CN100526084C - Platen plate and liquid-discharging device - Google Patents

Abstract

A platen plate supporting an object to which liquid drops are discharged from each nozzle on the lower surface of a liquid-discharging head. The platen plate enables appropriate ink discharge while achieving flatness of the object and is capable of preventing defacement of the rear face of the object. The platen has ribs raised from a bottom face portion, extended in the transportation direction of recording paper, and arranged with predetermined intervals in the width direction of the recording paper. The platen is constructed so as to support, outside that area of the recording paper where ink drops discharged from each nozzle adhere, the recording paper rear face by top surfaces of the ribs, defining the distance between the recording paper and an ink-discharging surface. In the area where the ink drops discharged from each nozzle adhere, the ribs are formed such that their top surfaces are at a height where they do not come into contact with the rear face of the recording paper or, alternatively, the ribs themselves are not formed.

Description

Platen and liquid ejection apparatus

Technical field

The present invention relates to a kind of platen (platen plate) and a kind of liquid ejection apparatus that adopts this platen, the relative position of liquid ejection face on described platen is arranged on bottom fluid ejection head, and supporting is used to be received from the injection target (ejectionobject) of the drop of each nozzle ejection on this liquid ejection face.

Background technology

Tape deck such as ink-jet printer is called as liquid ejection apparatus, and wherein the liquid in the liquid chamber of fluid ejection head is heated and sprays via fluid injector.In this ink-jet printer, ink droplet each nozzle ejection from the China ink ejection face that is arranged on the printhead bottom surface to be forming print image, and platen is arranged on the relative position of China ink ejection face with this printhead.

By a kind of conveyer in the ink-jet printer transmits and as the record page of spraying target, platen limits the distance between black ejection face and this record page via being formed on from rear support.Tabular platen has along the width of record page and is formed on a plurality of ribs (platen rib) on the end face with predetermined space, extends with the direction of transfer along this record page.In having the ink-jet printer of this platen, the record page that supports with the rib end face transmits by conveyer, and by printing from the jet surface China ink of each nozzle to this record page.

Yet, in this ink-jet printer, vertical and level blank on eliminating record page when carrying out so-called boundless the printing or when using the size ratio record page that both sizing was little by mistake, excessive ink droplet can spray the periphery of this record page, thereby China ink can be attached to polluting this plate on the platen rib, so the bottom surface that can pollute record page attached to the China ink on this platen rib.Therefore, polluted for avoiding the record page bottom surface, need do not have ink droplet on the platen rib, so known a kind of like this platen, this platen have recessed (the black receiver) that be formed on the ink droplet adhering zone with the ink droplet that receives ejection (referring to (the 3rd to 4 page of for example Japanese Unexamined Patent Application open source literature No.2000-118058, Fig. 2 and 3) or Japanese Unexamined Patent Application open source literature No.2002-86821 (the 4th to 5 page, Fig. 1 and 2)).

Yet, among Japanese Unexamined Patent Application open source literature No.2000-118058 and the Japanese Unexamined Patent Application open source literature No.2002-86821 in disclosed technology be applied to the to have so-called string data printhead ink-jet printer of (serialtype print head), they are difficult to be applied to the to have line head printer of (line-typeprint head), in line head, many nozzle row (nozzle row) are arranged on the whole width of record page.That is to say, in printer with string data printhead, under the state that record page stops, ink droplet sprays to form image in a zone from each nozzle along the record page width is reciprocating simultaneously at printhead, transmit this record page after stopping, on next zone, to form image along direction of transfer then, like this, the flatness that is arranged on the record page under the black ejection face can not cause any problem.

Yet, in having the printer of line head, when record page is transmitted, ink droplet sprays from each nozzle that is provided with along this record page width to form image, so, can not correctly form image when under the record page that transmits below the China ink ejection face is in not by the state of smooth supporting.Especially, a kind of have be used for controlling to change situation from the printhead of the emission direction arrangement for deflecting of the ink droplet emission direction of each nozzle, the landing positions of ink droplet is along the width deflection of record page, so just need guarantee the flatness of the record page that transmits below China ink ejection face.

Summary of the invention

Therefore, the present invention is proposed with head it off, the object of the invention provides a kind of flatness of guaranteeing the injection target that transmits below liquid ejection face with accurate ejection liquid and prevent the platen that the bottom surface of this injection target is polluted, and a kind of liquid ejection apparatus that adopts this platen.

The invention provides a kind of liquid ejection apparatus, comprise be arranged on be positioned at the fluid jetting head bottom surface on the platen of the relative position of liquid ejection face, in described liquid ejection apparatus, spray target and when being transmitted, be subjected to described platen plate supporting, so that the drop that sprays each nozzle of face from described liquid is ejected on the described injection target, wherein, described platen comprises a plurality of from the rib of its bottom surface projection to extend along the direction of transfer of described injection target and to be provided at predetermined intervals along the width of described injection target, wanting outside the zone of land from the drop of described each nozzle ejection, the bottom surface of described injection target is subjected to the end face supporting of described rib, to limit the distance between described injection target and the described liquid ejection face, and wanting in the zone of land from the drop of described each nozzle ejection, the rib end face forms has a height so that described rib end face does not contact with the described bottom surface of described injection target; Described liquid ejection apparatus also comprises conveyer, described conveyer has along the projected route setting so that described injection target is sent to the conveyer belt that it discharges side from the supply side with respect to the described injection target of described fluid jetting head, in the zone of described fluid jetting head ejection, the conveyer belt of described conveyer is positioned at the rear of described platen with respect to described fluid jetting head in predetermined liquid.

