CN1990366A

CN1990366A - Sheet-conveying device

Info

Publication number: CN1990366A
Application number: CNA2006101721101A
Authority: CN
Inventors: 寺田宏平
Original assignee: Brother Industries Ltd
Current assignee: Brother Industries Ltd
Priority date: 2005-12-27
Filing date: 2006-12-27
Publication date: 2007-07-04
Anticipated expiration: 2026-12-27
Also published as: JP4225316B2; US20070145678A1; CN1990366B; EP1803670A1; JP2007176645A; EP1803670B1

Abstract

A drive roller and the follower roller defines a nip line therebetween. A recording medium has a leading edge provided with a first corner contactable with the drive roller and a second corner contactable with the follower roller at a contact line when the drive roller and the follower roller provide the nip line. A supporting unit supports the follower roller and is capable of retracting the follower roller away from the nip line in a retracting plane. The retracting plane contains the axis of the follower roller. An angle Alpha1 and Alpha2 greater than the angle Alpha1 is defined between the retracting plane and an imaginary plane that contains the axes of the drive roller and follower roller. The supporting unit allows the follower roller to be retracted in a downstream side of the paper conveying direction with respect to the imaginary plane. The angle Alpha1 is greater than an angle Beta defined between the imaginary plane and a radial plane passing through the second axis and the contact line.

Description

Sheet material conveyor

The cross reference of related application

The application has required the preceence of the Japanese patent application No.2005-376678 of submission on December 27th, 2005.Should here be cited as a reference at the full content of first to file.

Technical field

The present invention relates to sheet material conveyor, be used between driven roller and driven voller clamping and carry sheet medium, this driven voller pressure contact driven roller, and follow the rotation of driven roller.The invention still further relates to the image recording structure that is equipped with this sheet material conveyor, and relate in particular to and be used for driven voller is pressed against structure on the driven roller.

Background technology

Fig. 1 (a)-1 (c) illustrates the example of traditional ink jet image recording device.This image recording structure comprises: platen 102 is used for supporting recording paper S during image recording; Header record 100 is used for from nozzle ink jet to recording paper S, to form image on recording paper S; And balladeur train 101, it is supporting header record 100.Balladeur train 101 can be along opening the direction (fore-and-aft direction of S with feeding recordable paper; Being called as " sub scanning direction " below) vertical direction is (with the vertical direction of drawing among Fig. 1 (a); Be called as " main scanning direction " below) slide.After the carton (not shown) supplied to platen 102, recording paper S carried specified amount off and on platen 102 at recording paper S.When each recording paper S suspended between intermittent delivery, balladeur train 101 slided along main scanning direction, simultaneously header record 100 by nozzle with ink jet to recording paper S, once form a dot image thus.

Be arranged on by throughput direction along recording paper S platen 102 upstream side a pair of conveying roller 103 and be arranged on the downstream of platen 102 a pair of distributing roller 104 off and on feeding recordable paper open S.The rotation of controller (not shown) control conveying roller 103 and distributing roller 104.

Conveying roller 103 is made of driven roller 105 and driven voller 106, and this driven roller 105 is rotated by the drive force of coming from the motor transmission, and this driven voller 106 is pressed against on the driven roller 105 by disc spring 107.Shown in Fig. 1 (a), when the leading edge of the recording paper S that supplies with from carton during near the contact area between conveying roller 103, conveying roller 103 is actuated to rotate along the direction that recording paper S is returned to the upstream of throughput direction, prevents the further downstream transport of recording paper S thus.Crooked among the recording paper S proofreaied and correct in this operation that is called as alignment procedures, thereby the leading edge of recording paper S is even.In some cases, carry out alignment procedures by the rotation that suspends conveying roller 103.

After finishing alignment procedures, it is forward rotation that driven roller 105 is actuated to along the direction of recording paper S downstream transport is rotated.Therefore, driven roller 105 and driven voller 106 clamping recording paper S, and the beginning feeding recordable paper open S, shown in Fig. 1 (b).S further carries along with recording paper, and the trailing edge of recording paper S separates with conveying roller 103, thereby has only distributing roller 104 to open S at feeding recordable paper, shown in Fig. 1 (c).The same with conveying roller 103, distributing roller 104 comprises driven roller 108 and driven voller 109.But, since on recording paper S after the document image distributing roller 104 feeding recordable papers open S, so between distributing roller 104, applied littler amount of pressure to avoid making image deterioration.

U.S. Patent No. 5,640,901 have disclosed a kind of nip roll device, and this nip roll device makes driven voller press the direction of driven roller and the radial centre lines skew of the contact point of process between driven voller and driven roller.Compression aspect is offset and the cooresponding angle of angle of obliquity in a plurality of engaging gears, and these gears pass to driven voller from driven roller with propulsive effort.Even along angle of obliquity direction generation rotary load the time, this structure also can prevent the variation of the clamping force between driven roller and driven voller.

Summary of the invention

Shown in Fig. 2 (a)-2 (c), above-mentioned traditional images recording device comprises driven voller 106 and disc spring 107, this driven voller 106 is supported according to the mode that can move along the perpendicular line of process between the axis of driven voller 106 and driven roller 105, and this disc spring 107 is used for along this sense of motion pushing driven voller 106.Fig. 2 (a)-2 (c) is the enlarged drawing of conveying roller 103.Shown in Fig. 2 (a), when carrying out alignment procedures, recording paper S is limited in the upstream along defeated paper direction of the contact point between conveying roller 103, and the surface of two rollers of the leading edge of recording paper S contact.After carrying out the alignment procedures specified time, driven roller 105 is switched to forward rotation from backward rotation, be used for recording paper S is carried to the downstream of throughput direction.At this moment, the rotation of driven roller 105 temporarily suspends, shown in Fig. 2 (b).Subsequently, driven roller 105 beginning forward rotation, and the turning effort of driven roller 105 passes to recording paper S.Here, driven voller 106 overcomes the thickness h of disc spring 107 withdrawal recording paper S, thereby recording paper S is clamped between the conveying roller 103.

But in the moment of recording paper S between conveying roller 103, the leading edge of 107 couples of recording paper S of disc spring applies spring force F1, shown in Fig. 2 (c).Simultaneously, recording paper S applies antagonistic force F2 along the direction opposite with spring force F1 to the surface of driven voller 106.Shown in Fig. 2 (c), this antagonistic force F2 is applied on the surface of driven voller 106 at the contact point Q place that is positioned at cramping point P upstream along throughput direction.Therefore spring force F1 and antagonistic force F2 produce and are used to make driven voller 106 counter-rotational turning effort F3 (component of antagonistic force F2).Spring force F1 is set at relatively large power, in feeding recordable paper is opened, to avoid slip or other problem.Because turning effort F3 is used for making driven voller 106 along the direction that is used for recording paper S is returned to the upstream of throughput direction (Fig. 2 (c) cw) rotation, so this power has weakened the turning effort that recording paper S is moved downstream of being used for of driven roller 105.Therefore, driven roller 105 slides on recording paper S, and recording paper S to the motion in the downstream of throughput direction less than desired amount, perhaps inhomogeneous between recording paper S.In addition, if only recording paper S occur in the part of Width slide, then recording paper S may be crooked.Therefore, the turning effort F3 that acts on along clockwise direction on the driven voller 106 between the moment between the conveying roller 103 at recording paper S not only hinders recording paper S approaching towards cramping point, but also may be irregular, and can in recording paper S, produce crooked in the moment generation of recording paper S arrival cramping point.When recording process begins, operating so that when the leading edge of the image-recording region on the recording paper S and image recording position alignment, this problem also can cause the variation of the advance amount of the leading edge of distributing to every recording paper S.

In view of top situation, the object of the present invention is to provide sheet material conveyor and image recording structure, they can be when course of conveying begins the leading edge of the medium of clamping recording paper or other conveying reliably, and can prevent from the medium of carrying, to produce variation crooked and that prevent the advance amount of on the leading edge of the medium of every conveying, being distributed.

In order to realize above and other purpose, the invention provides a kind of sheet material conveyor.This sheet material conveyor comprises a pair of conveying roller, support unit and pushing unit.That comprises driven roller and driven voller to conveying roller, and this driven roller is actuated to rotate around first axle, this driven voller pressure contact driven roller, and the rotation of following driven roller is around second rotational.When driven roller along first hand of rotation rotate and driven voller when second hand of rotation opposite with first hand of rotation rotates, these conveying rollers are along sheet material throughput direction conveying recording medium.Driven roller and driven voller define nip line between them.The leading edge of recording medium is provided with first bight and second bight, and when driven roller and driven voller provided this nip line, this first bight can contact at the contact wire place with driven roller, and this second bight can contact at the contact wire place with driven voller.The support unit supports driven voller, and can make driven voller in the withdrawal plane, leave the nip line withdrawal.This withdrawal plane comprises second axis.On the withdrawal plane with comprise predetermined angle α 1 between the imaginary plane of first and second axis and the angle [alpha] 2 bigger than angle [alpha] 1.Support unit allows driven voller to be retracted in the downstream of sheet material throughput direction with respect to this imaginary plane.Pushing driven voller in pushing unit is to provide nip line.Angle [alpha] 1 is than at this imaginary plane with to comprise the angle beta that limits between the sagittal plane of second axis and contact wire big.

