JP2006347119A - Recorder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a recording image which produces a good image result by preventing spur traces from generating regardless of the recording paper conveyance direction, and making improvement in the conveyance precision at a discharging roller and a spur. <P>SOLUTION: In the recorder which has a conveyance roller that conveys a sheet at the downstream side in the conveyance direction more than a recording means, and the spur for pressing the recording sheet to the conveyance roller, the recorder has a spur holder which holds the spur. A shape is formed at a part of the spur holder, which carries out positional regulation in the thrust direction of the spur at an upper part of a rotary shaft of the spur and only at a central part. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a recording apparatus related to a sheet conveying apparatus having a conveying means for conveying a sheet on the downstream side in the conveying direction with respect to the recording means. For example, a recording medium recorded in a recording apparatus such as a facsimile, a copying machine, or a printer is used. The present invention relates to a transport device for discharging and transporting.

  An inkjet recording apparatus feeds a recording medium from an automatic sheet feeding apparatus in which a plurality of recording sheets are stacked on a tray, and is mounted on a carriage supported so as to be able to reciprocate in a print area on the fed recording medium. The recording head mounted on the recording medium ejects liquid ink onto the recording medium to record an image, and after the recording of the image for one line is completed, a predetermined amount of recording medium is sent, and all of the recording of the image data is performed. It is formed by repeating until it is finished.

  FIG. 9 is a conventional side view, and FIG. 10 is a conventional top view. In these drawings, a spur 1001 that sandwiches and conveys the paper discharge roller 41 and the recording paper on the downstream side of the recording head includes a circular metal sheet having a plurality of tooth tip shapes arranged at equal pitches and the metal sheet. An integrally molded mold member that is rotatably supported. The spur tooth tip shape is sharp so that there is no transfer of ink from the recorded material, and the spring shaft inserted in the center is the center of rotation and rotates in conjunction with the movement of the recording paper. And transport the recording paper. Further, the spur is regulated by the thrust regulating wall 1004A of the spur base 1004 so that the rolling direction coincides with the paper discharge direction A.

  However, in such a conventional recording apparatus, as shown in FIG. 11, the thrust regulating wall 1004A of the spur base 1004 is shifted obliquely with respect to the sheet discharge direction A, and the rolling direction of the spur 1001 and the sheet discharge In some cases, the direction A deviates by an angle θ. This may occur due to shape deformation due to component accuracy or environmental changes, or oblique sheet conveyance, and the rotation direction of the spur 1001 may not completely coincide with the sheet discharge direction A.

If the rotation direction of the spur 1001 and the sheet discharge direction A do not coincide with each other in this way, the sheet discharge direction A between the spur 1001 contact with the print surface of the sheet and the separation thereof. Therefore, especially when printing on soft recording paper with a surface layer, the ink receiving layer on the surface peels off, and white dotted spur traces may be generated on the printing surface. there were. In addition, the spur may not rotate smoothly due to a large rotational resistance from the spur base. Therefore, as described in Patent Document 1, a configuration is used in which when a recording sheet is conveyed in the paper discharge direction, the spur smoothly rotates to avoid the spur trace.
JP 2001-58749 A JP 2002-96513 A

  However, in recent inkjet recording apparatuses compatible with automatic duplex printing, not only the recording paper is conveyed in the paper ejection direction, but also the recording paper after printing is conveyed in reverse in the direction opposite to the paper ejection side, The reverse side printing and the reverse side printing are now being carried out. For this reason, it has been difficult to sufficiently avoid the occurrence of spur traces during reverse conveyance in the conventional configuration in which only one direction of normal conveyance is considered. In view of this, there has been a demand for a configuration in which a spur trace is not generated even when the recording sheet after printing is conveyed in the reverse direction as well as in the normal direction. Also, borderless printing has become common with the spread of digital cameras. Therefore, it is necessary to further improve the conveyance accuracy of the rear end portion of the image that is conveyed by the paper discharge roller and the spur.

  Therefore, the present invention has been made in view of the above problems, and the object of the present invention is that the sheet can be conveyed without generating a spur mark on the surface regardless of the conveyance direction of the recording paper, It is an object of the present invention to provide a transport device capable of improving the transport accuracy in a paper discharge roller and a spur, and a recording apparatus including the transport device.

A typical configuration of the present invention for achieving the above object includes a recording roller having a conveying roller that conveys a sheet on the downstream side in the conveying direction from the recording unit, and a spur for pressing the recording sheet against the conveying roller. In the device
A spur holder for holding the spur is provided, and a shape for restricting the position of the spur in the thrust direction is provided in a part of the spur holder at an upper part of the rotation shaft of the spur and only at the center.

  According to the present invention, when the recording paper after printing is transported by the discharge roller and the spur, the spur is always kept at a position perpendicular to the recording paper regardless of the transport direction and the rotational resistance of the spur is reduced. Can do. Therefore, the contact area between the spur tooth tip and the recording paper printing surface can always be kept to a minimum, and the spur rotates smoothly, so that no spur mark is generated. At the same time, since the spur rotates smoothly, no recording paper conveyance resistance is generated, and good recording paper conveyance accuracy can be ensured.

  Therefore, it is possible to provide a recording apparatus with high reliability and capable of printing a good recorded image.