For achieving the above object, according to the present invention, wanting outside the zone of land from the drop of each nozzle ejection, utilization is from the rib of its bottom surface projection to extend along the direction of transfer that sprays target and to be provided at predetermined intervals along the width of this injection target, the bottom surface of supporting this injection target is to limit the distance between this injection target and the liquid ejection face, and, the rib end face is contacted with the bottom surface of this injection target wanting in the zone of land from the drop of each nozzle ejection.

Therefore, a plurality of ribs that utilization is provided at predetermined intervals along the width of platen, guarantee the flatness of the injection target that below the liquid ejection face of fluid ejection head, transmits, thereby accurately spray liquid, the rib end face can not be ejected the China ink pollution of the peripheral ends of this injection target simultaneously, thus the back side that prevents to pollute this injection target.

Simultaneously, rib can have inclined-plane or the curved surface that is formed on along the upstream extremity place of spraying the target direction of transfer, and the front end of the injection target that transmits from the upstream with guiding is to the rib end face.So promptly the liquid of the peripheral ends of this injections target of box lunch ejection is injected on the front end of this injections target consequently the front end of this injection target and deflects to when sagging, also can guide this injection target to the rib end face, thus the flatness that prevents to stop up and guarantee page.

In addition, in the adjacent lines of a plurality of ribs, the upstream side or the rib end face on the downstream that are located at the direction of transfer that sprays target are shifted with respect to other rib end face, so that utilize these a plurality of rib supportings to spray target, thereby guarantee the flatness of broad ways.Thus, the distance that prevents to spray target deflection so that increase the face that sprays with liquid accurately is ejected into liquid on the injection target.Because the fixed distance between rib is capable has been reinforced the metal pattern that is used to form platen.

In addition, between a plurality of ribs and wanting to be provided for absorbing the imbibition material of this drop in the zone of land,, prevent to pollute the bottom surface of injection target so that reduce splashing of the drop that sprays rapidly from each nozzle from the drop of each nozzle ejection.By absorbing the drop sprayed with imbibition material, promptly convenient fluid storage also can prevent because the liquid that vibration causes overflows to a certain degree the time.

Rib can form along the width that sprays target and extend continuously, can guarantee to spray the fabulous flatness of target broad ways like this, so that China ink accurately is ejected on the surface of spraying target.

Therefore, a plurality of ribs that utilization is provided at predetermined intervals along the width of platen, guarantee the flatness of the injection target that below the liquid ejection face of fluid ejection head, transmits, thereby accurately spray liquid, the rib end face can not be ejected the China ink pollution of the peripheral ends of this injection target simultaneously, thus the back side that prevents to pollute this injection target.

Simultaneously, the front end that sprays target is directed to the rib end face, so, promptly the liquid of the peripheral ends of this injections target of box lunch ejection is injected on the front end of this injection target consequently the front end of this injection target and deflects to when sagging, also can guide this injection target to the rib end face, thereby prevent to stop up and guarantee the flatness of page or leaf.

In addition, be subjected to a plurality of ribs supportings to guarantee the flatness of broad ways, increase the distance of the face that sprays with liquid so prevented to spray target because of deflection, thereby liquid accurately is ejected on the injection target owing to spraying target.Because the fixed distance between rib is capable, the metal pattern that is used to form platen obtains reinforcing.

In addition, can reduce, thereby prevent to pollute the bottom surface of spraying target from the splashing of drop that each nozzle sprays rapidly.By absorbing the drop sprayed with imbibition material, promptly convenient fluid storage also can prevent because the liquid that vibration causes overflows to a certain degree the time.

So, can guarantee to spray the fabulous flatness of target broad ways, so that China ink accurately is ejected on the surface of spraying target.

In addition, be arranged on the route modifier that conveyer belt is positioned at the position at platen rear and is used to change the route of this conveyer belt, can utilize this route modifier easily to change the route of this conveyer belt by providing.

Description of drawings

Figure 1A-1C is the key diagram of a kind of foundation platen embodiment of the present invention; Figure 1A is its vertical view; Figure 1B is the cutaway view at Figure 1A institute timberline A-A place; And Fig. 1 C is the cutaway view at Figure 1A institute timberline B-B place.

Fig. 2 is the cutaway view that is illustrated in the state of the record page that transmits on the rib end face that is positioned on the platen.

Fig. 3 is the cutaway view of the shape of platen rib.

Fig. 4 is the vertical view of the layout of platen rib.

Fig. 5 is the perspective illustration according to a kind of ink-jet printer embodiment as liquid ejection apparatus of the present invention.

Fig. 6 is that expression comes labour contractor's box to accommodate the perspective view of the state in the resettlement section by opening the top cover that is located in the inkjet printing.

Fig. 7 is the partial sectional view of the box (head cartridge) in the liquid ejection apparatus.

Fig. 8 represents the key diagram of the internal structure of printer main body shown in Figure 5 by removing shell.

Fig. 9 is that expression head-shield shown in Figure 8 is opened/key diagram of locking mechanism.

Figure 10 A to 10E is expression when utilizing head-shield to open/key diagram of cleaning operation when locking mechanism removes head-shield.

Figure 11 is the cutaway view of the internal structure of ink-jet printer shown in Figure 5, the state of an expression box before operation start.