The anticipated orientation on withdrawal plane is the direction of the straight line L1 shown in Figure 13.

According to another aspect, the invention provides a kind of image recording structure.This image recording structure comprises sheet material conveyor and image recording unit.This sheet material conveyor comprises a pair of conveying roller, support unit and pushing unit.That comprises driven roller and driven voller to conveying roller, and this driven roller is actuated to rotate around first axle, this driven voller pressure contact driven roller, and the rotation of following driven roller is around second rotational.When driven roller along first hand of rotation rotate and driven voller when second hand of rotation opposite with first hand of rotation rotates, these conveying rollers are along sheet material throughput direction conveying recording medium.Driven roller and driven voller define nip line between them.The leading edge of recording medium is provided with first bight and second bight, and when driven roller and driven voller provided this nip line, this first bight can contact at the contact wire place with driven roller, and this second bight can contact at the contact wire place with driven voller.The support unit supports driven voller, and can make driven voller in the withdrawal plane, leave the nip line withdrawal.This withdrawal plane comprises second axis.On the withdrawal plane with comprise predetermined angle α 1 between the imaginary plane of first and second axis and the angle [alpha] 2 bigger than angle [alpha] 1.Support unit allows driven voller to be retracted in the downstream of sheet material throughput direction with respect to this imaginary plane.Pushing driven voller in pushing unit is to provide nip line.Angle [alpha] 1 is than at this imaginary plane with to comprise the angle beta that limits between the sagittal plane of second axis and contact wire big.Image recording unit is document image on the sheet pumped (conveying) medium of being carried by sheet material conveyor.

Description of drawings

With reference to the following drawings illustrative aspects according to the present invention is elaborated, wherein:

Fig. 1 is an instruction diagram, and traditional recording paper conveying mechanism is shown;

Fig. 2 is an enlarged drawing, and traditional recording paper conveying mechanism is shown;

Fig. 3 is the external perspective view according to the multi-function device of first embodiment of the invention;

Fig. 4 is a vertical sectional view, and the inner structure of multi-function device is shown;

Fig. 5 is an amplification view, is illustrated in the keystone configuration of the printer section in the multi-function device;

Fig. 6 is the planar view of printer section;

Fig. 7 is a transparent view, is illustrated in image recording unit structure on every side;

Fig. 8 is a block scheme, is illustrated in the structure of the controller in the multi-function device;

Fig. 9 is the transparent view that is supported on the niproll retainer on the retainer load-carrying element;

Figure 10 is the exploded drawings of retainer load-carrying element and niproll retainer;

Figure 11 is a transparent view, and the structure of roller bearing is shown;

Figure 12 is an enlarged drawing, and the range of movement of niproll retainer is shown;

Figure 13 is the cutaway view of the conveying roller in multi-function device, and the position relation of driven roller and niproll is shown;

Figure 14 is the cutaway view of the conveying roller in multi-function device, and the position relation of driven roller and niproll is shown;

Figure 15 is the cutaway view of the conveying roller in multi-function device, and the position relation of driven roller and niproll is shown;

Figure 16 is a cutaway view, and the niproll retainer that is in the retracted position is shown;

Figure 17 is a cutaway view, and the niproll retainer that is in the transfer position is shown;

Figure 18 is an instruction diagram, is illustrated in the position relation based on driven roller in the XY system of axes of initial point O and driven voller; And

Figure 19 is an instruction diagram, and the recording paper that is clipped by conveying roller is shown.

The specific embodiment

Will be in reference to these accompanying drawings according to certain aspects of the invention sheet material conveyor be described, wherein same partial sum parts are represented to avoid repeat specification by identical Reference numeral.

Fig. 3 is a transparent view, and the outward appearance of multi-function device is shown.Suppose that multi-function device 1 is arranged in the orientation that intention as shown in Figure 3 uses, term " makes progress ", " downwards ", " right side ", " left side ", " preceding ", " back " etc. will be used in whole specification sheets.Fig. 4 is a vertical sectional view, and the inner structure of multi-function device 1 is shown.Multi-function device 1 is provided with integratedly and is arranged in the printer section 2 that is made of ink-jet recording apparatus of bottom and the scanner part 3 that is arranged in top, and has printer function, scanner functions, duplicator function and facsimile function.Optionally, except printer function, can from this multi-function device 1, omit all functions.For example, can this multi-function device 1 be constituted independent printer by omitting scanner part 3.

The printer section 2 of multi-function device 1 mainly is connected on computing machine or other extraneous information device, is used for the print data that comprises text or view data recording text and image on recording paper of sending out according to from computing machine.This multi-function device 1 can also be connected to digital camera, and can with from the Imagery Data Recording of digital camera input on recording paper.In addition, multi-function device 1 can be mounted with storage card or other storage medium, and can will be stored in Imagery Data Recording on the storage medium on recording paper.

As shown in Figure 3, multi-function device 1 roughly is configured as thin cuboid, and its width and depth dimensions are greater than height dimension.Be arranged on the opening 2a in the front surface that printer section 2 in the bottom of multi-function device 1 has printer section of being formed on 2.21 fens two-layer stacked vertical of sheet feed stacker 20 and discharge dish are in opening 2a.Sheet feed stacker 20 can be held for example A4 specification and comprise the B5 specification and the recording paper of postcard specification of all size.Sheet feed stacker 20 comprises slidably coils 20a, can outwards pull out this as shown in Figure 4 in case of necessity and slidably coil 20a, to expand the face area of this dish.Adopt this structure, sheet feed stacker 20 can be held for example recording paper of legal documents specification.Be contained in recording paper in the sheet feed stacker 20 and be supplied in the printer section 2 carrying out desired image capture process, and be discharged to subsequently on the discharge dish 21.

The scanner part 3 that is arranged in the top of multi-function device 1 is flat bed scanner.Shown in Fig. 3 and 4, multi-function device 1 comprises: the original copy that can the open and close lid 30 that is positioned at its top; And be arranged on pressuring plate glass 31 and the imageing sensor 32 that original copy covers 30 belows.Pressuring plate glass 31 supports master copy file when being used for image on positive scan manuscript file.Imageing sensor 32 is arranged on pressuring plate glass 31 belows, and can be along Width (left and right directions) crank motion of multi-function device 1, and wherein the sub scanning direction of imageing sensor 32 is the fore-and-aft direction of multi-function device 1.

Control panel 4 is arranged on the top front surface of multi-function device 1, is used for printer operation part 2 and scanner part 3.Control panel 4 is made of various action buttons and Liquid Crystal Display (LCD).Multi-function device 1 is according to the operating order operation by control panel 4 inputs, and the instruction manipulation that sends by printer driver or scanner drive according to computing machine when being connected to outer computer.As shown in Figure 3, socket portion 5 is set on its front surface in the left part on multi-function device 1, in this socket portion 5, can inserts various mini memory cards or other storage medium.The user can instruct by control panel 4 input operations, reading on view data that is stored on the storage card that is inserted in the socket portion 5 and the Liquid Crystal Display (LCD) that view data is presented at control panel 4, but also can on recording paper, write down desired image to use printer section 2 by input instruction.

Next describe with reference to the inner structure of Fig. 3-7 pair multi-function device 1 especially structure of printer section 2.As shown in Figure 4, be provided with inclination separating plate 22 near the rear side of the sheet feed stacker 20 in the bottom that is arranged at multi-function device 1, be used for making the recording paper that is layered in the sheet feed stacker 20 to separate and the upwards guiding of paper that separates.Defeated paper path 23 is from upwards guiding of inclination separating plate 22, towards the front curvature of multi-function device 1, and extends from inclination separating plate 22 along fore-and-aft direction.Image recording unit 24 is passed through in defeated paper path 23, and leads to discharge dish 21.Therefore, the recording paper that defeated paper path 23 will transport from sheet feed stacker 20 is along the U-shaped route guidance, and this U-shaped path is upwards and back crooked on the opposite sense of image recording unit 24.Image recording unit 24 had write down image on paper after, paper moved on along defeated paper path 23 and is discharged on the discharge dish 21.

Fig. 5 is an amplification view, and the keystone configuration of printer section 2 is shown.As shown in Figure 5, paper feed roller 25 is arranged on sheet feed stacker 20 tops, and the recording paper that is used for being layered in the sheet feed stacker 20 supplies to defeated paper path 23.Paper feed roller 25 is supported on the end of sheet supplying arm 26.Line feed motor 71 (referring to Fig. 8) drive force paper feed roller 25 rotations that pass to paper feed roller 25 by means of drive transmission device 27.Drive transmission device 27 comprises a plurality of engaging gears.

