EP0684139A1 - Ink supplying device and ink jet recording apparatus using the same - Google Patents
Ink supplying device and ink jet recording apparatus using the same Download PDFInfo
- Publication number
- EP0684139A1 EP0684139A1 EP95110640A EP95110640A EP0684139A1 EP 0684139 A1 EP0684139 A1 EP 0684139A1 EP 95110640 A EP95110640 A EP 95110640A EP 95110640 A EP95110640 A EP 95110640A EP 0684139 A1 EP0684139 A1 EP 0684139A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- ink
- recording
- cap
- head
- recording head
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/17—Ink jet characterised by ink handling
- B41J2/175—Ink supply systems ; Circuit parts therefor
- B41J2/17503—Ink cartridges
- B41J2/1752—Mounting within the printer
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/135—Nozzles
- B41J2/165—Prevention or detection of nozzle clogging, e.g. cleaning, capping or moistening for nozzles
- B41J2/16517—Cleaning of print head nozzles
- B41J2/1652—Cleaning of print head nozzles by driving a fluid through the nozzles to the outside thereof, e.g. by applying pressure to the inside or vacuum at the outside of the print head
- B41J2/16523—Waste ink transport from caps or spittoons, e.g. by suction
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/135—Nozzles
- B41J2/165—Prevention or detection of nozzle clogging, e.g. cleaning, capping or moistening for nozzles
- B41J2/16585—Prevention or detection of nozzle clogging, e.g. cleaning, capping or moistening for nozzles for paper-width or non-reciprocating print heads
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/17—Ink jet characterised by ink handling
- B41J2/175—Ink supply systems ; Circuit parts therefor
- B41J2/17503—Ink cartridges
- B41J2/17513—Inner structure
Definitions
- the present invention relates to an ink supplying device and an ink jet recording apparatus having such ink supplying device.
- an ink jet recording apparatus is excellent in that it can perform a high speed recording since a noise during the recording is very small and it can be easily constructed as a high density multiple discharge port type ink jet printer. Further, it has been interested in that the ink jet printer has good color reproducibility for a color image.
- an ink jet recording system ink jet recording apparatus
- ink jet recording apparatus is so constructed that ink droplets are caused to be discharged and fly from a discharge port of a recording head, and recording is carried out with their sticking on a recording sheet. So, in the ink jet recording apparatus, it is needed to supply surely ink to the ink jet recording head. In the past, various contrivances have been made for this purpose.
- a method is known of obtaining a sure connection of the flow path with the connecting portion of the ink cartridge side by causing the member of the device side to have a degree of freedom, as shown in Japanese Patent Laid-Open Application No. 60-137658.
- the above-mentioned cartridge type ink tank arrangement is weak in vibration and shock because it holds ink with a soft bag, and if the manners in which the bags collapse are nonuniform, then the pressure with which ink is let to flow would be often caused to change. Accordingly, this arrangement is not suitable to a large volume ink tank, and in fact it is realized as a relatively small ink tank.
- an ink tank shown in Japanese Laid-Open Patent Application No. 56-13456 which has a construction which is strong in vibration and shock and permits it to be voluminous by holding ink between the outside of the bag which communicates to the air and a frame.
- the problem relating to the change of the pressure with which ink flows out which is due to a difference between the manners in which the bags collapse (or swell) is not solved entirely, and it is needed to cause ink to flow out compulsively with an ink pump, store ink temporarily in a sub-tank which is provided with special means communicating to the air and then supply it to the head, so as thereby to carry out stabilized ink supplying.
- an ink cartridge having its construction wherein a waste liquid absorbing body is added to the ink tank of the above-mentioned arrangement and the ink tank and a waste liquid tank are made to be in a body by enclosing them with a frame, between which a member intervened.
- the waste liquid absorbing body in general, felt or foaming resin, etc. is used to hold therein waste ink for the collection thereof.
- an object of the present invention is to provide an ink supplying device wherein recording can be continued suitably, and an ink jet recording apparatus using this ink supplying device.
- a further object of the present invention is to provide an ink supplying device wherein ink can be supplyed suitably, and an ink jet printing apparatus using this ink supplying device.
- Another object of the present invention is to provide an ink supplying device wherein connection between an ink cartridge and the device body can be carried out easily and reliably, and an ink jet printing apparatus using this ink supplying device.
- Still another object of the present invention is to provide an ink supplying device wherein the protection for an ink cartridge is made surely, and an ink jet recording apparatus using this ink supplying device.
- the present invention which will be explained hereinafter was made on the bases thereof, and relates to a ink jet recording apparatus comprising ink supplying means for permitting the supply of ink to an ink jet recording head and an ink cartridge detachably mounted on said ink supplying means and providing with an ink tank accommodating therewithin ink to be supplied, said ink supplying means having a stationary ink supplying side joint portion adapted to be connected to said ink tank, said ink tank within said cartridge having an ink tank side joint portion connected to said ink supplying side joint portion and supplying ink, and said ink tank having a freedom of motion in the rotation direction with respect to the central axis of its joint portion to permit said ink tank to displace when said ink supply side joint portion and said ink tank side joint portion are connected to each other.
- the ink container is retained movably within the frame enclosing it, specially in the direction of its rotation with respect to the central axis of the connecting portion (joint portion), and thus, a freedom in connection of the connecting portion of the device side and the corresponding connecting portion of the ink cartridge side is easily secured, and even though there are provided a plurality of flow paths to be connected, the positioning of the device side joint portions to the ink container side joint portion is made easily and surely.
- the joint portion of the device side (ink supplying means side) is made to be stationary, the distribution of the ink tube form here to the recording head can be made to be compact and simple.
- this invention relates to in an ink supplying device having a plurality of ink paths adapted to be connected to an ink jet recording head, joint means comprising a first ink coupling portion connected to said ink jet recording head through an ink pump, a second ink coupling portion different from said first ink coupling portion and connected to said ink jet recording head, and a connecting portion for performing communication to the air, whereby an ink tank with said portions is detachably mounted to said ink jet recording head.
- the ink supply can be carried out very suitably without the use of not only the ink bag but also the sub-tank since the ink supporting port is jointed directly to the member constituting the ink supplying path. Also, since the port of the ink tank opening to the air is joined to the connecting portion for performing the communication to the air so that the ink tank can be caused to communicate to the air, it is possible to provide the ink tank which does not request that it be in the form of the above-mentioned bag arrangement, which is strong in vibration and shock and which is voluminous. avoidable that the recording becomes inactive under a predetermined number of recording papers.
- Fig. 1A is a central sectional view showing an embodiment of facsimile apparatus characteristically representing the present invention.
- Fig. 1 B is a top plan view thereof, and
- Fig. 2 is a cross-sectional view showing the apparatus in an open state.
- the facsimile apparatus of the present embodiment roughly comprises original conveying system A, optical system B, power source unit C, electric circuit board D, recording sheet conveying system E, decurling system F, ink supply system G, and recovery system H.
- original conveying system A and optical system B constitute an original reading unit for reading original images.
- original coveying system A conveys the aforesaid original 2 sequentially by a roller train (rollers R1, R2, R3, and R4) driven by driving means (not shown) in order to read the original image of original 2.
- the original line information is transferred by condenser lens Le to line CCD 100 through the reflective optical path of optical system B (lamp L1, mirrors M1 and M2) from a given position for reading the original line (main scanning line) in the course of its conveyance, and is converted into electrical signals for the reading of the original information.
- recording sheet conveying system E sequentially conveys recording sheet, which is wound in roll, by a roller train driven by driving means (not shown) to a passage shown in Fig. 1, and recording is performed in the course thereof by discharging ink from discharging ports of recording head 38 onto a given recording line of the recording sheet. Ink is discharged from the discharging ports of recording head 38 with the utilization of heat energy. This heat energy is generated by an electric heat converter provided in recording head 38.
- power source unit C received a normal AC to convert it into all the necessary voltage currents and supplies them respectively to each of the units of the apparatus.
- the electric circuits with electric circuit board D at its center controls the functional operation of each unit of this apparatus mainly with a cimcrocom- puter system provided. It also performs the connection and disconnection with transmission line as well as the input and output of image information signals.
- Ink supply system G supplies ink to the recording head, and recovery system H performs the cleaning and capping of the face of discharging ports, which are needed for the maintenance of the head.
- rolled recording sheet 1 is positioned almost in the center of the apparatus, and on the left-hand side thereof, original conveying system A, optical system B, and power source unit C are arranged in the vertical direction, and on the right-hand side thereof, recording head 38, record head recovery system H, and ink supply system G with ink tank 86 are arranged sequentially in that order from the above.
- recording head 38, recording head recovery system H, and ink supply system G are thus arranged sequentially from the above, the ratio of pressure variation of ink tank 86 against the orifice face of recording head 38 is reduced (i.e., the pressure against each of the discharging ports is equalized) even if the apparatus is inclined according to the present embodiment, and an excellent recording can be performed. This is due to an arrangement such that despite the miniaturization of the apparatus, the space between the orifice face of recording head and the ink tank 86 is made greater.
- Rolled recording sheet 1 is installed, and is pinched by driving feed roller 7 and free roller (platen roller) 8 which is in contact with said driving roller 7 through decurling system F for straightening out the curl formed on this recording sheet 1.
- Feed roller 7 is driven by driving means (not shown) with, for example, a stepping motor as its power source.
- Fig. 3 is a perspective view showing parts arranged in the longitudinal direction in the vicinity of free roller 8 (platen roller).
- a first platen side plate 13a and a second platen side plate 13b fixed to or integrally formed with recording frame 19 support free roller 8 with a play in such a manner that the shaft of the free roller is penetrated through the opening 13c provided each of the side plates, having a larger diameter than that of the shaft.
- the E rings 29 and 30 are fixed respectively at both ends of the shaft of free roller 8 as locks and further, on both shaft parts of free roller 8, bearings 10a and 10b, the inner and outer diameters of which are accurately regulated to provide an equal coaxiality, are fittedly mounted on the shaft of free roller 8 to enable it to be freely rotated.
- the aforesaid first platen side plate 13a and second platen side plate 13b are slidably arranged each with the respective platen pressure shaft 12a and 12b mounted on the inner side thereof as shown in Fig. 3. Then, by the functions of springs 11 a and 11 b, the aforesaid platen pressure shafts 12a and 12b are in contact with bearings 10a and 10b of the aforesaid free roller 8 respectively to exert pressure against each of them.
- recording head 38 is at the recording position.
- free roller 8 is positioned by being in contact in two directions with feed roller 7 by the pressure exerted by free roller 8 as well as with recording head 38 by contacting the aforesaid bearings 10a and 10b.
- the direction, in which the pressures of platen pressure shafts 12a and 12b of free roller 8 are exerted is set towards the direction that free roller 8 is in contact with free roller 7 and that bearings 10a and 10b are in contact with recording head 38.
- recording guide 14 made of thin plastic plate guides the aforesaid recording head 38, so that the recording head is rotated to the recording position with head shaft 36 as its rotational center.
- the sheet path is matched with the recording line position, and recording head 38 discharges ink from its discharging ports onto the aforesaid recording line position for recording at the time of recording.
- recording sheet 1 is pinched by first exhaust sheet roller 21 and the roller train 17a - 17g and roller train 18a - 18g which are in contact with the aforesaid first exhaust sheet roller 21 to be conveyed while being guided by first curvature guide 15 and first exhaust sheet guide 20.
- the aforesaid first exhaust sheet roller 21 is driven by the driving system of the same power source as feed roller 7, and is so arranged that the peripheral speed of the aforesaid first exhaust sheet roller 21 is slightly faster than that of the aforesaid feed roller 7.
- Fig. 4 is a perspective view showing the parts arranged in the longitudinal direction in the vicinity of first exhaust sheet roller 21.
- Rollers 17a - 17g and roller 18a - 18g are arranged alternatively with first curvature guides 15a - 15f. Each of them is rotatably supported by shaft 31 and shaft 32 and both ends of the shafts are locked by E rings, etc.
- shaft 32 is regulated by receiving side 9a of the first exhaust sheet rollers, which is fixed to or integrally formed with recording frame 19 and receiving side 19b of the second exhaust sheet rollers, and also in the horizontal direction, the shaft is regulated at both ends thereof by the vertically elongated through holes having the diameter fitted to that of shaft 32, through which the shaft is penetrated.
- recording sheet 1 is guided to upper exhaust sheet guide 23 and trailing exhaust sheet guide 24 through the space between both edges 22a and 22b which cut the recording sheet into each of the receiving one pages and is further guided and conveyed by second exhaust sheet roller 25 and the rollers 27a - 27g and rollers 28a - 28g which are in contact therewith.
- second exhaust sheet roller 25 is also driven by the driving system in such a manner that the peripheral speed thereof is set at a speed slightly faster than that of the aforesaid first roller 21.
- rollers 27a - 27g and rollers 28a - 28g are arranged alternately with second curvature guides 26a - 26f and are rotatably supported respectively by shaft 33 and shaft 34. Then, both ends of shaft 34 are locked with E rings, etc.
- Shaft 33 is regulated at both ends thereof by exhaust sheet roller receiving sides 19c and 19d fixed to or integrally formed with recording frame 19, having vertically elongated holes fitted respectively to the diameter of shaft 33, through which both ends of the shaft are penetrated horizontally. The ends thereof are also locked by E rings, etc.
- Fig. 1 shows the state of the system at the time of recording, and at the time of replacing the recording sheets or troubleshooting in conveying recording sheet, recording frame 19 can be opened or closed with hinge 19e of recording frame 19 as its pivoting point.
- the recording frame can be opened just along the recording sheet conveying path as its boundary, and the arrangement is designed to place each of the components belonging to recording frame 19 above this boundary and each of those belonging to main body frame 63 below the boundary.
- This recording frame 19 and the assembly of its components thereon are shown in Fig. 5.
- recording head 38, recording head recovery system H, and ink supply system G are sequentially arranged from the above in that order.
- recording sheet 1 is guided in the horizontal direction above recording head 38 after the recording has been completed by recording head 38, and is further conveyed downwards thereafter to exhaust sheet stacker 40 for stacking.
- the path through which the aforesaid recording sheet is being guided in the aforesaid horizontal direction forms the aforesaid boundary along which the main body is opened. Therefore, according to the present embodiment, it is easy to remove a clogged sheet if any clogging should occur, and further, it is possible to perform capping without damaging the head face when a sheet clogging takes place. In addition, should an ink leakage occur while capping, the recording sheet is not stained.
- Fig. 6 illustrates the state of parts in the vicinity of free roller 8 when the main body of the apparatus is in standby.
- Recording guide 14 is not allowed to be in contact with free roller 8 unless there is external force to be exerted thereon. Accordingly, the contacting angle of recording sheet 1 to the periphery of free roller 8 is less in the standby state than in the printing state.
- the position of free roller 8 is established by the fact that the periphery of free roller 8 is pressed by platen pressing shafts 12a and 12b to be in contact with feed roller 7, and that the shaft of free roller 8 is in contact with through hole 13c, which is larger than the periphery of the aforesaid shaft by 0.1 mm - several mm, provided on each of platen side plates 13a and 13b.
- the aforesaid feed roller 7 and free roller 8 are made of plastic material such as rubber, etc. rolled around rigid shaft made of iron, etc.
- Fig. 7 illustrates recording head 38 being rotated clockwide with head shaft as its rotating center in order to shift itself from the standby state to recording state.
- head 38 is first rotated as described earlier by the driving power generated by motor KM, a plurality of projections provided on the recording face of head 38 are in contact with the top of recording guide 14 to cause recording guide 14 to begin resiliently deforming it.
- projection 38c provided on the recording face of head 38 is made to be increasingly higher towards the corner.
- recording guide 14 is deformed apart from recording head 38 by the height (8 in Fig. 7) of the aforesaid projection.
- the reason why the aforesaid projection 38c is arranged to be increasingly higher towards the coner is to make it easier to remove ink when the recording face of the head is wiped as described later.
- Recording head 38 is further rotated clockwise, and when recording head 38 is moved to be in the recording state as shown in Fig. 1, both ends of the recording face of recording head 38 are in contact with bearings 10a and 10b. Hence, the space between the recording face of recording head 38 and platen roller (free roller) 8 is established.
- the periphery of bearings 10a and 10b is made larger than that of free roller 8, and the volume thereof is set to be less than the height 6 of the aforesaid projection of recording head 38 by a 1/several mm thereof.
- guide 14 is reliably in contact with the periphery of platen roller 8 to convey the recording sheet.
- the aforesaid feed roller 7 is rotated clockwise, and platen roller 8 is rotated counterclockwise by the external force generated by the feed roller, at the same time, being moved in the direction towards the recording head 38.
- the aforesaid platen roller 8 is brought to contact with guide 14 through recording sheet. Therefore, the aforesaid springs 11 a and 11 are not necessarily needed here, and platen roller 8 can also be incon- tact with the guide only by its own weight.
- Recording head 38 mainly comprises head main body 38f including a heat generating section, electrical part section, and glass chamber section for containing liquid ink, front filter 38d and rear filter 38e arranged respectively at the outside of the head main body, and head front plate 38c. Also, front head ink connection 38d, and rear head ink connection 38e, are respectively provided for front filter 38d and rear filter 38e. These are tightly closed and connected respectively by front ink supply 71 and ink supply tube threading with sealing members (not shown) provided therebetween.
- a reference numeral 38a designates an imaginary two-dot chain line in Fig.
- nozzle 38a holes of several ten microns in diameter are provided, and the aforesaid holes are connected to ink supply tubes 71 and 72.
- ink supply tubes 71 and 72 are respectively connected to front supply tube joint 84 and rear supply tube joint 85.
- a reference numeral 38b designates the face where nozzle 38 is open, which is called orifice face.
- front head plate 38g is formed by metal or molding material, and the space between orifice face 38b and front head plate 38g is filled with silicon rubber, etc. to close them completely.
- Filters 38d and 38e are arranged to prevent dusts in ink from being flown into the nozzle section.