Figure 12 is the diagrammatic sketch of a kind of state of expression, and this state is retracted to cover retracted position (cap retracted position) with can print image for the head-shield (head cap) of the China ink ejection face of a protection box.

Figure 13 is the diagrammatic sketch that is illustrated in the open mode of printer main body in the maintenance process of ink-jet printer.

Figure 14 is the schematic sectional view of second embodiment of platen, represents a kind of like this rib, and this rib comprises the inclined-plane that is formed on the upstream extremity place and has rectilinear profiles.

Figure 15 is the schematic sectional view of the 3rd embodiment of platen, represents a kind of like this rib, and this rib comprises the curved surface that is formed on the upstream extremity place and has curved cutplanes.

Figure 16 is the schematic sectional view of the 4th embodiment of platen, represents a kind ofly not have recess and have the rib of continuous wavy end face.

Figure 17 is the schematic sectional view of the 5th embodiment of platen, represents another kind of rib layout.

Figure 18 is the perspective view of the 6th embodiment of platen, and expression forms the rib that extends continuously along the width of record page.

Figure 19 is the detailed amplification view that is connected the major part of structure of band conveyer (belt conveying means) and platen.

Figure 20 is the vertical view of platen.

The specific embodiment

Describe embodiments of the invention in detail hereinafter with reference to accompanying drawing.

Figure 1A-1C is the key diagram of a kind of foundation platen embodiment of the present invention; Figure 1A is its vertical view; Figure 1B is the cutaway view at Figure 1A institute timberline A-A place; And Fig. 1 C is the cutaway view at Figure 1A institute timberline B-B place.

As shown in Figure 2 platen 1 be arranged on be positioned at printhead 20 (below mention) bottom surface on the relative position of China ink ejection face 22, will also be used to receive the too much ink droplet of these record page 51 peripheries of ejection to store the black reservoir of this ink droplet simultaneously by the record page 51 of land on it from the ink droplet of each nozzle 23 (23k, 23c, 23m and 23y) ejection as a kind of from rear support is a kind of.

Platen 1 is made and formed shown in Figure 1A by ABS resin fully has the elongated box-like of projection piece, and this projection piece forms along the width periphery corresponding with the width of the China ink ejection face 22 of printhead 20.Platen 1 also has the extension 1a that is arranged on upstream side along the direction of transfer of record page 51, with transmission stability and the abundant ink droplet that is sprayed that stores of guaranteeing this record page 51.In addition, shown in Fig. 1 C, platen 1 has the rib 2 to 6 that extends with the direction of transfer along record page 51 from bottom surface 1b projection.Shown in Figure 1A, a plurality of ribs 2 to 6 along the width of platen 1 with arranged at predetermined intervals.

Shown in Fig. 2 and 3, the back side that rib 2 to 6 is used to support record page 51, and first to the 5th rib 2 to 6 forms in this order upstream from the direction of transfer of record page 51 to the downstream.The rib end face 2a to 6a of rib 2 to 6 has basic identical height.Rib 2 to 6 forms by wanting the back side of the regional external support record page 51 of land to limit distance between this record page 51 and the black ejection face 22 from the ink droplet of each injection nozzle 23 ejections of China ink ejection face 22 with rib end face 2a to 6a, and in ink droplet is wanted land regional this rib of eliminating.

Therefore, utilize a plurality of ribs 2 to 6 that are formed on as mentioned above on the platen 1, at the back side that the ink droplet of each injection nozzle 23 ejections that spray face 22 from China ink is wanted the regional external support record page 51 of land, to limit the distance between this record page 51 and the black ejection face 22.Want in the zone of land at the ink droplet that each injection nozzle 23 from China ink ejection face 22 sprays, rib 2 to 6 itself does not exist so that the rib end face does not contact with the back side of record page 51.Therefore, utilize, guarantee the flatness (flatness) of the record page 51 of transmission below the China ink ejection face 22 of printhead 20, so that China ink accurately is ejected on the surface of this record page 51 along a plurality of ribs 2 to 6 of platen 1 width with arranged at predetermined intervals.Simultaneously, the end face of rib 2 to 6 can not polluted owing to the China ink of the peripheral ends that sprays record page 51, to prevent to pollute the back side of this record page 51.

In the above description, in platen 1 zone of wanting land from the ink droplet of each injection nozzle 23, get rid of rib itself; Yet the invention is not restricted to this, in this zone, also can provide the rib (not shown), this rib has the height that the rib end face is not contacted with the back side of record page 51.

As shown in Figure 3, each rib 2 to 6 has to be formed on along the upstream-side-end of the direction of transfer of record page 51 and sentences the inclined-plane of the leading edge of the record page 51 that guiding transmits from this upstream side to the rib end face.For example, second rib 3 has the leading edge of the record page 51 that the inclined-plane 3b that significantly cuts sth. askew at the upstream-side-end place transmits along direction of arrow C with guiding.Therefore, the let droop front end of the record page 51 that transmits of its end utilizes the inclined-plane 3b of second rib 3 to guide to end face 3a to stop up preventing.If for example especially ink droplet jet is to the front end of record page 51 when carrying out printing (rimless printing) for no reason at all, the front end deflection of this record page 51 also is easy to let droop; Yet inclined-plane 3b is formed on the upstream extremity of second rib 3, so that the front end of inclined-plane 3b leader record page or leaf 51 that utilizes this second rib 3 is to end face 3a, thereby prevents to stop up.The the 3rd to the 5th rib 4 to 6 also forms identical shaped.

