CN101462651B - Sheet conveyance apparatus and image forming apparatus including the same - Google Patents
Sheet conveyance apparatus and image forming apparatus including the same Download PDFInfo
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- CN101462651B CN101462651B CN 200810185868 CN200810185868A CN101462651B CN 101462651 B CN101462651 B CN 101462651B CN 200810185868 CN200810185868 CN 200810185868 CN 200810185868 A CN200810185868 A CN 200810185868A CN 101462651 B CN101462651 B CN 101462651B
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Abstract
A sheet conveyance apparatus and an image forming apparatus including the same. The sheet conveyance apparatus includes a reference surface extending along a sheet conveyance direction and configured to regulate the position of a side edge of a sheet to be conveyed; a skew conveyance mechanism configured to convey the sheet obliquely so that the side edge of the sheet collides against the reference surface; and a sheet deforming unit configured to deform the side edge of the sheet when the sheet is conveyed toward the reference surface by the skew conveyance mechanism.
Description
Technical field
The present invention relates to a kind ofly for chopping machine, facsimile apparatus, duplicator or have the sheet material conveyor of the compounding machine of several functions, and relate to a kind of image forming apparatus that comprises this sheet material conveyor.
Background technology
The multiple image forming apparatus that has the electro photography type, offset printing (offset printing) type and the inkjet type that comprise that tradition is used.For example, traditional electronic photograph color image forming device comprises a plurality of photosensitive drums that are arranged along a straight line (being called as " tandem type ") or arrange (being called as " rotation ") along circular path.
In the image transfer printing method that tradition is used, the method that is used for the direct transfer printing toner image from photosensitive drums to sheet material is called as " directly transfer printing ".Be used for from photosensitive drums to intermediate transfer member transfer printing toner image, then the method from middle transfer member to sheet material transfer printing toner image is called as " intermediate transfer method ".
Compare with offset printing press, the advantage of electrophotographic image-forming apparatus in recent years do not need to be forme, and is preferred for printing on demand (POD) service, and printing on demand (POD) service according to this can print neatly on a small quantity.Yet in order to reach the task object of expectation, the image forming apparatus that need to be devoted to the POD service has the High Performance that is suitable for the POD service.Like this, the precision of positioning image is the key factor that should be satisfied on sheet material.For example, in being configured to the image forming apparatus that carries out printing on the two sides, image position accuracy comprises the precision that the position between the image that is formed on positive page or leaf and the anti-page or leaf is adjusted.
Position along the position of sheet material throughput direction, along the direction vertical with the sheet material throughput direction, the multiplying power of image and the crooked amount of sheet material are the example factors that impact is formed on the position of the image on the sheet material.Thereby the deviation of eliminating these factors is the key of the accuracy of positioning level that reaches satisfied.
For example, image forming apparatus can carry out the deviation that sheet material transfer position and image multiplying power are eliminated in electric control.Yet it is difficult making power consumption control proofread and correct sheet material crooked.For example, in order to proofread and correct the position that is transferred sheet material, image forming apparatus can be based on the irradiation timing/position of the picture signal electric control laser beam that supplies to photosensitive drums.For example, for the multiplying power of correcting image, image forming apparatus can carry out electric control to the range of exposures of the laser beam that is transmitted into photosensitive drums.
On the other hand, in order to proofread and correct the crooked of sheet material, thereby the tilted image correcting image that electro-detection is transferred the crooked amount of sheet material and electric forming and this inclination sheet material coupling is feasible with respect to the position of sheet material.Yet, in the time of can adjusting the image inclination of every sheet material under image forming apparatus is forming the state of the coloured image that three kinds or four kinds of colors overlap each other, the ink dot of each color forms that difference may depend on the crooked amount of sheet material and the tone that changes the image on every sheet material.In addition, need the inclination of long time computed image.Therefore, the capacity rating of equipment greatly reduces.Thereby, need crooked suitable mechanism or device for the mech c/o sheet material.
Skew corrected mechanism can be divided into roughly with Types Below (perhaps group).
The skew corrected mechanism that belongs to general type comprises a pair of registration roller of the upstream side that is arranged in transfer printing unit, and the crooked amount that is transferred sheet material (being transferred transfer materials) is eliminated by registration roller can touch by the front end that makes sheet material in this skew corrected mechanism under the state that stops roll gap section.The skew corrected mechanism of the type feeding sheets too much after the front end of sheet material arrives the roll gap section of registration roller.Therefore, be deformed under the state of bending (loop) shape being transferred sheet material, can aim at along the roll gap section of registration roller the front end of sheet material, thereby eliminate crooked amount.
The skew corrected mechanism that belongs to another type comprises: calculating unit, and it is configured to calculate based on the inclination of the front end of the sheet material that detects the crooked amount of sheet material; And arrange along the direction vertical with the sheet material throughput direction two driven rollers independently.The skew corrected mechanism of the type changes the delivery speed of each driven roller independently according to the crooked amount of the sheet material of calculating, thereby makes sheet material rotate to eliminate crooked along predetermined direction.
In addition, the skew corrected mechanism that belongs to another type comprises the reference plane that extends along the sheet material throughput direction and towards this reference plane crooked roller of feeding sheets obliquely.This reference plane is so that change the direction (reducing crooked amount) that is transferred sheet material when adjustment is transferred the side of sheet material.
Explanation is configured to utilize reference plane to proofread and correct the exemplary skew corrected mechanism of the direction of sheet material in the side of adjusting sheet material with reference to the accompanying drawings.
Figure 23 A and Figure 23 B show the skew corrected unit of seeing from the sheet material throughput direction, and according to this sheet material throughput direction, sheet material is side shifting backward from the front side of figure.The skew corrected unit comprises skew corrected roller 32 and backer roll 34, and this skew corrected roller 32 and this backer roll 34 can be worked in coordination with and be kept sheet material S and to the reference plane 311 of benchmark guidance unit 31 feeding sheets S obliquely.After sheet material S touched reference plane 311, skew corrected roller 32 and backer roll 34 made sheet material S rotate to change its direction (reducing crooked amount) and begin along reference plane 311 traveling priorities.
Shown in Figure 23 A, when between skew corrected roller 32 and backer roll 34 obliquely during the side of feeding sheets S, by upper guide portion 312 and the lower guide portion 313 guiding sheet material S of benchmark guidance unit 31.Upper guide portion 312 and lower guide portion 313 prevent sheet material S warpage.Be used for by making sheet material side along reference plane change crooked method that its direction proofreaies and correct sheet material following some be favourable.
Form when processing when image forming apparatus carries out image to the pro and con (first page and second page) of sheet material, image forming apparatus (switchback) operation that commutates is to carry out the switching of the front end/rear end of sheet material to first page and second page.In this case, image forming apparatus does not switch the side of sheet material.At the same position place along the direction vertical with the sheet material throughput direction, image forming apparatus carries out similar skew corrected to first page and the second page of sheet material.Therefore, use the skew correction method of reference plane can accurately set image with respect to the starting position of the side of sheet material.Image forming apparatus can form and process or not carrying out the two sides image in the situation that produces any skew between the front of sheet material and the image on the reverse side.
According to the method that is used for carrying out at the front end of sheet material skew corrected, if in the direction generation first page vertical with the sheet material throughput direction and the skew between the image on the second page, then can not proofread and correct this skew.That is to say, even the skew corrected ability is high, the image that is formed on the pro and con of sheet material also may be with respect to the side skew of sheet material.
In POD market, need image forming apparatus comprising that different grammes per square metres (for example are not less than 40g/m
2And be not more than 350g/m
2) the multiple recording materials of common paper, coating sheet material (coatedsheet), film and other special material on carry out image and form.
As mentioned above, typical skew correction method comprise towards reference plane obliquely feeding sheets so that be transferred the side of sheet material and touch reference plane and change the sheet material direction, thereby reduce the crooked amount of sheet material.Yet, need image forming apparatus in recent years to use the polytype sheet material with different-thickness and material.If be transferred sheet material and be thin or made by the material with low rigidity, then may warpage when sheet material touches reference plane.Shown in Figure 23 B, if the rigidity of sheet material S is low, then when sheet material S touches reference plane 311, sheet material S may the gap between upper guide portion 312 and lower guide portion 313 in warpage.
In this case, can not accurately carry out skew corrected, and the image position accuracy on the sheet material is correspondingly deteriorated.In addition, because paperboard may appear in the warpage of sheet material.The side of sheet material may be by damaged or damage.Usually, the gap between upper guide portion 312 and the lower guide portion 313 is configured to larger than the thickness of the thick sheet of being processed by image forming apparatus.Therefore, thus the gap between upper guide portion 312 and the lower guide portion 313 is narrow not can not to prevent the fine sheet warpage.
