CN101519001A - Sheet conveying device and image recording apparatus - Google Patents

Sheet conveying device and image recording apparatus Download PDF

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Publication number
CN101519001A
CN101519001A CNA2009100046659A CN200910004665A CN101519001A CN 101519001 A CN101519001 A CN 101519001A CN A2009100046659 A CNA2009100046659 A CN A2009100046659A CN 200910004665 A CN200910004665 A CN 200910004665A CN 101519001 A CN101519001 A CN 101519001A
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CN
China
Prior art keywords
supporting member
driven roller
pinch roll
place
recording medium
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CNA2009100046659A
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Chinese (zh)
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CN101519001B (en
Inventor
寺田宏平
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Brother Industries Ltd
Original Assignee
Brother Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to JP2008049721 priority Critical
Priority to JP2008050055 priority
Priority to JP2008-050055 priority
Priority to JP2008050055A priority patent/JP4518160B2/en
Priority to JP2008049721A priority patent/JP4577378B2/en
Priority to JP2008-049721 priority
Application filed by Brother Industries Ltd filed Critical Brother Industries Ltd
Publication of CN101519001A publication Critical patent/CN101519001A/en
Application granted granted Critical
Publication of CN101519001B publication Critical patent/CN101519001B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Abstract

The invention provides a sheet conveying device and image recording apparatus. A second support member supports a first support member so that the first support member is movable between a predetermined first position and a second position at an upstream side of the first position in a conveying direction of a recording medium. The first support member is moved to the first position during conveyance of the recording medium by a first conveying section. The first support-member is moved to the second position during non-conveyance of the recording medium by the first conveying section.

Description

Sheet material conveyor and image recorder
The cross reference of related application
The application requires the priority of Japanese patent application No.2008-049721 that submitted on February 29th, 2008 and the Japanese patent application No.2008-050055 that submitted on February 29th, 2008.The full content of described priority application is incorporated herein by reference.
Technical field
The present invention relates to a kind of sheet material conveyor of carrying sheet-shaped recording medium.More specifically, the present invention relates to a kind of sheet material conveyor and a kind of image recorder that is provided with this sheet material conveyor, this sheet material conveyor is configured to utilize the supply unit that comprises driven roller and be pressed in the driven voller on this driven roller to come conveying recording medium.
Background technology
Traditionally, the ink jet type image recorder is provided with the sheet material conveyor of carrying recording sheet towards platen.This sheet material conveyor comprises and is arranged in a pair of conveying roller that platen locates along the upstream side of throughput direction (hereinafter referred is " upstream side ") and is arranged in a pair of outlet roller that platen is located along the downstream (hereinafter referred is " downstream ") of throughput direction.
When image is recorded in the image recorder, drive this off and on to conveying roller, be used for carrying recording sheet off and on predetermined length.During the dwell time of this intermittent delivery, record head slides along the direction vertical with the throughput direction of recording sheet and moves, and the nozzle from record head sprays ink simultaneously, thereby ink adheres to this recording sheet.Repeat this operation for each intermittent delivery, thereby image is recorded on the recording sheet continuously with predetermined length.Notice that the controller (not shown) controls this to conveying roller and this rotation to outlet roller, thereby carry out above-mentioned intermittent delivery.
This comprises driven roller and driven voller to conveying roller.Driven roller receives from the revolving force of transmission such as motor, and is driven in rotation.Driven voller by promotions such as disc springs so that be pressed on the driven roller, and driven the rotation.
Summary of the invention
The purpose of this invention is to provide a kind of sheet material conveyor that can improve the quality that is recorded in the image on the recording medium, and a kind of image recorder that is provided with this sheet material conveyor is provided.
Another object of the present invention provides a kind of sheet material conveyor that can prevent such as the transmission failure of the paperboard and the conveying of tilting, and a kind of image recorder that is provided with this sheet material conveyor is provided.
For realizing above-mentioned and other purpose, one aspect of the present invention provides a kind of sheet material conveyor, and this sheet material conveyor is transported to support member with sheet-shaped recording medium, and during the image record, recording medium is placed on this support member.This sheet material conveyor comprises first delivery section, rotating supporting member, first ways, first supporting member, pushing member and second supporting member.First delivery section has driven roller and faces the driven voller of arranging with this driven roller.First delivery section is carried recording medium towards this support member.Rotating supporting member rotatably supports driven voller.First ways is set to rotating supporting member and outstanding towards this support member.First supporting member supports rotating supporting member movably, makes driven voller to move and to move away driven roller towards driven roller.The pushing member is arranged between first supporting member and the rotating supporting member, and towards moving driven voller of driven roller thruster and rotating supporting member.Second support member support, first supporting member, make win supporting member can predetermined primary importance with in this primary importance along mobile between the second place at the upstream side place of the throughput direction of recording medium.During recording medium was carried by first delivery section, first supporting member moved to primary importance.By during the non-conveying of first delivery section, first supporting member moves to the second place at recording medium.
In another aspect of this invention, provide the predetermined throughput direction in a kind of edge to carry the sheet material conveyor of sheet-shaped recording medium.This sheet material conveyor comprises first delivery section, rotating supporting member, ways, first supporting member, align member, pushing member and second supporting member.First delivery section has driven roller and driven voller, and this driven voller and this driven roller rotate in the face of the ground layout and when being configured on being pressed in driven roller drivenly.Rotating supporting member rotatably supports driven voller.Ways is set to rotating supporting member integratedly.Ways leader record medium makes this recording medium by the clamp-press part between driven roller and the driven voller.First supporting member supports rotating supporting member movably, makes driven voller and to move away driven roller towards driven roller.Align member is set to first supporting member integratedly.Align member is with respect to the axle of throughput direction location driven voller.The pushing member is arranged between first supporting member and the rotating supporting member, and towards the moving rotating supporting member of driven roller thruster.Second support member support, first supporting member, make win supporting member can predetermined primary importance with in this primary importance along mobile between the second place at the upstream side place of the throughput direction of recording medium.During recording medium was carried by first delivery section, first supporting member moved to primary importance.By during the non-conveying of first delivery section, first supporting member moves to the second place at recording medium.
In another aspect of this invention, provide a kind of image recorder that comprises sheet material conveyor and record head.This sheet material conveyor is transported to support member with sheet-shaped recording medium, and during the image record, recording medium is placed on this support member.This sheet material conveyor comprises first delivery section, rotating supporting member, first ways, first supporting member, pushing member and second supporting member.First delivery section has driven roller and faces the driven voller of arranging with this driven roller.First delivery section is carried recording medium towards this support member.Rotating supporting member rotatably supports driven voller.First ways is set to rotating supporting member and outstanding towards this support member.First supporting member supports rotating supporting member movably, makes driven voller to move and to move away driven roller towards driven roller.The pushing member is arranged between first supporting member and the rotating supporting member, and towards moving driven voller of driven roller thruster and rotating supporting member.Second support member support, first supporting member, make win supporting member can predetermined primary importance with in this primary importance along mobile between the second place at the upstream side place of the throughput direction of recording medium.During recording medium was carried by first delivery section, first supporting member moved to primary importance.By during the non-conveying of first delivery section, first supporting member moves to the second place at recording medium.Record head is by ink jet recording method carries out image record on the recording medium of being carried by this sheet material conveyor.
In still another aspect of the invention, provide a kind of image recorder that comprises sheet material delivery section and record head.This sheet material conveyor is carried sheet-shaped recording medium along predetermined throughput direction.Sheet material conveyor comprises first delivery section, rotating supporting member, ways, first supporting member, align member, pushing member and second supporting member.First delivery section has driven roller and driven voller, and this driven voller and this driven roller rotate in the face of the ground layout and when being configured on being pressed in driven roller drivenly.Rotating supporting member rotatably supports driven voller.Ways is set to rotating supporting member integratedly.Ways leader record medium makes this recording medium by the clamp-press part between driven roller and the driven voller.First supporting member supports rotating supporting member movably, makes driven voller to move and to move away driven roller towards driven roller.Align member is set to first supporting member integratedly.Align member is with respect to the axle of throughput direction location driven voller.The pushing member is arranged between first supporting member and the rotating supporting member, and towards the moving rotating supporting member of driven roller thruster.Second support member support, first supporting member, make win supporting member can predetermined primary importance with in this primary importance along mobile between the second place at the upstream side place of the throughput direction of recording medium.During recording medium was carried by first delivery section, first supporting member moved to primary importance.By during the non-conveying of first delivery section, first supporting member moves to the second place at recording medium.Record head is by ink jet recording method carries out image record on the recording medium of being carried by this sheet material conveyor.
Description of drawings
In the accompanying drawings:
Fig. 1 is the perspective view of demonstration according to the external form of the multifunctional equipment of the embodiment of the invention;
Fig. 2 is the schematic sectional elevation that schematically shows the internal structure of the multifunctional equipment shown in Fig. 1;
Fig. 3 is the partial cross sectional view that shows a pair of conveying roller and peripheral structure thereof;
Fig. 4 is the plane that shows the main structure of printer portion;
Fig. 5 is the perspective view that shows by the state of retainer support member support pinch roll retainer;
Fig. 6 is the decomposition diagram that shows retainer supporting member and pinch roll retainer;
Fig. 7 is the enlarged perspective of support portion that shows the rotating shaft of pinch roll;
Fig. 8 A and Fig. 8 B are the local sectional elevations that amplifies, be used to illustrate the moving range of pinch roll retainer, wherein Fig. 8 A shows that the pinch roll retainer is positioned at the state that punctured position (second place) is located, and Fig. 8 B shows that the pinch roll retainer is positioned at the state that transfer position (primary importance) is located;
Fig. 9 A and Fig. 9 B show this sectional elevation to conveying roller when carrying recording sheet, and wherein Fig. 9 A shows the state that clamps ground transporting thin recording sheet, and Fig. 9 B shows the state that thick recording sheet is carried on ground that clamps;
Figure 10 is a partial enlarged view, is used to illustrate the moving range of pinch roll retainer;
Figure 11 is presented at the schematic diagram of center O as the cross section of driven roller and pinch roll in the XY coordinate of initial point;
Figure 12 be presented at driven roller and pinch roll in the XY coordinate of Figure 11 clamp the schematic diagram of state of the medium of holding the record;
Figure 13 A is the schematic diagram of demonstration according to the structure of the sheet material conveyor of comparative example to Figure 13 C; And
Figure 14 A and Figure 14 B are the zoomed-in views that shows according to a pair of conveying roller in the sheet material conveyor of comparative example.
The specific embodiment
Sheet material conveyor and image recorder according to the embodiment of the invention are described with reference to the accompanying drawings.It should be noted that embodiment hereinafter described embodies example of the present invention, and it is evident that to one skilled in the art under the situation that does not depart from spirit of the present invention, can make various changes and modifications therein.
The total structure of<multifunctional equipment 1 〉
As shown in fig. 1, multifunctional equipment 1 integral body according to the present invention is provided with the printer portion 2 (example of image recorder of the present invention) of ink mist recording type at the bottom place that is arranged on multifunctional equipment 1 and the scanner portion 3 that is arranged on the upside place of printer portion 2.Multifunctional equipment 1 has printer function, scanner functions, duplicator function, facsimile function etc.Sheet material conveyor of the present invention is embodied as the mechanism that the image record position in printer portion 2 is carried recording sheet (recording medium).In the present embodiment, the multifunctional equipment 1 with multiple function is described.Yet, for example only comprise that the so-called printer of printer portion 2 also can be embodied as image recorder of the present invention.
