WO2017179368A1 - 中間転写ユニット及び画像形成装置 - Google Patents
中間転写ユニット及び画像形成装置 Download PDFInfo
- Publication number
- WO2017179368A1 WO2017179368A1 PCT/JP2017/011113 JP2017011113W WO2017179368A1 WO 2017179368 A1 WO2017179368 A1 WO 2017179368A1 JP 2017011113 W JP2017011113 W JP 2017011113W WO 2017179368 A1 WO2017179368 A1 WO 2017179368A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- intermediate transfer
- transfer belt
- tension
- belt
- roller
- Prior art date
Links
Images
Classifications
-
- 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
- G03G15/1615—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 relating to the driving mechanism for the intermediate support, e.g. gears, couplings, belt tensioning
-
- 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
- G03G15/01—Apparatus for electrographic processes using a charge pattern for producing multicoloured copies
-
- 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
- G03G15/01—Apparatus for electrographic processes using a charge pattern for producing multicoloured copies
- G03G15/0105—Details of unit
- G03G15/0131—Details of unit for transferring a pattern to a second base
- G03G15/0136—Details of unit for transferring a pattern to a second base transfer member separable from recording member or vice versa, mode switching
-
- 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
- G03G15/01—Apparatus for electrographic processes using a charge pattern for producing multicoloured copies
- G03G15/0142—Structure of complete machines
- G03G15/0178—Structure of complete machines using more than one reusable electrographic recording member, e.g. one for every monocolour image
- G03G15/0189—Structure of complete machines using more than one reusable electrographic recording member, e.g. one for every monocolour image primary transfer to an intermediate transfer belt
-
- 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
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G21/00—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
- G03G21/16—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G21/00—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
- G03G21/16—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements
- G03G21/1661—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements means for handling parts of the apparatus in the apparatus
- G03G21/168—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements means for handling parts of the apparatus in the apparatus for the transfer unit
Definitions
- the present invention relates to an intermediate transfer unit and an image forming apparatus provided in the image forming apparatus.
- the image forming apparatus refers to, for example, an electrophotographic copying machine, an electrophotographic printer (for example, a laser beam printer, an LED printer, or the like).
- each color toner image is sequentially superimposed and transferred onto the surface of an intermediate transfer belt by a primary transfer roller (transfer member), and then a full-color toner image is collectively applied to a recording material.
- a primary transfer roller transfer member
- This intermediate transfer tandem system has an advantage that it can cope with high productivity and conveyance of various media.
- the intermediate transfer belt is driven to run while being stretched by a plurality of stretching rollers including a driving roller.
- an intermediate transfer tandem type image forming apparatus when a monochrome image is formed, a configuration in which a primary transfer roller provided in a color image forming unit is separated from an intermediate transfer belt is known.
- the tension of the intermediate transfer belt may change in accordance with the change in the tension layout of the intermediate transfer belt between monochrome image formation and color image formation.
- the primary transfer roller is arranged as described in Patent Document 1
- the force received by the black primary transfer roller from the intermediate transfer belt that is not separated from the intermediate transfer belt may change, and the following phenomenon may occur.
- the intermediate transfer belt is moved to the primary transfer roller.
- the pressing force becomes weaker.
- the primary transfer roller 55 is moved from the position indicated by the solid line as shown in FIG. It changes to the position of the broken line.
- the contact point P2 between the primary transfer roller 55 and the intermediate transfer belt 57 changes to the contact point P3.
- the distance between the contacts from the contact point P1 between the photosensitive drum 51 and the intermediate transfer belt 57 to the contact point between the primary transfer roller 55 and the intermediate transfer belt 57 changes from L1 to L2.
- the intermediate transfer belt 57 is a resistor, so that when the bias is applied to the primary transfer roller 55, the primary transfer current flowing from the primary transfer roller 55 to the photosensitive drum 51 changes, This may cause image defects.
- the present invention has been made in view of such a situation, and suppresses a change in current flowing from the transfer member to the photosensitive member in a configuration in which a part of the plurality of transfer members can be separated from the intermediate transfer belt. It is an object to provide an intermediate transfer unit that can be used.
- a typical configuration of the intermediate transfer unit according to the present invention for achieving the above object is an intermediate transfer unit supported by an image forming apparatus, which is formed on the surface of each of the first and second photosensitive members.