So, when through the record page 51 of the end face 3a of second rib 3 by further when direction of arrow C transmits, even if the record page 51 that its end lets droop enters between second rib 3 and the 3rd rib 4, also can guide this record page 51 not blocked, sequentially to transmit this record page 51 to subsequently the 4th and the 5th rib 5 and 6 by the upstream extremity of the 3rd rib 4 to rib end face 4a.In this manner, by with rib end face 2a to 6a supporting record page 51, can spray face 22 with China ink and keep preset distance ground to transmit this record page 51.

Simultaneously, as shown in Figure 3, first to fourth rib 2 to 5 also has inclined-plane 2c to 5c respectively according to same way as mentioned above.Therefore, although expression, promptly convenient record page 51 can not blocked by the downstream of each rib 2 to 6 along the front end of this direction of transfer when transmitting in the opposite direction with arrow C side yet.So, can prevent to stop up when transmitting in the opposite direction with arrow C side when record page 51.In the above description, each rib 2 to 6 all has the inclined-plane that is formed on the upstream extremity place; Yet, the invention is not restricted to this, can provide Any shape, as long as it stops the record page that transmits 51 to be stuck.Other concrete shape is subsequently with reference to Figure 14 to 16 explanation.

In addition, shown in Figure 1A, in the adjacent lines of a plurality of ribs 2 to 6 of platen 1, be located at the upstream of direction of transfer of record page 51 or the rib end face on the downstream with respect to other rib end face displacement.Particularly, as shown in Figure 4, the row of the 3rd rib 4 that broad ways is provided at predetermined intervals is arranged to not overlapping with the row of row that is arranged on the second rib 3 on upstream or the downstream and the 4th rib 5 on the direction of transfer of record page shown in the arrow C 51.Therefore, record page 51 is utilized rib 2 to 6 supportings of arranging as mentioned above, so that guarantee the flatness of its broad ways.China ink thus, stops the distance of record page 51 deflections so that expansion and black ejection face 22, so can accurately be ejected on the surface of this record page 51.When the rib 2 to 6 of platen 1 when same way as is arranged as mentioned above, can guarantee the distance of rib between capable, so another advantage is to reinforce the metal pattern that is used to form platen 1.

The above layout of rib 2 to 6 is not limited to shown in Figure 1A to 1C, and any layout can be provided, as long as it can guarantee the flatness of record page 51 broad ways.Other is specifically arranged subsequently with reference to Figure 17 and 18 explanations.

As shown in Figure 2, platen 1 is provided with a kind of interior blotting material 7 in zone of wanting land from the ink droplet of each injection nozzle 23 ejections that is arranged on.Blotting material 7 is made by the sponge that is used to absorb from the ink droplet of each injection nozzle 23 ejections, to carry out the ink droplet that absorbs ejection record page 51 peripheral ends when printing for no reason at all.Therefore, can reduce, prevent to pollute the bottom surface of record page 51 from each injection nozzle 23 the splashing and rebound of ink droplets of ejection rapidly.By blotting material 7 is provided,, also can prevent because the China ink that vibration causes overflows even if when China ink has been stored to a certain degree.

Because platen 1 is replaceable to be easy to maintenance, so can clean this platen 1 simply by unloading this platen 1 when being polluted by China ink.

Fig. 5 is according to the perspective view of the present invention as a kind of ink-jet printer 11 embodiment of liquid ejection apparatus example.Form image for spraying ink droplet by the precalculated position on record page, ink-jet printer 11 comprises printer main body 12, a box 13 (referring to Fig. 6) and record page dish 14.

Printer main body 12 comprises a kind of connecting gear and a kind of circuit that is used for suitable print image on this record page that is stored in the record page in the record page dish 14 that be used to transmit, the both is housed in the inside of this printer main body 12, and the insertion of the dish in being arranged at the following front portion of this printer main body 12 mouthful 15 places, record page dish 14 removably connects.Dish insert mouthfuls 15 also as record page go out page or leaf mouthful be positioned on 14 lip-deep pages of receiver 14a of record page dish so that the record page of printing printer main body 12 in is discharged to.In the upper forepart of printer main body 12, provide display board (display) 16 to show the whole operation state of ink-jet printer 11.

On the end face of printer main body 12, loam cake 17 can connect with opening, and as shown in Figure 6 when this loam cake 17 is opened, and resettlement section 18 is located on the upper surface of this printer main body 12 to accommodate a box 13.The box 13 installed along the Z direction is accommodated removably to keep this box 13 in it in the resettlement section 18 of printer main body 12.Box 13 comprise have yellow Y, the printhead 20 of pinkish red M, blue or green C and black K four looks China ink jars 19 and be installed in head-shield 21 on these printhead 20 bottom surfaces.Printhead 20 is called as full line formula printhead, and have on the bottom surface that is arranged on its black ejection face and with record page (for example, the injection nozzle of the whole width correspondence A4 size in the Nippon Standard) is capable, forms the image with Rack on this record page under the state in this record page is fixed on resettlement section 18 China ink is ejected into.

