperature of the polyolefin resin constituting the ink storage bag. An ink jet recording apparatus includes the ink tank and a recording head that eject an ink supplied from the ink tank by an ink jet method.

Abstract: An ink tank is used for an ink jet recording apparatus and includes an ink storage bag storing an ink, and the ink storage bag has no mechanism for allowing a side wall portion to shrink into a preliminary defined shape but has a side wall portion to shrink as the ink flows out. The ink tank has no mechanism for adjusting the pressure in the ink storage bag, the ink storage bag is made from a resin, the ink is an aqueous ink containing a coloring material and a water-soluble organic solvent, and the difference between the average SP of the water-soluble organic solvent and the SP of the resin constituting the ink storage bag is 2.0 (cal/cm3)1/2 or more. An ink jet recording apparatus includes the ink tank and a recording head that ejects an ink supplied from the ink tank by an ink jet method.

Abstract: In an example implementation, a print supply cartridge comprises a microcontroller to receive a timing challenge and enable authentication of the cartridge by providing a challenge response. The challenge response is provided in a challenge response time that falls within an expected time window.

Abstract: In one example in accordance with the present disclosure a liquid level sensing device is described. The device includes a carrier and a liquid level sensing device disposed on the carrier. The liquid level sensing interface has an aspect ratio of at least 1:50. A number of liquid level sensing components are disposed on the liquid level sensing interface. The number of liquid level sensing components detect a liquid level in a liquid container. The liquid level sensing device also includes an electrical interconnect to output data collected from the number of liquid level sensing components.

Abstract: An example printing cartridge includes a fluid container, a plurality of sensing locations in thermal contact with the fluid container, a voltage comparator to output time-based information based on a comparison of a sensed voltage generated at a selected sensing location of the plurality of sensing locations to a threshold voltage, the time-based information representative of whether a fluid is present at a fluid level associated with the selected sensing location, and a counter to convert the time-based information to a digital code based on a number of clock cycles.

Abstract: An example printing cartridge includes a sensing die including a plurality of sensing locations in thermal contact with a fluid container, an on-die controller to select a sensing location of the plurality of sensing locations to activate and to provide a variable threshold voltage, and a voltage comparator to compare a sensed voltage generated at a selected sensing location to the variable threshold voltage, and output time-based information based on the comparison, the time-based information representative of whether a fluid is present at a fluid level associated with the selected sensing location.

Abstract: Provided is a technique that can reduce at least one of various inconveniences in a sub-tank, such as stock management being complicated. The sub-tank includes: a consumable article containing portion; a sub-tank-side storage unit; and a case that can be detachably attached to multiple slots in a consumable article consumption apparatus and contains the consumable article containing portion. In a state before the sub-tank is first mounted in the slot, the sub-tank-side storage unit stores a sub-tank-side identifier configured to distinguish from another sub-tank, and in a state after the sub-tank is first mounted in the slot, the sub-tank-side storage unit further stores sub-tank-side consumable article information relating to an attribute of the consumable article replenished in a consumable article containing portion.

Abstract: A fluid ejection device may include a first channel having a first end and a second end, a first drop ejector along the first channel, a second channel having a first end and a second end, a second drop ejector along the second channel, a third channel extending between and connecting the first end of the first channel and the first end of the second channel, a fourth channel extending between and connecting the second end of the first channel and the second end of the second channel and a fifth channel extending between and connecting the third channel and the fourth channel.

Abstract: A fluid ejection device may include a series of spaced two-sided walls forming three channels therebetween. Each of the three channels may contain a drop ejector. The device may further include a fluid circulating element to circulate fluid across the drop ejector within each of the channels.

Abstract: A component: a chamber with an inlet; a passage connecting a lower portion of the chamber with an outlet; a vent connecting an upper portion of the chamber with the passage; and a barrier to block the vent forming a bubble trap, such that air bubbles from the chamber do not pass though the vent into the passage.