- the intermediate transfer belt is arranged corresponding to each of the endless intermediate transfer belt to which the developer image is transferred and the first and second photosensitive members, and is in contact with the inner peripheral surface of the intermediate transfer belt.
- the first and second transfer members that transfer the developer image to the intermediate transfer belt in a moving direction of the intermediate transfer belt in a region where the photosensitive member and the intermediate transfer belt are in contact with each other.
- the first position which is the downstream end, is upstream from the second position, which is the upstream end of the region where the transfer member corresponding to the photoconductor and the intermediate transfer belt are in contact with each other.
- First and second transfer respectively arranged in A moving mechanism that is movable between a material, a contact position where the first transfer member is brought into contact with the intermediate transfer belt, and a separation position where the first transfer member is separated from the intermediate transfer belt, and the second transfer member is A changing mechanism for changing an urging force for urging the intermediate transfer belt so that an urging force when the first transfer member is at the separation position is weaker than an urging force when the first transfer member is at the contact position. And a change mechanism for changing the urging force.
- changes in the primary transfer current can be suppressed in a configuration in which a part of the plurality of transfer members can be separated from the intermediate transfer belt.
- FIG. 1 is a schematic cross-sectional view of an image forming apparatus. It is explanatory drawing regarding arrangement
- FIG. 3 is a cross-sectional view of an intermediate transfer unit in a monochrome mode and a color mode. It is explanatory drawing for demonstrating the subject of a prior art.
- the image forming apparatus A is an electrophotographic system in which toner of four colors of yellow Y, magenta M, cyan C, and black K (black) is primarily transferred to an intermediate transfer belt and then secondarily transferred to an image forming medium to form an image.
- An intermediate transfer tandem type color image forming apparatus is an electrophotographic system in which toner of four colors of yellow Y, magenta M, cyan C, and black K (black) is primarily transferred to an intermediate transfer belt and then secondarily transferred to an image forming medium to form an image.
- An intermediate transfer tandem type color image forming apparatus is an electrophotographic system in which toner of four colors of yellow Y, magenta M, cyan C, and black K (black) is primarily transferred to an intermediate transfer belt and then secondarily transferred to an image forming medium to form an image.
- An intermediate transfer tandem type color image forming apparatus is an electrophotographic system in which toner of four colors of yellow Y, magenta M, cyan C, and black K (black) is
- the image forming apparatus A includes an image forming unit that transfers a toner image to a sheet, a sheet feeding unit that supplies the sheet to the image forming unit, a fixing unit that fixes the toner image on the sheet, Is provided.
- the image forming unit includes a plurality of photosensitive drums 1 (1Y, 1M, 1C, and 1K) as rotatable photoconductors, and a charging roller 2 (2Y, 2) that charges the photosensitive drum 1. 2M, 2C, 2K).
- the image forming apparatus includes an intermediate transfer unit 10, a laser scanner unit 3 (3Y, 3M, 3C, 3K), a developing device 4 (4Y, 4M, 4C, 4K), a cleaning blade 6 (6Y, 6M, 6C, 6K), and the like.
- the intermediate transfer unit 10 is supported by the apparatus main body, and includes a plurality of primary transfer rollers 5 (5Y, 5M, 5C, and 5K), a secondary transfer roller 9, a secondary transfer counter roller 8, and a cleaning device 11 as transfer members.
- a plurality of primary transfer rollers 5 (5Y, 5M, 5C, and 5K)
- a secondary transfer roller 9 a secondary transfer counter roller 8
- a cleaning device 11 as transfer members.
- an intermediate transfer belt 7 intermediate transfer member that is an endless cylindrical belt is provided.
- the intermediate transfer belt 7 is installed on a belt frame (not shown) and is stretched by a secondary transfer counter roller 8, a first tension roller 17, a second tension roller 18, and a separation roller 19. That is, the intermediate transfer belt 7 is stretched by a plurality of stretching rollers.
- the sheet S stacked and stored in the sheet stacking unit 12 by the feeding roller 13 adopting the frictional separation method is sent to the registration roller 14 through the conveyance path. Thereafter, the sheet is subjected to skew correction and timing correction by the registration roller 14 and then sent to the image forming unit.