Therefore, in order to ensure in the situation that do not cause any warpage at feeding sheets under the state of the side of reference plane guiding sheet material, the equipment of discussing in the TOHKEMY 2002-356250 communique comprises for the mechanism according to the gap between guide portion in the thickness adjustment of sheet material and the lower guide portion.When being transferred sheet material and being fine sheet (sheet material that namely has low rigidity), make the legacy equipment of discussing move to reduce gap between upper guide portion and the lower guide portion.Therefore, this equipment can guarantee to guide along reference plane the side of sheet material under the state that prevents the sheet material warpage.
Yet, according to the above-mentioned legacy equipment that is configured to according to the gap between guide portion in the thickness adjustment of sheet material and the lower guide portion, need accurately operation detection unit.Detecting unit be for example can the direct-detection sheet thickness contact type sensor or reflection type optical sensor.The thickness of the displacement detecting sheet material of movable conveying roller when another detecting unit can be based on the clamping sheet material.
Yet, if sheet material carried continuously and non-stop state under carry out the detection of this detecting unit, then except the intrinsic error that is caused by single-sensor and since be transferred sheet material move up and down and the off-centre of each conveying roller causes producing sizable detection magnitude of error (for example near 10%).In addition, the displacement of movable conveying roller detects the method for sheet thickness according to based on the clamping sheet material time, because the displacement of roller is little, therefore is difficult to accurately detect the thickness of fine sheet.
In addition, except the thickness of automatic detection sheet material, there is the method that is used for adjusting based on the sheet thickness information that the user directly inputs the gap between upper guide portion and the lower guide portion.In this case, need the user to input the sheet material thickness information, this information is set on user's possible errors ground.
In addition, compare with sheet thickness, when sheet material touched reference plane, the rigidity of sheet material was the decisive factor that prevents the sheet material warpage.Figure 22 is the drawing a diagram about the relation between sheet thickness and the sheet material rigidity that various sheet materials are shown.As understanding from the data shown in Figure 22, even the thickness of the sheet material of particular type is identical with the thickness of the sheet material of another type, the rigidity of these sheet materials also differs widely.
In addition, as understanding from the chart shown in Figure 22, have following trend: if the thickness of fine sheet changes a little, then its rigidity greatly reduces.Thereby, according to being used for only based on the method in the gap between guide portion in the thickness adjustment of sheet material and the lower guide portion, be difficult to prevent the sheet material warpage.Therefore, if the rigidity of thick sheet is low, then need to make gap turn narrow between guide portion and the lower guide portion to prevent the sheet material warpage.Yet, because not being based on the rigidity of sheet material, above-mentioned legacy equipment do not change guide clearance, therefore, if thick sheet has low rigidity, this equipment can not prevent this thick sheet warpage.In addition, as the concrete mechanism that is used for adjusting the gap between upper guide portion and the lower guide portion, need to be configured to the driver element and the control unit that is configured to control driver element of CD-ROM drive motor.Therefore, the cost of equipment increases.
Summary of the invention
Exemplary embodiments of the present invention provides a kind of sheet material conveyor, this sheet material conveyor can be carried the sheet material of multiple different rigidity and guarantee to proofread and correct in the situation of not using complicated configuration and respectively be transferred the crooked of sheet material, and can prevent sheet material warpage when sheet material touches reference plane.
According to an aspect of the present invention, sheet material conveyor comprises: reference plane, and it extends and is configured to adjust the position of the side of the sheet material that will be transferred along the sheet material throughput direction; Crooked conveying mechanism, it is configured to obliquely feeding sheets, so that the side of sheet material touches reference plane; And the sheet material deformation unit, it is configured to when the side distortion that is made sheet material by crooked conveying mechanism during towards the reference plane feeding sheets.
According to a further aspect in the invention, image forming apparatus comprises: image formation unit, and it is formed at and forms image on the sheet material; And sheet material conveyor, it is configured to the image formation unit feeding sheets, and wherein, this sheet material conveyor comprises: reference plane, it extends and is configured to adjust the position of the side of the sheet material that will be transferred along the sheet material throughput direction; Crooked conveying mechanism, it is configured to obliquely feeding sheets, so that the side of sheet material touches reference plane; And the sheet material deformation unit, it is configured to when the side distortion that is made sheet material by crooked conveying mechanism during towards the reference plane feeding sheets.
To the detailed description of exemplary embodiments, it is obvious that further feature of the present invention and aspect will become by with reference to the accompanying drawings.
Description of drawings
The accompanying drawing that is included in the specification sheets and consists of the part of specification sheets shows exemplary embodiments of the present invention and feature with specification sheets, is used for explaining at least some principles of the present invention.
Fig. 1 illustrates the lateral plan of exemplary askew correcting apparatus according to an exemplary embodiment of the present invention.
Fig. 2 illustrates the block diagram of askew correcting apparatus shown in Figure 1.
Fig. 3 illustrates the amplification view of benchmark guidance unit shown in Figure 1.
Fig. 4 A and Fig. 4 B are the enlarged drawings that the exemplary operation state of benchmark guidance unit shown in Figure 3 is shown.
Fig. 5 is the birds-eye view that askew correcting apparatus shown in Figure 1 is shown.
Fig. 6 illustrates the birds-eye view of askew correcting apparatus shown in Figure 1.
Fig. 7 illustrates the cutaway view of the example images forming device that comprises askew correcting apparatus according to an exemplary embodiment of the present invention.
Fig. 8 A to Fig. 8 D illustrates the birds-eye view of exemplary positioning unit shown in Figure 7.
Fig. 9 is the chart that according to an exemplary embodiment of the present invention geometrical moment of inertia (geometrical moment of inertia), sheet thickness, the steering level exemplary relation between poor is shown.
Figure 10 is the block diagram that illustrates according to the exemplary askew correcting apparatus of the second exemplary embodiments of the present invention.
Figure 11 illustrates the lateral plan according to the exemplary askew correcting apparatus of the 3rd exemplary embodiments of the present invention.
Figure 12 illustrates the lateral plan according to the exemplary askew correcting apparatus of the 4th exemplary embodiments of the present invention.
Figure 13 is the block scheme according to the exemplary control system of the 4th exemplary embodiments of the present invention.
Figure 14 is the diagram of circuit that the exemplary operation that is undertaken by control system shown in Figure 13 is shown.
Figure 15 illustrates the front view according to the exemplary askew correcting apparatus of the 5th exemplary embodiments of the present invention.
Figure 16 illustrates the block diagram of askew correcting apparatus shown in Figure 15.
Figure 17 illustrates the amplification stereogram of askew correcting apparatus shown in Figure 16.
Figure 18 A is the front view that illustrates when the exemplary status of ground paper during by askew correcting apparatus shown in Figure 15.
Figure 18 B is the front view that illustrates when the exemplary status of thin paper during by askew correcting apparatus shown in Figure 15.
Figure 19 is the block scheme that illustrates be used to the exemplary control unit of controlling askew correcting apparatus shown in Figure 15.
Figure 20 is the diagram of circuit that the exemplary operation that is undertaken by control unit shown in Figure 19 is shown.
Figure 21 A is the front view that illustrates when the exemplary status of ground paper by according to the askew correcting apparatus of the 6th exemplary embodiments of the present invention the time.
Figure 21 B is the front view that illustrates when the exemplary status of thin paper by according to the askew correcting apparatus of the 6th exemplary embodiments of the present invention the time.
Figure 22 is the chart that the exemplary relation between sheet thickness and the rigidity is shown.
Figure 23 A and Figure 23 B illustrate traditional askew correcting apparatus of seeing from the sheet material throughput direction.
The specific embodiment
The below is exemplary to the explanation essence of exemplary embodiments, rather than will limit the present invention and application or use.It will be the part of implementation explanation when the methods known to those skilled in the art, technology, equipment and system are suitable.Should be noted that in whole specification sheets, use with the following drawings in similarly Reference numeral and the similar element of letter representation, thereby in case an element has been described in a width of cloth figure, can no longer discuss among the figure below.Explain below with reference to accompanying drawings exemplary embodiments.
Below with reference to the electrophotographic image-forming apparatus 1 of Fig. 7 explanation according to exemplary embodiments.
From the sheet material S of sheet feeding unit 12 feedings by being arranged on the transport path the supply unit 20 and arriving positioning unit 30.Positioning unit 30 comprises askew correcting apparatus, and this askew correcting apparatus is configured to every sheet material S is carried out skew corrected and is used for making the sheet material S correction of timing synchronous with the image transfer operation that is undertaken by the secondary transfer printing unit.Positioning unit 30 is to secondary transfer printing unit feeding sheets S.