Printer function is based on the function of the printer portion 2 on recording sheet with image and text entry from computer (not shown) image transmitted data and text data.Scanner functions is to be sent to the function of the computer that links to each other with scanner portion 3 in wired or wireless mode by the view data of the original of scanner portion 3 scanning.The view data that is scanned can be sent to such as the various storage mediums of storage card and be stored in wherein.The duplicator function is will be by the function of the printer portion 2 of Imagery Data Recording on recording sheet of scanner portion 3 scanning.Facsimile function is via the function of transmission such as telephone wire by the view data of scanner portion 3 scannings.The facsimile data that is received is recorded on the recording sheet by printer portion 2.
As shown in fig. 1, the external form of multifunctional equipment 1 forms width and the degree of depth greater than the big broadening of height and the rectangular parallelepiped protrusion part of low type.The printer portion 2 that is positioned at the place, bottom of multifunctional equipment 1 comprises the shell 10 of the framework that constitutes printer portion 2.Opening 12 is formed in the front surface of shell 10.In opening 12 inside, sheet material supplies trays 20 and sheet material output panel 21 be arranged in upper and lower two-layer in, wherein sheet material supplies trays 20 is held recording sheet, and image record recording sheet thereon is output on the sheet material output panel 21.Refill unit is arranged in the shell 10, and the ink cartridge of storage ink is installed in this refill unit separably.Notice that refill unit and ink cartridge are contained in the shell 10, and do not have shown in Figure 1.
The guidance panel 9 that is used for printer operation portion 2 and scanner portion 3 is arranged on the front upper part of multifunctional equipment 1.Guidance panel 9 comprises various action buttons and the appropriate LCDs of arranging.Multifunctional equipment 1 is according to instruction (command signal) operation from guidance panel 9 inputs.If multifunctional equipment 1 is connected to outer computer, then multifunctional equipment 1 is also according to operating via the instruction (command signal) of printer driver or scanner drive transmission from computer.
Scanner portion 3 comprises the original scanner 5 as so-called flat bed scanner (FBS).Original lid 7 hinges via equipment rear side place are set to original scanner 5, thereby original lid 7 can open and close.Contact glass is arranged on the place, top of original scanner 5.It is on glass to be placed on contact as the original of sweep object.CIS (contact-type image sensor) is arranged on below the contact glass.CIS moves by this way, and promptly the depth direction of multifunctional equipment 1 is a main scanning direction, and CIS can reciprocally move along the width of multifunctional equipment 1.In the present invention, scanner portion 3 energy any configuration, not directly related with the present invention.Therefore, omit detailed description herein for scanner portion 3.
The total structure of<printer portion 2 〉
Printer portion 2 is recorded in image on the recording sheet according to ink jet recording method.The printer portion 2 of this embodiment is by using the ink of four kinds of colors, and promptly the ink of every kind of color in blue-green (C), magenta (M), yellow (Y) and the black (Bk) is recorded in colour or monochrome image on the recording sheet.As shown in Figure 2, printer portion 2 comprises sheet feeding device 13, conveying device 14 and image recording unit 24.
Sheet material supplies trays 20 is arranged on the place, bottom of printer portion 2.Sheet material supplies trays 20 is held many recording sheets in stacked mode.Be layered in the sheet material supplies trays 20 recording sheet by sheet feeding device 13 every next sheet materials pick up and be fed to sheet material transport path 23.Separation swash plate 22 is arranged on the rear side (right side among Fig. 2) of sheet material supplies trays 20 and locates.Separate the rear side inclination of swash plate 22 towards equipment.Separating swash plate 22 is used to separate from the recording sheet of sheet material supplies trays 20 feedings and with the upwards guiding of a sheet material.Sheet material transport path 23 self-separation swash plates 22 form towards upside.When observing in the cross section, sheet material transport path 23 forms the roughly U-shaped shape of side direction rotation.More specifically, sheet material transport path 23 extends upward from separating swash plate 22, and bending is left extended towards the front side with the rear side from multifunctional equipment 1, by image recording unit 24, and guiding sheet material output panel 21.Therefore, the recording sheet that is contained in the sheet material supplies trays 20 is directed rotating to make U-shaped from the lower to the upper along sheet material transport path 23, and arrives image recording unit 24.Then, after by image recording unit 24 carries out image record, recording sheet is outputed on the sheet material output panel 21.
As shown in Figure 2, image recording unit 24 is arranged on the sheet material transport path 23.The carriage 31 that image recording unit 24 comprises ink jet print head 30 (hereinafter referred for " record head ") and supports record head 30 and can move back and forth along main scanning direction (perpendicular to the direction of the drawing surface of Fig. 2).Provide the ink of every kind of color blue-green (C), magenta (M), yellow (Y) and the black (Bk) via the ink cartridge of ink barrel 33 (see figure 4)s in being arranged on printer portion 2 to record head 30, and record head 30 sprays the ink of every kind of color optionally as small ink droplet.Ink droplet is optionally ejection from record head 30 when carriage 31 moves back and forth, thus can be on the recording sheet of carrying along platen 34 the carries out image record.
As shown in Figure 4, pair of guide rails 43 and 44 is arranged in the printer portion 2.Guide rail 43 extends along the direction (left and right directions in Fig. 4) vertical with the throughput direction (above-below direction among Fig. 4) of recording sheet with 44.This is arranged on the sheet material transport path 23 with the preset space length along the throughput direction of recording sheet therebetween guide rail 43 and 44.Carriage 31 is arranged in such a way, and promptly carriage 31 is across guide rail 43 and 44.Carriage 31 can move along the horizontal direction vertical with the throughput direction of recording sheet.Guide rail 43 is arranged in the upstream side (hereinafter referred is " upstream side ") of the throughput direction of recording sheet and locates.Guide rail 43 is plate type members, and its length along the width of sheet material transport path 23 is longer than the reciprocal scope of carriage 31.Spigot surface 43A is that guide rail 43 is at the upper surface of locating along the downstream (hereinafter referred is " downstream ") of throughput direction.Spigot surface 43A is the upstream side of Support bracket 31 slidably.
Guide rail 44 is plate type members, and its length along the width of sheet material transport path 23 is approximate identical with guide rail 43.Guide rail 44 has into the upstream side edge part 45 that approximate right angle is bent upwards.Spigot surface 44A is the upper surface of guide rail 44 at the place, downstream.Spigot surface 44A is the downstream side of Support bracket 31 slidably.Carriage 31 utilizes (not shown) such as roller to clamp edge part 45.Utilize this configuration, carriage 31 is supported on the spigot surface 44A of the spigot surface 43A of guide rail 43 and guide rail 44 slidably.With the edge part 45 of guide rail 44 as a reference, carriage 31 can move back and forth along the horizontal direction vertical with the throughput direction of recording sheet.
Leather belt driving mechanism 46 is arranged on the upper surface of guide rail 44 along guide rail 44.Leather belt driving mechanism 46 comprises driving pulley 35, driven pulley 36 and synchronous belt 32.Driving pulley 35 and driven pulley 36 are separately positioned near the two ends of sheet material transport path 23 broad ways.Synchronous belt 32 is the endless belts that have tooth at the place, inboard, and forms ring around driving pulley 35 and driven pulley 36.The axle of driving pulley 35 is connected to the rotating shaft of motor (not shown).This motor is to the axle output drive strength of driving pulley 35, and this driving force makes driving pulley 35 rotations, thus synchronous belt 32 shuttling movements.Because carriage 31 is connected to synchronous belt 32, so based on the operation of leather belt driving mechanism 46, carriage 31 serves as with reference to moving back and forth along guide rail 43 and 44 with edge part 45.In addition, because record head 30 is installed on the carriage 31, so record head 30 can move back and forth along the width as the sheet material transport path 23 of main scanning direction.
To as shown in Fig. 4, platen 34 is arranged on the downside place of sheet material transport path 23 as Fig. 2, and arranges in the face of ground with record head 30.Platen 34 comprises a plurality of ribs of erectting straight up from its base plate 94.Rib 94 is narrow plate type members, and each rib extends along the throughput direction (above-below direction among Fig. 4) of recording sheet.Rib 94 is arranged on a plurality of positions along the width (direction vertical with throughput direction) of equipment with therebetween predetermined space.Rib 94 extends to the upstream side of platen 34.In Fig. 4, rib 94 is formed in the approximate whole zone of upper surface of platen 34.Yet for example rib 94 can only be formed on the side place, upstream of platen 34.
The end face of platen 34, promptly the surface that is formed by the top of a plurality of ribs 94 is as the supporting surface of recording sheet.Be transported to the top braces of the recording sheet of platen 34 by a plurality of ribs 94.The end face of platen 34 (supporting surface) flatly forms.Therefore, the recording sheet that is transported to platen 34 flatly supports.Platen 34 be arranged on recording sheet on the central part of reciprocal scope of carriage 31 of process.The width of the wideest recording sheet that the width specific energy of platen 34 is carried is enough big, thereby the two ends of recording sheet are always passed through on platen.
As shown in Figure 3, inclined-plane 96 is formed on upstream side 95 places of each rib 94.Inclined-plane 96 is downward-sloping towards upstream side from the top of rib 94, and wherein recording sheet is supported on this top.The leading edge that inclined-plane 96 is used for being transported to the recording sheet of platen 34 leads smoothly towards the end face of platen 34.
As shown in Figure 2, conveying device 14 is arranged on the sheet material transport path 23.Conveying device 14 comprises a pair of conveying roller 54 and a pair of outlet roller 55.This is arranged in the upstream side place of image recording unit 24 to conveying roller 54.This is arranged in this to place, downstream of conveying roller 54 to outlet roller 55, and also in the downstream of image recording unit 24.Fig. 3 has shown this structure to conveying roller 54 and other parts with the cross section.Notice omitted image recording unit 24, shell 10 among Fig. 3, this is to outlet roller 55 etc.
This comprises driven roller 47 and faces the pinch roll of arranging 48 with driven roller 47 conveying roller 54.In the present embodiment, pinch roll 48 is arranged in the downside place of driven roller 47.As shown in Figure 3, pinch roll 48 rotatably supports by pinch roll retainer 56 and auxiliary retainer 110.Hereinafter will the supporting mechanism of pinch roll 48 be described in more detail.In the present embodiment, pinch roll 48 is supported for and makes pinch roll 48 flexibly be pressed on the driven roller 47 with predetermined motive force.Therefore, pinch roll 48 is squeezed on the driven roller 47.When recording sheet entered clamp-press part between driven roller 47 and the pinch roll 48, pinch roll 48 shrank the amounts of the thickness that equals recording sheet downwards, and with driven roller 47 sheet material of holding the record clampingly.Utilize this configuration, the revolving force of driven roller 47 is delivered to recording sheet reliably.Recording sheet is carried towards platen 34 when keeping clampingly by driven roller 47 and pinch roll 48.
In the present embodiment, pinch roll retainer 56 supports by retainer supporting member 57, and this retainer supporting member 57 is attached to the inner frame of the shell 10 of constitution equipment, thereby pinch roll retainer 56 can move along the throughput direction of recording sheet.By adopting the supporting mechanism of this rolling movement, when the leading edge of recording sheet entered this to the clamp-press part of conveying roller 54, pinch roll retainer 56 moved to the transfer position (primary importance) that is positioned at the place, downstream shown in Fig. 8 B from the punctured position (second place) that is positioned at the upstream side shown in Fig. 8 A with pinch roll 48.In addition, when the trailing edge of recording sheet when this clamp-press part to conveying roller 54 separates, pinch roll retainer 56 moves to the punctured position that is positioned at the upstream side place from the transfer position that is positioned at the downstream with pinch roll 48.Notice and will be hereinafter the mechanism of the rolling movement of the supporting mechanism of structure, pinch roll retainer 56 and the pinch roll retainer 56 of retainer supporting member 57 and pinch roll retainer 56 and pinch roll retainer 56 be explained in more detail.
