US20060181015A1 - Device for releasing a pair of conveying members and image forming apparatus including the same - Google Patents

Device for releasing a pair of conveying members and image forming apparatus including the same Download PDF

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Publication number
US20060181015A1
US20060181015A1 US11/224,139 US22413905A US2006181015A1 US 20060181015 A1 US20060181015 A1 US 20060181015A1 US 22413905 A US22413905 A US 22413905A US 2006181015 A1 US2006181015 A1 US 2006181015A1
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United States
Prior art keywords
conveying
sheet
releasing
moving
pair
Prior art date
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Abandoned
Application number
US11/224,139
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English (en)
Inventor
Takayuki Takahashi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tohoku Ricoh Co Ltd
Original Assignee
Tohoku Ricoh Co Ltd
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Filing date
Publication date
Application filed by Tohoku Ricoh Co Ltd filed Critical Tohoku Ricoh Co Ltd
Assigned to TOHOKU RICOH COMPANY, LTD. reassignment TOHOKU RICOH COMPANY, LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: TAKAHASHI, TAKAYUKI
Publication of US20060181015A1 publication Critical patent/US20060181015A1/en
Abandoned legal-status Critical Current

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    • 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
    • B65H5/06—Feeding articles separated from piles; Feeding articles to machines by rollers or balls, e.g. between rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2403/00—Power transmission; Driving means
    • B65H2403/50—Driving mechanisms
    • B65H2403/51—Cam mechanisms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2601/00—Problem to be solved or advantage achieved
    • B65H2601/10—Ensuring correct operation
    • B65H2601/11—Clearing faulty handling, e.g. jams