- the image forming unit first, the surface of the photosensitive drum 1 is charged by the charging roller 2.
- the laser scanner unit 3 emits laser light from a light source (not shown) provided inside, and irradiates the photosensitive drum 1 with laser light according to image information. As a result, an electrostatic latent image corresponding to the image information is formed on the surface of the photosensitive drum 1.
- a toner image (developer image) is formed on the photosensitive drum 1 by developing the electrostatic latent image with the developing device 4 attached with toner.
- a two-component developer including a non-magnetic toner and a magnetic carrier is used as a developer, a one-component developer composed only of a magnetic toner or a non-magnetic toner may be used.
- the toner image formed on the photosensitive drum 1 in the primary transfer nip N (NY, NM, NC, NK) where the primary transfer electric field is formed by applying the primary transfer bias to the primary transfer roller 5 is Primary transfer is performed on the intermediate transfer belt 7 respectively.
- each primary transfer roller 5 is arranged offset from each photosensitive drum 1 on the downstream side in the moving direction of the intermediate transfer belt 7 by a distance L3.
- the contact point P4 is a downstream end portion of a region where the photosensitive drums 1 and the intermediate transfer belt 7 are in contact with each other, and the photosensitive drums 1 and the intermediate transfer belt start to be separated from each other.
- Position (first position) is an upstream end portion of a region where the intermediate transfer belt 7 and each primary transfer roller 5 are in contact with each other, and a position at which the intermediate transfer belt 7 and each primary transfer roller 5 start to contact (second position). ).
- the distance L3 is in the range of 3.5 to 7.0 mm. Further, although the distance L3 is the same in each image forming unit, at least one of the distances L3 may be set to a different value.
- the primary transfer roller 5 is made of a conductor having a volume resistance of 600 ⁇ cm or less, such as metal or conductive resin.
- the intermediate transfer belt 7 rotates in the arrow X direction when the secondary transfer counter roller 8 receives the driving force from the driving source and rotates in the arrow R1 direction.
- the primary transferred toner image reaches the secondary transfer portion formed by the secondary transfer counter roller 8 and the secondary transfer roller 9 which are downstream in the rotation direction due to the rotation of the intermediate transfer belt 7. It is transferred to the sheet.
- the sheet on which the toner image has been transferred is sent to the fixing device 15, heated and pressurized to fix the toner image on the sheet, and then discharged to the discharge tray 16.
- the toner of each color stored in the toner storage container 21 (21Y, 21M, 21C, 21K) is transferred by the toner supply device 22 (22Y, 22M, 22C, 22K). Each is supplied to the developing device 4.
- the toner replenishing devices 22M, 22C, and 22K are not shown, but have the same shape as the toner replenishing device 22Y.
- FIG. 3 is a perspective view of the intermediate transfer unit 10.
- 3A shows a state where the intermediate transfer belt 7 is installed and stretched
- FIG. 3B shows a state where the intermediate transfer belt 7 is removed.
- the intermediate transfer unit 10 includes a front frame 23F and a rear frame 23R.
- the front frame 23F is disposed on the side illustrated in FIG. 1 in the rotation axis direction of the primary transfer roller 5, and the rear frame 23R is disposed on the opposite side.
- front frame 23F and the rear frame 23R can rotate both ends in the rotation axis direction of these members by sandwiching the secondary transfer counter roller 8, the second tension roller 18, the separation roller 19, the separation shaft 28, and the like. Pivot.
- a drive coupling 24 is attached to one end of the rotation shaft of the secondary transfer counter roller 8.
- a driving force is transmitted to the drive coupling 24 by being connected to an output shaft of a belt drive unit (not shown) for driving the intermediate transfer belt 7.
- the secondary transfer counter roller 8 having a surface with a relatively high friction coefficient such as rubber rotates, thereby rotating the intermediate transfer belt 7 in the direction of the arrow X.
- the drive coupling 24 is used as the drive transmission means.
- the drive coupling 24 may be connected using a gear.
- a gear 33 is provided at one end of the separation shaft 28 in the axial direction.
