WO2020175016A1 - 画像形成装置 - Google Patents
画像形成装置 Download PDFInfo
- Publication number
- WO2020175016A1 WO2020175016A1 PCT/JP2020/003830 JP2020003830W WO2020175016A1 WO 2020175016 A1 WO2020175016 A1 WO 2020175016A1 JP 2020003830 W JP2020003830 W JP 2020003830W WO 2020175016 A1 WO2020175016 A1 WO 2020175016A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- recording medium
- transfer
- image forming
- transfer belt
- forming apparatus
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
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
- G03G15/20—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat
- G03G15/2003—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat
- G03G15/2014—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat using contact heat
- G03G15/2053—Structural details of heat elements, e.g. structure of roller or belt, eddy current, induction heating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H29/00—Delivering or advancing articles from machines; Advancing articles to or into piles
- B65H29/003—Delivering or advancing articles from machines; Advancing articles to or into piles by grippers
- B65H29/005—Delivering or advancing articles from machines; Advancing articles to or into piles by grippers by chains or bands having mechanical grippers engaging the side edges of articles, e.g. newspaper conveyors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H29/00—Delivering or advancing articles from machines; Advancing articles to or into piles
- B65H29/02—Delivering or advancing articles from machines; Advancing articles to or into piles by mechanical grippers engaging the leading edge only of the articles
- B65H29/04—Delivering or advancing articles from machines; Advancing articles to or into piles by mechanical grippers engaging the leading edge only of the articles the grippers being carried by endless chains or bands
- B65H29/042—Intermediate conveyors, e.g. transferring devices
- B65H29/044—Intermediate conveyors, e.g. transferring devices conveying through a machine
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H5/00—Feeding articles separated from piles; Feeding articles to machines
- B65H5/08—Feeding articles separated from piles; Feeding articles to machines by grippers, e.g. suction grippers
-
- 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
-
- 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
- G03G15/20—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2801/00—Application field
- B65H2801/03—Image reproduction devices
- B65H2801/06—Office-type machines, e.g. photocopiers
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 conveying drum grips the leading end of the sheet to convey the sheet.
- Patent Document 1 Japanese Unexamined Patent Publication No. 20 1 2-9 6 8 6 3
- An object of the present invention is to save space, as compared with a configuration in which the rotating body is provided as a member separate from the transfer section.
- a recording medium is sandwiched between an annular transfer belt on which an image is transferred to an outer surface and an outer surface of the transfer belt, and the image is transferred from the transfer belt to the recording medium.
- a transfer cylinder having a transfer area, a pair of first rotating bodies arranged on both axial ends of the transfer cylinder, and a transfer section having: A pair of revolving members that revolve by the rotation of the rotating body of 1, and a retaining member that is attached to the revolving member, holds the recording medium, conveys the recording medium by revolving the revolving member, and passes through the transfer area. And a section.
- the outer diameter of the first rotating body is smaller than the outer diameter of the transfer cylinder. ⁇ 02020/175016 2 (:171?2020/003830
- the transfer cylinder includes a base material, and a surface layer wound around the base material and replaceable with respect to the base material.
- a fourth aspect is that a heating section and a pressurizing port having a fixing region for fixing an image on the recording medium with an outer surface of the heating section sandwiching the recording medium, and the pressurizing port.
- a second rotating body disposed on both end sides in the axial direction is further provided, and the fixing member having the rotating body is wound around the second rotating body, and is rotated by the rotation of the second rotating body. Then, the holding unit conveys the recording medium by the circulation of the circulation member and passes through the fixing area.
- an outer diameter of the second rotating body is smaller than an outer diameter of the pressurizing port.
- the pressurizing port has a base material, and a surface layer wound around the outer periphery of the base material and replaceable with respect to the base material.
- a seventh aspect is provided with a non-contact heating means which is provided between the transfer section and the fixing section in the recording medium conveyance direction and which heats the image transferred onto the recording medium in a non-contact manner.
- An eighth aspect is provided with a blower section that faces the non-contact heating means between the pair of circulating members and blows air to the back surface of the recording medium conveyed by the holding section. ..
- space saving can be achieved as compared with the configuration in which the first rotating body is provided as a member separate from the transfer section.
- the recording medium is transferred to the transfer cylinder and the transfer belt in the transfer area. It is possible to suppress shifting to the downstream side in the transport direction with respect to the rule.
- the second rotating body is provided as a member separate from the fixing unit. ⁇ 02020/175016 3 (:171?2020/003830
- the recording medium is heated by the heating port in the fixing region.
- the shift to the downstream side in the transport direction is suppressed.
- the image on the back surface of the recording medium is disturbed as compared with the case where the heating means for heating the image transferred to the recording medium has a contact portion that contacts the back surface of the recording medium. Suppression is suppressed.
- FIG. 1 is a schematic view showing an image forming apparatus according to the present embodiment.
- FIG. 2 is an enlarged perspective view showing a secondary transfer portion of the image forming apparatus according to the present exemplary embodiment.
- FIG. 3 is an enlarged side view showing a secondary transfer portion of the image forming apparatus according to the present exemplary embodiment.
- FIG. 4 is a side view showing the secondary transfer member according to the present embodiment.
- FIG. 5 is a perspective view showing a gripper according to the present embodiment.
- FIG. 6 is an enlarged view showing a secondary transfer portion of an image forming apparatus according to a comparative example in an enlarged manner.