The secondary transfer printing unit comprises toward each other to form inside secondary transfer roller 43 and the outside secondary transfer roller 44 of transfer nip section.By applying predetermined stress and static load biasing (electrostatic load bias), the secondary transfer printing unit can be transferred to sheet material S from middle transfer belt 40 with toner image (the not image of photographic fixing).The following describes and be used to form and be transferred to the toner image of sheet material and the example images forming process of carrying this sheet material to the secondary transfer printing unit.
In Fig. 7, image forms mechanism 90 and comprises photosensitive drums 91, exposure device 93, developing cell 92, primary transfer unit 45 and photosensitive drums cleaner 95.The light that sends from exposure device 93 based on image information signal is reflected unit 94 reflections and arrives the surface and is recharged unit in advance uniform charging and the photosensitive drums 91 of rotating in the counterclockwise direction.Thereby, form electrostatic latent image on the surface of photosensitive drums 91.Developing cell 92 carries out toner development to be processed, and processes according to this toner development, and to make the lip-deep latent electrostatic image developing of photosensitive drums 91 be toner image by toner coated.Then, primary transfer unit 45 applies predetermined stress and the biasing of static load, toner image is transferred to intermediate transfer belt 40.Photosensitive drums cleaner 95 is collected the lip-deep toner particle that remains in photosensitive drums 91.
Above-mentioned image forms the image formation unit that mechanism 90 comprises yellow (Y), magenta (M), cyan (C) and four kinds of colors of black (Bk), the sum of color is not limited to four kinds, and the configuration sequence of color is not limited to Y → M → C → Bk.
Around driven roller 42, idler roller 41 and inner secondary transfer roller 43 tensioning intermediate transfer belts 40.When being driven by a motor, intermediate transfer belt 40 rotates along the direction shown in the arrow B.Each color image that forms in the processing arranged side by side that is superposeed in turn to the upstream toner image of intermediate transfer belt 40 by primary transfer by above-mentioned Y, M, C and Bk image formation unit.As a result, on intermediate transfer belt 40, finally form full-color toner image, and this full-color toner image is transported to the secondary transfer printing unit.
Carry and image forming course by above-mentioned sheet material, the secondary transfer printing unit can be with the full-color toner image secondary transfer printing on sheet material S.Collect the lip-deep toner particle that remains in intermediate transfer belt 40 with cleaner 46.
After image was arrived sheet material S by secondary transfer printing, pre-photographic fixing feedway 51 was transported to fixation unit 50 with sheet material S.Fixation unit 50 comprises toward each other sheet material S applied predetermined stressed roller or band and to be used for heating sheet material S with the thermal source (for example halogen heater) at sheet material S fusing and fusing toner.Photographic fixing the sheet material S of image arrive branch's feedway 60, this branch's feedway 60 directly is discharged to sheet material with sheet material S and discharges pallet 61, if perhaps equipment carries out the two sides image and forms and process, then sheet material S is transported to overturn conveying apparatus 70.
Overturn conveying apparatus 70 carries out for the front/back of upset sheet material S and switches the switch operation of front end/rear end of sheet material S.Then, sheet material S arrives two sides feedway 80.Two sides feedway 80 make sheet material S avoid with the state of interfering from other sheet material S of sheet feeding apparatus 10 feedings under enter supply unit 20.When sheet material S arrives the secondary transfer printing unit again, with the identical mode of the above-mentioned processing of the first page of sheet material S is carried out image to second page form and process.
Askew correcting apparatus comprises movable guide portion 55 and fixed guide section 33.Movable guide portion 55 can be mobile along sheet width direction (i.e. the direction vertical with the sheet material throughput direction) according to the size of sheet material S.But movable guide portion 55 comprises a plurality of skew corrected roller 32a, 32b, 32c and backer roll 34a, 34b, the 34c that benchmark guidance unit 31 one move.Backer roll 34a, 34b and 34c can be to skew corrected roller 32a, 32b and 32c pressurizations.The function of the conveying guide portion that sheet material S uses can play in the fixed guide section 33 that is fixed to device framework.
Below with reference to the detailed configuration of Fig. 1 to Fig. 5 explanation according to the askew correcting apparatus of the first exemplary embodiments.Fig. 1 illustrates the lateral plan of the askew correcting apparatus of seeing from the direction vertical with the sheet material throughput direction.Fig. 2 illustrates the block diagram of the askew correcting apparatus of seeing from the top position that tilts.Fig. 3, Fig. 4 A and Fig. 4 B are the partial enlarged drawings of Fig. 1.Fig. 5 illustrates the birds-eye view of askew correcting apparatus shown in Figure 1, and this figure does not comprise the upper guide portion 312 of benchmark guidance unit 31.
As depicted in figs. 1 and 2, the benchmark guidance unit 31 of askew correcting apparatus has groove shape (U font) cross section.Benchmark guidance unit 31 comprises reference plane 311, as the upper guide portion 312 of the first guide portion with as the lower guide portion 313 of the second guide portion.Reference plane 311 is proofreaied and correct the direction of sheet material to eliminate crooked amount in the side of guiding sheet material.Reference plane 311 has the location or adjusts the function of the side of sheet material.
As shown in Figure 5, skew corrected roller 32a, 32b and 32c (as crooked conveying mechanism) tilt with respect to the angled α of sheet material throughput direction ground.Skew corrected roller 32a, 32b and 32c are towards the reference plane 311 of benchmark guidance unit 31 feeding sheets obliquely, so that the side of sheet material touches reference plane 311 obliquely.Then, skew corrected roller 32a, 32b and 32c are transferred feeding sheets under the state of side of sheet material in reference plane 311 guiding.
As shown in Figure 5, CD-ROM drive motor 322 via Timing Belt 323,324 and 325 and shaft Coupling 321a, 321b and 321c drive skew corrected roller 32a, 32b and the 32c that arranges along the sheet material throughput direction.The actuating speed that this configuration has reduced between each skew corrected roller 32a, 32b and the 32c effectively is poor.
Fig. 1 to Fig. 6 illustrates the exemplary sheet material deformation unit of the side bending that is configured to make sheet material when sheet material touches reference plane 311.As shown in Figure 1, lower guide portion 313 has the recess 314 that is arranged in along a plurality of (being " two " according to the embodiment that illustrates) position of sheet material throughput direction.Recess 314 has the smooth side continuous with the sheet material conveyor surface 313a of lower guide portion 313.Thereby the front end that is transferred sheet material can easily pass through recess 314.
Bulbous member 35 (35a and 35b) is by making such as low friction resin materials such as polyacetal resins (POM), and this bulbous member 35 (35a and 35b) is the light weight member that can suitably pressurize and be transferred sheet material S.In exemplary embodiments, the weight of each bulbous member 35 is 1g.Can use elastic component (for example spring) that bulbous member 35 (35a and 35b) is applied elastic force, so that bulbous member 35 can be outstanding from sheet material conveyor surface 312a definitely.
According to above-mentioned configuration, if the rigidity of sheet material Sn low (referring to Fig. 4 A), then the side of sheet material Sn is in the distortion of part place or the bending that are sandwiched between bulbous member 35 and the recess 314.The side of sheet material Sn is deformed into along the waveform shape of sheet material throughput direction extension and touches reference plane 311.In other words, the convex that is formed by bulbous member 35 and can make the side of sheet material be deformed into waveform shape by the concavity that the recess 314 of correspondence forms.
Shown in Fig. 4 B, if the rigidity of sheet material Sk is high, then by the sheet material Sk shape member 35 (35a and 35b) of upwards pushing the ball, and bulbous member 35 remained on the position that sheet material Sk can contact with reference plane 311 when keeping straightened condition.The amount of movement of bulbous member 35 (35a and 35b) and the rigidity of sheet material are proportional.In other words, the deflection of sheet material can change according to the rigidity of sheet material.When the rigidity of sheet material was high, the deflection of sheet material reduced.
In exemplary embodiments, the clearance G 1 between the sheet material conveyor surface 313a of the sheet material conveyor surface 312a of upper guide portion 312 and lower guide portion 313 (being that base portion shown in Figure 3 is to the gap of base portion) is configured to 1mm.(grammes per square metre is 350g/m by the thick sheet of processing according to the image forming apparatus of exemplary embodiments
2Sheet material) thickness be 0.4mm.Therefore, consider because paperboard or the curling setting of determining clearance G 1 that the difference of sheet thickness causes.The diff-H G2 of the error of perpendicular between the sheet material conveyor surface 313a of the lower guide portion 313 of expression and the bottom surface of recess 314 is set to 1mm.