  Furthermore, by pressing a plurality of spurs toward the recording paper with one spring shaft, an appropriate spur pressing force can be applied in a small space. Therefore, it is possible to construct a transport device that saves space and does not generate spur traces.

  Furthermore, you may comprise a spur with the metal sheet member which consists of several tooth-tip shape, and the mold member which comprises a rotating shaft part.

  Further, by setting the tooth tip pitch to 1.3 mm or less, which is finer than the line feed pitch at the time of printing, one tooth tip always contacts the recording paper for each line feed, so that the spur rotates smoothly on the paper surface. Therefore, it becomes a structure which is hard to generate | occur | produce a spur trace further. Further, since the spur rotates smoothly, the paper feeding accuracy is improved.

  Further, a spur mold part is provided with a flange part for restricting the thrust position of the spur, and the spur holder position restricting member is set narrower in the recording paper conveying direction than the spur flange part, thereby causing a spur at the center part of the spur. Thus, even when the spur base is inclined with respect to the recording paper conveyance direction, the spur rotation resistance is small and no spur trace is generated.

  Furthermore, since the plurality of spurs are engaged so that the phases of the plurality of spur tooth tips are in phase, the load on the tooth tips received from the spring shaft is evenly distributed to both tooth tips. Furthermore, it becomes difficult to generate a spur trace.

  In addition, an automatic double-sided printing unit is provided to drive the transport roller in the reverse direction of normal printing after surface printing, and the spur rotates on the printed paper in the reverse direction to that of normal printing. May be.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

(First embodiment)
A first embodiment of the present invention will be described with reference to FIGS. 1 is a perspective view of a recording apparatus according to the first embodiment of the present invention, FIG. 2 is a perspective view of a mechanism portion of the recording apparatus according to the first embodiment of the present invention, and FIG. 3 is a first embodiment of the present invention. FIG. 4 to FIG. 6 are diagrams showing details of a spur base and a spur structure according to the present invention.

  The recording apparatus of the present invention includes a recording apparatus 1, a sheet feeding apparatus 2, a sheet feeding section 3, a carriage section 5, a sheet discharge section 4, a U-turn / automatic duplex conveying section 8, a cleaning section 6, a recording head 7, an exterior / electricity. Part 9. Then, these are divided into items and the outline is described sequentially.

(A) Paper Feed Unit The paper feed unit 2 returns the pressure plate 21 on which the sheet material P is stacked, the paper feed roller 28 that feeds the sheet material P, the separation roller 241 that separates the sheet material P, and the sheet material P back to the stacking position. Therefore, the return lever 22 and the like are attached to the base 20.

  A paper feed tray 26 for holding the stacked sheet materials P is attached to the base 20 or the exterior. The paper feed tray 26 is a multi-stage type and is pulled out for use.

  The paper feed roller 28 has a bar shape with a circular arc in cross section. One separation roller rubber is provided based on the sheet reference, and thereby the sheet material is fed. The drive to the paper feed roller 28 is transmitted by a drive transmission gear 271 and a planetary gear 272 from a motor (hereinafter referred to as an AP motor) 273 shared with a cleaning unit provided in the paper feed unit 2.

  A movable side guide 23 is movably provided on the pressure plate 21 to regulate the stacking position of the sheet material P. The pressure plate 21 can rotate about a rotation shaft coupled to the base 20 and is urged by the pressure plate spring 212 to the paper feed roller 28. A separation sheet 213 made of a material having a large coefficient of friction such as an artificial leather that prevents double feeding of the sheet material P near the end of the stack is provided at a portion of the pressure plate 21 that faces the sheet feeding roller 28. The pressure plate 21 is configured to be able to contact and separate from the paper feed roller 28 by a pressure plate cam 241.

  Further, a separation roller holder 24 attached with a separation roller 241 for separating the sheet material P one by one on the base 20 is rotatable about a rotation shaft provided on the separation base 20, and is separated by a separation roller spring 242. It is urged by the paper feed roller 28. The separation roller 241 has a configuration in which a clutch spring 243 is attached, and a portion to which the separation roller 241 is attached can rotate when a load exceeding a predetermined value is applied. The separation roller 241 can be brought into contact with and separated from the paper feed roller 28 by a separation roller release shaft 242 and a control cam 25. The positions of the pressure plate 21, the return lever 22, and the separation roller 241 are detected by the ASF sensor 29.

  A return lever 25 for returning the sheet material P to the stacking position is rotatably attached to the base 20 and is urged by a return lever spring 221 in the release direction. When returning the sheet material P, it is configured to rotate by the control cam 25.

  In a normal standby state, the pressure plate 28 is released by the pressure plate cam 214, the separation roller 241 is released by the control cam 25, and the return lever 22 returns the sheet material P so that the sheet material P does not enter the back during loading. It is provided at a loading position that closes the loading port. When paper feeding starts from this state, first, the separation roller 241 contacts the paper feeding roller 28 by driving the motor. Then, the return lever 22 is released, and the pressure plate 21 comes into contact with the paper feed roller 28. In this state, feeding of the sheet material P is started. The sheet material P is limited by the pre-stage separation unit 201 provided on the base 20, and only a predetermined number of the sheet material P is sent to the nip portion constituted by the paper feed roller 28 and the separation roller 241. The fed sheet material P is separated at the nip portion, and only the uppermost sheet material P is conveyed.