- Reference numerals 37a and 38b designate front and rear head arms made of engineering plastic, sintered metal, diecast metal, or the like, which has rigidity and resistivity against thermal deformation at high temperatures, and each of them is fixedly mounted on BJ head 38 by means of screw, etc.
- Front head arm 37a and rear head arm 37b are fixedly mounted on head shaft 36 by means of screw, etc., and with the structure as described earlier, head shaft 36 and BJ head 38 are fixed arranged.
- Head shaft 36 is rotatably supported by main body frame 56 through bearings (not shown). Head shaft 36 is connected to driving system comprising gears, belts KB, etc., and is further connected to stepping motor KM.
- cap 41 is formed by plastic material such as silicon rubber, etc. which has a high resistivity against mechanical creep as well as a high ratio of permeability for water vapor, etc.
- a reference numeral 42 designates a cap keel made of rigid material such as aluminum, stainless steel, etc., and as shown in a cross-sectional view in Fig. 10, short shafts 46a, 46b, 46c, 46d, and 46e are fixedly mounted on cap keel 42 by means of screws.
- Short shafts 46a - 46e should desirably be made of a corrosion-inhibiting and rigid material such as stainless steel, etc.
- short shafts 46a - 46e are fixed by screws, these can also be coupled by means of press fitting, bonding, or the like. Also, cap keel 42 and shafts 46a - 46e can be formed integrally by means of molding, etc.
- cap 41 is first made by coupling cap keel 42 and short shafts 46a - 46e as described above. Then, the coupled cap keel 42 and short shafts 46a - 46e are buried into an open forming die, and by putting silicon rubber, which is also the original material of cap 41, into the die or sandwiching silicon rubber between cap 41 and cap keel 42, these are integrally formed by burning into a one body.
- silicon rubber which is also the original material of cap 41
- the shape of the aforesaid forming die should match the external contour of cap 41 as a matter of course.
- a reference numeral 60 designates a recovery frame made of a corrosion-inhibiting rigid material such as stainless steel, and the four sides of recovery frame are bent to rise (60a - 60d) in order to enhance the rigidity.
- short shaft bearings 61a, 61 b, 61c, 61d, and 61 are fixed by screws, etc. (not shown) to receive short shafts 46a - 46e.
- the method for coupling bearings 61 a - 61 e with frame 60 may also be either welding or bonding.
- short shaft 46a is fitted into an elongated hole while short shafts 46b - 46d are fitted into the so-called loose holes, and short shaft 46e is fitted to perform positioning.
- each of the short shafts 46a - 46e has a same outer diameter, and the inner diameter 61e 1 , of short shaft bearing 61 e and the outer diameter of short shaft 46e are made to just fit each other.
- Short shaft bearings 61a - 61 are made of polyacetal resin having excellent slidability against stainless steel short shaft 46e.
- an elongated hole 61 a is formed for short shaft bearing 61 a against short shaft bearing 61 e in the longitudinal direction of cap 41. Then, the dimension of elongated hole 61a 1 in the transverse direction is formed to fit short shaft 46a.
- the diameters of holes 61b 1 , 61c 1 and 61d 1 opened in short shaft bearings 61 b, 61c, and 61 are respectively formed larger than the outer diameters of short shafts 46b - 46d within a rage of 0.1 mm - 1 mm.
- compression springs 47a - 47e are respectively held by screws from the reverse side of recording frame 60 with short shaft stoppers 56a - 56e sandwiched as shown in Fig. 9.
- Compression springs 47a - 47e are pressed between the cap keel and short shaft bearings 61 a - 61 e because the springs are held by screws. The movement of cap 41 at this juncture will be described later.
- first wiper 50 and second wiper 52 are made of plastic material such as rubber, etc. having a good abrasion resistance, and the straight portions of leading ends 50a and 52a of first and second wipers 50 and 52 are strictly controlled to maintain the straightness as well as to prevent wear and dust, etc. Also, the aforesaid first wiper 50 and second wiper 52 are respectively fixed to first wiper stay 49 and second wiper stay 51 by means of screws, etc. (not shown). First and second wiper stays 49 and 51 are both made of corrosion-inhibiting rigid metal such as stainless steel, etc.
- first wiper stay 49 and second wiper stay 51 are held on recovery frame 60 by screws, and the projection 41 a of cap 41, which will be described later, and the wiper leading ends 50a and 52a are arranged to accurately parallel themselves at this juncture.
- the aforesaid projection 41a, wiper leading ends 50a and 52a, and the mounting face of recovery frame 60 for wiper stays 49 and 51, and the imaginary two-dot chain line a in Fig. 9 connecting the center lines of boss sections 59a, and 59b, of front cam gear 59a and rear cam gear 59b are arranged to be in parallel accurately as described later.
- Fig. 9 the imaginary two-dot chain line a in Fig. 9 connecting the center lines of boss sections 59a, and 59b, of front cam gear 59a and rear cam gear 59b are arranged to be in parallel accurately as described later.
- the structure is formed to enable the height of the leading end 52a of second wiper against recovery frame 60 to be higher than that of the leading end 50a of first wiper against recovery frame 60.
- a reference numeral 54 designates a recovery frame bearing, and recovery frame shaft 55 shown in Fig. 1C (control cross-sectional view) is allowed to fit the elongated hole 54a of recovery frame bearing 54 in the transverse direction.
- recovery shaft 55 is fixed to main body frame 63, but recovery frame shaft 55 may also be supported rotatably by main body frame 63.
- Recovery frame shaft bearing 54 is made of polyacetal resin having a good slidableness and is fixedly screwed to recovery frame 60.
- Recovery frame bearing 54 is fixed against recovery frame 60 in the direction indicated by arrow in Fig. 9 at a position which enables the center of the depth of elongated hole 54a to be in the central part of recovery frame 60.
- the center of hole 61 ci of short shaft bearing 61 c is positioned in the central part of recovery frame 60 in the direction indicated by arrow ⁇ as shown in Fig. 9.
- the center of hole 61b 1 of short shaft bearing 61 b and that of hole 61d 1 of short shaft bearing 61 are symmetrically positioned in the direction indicated by arrow with short shaft bearing hole 61 ci as the center.
- the center of elongated hole 61a 1 of short shaft bearing 61 a in the direction indicated by arrow and the center of hole 61e 1 of short shaft bearing 61 are likewise positioned symmetrically in the direction indicated by arrow with the hole 61 c 1 as the center.
- a reference numeral 62 designates a recovery frame shaft which is arranged across both of the side plates of main body frame 63.
- This recovery frame shaft 62 is rotatably supported around a bearing (not shown) provided in main body frame 63.
- idler gears 57a and 57b are fixedly mounted respectively at positions inside the main body frame 63 and outside the front cap guide 48a and rear cap guide 48b which will be described later.
- Cam gears 59a and 59b are rotatably supported on cam gear shafts 70a and 70b fixed to main body frame 63 respectively at positions outside the cap guides 48a and 48b and inside the main body frame 63.
- the modules and number of teeth of gears 57a, 57b, 59a, and 59b are the same.
- gear 58 and gears 57a, 57b, 59a, and 59b are of the same number of teeth. Then, gear 58 is connected to stepping motor CM.
- the number of teeth thus arranged enables the gears engaged with cam gears 59a and 59b to rotate one round exactly the same as the cam gears completing one round, so that the rotational angles and positions of these gears are detected by a microswitch slit type sensor (not shown), etc. to detect the position of the boss section 59a, of cam gear 59a and the boss section 59b 1 of cam gear 59b.
- cap guides 48a and 48b are fixedly mounted in addition to these gears. Cap guides 48a and 48b are made of polyacetal resin having a good slidableness.
- grooves 48a, and 48b 1 are formed on cap guides 48a and 48b to fit the boss sections 59a, and 59b 1 of cam gears 59a and 59b in the transverse direction as shown in Fig. 10.
- boss section 59a, and boss section 59b 1 are arranged at positions just opposite to each other.
- recovery frame 60 Since the structure is of such as described above, recovery frame 60 performs rocking motion in the direction indicated by arrow X in Fig. 10 (central cross-sectional view) with recovery frame shaft 55 as the center when outer idler gear 58 is rotated. Now, since the vicinity of recovery frame 60 is constructed with the parts described as above, recovery frame 60 is positioned by the plane formed by two-dot chain line a and recovery frame shaft 55 as shown in Fig. 9. Here, two-dot chain line a and head shaft 36 are arranged to be accurately in parallel. Although recovery frame 60 is positioned by the plane formed by the aforesaid two-dot chain line a and recovery frame shaft 55, it is not fixed by the aforesaid structural members. Recovery frame 60 is structured to be flexible in the direction indicated by arrow ⁇ and by curbed arrow ⁇ in Fig. 9.
- first recovery cap guide 48a and second cap guide 48b are the direction indicated by arrow ⁇ in Fig. 9 towards recovery frame 60
- first and second cap guides 48a and 48b U letter type holes 48a, and 48b 1 are formed, and the space of U letter hole is precisely defined.
- the space of the aforesaid U letter holes 48a, and 48b 1 is indicated by arrow in Fig. 11.
- first and second cap guides 48c and 48b are arranged on recovery frame 60 to allow the center of the shorter width of projection 41 a (indicated by arrow in Fig. 11) of cap 41 to be placed in the center of the aforesaid space of U letter holes 48a, and 48b 1 .
- first head arm 37a and second head arm 37b circular projections 37a, and 37b 1 are formed respectively on front head arm 37a and rear head arm 37b. Then, the arranging positions of the aforesaid circular projection 37a, and 37b 1 are defined to allow the ink discharging ports of nozzle section 38a to be placed in the central position of the circular projection. Also, the diameter of the aforesaid circular projections 37a, and 37b 1 is formed to fit exactly the spaces of U letter holes on cap guides 48a and 48b.
- recovery frame 60 can be displaced in the direction indicated by arrows ⁇ and ⁇ (in Fig. 9) by the construction as described earier. Therefore, according to the present embodiment, even when there is a slight difference in the positions of the aforesaid U letter holes 48a, and 48b 1 and projection 37a, and 37b 1 at the time of fitting, recovery frame can fit them reliably while being guided by slant 48c and holes 48a, and 48b 1 to displace itself in the horizontal direction if only projections 37a, and 37b 1 are in contact with slant 48c of U letter holes 48a 1 and 48b 1 .
- cap 41 and front head plate 38c which will be described later, is performed naturally in this course of event. Also, even if recovery frame 60 approaches nozzle orifice face 38b with some inclination, projection 41 a and nozzle section 38a can approach each other with the face to face positional relationship.
- cap 41 cap keel 42, valve 43, valve cover 44, and waste ink tube will be described.
- Fig. 10 illustrates the state immediately after head 38 and cap 41 are in contact with each other.
- Fig. 11 illustrates the state when head 38 and cap 41 are parted.
- Fig. 12 illustrates the state when cap 41 is moved forwards head 38.
- Fig. 13 illustrates the state where projection 41 a closes nozzle 38a by pressure, and spring 47 is resiliently deformed.
- Fig. 14 illustrates the state where cap 41 is parted from head 38, and
- Fig. 15 illustrates the standby state.
- A is a side view observed from the location of side plate;
- B is a cross-sectional view in the transverse direction; and
- C is a cross-sectional view in the longitudinal direction.
- A is also a side view but B is a cross-sectional view in the longitudinal direction.
- Figs. 10A through 10C illustrate the state representing the moment cap 41 has come into contact with front head plate 38c. Cap 41 has not been deformed as yet.
- the cross-sectional shape of cap 41 is described in detail.
- the side portions of cap 41 are formed with inclination so as to widen the distance between them as the cap is raised upwards as shown in Fig. 10B.
- the inclined side portions are connected to the curbed portions indicated by mark a in Fig. 10B, and the thickness of the portions a are made thinner than the other portions as illustrated in Fig. 10B.
- the portions a are formed with a smooth curvature, these portions may also be formed in an abrupt edge.
- cap 41 in the transverse direction is formed to open itself towards the outside as it is raised upwards as in Fig. 10C.
- the cross-sectional shape of cap 41 in the transverse direction is formed in such a manner that the thickness of cap 41 contacting with front head plate 38c is made thicker than that of the cross-sectional shape of cap 41 in the longitudinal direction shown in Fig. 10B also contacting the aforesaid front head plate 38c.
- This is due to the fact that although the positioning of cap 41 against head 38 in the transverse direction is accurately performed, the positioning in the longitudinal direction is not performed accurately. Therefore, such construction as is the present embodiment may not be needed if only the positioning of cap 41 against head 38 is accurately performed in the longitudinal direction.
- the side portions of cap 41 are connected to curbed portions b which change its shape smoothly as in Fig.
- cap 41 in Figs. 10B and 10C is such that the thickness thereof becomes increasingly thinner smoothly towards as illustrated in these two figures.
- projection 41 a integrally formed with cap 41 is provided in the closed space in cap 41.
- the arranging position of projection 41 a is defined so as to allow the top of R shaped portion 41 c of projection 41 a to be located at a position against nozzle section 38a.
- the length of projection 41 a in the longitudinal direction at both ends is made longer than the entire length in which nozzle section 38a is arranged.
- through hole 41 b is provided on cap 41.
- the through hole 41 b in cap 41 is provided with through hole 41 provided on cap keel 42. Then, the aforesaid through hole 41 b, valve 43 is fitted.
- the aforesaid valve 43 being formed with plastic material, it can produce a state which is closed from the atmosphere without any pressure exerted on valve 43.
- the reason why valve 43 can properly function as a valve is that while cap keel 42 is formed with rigid material as described earlier, the contact face between valve 43 and cap keel 42 is formed excellent precision.
- valve cover 44 is mounted to enclose valve 43, and cap keel 42 and valve cover 44 are closedly fixed. Further, valve cover 44 is closedly coupled with wast ink tube 45.
- Cap 41 begins to approach recording head 38 from the state shown in Fig. 10 by the rotation of cam gears 59a and 59b in the direction indicated by arrow d in Fig. 10A.
- the sides of cap 41 begin to move in the directions indicated by arrow c in Fig. 10B and Fig. 10C while maintaining contact with front head plate 38c. This movement occurs because the sides of cap 41 are formed to open as the cap is raised upwards.
- cap 41 is moved in the direction indicated by arrows c due to the shape of cap 41. In addition to this, it is due to the increasing pressure in the closed space in cap 41 resulting from the reduction of volume of the closed space in cap 41. As the pressure in the closed space in cap 41 increases, valve 43 begins to open, and air in the closed space begins to flow from valve 43 and waste ink (not shown) begins to flow towards waste ink tube 45. Further, Fig. 12 illustrates the state where cam gears 59a and 59b have rotated in the direction indicated by arrow d.
- Fig. 12B the side of cap 41 is in contact with the rising portion of the edge of front head plate 38c and the movement in the direction indicated by arrow c in Fig. 10 is stopped.
- the side of cap 41 in the transverse direction shown in Fig. 12C is formed thinner than the thickness of the side in the longitudinal direction as described earlier. Therefore, its movement in the direction indicated by arrow c is stopped by the rigidity of the side itself.
- Fig. 12B the portions a of the sides of cap 41 are deformed as shown in Fig. 12B due to bending stress generated after the sides of the cap are in contact with the edges of front head plate 38c.
- the thick portions including the contacting faces of the sides of cap 41 receive buckling load, and the aforesaid portions a, being deformed to bend, are not buckled.
- compression spring 47a has not been pressed as yet.
- the cap 41 and the projection 41 a are integrally formed of an elastic material such as rubber.
- the cap 41 may be a member separate from the projection 41 a and the whole body of the cap 41 does not have elasticity.
- At least the head discharge port surface 38c and the contact section may be elastic and in this case a remaining upper part thereof may be of steel.
- FIG. 13 illustrates the state where compression spring 47a is deformed as the above describes, and boss sections 59a, and 59b, of cam gears 59a and 59b are positioned at the top.
- Fig. 13 there is almost no volume change in the closed space formed by the cap 41, and valve 43 only shows the state to close air. Therefore, the pressure in the closed space is equal to the atmospheric pressure.
- the state of each part when cam gears 59a and 59b are rotated from the state shown in Fig. 13 in the direction indicated by arrow e, will be described.
- cam gears 59a and 59b means the required movement of boss sections 50a, and 59b, from the top to the bottom or from the bottom to the top as shown in Fig. 13, and even if, for example, cam gears 59a and 59b are rotated in the direction reverse to that indicated by arrow e in Fig. 13, the movements described below should take place in the same manner.
- Fig. 14 the volume in the closed space in cap 41 is again increased and the pressure in the closed space becomes negative against the atmosphere, and valve 43 is closed as shown in Fig. 14. Therefore, in order to supplement the reduced volume in the closed space in cap 41, ink is discharged from nozzle section 38a of recording head 38. Ink remaining in nozzle section 38a is refleshed.
- FIG. 15 illustrates the pheripheral parts including cap 41 being in the standby state where an apparatus according to the present invention has not started performing operation such as recording, recovering, etc.
- the cam gears are at rest.
- the pressure in the closed space in cap 41 is identical to the atmospheric pressure. At this juncture, there is no force exerted on valve 43 either to open or close to valve 43. However, due to the shape of valve 43, water vapor in the closed space in cap 41 is not released into the atmosphere.
- Fig. 15D is a view showing another embodiment of guide member according to the present invention.
- V letter holes 48a 2 and 48b 2 are respectively formed, and the spaces in V letter holes are formed with excellent precision.
- first head arm 37a and second head arm 37b square projections 37a3 and 37b 3 are respectively formed, and the widths of the aforesaid projections are formed to fit exactly the spaces of the aforesaid V letter holes respectively.
- first head arm 37a 2 and second head arm 37b 2 are arranged to allow the leading ends of square projections thereof 37a3 and 37b 3 to mate respectively with V letter holes 48a 2 and 48b 2 when the projection of cap 41 is in contact with nozzle section 38a of head 38.
- recovery frame 60 enables the holes 48a 2 and projection 37a3 and the hole 48b 2 and projection 37b 3 to be mated reliably because the frame can displace itself in the directions indicated by 0 and y in Fig. 9.
- Fig. 15E is a view showing still another embodiment of guide member according to the present invention.
