US20080127493A1 - Manufacturing method of transfer unit - Google Patents
Manufacturing method of transfer unit Download PDFInfo
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- US20080127493A1 US20080127493A1 US11/873,920 US87392007A US2008127493A1 US 20080127493 A1 US20080127493 A1 US 20080127493A1 US 87392007 A US87392007 A US 87392007A US 2008127493 A1 US2008127493 A1 US 2008127493A1
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/14—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base
- G03G15/16—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer
- G03G15/1605—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer using at least one intermediate support
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49401—Fluid pattern dispersing device making, e.g., ink jet
Definitions
- the present invention relates to a manufacturing method of a transfer unit used in an image forming apparatus such as an electro-photographic copying machine, a facsimile machine and a printer.
- tandem method There are known various color image forming methods for the image forming apparatus.
- a method called tandem method is one of them.
- An image forming apparatus employing this tandem method is provided with, a photoconductive substance, light scanning device to write image data on the photoconductive substance, a plurality of image forming sections having a developing device to develop an electrostatic latent image formed on the photoconductive substance and a transfer units to transfer a toner image formed by each image forming section on the photoconductive substance onto a sheet.
- the image forming apparatus provided with the transfer unit there is known an apparatus in which the toner image formed on the photoconductive substance is transferred onto an intermediate transfer substance (hereinafter call a transfer belt as well) in a shape of an endless belt of the transfer unit, then the toner image on the intermediate transfer substance is transferred onto the sheet.
- the image forming apparatus employing the intermediate transfer substance is able to superimpose the toner images formed on the photoconductive substance on the intermediate substance, it is popularly used in color image forming apparatus, which forms a color image on the sheet.
- the color images of three colors i.e. yellow (Y), magenta (M) and cyan (C), or four colors where black (Bk) is added are transferred and superimposed on the intermediated transfer substance, thereafter this superimposed toner image is transferred onto the sheet in a lump using an electrostatic force.
- the toner images for respective colors formed on the photoconductive substance are transferred onto the intermediated transfer substance with predetermined timings so that color shifts do not occur when each color image is superimposed.
- FIG. 1 shows an example of the image forming apparatus
- FIG. 2 is a partial view of a transfer unit 60 in FIG. 1
- FIG. 3 is a view showing a frame format of rollers 61 and 62 as seem from an arrow X 1 in FIG. 2 , which indicates a state where the rollers 61 and 62 spanned by the intermediate transfer substance 6 are distorted as mentioned above.
- FIG. 3 shows that the rollers 61 and 62 in FIG. 3 are both straight rollers having the same diameter throughout entire width.
- FIG. 2 shows, if the rollers 51 and 62 distort in the axis direction, there is occurred a difference of a circumferential length between both ends sections and a middle section.
- FIG. 4( a ) is a diagram showing states of sub-scanning curves by respective colors, using line images as examples of the images of respective colors to be transferred, onto the sheet P, in case the photoconductive substances 1 Y, 1 M, 1 C and 1 K, and the intermediate transfer substance 8 are arranged as FIG. 1 shows.
- the sheet P is conveyed in an arrow W direction.
- the toner image, transferred onto the intermediated transfer substance 6 via the photoconductive substance 1 Y is transferred onto the sheep P as a yellow toner image YL in FIG. 4( a ).
- a cyan toner image CL, a magenta toner image ML and a black toner image Bk are transferred.
- the toner image transferred onto the intermediate transfer substance has more tendency to be effected in a portion near the rollers 61 and 62 and the sub-scanning curve is tend to occur.
- FIG. 4( b ) shows a state where the ends images are superimposed.
- a toner image CL for cyan color and toner image ML for magenta color are omitted.
- the figure show, even if the end sections are matched in this manner, there is occurred color shift at the middle section.
- Patent Document 1 Tokkai 2004-286981
- the image forming apparatus using the intermediated transfer substance is popularly used as the color image forming apparatus which forms the color image of the sheet, since the toner images formed on the photoconductive substance can be superimposed on the intermediate transfer substance.
- the method in the Patent Document 1 is to correct the sub-scanning curve of the image by correcting a writing beam to write the image data by controlling the pasture of the imaging element equipped in a light scanning device in the sub-scanning direction based on detected color shift.
- An object of the present invention is to provide a transfer unit, which can inhibit the sub-scanning curve with a simple structure, capable of forming the high quality image without having color shift.