- FIG. 7 is an enlarged view showing a secondary transfer portion of an image forming apparatus according to a modification in an enlarged manner.
- FIG. 8 is an enlarged view showing a secondary transfer portion of an image forming apparatus according to a modification in an enlarged manner.
- FIG. 9 is an enlarged view showing a secondary transfer portion of an image forming apparatus according to a modification in an enlarged manner. ⁇ 02020/175016 4 (: 17 2020/003830
- FIG. 10 is an enlarged view showing a secondary transfer portion of an image forming apparatus according to a modification in an enlarged manner.
- FIG. 11 is an enlarged view showing a secondary transfer portion of an image forming apparatus according to a modification in an enlarged manner.
- FIG. 12 is an enlarged view showing a secondary transfer portion of an image forming apparatus according to a modification in an enlarged manner.
- FIG. 13 is a schematic diagram showing a transport section according to a modified example.
- FIG. 14 is an enlarged view showing a secondary transfer portion of an image forming apparatus according to a modification in an enlarged manner.
- FIG. 15 is a schematic diagram showing a transport section according to a modified example.
- FIG. 16 is a schematic view showing a carrying section according to a modified example.
- FIG. 17 is a schematic view showing a carrying section according to a modified example.
- FIG. 18 is a perspective view showing a gripper according to a modified example.
- FIG. 19 is a schematic view showing a fixing device according to a modified example.
- FIG. 20 is a schematic diagram showing a fixing device according to a modification.
- FIG. 1 is a schematic diagram showing the configuration of the 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.
- the image forming apparatus 10 includes an image forming unit 14, a conveying unit 15 and a fixing device 16. The respective parts of the image forming apparatus 10 (the image forming section 14, the transport section 15 and the fixing device 16) will be described below.
- the image forming unit 14 has a function of forming a toner image (an example of an image) on a recording medium. Specifically, the image forming unit 14 has a toner image forming unit 22 and a transfer device 17.
- 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 total of four toner image forming portions 22 of cyan, cyan ( ⁇ ), and black ( ⁇ ) are provided.
- the (), (1 ⁇ /o, (o), and ( ⁇ ) shown in Fig. 1 indicate the components corresponding to the above colors.
- the toner image forming unit 22 of each color is configured in the same manner except for the toner used, so that As a representative of the toner image forming unit 22, in FIG. 1, the respective parts of the toner image forming unit 2 2 (needle) are denoted by reference numerals.
- the toner image forming unit 22 of each color specifically has a photoconductor drum 3 2 (photoconductor) that rotates in one direction (for example, the counterclockwise direction in FIG. 1). Further, each color toner image forming unit 22 has 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. Further, the developing device 38 develops the electrostatic latent image formed on the photosensitive drum 32 by the exposing device 36 to form a toner image. Then, the removing device 40 removes the toner remaining on the photoconductor drum 32 after the transfer of the toner image to the transfer belt 24 described later.
- the transfer device 17 shown in FIG. 1 is a device that transfers the toner image formed by the toner image forming unit 22 onto a recording medium. Specifically, the transfer device 17 performs a primary transfer by superimposing the toner images of the photosensitive drums 32 of the respective colors on a transfer belt 24 serving as an intermediate transfer member, and then secondary transfer the superimposed toner images. Secondary transfer is performed on the recording medium at the transfer position 2 (nip area 28 described later). More specifically, as shown in FIG. 1, the transfer device 17 includes a transfer belt 24, a primary transfer hole 26, a secondary transfer member 27, a charger 60, and Equipped with.
- the primary transfer port 26 shown in Fig. 1 transfers the toner image of each color photosensitive drum 32 to the primary transfer position 1 between the photosensitive drum 3 2 and the primary transfer port 26.
- This is a transfer belt for transfer to the transfer belt 24.
- the toner image formed on the photosensitive drum 32 is transferred to the primary transfer position register. Transferred to transfer belt 2 4 at 1.
- the transfer belt 24 shown in Fig. 1 is an example of an annular transfer belt on which an image is transferred to the outer surface.
- the toner image is transferred from the photosensitive 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 has an annular shape as shown in Fig. 1. Further, the transfer belt 24 has a posture determined by being wound around a plurality of rollers 42 including a driving hole 420, a winding hole 42, and 42.
- the transfer belt 24 is, for example, a plurality of ports 42, and a driving port 420 is rotationally driven by a drive unit (not shown), so that a predetermined arrow direction ( In the following, it will be circulated in the belt circulation direction 8).
- a predetermined arrow direction In the following, it will be circulated in the belt circulation direction 8).
- the specific structure of Makukakeru 42 and 4 2 will be described later.
- the secondary transfer body 27 is an example of a transfer unit.
- the secondary transfer member 27 is specifically ⁇ 02020/175016 7 (:171?2020/003830
- the transfer cylinder 28 is an example of a transfer cylinder having a transfer region for sandwiching a recording medium with the outer surface of the transfer belt and transferring an image from the transfer belt to the recording medium.
- the transfer cylinder 28 has a nip area 28 (an example of a transfer area) that sandwiches the recording medium with the outer peripheral surface of the transfer belt 24.
- the nip area 28 is an area in which the recording medium is sandwiched, and thus can be referred to as a sandwiched area.
- the transfer cylinder 28 is also a nipping part because it sandwiches the recording medium with the transfer belt 24.
