Abstract: A multilayer structure is provided, which includes a layer containing a saponified ethylene-vinyl ester copolymer, and a layer of a thermoplastic resin other than the saponified ethylene-vinyl ester copolymer provided on at least one side of the saponified ethylene-vinyl ester copolymer-containing layer with the intervention of an adhesive resin layer. An interface layer having a thickness (X) of 50 to 400 nm is present in an interface between the saponified ethylene-vinyl ester copolymer-containing layer and the adhesive resin layer. Alternatively, a viscosity increase rate in the interface between the saponified ethylene-vinyl ester copolymer-containing layer and the adhesive resin layer is 0.1% to 8%. Therefore, the multilayer structure has long-run durability, and is less liable to have poor appearance even if being produced by a multilayer coextrusion method.

Abstract: An adhesive sheet includes: a carbon nanotube sheet including a plurality of carbon nanotubes aligned preferentially in one direction within a plane of the sheet; and an adhesive agent layer including an adhesive agent, in which a rupture elongation of the adhesive sheet is 10% or more.

Abstract: A substrate and method for providing a thermoplastic composite having a fiberglass mat embedded within a thermoplastic polymer. The characteristics of the fiberglass mat combined with a thermal compression bonding method allow for a substantially improved and desirable thermal expansion coefficient over conventionally filled thermoplastic substrates or other fiberglass reinforced thermoplastics.

Abstract: An emulsion composition according to the present invention includes: a polymerizable compound comprising two or more (meth)acryloyl groups; a surfactant; and a dispersion medium including water as a principal component, in which an oil droplet diameter D90 corresponding to a diameter at cumulative 90% by volume in the oil droplet size distribution of oil droplets comprising the polymerizable compound and the surfactant, measured according to a laser diffraction and scattering measurement process is less than 1.8 ?m. A maximum oil droplet diameter Dmax of the oil droplets, measured according to the laser diffraction and scattering measurement process is preferably less than 4.0 ?m. A content of the polymerizable compound in the composition with respect to 100 parts by mass of a total of components other than the dispersion medium is preferably no less than 40 parts by mass. The oil droplets may further comprise an inorganic particle.

Abstract: Disclosed is a laminate for automotive interior material which includes a vinyl chloride resin layer and a tape, where no mark appears at a portion where the tape is laminated even when the laminate is lined with a foamed polyurethane layer and heated. The disclosed laminate for automotive interior material includes a vinyl chloride resin layer and a tape disposed on one side in a thickness direction of the vinyl chloride resin layer, wherein the tape includes a substrate having a porous structure and an adhesive layer, and wherein the adhesive layer is positioned closer to the vinyl chloride resin layer than the substrate.

Abstract: The present invention provides a sheet, wherein the sheet has an excellent low-gloss feeling; even when oblique light is incident on a surface of the sheet, diffuse reflection of the light is suppressed, the surface is less likely to look white when viewed obliquely, and a design represented on the sheet can be visually recognized; and the sheet has excellent designability. In the sheet, a surface of the sheet has an arithmetic average roughness Ra (JIS B0633: 2001) of 0.7 ?m or less, and the reflectance at a detection angle equal to a regular reflection angle ±5°, measured by a variable angle photometer when the surface is irradiated with incident light at an incident angle of 75°, is 50% or less of the reflectance at the regular reflection angle.

Abstract: Disclosed are multilayer films which can provide desired mechanical performance suited for flexible packaging applications.

Abstract: The present invention relates to articles such as plastic closures molded from polymeric materials the like having a hydro-graphic film applied thereto for enhancing aesthetic appeal. The present invention further relates to techniques for applying a coating to articles, such as plastic closures, with a hydro-graphic film ink, which method contemplates application of the ink to the articles in a water bath without first drying the ink, thereby maintaining the ink in fluid state, desirably avoiding the time-consuming and sometimes problematic steps of drying and reactivating the hydro-graphic film ink.

Abstract: An apparatus includes a control device for a first suction portion, a second suction portion, and a folding portion so that each time a separator is folded, a positive electrode and a negative electrode are alternately sandwiched between folded surfaces of the separator. The control device controls the at least one of the first suction portion and the second suction portion so that doping foil is bonded to one of a current collector, the positive electrode, and the negative electrode sucked and held by the at least one of the first suction portion and the second suction portion. The control device controls the at least one of the first suction portion and the second suction portion so that the one of the current collector, the positive electrode, and the negative electrode having the lithium metal foil bonded thereto is transported and sandwiched between a predetermined pair of the folded surfaces of the separator.

