CN100389024C - Image-recording apparatus - Google Patents

Abstract

A plurality of nip rollers are provided under a driving roller approximately in a direction of a drive shaft of the driving roller. Respective shafts of the nip rollers are arranged so that the rotary shafts are inclined toward a downstream side in a transport direction of a recording medium with respect to the drive shaft of the driving roller. Nip positions for the recording medium, formed by the nip rollers and the driving roller, are positioned on an upstream side in the transport direction above the lowermost end portion of the outer circumference of the driving roller. Therefore, the recording medium is transported at a satisfactory accuracy in an image-recording section, thereby avoiding the deterioration of the recording quality which would be otherwise caused by the positional deviation of the recording on the recording medium.

Description

Image recording structure

Technical field

The present invention relates to a kind of image recording structure, utilize driven roller on the relative position be located at transfer path respectively and niproll and clamping transmits recording medium, utilize the image record portion in the downstream that is located at this driven roller and niproll that image is recorded on the aforementioned recording medium.

Background technology

Figure 21 represents the peripheral structure of the image record portion on the existing image recording structure.As shown in the figure, upside at transfer path 90 is provided with record head 91, and this record head 91 can scan, and scans and sprays ink along the width of record-paper, at the downside of the transfer path 90 relative, be provided for supporting the pressing plate of the record-paper that is writing down with this record head 91.And, respectively with the relative position of transfer path 90 on, at the upstream side of the direction of transfer of record head 91 driven roller 93 and niproll 95 are set in couples, set out paper bowl 94 in the downstream in couples and quicken roller 96.In addition, on driven roller 93 and exit roller 94, never drive source such as illustrated motor is via transmission of drive force such as gears.On the other hand, niproll 95 can be set up or down and quicken roller 96, and respectively by spring etc. to the driven roller 93 or the exit roller 94 side application of forces, thereby with driven roller 93 or exit roller 94 crimping.

The record-paper P that utilizes the never illustrated paper pallet of conveyer to transmit is by the driven roller 93 of upstream side and niproll 95 clampings and be sent on the pressing plate 92.When the front end of record-paper P arrived the below of record head 91, record head 91 began scanning, and ink is ejected on this record-paper P from record head 91.Line feed amount with regulation intermittently drives above-mentioned driven roller 93 and niproll 95, this driven roller 93 and niproll 95 are each intermittently the time, record head 91 scans, and carries out this action repeatedly, thus on the regulation zone of the record-paper P that transmits with regulation line feed amount document image.And when the front end of record-paper P arrived the exit roller 94 in downstream and quickens roller 96, the front of record-paper P was by exit roller 94 and quicken roller 96 clampings, and rear end side driven rolls 93 and niproll 95 clampings, carries out the image record under this state.Like this, in the upstream side of record head 91 and downstream respectively by roller clamping record-paper P, thereby pay the suitable tension force of record-paper P.When the ink droplet from record head 91 ejections is bound on the record-paper P,, utilize this tension force can make the record-paper P on the pressing plate 92 keep smooth though the solvent of this ink droplet evaporates immediately and shrinks on record-paper P.In addition, when transfer sheet P, the rear end of record-paper P is by driven roller 93 and niproll 95, and this record-paper P is transmitted by the exit roller 94 and the acceleration roller 96 in downstream.And the record-paper P of image record end also by exit roller 94 and acceleration roller 96, is discharged to not shown paper delivery pallet.

Figure 22 is that expression is located at the driven roller 93 of upstream side of record head 91 and the vertical view of niproll 95.As shown in the figure, with respect to a driven roller 93, arrange with predetermined distance vertically four niprolls 95 are set.The axle of driven roller 93 is spool parallel with each niproll 95, and shown in the oblique line among the figure, driving shaft 93 and each niproll 95 be crimping and form clip position N respectively in the wire zone parallel with axle.Therefore, though record-paper P is driven rolls 93 and niproll 95 clampings on four wire clip position N, but when record-paper P passes through this clip position N, the chucking power that driven roller 93 and niproll 95 produce is temporarily decontroled, and apply the active force of each niproll 95 to the rear end of record-paper P, thereby release record-paper P to direction of transfer.

On the other hand, as shown in figure 21, be located at the acceleration roller 96 in record head 91 downstreams and since directly be bound to ink droplet after the recording surface of record-paper P contact, so, then cause on this recording surface problems such as remaining trace if push to exit roller 94 sides brute force.Therefore, can not apply strong extruding force to quickening roller 96.Therefore, the chucking power of exit roller 94 and 96 couples of record-paper P of acceleration roller has to weaken, as mentioned above, even when record-paper P passes through the clip position N of driven roller 93 and niproll 95, produce release power, also can't utilize the chucking power of exit roller 94 and 96 couples of record-paper P of acceleration roller to limit this release power.Therefore, owing to there is this release power,, be transmitted more than the line feed amount of regulation promptly so-called " transition " so cause record-paper P to skid off from the clip position between exit roller 94 and the acceleration roller 96.When this transition took place, the recording position shift of sub scanning direction produced inequality or dawn on the document image.

As the countermeasure that addresses this is that, be well known that the structure shown in Figure 23 A (with reference to patent documentation 1).In this structure, a big driven roller 97 directly with respect to record head 91 upstream sides, diameter less than this driven roller 97 and with two niprolls 98 of coniform formation large-diameter portion and minor diameter part as a pair of arranged coaxial of carrying out, make its each large-diameter portion be positioned at two ends, thereby form a roller group 99, driven roller 97 axially on arrange with predetermined distance four roller groups 99 be set.In addition, the axle of each roller group 99 is configured to the axle predetermined angular that only tilts with respect to driven roller 97, and makes this inclination angle, this inclination angle of two roller groups 99 that are located at both end sides greater than two roller groups 99 that are located at driven roller 97 center side.Thus, the clip position N between driven roller 97 and each niproll 98 forms point-like, and the position of direction of transfer is offset each other.Therefore, record-paper P passes through the time migration of each clip position N separately, and the clamping of driven roller 97 and 98 couples of record-paper P of niproll is decontroled interimly, thereby can suppress the transition of record-paper P.

Patent documentation 1: the spy opens flat 2002-226077 communique

In addition, according to patent documentation 1 following content is disclosed: with configuration niproll of the corresponding relation shown in Figure 23 B (corresponding with Fig. 4 (b) of patent documentation 1) and driven roller.Niproll (hold-down roller) 98 is rotatably installed on the rotating shaft of being located on the not shown support.As mentioned above, with respect to the rotating shaft inclination predetermined angular of driven roller 97 and the rotating shaft of niproll 98 is installed.By spring to the described support application of force, thereby niproll 98 is squeezed in the top of driven roller 97, the large-diameter portion 98a of niproll 98 and 98d be crimped on the driven roller 97 and form clamping.At this moment, by large-diameter portion 98a and driven roller 97 formed clip positions with all be in by large-diameter portion 98d and driven roller 97 formed clip positions driven roller 97 topmost the below and be in the direction of transfer downstream.Shown in Figure 23 B,, and compare more close direction of transfer downstream with driven roller 97 formed clip positions by large-diameter portion 98a by large-diameter portion 98d and driven roller 97 formed clip positions.Therefore, in the structure of patent documentation 1, recording medium, in its front by the roller group clamping in image record portion downstream and under the state that transmits on the transfer path, the rear end is crossed the position, the top of driven roller and is descended, and interim ground separates with clip position.Promptly, recording medium is with respect to the contact final position of niproll with driven roller, with consistent by large-diameter portion 98d and driven roller 97 formed clip positions, therefore, the rear end of recording medium, separate with clip position under the state of descent direction trending towards, become free state immediately, therefore be easy to come-up.When float in the rear end, diminish the flatness of whole recording medium, owing to, therefore produce the problem that diminishes recording quality not producing impartial gap in the image record portion between recording medium and the record head.

And in patent documentation 1, the large-diameter portion of niproll and the clip position of driven roller depart from direction of transfer, and are transmitting after with the recording medium aligned in position along the end avris of direction of transfer one side.Therefore, when the recording medium of clamping width size outside specification, clip position on the width of recording medium is asymmetric, with respect to the niproll of recording medium and driven roller contact the starting position or clip position departs from direction of transfer, therefore may transmit recording medium obliquely to direction of transfer.

As mentioned above, the external diameter of each niproll 98 is along axially changing with taper, and, its axle is tilted with respect to driven roller 97.In addition, upward niproll 98 is rotatably installed in and is located at, and be squeezed on the driven roller 97 by on the rotating shaft on the spring energized support.According to the position of niproll 98 with respect to driven roller 97, each niproll 98 on roller group 99 and the position N of driven roller 97 crimping are not the left-right symmetry position with respect to the axle vertical with the rotating shaft of roller in a roller group 99 sometimes.In this case, because the diameter of the niproll 98 on the clip position is different on the roller of the left and right sides, so different about the rotary speed of driven niproll 98 with the rotation of driven roller 97.In order to tackle this situation, left and right sides niproll 98 must independent rotation.As described in patent documentation 1, under left and right sides niproll 98 can the axle situation that rotate freely with respect to roller group 99, can consider to make each niproll 98 can be with respect to moving axially, and make the interval of a clip position N on the roller group 99 can change.So, the position that causes being difficult to accurately setting the direction of transfer of each clip position N.On the other hand, in order left and right sides niproll 98 to be fixed on the axle and left and right sides niproll to be rotated equally, must make taper certain, make the external diameter left-right symmetry of each niproll 98, and must position with respect to driven roller 97, therefore make left and right sides niproll rotate equally, cause the assembling of the manufacturing of niproll 98 and driven roller 97 and each roller group 99 loaded down with trivial details.

But, as described in patent documentation 1, when niproll rotatably being supported on the rotating shaft of being located on the support (hold-down roller support) (back shaft), and when being squeezed in this support on the driven roller by spring, then the counter-force of this extruding force acts in the bearing portion of back shaft.But, because support and niproll generally are synthetic resin materials such as ABS, and the back shaft of niproll is metal (steel), so when making the rotation of niproll and back shaft one in order to transmit recording medium, plastic bearing portions is cut down, and produces noise problem.And when the reduction of above-mentioned bearing portion became big, then the shaft core position of back shaft was away from driven roller, and dock with the outer peripheral face of driven roller on the surface (transmission plane) of opposite support, thereby cause holding paper.In addition, when driven roller was hard material, the surface of support was cut down.

Even be head it off lubriation material such as coating lubricant in bearing portion, when sneaking into lubricating oil as the paper powder of recording medium, this paper powder plays a role as grinding agent, also can cause bearing portion more and more weakened.In addition, when coating lubricant in bearing portion, under the situation that environment temperature raises, there is lubricating oil liquefy etc. and adheres to and the problem of the recording medium of making dirty.