- FIG. 1 is an image forming apparatus where a manufacturing method of a transfer unit, of the present invention is adaptable.
- FIG. 2 is a partial view of a transfer unit shown in FIG. 1 .
- FIG. 3 is a frame format of the transfer unit shown in FIG. 2 as seen from an arrow X 1 in FIG. 2 .
- FIG. 4( a ) a diagram showing states of sub-scanning curves by respective colors, using line images as examples of images of respective colors to be transferred onto a sheet P, in case photoconductive substances 1 Y, 1 M, 1 C and 1 K, and a intermediate transfer substance 8 are arranged as FIG. 1 shows.
- FIG. 4( h ) is a diagram where states of sub-scanning curve transferred onto a sheet are indicated by respective colors, where a cyan toner image and a magenta toner image are omitted.
- FIG. 5 is a diagram where states of sub-scanning curve transferred and superimposed onto a sheet are indicated.
- FIG. 6 is a view where an endless belt is used for a photoconductive substance in a shape of a belt.
- FIG. 7 is a view where an endless belt of a transfer unit is used as a sheet conveyance belt.
- FIG. 1 is a view showing an example of an image forming apparatus to which the manufacturing method of transfer unit related to the present invention can be adapted.
- the image forming apparatus related to the present invention is configured with an image forming apparatus main body GH and an image reading apparatus YS.
- the image forming apparatus main body GH, so called tandem type color image forming apparatus includes a transfer unit 60 having a plurality of sets of image forming sections 10 Y, 10 M, 10 C and 10 K, and an intermediated transfer substance 6 in a shape of an endless belt; a sheet feeding section said a fixing device 9 .
- the image reading apparatus YS configured with an automatic document feeding device 201 and a scanning exposing device 202 is disposed.
- a document d placed on a document table of the automatic document feeding device 201 is conveyed through conveyance rollers and the image on a single side or both sides of the document d is light scanned through an optical system of scanning exposing device 201 and read by a line image sensor CCD.
- Signals formed by photoelectric conversion through the line image sensors CCD are processed by analogue processing, shading correction, A/D conversion and image compression thereafter sent to exposing sections 3 Y, 3 M, 3 C and 3 K.
- the image forming section 10 Y to form a yellow color image is provided with a charging section 2 Y, an exposing section 3 Y, a developing device 4 Y and a cleaning section 8 Y at a peripheral of the photoconductive substance in a shape of a drum.
- the image forming section 10 M to form a magenta color image is provided with a charging section 2 M, an exposing section 3 M, a developing device 4 M and a cleaning section 8 M at a peripheral of the photoconductive substance in a shape of a drum.
- the image forming section 10 C to form a cyan color image is provided with a charging section 2 C, an exposing section 3 C, a developing device 4 C and a cleaning section 8 C at a peripheral of the photoconductive substance in a shape of a drum.
- the image forming section 10 K to form a black color image is provided with a charging section 2 K, an exposing section 3 K, a developing device 4 K and a cleaning section 8 K at a peripheral of the photoconductive substance in a shape of a drum.
- each of the developing devices 4 Y, 4 M, 4 C and 4 K contains each of yellow (Y), magenta (M), cyan (C) and black (K) binary developing agent including toner and carrier of small particle diameters.
- the intermediated transfer* substance 6 trains about a plurality of the rollers, being supported rotatably.
- the fixing device 9 includes a first pressure roller 93 having an elastic layer over a core steel; a heating roller 92 having a heater inside; a endless fixing belt training about the first pressure roller 93 and the heating roller 92 , a second pressure roller 94 arranged in a position opposite to the first pressure roller 93 in a way that a second pressure roller 94 is in contact with the fixing belt 91 with pressure so as to form a fixing nip section; and fixes toner not yet fixed onto the sheet P with a heat and a pressure when the sheet F passes through the fixing nip section in a direction where the a toner surface of the sheet P before fixing comes in contact with the fixing belt 91 .
- the toner images of respective colors formed through the image forming sections 10 Y, 10 M, 10 C and 10 K are subsequently superimposed on the intermediate transfer substance 6 in rotation motion so as to be primary transferred, thus a color toner image where the toner images of respective colors are superimposed is formed.