  When the sheet material P reaches a conveyance roller 36 and a pinch roller 37 described later, the pressure plate 21 is released by the pressure plate cam 213 and the separation roller 28 is released by the control cam 25. The return lever 22 is returned to the loading position by the control cam 25. At this time, the sheet material P that has reached the nip portion constituted by the paper feed roller 28 and the separation roller 241 can be returned to the stacking position.

(B) Paper feeding part The paper feeding part 3 is attached to the chassis 11 made of a bent metal sheet. The paper feeding unit 3 includes a conveyance roller 36 that conveys the sheet material P and a PE sensor 32. The transport roller 36 has a structure in which the surface of the metal shaft is coated with ceramic fine particles, and the metal portions of both shafts are received by the bearing 38 and attached to the chassis 11. A conveyance roller tension spring 381 is provided between the bearing 38 and the conveyance roller 36 in order to apply a load during rotation to the conveyance roller 36 so that stable conveyance can be performed, and a predetermined load is applied by urging the conveyance roller 36. Giving.

  The conveyance roller 36 is provided with a plurality of driven pinch rollers 37 in contact therewith. The pinch roller 37 is held by the pinch roller holder 30 and is urged by the pinch roller spring 31, so that the pinch roller 37 is in pressure contact with the transport roller 36 and generates the transport force of the sheet material P. At this time, the rotating shaft of the pinch roller holder 30 is attached to the bearing of the chassis 8 and rotates around the shaft. Further, a paper guide flapper 33 and a platen 34 for guiding the sheet material P are disposed at the entrance of the sheet feeding unit 3 to which the sheet material P is conveyed. Further, the pinch roller holder 30 is provided with a PE sensor lever 321 that transmits detection of the leading edge and trailing edge of the sheet P to the PE sensor 32. The platen 34 is attached to the chassis 11 and positioned. The paper guide flapper 33 engages with the transport roller 36 and can rotate around a bearing portion 331 that slides, and is positioned by contacting the chassis 11.

  In the above configuration, the sheet material P sent to the paper feeding unit 3 is guided by the pinch roller holder 30 and the paper guide flapper 33, and sent to the roller pair of the transport roller 36 and the pinch roller 37. At this time, the leading edge of the sheet material P conveyed by the PE sensor-lever 35 is detected, and thereby the printing position of the sheet material P is obtained. Further, the sheet material P is conveyed on the platen 34 by the roller pair 36 and 37 being rotated by the conveyance motor 35. On the platen 34, a rib serving as a conveyance reference surface is formed. The gap with the recording head 7 is managed, and the sheet material P is controlled in combination with a later-described paper discharge unit. And, it is configured so that the smashing does not become large.

  The drive to the transport roller 36 is transmitted by a timing belt 351 to a pulley 361 provided on the shaft of the transport roller 36 by a timing belt 351. A code wheel 362 on which markings are formed at a pitch of 150 to 300 lpi for detecting the amount of conveyance by the conveyance roller 36 is provided on the axis of the conveyance roller 36, and an encoder sensor 363 that reads the code wheel 362 serves as a code wheel. It is attached to the chassis 11 at the position 362 adjacent thereto.

  A recording head 7 that forms an image based on image information is provided on the downstream side of the conveying roller 36 in the sheet material conveying direction. As the recording head 7, an ink jet recording head equipped with a replaceable ink tank for each color ink tank is used. The recording head 7 can apply heat to the ink by a heater or the like. Then, the film of the ink is boiled by this heat, and the ink is ejected from the nozzle 70 of the recording head 7 by the pressure change caused by the growth or contraction of the bubbles due to the film boiling, and an image is formed on the sheet material P.

(C) Carriage unit The carriage unit 5 includes a carriage 50 to which the recording head 7 is attached. The carriage 50 is held by a guide shaft 52 for reciprocating scanning in a direction perpendicular to the conveying direction of the sheet material P, and a guide rail 111 that maintains the gap between the recording head 7 and the sheet material P by holding the rear end of the carriage 50. It is supported. The guide shaft 52 is attached to the chassis 11. The guide rail 111 is formed integrally with the chassis 11.

  The carriage 50 is driven via a timing belt 541 by a carriage motor 54 attached to the chassis 11. The timing belt 541 is stretched and supported by an idle pulley 542. The timing belt 542 is coupled to the carriage 50 via a damper 55 made of rubber or the like, and reduces image unevenness by attenuating vibration of the carriage motor 54 or the like. A code strip 561 in which markings are formed at a pitch of 150 to 300 lpi for detecting the position of the carriage 50 is provided in parallel with the timing belt 541. In addition, an encoder sensor 56 for reading it is provided on a carriage substrate 92 mounted on the carriage 50. The carriage substrate 92 is also provided with contacts 921 for electrical connection with the recording head 7. Further, the carriage 50 is provided with a flexible substrate 57 for transmitting a recording head 7 head signal from the electric substrate 9.