Though be configured as the D type profile for addressing the above problem a part that it is also conceivable that the axle head periphery that makes back shaft,, if the diameter of back shaft is little, then be difficult to process.And bearing portion also must form D type hole, and manufacturing cost raises, and the operation that back shaft is assembled into bearing portion is also bothered.

Summary of the invention

The present invention promptly makes in view of the above problems, and its purpose is to provide a kind of device that can suppress the transition of recording medium simply, reliably and prevent the document image deterioration of image recording structure.And, the present invention also aims to provide a kind of image recording structure, utilize the transmission precision of image record portion transmission recording medium good, and can prevent to descend because of the recording position shift for recording medium causes recording quality.In addition, the present invention also aims to provide a kind of image recording structure, needn't form processing to back shaft, niproll is successfully rotated, and can eliminate the reduction equivalent damage of bearing portion, can reliably utilize image record portion to transmit recording medium, assembling function admirable and cheap.

According to the invention provides a kind of image recording structure, comprising: the image record portion and the transfer path that is used for recording medium is sent to this image record portion that are used for document image on recording medium; Be arranged on this transfer path driven roller and thereupon driven a plurality of niprolls between clamping recording medium and transmitting; It is characterized in that roughly the direction along the driving shaft of this driven roller has a plurality of described niprolls below described driven roller, and each rotating shaft of above-mentioned a plurality of niprolls is configured to tilt with respect to the driving axial direction of transfer downstream of above-mentioned driven roller; Described niproll and driven roller are positioned at the top at the position bottom of above-mentioned driven roller periphery to the clip position of recording medium, and are positioned at the direction of transfer upstream side.

According to the present invention, because the rotating shaft of niproll is arranged to tilt with respect to the driving shaft of driven roller, and niproll and driven roller are to the clamping of recording medium, by forming with the same number of a plurality of points of niproll, so on the width of recording medium, compare during the clamping recording medium with contacting by line, when clamp position is decontroled, can reduce power to the unnecessary release recording medium of direction of transfer.

According to the present invention, because each clip position is positioned at the top at the position bottom of above-mentioned driving shaft periphery, and be positioned at the direction of transfer upstream side, niproll and driven roller and the downstream that final position is positioned at clip position that contacts recording medium, so rear end of recording medium, after leaving clip position, further guided to the below of clip position, so stop and the contacting of driven roller by periphery along the driven roller lower end side.Therefore, can suppress its rear end and upwards float and transmit, can keep the flatness on whole surface.Consequently, can realize high-precision transmission, and the recording quality of lossless image record portion.

In image recording structure of the present invention, each rotating shaft of described a plurality of niprolls can be configured to the side end near the substantial middle position of the width that intersects vertically with described transfer path direction of transfer in its both ends to tilt to the direction of transfer downstream.In this case, because niproll is to the both end sides rotation of the length direction of direction of transfer when transmitting, the tension force of the described two side ends that stretches acts on the recording medium, thus can prevent from deflection or wrinkle etc. take place near the central portion of recording medium, and be sent to image record portion.

In image recording structure of the present invention, the configuration of described a plurality of niprolls can form following shape: on the width of described transfer path, be the bilateral symmetry at center with the substantial middle position of its width.In this case, can be along the width balance of recording medium clamping recording medium well.

In image recording structure of the present invention, the profile of described niproll is that the regulation zone that comprises clip position on the axis direction of niproll can form same diameter.In this case, compare when forming taper, when setting clip position, can reach and be easy to the effect of aliging with driven roller with the profile of niproll.

At image recording structure of the present invention, either party or two sides' periphery in described driven roller and the described niproll, described at least clip position can be formed by the rubber-like elasticity material.In this case, make the compression of rubber-like elasticity material, thereby on a plurality of clip positions, only in each small scope, form curved contact.Therefore, when recording medium leaves clip position, decontrol the above-mentioned effect that is produced except the clamp position of a plurality of points (clip position), on each clip position, can decontrol clamp position rallentando, thereby can improve the effect that suppresses unnecessary release recording medium.

In image recording structure of the present invention, at least two rollers in described a plurality of niprolls can be arranged to tilt, and the axis of its rotating shaft is configured in roughly parallel with the described transfer path face abreast to same direction.In this case, be configured in rotating shaft and compare when same axle is gone up, in the time of can dwindling the configuration niproll on direction of transfer, occupy the space niproll.

In image recording structure of the present invention, can be alignd with the substantial middle position of the width of described transfer path in the substantial middle position of the width of described recording medium and transmit.In this case, also on the width of transfer path, niproll is configured to, form symmetric shape with centrical both sides, the substantial middle position of its width, mutually combine like this, balance clamping well transmits recording medium even the size difference of the described width of recording medium usually also can be along width.

In image recording structure of the present invention, can make to the described niproll of same direction tilted configuration and the clip position of described driven roller, be positioned on the same straight line that intersects vertically with direction of transfer and extend.At this moment, even the size difference of the width of the recording medium that is transmitted, and this is of a size of out-of-spec size, usually also can begin clamping with the same position on the direction of transfer, and can transmit recording medium along the width balance clamping well of recording medium usually with respect to the front end of recording medium.

In image recording structure of the present invention, can transmit described recording medium via U type turning transfer path to described clip position from the below of described clip position.At this moment, draw via U type turning transfer path from the below and transmit recording medium, in other words, even need bigger chucking power between driven roller and the niproll, because the clamp position between driven roller and the niproll is decontroled, so recording medium can be sent accurately to image record portion, and can not discharge recording medium redundantly.

In image recording structure of the present invention, can on described niproll, form depressed part respectively, and form respectively the clamping part with described driven roller crimping respectively in the axial both sides of this depressed part.In this case, on each niproll, form depressed part respectively, and form respectively clamping part respectively in the axial both sides of this depressed part with the driven roller crimping, described niproll arrangement is arranged to make its axial direction of transfer inclination predetermined angular with respect to driven roller, thereby on each niproll, transmit recording medium by clamping between two places on the direction of transfer and the driven roller.Thus, owing to can disperse the clamp pressure of niproll and driven roller, and when the rear end of recording medium is passed through, separately decontrol the clamping of niproll and driven roller at this two place, so when niproll and driven roller are decontroled clamping to recording medium, the power that transmits this recording medium to direction of transfer can be weakened, and the transition of recording medium can be suppressed.Therefore, can realize near a kind of image recording structure that can the recording medium rear end, not produce the image confusion.

In image recording structure of the present invention, near the rear end of clamping recording medium at least and when transmitting, can carry out driving at intermittence to above-mentioned driven roller with the unit transmitting range of regulation; Each clamping part of described each niproll respectively can be more than described unit transmitting range with the separating distance of the direction of transfer of each clip position of driven roller crimping.In this case, because when the rear end of transmitting recording medium at least is neighbouring, with the unit transmitting range above-mentioned driven roller is carried out driving intermittence, each clamping part of above-mentioned each niproll respectively with the separating distance of the direction of transfer of each clip position of driven roller crimping more than above-mentioned unit transmitting range, so when between each clip position at niproll of the rear end of recording medium, driven roller must be intermittently.Thus, the time that near two places the rear end of each niproll and the recording medium of driven roller clamping can be decontroled respectively separates reliably, thereby the release power of the clamping that can suppress the direction of transfer upstream side by the clamping in direction of transfer downstream when decontroling.

In image recording structure of the present invention, each clamping part of described each niproll can form same diameter.In this case, because each clamping part of above-mentioned each niproll forms same diameter, so align easily with the niproll of the two places crimping of driven roller.

In image recording structure of the present invention, each clamping part of described each niproll and the clip position of described driven roller crimping, on direction of transfer, have upstream side clip position group and downstream clip position group, in upstream side clip position group, clip position is positioned on first straight line that intersects vertically with direction of transfer, in the clip position group of downstream, clip position is positioned on second straight line that intersects vertically with direction of transfer.In this case, because each clamping part of above-mentioned each niproll and each clip position of above-mentioned driven roller crimping, in each clip position group of clip position group that is in the direction of transfer upstream side and the clip position group that is in the downstream, be positioned on the same straight line that intersects vertically with direction of transfer, so, for example when the front end that makes recording medium docks with driven roller and tilts rectification, can make this docking location is same position with respect to direction of transfer, and owing to the time of clamping recording medium front end is the same time, so have the advantage that can not transmit recording medium obliquely.

In image recording structure of the present invention, can be corresponding to multiple recording medium size to be transmitted, described each niproll is arranged near the two ends of width of various recording mediums.In this case, because corresponding to multiple recording medium size to be transmitted, described each niproll is arranged near the two ends of width of various recording mediums, so can balance clamping well transmit various recording mediums.

In image recording structure of the present invention, can dispose described niproll with respect to the center left and right symmetrically of the width of transfer path.In this case, because the center left and right symmetrically with respect to the transfer path width disposes described niproll, so can balance clamping well transmission be the various recording mediums that benchmark transmits with this center, especially effective for the recording medium except that shaping size.

In image recording structure of the present invention, the end of central side that each of described each niproll can be configured to the width of its transfer path tilts to the direction of transfer downstream.In this case, because being configured to the end of central side of the width of its transfer path, each that will described each niproll tilt, so on the tension force of the width outside expansion of transfer path acts on recording medium by driven roller and the transmission of each niproll clamping to the direction of transfer downstream.Thus, can prevent to take place on the recording medium deflection or wrinkle etc.

In image recording structure of the present invention, the transfer path of described driven roller and niproll upstream side can be from this clip position leader record medium of following direction of the clip position of this driven roller and niproll.And in image recording structure of the present invention, described transfer path also can make recording medium U type turning from bottom to top and channeling conduct.Transfer path when above-mentioned driven roller and niproll upstream side, from the below of the clip position of driven roller and niproll with the recording medium guiding when this clip position, especially when transfer path make recording medium from bottom to top the U type turn and during channeling conduct, in order to transmit recording medium upward by means of the conveying capacity of driven roller and niproll, require driven roller and niproll to have bigger chucking power, the release power when decontroling this clamping is especially effective when big.

In image recording structure of the present invention, described image record portion can comprise and be used to spray ink and carry out the ink jet print head of image record.Described image record portion is comprised be used to spray ink and carry out the ink jet print head of image record, then particularly effective when the transition that the rear end produced of driven roller and niproll transmission recording medium makes image deterioration.

In image recording structure of the present invention, only on the axle of niproll, a niproll is set.In this case, owing to respect to the axle of driven roller a roller only is set, pair roller positions easily.