- first head arm 37a4 and second head arm 37b 4 U letter holes 37a 5 and 37b 5 are respectively formed, and the spaces of U letter holes are formed with excellent precision.
- first cap guide 48a and second cap guide 48b circular projections 48a3 and 48b 3 are respectively formed, and the widths of the aforesaid circular projections are formed to fit exactly the spaces of the aforesaid U letter holes.
- first head arm 37a4 and second head arm 37b 4 are arranged to allow the leading ends of U letter holes 37a 5 and 37b 5 to fit circular projections 48a3 and 48b 3 respectively when the projection of cap 41 is in contact with nozzle section 38a of head 38.
- recovery frame 60 enables the projection 48a3 and hole 37a 5 and the projection 48b 3 and hole 37b 5 to be mated reliably because the frame can displace itself in the directions indicated by arrows 0 and y in Fig. 9.
- This unit comprises an ink tank, ink tubes, an ink pump, etc. to keep ink and supply it regularly to a recording head and to remove bubbles generated in the tubes, etc., as well as anything that may clog nozzles.
- Fig. 16 is a view illustrating the concept of an embodiment according to the present invention.
- an ink cartridge cam prises recording head 38, ink pump 76, ink tank 86, wast ink absorber 96, and air duct 87 which is called breezer.
- ink pump 76 is actuated in a state where cap 41 is closely contacted with the recording head (a state shown in Fig. 13 where projection 41 a in cap 41 is in contact with nozzle section 38a of recording head 38) to circulate ink from ink cartridge 86 in the direction indicated by arrow E, so that the inside of the tubes including the inside of the recording head is filled with ink. At this time, some ink is flown out to cap 41, but it is returned to ink cartridge 86 through waste ink tube 45 and collected to built-in ink absorber 96.
- recording head 38 is ready to discharge ink.
- the ink pump used in the present embodiment is a pump which does not close the flow passage when the pump is at rest. Therefore, the ink supply at the time of discharging is carried out from both front and rear head ink couplers 38d and 38e.
- Breezer 87 functions as an air duct for this purpose.
- check valves capable of being opened by an extremely small difference in pressures are respectively arranged in both directions. Therefore, the valves function if a slight pressure, either negative or positive, is generated in the tank, and operate as air holes substantially.
- the valves are also arranged to control dust intrusion and evaporation.
- a reference numeral 92 designates a no-ink detector for detecting no-ink condition in tank 94.
- the detection is carried out in a manner given below.
- sensor 88 is arranged for detecting a light interruption.
- the recovery operation is an action to remove bubbles and cloggings which bender the normal discharging, and is performed in accordance with the recovery sequence, which will be described later, controlled by the recovery system.
- the recovery operation is exactly the same as the initial ink supply operation.
- ink pump 76 is actuated while cap 41 is in contact with recording head 38 (the current state is illustrated in Fig. 13) to circulate ink in the direction indicated by arrow A, so that bubbles are collected into the ink tank to release them to the outside through the breezer.
- the contacting condition between projection in cap 41 and nozzle 38a is released to drive the pump for the removal of any clogging in the nozzle.
- pressurized ink is flown into float chamber 90.
- float 89 is raised to closely contact with upper face of float chamber 90 to cover the passage to breezer 87. Therefor, no ink is flown into breezer 87.
- Fig. 17 is a perspective view showing the construction of supply and recovery systems, in which the structure of the present embodiment is actually employed.
- a reference numeral 73 designates the base of this unit which also functions as a base for installing ink cartridge 86, which will be described later.
- a reference numeral 74 designates a member called joint plate which is formed by fixing each of various passage couplers.
- cartridge guide 78 for positioning ink cartridge 86, cartridge joints 79a, 79b, and 79c for connecting tubes to release air, waste ink joint 81 for guiding waste ink produced at the time of recording to waste ink absorber 96 built in ink cartridge 86 through waste ink tank, air joint 80 for connecting the breezer for releasing air with air tube 83, first and second supply tube joints 84 and 85 for connecting first and second ink supply tubes 71 and 72 with ink pump 76 which is driven by pump motor 77.
- ink joint 79 connected to ink tank 94 accommodated in ink cartridge 79a provides three functional sections intensively, first ink supply section 79a, second ink supply section 79b, and air passage connecting section 79c, and with its structure, enables first ink supply inlet 95a, second ink supply inlet 75b and air inlet 95c to be coupled altogether, which are operationally related to the function of ink tank 94.
- the air passage section leading to the ink tank is formed by joints, thereby making it possible to construct the ink tank with hard resin material, to reserve a large quantity of ink without employing ink bags.
- an ink circulation passage is formed to perform ink supply from both of the ink supply regions at the time of recording and to circulate ink from the ink tank through the passage with the pump inbetween, and to circulate ink from the recording head to the ink tank again at the time of initial ink filling and recovery operation.
- the passage is formed by directly joining the tank and the supply passage, and further the air passage as described earlier, it becomes possible to eliminate, in spite of the ink tank being made of hard plastic resin, such function as a sub-tank which has conventionally been indespensable for a stable ink supply.
- these members are separately fixed to joint board 74, but the structure may also be such that these members are integrally formed with the joint board.
- flow passage board 75 is coupled with flow passage gloove 75a which functions as ink flow passage. In this portion, most of the ink flow passage pipings and connections are installed.
- joint section 79 which is annexed to joint board 74 connected to ink tank 94, it becomes possible to provide a structure thereby eliminating the operation related to ink passage 75a in that particular portion.
- a part of ink passage from ink tank 94 to the recording head can be formed only by coupling to the reverse side of joint board 79 the flow passage plate 75 which constitutes a flow passage.
- ink tank 94 built in ink cartridge 86 is flexibly accommodated in housings 93a and 93b which constitute the cartridge 86.
- ink passage from the ink tank without complicated piping arrangements simply by coupling joint board 74 and flow passage plate 75 to form the required flow passage.
- ink cartridge 86 there are accommodated in ink cartridge 86, the common housings 93a and 93b made of material having a good impact resistance, ink tank 94 made of resin having a good property against fluid and waste ink absorber 96 made of a water absorptive material having an excellent ink absorptive property such as felt or porous material.
- the ink supply and air releasing are performed by connecting these members with cartridge 79 on the side of joint plate 74 through joint section 95.
- the entire ink cartridge 86 is structured to be detachably installed as a whole on base 73 provided on the side of the apparatus.
- Figs. 19A and 19B illustrate the structure of this part further in detail.
- Fig. 19A is a partially cutaway cross-sectional side view showing the principal parts of ink cartridge main body 86.
- Fig. 19B is a partially cutaway cross-sectional view showing joint section 95 connected to the cartridge joint of the ink supply system.
- metal ball 99 is provided in joint section 95 to press it against joint opening 95a by the compression of spring 98.
- metal ball 99 is closely in contact with shealing rubber 101 to close the opening 95a of the joint section.
- ink tank has sloped surfaces or slants 94a, 94b at its bottom.
- slant 94a for gathering ink flow into joint section 95 from behind
- slant 94b for gathering ink flow into joint section 95 from the side of ink tank 94.
- Ink is supplied to the ink supply system through guiding tube 100 which is bent to be opened at the lowest bottom of the ink tank.
- a bottom support 93b supports the rear portion of the sloped surface 94a of the ink tank 94.
- ink tank 94 is held in housings 93a and 93b as shown in Fig. 20 with space 97 to allow the ink tank to move freely in an appropriate amount.
- ink tank 94 with spaces 97 (in this embodiment, for example about 1.0 mm) and spaces 97a (for example, about 1.0 - 2.0 mm) provided for both ends of ink tank 94 and by waste ink absorber 96 which is soft like felt.
- a projection 93d supports a front bottom of the ink tank 94.
- the joints 95a, 95b and 95c of the ink tank are provided about 0.5 mm lower with respect to the body joints 79a, 79b and 79c so that the ink tank 94 is connected to the body joints in a state which it floats about 0.5 mm to the body joints. Furthermore, in order to prevent any abnormal sound generated by the movement of ink tank 94 by vibrating impact, etc. or breakage of housing as well as to effectively utilize space, the central part of waste ink absorber 96 is removed as shown in Fig. 18 to allow the lowest bottom ink tank 94 to be fitted into the removed part, so that the ink tank is held by the remaining portion of circumference.
- Fig. 22 is a flowchart showing this operation.
- Figs. 23A through 23D are schematic views showing the system in operation.
- a unit comprising recording head 38, head arms, etc. is defined as head unit 65
- another unit comprising cap 41, wipers 50 and 52, recovery frame 60, etc. is defined as cap unit 65.
- Head unit 65 is rotatable with head shaft 36 as its rotating center while cap unit 64 is rotatable with recovery frame shaft 55 as its rotating center.
- the sequence of recovery operation will be described.
- cap unit 64 descends (this state is referred to as retracted position) (S22-3), and further head unit 65 is rotated as indicated by arrow G in Fig. 23B while cap unit 64 is rotated as indicated by arrow H in Fig. 23B to be in the wiping starting position (S22-4). Subsequently, head unit 65 is rotated as indicated by arrow I in Fig. 23C to clean off ink droplets, dusts, etc. on discharging port face 38b of the recording head with wipers 50 and 52 arranged in cap unit 64 (S22-5).
- FIG. 23C illustrates the state as indicated by arrow I where discharging port face 38b of the recording head is passing a first wiper, there are two wipers provided in the present embodiment. Therefore, when the cleaning off by a second wiper is terminated, cap unit 64 again descends to the retracted position as indicated by arrow J in Fig. 23D, and head unit 65 returns to the home position (S22-7). Then, finally, cap unit 64 ascends to the normal standby state as shown in Fig. 1 (S22-8) to complete the recovery operation.
- the cleaning in the present embodiment will additionally be described.
- the recording head employed for the present embodiment has discharging ports formed across the entire recording width of recording medium, i.e., the so-called full line type as described earlier.
- a discharging port face is extremely elongated as in the present embodiment, a sufficient cleaning cannot be performed with the use of one blade just for a one-time wiping. This is due to the difficulty in applying pressure by a blade equally all over the discharging port face, which is now too long for such a cleaning.
- blade 50 and 52 are employed to clean off the discharging port face sequentially to obtain reliability in cleaning action.
- the cleaning time can be shortened as compared with the case where a cleaning action is taken twice with one blade.
- the size of blade 50 which contacts the recording head first differs from the size of blade 52 which contacts it subsequently.
- the recording head rotates with head shaft 36 as its rotating center, and in order to place the leading end of the blade to be in contact with the discharging port face within the path of the recording head to move, it is necessary to define the length of each blade accordingly. Therefore, it is also possible to perform the required cleaning by driving the cap unit following the rotational movement of the recording head while making the length of each blades 50 and 52 the same or making the relational length of each of them reversed.
- each of plural blades contacting the rotating head 38 it is possible to vary the length I of the leading end of the blade contacting the discharging port face 38c of the head and/or the contacting degree 8 0 of each blade (Fig. 23E). Hence, it is possible to vary the force and area of each blade with which to contact discharging port face 38c to control possible splashing of adhered ink and dust on discharging port face 38c to the surrounding area at the time of cleaning off.
- each blade against discharging port face 38c is made greater sequentially following the order in which each of the blades are in contact with discharging port face 38c of the head, it becomes possible to allow the first blades to contact discharging port face 38c lightly when there are more ink or dusts adhered thereto, which should be cleaned off and the later blades to contact it sufficiently to clean off the remaining ink and dusts. Consequently, while controlling the possible splashing of ink and dusts adhered to discharging port face 38c to the surrounding area, it is possible to remove them completely.
- the rest of blades function as protective wall (Fig. 23C) to prevent the ink and dusts removed by the first blade from being splashed to surrounding area of the recovery system and eliminate the causes to stain the recording sheet or to electrically short circuit electronic circuit board.
- the number of the blades for cleaning it is not necessarily limit the number of the blades for cleaning to two as described above, but more blades can also be employed. Also, although in the present embodiment, the same material is used for both blades 50 and 52, a same material but of different properties or different materials may be used to improve the cleaning effect.
- the recording is started in a manner given below.
- a signal to start recording is received by the recording head at a step S24-1, the recording head at this juncture being in the standby state where only the cap covers the discharging port face of the recording head as shown in Fig. 15.
- the cap unit is retracted to the state in which the recording head and the cap are set apart as shown in Fig. 11, i.e., the retracted position.
- a preparatory discharging of several ejections to several hundred ejections is effectuated from the entire nozzles of the recording head.
- the cap unit and head unit are moved at a step S24-4 to constitute a starting condition of wiping action as shown in Fig. 23A.
- a step S24-5 a series of wiping action is performed as shown in Fig. 23B through 23D, and at a step S24-6, the recording unit is moved further to the recording position as shown in Fig. 1 where such state is held. After that, recording signals are sequentially inputted to carry out recording as desired.
- bubble sensor 103 for example, a transmitting sensor, etc.
- bubble sensor 103 is provided to enable detecting bubbles in ink supply tubes. Accordingly, it is possible to perform two different types of recovery operations, i.e., an automatic recovery to be carried out periodically each at a predetermined time, and an occasional recovery to be performed when bubble sensor 103 detects any incidental bubble or bubbles.
- the occasional recovery becomes possible with the installation of bubble sensor 103, and with this, the incidental non-discharging hitherto experienced can be reduced, thereby making it possible to improve the reliability of the apparatus.
- bubble sensors 103a and 103b are provided at either sides of up and down streams of ink flow towards the recording head at the time of circulation. Therefore, if no bubbles are detected by both of the bubble sensors, the recovery action is immediately suspended.
- bubble sensor 103b arranged at the down stream of ink flow at the time of circulation should detect a signal indicating that bubbles have been removed (no bubble presence), the ink pump is stopped after a while (a period required for the detected bubble exhausted to the tank from the current position of the sensor).
- Fig. 25 is a block diagram showing the recording unit according to an embodiment of the present invention.
- microcomputer (CPU) 101 controls the operation of the unit in accordance with the program stored in ROM 112 and data stored in RAM 113.
- Ink jet print head 102 performs recording by control (strobe) signals from CPU after data each for a one-line portion has been received from CPU.
- control strobe
- Drivers 103, 104, and 105 for each of pulse motors which will be described later, supply appropriate currents to drive the motors respectively in accordance with step instructions from CPU.
- Reference numerals 106, 107 and 108 designate respectively a motor (W motor) for conveying recording sheet, a motor (K motor) for transporting head, and a motor (C motor) for transporting cap unit.
- Head position detecting sensor 109 and cap position detecting sensor 110 detect the positions by means of on-off of microswitches, for example.
- a reference numeral 111 designates a bubble sensor.
- a motor (P motor) 115 for driving the ink pump is a DC motor which rotates with on.
- a driver (transistor circuit) 114 supplies current to turn on the P motor by a signal from CPU.
- W motor is driven for a required number of steps to convey recording sheet to a predetermined position (S26-2).
- cap is retracted to the retracted position (S26-4).
- C motor is driven for a predetermined number of steps, or is continuously driven until the moment sensor 110 detects that cap 41 has moved to the retracted position. Either methods are applicable (hereinafter the movement of head and cap are the same).
- the so-called empty discharging is performed by transmitting a predetermined number of strobe signals (S26-5) to head 38.
- head 38 is transported to the recording position.
- head 38 and wiper (cap unit 64) are transported to the starting position for wiping (S26-6 and S26-7), and by advancing head 38 to the recording position as it is, wiping is terminated (S26-8).
- cap 41 is returned to the retracted position (S26-9).
- the recording operation is executed by repeating the transmission of data each for a one-line portion to head 38, the transmission of strobe signals, the recording of the one-line portion (S26-10 and S26-11), and the driving of W motor to convey recording sheet for a one-line portion (S26-12) until the recording of a one-page portion is terminated.
- W motor is driven to exhaust recording sheet (S26-17) to terminate the recording operation.
- timer t i indicates a predetermined time T 1 (24 hours, for example), the recovery operation is started (S27-2).
- the recovery operation is performed as follows:
- P motor on signal is output to rotate P motor (S27-6).
- cap is transported to the retracted position (S27-12). Subsequently, after transporting head 38 to the starting position for wiping, cap 41 is transported to the wiping position (S27-13 and S27-14), and then wiping is performed (S27-15) by transporting head 38 to the position for terminating wiping (printing position). Cap 41 is again returned to the retracted position (S27-16) and to the capping position after head 38 has been returned to the standby position (S27-17). Then, the apparatus is again in the standby state.
- the present invention provides means for generating heat energy (for example, an electrothermal converter, a laser light, etc.) for the utilization of energy for ink discharging especially for ink jet recording method, and in a recording head and recording apparatus using a method to activate changes in a state of ink by utilizing the aforesaid heat energy, the present invention is particularly effective.
- heat energy for example, an electrothermal converter, a laser light, etc.
- this driving signal is made to be a pulse type, the growth and contraction of bubble can be effectuated instantaneously and appropriately, and it should be more preferable to employ such system because with it, a discharging of liquid (ink) having an excellent responsibility can be attained.
- a driving signal of the pulse type those disclosed in the specifications of, for example, U.S. Patents 4463359 and 4345262 should be suitable. In this respect, if conditions disclosed in the specification of U.S. Patent 4313124 concerning an invention of the ratio of temperature rise on the aforesaid thermal active face are employed, a further excellent recording can be performed.
- the present invention is effectively applicable to the recording head of a full line type with a length to cover the width of a maximum recording medium which can be recorded by the recording head.
- a structure in which a plurality of recording heads as disclosed in the above-mentioned specifications are combined to meet the requirements of such length or a structure in which one recording head, integrally formed, is adopted may be applicable, but the present invention displays the above-mentioned effects more efficiently.
- the present invention is effectively applicable to the installation in the main body of an apparatus either in the case of a recording head of chip type which is freely replaceable to enable the electrical connection with the main body of the apparatus or the ink supply from the main body of the apparatus or in the case of a cartridge type recording head which is integrally mounted in the recording head itself.
- recovery means for the recording head, preparative auxiliary means, etc. which constitute a recording apparatus according to the present invention because such addition makes the effects of the present invention more stable.
