US20090189343A1 - Paper-feeding mechanism - Google Patents

Paper-feeding mechanism Download PDF

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Publication number
US20090189343A1
US20090189343A1 US12/126,923 US12692308A US2009189343A1 US 20090189343 A1 US20090189343 A1 US 20090189343A1 US 12692308 A US12692308 A US 12692308A US 2009189343 A1 US2009189343 A1 US 2009189343A1
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US
United States
Prior art keywords
paper
stop means
output tray
feeding mechanism
feeding
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.)
Abandoned
Application number
US12/126,923
Inventor
Tien-Ho Hsu
Chen-Tsai Tsai
Hsueh-Chou Hsu
Yu-Jen Tsao
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.)
Silitek Electronic Guangzhou Co Ltd
Lite On Technology Corp
Original Assignee
Silitek Electronic Guangzhou Co Ltd
Lite On Technology Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Silitek Electronic Guangzhou Co Ltd, Lite On Technology Corp filed Critical Silitek Electronic Guangzhou Co Ltd
Assigned to SILITEK ELECTRONIC(GUANGZHOU)CO.,LTD., LITE-ON TECHNOLOGY CORP. reassignment SILITEK ELECTRONIC(GUANGZHOU)CO.,LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HSU, HSUEH-CHOU, HSU, TIEN-HO, TSAI, CHEN-TSAI, TSAO, YU-JEN
Publication of US20090189343A1 publication Critical patent/US20090189343A1/en
Abandoned legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H3/00—Separating articles from piles
    • B65H3/46—Supplementary devices or measures to assist separation or prevent double feed
    • B65H3/56—Elements, e.g. scrapers, fingers, needles, brushes, acting on separated article or on edge of the pile
    • 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
    • B65H29/12—Delivering or advancing articles from machines; Advancing articles to or into piles by means of the nip between two, or between two sets of, moving tapes or bands or rollers
    • B65H29/14—Delivering or advancing articles from machines; Advancing articles to or into piles by means of the nip between two, or between two sets of, moving tapes or bands or rollers and introducing into a pile
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H85/00—Recirculating articles, i.e. feeding each article to, and delivering it from, the same machine work-station more than once
    • 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
    • G03G15/65—Apparatus which relate to the handling of copy material
    • G03G15/6502—Supplying of sheet copy material; Cassettes therefor
    • G03G15/6511—Feeding devices for picking up or separation of copy sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/10—Selective handling processes
    • B65H2301/13—Relative to size or orientation of the material
    • B65H2301/132—Relative to size or orientation of the material single face or double face
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/30—Orientation, displacement, position of the handled material
    • B65H2301/33—Modifying, selecting, changing orientation
    • B65H2301/333—Inverting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/30—Orientation, displacement, position of the handled material
    • B65H2301/33—Modifying, selecting, changing orientation
    • B65H2301/333—Inverting
    • B65H2301/3331—Involving forward reverse transporting means
    • B65H2301/33312—Involving forward reverse transporting means forward reverse rollers pairs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2404/00—Parts for transporting or guiding the handled material
    • B65H2404/70—Other elements in edge contact with handled material, e.g. registering, orientating, guiding devices
    • B65H2404/72—Stops, gauge pins, e.g. stationary
    • B65H2404/722—Stops, gauge pins, e.g. stationary movable in operation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2405/00—Parts for holding the handled material
    • B65H2405/10—Cassettes, holders, bins, decks, trays, supports or magazines for sheets stacked substantially horizontally
    • B65H2405/11—Parts and details thereof
    • B65H2405/113—Front, i.e. portion adjacent to the feeding / delivering side
    • B65H2405/1134—Front, i.e. portion adjacent to the feeding / delivering side movable, e.g. pivotable
    • 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 a paper-feeding mechanism, and more particularly, to a paper-feeding mechanism capable of preventing paper from entering to a nip between a duplex drive roller and an idle roller incorrectly.