In image recording structure of the present invention, the depressed part of described niproll can be the groove cylindraceous that axially intersects vertically with this niproll.In this case, because the simple shape of depressed part, so easily niproll is processed.

In image recording structure of the present invention, the depressed part of described niproll can be the groove that forms to the axioversion of this niproll.In this case, the clip position at niproll two ends gradually changes along with the rotation of roller.Therefore, when arranging obliquely when a plurality of niproll is set with respect to the driving shaft of driven roller along the driving shaft of driven roller below the driven roller, the clip position of each roller has nothing in common with each other on the direction that the direction of transfer with recording medium intersects vertically.Thus, the time of clamping recording medium can be disperseed to decontrol, thereby the power of releasing recording medium can be suitably adjusted.

In image recording structure of the present invention, the both ends that are used for rotatably supporting the back shaft of described niproll are carried out axle by bearing portion and are supported; Described bearing portion has the clutch shaft bearing portion and the second bearing portion, wherein, this clutch shaft bearing portion is used for supporting the upstream side of direction of transfer outer peripheral face, recording medium at described back shaft both ends and the sidepiece in downstream, this second bearing portion is used to support the both ends of described back shaft, so that it can not come off; On at least one end of described back shaft, embed axle rotation stopping parts, and with this rotation stopping component limitations in the described second bearing portion.At this moment, bearing portion is made of the clutch shaft bearing portion and the second bearing portion, wherein, this clutch shaft bearing portion is used for supporting the upstream side of direction of transfer outer peripheral face, recording medium at described back shaft both ends and the sidepiece in downstream, this second bearing portion is used to support the both ends of described back shaft, so that it can not come off; On at least one end of described back shaft, embed axle rotation stopping parts, and with this rotation stopping component limitations in the described second bearing portion.Therefore, because a back shaft of rotation stopping parts is installed can not be rotated with respect to the second bearing portion, thus have only niproll to rotate smoothly, and can eliminate the reduction equivalent damage of bearing portion, thereby can reliably transmit recording medium, reach the effect that prevents image recording quality deterioration.

In image recording structure of the present invention, described axle rotation stopping parts can form interference fit and embed the shape of described back shaft.In this case, owing to described axle rotation stopping parts form the shape that interference fit embeds described back shaft, so form the simple structure that only axle rotation stopping parts is embedded at least one end of back shaft, needn't carry out the processing that is shaped to back shaft, thereby manufacturing cost can not raise a lot.And, because niproll and back shaft also are an end parts of the back shaft of rotation stopping parts one side will be installed earlier be embedded in the second bearing portion, so assembling operation is good for the assembling operation of bearing portion.

In image recording structure of the present invention, clutch shaft bearing portion can be configured in the side near the niproll end face, clamping described clutch shaft bearing portion and the described second bearing portion is configured in a side away from the niproll end face; The second bearing portion can have a pair of fastening pawl that is used to fasten described axle rotation stopping parts.In this case, owing to clutch shaft bearing portion is configured in a side of close niproll end face, clamping described clutch shaft bearing portion and the described second bearing portion is configured in a side away from the niproll end face, and the second bearing portion has a pair of fastening pawl that is used to fasten described axle rotation stopping parts, so an end parts of the back shaft of rotation stopping part one side will be installed earlier to be embedded in the second bearing portion, make back shaft turn back to level afterwards, only back shaft is not come off from bearing portion, thereby can further improve assembling operation by this simple operations.

In image recording structure of the present invention, integrally formed described clutch shaft bearing portion and the described second bearing portion on the guide member of described transfer path can constituted.In this case, owing to integrally formed described clutch shaft bearing portion and the described second bearing portion on the guide member that constitutes described transfer path, so can reach the effect of simplified structure.

In image recording structure of the present invention, described niproll and described axle rotation stopping parts can be made of synthetic resin, and back shaft is made of metal.In this case, because described niproll and described axle rotation stopping parts are made of synthetic resin, back shaft is made of metal, so utilize described axle rotation stopping parts that bolster can not be rotated, can not cut down bearing portion, so the posture of niproll can not change, can reach and prevent the recording medium effect of deterioration year in year out.

In image recording structure of the present invention, described axle rotation stopping parts can be the material with high frictional property with respect to back shaft.At this moment, when described axle rotation stopping parts are when having the material of high frictional property with respect to back shaft, can reach to prevent that these rotation stopping parts from carrying out relative the rotation with respect to bolster with the second bearing portion simultaneously.

In image recording structure of the present invention, described axle rotation stopping parts can be for having the metal flat pattern of the inserting hole that can insert logical described back shaft; And a plurality of inboard circular protrusions that enter can be set on described inserting hole, and described each projected front ends portion arrives the outer peripheral face of described back shaft, and interference fit embeds this back shaft.In this case, because described axle rotation stopping parts are the metal flat pattern with the inserting hole that can insert logical described back shaft, and a plurality of inboard circular protrusions that enter are set on described inserting hole, described each projected front ends portion arrives the outer peripheral face of described back shaft, and interference fit embeds this back shaft, so axle rotation stopping parts that will this metal flat pattern are securely fixed on the back shaft, as long as these rotation stopping parts are fixed, it can not be rotated on the suitable position of the support portion of bearing or niproll get final product.

In image recording structure of the present invention, described axle rotation stopping parts can be metal flat patterns, and can have the tongue piece that embeds the opening groove in the described second bearing portion and stop described back shaft rotation.In this case, because described axle rotation stopping parts are metal flat patterns, and has a tongue piece that embeds the opening groove in the described second bearing portion and stop described back shaft rotation, dwindle a shape of rotation stopping parts so can reach minimumly, and prevent the effect of the rotation stopping effect deterioration of back shaft.

In image recording structure of the present invention, can with in the both ends of each back shaft of described a plurality of rollers near and the side end at the substantial middle position of the width that intersects vertically of the direction of transfer of described transfer path be configured to tilt to the direction of transfer downstream.In this case, on the width of transfer path niproll being configured to the substantial middle position of its width is the both sides formation symmetric shape at center, even the size difference of the above-mentioned width of recording medium also can transmit recording medium along the clamping well of width balance usually.

In image recording structure of the present invention, can be on the width of described transfer path, dispose described a plurality of roller about the substantial middle position left and right symmetrically of its width.At this moment, even the size difference of the width of the recording medium that is transmitted, and when this is of a size of out-of-spec size, usually also can be with respect to the front end of recording medium, begin clamping with the same position on the direction of transfer, and can transmit recording medium along the width balance clamping well of recording medium usually.

In image recording structure of the present invention, can also comprise paper feeding cassette and be used for and be deposited in the paper feed that recording medium in the paper feeding cassette is sent to transfer path.In this case, owing in paper feeding cassette, prepare a large amount of recording mediums, so recording medium can be supplied to transfer path continuously.

Description of drawings

Fig. 1 is the perspective view that the outward appearance of the image recording structure 1 in the expression embodiment of the present invention constitutes;

Fig. 2 is the longitudinal section that the inside of presentation video tape deck 1 constitutes;

Fig. 3 is the vertical view that the image recording structure of image read-out is removed in expression;

Fig. 4 be along IV-IV line among Fig. 3 to looking cutaway view;

Fig. 5 is the perspective view of the formation of expression guide member 28;

Fig. 6 is the perspective view of the formation of expression niproll 43;

Fig. 7 is the vertical view of the position relation of expression driven roller 42 and each niproll 43;

Fig. 8 is near the amplification plan view of the niproll 43 in the end of expression driven roller 42;

Fig. 9 is the perspective view that the image recording structure of balladeur train is removed in expression;

Figure 10 is the vertical view that the state of niproll is supported in expression;

Figure 11 is the pattern cutaway view of the position relation of explanation driven roller and niproll;

Figure 12 is the pattern vertical view of the configuration of explanation niproll;

Figure 13 supports the vertical view that the 2nd of niproll transmits wall;

Figure 14 is the amplification plan view of support portion of niproll of the axle rotation stopping parts of first embodiment;

Figure 15 A be along the XVa-XVa line of Figure 14 to looking cutaway view, Figure 15 B be along the XVb-XVb line of Figure 14 to looking cutaway view;

Figure 16 is the pattern cutaway view that is used to illustrate the installation exercise of niproll;

Figure 17 A is the rearview of the axle rotation stopping parts of the 2nd embodiment, and Figure 17 B is a side view, and Figure 17 C is a front view;

Figure 18 is that the axle rotation stopping parts with the 2nd embodiment are installed in the perspective view on the back shaft;

Figure 19 A is the cutaway view of the support portion of niproll, and Figure 19 B is an amplification view;

Figure 20 is the skeleton diagram that is formed with the niproll of skewed slot with respect to roll shaft;

Figure 21 is the figure of the peripheral structure of the image record portion in the existing image recording structure of expression;

Figure 22 be expression in the existing image recording structure driven roller 93 and the vertical view of niproll 95;

Figure 23 is the driven roller in the image recording structure of expression patent documentation 1 and the vertical view of the configuration of niproll, and Figure 23 B is the cutaway view of driven roller and niproll.

The specific embodiment

First embodiment

With reference to description of drawings image recording structure of the present invention.Fig. 1 is the figure that the outward appearance of the compounding machine (image recording structure) 1 of expression embodiment of the present invention constitutes.This image recording structure 1 is that the bottom has the multi-function device (MFD:Multi Function Device) that printing portion 2 and top one have scanner section 3, has printing function, scan function and copy function.Printing portion 2 in this image recording structure 1 is equivalent to the image recording structure among the present invention, and the function beyond the printing function is arbitrarily.Therefore, the printer that does not have scan function or copy function even there is not scanner section 3 also may further include Department of Communication Force, thereby has facsimile function etc.And, image recording structure of the present invention is being used as under the situation of compounding machine, can be the such midget plant of the image recording structure 1 shown in the present embodiment, also can be the large-scale plant with a plurality of paper feeding cassettes and automatic document feeder (ADF:Auto Document Feeder).In addition, though image recording structure 1 main and not shown computer links to each other, view data that sends according to this computer and file data and image or file are recorded on the record-paper, but, in addition, also can link to each other with digital camera and with the Imagery Data Recording of digital camera output on record-paper, or load various recording mediums and will be recorded in view data on this recording medium etc. and be recorded on the record-paper.

As shown in Figure 1, the profile of image recording structure 1 is cuboid substantially, and the bottom of image recording structure 1 is a printing portion 2.Printing portion 2 forms opening 2a in the front, with two-layer paper supply tray 20 and the paper delivery pallet 21 of being provided with up and down, make and expose this opening 2a.Paper supply tray 20 is used to store the record-paper as recording medium, can accommodate the record-paper of various sizes such as A4 size, B5 size, postcard size, can pull out slide tray 20a as required and enlarges the pallet face.Transmit to the inside of printing portion 2 and note the desired image that obtains being contained in record-papers (not shown) in this paper supply tray 20, afterwards, row is to paper delivery pallet 21.