Sheet supplying arm 26 is supported on the cardinal extremity 26a rotationally.When sheet supplying arm 26 pivoted around cardinal extremity 26a, paper feed roller 25 perpendicular movements were so that with sheet feed stacker 20 contact with separate.As shown in Figure 5, sheet supplying arm 26 is urged to be rotated downward to be with sheet feed stacker 20 under himself weight or action of the spring and contacts, and upwards withdrawal when inserting or removing sheet feed stacker 20.When sheet supplying arm 26 pivoted downwards, the paper feed roller 25 that is supported on the end of sheet supplying arm 26 contacted with recording paper pressure in sheet feed stacker 20.When paper feed roller 25 rotated in this position, the friction force that produces between the surface of paper feed roller 25 and recording paper was carried uppermost recording paper towards inclination separating plate 22.The leading edge of this recording paper contacts inclination separating plate 22, and upwards is directed on the defeated paper path 23 by inclination separating plate 22.In some cases, when paper feed roller 25 is being carried topmost recording paper, the top paper and below paper between friction or the paper of static below making be transferred with uppermost paper.But following paper is prevented from when contact inclination separating plate 22.

Except the part that is provided with image recording unit 24, defeated paper path 23 is made of outer guide surface and interior guide surface, and outer guide surface and interior guide surface are opposite each other and be formed with predetermined gap between them.For example, by outer guiding elements 18 and interior guiding elements 19 are fixed on the framework of multi-function device 1, thereby the sweep 17 of failing paper path 23 can be configured near the rear side of multi-function device 1.Roller 16 is provided with along defeated paper path 23, and especially is arranged in this sweep in defeated paper path 23.These rollers 16 are arranged on rotationally on the axis of the Width extension in defeated paper path 23.The surface of roller 16 exposes from outer guide surface.These rollers 16 help recording paper smooth transportation in the sweep in defeated paper path 23.

Shown in Figure 4 and 5, image recording unit 24 is arranged on the defeated paper path 23.Image recording unit 24 comprises along the reciprocating balladeur train 38 of the main scanning direction parallel with left and right directions and is installed in ink jet print head 39 in the balladeur train 38.Give ink jet print head 39 by ink barrel 41 (referring to Fig. 6) with the ink feed of cyan (C), magenta (M), yellow (Y) and black (BK) with the print cartridge that ink jet print head 39 is arranged in the multi-function device 1 independently.In the 38 reciprocating whiles of balladeur train, little ink droplet of the ink of these colors selectively is ejected on the recording paper that platen 42 is carried, with document image on paper from ink jet print head 39.It is to be noted, print cartridge is not shown in Fig. 5 and 6.

Fig. 6 is a planar view, and the keystone configuration of printer section 2 is shown, and mainly illustrates from the approximate center of printer section 2 to the structure of face side thereafter.Fig. 7 is a transparent view, is illustrated in the structure of the image recording unit 24 in the printer section 2.Shown in Fig. 6 and 7, pair of

guide rails

43 and 44 is arranged on defeated 23 tops, paper path.These

guide rails

43 and 44 are arranged to along defeated paper direction (fore-and-aft direction) the each interval predetermined distance in defeated paper path 23, and extend along the Width (left and right directions) with the upper vertical of defeated paper

direction.Guide rail

43 and 44 is arranged on the enclosure interior of printer section 2, and constitutes the part of the frame support member of printer section 2.Balladeur train 38 is according to being arranged on two

guide rails

43 and 44 along the mode that the direction vertical with defeated paper direction slided.Therefore, these

guide rails

43 and 44 modes according to approximate horizontal are provided with, and on defeated paper direction and put, reduce the height of printer section 2 thus and realize thinner device.

The guide rail 43 on the upstream side of defeated paper direction that is arranged on guide rail 44 is plate shapes, and it is along the size of the Width (left and right directions) in the defeated paper path 23 crank motion scope greater than balladeur train 38.The guide rail 44 that is arranged on the downstream also is a plate shape, and its size along the Width in defeated paper path 23 is roughly the same with the size along the Width of failing paper path 23 of guide rail 43.Balladeur train 38 can slide along the longitudinal direction of

guide rail

43 and 44, and the upstream extremity of balladeur train 38 is supported on the guide rail 43, and downstream end is supported on the guide rail 44.Guide rail 44 has from the upstream side of guide rail 44 marginal portion 45 with the approximate right angle K/UP.The balladeur train 38 that is supported on

guide rail

43 and 44 has pair of rolls or other clamping components that is used for clipping slidably marginal portion 45.Therefore, balladeur train 38 can slide along the direction vertical with defeated paper direction in defeated paper direction location.In other words, balladeur train 38 is supported on

guide rail

43 and 44 slidably, and can be used as under the situation of locating benchmark along the direction crank motion vertical with defeated paper direction in the marginal portion 45 of guide rail 44.Though not shown in these accompanying drawings, with lubricant for example grease be coated on the marginal portion 45 so that the slip of balladeur train 38.

On the end face of guide rail 44, be provided with leather belt driving mechanism 46.This leather belt driving mechanism 46 is made of drive pulley 47 and driven pulley 48 and annular synchronous belt 49, drive pulley 47 and driven pulley 48 are arranged near the Width end in defeated paper path 23, annular synchronous belt 49 stretches round drive pulley 47 and driven pulley 48, and has tooth on the side surface within it.Balladeur train motor 73 (referring to Fig. 8) produces propulsive effort, and this propulsive effort passes to the axle of drive pulley 47, is used to make drive pulley 47 to rotate.The rotation of drive pulley 47 makes synchronous belt 49 motion of detouring.Though synchronous belt 49 is an endless-belt, also can use belt on the balladeur train 38 by two ends are fixed to end in multi-function device 1.

The bottom surface of balladeur train 38 is fixed on the synchronous belt 49, thereby the motion of detouring of synchronous belt 49 makes balladeur train 38 crank motion on

guide rail

43 and 44, and the position of balladeur train 38 with respect to defeated paper direction kept in marginal portion 45 simultaneously.Ink jet print head 39 is installed in the balladeur train 38 with this structure, thereby ink jet print head 39 is also along the Width crank motion.Here, Width is a main scanning direction.

As shown in Figure 6, the coding that is used for linear encoder 77 (referring to Fig. 8) is with 50 along guide rail 44 settings.Coding is the ribbon-shaped members that is formed by transparent resin with 50.A pair of

support section

33 and 34 is formed on the end face of guide rail 44, and on each Width end of guide rail 44 (along each end of the vibration-direction of balladeur train 38) support section is set.Coding is with 50 to extend on marginal portion 45, and coding with 50 engaged at end in support section 33 and 34.Though not shown in these accompanying drawings, in the

support section

33 and 34 one has and is used for and the sheet spring of coding with 50 engaged at end.This sheet spring is by applying tension force prevent to encode lax with in 50 to coding with 50 in a longitudinal direction, simultaneously elastically deformable make when being with 50 to apply external force that coding is with to coding 50 can be crooked.

The part that is in the light that allows the light transmission part that light passes through and stop that light passes through is arranged alternately with 50 the length spacing with regulation along coding.The optical pickocff 35 that is made of transmission sensor is arranged on the end face of balladeur train 38 with coding is with 50 opposed positions.Optical pickocff 35 with balladeur train 38 along coding with 50 length crank motion, and detect and be formed on coding with the pattern on 50.In ink jet print head 39, be provided with the control circuit of ink-ejecting head plate and be used to control ink-jet.This control circuit of ink-ejecting head buttress is according to the detection signal output pulse signal from optical pickocff 35.By determining the position of balladeur train 38 according to this impulse singla, thereby can control the crank motion of balladeur train 38.The control circuit of ink-ejecting head plate is covered by the ink-jet skull of balladeur train 38, and therefore can't see in Fig. 6 and 7.

As shown in Fig. 5-7, platen 42 be arranged on defeated paper path 23 with ink jet print head 39 opposed bottoms on.This platen 42 is across the middle body in the crank motion scope that recording paper passes through of allowing at balladeur train 38.The width of platen 42 is fully greater than the maximum width of the recording paper that can carry in multi-function device 1, thereby two widthwise edges of recording paper are passed through on platen 42.Platen 42 is arranged so that stayed surface 42a (referring to Figure 13) is parallel with the installation surface of multi-function device 1.

As shown in Figure 6, the maintenance unit that comprises wiper mechanism 51 and useless disc 84 is arranged in the zone that recording paper do not pass through, and promptly is arranged in the zone in the image recording scope outside of ink jet print head 39.Nozzle 53 (not shown) that wiper mechanism 51 is used for from ink jet print head 39 (Fig. 7) are extracted bubble and impurity out.Wiper mechanism 51 comprises: the block 52 that is used to cover these nozzles 53; By the 52 pump machanism (not shown) that are connected on the ink jet print head 39 of blocking a shot; Be used to make block 52 motions with nozzle 53 contacts of ink jet print head 39 or the kinematic mechanism (not shown) that separates.In Fig. 6 and 7, pump machanism and kinematic mechanism are arranged on guide rail 44 belows, and therefore can not see.Operating with when ink jet print head 39 is removed bubbles, balladeur train 38 motions, thus ink jet print head 39 is arranged on block 52 tops.Subsequently, kinematic mechanism makes block 52 with respect to ink jet print head 39 upward movements, so that form sealing on the nozzle 53 in the bottom surface that is formed at ink jet print head 39.Pump machanism produces negative pressure then in block 52, from nozzle 53 bubble and the impurity that comprise ink and the ink are extracted out.