Usually, the warpage of sheet material and geometrical moment of inertia I are proportional.For example, be 40g/m if work as grammes per square metre
2And thickness is the sheet material distortion of 0.05mm or the high deformation that produces 2mm when bending to waveform shape, and then geometrical moment of inertia I becomes about 6300 times of value under the flat condition.Thereby, obviously surpass thick sheet (the geometrical moment of inertia I of thickness=0.4mm).
Fig. 9 illustrates the diff-H of sheet material distortion and the chart of the exemplary relation between the geometrical moment of inertia I.In Fig. 9, the value representation geometrical moment of inertia I on the transverse axis.Solid line represents the geometrical moment of inertia I that the sheet thickness " t " according to common paper changes.Dotted line represents that (thickness " t "=0.05mm) is deformed into the geometrical moment of inertia I of the common paper that the diff-H " a " of waveform shape changes according to sheet material.
As understanding from relation shown in Figure 9, if sheet material suitably is out of shape, then geometrical moment of inertia I can be increased to enough values.Even when the rigidity of sheet material was hanged down, the warpage that prevents sheet material also was feasible.Guarantee in the situation that do not produce any paperboard or crooked be feasible to the reference plane feeding sheets.
Therefore, even the rigidity of sheet material Sn is low, if the side of sheet material Sn, then can improve the rigidity (buckling force) of the edge of the sheet material Sn direction vertical with the sheet material throughput direction along reference plane 311 waveform shape (Fig. 4 A) that the sheet material throughput direction extends that remains along.Therefore, when the low sheet material of rigidity touched reference plane 311, this sheet material can warpage.
The deflection of sheet material (diff-H of the distortion of waveform shape) changes according to the rigidity of sheet material.When the rigidity of sheet material was high, deflection was little and transporting resistance is little.Therefore, the sheet material that rigidity is low produces large deformation.Variant part has improved the rigidity of sheet material and has prevented the sheet material warpage.Sheet material with high stiffness produces small deformation and little conveying friction force.Thereby device is feeding sheets reposefully.Therefore, device can accurately carry out skew corrected.
Has the high delivery speed of delivery speed than the skew corrected roller that is arranged in upstream side if be arranged in the skew corrected roller in downstream, then because downstream skew corrected roller pulling-on piece material and in the significant tensile stress of sheet material effect, so the waveform shape of sheet material may weaken or disappear.As a result, the effect of the rigidity of raising sheet material reduces.
Therefore, as shown in Figure 6, be configured to have respectively different angle of skew α a, α b and α c according to skew corrected roller 32a, 32b and the 32c of exemplary embodiments.The skew corrected roller that is arranged in the downstream has the angle of skew larger than the angle of skew of the skew corrected roller that is arranged in upstream side, and (α c＞α b＞α a).Therefore, the skew corrected roller that is arranged in the downstream has the speed component along the sheet material throughput direction less than the speed component along the sheet material throughput direction of the skew corrected roller that is arranged in upstream side.Tolerance each skew corrected roller 32a, 32b of external diameter and the angle of skew of 32c are considered in expectation, to guarantee along the relation of the above-mentioned speed component of sheet material throughput direction.
In exemplary embodiments, the sheet material feed angle (angle of skew) of each skew corrected roller 32a, 32b and 32c is configured to satisfy above-mentioned relation.Thereby the skew corrected roller that is arranged in the downstream has the speed component along sheet material throughput direction less than the speed component along the sheet material throughput direction of the skew corrected roller that is arranged in upstream side.Yet, the invention is not restricted to above-described embodiment.
For example, in another exemplary embodiments, the skew corrected roller that is arranged in the downstream has the little external diameter of external diameter than the skew corrected roller that is arranged in upstream side.In another exemplary embodiments, CD-ROM drive motor drives skew corrected roller 32a, 32b and 32c independently.The delivery speed of downstream skew corrected roller is configured to slower than the delivery speed of upstream skew corrected roller.
In order to prevent from having the sheet material warpage of low rigidity, expectation is near reference plane 311 location bulbous member 35a and 35b.Therefore, in exemplary embodiments, bulbous member 35a and 35b are disposed on the guide portion 312.Yet bulbous member 35a and 35b can be disposed in any position between skew corrected roller 32a, 32b and 32c and the reference plane 311.Therefore, can consider the configuration of supported material and device and suitably determine the setting position of bulbous member 35a and 35b.Can increase or reduce according to the configuration of supported material and device the quantity of skew corrected roller, recess and bulbous member.
Fig. 8 A to Fig. 8 D illustrates the exemplary sheet material alignment function that is undertaken by positioning unit 30.At first, shown in Fig. 8 A, askew correcting apparatus receives the sheet material S with the angle beta inclination.Sheet material conveying roller 21 is to skew corrected roller 32a, 32b and 32c feeding sheets S.Shown in Fig. 8 B, skew corrected roller 32a, 32b and 32c are towards benchmark guidance unit 31 feeding sheets S obliquely.
In this case, before skew corrected roller 32a began feeding sheets S, the actuator (not shown) made sheet material conveying roller 21 discharge the Clamping force that is applied on the sheet material S.Then, shown in Fig. 8 C, the side of sheet material S touches the reference plane 311 of benchmark guidance unit 31 and rotates (changing its direction) to eliminate crooked amount.Adjust at reference plane 311 under the state of position of the edge of the sheet material S direction vertical with the sheet material throughput direction, sheet material S is to registration roller 37 traveling priorities.
When sheet material S arrived registration roller 37, sheet material S was maintained at clamp position.The actuator (not shown) makes backer roll 34a, the 34b relative with 32c with skew corrected roller 32a, 32b and 34c discharge the Clamping force that is applied on the sheet material S.Then, shown in Fig. 8 D, under the state of registration roller 37 clamping sheet material S, registration roller 37 slides along the direction vertical with the sheet material throughput direction.
Thereby registration roller 37 has the function that the position of adjusting sheet material S makes the images match on this position and the intermediate transfer belt 40.In this case, benchmark guidance unit 31 is adjusted the position of the side of sheet material.Therefore, device makes registration roller 37 move along the direction vertical with the sheet material throughput direction based on the distance from benchmark guidance unit 31.Then, registration roller 37 is to secondary transfer printing unit feeding sheets S.
Figure 10 illustrates the askew correcting apparatus of seeing from the oblique upper position according to the second exemplary embodiments of the present invention.Except the second exemplary embodiments replaces as the bulbous member 35a and 35b of protrusion with column roller 38a and 38b, the askew correcting apparatus shown in Figure 10 is with similar according to the askew correcting apparatus of the first exemplary embodiments.
Similar with bulbous member 35a and 35b, when having sheet material between column roller 38a and 38b and the recess 314, column roller 38a and 38b have the function of the side distortion of the low sheet material of the rigidity of making.The distortion side of sheet material has improved the rigidity of sheet material.This device can guarantee to carry out skew corrected.Have higher rigidity if be transferred sheet material, then sheet material pushes away column roller 38a and 38b and column roller 38a and 38b is moved up.Thereby, can carry out the similar skew corrected of skew corrected of carrying out with askew correcting apparatus according to the first exemplary embodiments according to the askew correcting apparatus of the second exemplary embodiments.
Compare with the configuration that support rotating bulbous member 35a and 35b are required, simple with the configuration that the turning cylinder of groove (otch) support drum roller 38a and 38b is required. Make column roller 38a and 38b and do not need high precision.Therefore, the low cost of manufacture of column roller 38a and 38b.
Figure 11 illustrates the exemplary askew correcting apparatus according to the 3rd exemplary embodiments of the present invention.Compare with the first exemplary embodiments, askew correcting apparatus shown in Figure 11 comprises from the outstanding a plurality of lower guide reel 39 of the sheet material conveyor surface 313a of lower guide portion 313 and do not comprise recess 314 on the sheet material conveyor surface 313a of lower guide portion 313.Lower guide reel 39 can rotate along the sheet material throughput direction.The configuration that illustrates in other configuration and the first exemplary embodiments is similar.
In the 3rd exemplary embodiments, two lower guide reels 39 are positioned in upstream side and the downstream along the sheet material throughput direction of each bulbous member 35 (35a and 35b).In other words, a pair of lower guide reel 39 forms roughly recess at the sheet material conveyor surface 313a of lower guide portion 313.When from the side, lower guide reel 39 and bulbous member 35a and 35b are arranged to staggered.Therefore, the convex that is formed by bulbous member 35 (35a or 35b) and the concavity that is formed by a pair of lower guide reel 39 can make the side of sheet material be deformed into waveform shape.