  • FIG. 1 is a diagram of conveying paper S to an output tray 5 in a duplex feeding mode in the prior art.
  • FIG. 2 is a diagram of conveying back the paper S in the duplex feeding mode in the prior art.
  • the paper S is drawn out piece by piece along a feeding path to an image-forming section. After imaging the paper S, the paper S is conveyed from a terminal end of the feeding path to the output tray 5 .
  • FIG. 1 is a diagram of conveying paper S to an output tray 5 in a duplex feeding mode in the prior art.
  • FIG. 2 is a diagram of conveying back the paper S in the duplex feeding mode in the prior art.
  • the paper S is drawn out piece by piece along a feeding path to an image-forming section. After imaging the paper S, the paper S is conveyed from a terminal end of the feeding path to the output tray 5 .
  • FIG. 1 is a diagram of conveying paper S to an output tray 5 in a duplex feeding mode in the prior art.
  • FIG. 2
  • a duplex drive roller 22 and a first idle roller 33 drive the paper S with a single printed side to the output tray 5 , and a leading edge of the paper S falls on a paper stack 13 on the output tray 5 .
  • the duplex drive roller 2 rotates reversely and drives the paper S with the first idle roller 33 back to the feeding path so as to print the other side of the paper S. At this time, the previous leading edge converts into a trailing edge of the paper S.
  • the paper-feeding mechanism utilized for an image-forming device includes a duplex drive roller disposed on a terminal end of a feeding path of the image-forming device for feeding paper and on a side of an output tray, a first idle roller for conveying the paper back to the output tray with the duplex drive roller after a single side of the paper is printed, a second idle roller for conveying the paper back to the output tray with the duplex drive roller after double sides of the paper are printed, and a stop means installed between the terminal end of the feeding path and the output tray for switching to a shut position to stop the paper when the paper is driven back to the feeding path and for switching to an open position not to stop the paper when the paper is driven to the output tray after the double sides of the paper are printed.
  • FIG. 1 is a diagram of conveying paper to an output tray in a duplex feeding mode in the prior art.
  • FIG. 2 is a diagram of conveying back the paper in the duplex feeding mode in the prior art.
  • FIG. 3 is a perspective drawing of a paper-feeding mechanism utilized for an image-forming device according to a preferred embodiment of the present invention.
  • FIG. 4 is a diagram of paper conveying to an output tray after a single side of the paper is printed in a duplex feeding mode according to the preferred embodiment of the present invention.
  • FIG. 5 is a diagram of the paper conveying back for printing the other side of the paper in the duplex feeding mode according to the preferred embodiment of the present invention.
  • FIG. 6 is a diagram of the paper conveying out of a feeding path after printing double sides of the paper in the duplex feeding mode according to the preferred embodiment of the present invention.
  • FIG. 7 is a diagram of the paper conveying to the output tray after printing the double sides of the paper in the duplex feeding mode according to the preferred embodiment of the present invention.
  • FIG. 8 is a perspective drawing of a paper-feeding mechanism utilized for an image-forming device according to another preferred embodiment of the present invention.
  • FIG. 3 is a perspective drawing of a paper-feeding mechanism utilized for an image-forming device according to a preferred embodiment of the present invention.
  • FIG. 4 is a diagram of paper conveying to an output tray 5 after a single side of the paper is printed in a duplex feeding mode according to the preferred embodiment of the present invention.
  • FIG. 5 is a diagram of the paper conveying back for printing the other side of the paper in the duplex feeding mode according to the preferred embodiment of the present invention.
  • FIG. 6 is a diagram of the paper conveying out of a feeding path after printing double sides of the paper in the duplex feeding mode according to the preferred embodiment of the present invention.
  • FIG. 4 is a diagram of paper conveying to an output tray 5 after a single side of the paper is printed in a duplex feeding mode according to the preferred embodiment of the present invention.