Useless disc 84 is arranged on the image recording scope outside on the end face of platen 42, but is arranged in the crank motion scope of balladeur train 38, is used for receiving the ink of having gone out from ink jet print head 39.The inside of useless disc 84 is lined with felt pan, is used for the ink that absorbs and keep going out.Have this structure maintenance unit and can carry out following maintenance, for example remove the mixed ink of bubble and different colours, and prevent that ink jet print head 39 from becoming dry from ink jet print head 39.

As shown in Figure 3, be provided with door 7 on the front surface of printer section 2 housings, this door 7 can open and close on this front surface.Door 7 opened make the print cartridge mounting portion be exposed on the front side of printer section 2, remove print cartridge thereby make the user print cartridge can be installed in the print cartridge mounting portion or from the print cartridge mounting portion.Though not shown in these accompanying drawings, the print cartridge mounting portion is separated into four accommodating chamber, is used for holding separately the print cartridge that is filled with cyan, magenta, yellow and black ink.As shown in Figure 6, lead to balladeur train 38 with four kinds of cooresponding four ink barrels 41 of ink color from the print cartridge holding portion.The print cartridge of ink from be installed in the print cartridge holding portion is supplied to the ink jet print head 39 that is installed on the balladeur train 38 by ink barrel 41.

Ink barrel 41 is the pipe that is formed by synthetic resin, and is flexible so that can bending when balladeur train 38 crank motions.As shown in Figure 6, the Width of ink barrel 41 from the print cartridge holding portion along this device extend to be positioned at this device central authorities near the position, at these position ink barrel 41 fix in position on the geometrical clamp on the device body 36.38 part forms the U-shaped curve to ink barrel 41 from geometrical clamp 36 to balladeur train, and this part is not fixed in apparatus body.This its shape of U-shaped part changes along with balladeur train 38 crank motions.What ink barrel 41 was not shown in Fig. 6 extends to the part of balladeur train mounting portion from geometrical clamp 36.

Specifically, the part between geometrical clamp 36 and balladeur train 38 of ink barrel 41 guides in one direction along the crank motion path of balladeur train 38, and reverse subsequently, thereby forms sweep.In other words, this part of ink barrel 41 is roughly U-shaped in planar view.At balladeur train 38 places, four ink barrels 41 are along defeated paper direction level and put, and extend along the vibration-direction of balladeur train 38.But four ink barrels 41 are arranged vertically to sentence at geometrical clamp 36 to be convenient to fix.Geometrical clamp 36 has the U-shaped cross-section in the top upper shed.The ink barrel 51 of stacked vertical inserts and passes this opening, and the folder 36 that is fixed keeps integratedly.Like this, four ink barrels 41 are reversed into vertical juxtaposition relationship from horizontal juxtaposition relationship simultaneously along 36 the U-shaped path bending from balladeur train 38 to geometrical clamp.

Four ink barrels 41 have roughly the same from balladeur train 38 to geometrical clamp 36 length.Be arranged at balladeur train 38 places along the ink barrel 41 of the upstream of defeated paper direction and be arranged on the top at geometrical clamp 36 places.The ink barrel 41 that then is provided with according to the order that begins from upstream side at balladeur train 38 places then is vertically set on geometrical clamp 36 in order.Repeat this process, thus the ink barrel of arranging to the downstream along defeated paper direction from upstream side at balladeur train 38 places 41 at geometrical clamp 36 according to being disposed in order from the top to the bottom.Because length is roughly suitable, so these ink barrels 41 bend to feasible: along the juxtaposed order of defeated paper direction, the central authorities of the sweep of every ink barrel 41 setover along defeated paper direction according to ink barrel 41.Therefore, four ink barrels 41 have the layout of vertical bank in sweep, make thus when ink barrel 41 changes shapes interference between the ink barrel 41 when following the crank motion of balladeur train 38 to minimize.In this multi-function device 1, be provided with four ink barrels 41.But even under the situation that the quantity of ink barrel 41 increases, ink barrel 41 also can arrange according to identical juxtaposition relationship, wherein is arranged at balladeur train 38 places along the ink barrel 41 of the upstream end of defeated paper direction to be positioned at the top at geometrical clamp 36 places.

Flat cable 85 is transferred to control circuit of ink-ejecting head plate the ink jet print head 39 from the main circuit board that constitutes controller 64 (referring to Fig. 8) with recording signal.Though not shown in Fig. 6, main circuit board is arranged near the front portion of printer section 2.Flat cable 85 is the insulation ribbon cable, and it is made of the conductor that is used to transmit electric signal, and these conductors scribble for example mylar of film of synthetic resin.Flat cable 85 makes main circuit board be electrically connected to the control circuit of ink-ejecting head plate.

Flat cable 85 is flexible, and the bending in response to the crank motion of balladeur train 38.As shown in Figure 6, flat cable 85 extends from balladeur train 38 in one direction along the crank motion path of balladeur train 38, subsequently oppositely and extend to geometrical clamp 86, forms sweep thus.In other words, flat cable 85 is followed the path that is roughly U-shaped in planar view, and the end face of band shape and bottom surface are vertical orientated.In other words, the end face of flat cable 85 and bottom surface fall within the vertical plane surface, simultaneously these normal to a surface horizontal alignments.In addition, flat cable 85 is identical with the vibration-direction of balladeur train 38 from the bearing of trend of balladeur train 38 extended directions and ink barrel 41.

The end that is fixed on the balladeur train 38 of flat cable 85 is electrically connected on the control circuit of ink-ejecting head plate that is installed in the balladeur train 38.Another end on the geometrical clamp 86 of being fixed to of flat cable 85 is extended and is electrically connected to main circuit board.Similar with ink barrel 41, the part of the one-tenth U-shaped bending of flat cable 85 is not fixed on any member, but changes shape along with balladeur train 38 crank motions.Rotational support member 90 is set is used to support ink barrel 41 and flat cable 85, because these parts change shape when balladeur train 38 crank motions.Rotational support member 100 supports ink barrel 41 and flat cable 85.

On the front surface that extends along Width (left and right directions) of printer section 2, be provided with limiting wall 37.Limiting wall 37 has vertical surface, and this vertical surface is contacted by ink barrel 41, and along the straight-line extension of the vibration-direction of following balladeur train 38.Limiting wall 37 is arranged on and makes ink barrel 41 from geometrical clamp 36 extended zones, and is set at the height that is enough to allow vertically juxtaposed all four ink barrels 41 contact.Ink barrel 41 37 extends from geometrical clamp 36 along limiting wall.

By the inner surface of contact limiting wall 37, limit ink water pipe 41 stretches on the direction of promptly leaving balladeur train 38 towards the direction of the front surface of printer section 2.The part from geometrical clamp 36 to sweep of ink barrel 41 is maintained in vertical juxtaposition relationship at geometrical clamp 36, and ink barrel 41 is contacting limiting wall 37.Therefore, make these ink barrels 41 in the U-shaped sweep, be maintained in desired being in tilted layout reliably.

Geometrical clamp 36 is arranged near the Width central authorities of printer section 2.Geometrical clamp 36 is ink barrel 41 fixedly, thereby ink barrel 41 extends towards limiting wall 37.More particularly, the vertical surface of limiting wall 37 and ink barrel 41 is formed than 180 from geometrical clamp 36 extended directions spend little obtuse angle planar view.Ink barrel 41 is flexible, but has rigidity (flexural rigidity) to a certain degree.Therefore, ink barrel 41 is being pressed against on the surface of limiting wall 37 when geometrical clamp 36 extends to limiting wall 37 with this angle.Therefore, ink barrel 41 is followed the scope of limiting wall 37 and is expanded in the crank motion scope of balladeur train 38, has reduced the area in the part that stretches towards balladeur train 38 from the sweep of ink barrel 41 to balladeur train 38 thus.

Geometrical clamp 86 is arranged near the width central authorities of printer section 2 than geometrical clamp 36 in-to-in position more.Geometrical clamp 86 is flat cable 85 fixedly, thereby flat cable 85 stretches towards limiting wall 37.Therefore, the vertical surface of limiting wall 37 and flat cable 85 is formed than 180 from geometrical clamp 86 extended directions spend little obtuse angle planar view.Flat cable 85 is flexible, but has rigidity (flexural rigidity) to a certain degree.Therefore, flat cable 85 is being pressed against on the surface of limiting wall 37 when geometrical clamp 86 extends to limiting wall 37 with this angle.Therefore, flat cable 85 is followed the scope of limiting wall 37 and is expanded in the crank motion scope of balladeur train 38, has reduced the area in the part that stretches towards balladeur train 38 from the sweep of flat cable 85 to balladeur train 38 thus.

Shown in Fig. 5 and 7, a pair of conveying roller 89 is arranged on the upstream along throughput direction of image recording unit 24.Conveying roller 89 comprises driven roller 87 and niproll 88, and this niproll 88 is from the base pressure contact driven roller 87 of driven roller 87.Conveying roller 89 makes the recording paper aligning of carrying and being inserted into along defeated paper path 23 in the cramping point between driven roller 87 and niproll 88.Conveying roller 89 is the clamping recording paper also, and after carrying out alignment procedures specified time section on platen 42 conveyance of sheets.