Definitions

  • the present invention relates to a releasing device for releasing a pair of conveying members configured to convey a sheet while nipping it therebetween and an image forming apparatus including the same.
  • the conventional system described above has the following problem left unsolved. Assume that the drive means assigned to the arm member is energized due to a sheet jam or similar conveyance error occurred when the two feed rollers are held in contact with each other. Then, the arm member prevents the stop from smoothly protruding into the locus of angular movement of the arm member. Stated another way, the stop cannot function at all unless the cam holds the arm member in the releasing position. Therefore, even if the drive means assigned to the stop is energized as soon as, e.g., a sheet jam is sensed, the feed rollers, contacting each other, cannot be released immediately in dependence on the position of the arm member. As a result, the feed rollers convey a sheet and aggravate the sheet jam condition, rendering recovery work extremely troublesome.
  • a releasing device of the present invention selectively moves one of a pair of conveying members for conveying a sheet into or out of contact with the other conveying member.
  • a first moving device moves the one conveying member into or out of contact with the other conveying member.
  • a second moving device 72 is connected to the first moving device for moving the one conveying member in a releasing direction independently of the operation of the first moving means.
  • An image forming apparatus including the above releasing means is also disclosed.
  • FIG. 2 is a plan view showing a releasing device included in the illustrative embodiment
  • FIG. 5 is an enlarged section showing the operation of second moving means included in the releasing device
  • FIG. 6 is a schematic block diagram showing a control system included in the illustrative embodiment
  • FIG. 8 is a block diagram showing a control system included in the modification of the illustrative embodiment.
  • An image scanner or image reading section 40 is mounted on the top of the printer body 1 and has a conventional construction including a scanning unit 41 A and a CCD (Charge Coupled device) image sensor or similar image sensor 41 B. While the scanning unit 41 A reads a document image, image data scanned by the scanning unit 31 A are input to the image sensor 41 B.
  • CCD Charge Coupled device
  • the sheet feeding section 3 includes a sheet tray 10 loaded with a stack of sheets 2 .
  • Feed rollers 11 cooperated to pay out the top sheet 2 from the sheet tray 10 toward a registration roller pair or conveying member pair 12 while separating the underlying sheets from the top sheet.
  • the registration roller pair 12 once stops the sheet to correct skew thereof and then conveys it toward the printing section 4 at preselected timing.
  • a sheet path 26 extends from the feed rollers 11 to the printing section 4 .
  • the registration roller pair 12 is made up of a drive roller or elastic member 12 A formed of rubber and facing the sheet path 26 from below the same and a driven roller 12 B formed of resin and facing the sheet path 26 from above the same.
  • the driven roller 12 B is held in contact with the drive roller 12 A in such a manner as to be releasable from the latter, as will be described specifically later.
  • the driven roller 12 B may be formed of metal, if desired.
  • a stepping motor or drive motor 28 causes the drive roller 12 A to rotate.
  • the driven roller 12 B contacting the circumference of the drive roller 12 A, is caused to rotate by the drive roller 12 A.
  • a jam sensor or conveyance error sensing means 27 is positioned on part of the sheet path extending between the registration roller pair 12 and the printing section 4 .
  • the jam sensor 27 is configured to output a jam signal on sensing a sheet jam, which is a specific conveyance error.
  • the printing section 4 is formed between a print drum 20 and a press roller or pressing member 22 .
  • the print drum 20 is a porous, hollow cylindrical body configured such that the master 19 produced by the master making section 7 is to be wrapped around its outer periphery 20 a .
  • the press roller 22 is selectively moved into or out of contact with the outer periphery 20 a of the drum 20 by a mechanism, not shown, and presses, when moved into contact with the periphery 20 a , the sheet 2 against the periphery 20 a .
  • the press roller 22 serving as a pressing member, may be replaced with a conventional print drum, if desired.
  • the sheet discharging section 6 includes a peeler 23 for peeling off the sheet 2 adhering to the master 19 on the print drum 20 due to the viscosity of ink.
  • a belt conveyor 25 conveys the sheet 2 coming out of the printing section 4 while sucking it with a suction fan 24 .
  • Such sheets or prints, sequentially driven out of the printer body 1 are sequentially stacked on a print tray 35 .
  • the releasing device 70 includes first moving means 71 and second moving means 72 .
  • the first moving means 71 is configured to selectively move the driven roller 12 B into or out of contact with the drive roller 12 A.
  • the second moving means 72 is connected to the first moving means 71 in such a manner as to move the driven roller 12 B away from the first roller 12 A (spacing direction hereinafter) independently of the operation of the first moving means 71 .
  • the first moving means 72 includes a pair of arms or angularly movable members 73 A and 73 B supporting the driven roller 12 B and moving it into or out of contact with the drive roller 12 A.
  • a pair of coiled tension springs or biasing members 74 A and 74 B cooperate to constantly bias the arms 73 A and 73 B toward the drive roller 12 A.
  • a cam member 75 is rotatably connected to the arm 73 A and rotatable to move the arms 73 A and 73 B in a contacting/spacing direction.
