WO2021054292A1 - 画像形成装置 - Google Patents
画像形成装置 Download PDFInfo
- Publication number
- WO2021054292A1 WO2021054292A1 PCT/JP2020/034778 JP2020034778W WO2021054292A1 WO 2021054292 A1 WO2021054292 A1 WO 2021054292A1 JP 2020034778 W JP2020034778 W JP 2020034778W WO 2021054292 A1 WO2021054292 A1 WO 2021054292A1
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- WO
- WIPO (PCT)
- Prior art keywords
- recording medium
- image forming
- image
- transfer
- forming apparatus
- Prior art date
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Definitions
- the present invention relates to an image forming apparatus.
- Patent Document 1 discloses a configuration in which a gripper provided on the peripheral surface of a transport drum grips the tip of the paper to transport the paper.
- the image forming portion for forming an image on the recording medium and the fixing portion for fixing the image on the recording medium are respectively orbited.
- An object of the present invention is to save space in an image forming apparatus.
- the image forming apparatus has a first body supporting a recording medium and a first rotating body arranged at an axial end of the first body, and the recording medium has a first body of revolution. It has an image forming portion for forming an image, a second body supporting the recording medium, and a second rotating body arranged at the axial end of the second body, and heats or dries the recording medium. By doing so, the fixing portion for fixing the image on the recording medium, the first rotating body and the second rotating body are stretched, and the first rotating body and the second rotating body rotate with the rotation of the first rotating body and the second rotating body.
- a transport unit having an orbiting member and a holding portion attached to the orbiting member and holding the recording medium, and transporting the recording medium from the image forming portion to the fixing portion by orbiting the orbiting member. To be equipped.
- the image forming apparatus according to the second aspect of the present invention is the image forming apparatus of the first aspect, and the orbiting member is wound around the first rotating body and the second rotating body.
- the image forming apparatus is the image forming apparatus of the second aspect, and the maximum width of the transport portion in the width direction of the image forming apparatus is such that the circumferential member is the first rotating body. It is the length from the wound portion to the portion wound around the second rotating body.
- the image forming apparatus is an image forming apparatus according to any one of the first to third aspects, and the image forming portion is an annular transfer belt on which an image is transferred to an outer surface.
- the first cylinder is a transfer cylinder having a transfer region for transferring the image from the transfer belt to the recording medium with the recording medium sandwiched between the outer surface of the transfer belt and the fixing portion.
- the pressurizing roll further has a heating portion and has a fixing region for fixing the image to the recording medium by sandwiching the recording medium with the outer surface of the heating portion. The medium is conveyed and passed through the transfer region and the fixation region.
- the image forming apparatus is the image forming apparatus of the fourth aspect, which is provided between the image forming portion and the fixing portion in the transport direction of the recording medium, and is the recording medium.
- a non-contact heating unit that heats the image transferred to the image in a non-contact manner is further provided.
- the image forming apparatus is the image forming apparatus of the fifth aspect, which faces the non-contact heating portion with the orbiting member interposed therebetween, and is conveyed by the conveying portion.
- a blower portion for blowing air to the back surface of the medium opposite to the surface on which the image is transferred is further provided.
- the image forming apparatus according to the seventh aspect of the present invention is an image forming apparatus according to any one of the fourth to sixth aspects, and the outer diameter of the first rotating body is larger than the outer diameter of the transfer cylinder. Is also small.
- the image forming apparatus is an image forming apparatus according to any one of the fourth to seventh aspects, and the transfer cylinder is wound around a base material and the outer periphery of the base material. It has a surface layer that can be exchanged with respect to the base material.
- the image forming apparatus according to the ninth aspect of the present invention is an image forming apparatus according to any one of the fourth to eighth aspects, and the outer diameter of the second rotating body is the outer diameter of the pressure roll. Smaller than
- the image forming apparatus is an image forming apparatus according to any one of the fourth to ninth aspects, and the pressure roll is wound around a base material and the outer periphery of the base material. It also has a surface layer that is interchangeable with respect to the substrate.
- the orbiting member is bridged between the first rotating body and the second rotating body, and the other rotating bodies arranged on both sides of the first rotating body and the second rotating body, respectively. It is possible to save space in the image forming apparatus as compared with the configuration in which the image forming apparatus is wrapped around the body.
- the maximum width of the transport portion in the width direction of the image forming apparatus is such that the circumferential member is arranged on both sides of the first rotating body and the second rotating body, respectively. It is possible to save space in the image forming apparatus as compared with the configuration in which the length is up to the portion wrapped around the body.
- the heat of the fixing portion does not easily affect the transfer cylinder.
- the image on the back surface of the recording medium is suppressed from being disturbed as compared with the case where the heating means for heating the image transferred to the recording medium has a contact portion in contact with the back surface of the recording medium. Will be done.
- the recording medium when the recording medium is conveyed while facing the front surface to the non-contact heating portion, the recording medium is in a windless state in which no wind is sent to the back surface of the recording medium. It is suppressed that the back surface in the image area comes into contact with the constituent members of the device.
- the recording medium is conveyed to the transfer cylinder and the transfer belt in the transfer region as compared with the configuration in which the outer diameter of the first rotating body is larger than the outer diameter of the transfer cylinder. The deviation to the downstream side in the direction is suppressed.
- the eighth aspect of the present invention when the surface layer deteriorates, it is not necessary to replace the transfer portion including the first rotating body.
- the recording medium is downstream in the transport direction with respect to the heating roll in the fixing region, as compared with the configuration in which the outer diameter of the second rotating body is larger than the outer diameter of the pressure roll. The shift to the side is suppressed.
- FIG. 1 is a schematic view showing a configuration of an image forming apparatus 10 according to the present embodiment.
- the image forming apparatus 10 shown in FIG. 1 is an example of an image forming apparatus that forms an image on a recording medium.
- the image forming apparatus 10 is an electrophotographic image forming apparatus that forms a toner image (an example of an image) on a recording medium P.
- the image forming apparatus 10 includes an image forming unit 14, a conveying unit 15, and a fixing device 16.
- each part of the image forming apparatus 10 that is, the image forming portion 14, the conveying portion 15, and the fixing device 16
- the image forming apparatus 10 that is, the image forming portion 14, the conveying portion 15, and the fixing device 16
- the image forming unit 14 has a function of forming a toner image (an example of an image) on the recording medium P.
- the image forming unit 14 includes a toner image forming unit 22 and a transfer device 17.
- Toner image forming unit 22 A plurality of toner image forming portions 22 shown in FIG. 1 are provided so as to form a toner image for each color.
- a toner image forming unit 22 having a total of four colors of yellow (Y), magenta (M), cyan (C), and black (K) is provided.
- (Y), (M), (C), and (K) shown in FIG. 1 indicate components corresponding to the above colors.
- the toner image forming unit 22 of each color has a photoconductor drum 32 which is a photoconductor that rotates in one direction (for example, the counterclockwise direction in FIG. 1). Further, the toner image forming unit 22 of each color includes a charger 23, an exposure device 36, a developing device 38, and a removing device 40.
- the charger 23 charges the photoconductor drum 32. Further, the exposure device 36 exposes the photoconductor drum 32 charged by the charger 23 to form an electrostatic latent image on the photoconductor drum 32.
- the developing device 38 develops the electrostatic latent image formed on the photoconductor drum 32 by the exposure device 36 to form a toner image.
- the removing device 40 removes the toner remaining on the photoconductor drum 32 after the toner image is transferred to the transfer belt 24 described later.