Abstract: An ink jet recording method, which uses an ink jet recording apparatus including: first and second inks corresponding to aqueous inks containing a pigment; a recording head in which a first ejection orifice array for ejecting the first ink and a second ejection orifice array for ejecting the second ink are sequentially arranged from the bottom in the direction of gravity to be adjacent to each other and the first and second ejection orifice arrays are arranged to at least partially overlap each other; and a cleaning member, includes: recording; and cleaning, wherein at least one of the first and second inks contains a resin, and a content of the resin in the second ink is larger than a content of the resin in the first ink.

Abstract: A ink jet recording method, which uses an ink jet recording apparatus including: first and second inks each containing a coloring material; and a recording head having an ejection orifice surface in which a first ejection orifice array for ejecting the first ink and a second ejection orifice array for ejecting the second ink are formed, the first and second ejection orifice arrays being sequentially arranged from the bottom in the direction of gravity to be adjacent to each other and at least partially overlap each other, includes recording, wherein at least one of the first and second inks contains a resin, and a content of the resin in the second ink is smaller than a content of the resin in the first ink.

Abstract: The ink jet recording method using an ink jet recording apparatus including: a first ink and a second ink; and a recording head including a plurality of recording element substrates in which a first ejection orifice array for ejecting the first ink and a second ejection orifice array for ejecting the second ink are sequentially arranged in a predetermined direction, wherein the plurality of recording element substrates are arranged to be adjacent to each other in a predetermined direction, includes: a recording step of ejecting the ink from the recording head disposed so that an angle formed between the ejection orifice surface of the recording head and the direction of gravity is 0° or more to less than 90° to record an image on the recording medium, wherein a brightness of the first ink is lower than a brightness of the second ink.

Abstract: The ink jet recording method, which uses an ink jet recording apparatus, including: a first ink and a second ink containing a pigment; and a recording head having an ejection orifice surface in which a first ejection orifice array for ejecting the first ink and a second ejection orifice array for ejecting the second ink are formed, wherein the first ejection orifice array and the second ejection orifice array are sequentially arranged from the bottom in the direction of gravity to be adjacent to each other and arranged to at least partially overlap each other, includes: a recording step, wherein a true specific gravity of the pigment in the first ink is smaller than a true specific gravity of the pigment in the second ink.

Abstract: A thermal head of the present disclosure includes a substrate, a heating part, an electrode, a protection layer, and a coating layer made of a resin material. The heating part is placed on or above the substrate. The electrode is placed on or above the substrate and connected to the heating part. The protection layer is placed on or above the heating part and the electrode. The coating layer is placed on or above the electrode and the protection layer. The protection layer includes a recessed part that is opened on an upper surface and that extends along a thickness direction of the protection layer. The recessed part includes an inner wall having a plurality of recesses and projections, and the resin material is disposed inside the recessed part.

Abstract: An optical scanning device includes a housing having first projecting bosses (46a) to (46d) and second projecting bosses (48a) to (48d) which are able to fix a first driving substrate (331) and a second driving substrate (332), respectively. The second projecting bosses (48a) to (48d) are arranged inward from the first projecting bosses (46a) to (46d) in a predetermined direction, the second substrate (332) is formed so as not to overlap the first projecting bosses (46a) to (46d) when viewed from a height direction of the second projecting bosses (48a) to (48d) in a state of being fixed to the second projecting bosses (48a) to (48d), and heights of the second projecting bosses (48a) to (48d) are lower than those of the first projecting bosses (46a) to (46d).

Abstract: The ink jet printer for the labelling of goods has a write head, which comprises a at least one outlet opening for ink droplets, b a printing mechanism connected to said outlet opening, c a pneumatic pump and d an electrical control. It has at least one supply tank for fluid flowing through the outlet opening. The supply tank is releasably connected to the write head in a coupling area. In the write head, a first pressure sensor is arranged at the compressed-air line, which detects the air pressure in the compressed-air line and outputs an air pressure signal to the controller. A second pressure sensor is arranged at the ink line, which detects the pressure in the ink line and outputs an ink printing signal to the controller. Said controller outputs a signal “ink empty”, if the ink printing signal declines by more than 10% in relation to the air pressure signal.