- a separation coupling 30 and gears 31, 32 connected to an output shaft of a separation drive unit (not shown) are provided. Then, the drive force transmitted to the separation coupling 30 from a separation drive unit (not shown) is transmitted to the gear 33 via the gears 31 and 32, whereby the separation shaft 28 rotates.
- the front frame 23F and the rear frame 23R are provided with a pair of tension bearings 25.
- the tension bearing 25 pivotally supports both ends in the direction of the rotation axis so as to sandwich the first tension roller 17.
- the tension spring 26 biasing member
- the tension spring 26 biasing member
- the tension spring 26 is contracted between the front frame 23F and the rear frame 23R and the tension bearing 25. It is provided in the state.
- a tension force acting on the inner periphery of the intermediate transfer belt 7 is applied to the first tension roller 17 by the urging force of the tension spring 26.
- the intermediate transfer unit 10 includes a power feeding unit 27 (27Y, 27M, 27C, 27K).
- the power feeding unit 27 feeds power to the corresponding primary transfer roller 5 corresponding to the primary transfer bias. Note that a description of a main body power supply configuration from a high voltage substrate (not shown) provided in the image forming apparatus A to the power supply unit 27 is omitted.
- the primary transfer rollers 5Y, 5M, and 5C (first transfer members) other than the black K are in contact with the intermediate transfer belt 7 when the separation slider 40 operates when the monochrome mode and the color mode are switched. Move to a separation position that is separated from the position.
- FIG. 4 is a schematic cross-sectional view of the separation slider 40.
- the separation slider 40 has an elevating surface 41 (41Y, 41M, 41C) for moving up and down the primary transfer rollers 5 (5Y, 5M, 5C) other than the black K primary transfer roller 5K. Further, it has an elevating surface 42 for elevating and lowering the separation roller 19, a spring seat elevating surface 43, and a slide urging surface 44.
- the separation slider 40 is provided in each of the front frame 23F and the rear frame 23R, and has a symmetrical shape in the rotation axis direction of the primary transfer roller 5.
- FIG. 5 is a cross-sectional view for explaining the operation of the primary transfer roller 5 and the separation roller 19 moving to the separation position.
- FIG. 5A shows the state of the color mode
- FIG. 5B shows the state of the monochrome mode.
- each primary transfer roller 5 is pivotally supported by a pair of primary transfer bearings 34 (34Y, 34M, 34C, 34K) so that both ends can be rotated.
- the primary transfer bearing 34 is fitted and held so as to be vertically movable up and down while the movement of the intermediate transfer belt 7 in the moving direction is restricted by the front frame 23F and the rear frame 23R. And it is urged
- the separation roller 19 that stretches the intermediate transfer belt 7 is also arranged at a position adjacent to the upstream side of the primary transfer roller 5Y at the most upstream position with respect to the moving direction of the intermediate transfer belt 7. Further, both end portions are pivotally supported by a separation roller bearing 36 so as to be rotatable. Further, the movement in the moving direction of the intermediate transfer belt 7 is restricted by the front frame 23F and the rear frame 23R, and is fitted and held so as to be movable up and down in the vertical direction. Further, it is urged together with the separation roller 19 downward by the separation roller spring 39 in the vertical direction.
- a separation cam 37 as a cam member is provided at both ends of the separation shaft 28.
- the separation slider 40 and the separation cam 37 are moving mechanisms that can move the primary transfer rollers 5Y, 5M, and 5C to the contact position and the separation position, and the movement is controlled by the rotation of the separation cam 37. is doing. Further, the elevating surfaces 41Y, 41M, 41C (guide portions) of the separation slider 40 guide the protrusions 34Ya, 34Ya, 34Ma (guided portions), whereby the primary transfer rollers 5Y, 5M, 5C move.
- the protrusion 36 a included in the separation roller bearing 36 is pushed up by the elevating surface 42, and the separation roller 19 moves away from the intermediate transfer belt 7 from the position before the movement (third position).
- the movement amount of the separation roller 19 is set to be smaller than the movement amount of the primary transfer rollers 5Y, 5M, and 5C. Accordingly, the position (fourth position) of the separation roller 19 after movement is closer to the intermediate transfer position than the positions of the primary transfer rollers 5Y, 5M, and 5C after movement, and the intermediate transfer belt 7 is separated from the separation roller 19. (Fig. 5B)).