- the transfer device 17 includes a transfer belt 24, a primary transfer roll 26, a secondary transfer body 27, and a charger 60.
- the transfer device 17 shown in FIG. 1 is a device that transfers the toner image formed by the toner image forming unit 22 to the recording medium P. Specifically, the transfer device 17 superimposes the toner image of the photoconductor drum 32 of each color on the transfer belt 24 as an intermediate transfer body for primary transfer, and transfers the superimposed toner image to the secondary transfer position T2 (that is, that is). , Secondary transfer to the recording medium P in the nip region 28A) described later.
- the primary transfer roll 26 shown in FIG. 1 is a roll that transfers the toner image of the photoconductor drum 32 of each color to the transfer belt 24 at the primary transfer position T1 between the photoconductor drum 32 and the primary transfer roll 26. ..
- the toner image formed on the photoconductor drum 32 is transferred to the transfer belt 24 at the primary transfer position T1 by applying the primary transfer electric field between the primary transfer roll 26 and the photoconductor drum 32. Transcribed.
- the transfer belt 24 shown in FIG. 1 is an example of an annular transfer belt on which an image is transferred to an outer surface.
- the toner image is transferred from the photoconductor drum 32 of each color to the outer peripheral surface (an example of the outer surface).
- the transfer belt 24 is configured as follows.
- the transfer belt 24 is annular, as shown in FIG. Further, the transfer belt 24 is wound around a plurality of rolls 42 including the drive roll 42D, the winding rolls 42E, and 42F, and the posture is determined.
- the transfer belt 24, for example, is rotated in the predetermined arrow A direction (hereinafter referred to as belt circumferential direction A) by rotationally driving the drive roll 42D among the plurality of rolls 42 by a drive unit (not shown). To do.
- the specific configurations of the winding rolls 42E and 42F will be described later.
- the secondary transfer member 27 is an example of a transfer unit. Specifically, as shown in FIG. 2, the secondary transfer body 27 has a transfer body 28 as an example of the first body and a pair of sprockets 29.
- the transfer cylinder 28 is an example of a transfer cylinder having a transfer region for transferring an image from the transfer belt to the recording medium by sandwiching the recording medium with the outer surface of the transfer belt.
- the transfer cylinder 28 has a nip region 28A (an example of a transfer region) that sandwiches the recording medium P with the outer peripheral surface of the transfer belt 24.
- the nip region 28A is a region in which the recording medium P is sandwiched, it can be said to be a sandwiched region. Since the transfer cylinder 28 sandwiches the recording medium P with the transfer belt 24, it can be said to be a sandwiched portion.
- the recording medium P is simplified and a part thereof is shown.
- the nip region 28A is formed by winding the transfer belt 24 around the transfer cylinder 28 and partially covering (wrapping) the transfer cylinder 24 with the transfer belt 24.
- the nip region 28A can be said to be a contact region where the transfer belt 24 and the transfer cylinder 28 come into contact with each other.
- the nip region 28A is the secondary transfer position T2 at which the toner image is transferred from the transfer belt 24 to the recording medium P.
- the transfer cylinder 28 is conveyed by sandwiching the recording medium P with the transfer belt 24 in the nip region 28A.
- the recording medium P when transferring to a wide paper (wide recording medium) such as B2 size, the recording medium P may be violent in this transfer region or the recording medium P may flutter, resulting in an image to be transferred. There is a risk of misalignment or disorder.
- the nip region 28A in which the transfer belt 24 covers and contacts the transfer cylinder 28 suppresses the fluttering of the recording medium P and suppresses the deviation and disorder of the transferred image.
- the opposing member of the transfer cylinder 28 is a rotating body, if the radius of the transfer cylinder 28 is larger than the radius of the rotating body, the transfer belt 24 is more likely to cover the transfer cylinder 28, and the curvature of the covered region becomes larger. small.
- the pair of sprockets 29 is an example of the first rotating body.
- the pair of sprockets 29 are arranged at the axial end of the transfer cylinder 28, as shown in FIG. Specifically, the pair of sprockets 29 are arranged on both ends in the axial direction of the transfer cylinder 28. In other words, the transfer cylinder 28 is provided between the pair of sprockets 29.
- the pair of sprockets 29 are arranged coaxially with the transfer cylinder 28 and rotate integrally with the transfer cylinder 28.
- the secondary transfer body 27 is rotationally driven by a drive unit (not shown).
- the axial direction of the transfer cylinder 28 is the same as the device front-rear direction (D direction in FIG. 2).
- the outer diameter R1 of the pair of sprockets 29 is smaller than the outer diameter of the transfer cylinder 28.
- the outer diameter R1 of the sprocket 29 referred to here is the outer diameter including the teeth 29A (that is, the diameter of the tooth tip).
- the outer diameter R1 of the sprocket 29 is preferably in the range of 50% to 95%, more preferably in the range of 70% to 90% with respect to the outer diameter of the transfer cylinder 28. In other words, it is preferable to set the outer diameter R1 of the sprocket 29 so that the chain 52 does not protrude from the outer periphery of the transfer cylinder 28 at the portion wound around the sprocket 29 of the chain 52.
- the transfer cylinder 28 has a base material 28E and a surface layer 28F that is wound around the outer circumference of the base material 28E and can be exchanged with respect to the base material 28E.
- a metal material such as stainless steel is used.
- an elastic resin material such as urethane rubber, ethylene / propylene rubber (EPM), silicone rubber, fluororubber (FKM), and epichlorohydrin / butadiene rubber is used.
- the surface layer 28F is removably fixed to the base material 28E. Therefore, it is possible to remove the surface layer 28F with respect to the base material 28E and attach an unused surface layer 28F.
- the transfer cylinder 28 sandwiches the recording medium P between the surface layer 28F and the outer peripheral surface of the transfer belt 24 at a predetermined pressure to form a nip region 28A. Let it pass.
- two recesses 28D in which the gripper 54 and the mounting member 55 described later of the transport portion 15 are housed are formed.
- the number of recesses 28D may be one or three or more.
- the charger 60 is an example of an opposing portion that faces the sandwiching portion inside the transfer belt. As shown in FIG. 3, the charger 60 is arranged inside the transfer belt 24 so as to face the transfer cylinder 28. Specifically, the charger 60 faces the transfer cylinder 28 in a region including the center 28S of the transport portion 15 in the transport direction in the nip region 28A.
- the charger 60 is a charger (so-called corotron type charger) that transfers a toner image by corona discharge to transfer the toner image of the belt 24.
- the charger 60 has a discharge wire 60A and a case 62 which is a housing.
- the discharge wire 60A is a linear wire having a length extending along the axial direction of the transfer cylinder 28.
- the discharge wire 60A is non-contact with the inner surface of the transfer belt 24. That is, there is a gap between the discharge wire 60A and the inner surface of the transfer belt 24.
- Case 62 is an example of a surrounding portion surrounding the discharge wire.
- the case 62 is formed in a box shape and has an opening 62C on the transfer cylinder 28 side (that is, the lower side).
- the case 62 includes a first wall 62A arranged on the side opposite to the transfer cylinder 28 with respect to the discharge wire 60A, and a pair of cases arranged on the upstream side and the downstream side of the belt circumferential direction A with respect to the discharge wire 60A. It has a second wall 62B and. Further, the case 62 has third walls (not shown) arranged on both ends in the length direction of the discharge wire 60A.
- This case 62 is non-contact with the inner surface of the transfer belt 24. That is, there is a gap between the case 62 and the inner surface of the transfer belt 24.