- the sheet P stored in a cassette 20 is fed by a sheet feeding section 21 and goes through the sheet feeding rollers 22 A, 22 B, 22 C, 22 D and resist roller 23 then is conveyed to a transfer section 7 A so as to the color toner image is secondary transferred onto the sheet P.
- the sheet P on which the color image has been transferred is heated and pressed at a fixing device 9 so that the color image is fixed onto the sheet P. Thereafter, sheet P is grasped by a discharging rollers 24 and loaded on a discharge sheet tray 25 outside the apparatus.
- the intermediate transfer substance 6 from which the sheet P is separated by curvature is cleaned by the cleaning section 8 A to remove remaining toner.
- FIG. 5 is a frame format of the intermediate transfer substance 6 and rollers 61 and 62 of the transfer unit 60 as seen from an arrow X 1 in FIG. 2 .
- the roller 61 is a straight roller and the roller 62 is so-called crown roller where a diameter Dc at middle section is larger than a diameter Ds of the end sections.
- a crown of the roller 62 is formed in a shape of a straight line or in a shape of a circular arc.
- a roller 62 is machined in order to realize high accuracy of dimension. However, it is preferable to cast the roller 62 from a view point of the cost, in case a highly accurate steel molding can be used thanks to a large number of the rollers 62 are produced.
- An increasing amount of the diameter of the meddle section of the roller 62 in respect to the end sections (Dc-Ds) is determined in accordance with a degree of sub-scanning curvature of the image transferred onto the sheet P.
- FIG. 4 shows, to measure the degree of the sub-scanning curvature, a largest distance of each image in the middle part of the image is measured.
- the above measurement is carried out by actually measuring the aforesaid largest distance with measuring instruments such as a scale and a magnifier.
- measuring instruments such as a scale and a magnifier.
- a distance h between the yellow color image and the black color image both having a large sub-scanning curvature is measured.
- the measured distance h is assigned as a standard value for the increasing amount of the diameter at the middle section of the roller 62 .
- printing test is further carried out with trimming so as to determine an optimum value.
- the distance h of the sub-scanning curve is 100 ⁇ m, thus 100 ⁇ m is assigned to the increasing amount at the roller middle section to inhibit the color shift.
- distance measuring devices such as an image sensor can be used.
- the image sensor With the image sensor, a measuring error can be eliminated and an accurate measurement can be easily realized.
- the distortion amount of the rollers 61 and 62 when the intermediate transfer substance 6 is spanned is calculated by means of rigidity calculation. Then a degree of sub-scanning curvature is estimated based on the distortion amount so as to determine a standard value of the increasing amount of the diameter of the middle section of the roller 62 . Thus printing test is further carried out with trimming so as to determine the optimum value.
- Presumption of the degree of sub-scanning curvature can be carried out by measuring amounts of deformation of the rollers 61 and 62 or the intermediate transfer substance 6 while the rollers are spanned by the intermediate transfer substance 6 . Also it can be carried out by measuring a circumferential speed of the intermediate transfer substance 6 . As above by presumption of the degree of sub-scanning curvature based on measurement of the actual apparatus, more realistic presumption can be possible.
- the transfer unit 60 capable of forming the high quality image, without having the color shift, using simple parts and the structure with low cost.
- a photoconductive substances ( 1 Y, 1 M, 1 C and 1 K) have a drum shape, however, they can be in a shape of an endless belt.
- FIG. 6 shows an example. Since the structure of each color is the same, here yellow color will be described.
- Rollers 1 Y 2 and 1 Y 3 are spanned with a photoconductive substance 1 Y 1 in the shape of a belt.
- At a peripheral of the photoconductive substance. 1 Y 1 training about the roller 1 Y 3 an unillustrated charging section 2 Y, exposing section 3 Y, developing section 4 Y and cleaning section 8 Y are arranged. The configuration conforms to the photoconductive drum shown by FIG. 1 .
- FIG. 1 The configuration conforms to the photoconductive drum shown by FIG. 1 .
- FIG. 6 shows an example where two rollers are spanned by the photoconductive substance 1 Y 1 , and number of the rollers can be more than two.
- the above structure expands a possibility of arranging the charging section 2 Y, the exposing section 3 Y, the developing section 4 Y and the cleaning section 8 Y.
- FIG. 7 shows an example of other embodiment of the transfer unit.