  • FIG. 5 is a diagram of the paper conveying back for printing the other side of the paper in the duplex feeding mode according to the preferred embodiment of the present invention.
  • FIG. 6 is a diagram
  • the paper-feeding mechanism is utilized for the image-forming device with the duplex feeding function, such a scanner, a multifunction product, a printer with a duplex printing function, and so on.
  • the paper-feeding mechanism is disposed on a terminal end of the feeding path of the image-forming device.
  • a drive shaft 7 is connected to a frame on lateral sides of the terminal end of the feeding path of the image-forming device and is driven by a motor (not shown in figures).
  • a duplex drive roller 22 is installed on the drive shaft 7 .
  • a first idle roller 33 and a second idle roller 44 are disposed on an upper side and a bottom side of the duplex drive roller 22 respectively, and the first idle roller 33 and the second idle roller 44 cooperate with the duplex drive roller 22 .
  • the duplex drive roller 22 rotates forward, the duplex drive roller 22 and the first idle roller 33 drive the paper with a single printed side to a print an image-forming section.
  • the duplex drive roller 22 rotates backward, the duplex drive roller 22 and the first idle roller 33 drive the paper with the single printed side to the feeding path again.
  • a hole 61 is disposed below the second idle roller 44 on the frame nearby the terminal end of the feeding path.
  • the stop means 6 is connected to a shaft 62 .
  • the stop means 6 includes a connecting part 68 fixed on the shaft 62 , a top part 66 , and an arched part 69 formed between the connecting part 68 and the top part 66 .
  • An arched cavity of the arched part 69 is disposed opposite to an exit direction of the paper.
  • the stop means 6 can be paired to dispose preferredly.
  • the shaft 62 connected to the stop means 6 is pivoted inside the hole 61 in a rotatable manner.
  • the stop means 6 is switched to a shut position.
  • the stop means 6 rotates around the shaft 62 to be switched from the shut position to an open position so as to convey the paper to the output tray 5 .
  • a torsional spring 63 is sheathed on the shaft 62 for turning the stop means 6 from the open position to the shut position.
  • the torsional spring 63 includes a fixing part 631 wedged inside a cavity 641 of a casing 64 , and a pushing part 632 contacting against a face neighboring to the output tray 5 of the stop means 6 .
  • the pushing part 632 of the torsional spring 63 is pressed down. After the paper has been conveyed to the output tray 5 completely, the restoring force of the torsional spring 63 drives the pushing part 632 to an original position so that the stop means 6 restores to the shut position.
  • the duplex drive roller 22 and the first idle roller 33 drive the paper with one printed side along the feeding path (not shown in figures) to the output tray 5 in a duplex feeding mode.
  • the leading edge of the paper S falls on the paper stack 13 but the paper S has not been conveyed to the output tray 5 completely after the paper S moves at a certain distance.
  • the duplex drive roller 22 rotates reversely and drives the paper S back to the feeding path with the first idle roller 33 .
  • the previous leading edge converts into a trailing edge of the paper S. It is possible that the frictional force between the paper S and the paper stack 13 draws the paper S to the nip between the duplex drive roller 22 and the second idle roller 44 incorrectly.
  • the stop means 6 between the terminal end of the feeding path and the output tray 5 is located in the shut position and in front of the nip between the duplex drive roller 22 and the second idle roller 44 .
  • the leading edge of the paper S drawn to the nip between the duplex drive roller 22 and the second idle roller 44 incorrectly will be blocked by the stop means 6 and can not enter to the nip between the duplex drive roller 22 and the second idle roller 44 for preventing the paper jam.
  • the duplex drive roller 22 and the second idle roller 44 drive the paper S to the output tray 5 .
  • the leading edge of the paper S pushes the stop means 6 from the shut position to the open position so as to convey the paper S to the output tray 5 smoothly.
  • the pushing part 632 of the torsional spring 63 is pressed down by the stop means 6 in the open situation.