Fig. 7 is the partial sectional view of a box 13.China ink jar 19 is a kind of liquid containers that are used for storing China ink (predetermined liquid), and separably by four the China ink jar 19ys corresponding with four looks China ink Y, M, C and K, 19m, 19c and 19k form.Printhead 20 is a kind of being used for by from China ink jar 19y, and 19m, 19c and 19k receive China ink and spray this black fluid jetting head, and have injection nozzle (fluid injector) 23 row on the China ink ejection face 22 that is arranged on its bottom surface.

On the bottom surface of printhead 20, head-shield 21 detachably and is movably installed with respect to this printhead 20.Head-shield 21 forms elongated box-like, and has from the parts of its four limits projection China ink ejection face 22 with protection printhead 20.The waste liquid receiver 25 that head-shield 21 comprises the clearer (cleaning device) 24 of the black mud that is used for wiping multiviscosisty when moving past black ejection face 22 and adheres to and is used to receive invalid ejection China ink, the both is arranged in the head-shield 21.Clearer 24 by have elasticity and hygroscopic member for example sponge make.Waste liquid receiver 25 by have hygroscopic member for example sponge make.Reference number 26 representatives are arranged on the nozzle seal that sprays the position of face 22 in the head-shield 21 near the China ink of printhead 20.When not printing usually, injection nozzle 23 usefulness head-shields 21 are protected so that China ink does not become dry.

The moving structure of head-shields 21 then, is described with reference to Fig. 8 and 9.Fig. 8 represents the key diagram of the internal structure of printer main body 12 shown in Figure 6 by removing shell; Fig. 9 is that the expression head-shield is opened/key diagram of locking mechanism.With reference to Fig. 8, be directed downwards along arrow Z at a box 13 and be installed in the printer main body 12 with after it being housed in the resettlement section 18, head-shield opens/locking mechanism 27 about forward 90 ° so that this box 13 is fixed on the printer main body 12.At this moment, head-shield 21 and head-shield shown in Figure 8 are opened/locking mechanism 28 engagements.

Fig. 9 represents that in detail head-shield opens/side view of locking mechanism 28.At first, the head-shield 21 that is attached with clearer 24 on it shown in Figure 7 is bearing in a kind of its bottom side as shown in Figure 9 and is formed with on the mobile tooth plate 40 of spur rack 29.At the mobile tooth plate 40 that is used for moving head-shield 21 along arrow D and E direction, make the straight line on two pilot pin 41a and 41b that is located at these interior plate that moves tooth plate 40 two upper ends and an outer panel 42 that is formed on printer main body 12 move guide groove 43 engagements, and be formed on tooth bar 29 and pinion 30 engagements of rotating on this bottom side of moving tooth plate 40 via worm gear 45, this worm gear 45 is connected in the rotating shaft of mobile motor 44, and this moves motor 44 and is connected on the outer panel 42.

A lateral surface of head-shield 21 is provided with two front/rear cover pilot pin 46a and the 46b that stretches out towards mobile tooth plate 40.In the pars intermedia of an outer panel 42 of printer main body 12, two cover guide grooves 47 and 48 are bent to reservation shape to form the motion track of head-shield 21.So, make the cover guide groove 47 and 48 engagements of an outer panel 42 of two front/rear cover pilot pin 46a of head- shield 21 and 46b and printer main body 12 respectively.In addition, the front guide pin 46a and the guide groove 49 at the front end place that vertically is formed on mobile tooth plate 40 are meshed.

Utilize this mechanism, by drive mobile motor 44 via worm gear 45 along arrow F and G direction rotation pinion 30, make to utilize tooth bar 29 with 30 engagements of this pinion along arrow D and the mobile tooth plate 40 of E direction.Because make front guide pin 46a and guide groove 49 engagements that are positioned at mobile tooth plate 40 front end places this moment, head-shield 21 moves along arrow D and E direction with mobile tooth plate 40.At this moment, the motion track of head-shield 21 is by limiting with the cover guide groove 47 of two front/rear cover pilot pin 46a and 46b engagement and 48 shape respectively.

Then, utilizing the head-shield of structure as mentioned above to open/clean operation when locking mechanism 28 moves head-shield 21 with reference to Figure 10 A to 10E explanation.At first, Figure 10 A represent a kind of under the starting stage head-shield 21 sealing printheads 20 China ink ejection face 22 and with the state of nozzle seal 26 protection Y, M, C and K four look injection nozzles 23.

If open triggering signal (open trigger signal) start, print at printer beginning or operator when sending indication from then on state be transfused to printer main body 12, mobile motor 44 so shown in Figure 9 just rotates so that head-shield 21 beginnings are moved along arrow D direction shown in Figure 10 B.At this moment, the clearer of being made by for example sponge 24 rotates when cleaning black ejection face 22 along with head-shield 21 mobile in turn.In rotation process, wipe multiviscosisty and attached to the black mud on Y, M, C and the K four look injection nozzles 23 with clearer 24.

In addition, in the time of when the waste liquid receiver 25 (referring to Fig. 7) that utilizes optics or mechanical pick-up device (not shown) to detect to be made by for example sponge arrives injection nozzle 23 after wiping black mud with clearer 24 under, carry out and be used to prevent that the invalid China ink that injection nozzle 23 stops up from spraying (blank ink ejection).Figure 10 B represents the state of the invalid China ink of ejection (blank ink) on the waste liquid receiver 25 that arrives under the Y look injection nozzle 23 after the black mud of wiping Y look injection nozzle 23 with clearer 24.Figure 10 C represents the state of the invalid China ink of ejection on the waste liquid receiver 25 that arrives under the K look injection nozzle 23 after the black mud of wiping K look injection nozzle 23 with clearer 24.