  In order to fix the recording head 7 to the carriage 50, the carriage 50 is provided with pressing means 511 for pressing and fixing the abutting portion 501 for positioning. The pressing means 511 is mounted on the head set lever 51 and is configured to act on the recording head 7 when the head set lever 51 is turned around the rotation fulcrum and set.

  Further, eccentric cams 521 are provided at both ends of the guide shaft 52, and the guide shaft 52 is moved up and down by transmitting the drive to the eccentric cam 521 through the gear train 591 by the main cam 63 of the cleaning unit 6. be able to. As a result, the carriage 50 can be moved up and down to form an optimum gap even for the sheet material P having a different thickness.

  Further, an automatic registration adjustment sensor 59 for automatically correcting the landing deviation of the ink ejected from the recording head 7 on the recording sheet P is attached to the carriage 50. The sensor 59 is a reflection type optical sensor, and an optimal registration adjustment value can be obtained by emitting light from the light emitting element and receiving reflected light to a predetermined print pattern on the recording sheet P.

  In the above configuration, when an image is formed on the sheet material P, the roller pairs 36 and 37 convey the sheet material P to the row position (position in the conveyance direction of the sheet material P) where the image is formed and the carriage 50 is moved by the carriage motor 80. The recording head 7 is moved to the row position for image formation (position perpendicular to the conveying direction of the sheet material P), and the recording head 7 is opposed to the image formation position. Thereafter, as described above, the recording head 7 ejects ink toward the sheet material P in accordance with a signal from the electric substrate 9 to form an image.

(D) Paper discharge unit The paper discharge unit 4 is a spur 1001 configured to be able to rotate by being driven by a predetermined pressure against the two paper discharge rollers 40 and 41, the paper discharge rollers 40 and 41, and a transport roller. Is composed of a gear train for transmitting the driving of the paper discharge rollers 40 and 41, and the like.

  The paper discharge rollers 40 and 41 are attached to the platen 34. The discharge roller 40 on the downstream side in the conveyance direction of the recording sheet P is provided with a plurality of rubber portions 401 on a metal shaft. The drive from the transport roller 36 is driven by being transmitted to the paper discharge roller 40 via the idler gear. The paper discharge roller 41 provided on the upstream side of the paper discharge roller 40 has a structure in which a plurality of elastomer elastic bodies 411 are attached to a resin shaft. Drive to the paper discharge roller 41 is transmitted from the paper discharge roller 40 via an idler gear.

  A spur 1001 is a SUS thin plate provided with a plurality of convex shapes around it, is integrally molded with a resin portion, and is attached to a spur holder 1004. A spur spring 1003 provided with a coil spring in a bar shape causes the spur 1001 to be attached to the spur holder 1004 and pressed against the discharge rollers 40 and 41 and the like. A spur is provided at a position corresponding to the rubber part and the elastic part of the paper discharge rollers 40 and 41, and mainly serves to generate the conveying force of the sheet material P, and the rubber of the paper discharge rollers 40 and 41 therebetween. The portion 401 and the elastic body portion 411 are provided at positions where the sheet body P is not printed, and mainly serves to suppress lifting when the sheet material P is printed.

  With the above configuration, the sheet material P on which an image is formed by the carriage unit 5 is sandwiched by the nip between the paper discharge roller 41 and the spur 1001, conveyed, and discharged to the paper discharge tray 46. The paper discharge tray 46 is configured to be housed in the front cover 95. When used, pull out. The sheet discharge tray 46 increases in height toward the leading end, and both ends thereof are configured to be high in height so that the stackability of the discharged sheet material P can be improved and the printing surface can be prevented from rubbing.

(E) The sheet material P is stored in a cassette 81 provided in front of the U-turn / automatic double-sided unit. In order to separate and feed the sheet material P, a pressure plate 822 on which the sheet material P is stacked and brought into contact with the sheet feeding roller 821 is provided in the cassette 81. A sheet feeding roller 821 that feeds the sheet material P, a separation roller 831 that separates the sheet material P, a return lever 824 for returning the sheet material P to the stacking position, a pressurizing / controlling unit 825 for the pressure plate 822, and the like are main bodies. The UT base 84 is attached.

  The cassette 81 has a two-stage contraction configuration, and can be selectively used depending on the size of the recording sheet P. When the small size paper or the cassette is not used, the cassette 81 contracts and can be stored inside the main body exterior portion 9.

  The paper feed roller 821 has a bar shape with a circular arc in cross section. One separation roller rubber is provided based on the sheet reference, and thereby the sheet material is fed. The drive to the sheet feeding roller 821 is transmitted from a U-turn / automatic double-side motor 85 provided on the U-turn / automatic double-side unit 5 by a drive transmission gear 851, a planetary gear 852, and the like.

  A movable side guide 827 is movably provided on the pressure plate 822 to regulate the stacking position of the sheet material P. The pressure plate 822 is rotatable about a rotation shaft coupled to the cassette 81, and is urged against the paper feed roller 821 by a pressure / control means 825 including a pressure plate spring 828 provided on the UT base 84. A separation sheet 829 made of a material having a large coefficient of friction such as an artificial leather that prevents double feeding of the sheet material P near the end of the stack is provided at a portion of the pressure plate 822 that faces the paper feed roller 821. The pressure plate 822 can be brought into contact with and separated from the paper feed roller 821 by a pressure plate cam 836.