- FIG. 6 is a cross-sectional view of the intermediate transfer unit 10 in the monochrome mode and the color mode.
- FIG. 6A shows the state of the color mode
- FIG. 6B shows the state of the monochrome mode.
- the extra length of the intermediate transfer belt 7 caused by the change in the tension layout of the intermediate transfer belt 7 due to the mode change is that the tension roller 17 is positioned from the position indicated by the broken line in FIG. It is absorbed by moving to.
- the tension of the intermediate transfer belt 7 decreases, and the tension of the intermediate transfer belt 7 at the primary transfer nip portion NK also decreases.
- the change in the primary transfer current is suppressed by reducing the biasing force of the primary transfer spring 35K with the following configuration to suppress the change in the position of the primary transfer roller 5K due to the change in the tension layout. Suppress the occurrence of image defects.
- variable spring seat 38 first support portion on which the primary transfer spring 35K is installed
- the movement of the intermediate transfer belt 7 in the moving direction is regulated by the front frame 23F and the rear frame 23R. It is fitted and held so as to be movable up and down in the vertical direction.
- the primary transfer spring 35K (elastic member) is urged in the K2 direction, which is above the vertical direction.
- variable spring seat 38 When the color mode is switched to the monochrome mode, the protrusion 38 a included in the variable spring seat 38 is pushed up by the spring seat lifting / lowering surface 43 of the separation slider 40 due to the slide of the separation slider 40 in the direction of the arrow K1 accompanying the rotation of the separation cam 37. It is done. That is, the variable spring seat 38 moves to a position away from the intermediate transfer belt 7 in conjunction with the movement of the primary transfer rollers 5Y, 5M, and 5C to the separated position separated from the intermediate transfer belt 7. Further, the movement is performed by guiding the projection 38a as the guided portion to the spring seat lifting surface 43 as the guide portion.
- the separation slider 40 and the separation cam 37 move the variable spring seat 38 away from the intermediate transfer belt 7 in conjunction with the movement of the primary transfer rollers 5Y, 5M, and 5C to the separation position separated from the intermediate transfer belt 7. It is an interlocking mechanism that moves it.
- the urging force of the primary transfer spring 35K which is a spring member, is smaller when the primary transfer rollers 5Y, 5M, and 5C are in the separated position than when they are in the contact position. For this reason, the urging force of the primary transfer roller 5K (second transfer member) against the intermediate transfer belt 7 by the primary transfer spring 35K is reduced. At this time, the urging force of the primary transfer spring 35K and the amount of movement of the variable spring seat 38 are such that the distance L3 from the contact P4 to the contact P5 shown in FIG. 2 during image formation does not change between the monochrome mode and the color mode. Set to.
- the biasing force of the primary transfer roller 5K to the intermediate transfer belt 7 changes depending on the magnitude of the primary transfer bias, in addition to switching the tension layout of the intermediate transfer belt 7, so that it is set in consideration thereof. I do. That is, the primary transfer bearing 34K (second support portion), the primary transfer spring 35K, the variable spring seat 38, the separation slider 40, and the separation cam 37 change the urging force that urges the primary transfer roller 35K to the intermediate transfer belt 7. Change mechanism.
- the changing mechanism includes the above interlocking mechanism.
- switching from the monochrome mode to the color mode is performed in an operation reverse to the above-described separation operation by rotating the separation cam 37 by 90 degrees in the direction opposite to the arrow R2 direction shown in FIG.
- the compression spring is used as the biasing means for biasing the primary transfer roller 5K.
- the present invention is not limited to this. That is, when a part of the plurality of primary transfer rollers 5 is separated from the intermediate transfer belt 7, the biasing force for biasing the non-separated primary transfer roller 5 against the intermediate transfer belt 7 is small. Good. Furthermore, the effects of the present invention can be obtained even with a configuration in which the primary transfer roller 5 is pressed against the intermediate transfer belt 7 by a configuration other than urging the primary transfer roller 5.
- the present invention is not limited to this. That is, even when the primary transfer roller that transfers the developer of the color that is frequently used to the intermediate transfer belt 7 is not separated or the primary transfer rollers of a plurality of colors are not separated, the effect of the present invention is achieved. Obtainable.