- These means are specifically capping means for recording head, wiping means, pressuring or absorbing means, electrothermal converter, or another heating element or preparative heating means by the combination of these elements, and aside from discharging for regular recording, it is also effective to effectuate a preparatory discharging mode for performing a stable recording.
- the present invention is extremely effective for a recording apparatus having at least one mode for recoloring with different colors or for full color with mixture of colors by the use of recording heads which are integrally structured into one head or by the combination of plural heads, not to mention the recording mode of principal color such as black, etc. as recording mode for a recording apparatus.
- the present invention is applicable to the use of ink having the property that the ink becomes fluid only by heat energy such as the one which can be discharged as liquid ink when it becomes fluid by the application of heat energy in response to recording signals or ink already becoming solidified at the time of reaching recording medium by utilizing positively the temperature rise caused by heat energy as energy to change the state of ink from solid to fluid for prevention or by using ink which is solidified when it is left for the purpose of preventing evaporation.
- ink can be held as liquid or solid state in a concave of porous sheet or through holes as described in Japanese Laid-Open Patent Application No. 54-56847 or Japanese Laid-Open Patent Application No. 60-71260, and is placed against the electrothermal converter in such mode.
- the performance of the above-mentioned film boiling method is most effective when each of the above-mentioned kinds of ink is employed.
- the mode of an ink jet recording apparatus according to the present invention is such that in addition to facsimile apparatus having receiving and transmitting functions as in the present embodiment, it can be used as image output terminal for information processing apparatus such as computer, etc, copying apparatus combined with reader, etc. or the like.
- a recording head is used for the recovery operation by circulation with ink supply tubes arranged at both ends respectively, but the present invention is also applicable to a recording head of such type that it has only one ink supply tube and performs recovery operation by suction from the front face of nozzle as a matter of course. It is also possible to reduce manufacturing cost by forming bubble sensor integrally with the constituents of the head.
- the present invention it is possible to remove ink adhered to orifice face by a plurality of cleaning members, so that ink can be removed completely. It is further possible according to the present invention to remove effectively ink strongly adhered to the orifice face by the plural cleaning members each having different contacting area, contacting angle, and contacting position provided by different sizes of the cleaning members.
- the ink container relating to three flow paths was explained as a sample, but it is possible to remove any extra backlash, by limiting the degree of freedom in a certain direction depending on the construction or number of the flow paths.
- the engagement of the container with the device is made only with the cylindrical portion at the periphery of the joint portions, but if such cylindrical portion for the engagement is changed in number or shape (for example to a polygonal or elliptic cylinder shape), then it is possible to reduce an extra degree of freedom after the mounting, and improve the stability of the seal for the connecting portion.
- the above-mentioned embodiment is so constructed that three connections relating to the communicating port to the air, the supplying side to the recording head at the time of the ink circulation and the returning side, respectively are made, but in order to achieve more effectively the removal of the babbles due to the ink circulation by decreasing the flow path resistance, correspondingly to the structure of the recording head, more supplying tubes may be used. At that time, it is possible to divide the supplying side and the returning side to plural ones, respectively, by applying thereto the above-mentioned embodiment.
- the structure in which the waste ink absorbing body is positioned on the bottom of the ink tank was explained.
- the soft member positioned at the bottom of the ink tank are used to have the waste ink and mechanical shock absorbing functions, but it is possible to achieve the similar effect to the above even when an additional member with a superior shock absorbing capability, etc. is provided separately to said soft member, or the frame itself is formed with a soft material.
- the recording head having at its both ends the supplying tubes and carrying out the recovery operation by the circulation is used, but this invention may be applied to a recording head having one supplying tube and of which recovery operation is carried out by suction from the front face of the nozzle. Also, it is possible to decrease the cost by forming both of the babble sensor and the recording head in a body.
- the ink jet recording apparatus is provided in which easy registration in position of the joint portion of the ink supplying side to the joint portion of the cartridge side is accomplished so that the ink cartridge is surely mounted.
- the ink jet recording apparatus which has the reliable joint portions from which any ink leakage due to vibration or shock does not occurred.
- three connections for the paths for supplying ink at the time of the circulation, the returning path and the communicating port to the air are used detachably between the ink tank side and the joint sides, and thus, it is possible to provide the ink supplying device which is voluminous, and strong in vibration and shock and which has no use for the sub-tank.
- the ink jet recording apparatus having the ink supplying device which is low-priced, compact and moreover highly reliable. Also, in the above-mentioned embodiments, by not only holding the ink tank at its periphery with a soft member and but also using such soft member as the waste ink absorbing body, it is possible to, achieve an ink cartridge which is strong in vibration and shock, which can use effectively the space and which is compact and low-priced. In this connection, it is also possible to provide the ink jet recording apparatus which is miniaturized and has its decreased running cost and improved reliability.
- an ink jet recording apparatus in which by controlling the operation of the ink pump using the means for sensing a babble in the ink supplying paths, the recovery operation can be reduced in frequency and time to minimum necessary values, the volume of waste ink can be decreased and the number of the recording papers which are recorded with a predetermined amount of ink can be increased, and, thus, its running cost can be reduced.
- An ink cartridge adapted to be loaded detachably to an ink jet recording apparatus for preforming a recording on a recording medium by discharging ink comprises an ink tank for accommodating ink therein, leading-out means for leading out ink within said ink tank to the outside, said leading-out means being provided on said ink tank, and a frame for supporting displaceably said ink tank on which said leading-out means is provided.
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Abstract
Description
- The present invention relates to an ink supplying device and an ink jet recording apparatus having such ink supplying device.
- Recently, it has been recognized that an ink jet recording apparatus is excellent in that it can perform a high speed recording since a noise during the recording is very small and it can be easily constructed as a high density multiple discharge port type ink jet printer. Further, it has been interested in that the ink jet printer has good color reproducibility for a color image. In general, an ink jet recording system (ink jet recording apparatus) is so constructed that ink droplets are caused to be discharged and fly from a discharge port of a recording head, and recording is carried out with their sticking on a recording sheet. So, in the ink jet recording apparatus, it is needed to supply surely ink to the ink jet recording head. In the past, various contrivances have been made for this purpose.
- Hereinafter, its several examples and related problems will be explained. First, an example which employs an exchangeable ink tank is described. In the past, there have been developed many arrangements which are provided with a cartridge type ink tank in the ink jet recording apparatus permitting easy supplement of ink by exchanging the ink tank by a user when ink has been lost. As for the cartridge, type ink tanks, an arrangement is widely known wherein it is provided with a flexible bag which accommodates ink therein and which is caused to have both of opening to the air pressure and evaporation preventing at the same time, as shown in Japanese Laid-Open Patent Application No. 56-41148, for example. This arrangement is very effective as means for forming a low-priced and compact ink tank since it need no additional complicated mechanism for communicating to the air.
- Also, as for positioning and alignment means for a joint part for conducting out ink from the ink tank, a method is known of obtaining a sure connection of the flow path with the connecting portion of the ink cartridge side by causing the member of the device side to have a degree of freedom, as shown in Japanese Patent Laid-Open Application No. 60-137658.
- However, in the above-mentioned prior art connecting arrangement, it can be easily constructed in a case where the flow path to be connected is one, but in an arrangement having a plurality of flow paths or connecting portions, moving parts at the device side must be large in size, or its construction becomes very intricate, and thus, in a case where a plurality of ink paths are used, for example, seal portions for connecting portions between the joint portions of the device body which are movable and the ink paths to the recording head must be increased in number, or distribution of tubes forming the ink paths would become complex.
- On the other hand, the above-mentioned cartridge type ink tank arrangement is weak in vibration and shock because it holds ink with a soft bag, and if the manners in which the bags collapse are nonuniform, then the pressure with which ink is let to flow would be often caused to change. Accordingly, this arrangement is not suitable to a large volume ink tank, and in fact it is realized as a relatively small ink tank.
- In order to overcome the above problems, an ink tank shown in Japanese Laid-Open Patent Application No. 56-13456, for example has been developed, which has a construction which is strong in vibration and shock and permits it to be voluminous by holding ink between the outside of the bag which communicates to the air and a frame. However, the problem relating to the change of the pressure with which ink flows out, which is due to a difference between the manners in which the bags collapse (or swell) is not solved entirely, and it is needed to cause ink to flow out compulsively with an ink pump, store ink temporarily in a sub-tank which is provided with special means communicating to the air and then supply it to the head, so as thereby to carry out stabilized ink supplying.
- Moreover, an ink cartridge is also known having its construction wherein a waste liquid absorbing body is added to the ink tank of the above-mentioned arrangement and the ink tank and a waste liquid tank are made to be in a body by enclosing them with a frame, between which a member intervened. In the ink cartridge of this type, as the waste liquid absorbing body, in general, felt or foaming resin, etc. is used to hold therein waste ink for the collection thereof. However, in this prior art, such a problem would be produced that in the case where, for example, the weight of the ink tank with ink filled up is larger than that of the waste liquid tank, rubbing is produced between the ink tank and the frame enclosing it, and specially, if the tank is made in the form of a rigid container having the means communicating to the air rather than the bag, then because of backlash between the tank and the frame, a noise would be generated at the time of the application of vibration and a damage would occur at the time of the application of shock.
- Accordingly, an object of the present invention is to provide an ink supplying device wherein recording can be continued suitably, and an ink jet recording apparatus using this ink supplying device.
- A further object of the present invention is to provide an ink supplying device wherein ink can be supplyed suitably, and an ink jet printing apparatus using this ink supplying device.
- Another object of the present invention is to provide an ink supplying device wherein connection between an ink cartridge and the device body can be carried out easily and reliably, and an ink jet printing apparatus using this ink supplying device.
- Still another object of the present invention is to provide an ink supplying device wherein the protection for an ink cartridge is made surely, and an ink jet recording apparatus using this ink supplying device.
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- Fig. 1A is a cross-sectional side view showing a facsimile apparatus to which an embodiment of the present invention is applied.
- Fig. 1B is a top plan view of the apparatus shown in Fig. 1A.
- Fig. 2 is a cross-sectional side view showing the state where the apparatus shown in Fig. 1A is opened.
- Fig. 3 is a perspective view showing the vicinity of a platen roller.
- Fig. 4 is a perspective view showing an exhaust sheet roller.
- Fig. 5 is a perspective view showing a recording frame.
- Fig. 6 and Fig. 7 are side views showing the vicinity of a recording head.
- Fig. 8 is a perspective view showing the recording head.
- Fig. 9 is a perspective view showing the vicinity of a cap.
- Figs. 10A - 10C are views showing the state immediately after the head and the cap are in contact with each other.
- Figs. 11 A and 11B are views showing the state where the head and the cap are apart from each other.
- Figs. 12A - 12C are views showing the state where the cap is being moved towards the head.
- Figs. 13A - 13C are views showing the state where a projection presses a nozzle to be tightly closed while a spring resiliently deformed.
- Figs. 14A - 14C are views showing the state where the cap is being parted from the head.
- Figs. 15A - 15C are views showing the standby state of the cap.
- Fig. 15D is a view showing a guide member according to another embodiment of the present invention.
- Fig. 15E is a view showing a guide member according to still another embodiment of the present invention.
- Fig. 16 is a typical view schematically showing a structural example of the ink supply passage of an ink jet recording apparatus according to the present invention.
- Fig. 17 is a perspective view showing a structural example of ink supplying means of an ink jet recording apparatus according to the present invention.
- Fig. 18 is an exploded perspective view showing an structural example of an ink cartridge installed in an ink jet recording apparatus according to the present invention.
- Figs. 19A and 19B are a partially cutaway sectional side view showing the structural example of the ink cartridge and a partially enlarged view thereof to show the state of mating with the ink supplying means.
- Fig. 20 is a partially cutaway sectional front view of the structural example of the ink cartridge.
- Fig. 21 is a schematic top view showing the structural example of the ink cartridge.
- Fig. 22 is a flowchart showing an example of sequential recovery applicable to an ink jet recording apparatus according to the present invention.
- Figs. 23A - 23D are schematic side views sequentially showing the recovery operation.
- Fig. 23E is a typical view showing the contacting amount and contacting angle of the leading end of a blade being in contact with the face of a discharging port.
- Fig. 24 is a flowchart showing an example of the sequence from the standby state to the recording state.
- Fig. 25 is a block diagram showing a recording unit according to an embodiment of the present invention.
- Fig. 26 is a flowchart showing an operation at the time of recording according to an embodiment of the present invention.
- Fig. 27 is a flowchart showing a recovery operation according to an embodiment of the present invention.
- Research was made by the inventors of this invention to resolve the above-mentioned problems raised in the prior art, and as a result thereof, it could be found that with such a construction that connecting portions of the device side are stationary and the corresponding connecting portions of the ink cartridge side are movable, the connection therebetween can be carried out suitably. The present invention which will be explained hereinafter was made on the bases thereof, and relates to a ink jet recording apparatus comprising ink supplying means for permitting the supply of ink to an ink jet recording head and an ink cartridge detachably mounted on said ink supplying means and providing with an ink tank accommodating therewithin ink to be supplied, said ink supplying means having a stationary ink supplying side joint portion adapted to be connected to said ink tank, said ink tank within said cartridge having an ink tank side joint portion connected to said ink supplying side joint portion and supplying ink, and said ink tank having a freedom of motion in the rotation direction with respect to the central axis of its joint portion to permit said ink tank to displace when said ink supply side joint portion and said ink tank side joint portion are connected to each other.
- In accordance with this invention, the ink container is retained movably within the frame enclosing it, specially in the direction of its rotation with respect to the central axis of the connecting portion (joint portion), and thus, a freedom in connection of the connecting portion of the device side and the corresponding connecting portion of the ink cartridge side is easily secured, and even though there are provided a plurality of flow paths to be connected, the positioning of the device side joint portions to the ink container side joint portion is made easily and surely.
- Also, since the joint portion of the device side (ink supplying means side) is made to be stationary, the distribution of the ink tube form here to the recording head can be made to be compact and simple.
- Further, the inventors of this invention studied a construction with which ink is supplied suitably from a voluminous ink tank to the recording head directly without the use of any sub-tank, and as a result thereof, obtained a construction defined by the following. That is, this invention relates to in an ink supplying device having a plurality of ink paths adapted to be connected to an ink jet recording head, joint means comprising a first ink coupling portion connected to said ink jet recording head through an ink pump, a second ink coupling portion different from said first ink coupling portion and connected to said ink jet recording head, and a connecting portion for performing communication to the air, whereby an ink tank with said portions is detachably mounted to said ink jet recording head.
- Therefore, in accordance with the above mentioned construction, the ink supply can be carried out very suitably without the use of not only the ink bag but also the sub-tank since the ink supporting port is jointed directly to the member constituting the ink supplying path. Also, since the port of the ink tank opening to the air is joined to the connecting portion for performing the communication to the air so that the ink tank can be caused to communicate to the air, it is possible to provide the ink tank which does not request that it be in the form of the above-mentioned bag arrangement, which is strong in vibration and shock and which is voluminous. avoidable that the recording becomes inactive under a predetermined number of recording papers.
- Hereinafter the present invention will specifically be described in accordance with embodiments.
- Fig. 1A is a central sectional view showing an embodiment of facsimile apparatus characteristically representing the present invention. Fig. 1 B is a top plan view thereof, and Fig. 2 is a cross-sectional view showing the apparatus in an open state. The facsimile apparatus of the present embodiment roughly comprises original conveying system A, optical system B, power source unit C, electric circuit board D, recording sheet conveying system E, decurling system F, ink supply system G, and recovery system H. Here, aforesaid original conveying system A and optical system B constitute an original reading unit for reading original images. Then, as the basic action of a facsimile apparatus, when an original 2 is set for transmitting or copying, original coveying system A conveys the aforesaid original 2 sequentially by a roller train (rollers R1, R2, R3, and R4) driven by driving means (not shown) in order to read the original image of original 2. Thus, the original line information is transferred by condenser lens Le to line
CCD 100 through the reflective optical path of optical system B (lamp L1, mirrors M1 and M2) from a given position for reading the original line (main scanning line) in the course of its conveyance, and is converted into electrical signals for the reading of the original information. At the time of receiving or copying, recording sheet conveying system E sequentially conveys recording sheet, which is wound in roll, by a roller train driven by driving means (not shown) to a passage shown in Fig. 1, and recording is performed in the course thereof by discharging ink from discharging ports ofrecording head 38 onto a given recording line of the recording sheet. Ink is discharged from the discharging ports ofrecording head 38 with the utilization of heat energy. This heat energy is generated by an electric heat converter provided inrecording head 38. In this respect, power source unit C received a normal AC to convert it into all the necessary voltage currents and supplies them respectively to each of the units of the apparatus. The electric circuits with electric circuit board D at its center controls the functional operation of each unit of this apparatus mainly with a cimcrocom- puter system provided. It also performs the connection and disconnection with transmission line as well as the input and output of image information signals. Ink supply system G supplies ink to the recording head, and recovery system H performs the cleaning and capping of the face of discharging ports, which are needed for the maintenance of the head. - In this respect, as shown in Fig. 1 B, rolled
recording sheet 1 is positioned almost in the center of the apparatus, and on the left-hand side thereof, original conveying system A, optical system B, and power source unit C are arranged in the vertical direction, and on the right-hand side thereof,recording head 38, record head recovery system H, and ink supply system G withink tank 86 are arranged sequentially in that order from the above. Since recordinghead 38, recording head recovery system H, and ink supply system G are thus arranged sequentially from the above, the ratio of pressure variation ofink tank 86 against the orifice face ofrecording head 38 is reduced (i.e., the pressure against each of the discharging ports is equalized) even if the apparatus is inclined according to the present embodiment, and an excellent recording can be performed. This is due to an arrangement such that despite the miniaturization of the apparatus, the space between the orifice face of recording head and theink tank 86 is made greater. - Hereinafter, each structure of recording head and operation will be described following its operational sequence.