Finish the wiping under the state that sprays with invalid China ink of whole Y, M, C and K four look injection nozzles 23 in this manner, shown in Figure 10 D, head-shield 21 moves at utmost to be fixed on retracted position along arrow D direction.Under this state, printer main body 12 and a box 13 printable images.

In case finish predetermined the printing, closed triggering signal (close trigger signal) just is transfused to printer main body 12 and mobile motor 44 shown in Figure 9 and turns to, so shown in Figure 10 E, head-shield 21 moves along the arrow E direction from retracted position, to return the home position along the track identical with arriving route.In this return route, clearer 24 is not only wiped, and does not carry out invalid China ink and spray.This is for life-span that prolongs clearer 24 and delay unit replacing.When head-shield 21 when the arrow E direction moves at utmost, system turns back to the original state shown in Figure 10 A.

Figure 11 is the cutaway view of object lesson of the internal structure of ink-jet printer 11, the state of an expression box 13 before operation start; Figure 12 represents to protect the head-shield 21 of the China ink ejection face 22 of printhead 20 to be retracted to the cover retracted position with state that can print image.Ink-jet printer 11 comprises as shown in figure 11 and send page device 50, this send page device 50 to have the roller that is arranged on record page dish 14 lower front end places along direction of insertion, this record page dish 14 is installed in the dish of being located on 12 times fronts of printer main body and inserts in the mouth 15, so can supply the record page 51 that is stored in this record page dish 14 as required.The separator of being made up of two opposed facing rollers 52 also is provided, also carries the record page 51 that stores with overlaying state one by one so that separate.In addition, provide the reverse rollers 53 that direction is arranged on place, printer main body 12 tops that forwards, so that the direction of transfer of this record page 51 is reverse along the record page 51 of being separated by separator 52.

Along the front of the direction of transfer that utilizes the reverse record page 51 of reverse rollers 53 in this record page 51, band conveyer 54 and above-mentioned platen 1 are provided, and as shown in figure 11 under print state not, the front end 55 of band conveyer 54 descends along arrow H direction, forms big gap with the bottom surface with printhead 20.Under print state shown in Figure 12, the front end 55 of band conveyer 54 is along the rising of arrow I direction and make its level, forms little gap with the bottom surface with printhead 20.

Under printing halted state shown in Figure 11, the bottom surface of printhead 20 covers with protection injection nozzle 23 with head-shield 21 and is dried to obstruction.Head-shield 21 also is provided with clearer 24, cleans injection nozzle 23 to be accompanied by the retraction operation that this head-shield 21 is retracted to predetermined cover retracted position (referring to Figure 12) before the printing in beginning.

Then, with the explanation operation of the ink-jet printer 11 of structure as mentioned above.At first, as shown in Figure 6, by opening the loam cake 17 that is positioned on printer main body 12 end faces, printhead 20 is installed and and is housed in the resettlement section 18 along arrow Z direction.Record page dish 14 inserts the dish that is located on 12 times fronts of printer main body and inserts in the mouth 15.At this moment, as shown in figure 11, in the inside of printer main body 12, the front end 55 of band conveyer 54 seals to be the printing halted state with head-shield 21 along the bottom surface of decline of arrow H direction and printhead 20.

Then, in case the control signal that input begins to print, head-shield 21 just moves to be retracted to predetermined head-shield retracted position along arrow J direction shown in Figure 11.At this moment, shown in Figure 10 A to 10E, clearer 24 slips over the China ink ejection face 22 of printhead 20 together in company with the retraction operation of head-shield 21, with cleaning injection nozzle 23.

When head-shield 21 is retracted to predetermined head-shield retracted position, the front end 55 of band conveyer 54 rises along arrow I direction shown in Figure 11, between this band conveyer 54 and printhead 20, to form predetermined little gap, stop then as the record page path of level.

Under printing state shown in Figure 12, drive and to send page device 50, and be stored in record page 51 in the record page dish 14 with overlaying state along the supply of arrow K direction.At this moment, utilize separator 52, record page 51 is separated one by one to carry along arrow L direction as required.

The record page 51 of being carried makes direction of transfer reverse via reverse rollers 53, and is transferred into band conveyer 54.Then, record page 51 is sent to the bottom of printhead 20 via band conveyer 54.

In addition, when record page 51 arrived the bottom of printheads 20, the input print signal also drove the predetermined heating resistive element of this printhead 20.Then, Zi the row of the injection nozzle 23 corresponding with four looks China inks ink droplet jet on the record page 51 of conveying at a predetermined velocity, to form the colour print image thereon.

In foundation this ink-jet printer 11 of the present invention, above-mentioned platen 1 is positioned at and the relative position of China ink ejection face 22 on printhead 20 bottom surfaces, so utilize a plurality of ribs that are provided at predetermined intervals along this platen 1 width, the bottom surface of record page 51 is supported outside the zone of wanting land from the ink droplet of each injection nozzle 23 ejections, to limit the distance between this record page 51 and the black ejection face 22, and, the rib end face is contacted with the bottom surface of record page 51 wanting in the zone of land from the ink droplet of injection nozzle 23 ejections.Therefore, utilize a plurality of ribs that are provided at predetermined intervals along platen 1 width, guarantee the flatness of the record page 51 of transmission below China ink ejection face 22, so that China ink accurately is ejected on the surface of this record page 51.When execution was for example printed for no reason at all, the China ink that the rib end face can not be ejected record page 51 peripheral ends polluted, to prevent to pollute the back side of this record page 51.