- the present invention relates to an image forming apparatus and has industrial applicability.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Electrostatic Charge, Transfer And Separation In Electrography (AREA)
Abstract
Description
<画像形成装置>
まず本発明の第1実施形態に係る中間転写ユニットを備える画像形成装置Aの全体構成を画像形成時の動作とともに図面を参照しながら説明する。
次に、中間転写ユニット10の構成について説明する。図3は中間転写ユニット10の斜視図である。なお、図3(a)は中間転写ベルト7が設置、張架された状態を示し、図3(b)は中間転写ベルト7が取り外された状態を示す。
次に、転写部材である一次転写ローラ5の移動について説明する。ブラックK以外の一次転写ローラ5Y、5M、5C(第1の転写部材)は、モノクロモードとカラーモードが切り換えられたときに離間スライダー40が動作することにより、中間転写ベルト7と当接する当接位置から離間する離間位置に移動する。
5…一次転写ローラ
7…中間転写ベルト
10…中間転写ユニット
19…離間ローラ
35…一次転写ばね
37…離間カム
38…可変ばね座
40…離間スライダー
43…ばね座昇降面
A…画像形成装置
Claims (9)
- 画像形成装置に支持される中間転写ユニットであって、
第1と第2の感光体の表面にそれぞれに形成された現像剤像が転写される無端状の中間転写ベルトと、
前記第1と第2の感光体のそれぞれに対応して配置され、前記中間転写ベルトの内周面に当接して前記中間転写ベルトに前記現像剤像を転写する第1と第2の転写部材であって、前記中間転写ベルトの移動方向において、前記転写する際の前記感光体と前記中間転写ベルトとが当接している領域の下流側端部である第1の位置が、前記感光体に対応する前記転写部材と前記中間転写ベルトとが当接している領域の上流側端部である第2の位置より上流側になるようにそれぞれ配置される第1と第2の転写部材と、
前記第1の転写部材を前記中間転写ベルトに当接させる当接位置と、前記中間転写ベルトから離間させる離間位置と、に移動可能な移動機構と、
前記第2の転写部材を前記中間転写ベルトに付勢する付勢力を変更する変更機構であって、前記第1の転写部材が前記離間位置にあるときの付勢力が、前記当接位置にあるときの付勢力より弱くなるように前記付勢力を変更する変更機構と、
を有することを特徴とする中間転写ユニット。 - 前記変更機構は、前記第1の転写部材が前記当接位置にあるときと前記離間位置にあるときとで、前記中間転写ベルトに沿った前記第1の位置と前記第2の位置との間の距離が同じになるように前記付勢力を変更することを特徴とする請求項1に記載の中間転写ユニット。
- 前記変更機構は、位置の変更がされる第1の支持部と、前記第2の転写部材を支持する第2の支持部と、前記第1の支持部と前記第2の支持部との間に配置され、前記付勢力を発生させる弾性部材と、を有し、
前記変更機構における前記第1の支持部の位置は、前記第1の転写部材が前記離間位置にあるときの方が、前記第1の転写部材が前記当接位置にあるときよりも前記中間転写ベルトから離れた位置になるように移動されることを特徴とする請求項1又は請求項2に記載の中間転写ユニット。 - 前記変更機構は、前記移動機構による前記第1の転写部材の前記当接位置と前記離間位置との間の移動に連動して、前記第1の支持部を移動させる連動機構を有することを特徴とする請求項3に記載の中間転写ユニット。
- 前記連動機構には、カム部材が含まれ、前記カム部材が移動されることにより前記第1の支持部が移動されることを特徴とする請求項4に記載の中間転写ユニット。
- 前記第1の転写部材を複数有し、前記中間転写ベルトの移動方向について最上流の位置にある前記第1の転写部材の上流側に隣接する位置に前記中間転写ベルトを内周面側から張架する張架部材を備え、前記当接位置から前記離間位置への前記第1の転写部材の移動に伴って、前記張架部材は第3の位置から、前記第3の位置よりも前記中間転写ベルトの張力を低下させる第4の位置に移動することを特徴とする請求項1乃至5のいずれか1項に記載の中間転写ユニット。
- 前記中間転写ベルトの内周面に当接して前記中間転写ベルトに張力を付与するテンションローラを含み、前記中間転写ベルトを張架する複数の張架ローラと、前記複数の張架ローラを支持するフレームと、前記フレームに対して移動可能に支持され、前記テンションローラを回転可能に支持するテンション軸受と、前記テンション軸受と前記フレームとの間に配置され、前記テンションローラに付勢力を付与するテンションばねと、を有することを特徴とする請求項1乃至6のいずれか1項に記載の中間転写ユニット。
- 前記第2の転写部材は、黒色の現像剤像を前記中間転写ベルトに転写する転写部材であることを特徴とする請求項1乃至7のいずれか1項に記載の中間転写ユニット。
- 第1と第2の感光体と、
請求項1乃至8のいずれか1項に記載の中間転写ユニットと、
を有することを特徴とする画像形成装置。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020187029299A KR20180123094A (ko) | 2016-04-14 | 2017-03-21 | 중간 전사 유닛 및 화상 형성 장치 |
EP17782186.5A EP3444679A1 (en) | 2016-04-14 | 2017-03-21 | Intermediate transfer unit and image forming device |
CN201780023231.6A CN109074020A (zh) | 2016-04-14 | 2017-03-21 | 中间转印单元和成像设备 |