  Further, the UT base 83 has a separation roller holder 833 attached with a separation roller 831 for separating the sheet material P one by one, and can rotate around a rotation shaft provided on the separation base 83, and a separation roller spring 837. By this, the sheet feeding roller 821 is urged. The separation roller 831 has a configuration in which a clutch spring 834 is attached, and a portion to which the separation roller 831 is attached can rotate when a load greater than a predetermined value is applied. The separation roller 241 is configured to come into contact with and separate from the paper feed roller 821 by a separation roller release shaft 835 and a control cam 836. The positions of the pressure plate 822 and the return lever 824 separation roller 831 are detected by the UT sensor 841.

  A return lever 824 for returning the sheet material P to the stacking position is rotatably attached to the UT base 83 and is urged by a return lever spring 823 in the release direction. When the sheet material P is returned, it is configured to rotate by the control cam 836.

  In a normal standby state, the pressure plate 822 is released by the pressure plate cam 836, the separation roller 831 is released by the control cam 836, and the return lever 824 returns the sheet material P so that the sheet material P does not enter the back during loading. It is provided at a loading position that closes the loading port. When paper feeding starts from this state, the motor first drives to contact the separation roller 831 paper feeding roller 821. Then, the return lever 824 is released, and the pressure plate 822 comes into contact with the paper feed roller 821. In this state, feeding of the sheet material P is started. The sheet material P is limited by the front-stage restricting means 838 provided on the base 83, and only a predetermined number of the sheet material P is sent to the nip portion constituted by the sheet feed roller 821 separation roller 831. The fed sheet material P is separated at the nip portion, and only the uppermost sheet material P is conveyed.

  When the separated and conveyed sheet material P reaches a later-described U-turn intermediate roller (1) 86 and U-turn pinch roller 861, the pressure plate 822 is released by the pressure plate cam 826, and the separation roller 831 is released by the control cam 836. The return lever 824 is returned to the loading position by the control cam 836. At this time, the sheet material P that has reached the nip portion composed of the paper feed roller 821 and the separation roller 831 can be returned to the stacking position.

  On the downstream side of the sheet feeding portion, there are two conveying rollers, a U-turn intermediate roller (2) 87 and a U-turn intermediate roller (2) 87, for conveying the sheet material fed and conveyed. Yes. In these, EPDM having a rubber hardness of 40 to 80 ° is attached to 4 to 6 locations on the core of the metal shaft. U-turn pinch rollers 861 and 871 for sandwiching the sheet material P at positions corresponding to the rubber portions are attached to the spring shaft, and are attached to the U-turn intermediate roller (1) 86 and the U-turn intermediate roller (2) 87. Energized. In order to form a transport path, an inner guide 881 that forms the inner side and an outer guide 882 that forms the outer side are configured.

  The junction point of the paper path with the paper feed unit 2 described above is configured by a flapper 883 so that the mutual path merges smoothly. When the leading edge of the recording sheet P is fed to the above-described conveyance roller 36 and pinch roller 37, the recording sheet P is brought into contact with the nip of the stopped roller pair, and the registration operation is performed.

  While being transported by the transport roller 36 and the pinch roller 37 described above, the printed sheet material P passes through the transport roller 36 and the pinch roller 37. At the time of automatic double-sided printing, the rear end of the sheet material P is again sandwiched between the conveyance roller 36 and the pinch roller 37 and conveyed. At this time, the pinch roller 37 can be smoothly conveyed because the sheet material P is fed into the rising portion by the lifting mechanism 884.

  The sheet material P sent in again is sandwiched between the double-sided roller 891 and the pinch roller 892 and conveyed. The sheet material P is guided by the guide 893 and conveyed. The double-sided paper conveyance path is configured to merge with the paper path at the time of U-turn conveyance after a predetermined amount. Therefore, the subsequent configuration and operation of the paper path are the same as those described above.

(F) Cleaning unit The cleaning unit 6 includes a pump 60 for cleaning the recording head 7, a cap 61 for suppressing the drying of the recording head 7, a blade 62 for cleaning the face surface around the nozzles of the recording head 7, and the like. It is composed of

  The main drive of the cleaning unit is transmitted from the aforementioned AP motor 273. Basically, the one-way clutch 691 is provided so that the pump operates by rotation in one direction, and the blade 62 operation and the cap 61 elevating operation act by rotation in another direction.

  The pump 60 is configured to generate a negative pressure by squeezing two tubes 67 with a pump roller 68, and is connected from the cap 61 to the pump 60 through a valve 65 or the like. When the pump 60 is operated with the cap 61 in close contact with the recording head 7, unnecessary ink or the like is sucked from the recording head 7. A cap absorber 611 is provided in the cap 61 portion in order to reduce the remaining ink on the face surface of the head 7 after suction. For this reason, the ink remaining in the cap 61 is sucked in a state where the cap 61 is opened so that the ink remains stuck and does not cause any harmful effects. The waste ink sucked by the pump 60 is absorbed and held in a waste ink absorber 991 provided in a lower case 99 described later.