Thereby, if it is low to carry out the rigidity of sheet material of skew corrected, then adjust under the state of position of the edge of the sheet materials direction vertical with the sheet material throughput direction at reference plane 311, the side of sheet material is deformed into waveform shape between lower guide reel 39 and bulbous member 35a and 35b.Therefore, device can carry out skew corrected to being transferred sheet material when preventing the sheet material warpage.
In the askew correcting apparatus according to the 3rd exemplary embodiments, when be transferred sheet material by lower guide reel 39 and bulbous member 35a and 35b between the time, lower guide reel 39 can rotate along the sheet material throughput direction reposefully with bulbous member 35a and 35b.Therefore, can reduce to act on friction force on the sheet material according to the askew correcting apparatus of the 3rd exemplary embodiments, and can accurately carry out skew corrected.
Figure 12 illustrates the exemplary askew correcting apparatus according to the 4th exemplary embodiments of the present invention.Askew correcting apparatus shown in Figure 12 can be in the situation that benchmark guidance unit 31 comprise that the sheet material delivery speed of each skew corrected roller of waveform construction control is so that the side of sheet material is deformed into waveform shape.The configuration that illustrates in other configuration and the first exemplary embodiments is similar.
Be controlled so as to as CD-ROM drive motor M1, the M2 of the drive source of skew corrected roller 32a, 32b and 32c and M3 (Figure 13) skew corrected roller 32a, 32b and 32c are rotated independently.Can detect the sheet material detecting sensor 330a, the 330b that are transferred sheet material and 330c and be arranged to roll gap section near skew corrected roller 32a, 32b and 32c.
Shown in the controlling party block diagram of Figure 13, controller C with drive respectively skew corrected roller 32a, 32b and be connected CD-ROM drive motor M1, M2 with 32c and be connected drive source with M3) be connected.Controller C transmits control signal to CD-ROM drive motor M1, M2 and M3.Controller C receives from sheet material detecting sensor 330a, the 330b that can detect respectively the sheet material that is transported to skew corrected roller 32a, 32b and 32c and the signal of 330c.
Utilize above-mentioned configuration, when sheet material arrived the roll gap section of skew corrected roller 32a, 32b and 32c, controller C can detect sheet material based on the detection signal from sheet material detecting sensor 330a, 330b and 330c.Controller C controls in turn CD-ROM drive motor M1, M2 based on the testing result of these sensors and M3 begins to rotate.Therefore, skew corrected roller 32a, 32b and 32c begin to rotate in turn.
Figure 14 is the diagram of circuit that the exemplary process of being undertaken by controller C is shown.
In step S1, controller C begins skew corrected control.In step S2, controller C judges whether sheet material detecting sensor 330a detects sheet material.If sheet material detecting sensor 330a detects sheet material (being yes) in step S2, then process and advance to step S3.
In step S3, controller C makes CD-ROM drive motor M1 begin to rotate.The continuous feeding sheets of skew corrected roller 32a by driven motor M1 driving.
In step S4, controller C judges whether sheet material detecting sensor 330b detects the sheet material of being carried by skew corrected roller 32a.If sheet material detecting sensor 330b detects this sheet material (being yes) in step S4, then process and advance to step S5.In step S5, controller C makes CD-ROM drive motor M2 begin to rotate.The continuous feeding sheets of corrector roll 32b by driven motor M2 driving.In this case, life period is poor between the timing that is detected sheet material by sheet material detecting sensor 330b and CD-ROM drive motor M2 begin to rotate with the timing of feeding sheets.Therefore, sheet material is temporary transient slack-off or temporarily stop.
In step S6, controller C judges whether sheet material detecting sensor 330c detects the sheet material of being carried by skew corrected roller 32b.If sheet material detecting sensor 330c detects this sheet material (being yes) in step S6, then process and advance to step S7.In step S7, controller C makes CD-ROM drive motor M3 begin to rotate.The continuous feeding sheets of corrector roll 32c by driven motor M3 driving.In this case, sheet material detecting sensor 330c detect the timing of sheet material and CD-ROM drive motor M3 begin to rotate with the timing of feeding sheets between life period poor.
Therefore, sheet material is temporary transient slack-off or temporarily stop.When skew corrected roller 32a, 32b and 32c began to rotate in turn, sheet material carries with being tilted so that the side of sheet material touches reference plane 311, thereby eliminated the crooked amount of sheet material.
As mentioned above, life period postpones when among skew corrected roller 32a, 32b and the 32c each begins to rotate.Thereby the constant time lag when CD-ROM drive motor begins to rotate is compared in the timing when detecting sheet material by the sheet material detecting sensor.Therefore, when by skew corrected roller clamping sheet material, be transferred sheet material slack-off, perhaps before by skew corrected roller clamping sheet material, be transferred sheet material and stop.
Therefore, under the state that temporarily slows down between skew corrected roller 32a, 32b and the 32c or stop, the side of this sheet material is deformed into waveform shape at the sheet material with low rigidity.The side of waveform has improved the rigidity of sheet material.Therefore, even sheet material has low rigidity, this device also can be guaranteed to carry out skew corrected and can not produce any warpage when sheet material touches reference plane 311 being transferred sheet material.
On the other hand, have high rigidity (for example, thick sheet) if be transferred sheet material, then sheet material can slide and can not produce any distortion in the roll gap section of roller.In exemplary embodiments, sheet material detecting sensor 330a, 330b and 330c can be disposed in corresponding skew corrected roller 32a, 32b and the upstream side of 32c.
The result of a measurement that each skew corrected roller can be controlled so as to based on timer (timer) begins to rotate, and this timer is configured to measure each sensor and detects the sheet material schedule time afterwards.In this case, the time required with detected afterwards sheet material arrival of sheet material skew corrected roller by sensor is compared, and the timing when device can begin to rotate by delay skew corrected roller makes and is transferred the sheet material distortion.By repeating in succession aforesaid operations, device can make the side of sheet material be deformed into waveform shape.
Be deformed into the other method of waveform shape as the side that makes sheet material, can control the circumferential velocity of each skew corrected roller 32a, 32b and 32c, so that it is slower than the circumferential velocity of the skew corrected roller that is arranged in upstream side to be arranged in the circumferential velocity of skew corrected roller in downstream.
Like this, device can make the side of sheet material be deformed into waveform shape by the rotation of controlling each skew corrected roller.Device can guarantee to carry out skew corrected.As mentioned above, device can form waveform shape by the rotating speed of only controlling each skew corrected roller.Thereby, compare with the device that uses roller, can eliminate the generation of paperboard according to the device of the present embodiment.
Although the reference plane 311 of benchmark guidance unit 31 is partly cut away, but, Figure 15 is the cutaway view that illustrates according to the askew correcting apparatus that comprises bending unit of the 5th exemplary embodiments of the present invention, and this bending unit is constructed such that the side distortion that the edge of the paper direction parallel with the sheet material throughput direction extended.Figure 16 is the block diagram that the askew correcting apparatus of seeing from the oblique upper position is shown.Figure 17 is the block diagram that the amplification configuration of askew correcting apparatus shown in Figure 16 is shown.In Figure 16 and Figure 17, reference plane 311 is removed the state that sheet material is shown with clear.
As shown in figure 17, to be transferred sheet material in order guiding, on the upper surface of the lower surface of upper guide portion 312 and lower guide portion 313, flexible plate- like guiding elements 312a and 313a to be set respectively.Compare with the material of the guide surface of lower guide portion 313 with upper guide portion 312, flexible plate- like guiding elements 312a and 313a are made by the expandable material that has than low-friction coefficient.Upper guide portion 312 and lower guide portion 313 have the inclined lead part 312b that is configured to guide the sheet material in the gap that is inserted between guide portion 312 and the lower guide portion 313 and the end (open end) of 313b.As shown in figure 17, the end that is positioned in inclined lead part 312b and 313b side of tabular guiding elements 312a and 313a is lower than the summit of inclined lead part 312b and 313b respectively.
It is relative along the sheet material throughput direction with the position that tabular guiding elements 313a is deformed into concavity that tabular guiding elements 312a is deformed into the position of convex.It is relative along the sheet material throughput direction with the position that tabular guiding elements 313a is deformed into convex that tabular guiding elements 312a is deformed into the position of concavity.
The interval along throughput direction of protruding member 320 is set to about 40mm.The actuator (not shown) can drive each protruding member 320.Protruding member 320 can mobile along the vertical direction scheduled volume.