US16/155,224 US10317821B2 (en) | 2016-04-14 | 2018-10-09 | Intermediate transfer unit and image forming apparatus |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2016080717A JP6708469B2 (ja) | 2016-04-14 | 2016-04-14 | 中間転写ユニット及び画像形成装置 |
JP2016-080717 | 2016-04-14 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US16/155,224 Continuation US10317821B2 (en) | 2016-04-14 | 2018-10-09 | Intermediate transfer unit and image forming apparatus |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2017179368A1 true WO2017179368A1 (ja) | 2017-10-19 |
Family
ID=60041721
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2017/011113 WO2017179368A1 (ja) | 2016-04-14 | 2017-03-21 | 中間転写ユニット及び画像形成装置 |
Country Status (6)
Country | Link |
---|---|
US (1) | US10317821B2 (ja) |
EP (1) | EP3444679A1 (ja) |
JP (1) | JP6708469B2 (ja) |
KR (1) | KR20180123094A (ja) |
CN (1) | CN109074020A (ja) |
WO (1) | WO2017179368A1 (ja) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP7433780B2 (ja) * | 2019-05-31 | 2024-02-20 | キヤノン株式会社 | 画像形成装置 |
US11526101B2 (en) * | 2020-09-09 | 2022-12-13 | Canon Kabushiki Kaisha | Monochrome image forming apparatus capable of suppressing increase of torque in changing stretched form of intermediate transfer belt |
JP2023000341A (ja) * | 2021-06-17 | 2023-01-04 | キヤノン株式会社 | 画像形成装置 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008298835A (ja) * | 2007-05-29 | 2008-12-11 | Kyocera Mita Corp | 画像形成装置 |
JP2011186106A (ja) * | 2010-03-08 | 2011-09-22 | Sharp Corp | 転写装置 |
JP2012159571A (ja) * | 2011-01-31 | 2012-08-23 | Kyocera Document Solutions Inc | 中間転写ユニット及びそれを備えたカラー画像形成装置 |
US20130136498A1 (en) * | 2011-11-29 | 2013-05-30 | Samsung Electronics Co., Ltd. | Transfer device and image forming apparatus having the same |
JP2015087714A (ja) * | 2013-11-01 | 2015-05-07 | カシオ電子工業株式会社 | 画像形成装置 |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3992704B2 (ja) * | 2004-09-28 | 2007-10-17 | シャープ株式会社 | 転写ベルト装置及び画像形成装置 |
JP5151929B2 (ja) * | 2008-11-25 | 2013-02-27 | コニカミノルタビジネステクノロジーズ株式会社 | 画像形成装置 |
JP4748243B2 (ja) * | 2009-03-27 | 2011-08-17 | 富士ゼロックス株式会社 | 中間転写装置、転写装置および画像形成装置 |
JP5014455B2 (ja) * | 2010-04-12 | 2012-08-29 | シャープ株式会社 | 転写装置及び画像形成装置 |
JP2012247756A (ja) | 2011-05-31 | 2012-12-13 | Canon Inc | 画像形成装置 |
JP2014106442A (ja) * | 2012-11-29 | 2014-06-09 | Kyocera Document Solutions Inc | 中間転写ユニット及びそれを備えたカラー画像形成装置 |
JP2017015775A (ja) * | 2015-06-26 | 2017-01-19 | キヤノン株式会社 | 画像形成装置 |
-
2016
- 2016-04-14 JP JP2016080717A patent/JP6708469B2/ja not_active Expired - Fee Related
-
2017
- 2017-03-21 WO PCT/JP2017/011113 patent/WO2017179368A1/ja active Application Filing