Niproll 88 is supported in the niproll retainer 96 rotationally, and the thrust pressure with regulation contacts driven roller 87 simultaneously.Niproll retainer 96 rolls and is supported on the retainer load-carrying element 97 (Fig. 5), so that can roll along defeated paper direction.Retainer load-carrying element 97 is provided with inner frame 95 (referring to Fig. 5) integratedly, and this inner frame 95 forms the housing of multi-function device 1.Begin feeding recordable paper when opening in this supporting construction of conveying roller 89 usefulness, niproll retainer 96 rolls to the downstream of defeated paper direction and is offset to the transfer position shown in Figure 17, and maintains when feeding recordable paper is opened in this position.When the trailing edge of recording paper left conveying roller 89, niproll retainer 96 rolled to the upstream of defeated paper direction immediately and is offset to retracted position.The supporting construction that the structure of retainer load-carrying element 97 and niproll retainer 96 and being used to supports retainer load-carrying element 97 and niproll retainer 96 will be described in more detail hereinafter.

As shown in Figure 5, a pair of distributing roller 92 is arranged on the downstream along defeated paper direction of image recording unit 24.Distributing roller 92 comprises driven roller 90 and is arranged on the band discaling roll 91 of driven roller 90 tops.After recording operation, driven roller 90 and band discaling roll 91 are delivered to discharge dish 21 with the recording paper clamping.Because driven roller 90 and band discaling roll 91 are pressed against on the recording paper of having printed, thus the surface imperfection formation of band discaling roll 91, so that do not make the image deterioration that is recorded on the paper.Band discaling roll 91 movably is provided with, and can slide on driven roller 90 and the direction of leaving driven roller 90.Disc spring (not shown) pushing band discaling roll 91 is with pressure contact driven roller 90.When the approaching clamp-press part timesharing between driven roller 90 and band discaling roll 91 of recording paper, the thrust pressure that band discaling roll 91 overcomes spring retreats and the cooresponding distance of recording paper thickness, thereby recording paper and is pressed against on the driven roller 90 between driven roller 90 and band discaling roll 91.Therefore, the turning effort of driven roller 90 passes to recording paper reliably.

Driven roller 87 and driven roller 90 are transmitted next drive force to rotate from line feed motor 71 (referring to Fig. 8).Line feed motor 71 is connected on the axial end portion of driven roller 87.When the approaching clamp-press part timesharing between driven roller 87 and niproll 88 of a recording paper that supplies from sheet feed stacker 20, drive driven roller 87 backward rotation so that recording paper is returned to the upstream of defeated paper direction, and niproll 88 is followed the rotation of driven roller 87.This backward rotation is used for making the leading edge of the recording paper that has arrived cramping part to aim at, so that proofread and correct crooked in the paper.By driven roller 87 being suspended rather than making driven roller 87 backward rotation also can realize this alignment procedures.

After carrying out the alignment procedures specified time, drive driven roller 87 forward rotation so that with the recording paper downstream transport.Therefore, recording paper driven rolls 87 and niproll 88 clampings and downstream transport.The rotational synchronization of driven roller 87 and driven roller 90.In addition, on driven roller 87, be provided with rotary encoder 76 (referring to Fig. 8).This rotary encoder 76 has optical pickocff 94, and this optical pickocff 94 is used to detect the pattern on the coding disk 93 (referring to Fig. 7) that rotates with driven roller 87.Controller 64 (referring to Fig. 8) basis is from the detection signal controlling and driving roller 87 of rotary encoder 76 and the rotation of driven roller 90.Line feed width with regulation drives driven roller 87 off and on.Therefore, carry off and on by recording paper line feed width with this regulation on platen 42 of driven roller 87 and niproll 88 clampings.Ink jet print head 39 scans after each line feed, and from the front edge side opening entry image of recording paper.On recording paper after the document image, the front edge side of driven roller 90 and band discaling roll 91 clamping recording papers.Therefore, with the regulation the line feed width off and on feeding recordable paper open, and the front edge side of paper is clamped between driven roller 90 and the band discaling roll 91, and the trailing edge side is clamped between driven roller 87 and the niproll 88, simultaneously ink jet print head 39 document image after each line feed.Along with further feeding recordable paper is opened, the trailing edge of paper separates with driven roller 87 and niproll 88, thereby conveying roller 89 no longer clips paper.At this moment, recording paper is carried with the line feed width of this regulation off and at a driven rolls 90 with when being with discaling roll 91 to clip, and ink jet print head 39 is continuing document image after each line feed.After in regulation zone, having finished image, drive driven roller 90 continuous rotation, and a paper that is clipped by driven roller 90 and band discaling roll 91 is discharged on the discharge dish 21 at recording paper.

Fig. 8 is a block scheme, is illustrated in the structure of the controller 64 in the multi-function device 1.Controller 64 is controlled the whole operations that not only comprise scanner part 3 but also comprise the multi-function device 1 of printer section 2.Controller 64 is made of the main circuit board that is connected on the flat cable 85.Because the structure of scanner part 3 is inessential in the present invention, so omitted the detailed description of this structure.As shown in Figure 8, controller 64 is made of microcomputer, and it mainly comprises CPU65 (central processing unit), ROM (read-only memory (ROM)) 66, RAM (random access memory) 67 and EEPROM (electric erazable programmable ROM) 68.These parts are connected on the ASIC (application-specific IC) 70 by bus 69.

ROM66 storage is used to control the program of the various operations of multi-function device 1.RAM67 is with acting on temporary transient storage area or work area of preserving the various data of being used by CPU65 in the process of these programs of execution.EEPROM68 is stored in setting, the sign that must preserve when cutting off the electricity supply.

As shown in Figure 8, according to the order from CPU65, ASIC70 produces the phase excitation signal that is used for conductivity is given line feed motor 71.This signal is put on the driving circuit 72 of line feed motor 71.By by driving circuit 72 with drive signal be fed to the line feed motor 71, thereby ASIC70 can control the line feed motor 71 rotation.

Driving circuit 72 drives line feed motor 71, and line feed motor 71 is connected on paper feed roller 25 and the wiper mechanism 51.When the output signal that receives from ASIC70, driving circuit 72 produces and is used to electric signal that line feed motor 71 is rotated.When line feed motor 71 rotated, the turning effort of line feed motor 71 was by passing to paper feed roller 25, conveying roller 60, distributing roller 62 and wiper mechanism 51 at driver train known in the field, and this driver train comprises gear, axle drive shaft.In other words, except supplying with the recording papers from sheet feed stacker 20, the line feed motor 71 in the multi-function device 1 is used for recording paper is transported to position on the platen 42, and is used for after finishing record recording paper being discharged on the discharge dish 21.

Similarly, when the order that receives from CPU65, ASIC70 produces and is used for to the phase excitation signal of balladeur train motor 73 power supplies etc., and this signal is imposed on the driving circuit 74 of balladeur train motor 73.By by driving circuit 74 drive signal being supplied to balladeur train motor 73, ASIC70 can control the rotation of balladeur train motor 73.

Driving circuit 74 is used for driving balladeur train motor 73.When the output signal that receives from ASIC70, driving circuit 74 produces and is used to electric signal that balladeur train motor 73 is rotated.When balladeur train motor 73 rotated, the turning effort of balladeur train motor 73 passed to balladeur train 38 by leather belt driving mechanism 46, and balladeur train 38 is scanned according to reciprocating mode.Like this, controller 64 can be controlled the crank motion of balladeur train 38.

Driving circuit 75 is set to be used for regularly driving ink jet print head 39 with regulation.ASIC70 produces signal according to the drive controlling program that receives from CPU65, and gives driving circuit 75 with this signal output.Driving circuit 75 drives ink jet print head 39 according to the output signal that receives from ASIC70.Driving circuit 75 is installed in the control circuit of ink-ejecting head plate.When the main circuit board that constitutes controller 64 is transferred to the control circuit of ink-ejecting head plate by flat cable 85 with output signal, driving circuit 75 drive ink jet print heads 39 with predetermined timing selectively with the ink jet of every kind of color to recording paper.

The linear encoder 77 that ASIC70 also is connected to the rotary encoder 76 of the amount of spin that is used to detect conveying roller 60 and is used to detect the position of balladeur train 38.When connecting the power supply of multi-function device 1, balladeur train 38 moves to an end of

guide rail

43 and 44, and the detection position of initialization linear encoder 77.When balladeur train 38 on

guide rail

43 and 44 during from the motion of this initial position, be arranged on optical pickocff 35 on the balladeur train 38 and detect coding, and detect output pulse signal according to these with the pattern on 50.Controller 64 is determined the distance that balladeur train 38 has moved according to impulse singla quantity.According to this examined motion, the rotation of controller 64 control balladeur train motors 73 is so that the crank motion of control balladeur train 38.

ASIC70 is also connected to: scanner part 3; Control panel 4 is used to specify the operation of multi-function device 1; Socket portion 5 can be inserted various mini memory cards in socket portion 5; Parallel interface 78 and USB interface 79 are used for by parallel cable or USB cable and Personal Computer or other external device (ED) swap data; And NCU (network control unit) 80 and modem 81, be used to carry out facsimile function.

Next, with reference to Fig. 9 to Figure 17 the structure of retainer load-carrying element 97 and niproll retainer 96 and the supporting construction of niproll retainer 96 are elaborated.Figure 12-15 is the cutaway view along the plane vertical with the pivot center of driven roller 87.In the following description, be arranged on this plane at point shown in Figure 12-15 (O, A, B, B1, B2, G1, G2) and straight line (L1, L2).In addition, for convenience of description, the thickness h of the recording paper S among Figure 13 to 15 is amplified.