Abstract: A bi-laminate polymer coated metal substrate, vehicle trim member formed therefrom, and method of manufacture thereof are provided. The bi-laminate polymer coated metal substrate includes a monolithic metal substrate having a first area with a first polymeric material bonded thereto and a second area, different from the first area, with a second polymeric material bonded thereto. A substantially tear resistant, protective substrate is releasably bonded to the first polymeric material, with the first polymeric material being sandwiched between the protective substrate and the metal substrate. The protective substrate is selectively removable from the first polymeric material to expose the first polymeric material as a finish surface.

Abstract: This disclosure relates to an article that includes a nonwoven substrate, a first film supported by the nonwoven substrate, and a second film such that the first film is between the nonwoven substrate and the second film. The first film includes a first polymer and a pore-forming filler. The difference between a surface energy of the first film and a surface energy of the nonwoven substrate is at most about 10 mN/m. The second film includes a second polymer capable of absorbing and desorbing moisture and providing a barrier to aqueous fluids.

Abstract: A method for operating a vacuum jig may include emitting an ultraviolet light from an ultraviolet light source; detecting, using an ultraviolet light sensor, luminescence of a coating on a surface responsive to emission of the ultraviolet light; determining whether the detected luminescence is greater than or equal to a predetermined threshold luminescence; and enabling a vacuum-assisted coupling of the vacuum jig when the detected luminescence is greater than or equal to the predetermined threshold luminescence. Vacuum jigs including ultraviolet light sensors are also described.

Abstract: A method of forming a three-dimensional printed object having a printed surface image includes ejecting drops of a build material to form the three-dimensional printed object with a plurality of layers of build material and at least one layer of a transparent material. The method operates ejectors to form a printed image with a marking agent so the printed image can be viewed through the at least one transparent layer. A leveler is applied to a surface of the layer of transparent material but not to the printed image.

Abstract: A three-dimensional-object forming apparatus includes a platform that includes a support surface for a three-dimensional object. An extrusion head is movable relative to the platform in main scanning and sub-scanning directions to extrude a build material to the support surface. A measurer measures an environment temperature around the object on the support surface. A controller includes a storage and a processing unit. The storage stores data of a forming condition in correlation with the environment temperature. The forming condition specifies a condition for a forming operation to form the object. The processing unit causes the platform and the extrusion head to perform the forming operation, updates the forming condition during the forming operation based on the measured environment temperature and the data stored in the storage, and causes the platform and the extrusion head to perform the forming operation under the updated forming condition.

Abstract: The present invention provides a planographic printing plate original including, in the order mentioned below: a substrate; and at least a heat sensitive layer and a silicone rubber layer provided on the substrate, wherein the heat sensitive layer contains a polyurethane having a carbonate structure. The present invention also provides a method of producing a planographic printing plate using the same, and a method of producing a printed matter. An object of the present invention is to provide: a planographic printing plate original which has an excellent halftone dot reproducibility and printing durability, and in which the occurrence of scumming can be prevented; a method of producing a planographic printing plate using the same; and a method of producing a printed matter.

Abstract: A dryer device for a printing press that prints in at least one printing position on a printing substrate by use of at least one printing unit, in particular a printing press for securities, includes a dryer with a drying unit formed by an array of a plurality of adjacent radiation sources. That array extends at least over the maximum width of the printing substrate and is used to supply radiation to the printing substrate in each activated state for drying the latter. A control device allows the radiation sources or some of the radiation sources to be switched on or off in a repeating cycle that comprises a sequence with at least one active and at least one inactive phase in correlation with one of a press and a printing-substrate phase position. The dryer device comprising the dryer and the control device is configured to switch on and switch off, for each cycle, only some of the radiation sources in some sections in at least four pre-definable radiation-source groups, spaced approximately equidistantly, i.

Abstract: A method for forming a three-dimensional object by extruding ink droplets from ink-jet heads includes forming an inner build region of the object. A colored region is formed outside of the inner build region so as to color the object. A support region is formed outside of the colored region so as to support the object while the object is being formed. An intermediate region is formed between the inner build region and the colored region. The intermediate region is formed in such a manner that affinity between the intermediate region and the inner build region and affinity between the intermediate region and the colored region are higher than affinity between the colored region and the support region.