In the present embodiment, driven roller 47 and pinch roll 48 are arranged by this way, be that clamp-press part between driven roller 47 and the pinch roll 48 is positioned at the more position of top than the end face of platen 34, thereby this carry this recording sheet from oblique upside to conveying roller 54 can be on the end face that recording sheet is pressed in platen 34 time.In addition, pinch roll 48 is positioned at the upstream side place of driven roller 47, and is irrelevant with the scrolling position of the pinch roll retainer 56 that will describe hereinafter.
This comprises driven roller 49 and serrated roller 50 to outlet roller 55.Serrated roller 50 is arranged on the top of driven roller 49 and is provided with in the face of ground with driven roller 49.Serrated roller 50 is pressed on the driven roller 49.The recording sheet of record has been carried out in driven roller 49 and serrated roller 50 clampings thereon, and recording sheet is carried towards downstream more.Similar to pinch roll 48, serrated roller 50 is promoted towards driven roller 49, thereby serrated roller 50 can be pressed on the driven roller 49.Yet, because forming pressure with the recording sheet of having carried out record thereon, serrated roller 50 contacts, so the roller of serrated roller 50 surface forms similar castellated shape with concavity and convexity, can not reduce the quality that is recorded in the image on the recording sheet thus.
Belt pulley is connected to driven roller 47 end in axial direction.The driving force of motor is transferred to this belt pulley, thereby makes driven roller 47 rotations.And, this driving force is transmitted via the above-mentioned belt pulley of transmission mechanism (not shown) from driven roller 47, thereby made driven roller 49 rotations.Therefore, driven roller 47 and 49 each rotation are able to synchronously.In addition, driven roller 47 is identical size with 49 each external diameter.Therefore, each roller is with identical peripheral speed rotation.
In the present embodiment, the rotary encoder (not shown) of the position of rotation of driven roller 47 and the revolution end by being connected to driven roller 47 is monitored.Control the rotation of said motor based on the detection signal of this rotary encoder, thereby allow driven roller 47 and driven roller 49 to rotate continuously or off and on.Utilize this operation, can carry recording sheet continuously, perhaps can carry recording sheet off and on predetermined line feed width as required.Notice that rotary encoder can comprise the encoder dish that for example is set to driven roller 47 and face the photo interrupter that this encoder dish is provided with.
When recording sheet was transported to platen 34, this off and on carried recording sheet with predetermined line feed width to conveying roller 54 on platen 34 and along platen 34.When carrying out line feed, move to record head 30 scannings, thereby from the front edge side carries out image record of recording sheet.The front edge side that this has kept carrying out the recording sheet of image record thereon clampingly to the driven roller 49 and the serrated roller 50 of outlet roller 55.In other words, hold the record the clampingly front edge side of sheet material of driven roller 49 and serrated roller 50, the trailing edge side of sheet material and driven roller 47 and pinch roll 48 are held the record clampingly.
When further conveying recording sheet, the trailing edge of recording sheet separates from this clamp-press part to conveying roller 54, and discharges from the clamping of driven rolls 47 and pinch roll 48.That is to say that recording sheet only keeps outlet roller 55 clampingly by this, and carry off and on predetermined line feed width.On to the presumptive area of recording sheet, after the carries out image record, drive this driven roller 49 so that it rotates continuously.Utilize this operation, will output on the sheet material output panel 21 by the recording sheet that driven roller 49 and serrated roller 50 keep clampingly.Notice, when the trailing edge of recording sheet discharged from the clamping of driven rolls 47 and pinch roll 48, pinch roll retainer 56 moved to the punctured position (second place) that is positioned at the upstream side place shown in Fig. 8 A from the transfer position (primary importance) that is positioned at the downstream shown in Fig. 8 B.
The structure of the supporting mechanism of<pinch roll 48 〉
Hereinafter, the supporting mechanism of pinch roll 48 will be described in detail.The supporting mechanism of pinch roll 48 comprises rotating shaft 65, retainer supporting member 57, rolling bearing (or mobile support unit) 80, pinch roll retainer 56, auxiliary retainer 110, disc spring 61 and the pinch roll 48 that rotatably supports pinch roll 48.
<retainer supporting member 57 〉
As shown in Fig. 5 and Fig. 6, retainer supporting member 57 forms elongated shape.Retainer supporting member 57 is made by the synthetic resin that with polystyrene (PS) resin is representative.Retainer supporting member 57 is used as pedestal, its back-up roller dynamic bearing 80, retainer supporting member 57, auxiliary retainer 110, disc spring 61, rotating shaft 65 and pinch roll 48.In printer portion 2, promptly the longitudinal direction 131 of retainer supporting member 57 is corresponding to the axial direction of driven roller 47 with such arranged in orientation for retainer supporting member 57, and the shorter direction 132 of retainer supporting member 57 is corresponding to the throughput direction of recording sheet.More specifically, retainer supporting member 57 is with such arranged in orientation, promptly is positioned at along the side 133 at a side place of shorter direction 132 side for the downstream, and is positioned at side 134 along the opposite side place of shorter direction 132 towards upstream side.In the present embodiment, four retainer supporting members 57 are along the axial direction alinement of driven roller 47.Each of retainer supporting member 57 supports the member of pinch roll retainer 56, auxiliary retainer 110, rotating shaft 65, pinch roll 48 etc.Hereinafter, for simplicity, will be described one in the retainer supporting member 57 and each member of supporting by this retainer supporting member 57.
Retainer supporting member 57 is fixed to the framework that constitutes printer portion 2.More specifically, two ratchets 136 with outstanding shape that are set to the side 134 of retainer supporting member 57 are assemblied in the engagement grooves (not shown) of framework, thereby can position retainer supporting member 57.Attachment seat 138 is set to the lower end of side 133, and this attachment seat 138 is extended towards the downstream.Under the state of retainer supporting member 57 with respect to the framework location, screw is driven in the through hole 137 that is formed in the attachment seat 138, make attachment seat 138 be fixed to framework by this screw.Therefore, retainer supporting member 57 is fixed to framework.
Recess 139 is formed on the upside of retainer supporting member 57.Pinch roll retainer 56 is supported on the bottom surface 69 of recess 139 via rolling bearing 80, thereby pinch roll retainer 56 can move on bottom surface 69.Notice owing to the mechanism that is used for back-up roller dynamic bearing 80 and pinch roll retainer 56, so the true form of the bottom surface 69 of recess 139 is formed with concavity and convexity.Yet, in this manual,, " bottom surface 69 of recess 139 " is defined as the surface in the recess 139 on the plane that when from top observation, appears at retainer supporting member 57 if there is not explanation in addition.
Engagement recesses 67 is formed in the two ends of bottom surface 69 of recess 139.This engagement recesses 67 engages with the prodger 68 (will be described below) that is set to pinch roll retainer 56.Engagement recesses 67 is longer than the length of prodger 68 along shorter direction 132 fully along the length of the shorter direction 132 of retainer supporting member 57.As hereinafter describing,, make that prodger 68 engaged with engagement recesses 67 when pinch roll retainer 56 can move along shorter direction 132 when pinch roll retainer 56 supports by retainer supporting member 57.At this moment, the moving range of pinch roll retainer 56 is restricted to the scope that prodger 68 wherein can move in engagement recesses 67.
<rolling bearing (or mobile support unit) 80 〉
Rolling bearing 80 comprises concave shaped portion 141 and roller 143.Concave shaped portion 141 is formed in the bottom surface 69 of recess 139.Roller 143 is contained in the concave shaped portion 141.Four concave shaped portion 141 are formed in the bottom surface of recess 139.Roller 143 is made cylindrical shape by resin with good sliding properties etc., and is contained in separately in of concave shaped portion 141.More specifically, each roller 143 is contained in the concave shaped portion 141 with such orientation, and promptly the axle of roller 143 is corresponding to the longitudinal direction 131 of retainer supporting member 57.The degree of depth of concave shaped portion 141 is approximately equal to the radius of roller 143.Therefore, under roller 143 is contained in state in the concave shaped portion 141,69 exposures of the roller surface of roller 143 from the bottom surface.In addition, concave shaped portion 141 is longer than the diameter of roller 143 at least along the length of shorter direction 132.Because concave shaped portion 141 has these sizes, so when under roller 143 is contained in state in the concave shaped portion 141, when pinch roll retainer 56 being placed on the bottom surface 69 of recess 139, pinch roll retainer 56 can move along the bottom surface 69 of recess 139.
Notice that present embodiment uses such structure, wherein concave shaped portion 141 is formed in the bottom surface of retainer supporting member 57, and roller 143 is contained in the concave shaped portion 141, and as the rolling bearing 80 that supports pinch roll retainer 56, thereby pinch roll retainer 56 can move.Yet, can use another structure, for example, the concave shaped portion similar to concave shaped portion 141 is formed in the bottom surface of pinch roll retainer 56, and roller 143 is contained between the bottom surface 69 of these concave shaped portion and retainer supporting member 57.Can use another structure, promptly replace above-mentioned rolling bearing 80, known roller bearing or ball bearing are arranged between the bottom surface of the bottom surface 69 of retainer supporting member 57 and pinch roll retainer 56.In a word, being used for supporting pinch roll retainer 56 makes pinch roll retainer 56 to be not limited to above-mentioned rolling bearing 80 in the mechanism that retainer supporting member 57 moves.As long as the frictional force that produces is enough little, then can use mobile supporting mechanism with any configuration between retainer supporting member 57 and pinch roll retainer 56.
<pinch roll retainer 56 〉
As shown in Fig. 5 and Fig. 6, similar to retainer supporting member 57, pinch roll retainer 56 forms elongated shape.Pinch roll retainer 56 is by making such as the synthetic resin of polyacetal resin (POM).In the present embodiment, the auxiliary retainer 110 that will be described below, disc spring 61, compress (driven) roller 48 and rotating shaft 65 is installed to pinch roll retainer 56 to form an assembly.This assembly is supported in the recess 139 of retainer supporting member 57.
Pinch roll retainer 56 is contained in the recess 139 of retainer supporting member 57.More specifically, pinch roll retainer 56 with such arranged in orientation in recess 139, be the axial direction of the longitudinal direction 131 of pinch roll retainer 56, and the shorter direction 132 of pinch roll retainer 56 is corresponding to the throughput direction of recording sheet corresponding to driven roller 47.
The auxiliary retainer that will be described below 110 utilizes the disc spring 61 that inserts between auxiliary retainer 110 and the pinch roll retainer 56 to be supported on the upside place (that is the side of facing with driven roller 47) of pinch roll retainer 56.
Otch 76 is respectively formed at pinch roll retainer 56 along the longitudinal direction in 131 the two ends.In plane, each of otch 76 basically forms rectangular shape.The support arm 111 of the auxiliary retainer 110 that will be described below inserts in the otch 76.Hook rib 70 is arranged on the both sides place of each otch 76 along shorter direction 132, thereby when support arm 111 inserted, the hook 113 of support arm 111 was hooked on the hook rib 70 and (engages with hook rib 70).