Rolled recording sheet 1 is installed, and is pinched by drivingfeed roller 7 and free roller (platen roller) 8 which is in contact with said drivingroller 7 through decurling system F for straightening out the curl formed on thisrecording sheet 1.Feed roller 7 is driven by driving means (not shown) with, for example, a stepping motor as its power source. - Here, Fig. 3 is a perspective view showing parts arranged in the longitudinal direction in the vicinity of free roller 8 (platen roller). A first
platen side plate 13a and a secondplaten side plate 13b fixed to or integrally formed withrecording frame 19 supportfree roller 8 with a play in such a manner that the shaft of the free roller is penetrated through theopening 13c provided each of the side plates, having a larger diameter than that of the shaft. The E rings 29 and 30 are fixed respectively at both ends of the shaft offree roller 8 as locks and further, on both shaft parts offree roller 8,bearings free roller 8 to enable it to be freely rotated. In the meantime, the aforesaid firstplaten side plate 13a and secondplaten side plate 13b are slidably arranged each with the respectiveplaten pressure shaft springs platen pressure shafts bearings free roller 8 respectively to exert pressure against each of them. - Now, reverting to Fig. 1,
recording head 38 is at the recording position. At this juncture,free roller 8 is positioned by being in contact in two directions withfeed roller 7 by the pressure exerted byfree roller 8 as well as withrecording head 38 by contacting theaforesaid bearings platen pressure shafts free roller 8 are exerted, is set towards the direction thatfree roller 8 is in contact withfree roller 7 and thatbearings recording head 38. At the same time,recording guide 14 made of thin plastic plate guides theaforesaid recording head 38, so that the recording head is rotated to the recording position withhead shaft 36 as its rotational center. - Thus, the sheet path is matched with the recording line position, and
recording head 38 discharges ink from its discharging ports onto the aforesaid recording line position for recording at the time of recording. - Next,
recording sheet 1 is pinched by firstexhaust sheet roller 21 and theroller train 17a - 17g androller train 18a - 18g which are in contact with the aforesaid firstexhaust sheet roller 21 to be conveyed while being guided by first curvature guide 15 and first exhaust sheet guide 20. - In this respect, the aforesaid first
exhaust sheet roller 21 is driven by the driving system of the same power source asfeed roller 7, and is so arranged that the peripheral speed of the aforesaid firstexhaust sheet roller 21 is slightly faster than that of theaforesaid feed roller 7. - Here, Fig. 4 is a perspective view showing the parts arranged in the longitudinal direction in the vicinity of first
exhaust sheet roller 21.Rollers 17a - 17g androller 18a - 18g are arranged alternatively with first curvature guides 15a - 15f. Each of them is rotatably supported byshaft 31 andshaft 32 and both ends of the shafts are locked by E rings, etc. Also, at both ends,shaft 32 is regulated by receiving side 9a of the first exhaust sheet rollers, which is fixed to or integrally formed withrecording frame 19 and receivingside 19b of the second exhaust sheet rollers, and also in the horizontal direction, the shaft is regulated at both ends thereof by the vertically elongated through holes having the diameter fitted to that ofshaft 32, through which the shaft is penetrated. The both ends of the shaft are also locked by E rings (not shown), etc. In this respect, compression is generated bysprings 16a - 16f represented only by areference numeral 16a in Fig. 4 forrecording chassis 19 and first curvature guides 15a - 15f (refer to Fig. 1) to causerollers 17a - 17g androller 18a - 18g to be in contact withexhaust sheet roller 21 by pressure. As a result, when recordingsheet 1 is pinched thereby, the power to convey the recording sheet is generated. Then, recordingsheet 1 is guided to upperexhaust sheet guide 23 and trailingexhaust sheet guide 24 through the space between bothedges exhaust sheet roller 25 and the rollers 27a - 27g androllers 28a - 28g which are in contact therewith. In this respect, secondexhaust sheet roller 25 is also driven by the driving system in such a manner that the peripheral speed thereof is set at a speed slightly faster than that of the aforesaidfirst roller 21. Here, too, as in the vicinity of the aforesaid firstexhaust sheet roller 21, rollers 27a - 27g androllers 28a - 28g are arranged alternately with second curvature guides 26a - 26f and are rotatably supported respectively byshaft 33 andshaft 34. Then, both ends ofshaft 34 are locked with E rings, etc.Shaft 33 is regulated at both ends thereof by exhaust sheet roller receiving sides 19c and 19d fixed to or integrally formed withrecording frame 19, having vertically elongated holes fitted respectively to the diameter ofshaft 33, through which both ends of the shaft are penetrated horizontally. The ends thereof are also locked by E rings, etc. Withsprings 35a - 35f, compression is generated betweenrecording frame 19 and second curvature guides 26a - 26f (refer to Fig. 1) to cause rollers 27a - 27g androllers 28a - 28g to be in contact with secondexhaust sheet roller 25 by pressure, so that when recordingsheet 1 is pinched thereby, the conveying power is generated. In this way, the recording sheet is exhausted after recording has been completed, and is further conveyed byexhaust sheet roller 39 in the form of being cut into the unit of one page while the leading and thereof is being held smoothly bystacker 40. As a result, an operator can take out the recording sheet thus stacked onstacker 40. - As the above describes, the recording sheet conveying system is structured to carry out its operation. Here, Fig. 1 shows the state of the system at the time of recording, and at the time of replacing the recording sheets or troubleshooting in conveying recording sheet,
recording frame 19 can be opened or closed withhinge 19e ofrecording frame 19 as its pivoting point. In other words, as shown in Fig. 2, the recording frame can be opened just along the recording sheet conveying path as its boundary, and the arrangement is designed to place each of the components belonging torecording frame 19 above this boundary and each of those belonging tomain body frame 63 below the boundary. Thisrecording frame 19 and the assembly of its components thereon are shown in Fig. 5. - As set forth above, in the present embodiment,
recording head 38, recording head recovery system H, and ink supply system G are sequentially arranged from the above in that order. Thus,recording sheet 1 is guided in the horizontal direction above recordinghead 38 after the recording has been completed by recordinghead 38, and is further conveyed downwards thereafter toexhaust sheet stacker 40 for stacking. Here, the path through which the aforesaid recording sheet is being guided in the aforesaid horizontal direction forms the aforesaid boundary along which the main body is opened. Therefore, according to the present embodiment, it is easy to remove a clogged sheet if any clogging should occur, and further, it is possible to perform capping without damaging the head face when a sheet clogging takes place. In addition, should an ink leakage occur while capping, the recording sheet is not stained. - Next, the positioning of free roller 8 (platen roller) will be described.
- First, Fig. 6 illustrates the state of parts in the vicinity of
free roller 8 when the main body of the apparatus is in standby. Recordingguide 14 is not allowed to be in contact withfree roller 8 unless there is external force to be exerted thereon. Accordingly, the contacting angle ofrecording sheet 1 to the periphery offree roller 8 is less in the standby state than in the printing state. At this juncture, the position offree roller 8 is established by the fact that the periphery offree roller 8 is pressed by platenpressing shafts feed roller 7, and that the shaft offree roller 8 is in contact with throughhole 13c, which is larger than the periphery of the aforesaid shaft by 0.1 mm - several mm, provided on each ofplaten side plates aforesaid feed roller 7 andfree roller 8 are made of plastic material such as rubber, etc. rolled around rigid shaft made of iron, etc. - Next, Fig. 7 illustrates
recording head 38 being rotated clockwide with head shaft as its rotating center in order to shift itself from the standby state to recording state. Whenhead 38 is first rotated as described earlier by the driving power generated by motor KM, a plurality of projections provided on the recording face ofhead 38 are in contact with the top of recordingguide 14 to causerecording guide 14 to begin resiliently deforming it. Here,projection 38c provided on the recording face ofhead 38 is made to be increasingly higher towards the corner. Thus, recordingguide 14 is deformed apart from recordinghead 38 by the height (8 in Fig. 7) of the aforesaid projection. - The reason why the
aforesaid projection 38c is arranged to be increasingly higher towards the coner is to make it easier to remove ink when the recording face of the head is wiped as described later. - Recording
head 38 is further rotated clockwise, and when recordinghead 38 is moved to be in the recording state as shown in Fig. 1, both ends of the recording face ofrecording head 38 are in contact withbearings recording head 38 and platen roller (free roller) 8 is established. In the present embodiment, the periphery ofbearings free roller 8, and the volume thereof is set to be less than the height 6 of the aforesaid projection ofrecording head 38 by a 1/several mm thereof. Thus, guide 14 is reliably in contact with the periphery ofplaten roller 8 to convey the recording sheet. Here, at the time of recording, theaforesaid feed roller 7 is rotated clockwise, andplaten roller 8 is rotated counterclockwise by the external force generated by the feed roller, at the same time, being moved in the direction towards the recordinghead 38. Hence, with the structure described earlier, theaforesaid platen roller 8 is brought to contact withguide 14 through recording sheet. Therefore, the aforesaid springs 11 a and 11 are not necessarily needed here, andplaten roller 8 can also be incon- tact with the guide only by its own weight. - Next, using the perspective view shown in Fig. 8, the structures of peripheral parts of
recording head 38 will be described. Recordinghead 38 mainly comprises headmain body 38f including a heat generating section, electrical part section, and glass chamber section for containing liquid ink,front filter 38d andrear filter 38e arranged respectively at the outside of the head main body, and headfront plate 38c. Also, fronthead ink connection 38d, and rearhead ink connection 38e, are respectively provided forfront filter 38d andrear filter 38e. These are tightly closed and connected respectively byfront ink supply 71 and ink supply tube threading with sealing members (not shown) provided therebetween. Areference numeral 38a designates an imaginary two-dot chain line in Fig. 8 to represent the straight line formed by connecting the center lines of the nozzles aligned. A plurality of nozzles are aligned in order to form image on a recording material across the entire width thereof in the direction of main scanning. Hereinafter, these are referred to asnozzle 38a. In practice, however, holes of several ten microns in diameter are provided, and the aforesaid holes are connected toink supply tubes ink supply tubes reference numeral 38b designates the face wherenozzle 38 is open, which is called orifice face. In this respect,front head plate 38g is formed by metal or molding material, and the space betweenorifice face 38b andfront head plate 38g is filled with silicon rubber, etc. to close them completely.Filters Reference numerals BJ head 38 by means of screw, etc.Front head arm 37a andrear head arm 37b are fixedly mounted onhead shaft 36 by means of screw, etc., and with the structure as described earlier,head shaft 36 andBJ head 38 are fixed arranged.Head shaft 36 is rotatably supported by main body frame 56 through bearings (not shown).Head shaft 36 is connected to driving system comprising gears, belts KB, etc., and is further connected to stepping motor KM. - Next, using the perspective view shown in Fig. 9, the structure of peripheral parts of
cap 41 will be described. Although the shape ofcap 41 will be described later in detail later,cap 41 is formed by plastic material such as silicon rubber, etc. which has a high resistivity against mechanical creep as well as a high ratio of permeability for water vapor, etc. Areference numeral 42 designates a cap keel made of rigid material such as aluminum, stainless steel, etc., and as shown in a cross-sectional view in Fig. 10,short shafts cap keel 42 by means of screws.Short shafts 46a - 46e should desirably be made of a corrosion-inhibiting and rigid material such as stainless steel, etc. In the present embodiment, althoughshort shafts 46a - 46e are fixed by screws, these can also be coupled by means of press fitting, bonding, or the like. Also,cap keel 42 andshafts 46a - 46e can be formed integrally by means of molding, etc. - Here, the formation of
cap 41 is first made bycoupling cap keel 42 andshort shafts 46a - 46e as described above. Then, the coupledcap keel 42 andshort shafts 46a - 46e are buried into an open forming die, and by putting silicon rubber, which is also the original material ofcap 41, into the die or sandwiching silicon rubber betweencap 41 andcap keel 42, these are integrally formed by burning into a one body. Here, the shape of the aforesaid forming die should match the external contour ofcap 41 as a matter of course. Now, areference numeral 60 designates a recovery frame made of a corrosion-inhibiting rigid material such as stainless steel, and the four sides of recovery frame are bent to rise (60a - 60d) in order to enhance the rigidity. Torecovery frame 60,short shaft bearings short shafts 46a - 46e. In this respect, the method forcoupling bearings 61 a - 61 e withframe 60 may also be either welding or bonding. Also, as described later,short shaft 46a is fitted into an elongated hole whileshort shafts 46b - 46d are fitted into the so-called loose holes, andshort shaft 46e is fitted to perform positioning. In other words, each of theshort shafts 46a - 46e has a same outer diameter, and theinner diameter 61e1, of short shaft bearing 61 e and the outer diameter ofshort shaft 46e are made to just fit each other.Short shaft bearings 61a - 61 are made of polyacetal resin having excellent slidability against stainless steelshort shaft 46e. - As shown in Fig. 9, an
elongated hole 61 a, is formed for short shaft bearing 61 a against short shaft bearing 61 e in the longitudinal direction ofcap 41. Then, the dimension ofelongated hole 61a1 in the transverse direction is formed to fitshort shaft 46a. The diameters ofholes short shaft bearings short shafts 46b - 46d within a rage of 0.1 mm - 1 mm. Then, at the outside ofshort shafts 46a - 46e, compression springs 47a - 47e are respectively held by screws from the reverse side ofrecording frame 60 withshort shaft stoppers 56a - 56e sandwiched as shown in Fig. 9. - Compression springs 47a - 47e are pressed between the cap keel and
short shaft bearings 61 a - 61 e because the springs are held by screws. The movement ofcap 41 at this juncture will be described later. - Next,
first wiper 50 andsecond wiper 52 are made of plastic material such as rubber, etc. having a good abrasion resistance, and the straight portions of leadingends second wipers first wiper 50 andsecond wiper 52 are respectively fixed tofirst wiper stay 49 andsecond wiper stay 51 by means of screws, etc. (not shown). First and second wiper stays 49 and 51 are both made of corrosion-inhibiting rigid metal such as stainless steel, etc. - Further, as shown in Fig. 9,
first wiper stay 49 andsecond wiper stay 51 are held onrecovery frame 60 by screws, and theprojection 41 a ofcap 41, which will be described later, and the wiper leading ends 50a and 52a are arranged to accurately parallel themselves at this juncture. Also theaforesaid projection 41a, wiper leading ends 50a and 52a, and the mounting face ofrecovery frame 60 for wiper stays 49 and 51, and the imaginary two-dot chain line a in Fig. 9 connecting the center lines ofboss sections front cam gear 59a andrear cam gear 59b are arranged to be in parallel accurately as described later. Also, as shown in Fig. 9, the structure is formed to enable the height of theleading end 52a of second wiper againstrecovery frame 60 to be higher than that of theleading end 50a of first wiper againstrecovery frame 60. In order to provide this structure, it is possible to change either the heights of the aforesaid plastic portions made of rubber, etc. of first andsecond wipers reference numeral 54 designates a recovery frame bearing, andrecovery frame shaft 55 shown in Fig. 1C (control cross-sectional view) is allowed to fit theelongated hole 54a of recovery frame bearing 54 in the transverse direction. Here, in this respect,recovery shaft 55 is fixed tomain body frame 63, butrecovery frame shaft 55 may also be supported rotatably bymain body frame 63. Recovery frame shaft bearing 54 is made of polyacetal resin having a good slidableness and is fixedly screwed torecovery frame 60. Recovery frame bearing 54 is fixed againstrecovery frame 60 in the direction indicated by arrow in Fig. 9 at a position which enables the center of the depth ofelongated hole 54a to be in the central part ofrecovery frame 60. Also, here, the center of hole 61 ci of short shaft bearing 61 c is positioned in the central part ofrecovery frame 60 in the direction indicated by arrow β as shown in Fig. 9. Further, the center ofhole 61b1 of short shaft bearing 61 b and that ofhole 61d1 of short shaft bearing 61 are symmetrically positioned in the direction indicated by arrow with short shaft bearing hole 61 ci as the center. Also, the center ofelongated hole 61a1 of short shaft bearing 61 a in the direction indicated by arrow and the center ofhole 61e1 of short shaft bearing 61 are likewise positioned symmetrically in the direction indicated by arrow with thehole 61 c1 as the center. Now, it is desirable to equalize four distances between the centers of holes, i.e. the distance between the centers ofholes reference numeral 62 designates a recovery frame shaft which is arranged across both of the side plates ofmain body frame 63. Thisrecovery frame shaft 62 is rotatably supported around a bearing (not shown) provided inmain body frame 63. Further, to thisrecovery frame shaft 62,idler gears main body frame 63 and outside thefront cap guide 48a andrear cap guide 48b which will be described later. In view of assemblingrecovery frame 62 inmain body frame 63, parallel pins or spring pins (both not shown) and E ring stopper are used as means to fix idler gears 57a and 57b torecovery frame shaft 62. Further, torecovery frame shaft 62,outer idler gear 58 is fixed with D cut portion formed at an end ofrecovery frame shaft 62 as its rotation stopper, withmain body frame 63 being sandwiched as shown in Fig. 9. Then, toidler gear cam gear shafts main body frame 63 respectively at positions outside the cap guides 48a and 48b and inside themain body frame 63. Here, the modules and number of teeth ofgears gear 58 andgears gear 58 is connected to stepping motor CM. - As above describes, the number of teeth thus arranged enables the gears engaged with cam gears 59a and 59b to rotate one round exactly the same as the cam gears completing one round, so that the rotational angles and positions of these gears are detected by a microswitch slit type sensor (not shown), etc. to detect the position of the
boss section 59a, ofcam gear 59a and theboss section 59b1 ofcam gear 59b. Therefore, if only a gear, a timing pulley, or the like, which should complete one round in synchronism with the one rotation of cam gears 59a and 59b, is arranged in the driving system for detecting the position of such gear, timing pulley, or the like, it is not necessary to make the number of teeth identical to each of thegears recovery frame 60, cap guides 48a and 48b are fixedly mounted in addition to these gears. Cap guides 48a and 48b are made of polyacetal resin having a good slidableness. Then,grooves boss sections boss section 59a, andboss section 59b1 are arranged at positions just opposite to each other. - Since the structure is of such as described above,