The top of image recording structure 1 is scanner section 3, constitutes so-called flat-bed scanner.As depicted in figs. 1 and 2, but freely openable be arranged to the downside of original copy cover plate 30 of the top board of image recording structure 1, pressuring plate glass 31 and image are set read balladeur train 32.Pressuring plate glass 31 is used to place and carries out the original copy that image reads, below this pressuring plate glass 31, setting is that the image of main scanning direction reads balladeur train 32 with the depth direction of image device 1, and this image reads balladeur train 32 and can scan along the width (the Y direction among Fig. 1) of image recording structure 1.

In the front upper of image recording structure 1, be provided for the guidance panel 4 that printing portion 2 and scanner section 3 are operated.Guidance panel 4 is made of various action buttons and liquid crystal display part, image recording structure 1 can move according to the operation indication from this guidance panel 4, also can link to each other with computer and move by the indication that printer driver sent according to this computer.For example, on the upper left quarter in image recording structure 1 front, be provided with the socket 5 that can load as the various small-sized memory cards of recording medium, can read the view data that is recorded on the small-sized memory card that fills in this socket 5, and be presented on the liquid crystal display part, and can import, thereby arbitrary image is recorded on the record-paper by printing portion 2 by guidance panel 4.

In the present embodiment, in not shown ink storage portion, single print cartridge as every kind of color, contain black (Bk), dark green (C), pinkish red (M), yellow (Y) print cartridge of all kinds, under normal conditions, utilize and to have flexible ink supply conduit the record head (ink jet print head) 40 in each print cartridge and the record portion (image record portion) 24 shown in Figure 4 is coupled together.

In the bottom of this shell 102, configuration can be from its front side the paper feeding cassette (paper supply tray) 20 that inserts of opening (peristome) 2a in (left side Fig. 2).In the present embodiment, paper feeding cassette 20, for example make the minor face that is cut into A4 size, Letter size, legal size, postcard size equidimension as the paper P of recording medium, extend along the direction that intersects vertically with paper direction of transfer (X-direction) (in Fig. 2, being Y direction), plurality of sheets of paper stacked (accumulation) is got up to accommodate.

In the inboard (right side among Fig. 2) of paper feeding cassette 20, the separation hang plate 22 that the configuration separation is used.And, as shown in Figure 4, in shell 102 sides, the base end part of the sheet supplying arm on the paper feed 106 26 is mounted to and can rotates along the vertical direction, by being located at the gear transmission mechanism (drive transmission mechanism) 27 in the sheet supplying arm 26, will pass to the paper feed roller of being located on these sheet supplying arm 26 leading sections 25 (with reference to Fig. 4) from the rotation of not shown drive source.And, by this paper feed roller 25 with separate hang plate 22, separate to transmit the paper P that is deposited in the paper feeding cassette 20 one by one as recording medium.Paper P after the separation sends the record portion (image record portion) 24 of the upside (high position) of being located at paper feeding cassette 20 rears to via the transfer path 23 that comprises towards the U of side type turning path.

As Fig. 2 and shown in Figure 4, as the transfer roller that is used for paper P is sent to the lower surface of record head 40, at the direction of transfer upstream side configuration driven roller 42 of pressing plate 41, and below relative with this driven roller 42 configuration niproll 43.Hereinafter this driven roller 42 and niproll 43 are elaborated.In addition, in the transmission downstream of pressing plate 41, configuration transmits the exit roller 44 that (discharge) drives to paper delivery portion (paper delivery pallet) 21 for the paper P that record is finished, and relatively disposes the acceleration roller 45 that is used for to the exit roller 44 side application of forces therewith.

As shown in Figure 2, be formed with paper delivery portion 21 at the upside of paper feeding cassette 20, the paper P recording surface that this paper delivery portion 21 will utilize record portion 24 to write down is discharged up, and the peristome 2a of exit slot 110a that is communicated with paper delivery portion 21 and shell 102 front surfaces is opening commonly.And, from the lower surface of the guide member 123 in paper direction of transfer downstream to the exit slot 110a of shell 102 front ends, form the plastic dividing plate (lower cover) 129 that covers paper delivery portion 21 tops with shell 102.

Below, with reference to Fig. 2 and Fig. 4 the inside of image recording structure 1 is constituted, especially the formation to printing portion 2 describes.As shown in the figure, in the inboard of the paper supply tray 20 of being located at image recording structure 1 bottom, configuration is used to make record-paper separation that is deposited on the paper supply tray 20 and the separation hang plate 22 that upwards guides, and upwards forms transfer path 23 from this separation hang plate 22.This transfer path 23 earlier towards the top, afterwards to the face side bending, extends to face side from the rear side of image recording structure 1, by leading to paper delivery pallet 21 after the image record portion 24.Therefore, be housed in the record-paper in the paper supply tray 20, be transmitted the mode channeling conduct of turning with U type from bottom to top in path 23 and arrive image record portion 24, undertaken being discharged to paper delivery pallet 21 after the image record by this image record portion 24.

As shown in Figure 4, at the upside of paper supply tray 20, be provided for separating piled one by one on paper supply tray 20 record-paper and be supplied to the paper feed roller 25 of transfer path 23.This paper feed roller 25, axle is supported on the front end 26a of sheet supplying arm 26, and this sheet supplying arm 26 can engage or move up and down discretely with paper supply tray 20, and the drive transmission mechanism 27 that utilizes a plurality of gears engaged to form transmits the driving of motor (not shown) and is rotated.It can serve as that axle is swung along above-below direction with cardinal extremity 26b that sheet supplying arm 26 is arranged to, and under holding state, takeoffs (state shown in Figure 4) downward side oscillation when the supply record-paper to upside by not shown paper heating clutch or spring etc.By making sheet supplying arm 26 downward side oscillations, the paper feed roller 25 that axle is supported on its front end is crimped on the surface of the record-paper on the paper supply tray 20.Under this state, make paper feed roller 25 rotation, thereby utilize the roll surface of paper feed roller 25 will be in the record-paper row of uppermost position to separating hang plate 22 with frictional force between the record-paper.This record-paper, its front end is upwards guided with separating hang plate 22 butt joints, and sends into transfer path 23.In addition, when utilizing paper feed roller 25 to discharge to be in the record-paper of uppermost position,, docked with separating hang plate 22 by wrong like this record-paper of discharging, thereby can stop though discharging record-paper under it simultaneously because of friction or electrostatic interaction sometimes.

Except the position of configuration image record portion 24 grades, between with predetermined distance opposite external side guide surface 160 (first transmits wall) and inboard guide surface 152 (second transmits wall), form transfer path 23.For example, the transfer path 23 of the rear side of image recording structure 1 is formed with guided outside face 160 with the framework of image recording structure 1, and constitutes guide surface 152 in the framework by guide member 28 is fixed on.In addition, on transfer path 23, especially at the position of transfer path 23 bendings, make various transfer rollers 29 laterally guide surface 160 or inboard guide surface 152 expose roll surface, and can be with the width of transfer path 23 for axially rotating freely.Utilize above-mentioned each transfer roller 29, successfully transmit the record-paper that contacts with guide surface.

As shown in Figure 4, the downstream after transfer path 23 U type turning from bottom to top is provided with image record portion 24.This image record portion 24, be provided with the ink jet print head 40 that is loaded on the not shown scanning balladeur train, the line scanning of going forward side by side of dark green (C) that ejection is supplied by not shown print cartridge, pinkish red (M), yellow (Y), black (K) each chromatic ink, thus the record-paper that is transmitted on pressing plate 41 carries out the image record.Record head 40 can scan along main scanning direction (Y direction) and sub scanning direction (directions X).

Especially as Fig. 3 and shown in Figure 9, record portion 24 is located between rectangular the 1st and the 2nd tabular guide member 122,123, the the described the 1st and the 2nd guide member 122,123 is supported by the main frame 121 and the pair of right and left side plate 121a thereof of box, and extends along Y direction (main scanning direction).The balladeur train that is mounted with ink jet recording head 40 105 in the record portion 24 can be supported (loading) across the 2nd guide member 123 in the 1st guide member 122 of paper direction of transfer upstream side and downstream with being free to slide, and can be moved back and forth.

For balladeur train 105 is moved back and forth, on the upper surface of the 2nd guide member 123 that is disposed at paper direction of transfer (arrow A direction) downstream, along main scanning direction (Y direction) synchronous belt 124 is set with extending, to be used to drive CR (balladeur train) motor (not shown) of this synchronous belt 124, be fixed on the lower surface of the 2nd guide member 123.

As shown in Figure 3 and Figure 4, the pressing plate 41 of the flat of relatively extending along Y direction with the lower surface of record head 40 on the balladeur train 105 is fixed on the main frame 121 between guide sections part 122,123.

As shown in Figure 4, upstream side in above-mentioned image record portion 24, driven roller 42 and the niproll pressure roller of clamping record-paper (and between the driven roller) 43 is set, this driven roller 42 and be clamped in the record-paper that transmits on the roller 43 clamping transfer paths 23, and be sent on the pressing plate 41.On the other hand, the downstream in image record portion 24 is provided for clamping and transmits exit roller 44 and the acceleration roller 45 that writes down the record-paper that finishes.On driven roller 42 and exit roller 44, never illustrated motor transmission of drive force, and carry out intermittence driving with the line feed amount of regulation.On the other hand,, it is crimped on the driven roller 42, and niproll 43 can be set with rotating freely these niproll 43 application of forces.Niproll 43, when record-paper enter into and driven roller 42 between the time, the thickness part of only keeping out of the way this record-paper, and with driven roller 42 clamping record-papers is transmitted the revolving force of driven roller 42 to record-paper reliably.Be arranged on similarly on the exit roller 44 though quicken roller 45 because the record-paper crimping that finishes with record, so on roll surface formation spur shape concavo-convex, to prevent to be recorded in the image deterioration on the record-paper.

Therefore, on pressing plate 41 with the line feed amount indexing transfer of regulation by the record-paper of driven roller 42 and niproll 43 clampings, when entering a new line, ink jet print head 40 scans at every turn, carries out the image record from the front of record-paper.Then, carry out the front of the record-paper after image writes down, by exit roller 44 and 45 clampings of acceleration roller, the front of this record-paper is by exit roller 44 and quicken roller 45 clampings, rear end side driven rolls 42 and niproll 43 clampings in this state, are carried out indexing transfer with the line feed amount of regulation, similarly, carry out the image record by ink jet print head 40.In addition, when transfer sheet, the rear end of record-paper is by driven roller 42 and niproll 43, and the clamping of above-mentioned parts is decontroled, and carries out indexing transfer by exit roller 44 and acceleration roller 45 with the line feed amount of regulation, similarly carries out the image record by ink jet print head 40.On the regulation zone of record-paper, carry out after the image record, drive exit roller 44 rotations continuously, the record-paper of exit roller 44 and acceleration roller 45 clampings is arranged to paper delivery pallet 21.