Two spring container cavities 62 are formed in the pinch roll retainer 56.Spring container cavity 62 contiguous otch 76 and the otch separately in otch 76 are provided with at 131 place, inboard along the longitudinal direction.Disc spring 61 is contained in the spring container cavity 62.Utilize this configuration, disc spring 61 is positioned in the pinch roll retainer 56.Each of disc spring 61 is used as so-called compression spring, and has the spring length and the elastic force that can move the rotating shaft 65 of pinch roll 48 towards driven roller 47 thrusters.Notice, replace disc spring 61, the elastic component such as leaf spring and rubber can be used as thrust unit.
Chamber separately that positioning rib 77 is arranged in the spring container cavity 62 is located 131 inboard along the longitudinal direction.Groove 78 is formed in the upper end of each positioning rib 77.Each of positioning rib 77 is erect from the upper surface of pinch roll retainer 56.In side view, groove 78 basically forms the U-shaped shape, thereby groove 78 is vertically cut the positioning rib 77 dearly from the upper end of positioning rib 77.Positioning rib 77 is used for along shorter direction 132 location pinch rolls 48.More specifically, under the state that the auxiliary retainer 110 that will describe hereinafter is installed on the pinch roll retainer 56 and the rotating shaft 65 of pinch roll 48 supports by auxiliary retainer 110, by coming along shorter direction 132 position rotating axles 65 (see figure 7)s in the groove 78 that rotating shaft 65 is inserted positioning ribs 77.Rotating shaft 65 is determined by the size of groove 78 and the size of rotating shaft 65 by the positioning accuracy of positioning rib 77.
The bottom surface that prodger 83 is arranged on pinch roll retainer 56 is 131 center along the longitudinal direction.Prodger 83 is inserted in engagement grooves 84 (see figure 6)s in the bottom surface 69 of the recess 139 that is formed on retainer supporting member 57 and with this engagement grooves 84 and is engaged.Prodger 83 forms from the outstanding downwards narrow width shape in the bottom surface of pinch roll retainer 56.Prodger 83 and engagement grooves 84 are formed on shorter direction 132 and are elongated shape.When prodger 83 was inserted in the engagement grooves 84, pinch roll retainer 56 was positioned in the retainer supporting member 57 with respect to longitudinal direction 131.And, the moving range of pinch roll retainer 56 is limited to shorter direction 132, the i.e. throughput direction of recording sheet.
First guiding rib 75 is set to the side 74 that is positioned at the place, downstream of pinch roll retainer 56.First guiding rib 75 is outstanding along the direction that is basically perpendicular to side 74.More specifically, as shown in Figure 5, first guiding rib 75 is set to side 74, thereby first guiding rib 75 is outstanding towards the platen 34 at the place, downstream that is arranged on pinch roll retainer 56.First guiding rib 75 is integrally formed with pinch roll retainer 56.In addition, first guiding rib 75 is along the axial direction of pinch roll 48, and promptly the longitudinal direction of pinch roll retainer 56 is arranged on a plurality of positions.Particularly, for side 74 along the longitudinal direction each end in 131 the two ends one first guiding rib 75 is set.
The upper surface of first guiding rib 75 is as spigot surface, and when recording sheet was transported to first guiding rib 75, described spigot surface was towards the leading edge of platen 34 these recording sheets of guiding.The upper surface of first guiding rib 75 is smooth, and approximately when pinch roll retainer 56 is positioned at the primary importance place is in identical height with the upper surface of platen 34.Notice that when pinch roll retainer 56 was in position (optional position from primary importance to the second place) except that primary importance, first guiding rib 75 was downward-sloping towards the upper surface of platen 34.
<auxiliary retainer 110 〉
Auxiliary retainer 110 is installed on the upside of pinch roll retainer 56.Similar with retainer supporting member 57 to pinch roll retainer 56, auxiliary retainer 110 forms elongated shape.Auxiliary retainer 110 is by making such as the synthetic resin of polyacetal resin (POM).Auxiliary retainer 110 is installed on the pinch roll retainer 56 with such orientation, and promptly the longitudinal direction 131 of auxiliary retainer 110 is corresponding to the axial direction of driven roller 47.
Support arm 111 is set to auxiliary retainer 110 end separately in 131 the two ends along the longitudinal direction.Each of support arm 111 is such member: it supports auxiliary retainer 110, makes that auxiliary retainer 110 can be with respect to pinch roll retainer 56 along the vertical direction, and the direction that promptly is used for moving towards and away from driven roller 47 pinch roll 48 moves.Each of support arm 111 has two bars 112 that extend from the lower surface of auxiliary retainer 110 downwards.Hook 113 is set to the end of each bar 112, and hook 113 is outwards outstanding along shorter direction 132.When in the otch 76 that each of support arm 111 is pushed pinch roll retainer 56, hook 113 is subjected to linking up with rib 70 extruding, makes two bars 112 along toward each other direction bendings.Therefore, hook 113 can be inserted by otch 76.When hook 113 was linked up with the lower end of rib 70 by otch 76 insertions and process, bar 112 returned to their original shapes, and hook 113 engages with the lower end of hook rib 70.Like this, will assist retainer 110 to be installed on the pinch roll retainer 56.
Under auxiliary retainer 110 was installed in state on the pinch roll retainer 56, the bar 112 of support arm 111 was restricted to the guider of above-below direction as the moving direction that will assist retainer 110.The moving range of auxiliary retainer 110 is determined by the distance between the lower end of hook 113 and hook rib 70.That is to say that when promoting to assist retainer 110 under the state that is installed at auxiliary retainer 110 on the pinch roll retainer 56, hook 113 is spaced apart with the lower end of hook rib 70 downwards.In contrast, when upwards retainer 110 was assisted in lifting, hook 113 engaged with the lower end of hook rib 70.
Under disc spring 61 is contained in state in the spring container cavity 62, on disc spring 61, will assist retainer 110 to be installed on the pinch roll retainer 56.Therefore, do not having external force to be applied under the state of auxiliary retainer 110, auxiliary retainer 110 upwards promotes constantly by the motive force of disc spring 61.On the contrary, if the external force of downward direction is applied to auxiliary retainer 110, then disc spring 61 is compressed, thereby assists retainer 110 along the direction dislocation towards pinch roll retainer 56.In the present embodiment, be configured to printer portion 2 if will be in the parts (member) of the assembled state shown in Fig. 5, then pinch roll 48 is pressed on the driven roller 47, thereby auxiliary retainer 110 is also pushed downwards via pinch roll 48.Therefore, will assist retainer 110 to be configured under the state of printer portion 2, auxiliary retainer 110 is retained as and makes auxiliary retainer 110 to move in above-mentioned moving range along the vertical direction.
Seven second guiding ribs 66 are wholely set the upper surface of auxiliary retainer 110.The leading edge that second guiding rib 66 is set to be used for the recording sheet that will carry from upstream side this clamp-press part that leads smoothly to conveying roller 54.Each of second guiding rib 66 is along shorter direction 132, and promptly throughput direction extends on the upper surface of auxiliary retainer 110.Second guiding rib 66 along the longitudinal direction 131, promptly the axial direction of driven roller 47 is arranged abreast.The second guiding rib 66A that is arranged in the both end sides place of auxiliary retainer 110 forms along shorter direction 132 shape longer than other second guiding rib 66.
The 3rd guiding rib 64 is arranged on auxiliary retainer 110 131 center along the longitudinal direction.The 3rd guiding rib 64 from downstream side 60 along the direction identical with first guiding rib 75, promptly outstanding along downstream direction.The 3rd guiding rib 64 is provided with integratedly with auxiliary retainer 110.Similar to first guiding rib 75, when recording sheet was transported to the upper surface of the 3rd guiding rib 64, the upper surface of the 3rd guiding rib 64 was used for towards the leading edge of platen 34 side directed these recording sheets.In addition, the 3rd guiding rib 64 also is used for and will be supported on the position of close this clamp-press part from this trailing edge to the recording sheet of the clamp-press part separation of conveying roller 54, thereby the trailing edge of recording sheet can not contact the roller surface of pinch roll 48.The 3rd guiding rib 64 is projected into the terminal identical position with first guiding rib 75.
Bearing 63A is set to auxiliary retainer 110 end separately in 131 the two ends along the longitudinal direction.In addition, bearing 63B is set to the 3rd guiding rib 64.The rotating shaft 65 of pinch roll 48 supports by bearing 63A and bearing 63B.Bearing 63A is 60 outstanding towards the downstream from holding.The two ends of rotating shaft 65 are supported by bearing 63A.Each of bearing 63A forms groove shapes, and wherein the import department of each bearing 63A (groove) is slightly smaller than the diameter of rotating shaft 65.Therefore, when pushing rotating shaft 65 among the bearing 63A, the distortion of the import department of each bearing 63A also enlarges to allow rotating shaft 65 to insert among the bearing 63A.In case rotating shaft 65 is inserted among the bearing 63A, and the import department of distortion returns to its original shapes, thereby rotating shaft 65 can easily not thrown off.On the other hand, the central part of rotating shaft 65 supports by bearing 63B.Bearing 63B is set to the 3rd guiding rib 64 that is positioned at end 60 side places, and has groove shapes.When rotating shaft 65 applies downward load, bearing 63B is used for auxiliary ground supporting rotating shaft 65.
As mentioned above, in the present embodiment, second guiding rib 66 and the 3rd guiding rib 64 are set to auxiliary retainer 110 integratedly.Therefore, only the rotating shaft 65 of pinch roll 48 between each guiding rib 64,66 and pinch roll 48.Therefore, the dimensional tolerance of height of influence from pinch roll 48 to each guiding rib 64,66 only is each the accumulated value of dimensional tolerance of pinch roll 48, rotating shaft 65 and auxiliary retainer 110.Thereby, compare with traditional supporting mechanism that the dimensional tolerance that is subjected to a large amount of members influences, can reduce guiding rib 64 and 66 site errors with respect to pinch roll 48.In other words, the distance between pinch roll 48 and guiding rib 64 and 66 can remain on steady state value accurately.Therefore, when recording sheet entered this to the clamp-press part of conveying roller 54, this recording sheet was by second guiding rib 66 clamp-press part that leads smoothly.In addition, when the trailing edge of recording sheet when clamp-press part separates, the trailing edge of recording sheet leads towards the downstream smoothly by the 3rd guiding rib 64.Therefore, can prevent because the transmission failure that site error caused of guiding rib 64 and 66 is carried such as the inclination of paperboard and recording sheet.
<pinch roll 48 〉
As shown in Fig. 5 and Fig. 6, pinch roll 48 forms cylindrical shape and is made by resin with good sliding properties etc.Each of pinch roll 48 forms with the cylindrical shape that is formed with the endoporus that in axial direction extends.Rotating shaft 65 inserts in this endoporus.Utilize this configuration, pinch roll 48 can be with respect to rotating shaft 65 rotations.Although rotating shaft 65 can be made by the various materials such as synthetic resin and metal, preferred rotating shaft 65 is used to make pinch roll 48 to rotate smoothly by making such as stainless steel.Thus, can make minor diameter but rotating shaft 65 with enough rigidity.In the present embodiment, as shown in the drawing, two pinch rolls 48 rotatably support by rotating shaft 65.Notice that the quantity and the length of pinch roll 48 can make amendment as required.