recovery frame 60 performs rocking motion in the direction indicated by arrow X in Fig. 10 (central cross-sectional view) withrecovery frame shaft 55 as the center when outeridler gear 58 is rotated. Now, since the vicinity ofrecovery frame 60 is constructed with the parts described as above,recovery frame 60 is positioned by the plane formed by two-dot chain line a andrecovery frame shaft 55 as shown in Fig. 9. Here, two-dot chain line a andhead shaft 36 are arranged to be accurately in parallel. Althoughrecovery frame 60 is positioned by the plane formed by the aforesaid two-dot chain line a andrecovery frame shaft 55, it is not fixed by the aforesaid structural members.Recovery frame 60 is structured to be flexible in the direction indicated by arrow θ and by curbed arrow γ in Fig. 9. - Next, using Fig. 11, the arranging position of first
recovery cap guide 48a andsecond cap guide 48b is the direction indicated by arrow θ in Fig. 9 towardsrecovery frame 60 will be described in detail. On both first and second cap guides 48a and 48b, Uletter type holes recovery frame 60 to allow the center of the shorter width ofprojection 41 a (indicated by arrow in Fig. 11) ofcap 41 to be placed in the center of the aforesaid space of U letter holes 48a, and 48b1. - Next, on
first head arm 37a andsecond head arm 37b,circular projections front head arm 37a andrear head arm 37b. Then, the arranging positions of the aforesaidcircular projection nozzle section 38a to be placed in the central position of the circular projection. Also, the diameter of the aforesaidcircular projections - Now, since the structure is arranged as described above, when
recovery frame 60 is raised by the rotation of cam gears 59a and 59b at the time of capping,circular projections head arms nozzle section 38a andprojection 41 a ofcap 41 are just oppositely placed. - Here, in the present embodiment,
recovery frame 60 can be displaced in the direction indicated by arrows θ and γ (in Fig. 9) by the construction as described earier. Therefore, according to the present embodiment, even when there is a slight difference in the positions of the aforesaid U letter holes 48a, and 48b1 andprojection slant 48c andholes only projections slant 48c of U letter holes 48a1 and 48b1. - Further, the positioning of
cap 41 andfront head plate 38c, which will be described later, is performed naturally in this course of event. Also, even ifrecovery frame 60 approachesnozzle orifice face 38b with some inclination,projection 41 a andnozzle section 38a can approach each other with the face to face positional relationship. - Next, using Figs. 10 through 15, the shapes and movement of
cap 41,cap keel 42,valve 43,valve cover 44, and waste ink tube will be described. - Fig. 10 illustrates the state immediately after
head 38 andcap 41 are in contact with each other. Fig. 11 illustrates the state whenhead 38 andcap 41 are parted. Fig. 12 illustrates the state whencap 41 is movedforwards head 38. Fig. 13 illustrates the state whereprojection 41 a closesnozzle 38a by pressure, and spring 47 is resiliently deformed. Fig. 14 illustrates the state wherecap 41 is parted fromhead 38, and Fig. 15 illustrates the standby state. In each of the figures, A is a side view observed from the location of side plate; B is a cross-sectional view in the transverse direction; and C is a cross-sectional view in the longitudinal direction. In Fig. 11, however, A is also a side view but B is a cross-sectional view in the longitudinal direction. - At first, Figs. 10A through 10C illustrate the state representing the
moment cap 41 has come into contact withfront head plate 38c.Cap 41 has not been deformed as yet. In conjunction with Fig. 10B, the cross-sectional shape ofcap 41 is described in detail. The side portions ofcap 41 are formed with inclination so as to widen the distance between them as the cap is raised upwards as shown in Fig. 10B. The inclined side portions are connected to the curbed portions indicated by mark a in Fig. 10B, and the thickness of the portions a are made thinner than the other portions as illustrated in Fig. 10B. Although, in the present embodiment, the portions a are formed with a smooth curvature, these portions may also be formed in an abrupt edge. In the case of an abrupt edge in which these should be formed, the thickness of such edge portions could be made thinner. Likewise, in Fig. 10C, the cross-sectional shape ofcap 41 in the transverse direction is formed to open itself towards the outside as it is raised upwards as in Fig. 10C. - The cross-sectional shape of
cap 41 in the transverse direction is formed in such a manner that the thickness ofcap 41 contacting withfront head plate 38c is made thicker than that of the cross-sectional shape ofcap 41 in the longitudinal direction shown in Fig. 10B also contacting the aforesaidfront head plate 38c. This is due to the fact that although the positioning ofcap 41 againsthead 38 in the transverse direction is accurately performed, the positioning in the longitudinal direction is not performed accurately. Therefore, such construction as is the present embodiment may not be needed if only the positioning ofcap 41 againsthead 38 is accurately performed in the longitudinal direction. Now, reverting to Fig. 10C, the side portions ofcap 41 are connected to curbed portions b which change its shape smoothly as in Fig. 10B, and the thickness of portions b is made thicker. In the present embodiment, the shape ofcap 41 in Figs. 10B and 10C is such that the thickness thereof becomes increasingly thinner smoothly towards as illustrated in these two figures. Now, reverting to Fig. 10B, in the closed space incap 41,projection 41 a integrally formed withcap 41 is provided. The arranging position ofprojection 41 a is defined so as to allow the top of R shapedportion 41 c ofprojection 41 a to be located at a position againstnozzle section 38a. The length ofprojection 41 a in the longitudinal direction at both ends is made longer than the entire length in whichnozzle section 38a is arranged. Next, throughhole 41 b is provided oncap 41. The throughhole 41 b incap 41 is provided with throughhole 41 provided oncap keel 42. Then, the aforesaid throughhole 41 b,valve 43 is fitted. Theaforesaid valve 43 being formed with plastic material, it can produce a state which is closed from the atmosphere without any pressure exerted onvalve 43. Here, the reason whyvalve 43 can properly function as a valve is that whilecap keel 42 is formed with rigid material as described earlier, the contact face betweenvalve 43 andcap keel 42 is formed excellent precision. - Next, around
valve 43,valve cover 44 is mounted to enclosevalve 43, and capkeel 42 and valve cover 44 are closedly fixed. Further,valve cover 44 is closedly coupled withwast ink tube 45.Cap 41 begins to approachrecording head 38 from the state shown in Fig. 10 by the rotation of cam gears 59a and 59b in the direction indicated by arrow d in Fig. 10A. Along the movement of theaforesaid cam gear cap 41 begin to move in the directions indicated by arrow c in Fig. 10B and Fig. 10C while maintaining contact withfront head plate 38c. This movement occurs because the sides ofcap 41 are formed to open as the cap is raised upwards. Now,cap 41 is moved in the direction indicated by arrows c due to the shape ofcap 41. In addition to this, it is due to the increasing pressure in the closed space incap 41 resulting from the reduction of volume of the closed space incap 41. As the pressure in the closed space incap 41 increases,valve 43 begins to open, and air in the closed space begins to flow fromvalve 43 and waste ink (not shown) begins to flow towardswaste ink tube 45. Further, Fig. 12 illustrates the state where cam gears 59a and 59b have rotated in the direction indicated by arrow d. - In Fig. 12B, the side of
cap 41 is in contact with the rising portion of the edge offront head plate 38c and the movement in the direction indicated by arrow c in Fig. 10 is stopped. The side ofcap 41 in the transverse direction shown in Fig. 12C is formed thinner than the thickness of the side in the longitudinal direction as described earlier. Therefore, its movement in the direction indicated by arrow c is stopped by the rigidity of the side itself. In the present embodiment, the thickness of the side ofcap 41 shown in Fig. 12C is changed as described earlier, but if the thickness of the side ofcap 41 in the transverse direction is made thin as in the case of the thickness of the side in the longitudinal direction as described above, the same faction as the present embodiment can be materialized by allowing the side to be in contact with the rising portion of the edge offront plate 38c. - Now, in Fig. 12B, the portions a of the sides of
cap 41 are deformed as shown in Fig. 12B due to bending stress generated after the sides of the cap are in contact with the edges offront head plate 38c. The thick portions including the contacting faces of the sides ofcap 41 receive buckling load, and the aforesaid portions a, being deformed to bend, are not buckled. This results in the similar deformation taking place in the sides ofcap 41 including the portion b in Fig. 12C which is also being deformed. Here, in Fig. 12C,compression spring 47a has not been pressed as yet. - In Fig. 12B, the pressure in the aforesaid closed space generated by
cap 41 becomes higher than the pressure in the state represented in Fig. 10, andvalve 43 is released to flow air in the closed space incap 41 and the aforesaid waste ink to wasteink tube 45. - In this respect, when cam gears 59a and 59b are further rotated in the direction indicated by arrow d, cap 41 further approaches
head 38 and theprojection 41 a ofcap 41contacts nozzle 38a. Here, there is almost no deformation ofcap 41 with the exception ofprojection 41a. Also, when cam gears 59a and 59b are still further rotated in the direction indicated by arrow d,compression spring 47a begins to deform, and the reaction generated by theaforesaid compression spring 47a causesprojection 41 a ofcap 41 to pressnozzle section 38a. In this respect, onlycompression spring 47a is illustrated in Fig. 10 through Fig. 15, but the other compression springs 47b, 47c, 47d, and 47e function in the same way ascompression spring 47a. Here, the time needed for theaforesaid projection 41 a to pressnozzle 38a is approximately several seconds which are required for liquid ink to circulate inhead 38. At this juncture, a pump is actuated to circulate liquid ink. - In the above-mentioned embodiment the
cap 41 and theprojection 41 a are integrally formed of an elastic material such as rubber. However, thecap 41 may be a member separate from theprojection 41 a and the whole body of thecap 41 does not have elasticity. At least the headdischarge port surface 38c and the contact section may be elastic and in this case a remaining upper part thereof may be of steel. - Now, Fig. 13 illustrates the state where
compression spring 47a is deformed as the above describes, andboss sections cap 41, andvalve 43 only shows the state to close air. Therefore, the pressure in the closed space is equal to the atmospheric pressure. Hereinafter, the state of each part, when cam gears 59a and 59b are rotated from the state shown in Fig. 13 in the direction indicated by arrow e, will be described. Now, the rotational direction of cam gears 59a and 59b means the required movement ofboss sections cap 41 is again increased and the pressure in the closed space becomes negative against the atmosphere, andvalve 43 is closed as shown in Fig. 14. Therefore, in order to supplement the reduced volume in the closed space incap 41, ink is discharged fromnozzle section 38a ofrecording head 38. Ink remaining innozzle section 38a is refleshed. - Finally, Fig. 15 illustrates the pheripheral
parts including cap 41 being in the standby state where an apparatus according to the present invention has not started performing operation such as recording, recovering, etc. In Fig. 15, the cam gears are at rest. In Fig. 15B, the pressure in the closed space incap 41 is identical to the atmospheric pressure. At this juncture, there is no force exerted onvalve 43 either to open or close tovalve 43. However, due to the shape ofvalve 43, water vapor in the closed space incap 41 is not released into the atmosphere. - Fig. 15D is a view showing another embodiment of guide member according to the present invention. On
first cap guide 48a andsecond cap guide 48b, V letter holes 48a2 and 48b2 are respectively formed, and the spaces in V letter holes are formed with excellent precision. - Next, on
first head arm 37a andsecond head arm 37b, square projections 37a3 and 37b3 are respectively formed, and the widths of the aforesaid projections are formed to fit exactly the spaces of the aforesaid V letter holes respectively. - Then,
first head arm 37a2 andsecond head arm 37b2 are arranged to allow the leading ends of square projections thereof 37a3 and 37b3 to mate respectively with V letter holes 48a2 and 48b2 when the projection ofcap 41 is in contact withnozzle section 38a ofhead 38. - With a structure such as this, even if there is a slight difference in the positions of the aforesaid V letter holes 48a2 and 48b2 and the aforesaid square projections 37a3 and 37b3,
recovery frame 60 enables theholes 48a2 and projection 37a3 and thehole 48b2 andprojection 37b3 to be mated reliably because the frame can displace itself in the directions indicated by 0 and y in Fig. 9. - Fig. 15E is a view showing still another embodiment of guide member according to the present invention. On first head arm 37a4 and
second head arm 37b4, U letter holes 37a5 and 37b5 are respectively formed, and the spaces of U letter holes are formed with excellent precision. - Next, on
first cap guide 48a andsecond cap guide 48b, circular projections 48a3 and 48b3 are respectively formed, and the widths of the aforesaid circular projections are formed to fit exactly the spaces of the aforesaid U letter holes. - Then, first head arm 37a4 and
second head arm 37b4 are arranged to allow the leading ends of U letter holes 37a5 and 37b5 to fit circular projections 48a3 and 48b3 respectively when the projection ofcap 41 is in contact withnozzle section 38a ofhead 38. - With a structure such as this, even if there is a slight difference in the positions of the aforesaid circular projections 48a3 and 48b3 and the aforesaid U letter holes 37a5 and 37bs,
recovery frame 60 enables the projection 48a3 andhole 37a5 and theprojection 48b3 andhole 37b5 to be mated reliably because the frame can displace itself in the directions indicated by arrows 0 and y in Fig. 9. - Next, the ink supply and recovery systems will be described. This unit comprises an ink tank, ink tubes, an ink pump, etc. to keep ink and supply it regularly to a recording head and to remove bubbles generated in the tubes, etc., as well as anything that may clog nozzles.
- Fig. 16 is a view illustrating the concept of an embodiment according to the present invention. In Fig. 16, an ink cartridge cam
prises recording head 38,ink pump 76,ink tank 86,wast ink absorber 96, andair duct 87 which is called breezer. - The initial ink supply to
recording head 38 is carried out in a manner given below. In other words,ink pump 76 is actuated in a state wherecap 41 is closely contacted with the recording head (a state shown in Fig. 13 whereprojection 41 a incap 41 is in contact withnozzle section 38a of recording head 38) to circulate ink fromink cartridge 86 in the direction indicated by arrow E, so that the inside of the tubes including the inside of the recording head is filled with ink. At this time, some ink is flown out to cap 41, but it is returned toink cartridge 86 throughwaste ink tube 45 and collected to built-inink absorber 96. - When the initial ink supply is completed,
recording head 38 is ready to discharge ink. The ink pump used in the present embodiment, however, is a pump which does not close the flow passage when the pump is at rest. Therefore, the ink supply at the time of discharging is carried out from both front and rearhead ink couplers - When ink is reduced due to discharging, air should be drawn into the tank in an amount equal to the reduced amount of ink.
Breezer 87 functions as an air duct for this purpose. In thisbreezer 87, check valves capable of being opened by an extremely small difference in pressures are respectively arranged in both directions. Therefore, the valves function if a slight pressure, either negative or positive, is generated in the tank, and operate as air holes substantially. However, the valves are also arranged to control dust intrusion and evaporation. - A
reference numeral 92 designates a no-ink detector for detecting no-ink condition intank 94. The detection is carried out in a manner given below. In other words, sincefloat chamber 90 is open to the atmosphere throughbreezer 87 which is commonly provided forink tank 94, the liquid level therein and float 89 which floats thereon indicate the same water level 91 a asliquid ink level 91 inink tank 94. Therefore, at an appropriate location in the lower part offloat chamber 90,sensor 88 is arranged for detecting a light interruption. Thus, whenliquid level 91 is lowered, i.e., float 89 is lowered following the lowering of water level 91 a in the area for detection, the emitting light from thesensor 88 is interrupted, thereby detecting the no-ink condition. - Next, the recovery operation is described. The recovery operation is an action to remove bubbles and cloggings which bender the normal discharging, and is performed in accordance with the recovery sequence, which will be described later, controlled by the recovery system. The recovery operation, however, is exactly the same as the initial ink supply operation. In other words,
ink pump 76 is actuated whilecap 41 is in contact with recording head 38 (the current state is illustrated in Fig. 13) to circulate ink in the direction indicated by arrow A, so that bubbles are collected into the ink tank to release them to the outside through the breezer. Also, the contacting condition between projection incap 41 andnozzle 38a is released to drive the pump for the removal of any clogging in the nozzle. At this time, pressurized ink is flown intofloat chamber 90. Then, float 89 is raised to closely contact with upper face offloat chamber 90 to cover the passage tobreezer 87. Therefor, no ink is flown intobreezer 87. - Fig. 17 is a perspective view showing the construction of supply and recovery systems, in which the structure of the present embodiment is actually employed. In Fig. 17, a
reference numeral 73 designates the base of this unit which also functions as a base for installingink cartridge 86, which will be described later. Also, areference numeral 74 designates a member called joint plate which is formed by fixing each of various passage couplers. To thisjoint plate 74, there are coupledcartridge guide 78 forpositioning ink cartridge 86,cartridge joints ink absorber 96 built inink cartridge 86 through waste ink tank, air joint 80 for connecting the breezer for releasing air withair tube 83, first and second supply tube joints 84 and 85 for connecting first and secondink supply tubes ink pump 76 which is driven bypump motor 77. Thus, ink joint 79 connected toink tank 94 accommodated inink cartridge 79a provides three functional sections intensively, firstink supply section 79a, secondink supply section 79b, and airpassage connecting section 79c, and with its structure, enables firstink supply inlet 95a, second ink supply inlet 75b andair inlet 95c to be coupled altogether, which are operationally related to the function ofink tank 94. - For this purpose, the air passage section leading to the ink tank is formed by joints, thereby making it possible to construct the ink tank with hard resin material, to reserve a large quantity of ink without employing ink bags.