  • a shaft 76 extends in a direction Y perpendicular to a direction of sheet conveyance X, as seen in a plan view.
  • the direction Y corresponds to the widthwise direction of a sheet and will be referred to as a widthwise direction Y hereinafter.
  • the driven roller 12 B is 15 implemented as a plurality of rollers rotatably mounted on the shaft 76 at preselected intervals.
  • the drive roller 12 A is implemented as a plurality of rollers rotatably mounted on a shaft 77 , which also extends in the widthwise direction Y, at preselected intervals and each facing one of the driven 20 rollers 12 B.
  • a stepping motor 28 is drivably connected to the shaft or drive shaft 77 via a drive transmission mechanism not shown.
  • Opposite ends of the shaft 76 are affixed to one end 73 a of the arms 73 A and 73 B.
  • the other ends 73 b of the arms 73 A 25 and 73 B are affixed to a rotatable shaft 78 journalled to the printer body 1 , FIG. 1 , so that the arms 73 A and 73 B can move the driven roller 12 B toward or away from the drive roller 12 A.
  • the tension springs 74 A and 74 B are respectively retained by the arm members .
  • a cam follower arm 81 is affixed to the end 78 a of the rotatable shaft 78 at one end 81 b and therefore angularly movable in interlocked relation to the arm members 73 A and 73 B.
  • a roller 80 is rotatably mounted on the other or free end 81 a of the cam follower arm 81 .
  • the cam member 75 is operatively connected to a drive transmission mechanism, not shown, in such a manner as to rotate about a shaft 82 in synchronism with the rotation of the print drum 20 when the main motor 29 is energized.
  • the can member 78 is configured to make a single rotation in synchronism with a single rotation of the print drum 20 .
  • the cam member 75 has a circumferential cam surface 75 a facing the roller 80 of the cam follower arm 81 .
  • the roller 80 is constantly pressed against the cam surface 75 a by the force of the tension springs 74 A and 74 B.
  • the cam surface 75 a of the cam member 75 has a profile configured to maintain the driven roller 12 B in contact with the drive roller 12 A, as shown in FIG. 3 , until the sheet 2 driven by the registration roller pair 12 has been nipped between the print drum 20 and the press roller 22 , move the driven roller 12 B away from the drive roller 12 A, as shown in FIG. 4 , when the leading edge of the sheet 2 is nipped between the print drum 20 and the press roller 22 , and again bring the driven roller 12 B to the position of FIG. 3 for conveying the next sheet 2 .
  • the driven roller 12 B is pressed against the drive roller 12 A by the tension springs 74 A and 74 B when held in the contact position shown in FIG. 3 .
  • the second moving means 72 includes a pin 85 studded on the rotatable shaft 78 .
  • a link member 86 is connected to the arm members 73 A and 73 B at one end 86 a thereof via the pin 85 and shaft 78 .
  • a release motor 87 is drivably connected to the other end 86 b of the link member 86 in order to move the link member 86 in a direction in which the arm members 73 A and 73 B move the driven roller 12 B away from the drive roller 12 A. This direction will be referred to as a releasing direction hereinafter.
  • a slot 89 is formed in one end portion 86 a of the link member 86 and extends in the releasing direction mentioned above.
  • the pin 85 studded on the shaft 78 , is loosely fitted in the slot 89 . This configuration prevents the link member 86 from being displaced when the arm members 73 A and 73 B are angularly moved by the cam member 75 .
  • a worm gear 88 is mounted on the output shaft of the release motor 87 , which is implemented as a stepping motor or a DC motor, and held in mesh with a gear portion 90 formed at the other end 86 b of the link member 86 .
  • the release motor 87 is driven to rotate the worm gear 88 clockwise, as viewed in FIG. 3
  • the worm gear 88 causes the link member 86 to move rightward, i.e., in the releasing direction.
  • FIG. 6 is a schematic block diagram showing a control system included in the illustrative embodiment.
  • the control system includes the control unit 50 mentioned previously and constituted by a conventional computer including a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory) and a timer.
  • a CPU Central Processing Unit
  • ROM Read Only Memory
  • RAM Random Access Memory
  • a sheet-feed drive section 42 for driving the sheet feeding section 3 including the stepping motor 18
  • a scanner drive section 43 including a drive source for driving the entire scanner 40 inclusive of the main motor 29
  • a master-make drive section 44 including a drive source assigned to the entire master making section 7
  • a print drive section 45 including a drive source for driving the entire printing section 4
  • a sheet-discharge drive section 46 including a drive section for driving the belt conveyor 25
  • the release motor 87 Connected to the output side of the control unit 50 are a sheet-feed drive section 42 for driving the sheet feeding section 3 including the stepping motor 18
  • a scanner drive section 43 including a drive source for driving the entire scanner 40 inclusive of the main motor 29
  • a master-make drive section 44 including a drive source assigned to the entire master making section 7
  • a print drive section 45 including a drive source for driving the entire printing section 4
  • a sheet-discharge drive section 46 including a drive section for driving the belt conveyor 25
  • the release motor 87 Connected
  • the jam sensor 27 and image scanner 40 and a control panel 60 are connected to the input side of the control unit 50 .
  • the control panel 50 includes a release key switch or release commanding means 61 for outputting a release command signal and a return key switch or return commanding means 62 for outputting a return command signal.