- a transfer section is configured with transfer rollers ( 7 Y, 7 M, 7 C and 7 B) which are arranged opposite to the photoconductive substances via a conveyance belt 6 b.
- a sheet P is conveyed on the conveyance belt and goes through from a right direction of FIG. 7 so as to transfer an image formed on a photoconductive drum onto the sheet P.
- a transfer unit which can inhibit the sub-scanning curve with a simple structure capable of forming the high quality image without having the color shift.
Abstract
A diameter of middle section of at leas one of rollers, which are spanned by an intermediated transfer substance, is increased in respect to the diameter of end sections thereof by an amount which is determined in accordance with a degree of sub-scanning curvature of an image transferred onto a sheet.
Description
- This application, is based on Japanese Patent Application No. 2006-326903 filed on Dec. 4, 2006, in Japanese Patent Office, the entire content of which is hereby incorporated by reference.
- The present invention relates to a manufacturing method of a transfer unit used in an image forming apparatus such as an electro-photographic copying machine, a facsimile machine and a printer.
- There are known various color image forming methods for the image forming apparatus. A method called tandem method is one of them. An image forming apparatus employing this tandem method is provided with, a photoconductive substance, light scanning device to write image data on the photoconductive substance, a plurality of image forming sections having a developing device to develop an electrostatic latent image formed on the photoconductive substance and a transfer units to transfer a toner image formed by each image forming section on the photoconductive substance onto a sheet.
- As the image forming apparatus provided with the transfer unit, there is known an apparatus in which the toner image formed on the photoconductive substance is transferred onto an intermediate transfer substance (hereinafter call a transfer belt as well) in a shape of an endless belt of the transfer unit, then the toner image on the intermediate transfer substance is transferred onto the sheet. Since the image forming apparatus employing the intermediate transfer substance is able to superimpose the toner images formed on the photoconductive substance on the intermediate substance, it is popularly used in color image forming apparatus, which forms a color image on the sheet. In the color image forming apparatus, the color images of three colors i.e. yellow (Y), magenta (M) and cyan (C), or four colors where black (Bk) is added, are transferred and superimposed on the intermediated transfer substance, thereafter this superimposed toner image is transferred onto the sheet in a lump using an electrostatic force.
- The toner images for respective colors formed on the photoconductive substance are transferred onto the intermediated transfer substance with predetermined timings so that color shifts do not occur when each color image is superimposed.
- However, a plurality of rollers are spanned with the intermediate transfer substance with a certain tension, a distorted occurs in the rollers in a direction of a roller axis.
-
FIG. 1 shows an example of the image forming apparatus,FIG. 2 is a partial view of atransfer unit 60 inFIG. 1 .FIG. 3 is a view showing a frame format ofrollers FIG. 2 , which indicates a state where therollers intermediate transfer substance 6 are distorted as mentioned above. Meanwhile,FIG. 3 shows that therollers FIG. 3 are both straight rollers having the same diameter throughout entire width. - As
FIG. 2 shows, if therollers 51 and 62 distort in the axis direction, there is occurred a difference of a circumferential length between both ends sections and a middle section. Thus moving distances of the toner image transferred from the photoconductive substance to theintermediated transfer substance 6, until the toner image is transferred onto the sheet P differ between the both end sections and the middle section of theintermediated transfer substance 6, therefore a sub-scanning curve occurs in a sub-scanning direction (sheet conveyance direction) when the toner image transferred onto theintermediate transfer substance 6 is transferred onto the sheet P. -
FIG. 4( a) is a diagram showing states of sub-scanning curves by respective colors, using line images as examples of the images of respective colors to be transferred, onto the sheet P, in case thephotoconductive substances FIG. 1 shows. Here the sheet P is conveyed in an arrow W direction. The toner image, transferred onto theintermediated transfer substance 6 via thephotoconductive substance 1Y is transferred onto the sheep P as a yellow toner image YL inFIG. 4( a). In the same manner, a cyan toner image CL, a magenta toner image ML and a black toner image Bk are transferred. As above understanding, the toner image transferred onto the intermediate transfer substance has more tendency to be effected in a portion near therollers - As above, there was a problem that a high quality image can not be obtained due to color shift if the images of respective colors are transferred onto the sheet P in a state where the sub-scanning curve occurs for each color.