- the case 62 may have openings in the third walls (not shown) arranged on both ends in the length direction of the discharge wire 60A, and the openings 62C may be provided at least on the transfer cylinder 28 side (that is, the lower side). Any configuration may be used.
- the recording medium P is electrostatically adsorbed on the transfer belt 24 and the transfer cylinder 28 by applying a voltage to the discharge wire 60A to discharge the battery.
- the transfer belt 24 is charged by the discharge of the discharge wire 60A, and the toner image superimposed on the transfer belt 24 is transferred from the transfer belt 24 to the recording medium P in the nip region 28A which is the secondary transfer position T2. Transcribe.
- the winding rolls 42E and 42F shown in FIGS. 1 and 3 are examples of a pair of winding rolls in which the transfer belt is wound inside the transfer belt.
- the winding rolls do not necessarily have to be a pair, and only one may be used.
- the winding rolls 42E and 42F are composed of rotating bodies, but the winding rolls are composed of sliding members such that a non-woven fabric or the like is adhered to the surface of a non-rotating metal body. May be good.
- the winding rolls 42E and 42F are arranged on the upstream side and the downstream side of the belt circumferential direction A with respect to the charger 60.
- the winding rolls 42E and 42F are arranged so that the common circumscribed line XA of the winding rolls 42E and 42F passes over the transfer cylinder 28 in the axial view of the winding rolls 42E and 42F. Has been done.
- the common circumscribed line XA is a tangent line in which the winding rolls 42E and 42F are arranged on the same side of the tangent line among the tangent lines tangent to both the winding rolls 42E and 42F (that is, the common tangent line). More specifically, the common circumscribed line XA according to the present embodiment is a tangent line in which the transfer belt 24 of the winding rolls 42E and 42F is in contact with the wound portion. In other words, the common circumscribed line XA according to the present embodiment is a tangent line that is in contact with the winding rolls 42E and 42F on the transfer cylinder 28 side with respect to the charger 60.
- both the winding portions 43E and 43F wound around the winding rolls 42E and 42F of the transfer belt 24 are separated from the transfer cylinder 28, but either of the winding portions 43E and 43F. , Or both may come into contact with the transfer cylinder 28.
- the winding portion 43E is a winding portion on the upstream side in the transport direction of the recording medium P with respect to the winding portion 43F.
- the fixing device 16 shown in FIG. 1 is a device that fixes the toner image transferred to the recording medium P by the transfer cylinder 28 to the recording medium P.
- the fixing device 16 has a heating roll 68 as a heating member, a pressure roll 69 as a pressure member, and a pair of sprockets 19. In FIG. 1, the sprocket 19 is omitted.
- the toner image formed on the recording medium P is fixed on the recording medium P by heating and pressurizing the recording medium P with the heating roll 68 and the pressure roll 69.
- the fixing device 16 is an example of a fixing portion.
- the pressure roll 69 is an example of the second body.
- the pair of sprockets 19 is an example of the second rotating body.
- the pair of sprockets 19 are arranged at the axial ends of the pressure roll 69.
- the pair of sprockets 19 are arranged on both ends in the axial direction of the pressure roll 69.
- a pressure roll 69 is provided between the pair of sprockets 19.
- the pair of sprockets 19 are arranged coaxially with the pressure roll 69 and rotate integrally with the pressure roll 69.
- the outer diameter R2 of the pair of sprockets 19 is smaller than the outer diameter of the pressure roll 69.
- the outer diameter R2 of the sprocket 19 referred to here is the outer diameter including the teeth 19A (that is, the diameter of the tooth tip).
- the outer diameter R2 of the sprocket 19 is preferably in the range of 50% to 95%, more preferably in the range of 70% to 90% with respect to the outer diameter of the pressure roll 69. In other words, it is preferable to set the outer diameter R2 of the sprocket 19 so that the chain 52 does not protrude from the outer circumference of the pressure roll 69 at the portion wound around the sprocket 19 of the chain 52.
- one recess 69D in which the gripper 54 and the mounting member 55 described later of the transport portion 15 are housed is formed on the outer circumference of the pressure roll 69.
- a plurality of recesses 69D may be formed according to the arrangement interval of the grippers 54 along the circumferential direction C of the chain 52.
- the pressure roll 69 has a base material 69E and a surface layer 69F that is wound around the outer circumference of the base material 69E and can be exchanged with respect to the base material 69E.
- a metal material such as stainless steel is used.
- an elastic material such as silicone rubber or a release layer made of PFA or the like is sequentially laminated on an elastic material such as silicone rubber.
- the surface layer 69F is removably fixed to the base material 69E. Therefore, it is possible to remove the surface layer 69F with respect to the base material 69E and attach an unused surface layer 69F.
- the transport unit 15 shown in FIGS. 1 to 3 and the like has a function of transporting the recording medium P from the image forming unit 14 to the fixing device 16.
- the transport unit 15 has a function of transporting the recording medium P and passing it through the nip region 28A of the image forming unit 14 and the nip region 69A of the fixing device 16 shown in FIG.
- the transport unit 15 includes a pair of sprockets 19, a pair of sprockets 29, a pair of sprockets 46, a pair of sprockets 47, a pair of sprockets 48, and a pair.
- the chain 52, the gripper 54, and the suction roll 59 are provided.
- the pair of chains 52 is an example of a circumferential member.
- the gripper 54 is an example of a holding unit that holds a recording medium.
- FIG. 1 the sprocket 46, the sprocket 47, the sprocket 48, the chain 52, and the gripper 54 are shown in a simplified manner, and the sprocket 19 and the sprocket 29 are omitted.
- the chain 52 and the gripper 54 are shown in a simplified manner.
- the pair of sprockets 46 are arranged on the lower side of the pair of sprockets 19 at intervals in the front-rear direction of the device.
- the pair of sprockets 46 are coaxially and integrally rotatable and supported by a device body (not shown) of the image forming apparatus 10.
- the pair of sprockets 47 are arranged on the lower side of the pair of sprockets 29 at intervals in the front-rear direction of the device.
- the pair of sprockets 47 are coaxially and integrally rotatable and supported by a device body (not shown) of the image forming apparatus 10.
- the pair of sprockets 48 are arranged between the pair of sprockets 46 and the pair of sprockets 47 in the device width direction (left-right direction in FIG. 1) and at intervals in the device front-rear direction. There is.
- the pair of sprockets 48 are coaxially and integrally rotatable and supported by a device body (not shown) of the image forming apparatus 10.
- These sprockets 46, 47, 48 have a function of properly maintaining the tension of the chain 52.
- the pair of chains 52 are formed in an annular shape as shown in FIG. As shown in FIG. 2, the pair of chains 52 are arranged at intervals in the front-rear direction of the device (D direction in FIG. 2).
- the pair of chains 52 are stretched on a pair of sprockets 19 provided on the pressure roll 69 and a pair of sprockets 29 provided on the transfer cylinder 28, respectively.
- the pair of chains 52 are wound around the pair of sprockets 19, 29, 46, 47, 48, respectively.
- the rotation of the transfer cylinder 28 having the pair of sprockets 29 causes the chain 52 to orbit in the circumferential direction C (direction of arrow C in FIG. 1).
- the chain 52 is wound so as to straddle at least a region of the nip region 28A facing the charger 60 in the circumferential direction C.
- the speed fluctuation of the recording medium P is suppressed at the secondary transfer position T2.
- the chain 52 is wound so as to straddle the entire nip region 28A.
- the speed fluctuation of the recording medium P is more reliably suppressed at the secondary transfer position T2.