Like this, because being supported for, pinch roll 48 makes that pinch roll 48 can be with respect to rotating shaft 65 rotations, so needn't rotating shaft 65 rotation in groove 78 certainly.Therefore, groove 78 can have such size, and promptly rotating shaft 65 can seamlessly be inserted.Yet in the present embodiment, groove 78 has such size, i.e. groove 78 supporting rotating shaft 65 rotatably under the situation that does not have resistance substantially.Therefore, fixed to one another even pinch roll 48 and rotating shaft 65 become, thus pinch roll 48 can not rotate by relative rotation axi 65, and pinch roll 48 also can relative auxiliary retainer 110 rotations with rotating shaft 65.
In the present embodiment, pinch roll 48, rotating shaft 65 and auxiliary retainer 110 are described as separating member.Yet these members are not to be necessary for separating member.For example, rotating shaft 65 can be set to auxiliary retainer 110 integratedly.In this case, when inserting rotating shaft 65 in the groove 78, auxiliary retainer 110 and rotating shaft 65 are located with respect to the throughput direction of recording sheet.Utilize this configuration, the dimensional tolerance that influences the position of guiding rib 64 and 66 only is two members of pinch roll 48 and auxiliary retainer 110.Therefore, can make the site error of guiding rib 64 and 66 littler.Notice that rotating shaft 65 is not limited to and auxiliary retainer 110 identical materials.For example, if rotating shaft 65 and auxiliary retainer 110 are integrally formed by insert molding, then rotating shaft 65 can be made by steel, and auxiliary retainer 110 can be made by synthetic resin.
In addition, rotating shaft 65 can be wholely set pinch roll 48.In this case, when inserting rotating shaft 65 in the groove 78, pinch roll 48 and rotating shaft 65 are located with respect to the throughput direction of recording sheet.When rotating shaft 65 and pinch roll 48 were integrally formed by this way, the dimensional tolerance that influences the position of guiding rib 64 and 66 only was two members of pinch roll 48 and auxiliary retainer 110.Therefore, can make the site error of guiding rib 64 and 66 littler.Notice that rotating shaft 65 is not limited to and pinch roll 48 identical materials.For example, if rotating shaft 65 and pinch roll 48 are integrally formed by insert molding, then rotating shaft 65 can be made by steel, and pinch roll 48 can be made by synthetic resin.
Because the supporting mechanism of pinch roll 48 is constructed by this way, so pinch roll retainer 56 supports movably by retainer supporting member 57.Pinch roll 48 utilizes the rolling movement of pinch roll retainer 56 and dislocation.More specifically, pinch roll retainer 56 can move between the transfer position (primary importance) shown in the punctured position shown in Fig. 8 A (second place) and Fig. 8 B.
In addition, in the present embodiment, the 3rd guiding rib 64 is set to auxiliary retainer 110, as mentioned above.Pinch roll 48 supports by auxiliary retainer 110.Therefore, when recording sheet kept clampingly by pinch roll 48 and driven roller 47, auxiliary retainer 110 and the 3rd guiding rib 64 and pinch roll 48 left the amount that driven roller 47 moves the thickness that equals recording sheet.That is to say the 3rd guiding rib 64 and pinch roll 48 mobile phases displacement together.Therefore, no matter whether recording sheet keeps clampingly by pinch roll 48 and driven roller 47, always the relative position of pinch roll 48 and the 3rd guiding rib 64 is constant.In other words, during carrying, the distance between the upper end of the lower surface of recording sheet and the 3rd guiding rib 64 can remain on constant distance.
Therefore, during recording sheet is carried conveying roller 54 by this, as shown in Fig. 9 A during when the thin recording sheet 98 by this conveying roller 54 carried such as the duplicator paper and as Fig. 9 B as shown in two kinds of situations during when the thick recording sheet 99 of conveying such as postcard, the 3rd guiding rib 64 and pinch roll 48 are pushed down.Therefore, always remain on steady state value apart from T1 between the lower surface of recording sheet and the 3rd guiding rib 64.
By using this supporting mechanism, can above-mentioned be set at steady state value apart from T1 with necessary minimum of a value.Therefore, even at the trailing edge of recording sheet from the clamp-press part after separating between pinch roll 48 and the driven roller 47 at once, the trailing edge of recording sheet also can be supported near the clamp-press part by the 3rd guiding rib 64.That is to say that do not contact the position on the roller surface of pinch roll 48 at trailing edge, recording sheet also can be supported.This prevents recording sheet because the roller surface of the trailing edge of recording sheet and pinch roll 48 does not contact and promoted by pinch roll 48.In addition, suppose when carrying the reclinate recording sheet of its trailing edge or with the recording sheet of waveform state bending, and the situation of the trailing edge of recording sheet when the 3rd guiding rib 64 hangs down and contact the roller surface of pinch roll 48.Even in this case, recording sheet and roller surface also contact with each other near clamp-press part, make recording sheet and roller surface form the acute angle that is in the basic horizontal state.Therefore, continue to use in the power of the direction that promotes recording sheet very little.Thus, recording sheet can not be pushed to the downstream.
In addition, in the present embodiment, as shown in Fig. 9 A and Fig. 9 B, the 3rd guiding rib 64 is arranged so that the contiguous virtual plane 88 that hereinafter will describe in the upper end of the 3rd guiding rib 64.This is used to utilize driven roller 47 and pinch roll 48 to keep clampingly to conveying roller 54 and carries recording sheet.Therefore, approximate corresponding to this virtual plane 88 near the transport path the conveying roller 54 at this, wherein virtual plane 88 is by the intersection of following each face: plane 87 comprises the axis of the rotating shaft 65 of the axis of driven roller 47 and pinch roll 48; And the roller surface of pinch roll 48 the roller surface of driven roller 47 sides (in Fig. 9 A and Fig. 9 B in the face of), and wherein virtual plane 88 perpendicular to plane 87.If the contiguous virtual plane 88 in the upper end of the 3rd guiding rib 64, then from the clamp-press part after separating between driven roller 47 and the pinch roll 48 at once at the trailing edge of recording sheet, the 3rd guiding rib 64 can support the trailing edge of recording sheet, thereby this trailing edge can not contact the roller surface of pinch roll 48.
In addition, at the structure that is used for supporting movably pinch roll retainer 56, when pinch roll retainer 56 moves to punctured position, between the upstream side 95 of the rib 94 of platen 34 and pinch roll retainer 56, form and have clearance of predetermined width T2 (seeing Fig. 8 A).Yet this gap T2 is by above-mentioned first guiding rib 75 and 64 sealings of the 3rd guiding rib.Therefore, even moved towards gap T2 by this recording sheet that conveying roller 54 is carried, first guiding rib 75 and the 3rd guiding rib 64 prevent that also recording sheet from entering among the T2 of this gap.Simultaneously, by first guiding rib 75 and the 3rd guiding rib 64 leading edge of recording sheet is directed to platen 34 sides.More specifically, the leading edge of recording sheet is directed to the inclined-plane 96 at upstream side 95 places that are formed on rib 94.Therefore, 96 upper surfaces towards rib 94 lead smoothly along the inclined-plane with recording sheet.Thus, recording sheet can stably be transported to platen 34, and can also prevent paperboard.
In the present embodiment, as shown in Fig. 8 A and Fig. 8 B, first guiding rib 75 and the 3rd guiding rib 64 are arranged on corresponding to the position that is formed on the gap between the adjacent rib 94, thereby first guiding rib 75 and the 3rd guiding rib 64 are not interfered a plurality of ribs 94 of the upstream side 95 that extends to platen 34.In the present embodiment, the overhang of first guiding rib 75 and the 3rd guiding rib 64 (outstanding length) be set at make win guiding rib 75 and the 3rd guiding rib 64 enter gap between the rib 94, with along throughput direction by the location independent of the pinch roll retainer 56 of removable support.In other words, even first guiding rib 75 and the 3rd guiding rib 64 are arranged so that working as pinch roll retainer 56 remains on apart from platen 34 position farthest, be the punctured position shown in Fig. 8 A (second place) when locating, the upstream side 95 of platen 34 also intersects with first guiding rib 75 and the 3rd guiding rib 64 in plane.Therefore, supporting under the state of pinch roll retainers 56, no matter the position of pinch roll retainer 56 how, in the gap between total first guiding rib 75 and the 3rd guiding rib 64 insertion ribs 94 (seeing Fig. 8 A and Fig. 8 B) by retainer supporting member 57.In addition, when pinch roll retainer 56 with rolling movement on retainer supporting member 57 when mobile, first guiding rib 75 and the 3rd guiding rib 64 reciprocally move along throughput direction.Utilize this to move back and forth, first guiding rib 75 and the 3rd guiding rib 64 insert in the gap that is formed between the rib 94 and withdraw from described gap.
As shown in Fig. 8 A and Fig. 8 B, first guiding rib 75 is arranged so that the upper surface (spigot surface) of first guiding rib 75 is positioned at the position lower than the upper surface of platen 34.Utilize this configuration, though when recording sheet when first guiding rib 75 is carried, the leading edge of this recording sheet platen 34 sides that also lead smoothly.Then, the recording sheet that the is directed to platen 34 sides supporting base that leads smoothly by this way, promptly recording sheet moves on the inclined-plane 96 that the upstream side 95 (rear end) that is formed on platen 34 is located.
In the present embodiment, first guiding rib 75 is arranged so that the upper surface of first guiding rib 75 is positioned at the position lower than the upper surface of platen 34, and the upper surface of first guiding rib 75 is positioned at the high position, lower end than the inclined-plane 96 of the upstream side 95 (rear end) of platen 34.Therefore, the recording sheet platen 34 that can lead more smoothly.
The moving range of<pinch roll retainer 56 〉
Hereinafter will be described the moving range of pinch roll retainer 56 on retainer supporting member 57.
In the present embodiment, as shown in Figure 10, be attached at retainer supporting member 57 under the state of framework, the bottom surface 69 of the recess 139 of retainer supporting member 57 (bottom surface that comprises concave shaped portion 141) forms crooked shape.Place at rolling bearing 80 under the state between the bottom surface of bottom surface 69 and pinch roll retainer 56, pinch roll retainer 56 is supported at its place, bottom surface.
As shown in Figure 10, the bottom surface 69 of recess 139 is downward-sloping towards the downstream from upstream side.Bottom surface 69 has and the approximate corresponding shape of the arc of cylindricality, and this arc wraparound is changeed center O and drawn, and this centre of gyration is included in by in the perpendicular of the central shaft A of driven roller 47 and parallel with this central shaft A.Therefore, pinch roll retainer 56 69 moves along the bottom surface by rolling bearing 80.In other words, pinch roll retainer 56 wraparounds commentaries on classics center O moves as rotating center.At this moment, because auxiliary retainer 110 utilizes the rolling movement of pinch roll retainer 56 to be promoted by disc spring 61, so pinch roll 48 outer peripheral face along driven roller 47 in the lasting state that keeps being pressed on the driven roller 47 moves.Notice centre of gyration O be included in by in the perpendicular of central shaft A not necessarily.When pinch roll retainer 56 is positioned at the primary importance place, centre of gyration O is positioned at the second place side place on the plane of the central shaft B that comprises this central shaft A and pinch roll 48, thereby along with pinch roll retainer 56 side shifting upstream, the decrement of disc spring 61 becomes littler, and this is enough.
In the present embodiment, as shown in Figure 10, pinch roll retainer 56 is restricted to scope between following along the moving range of shorter direction 132: transfer position, at this transfer position place, along the direction towards the rear side of driven roller 47, the angle that is formed between the plane of perpendicular by centre of gyration O and the central shaft B by centre of gyration O and pinch roll 48 is θ 1; And punctured position, in this collapsed position, along the direction towards the rear side of driven roller 47, the angle that is formed between the plane of perpendicular by centre of gyration O and the central shaft B by centre of gyration O and pinch roll 48 is θ 2 (greater than θ 1).Notice be used to limit along shorter direction 132 forwards to the prodger 68 of moving range and the downstream inwall of engagement recesses 67 as first limiting member of the present invention.In addition, be used to limit upstream side inwall along the prodger 68 of the moving range of the backward directions of shorter direction 132 and engagement recesses 67 as second limiting member of the present invention.