FIG. 4( b) shows a state where the ends images are superimposed. Here a toner image CL for cyan color and toner image ML for magenta color are omitted. As the figure show, even if the end sections are matched in this manner, there is occurred color shift at the middle section. - Contrarily, there is disclosed a method that the curving of a scan line, a position of the scan line or inclination of the scan line are corrected by controlling a posture of an imaging element based on information from a color shift sensor arranged near the intermediated transfer substance through an actuator (for example Patent Document 1).
- Patent Document 1: Tokkai 2004-286981
- As above, the image forming apparatus using the intermediated transfer substance is popularly used as the color image forming apparatus which forms the color image of the sheet, since the toner images formed on the photoconductive substance can be superimposed on the intermediate transfer substance. However, since the sub-scanning curve occurs in the image, there was a problem that a high quality image can not be obtained due to the color shift at the time of color imposing. The method in the Patent Document 1 is to correct the sub-scanning curve of the image by correcting a writing beam to write the image data by controlling the pasture of the imaging element equipped in a light scanning device in the sub-scanning direction based on detected color shift.
- Therefore, a device to control posture of the imaging element, device to correct the sub-scanning curve and the sensor to detect the sub-scanning curve were necessary, therefore the apparatus became complicated which increases the cost.
- An object of the present invention is to provide a transfer unit, which can inhibit the sub-scanning curve with a simple structure, capable of forming the high quality image without having color shift.
- The above object can be achieved by the following. A manufacturing method of a transfer unit to transfer a plurality of toner images onto a sheet, having a endless belt and a plurality of rollers which are spanned by the endless belt, the method having determining an increasing amount of a diameter of a middle section of at least one of a plurality of the rollers in respect to end sections thereof, in accordance with a degree of sub-scanning curvature of an image transferred onto the sheet.
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FIG. 1 is an image forming apparatus where a manufacturing method of a transfer unit, of the present invention is adaptable. -
FIG. 2 is a partial view of a transfer unit shown inFIG. 1 . -
FIG. 3 is a frame format of the transfer unit shown inFIG. 2 as seen from an arrow X1 inFIG. 2 . -
FIG. 4( a) a diagram showing states of sub-scanning curves by respective colors, using line images as examples of images of respective colors to be transferred onto a sheet P, in casephotoconductive substances FIG. 1 shows. -
FIG. 4( h) is a diagram where states of sub-scanning curve transferred onto a sheet are indicated by respective colors, where a cyan toner image and a magenta toner image are omitted. -
FIG. 5 is a diagram where states of sub-scanning curve transferred and superimposed onto a sheet are indicated. -
FIG. 6 is a view where an endless belt is used for a photoconductive substance in a shape of a belt. -
FIG. 7 is a view where an endless belt of a transfer unit is used as a sheet conveyance belt. - The following describes an embodiment of a manufacturing method of a transfer unit related to the present invention with reference to drawings, without the present invention being restricted thereto:
-
FIG. 1 is a view showing an example of an image forming apparatus to which the manufacturing method of transfer unit related to the present invention can be adapted. - The image forming apparatus related to the present invention is configured with an image forming apparatus main body GH and an image reading apparatus YS. The image forming apparatus main body GH, so called tandem type color image forming apparatus includes a
transfer unit 60 having a plurality of sets ofimage forming sections intermediated transfer substance 6 in a shape of an endless belt; a sheet feeding section said a fixing device 9. - Above the image forming apparatus main body GH, the image reading apparatus YS configured with an automatic
document feeding device 201 and a scanning exposingdevice 202 is disposed. A document d placed on a document table of the automaticdocument feeding device 201 is conveyed through conveyance rollers and the image on a single side or both sides of the document d is light scanned through an optical system of scanning exposingdevice 201 and read by a line image sensor CCD. - Signals formed by photoelectric conversion through the line image sensors CCD are processed by analogue processing, shading correction, A/D conversion and image compression thereafter sent to exposing
sections - The