(be hereinafter referred to as " ground paper by operation ") in the operation for delivery of ground paper, device is set as 0mm with protruding member 320 from the overhang of the lower surface of upper guide portion 312.In addition, device is set as 0mm with protruding member 320 from the overhang of the upper surface of lower guide portion 313.In other words, device is positioned at the At The Height identical with the guide surface of upper guide portion 312 and lower guide portion 313 with the jag of tabular guiding elements 312a and 313a.In this case, tabular guiding elements 312a and 313a are smooth.
The position of corresponding protruding member 320 is set in lower guide portion 313, upper tabular guiding elements 312a is fixed to upper guide portion 312.Similarly, the position of corresponding protruding member 320 is set in upper guide portion 312, lower tabular guiding elements 313a is fixed to lower guide portion 313.
Figure 15, Figure 18 A and Figure 18 B are the front views of the benchmark guidance unit 31 seen from the direction vertical with the sheet material throughput direction.Figure 18 A is illustrated in ground paper by the exemplary status of the benchmark guidance unit 31 in the operation.Figure 15 and Figure 18 B illustrate the exemplary status of the benchmark guidance unit 31 that (is hereinafter referred to as " thin paper is by operation ") when carrying thin paper.
Shown in Figure 18 A, when the sheet material that has higher stiffness or rigidity and anti-warpage such as common paper or ground paper etc. was carried out skew corrected, protruding member 320 was not outstanding from guide surface.Therefore, device can with the linear state feeding sheets under less transporting resistance, suppress to carry bad simultaneously.
Shown in Figure 15 and Figure 18 B, when device carried out skew corrected to the sheet material with relatively low stiffness or rigidity, device was set as about 3mm with protruding member 320 from the overhang of upper guide portion 312 and lower guide portion 313.The user can change this overhang.
When protruding member 320 was outstanding from the guide surface of upper guide portion 312 and lower guide portion 313, tabular guiding elements 312a and 313a kept the waveform shape shown in Figure 15 and Figure 18 B.Under this state, if the sheet material with relatively low stiffness or rigidity during by the gap between guiding elements 312a and the 313a, sheet material is deformed into the waveform shape corresponding with tabular guiding elements 312a and 313a.Thereby device can improve the rigidity of sheet material in feeding sheets.
Figure 19 is the block scheme that illustrates according to the exemplary control unit of exemplary embodiments.Controller 500 comprise central process unit (CPU) 501, can stored program read-only memory (ROM) (ROM) 503, I/O (I/O) interface 504 that can temporarily store the random access memory (RAM) 502 of data and can be used as communication interface work.Controller 500 receives the user via the thick information of paper of the sheet material S of operating unit 112 inputs, perhaps via the detection signal (that is, the signal of the thickness of identification sheet material S) of analog/digital (AD) converting unit 505 receptions from the thick detecting sensor 111 of paper.Controller 500 activates screw actuator 106 based on the thick information of the paper that receives via actuator 506, to drive protruding member 320.
For example, if sheet material S is ground paper, then controller 500 does not activate screw actuator 106.In this case, tabular guiding elements 312a and tabular guiding elements 313a are not along the vertical direction from the outstanding smooth guide surface of upper guide portion 312 and lower guide portion 313.If sheet material S is thin paper, then controller 500 activates screw actuator 106, so that tabular guiding elements 312a and 313a form the waveform guide surface.Although it is unspecified,, for image forming apparatus, controller 500 also carries out other control operation.
Figure 20 is the diagram of circuit that the exemplary operation of the driving protruding member 320 that is undertaken by controller 500 is shown.In step S11, the response user is via the sheet material information of operating unit 112 input (for example, the thick and antiquarian of the paper of sheet material S), and controller 500 begins for the predetermined process of printing.In step S12, controller 500 makes the thick detecting sensor 111 of the paper that is arranged in the supply unit 20 detect the thickness of sheet material S.
In step S13, whether controller 500 is judged from the output valve of the thick detecting sensor 111 of paper consistent with the thick information of paper of user's input.If the output valve from ground paper detecting sensor 111 consistent with the thick information of paper (being yes in step S13) is then processed and is advanced to step S14.
In step S14, controller 500 judges whether sheet material S is ground paper.If sheet material S is ground paper (being yes in step S14), then processes and advance to step S15.
In step S15, controller 500 disconnects screw actuator 106 to form smooth guide surface.Then, controller 500 makes image forming apparatus begin printing.If sheet material S is thin paper (being no in step S14), then processes and advance to step S16.In step S16, controller 500 is connected screw actuator 106 to form the waveform guide surface.
If from the output valve and the thick information inconsistency of paper (being no in step S13) of inputting via operating unit 112 of the thick detecting sensor 111 of paper, then process and advance to step S17.In step S17, controller 500 make operating unit 112 display notification users by between the output valve of the sheet material information of user input and the thick detecting sensor 111 from paper relatively in the unmatched result's of appearance indication (perhaps message).
In step S18, controller 500 judges whether the user selects to force to print.According to exemplary embodiments, image forming apparatus allows the user to change the thick information of paper or indication is carried out print processing in the situation that do not change any information.For example, considering the environment for use of machine or the humidity of sheet material, even when sheet material is ground paper, is actv. if improve sheet material skew corrected ability by formation waveform guide surface, and then the user indicates and forces to print.
Figure 21 A and Figure 21 B illustrate the exemplary askew correcting apparatus according to the 6th exemplary embodiments of the present invention.
Shown in Figure 21 A, be divided into a plurality of directing plates in the gap certain along the configuration of sheet material throughput direction and interval as the upper guide portion 312 of a pair of up and down guiding elements and lower guide portion 313.The split position of the split position of upper guide portion 312 and lower guide portion 313 staggers.In exemplary embodiments, the median plane of upper directing plate is to the gap between the lower directing plate.
The actuator (not shown) can change along the gap between the directing plate of sheet material throughput direction configuration. Tabular guiding elements 312a and 313a have the part that is fixed to directing plate.In order to make tabular guiding elements 312a be deformed into waveform shape, the actuator (not shown) makes the directing plate of guide portion 312 move along the sheet material throughput direction, to reduce the gap between the directing plate.Similarly, be deformed into waveform shape in order to make tabular guiding elements 313a, the actuator (not shown) makes the directing plate of lower guide portion 313 move along the sheet material throughput direction, to reduce the gap between the directing plate.
According to the movement of the directing plate of upper guide portion 312, because tabular guiding elements 312a partly is fixed to each directing plate of upper guide portion 312, therefore, tabular guiding elements 312a is deformed into waveform shape (referring to Figure 21 B).Being arranged on tabular guiding elements 313a on the lower guide portion 313 has with the configuration that is arranged on the tabular guiding elements 312a on the upper guide portion 312 and similarly configures.The split position of lower guide portion 313 is the mid point of the directing plate of close upper guide portion 312 respectively.
Therefore, shown in Figure 21 B, it is relative along the sheet material throughput direction with the position that tabular guiding elements 313a is deformed into concavity that tabular guiding elements 312a is deformed into the position of convex.In addition, it is relative along the sheet material throughput direction with the position that tabular guiding elements 313a is deformed into convex that tabular guiding elements 312a is deformed into the position of concavity.Like this, the tabular guiding elements 313a on the lower guide portion 313 and the tabular guiding elements 312a on the upper guide portion 312 correspondingly are out of shape, to form the waveform sheet material path with certain interval between tabular guiding elements 313a and tabular guiding elements 312a.Therefore, the 6th exemplary embodiments can obtain and the similar effect of the effect of the 5th exemplary embodiments.
Application of the present invention is not limited to above-mentioned electrophotographic image-forming apparatus.The present invention can be applied to other (for example, inkjet type or thermal transfer type) image forming apparatus.
Although with reference to exemplary embodiments the present invention has been described, should be appreciated that, the invention is not restricted to disclosed exemplary embodiments.The scope of appended claims will meet the widest explanation, to comprise all modification, equivalent structure and function.
The application requires the preceence of the Japanese patent application No.2007-327405 that submitted on December 19th, 2007 and the Japanese patent application No.2008-166088 that submitted on June 25th, 2008, and the full content of above-mentioned patent application is contained in this by reference.