Pinch roll retainer 56 and retainer supporting member 57 are constructed as mentioned above.Therefore, when recording sheet keeps conveying roller 54 clampingly by this (during the conveying at recording medium), pinch roll retainer 56 moves (seeing Fig. 8 B) to transfer position.In contrast, when the trailing edge of recording sheet when this separates conveying roller 54 (not during the conveying at recording medium), pinch roll retainer 56 moves (seeing Fig. 8 A) to punctured position.
The basic principle of the rolling movement of<pinch roll retainer 56 〉
Next, the basic principle of the rolling movement of pinch roll retainer 56 is described with reference to Figure 11 and Figure 12.Here, Figure 11 is presented at the schematic diagram of center O as the cross section of driven roller 47 and pinch roll 48 in the XY coordinate of initial point.Figure 12 is presented at the schematic diagram that driven roller 47 and pinch roll 48 in the XY coordinate of Figure 11 clamp the state of the ground sheet material of holding the record (indicating by mark S).Here, A is the pivot of driven roller 47, and r1 is the radius of driven roller 47, and B is the pivot of pinch roll 48, and r2 is the radius of pinch roll 48.Pivot A is positioned on the X-axis.Initial point O is positioned at pivot A is separated by more than or equal to the position of the radius of driven roller 47 along the negative direction of X-axis.In addition, initial point O overlaps with the curved center of the bottom surface 69 of recess 139, and promptly initial point O overlaps with above-mentioned centre of gyration O.Pinch roll retainer 56 can move between following: from X-axis is the position D that θ 1 is moved at the center around initial point O in the counterclockwise direction; And from the position E of the mobile similarly θ 2 of X-axis (greater than θ 1).Here, position D is corresponding to above-mentioned transfer position (seeing Fig. 8 B), and position E is corresponding to above-mentioned punctured position (seeing Fig. 8 A).Notice,, center O, A and B are defined as shown in Figure 11 and Figure 12 for ease of describing.Yet needless to say, the position at the center separately of driven roller 47, pinch roll 48 and bottom surface 69 is not limited to above-mentioned position.
Here, angle θ is defined as when pinch roll 48 moves to the optional position, is formed on the angle between line segment OA and the line segment OB.That is to say that the possible range of angle θ is θ 1≤θ≤θ 2.Pinch roll 48 promotes (direction of section AB along the line) by the disc spring that is in compressive state 61 that is contained in the pinch roll retainer 56 towards driven roller 47.
As shown in the drawing, if θ〉0, then rotation (moving) the center A of the center O of arc DE and driven roller 47 does not match.Therefore, along with the increase of θ, pinch roll retainer 56 and driven roller 47 are relative remotely to be separated.Therefore, along with the increase of θ, disc spring 61 launches.That is to say that along with the increase of θ, the elastic energy E of disc spring 61 reduces.At this moment, moment M1 acts on the pinch roll 48, and this moment M1 is in the counterclockwise direction and around center A, and promptly along the direction perpendicular to line segment AB, moment M1 has the proportional value of reduction amount dE/d θ with elastic energy E.
On the other hand, the driven rotation of pinch roll 48 causes frictional force (moment of friction) M2 ' to act on the pinch roll 48, and frictional force M2 ' is around center B and along the direction opposite with the direction of rotation of pinch roll 48.Moment M2 is defined as by frictional force M2 ' being converted to the power around center A, promptly along the moment that obtains perpendicular to the power of the direction of line segment AB.The frictional force M2 ' that generate this moment is the stiction that generates in the sliding surface between pinch roll 48 and rotating shaft 65 owing to the rotation of pinch roll 48.Notice that moment M2 is not shown in Figure 11.
In addition, when pinch roll retainer 56 is mobile on the bottom surface 69 of the recess 139 of retainer supporting member 57, generate force of rolling friction (moment of friction) M3 '.This force of rolling friction M3 ' is around center O, promptly along the directive effect perpendicular to line segment OB.Moment M3 is defined as by force of rolling friction M3 ' being converted to the power around center A, promptly along the moment that obtains perpendicular to the power of the direction of line segment AB.Here, above-mentioned force of rolling friction is called moment M3.Notice that moment M3 is not shown in Figure 11.
In addition, as shown in Figure 12, when carrying recording sheets by driven roller 47 and pinch roll 48, comprise recording sheet weight, since the power W of the elastic force of the bending of recording sheet etc. along directive effect towards the center of pinch roll 48.Power W causes generating moment M4 along the direction that reduces angle θ.Especially, in the present invention, as shown in the drawing, recording sheet is transferred to making recording sheet be pressed on the platen 34 the moment M4 of the degree that this generation be can not ignore with angle θ from upside.Notice that EI is defined as the rigidity of recording sheet.
In addition, when the leading edge of recording sheet enters clamp-press part between driven roller 47 and the pinch roll 48, perhaps when the trailing edge of recording sheet when clamp-press part separates, the length of disc spring 61 changes the amount of the thickness h that equals recording sheet.More specifically, in the former situation, disc spring 61 is compressed thickness h, and in the latter's situation, disc spring 61 expansion thickness h.Therefore, equally in this case, the elastic energy of disc spring 61 increases and reduces, and is similar to above-mentioned moment M1, generates around center A and has moment M5 with the proportional value of dE/d θ.
Here, angle θ (θ 1≤θ≤θ 2), the thickness h of recording sheet and the rigidity EI of recording sheet are variablees.Therefore, moment M1 is with the function representation of angle θ and thickness h.Moment M4 is with the function representation of angle θ and rigidity EI.Moment M5 is with the function representation of thickness h.Although on accurate meaning, moment M2 and M3 are the functions of angle θ and thickness h, compare with M5 with moment M1, M4, moment M2 and M3 are very little.Therefore, here moment M2 and M3 are considered as constant.Hereinafter, the function of angle θ is with M1 (θ) and M4 (θ) expression.
Suppose between driven roller 47 and pinch roll 48, not produce and slide.And the frictional force between hypothesis driven roller 47 and the pinch roll 48 is enough big, and the frictional force between pinch roll 48 and the recording sheet is enough big.So, in the present embodiment, above-mentioned moment M1 satisfies the hereinafter expression formula of indication to M5.
That is to say, when recording sheet is not carried by driven roller 47 and pinch roll 48, satisfy following expression (1).At this moment, moment M2 acts on along clockwise direction around center A, and moment M3 acts in the counterclockwise direction around center A.
M1(θ)+M3>M2 (1)
Therefore, in this case, pinch roll retainer 56 moves towards upstream side along the throughput direction of recording sheet, and to after-contraction.Then, the attitude of pinch roll retainer 56 position (punctured position) that remains on θ=θ 2 is located.
When the clamp-press part between recording sheet arrival driven roller 47 and the pinch roll 48, the leading edge of recording sheet keeps clampingly by the rotation of driven roller 47, and satisfies following expression (2).At this moment, moment M3 acts in the counterclockwise direction around center A, and moment M5 acts on along clockwise direction around center A.
M1(θ)+M3<M4(θ)+M5 (2)
At this moment, pinch roll retainer 56 moves towards the downstream along throughput direction, locates and the attitude of pinch roll retainer 56 remains on the position (transfer position) of θ=θ 1.
During the conveying of recording sheet, satisfy following expression (3).At this moment, moment M2 acts on along clockwise direction around center A, and moment M3 acts on along clockwise direction around center A.
M1(θ)<M2+M3+M4(θ) (3)
Therefore, the attitude of pinch roll retainer 56 position (transfer position) of continuing to remain on θ=θ 1 is located.
When the trailing edge of recording sheet from driven roller 47 when clamp-press part between the pinch roll 48 separates, satisfy following expression (4).At this moment, moment M3 acts on along clockwise direction around center A, and similar to moment M1, moment M5 acts in the counterclockwise direction around center A.
M1(θ)+M5>M3 (4)
As understanding, when the trailing edge of recording sheet generates moment M1 (θ)+M5 (left side) from driven roller 47 when clamp-press part between the pinch roll 48 separates, and has only moment M3 (right side) as frictional force from top expression formula (4).Here, be used for moving moment M1 (the θ)+M5 of pinch roll retainer 56 greater than the moment M3 that is used to prevent rolling movement towards the upstream side of recording sheet.Therefore, pinch roll retainer 56 moves towards the upstream side of recording sheet.Here, moment M3 is the less friction that is generated by rolling bearing 80.That is to say that compare with moment M1 (θ)+M5, moment M3 is very little.Therefore, in this case, most moment M1 (θ)+M5 is used for moving pinch roll retainer 56 towards the upstream side of recording sheet.Thereby, pinch roll retainer 56 fast moving.Notice that in case pinch roll retainer 56 shrinks, the attitude of pinch roll retainer 56 just remains on the position (punctured position) of θ=θ 2 and locates.
If at the trailing edge of recording sheet from the clamp-press part after separating between driven roller 47 and the pinch roll 48, the abnormality that pinch roll retainer 56 does not turn back to the position (punctured position) of θ=θ 2 appears, then driven roller 47 is controlled as along opposite direction rotation, thereby satisfies following expression (5).Therefore, pinch roll retainer 56 can move to the position (punctured position) of θ=θ 2.
M1(θ)+M2>M3 (5)
In this case, moment M2 acts in the counterclockwise direction around center A, and moment M3 acts on along clockwise direction around center A.
As mentioned above, in multifunctional equipment 1, wherein pinch roll retainer 56 supports movably via rolling bearing 80, and pinch roll 48, pinch roll retainer 56, retainer supporting member 57, disc spring 61 etc. are arranged so that and satisfy expression formula (1) to (5).Utilize this configuration, when recording sheet kept conveying roller 54 clampingly by this, pinch roll retainer 56 moved towards the downstream apace along throughput direction.In addition, when the above-mentioned clamping of recording sheet was released, pinch roll retainer 56 moved towards the downstream apace along throughput direction.Therefore, compare, can make along the amount of throughput direction promotion recording sheet almost nil with the traditional structure that uses sliding friction.This quality that prevents to be recorded in the image on the recording sheet descends.
Although the present invention is described in detail with reference to the above embodiment of the present invention, those skilled in the art be it is evident that under the situation of the scope that does not depart from claim, can make various changes and modifications therein.
<comparative example 〉
Hereinafter, comparative example will be described.The proposition comparative example is used to describe the advantage according to the sheet material conveyor and the image recorder of the foregoing description.
To Figure 14 B first comparative example is described with reference to Figure 13 A.To as shown in the 13C, the ink jet type image recorder of first comparative example is provided with the sheet material conveyor 210 of carrying recording sheet S towards platen 202 according to the present invention as Figure 13 A.This sheet material conveyor 210 comprises and is arranged in a pair of conveying roller 203 that platen 202 locates along the upstream side of throughput direction (hereinafter referred is " upstream side ") and is arranged in a pair of outlet roller 204 that platen 202 is located along the downstream (hereinafter referred is " downstream ") of throughput direction.