  • the paper S can not apply force to the stop means 6 and the restoring force of the torsional spring 63 drives the pushing part 632 to the shut position so that the stop means 6 is capable of preventing the next paper from entering to the nip between the duplex drive roller 22 and the second idle roller 44 incorrectly.
  • FIG. 8 is a perspective drawing of a paper-feeding mechanism utilized for an image-forming device according to another preferred embodiment of the present invention.
  • a weight stack 67 is to substitute the torsional spring 63 as a restoring means.
  • the weight stack 67 is connected to an end of the shaft 62 .
  • the weight stack 67 and the shaft 62 can be integrated preferredly.
  • the weight stack 67 connected to the end of the shaft 62 rises. After the paper S has been conveyed to the output tray 5 completely, the paper S can not apply force to the stop means 6 and the weight stack 67 goes down by the gravity thereof so that the stop means 6 restores to the shut position for preventing the next paper from entering to the nip between the duplex drive roller 22 and the second idle roller 44 incorrectly.
  • the present invention provides the restoring means to block the paper in front the nip between the duplex drive roller and the second idle roller when the frictional force between the paper and the paper stack draws the paper to the nip between the duplex drive roller and the second idle roller incorrectly so as to prevent the paper jam effectively.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Pile Receivers (AREA)
  • Delivering By Means Of Belts And Rollers (AREA)
  • Conveyance By Endless Belt Conveyors (AREA)

Abstract

The paper-feeding mechanism includes a duplex drive roller disposed on a terminal end of a feeding path of an image-forming device for feeding paper and on a side of an output tray, a first idle roller for conveying the paper back to the output tray with the duplex drive roller after a single side of the paper is printed, a second idle roller for conveying the paper back to the output tray with the duplex drive roller after double sides of the paper are printed, and a stop means installed between the terminal end of the feeding path and the output tray for switching to a shut position to stop the paper when the paper is driven back to the feeding path and for switching to an open position when the paper is driven to the output tray after the double sides of the paper are printed.

Description

    BACKGROUND OF THE INVENTION
  • 1. Field of the Invention
  • The present invention relates to a paper-feeding mechanism, and more particularly, to a paper-feeding mechanism capable of preventing paper from entering to a nip between a duplex drive roller and an idle roller incorrectly.
  • 2. Description of the Prior Art
  • Image-forming devices with a duplex feeding function are widely used due to efficient utilization and cost down of paper. Please refer to FIG. 1 and FIG. 2. FIG. 1 is a diagram of conveying paper S to an output tray 5 in a duplex feeding mode in the prior art. FIG. 2 is a diagram of conveying back the paper S in the duplex feeding mode in the prior art. The paper S is drawn out piece by piece along a feeding path to an image-forming section. After imaging the paper S, the paper S is conveyed from a terminal end of the feeding path to the output tray 5. Please refer to FIG. 1, a duplex drive roller 22 and a first idle roller 33 drive the paper S with a single printed side to the output tray 5, and a leading edge of the paper S falls on a paper stack 13 on the output tray 5. Please refer to FIG. 2. Then the duplex drive roller 2 rotates reversely and drives the paper S with the first idle roller 33 back to the feeding path so as to print the other side of the paper S. At this time, the previous leading edge converts into a trailing edge of the paper S. There is frictional force between the paper S and the paper stack 13 on the output tray 5 because the paper S contacts with the paper stack 13 so that it is possible that the frictional force draws the paper S to a nip between the duplex drive roller 22 and a second idle roller 44 incorrectly resulting in a paper jam.
    • SUMMARY OF THE INVENTION
  • It is therefore a primary objective of the claimed invention to provide a paper-feeding mechanism capable of preventing paper from entering to a nip between a duplex drive roller and an idle roller incorrectly for solving the above-mentioned problem.