Niproll retainer 96 has elongated shape as shown in Figures 9 and 10, and along the Width longitudinal extension of recording paper.As shown in figure 10, four rollers hold that compartment 98 and eight springs hold that compartment 99 is arranged on niproll retainer 96 with driven roller 87 opposed end faces on.These rollers hold longitudinal direction the interval formation to stipulate of compartment 98 along niproll retainer 96.On the bottom surface of niproll retainer 96, be formed with four prodgers 135.

Niproll 88 is contained in spring to be held in the compartment 99, and has the turning cylinder of aiming at the longitudinal direction of niproll retainer 96 130.Spring holds compartment 99 and is adjacent to be formed on these two ends with two ends that roller holds compartment 98.Disc spring 131 is contained in spring under compressive state holds in the compartment 99.This structure is an example, and what still it should be obvious that is that the quantity and the accommodating method of niproll 88 and disc spring 131 can appropriate changes.

Spring holds compartment 99 and is limited by the separator of battery plates 132 that is erected on two vertical sides that spring holds compartment 99.In every separator of battery plates 132, be formed with bearing 133, be used for supporting the turning cylinder 130 of respective clamp roller 88.Bearing 133 forms long vertical trench in opposed separator of battery plates 132.The upper end that constitutes the groove of bearing 133 forms slightly littler than the diameter of turning cylinder 130.When being pressed into turning cylinder 130 in the bearing 133, the upper end elasticity of groove is widened to allow turning cylinder 130 to insert.After turning cylinder 130 inserted fully, the upper end of groove returned to their original-shape, thereby turning cylinder 130 can not be easy to break away from bearing 133.Like this, turning cylinder 130 is supported in the bearing 133, simultaneously can be in these grooves perpendicular movement.By extending, niproll 88 is according to being supported along the mode of the depth direction perpendicular movement of bearing 133.

Spring holds compartment 99 and forms along the recessed recessed portion of the depth direction that is formed on the bearing 133 in the separator of battery plates 132.Disc spring 131 is housed in spring to be held in the compartment 99, and the turning cylinder 130 of niproll 88 is inserted in the bearing 133, thereby compresses this disc spring 131.Therefore, the elastic force of disc spring 131 by compression upwards pushes niproll 88, in other words, will be applied on the niproll 88 towards the thrust pressure of driven roller 87.Therefore, niproll 88 is supported in the bearing 133 rotationally, and is pushed towards driven roller 87 by disc spring 131.When the recording paper with specific thickness was transported to driven roller 87 and niproll 88, the thrust pressure that paper overcomes disc spring 131 promoted niproll 88 and the cooresponding distance of paper sheet thickness downwards.

As mentioned above, spring holds compartment 99 and forms along the recessed recessed portion of the depth direction of bearing 133.Therefore, the direction of the stretching, extension of disc spring 131 and shrinkage direction and niproll 88 up-and-down movements coupling.Therefore, the whole thrust pressure of disc spring 131 is applied on the niproll 88, is used for niproll 88 is pressed against driven roller 87.Certainly the extend/retract direction of disc spring 131 needn't be complementary with the sense of motion of niproll 88, as long as this structure will be applied on the niproll 88 towards the pressure of driven roller 87.Here, disc spring 131 can be made of the spring of leaf spring or other type.Also can use the pressing device of exerting pressure of being used for of other type, for example the elastic component that forms by rubber to niproll 88.

Prodger 135 is bonded in the engaged groove 134 that is formed in the retainer load-carrying element 97.Prodger 135 is a plate type member, and it stretches out downwards from the bottom surface of niproll retainer 96, and extends along the shorter size of niproll retainer 96.Prodger 135 is coupled in the engaged groove 134 with the play of specified degree.Adopt this structure, retainer load-carrying element 97 supports niproll retainers 96, thereby niproll retainer 96 can move along the promptly defeated paper direction of the shorter direction of retainer load-carrying element 97, simultaneously with the limit movement of niproll retainer 96 in specialized range.

Retainer load-carrying element 97 has and niproll retainer 96 similar elongated shapes, and is arranged on the inner frame 95 (referring to Fig. 5), so longitudinal size is aimed at the Width of recording paper.More particularly, on the bottom surface of retainer load-carrying element 97, be formed with projection 140.By these projections 140 are coupled in the hole (not shown) that is formed in the inner frame 95, thereby in position shown in Figure 5, retainer load-carrying element 97 is fixed on the inner frame 95.On the end face of retainer load-carrying element 97, be formed with curved surface 136 (referring to Figure 12).Curved surface 136 supports the bottom surface of niproll retainer 96 by antifriction-bearing box 125.

As shown in figure 10, four engaged groove 134 and four bonding parts 137 are formed in the curved surface 136.As shown in figure 12, the curved surface 136 of retainer load-carrying element 97 is downward-sloping from the upstream side to the downstream along defeated paper direction.Curved surface 136 have with around the roughly consistent arc of periphery through the cylindrical path of the rotation axis of some O (being referred to below as " center of gyration O ") shown in Figure 12.Rotation axis is set at parallel with the pivot center of driven roller 87 (through the axis of the some A among Figure 12) and is set in the vertical direction of this pivot center.Therefore, the pivot center of driven roller 87 and rotation axis fall within the same vertical plane surface.Forming four engaged groove 134 is used for engaging with above-mentioned prodger 135.Engaged groove 134 forms the development length along equidirectional of fully being longer than prodger 135 along the short size of niproll retainer 96.

Shown in Figure 10 and 11, each antifriction-bearing box 125 by along parallel juxtaposed two rollers 126 of the short size of retainer load-carrying element 97 and the roller load-carrying element 127 that is used for supporting rotationally together these two rollers 126 constitute.Roller load-carrying element 127 is installed on the curved surface 136 of retainer load-carrying element 97, and roller 126 is supported in the roller load-carrying element 127.Specifically, on each longitudinal end of roller load-carrying element 127, be formed with a engaging claw 128 with L shaped cross-sectional plane.By these engaging claws 128 being bonded in the set of bond part 137 that is formed at four set of bond parts 137 (referring to Figure 10) in the curved surface 136, thereby roller load-carrying element 127 is installed on the retainer load-carrying element 97.As shown in figure 10, four antifriction-bearing boxs 125 are installed with the interval of regulation along the longitudinal direction of retainer load-carrying element 97.By making antifriction-bearing box 125 between the curved surface 136 of niproll retainer 96 and retainer load-carrying element 97, be supported on the curved surface 136 thereby niproll retainer 96 can be rolled with this structure.But, though multi-function device 1 has provided the example that adopts the supporting construction that antifriction-bearing box 125 supports niproll retainer 96 as being used to roll, but can adopt another kind of structure, this structure is provided with rotating member integratedly, and these rotating members can freely rotate on the curved surface 136 of retainer load-carrying element 97 or on the bottom surface of niproll retainer 96.For example, can expect antifriction-bearing box known in the field or ball bearing of main shaft are combined in the bottom surface of curved surface 136 or niproll retainer 96.

Be formed on the rear end of engaged groove 134 from the curved surface 136 upwardly extending ribs 138 of retainer load-carrying element 97, thereby upwards continue from the inwall and the rear side of engaged groove 134.These ribs 138 are used for limiting the motion backward of niproll retainer 96.In prodger 135 with when engaged groove 134 engages, when niproll retainer 96 according to can be supported on the retainer load-carrying element 97 along the mode that the short size of retainer load-carrying element 97 is moved the time, when the inwall on the front side of the preceding end in contact engaged groove 134 of prodger 135, travelling forward of restriction niproll retainer 96, and when the back end in contact rib 138 of prodger 135, the motion backward of restriction niproll retainer 96.

As shown in figure 12, niproll retainer 96 by on curved surface 136, rolling around axial-movement through center of gyration O.Because at this moment disc spring 131 pushes niproll 88, so niproll 88 outer surface along driven roller 87 when keeping the constant pressure of driven roller 87 moves.Center of gyration O should be located such that: the distance that center of gyration O and curved surface 136 are separated is greater than in the some B at the centre of gration place of niproll 88 and the distance that curved surface 136 separates.

In this example, the movable range along the short size (fore-and-aft direction) of retainer load-carrying element 97 of niproll retainer 96 is limited between transfer position and the retracted position.As shown in figure 12, transfer position be niproll retainer 96 as upper/lower positions, in this position, the straight line O-B that is connecting the centre of gration B of center of gyration O and niproll 88 (fails the upstream of paper direction to the perpendicular line O-A angulation θ 1 (θ 1＞0) of the centre of gration A of driven roller 87 rear sides and process center of gyration O and driven roller 87; Shown in the solid line among Figure 12; Also referring to Figure 17).Retracted position be niproll retainer 96 as upper/lower positions, in this position, straight line O-B and perpendicular line O-A angulation θ 2 (θ 2＞θ 1) are (shown in the dotted line among Figure 12; Also referring to Figure 16).In other words, the motion of niproll retainer 96 in cutaway view is restricted to by the line segment OA that is connecting center of gyration O and centre of gration A and is being connected center of gyration O and angle θ (θ 1≤θ≤θ 2) that the line segment OB of centre of gration B forms.