  • the operator of the printer may operate the release key switch 61 when desiring to release the driven roller 12 B from the drive roller 12 A or operate the return key switch 62 after the removal of a jamming sheet or when desiring to return the driven roller 12 B to the contact position.
  • the control unit 50 controls the entire printing operation of the printer body 1 . Further, when a jam signal is input to the control unit 50 from the jam sensor 27 , the control unit 50 drives the release motor 87 in a direction that causes the link member 86 to move in the releasing direction, while interrupting the operation of the other devices. Also, when a release command signal is input to the control unit 50 from the release key switch 61 , the control unit 50 drives the release motor 87 in the above direction. When the operator operates the return key switch 61 , the control unit 50 drives, in response to the resulting return command signal, the release motor 87 in the opposite direction that causes the link member 86 to return to its initial position.
  • the control unit 50 causes the sheet-feed drive section 42 to rotate the feed rollers 11 for thereby feeding the top sheet 2 from the sheet tray 10 . Further, the control unit 50 causes the print drive section 45 to rotate the print drum 20 at a peripheral speed matching a preselected print speed. At this instant, although the driven roller 12 B is held in contact with the drive roller 12 A, as shown in FIG. 3 , the stepping motor 28 is not driven, so that the leading edge of the sheet 2 is nipped and therefore stopped by the registration roller pair 12 . The cam member 75 is rotated in synchronism with the print drum 20 .
  • the control unit 50 starts driving the stepping motor 28 . Consequently, the registration roller pair 12 starts conveying the sheet 2 toward the printing section 4 between the print drum 20 and the press roller 22 . Then, the press roller 22 is brought into contact with the print drum 20 for forming an image on the sheet 2 .
  • the driven roller 12 B When the driven roller 12 B is released from the drive roller 12 A, the sheet 2 , now free from the resistance of the registration roller pair 12 , is conveyed in accordance with the peripheral speed of the print drum 20 .
  • the pin 85 moves in interlocked relation to the arm members 73 A and 73 B, the slot 89 absorbs the movement of the pin 85 to thereby prevent the link member 86 from moving in the releasing direction and exerting a load on the release motor 87 .
  • the sheet 2 carrying an image transferred thereto from the master 19 at the printing section 4 , is driven out to the print tray 25 by the belt conveyor 25 , which includes the suction fan 24 , FIG. 1 , as stated earlier.
  • control unit 5 O causes the printer to stop operating.
  • the control unit 50 drives the release motor 87 while interrupting the operation of the other sections of the printer.
  • the release motor 87 causes the link member 86 to move in the releasing direction or rightward, as indicated by an arrow, while pulling the pin 85 loosely fitted in the slot 89 in the same direction. Consequently, the shaft 78 is forcibly rotated clockwise without regard to the position of the cam member 75 , releasing the roller 80 mounted on the cam follower arm 81 from the cam surface 75 a of the cam member 75 .
  • This causes the arm members 73 A and 73 B to turn clockwise against the action of the tension springs 74 A and 74 B, thereby releasing the driven roller 12 B from the drive roller 12 A.
  • the printer immediately stops operating and causes the release motor 87 to move the arm members 73 A and 73 B and cam follower arm 81 in the spacing direction.
  • the driven roller 12 and drive roller 12 A are immediately released from each other without regard to the position of the cam member 75 . This prevents the sheet 2 from being conveyed by the drive roller 12 A and driven roller 12 B pressed against each other in the direction X and therefore prevents the sheet jam from being aggravated, allowing the operator to easily remove a jamming sheet 2 .
  • the link member 86 and release motor 87 are interconnected by the gear portion 90 and worm gear 88 held in mesh with each other. It follows that even if the power supply to the release motor 87 is shut off while the operator is dealing with a sheet jam, the arm members 73 A and 73 B and cam follower arm, 81 are prevented from being returned toward the contact position under the action of the tension springs 74 A and 74 B. This further promotes easy removal of a jamming sheet 2 .
  • the control unit 50 causes the release motor 87 to rotate in the direction opposite to the direction in which it rotated in the event of release, so that the link member 86 moves leftward, as viewed in FIG. 5 , opposite to the releasing direction (rightward) while entraining the pin 85 received in the slot 89 in the same direction.
  • the pin 85 causes the shaft 78 to rotate counterclockwise, as viewed in FIG. 5 , such that the cam follower arm 81 moves the roller 80 toward the cam surface 75 a of the cam member 75 .
  • the stencil printer is left unused over a long time, depending on the user's circumstances. This brings about a problem that if the driven roller 12 B is pressed against the drive roller 12 A throughout the unused period, then the rollers 12 A and 12 B are apt to deform due to the force of the tension springs 74 A and 74 B constantly acting thereon.
  • the illustrative embodiment solves this problem with the following configuration.
  • the operator of the printer operates the release key switch 61 .
  • the control unit 50 drives the release motor 87 to cause the link member 86 to move in the releasing direction, i.e., rightward in FIG. 5 while entraining the pin 86 received in the slot 89 in the same direction.
  • the shaft 78 is rotated clockwise without regard to the position of the cam member 75 , releasing the roller 80 of the cam follower arm 81 from the cam surface 75 a of the cam member 75 .