image forming section 10Y to form a yellow color image is provided with acharging section 2Y, anexposing section 3Y, a developingdevice 4Y and acleaning section 8Y at a peripheral of the photoconductive substance in a shape of a drum. Theimage forming section 10M to form a magenta color image is provided with acharging section 2M, anexposing section 3M, a developingdevice 4M and a cleaning section 8M at a peripheral of the photoconductive substance in a shape of a drum. The image forming section 10C to form a cyan color image is provided with a charging section 2C, anexposing section 3C, a developingdevice 4C and acleaning section 8C at a peripheral of the photoconductive substance in a shape of a drum. Theimage forming section 10K to form a black color image is provided with acharging section 2K, anexposing section 3K, a developingdevice 4K and acleaning section 8K at a peripheral of the photoconductive substance in a shape of a drum. - Meanwhile, each of the developing
devices - The intermediated transfer*
substance 6 trains about a plurality of the rollers, being supported rotatably. - The fixing device 9 includes a
first pressure roller 93 having an elastic layer over a core steel; aheating roller 92 having a heater inside; a endless fixing belt training about thefirst pressure roller 93 and theheating roller 92, asecond pressure roller 94 arranged in a position opposite to thefirst pressure roller 93 in a way that asecond pressure roller 94 is in contact with thefixing belt 91 with pressure so as to form a fixing nip section; and fixes toner not yet fixed onto the sheet P with a heat and a pressure when the sheet F passes through the fixing nip section in a direction where the a toner surface of the sheet P before fixing comes in contact with thefixing belt 91. - Thereby, the toner images of respective colors formed through the
image forming sections intermediate transfer substance 6 in rotation motion so as to be primary transferred, thus a color toner image where the toner images of respective colors are superimposed is formed. The sheet P stored in acassette 20 is fed by asheet feeding section 21 and goes through thesheet feeding rollers resist roller 23 then is conveyed to atransfer section 7A so as to the color toner image is secondary transferred onto the sheet P. The sheet P on which the color image has been transferred is heated and pressed at a fixing device 9 so that the color image is fixed onto the sheet P. Thereafter, sheet P is grasped by adischarging rollers 24 and loaded on adischarge sheet tray 25 outside the apparatus. - On the other hand, after the color toner image is transferred onto the sheet P through the
transfer section 7A, theintermediate transfer substance 6 from which the sheet P is separated by curvature is cleaned by thecleaning section 8A to remove remaining toner. - The following will describe a manufacturing method related to the present invention employing the transfer unit.
-
FIG. 5 is a frame format of theintermediate transfer substance 6 androllers transfer unit 60 as seen from an arrow X1 inFIG. 2 . Theroller 61 is a straight roller and theroller 62 is so-called crown roller where a diameter Dc at middle section is larger than a diameter Ds of the end sections. A crown of theroller 62 is formed in a shape of a straight line or in a shape of a circular arc. In the embodiment of the present invention, aroller 62 is machined in order to realize high accuracy of dimension. However, it is preferable to cast theroller 62 from a view point of the cost, in case a highly accurate steel molding can be used thanks to a large number of therollers 62 are produced. - An increasing amount of the diameter of the meddle section of the
roller 62 in respect to the end sections (Dc-Ds) is determined in accordance with a degree of sub-scanning curvature of the image transferred onto the sheet P. - As
FIG. 4 shows, to measure the degree of the sub-scanning curvature, a largest distance of each image in the middle part of the image is measured. The above measurement is carried out by actually measuring the aforesaid largest distance with measuring instruments such as a scale and a magnifier. In the present embodiment, a distance h between the yellow color image and the black color image both having a large sub-scanning curvature is measured. - The measured distance h is assigned as a standard value for the increasing amount of the diameter at the middle section of the
roller 62. Using theroller 62 having the standard value, printing test, is further carried out with trimming so as to determine an optimum value. - In the present embodiment, the distance h of the sub-scanning curve is 100 μm, thus 100 μm is assigned to the increasing amount at the roller middle section to inhibit the color shift.
- In the above measurement, distance measuring devices such as an image sensor can be used. With the image sensor, a measuring error can be eliminated and an accurate measurement can be easily realized.