In case finish the each printing on the record page 51 in this way, as shown in figure 12, transmit this record page 51 from the below of printhead 20 along arrow M direction, so that be positioned on 14 lip-deep pages of receiver 14a of record page dish via also being discharged to as the dish insertion mouth 15 that goes out the page or leaf mouth.Then as shown in figure 11, the front end 55 of band conveyer 54 along arrow H direction descend and the bottom surface of head-shield 21 sealing printheads 20 turning back to the printing halted state, and stop the operation of ink-jet printer 11.

Simultaneously, Gou Zao ink-jet printer 11 has the mechanism that is used for opening in maintenance process printer main body 12 as shown in figure 13 as mentioned above, stops the corrective action of stopping up to have.Above-mentioned band conveyer 54 has the conveyer belt 57 that is wound between two head pulley 56a and the 56b, be located in the pars intermedia of band conveyer 54 idler roller 58 with the tension force of regulating this conveyer belt 57, be located at respect in record page 51 supply sides of printhead 20 with opposed facing guide plate and hold-down roller (pinch roller) 60 and be located in the discharge side of record page 51 to form the predetermined projection roller (spur roller) 61 that transmits route.

Describe the syndeton of band conveyer 54 and platen 1 in detail with reference to Figure 19.In band conveyer 54 and platen 1, shown in Figure 11 to 13, it is relative and can descend or rising with respect to this printhead 20 that platen 1 is configured to China ink ejection face 22 (referring to Fig. 7) with printhead 20.Band conveyer 54 has the conveyer belt 57 that is wound between two head pulley 56a and the 56b, be located in the pars intermedia of band conveyer 54 idler roller 58 with the tension force of regulating this conveyer belt 57, be located at respect in record page 51 supply sides of printhead 20 with opposed facing guide plate 59 and hold-down roller 60 and be located in the discharge side of record page 51 to form the predetermined projection roller 61 that transmits route.

The first head pulley 56a and the second head pulley 56b form predetermined two ends of transmitting route, and give the main shaft 62 of the first head pulley 56a as the rotation of the motor (not shown) of drive unit via gear transmission, to utilize this first head pulley 56a as driving pulley and utilize the second head pulley 56b to drive conveyer belt 57 as follow-up pulley.Conveyer belt 57 is made by synchronous band (timing belt), and this is with synchronously is a kind of driving-belt with tooth, utilizes the tooth such as flat tooth, helical tooth or double helical teeth one class, and conveyer belt 57 can not have slippage and noiselessness ground rotates.

Hold-down roller 60 and projection roller 61 are followed the rotation of conveyer belt 57 and are rotated.Hold-down roller 60 is pressed to guide plate 59 with predetermined pressure, thereby carries the lower position of this record page 51 to printhead 20 by record page 51 being pressed on the conveyer belt 57 along arrow M direction as shown in figure 19.Projection roller 61 is pressed to the second head pulley 56b with predetermined pressure, thereby derives the record page 51 that is delivered to downstream, printhead 20 position on the conveyer belt 57 by record page 51 is pressed on, and this record page 51 is sent to out the page or leaf mouth.

According to present embodiment, in the zone of printhead 20 ejections, the conveyer belt 57 of band conveyer 54 is positioned at the rear (downside of Figure 10) of platen 1 with respect to this printhead 20 at China ink.Be positioned at the position at platen 1 rear at conveyer belt 57, be provided for changing the route modifier (the first deflector roll 63a, the first guide plate 64a, the second deflector roll 63b and the second guide plate 64b) of the route of this conveyer belt 57.

That is to say, as shown in figure 19, platen 1 be used for supporting strap conveyer 54 framework and under the connected state, transmission route along the conveyer belt 57 that is positioned at printhead 20 lower position, the first deflector roll 63a and the first guide plate 64a are provided near the record page 51 supply side ends with respect to platen 1, and the second deflector roll 63b and the second guide plate 64b are provided at respect to the record page 51 of platen 1 and discharge near the side ends.Utilize the first deflector roll 63a and the first guide plate 64a channeling conduct, the rear (downside) of concealing into platen 1 in the front side, supply side end of record page 51 by the route that allows conveyer belt 57 changes this route, utilize the second deflector roll 63b and the second guide plate 64b channeling conduct simultaneously, floating at the outlet side rear of record page 51 by the route that makes conveyer belt 57 changes this route to platen 1 top position.

Therefore, in the zone of printhead 20 ejections, conveyer belt 57 rotates by the rear (downside) of hiding platen 1 at China ink, so can not be attached on this conveyer belt 57 from the China ink of these printhead 20 ejections.

Many conveyer belt 57 is provided at predetermined intervals along the direction approximately perpendicular to record page 51 direction of transfer M as shown in figure 20.Figure 20 is the vertical view of platen 1, and the first deflector roll 63a is located at the left side of figure, and the second deflector roll 63b is located at the right side of figure.In this figure, four elongated conveyer belt 57a, 57b, 57c and 57d along approximately perpendicular to record page 51 longitudinally direction with arranged at predetermined intervals.The invention is not restricted to four alignment conveyer belts, the conveyer belt 57 of other quantity can be set.The invention is not restricted to elongated band, can be provided with one with the identical or wideer broadband of record page 51 width.