- the recording medium is simplified and a part thereof is shown.
- the nip region 28 is formed by winding the transfer belt 24 around the transfer cylinder 28.
- the nip area 28 can be said to be a contact area where the transfer belt 24 and the transfer cylinder 28 come into contact with each other.
- the nip area 288 is the secondary transfer position 2 where the toner image is transferred from the transfer belt 24 to the recording medium. Further, the transfer cylinder 28 conveys the recording medium with the transfer belt 24 sandwiched in the nip area 28.
- _ pair of sprocket DOO 2 9 is an _ example of the rotary member, a _ of the first rotating body.
- the pair of sprockets 29 are arranged on both axial ends of the transfer cylinder 28.
- 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 are configured to rotate integrally with the transfer cylinder 28.
- the secondary transfer body 27 is rotationally driven by a drive unit (not shown).
- the outer diameter of the pair of sprockets 29 is smaller than the outer diameter of the transfer cylinder 28, as shown in FIG.
- the outer diameter of the sprocket 29 is the outer diameter including the tooth 289 (that is, the diameter of the tip of the tooth).
- the transfer cylinder 28 has a base material 28 and a surface layer 28 which is wound around the outer circumference of the base material 28 and is replaceable with respect to the base material 28.
- a metal material such as stainless steel is used.
- the surface layer 28 urethane rubber, ethylene ⁇ propylene rubber (Mitsuru! ⁇ /1), silicone rubber, fluororubber ⁇ 02020/175016 8 ((171?2020/003830
- the surface layer 28 is detachably fixed to the base material 28. Therefore, the surface layer 28 can be removed from the base material 28 and the unused surface layer 28 can be attached.
- two recesses 280 for accommodating a gripper 54 and a mounting member 55 of the transport unit 15 to be described later are formed.
- the number of recesses 280 may be one, or may be three or more.
- the charger 60 is an example of a facing 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 283 of the transport unit 15 in the transport direction in the nip region 28.
- the charger 60 is a charger (so-called corotron type charger) that transfers the toner image of the transfer belt 24 by corona discharge.
- the charger 60 has a discharge wire 60 and a case 62 (housing).
- the discharge wire 60 has a linear shape having a length along the axial direction of the transfer cylinder 28.
- the discharge wire 608 is not in contact with the inner surface of the transfer belt 24. That is, the discharge wire 60 has a gap between it and the inner surface of the transfer belt 24.
- the 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 62 on the transfer cylinder 28 side (that is, the lower side).
- the case 62 includes a first wall 628 arranged on the side opposite to the transfer cylinder 28 with respect to the discharge wire 60, and a belt circumferential direction with respect to the discharge wire 60. And a pair of second walls 62 arranged on the upstream side and the downstream side. Further, the case 62 has third walls (not shown) arranged at both ends in the length direction of the discharge wire 60. ⁇ 02020/175016 9 ⁇ (: 17 2020/003830
- the case 62 is not in contact with the inner surface of the transfer belt 24.
- the case 62 has a gap between it and the inner surface of the transfer belt 24.
- the case 62 may have openings in a third wall (not shown) arranged at both ends in the length direction of the discharge wire 60, and at least the transfer cylinder 28 side. Any structure may be used as long as it has an opening 620 on the lower side (that is, on the lower side).
- a recording medium is electrostatically adsorbed on the transfer belt 24 and the transfer drum 28 by applying a voltage to the discharge wire 60 and discharging.
- the transfer belt 24 is charged by the discharge of the discharge wire 60, and the toner image superimposed on the transfer belt 24 is transferred to the nip area 28 (secondary transfer position). In 2), transfer from the transfer belt 24 to the recording medium.
- case holes 42 and 42 which are an example of a pair of case holes around which the transfer belt is wound inside the transfer belt.
- the winding holes 42 and 42 are arranged on the upstream side and the downstream side in the belt winding direction 8 with respect to the charger 60.
- the wall sockets 4 2 and 4 2 are the wall sockets 4 2 and 4 2 as seen in the axial direction of the wall sockets 4 2 and 4 2. , 4 2 are arranged so that the common tangent line passes over the transfer cylinder 2 8.
- the common external tangent line 8 is a tangent line on the same side of the tangent line (that is, the common tangent line) that is in contact with both the fold lines 4 2 and 4 2. 4 2
- the common external tangent line X is a tangent line that is in contact with the winding belt 42, 42 at which the transfer belt 24 is wound.
- the common external tangent wire 8 according to the present embodiment is a tangent wire that is in contact with the charging holes 42 and 42 on the transfer cylinder 28 side with respect to the charger 60.
- both of the rack holes 42 and the winding portions 4 3 and 4 3 wound around the transfer belt 2 4 are separated from the transfer cylinder 28.
- Hanging part 4 3 days is a recording medium for the hanging part 4 3? It is a winding portion on the upstream side in the transport direction of.
- the transport unit 15 shown in FIGS. 1 to 3 and the like has a function of transporting a recording medium. Specifically, the transport unit 15 has a function of transporting the recording medium and passing it through the nip region 288 (see FIG. 3). More specifically, as shown in FIGS. 1 and 2, the transport unit 15 includes a pair of sprockets 19, a pair of chains 52, a gripper 54, and a suction port 59. , have.
- the pair of chains 52 is an example of a circulating member.
- the gripper 54 is an example of a holding unit that holds a recording medium.