Claims (26)
1. sheet material conveyor, it comprises:
Reference plane, it extends and is configured to adjust the position of the side of the sheet material that will be transferred along the sheet material throughput direction;
Crooked conveying mechanism, it is configured to carry obliquely described sheet material, so that the described side of described sheet material touches described reference plane; And
The sheet material deformation unit, it is configured to when being made the described side of described sheet material be deformed into the waveform shape that extends along described sheet material throughput direction when described reference plane is carried described sheet material by described crooked conveying mechanism,
Described sheet material conveyor also comprises:
Guidance unit, it is configured to guide the described side of the described sheet material that will be adjusted by described reference plane and will be carried by described crooked conveying mechanism, described guidance unit comprises the first guide portion and the second guide portion, described the first guide portion has the sheet material conveyor surface in the face of a face of the described sheet material that will be transferred, described the second guide portion has the sheet material conveyor surface in the face of the another side of the described sheet material that will be transferred
Wherein, described sheet material deformation unit comprises:
The recess or the protuberance that are arranged on the described sheet material conveyor surface of described the first guide portion and arrange along described sheet material throughput direction; And
The protuberance or the recess that are arranged on the described sheet material conveyor surface of described the second guide portion and arrange along described sheet material throughput direction,
Wherein, the described protuberance of described the second guide portion or recess are relative with described recess or the protuberance of described the first guide portion.
2. sheet material conveyor according to claim 1, it is characterized in that, described sheet material deformation unit comprises and is configured to outstanding from the described sheet material conveyor surface of described the first guide portion or described the second guide portion and is biased at least one protrusion into outstanding state.
3. sheet material conveyor according to claim 2 is characterized in that, described protrusion comprises and is configured to the bulbous member that kept rotationally by described the first guide portion or described the second guide portion.
4. sheet material conveyor according to claim 2 is characterized in that, described protrusion comprises and is configured to the column roller that kept rotationally by described the first guide portion or described the second guide portion.
5. sheet material conveyor according to claim 2, it is characterized in that, described sheet material deformation unit comprises a pair of rotating guide reel, described guide reel is disposed on the sheet material conveyor surface relative with the described sheet material conveyor surface of having arranged described protrusion, wherein, described guide reel is disposed in upstream side and the downstream along described sheet material throughput direction of described protrusion, and outstanding from described sheet material conveyor surface.
6. sheet material conveyor, it comprises:
Reference plane, it extends and is configured to adjust the position of the side of the sheet material that will be transferred along the sheet material throughput direction;
Crooked conveying mechanism, it is configured to carry obliquely described sheet material, so that the described side of described sheet material touches described reference plane; And
The sheet material deformation unit, it is configured to when being made the described side of described sheet material be deformed into the waveform shape that extends along described sheet material throughput direction when described reference plane is carried described sheet material by described crooked conveying mechanism,
Described crooked conveying mechanism comprises a plurality of crooked conveying mechanism of arranging along described sheet material throughput direction, described sheet material deformation unit is configured to control described a plurality of crooked conveying mechanism beginning in turn along described sheet material throughput direction from described upstream side to rotate with feeding sheets, thus the side distortion of the described sheet material of time official post between the timing the when timing when described sheet material being set arriving each crooked conveying mechanism and described crooked conveying mechanism begin to rotate.
7. sheet material conveyor according to claim 6 is characterized in that, described sheet material conveyor also comprises in each that is arranged on described a plurality of crooked conveying mechanisms and be configured to detect the detecting sensor that is transferred sheet material,
Wherein, described sheet material deformation unit is configured to detection based on described detecting sensor and makes in described a plurality of crooked conveying mechanism each begin to rotate.
8. sheet material conveyor, it comprises:
Reference plane, it extends and is configured to adjust the position of the side of the sheet material that will be transferred along the sheet material throughput direction;
Crooked conveying mechanism, it is configured to carry obliquely described sheet material, so that the described side of described sheet material touches described reference plane; And
The sheet material deformation unit, it is configured to when being made the described side of described sheet material be deformed into the waveform shape that extends along described sheet material throughput direction when described reference plane is carried described sheet material by described crooked conveying mechanism,
Described crooked conveying mechanism comprises a plurality of crooked conveying mechanism of arranging along described sheet material throughput direction, and
Wherein, the speed component along described sheet material throughput direction that is arranged in the described crooked conveying mechanism in described downstream is configured to less than the speed component along described sheet material throughput direction of the described crooked conveying mechanism that is arranged in described upstream side.
9. sheet material conveyor according to claim 8, it is characterized in that, the angle of skew that is arranged in the described crooked conveying mechanism in described downstream is configured to larger than the angle of skew of the described crooked conveying mechanism that is arranged in described upstream side, wherein, described sheet material is carried with this angle of skew obliquely with respect to described sheet material throughput direction.
10. sheet material conveyor, it comprises:
Reference plane, it extends and is configured to adjust the position of the side of the sheet material that will be transferred along the sheet material throughput direction;
Crooked conveying mechanism, it is configured to carry obliquely described sheet material, so that the described side of described sheet material touches described reference plane; And
The sheet material deformation unit, it is configured to when being made the described side of described sheet material be deformed into the waveform shape that extends along described sheet material throughput direction when described reference plane is carried described sheet material by described crooked conveying mechanism,
Described sheet material deformation unit comprises:
A pair of guiding elements, it is configured to described reference plane guiding by the described side of the described sheet material of described crooked conveying mechanism conveying;
The flexible plate-like guiding elements, it is arranged on this to arranging on the guiding elements and along described sheet material throughput direction; And
Bending unit, it is constructed such that described tabular guiding elements is deformed into the waveform shape that extends along described sheet material throughput direction.
11. sheet material conveyor according to claim 10, it is characterized in that, described bending unit comprises and is arranged on this a plurality of protruding members to arranging on the guiding elements and along described sheet material throughput direction, and described protruding member is configured to from this guide surface to guiding elements outstanding.
12. sheet material conveyor according to claim 10, it is characterized in that, described guiding elements comprises a plurality of independently guide portion of arranging along described sheet material throughput direction, and actuator is set so that described guide portion connects or separates, wherein, described tabular guiding elements partly is fixed to each guide portion, and when described guide portion being connected or separate, described tabular guiding elements deforms.
13. sheet material conveyor according to claim 10, it is characterized in that, being positioned at described tabular guiding elements on the guiding elements, to be deformed into the position of convex relative along described sheet material throughput direction with the position that described tabular guiding elements on being positioned at another guiding elements is deformed into concavity, and being positioned at described tabular guiding elements on the guiding elements, to be deformed into the position of concavity relative along described sheet material throughput direction with the position that described tabular guiding elements on being positioned at another guiding elements is deformed into convex.
14. an image forming apparatus, it comprises:
Image formation unit, it is formed at and forms image on the sheet material; And
Sheet material conveyor, it is configured to carry described sheet material to described image formation unit,
Wherein, described sheet material conveyor comprises:
Reference plane, it extends and is configured to adjust the position of the side of the sheet material that will be transferred along the sheet material throughput direction;
Crooked conveying mechanism, it is configured to obliquely feeding sheets, so that the described side of described sheet material touches described reference plane; And
The sheet material deformation unit, it is configured to when being made the described side of described sheet material be deformed into the waveform shape that extends along described sheet material throughput direction when described reference plane is carried described sheet material by described crooked conveying mechanism,
Described image forming apparatus also comprises:
Guidance unit, it is configured to guide the described side of the described sheet material that will be adjusted by described reference plane and will be carried by described crooked conveying mechanism, described guidance unit comprises the first guide portion and the second guide portion, described the first guide portion has the sheet material conveyor surface in the face of a face of the described sheet material that will be transferred, described the second guide portion has the sheet material conveyor surface in the face of the another side of the described sheet material that will be transferred
Wherein, described sheet material deformation unit comprises:
The recess or the protuberance that are arranged on the described sheet material conveyor surface of described the first guide portion and arrange along described sheet material throughput direction; And
The protuberance or the recess that are arranged on the described sheet material conveyor surface of described the second guide portion and arrange along described sheet material throughput direction,
Wherein, the described protuberance of described the second guide portion or recess are relative with described recess or the protuberance of described the first guide portion.
15. image forming apparatus according to claim 14, it is characterized in that, described sheet material deformation unit comprises and is configured to outstanding from the described sheet material conveyor surface of described the first guide portion or described the second guide portion and is biased at least one protrusion into outstanding state.
16. image forming apparatus according to claim 15 is characterized in that, described protrusion comprises and is configured to the bulbous member that kept rotationally by described the first guide portion or described the second guide portion.
17. image forming apparatus according to claim 15 is characterized in that, described protrusion comprises and is configured to the column roller that kept rotationally by described the first guide portion or described the second guide portion.