- 2017-03-21 CN CN201780023231.6A patent/CN109074020A/zh active Pending
- 2017-03-21 KR KR1020187029299A patent/KR20180123094A/ko active IP Right Grant
- 2017-03-21 EP EP17782186.5A patent/EP3444679A1/en not_active Withdrawn
-
2018
- 2018-10-09 US US16/155,224 patent/US10317821B2/en not_active Expired - Fee Related
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008298835A (ja) * | 2007-05-29 | 2008-12-11 | Kyocera Mita Corp | 画像形成装置 |
JP2011186106A (ja) * | 2010-03-08 | 2011-09-22 | Sharp Corp | 転写装置 |
JP2012159571A (ja) * | 2011-01-31 | 2012-08-23 | Kyocera Document Solutions Inc | 中間転写ユニット及びそれを備えたカラー画像形成装置 |
US20130136498A1 (en) * | 2011-11-29 | 2013-05-30 | Samsung Electronics Co., Ltd. | Transfer device and image forming apparatus having the same |
JP2015087714A (ja) * | 2013-11-01 | 2015-05-07 | カシオ電子工業株式会社 | 画像形成装置 |
Also Published As
Publication number | Publication date |
---|---|
CN109074020A (zh) | 2018-12-21 |
KR20180123094A (ko) | 2018-11-14 |
JP2017191216A (ja) | 2017-10-19 |
US20190041774A1 (en) | 2019-02-07 |
JP6708469B2 (ja) | 2020-06-10 |
US10317821B2 (en) | 2019-06-11 |
EP3444679A1 (en) | 2019-02-20 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP6187857B2 (ja) | 転写装置、及び画像形成装置 | |
US7672605B2 (en) | Transfer device and image forming apparatus | |
JP6288320B2 (ja) | 画像形成装置 | |
US10322893B2 (en) | Image forming apparatus | |
JP4697296B2 (ja) | 一次転写装置及びこれを備えた画像形成装置 | |
US10317821B2 (en) | Intermediate transfer unit and image forming apparatus | |
JP6380835B2 (ja) | 転写装置及び画像形成装置 | |
CN102998950B (zh) | 带驱动装置 | |
JP5448051B2 (ja) | 画像形成装置 | |
JP7229695B2 (ja) | 画像形成装置 | |
JP2017076079A (ja) | 転写装置及び画像形成装置 | |
JP7433780B2 (ja) | 画像形成装置 | |
JP2014142540A (ja) | 画像形成装置 | |
JP2013109378A (ja) | 画像形成装置 | |
JP2011033771A (ja) | 用紙搬送装置及び画像形成装置 | |
JP2017026724A (ja) | 画像形成装置 | |
JP2024015644A (ja) | 画像形成装置 | |
JP2015060030A (ja) | 画像形成装置 | |
JP6016094B2 (ja) | 転写装置及び画像形成装置 | |
JP2018092090A (ja) | 画像形成装置 | |
JP2023034374A (ja) | 付勢力調整装置、転写装置および画像形成装置 | |
JP2014038270A (ja) | ベルトユニット及び画像形成装置 | |
JP2017045015A (ja) | 画像形成装置 | |
JP2014203047A (ja) | 転写装置、画像形成装置 | |
JP2008145537A (ja) | 画像形成装置 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
ENP | Entry into the national phase |
Ref document number: 20187029299 Country of ref document: KR Kind code of ref document: A |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2017782186 Country of ref document: EP |
|
ENP | Entry into the national phase |
Ref document number: 2017782186 Country of ref document: EP Effective date: 20181114 |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 17782186 Country of ref document: EP Kind code of ref document: A1 |