- Also, in advance, the distortion amount of the
rollers intermediate transfer substance 6 is spanned is calculated by means of rigidity calculation. Then a degree of sub-scanning curvature is estimated based on the distortion amount so as to determine a standard value of the increasing amount of the diameter of the middle section of theroller 62. Thus printing test is further carried out with trimming so as to determine the optimum value. - Presumption of the degree of sub-scanning curvature can be carried out by measuring amounts of deformation of the
rollers intermediate transfer substance 6 while the rollers are spanned by theintermediate transfer substance 6. Also it can be carried out by measuring a circumferential speed of theintermediate transfer substance 6. As above by presumption of the degree of sub-scanning curvature based on measurement of the actual apparatus, more realistic presumption can be possible. - According to the above embodiment, it is possible to equalize the moving distances of the toner image, which is transferred from the photoconductive substance onto the
intermediate substance 6, until the toner image is transferred onto the sheet P at the both ends and at the middle section of theintermediate transfer substance 6, thus the color shift due to sub-scanning curve of the image can be inhibited. Thereby there can be provided atransfer unit 60 capable of forming the high quality image, without having the color shift, using simple parts and the structure with low cost. - In the present embodiment, a photoconductive substances (1Y, 1M, 1C and 1K) have a drum shape, however, they can be in a shape of an endless belt.
FIG. 6 shows an example. Since the structure of each color is the same, here yellow color will be described. Rollers 1Y2 and 1Y3 are spanned with a photoconductive substance 1Y1 in the shape of a belt. At a peripheral of the photoconductive substance. 1Y1 training about the roller 1Y3, anunillustrated charging section 2Y, exposingsection 3Y, developingsection 4Y andcleaning section 8Y are arranged. The configuration conforms to the photoconductive drum shown byFIG. 1 .FIG. 6 shows an example where two rollers are spanned by the photoconductive substance 1Y1, and number of the rollers can be more than two. The above structure expands a possibility of arranging thecharging section 2Y, the exposingsection 3Y, the developingsection 4Y and thecleaning section 8Y. - Also, in the present embodiment, the endless belt of the
transfer unit 60 was used as the intermediate transfer substance, however in other embodiment, the endless is not used as the intermediate transfer substance, the belt can be used as a sheet conveyance belt.FIG. 7 shows an example of other embodiment of the transfer unit. A transfer section is configured with transfer rollers (7Y, 7M, 7C and 7B) which are arranged opposite to the photoconductive substances via aconveyance belt 6 b. A sheet P is conveyed on the conveyance belt and goes through from a right direction ofFIG. 7 so as to transfer an image formed on a photoconductive drum onto the sheet P. In this case, since the sheet P is nipped and conveyed by the photoconductive substances (1Y, 1M, 1C and 1K) and the transfer rollers (7Y, 7M, 7 c and 7 k) via theconveyance belt 6 b, the color shift due to the distortion ofrollers FIG. 7 , and by increasing the diameter of the middle section of theroller 62 b in respect to the diameters of the end sections in the above method, the color shift due to the sub-scanning curve of image can be inhibited. - According to the above embodiments of the present invention, there can be manufactured a transfer unit, which can inhibit the sub-scanning curve with a simple structure capable of forming the high quality image without having the color shift.
Claims (12)
1. A manufacturing method of a transfer unit to transfer a plurality of toner images transferred from a photo conducive substance onto a sheet, having a endless belt and a plurality of rollers which are spanned by the endless belt, the method comprising:
determining an increasing amount of a diameter of a middle section of at least one of a plurality of the rollers in respect to end sections thereof, in accordance with a degree of sub-scanning curvature of an image transferred onto the sheet.
2. The manufacturing method of claim 1 , wherein the rollers are produced by machining.
3. The manufacturing method of claim 1 , wherein the rollers are produced by casting.
4. The manufacturing method of claim 1 , wherein the increasing amount of the diameter of the middle section of the roller is determined based on a measurement value of the degree of sub-scanning curvature of the image transferred onto the sheet.
5. The manufacturing method of claim 1 , wherein the increasing amount of the diameter of the middle section of the roller is determined based on a measurement value of the degree of sub-scanning curvature of the image transferred onto the sheet measured by an image sensor.
6. The manufacturing method of claim 1 , wherein the increasing amount of the diameter of the middle section of the roller is determined by presumption of the degree of sub-scanning curvature in case the image is transferred onto the sheet based on a rigidity calculation of the endless belt and the rollers.
7. The manufacturing method of claim 1 , wherein the increasing amount of the diameter of the middle section of the roller is determined by presumption of the degree of sub-scanning curvature in case the image is transferred onto the sheet based on measurement amounts of distortion of the endless belt and the rollers.
8. The manufacturing method of claim 1 , wherein the increasing amount of the diameter of the middle section of the roller is determined by presumption of the degree of sub-scanning curvature in case the image is transferred onto the sheet based on a measurement circumferential speed of the endless belt.