  • This causes the arm members 73 A and 73 B to turn clockwise against the action of the tension springs 74 A and 74 B, thereby releasing the driven roller 12 B from the drive roller 12 A.
  • the operator may operate the release key switch 61 any time in order to release the driven roller 12 B from the drive roller 12 A without regard to the position of the cam member 75 .
  • This successfully protects the drive roller 12 A and driven roller 12 B from deformation ascribable to the force of the tension springs 74 A and 74 B even when the printer is left unused over a long time.
  • the drive source of the second moving means 72 is implemented by a solenoid 97 having a plunger 97 a instead of the release motor 87 .
  • the modification is identical with the illustrative embodiment.
  • the plunger 97 a of the solenoid 97 is pinned to the end 86 b of the link member 86 .
  • the solenoid 97 is of the type pulling the plunger 97 a when energized. If desired, the plunger 97 a may be directly connected to the pin 86 without the intermediary of the link member 86 , in which case the slot 89 , FIG. 3 , will be formed in the plunger 97 a.
  • FIG. 8 shows a control system included in the above modification.
  • the solenoid 97 is connected to the output side of a control unit 50 A, which is basically identical with the control means 50 , FIG. 6 , in configuration and function. The difference is that the control unit 50 A energizes the solenoid 97 in response to a jam signal output from the jam sensor 27 or a release command signal output from the release key switch 61 and deenergizes the solenoid 97 in response to a return command signal output from the return key switch 62 .
  • the control unit 50 A energizes the solenoid 97 while interrupting the operation of the other sections of the printer.
  • the solenoid 97 causes the link member 86 to move in the releasing direction or rightward while pulling the pin 85 loosely fitted in the slot 89 in the same direction. Consequently, the shaft 78 is forcibly rotated clockwise without regard to the position of the cam member 75 , releasing the roller 80 mounted on the cam follower arm 81 from the cam surface 75 a of the cam member 75 .
  • This causes the arm members 73 A and 73 B to turn clockwise against the action of the tension springs 74 A and 74 B, thereby releasing the driven roller 12 B from the drive roller 12 A.
  • the printer immediately stops operating and causes the solenoid 97 to move the arm members 73 A and 73 B and cam follower arm 81 in the spacing direction.
  • the driven roller 12 and drive roller 12 A are immediately released from each other without regard to the position of the cam member 75 . This prevents the sheet 2 from being conveyed by the drive roller 12 A and driven roller 12 B pressed against each other in the direction X and therefore prevents the sheet jam from being aggravated, allowing the operator to easily remove a jamming sheet 2 .
  • the control unit 50 deenergizes the solenoid 97 .
  • the force of the tension springs 74 A and 74 B and the total weight of the arms and rollers act on the link member 86 and cause it to move leftward, as viewed in FIG. 7 , inverse to the releasing direction (rightward) while entraining the pin 85 received in the slot 89 in the same direction.
  • the pin 85 causes the shaft 78 to rotate counterclockwise such that the cam follower arm 81 moves the roller 80 toward the cam surface 75 a of the cam member 75 .
  • the arms 73 A and 73 B are angularly moved counterclockwise under the action of the tension springs 74 A and 74 B as well, causing the driven roller 12 B to contact the drive roller 12 B.
  • the operator is allowed to operate the release key switch 61 any time in order to release the driven roller 12 B from the drive roller 12 A, as desired.
  • the releasing device 70 is applied to the registration roller pair 12 by way of example.
  • the releasing device 70 is similarly applicable to any other conveying members that cooperate to convey the sheet 2 while nipping it therebetween.
  • conveying members to which the releasing device 70 is applicable are not limited to a pair of rollers.
  • a pair of rollers may be replaced with the combination of a drive belt member and a driven roller member contacting or preferably pressed against the belt member or the combination of a drive belt member and a driven belt member contacting or pressed against each other.
  • the cooperative conveying members may even be replaced with members neither one of which is driven or both of which are driven.
  • the stencil printer including the releasing means 70 shown and described is merely an example of a printer.
  • the printer may be replaced with any other image forming apparatus, e.g., a conventional electrophotographic image forming apparatus in which an image transfer station is formed between a photoconductive element or image carrier, which is implemented as a drum or a belt on which a toner image is to be formed, and an image transfer member implemented as a roller or a belt and configured to transfer the toner image to a sheet.
  • the present invention provides a releasing device capable of allowing a jamming sheet to be easily removed with first moving means for moving one of two conveying members into or out of contact with the other conveying member and second moving means connected to the first moving means for moving the one conveying member away from the other conveying member independently of the first moving means.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Delivering By Means Of Belts And Rollers (AREA)
  • Separation, Sorting, Adjustment, Or Bending Of Sheets To Be Conveyed (AREA)
  • Controlling Sheets Or Webs (AREA)
US11/224,139 2004-10-28 2005-09-13 Device for releasing a pair of conveying members and image forming apparatus including the same Abandoned US20060181015A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2004-314585(JP) 2004-10-28
JP2004314585A JP4920882B2 (ja) 2004-10-28 2004-10-28 搬送部材解除装置及びそれを備えた画像形成装置