- Furthermore, by connecting first
ink supply inlet 95a and secondink supply inlet 95b, and firstink supply section 79c and secondink supply section 79b, an ink circulation passage is formed to perform ink supply from both of the ink supply regions at the time of recording and to circulate ink from the ink tank through the passage with the pump inbetween, and to circulate ink from the recording head to the ink tank again at the time of initial ink filling and recovery operation. - In other words, since the passage is formed by directly joining the tank and the supply passage, and further the air passage as described earlier, it becomes possible to eliminate, in spite of the ink tank being made of hard plastic resin, such function as a sub-tank which has conventionally been indespensable for a stable ink supply. In the present embodiment, these members are separately fixed to
joint board 74, but the structure may also be such that these members are integrally formed with the joint board. - Further, to
joint board 74,flow passage board 75 is coupled withflow passage gloove 75a which functions as ink flow passage. In this portion, most of the ink flow passage pipings and connections are installed. - In other words, by fixedly arranging
joint section 79 which is annexed tojoint board 74 connected toink tank 94, it becomes possible to provide a structure thereby eliminating the operation related toink passage 75a in that particular portion. - As a result, a part of ink passage from
ink tank 94 to the recording head can be formed only by coupling to the reverse side ofjoint board 79 theflow passage plate 75 which constitutes a flow passage. - On the other hand, as described later,
ink tank 94 built inink cartridge 86 is flexibly accommodated inhousings cartridge 86. - By accommodating the ink tank flexibly, it is possible to reliably adjust with ease the coupling condition of the cartridge which should be installed against
joint section 79 which is flexibly arranged, and in this way, the installation of cartridge is carried out with assurance. - It is also possible to construct the ink passage from the ink tank without complicated piping arrangements simply by coupling
joint board 74 and flowpassage plate 75 to form the required flow passage. - As shown in Fig. 18, there are accommodated in
ink cartridge 86, thecommon housings ink tank 94 made of resin having a good property against fluid andwaste ink absorber 96 made of a water absorptive material having an excellent ink absorptive property such as felt or porous material. The ink supply and air releasing are performed by connecting these members withcartridge 79 on the side ofjoint plate 74 throughjoint section 95. Thus, theentire ink cartridge 86 is structured to be detachably installed as a whole onbase 73 provided on the side of the apparatus. - Figs. 19A and 19B illustrate the structure of this part further in detail. Fig. 19A is a partially cutaway cross-sectional side view showing the principal parts of ink cartridge
main body 86. Fig. 19B is a partially cutaway cross-sectional view showingjoint section 95 connected to the cartridge joint of the ink supply system. In order to prevent any ink leakage whenink cartridge 86 is removed,metal ball 99 is provided injoint section 95 to press it againstjoint opening 95a by the compression ofspring 98. When the ink cartridge is detached from the unit,metal ball 99 is closely in contact withshealing rubber 101 to close theopening 95a of the joint section. - Also, as shown in Figs. 19A and 19B and Fig. 20 showing the front cross-section of ink tank, ink tank has sloped surfaces or
slants joint section 95 from behind, andslant 94b for gathering ink flow intojoint section 95 from the side ofink tank 94. Ink is supplied to the ink supply system through guidingtube 100 which is bent to be opened at the lowest bottom of the ink tank. Abottom support 93b supports the rear portion of the slopedsurface 94a of theink tank 94. Thus, it is possible to collect all ink in the vicinity of guidingtube 100 by formingslants waste ink absorber 96 substantially in U shape. - Furthermore, in the present embodiment, it is necessary to couple three flow passages, i.e., two ink supply passage and one air releasing passage, in
joint section 95, but in order to obtain reliable couplings,ink tank 94 is held inhousings space 97 to allow the ink tank to move freely in an appropriate amount. - Especially, it is necessary to provide flexibility not only vertically and horizontally but rotatably when a plurality of joints should be connected. In the present embodiment, a slight rotatability is maintained to obtain a rotatable flexibility against the central axis of
joint section 95 by supportingink tank 94 with spaces 97 (in this embodiment, for example about 1.0 mm) andspaces 97a (for example, about 1.0 - 2.0 mm) provided for both ends ofink tank 94 and bywaste ink absorber 96 which is soft like felt. Aprojection 93d supports a front bottom of theink tank 94. Hence it is possible to make connections reliably without any deviations in positioning. In this embodiment thejoints ink tank 94 is connected to the body joints in a state which it floats about 0.5 mm to the body joints. Furthermore, in order to prevent any abnormal sound generated by the movement ofink tank 94 by vibrating impact, etc. or breakage of housing as well as to effectively utilize space, the central part ofwaste ink absorber 96 is removed as shown in Fig. 18 to allow the lowestbottom ink tank 94 to be fitted into the removed part, so that the ink tank is held by the remaining portion of circumference. With this structure, impact can be absorbed by the softness ofwaste ink absorber 96 and the required flexibility is maintained. In this way, the ink tank is protected from the external impact and the clattering of ink tank is also prevented because in this structure the waste ink absorber is fitted at the lowest bottom of the ink tank and at the same time, the ink tank is held by soft material such as felt of the circumferential portion of the waste ink absorber. - Next the recovery sequence will be described. The recovery operation is needed to maintain a normal recording. With this operation which is performed by the linkage of recovery system and ink supply system, bubbles and cloggings in the flow passage are removed. Fig. 22 is a flowchart showing this operation. Figs. 23A through 23D are schematic views showing the system in operation. In Figs. 23A through 23D, for the purpose of simplifying description, a unit comprising
recording head 38, head arms, etc. is defined ashead unit 65, anotherunit comprising cap 41,wipers recovery frame 60, etc. is defined ascap unit 65.Head unit 65 is rotatable withhead shaft 36 as its rotating center whilecap unit 64 is rotatable withrecovery frame shaft 55 as its rotating center. Hereinafter, the sequence of recovery operation will be described. - In the normal standby state, the relationship between
recording head 38 andcap 41 is, as has been already described, that the closed state is maintained as shown in Fig. 15 by slightly bending the periphery of the cap. The recovery operation begins as shown in Fig. 12 with pressingprojection 41 a incap 41 againstnozzle 38a arranged on the top of recording head by rotating cam gears 59a and 59b (the cap unit position at this juncture is referred to as press position) (S22-1). Next, in this state,ink pump 76 is actuated to circulate ink in the supply passage (S22-2) and remove bubbles in the tube.Projection 41 a is pressed againstnozzle 38a in order to prevent ink from being flown out from the nozzle because otherwise a part of ink is not circulated by the pressure generated by the ink pump and flown out of the nozzle as useless waste ink. - Next, as indicated by arrow F in Fig. 23A,
cap unit 64 descends (this state is referred to as retracted position) (S22-3), andfurther head unit 65 is rotated as indicated by arrow G in Fig. 23B whilecap unit 64 is rotated as indicated by arrow H in Fig. 23B to be in the wiping starting position (S22-4). Subsequently,head unit 65 is rotated as indicated by arrow I in Fig. 23C to clean off ink droplets, dusts, etc. on dischargingport face 38b of the recording head withwipers port face 38b of the recording head is passing a first wiper, there are two wipers provided in the present embodiment. Therefore, when the cleaning off by a second wiper is terminated,cap unit 64 again descends to the retracted position as indicated by arrow J in Fig. 23D, andhead unit 65 returns to the home position (S22-7). Then, finally,cap unit 64 ascends to the normal standby state as shown in Fig. 1 (S22-8) to complete the recovery operation. - The cleaning in the present embodiment will additionally be described. The recording head employed for the present embodiment has discharging ports formed across the entire recording width of recording medium, i.e., the so-called full line type as described earlier. However, in the case where a discharging port face is extremely elongated as in the present embodiment, a sufficient cleaning cannot be performed with the use of one blade just for a one-time wiping. This is due to the difficulty in applying pressure by a blade equally all over the discharging port face, which is now too long for such a cleaning.
- In the present embodiment, therefore, two blades,
blade - Particularly, at the time of cleaning, it is important for the two blades to contact with the discharging port face of recording head each individually to perform cleanings, so that the effect of double- wiping should be obtained. With a sequential arrangement of two blades such as this, the cleaning time can be shortened as compared with the case where a cleaning action is taken twice with one blade. Also, in the present embodiment, the size of
blade 50 which contacts the recording head first differs from the size ofblade 52 which contacts it subsequently. The recording head rotates withhead shaft 36 as its rotating center, and in order to place the leading end of the blade to be in contact with the discharging port face within the path of the recording head to move, it is necessary to define the length of each blade accordingly. Therefore, it is also possible to perform the required cleaning by driving the cap unit following the rotational movement of the recording head while making the length of eachblades - Also, by making the length of each of plural blades contacting the rotating
head 38 different, it is possible to vary the length I of the leading end of the blade contacting the dischargingport face 38c of the head and/or the contactingdegree 80 of each blade (Fig. 23E). Hence, it is possible to vary the force and area of each blade with which to contact dischargingport face 38c to control possible splashing of adhered ink and dust on dischargingport face 38c to the surrounding area at the time of cleaning off. Also, by making the contacting amount and/or contactingangle 80 of each blade against dischargingport face 38c greater sequentially following the order in which each of the blades are in contact with dischargingport face 38c of the head, it becomes possible to allow the first blades to contact dischargingport face 38c lightly when there are more ink or dusts adhered thereto, which should be cleaned off and the later blades to contact it sufficiently to clean off the remaining ink and dusts. Consequently, while controlling the possible splashing of ink and dusts adhered to dischargingport face 38c to the surrounding area, it is possible to remove them completely. - Furthermore, when the first blade wipes discharging
port face 38c, the rest of blades function as protective wall (Fig. 23C) to prevent the ink and dusts removed by the first blade from being splashed to surrounding area of the recovery system and eliminate the causes to stain the recording sheet or to electrically short circuit electronic circuit board. - In this respect, it is not necessarily limit the number of the blades for cleaning to two as described above, but more blades can also be employed. Also, although in the present embodiment, the same material is used for both
blades - Next, referring to Fig. 24, the sequence at the starting time of recording will be described.
- The recording is started in a manner given below. At first, a signal to start recording is received by the recording head at a step S24-1, the recording head at this juncture being in the standby state where only the cap covers the discharging port face of the recording head as shown in Fig. 15. Then, at a step S24-2, the cap unit is retracted to the state in which the recording head and the cap are set apart as shown in Fig. 11, i.e., the retracted position.
- Subsequently, at a step S24-3, while maintaining the state shown in Fig. 11, a preparatory discharging of several ejections to several hundred ejections is effectuated from the entire nozzles of the recording head.
- Hence, the discharging condition of the entire nozzles of the recording head is equalized.
- Then, after the preparatory discharging is terminated, the cap unit and head unit are moved at a step S24-4 to constitute a starting condition of wiping action as shown in Fig. 23A. Then at a step S24-5, a series of wiping action is performed as shown in Fig. 23B through 23D, and at a step S24-6, the recording unit is moved further to the recording position as shown in Fig. 1 where such state is held. After that, recording signals are sequentially inputted to carry out recording as desired.
- Next, the recovery operation which is executed by circulating ink will be described further in detail. In the present embodiment, as shown in Fig. 16, bubble sensor 103 (for example, a transmitting sensor, etc.) is provided to enable detecting bubbles in ink supply tubes. Accordingly, it is possible to perform two different types of recovery operations, i.e., an automatic recovery to be carried out periodically each at a predetermined time, and an occasional recovery to be performed when
bubble sensor 103 detects any incidental bubble or bubbles. The occasional recovery becomes possible with the installation ofbubble sensor 103, and with this, the incidental non-discharging hitherto experienced can be reduced, thereby making it possible to improve the reliability of the apparatus. Particularly, in consideration of the safety with which all bubbles are removed irrespective of the presence of bubbles, the amount and location thereof, a considerably excessive circulation time and number has been given to perform a sufficient removal of bubbles. In the present embodiment, however,bubble sensors bubble sensor 103b arranged at the down stream of ink flow at the time of circulation should detect a signal indicating that bubbles have been removed (no bubble presence), the ink pump is stopped after a while (a period required for the detected bubble exhausted to the tank from the current position of the sensor). Consequently, there is no need for providing any excessive circulation time as has been required conventionally, resulting in the termination of the recovery sequence in a shorter period of time. Also, there is an advantage that the reliability of bubble removal improves because the recovery action is terminated after no bubble presence has been detected. In this way, the amount of ink consumed for recovery becomes small, which leads to the prevention of no ink condition at the time of receiving facsimile or of no reception state during the recovery operation. - Fig. 25 is a block diagram showing the recording unit according to an embodiment of the present invention.
- In Fig. 25, microcomputer (CPU) 101 controls the operation of the unit in accordance with the program stored in
ROM 112 and data stored inRAM 113. - Ink
jet print head 102 performs recording by control (strobe) signals from CPU after data each for a one-line portion has been received from CPU. -
Drivers -
Reference numerals - Head
position detecting sensor 109 and capposition detecting sensor 110 detect the positions by means of on-off of microswitches, for example. - A reference numeral 111 designates a bubble sensor.
- A motor (P motor) 115 for driving the ink pump is a DC motor which rotates with on. A driver (transistor circuit) 114 supplies current to turn on the P motor by a signal from CPU.
- Next, in accordance with a flowchart shown in Fig. 26, the operation at the time of recording will be described.
- At first, when the recording operation is started, W motor is driven for a required number of steps to convey recording sheet to a predetermined position (S26-2).
- Next, to head 38, a black data for a one-line portion is transmitted (S26-3).
- Then, cap is retracted to the retracted position (S26-4). In this respect, C motor is driven for a predetermined number of steps, or is continuously driven until the
moment sensor 110 detects thatcap 41 has moved to the retracted position. Either methods are applicable (hereinafter the movement of head and cap are the same). - Next, the so-called empty discharging is performed by transmitting a predetermined number of strobe signals (S26-5) to
head 38. - Then, while wiping action is being taken,
head 38 is transported to the recording position. In other words,head 38 and wiper (cap unit 64) are transported to the starting position for wiping (S26-6 and S26-7), and by advancinghead 38 to the recording position as it is, wiping is terminated (S26-8). - Also, after that,
cap 41 is returned to the retracted position (S26-9). - The recording operation is executed by repeating the transmission of data each for a one-line portion to head 38, the transmission of strobe signals, the recording of the one-line portion (S26-10 and S26-11), and the driving of W motor to convey recording sheet for a one-line portion (S26-12) until the recording of a one-page portion is terminated.
- Then, after the recording of the last line has been terminated (S26-13),
head 38 is returned to the standby state (S26-14) andcap 41 is returned to the capping position (S26-15 and S26-16). - After that, W motor is driven to exhaust recording sheet (S26-17) to terminate the recording operation.
- Next, in accordance with Fig. 27, the recovery operation will be described.
- While the apparatus is in the standby state, CPU examines timer ti in the CPU as well as the bubble sensor. If timer ti indicates a predetermined time T1 (24 hours, for example), the recovery operation is started (S27-2).
- Also, even when the timing is not t1 = T1, the recovery operation is started if bubble sensor 111 is on (the presence of bubble indicated) (S27-3).
- The recovery operation is performed as follows:
- At first, C motor is driven to transport
cap 41 to the pressing position (S27-5). - Next, P motor on signal is output to rotate P motor (S27-6).
- Then, the output of bubble sensor 111 is detected, and when the sensor output is turned off, counter t2 in the CPU starts counting (S27-7 and S28-8). When counter t2 indicates a predetermined value T2 (S27-9), time t2 is cleared (S27-10), and turn off P motor (S27-11).
- Then, the wiping action is actuated.
- At first, cap is transported to the retracted position (S27-12). Subsequently, after transporting
head 38 to the starting position for wiping,cap 41 is transported to the wiping position (S27-13 and S27-14), and then wiping is performed (S27-15) by transportinghead 38 to the position for terminating wiping (printing position).Cap 41 is again returned to the retracted position (S27-16) and to the capping position afterhead 38 has been returned to the standby position (S27-17). Then, the apparatus is again in the standby state. - This terminates the recovery operation.
- The present invention provides means for generating heat energy (for example, an electrothermal converter, a laser light, etc.) for the utilization of energy for ink discharging especially for ink jet recording method, and in a recording head and recording apparatus using a method to activate changes in a state of ink by utilizing the aforesaid heat energy, the present invention is particularly effective.
- For the typical structure and principle of an invention of the kind, it is preferable to employ the fundamental principle disclosed in the specifications of, for example, U.S. Patents 4723129 and 4740796. This method disclosed in applicable to the so-called on-demand type as well as to the continuous type. Particularly in the case of the on-demand type, by applying at least one driving signal, corresponding to recording information and providing a rapid temperature rise which exceeds nuclear boiling, to an electrothermal converter arranged for sheet or liquid passage holding liquid (ink), heat energy is generated in the electrothermal converter, and film boiling is accordingly generated on the thermal active face of recording head. As a result, bubbles are formed in the liquid (ink) one to one by this driving signal effectively. By the growth and contraction of this bubble, the liquid (ink) is discharged through the discharging port to form at least one droplet. If this driving signal is made to be a pulse type, the growth and contraction of bubble can be effectuated instantaneously and appropriately, and it should be more preferable to employ such system because with it, a discharging of liquid (ink) having an excellent responsibility can be attained. For a driving signal of the pulse type, those disclosed in the specifications of, for example, U.S. Patents 4463359 and 4345262 should be suitable. In this respect, if conditions disclosed in the specification of U.S. Patent 4313124 concerning an invention of the ratio of temperature rise on the aforesaid thermal active face are employed, a further excellent recording can be performed.
- For the structure of recording head, those structures, in which a thermal active unit is arranged in a bending region, disclosed in the specifications of U.S. Patents 4558333 and 4459600 are included in the present invention in addition to a combination structure (linear liquid flow passage or right angled liquid flow passage) of discharging ports, liquid passage, and electrothermal converter such as disclosed in each of the above mentioned specifications. Besides, the present invention is still effective for the structures based on the structure disclosed in Japanese Laid-Open Patent Application No. 59-123670 in which common slits against a plurality of electrothermal converters function as discharging ports of the electrothermal converter, and the structure disclosed in Japanese Laid-Open Patent Application No. 59-138461 in which an opening for absorbing the pressure wave of heat energy is used for the discharging port.
- Particularly, the present invention is effectively applicable to the recording head of a full line type with a length to cover the width of a maximum recording medium which can be recorded by the recording head. For a recording head such as this, a structure in which a plurality of recording heads as disclosed in the above-mentioned specifications are combined to meet the requirements of such length or a structure in which one recording head, integrally formed, is adopted may be applicable, but the present invention displays the above-mentioned effects more efficiently.