Abstract: An inkjet printing apparatus uses a printing head including a plurality of nozzle arrays each including a plurality of nozzles arrayed in a first direction, the nozzle arrays being arranged in a second direction. A compensating unit compensates for an ejection failure of a defective nozzle by causing a compensating nozzle to eject ink to a predetermined pixel area in a case where the print data corresponding to the defective nozzle indicates ink ejection to the predetermined pixel area. The compensating unit determines the compensating nozzle such that the compensating nozzle satisfies both a first condition that the compensating nozzle is not a defective nozzle and a second condition that the print data indicates that nozzles belonging to the nozzle array including the compensating nozzle do not eject ink to a pixel area corresponding to N pixels (N is a positive integer) around the predetermined pixel area in the first direction.

Abstract: A pixel row in an arrangement direction or an orthogonal direction is divided into processing groups including pixels at every predetermined pixel count in the pixel row. Nondischarge complementary processing is sequentially performed on the divided plurality of processing groups.

Abstract: A method is provided that is implemented on a control device connected with an inkjet printer, which includes an inkjet head having an ink discharging surface, a head scanning unit reciprocating the inkjet head relative to a recording sheet along a scanning direction parallel to the ink discharging surface, and a wave shape generating mechanism deforming the recording sheet in a predetermined wave shape that has tops of portions protruding in a first direction toward the ink discharging surface and bottoms of portions recessed in a second direction opposite to the first direction alternately arranged along the scanning direction, the method including acquiring gap information related to a gap between the ink discharging surface and each individual one of the tops and the bottoms on the recording sheet, and determining whether the gap information acquired for each individual one of the tops and the bottoms is abnormal.

Abstract: A transfer data generator creates transfer data that suppresses an increase in radiation noise generated when the transfer data is transferred to an ink head. The transfer data generator creates transfer data including transfer printing image data to be transferred to the ink head, and a transfer clock signal. The transfer data generator includes a clock signal creation processor that generates a pulse period of at least one pulse of a plurality of pulses of the reference clock signal different from each of pulse periods of the other pulses to generate the transfer clock signal from the reference clock signal, and a printing image data creation processor that adjusts the reference printing image data so as to correspond to the transfer clock signal to generate transfer printing image data.

Abstract: The printing apparatus is provided with a transport mechanism section that transports work, a printing mechanism section that has nozzles, which carry out printing by discharging an ink, as liquid droplets, onto the work transported by the transport mechanism section, and an adjustment section that adjusts a volume per single droplet of the ink discharged from the nozzles on the basis of a separation distance between the nozzles and the work, which is positioned directly below the nozzles.

Abstract: An inkjet printhead device, fluid ejection device and method thereof are disclosed. The fluid ejection device includes a fluid supply chamber to store fluid, an ejection chamber including a nozzle and a corresponding ejection member to selectively eject the fluid through the nozzle, and a channel to establish fluid communication between the fluid supply chamber and the ejection chamber. The fluid ejection device also includes a pressure sensor unit having a sensor plate to output a voltage value corresponding to a cross-sectional area of an amount of fluid in the at least ejection chamber.

Abstract: Provided in one example is an apparatus, including a substrate supporting a microfluidic channel, a bubble jet inertial pump supported by the substrate adjacent the microfluidic channel to pump fluid through the microfluidic channel and an optical sensor on a first side of the microfluidic channel. A light emitter on a second side of the microfluidic channel is to pass light across the microfluidic channel to the optical sensor.

Abstract: Provided is a liquid ejection head comprising: an ejection opening row along a first direction; a pressure chamber with print-element; a passage communicating with the pressure chamber; a supply opening row along the first direction with supply openings extending in a second direction to supply liquid to the passage; a collection opening row along the first direction with collection openings extending in the second direction to collect a liquid from the passage; a first common supply passage along the first direction to supply a liquid to the supply opening row; a first common collection passage along the first direction to collect a liquid from the collection opening row; a first supply side communication opening extending in the second direction to supply a liquid to the first common supply passage; and a first collection side communication opening extending in the second direction to collect a liquid from the first common collection passage, wherein at least one of the first supply side communication openi

Abstract: A method for manufacturing a liquid ejection head including providing a negative first photosensitive resin layer on the substrate, forming a pattern of the flow path by selectively exposing the first photosensitive resin layer, providing a negative second photosensitive resin layer on the first photosensitive resin layer, providing a negative third photosensitive resin layer on the second photosensitive resin layer, forming a pattern of the ejection port by selectively exposing the second and third photosensitive resin layers, developing the first, second, and third photosensitive resin layers, irradiating an activation energy line on at least the third photosensitive resin layer after the developing, and heat curing the first, second, and third photosensitive resin layers after the irradiating of the activation energy line.