  A series of operations such as the blade 62 operation and the cap 61 elevating operation are controlled by a main cam 63 provided with a plurality of cams on the shaft. The cam and arm of each part are acted on the main cam to perform a predetermined operation. The position of the main cam 63 can be detected by a position detection sensor 64 such as a photo interrupter. When the cap 61 descends, the blade 62 moves perpendicularly to the scanning direction of the carriage 5 to clean the face surface of the recording head 7. Plural blades 62 are provided for cleaning the vicinity of the nozzles of the recording head 7 and for cleaning the entire face surface. Then, when it moves to the innermost position, it can come into contact with the blade cleaner 66 to remove ink or the like adhering to the blade 62 itself.

  The drive transmission and control for opening and closing the valve 65 is performed by the paper discharge roller 40. By selecting the valve 65, it is possible to cope with collective suction for all colors and individual suction for each color as necessary. Valve detection is performed by a valve position detection sensor 651.

(G) Exterior part Each of the above-described units is incorporated in the chassis 11 and forms a mechanism part of the printer. The exterior is attached so that the circumference may be covered. The exterior mainly includes a lower case 99, an upper case 98, an access cover 97, a connector cover 96, a front cover 95, and a side cover 93.

  The front cover 96 is configured so that the paper discharge tray 46 can be stored, and is configured to close the paper discharge port when not in use. The open / closed state of the front cover 95 can be detected by a sensor (not shown).

  An access cover 97 is attached to the upper case 98 and is configured to be rotatable. A part of the upper surface of the upper case has an opening, and the ink tank 71 and the recording head 7 are configured to be exchangeable at this position. Further, the upper case 98 is provided with a door switch lever 981 for detecting opening / closing of the access cover, an LED guide 982 for transmitting / displaying LED light, a key switch 983 for acting on the SW of the board, and the like. Further, the paper feed tray 26 is rotatably attached to the upper case 98. When the paper feed unit is not used, the paper feed tray 26 is configured to be a cover of the paper feed unit if it is stored.

  Further, the upper case 98 and the lower case 99 are attached with elastic fitting claws. A connector cover 96 covers a portion in which the connector portion is provided.

  The side cover 93 is attached so as to cover the upper case 98 and the lower case 99 from the left and right.

  Next, details of the configuration of the spur according to the present invention will be described with reference to FIGS.

  FIG. 4 shows the shape of a spur 1001 for realizing the embodiment of the present invention. In the figure, reference numeral 1001A denotes a metal sheet having a sharp tooth tip shape arranged at an equal pitch, and the tooth tip shape is formed by etching or pressing. In the figure, only a part of the tooth tip shape is shown for simplification, but in actuality, the tooth tip portion is arranged at equal intervals over one circumference of 360 degrees so that the tooth tip portion is on the circumference of an arbitrary diameter φD. Yes. Reference numeral 1001B denotes a mold resin portion formed integrally with the metal sheet 1001A, and a shaft hole portion 1001E that is concentric with a tooth-shaped circle is formed so that the metal sheet 1001A can freely rotate. Yes. A spring shaft 1003 which will be described later is passed through the shaft hole portion 1001E. The spur 1001 rotates around the spring shaft, and the spur is pressed toward the recording paper by the spring pressure to generate a recording paper conveying force. 1001F is a spur flange portion as a part of the mold portion.

  FIG. 8 is a schematic diagram when two spurs 1001 are integrally transporting the recording paper, and the recording paper is nipped together with the paper discharge roller 41 and moved in the transport direction. In the figure, two spurs 1001 form a rotation center with one spring shaft 1003 and apply a pressing force in the direction of the recording paper. This is a configuration for generating an effective pressing force on the recording paper with a small space and the number of parts. If a large spring pressure is applied to one spur, too much force is applied to the tooth tip, and the surface of the recording paper is easily damaged. However, the recording paper cannot be accurately conveyed unless a pressing force of a predetermined pressure or more is applied to the recording paper. For this reason, simply increasing the number of spurs and springs increases the number of parts and the space, which is not practical. Therefore, by adopting a configuration in which two spurs are set on one spring in this configuration, an appropriate spur pressing force can be applied in a small space.

  Reference numeral 1004 denotes a spur base that supports a spring shaft 1003 that supports the spur. The spur base 1004 supports both ends of the spring shaft 1003. When the recording paper is inserted into the nip formed by the spur and the paper discharge roller, the spring shaft 1003 is deformed according to the thickness of the recording paper. The spur is pressed against the recording sheet and the position of the spur in the lateral direction (thrust direction with respect to the spur's rotation axis) is regulated.

  Here, in the case of the conventional configuration, as shown in FIG. 8, since the spur pressing force is generated by bending the spring shaft, the spur rotation shaft (hole) is formed by two spurs along the bent spring shaft. The upper part of the center of the rotation is separated, and the spur cannot maintain the vertical position with respect to the recording paper. For this reason, the tooth tip is obliquely abutted against the printed paper surface, and the paper surface is scraped off over a large area, resulting in spur traces.