Figure 14 is the schematic sectional view of expression second embodiment of the invention.According to this embodiment, platen 1 has a plurality of ribs 3 to 5 of bottom surface 1b projection to extend along record page 51 direction of transfers from this platen 1.A plurality of ribs 3 to 5 have the inclined-plane 3d to 5d that is formed on along the upstream extremity place of record page 51 direction of transfers, this inclined-plane has the processing end face of rectilinear profiles and does not have the end face that supports record page 51, so this record page 51 is by the top side supporting that is formed on downstream end, and the top side of this downstream end has basic identical height.This example has with Fig. 2 and advantage identical shown in 3.

Figure 15 is the schematic sectional view of expression third embodiment of the invention.According to this embodiment, platen 1 has a plurality of ribs 3 to 5 of bottom surface 1b projection to extend along record page 51 direction of transfers from this platen 1.A plurality of ribs 3 to 5 have the curved surface 3e to 5e that is formed on along the upstream extremity place of record page 51 direction of transfers, and this curved surface has the processing end face (1/4 arc sections) of rectilinear profiles.This example also has with Fig. 2 and advantage identical shown in 3.

Figure 16 is the schematic sectional view of expression fourth embodiment of the invention.According to this embodiment, a kind of rib 8 of the bottom surface 1b projection from platen 1 does not have recess and has continuously wavyly, and in the inadhering zone of ink droplet, this end face forms lowly so that should not contact with record page 51 in the zone.This example also has with Fig. 2 and advantage identical shown in 3.

Figure 17 is the schematic sectional view of expression fifth embodiment of the invention.According to this embodiment, in the rib 3 to 6 of platen 1, the row of the row of second rib 3, the 3rd rib 4 and the row of the 4th rib 5 are configured to not overlapped along 51 direction of transfers of record page shown in the arrow C.The row of the row of the 6th rib 6 and second rib 3 is configured to along record page 51 direction of transfers overlapped.Therefore, rib 3 to 6 supportings that record page 51 is subjected to being provided with as mentioned above accurately are ejected on the surface of this record page 51 thereby handle is black to guarantee the flatness of broad ways.

Figure 18 is the perspective view of expression sixth embodiment of the invention.According to this embodiment, the rib 3 of platen 1 ' to 5 ' form along the width of record page 51 and extend continuously.In this case, record page 51 is subjected to the rib 3 that forms continuously along this record page 51 whole widths ' to 5 ' supporting, guaranteeing the fabulous flatness of broad ways, thereby China ink accurately is ejected on the surface of this record page 51.In Figure 18, the rib 3 of platen 1 ' to 5 ' form continuously along the whole width of record page 51; Yet, the invention is not restricted to this, rib 3 ' to 5 ' also can be along forming than the little width of record page 51 whole width, with only in predetermined space broad ways extend continuously.

In the above description, as an example with ink-jet printer; Yet, the invention is not restricted to this, but can adopt any device, as long as its liquid that is contained in the liquid chamber sprays from fluid injector as drop.For example, can adopt ink-jet image forming apparatus for example picture unit or duplicator.

Simultaneously, the liquid that sprays from injection nozzle 23 is not limited to China ink, but can adopt the blowoff that uses other liquid, as long as the liquid in its ejection liquid chamber is to form some a row or a point.For example, can adopt in DNA identifies the solution that contains DNA is ejected into liquid ejection apparatus on the pallet.

Claims (6)

1. liquid ejection apparatus, comprise be arranged on be positioned at the fluid jetting head bottom surface on the platen of the relative position of liquid ejection face, in described liquid ejection apparatus, spray target and when being transmitted, be subjected to described platen plate supporting, so that the drop that sprays each nozzle of face from described liquid is ejected on the described injection target

Wherein, described platen comprises a plurality of from the rib of its bottom surface projection to extend along the direction of transfer of described injection target and to be provided at predetermined intervals along the width of described injection target, wanting outside the zone of land from the drop of described each nozzle ejection, the bottom surface of described injection target is subjected to the end face supporting of described rib, to limit the distance between described injection target and the described liquid ejection face, and wanting in the zone of land from the drop of described each nozzle ejection, the rib end face forms has a height so that described rib end face does not contact with the described bottom surface of described injection target;

Described liquid ejection apparatus also comprises conveyer, and described conveyer has along the projected route setting so that described injection target is sent to the conveyer belt that it discharges side from the supply side with respect to the described injection target of described fluid jetting head,

In the zone of described fluid jetting head ejection, the conveyer belt of described conveyer is positioned at the rear of described platen with respect to described fluid jetting head in predetermined liquid.

2. device according to claim 1, wherein, described rib has inclined-plane or the curved surface that is formed on along the upstream extremity place of the direction of transfer of described injection target, and the front end of the described injection target that transmits from the upstream with guiding is to described rib end face.

3. device according to claim 1, wherein, in the adjacent lines of described a plurality of ribs, the upstream side or the rib end face on the downstream that are located at the direction of transfer of described injection target are shifted with respect to other rib end face.

4. device according to claim 1 wherein, is being wanted to be provided for absorbing the imbibition material of described drop in the zone of land from the drop of described each nozzle ejection.

5. device according to claim 1, wherein, described rib forms along the width of described injection target and extends continuously.

6. device according to claim 1 wherein, also comprises being arranged on the route modifier that described conveyer belt is positioned at the position at described platen rear and is used to change the described route of described conveyer belt.

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