- the winding angle at which the chain 52 is wound around the sprocket 29 is 90 degrees or more. Therefore, the recording medium P is easily conveyed following the surface of the transfer cylinder 28.
- the pair of sprockets 19, 46, 47, 48 are driven to rotate with respect to the rotation of the chain 52.
- the width from the portion where the chain 52 is wound around the sprocket 29 to the portion where the chain 52 is wound around the sprocket 19 when viewed from the front-rear direction of the device is the maximum width of the transport portion 15 in the device width direction.
- the sprockets 46, 47, 48 of the transport unit 15 are arranged in the region along the device width direction from the sprocket 19 to the sprocket 29.
- a mounting member 55 to which the gripper 54 is mounted is hung on the pair of chains 52 along the front-rear direction of the device.
- a plurality of mounting members 55 are fixed to a pair of chains 52 at predetermined intervals along the circumferential direction (circumferential direction C) of the chain 52.
- a plurality of grippers 54 are attached to the attachment member 55 at predetermined intervals along the front-rear direction of the device.
- the gripper 54 is attached to the chain 52 via the attachment member 55.
- the gripper 54 has a function of holding the front end portion of the recording medium P.
- the gripper 54 has a claw 54A and a claw base 54B as shown in FIG.
- the gripper 54 holds the recording medium P by sandwiching the front end portion of the recording medium P between the claw 54A and the claw base 54B.
- the gripper 54 is an example of a holding portion that holds the recording medium P in the thickness direction.
- the gripper 54 holds the front end portion of the recording medium P outside the image area of the recording medium P.
- the image area of the recording medium P is an area in which the toner image is transferred in the recording medium P.
- the claw 54A is pressed against the claw base 54B by a spring or the like, and the claw 54A is opened and closed against the claw base 54B by the action of a cam or the like.
- the front end portion of the recording medium P sent from the storage unit (not shown) in which the recording medium P is housed is held by the gripper 54 as shown in FIG. Further, in the transport unit 15, the chain 52 orbits in the circumferential direction C while the gripper 54 holds the front end portion of the recording medium P, thereby moving the gripper 54 to transport the recording medium P and recording with the gripper 54. While holding the medium P, it is passed through the nip region 28A together with the gripper 54. Further, in the transport unit 15, after passing the recording medium P through the nip region 28A, the recording medium P is conveyed to the fixing device 16 while being held by the gripper 54, and is passed through the nip region 69A together with the gripper 54.
- the nip region 69A referred to here is an example of a fixing region and a heating region in the present invention.
- the fixing region in the present invention may include at least one region of the nip region 69A on the upstream side in the transport direction and the region on the downstream side in the transport direction.
- the fixing region is not limited to the nip region 69A, and may be a heating region facing the non-contact heating portion 70 described later. Since the recording medium P is conveyed from the transfer region to the fixed region without being transferred in this way, the unfixed image (toner image transferred to the recording medium P) is disturbed between the transfer region and the fixed region. It can be suppressed.
- the transport member located between the transfer region and the fixing region transports the recording medium P to the gripper 54.
- the transport member may come into contact with the recording medium on which the unfixed image is transferred, and the unfixed image may be disturbed.
- a suction transfer belt or the like a large space may be taken.
- the recording medium P After the recording medium P has passed through the nip region 28A, it is possible to prevent the recording medium P from being conveyed in a state of being electrostatically adsorbed on the transfer belt 24. Further, the tip of the recording medium P is less likely to touch the transfer nip portion, and the occurrence of jam when entering the nip region 28A is suppressed.
- the suction roll 59 is in contact with the transfer cylinder 28 on the upstream side in the transport direction with respect to the nip region 28A.
- the suction roll 59 presses the recording medium P against the transfer cylinder 28 and charges the recording medium P by supplying power from the power source 57. As a result, the recording medium P is electrostatically attracted to the outer peripheral surface of the transfer cylinder 28.
- no sprocket is provided between the time of passing through the nip area 28A and the time of reaching the nip area 69A.
- the image forming apparatus 10 heats the recording medium P in a non-contact state with the recording medium P between the secondary transfer body 27 and the fixing device 16 in the transport direction of the recording medium P. It has a non-contact heating unit 70.
- the non-contact heating unit 70 includes a reflector 72 and a plurality of infrared heaters 74 (hereinafter, referred to as “heaters 74”).
- the reflector 72 is formed by using an aluminum plate, and has a shallow box shape in which the recording medium P side (lower side in FIG. 1) to be conveyed is open. In the present embodiment, the reflector 72 covers the conveyed recording medium P in the device depth direction (the depth direction of the paper surface in FIG. 1) when viewed from above.
- a plurality of heaters 74 are infrared heaters having a columnar outer shape, are housed inside the reflector 72, and are arranged so as to extend in the depth direction of the device.
- the heater 74 covers the recorded recording medium P to be conveyed in the depth direction of the device when viewed from above.
- the plurality of heaters 74 are arranged in the device width direction.
- the heater 74 is an example of a non-contact heating unit.
- the heater 74 is a columnar infrared heater having a length in the front-rear direction of the device.
- a plurality (for example, 40) of the heaters 74 are arranged inside the reflector 72 along the width direction of the device.
- the heater 74 includes a carbon filament (not shown) and a cylindrical quartz tube (not shown) in which the carbon filament is housed.
- a black infrared radiation film is formed on the surface of the quartz tube.
- the infrared heater 74 in this embodiment has a wavelength peak of the infrared radiation wavelength set to 2 [ ⁇ m] or more and 5 [ ⁇ m] or less, which is a so-called far infrared region.
- the surface temperature of the heater 74 of the heating unit 102 is a predetermined temperature of 300 [° C.] or more and 1175 [° C.] or less.
- the length of the reflector 72 in the device width direction is 1 [m]
- the heaters 74 that efficiently radiate far infrared rays are arranged in the device width direction at a density of 20 or more and 100 or less. A good heating distribution is obtained.
- the number is less than 20 per 1 [m] in the device width direction.
- the number of heaters 74 it is necessary to increase the voltage applied to the carbon filament in order to increase the output amount of each heater 74, but the temperature of the black infrared radiation film rises and it is closer than far infrared rays. Melting of toner by heat conduction from the surrounding air heated by the infrared light component becomes dominant. As a result, uneven melting occurs between the vicinity of the heater 74 and the heater 74.
- the carbon filament can be dominated by far-infrared radiation, so that the carbon filament can be radiated from the radiation source against toner melting.
- far infrared rays having a small distance dependence can be used more effectively, so that melting unevenness between the heaters 74 is reduced.
- the fixing device 16 is heated by the heat of the toner, making it difficult to control the temperature. Therefore, it is preferable to use 100 or less heaters 74 per 1 [m] in the width direction of the device.
- the number of heaters 74 may be 30 or more and 50 or less per 1 [m] in the device width direction. preferable.
- the image forming apparatus 10 is viewed from the side of the chain 52 (specifically, in the circumferential direction C of the chain 52, the downstream side of the sprocket 29 and the upstream side of the sprocket 19).
- the blower unit 76 may be provided at a position facing the heater 74 with the portion) in between.
- the blower unit 76 includes a ventilation hole 80 facing the back surface of the recording medium P and a fan 78.
- the blower unit 76 is an example of a blower unit.
- the front end portion of the recording medium P sent from the accommodating portion (not shown) in which the recording medium P is accommodated is held by the gripper 54 as shown in FIG. ..
- the chain 52 orbits in the circumferential direction C with the gripper 54 holding the front end portion of the recording medium P, thereby moving the gripper 54 to convey the recording medium P and carrying the gripper.