- In addition, the present invention is effectively applicable to the installation in the main body of an apparatus either in the case of a recording head of chip type which is freely replaceable to enable the electrical connection with the main body of the apparatus or the ink supply from the main body of the apparatus or in the case of a cartridge type recording head which is integrally mounted in the recording head itself.
- It is also desirable to add the recovery means for the recording head, preparative auxiliary means, etc. which constitute a recording apparatus according to the present invention because such addition makes the effects of the present invention more stable. These means are specifically capping means for recording head, wiping means, pressuring or absorbing means, electrothermal converter, or another heating element or preparative heating means by the combination of these elements, and aside from discharging for regular recording, it is also effective to effectuate a preparatory discharging mode for performing a stable recording.
- Furthermore, the present invention is extremely effective for a recording apparatus having at least one mode for recoloring with different colors or for full color with mixture of colors by the use of recording heads which are integrally structured into one head or by the combination of plural heads, not to mention the recording mode of principal color such as black, etc. as recording mode for a recording apparatus.
- In the embodiment set forth above according to the present invention, the description has been made of the case where liquid ink is used, but the present invention is also applicable to solid ink at room temperature as well as to ink becoming soft at room temperature. In the above-mentioned ink jet apparatus, it is usual to perform temperature control to make viscosity of ink to be in the range of stable discharging by adjusting the temperature of ink itself more to be than 30 ° C but less than 70 °C. Therefore, if only ink becomes fluid at the time of applying recording signals in use, those kinds of ink are also usable. Furthermore, the present invention is applicable to the use of ink having the property that the ink becomes fluid only by heat energy such as the one which can be discharged as liquid ink when it becomes fluid by the application of heat energy in response to recording signals or ink already becoming solidified at the time of reaching recording medium by utilizing positively the temperature rise caused by heat energy as energy to change the state of ink from solid to fluid for prevention or by using ink which is solidified when it is left for the purpose of preventing evaporation. In such case, ink can be held as liquid or solid state in a concave of porous sheet or through holes as described in Japanese Laid-Open Patent Application No. 54-56847 or Japanese Laid-Open Patent Application No. 60-71260, and is placed against the electrothermal converter in such mode. In the present invention, the performance of the above-mentioned film boiling method is most effective when each of the above-mentioned kinds of ink is employed.
- Furthermore, the mode of an ink jet recording apparatus according to the present invention is such that in addition to facsimile apparatus having receiving and transmitting functions as in the present embodiment, it can be used as image output terminal for information processing apparatus such as computer, etc, copying apparatus combined with reader, etc. or the like.
- In the present embodiment, a recording head is used for the recovery operation by circulation with ink supply tubes arranged at both ends respectively, but the present invention is also applicable to a recording head of such type that it has only one ink supply tube and performs recovery operation by suction from the front face of nozzle as a matter of course. It is also possible to reduce manufacturing cost by forming bubble sensor integrally with the constituents of the head.
- As set forth above, according to the present invention, it is possible to perform an accurate mating of ink jet recording head and capping means without the precision of each individual part and precise adjustment at the time of assembly.
- Furthermore, according to the present invention, it is possible to remove ink adhered to orifice face by a plurality of cleaning members, so that ink can be removed completely. It is further possible according to the present invention to remove effectively ink strongly adhered to the orifice face by the plural cleaning members each having different contacting area, contacting angle, and contacting position provided by different sizes of the cleaning members.
- In the above-mentioned embodiment, the ink container relating to three flow paths was explained as a sample, but it is possible to remove any extra backlash, by limiting the degree of freedom in a certain direction depending on the construction or number of the flow paths.
- In the above-mentioned embodiment, specially, the engagement of the container with the device is made only with the cylindrical portion at the periphery of the joint portions, but if such cylindrical portion for the engagement is changed in number or shape (for example to a polygonal or elliptic cylinder shape), then it is possible to reduce an extra degree of freedom after the mounting, and improve the stability of the seal for the connecting portion. The above-mentioned embodiment is so constructed that three connections relating to the communicating port to the air, the supplying side to the recording head at the time of the ink circulation and the returning side, respectively are made, but in order to achieve more effectively the removal of the babbles due to the ink circulation by decreasing the flow path resistance, correspondingly to the structure of the recording head, more supplying tubes may be used. At that time, it is possible to divide the supplying side and the returning side to plural ones, respectively, by applying thereto the above-mentioned embodiment.
- Further, in the above-mentioned embodiment, the structure in which the waste ink absorbing body is positioned on the bottom of the ink tank was explained. However, it is also possible to attain a more certain shock absorbing effect by adding it to the sides and top of the ink tank as well as the bottom. Also, it is possible to use a waste ink absorbing body with appropriate elasticity to prevent waste ink which has been absorbed from being squeezed out by the weight of the ink tank.
- Further, in the above-mentioned embodiment, the soft member positioned at the bottom of the ink tank are used to have the waste ink and mechanical shock absorbing functions, but it is possible to achieve the similar effect to the above even when an additional member with a superior shock absorbing capability, etc. is provided separately to said soft member, or the frame itself is formed with a soft material.
- Furthermore, in the above-mentioned embodiment, the recording head having at its both ends the supplying tubes and carrying out the recovery operation by the circulation is used, but this invention may be applied to a recording head having one supplying tube and of which recovery operation is carried out by suction from the front face of the nozzle. Also, it is possible to decrease the cost by forming both of the babble sensor and the recording head in a body.
- As explained above, in accordance with the embodiments according to the present invention, the ink jet recording apparatus is provided in which easy registration in position of the joint portion of the ink supplying side to the joint portion of the cartridge side is accomplished so that the ink cartridge is surely mounted.
- Also, since the joint portion of the ink supplying side is stationary, the complicated distribution of the ink supplying path from this joint portion to the recording head can be avoided and the sealing security after the connection can be improved. Therefore, the ink jet recording apparatus is provided which has the reliable joint portions from which any ink leakage due to vibration or shock does not occurred. Further, in accordance with the embodiments according to the present invention, three connections for the paths for supplying ink at the time of the circulation, the returning path and the communicating port to the air are used detachably between the ink tank side and the joint sides, and thus, it is possible to provide the ink supplying device which is voluminous, and strong in vibration and shock and which has no use for the sub-tank. Accordingly, it is possible to provide the ink jet recording apparatus having the ink supplying device which is low-priced, compact and moreover highly reliable. Also, in the above-mentioned embodiments, by not only holding the ink tank at its periphery with a soft member and but also using such soft member as the waste ink absorbing body, it is possible to, achieve an ink cartridge which is strong in vibration and shock, which can use effectively the space and which is compact and low-priced. In this connection, it is also possible to provide the ink jet recording apparatus which is miniaturized and has its decreased running cost and improved reliability. Further, in accordance with the above-mentioned embodiments, it is possible to provide an ink jet recording apparatus in which by controlling the operation of the ink pump using the means for sensing a babble in the ink supplying paths, the recovery operation can be reduced in frequency and time to minimum necessary values, the volume of waste ink can be decreased and the number of the recording papers which are recorded with a predetermined amount of ink can be increased, and, thus, its running cost can be reduced. Also, in a case where the above-mentioned embodiments are applied to a facsimile machine, since the time necessary to carry out the recovery process is shortened, a long recording enabling time can be achieved, and a probability of disabling facsimile signal reception because the facsimile machine is subject to the recovery process can be made to be small. An ink cartridge adapted to be loaded detachably to an ink jet recording apparatus for preforming a recording on a recording medium by discharging ink comprises an ink tank for accommodating ink therein, leading-out means for leading out ink within said ink tank to the outside, said leading-out means being provided on said ink tank, and a frame for supporting displaceably said ink tank on which said leading-out means is provided. Also, an ink jet recording apparatus for preforming a recording on a recording medium comprises a recording head for discharging ink from a discharge port to carry out the recording on the recording medium, a lording part for loading therein an ink cartridge, said loading part having an ink tank for accommodating ink, therein, leading-out means for leading out ink within said ink tank to the outside, said leading-out means being provided on said ink tank and a frame for supporting displaceably said ink tank on which said leading-out means is provided, and ink supplying means for supplying ink to said recording head by coupling to the lead-out means of said ink cartridge which is loaded in said loading part.
Claims (5)
Applications Claiming Priority (11)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP31715/90 | 1990-02-13 | ||
JP3173190A JPH03234658A (en) | 1990-02-13 | 1990-02-13 | Ink jet recording device |
JP3170490A JPH03234653A (en) | 1990-02-13 | 1990-02-13 | Ink jet recorder |
JP31735/90 | 1990-02-13 | ||
JP2031715A JPH03234655A (en) | 1990-02-13 | 1990-02-13 | Ink feeding device and ink jet recording device loaded with same ink feeding device |
JP31731/90 | 1990-02-13 | ||
JP31704/90 | 1990-02-13 | ||
JP3173590A JPH03234665A (en) | 1990-02-13 | 1990-02-13 | Ink cartridge and ink jet recording device loaded by same cartridge |
EP19910102045 EP0442485B1 (en) | 1990-02-13 | 1991-02-13 | Ink supplying device and ink jet recording apparatus using the same |
JP19939/91 | 1991-02-13 | ||
JP1993991A JPH04211972A (en) | 1990-02-13 | 1991-02-13 | Recorder |
Related Parent Applications (2)
Application Number | Title | Priority Date | Filing Date |
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EP19910102045 Division EP0442485B1 (en) | 1990-02-13 | 1991-02-13 | Ink supplying device and ink jet recording apparatus using the same |
EP91102045.1 Division | 1991-02-13 |
Publications (2)
Publication Number | Publication Date |
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EP0684139A1 true EP0684139A1 (en) | 1995-11-29 |
EP0684139B1 EP0684139B1 (en) | 1998-10-28 |
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Application Number | Title | Priority Date | Filing Date |
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EP19910102045 Expired - Lifetime EP0442485B1 (en) | 1990-02-13 | 1991-02-13 | Ink supplying device and ink jet recording apparatus using the same |
EP95110640A Expired - Lifetime EP0684139B1 (en) | 1990-02-13 | 1991-02-13 | Ink supplying device and ink jet recording apparatus using the same |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
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EP19910102045 Expired - Lifetime EP0442485B1 (en) | 1990-02-13 | 1991-02-13 | Ink supplying device and ink jet recording apparatus using the same |
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DE (2) | DE69122523T2 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0778141A1 (en) * | 1995-12-04 | 1997-06-11 | Hewlett-Packard Company | Out-of-ink sensing system for an ink-jet printer |
EP0860283A1 (en) * | 1997-02-19 | 1998-08-26 | Canon Kabushiki Kaisha | Ink jet recording apparatus, and method for recovering an ink jet recording head |
US5844580A (en) * | 1995-12-04 | 1998-12-01 | Hewlett Packard Co | Ink container configured for use with a printing device having an out-of-ink sensing system |
EP0913262A1 (en) * | 1997-10-31 | 1999-05-06 | Hewlett-Packard Company | Narrow and wide wiper blade cleaning system for ink jet printheads |
EP0997286A1 (en) * | 1996-12-24 | 2000-05-03 | Seiko Epson Corporation | Ink-jet recording apparatus |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3110872B2 (en) * | 1992-06-24 | 2000-11-20 | キヤノン株式会社 | Ink jet recording device |
US5369429A (en) * | 1993-10-20 | 1994-11-29 | Lasermaster Corporation | Continuous ink refill system for disposable ink jet cartridges having a predetermined ink capacity |
DE19849567B4 (en) * | 1998-10-27 | 2004-02-12 | Tally Computerdrucker Gmbh | Ink printer with an exchangeable cartridge for ink liquid |
Citations (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS54139533A (en) * | 1978-04-20 | 1979-10-30 | Ricoh Co Ltd | Air bubble remover of ink jet recorder |
JPS54139530A (en) * | 1978-04-20 | 1979-10-30 | Ricoh Co Ltd | Abnormal state detector of ink jet recorder |
JPS5613456A (en) | 1979-07-16 | 1981-02-09 | Mitsubishi Alum Co Ltd | Aluminum alloy for brazing filler metal of brazing sheet |
JPS5641148A (en) | 1979-09-12 | 1981-04-17 | Canon Kk | Vessel for recording liquid |
US4313124A (en) | 1979-05-18 | 1982-01-26 | Canon Kabushiki Kaisha | Liquid jet recording process and liquid jet recording head |
US4345262A (en) | 1979-02-19 | 1982-08-17 | Canon Kabushiki Kaisha | Ink jet recording method |
US4459600A (en) | 1978-10-31 | 1984-07-10 | Canon Kabushiki Kaisha | Liquid jet recording device |
JPS59123670A (en) | 1982-12-28 | 1984-07-17 | Canon Inc | Ink jet head |
US4463359A (en) | 1979-04-02 | 1984-07-31 | Canon Kabushiki Kaisha | Droplet generating method and apparatus thereof |
JPS59138461A (en) | 1983-01-28 | 1984-08-08 | Canon Inc | Liquid jet recording apparatus |
JPS60137658A (en) | 1983-12-26 | 1985-07-22 | Canon Inc | Ink supplier |
US4558333A (en) | 1981-07-09 | 1985-12-10 | Canon Kabushiki Kaisha | Liquid jet recording head |
US4723129A (en) | 1977-10-03 | 1988-02-02 | Canon Kabushiki Kaisha | Bubble jet recording method and apparatus in which a heating element generates bubbles in a liquid flow path to project droplets |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57201682A (en) * | 1981-06-08 | 1982-12-10 | Canon Inc | Ink cassette |
JPS58194550A (en) * | 1982-05-10 | 1983-11-12 | Canon Inc | Ink cassette for multicolor ink jet printer |
US4551735A (en) * | 1983-05-30 | 1985-11-05 | Canon Kabushiki Kaisha | Ink jet recording apparatus |
US4794409A (en) * | 1987-12-03 | 1988-12-27 | Hewlett-Packard Company | Ink jet pen having improved ink storage and distribution capabilities |
-
1991
- 1991-02-13 DE DE1991622523 patent/DE69122523T2/en not_active Expired - Fee Related
- 1991-02-13 DE DE1991630429 patent/DE69130429T2/en not_active Expired - Fee Related
- 1991-02-13 EP EP19910102045 patent/EP0442485B1/en not_active Expired - Lifetime
- 1991-02-13 EP EP95110640A patent/EP0684139B1/en not_active Expired - Lifetime
Patent Citations (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4723129A (en) | 1977-10-03 | 1988-02-02 | Canon Kabushiki Kaisha | Bubble jet recording method and apparatus in which a heating element generates bubbles in a liquid flow path to project droplets |
US4740796A (en) | 1977-10-03 | 1988-04-26 | Canon Kabushiki Kaisha | Bubble jet recording method and apparatus in which a heating element generates bubbles in multiple liquid flow paths to project droplets |
JPS54139530A (en) * | 1978-04-20 | 1979-10-30 | Ricoh Co Ltd | Abnormal state detector of ink jet recorder |
JPS54139533A (en) * | 1978-04-20 | 1979-10-30 | Ricoh Co Ltd | Air bubble remover of ink jet recorder |
US4459600A (en) | 1978-10-31 | 1984-07-10 | Canon Kabushiki Kaisha | Liquid jet recording device |
US4345262A (en) | 1979-02-19 | 1982-08-17 | Canon Kabushiki Kaisha | Ink jet recording method |
US4463359A (en) | 1979-04-02 | 1984-07-31 | Canon Kabushiki Kaisha | Droplet generating method and apparatus thereof |
US4313124A (en) | 1979-05-18 | 1982-01-26 | Canon Kabushiki Kaisha | Liquid jet recording process and liquid jet recording head |
JPS5613456A (en) | 1979-07-16 | 1981-02-09 | Mitsubishi Alum Co Ltd | Aluminum alloy for brazing filler metal of brazing sheet |
JPS5641148A (en) | 1979-09-12 | 1981-04-17 | Canon Kk | Vessel for recording liquid |
US4558333A (en) | 1981-07-09 | 1985-12-10 | Canon Kabushiki Kaisha | Liquid jet recording head |
JPS59123670A (en) | 1982-12-28 | 1984-07-17 | Canon Inc | Ink jet head |
JPS59138461A (en) | 1983-01-28 | 1984-08-08 | Canon Inc | Liquid jet recording apparatus |
JPS60137658A (en) | 1983-12-26 | 1985-07-22 | Canon Inc | Ink supplier |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 3, no. 159 (E - 162) 27 December 1979 (1979-12-27) * |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0778141A1 (en) * | 1995-12-04 | 1997-06-11 | Hewlett-Packard Company | Out-of-ink sensing system for an ink-jet printer |
US5844580A (en) * | 1995-12-04 | 1998-12-01 | Hewlett Packard Co | Ink container configured for use with a printing device having an out-of-ink sensing system |
US5844579A (en) * | 1995-12-04 | 1998-12-01 | Hewlett-Packard Company | Out-of-ink sensing system for an ink-jet printer |
EP0997286A1 (en) * | 1996-12-24 | 2000-05-03 | Seiko Epson Corporation | Ink-jet recording apparatus |
US6305778B1 (en) | 1996-12-24 | 2001-10-23 | Seiko Epson Corporation | Ink-jet recording apparatus |
EP0860283A1 (en) * | 1997-02-19 | 1998-08-26 | Canon Kabushiki Kaisha | Ink jet recording apparatus, and method for recovering an ink jet recording head |
US5984452A (en) * | 1997-02-19 | 1999-11-16 | Canon Kabushiki Kaisha | Ink jet recording apparatus, and a method for recovering an ink jet recording head |
EP0913262A1 (en) * | 1997-10-31 | 1999-05-06 | Hewlett-Packard Company | Narrow and wide wiper blade cleaning system for ink jet printheads |
Also Published As
Publication number | Publication date |
---|---|
EP0442485B1 (en) | 1996-10-09 |
EP0684139B1 (en) | 1998-10-28 |
EP0442485A3 (en) | 1991-10-23 |
DE69130429D1 (en) | 1998-12-03 |
DE69122523T2 (en) | 1997-02-27 |
DE69130429T2 (en) | 1999-05-27 |
EP0442485A2 (en) | 1991-08-21 |
DE69122523D1 (en) | 1996-11-14 |
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