- the sprocket 19, the chain 52, and the gripper 54 are shown in a simplified manner. Further, in FIG. 3, the chain 52 and the gripper 54 are shown in a simplified manner.
- the pair of sprockets 19 are located in front of and behind the fixing device 16 side (left side in FIG. 1) of the pair of sprockets 29 of the secondary transfer body 27. It is arranged at intervals in the direction.
- the pair of sprockets 19 are coaxially and integrally rotatably supported by an apparatus body (not shown) of the image forming apparatus 10.
- the pair of chains 52 are formed in an annular shape as shown in FIG.
- the pair of chains 52 are arranged at intervals in the front-rear direction of the device (the mouth direction in FIG. 2).
- the pair of chains 52 are wound around the pair of sprockets 29 of the secondary transfer body 27 and the pair of sprockets 19 (see FIG. 1).
- the transfer cylinder 28 having the pair of sprockets 29 is rotated, the chain 52 is made to orbit in the orbiting direction ⁇ (direction of arrow ⁇ in FIG. 1).
- the chain 52 is wound so as to straddle at least a region facing the charger 60 in the nip region 288 in the circumferential direction ⁇ .
- the chain 52 has a ⁇ 02020/175016 11 ⁇ (: 171?2020/003830
- the chain 52 is wound around the sprocket 29 at a winding angle of 180 degrees or more. Therefore, the recording medium is easily transported following the surface of the transfer cylinder 28.
- the winding angle is preferably 90 degrees or more so that the recording medium can be easily transported following the surface of the transfer cylinder 28.
- the winding angle between the start of winding the chain 52 and the arrival at the secondary transfer position D in the circumferential direction ⁇ is 90° or more. For this reason, the recording medium easily follows the surface of the transfer cylinder 28 until it reaches the secondary transfer position 2.
- the chain 52 advances between the transfer belt 24 and the transfer cylinder 28 on the downstream side in the transport direction with respect to the nip region 28 in a side view.
- the chain 52 has a gap with respect to the hanging portion 4 3 in a side view, and on the side opposite to the hanging portion 4 3 with respect to the chain 52, the chain 52 is attached to the transfer cylinder 28. In contrast, it has a gap.
- the pair of chains 52 have a mounting member 55 to which a gripper 54 is attached, which is stretched along the longitudinal direction of the device.
- a plurality of mounting members 55 are fixed to the pair of chains 52 at predetermined intervals along the circumferential direction of the chain 52 (circling direction ⁇ ).
- a plurality of grippers 54 are attached to the attachment member 5 5 at predetermined intervals along the front-rear direction of the apparatus.
- 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.
- the gripper 54 has a claw 54 and a claw base 54.
- the gripper 54 is configured to hold the recording medium by sandwiching the front end of the recording medium between the claw 548 and the claw base 54.
- the gripper 54 is an example of a holding unit that holds the recording medium in the thickness direction.
- the gripper 54 is a recording medium outside the image area of the recording medium. Hold the front end of the. recoding media?
- the image area of is the area on the recording medium to which the toner image is transferred.
- the claw 548 is pressed against the claw base 54 by a spring or the like, and the claw 548 is opened and closed with respect to the claw base 54 by the action of a cam or the like. ..
- the front end of the recording medium sent from the storage unit (not shown) in which the recording medium is stored is held by the gripper 54 as shown in FIG.
- the chain 52 rotates in the orbiting direction ⁇ while the gripper 54 holds the front end of the recording medium, thereby moving the gripper 54 and transporting the recording medium, and the gripper 5 4 moves. While holding the recording medium at 4, pass it through the nip area 288 together with the gripper 54. Further, in the transport section 15, the recording medium is transported to the fixing device 16 after passing through the nip area 288.
- the suction port 59 is in contact with the transfer drum 28 on the upstream side in the transport direction with respect to the nip region 28.
- the suction port 59 presses the recording medium against the transfer cylinder 28, and electrically charges the recording medium by the power supply from the power source 57. As a result, the recording medium is electrostatically attracted to the outer peripheral surface of the transfer cylinder 28.
- the fixing device 16 shown in FIG. 1 is a device that fixes the toner image transferred onto the recording medium by the transfer drum 28 onto the recording medium. More specifically, the fixing device 16 has a heating port 68 as a heating member and a pressing port 69 as a pressing member, as shown in FIG. ing. The fixing device 16 fixes the toner image formed on the recording medium by heating and pressing the recording medium with the heating port 68 and the pressure port 69.
- a recording medium As shown in FIG. 5, the front end of the recording medium sent from the storage section (not shown) in which the ⁇ 02020/175016 13 ⁇ (: 171?2020/003830
- the chain 52 rotates in the orbiting direction ⁇ to move the gripper 5 4 to convey the recording medium, and the gripper 5 4 moves the recording medium. Hold it and pass it with gripper 54 through nip area 288 (see Figure 3).
- the recording medium is electrostatically attracted to the transfer drum 28 by the suction port 59 on the upstream side in the transport direction with respect to the nip area 28.
- the recording wire is electrostatically adsorbed to the transfer belt 24 and the transfer cylinder 28 by the discharge of the discharge wire 60 in the charger 60. .. Also, due to the discharge of the discharge wire 60 in the charger 60, the toner image superimposed on the transfer belt 24 is transferred to the transfer belt 2 4 at the nip area 28 (secondary transfer position 2). To the recording medium.