Abstract: There is provided an image forming method for forming an image on a recording medium which is fabric or recording paper by using an ink set including an ink and a treatment agent. In a case that the recording medium is the fabric, the image forming method includes: applying the treatment agent, which includes a cationic substance and a water-soluble organic solvent, to the fabric in an application amount of the treatment agent per an area of the fabric in a range of 4.7 mg/cm2 to 34 mg/cm2; drying the applied treatment agent and thereby reducing weight of the treatment agent in the fabric to be not more than 50% of the application amount of the treatment agent; and jetting the ink, which includes an anionic dye and a water-soluble organic solvent, onto the fabric by an ink-jet system.

Abstract: Rotary table digital printing machine for printing on work pieces, including at least one workstation attached to a holding frame, which is designed as a printing unit for printing on work pieces and includes a support frame for receiving an inking unit and a print head module, the support frame including a printing unit interface for coupling with a printing unit receptacle associated with the holding frame and further including a print head interface designed for coupling with a print head module, with a print head module and with an inking unit adapted to provide a printing ink to the print head module, a print head carrier having a carrier interface adapted to be coupled to the print head interface, wherein the printing unit receptacle, the printing unit interface, the inking unit, the print head interface, the carrier interface and the print head module form a row arrangement arranged along the printing direction.

Abstract: A heating apparatus includes an apparatus body, a receiver, a heating device, and a partition. The receiver holds a heating target so that the heating target is insertable into and removable from the apparatus body. The heating device is disposed above the receiver, to heat the heating target. The partition partitions an upper space above the heating device into a first space facing the heating device and a second space facing an upper surface portion of the apparatus body.

Abstract: To provide an ink jet recording method using facedown discharge and capable of obtaining a recorded matter being suppressed a generation of minus curl. The method provided is an ink jet recording method including a step of recording an image on a recording medium having a first surface and a second surface by ejecting an aqueous ink from a recording head. This method further includes, after the recording step, a step of discharging the recording medium while placing the first surface or the second surface on which the image has been recorded last on a gravitationally lower side. In this method, the aqueous ink has a viscosity rp of 5.0 mPa·s or more and a difference ?2??1 between a viscosity ?2 of an evaporated ink obtained by evaporating 20% by mass of the aqueous ink and the viscosity rp of the aqueous ink is 4.0 mPa·s or more.

Abstract: A printer includes a first holding shaft holding side pinch rollers and at least one center pinch roller, grit rollers moving a recording medium while holding the recording medium together with the side pinch rollers and together with the center pinch roller, and a rotator rotating the first holding shaft to cause the side pinch rollers and the center pinch roller to approach, or to be separated from, the grit rollers. The center pinch roller is movable in a direction to be separated from the recording medium, independently from the side pinch rollers.

Abstract: Provided is an unwinding device for unwinding a sheet from a sheet roll, the sheet roll being inserted onto the device. The unwinding device includes a shaft, a first rotating member and a second rotating member which are inserted onto the shaft, configured to be rotatable with rotation of the sheet roll, the sheet roll being inserted onto the first rotating member and the second rotating member, a first elastic member disposed between the first rotating member and the shaft, the first elastic member being configured to provide first back tension to the sheet when the first rotating member rotates, a second elastic member disposed between the second rotating member and the shaft, the second elastic member being configured to provide second back tension to the sheet when the second rotating member rotates, and a back tension controlling member disposed between the second elastic member and the shaft.

Abstract: An image forming apparatus includes a reception unit that receives an instruction to place and print an image in an area of a specific shape having an aspect ratio different from an aspect ratio of a recording sheet; a print control unit performs control such that a support image is on the recording sheet, the support image supporting specification of a cut position to cut out the area of the specific shape, in which the image of which printing instruction is received by the reception unit is printed, from the recording sheet; and an output unit outputs an explanatory image that explains the cut position with respect to the support image, in a case where the reception unit receives the printing instruction.

Abstract: An image forming method includes applying an ink for the first time to a recording medium to form an image and rolling up the recording medium in a roll form, wherein the recording medium is continuous paper, the ink includes an organic solvent and a coloring material, and the image recorded matter has a tackiness power of from 80 to 110 nN.