Describe driven roller 42 and niproll 43 in detail with reference to Fig. 5.Fig. 5 is the figure of expression guide sections part 28, and each niproll 43 axle respectively is supported on the guide member 28.Guide member 28 is formed with the guide surface 70 as the inboard guide surface 152 of transfer path 23, is fixed on by formed installation portion 71 on its two ends on the framework etc. of image recording structure 1.Guide surface 70, upstream side forms crooked from bottom to top curved surface, and the downstream basically forms plane, suitably forms guiding rib 72 along direction of transfer on guide surface 70, thereby can reduce the contact area of record-paper and guide surface 70, and reduces friction.

In addition, on guide member 28, form breach 73 to direction of transfer with predetermined distance from the downstream of guide surface 70, thereby this downstream end is divided into four parts, on each partitioning portion, form niproll support portion 74.This niproll support portion 74 is wider than niproll 43 axial length ground depression a little, uprightly is provided for the support chip 75 that axle supports niproll 43 respectively in its both end sides.In addition, on support chip 75, be formed for supporting the bearing of the rotating shaft of niproll 43.Each niproll 43 axle respectively is supported on two support chips 75, is arranged to from guide surface 70 part of its roll surface outstanding.This roll surface guides the record-paper that transmits to contact with guide surface 70.Get final product from guide surface 70 outstanding height though suitably set each niproll 43, preferably identical with the height of above-mentioned guiding rib 72.In addition, on the bottom surface of each niproll support portion 74, be formed with spring support 76 respectively, between framework of this spring support 76 and image recording structure 1 etc., helical spring 158 (with reference to Fig. 9) be set respectively, thereby upward to each niproll support portion 74 application of force.Guide member 28 by synthetic resin etc. can strain raw material constitute, and owing to there is above-mentioned breach 73, strain takes place in each niproll support portion 74 easily along the vertical direction, so each niproll 43 is to not shown driven roller 42 application of forces of side disposed thereon, and can according to and driven roller 42 between the thickness of record-paper of clamping keep out of the way to downside.Like this, the axially-aligned along driven roller 42 is provided with four niprolls 43.

Fig. 6 represents the structure of niproll 43.As shown in the figure, niproll 43 is rotatably installed in resinous roller 51 on metal axle (bar) 50.And, also can hold roller 51 with respect to axle 50 rotation earth's axis propclips by the described method of the 3rd embodiment hereinafter.The material of roller 51 preferably is out of shape few rigid plastics, in addition, and axle 50 that also can substituted metal system and adopt helical spring axle backing roll 51.On this roller 51, leave regulation zone at the two ends of roller 51 and form the depressed part 52 of radially subsidence.That is the big central portion (52) therebetween of the diameter of the axial both sides of roller 51 (53L, 53S).In the regulation zone that depressed part 52 both sides are left, become the clamping part 53L, the 53S that are used for driven roller 42 crimping.As described later, though each niproll 43 50 is arranged to axle with respect to driven roller 42 towards direction of transfer inclination predetermined angular with it, because axle 50 is tilted, the clip position that forms so niproll 43 and driven roller 42 join is not wire but point-like.On the existing position of the clip position of this point-like, form above-mentioned depressed part 52, thereby in clamping part 53L, 53S two places and driven roller 42 crimping of depressed part 52 both sides.Be clamping zone (clip position) N with this region representation among the figure.Because each clamping part 53L, 53S form same diameter, so the both sides of depressed part 52 become the clip position N on clamping part 53L, the 53S.Therefore, the distance between the clip position N is according to the width of depressed part 52 and difference according to the angle of inclination of this distance with niproll 43, is set the separating distance of two clip position N on direction of transfer.Set this depressed part 52, make that this separating distance is that driven roller 42 carries out intermittently driving and the unit transmitting range of transfer sheet.

In addition, in the present embodiment, though the axial width difference of clamping part 53L, 53S, and clamping part 53L is widened with respect to clamping part 53S, but the width of each clamping part 53L, 53S, be to consider to transmit by driven roller 42 and niproll 43 clampings to set, be not particularly limited this width to the transmission angle of the record-paper of pressing plate 41 etc.In detail, as shown in Figure 4, niproll 43 is on the position of driven roller 42 upstream sides on the direction of transfer.That is, owing to join, so, be discharged from than inclined to one side predetermined angular under the horizontal direction by this driven roller 42 and niproll 43 clampings and the record-paper that transmits at maximum height position downside and the driven roller 42 of niproll 43.Thus, record-paper is crushed on the pressing plate 41 and transmits, thereby can keep the distance between ink jet print head 40 and the record-paper certain.Consider the angle of discharging record-paper, set the position relation between driven roller 42 and the niproll 43 and the angle of inclination of niproll 43, and setting makes clip position N be in the position where of roller 51, utilize above-mentioned relation setting clamping part 53L, 53S and width.

Fig. 7 represents the configuration of each niproll 43 with respect to driven roller 42.As shown in the figure, a driven roller 42 axially on the row shape four niprolls 43 (43a～43d) is set.Axial width as roller, this driven roller 42 has the corresponding logical paper width of record-paper with multiple sizes such as A4 size to be transmitted or postcards at least, this roller coated with ceramic coating and record-paper is applied frictional force on the surface of metal roller, vary with temperature the conveying capacity height of sensitivity and record-paper, therefore very suitable.In this printing portion 2, owing to the width center C that makes transfer path 23 (single-point line shown in Figure 7) transmits with the center of record-paper is consistent, so each niproll 43, the record-paper of multiple size to be transmitted corresponding to A4 size or postcard etc. is configured at left and right symmetrically on the width near the two ends of record-paper of each size.For example, two niproll 43a, 43d of the both end sides among Fig. 7 are neighbouring corresponding with the two ends of A4 size, and two niproll 43b, 43c of central authorities are corresponding with the postcard size.Like this, by niproll 43 being configured near the two ends of record-paper, can balance clamping well and transmit the record-paper of various sizes.In addition, by dispose each niproll 43 all right balance clamping well and transfer sheet with respect to the center C left and right symmetrically, especially during the record-paper beyond transmitting shaping sizes such as A4 size or postcard size, can set clip position N with respect to this record-paper left and right symmetrically, thus very suitable.

And the axle 50 of each niproll 43 is with respect to the axle inclination predetermined angular θ of driven roller.As shown in the figure, each of four niproll 43a～43d 50 is configured to predetermined angular θ, makes the end of center C side of the width that is in transfer path 23 become the direction of transfer downstream.Promptly, the axle 50 of two niproll 43c, the 43d on figure right side is to the upper right side tilt angle theta, the axle 50 of two niproll 43a, the 43b in figure left side is to the upper left side tilt angle theta, though the incline direction of the axle 50 of two niprolls 43 in the axle 50 of the niproll 43 on figure right side and figure left side is with respect to the center C left-right symmetry, the angle θ of Qing Xieing is identical separately.Therefore, as shown in the figure, on the record-paper P that transmits in driven rolls 42 and each niproll 43 clamping, apply to the tension force of width outside expansion and transmit by driven roller 42 and each niproll 43.Thus, can prevent that record-paper P produces deflection or wrinkle etc. in transport process.

As shown in Figure 7, dispose each niproll 73, make the clamping part 53L of wide cut be in the direction of transfer downstream.Wherein, with the clip position on each clamping part 53L as N1, with the clip position of each clamping part 53S as N2, then constitute each clip position N1 of the clip position group that is in the direction of transfer downstream, be positioned on the straight line L1 that intersects vertically with direction of transfer, each the clip position N2 that constitutes the clip position group that is in the direction of transfer downstream is positioned on the straight line L2 that intersects vertically with direction of transfer.Like this, because each clip position N1, N2 are laid respectively on straight line L1, the L2, so the time of driven roller 42 and each niproll 43 clamping record-paper P is the same time on the width of record-paper P.Especially, help to make the front end of record-paper P to dock with the driven roller 42 that is in halted state and the clip position N1 or the roll surface of each niproll 43, and along this clip position N1 rectification of tilting, and, afterwards, the time of driven roller 42 and each niproll 43 clamping record-paper P front end is the same time, so have the advantage that can not tilt when transmitting recording medium P.And as mentioned above, each clamping part 53L, 53S of each niproll 43 form same diameter, thus for each clip position N1, N2 are positioned on each straight line L1, L2, make identical the getting final product of tilt angle theta of each niproll 43, thereby alignment easily.In addition, as shown in Figure 6, each clamping part 53L, 53s are by being integrally formed on the roller 51 at formation depressed part 52 on the roller 51 of each niproll 43.Therefore, when transfer sheet P, clamping part 53L, 53S can not move vertically.That is, owing to clip position N1, N2 can not move vertically, so when transfer sheet, can keep above-mentioned alignment clip position N1, N2 afterwards yet.

Fig. 8 is that example is represented the state of record-paper P rear end by clip position N1, N2 with the niproll 43d of Fig. 7 right-hand member.As mentioned above, on niproll 43, form depressed part 52, make the axle inclination predetermined angular θ of the axle of this niproll 43 with respect to driven roller 42, thereby as shown in the figure, make clamping part 53L, the 53S of depressed part 52 both sides and each clip position N1, N2 of driven roller 42 crimping, and separating distance W only between each position L1, L2 on the direction of transfer.The clamping of driven roller 42 and 43 couples of record-paper P of each driven roller is separately on clip position N1, N2 and disperse clamp pressure, and, when the rear end of record-paper 9 is passed through, owing to the clamping of on this clip position N1, N2, separately decontroling record-paper P, so when decontroling separately, the active force of each niproll 43 acts on the record-paper P, compares when angle θ is not set, and power from this record-paper P to direction of transfer that release diminishes.

In addition, the distance W of the direction of transfer between above-mentioned clip position N1, the N2 is more than the unit transmitting range of the driven roller 42 that is used for intermittently driving.Thus, when the rear end of record-paper P during by clip position N1, N2, as shown in the figure, when the rear end of record-paper P is between each clip position N1, N2, the action of driven roller 42 must intermittently can separate the time that the clamping of each clip position N1, N2 is decontroled reliably.Therefore, by by clip position N2 clamping record-paper P, the release power in the time of can suppressing clamping on the clip position N1 and decontrol.In addition, as mentioned above, because each clamping part 53L, 53S be integrally formed on the roller 51, so clip position N1, N2 can not move vertically, thereby it is constant to keep above-mentioned distance W usually.