  Therefore, in this embodiment, as shown in FIG. 5, a spur thrust position restriction 1004A is provided on the spur base. The thrust position restriction 1004A is set at a position above the rotation center 1001E of the spur and abuts against the flange portion 1001F. The lower parts of the two spurs try to contact each other by the force of the spring shaft. Due to position restrictions, the two spurs are not separated. Therefore, the two spurs can always maintain a vertical position with respect to the recording paper, and the spur tooth tip contacts the recording paper in the vertical direction, which is the minimum area, so that no spur trace is generated. Although it is possible to make the lower part of the spur holder contact the spur, the lower part does not need to be held in the thrust direction as described above. It will be necessary to produce it. In the case of a mold material, it is difficult to obtain accuracy over a wide range, and since the yield decreases and the cost increases, a configuration in which only a necessary part is in contact with the entire region is preferable. That is, as in this embodiment, in a state in which the spur is viewed from the front, it is preferable that thrust control is performed by the spur base above the spur rotation shaft and a space is provided at the lower part to escape.

  Moreover, FIG. 6 is the figure which looked at the spur part from the upper direction. The aforementioned spur thrust positioning portion 1004A is configured to contact the vicinity of the spur center when viewed from above. In other words, the space is provided except for the vicinity of the center of the spur rotation axis. In the conventional configuration, when the spur base is inclined with respect to the traveling direction of the recording paper due to component variations, the spur rotation resistance increases when the outer side of the spur mold portion comes into contact with the spur base. For this reason, it is difficult for the spur to rotate smoothly, and there is a possibility that a spur mark is generated when the recording paper surface after printing bites into the spur tooth tip. In this embodiment, since the spur thrust position restriction 1004A is configured to contact the vicinity of the spur center when viewed from above, the spur rotation resistance does not increase greatly even when the spur base is inclined, and the spur is always smooth. The spur trace is not generated, and the paper feeding and conveying accuracy by the paper discharge roller and the spur is improved.

  Further, the line feed pitch at the time of recording in this embodiment is 600 dpi 32-dot feed, that is, about 1.35 mm, and the spur tooth tip pitch is 1.2 mm smaller than this. For this reason, since one tooth tip always contacts the recording paper for each line feed, the spur rotates smoothly on the paper surface. Therefore, it becomes a structure which is hard to generate | occur | produce a spur trace further. Further, since the spur rotates smoothly, the paper feeding accuracy is improved. As a result, a recording apparatus that produces a good image result can be provided.

[Second Embodiment]
As shown in FIG. 7, phase adjustment may be provided for two spurs so that the spur tooth tips have the same phase. The boss 1001G and the hole 1001F are provided in the spur mold part at two locations for positioning of the tooth tip phase alignment.

  In this way, by making the tooth tips in the same phase, the load on the tooth tips received from the spring shaft is evenly distributed to both the tooth tips, so that spur traces are less likely to occur.

Other Embodiment
In the above-described embodiment, the type and number of recording heads have not been specifically exemplified and described. However, the present invention is not limited to an inkjet recording apparatus that uses one recording head, and a plurality of recording heads that record with different color inks. Applicable regardless of the type and number of recording heads, such as inkjet recording apparatuses for color recording using recording heads, or inkjet recording apparatuses for gradation recording using a plurality of recording heads that record with the same color and different densities. And the above-described effects can be achieved.

  Further, as the recording means (recording head), the recording type and the recording head and the ink tank are integrated, or the recording head and the ink tank are separated and connected by an ink supply tube. Whatever the configuration of the ink tank, it can be similarly applied and the same effect can be achieved.

  In addition, when the present invention is applied to an ink jet recording apparatus, it can be applied to, for example, a recording unit that uses an electromechanical transducer such as a piezo element. In particular, ink is ejected using thermal energy. In the ink jet recording apparatus using the recording means of the above system, an excellent effect is brought about. This is because such a system can achieve higher recording density and higher definition.

  Furthermore, the present invention can be effectively applied to a full-line type recording head having a length corresponding to the maximum width of a recording medium that can be recorded by the recording apparatus. As such a recording head, either a configuration satisfying the length by a combination of a plurality of recording heads or a configuration as a single recording head formed integrally may be used. In addition, even with the serial type described above, the recording head fixed to the main body of the apparatus, or the replacement that enables the electrical connection with the main body of the apparatus and the supply of ink from the main body of the apparatus when mounted on the main body. The present invention is also effective when a free chip type recording head or a cartridge type recording head in which an ink tank is integrally provided in the recording head itself is used.

  Further, as the form of the above-described ink jet recording apparatus, in addition to those used as image output terminal devices of information processing devices such as computers, ink jet input / output apparatuses and readers that can mount a scanner other than the recording head on the carriage Or a facsimile apparatus having a transmission / reception function.

  In the above-described embodiment, the inkjet recording method is exemplified as the recording method. However, the present invention is not limited to this, and other thermal transfer recording methods, thermal recording methods, and impact recording methods such as a wire dot recording method, Other recording methods such as an electrophotographic method can also be applied.

  Note that the numerical values, materials, and the like described in the present embodiment are given as an example, and need not be limited to these numerical values, materials, and the like.