Abstract: A drying apparatus usable with a printing system includes a housing, a first set of radiative heating elements, a second set of radiative heating elements, and an air handling device. The housing includes a front region and a rear region adjacent to the front region. The front region includes an inlet to receive media. The rear region includes an outlet to pass media there through. The first set of radiative heating elements is disposed within the front region to heat the media. The second set of radiative heating elements is disposed within the rear region to heat the media. The air handling device is disposed across from the second set of radiative heating elements to jet air within the rear region to cool the media prior to the media being passed through the outlet.

Abstract: An aqueous ink for inkjet printing contains silver particles having a particle size of 60 nm or less at a cumulative volume of 90%.

Abstract: Provided is a manufacturing method for a printed matter including a medium and a three-dimensional pattern printed on a surface of the medium. The three-dimensional pattern has a partly-coated resin portion and further has layers including a colored layer and clear layers formed on the colored layer. The three-dimensional pattern is formed by stacking the layers formed of inks at least containing resin on one another. One of the clear layers formed on an outermost surface of the three-dimensional pattern is flattened for a longer duration than at least one of the other one of the clear layers and the colored layer that are formed below the clear layer on the outermost surface, so that the one of the clear layers on the outermost surface is further flattened than at least one of the other one of the clear layers and the colored layer.

Abstract: Systems and method provide a reveal substrate having a) an opaque polymer sensitive to at least one first application of at least one selected from heat, pressure and light, said opaque polymer becoming transparent upon being subjected to the at least one first application, and b) a bottom substrate layer having one or more colored areas on a top surface thereof, said bottom substrate layer being disposed such that the one or more colored areas are obscured by the opaque polymer prior to being subjected to the at least one first application and are revealed after at least one portion of the opaque polymer is subjected to the at least one first application.

Abstract: A thermal transfer apparatus includes a fixture, a foil securing film, a film retainer, a foil transfer tool, and a carriage conveyor. The fixture retains a transfer object. The foil securing film is disposed above the fixture. The foil securing film allows light to pass therethrough. The foil securing film presses, from above, a thermal transfer foil on the transfer object so as to secure the thermal transfer foil onto the transfer object. The film retainer retains the foil securing film. The film retainer moves the foil securing film in an up-down direction relative to the fixture. The foil transfer tool presses the foil securing film and the thermal transfer foil on the transfer object. The foil transfer tool emits light to the foil securing film. The carriage conveyor moves the foil transfer tool relative to the fixture.

Abstract: A printing plate includes a plurality of relief areas which stand proud of a floor of the plate, each of the relief areas having an uppermost surface to which, in use, is applied a liquid which is borne by the uppermost surface and subsequently contactingly transferred to a substrate material. A predetermined pattern of depressions define a corresponding pattern of islands within the uppermost surface. The depressions within the uppermost surface include at least primary depressions of a first size and substantially geometric first cross-sectional shape, and secondary depressions, being of smaller cross-sectional area than the primary depressions and having a second cross-sectional shape which is distinctly more elongate than the first cross-sectional shape.

Abstract: A mechanism that makes it possible to output a saddle-stitched brochure in a correct page order when a post-processing apparatus that executes a saddle-stitching process by switching back a sheet is caused to execute the saddle-stitching process. Sheets discharged from a printing apparatus are switched back by reverse rotation of a conveying roller pair, and are conveyed into a conveying path for a saddle-stitch bookbinding process. The sheets are accumulated in an accumulation tray for the saddle-stitch bookbinding process. When the saddle-stitch bookbinding process is caused to be executed on the accumulated sheets by the post-processing apparatus, the order of image formation is decided such that the order of pages of images printed on the saddle-stitched sheets becomes correct. The images are printed on the sheets in the decided order of image formation.

Abstract: An optically variable device comprising a substrate having a transparent viewing region and a layer of optical interference structure material for selectively reflecting and transmitting incident light to generate an optically variable effect. The layer of optical interference structure material has a front side and a rear side, the device further comprising an absorbing layer comprising an at least partially light absorbing material on the rear side of the layer of optical interference structure material. When a region on the front side of the layer of optical interference structure material receives incident light and the device is viewed in reflected light, the absorbing layer is sufficiently opaque to absorb light that passes through the optical interference structure material and the optically variable effect is observable in reflected light.