Wherein, be used for the unit transmitting range of the driven roller 42 that intermittently drives, line feed amount that needn't be when utilizing image record portion 24 to carry out the image record on record-paper P is consistent.This line feed amount is along with changes such as image packing densitys, and generally speaking, the line feed amount that picture quality is higher than the fine mode image record of normal mode image record reduces.That is,,, can change the line feed amount according to the picture quality that is write down though above-mentioned distance W is set at necessarily as the printing portion 2 of image recording structure 1.For example, when clip position N1, N2 were passed through in the rear end of record-paper P, with small transmitting range transfer sheet P, drove the intermittence of further dividing driven roller 42 in detail in order to be divided into the line feed amount a plurality of, at this moment, with the small transmitting range that is divided into as the unit transmitting range.Like this, be not limited to the line feed amount that changes according to image packing density etc., for with the rear end of record-paper P the transmitting range during by clip position N1, N2 as above-mentioned small transmitting range, as long as the driving at intermittence to drive motor 41 is controlled, can make the relation between above-mentioned distance W and the unit transmitting range certain.

Like this, according to the printing portion 2 of this image recording structure 1, the transition the when clamping that can suppress record-paper P rear end is decontroled, and can prevent near the confusion of the document image this rear end.Especially, as the printing portion 2 of this image recording structure 1, be in the transfer path 23 of driven roller 42 and niproll 43 upstream sides, record-paper P is turned below clip position N1, the N2 with the U type and guiding during adopting to the so-called U type turning path of clip position N1, N2, by driven roller 42 and niproll 43 record-paper P is drawn upward and to transmit, so must increase chucking power on clip position N1, the N2.In this case, it is big that the release power when decontroling owing to this clamping also is tending towards becoming, and therefore above-mentioned effect is remarkable.

In the first embodiment, though form the depressed part of niproll vertically with cylindrical shape, as shown in figure 20, also can be formed slopely depressed part 301 vertically.

Second embodiment

Second embodiment of image recording structure of the present invention is described.In the present embodiment, adopt the niproll different with first embodiment.The image recording structure of present embodiment as outside the feature of following explanation, has the structure identical with the image recording structure of first embodiment basically.As shown in Figure 9, driven roller 42 extends more longways along the direction (Y direction) that intersects vertically with direction of transfer, and its two ends are supported on the side plate 121a of main frame 121 by axle, thereby never illustrated drive source drives its rotation to driven roller 42 transmission of drive force.As Fig. 9 and shown in Figure 10, roughly the axis direction along driven roller 42 is provided with a plurality of niprolls 251.

In the present embodiment, be provided with four niprolls 251 (marking label 251a, 251b, 251c, 251d respectively), cover rubber-like elasticity material 157 and form each niproll 251 in the periphery of the plastic pipe that has embedded metal rotating shaft (back shaft) 153.At least with the clip position of driven roller 42 on this rubber-like elasticity material 157 of configuration get final product.And the profile of niproll 251 preferably makes the regulation zone that comprises clip position on its axis direction form same diameter, wherein, along the length direction of above-mentioned pipe the rubber-like elasticity material is installed continuously.In addition, for example, also can be respectively cover the rubber-like elasticity material of ring-type, at the rubber-like elasticity material of the central portion coiling different material of pipe at the both ends of above-mentioned pipe.On the other hand, can be on the surface of metal shaft coated with ceramic particle etc. and form driven roller 42.In addition, the raw material of driven roller 42 and niproll 251 peripheries is not limited to above-mentioned material, can adopt any materials.For example, can apply the rubber-like elasticity parts on driven roller 42, coated with ceramic etc. on niproll 251 also can adopt other raw materials, can not produce to slide as long as can suitably carry out clamping in transmitting paper P process and wait.

Four above-mentioned niprolls 251 are configured in the inboard guide surface 152 (second transmits wall) that constitutes transfer path (transport path) 23 with the row shape, and can be supported with rotating freely.This inboard guide surface 152 is made by synthetic resin, and forms more longways along the direction (Y direction) that intersects vertically with direction of transfer (throughput direction).On the upper surface of inboard guide surface 152, outstanding a plurality of projecting strip parts 154 that extend along direction of transfer are set, and crooked downwards and form the end limit of direction of transfer upstream side.The end in direction of transfer downstream is divided into four support chip portions 156 along direction of transfer with three switch-in parts 155 that linearity runs through, the single support niproll 251 of difference in each support chip portion 156.The end in the direction of transfer downstream of support chip portion 156 forms concavity, and niproll 251 is installed in each support chip portion 156, makes it roughly be in identical height and position with above-mentioned projecting strip part 154 front ends in the position topmost.

And, between the lower surface and main frame 121 of each support chip portion 156, corresponding to the position of each niproll 251 helical spring 158 is installed respectively, as niproll 251 being carried out the force application apparatus (force application part) of the application of force, thereby can carry out the application of force to driven roller 42 sides to each niproll 251 reliably to driven roller 42 sides.

As Figure 10 and shown in Figure 12, when being installed in above-mentioned niproll 251 on the inboard guide surface 152, near the end of width central part one side, supported obliquely in rotating shaft 153 both ends of niproll 251 to direction of transfer downstream (arrow A direction).In Figure 10 and Figure 12, with the central part of the width of transfer path 23 as center line B, and with single-point line expression.And with being configured to of niproll 251, its both sides are boundary's left-right symmetry shape with center line B on width, and to the axis of the rotating shaft 153 of the niproll 251 of same direction tilted configuration, by configured in parallel in basic parallel face with transfer path.Promptly, shown in the diagrammatic top view of Figure 12, the rotating shaft 153 that will be positioned at two niproll 251c, the 251d on center line B right side is configured to the upper right side tilt angle theta, with respect to this, the rotating shaft 153 that will be positioned at two niproll 251a, the 251b in center line B left side is configured to the upper left side tilt angle theta.And the clip position N10 of niproll 251 and driven roller 42 is positioned on the same straight line C that intersects vertically with direction of transfer.This straight line of expression C in Figure 12.In addition, because paper P has thickness, so paper P with respect to the upstream side that starting position R10 is positioned at clip position N10 that contacts of driven roller 42 and niproll 251, contacts the downstream that final position R20 is positioned at clip position N10.Four contact starting position R10 with respect to paper P are positioned on the same straight line C1 that intersects vertically with direction of transfer, and four contact final position R20 are positioned on the same straight line C2 that intersects vertically with direction of transfer.

And, as shown in figure 11, the clip position N10 of driven roller 42 and 251 couples of paper P of niproll, the S of position bottom that is positioned at apart from driven roller 42 peripheries only is the upper side of Δ H, and the S of position bottom that is positioned at apart from driven roller 42 peripheries only is the direction of transfer upstream side of Δ L, and the S of position bottom of driven roller 42 is consistent with the contact final position R20 with respect to above-mentioned paper P.

In the image recording structure 1 that constitutes like this, as utilizing relation with Fig. 2 describes, instruction according to the image record, the paper P that is in the superiors among the paper P that is deposited in the paper feeding cassette 20 is advanced by means of the rotation of paper feed roller 25, make its front end and separate hang plate 22 butt joints, and by transfer path 23 channeling conducts.Paper P utilizes transfer path 23 U type turning from bottom to top, and when its front end arrived straight line C1 shown in Figure 12, driven roller 42 began to contact with niproll 251, when arrival straight line C goes up, carries out clamping with the regulation active force.

Because the rotating shaft 153 of niproll 251 is arranged to tilt with respect to the driving shaft of driven roller 42,, in the present embodiment, on four clip position N10 (point), carry out clamping so driven roller 42 and niproll 251 carry out contacting.Therefore, with contact and the rear end of clamping paper P by long line, and once decontrol this clamp position (θ=0 °) time and compare, have enough chucking powers between niproll 251 and the driven roller 42, and can reduce along the power of direction of transfer with the unnecessary discharge in rear end of paper P.

As shown in figure 11, clip position N is positioned at the top of driven roller 42 lowest positions S, and is in the direction of transfer upstream side.Therefore, owing to the rear end of paper P with clip position N10 separate become free state after, guided downwards along the curved surface of driven roller 42 lower end side and advanced, and arrived the lowest positions S of the contact final position R20 of paper P, so become the state that can suppress to float.Therefore, can keep the original flatness of paper P and be sent to record portion 24,, thereby can not diminish recording quality on the whole surface of paper P because the gap between record head 40 and the paper P keeps evenly.

On clip position N10, niproll 251 is made of rubber-like elasticity material 157, and niproll 251 is carried out the application of force to driven roller 42 sides, so on above-mentioned clip position N10,157 compressions of rubber-like elasticity material, thus curved contact can strictly in small scope, be formed.Therefore, because when separated with clip position N10 the rear end of paper P, the clamp position that described curved contact produced was decontroled gradually, therefore can further improve the effect that prevents the unnecessary discharge of paper.

Utilize transfer path 23 to make paper P center-aligned and transmit, both sides at the center line B of transfer path 23 dispose above-mentioned niproll 251 with the left-right symmetry shape, and clip position N10 is configured on the straight line C, interosculate like this, when the size of the width of paper P not simultaneously (not for example, W1 among Figure 12, situation shown in the W2), even this is of a size of the size beyond the specification, because the both sides left and right symmetrically at paper P center line B carries out clamping, so chucking power becomes on width evenly, thereby can transmit paper P as the crow flies and can not tilt to the direction of transfer downstream.In addition, no matter be the paper of which kind of size, when arriving straight line C, its front end can both carry out clamping with the active force of regulation.In other words, though the change in size of paper, because clip position can not depart from direction of transfer, so the transmission condition can not produce standard deviation.

As shown in figure 12, niproll 251, the end that is in above-mentioned center line B side in its rotating shaft 153 both ends tilts to the direction of transfer downstream.In other words, in the paper P reinforcing that is transmitted by this niproll 251, make the dual-side (outside of width) of direction of transfer (arrow A direction) extension from center line B side direction along paper P discharge, therefore, the tension force of stretching to above-mentioned dual-side layback acts on the paper P.Thus, can prevent near the center line B of paper P, to produce wrinkle or deflection, and can keep paper P flatly to be sent to record portion 24.

In addition, in the present embodiment, owing to paper feeding cassette 20 is configured in the below of record portion 24, and via drawing paper P from the below and transmit in U type turning path, so compare when paper P being sent to record portion from the top, driven roller 42 and niproll 251 necessary powerful clamping paper P, thereby have stronger active force to act on the niproll 251.Therefore, in the image recording structure 1 of this strong chucking power type, the above-mentioned structure that prevents the unnecessary discharge in paper P rear end can reach extremely significant effect.