- the nip region 28A is passed together with the gripper 54.
- the recording medium P is electrostatically attracted to the transfer cylinder 28 by the suction roll 59 on the upstream side in the transport direction with respect to the nip region 28A.
- the recording medium P passes through the nip region 28A, the recording medium P is electrostatically attracted to the transfer belt 24 and the transfer cylinder 28 by the discharge of the discharge wire 60A in the charger 60. Due to the discharge of the discharge wire 60A in the charger 60, the toner image superimposed on the transfer belt 24 is transferred from the transfer belt 24 to the recording medium P in the nip region 28A which is the secondary transfer position T2.
- the recording medium P that has passed through the nip area 28A is conveyed to the fixing device 16 while being held by the gripper 54, and passes through the nip area 69A together with the gripper 54. By passing through the nip region 69A, the toner image is fixed on the recording medium P.
- the chain 52 is stretched between the pair of sprockets 29 of the image forming portion 14 and the pair of sprockets 19 of the fixing device 16, the recording medium held by the gripper 54 attached to the chain 52. P is conveyed from the image forming unit 14 to the fixing device 16 by the circulation of the chain 52. Therefore, it is possible to save space as compared with the configuration in which the image forming unit 14 and the fixing device 16 use separate chains.
- the chain 52 is wound around the sprocket 29 and the sprocket 19. For this reason, it is possible to save space as compared with a configuration in which the chain 52 is bridged between the sprocket 29 and the sprocket 19 and is wound around other sprockets arranged on both sides of the sprocket 29 and the sprocket 19 in between. It will be possible.
- the maximum width portion 52W is from the portion where the chain 52 is wound around the sprocket 29 to the portion where the chain 52 is wound around the sprocket 19. For this reason, it is possible to save space as compared with a configuration in which the maximum width portion 52W of the chain 52 corresponds to a portion wound around other sprockets arranged on both sides of the sprocket 29 and the sprocket 19 in between. It will be possible.
- the gripper 54 conveys the recording medium P by orbiting the chain 52 and passes through the nip region 28A and the nip region 69A. Therefore, by connecting a plurality of impression cylinders and passing the recording medium P to the grippers of each impression cylinder, the recording medium P is conveyed from the image forming unit 14 to the fixing device 16 and passes through the nip area 28A and the nip area 69A. Since the heat of the heating roll 68 of the fixing device 16 is not transferred to the transfer cylinder 28 through the plurality of impression cylinders, the heat is less likely to affect the transfer cylinder 28.
- the outer diameter R1 of the pair of sprockets 29 is smaller than the outer diameter of the transfer cylinder 28, as shown in FIG.
- the peripheral speed of the sprockets 29 becomes larger than the peripheral speed of the transfer cylinder 28.
- the transport speed of the recording medium P held by the gripper 54 attached to the chain 52 wound around the sprocket 29 may be higher than the peripheral speed of the transfer cylinder 28.
- the recording medium P may be pulled and displaced toward the downstream side in the transport direction with respect to the transfer cylinder 28 and the transfer belt 24.
- the outer diameter of the pair of sprockets 29 is smaller than the outer diameter of the transfer cylinder 28, so that the outer diameter of the pair of sprockets 29 is equal to or larger than the outer diameter of the transfer cylinder 28.
- the recording medium P is prevented from being displaced toward the downstream side in the transport direction with respect to the transfer cylinder 28 and the transfer belt 24, as compared with the configuration having the size of.
- the transfer cylinder 28 has a base material 28E and a surface layer 28F that is wound around the outer circumference of the base material 28E and can be exchanged with respect to the base material 28E.
- the outer diameter R2 of the pair of sprockets 19 is smaller than the outer diameter of the pressure roll 69, as shown in FIG.
- the peripheral speed of the sprocket 19 becomes larger than the peripheral speed of the pressure roll 69.
- the transport speed of the recording medium P held by the gripper 54 attached to the chain 52 wound around the sprocket 19 may be higher than the peripheral speed of the pressure roll 69.
- the recording medium P may be pulled and displaced toward the downstream side in the transport direction with respect to the heating roll 68.
- the outer diameter R2 of the pair of sprockets 19 is smaller than the outer diameter of the pressure roll 69, the outer diameter R2 of the pair of sprockets 19 is equal to or larger than the outer diameter of the pressure roll 69.
- the recording medium P is prevented from being displaced downstream in the transport direction with respect to the heating roll 68, as compared with the configuration having a large diameter.
- the pressure roll 69 has a base material 69E and a surface layer 69F that is wound around the outer circumference of the base material 69E and can be exchanged with respect to the base material 69E.
- the non-contact heating unit 70 that heats the recording medium P in a non-contact state with the recording medium P is provided.
- the secondary transfer body 27 and the fixing device 16 do not have a non-contact heating unit 70 that heats the recording medium P in a non-contact state with the recording medium P.
- the image can be heated without contacting the recording medium P.
- an image may already be formed on the side of the recording medium P opposite to the side on which the image is transferred (hereinafter referred to as "back side").
- back side the transport portion that is in contact with the back surface of the recording medium P and is transported is heated by the heat received from the heater 74, and the image on the back surface of the recording medium P that is in contact with the transport member is distorted.
- the back surface of the recording medium P is conveyed so as not to contact in the region facing the heater 74, the image on the back surface of the recording medium P is suppressed from being disturbed.
- the blower unit 76 is provided at a position facing the heater 74 with the chain 52 sandwiched in the side view.
- the fan 78 blows air toward the back surface of the recording medium P so that the sheet surface of the recording medium P conveyed between the blower unit 76 and the heater 74 faces in the vertical direction.
- the posture is stable. That is, by controlling the force of the air blown out from the fan 78, the rear end of the conveyed recording medium P is suppressed from moving downward with respect to the front end of the recording medium P.
- the ventilation holes 80 do not face the surface of the recording medium P on which the image is transferred. Therefore, it is suppressed that the image transferred to the recording medium P is cooled.
- the blowing unit 76 is a back surface opposite to the front surface of the recording medium P, and the recording medium P is conveyed by the conveying unit 15 with the back surface in the image region where the unfixed image is formed on the front surface in a non-contact state.
- this is an example of a support portion that supports the paper, which is the recording medium P, so that the posture of the paper, which is the recording medium P, does not bend significantly while maintaining the non-contact state.
- the blower unit 76 is an example of a blower unit that blows air to the back surface of the recording medium P conveyed by the transfer unit 15.
- the recording medium P may be conveyed while maintaining the non-contact state only by the blower portion by using both the transport portion and the blower portion.
- the air blowing unit 76 blows air to the back surface of the recording medium P conveyed by the gripper 54, so that the recording medium P floats up.
- the back surface of the recording medium P is in a non-contact state.
- at least the back surface of the recording medium P in the image region is in a non-contact state.
- at least the back surface of the recording medium P in the image region is in a non-contact state with respect to the front surface of the blower unit 76. Therefore, the blower unit 76 has a function of maintaining the non-contact state so that the recording medium P is conveyed by the gripper 54 while the back surface of the recording medium P in the image region is in the non-contact state.
- the back surface of the recording medium P outside the image region is allowed to come into contact with the front surface of the blower unit 76. It is necessary to prevent the air blown from the blower port of the blower unit 76 from being directly supplied to the surface of the recording medium P.
- This is an image forming apparatus of the type in which the image forming apparatus 10 of this embodiment forms an image using dry toner, and is unfixed when air is supplied directly to the surface of the recording medium P from the air outlet. This is because there is a risk of disturbing the toner image.