Adopt this structure of niproll retainer 96 and retainer load-carrying element 97, when the leading edge that conveying roller 89 beginning clampings and feeding recordable paper are opened, niproll retainer 96 moves to transfer position (referring to Figure 17) from retracted position (referring to Figure 16).When feeding recordable paper was opened, niproll retainer 96 remained in the transfer position.When the trailing edge of recording paper left conveying roller 89, niproll retainer 96 moved to retracted position, and niproll retainer 96 maintains in the retracted position when discharging recording paper.

Next will the rolling principle of niproll retainer 96 be elaborated.Figure 13 illustrates the position relation of driven roller 87 and niproll 88.In Figure 13, D represents transfer position, and E represents retracted position.When niproll 88 was in transfer position D, some B1 was positioned on the centre of gration of niproll 88, and some B2 is positioned on the centre of gration of the niproll 88 that is in retracted position E.In this multi-function device 1, when niproll retainer 96 was in retracted position E and is pressed against niproll 88 on the driven roller 87, the depth direction of bearing 133 was represented by the dotted line L1 among Figure 13.Therefore, niproll retainer 96 supports niproll 88, thereby niproll 88 can 87 withdrawals along straight line L1 from driven roller.Straight line L1 in cutaway view through B2, and with respect to through the straight line A-B2 that comprises line segment AB2 of some A and B2 around centre of gration B2 along dextrorotation veer predetermined oblique angle α.In other words, angle [alpha] is by niproll retainer 96 and retainer load-carrying element 97 position in multi-function device 1 and the structures shape of the bearing 133 of niproll retainer 96.That is to say that retainer load-carrying element 97 is fixed on the inner frame 95 of multi-function device 1.Niproll retainer 96 is supported on the curved surface 136.In niproll retainer 96, define the depth direction of bearing 133.Therefore, angle [alpha] is limited by the depth direction and the straight line A-B2 of bearing 133.Niproll 88 can be along the direction withdrawal of the downstream towards defeated paper direction from driven roller 87 with respect to straight line A-B2 angulation α.Should be noted that, niproll retainer 96, curved surface 136, bearing 133 are not limited to above-mentioned these shapes and structure, as long as niproll 88 can be according to being subjected to supporting along the such mode of straight line L1 withdrawal on the direction in the downstream of failing the paper direction from driven roller 87.

As shown in figure 14, when recording paper along through the approaching cramping point P between driven roller 87 and niproll 88 of the tangent line L2 of cramping point P the time with respect to driven roller 87 and niproll 88, the bight along thickness direction on the leading edge of recording paper contacts lip-deep some G1 and the G2 that is positioned at niproll 88 and driven roller 87 respectively.In addition, when driven roller 87 and niproll 88 were in contact with one another at cramping point P place, niproll 88 was located such that: angle [alpha] greater than by driven roller 87 through the omnibearing line L3 of some G1 and the angle beta that straight line A-B2 forms.In other words, angle [alpha] is set for and is made α＞β when niproll 88 is in retracted position E.

More particularly, by coming set angle α by the following angle beta that recording paper limited, this recording paper can be to use in the logging mode of minimum size or the boundless printing model in margin, and has maximum thickness.In other words, the recording paper of maximum ga(u)ge defines contact point G1 and G2.Point G1 defines angle beta.Angle [alpha] is set for and is made α＞β when niproll 88 is in retracted position E.

When printer section 2 is finished in the alignment procedures on the recording paper S and begin to drive that driven roller 87 clockwise rotates so that when the downstream feeding recordable paper of defeated paper direction is opened S in Figure 15, the turning effort of driven roller 87 passes to the end face of recording paper S, thereby the leading edge of recording paper S is drawn to cramping point P.At this moment, niproll 88 is owing to the thrust pressure that the thickness h of recording paper S overcomes disc spring 131 is withdrawn along oblique line L1.

In the moment of conveying roller 89 clamping recording paper S, the spring force F11 of disc spring 131 is applied on the leading edge of recording paper S, as shown in figure 15.Simultaneously, recording paper S will be identical with spring force F11 size and direction opposite reaction F12 be applied to some G1 on the niproll 88.As shown in figure 15, antagonistic force F12 along than oblique line L1 more the direction in downstream apply.Therefore, spring force F11 and antagonistic force F12 produce and to be used for turning effort F13 (component of antagonistic force F12) that niproll 88 is rotated counterclockwise at Figure 15.Therefore, niproll 88 guides the bottom comer on the leading edge of recording paper S smoothly towards cramping point P, thereby conveying roller 89 can clip recording paper S reliably, and can not slide on the leading edge of recording paper S.This structure has prevented to produce in recording paper S after alignment procedures crooked, and guarantees the advance amount of distributed uniform on the leading edge of recording paper S.

Angle beta can be derived from following equation (1), and wherein h is the thickness of recording paper, and R is the radius of driven roller 87, and r is the radius of niproll 88.In this multi-function device 1, angle [alpha] is set at the minimum normal solution greater than equation (1).

h+rcosβ+Rcos(r/R·β)＝R+r (1)

From equation (1), can easily find the threshold value of the angle beta of the α＞β that satisfies condition, thereby be convenient to the location of niproll 88.

In other words, some G1 and G2 are respectively point on the niproll 88 and the point on the driven roller 87, thereby satisfy: the distance between a G1 and G2 is specified length h, and parallel with straight line O-A through the straight line G1-G2 of some G1 and G2.Its cathetus O-A is through center of gyration O and centre of gration A.Angle beta is the angle between straight line A-B2 and straight line G1-B2.Here, straight line A-B2 is through centre of gration A and B2.Straight line G1-B2 is through centre of gration B2 and some G1.That is to say, decide angle beta by separating equation (1) by the radius R of length h, driven roller 87 and the radius r of niproll 88.When niproll 88 is in retracted position E, the depth direction of bearing 133 from straight line A-B2 along the clockwise direction tilt angle alpha, thereby satisfy condition α＞β.

Next, the rolling principle with reference to Figure 18 and 19 pairs of niproll retainers 96 describes.Centre of gration A is arranged on the Y-axis line, and center of gyration O (initial point O) is positioned at along the position of the big distance of the radius R of+Y direction and centre of gration A splitting ratio driven roller 87.Initial point O is consistent with the center of the circular arc of following curved surface 136.Niproll retainer 96 can by around initial point O at the transfer position D along anticlockwise motion angle θ 1 (θ 1＞0) and roll between the retracted position E along equidirectional rotational angle θ 2 (θ 2＞θ 1) from the Y-axis line and to move from the Y-axis line.In order to illustrate, in multi-function device 1, limited the center O shown in Figure 18 and 19, A and B, but it should be obvious that be driven roller 87, niproll 88 and comprise that the center of the cylindrical path of curved surface 136 is not limited to these positions.

In this specification sheets, the angle that is formed by line segment OA and OB when niproll 88 moves to the optional position will be called as θ, and wherein angle θ can drop in range Theta 1≤θ≤θ 2.The disc spring 131 that is contained under compressive state in the niproll retainer 96 pushes niproll 88 towards driven roller 87 (along line segment AB).

As shown in these figures, in θ＞0 o'clock, the center O of circular arc DE not and niproll 88 around the center A coupling of rotating driven roller 87.Therefore, along with θ becomes big, niproll retainer 96 separates with driven roller 87, thereby forces disc spring 131 to stretch.Therefore, the elastic energy E1 in the disc spring 131 becomes big along with θ and reduces.At this moment, moment M1 along around the promptly vertical directive effect of the anticlockwise direction of center-point A with line segment AB on niproll 88.The size of moment M1 is directly proportional with the dE1/d θ that reduces of elastic energy E1.

Simultaneously, when niproll 88 is followed the rotation of driven roller 87, in niproll 88, produce friction force (friction moment) M2 ' along the direction opposite with this hand of rotation around center-point B.Here, M2 will represent the moment that promptly obtains along the power of the direction vertical with line segment AB around an A by friction force M2 ' is converted to.At this moment the friction force M2 ' of Chan Shenging is the static friction force that produces on the slidingsurface of niproll 88 and turning cylinder 130 when niproll 88 rotates.Moment M2 is not shown in Figure 18.

In addition, when rolling on the curved surface 136 of niproll retainer 96 at retainer load-carrying element 97, produce force of rolling friction (friction moment) M3 '.This force of rolling friction M3 ' around center of gyration O promptly along the directive effect vertical with line segment OB.M3 will be used for representing the moment that promptly obtains along the power of the direction vertical with line segment AB around an A by friction force M3 ' is converted to.This moment M3 is not shown in Figure 18.

As shown in figure 19, when driven roller 87 and niproll 88 feeding recordable papers were opened, power W that is produced by the weight of recording paper and the elastic force that caused by the deflection in the recording paper were along the directive effect of the centre of gration B from the contact point between recording paper and niproll 88 to niproll 88.This power W produces along the moment M4 of the direction that θ is diminished.As shown in figure 19, owing to recording paper is carried towards platen 42 with the angle θ identical with the angle that is formed by line segment OA and OB above platen 42, so can not ignore the moment M4 that produces by power W.In this example, EI represents the rigidity of recording paper.