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JP (1) JP4920882B2 (ja)
CN (1) CN100520610C (ja)

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US20060071419A1 (en) * 2004-09-06 2006-04-06 Samsung Electronics Co., Ltd. Paper feeding device of image forming apparatus and image forming apparatus having the same
US20070029725A1 (en) * 2005-08-08 2007-02-08 Marx Martin J Nip pressure
US20080106565A1 (en) * 2006-11-08 2008-05-08 Seiko Epson Corporation Printing apparatus
US20090224466A1 (en) * 2008-03-07 2009-09-10 Canon Kabushiki Kaisha Image reader and image forming apparatus
US20100025917A1 (en) * 2008-07-29 2010-02-04 Canon Kabushiki Kaisha Sheet conveying apparatus and image forming apparatus
US20100090391A1 (en) * 2008-10-10 2010-04-15 Xerox Corporation Nip release system
US20100276877A1 (en) * 2009-04-30 2010-11-04 Xerox Corporation Moveable drive nip
CN102233747A (zh) * 2010-04-28 2011-11-09 兄弟工业株式会社 片材馈送装置和记录设备
US9027923B2 (en) 2010-10-13 2015-05-12 Canon Kabushiki Kaisha Sheet conveying apparatus and image forming apparatus

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JP5627384B2 (ja) * 2010-10-13 2014-11-19 キヤノン株式会社 シート搬送装置及び画像形成装置

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US7448624B2 (en) * 2004-09-06 2008-11-11 Samsung Electronics Co., Ltd. Paper feeding device of image forming apparatus and image forming apparatus having the same
US20060071419A1 (en) * 2004-09-06 2006-04-06 Samsung Electronics Co., Ltd. Paper feeding device of image forming apparatus and image forming apparatus having the same
US20070029725A1 (en) * 2005-08-08 2007-02-08 Marx Martin J Nip pressure
US7455295B2 (en) * 2005-08-08 2008-11-25 Hewlett-Packard Development Company, L.P. Nip pressure
US7841683B2 (en) * 2006-11-08 2010-11-30 Seiko Corporation Printing apparatus
US20080106565A1 (en) * 2006-11-08 2008-05-08 Seiko Epson Corporation Printing apparatus
US7926897B2 (en) 2006-11-08 2011-04-19 Seiko Epson Corporation Printing apparatus
US20110037817A1 (en) * 2006-11-08 2011-02-17 Seiko Epson Corporation Printing apparatus
US20090224466A1 (en) * 2008-03-07 2009-09-10 Canon Kabushiki Kaisha Image reader and image forming apparatus
US7753355B2 (en) * 2008-03-07 2010-07-13 Canon Kabushiki Kaisha Image reader and image forming apparatus
US20100025917A1 (en) * 2008-07-29 2010-02-04 Canon Kabushiki Kaisha Sheet conveying apparatus and image forming apparatus
US7992870B2 (en) * 2008-07-29 2011-08-09 Canon Kabushiki Kaisha Sheet conveying apparatus and image forming apparatus
US20100090391A1 (en) * 2008-10-10 2010-04-15 Xerox Corporation Nip release system
US20110187046A1 (en) * 2008-10-10 2011-08-04 Xerox Corporation Nip release system
US8474818B2 (en) 2008-10-10 2013-07-02 Xerox Corporation Nip release system
US20100276877A1 (en) * 2009-04-30 2010-11-04 Xerox Corporation Moveable drive nip
US8746692B2 (en) 2009-04-30 2014-06-10 Xerox Corporation Moveable drive nip
CN102233747A (zh) * 2010-04-28 2011-11-09 兄弟工业株式会社 片材馈送装置和记录设备
US8646904B2 (en) 2010-04-28 2014-02-11 Brother Kogyo Kabushiki Kaisha Sheet feeding device and recording apparatus
US9027923B2 (en) 2010-10-13 2015-05-12 Canon Kabushiki Kaisha Sheet conveying apparatus and image forming apparatus

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CN1766745A (zh) 2006-05-03
JP4920882B2 (ja) 2012-04-18
CN100520610C (zh) 2009-07-29

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