- the recording medium is conveyed by rotating 2 around.
- the sprocket 29 is rotating at a constant speed, as the sprocket 29 and the sprocket 19 rotate, the teeth of the sprocket 2 9 and the teeth and the chains of the sprocket 19 are combined with each other.
- the speed of the chain 52 may fluctuate due to the change in the position of the scooping with 52.
- the speed fluctuation of the chain 52 may cause the speed fluctuation of the recording medium in the nip region 288. Recording medium in nip area 28? If the speed changes, the transfer failure of the toner image may occur.
- the nip region 2 88 is formed by winding the transfer belt 2 4 around the transfer drum 28. Therefore, as compared with the first comparative example, the nip region 28 which sandwiches the recording medium between the transfer belt 24 and the transfer drum 28 becomes wider in the belt circumferential direction 8. Therefore, the speed fluctuation of the recording medium in the nip area 28 is suppressed compared to the first comparative example. ⁇ 0 2020/175016 14 ⁇ (: 171? 2020 /003830
- the first comparative example can be said to have a configuration in which the common tangent line X 8 is displaced from the transfer cylinder 28.
- the rack holes 42, 42 are the wall holes 42, 42 in the axial direction.
- the common outer tangent line X of the hanging holes 42, 42 is arranged so as to pass over the transfer cylinder 28.
- the nip area 28 is wider in the belt circumferential direction 8 than in the first comparative example (see FIG. 6) in which the common circumscribed line 8 is displaced from the transfer cylinder 28. Therefore, as compared with the first comparative example, the speed fluctuation of the recording medium in the nip area 288 is suppressed, and the defective transfer of the toner image is suppressed.
- the recording medium is attached to the transfer drum 28 and the transfer belt 24 by being sandwiched between the transfer belt 24 and the transfer drum 28 in the nip region 288. And, for example, is the transfer belt 24 recording medium? Away from the recording medium? Is peeled from the transfer belt 24.
- the recording medium adheres to the transfer drum 28.
- the recording medium is less likely to be pulled in the direction away from the transfer cylinder 28 and peeled off from the transfer cylinder 28.
- the second comparative example in which the recording medium is conveyed only by the pair of conveying ports, can be said to be a configuration in which the recording medium is conveyed without being held.
- the gripper 5 4 is moved to convey the recording medium, and the gripper 5 4 holds the recording medium while holding the gripper 5 4 together with the nip region 2. Pass eight eight.
- the recording medium attached to the transfer drum 28 is easily pulled in the direction away from the transfer drum 28 and is easily peeled off from the transfer drum 28. Therefore, the peeling failure of peeling the recording medium on which the toner image is transferred from the transfer drum 28 is suppressed.
- the hanging portion 43 of the transfer belt 24 is separated from the transfer cylinder 28. For this reason, the recording medium is nipped as compared with the structure in which the winding part 43 of the transfer belt 24 contacts the transfer cylinder 28. ⁇ 02020/175016 15 ⁇ (: 171?2020/003830
- both the hanging portion 43 and the hanging portion 4 3 of the transfer belt 24 are separated from the transfer cylinder 28. Therefore, compared with the configuration in which one of the hanging portion 4 3 and the hanging portion 4 3 is in contact with the transfer drum 28, the load that sandwiches the recording medium between the transfer belt 24 and the transfer drum 28. (Nip load) is reduced.
- the pair of sprockets 29 are provided in the secondary transfer body 27. Therefore, space saving can be achieved as compared with a configuration in which the pair of sprockets 29 are provided as separate members from the secondary transfer body 27.
- a configuration provided as a separate member for example, a configuration in which the sprocket 29 is arranged at a position deviated from the axis of the transfer cylinder 28 can be mentioned.
- a configuration provided as a separate member a configuration in which the sprocket 29 is rotated by a drive different from that of the transfer cylinder 28 can be mentioned.
- the outer diameter of the pair of sprockets 29 is smaller than the outer diameter of the transfer cylinder 28, as shown in FIG.
- the circumferential speed of the sprockets 29 is higher than that of the transfer drum 28.
- the conveyance speed of the recording medium 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. is there.
- the recording medium 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 drum 28, the outer diameter of the pair of sprockets 29 is smaller. , Recording medium compared to the configuration that is larger than the outer diameter of the transfer cylinder 28? Of the transfer drum 28 and the transfer belt 24 to the downstream side in the transport direction is suppressed.
- the transfer cylinder 28 includes the base material 28 and the outer periphery of the base material 28. ⁇ 02020/175016 16 rolls (: 171?2020/003830) and has a replaceable surface layer 28 for the base material 28.
- the rolling portion 4 3 of the transfer belt 2 4 and the rolling portion 4 3 Both were separated from the transfer cylinder 28, but are not limited to this.
- the structure may be such that the hanging portion 43 is in contact with the transfer cylinder 28 and the hanging portion 43 is separated from the transfer cylinder 28.
- the nip region 2 88 is wider in the belt circumferential direction 8 as compared with the structure in which both the hanging portions 4 3 and 4 3 are separated from the transfer cylinder 28.
- the hanging portion 43 may be separated from the transfer drum 28 and the hanging portion 43 may be in contact with the transfer drum 28.
- the nip region 28 is wider in the belt circumferential direction 8 than in the configuration in which both the hanging portions 4 3 and 4 3 are separated from the transfer cylinder 28.