9. The manufacturing method of claim 1 , wherein the photoconductive substance is in a shape of a drum.
10. The manufacturing method of claim 1 , wherein the photoconductive substance is in a shape of a belt.
11. The manufacturing method of claim 1 , wherein the end less belt is an intermediate transfer substance on which the toner image developed, by developer is transferred.
12. The manufacturing method of claim 1 , wherein the end less belt is a conveyance belt to convey the sheet.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JPJP2006-326903 | 2006-12-04 | ||
JP2006326903A JP2008139648A (en) | 2006-12-04 | 2006-12-04 | Method for manufacturing transfer unit |
Publications (1)
Publication Number | Publication Date |
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US20080127493A1 true US20080127493A1 (en) | 2008-06-05 |
Family
ID=39474112
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US11/873,920 Abandoned US20080127493A1 (en) | 2006-12-04 | 2007-10-17 | Manufacturing method of transfer unit |
Country Status (2)
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US (1) | US20080127493A1 (en) |
JP (1) | JP2008139648A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20150117911A1 (en) * | 2013-10-25 | 2015-04-30 | Oki Data Corporation | Image forming apparatus |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5472771B1 (en) | 2012-09-28 | 2014-04-16 | コスメディ製薬株式会社 | Microneedle holding drug on the step |
CN104192676B (en) * | 2014-07-29 | 2016-11-09 | 河北东方富达机械有限公司 | Position-adjustable and the vertical swelling device of elevator with avoidance space |
KR102483597B1 (en) | 2016-12-28 | 2023-01-03 | 코스메드 파마소티컬 씨오 쩜 엘티디 | Microneedle array with applied drug |
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US4830468A (en) * | 1987-01-20 | 1989-05-16 | Xerox Corporation | Liquid crystal print bar having a single backplane electrode |
US6323939B1 (en) * | 1998-06-30 | 2001-11-27 | Canon Kabushiki Kaisha | Image forming apparatus with a re-feeding path for duplex copying having waiting position therein |
US7147596B2 (en) * | 2002-02-26 | 2006-12-12 | Reynolds Ronald W | Low-mass roller or pulley |
US7497162B2 (en) * | 2003-09-01 | 2009-03-03 | Koenig & Bauer Aktiengesellschaft | Method for reducing register errors on a web of material moving through the printing nip of a multicolor web-fed rotary press and corresponding devices |
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Publication number | Priority date | Publication date | Assignee | Title |
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JPH10268610A (en) * | 1997-03-28 | 1998-10-09 | Minolta Co Ltd | Image forming device |
JP3959919B2 (en) * | 2000-02-18 | 2007-08-15 | 富士ゼロックス株式会社 | Image forming apparatus |
JP2003345142A (en) * | 2002-05-27 | 2003-12-03 | Canon Inc | Image forming apparatus |
JP4280691B2 (en) * | 2003-08-29 | 2009-06-17 | キヤノン株式会社 | Roller member and manufacturing method thereof |
-
2006
- 2006-12-04 JP JP2006326903A patent/JP2008139648A/en active Pending
-
2007
- 2007-10-17 US US11/873,920 patent/US20080127493A1/en not_active Abandoned
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4830468A (en) * | 1987-01-20 | 1989-05-16 | Xerox Corporation | Liquid crystal print bar having a single backplane electrode |
US6323939B1 (en) * | 1998-06-30 | 2001-11-27 | Canon Kabushiki Kaisha | Image forming apparatus with a re-feeding path for duplex copying having waiting position therein |
US7147596B2 (en) * | 2002-02-26 | 2006-12-12 | Reynolds Ronald W | Low-mass roller or pulley |
US7497162B2 (en) * | 2003-09-01 | 2009-03-03 | Koenig & Bauer Aktiengesellschaft | Method for reducing register errors on a web of material moving through the printing nip of a multicolor web-fed rotary press and corresponding devices |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20150117911A1 (en) * | 2013-10-25 | 2015-04-30 | Oki Data Corporation | Image forming apparatus |
US9152072B2 (en) * | 2013-10-25 | 2015-10-06 | Oki Data Corporation | Image forming apparatus |
Also Published As
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JP2008139648A (en) | 2008-06-19 |
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Owner name: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC., JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:IWASAKI, TAKAHIRO;REEL/FRAME:020023/0563 Effective date: 20071002 |
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