  • According to the claimed invention, the paper-feeding mechanism utilized for an image-forming device includes a duplex drive roller disposed on a terminal end of a feeding path of the image-forming device for feeding paper and on a side of an output tray, a first idle roller for conveying the paper back to the output tray with the duplex drive roller after a single side of the paper is printed, a second idle roller for conveying the paper back to the output tray with the duplex drive roller after double sides of the paper are printed, and a stop means installed between the terminal end of the feeding path and the output tray for switching to a shut position to stop the paper when the paper is driven back to the feeding path and for switching to an open position not to stop the paper when the paper is driven to the output tray after the double sides of the paper are printed.
  • These and other objectives of the present invention will no doubt become obvious to those of ordinary skill in the art after reading the following detailed description of the preferred embodiment that is illustrated in the various figures and drawings.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1 is a diagram of conveying paper to an output tray in a duplex feeding mode in the prior art.
  • FIG. 2 is a diagram of conveying back the paper in the duplex feeding mode in the prior art.
  • FIG. 3 is a perspective drawing of a paper-feeding mechanism utilized for an image-forming device according to a preferred embodiment of the present invention.
  • FIG. 4 is a diagram of paper conveying to an output tray after a single side of the paper is printed in a duplex feeding mode according to the preferred embodiment of the present invention.
  • FIG. 5 is a diagram of the paper conveying back for printing the other side of the paper in the duplex feeding mode according to the preferred embodiment of the present invention.
  • FIG. 6 is a diagram of the paper conveying out of a feeding path after printing double sides of the paper in the duplex feeding mode according to the preferred embodiment of the present invention.
  • FIG. 7 is a diagram of the paper conveying to the output tray after printing the double sides of the paper in the duplex feeding mode according to the preferred embodiment of the present invention.
  • FIG. 8 is a perspective drawing of a paper-feeding mechanism utilized for an image-forming device according to another preferred embodiment of the present invention.
    •  DETAILED DESCRIPTION
  • Please refer to FIG. 3 to FIG. 7. FIG. 3 is a perspective drawing of a paper-feeding mechanism utilized for an image-forming device according to a preferred embodiment of the present invention. FIG. 4 is a diagram of paper conveying to an output tray 5 after a single side of the paper is printed in a duplex feeding mode according to the preferred embodiment of the present invention. FIG. 5 is a diagram of the paper conveying back for printing the other side of the paper in the duplex feeding mode according to the preferred embodiment of the present invention. FIG. 6 is a diagram of the paper conveying out of a feeding path after printing double sides of the paper in the duplex feeding mode according to the preferred embodiment of the present invention. FIG. 7 is a diagram of the paper conveying to the output tray 5 after printing the double sides of the paper in the duplex feeding mode according to the preferred embodiment of the present invention. The paper-feeding mechanism is utilized for the image-forming device with the duplex feeding function, such a scanner, a multifunction product, a printer with a duplex printing function, and so on. The paper-feeding mechanism is disposed on a terminal end of the feeding path of the image-forming device. Please refer to FIG. 3, a drive shaft 7 is connected to a frame on lateral sides of the terminal end of the feeding path of the image-forming device and is driven by a motor (not shown in figures). A duplex drive roller 22 is installed on the drive shaft 7. A first idle roller 33 and a second idle roller 44 are disposed on an upper side and a bottom side of the duplex drive roller 22 respectively, and the first idle roller 33 and the second idle roller 44 cooperate with the duplex drive roller 22. When the duplex drive roller 22 rotates forward, the duplex drive roller 22 and the first idle roller 33 drive the paper with a single printed side to a print an image-forming section. When the duplex drive roller 22 rotates backward, the duplex drive roller 22 and the first idle roller 33 drive the paper with the single printed side to the feeding path again.