- By supplying air only to the back surface of the recording medium P it is possible to suppress cooling of the toner transferred to the front surface of the recording medium P.
- the blower unit 76 extends upstream in the transport direction from the heating region.
- the blowing region set by the blowing unit 76 is set longer toward the upstream in the transport direction of the recording medium P than the heating region set by the non-contact heating unit described above. Therefore, before the tip of the recording medium P enters the heating region and before the rear end of the recording medium P passes through the transfer region, the blower unit 76 supports the posture of the recording medium P, and the posture of the recording medium P is changed. It is carried to the heating area in a stable state.
- the heating region is compared with the case where the recording medium P receives the air blown by the blower unit 76 after passing through the transfer region.
- the fluttering of the recording medium P before the recording medium P rushes into is easily suppressed.
- the blower unit 76 supports the recording medium P, so that the blower unit 76 can be said to be a medium support portion. Therefore, the recording medium P is likely to be supported by the blower unit 76 before the recording medium P enters the heating region.
- the blower unit 76 continues to support the recording medium P, so that uneven heating is less likely to occur. Further, it is possible to prevent the unfixed toner on the recording medium P from coming into contact with other members in the apparatus. Small fans may be provided at regular intervals in the transport direction as long as they contribute to the support of the recording medium P. In the present embodiment, it is more preferable that the blower unit 76 extends downstream from the heating region in the transport direction. As a result, the recording medium P is supported by the blower unit 76 until the rear end of the recording medium P passes through the heating region. As a result, the recording medium P can be supported by the blower unit 76 until the rear end of the recording medium P is completely removed.
- the back surface of the recording medium P in the image region is in a non-contact state
- a portion other than the image region is gripped by the gripper 54 before the rear end of the recording medium P enters the transfer region.
- a portion other than the image region such as the above may be gripped by the gripper 54.
- the surface of the image region is not in contact with other members in terms of suppressing image distortion.
- the so-called corotron is used as the charger 60, but the charging device 60 is not limited to this.
- a so-called scorotron having a grid may be used as the charger 60.
- the gripper 54 as an example of the holding portion holds the front end portion of the recording medium P, but the present invention is not limited to this.
- grippers 154, 155, and 156 that hold the side end portions of the recording medium P may be used.
- the grippers 154, 155, and 156 hold the recording medium P outside the region GR where the toner image of the recording medium P is transferred.
- the grippers 154, 155, and 156 pass through the nip region 28A in a side view.
- the chain 52 is shown in a simplified manner.
- FIG. 8 shows a state in which the recording medium P is conveyed between the sprocket 29 and the sprocket 19.
- the holding portion may be composed of only the gripper 154 that holds the front end side of the recording medium P.
- the front end side of the recording medium is a portion of the recording medium on the downstream side (front side) from the center in the transport direction.
- the holding portion does not necessarily have to hold the recording medium, and may be in the form of being adsorbed by air.
- the chain 52 is used as an example of the orbiting member, but the present invention is not limited to this.
- a timing belt may be used as an example of the orbiting member.
- the sprocket 29 is used as an example of the first rotating body, but the present invention is not limited to this.
- a timing pulley around which a timing belt is wound may be used.
- a timing pulley is used as an example of the first rotating body, a timing pulley is used instead of the sprocket 19 as an example of the second rotating body.
- timing pulleys are used instead of sprockets 46, 47 and 48.
- the charger 60 is used as an example of the facing portion, but the present invention is not limited to this.
- the facing portion comes into contact with the transfer belt 24 and presses the transfer cylinder 28, or is pressed by the transfer cylinder 28 and is pressed against the opposing rotating body (a pressing member such as a backup roll or a photoconductor). And the pressed member).
- the transfer cylinder may be fixed and a rotating body urged by a spring may push the transfer cylinder, or vice versa.
- the transfer device has a transfer belt 24 and a recording medium P between the transfer cylinder 28 and the backup roll 90.
- the toner image formed on the transfer belt 24 is secondarily transferred to the recording medium P by passing the toner image on the transfer belt 24.
- the transfer bias voltage applied between the transfer cylinder 28 and the backup roll 90 is composed of a DC component (DC component), and the transfer cylinder 28 is grounded to the ground potential.
- DC component DC component
- disturbance such as the pressing backup roll 90 colliding with the recess 28D as an example of the notch portion of the transfer cylinder 28 occurs, and the backup roll 90 and the transfer cylinder 28 rotate. May affect. Then, the speeds of the transfer belt 24 and the transfer cylinder 28 are affected, and the image registration is deteriorated.
- the recording medium P is easily conveyed following the surface of the transfer cylinder 28. Further, when the moment of inertia of the transfer cylinder 28 is large, the chain 52 is less likely to be vibrated. Further, even when the facing portion is not in contact with the transfer cylinder 28 such as a corotron, the transfer cylinder 28 is less susceptible to disturbance because there is no opposing rotating body. Further, in the nip region 28A, the surface layer 28F of the transfer cylinder 28 rotates while being pressed (elastically deformed) by the backup roll 90 via the transfer belt 24. As a result, the recording medium P and the transfer belt 24 come into close contact with each other.
- the transfer cylinder 28 is provided as an example of the transfer body, but a cylindrical rotating body that is not hollow may be provided.
- the heating roll 68 is used as an example of the heating unit, but the present invention is not limited to this.
- a heating belt in contact with the pressure roll 69 may be used as an example of the heating unit.
- the heater 74 is used as an example of the non-contact heating unit, but the present invention is not limited to this.
- a halogen lamp may be used as an example of the non-contact heating unit.
- the transfer cylinder 28 is rotationally driven to rotate the chain 52, but the present invention is not limited to this configuration.
- the pressurizing roll 69 may be rotationally driven to rotate the chain 52 with the transfer cylinder 28 as a driven rotation, or the transfer cylinder 28 and the pressurizing roll 69 may be synchronized with each other to orbit the chain 52. You may.
- the pressure roll 69 and the transfer cylinder 28 may be driven to rotate, and the other sprockets may be rotationally driven to rotate the chain 52.
- the chain 52 is wound around the sprockets 19, 29, 46, 47, 48, but the present invention is not limited to this configuration.
- the chain 52 may be wound only on the sprockets 19 and 29 without providing the sprockets 46, 47 and 48.
- the present invention is applied to the electrophotographic image forming apparatus 10, but the present invention is not limited to this configuration, and the present invention is applied to a known image forming apparatus other than the electrophotographic type. May be good.
- the present invention may be applied to an inkjet image forming apparatus.
- the image forming unit has an inkjet head as an example of a forming unit that ejects droplets onto the recording medium P supported by the rotating cylinder to form an image on the recording medium P
- the fixing unit has an inkjet head. It has a drying portion for drying the droplets discharged to the recording medium P.
- a form may be used in which droplets of each color are ejected toward the ink receptors held on the intermediate transfer belt to form an image, and the image-formed ink receptors are transferred to the recording medium P.
- a form such as powder coating may be used in which the recording medium is conveyed in a state where the recording medium is not impregnated with the coloring material.
- the recording medium is not limited to paper, and may be a medium such as a label that is difficult to soak (partially soaks) or does not soak into ink or coloring material.
- the present invention is not limited to the above-described embodiment, and various modifications, changes, and improvements can be made within a range that does not deviate from the gist thereof.
- the above-mentioned modified examples may be configured by combining a plurality of them as appropriate.