In addition, when the clamp-press part timesharing of leading edge arrival between driven roller 87 and niproll 88 of paper, perhaps the trailing edge when recording paper leaves this clamp-press part timesharing, and the length of spring 131 is along with the thickness h of recording paper changes.Specifically, disc spring 131 shrinks thickness h in the former situation, and stretches thickness h in the latter's situation.Therefore, the elastic energy of disc spring 131 is also fluctuation at this moment, thereby similar with above-mentioned moment M1, produces the moment M5 around an A that size is directly proportional with dE1/d θ.

Because angle θ (θ 1≤θ≤θ 2), the thickness h of recording paper and the rigidity EI of recording paper are variablees, so moment M1 can be by the function representation of θ and h, moment M4 is by the function representation of θ and EI, and moment M5 is the function of h.Though moment M2 and M3 strictness also are the functions of θ and h in fact, these value torque gradients M1, M4 and M5 are much smaller.Therefore, think that moment M2 and M3 are constant.Below, be M1 (θ) and M4 (θ) with the function representation of angle θ.

In multi-function device 1, suppose do not occur between driven roller 87 and the niproll 88 any slip and between driven roller 87 and the niproll 88 and the friction force between niproll 88 and the recording paper enough big, then moment M1-M5 must satisfy following equation.

When driven roller 87 and niproll 88 not when feeding recordable paper is opened, satisfy following equation (2).Here, moment M2 around an A along the clockwise direction effect, and moment M3 around an A along the anticlockwise direction effect.

M1(θ)+M3＞M2 (2)

In this case, niproll retainer 96 is being withdrawn when rolling in the upstream of defeated paper direction backward, and maintains in the retracted position of θ=θ 2.

When recording paper arrives driven roller 87 that the leading edge of cramping part between driven roller 87 and niproll 88 and recording paper is rotated and clips, the equation (3) below satisfying.At this moment, moment M3 around an A along the anticlockwise direction effect.On the other hand, moment M5 around an A along the clockwise direction effect.

M1(θ)+M3＜M4(θ)+M5 (3)

At this moment, niproll retainer 96 rolls to the downstream of defeated paper direction, and maintains in the transfer position of θ=θ 1.In other words, in the situation that niproll 88 clockwise rotates around an A along with the motion of niproll retainer 96, distance between driven roller 87 and niproll 88 increases paper sheet thickness h than the situation that niproll 88 does not move, and that is to say that elastic energy EI diminishes when niproll 88 clockwise rotates.

Equation (4) below just when feeding recordable paper is opened, satisfy.At this moment, moment M2 is around an A cw effect, and moment M3 is also around an A cw effect simultaneously.

M1(θ)＜M2+M3+M4(θ) (4)

Therefore, niproll retainer 96 continues to maintain among the transfer position D of θ=θ 1.

When the clamp-press part timesharing of trailing edge disengaging between driven roller 87 and niproll 88 of recording paper, satisfy following equation (5).At this moment, moment M3 is around an A cw effect, and simultaneously the same with moment M1, moment M5 is around an A conter clockwise effect.

M1(θ)+M5＞M3 (5)

As from equation (5) as can be seen, when the trailing edge of recording paper leaves clamp-press part timesharing between driven roller 87 and niproll 88, have only moment M3 to serve as friction force with respect to the moment M1 that is produced (θ)+M5.But, because the very small friction force of moment M3 for producing by antifriction-bearing box 125, so moment M3 does not serve as the power that promotes recording paper along throughput direction.Therefore, nearly all moment M1 (θ)+M5 is used for making niproll retainer 96 to rotate to the upstream of defeated paper direction.Therefore, niproll retainer 96 is withdrawn and is maintained among the retracted position E of θ=θ 2.

Left after clamp-press part between driven roller 87 and niproll 88 divides at the trailing edge of recording paper, when making driven roller 87 backward rotation, satisfied following equation (6).Therefore, even do not turn back at niproll retainer 96 during the abnormal condition of retracted position E of θ=θ 2, by making driven roller 87 backward rotation, niproll retainer 96 also can roll towards the retracted position E of θ=θ 2.

M1(θ)+M2＞M3 (6)

In this case, moment M2 is around an A conter clockwise effect, and moment M3 is around the effect of center O cw.

In above-mentioned multi-function device 1, niproll retainer 96 is supported rotationally by antifriction-bearing box 125.By niproll 88 and niproll retainer 96, retainer load-carrying element 97, spring 131 are arranged to satisfy equation (2)-(6), thereby can reduce the size that promotes the power of recording paper along defeated paper direction.In addition, by niproll 88 being arranged so that in Figure 14 angle [alpha], make niproll 88 rotate counterclockwise thereby be in the turning effort F13 (referring to Figure 15) that moment that the conveying roller 89 of retracted position E clips produces in the leading edge of recording paper S greater than angle beta.Therefore, conveying roller 89 clamping recording paper S reliably.Therefore, multi-function device 1 can insert recording paper S equably, and can not occur carrying irregular, and can not produce crooked in recording paper S.

By inclination alpha is set at greater than angle beta, produce along the turning effort of the direction that is used to make niproll 88 forward rotation thereby put on the pressure of recording paper S and cooresponding antagonistic force during to conveying roller 89 clampings by that at recording paper S.Therefore, recording paper S is easy to be introduced in the contact point between conveying roller 89, and is held reliably thus.Therefore, the structure decrease of this multi-function device 1 after carrying beginning crooked in recording paper S of appearance, and produce uniform recording paper advance amount, in other words, the structure of this multi-function device 1 is inserted recording paper equably.

Though the present invention is had been described in detail with reference to concrete aspect of the present invention, but it is evident that for those of ordinary skills, can make many modification and variant in the present invention under the situation that does not break away from spirit of the present invention, scope of the present invention is defined by the following claims.For example, image recording structure of the present invention is not limited to be used to supporting construction that niproll 88 is rolled under niproll retainer 96 is supported on situation on the retainer load-carrying element 97, but can use the slide mechanism disclosed in the Japanese laid-open patent application documents No.2004-168451.Slide mechanism disclosed in the document supports driven voller, thereby driven voller can rotate and can be along defeated paper direction sliding motion.When the trailing edge of recording paper leaves clamp-press part timesharing between driven roller and driven voller, driven voller is because from the antagonistic force of recording paper and to the withdrawal of the upstream of defeated paper direction.Can obtain the more details of relevant this mechanism in the superincumbent document.Multi-function device 1 can also be applicable to a pair of conveying roller 89, and this before feeding recordable paper is opened and be fixed in assigned position afterwards consistently, and does not make niproll 88 by rolling or sliding motion to conveying roller 89.

Claims

1. sheet material conveyor comprises:

A pair of conveying roller, they comprise driven roller and driven voller, this driven roller is actuated to rotate around first axle, this driven voller pressure contact driven roller, and the rotation of following driven roller is around second rotational, when driven roller rotates along first hand of rotation, and when driven voller rotates along second hand of rotation opposite with first hand of rotation, these conveying rollers are along sheet material throughput direction conveying recording medium, driven roller and driven voller define nip line between them, the leading edge of recording medium is provided with first bight and second bight, when driven roller and driven voller provide this nip line, this first bight can contact at the contact wire place with driven roller, and this second bight can contact at the contact wire place with driven voller;

Support unit, this support unit supports driven voller, and can make driven voller in the withdrawal plane, leave the nip line withdrawal, this withdrawal plane comprises second axis, on the withdrawal plane with comprise predetermined angle α 1 between the imaginary plane of first and second axis and the angle [alpha] 2 bigger than angle [alpha] 1, support unit allows driven voller to be retracted in the downstream of sheet material throughput direction with respect to this imaginary plane; And

Pushing unit, this pushing unit push driven voller so that nip line to be provided,

Wherein angle [alpha] 1 is than at this imaginary plane with to comprise the angle beta that limits between the sagittal plane of second axis and contact wire big.

2. sheet material conveyor as claimed in claim 1, wherein angle beta is the minimum normal solution of following equation, wherein h is for the thickness of the medium carried and equal distance between first bight and second bight, and R is the radius of driven roller, and r is the radius of driven voller;

h+rcosβ+Rcos(r/R·β)＝R+r。

3. sheet material conveyor as claimed in claim 1, wherein said pushing unit is pushing driven voller on the direction on withdrawal plane.

4. sheet material conveyor as claimed in claim 1, wherein when the medium of carrying will contact with conveying roller, described driven roller is carried out at least one process in maintenance process and the reverse procedure, in this maintenance process, driven roller suspends specified time, in this reverse procedure, driven roller is actuated to rotate along second hand of rotation.

5. image recording structure comprises:

Sheet material conveyor, this sheet material conveyor comprises:

Wherein angle [alpha] 1 is than at this imaginary plane with to comprise the angle beta that limits between the sagittal plane of second axis and contact wire big; And

Image recording unit, this image recording unit is document image on the sheet pumped (conveying) medium of being carried by sheet material conveyor.

6. image recording structure as claimed in claim 5, wherein said image recording unit comprises injection unit, this injection unit sprays little ink droplet on the medium of carrying.