Abstract: A new concept of bi-luminescent security pigments includes lanthanide doped rare-earth compound with rare-earth free compound and its ink formulation. The unique features of this bi-luminescent security ink is that it emits two different colors when it is illuminated by using two different excitation wavelengths. This important feature makes it most suitable for printing of security codes or QR codes/security images on currency, important official documents, food and medicinal packaging etc. The prospective use of this bi-luminescent security ink provides a ground-breaking opening for easily printable, highly stable and unclonable bi-luminescent security codes for anti-counterfeiting applications.

Abstract: A 3D pen capable of feeding out drawing materials of different colors simultaneously is provided having a shell, a control mechanism, several transmission mechanisms, several feeding mechanisms, and a nozzle; the shell and the control mechanism are connected with each other; the control mechanism comprises a micro-processor unit (MCU); the MCU is electrically connected with the transmission mechanisms; the transmission mechanisms are connected with the feeding mechanisms; the feeding mechanisms are connected with the nozzle. The nozzle has several feeding channels extending along a left end and a right end of the nozzle.

Abstract: A writing instrument includes a barrel and a cap capable of being assembled with and secured to the barrel. The barrel carries a writing instrument. The cap carries a clip. A free end of the clip includes a detent that can be received by a corresponding indentation of an exterior surface of an external portion of the barrel when the cap is assembled with the barrel. The detent of the clip and the indentation of the barrel are capable of securing the cap and the barrel in their assembled relationship. The writing instrument may be compact. Methods of using a writing instrument include securing a cap of the writing instrument to a barrel of the writing instrument by causing a detent of a free end of a clip of the cap to engage a corresponding indentation of an exterior portion of the barrel.

Abstract: Embodiments of the disclosure set forth an embosser for a die. The embosser includes a frame having two sides. The embosser includes a handle and a roller body. The roller body includes a first roller in contact with the die and a second roller. In response to the handle being moved toward the roller body to a first handle position, the first roller is moved toward a first edge of the die and the second roller is in contact with the die. In response to the handle being moved toward the roller body to a second handle position from the first handle position, the first roller and the second roller remain in contact with the die and further press the die.

Abstract: The present disclosure provides a metal article having decorative graph-text. The metal article comprises includes a metal substrate having micropores on the surface, thermal sublimation ink filled in a portion of the micropores, and a pore-sealing layer located on the surface of the metal substrate. The present disclosure also provides a preparation method for a metal article having decorative graph-text.

Abstract: A fastening arrangement for a rim of a wheel on a wheel hub of a wheel carrier of a motor vehicle. The fastening arrangement includes a central screw which, on a fastening portion, has an external thread which engages in an internal thread of a step of the wheel hub. A tensioner produces a force-fitting connection between the wheel hub step and the central screw. A locking arrangement prevents unintentional release of the central screw. The locking arrangement has a carrier member and a blocking member, wherein the blocking member is pretensioned in relation to the carrier member by a locking spring member and is displaceable in the axial direction. The blocking member is arranged captively in the carrier member via securing means.

Abstract: A wheel includes a rim that is at least partially made from a fiber reinforced plastic. The rim has an inner side directed to the hub region of the wheel and an outer side directed centrifugally away from the hub region of the wheel whereby the outer side comprises a well which is interconnected with an outer shoulder by a transition area. A wheel center is interconnected with the inner side of the rim by means of at least one fastening means wherein the at least one fastening means penetrates the rim via at least one opening that extends from the inner side of the rim to the outer side of the rim. At least one annular cover means is arranged at the outer side of the rim in circumferential direction around the wheel and thereby covers the at least one fastening means and/or the at least one opening.