- This application applies to Japanese Patent Application No. 2019-171943 dated September 20, 2019, International Patent Application No. PCT / JP2020 / 022190 dated June 4, 2020, and Japanese Patent Application No. 12 dated August 12, 2020. Claim priority under 2020-136294.
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Abstract
Description
本実施形態に係る画像形成装置10の構成を説明する。図1は、本実施形態に係る画像形成装置10の構成を示す概略図である。
画像形成部14は、トナー画像(画像の一例)を記録媒体Pに形成する機能を有している。具体的には、画像形成部14は、トナー像形成部22と、転写装置17と、を有している。
図1に示されるトナー像形成部22は、色ごとにトナー像を形成するように複数備えられている。本実施形態では、イエロー(Y)、マゼンタ(M)、シアン(C)、ブラック(K)の計4色のトナー像形成部22が設けられている。図1に示す(Y)、(M)、(C)、(K)は、上記各色に対応する構成部分を示している。
転写装置17は、図1に示されるように、転写ベルト24と、一次転写ロール26と、二次転写体27と、帯電器60と、を備えている。図1に示される転写装置17は、トナー像形成部22で形成されたトナー像を記録媒体Pに転写する装置である。具体的には、転写装置17は、各色の感光体ドラム32のトナー像を、中間転写体としての転写ベルト24に重ねて一次転写し、該重ねられたトナー像を二次転写位置T2(すなわち、後述のニップ領域28A)で記録媒体Pに二次転写する。
図1に示される一次転写ロール26は、各色の感光体ドラム32のトナー像を、感光体ドラム32と一次転写ロール26との間の一次転写位置T1にて転写ベルト24に転写させるロールである。本実施形態では、一次転写ロール26と感光体ドラム32との間に一次転写電界が印加されることで、感光体ドラム32に形成されたトナー像が、一次転写位置T1にて転写ベルト24に転写される。
図1に示される転写ベルト24は、画像が外面に転写される環状の転写ベルトの一例である。具体的には、転写ベルト24は、各色の感光体ドラム32からトナー画像が外周面(外面の一例)に転写される。さらに具体的には、転写ベルト24は、以下のように構成されている。転写ベルト24は、図1に示されるように、環状である。さらに、転写ベルト24は、駆動ロール42D、巻掛ロール42E、42Fを含む複数のロール42に巻き掛けられて姿勢が決められている。転写ベルト24は、例えば、複数のロール42のうち、駆動ロール42Dが、駆動部(図示省略)によって回転駆動することで、予め定められた矢印A方向(以下、ベルト周回方向Aという)へ周回する。巻掛ロール42E、42Fの具体的な構成については、後述する。
二次転写体27は、転写部の一例である。二次転写体27は、具体的には、図2に示されるように、第1胴の一例としての転写胴28と、一対のスプロケット29と、を有している。転写胴28は、転写ベルトの外面とで記録媒体を挟んで画像を転写ベルトから記録媒体に転写する転写領域を有する転写胴の一例である。転写胴28は、具体的には、図3に示されるように、転写ベルト24の外周面とで記録媒体Pを挟むニップ領域28A(転写領域の一例)を有している。ニップ領域28Aは、記録媒体Pが挟まれる領域であるので挟み領域ともいえる。転写胴28は、記録媒体Pを転写ベルト24とで挟むので挟み部ともいえる。図3では、記録媒体Pを簡略化し、一部を示している。
帯電器60は、転写ベルトの内側で挟み部に対向する対向部の一例である。この帯電器60は、図3に示されるように、転写ベルト24の内側で転写胴28に対向するように配置されている。具体的には、帯電器60は、ニップ領域28Aにおける搬送部15の搬送方向の中央28Sを含む領域において、転写胴28に対向している。
図1及び図3に示される巻掛ロール42E、42Fは、転写ベルトの内側で転写ベルトが巻き掛けられた一対の巻掛ロールの一例である。巻掛ロールは必ずしも一対である必要はなく片方だけであってもよい。本実施形態においては、巻掛ロール42E、42Fが回転体で構成されているが、回転しない金属体の表面に不織布等が接着されているような摺動部材で巻掛ロールが構成されていてもよい。巻掛ロール42E、42Fは、帯電器60に対するベルト周回方向Aの上流側及び下流側に配置されている。
図1に示される定着装置16は、転写胴28によって記録媒体Pに転写されたトナー像を該記録媒体Pに定着する装置である。具体的には、定着装置16は、図1に示されるように、加熱部材としての加熱ロール68と、加圧部材としての加圧ロール69と、一対のスプロケット19と、を有している。図1では、スプロケット19を省略している。定着装置16では、加熱ロール68及び加圧ロール69によって、記録媒体Pを加熱及び加圧することで、記録媒体Pに形成されたトナー像を該記録媒体Pに定着する。定着装置16は、定着部の一例である。加圧ロール69は、第2胴の一例である。
図1~図3等に示される搬送部15は、記録媒体Pを画像形成部14から定着装置16まで搬送する機能を有している。具体的には、搬送部15は、記録媒体Pを搬送して図3に示される画像形成部14のニップ領域28A及び定着装置16のニップ領域69Aを通過させる機能を有している。さらに具体的には、搬送部15は、図1及び図2に示されるように、一対のスプロケット19と、一対のスプロケット29と、一対のスプロケット46、一対のスプロケット47、一対のスプロケット48、一対のチェーン52と、グリッパ54と、吸着ロール59と、を有している。一対のチェーン52は、周回部材の一例である。グリッパ54は、記録媒体を保持する保持部の一例である。図1では、スプロケット46、スプロケット47、スプロケット48、チェーン52及びグリッパ54を簡略化して示し、スプロケット19及びスプロケット29については省略している。図3では、チェーン52及びグリッパ54を簡略化して示している。
反射板72は、アルミニウム板を用いて形成されており、搬送される記録媒体P側(図1における下側)が開放された底浅の箱状である。本実施形態では、上方から見て、反射板72は、搬送される記録媒体Pを装置奥行方向(図1において紙面の奥行方向)で覆うようになっている。
ヒータ74は、外形が円柱状の赤外線ヒータであって、反射板72の内部に複数収容され、装置奥行方向に延びるように配置されている。本実施形態では、上方から見て、ヒータ74は、搬送される記録媒体Pを装置奥行方向で覆うようになっている。複数のヒータ74は、装置幅方向に並べられている。ヒータ74は、非接触加熱部の一例である。具体的には、ヒータ74は、装置前後方向に長さを有する円柱状の赤外線ヒータである。このヒータ74は、反射板72の内部に装置幅方向に沿って、複数(例えば、40本)並べられている。ヒータ74は、具体的には、図示しないカーボンフィラメントと、内部にカーボンフィラメントが収容された円筒状の図示しない石英管と、を備えて構成されている。上記石英管の表面には、黒色の赤外線放射膜が形成されている。このように、石英管の表面に黒色の赤外線放射膜が形成されていることで、例えば、白膜が形成されている場合と比して、ヒータは、赤外線を効率よく放射するようになっている。本実施形態において、黒色とは、無彩色点(x=0.333,y=0.333、Y=0)からの色度のズレが色差ΔEで100以内である色である。本実施例における赤外線ヒータ74は、赤外線の放射波長の波長ピークが、2〔μm〕以上5〔μm〕以下に設定されており、いわゆる遠赤外線の領域である。加熱部102のヒータ74の表面温度は、300〔℃〕以上1175〔℃〕以下の予め定められた温度である。本実施形態では反射板72の装置幅方向の長さが1〔m〕に対し、遠赤外線を効率よく放射するヒータ74を装置幅方向に20本以上100本以下の密度で並べることで、良好な加熱分布が得られている。
次に、本実施形態に係る作用を説明する。
また、転写胴28の半径が大きい場合、スプロケット29も相対的に大きくなるので、チェーン52のスプロケット29に巻き掛けられる量が増える。そのため、記録媒体Pが転写胴28の表面に倣って搬送されやすくなる。
また、転写胴28の慣性モーメントが大きい場合、チェーン52の振動を受けにくくなる。
また、対向部がコロトロン等のように転写胴28に非接触の場合も、対向する回転体がないため、転写胴28は外乱を受けにくい。
また、ニップ領域28Aにおいて、転写胴28の表層28Fは、転写ベルト24を介してバックアップロール90によって押圧されつつ(弾性変形させられつつ)回転する。それにより、記録媒体Pと転写ベルト24がより密着する。
転写胴28の慣性モーメントを大きくする方法としては、転写胴28の同軸上にフライホイールを配置する方法を用いてもよい。
また、本実施形態では、転写体の一例として転写胴28を有しているが、中空ではない円柱型の回転体を有していてもよい。
本願は、2019年9月20日付の日本国特許願第2019-171943号、2020年6月4日付の国際特許出願PCT/JP2020/022190号、及び2020年8月12日付の日本国特許願第2020-136294号に基づき優先権を主張する。