  • A hole 61 is disposed below the second idle roller 44 on the frame nearby the terminal end of the feeding path. There are two stop means 6 disposed on both sides of the second idle roller 44 and between the terminal end of the feeding path and the output tray 5. The stop means 6 is connected to a shaft 62. The stop means 6 includes a connecting part 68 fixed on the shaft 62, a top part 66, and an arched part 69 formed between the connecting part 68 and the top part 66. An arched cavity of the arched part 69 is disposed opposite to an exit direction of the paper. The stop means 6 can be paired to dispose preferredly.
  • The shaft 62 connected to the stop means 6 is pivoted inside the hole 61 in a rotatable manner. When the paper is not conveyed from the nip between the duplex drive roller 22 and the second idle roller 44, the stop means 6 is switched to a shut position. When the paper is conveyed from the nip between the duplex drive roller 22 and the second idle roller 44, the stop means 6 rotates around the shaft 62 to be switched from the shut position to an open position so as to convey the paper to the output tray 5.
  • Please refer to FIG. 3. A torsional spring 63 is sheathed on the shaft 62 for turning the stop means 6 from the open position to the shut position. The torsional spring 63 includes a fixing part 631 wedged inside a cavity 641 of a casing 64, and a pushing part 632 contacting against a face neighboring to the output tray 5 of the stop means 6. When the paper passes the nip between the duplex drive roller 22 and the second idle roller 44, the leading edge of the paper pushes the stop means 6 from the shut position to the open position so as to convey the paper to the output tray 5. At this time, the pushing part 632 of the torsional spring 63 is pressed down. After the paper has been conveyed to the output tray 5 completely, the restoring force of the torsional spring 63 drives the pushing part 632 to an original position so that the stop means 6 restores to the shut position.
  • There is frictional force between paper S and the paper stack 13 on the output tray 5 because the paper S contacts with the paper stack 13 so that it is possible that the frictional force draws the paper S to the nip between the duplex drive roller 22 and the second idle roller 44 incorrectly resulting in a paper jam. Please refer to FIG. 4. The duplex drive roller 22 and the first idle roller 33 drive the paper with one printed side along the feeding path (not shown in figures) to the output tray 5 in a duplex feeding mode. The leading edge of the paper S falls on the paper stack 13 but the paper S has not been conveyed to the output tray 5 completely after the paper S moves at a certain distance. For printing the other side of the paper S, the duplex drive roller 22 rotates reversely and drives the paper S back to the feeding path with the first idle roller 33. At this time, the previous leading edge converts into a trailing edge of the paper S. It is possible that the frictional force between the paper S and the paper stack 13 draws the paper S to the nip between the duplex drive roller 22 and the second idle roller 44 incorrectly.
  • Please refer to FIG. 5. The stop means 6 between the terminal end of the feeding path and the output tray 5 is located in the shut position and in front of the nip between the duplex drive roller 22 and the second idle roller 44. The leading edge of the paper S drawn to the nip between the duplex drive roller 22 and the second idle roller 44 incorrectly will be blocked by the stop means 6 and can not enter to the nip between the duplex drive roller 22 and the second idle roller 44 for preventing the paper jam.
  • Please refer to FIG. 6. After the double sides of the paper S have been printed, the duplex drive roller 22 and the second idle roller 44 drive the paper S to the output tray 5. When the paper S passes the nip between the duplex drive roller 22 and the second idle roller 44, the leading edge of the paper S pushes the stop means 6 from the shut position to the open position so as to convey the paper S to the output tray 5 smoothly. At this time, the pushing part 632 of the torsional spring 63 is pressed down by the stop means 6 in the open situation.
  • Please refer to FIG. 7. After the paper S has been conveyed to the output tray completely, the paper S can not apply force to the stop means 6 and the restoring force of the torsional spring 63 drives the pushing part 632 to the shut position so that the stop means 6 is capable of preventing the next paper from entering to the nip between the duplex drive roller 22 and the second idle roller 44 incorrectly.