When image is recorded in the image recorder, drive this off and on to conveying roller 203, be used for carrying recording sheet S off and on predetermined length.During the dwell time of this intermittent delivery, record head 200 slides mobile along the direction (perpendicular to the direction of Figure 13 A to the drafting sheet material of Figure 13 C) vertical with the throughput direction of recording sheet S (left and right directions of Figure 13 A in Figure 13 C), nozzle from record head 200 sprays ink simultaneously, thereby ink adheres to this recording sheet S.Repeat this operation for each intermittent delivery, thereby image is recorded on the recording sheet S continuously with predetermined length.Notice that the controller (not shown) controls this to conveying roller 203 and this rotation to outlet roller 204, thereby carry out above-mentioned intermittent delivery.
To as shown in Figure 13 C, this comprises driven roller 205 and driven voller 206 to conveying roller 203 as Figure 13 A.Driven roller 205 receives from the revolving force of transmission such as motor, and is driven in rotation.Driven voller 206 by promotions such as disc springs 207 so that be pressed on the driven roller 205, and driven the rotation.As shown in Figure 13 A, when the leading edge from the recording sheet S of sheet material supply box (not shown) supply arrives this to conveying roller 203, the leading edge driven rolls 205 of recording sheet S and driven voller 206 clampings, and this begins to carry recording sheet S to conveying roller 203.At this moment, disc spring 207 is compressed the amount of the thickness of recording sheet S, and driven voller 206 separates from driven roller 205.S is transferred along with recording sheet, and to outlet roller 204 clampings, and as shown in Figure 13 B, recording sheet S is carried outlet roller 204 conveying roller 203 and this by this leading edge of recording sheet S by this.Along with recording sheet S is further carried, as shown in Figure 13 C, the trailing edge of recording sheet S separates conveying roller 203 from this, and recording sheet S is only carried outlet roller 204 by this.At this moment, the amount of the thickness of disc spring 207 extension record sheet material S, and driven voller 206 is pressed on the driven roller 205.Notice similarly to conveying roller 203 to this, this also comprises driven roller 208 and driven voller 209 to outlet roller 204.Here,, this has write down record images sheet material S thereon because being used for clamping to outlet roller 204, thus extruding force is set at little value, so that prevent the deterioration of image.
Yet, utilize above-mentioned sheet material conveyor 210, as shown in Figure 14 A, at the trailing edge of recording sheet S at once from clamp-press part (pressure portion) after separating, the roller surface of this trailing edge contact driven voller 206.Therefore, if the rotation roller surface of the trailing edge of recording sheet S contact driven voller 206, then recording sheet S is from the power F (see Figure 14 B) of this reception edge, roller surface with the throughput direction equidirectional.This power F does in order to promote recording sheet S along throughput direction.If recording sheet S is promoted by this power F when carries out image on recording sheet S writes down, then this recording sheet S is exceeded requiredly and carries, and causes the image record position to depart from along throughput direction.Thus, such problem occurs, promptly cause being called the phenomenon of " band " (being also referred to as " image jump "), this will make picture quality obviously descend.Especially, in following structure, wherein recording sheet is being transferred when oblique upside is pressed to platen 202, partly because the front edge side of recording sheet S by this to outlet roller 204 clampings, so from this at once to conveying roller 203 after separatings at trailing edge, trailing edge is because the restoring force of crooked recording sheet S and towards driven voller 206 side shiftings, and touch roll surface effectively.In this case, above-mentioned zoning obviously occurs.At the recording sheet S that conveying has big relatively thickness and relative high rigidity, during postcard and glazed paper, above-mentioned zoning also obviously occurs.
Next, second comparative example will be described.Japan patent applicant announce No.2007-261061 discloses a kind of image recorder that is provided with conveying device, and this conveying device comprises the pinch roll (48) by the vertical resiliency supported of pinch roll retainer (56).In this image recorder, pinch roll retainer (56) is supported for and makes pinch roll retainer (56) to move between the primary importance and the second place.When the trailing edge of recording sheet from driven roller (47) when clamp-press part between the pinch roll (48) separates, pinch roll (48) and pinch roll retainer (56) move into place the second place in upstream side from primary importance.In addition, as shown in Figure 14 of Japan patent applicant announce No.2007-261061, pinch roll retainer (56) is provided with towards the side-prominent guiding rib (75) of platen (94).Guiding rib (75) is outstanding from pinch roll (48) towards platen (94).In this image recorder, from the clamp-press part after separating between driven roller (47) and the pinch roll (48), this trailing edge supports by guiding rib (75) at the trailing edge of recording sheet.If the separating distance between the outer peripheral face of the upper end of guiding rib (75) and driven roller (47) is big with respect to the thickness of recording sheet, then at the trailing edge of recording sheet from this clamp-press part after separating at once, the contact of the trailing edge of recording sheet moves to the roller surface of the pinch roll (48) of the second place.In this case, even for the image recorder of announcing among the Japan patent applicant announce No.2007-261061, also can cause the bar zoning.Notice that the numeral in the round parentheses is the numeral of using in Figure 14 of Japan patent applicant announce No.2007-261061.Following description is like this equally.
If above-mentioned separating distance is set at little value, then can suppress this zoning.Yet, utilize the image recorder of Japan patent applicant announce No.2007-261061, since as follows, this separating distance can not be set at enough little value.Can comprise such as the thin recording sheet of duplicator paper and such as the thick of postcard and glazed paper and rigidity recording sheet by the recording sheet of image recorder record.In the image recorder of Japan patent applicant announce No.2007-261061, guiding rib (75) is set to pinch roll retainer (56).Therefore, if pinch roll retainer (48) along the elasticity direction with respect to pinch roll retainer (56) dislocation, then the relative position between pinch roll (48) and the guiding rib (75) changes.Utilize this structure, if above-mentioned separating distance is set at value less than the thickness of recording sheet, then this recording sheet can not through and bump guiding rib (75), produce the problem of the transmission failure that damages such as paperboard and recording sheet.Therefore, in the image recorder of Japan patent applicant announce No.2007-261061, above-mentioned separating distance is set at the thickness that is suitable for the thickest recording sheet.Therefore, separating distance need be set at respect to big value such as the thickness of the thin recording sheet of duplicator paper.
Next, the 3rd comparative example will be described.Similar to above-mentioned second comparative example, Japan patent applicant announce No.2007-175991 discloses a kind of mechanism that supports the pinch roll retainer, this pinch roll retainer supports pinch roll, thereby this pinch roll retainer can move between the primary importance and the second place.In this mechanism, when the trailing edge of recording sheet from driven roller when clamp-press part between the pinch roll separates, the pinch roll retainer moves to the second place.In Japan patent applicant announce No.2007-175991, the second place is set at the position that is positioned at the upstream side place of the perpendicular by above-mentioned clamp-press part at its place's pinch roll, i.e. position of not intersecting with perpendicular on the roller surface of its place's pinch roll.Therefore, when the trailing edge of recording sheet when clamp-press part separates, the trailing edge of recording sheet is not easy to contact the roller surface of pinch roll.Yet, at the trailing edge of recording sheet at once, still do not carry out the rolling movement of pinch roll from the clamp-press part after separating, and in some cases, the roller surface of the trailing edge moment ground contact pinch roll of recording sheet.Therefore, even, can not eliminate the appearance of bar zoning for disclosed mechanism in Japan patent applicant announce No.2007-175991.Especially, if the second place is set at above-mentioned position, the size that then depends on the external diameter of pinch roll, it is big that the rolling scope of pinch roll retainer becomes, in this case, the initial rolling movement of pinch roll retainer can not be carried out apace, and the trailing edge of recording sheet contacts the roller surface of pinch roll continually.In addition, if the second place is set at above-mentioned position, the expansion of the scope of then rolling has increased the size of equipment, and in some cases, because the expansion of rolling scope needs to increase spring force.In addition, because the nip angle of clamp-press part increases in the horizontal direction, so the adverse effect that becomes complicated to the sheet material feed lines of clamp-press part also occurs.
First to the 3rd comparative example has the problems referred to above.Yet, according to the sheet material conveyor of this embodiment and image recorder can prevent recording medium from the clamp-press part after separating between driven roller and the driven voller at once recording medium promoted by driven voller, thereby improve the quality that is recorded in the image on the recording medium.
Next, the 4th comparative example will be described.Japan patent applicant announce No.2007-90669 discloses a kind of recording equipment, and this recording equipment supports driven voller, makes this driven voller to move and can rotate along throughput direction.When the trailing edge of recording sheet from driven roller when clamp-press part between the driven voller separates, driven voller receives from the power of the trailing edge of recording sheet and towards upstream side and shrinks.More specifically, in the disclosed recording equipment, the retainer that supports driven voller is via the retainer support member support of rolling bearing by the framework of the equipment of being fixed in Japan patent applicant announce No.2007-90669, thereby this retainer can move.Utilize this configuration, retainer itself can move along throughput direction.
In the disclosed supporting mechanism, the rotating shaft (65) of pinch roll (48) is by bearing (63) location, so that increase the precision of the rolling movement of pinch roll retainer (56) in Japan patent applicant announce No.2007-90669.Therefore, can make the slackness of support portion of rotating shaft (65) littler, and during rolling movement, the power that applies from recording sheet can be transferred to pinch roll retainer (56) equably, thereby realizes rolling movement accurately.Yet in this supporting mechanism, rotating shaft (65) directly supports by pinch roll retainer (56), thereby rotating shaft (65) can move along the vertical direction.Therefore, even enter clamp-press part between driven roller (47) and the pinch roll (48) when recording sheet, when causing pinch roll (48) mobile along the vertical direction, pinch roll retainer (56) is also mobile.That is to say that only pinch roll (48) can move along the vertical direction, this causes problem described below.Notice that the numeral in the round parentheses is the numeral of using in Fig. 7 of Japan patent applicant announce No.2007-90669.Following description is like this equally.
In the above-mentioned supporting mechanism shown in Fig. 7 of Japan patent applicant announce No.2007-90669, retainer supporting member (57) is attached to main frame, and rolling bearing (80) is arranged on the supporting surface (upper surface) of retainer supporting member (57).Pinch roll retainer (56) is attached to the more upside of rolling bearing (80), and the rotating shaft (65) of pinch roll (48) rotatably supports via disc spring (61) by pinch roll retainer (56).In this supporting mechanism, because a plurality of member is positioned between retainer supporting member (57) and the pinch roll (48), so the accumulated size tolerance of each member causes the difference (error) of the height from pinch roll (48) to pinch roll retainer (56).If the minimum of a value of the dimensional tolerance of each member is accumulated, then the height from pinch roll (48) to pinch roll retainer (56) becomes maximum, causes pinch roll (48) to expose significantly towards driven roller (47) side from pinch roll retainer (56).In this case, the leading edge of the recording sheet of carrying towards the clamp-press part between driven roller (47) and the pinch roll (48) contacts the roller surface of pinch roll (48) in the position away from this clamp-press part.According to the degree of exposure of pinch roll (48), recording sheet enters and contacts the roller surface of pinch roll (48) with can becoming approximate right angle.In this case, recording sheet can not enter clamp-press part smoothly, and this causes paperboard before clamp-press part.
On the contrary, if the maximum of the dimensional tolerance of each member from retainer supporting member (57) to pinch roll (48) is accumulated, then the height from pinch roll (48) to pinch roll retainer (56) becomes minimum of a value.In other words, the distance between pinch roll (48) and the driven roller (47) becomes minimum of a value.In this case, following problem may occur, promptly above-mentioned distance becomes less than the maximum ga(u)ge of recording sheet that can be by the conveying of this device, and for example, can not pass through clamp-press part such as the thick recording sheet of postcard and glazed paper.