18. image forming apparatus according to claim 15, it is characterized in that, described sheet material deformation unit comprises a pair of rotating guide reel, described guide reel is disposed on the sheet material conveyor surface relative with the described sheet material conveyor surface of having arranged described protrusion, wherein, described guide reel is disposed in upstream side and the downstream along described sheet material throughput direction of described protrusion, and outstanding from described sheet material conveyor surface.
19. an image forming apparatus, it comprises:
Image formation unit, it is formed at and forms image on the sheet material; And
Sheet material conveyor, it is configured to carry described sheet material to described image formation unit,
Wherein, described sheet material conveyor comprises:
Reference plane, it extends and is configured to adjust the position of the side of the sheet material that will be transferred along the sheet material throughput direction;
Crooked conveying mechanism, it is configured to obliquely feeding sheets, so that the described side of described sheet material touches described reference plane; And
The sheet material deformation unit, it is configured to when being made the described side of described sheet material be deformed into the waveform shape that extends along described sheet material throughput direction when described reference plane is carried described sheet material by described crooked conveying mechanism,
Described crooked conveying mechanism comprises a plurality of crooked conveying mechanism of arranging along described sheet material throughput direction, described sheet material deformation unit is configured to control described a plurality of crooked conveying mechanism beginning in turn along described sheet material throughput direction from described upstream side to rotate with feeding sheets, thus the side distortion of the described sheet material of time official post between the timing the when timing when described sheet material being set arriving each crooked conveying mechanism and described crooked conveying mechanism begin to rotate.
20. image forming apparatus according to claim 19 is characterized in that, described image forming apparatus also comprises in each that is arranged on described a plurality of crooked conveying mechanisms and is configured to detect the detecting sensor that is transferred sheet material,
Wherein, described sheet material deformation unit is configured to detection based on described detecting sensor and makes in described a plurality of crooked conveying mechanism each begin to rotate.
21. an image forming apparatus, it comprises:
Image formation unit, it is formed at and forms image on the sheet material; And
Sheet material conveyor, it is configured to carry described sheet material to described image formation unit,
Wherein, described sheet material conveyor comprises:
Reference plane, it extends and is configured to adjust the position of the side of the sheet material that will be transferred along the sheet material throughput direction;
Crooked conveying mechanism, it is configured to obliquely feeding sheets, so that the described side of described sheet material touches described reference plane; And
The sheet material deformation unit, it is configured to when being made the described side of described sheet material be deformed into the waveform shape that extends along described sheet material throughput direction when described reference plane is carried described sheet material by described crooked conveying mechanism,
Described crooked conveying mechanism comprises a plurality of crooked conveying mechanism of arranging along described sheet material throughput direction, and
Wherein, the speed component along described sheet material throughput direction that is arranged in the described crooked conveying mechanism in described downstream is configured to less than the speed component along described sheet material throughput direction of the described crooked conveying mechanism that is arranged in described upstream side.
22. image forming apparatus according to claim 21, it is characterized in that, the angle of skew that is arranged in the described crooked conveying mechanism in described downstream is configured to larger than the angle of skew of the described crooked conveying mechanism that is arranged in described upstream side, wherein, described sheet material is carried obliquely with respect to described sheet material throughput direction.
23. an image forming apparatus, it comprises:
Image formation unit, it is formed at and forms image on the sheet material; And
Sheet material conveyor, it is configured to carry described sheet material to described image formation unit,
Wherein, described sheet material conveyor comprises:
Reference plane, it extends and is configured to adjust the position of the side of the sheet material that will be transferred along the sheet material throughput direction;
Crooked conveying mechanism, it is configured to obliquely feeding sheets, so that the described side of described sheet material touches described reference plane; And
The sheet material deformation unit, it is configured to when being made the described side of described sheet material be deformed into the waveform shape that extends along described sheet material throughput direction when described reference plane is carried described sheet material by described crooked conveying mechanism,
Described sheet material deformation unit comprises:
A pair of guiding elements, it is configured to described reference plane guiding by the side of the described sheet material of described crooked conveying mechanism conveying;
The flexible plate-like guiding elements, it is arranged on this to arranging on the guiding elements and along described sheet material throughput direction; And
Bending unit, it is constructed such that described tabular guiding elements is deformed into the waveform shape that extends along described sheet material throughput direction.
24. image forming apparatus according to claim 23, it is characterized in that, described bending unit comprises and is arranged on this a plurality of protruding members to arranging on the guiding elements and along described sheet material throughput direction, and described protruding member is configured to from this guide surface to guiding elements outstanding.
25. image forming apparatus according to claim 23, it is characterized in that, described guiding elements comprises a plurality of independently guide portion of arranging along described sheet material throughput direction, and actuator is set so that described guide portion connects or separates, wherein, described tabular guiding elements partly is fixed to each guide portion, and when described guide portion being connected or separate, described tabular guiding elements deforms.
26. image forming apparatus according to claim 23, it is characterized in that, being positioned at described tabular guiding elements on the guiding elements, to be deformed into the position of convex relative along described sheet material throughput direction with the position that described tabular guiding elements on being positioned at another guiding elements is deformed into concavity, and being positioned at described tabular guiding elements on the guiding elements, to be deformed into the position of concavity relative along described sheet material throughput direction with the position that described tabular guiding elements on being positioned at another guiding elements is deformed into convex.
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007327405A JP5219492B2 (en) | 2007-12-19 | 2007-12-19 | Sheet conveying apparatus and image forming apparatus |
| JP2007327405 | 2007-12-19 | ||
| JP2007-327405 | 2007-12-19 | ||
| JP2008166088 | 2008-06-25 | ||
| JP2008-166088 | 2008-06-25 | ||
| JP2008166088A JP5197181B2 (en) | 2008-06-25 | 2008-06-25 | Sheet conveying apparatus and image forming apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101462651A CN101462651A (en) | 2009-06-24 |
| CN101462651B true CN101462651B (en) | 2013-01-09 |
Family
ID=40803486
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200810185868 Expired - Fee Related CN101462651B (en) | 2007-12-19 | 2008-12-18 | Sheet conveyance apparatus and image forming apparatus including the same |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP5219492B2 (en) |
| CN (1) | CN101462651B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8684353B2 (en) | 2010-10-15 | 2014-04-01 | Canon Kabushiki Kaisha | Sheet conveying apparatus and image forming apparatus |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5499910B2 (en) * | 2010-05-31 | 2014-05-21 | ブラザー工業株式会社 | Conveying device and image recording apparatus provided with the conveying device |
| CN102442564B (en) * | 2010-09-30 | 2016-03-02 | 山东新北洋信息技术股份有限公司 | Flaky medium deviation correction mechanism and the media processing device with this mechanism |
| JP5631159B2 (en) * | 2010-11-09 | 2014-11-26 | キヤノン株式会社 | Sheet conveying apparatus and image forming apparatus |
| CN103552862A (en) * | 2013-11-19 | 2014-02-05 | 赵士立 | Paper feeder of die-cutting machine |
| US9791814B2 (en) | 2015-04-09 | 2017-10-17 | Canon Kabushiki Kaisha | Image forming apparatus |
| JP6929690B2 (en) * | 2017-04-24 | 2021-09-01 | キヤノン株式会社 | Sheet transfer device and image forming device |
| EP3718938A4 (en) * | 2017-11-30 | 2021-12-08 | Fujitsu Frontech Limited | Paper sheet processing apparatus |
| JP2021155136A (en) * | 2020-03-25 | 2021-10-07 | キヤノン株式会社 | Sheet conveying device |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5847735A (en) * | 1981-09-17 | 1983-03-19 | Canon Inc | Sheet feeder |
| JPH0367853A (en) * | 1989-07-31 | 1991-03-22 | Canon Inc | Sheet material conveyer |
| JPH08175704A (en) * | 1994-12-26 | 1996-07-09 | Hitachi Koki Co Ltd | Device for truing up side edge of sheet |
| JP3361979B2 (en) * | 1996-12-09 | 2003-01-07 | ローレルバンクマシン株式会社 | Banknote aligner of banknote processing machine |
| JP3882533B2 (en) * | 2001-05-31 | 2007-02-21 | 富士ゼロックス株式会社 | Paper conveying apparatus and image forming apparatus |
-
2007
- 2007-12-19 JP JP2007327405A patent/JP5219492B2/en not_active Expired - Fee Related
-
2008
- 2008-12-18 CN CN 200810185868 patent/CN101462651B/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8684353B2 (en) | 2010-10-15 | 2014-04-01 | Canon Kabushiki Kaisha | Sheet conveying apparatus and image forming apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JP5219492B2 (en) | 2013-06-26 |
| JP2009149392A (en) | 2009-07-09 |
| CN101462651A (en) | 2009-06-24 |
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