Abstract: A liquid discharge apparatus includes a plurality of pressure chambers that generate a pressure for discharging a liquid, a plurality of nozzles that communicate individually with the pressure chambers and that discharge the liquid, a common liquid chamber that includes a plurality of supply openings and that has, at an end portion side in an arrangement direction of the supply openings, a region in which flow speed of the liquid flowing toward the supply openings is higher than in another region, and a controller that controls a maintenance by expelling the liquid from the nozzles. During the maintenance, the controller controls expelling the liquid from a first nozzle to a second nozzle that is one of nozzles located on the end portion side of the first nozzle in the arrangement direction of the supply openings, in an order of the first nozzle to the second nozzle.

Abstract: A liquid ejecting apparatus includes: a liquid ejecting unit that ejects, to a target, a liquid which is supplied from a liquid supply source via a liquid supply channel; a carriage on which the liquid ejecting unit is mounted and which moves with respect to the target; a gas containing chamber mounted on the carriage; and a pump that is disposed outside the carriage of the liquid ejecting apparatus and sends gas out to one system of a gas channel connected to the gas containing chamber and suctions gas from the gas channel.

Abstract: A cartridge includes a concave portion. The concave portion has an opening, first and second side walls, and a bottom wall, and the bottom wall has a tilted surface tilted. The tilted surface is provided with a cartridge side terminal group. The first side wall is provided with a first restriction portion which restricts movements in a +Z axis direction and a +X axis direction of an apparatus side terminal unit, and the second side wall is provided with a second restriction portion which restricts movements in the +Z axis direction and a ?X axis direction of an apparatus side terminal unit.

Abstract: There is provided a liquid supply device that supplies liquid to a liquid ejecting portion which ejects liquid from a nozzle, the liquid supply device including a holding portion that holds, so as to be attachable and detachable, a liquid accommodating body that accommodates the liquid, and a rotation mechanism that rotates the holding portion between an attachment and detachment position at which the liquid accommodating body is attached and detached and a supply position at which the liquid is supplied to the liquid ejecting portion, in which the liquid accommodating body that is held in the holding portion at the supply position is disposed at a higher position than the nozzle.

Abstract: A container on which a liquid container provided with a handle is removably placed, in which the container includes a plurality of guide portions configured to guide guided portions provided in the liquid container in a guiding direction, and the plurality of guide portions are provided so that at least a part of the handle is disposed on a line which connects the at least two guide portions in a state where the liquid container is placed on the container.

Abstract: The liquid container is detachable from a case of a liquid ejection apparatus. The liquid container has a bag-shaped member that is flexible and has a storage portion for storing a liquid therein, and a connection member attached to the bag-shaped member. The connection member has a liquid introducing outlet into which a liquid introducing portion of the liquid ejection apparatus is inserted, a container-side electrical connection unit to which an apparatus-side electrical connection unit of the liquid ejection apparatus is connected, and a handle that pivots with respect to the connection member. In a state where the liquid container is arranged in the case, the handle is provided at a position exposed to the outside of the case, and when the liquid container is mounted to/removed from the case, the handle is brought into a second orientation in which the handle is pivoted from a first orientation.

Abstract: A technique is provided with which the concentration in liquid to be supplied to a liquid ejection apparatus is less likely to be uneven. A liquid container for supplying a liquid having a precipitating component to a liquid ejection apparatus includes: a liquid container, a liquid leading portion for leading the liquid in the liquid containing portion to the liquid ejection apparatus; a liquid flow tube that has a base end connected to the liquid leading portion, the liquid flow tube extending within the liquid containing portion from the liquid leading portion toward the second end; and a spacer member that is provided in the liquid containing portion and has a spacer body forming a liquid-retaining space for retaining the liquid in the liquid containing portion. The spacer member is coupled to the liquid leading portion. The liquid flow tube is coupled to the spacer member.