- it is easier to draw the recording medium into the nip area 2 8 as compared with the structure in which the hanging portion 4 3 of the hanging port 42 is in contact with the transfer cylinder 28.
- both the hanging portion 43 and the hanging portion 43 may be in contact with the transfer cylinder 28.
- the nip region 2 88 is wider in the belt circumferential direction 8 as compared with the configuration in which one of the hanging portions 4 3 and 4 3 is separated from the transfer cylinder 28.
- the charger 60 is opposed to the transfer cylinder 28 in a region including the center 283 of the transport unit 15 in the transport direction in the nip region 2888.
- the charger 60 is not limited to this.
- the facing portion 1700 may be the facing portion 1700 having the charger 1660 arranged on the upstream side of the center 2883 of the eighteenths.
- the charger 160 is configured similarly to the charger 60 previously described. ⁇ 02020/175016 17 ⁇ (:171?2020/003830
- the charger 160 is an example of the upstream facing portion.
- the recording medium As compared with the configuration including only the charger arranged in the range from the center 2 8 3 of the nip area 2 8 8 to the downstream side, the recording medium? The area of electrostatic attraction to the transfer belt 24 and the transfer cylinder 28 becomes wider.
- the facing portion 170 is arranged on the downstream side in the transport direction with respect to the charger 160, and a voltage larger than the voltage at the charger 160 is applied.
- the charger may be configured to include the charger 180.
- the optimum transfer voltage value for transferring the toner image onto the recording medium is the optimum electrostatic adsorption voltage value for electrostatically adhering the recording medium to the transfer belt 24 and the transfer cylinder 28. Greater than.
- the electrostatic attraction voltage value is applied to the charger 160, and the transfer voltage value is applied to the charger 180.
- the charger 180 is an example of the downstream facing portion.
- the recording medium is a transfer belt 24 and a transfer cylinder 28.
- the charging device 1600 has a main function of electrostatically adsorbing the toner onto the charging device 1860, and the charging device 1800 has a main function of transferring a toner image onto a recording medium.
- the charger 160 and the charger 180 are functionally separated.
- the chain 52 travels between the transfer belt 24 and the transfer cylinder 28 on the downstream side in the transport direction with respect to the nip region 28 in a side view.
- the chain 52 travels between the transfer belt 24 and the transfer cylinder 28 on the downstream side in the transport direction with respect to the nip region 28 in a side view.
- it is not limited to this.
- the chain 52 is configured to advance along the transfer belt 24 at the downstream side in the transport direction with respect to the nip region 28 in a side view. Good. Specifically, the chain 52 advances along the transfer belt 24 up to the hanging portion 43 on the downstream side in the transport direction with respect to the nip region 28 in a side view.
- the recording medium conveyed while being held by the gripper 54 is ⁇ 02020/175016 18 ((171?2020/003830
- the recording medium moves along the transfer belt 24 up to the hanging portion 43, and the recording medium is separated from the transfer cylinder 28 before the transfer belt 24.
- the configuration shown in FIG. 12 is a configuration in which the recording medium is separated from the transfer drum 28 before the transfer belt 24 on the downstream side in the transport direction with respect to the nip region 28. ..
- the recording medium is separated from the transfer drum 28 after the transfer belt 24 at the downstream side in the transport direction with respect to the nip region 28 (hereinafter, the main Compared with the third comparative example), the peeling discharge between the transfer belt 24 and the recording medium is suppressed. As a result, the toner scattering of the toner image transferred onto the recording medium is suppressed as compared with the third comparative example.
- the chain 52 has a transfer drum 2 8 at the downstream side in the conveyance direction with respect to the nip area 28 in a side view. It may be configured to proceed along. Specifically, the chain 52 is located along the transfer cylinder 28 at a position downstream of the nipping region 28 at least at the facing position 28 facing the hanging portion 43 in the side view. Is in progress.
- the recording medium conveyed while being held by the gripper 54 moves along the transfer cylinder 28 up to the hanging portion 43 on the downstream side in the conveying direction with respect to the nip area 28.
- the recording medium peels off the transfer cylinder 28 after the transfer belt 24.
- the configuration shown in FIG. 14 is a configuration in which the recording medium is peeled from the transfer drum 28 after the transfer belt 24 on the downstream side in the transport direction with respect to the nip region 28. ⁇ 02020/175016 19 ⁇ (: 17 2020/003830
- a sprocket 202 and a sprocket 204 are provided, and the recording medium is transferred on the downstream side in the transport direction with respect to the nip area 28.
- the recording medium is transferred after the transfer belt 24.
- the configuration may be such that it can be switched between a state where it is peeled off from the transfer cylinder 28 (a state shown in FIG. 14).
- the state shown in FIG. 12 and the state shown in FIG. Can be switched to.
- a type of recording medium that is effective in suppressing vibration for example, thick paper
- the state shown in Fig. 14 is used, and peeling discharge from the transfer belt 24 is prevented.
- the state can be switched to the state shown in Fig. 12.
- the fixing device 16 is provided downstream of the sprocket 19 in the transport direction of the recording medium, but the present invention is not limited to this.
- the fixing device 16 has a configuration including a heating port 68, a pressure port 69, and a pair of sprockets 19. It's okay.
- the fixing device 16 is an example of a fixing unit.
- the pair of sprockets 19 is an example of the second rotating body.