Claims (10)
- 記録媒体を支持する第1胴と、前記第1胴の軸方向端部に配置された第1回転体と、を有し、前記記録媒体に画像を形成する画像形成部と、
前記記録媒体を支持する第2胴と、前記第2胴の軸方向端部に配置された第2回転体と、を有し、前記記録媒体を加熱又は乾燥することにより前記画像を前記記録媒体に定着させる定着部と、
前記第1回転体と前記第2回転体に張架され、該第1回転体と該第2回転体の回転に伴って周回する周回部材と、前記周回部材に取り付けられ、前記記録媒体を保持する保持部と、を有し、前記周回部材の周回により前記記録媒体を前記画像形成部から前記定着部まで搬送する搬送部と、
を備える画像形成装置。 - 前記周回部材は、前記第1回転体と前記第2回転体に巻き掛けられている、請求項1に記載の画像形成装置。
- 前記画像形成装置の幅方向における前記搬送部の最大幅は、前記周回部材が前記第1回転体に巻き掛けられた部分から前記第2回転体に巻き掛けられた部分までの長さである、請求項2に記載の画像形成装置。
- 前記画像形成部は、画像が外面に転写される環状の転写ベルトをさらに有し、
前記第1胴は、前記転写ベルトの外面とで記録媒体を挟んで前記画像を前記転写ベルトから該記録媒体に転写する転写領域を有する転写胴であり、
前記定着部は、加熱部をさらに有し、
前記第2胴は、前記加熱部の外面とで記録媒体を挟んで画像を該記録媒体に定着させる定着領域を有する加圧ロールであり、
前記搬送部は、前記周回部材の周回により前記記録媒体を搬送して、前記転写領域及び前記定着領域を通過させる、請求項1~3のいずれか1項に記載の画像形成装置。 - 前記記録媒体の搬送方向において、前記画像形成部と前記定着部との間に設けられ、前記記録媒体に転写された画像を非接触で加熱する非接触加熱部をさらに備える、請求項4に記載の画像形成装置。
- 前記周回部材を挟んで前記非接触加熱部と対向し、前記搬送部によって搬送される前記記録媒体の前記画像が転写された面とは反対側の裏面に対して空気を送風する送風部をさらに備える、請求項5に記載の画像形成装置。
- 前記第1回転体の外径は、前記転写胴の外径よりも小さい、請求項4~6のいずれか1項に記載の画像形成装置。
- 前記転写胴は、基材と、前記基材の外周に巻かれ、前記基材に対して交換可能な表層と、を有する、請求項4~6のいずれか1項に記載の画像形成装置。
- 前記第2回転体の外径は、前記加圧ロールの外径よりも小さい、請求項4~8のいずれか1項に記載の画像形成装置。
- 前記加圧ロールは、基材と、前記基材の外周に巻かれ、前記基材に対して交換可能な表層と、を有する、請求項4~9のいずれか1項に記載の画像形成装置。
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CN202080053979.2A CN114174931A (zh) | 2019-09-20 | 2020-09-14 | 图像形成装置 |
EP20866291.6A EP3974358A4 (en) | 2019-09-20 | 2020-09-14 | Image-forming device |
AU2020348065A AU2020348065A1 (en) | 2019-09-20 | 2020-09-14 | Image-forming device |
US17/559,402 US20220113659A1 (en) | 2019-09-20 | 2021-12-22 | Image forming apparatus |
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JP2019-171943 | 2019-09-20 | ||
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PCT/JP2020/022190 WO2021053894A1 (ja) | 2019-09-20 | 2020-06-04 | 画像形成装置 |
JP2020-136294 | 2020-08-12 | ||
JP2020136294A JP2021050096A (ja) | 2019-09-20 | 2020-08-12 | 画像形成装置 |
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PCT/JP2020/034778 WO2021054292A1 (ja) | 2019-09-20 | 2020-09-14 | 画像形成装置 |
Country Status (5)
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US (1) | US20220113659A1 (ja) |
EP (1) | EP3974358A4 (ja) |
CN (1) | CN114174931A (ja) |
AU (1) | AU2020348065A1 (ja) |
WO (1) | WO2021054292A1 (ja) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11550241B1 (en) | 2021-08-25 | 2023-01-10 | Fujifilm Business Innovation Corp. | Image forming apparatus |
EP4141567A1 (en) * | 2021-08-25 | 2023-03-01 | FUJIFILM Business Innovation Corp. | Image forming apparatus |
EP4141561A1 (en) * | 2021-08-25 | 2023-03-01 | FUJIFILM Business Innovation Corp. | Image forming apparatus |
EP4141562A1 (en) * | 2021-08-25 | 2023-03-01 | FUJIFILM Business Innovation Corp. | Image forming apparatus |
US20230068278A1 (en) * | 2021-08-25 | 2023-03-02 | Fujifilm Business Innovation Corp. | Transfer device and image forming apparatus |
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- 2020-09-14 EP EP20866291.6A patent/EP3974358A4/en not_active Withdrawn
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Cited By (8)
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US11550241B1 (en) | 2021-08-25 | 2023-01-10 | Fujifilm Business Innovation Corp. | Image forming apparatus |
EP4141548A1 (en) * | 2021-08-25 | 2023-03-01 | FUJIFILM Business Innovation Corp. | Image forming apparatus |
EP4141567A1 (en) * | 2021-08-25 | 2023-03-01 | FUJIFILM Business Innovation Corp. | Image forming apparatus |
EP4141561A1 (en) * | 2021-08-25 | 2023-03-01 | FUJIFILM Business Innovation Corp. | Image forming apparatus |
EP4141562A1 (en) * | 2021-08-25 | 2023-03-01 | FUJIFILM Business Innovation Corp. | Image forming apparatus |
US20230068278A1 (en) * | 2021-08-25 | 2023-03-02 | Fujifilm Business Innovation Corp. | Transfer device and image forming apparatus |
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Also Published As
Publication number | Publication date |
---|---|
EP3974358A4 (en) | 2023-06-28 |
AU2020348065A1 (en) | 2022-03-03 |
CN114174931A (zh) | 2022-03-11 |
EP3974358A1 (en) | 2022-03-30 |
US20220113659A1 (en) | 2022-04-14 |
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