Abstract: A printing fluid cartridge includes at least one electrical interface configured to be electrically connected to at least one contact, and a light attenuating portion configured to attenuate light.

Abstract: There is provided a liquid ejecting apparatus including a liquid ejecting portion that has a nozzle and performs a recording process by ejecting liquid from the nozzle toward a medium, a supply flow path that is provided so as to allow the liquid that is accommodated in a liquid accommodating body to flow toward the liquid ejecting portion, and a pressure feeding mechanism that forcefully causes the liquid to flow from the liquid accommodating body toward the liquid ejecting portion, and an accommodating body holding portion that is capable of having the liquid accommodating body mounted thereon and is disposed at a supply position at which it is possible to supply the liquid to the liquid ejecting portion using a water head with respect to the nozzle of the liquid that is accommodated in the mounted liquid accommodating body.

Abstract: There is provided a printing apparatus (liquid droplet discharge apparatus) including a discharge portion that has a nozzle surface to which a nozzle that discharges ink on a medium is open, a reflecting mirror that reflects light, an imaging portion that images the reflecting mirror, a wiping portion that wipes the nozzle surface, and a movement mechanism that moves at least one out of the discharge portion, the reflecting mirror, and the imaging portion so as to switch a state of the nozzle between a state in which the nozzle surface faces the medium and a state in which the nozzle surface faces the imaging portion via the reflecting mirror.

Abstract: An image processing apparatus in an embodiment is an image processing apparatus for forming structures on a print medium, the structures being configured to express such a characteristic that sparkle points change in position with change in angle of observation. The image processing apparatus in this embodiment includes a generation unit configured to generate arrangement data based on information on a characteristic of sparkle points, the arrangement data specifying arrangement of the structures of two or more types that are capable of being formed on the print medium and at least include one or more first structure associated with a first inclination angle and one or more second structures associated with a second inclination angle different from the first inclination angle.

Abstract: Optimization of ink recipes for spot colors in printers. Often, ICC Profiles are optimized for smooth rendering of images; thus, color recipes often contain more inks than are required for matching a color when generated from a Profile. When transitioning from one color to another, it is better to make smaller changes in inkings. This goal is not served when printing spot colors. Spot colors are often single, solid colors that do not vary in gradients from one to another. Herein is a discussion including dividing an N-ink set into subsets, generating an ink recipe for a desired recipe in each ink subset, and selecting a subset based on predetermined criteria. Where a spot color is out of Gamut, that color is mapped to the Gamut.

Abstract: An object printing system facilitates the printing of articles of manufacture. The system includes at least one printhead, a transfer device, an ultraviolet (UV) radiator, a pressurized gas source operatively connected to the transfer device, a plurality of actuators, and a controller. The controller is configured to operate the at least one printhead to form an image on a substrate, move the substrate bearing the image past the UV radiator as the controller operates the UV radiator to cure the ejected marking material partially to prevent ink movement, and operates the pressurized gas source to conform the substrate and partially cured ejected material to a shape corresponding to a surface of an object placed on the substrate to transfer the partially cured marking material onto the surface of the object. The transfer device can be an inflatable bladder or a molded vacuum chamber.

Abstract: A label printer according to an embodiment includes a support unit that supports a roll of a backless label paper; a conveying unit that conveys and reverse conveys the backless label paper along a conveying path; a printing unit positioned on the conveying path and including a print head that prints on a surface of the backless label paper; a cutting unit, positioned on the conveying path downstream of the printing unit in a conveying direction, that cuts the backless label paper; and a control unit that controls the conveying unit to reverse convey the backless label paper in a reverse conveying direction after the cutting unit cuts the backless label paper sheet so that a tip of the backless label paper is stopped at a predetermined position downstream from the print head in the conveying direction.

Abstract: A recording apparatus includes a light irradiation unit configured to emit light for curing photocurable ink to a recording medium, and a head having a nozzle formation surface in which nozzles for discharging the photocurable ink onto the recording medium are formed. A retroreflection surface is provided on at least a part of a light arrival region at which the light emitted from the light irradiation unit arrives.