1 is a perspective view of a recording apparatus according to a first embodiment of the present invention. The perspective view of the mechanism part of the recording device in 1st Example of this invention. Sectional drawing of the recording device in 1st Example of this invention Front view and sectional view of a spur in the first embodiment of the present invention. Spur and spur base explanation front view in the first embodiment of the present invention Top view of the spur and spur base in the first embodiment of the present invention Front view and side view of spur in second embodiment of the present invention Conventional configuration diagram Conventional configuration diagram Conventional configuration diagram Conventional configuration diagram

Explanation of symbols

2 Paper feeding device 3 Paper feeding section 4 Paper ejection section 5 Carriage section 6 Cleaning section 7 Recording head 8 U-turn / automatic double-side section 9 Exterior / electric section 11 Chassis 111 Guide rail 20 Base 201 Pre-stage separation section 21 Pressure plate 211 Knurling section 212 Pressure plate spring 213 Separation sheet 214 Pressure plate cam 22 Return lever 221 Return lever spring 23 Movable side guide 231 Sheet guide portion 232 Knurling portion 233 Operation portion 24 Separation roller holder 241 Separation roller 242 Separation roller spring 243 Separation roller clutch 244 Separation roller release shaft 245 Separation roller shaft 25 Control cam 26 Paper feed tray 27 Drive unit 271 Drive transmission gear 272 Planetary gear 273 AP (paper feed / cleaning) motor 28 Paper feed roller 281 Paper feed roller rubber 29 ASF sensor 30 Pinch roller holder 31 Pinch roller spring 32 PE sensor 321 PE sensor lever 33 Paper guide flapper 331 Bearing portion 34 Platen 342 Conveying roller attaching portion 343 Chassis attaching shaft 344 Platen absorber 35 Conveying motor 36 Conveying roller 361 Pulley 362 Code wheel 37 Pinch roller 38 Bearing 381 Roller tension spring 39 Encoder sensor 40 Paper discharge roller 1
41 Paper discharge roller 2
42 spur 43 spur holder 44 spur spring 45 paper end support 451 paper end support roller 452 paper end support spring 46 paper discharge tray 50 carriage 501 abutting portion 51 head set lever 511 head pressing means 52 guide shaft 521 eccentric cam 53 conveyance amount correction Sensor 54 Carriage motor 541 Timing belt 542 Idle pulley 55 Carriage damper 56 Encoder sensor 561 Code strip 57 Flexible board 58 Carriage lift motor 581 Drive gear train 59 Automatic registration adjustment sensor 60 Pump 61 Cap 611 Cap absorber 62 Blade 63 Main cam 64 Position detection Sensor 65 Valve 651 Valve position detection sensor 66 Blade cleaner 67 Tube 68 Pump roller 69 Cleaning motor 691 One-way clutch 71 Ink tank 81 Cassette 821 Feed roller 822 Pressure plate 823 Return lever spring 824 Return lever 825 Pressure plate pressurization / control means 826 Pressure plate cam 827 Side guide 828 Pressure plate spring 829 Separation sheet 831 Separation roller 832 Separation base 833 Separation roller holder 834 Clutch spring 835 Separation roller release shaft 836 Control cam 837 Separation roller spring 838 Pre-stage regulating means 84 UT base 841 UT sensor 85 UT / double-sided motor 851 Drive gear 852 Planetary gear 86 U-turn intermediate roller (1)
861 U-turn pinch roller 87 U-turn intermediate roller (2)
871 U-turn pinch roller 881 Inner guide 882 Outer guide 883 Flapper 884 Pinch roller lifting mechanism 891 Double-sided roller 892 Double-sided pinch roller 893 Double-sided guide 91 Main board 92 Carriage board 921 Contact 93 Side cover 95 Front cover 96 Connector cover 97 Access cover 98 Top Case 981 Door switch lever 982 LED guide 983 Key switch 99 Lower case 991 Waste ink absorber 1001 Spur 1001A Spur tooth tip metal part 1001B Spur mold part 1001C Spur engagement convex shape 1001D Spur engagement concave shape 1001E Spur spring shaft Through hole 1001F Spur flange 1001G Spur boss 1001H Spur hole 1003 Spring shaft 1004 Spur base 1004A Strike position regulating portion

Claims (7)

In a recording apparatus having a conveyance roller for conveying a sheet on the downstream side in the conveyance direction from the recording means, and having a spur for pressing the recording sheet against the conveyance roller,
A recording apparatus comprising a spur holder for holding the spur, wherein a part of the spur holder is provided with a shape for restricting a position of the spur in a thrust direction only at a central portion and an upper part of a rotation shaft of the spur. .   The recording apparatus according to claim 1, wherein the rotation centers of the plurality of spurs are pressed toward the recording paper by one spring shaft.   The recording apparatus according to claim 1, wherein the spur includes a metal sheet member having a plurality of tooth tip shapes and a mold member constituting a rotating shaft portion.   The recording apparatus according to claim 1, wherein a tooth tip pitch of the spur is 1.3 mm or less smaller than a line feed pitch at the time of printing.   The spur mold part is provided with a flange part for restricting the thrust position of the spur, and the position restricting member of the spur holder is narrower in the recording paper conveying direction than the spur flange part. The recording apparatus according to any one of the above.   The recording apparatus according to claim 1, wherein a plurality of spurs are engaged so that phases of the plurality of spur teeth are the same.   It is equipped with an automatic double-sided printing unit that drives the transport roller in the reverse direction of normal printing after surface printing, and the spur rotates on the printed paper in the reverse direction to that of normal printing. The recording apparatus according to claim 1, wherein the recording apparatus is a recording apparatus.

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