- the slots 19 are arranged at both ends of the pressurizing port 69 in the axial direction.
- the pressurizing port 69 is provided between the pair of sprockets 19.
- a pair of sprocket sheet 1 9 is arranged in pressure port Lumpur 6 9 coaxially of and is configured to rotate the pressure port _ le 6 9 and _ the body.
- the pressurizing port 69 is rotationally driven by a drive unit (not shown). Note that, in FIG. 19, of the pair of sprockets 19 the sprockets 19 arranged on one axial side of the pressurizing port 69 (on the side of the paper in FIG. 19) are shown. ing.
- the pressurizing port 69 there is formed one recess 690 for accommodating the gripper 54 and the mounting member 55 of the transport unit 15.
- a plurality of recesses 690 may be formed according to the arrangement interval of the grippers 54 along the winding direction ⁇ of the chain 52.
- the gripper 54 holds the recording medium while passing it through the nip region 288 together with the gripper 54. Further, in the transport unit 15, after passing the recording medium through the nip area 288, the gripper 54 holds the recording medium and the gripper 54 holds the nip area 698 (an example of the fixing area). ) Pass through.
- the space can be saved as compared with the configuration in which the sprocket 19 is provided as a member different from the fixing device 16.
- a sprocket is provided between the nip region 2 88 and the nip region 6 98 in the orbiting direction ⁇ of the chain 52.
- the chain 52 is wound so as to be linear between the secondary transfer and the fixing, and the recording medium on which the image is transferred is prevented from being bent and conveyed.
- the outer diameter of the pair of sprockets 19 is smaller than the outer diameter of the pressurizing port 69.
- the outer diameter of the sprocket 19 is the outer diameter including the tooth (that is, the tooth ⁇ 02020/175016 21 ((171?2020/003830
- the pressurizing port 69 is wound around the base material 69 and the outer circumference of the base material 69.
- the base material 69 a metal material such as stainless steel is used.
- an elastic material such as silicone rubber or an elastic material such as silicone rubber in which a release layer made of PFA or the like is sequentially laminated is used.
- the surface layer 69 is detachably fixed to the base material 69. Therefore, the surface layer 6 9 can be removed from the base material 6 9 and the unused surface layer 6 9 can be attached.
- a recording medium is inserted between the secondary transfer body 27 and the fixing device 16.
- a non-contact heating unit 70 for heating the recording medium in a non-contact state with the above may be used.
- the non-contact heating unit 70 includes a reflection plate 72 and a plurality of infrared heaters 7 4 (hereinafter, referred to as “heater 7 4 ”).
- the reflection plate 72 is formed of an aluminum plate, and has a shallow box shape with the side of the recording medium being conveyed (the lower side in FIG. 19) being open. In this embodiment, the reflection plate 72 covers the conveyed recording medium in the depth direction of the apparatus (the depth direction of the paper in FIG. 19) when viewed from above.
- the heater 74 is an infrared heater having a cylindrical outer shape, a plurality of heaters are housed inside the reflector 72, and are arranged so as to extend in the depth direction of the apparatus. In the present embodiment, when viewed from above, the heater 74 is configured so that the recording medium to be conveyed is in the depth direction of the apparatus. ⁇ 02020/175016 22 ⁇ (:171?2020/003830
- the plurality of heaters 74 are arranged in the device width direction (left and right direction in Fig. 19).
- the heater 74 is an example of non-contact heating means.
- the recording medium in the recording medium transporting direction, the recording medium is placed between the secondary transfer body 27 and the fixing device 16. Recording medium in non-contact state with? The image can be heated without contact with the recording medium as compared with the case where the non-contact heating unit 70 for heating the recording medium is not provided. Further, the gripper 5 4 conveys the recording medium from the nip area 2 88 to the nip area 6 9 8 while holding the recording medium, so that the recording medium is held from the nip area 2 8 8 to the nip area 69. The misregistration of the recording medium is suppressed compared to when it is not transported.
- the chain 52 (specifically, in the winding direction ⁇ of the chain 52, the downstream side of the sprocket 29 and the sprocket 1 ). It is also possible to have a blower unit 7 6 at a position facing the heater 7 4 with the upstream side portion 9) interposed therebetween.
- the blower unit 76 has a ventilation hole 80 facing the back side of the recording medium and a fan 78.
- the blower unit 76 is an example of the blower unit.
- the fan 78 blows air toward the back surface of the recording medium, so that the sheet surface of the recording medium conveyed between the blower unit 76 and the heater 74 moves in the vertical direction.
- the orientation of the recording medium is stable so that it faces you. In other words, by controlling the force of the air blown from the fan 78, the recording medium to be conveyed can be controlled. ⁇ 02020/175016 23 ⁇ (: 171?2020/003830
- the rear end of the body is restrained from moving downward with respect to the front end of the recording medium.
- the ventilation hole 80 does not face the surface of the recording medium on which the image is transferred. Therefore, it is possible to prevent the image transferred to the recording medium from being cooled.
- a so-called corotron is used as the charger 60, but the charger 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 unit holds the front end of the recording medium, but the present invention is not limited to this.
- grippers 1 5 4, 1 5 5, and 1 5 6 which hold the side end portions of the recording medium may be used.
- the grippers 154, 155, 156 are the areas where the toner image on the recording medium is transferred. Hold the recording medium outside the area.
- the grippers 154, 155, 156 pass through the nip area 288 in a side view.