Abstract: A liquid ejecting apparatus includes (A) a carriage that moves a nozzle ejecting a liquid which is cured by irradiation of an electromagnetic wave in a moving direction, (B) a first irradiation section that is installed on the carriage and irradiates electromagnetic waves on dots formed by landing the liquid which is ejected from the moving nozzle, on a medium, and (C) a second irradiation section that is installed on the carriage and irradiates electromagnetic waves on the dots which are irradiated by the electromagnetic waves from the first irradiation section, in which an irradiance level of the electromagnetic waves from the second irradiation section is different from that of the electromagnetic waves from the first irradiation section.

Abstract: A printer according to an embodiment includes: a printer body including a supplying part that rotatably holds a roll-shaped sheet member; an opening and closing cover configured to open and close with respect to the printer body; a thermal head disposed on the printer body, the thermal head configured to print on the sheet member; a platen roller disposed on the opening and closing cover, the platen roller positioned at a location opposite to the thermal head and feeding the sheet member in a closed configuration; and a platen roller holding mechanism configured to attachably and detachably secure the platen roller to the opening and closing cover. The platen roller holding mechanism includes a label roll supporter that rotatably guides the roll-shaped sheet member in the supplying part. The label roll supporter includes a cross-sectional arc-shaped surface.

Abstract: If the first print medium is a print medium to be used for single-sided printing and a re-conveyed print medium is not located within a predetermined distance from a region where the first print medium is located on a conveyance path, control is performed so that an interval between the region where the first print medium is located on the conveyance path and a region where the second print medium is located on the conveyance path becomes the second interval shorter than the first interval.

Abstract: A target transport apparatus includes a transport roller pair that has a plurality of segmented roller members disposed at intervals in a width direction that intersects with a transport direction of continuous paper and that imparts a transport force on the continuous paper by the segmented roller members pinching the continuous paper; and an image capturing unit, disposed in a location that corresponds to a pinched area in the width direction of the continuous paper that is pinched by the segmented roller members and to the pinched area along the transport direction, that detects, without making contact with the continuous paper, an amount by which the continuous paper is transported by the transport roller pair.

Abstract: A paper cassette includes a casing and an end cap. The casing includes a receiving space for storing a stack of paper, one side of the casing defines a paper exit, the end cap is removably attached to the paper exit. When the paper exit is sealed by the end cap, the paper cassette is used to accommodate paper; when the end cap is removed from the paper exit and the paper cassette is inserted into a printing device, the paper cassette is used to feed paper to the printing device. A printing device is further disclosed.

Abstract: A printing assembly has print heads, by the use of which, application locations for printing fluid are specified. A transport path through the printing assembly, and provided for print stock, is specified by at least two guide elements. One printing section of the transport path begins at a first application location and ends at a last application location. The application locations are arranged on that transport path having specifying guide elements, each having a pivot angle, and pivoting, in a pivoting manner, about at least one pivot axis, common thereto, which pivot angle equals at least 10°. A main conveying direction is specified by a linear connection between a first guide element based on the print section and a last guide element based on the print section. The main conveying direction is arranged, having guide elements arranged in the maintenance position thereof, under an angle of 30°, at maximum, to a vertical direction.

Abstract: A device to turn band-shaped recording media between two print groups is described. The device can include an observation region for the printing region that extends across at least one print side. Water-cooled cooling rollers can be arranged in the intake region of the turning device to cool the recording medium.

Abstract: A printer includes a battery, and a conveying unit powered by the battery and configured to convey printing media at a first speed and a second speed lower than the first speed, a printing unit that prints on the printing media conveyed by the conveying unit, a measuring device that measures a residual capacity of the battery, a display for displaying information related to the residual capacity of the battery, and a processor configured to control the display to, when the residual capacity of the battery is not less than a predetermined residual capacity value, display first information indicating a total number of the printing media that can be printed at the first speed, and when the residual capacity of the battery is less than the predetermined residual capacity value, display second information indicating a total number of the printing media that can be printed at the second speed.

Abstract: A printer includes a printer body including a holder configured to house rolled recording paper, a cover configured to open and close the holder, a coupling mechanism that couples the cover to the printer body, and a detachment preventing mechanism configured to prevent the cover from being detached from the printer body. The coupling mechanism includes shafts formed on one of side plates of the cover and inner walls of the printer body, and shaft holes formed in another one of the side plates and the inner walls and configured to receive the shafts; and the detachment preventing mechanism includes a stopper that is disposed such that ends of the stopper contact inner surfaces of the side plates and configured to support the side plates and prevent the side plates from falling when a load is applied to the cover.