Abstract: An auxiliary air chamber member includes connecting portions recessed into an auxiliary air chamber from an upper surface portion and a lower surface portion to partially connect the upper surface portion and the lower surface portion. A non-connecting portion of the lower surface portion excluding the connecting portions is a curved surface corresponding to a shape of an outer peripheral surface of a well portion. The connecting portions are arranged separated equally in a wheel circumferential direction and include a first connecting portion on one side and a second connecting portion on the other side arranged in parallel in a wheel width direction. One of the connecting portions is disposed at a position in an offset plus direction and the other is disposed at a position in an offset minus direction with reference to a cross-sectional center of gravity in the wheel width direction.

Abstract: A hub unit bearing includes a stationary side raceway ring, a rotating side raceway ring including a rotating side flange for fixing a vehicle wheel, and rolling elements rollably provided therebetween. The rotating side flange includes thin portions and thick portions arranged alternately in a circumferential direction. A hub bolt is serration-fitted to a bolt hole formed in each of the thick portions. An outer peripheral surface of the rotating side flange includes a large-diameter portion which has a larger radial thickness dimension with the bolt hole, a small-diameter portion which has a smaller radial thickness dimension with the bolt hole than the large-diameter portion, and a step portion which connects the large-diameter portion to the small-diameter portion. A serration-fitted portion does not radially overlap with the large-diameter portion.

Abstract: A quick-release device includes a tube having multiple holes defined through the wall in the first end thereof, and a seat is connected to the second end of the tube. A sleeve is located in the first end of the tube. Multiple stop members are located in the tube and movably engaged with the holes respectively. Each stop member has an inclined face defined in the underside thereof A lever includes a cam portion pivotably mounted to the first end of an axle which extends through the tube. An end member is movably connected to the first end of the tube and is secured to the second end of the axle. When pivoting the lever, the end member is moved toward the seat or moved away from the seat to be the secure status or the release status.

Abstract: A cap configured to be connected to a wheel having a hub and a series of openings configured to receive fasteners attaching the wheel to a vehicle. The cap includes a disc defining a series of openings. The number of openings in the cap is less than the number of openings in the wheel. Each opening in the cap is configured to align with a corresponding opening in the wheel. Additionally, the cap is configured to conceal a remainder of the openings in the wheel that are not aligned with the openings in the cap.

Abstract: Provided is a tire that is lightweight and excellent in riding characteristics while suppressing an increase in cost. A plurality of belt layers 7 are superimposed in a radial direction. The belt layers 7 include a plurality of steel cords 10 arranged in parallel in a row and rubber 11. The steel cords 10 have a 1×4 structure in which four filaments 20 are twisted, and when a center-to-center distance between the steel cords 10 in at least two of the belt layers 7 adjacent in the radial direction is T, and an average diameter of virtual circumscribed circles of the steel cords 10 having the 1×4 structure is D, 1.25?T/D?2.25.

Abstract: A heavy duty pneumatic tire comprises a tread pattern that comprises: circumferential main grooves with a wave-like shape, shoulder lug grooves extending in the tire width direction to a ground contact edge and connecting to the circumferential main grooves at first groove turning portions that protrude outward; center lug grooves connecting to the circumferential main grooves at second groove turning portions that protrude inward; and center blocks defined by adjacent center lug grooves of the center lug grooves adjacent in the tire circumferential direction and the circumferential main grooves, forming a row in the tire circumferential direction. The center lug grooves and the circumferential main grooves have a narrower groove width than the shoulder lug grooves; and each region of the center blocks includes two first narrow grooves having a curved line shape with no bent portions and having a narrower groove width than the shoulder lug grooves.

Abstract: A tread pattern of a heavy duty pneumatic tire includes: a linear shaped center lug groove; a pair of circumferential main grooves formed in a wave shape in a tire circumferential direction; a center block; and a central narrow groove that does not have a linear shape, having an opening end that opens in the adjacent center lug grooves in a tire lateral direction position excluding on a tire equator line, and having a groove width that is narrower than the groove width of the shoulder lug groove. The groove width of the center lug groove and the circumferential main groove is narrower than the groove width of the shoulder lug groove. The central narrow groove has a portion that extends outwards in a tire lateral direction from the opening end in the half tread region where the opening end is positioned.