- the chain 52 is shown in a simplified form.
- FIG. 18 shows a state in which the recording medium is conveyed between the sprocket 29 and the sprocket 19.
- the holding portion may be configured only by the gripper 154 that holds the front end side of the recording medium.
- the front end side of the recording medium is a part downstream (front side) from the center of the recording medium in the transport direction.
- the chain 52 is used as an example of the circulating member in the present embodiment, the present invention is not limited to this.
- a timing belt may be used as an example of the circulating member.
- the sprocket 29 is used as an example of the rotating body, but it is not limited to this.
- a timing pulley around which an evening belt is wound may be used.
- the timing pulley is also used for the sprocket 19.
- timing pulley When a timing pulley is used as an example of the rotating body, the timing pulley is used instead of the sprockets 202 and 204.
- the charger 60 is used as an example of the facing portion, but the present invention is not limited to this.
- an example of the facing portion may be a facing hole that contacts the transfer belt 24.
- the heating port 68 is used as an example of the heating unit, but the present invention is not limited to this.
- an example of the heating unit may be a heating belt that contacts the pressurizing port 69.
- the heater 74 is used as an example of the non-contact heating means, but the present invention is not limited to this.
- a halogen lamp may be used as an example of the non-contact heating means.
- the transfer belt 24 is located in the nip region 28.
- the outer surface of the transfer belt 24 may be in point contact with the transfer cylinder 28 when viewed in the width direction of the transfer belt 24.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Electrostatic Charge, Transfer And Separation In Electrography (AREA)
- Fixing For Electrophotography (AREA)
- Electrophotography Configuration And Component (AREA)
- Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)
Abstract
Description
Claims
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2020228821A AU2020228821B2 (en) | 2019-02-28 | 2020-01-31 | Image Forming Apparatus |
| CN202080008573.2A CN113316552B (zh) | 2019-02-28 | 2020-01-31 | 图像形成设备 |
| EP20763964.2A EP3932840A4 (en) | 2019-02-28 | 2020-01-31 | Image formation device |
| US17/340,845 US11493863B2 (en) | 2019-02-28 | 2021-06-07 | Image forming apparatus with holding unit that holds a recording medium |
| US17/967,049 US12072646B2 (en) | 2019-02-28 | 2022-10-17 | Image forming apparatus |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019035284A JP7268400B2 (ja) | 2019-02-28 | 2019-02-28 | 画像形成装置 |
| JP2019-035284 | 2019-02-28 |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US17/340,845 Continuation US11493863B2 (en) | 2019-02-28 | 2021-06-07 | Image forming apparatus with holding unit that holds a recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2020175016A1 true WO2020175016A1 (ja) | 2020-09-03 |
Family
ID=67438507
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2020/003830 Ceased WO2020175016A1 (ja) | 2019-02-28 | 2020-01-31 | 画像形成装置 |
Country Status (6)
| Country | Link |
|---|---|
| US (2) | US11493863B2 (ja) |
| EP (1) | EP3932840A4 (ja) |
| JP (1) | JP7268400B2 (ja) |
| CN (1) | CN113316552B (ja) |
| AU (1) | AU2020228821B2 (ja) |
| WO (1) | WO2020175016A1 (ja) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3974358A4 (en) * | 2019-09-20 | 2023-06-28 | Fujifilm Business Innovation Corp. | Image-forming device |
| JP7543769B2 (ja) * | 2020-08-12 | 2024-09-03 | 富士フイルムビジネスイノベーション株式会社 | 転写装置、及び画像形成装置 |
| JP2023031875A (ja) | 2021-08-25 | 2023-03-09 | 富士フイルムビジネスイノベーション株式会社 | 画像形成装置 |
| JP7732276B2 (ja) | 2021-08-25 | 2025-09-02 | 富士フイルムビジネスイノベーション株式会社 | 搬送装置、及び画像形成装置 |
| JP7775597B2 (ja) | 2021-08-25 | 2025-11-26 | 富士フイルムビジネスイノベーション株式会社 | 搬送装置、及び画像形成装置 |
| JP7643260B2 (ja) | 2021-08-25 | 2025-03-11 | 富士フイルムビジネスイノベーション株式会社 | 画像形成装置 |
| JP2023031876A (ja) | 2021-08-25 | 2023-03-09 | 富士フイルムビジネスイノベーション株式会社 | 画像形成装置 |
| JP2023059720A (ja) * | 2021-10-15 | 2023-04-27 | 富士フイルムビジネスイノベーション株式会社 | 画像形成装置 |
| JP2023059721A (ja) * | 2021-10-15 | 2023-04-27 | 富士フイルムビジネスイノベーション株式会社 | 画像形成装置 |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN113316552A (zh) | 2021-08-27 |
| JP7268400B2 (ja) | 2023-05-08 |
| US20210294246A1 (en) | 2021-09-23 |
| CN113316552B (zh) | 2023-10-03 |
| US20230038531A1 (en) | 2023-02-09 |
| AU2020228821A1 (en) | 2021-07-01 |
| EP3932840A1 (en) | 2022-01-05 |
| AU2020228821B2 (en) | 2023-03-16 |
| EP3932840A4 (en) | 2022-12-28 |
| JP2020140062A (ja) | 2020-09-03 |
| US12072646B2 (en) | 2024-08-27 |
| US11493863B2 (en) | 2022-11-08 |
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