The 4th comparative example has the problems referred to above.Yet, can the leader record sheet material according to the sheet material conveyor of this embodiment and image recorder, make this recording sheet pass through the clamp-press part between driven roller and the driven voller smoothly, thereby in the mechanism of a plurality of member supports driven vollers, under the situation of the normal rolling movement that does not stop first supporting member (pinch roll retainer 56), prevent transmission failure such as the paperboard and the conveying of tilting.

Claims (15)

1. sheet material conveyor, described sheet material conveyor is transported to support member with sheet-shaped recording medium, and during the image record, described recording medium is placed on the described support member, and described sheet material conveyor comprises:
First delivery section has driven roller and faces the driven voller of arranging with described driven roller, and described first delivery section is carried recording medium towards described support member;
Rotating supporting member rotatably supports described driven voller;
First ways is set to described rotating supporting member and outstanding towards described support member;
First supporting member supports described rotating supporting member movably, makes described driven voller to move and to move away described driven roller towards described driven roller;
The pushing member is arranged between described first supporting member and the described rotating supporting member, and presses described driven voller and described rotating supporting member towards the driven roller thruster; And
Second supporting member, support described first supporting member, make described first supporting member can predetermined primary importance with described primary importance along mobile between the second place at the upstream side place of the throughput direction of described recording medium, during described first delivery section is carried described recording medium, described first supporting member moves to described primary importance, during described first delivery section was not carried described recording medium, described first supporting member moved to the described second place.
2. sheet material conveyor according to claim 1, wherein said first ways is arranged so that the contiguous virtual plane in the upper end of described first ways, and described virtual plane is by the intersection of following each face: the plane that comprises the axis of the axis of described driven roller and described driven voller; And the outer peripheral face that is positioned at described driven roller side place of described driven voller, described virtual plane is perpendicular to described plane.
3. sheet material conveyor according to claim 1, wherein said first delivery section is arranged so that: the clamp-press part between described driven roller and the described driven voller is positioned at the position higher than described support member, thus for the upper surface of described support member with the tilted alignment conveying recording medium.
4. sheet material conveyor according to claim 1, wherein said first ways are included in and become on the axial direction of described driven voller and put a plurality of first ways of layout.
5. sheet material conveyor according to claim 1, further comprise second delivery section, described second delivery section is arranged on the place, downstream along described throughput direction with leaving described first delivery section, and described second delivery section is carried the recording medium that is transported by described first delivery section towards the more downstream along described throughput direction.
6. sheet material conveyor according to claim 1, wherein said second supporting member comprises:
Supporting surface supports described first supporting member;
First limiting member limits the rolling movement of described first supporting member at described primary importance place; And
Second limiting member limits the rolling movement of described first supporting member at described second place place,
Wherein said second supporting member supports described first supporting member movably via mobile support unit, and
Wherein said mobile support unit comprises:
A plurality of recesses are formed in the described supporting surface of described second supporting member;
Rotary body is contained in described a plurality of recess; And
The supported portion of described first supporting member, under described rotary body was contained in state in described a plurality of recess, when described first supporting member of described second support member support, supported of described first supporting member contacted with the side face of described rotary body.
7. sheet material conveyor according to claim 1, described first supporting member of wherein said second support member support, thereby along with described first supporting member moves to the described second place from described primary importance, described first supporting member separates with described driven roller
Wherein said second supporting member makes the described first supporting member wraparound change center line and moves as the center, and described centre of gyration line is parallel with the axis of described driven roller,
Wherein said centre of gyration line is positioned at the second place side place as lower plane, and described plane comprises: the axis of described driven roller; And when described first supporting member is positioned at described primary importance place the axis of described driven voller, and
The described supporting surface of wherein said second supporting member corresponds essentially to around the outer peripheral face of described centre of gyration line as the predetermined cylinder of center drafting.
8. sheet material conveyor, described sheet material conveyor is carried sheet-shaped recording medium along predetermined throughput direction, and described sheet material conveyor comprises:
First delivery section has driven roller and driven voller, and described driven voller and described driven roller are arranged in the face of ground, and rotated when being configured on being pressed in described driven roller drivenly;
Rotating supporting member rotatably supports described driven voller;
Ways is set to described rotating supporting member integratedly, and described ways leader record medium makes described recording medium by the clamp-press part between described driven roller and the described driven voller;
First supporting member supports described rotating supporting member movably, makes described driven voller to move and to move away described driven roller towards described driven roller;
Align member is set to described first supporting member integratedly, and described align member is located the axle of described driven voller with respect to described throughput direction;
The pushing member is arranged between described first supporting member and the described rotating supporting member, and presses described rotating supporting member towards the driven roller thruster; And
Second supporting member, support described first supporting member, make described first supporting member can predetermined primary importance with described primary importance along mobile between the second place at the upstream side place of the throughput direction of described recording medium, during described first delivery section is carried described recording medium, described first supporting member moves to described primary importance, during described first delivery section was not carried described recording medium, described first supporting member moved to the described second place.
9. sheet material conveyor according to claim 8, wherein said align member comprises:
At least two ribs are given prominence to from described first supporting member, and are furnished with between described at least two ribs at interval along the axial direction of described driven roller; And
Groove is formed on the jag place of described at least two ribs, and the described axle of described driven voller inserts in the described groove.
10. sheet material conveyor according to claim 8, wherein said ways are set to being positioned at along the upper surface at the upstream side place of described throughput direction of described rotating supporting member, thereby with the described recording medium described clamp-press part that leads.
11. sheet material conveyor according to claim 8, further comprise second delivery section, described second delivery section is arranged on the place, downstream along described throughput direction with leaving described first delivery section, and described second delivery section is carried the recording medium that is transported by described first delivery section towards the more downstream along described throughput direction.
12. sheet material conveyor according to claim 8, wherein said second supporting member comprises:
Supporting surface supports described first supporting member;
First limiting member limits the rolling movement of described first supporting member at described primary importance place; And
Second limiting member limits the rolling movement of described first supporting member at described second place place,
Wherein said second supporting member supports described first supporting member movably via mobile support unit, and
Wherein said mobile support unit comprises:
A plurality of recesses are formed in the described supporting surface of described second supporting member;
Rotary body is contained in described a plurality of recess; And
The supported portion of described first supporting member, under described rotary body was contained in state in described a plurality of recess, when described first supporting member of described second support member support, supported of described first supporting member contacted with the side face of described rotary body.
13. sheet material conveyor according to claim 8, described first supporting member of wherein said second support member support, thereby along with described first supporting member moves to the described second place from described primary importance, described first supporting member separates with described driven roller
Wherein said second supporting member makes the described first supporting member wraparound change center line and moves as the center, and described centre of gyration line is parallel with the axis of described driven roller,
Wherein said centre of gyration line is positioned at the second place side place as lower plane, and described plane comprises: the axis of described driven roller; And when described first supporting member is positioned at described primary importance place the axis of described driven voller, and
The described supporting surface of wherein said second supporting member corresponds essentially to around the outer peripheral face of described centre of gyration line as the predetermined cylinder of center drafting.
14. an image recorder comprises:
Sheet material conveyor is transported to support member with sheet-shaped recording medium, and during the image record, described recording medium is placed on the described support member, and described sheet material conveyor comprises:
First delivery section has driven roller and faces the driven voller of arranging with described driven roller, and described first delivery section is carried recording medium towards described support member;
Rotating supporting member rotatably supports described driven voller;
First ways is set to described rotating supporting member and outstanding towards described support member;
First supporting member supports described rotating supporting member movably, makes described driven voller to move and to move away described driven roller towards described driven roller;
The pushing member is arranged between described first supporting member and the described rotating supporting member, and presses described driven voller and described rotating supporting member towards the driven roller thruster; And
Second supporting member, support described first supporting member, make described first supporting member can predetermined primary importance with described primary importance along mobile between the second place at the upstream side place of the throughput direction of described recording medium, during described first delivery section is carried described recording medium, described first supporting member moves to described primary importance, during described first delivery section was not carried described recording medium, described first supporting member moved to the described second place; And
Record head is by ink jet recording method carries out image record on the recording medium of being carried by described sheet material conveyor.
15. an image recorder comprises:
Sheet material conveyor is carried sheet-shaped recording medium along predetermined throughput direction, and described sheet material conveyor comprises:
First delivery section has driven roller and driven voller, and described driven voller and described driven roller are arranged in the face of ground, and rotated when being configured on being pressed in described driven roller drivenly;
Rotating supporting member rotatably supports described driven voller;
Ways is set to described rotating supporting member integratedly, and described ways leader record medium makes described recording medium by the clamp-press part between described driven roller and the described driven voller;
First supporting member supports described rotating supporting member movably, makes described driven voller to move and to move away described driven roller towards described driven roller;
Align member is set to described first supporting member integratedly, and described align member is located the axle of described driven voller with respect to described throughput direction;
The pushing member is arranged between described first supporting member and the described rotating supporting member, and presses described rotating supporting member towards the driven roller thruster; And
Second supporting member, support described first supporting member, make described first supporting member can predetermined primary importance with described primary importance along mobile between the second place at the upstream side place of the throughput direction of described recording medium, during described first delivery section is carried described recording medium, described first supporting member moves to described primary importance, during described first delivery section was not carried described recording medium, described first supporting member moved to the described second place; And
Record head is by ink jet recording method carries out image record on the recording medium of being carried by described sheet material conveyor.
CN2009100046659A 2008-02-29 2009-03-02 Sheet conveying device and image recording apparatus Active CN101519001B (en)

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CN105459635A (en) * 2014-09-25 2016-04-06 兄弟工业株式会社 Image Recording Apparatus
CN105628525A (en) * 2014-11-14 2016-06-01 航天信息股份有限公司 Integrated circuit (IC) card high-speed distortion test device and method thereof
CN106918513A (en) * 2015-12-28 2017-07-04 航天信息股份有限公司 IC-card bend testing apparatus and method
CN107814226A (en) * 2016-09-14 2018-03-20 柯尼卡美能达株式会社 Paper processing device and image formation system
CN109573673A (en) * 2017-09-29 2019-04-05 精工爱普生株式会社 Medium conveying apparatus, image read-out and recording device

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Publication number Priority date Publication date Assignee Title
JPS62215454A (en) * 1986-03-13 1987-09-22 Canon Inc Method of conveying sheet
JPH07214845A (en) * 1994-01-27 1995-08-15 Canon Inc Recorder
JP4415937B2 (en) * 2005-12-27 2010-02-17 ブラザー工業株式会社 Sheet conveying device, image recording device
JP4415964B2 (en) * 2006-03-28 2010-02-17 ブラザー工業株式会社 Image recording device

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Publication number Priority date Publication date Assignee Title
CN105459635A (en) * 2014-09-25 2016-04-06 兄弟工业株式会社 Image Recording Apparatus
CN105459635B (en) * 2014-09-25 2019-08-20 兄弟工业株式会社 Image recording structure
CN105628525A (en) * 2014-11-14 2016-06-01 航天信息股份有限公司 Integrated circuit (IC) card high-speed distortion test device and method thereof
CN106918513A (en) * 2015-12-28 2017-07-04 航天信息股份有限公司 IC-card bend testing apparatus and method
CN107814226A (en) * 2016-09-14 2018-03-20 柯尼卡美能达株式会社 Paper processing device and image formation system
CN109573673A (en) * 2017-09-29 2019-04-05 精工爱普生株式会社 Medium conveying apparatus, image read-out and recording device

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