The 3rd embodiment

The 3rd embodiment of image recording structure of the present invention is described.In the present embodiment, adopt the niproll that is different from first embodiment, the bearing portion and the axle rotation stopping parts of niproll.The image recording structure of present embodiment, except the feature of following explanation, basic image recording structure with first embodiment has same structure.With second embodiment in the same manner, adopt configuration illustrated in fig. 9 that driven roller 42 and niproll 151 (with the driven driven voller of driven roller) are set.

As Figure 13 and shown in Figure 14, each niproll 151 is pipes that synthetic resin is made, and is little along the diameter of the central portion 167a of axis direction, and two large-diameter portion 167b, 167b of its both sides are as the transition that alleviate paper P with the clamping part of driven roller 42.Each niproll 151 rotatably is embedded on the metal back shaft 153, and can be supported with rotating freely.On niproll 151, can not shown rubber-like elasticity material be installed continuously along the length direction of above-mentioned pipe.In addition, for example also can cover the rubber-like elasticity material of ring-type respectively in the both ends of above-mentioned pipe side, the rubber-like elasticity material of coiling different material on the central portion of pipe.On the other hand, can also be on the surface of metal shaft coated with ceramic particle etc. and form driven roller 42.In addition, the raw material of driven roller 42 and niproll 151 peripheries is not limited to above-mentioned embodiment, for example can on driven roller 42, apply the rubber-like elasticity parts, coated with ceramic etc. on niproll 151, also can adopt other raw materials, can not produce to slide as long as in transmitting paper P process, can carry out suitable clamping and wait.

As Figure 13 and shown in Figure 14, with first and second embodiment in the same manner, be on the inboard guide surface 152 (second transmits wall) at the guide member that constitutes transfer path 23 inboards, with four niprolls 151 of row shape configuration, and can carry out axle support with rotating freely.This inboard guide surface 152 is supported by synthetic resin, forms more longways along the direction (Y direction) that intersects vertically with direction of transfer.Transmit the 2nd and outstanding on the upper surface of wall 152 a plurality of projecting strip parts 154 that extend along direction of transfer to be set, and crooked downwards and form the end limit that inboard guide surface 152 is in the direction of transfer upstream side.Inboard guide surface 152 is in the end in direction of transfer downstream, is divided into four support chip portions 156 along direction of transfer with three switch-in parts 155 that linearity cuts.The end that each support chip portion 156 is in the direction of transfer downstream forms the recess that is open upwards, and niproll 152 is configured on this recess.On the both ends, the left and right sides of the recess of above-mentioned each support chip portion 156, the integrally formed bearing portion at the both ends of the back shaft 153 of single support niproll 152 respectively that is used for.

Shown in Figure 14, Figure 15 A and Figure 15 B, this bearing portion comprises: a pair of clutch shaft bearing 157a of portion, upstream side and downstream side to the direction of transfer of the paper P in the periphery at back shaft 153 both ends support, width is identical with the diameter of the back shaft 153 that positions, and is the U word grooved that is open upwards; With a pair of second 157b of bearing portion, the another side in the periphery at back shaft 153 both ends (upside) supported, it can not come off.Configuration niproll 151 forms second 157b of bearing portion in the outside of a pair of clutch shaft bearing 157a of portion between a pair of clutch shaft bearing 157a of portion.Shown in Figure 15 B, form a pair of fastening pawl 161 in the upper end of second 157b of bearing portion, at this downside that fastens pawl 161 being formed width dimensions is the downward opening groove 162 of W1.

As shown in figure 14, at least one end of back shaft 153, embed the axle rotation stopping parts 159 of tubulose.Axle rotation stopping parts 159 are limited by a pair of fastening pawl 161 of second 157b of bearing portion.Axle rotation stopping parts 159 are made of plastic high friction means, for example are thermoplastic elastomer (TPE) (rubber-like elasticity material).Because axle rotation stopping parts 159 carry out interference fit with back shaft 153, so axle rotation stopping parts 159 can not come off from back shaft 153 simply, and axle rotation stopping parts 159 can not rotate relatively with back shaft 159.The outer peripheral face of axle rotation stopping parts 159 can be circle, makes its outer circumference diameter bigger than the width dimensions W1 of opening groove 162, thereby a rotation stopping parts 159 is fastened on the opening groove 162 securely, and limit.In addition, the outer peripheral face of axle rotation stopping parts 159, for be easy to and a pair of fastening pawl 161 and opening groove 162 between fasten, also can on the circular circumference face, projection be set, or form the polygon outer peripheral face.

Shown in the double dot dash line among Figure 16, when niproll 151 is installed, make the end that a back shaft 153 of rotation stopping parts 159 1 sides is installed downward-sloping with niproll 151, be inserted between a side the 157a of clutch shaft bearing portion and second 157b of bearing portion opening groove 162 below.Then, make back shaft 153 horizontal, an end of this back shaft 153 is carried out axle by the U word slot part of a 157a of clutch shaft bearing portion and is supported, thereby the upper surface side of the axle rotation stopping parts 159 of its front firmly is limited on a pair of fastening pawl 161, and can not come off.The other end axle of niproll 151 is supported on the opposing party's the 157a of clutch shaft bearing portion and second 157b of bearing portion.And, because back shaft 153 can not rotate relatively with respect to axle rotation stopping parts 159, and niproll 151 can rotate relatively with back shaft 153, so when paper P driven rolls 42 and niproll 151 clampings, and driven roller 42 driven so that its when rotation, back shaft 153 does not rotate, and has only niproll 151 rotations.

Adjust the height and position of the U word groove of a pair of clutch shaft bearing 157a of portion, make that the front end of formed projecting strip part 154 roughly is in equal height on the position, the top of niproll 151 left and right sides and the inboard guide surface 152.

In addition, between the lower surface and main frame 121 of each support chip portion 156, position corresponding to each niproll 151 is installed helical spring 158 respectively, to driven roller 42 sides niproll 151 is carried out the force application apparatus of the application of force as being used for, thus can be on each niproll 151 to the driven roller 42 sides application of force reliably.And, as mentioned above, on at least one end of each niproll 151, embed axle rotation stopping parts 159, fasten with axle rotation stopping parts 159, making can not be with respect to being rotated on second 157b of bearing portion and can upwards not coming off, and, back shaft 153 is installed, make and can not rotate relatively with respect to axle rotation stopping parts 159.Therefore, back shaft 53 can not be rotated with respect to second 157b of bearing portion, has only niproll 151 to rotate with driven roller 42.Therefore, can be not as prior art, when metal back shaft during with respect to the rotation of plastic bearing portion etc., cut down bearing portion and make the bearing height of niproll 151 produce deviation, thereby cause noise problem.

The 4th embodiment

The axle rotation stopping parts 163 of the 4th embodiment of Figure 17～shown in Figure 19 are metal flat pattern.Shown in Figure 17 A～C, axle rotation stopping parts 163 comprise: be formed with the annular body 164 of inserting hole 165, wherein this inserting hole 165 is used to embed back shaft 153; With the tongue piece 166 that extends from the part of these main body 164 peripheries.Shown in Figure 17 B, tongue piece 166 extends with respect to the surface tilt of main body.The a plurality of grooving 164a that on main body 164, are communicated with inserting hole 165 with radial setting, and along the circumferential direction form a plurality of projection 165a that separate.This projection 165a (the side face position of inserting hole 165), outstanding to the inside from the plane of main body 164, when embedding back shaft 153, have elasticity.Shown in Figure 17 A, the tongue piece 166 from main body 164 is extended forms width dimensions W2 (＜W1 (with reference to Figure 15 B)), makes that the width dimensions that can embed second 157b of bearing portion is on the opening groove 162 of W1.

The following describes these rotation stopping parts 163 to the mounting means of niproll 151 with to the mounting means of the bearing portion of niproll 151.Shown in Figure 18, Figure 19 A and Figure 19 B, an end of the back shaft on the niproll 151 153 is inserted on the inserting hole of rotation stopping parts 163 165, and disposes tongue piece 166 downwards.And, with the 3rd embodiment in the same manner, make end that a back shaft 153 of rotation stopping parts 163 1 sides is installed and niproll 151 simultaneously oblique down, be inserted between a side the 157a of clutch shaft bearing portion and second 157b of bearing portion opening groove 162 below.Then, make back shaft 153 be level, an end of this back shaft 153 is supported by the U word slot part axle of a 157a of clutch shaft bearing portion, and the main body 164 of the axle rotation stopping parts 163 of its front is between the 157a of clutch shaft bearing portion and second 157b of bearing portion.And, tongue piece 166 is embedded in the opening groove 162.The other end axle of niproll 151 is supported on the opposing party's the 157a of clutch shaft bearing portion and second 157b of bearing portion.

Thus, the main body 164 of installation shaft rotation stopping parts 163, it can not be rotated relatively with respect to back shaft 153, and tongue piece 166 is embedded in the opening groove 162, so back shaft 153 can not be rotated with respect to second 157b of bearing portion, and fasten by means of a pair of fastening pawl 161, thereby can upwards not come off.Therefore, can make niproll 151 be independent of back shaft ground, be rotated with the posture of stipulating.

In all structures of the axle rotation stopping parts 163 of the axle rotation stopping parts 159 of the 3rd embodiment and the 4th embodiment, all be the simple structure that only above-mentioned parts 159,163 is embedded back shaft 153, needn't on back shaft, carry out the processing that is shaped, so manufacturing cost can not improve a lot.And, because niproll 151 and back shaft 153 are with respect to the assembling operation of bearing portion, an end parts of the back shaft 153 of rotation stopping parts 159,163 1 sides will be installed earlier embed second 157b of bearing portion, so can reach the good effect of assembly operation.In addition, the 157a of clutch shaft bearing portion also can be the slotted hole type, in this case, be inserted into back shaft 153 in the slotted hole after, be embedded on second 157b of bearing portion after axle rotation stopping parts 159,163 are embedded back shafts 153.

In addition, as shown in figure 13, when niproll 151 being installed on the inboard guide surface 152, from overlooking, near the end of width central part one side, supported obliquely in the both ends of the rotating shaft 153 of niproll 151 to direction of transfer downstream (arrow A direction).In Figure 13, with the central part of the width of transfer path 23 as center line B, and with single-point line expression.Niproll 151 is configured to, and its both sides are boundary's left-right symmetry shape with center line B on width, and, to the axis of the back shaft 153 of the niproll 151 of same direction tilted configuration by configured in parallel in basic parallel face with transfer path.Promptly, as shown in figure 13, the back shaft 153 that will be positioned at two niproll 151c, the 151d on center line B right side is configured to the upper right side tilt angle theta, and with respect to this, the back shaft 153 that will be positioned at two niproll 151a, the 151b in center line B left side is configured to the upper left side tilt angle theta.

In the image recording structure 1 that constitutes like this, instruction according to the image record, the paper P that is in the superiors among the paper P that is deposited in the paper feeding cassette 20 is advanced along with the rotation of paper feed roller 25, and its front end docks with separating hang plate 22, and by transfer path 23 channeling conducts.Paper P is by means of transfer path 23 U type turning from bottom to top, and its front end edge is connected on the contact site of driven roller 42 and niproll 151.Under the state of beginning paper supply and since driven roller 42 to paper sender (in Fig. 4 be counterclockwise) rotation in the opposite direction, so to the front end edge of the paper P of the direction house of correction transmission that intersects vertically with direction of transfer.Then, when driven roller 42 rotates along paper direction of transfer (being clockwise direction), then utilize the chucking power of helical spring 158 in Fig. 4, transmit paper P by driven roller 42 and niproll 151 clampings.

Because the back shaft 153 of niproll 151 is arranged to tilt with respect to the driving shaft of driven roller 42,, in the present embodiment, on four clip positions (point), carry out clamping so driven roller 42 is that point contacts with niproll 151.Therefore, and contact and the rear end of clamping paper P, and compare when once decontroling this clamp position,, also can weaken power to the unnecessary discharge paper of direction of transfer P rear end even have enough chucking powers between niproll 151 and the driven roller 42 by long line.

Utilize transfer path 23 to make paper P center-aligned and transmit, in the both sides of the center line B of transfer path 23 with left-right symmetry shape configuration niproll 151, interosculate, when the size of the width of paper P (is not for example represented with W1, W2 in Figure 12) not simultaneously, even this is of a size of out-of-spec size, because can be at the both sides of center line B left and right symmetrically clamping paper P, it is even that chucking power becomes on width, so can transmit paper P as the crow flies, and can not tilt to the direction of transfer downstream.In addition, at all events plant the paper of size, when its front end arrives clip position, can both carry out clamping with the active force of regulation.In other words, even paper size changes, because clip position can not depart from direction of transfer, so the transmission condition can not produce standard deviation.

As shown in figure 13, the end that is in described center line B side in back shaft 153 both ends of niproll 151 tilts to the direction of transfer downstream.In other words, owing to the paper P application of force that is transmitted to this niproll 151, make the dual-side (outside of width) of direction of transfer (arrow A direction) extension discharge, so the tension force that stretches to above-mentioned dual-side acts on the paper P from center line B side direction along paper P.Thus, can prevent near the center line B of paper P, to produce wrinkle or deflection, and can keep paper P flatly to be sent to record portion 24.

In the present embodiment, paper feeding cassette 20 is configured in record portion 7 belows, paper injection P from the below transmits by U type turning path, so compare when paper P being sent to record portion from the top, driven roller 42 and niproll 151 must have stronger active force to act on the niproll 151 with powerful clamping paper P.Therefore, in the image recording structure 1 of this strong chucking power mode, as mentioned above, can effectively prevent the unnecessary discharge in the rear end of paper P.

Driven roller 42 of the present invention is configured in the downside of transfer path, clamping paper P and niproll 151 is configured in upside, also be applicable to support chip portion 154 and bearing portion are arranged on the guided outside face 160 in the outside, and utilize helical spring 158 niproll 151 to be pushed the structure of the application of forces downwards.

Above-mentioned embodiment only is an example of the present invention, can carry out various distortion or improvement within the scope of the invention.For example, in second embodiment, can adopt the niproll of illustrated in the first embodiment shape.In the 3rd embodiment, can adopt the niproll of shape illustrated in first or second embodiment.In addition, the Bearning mechanism of illustrated niproll also can be used for first and second embodiments in the 3rd or the 4th embodiment.

Claims (33)

1. image recording structure that is used for document image on recording medium, comprising: image record portion is used for document image on recording medium; Transfer path is used for sending recording medium to image record portion; And driven roller and a plurality of niproll, be separately positioned on the described transfer path and the described recording medium of clamping and transmitting, it is characterized in that,

The axle of described a plurality of niprolls, the driving shaft along driven roller below described driven roller is arranged, and tilts towards the direction of transfer downstream with respect to the driving shaft of driven roller,

Described niproll and driven roller are positioned at the top at the position bottom of described driven roller periphery to the clip position of recording medium, and are positioned at the direction of transfer upstream side.

2. image recording structure as claimed in claim 1, wherein, each rotating shaft of described a plurality of niprolls near a side end of the width central part that intersects vertically with described transfer path direction of transfer, is configured to tilt to the direction of transfer downstream in its both ends.

3. image recording structure as claimed in claim 1 wherein, on the width of described transfer path, disposes described a plurality of niproll about the central part of its width symmetrically.

4. image recording structure as claimed in claim 1, wherein, the profile of described niproll is that the regulation zone that comprises clip position on the axis direction of niproll forms same diameter.

5. image recording structure as claimed in claim 1, wherein, on either party or two sides' the periphery, described at least clip position is formed by the rubber-like elasticity material in described driven roller and described niproll.

6. image recording structure as claimed in claim 3 wherein, is arranged at least two rollers in described a plurality of niprolls to tilt to same direction, and the axis of its rotating shaft is configured in the face parallel with described transfer path abreast.

7. image recording structure as claimed in claim 3, wherein, described recording medium is that central part with its width aligns with the central part of the width of described transfer path and transmits.

8. image recording structure as claimed in claim 6 wherein, to the described niproll of same direction tilted configuration and the clip position of described driven roller, is positioned on the same straight line that intersects vertically with direction of transfer and extend.

9. image recording structure as claimed in claim 1 wherein, transmits described recording medium via U type turning transfer path to described clip position from described clip position below.

10. image recording structure as claimed in claim 1 wherein, forms depressed part respectively on described niproll, and forms respectively the clamping part with described driven roller crimping respectively in the axial both sides of this depressed part.

11. image recording structure as claimed in claim 10 wherein, when near the rear end of clamping recording medium at least and when transmitting, carries out driving at intermittence with the unit transmitting range of regulation to described driven roller;

Each clamping part of described each niproll respectively with the separating distance of the direction of transfer of each clip position of driven roller crimping more than or equal to described unit transmitting range.

12. image recording structure as claimed in claim 10, wherein, each clamping part of described each niproll has identical diameter.

13. image recording structure as claimed in claim 10, wherein, the clip position of the clamping part of described niproll and described driven roller crimping, on direction of transfer, have upstream side clip position group and downstream clip position group, in upstream side clip position group, clip position is positioned on first straight line that intersects vertically with direction of transfer, and in the clip position group of downstream, clip position is positioned on second straight line that intersects vertically with direction of transfer.

14. image recording structure as claimed in claim 10 wherein, corresponding to multiple recording medium size to be transmitted, is configured in described each niproll near the two ends of width of various recording mediums.

15. image recording structure as claimed in claim 10 wherein, disposes described niproll with respect to the center left and right symmetrically of the width of transfer path.

16. image recording structure as claimed in claim 10 wherein, disposes each of described each niproll obliquely, makes the end of central side of its transfer path width be in the direction of transfer downstream.

17. image recording structure as claimed in claim 10, wherein, the transfer path of described driven roller and niproll upstream side is from this clip position leader record medium of following direction of the clip position of this driven roller and niproll.

18. image recording structure as claimed in claim 17, wherein, described transfer path makes recording medium U type turning from bottom to top and channeling conduct.

19. image recording structure as claimed in claim 10, wherein, described image record portion comprises and is used to spray ink and carries out the ink jet print head of image record.

20. image recording structure as claimed in claim 10 wherein, only is provided with a niproll on the axle of niproll.

21. image recording structure as claimed in claim 10, wherein, the depressed part of described niproll for the groove cylindraceous that axially intersects vertically of this niproll.

22. image recording structure as claimed in claim 10, wherein, the groove that the depressed part of described niproll forms for the axioversion to this niproll.

23. image recording structure as claimed in claim 1, wherein,

Comprise: back shaft is used for rotatably supporting described niproll; With the bearing portion that is used for the two ends of back shaft are supported, have the clutch shaft bearing portion and the second bearing portion, the outer peripheral face that this clutch shaft bearing portion is used for supporting described back shaft both ends is in the upstream side of recording medium direction of transfer and the sidepiece in downstream, this second bearing portion is used to support the both ends of described back shaft, so that it can not come off;

On at least one end of described back shaft, embed axle rotation stopping parts, and with this rotation stopping component limitations in the described second bearing portion.

24. image recording structure as claimed in claim 23, wherein, described axle rotation stopping parts are the shape that interference fit embeds described back shaft.

25. image recording structure as claimed in claim 23 wherein, is configured in a side near the niproll end face with clutch shaft bearing portion, clamping described clutch shaft bearing portion and the described second bearing portion is configured in a side away from the niproll end face;

The second bearing portion comprises a pair of fastening pawl that is used to fasten described axle rotation stopping parts.

26. image recording structure as claimed in claim 23, wherein, described clutch shaft bearing portion and the described second bearing portion are integrally formed on the guide member that constitutes described transfer path.

27. image recording structure as claimed in claim 23, wherein, described niproll and described axle rotation stopping parts are made of synthetic resin, and back shaft is made of metal.

28. image recording structure as claimed in claim 27, wherein, described axle rotation stopping parts are for having the material of high frictional property with respect to back shaft.

29. image recording structure as claimed in claim 23, wherein, described axle rotation stopping parts are the metal flat pattern with the inserting hole that can insert logical described back shaft;

Configuration is a plurality of on described inserting hole enters inboard circular protrusions, and described each projected front ends portion arrives the outer peripheral face of described back shaft, and interference fit and embed this back shaft.

30. image recording structure as claimed in claim 29, wherein, described axle rotation stopping parts are metal flat pattern, and have the tongue piece that embeds the opening groove in the described second bearing portion and stop described back shaft rotation.

31. image recording structure as claimed in claim 23, wherein, each back shaft of described a plurality of niprolls near a side end of the width central part that intersects vertically with described transfer path direction of transfer, is configured to tilt to the direction of transfer downstream in its both ends.

32. image recording structure as claimed in claim 31 wherein, on the width of described transfer path, disposes described a plurality of niproll about the central part left and right symmetrically of its width.

33. image recording structure as claimed in claim 1 wherein, also comprises paper feeding cassette and is used for and will be deposited in the paper feed that recording medium in the paper feeding cassette is sent to transfer path.

Images