  • Please refer to FIG. 8. FIG. 8 is a perspective drawing of a paper-feeding mechanism utilized for an image-forming device according to another preferred embodiment of the present invention. The difference between the above-mentioned embodiment and this embodiment is that a weight stack 67 is to substitute the torsional spring 63 as a restoring means. The weight stack 67 is connected to an end of the shaft 62. The weight stack 67 and the shaft 62 can be integrated preferredly. When the paper S passes the nip between the duplex drive roller 22 and the second idle roller 44, the leading edge of the paper S pushes the stop means 6 from the shut position to the open position so as to convey the paper S to the output tray 5 smoothly. At this time, the weight stack 67 connected to the end of the shaft 62 rises. After the paper S has been conveyed to the output tray 5 completely, the paper S can not apply force to the stop means 6 and the weight stack 67 goes down by the gravity thereof so that the stop means 6 restores to the shut position for preventing the next paper from entering to the nip between the duplex drive roller 22 and the second idle roller 44 incorrectly.
  • In contrast to the prior art, the present invention provides the restoring means to block the paper in front the nip between the duplex drive roller and the second idle roller when the frictional force between the paper and the paper stack draws the paper to the nip between the duplex drive roller and the second idle roller incorrectly so as to prevent the paper jam effectively.
  • Those skilled in the art will readily observe that numerous modifications and alterations of the device and method may be made while retaining the teachings of the invention.

Claims (9)

1. The paper-feeding mechanism utilized for an image-forming device comprising:
a duplex drive roller disposed on a terminal end of a feeding path of the image-forming device and disposed on a side of an output tray for feeding paper;
a first idle roller for conveying the paper to the output tray with the duplex drive roller after a single side of the paper is printed;
a second idle roller for conveying the paper to the output tray with the duplex drive roller after double sides of the paper are printed; and
a stop means installed between the terminal end of the feeding path and the output tray for switching to a shut position to stop the paper when the paper is driven back to the feeding path and for switching to an open position not to stop the paper when the paper is driven to the output tray after the double sides of the paper are printed.
2. The paper-feeding mechanism of claim 1 wherein the stop means is pivoted on the terminal end of the feeding path.
3. The paper-feeding mechanism of claim 1 further comprising a restoring means connected to the stop means for turning the stop means from the open position to the shut position.
4. The paper-feeding mechanism of claim 2 further comprising a shaft connected to the stop means and pivoted to the image-forming device for driving the stop means to rotate.
5. The paper-feeding mechanism of claim 3 wherein the restoring means is a torsional spring.
6. The paper-feeding mechanism of claim 5 wherein the torsional spring comprises:
a pushing part contacting against the stop means; and
a fixing part fixed on the image-forming device.
7. The paper-feeding mechanism of claim 3 wherein the restoring means is a weight stack.
8. The paper-feeding mechanism of claim 7 further comprising a shaft connected to the stop means and pivoted to the image-forming device for driving the stop means to rotate wherein the weight stack is connected to an end of the shaft.
9. The paper-feeding mechanism of claim 1 wherein the stop means comprises an arched part and an arched cavity of the arched part is disposed opposite to an exit direction of the paper.
US12/126,923 2008-01-24 2008-05-25 Paper-feeding mechanism Abandoned US20090189343A1 (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110228358A1 (en) * 2010-03-18 2011-09-22 Oki Data Corporation Medium transport apparatus, image scanning apparatus and image processing aparatus
US8641185B2 (en) 2010-10-21 2014-02-04 Seiko Epson Corporation Printing device and printing method
US20140205354A1 (en) * 2013-01-23 2014-07-24 Hewlett-Packard Development Company, L.P. Print media tray
EP2862829B1 (en) * 2013-09-30 2017-02-08 Canon Kabushiki Kaisha Image forming apparatus

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6316266B2 (en) * 2015-12-10 2018-04-25 キヤノン株式会社 Image forming apparatus

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5882130A (en) * 1995-03-22 1999-03-16 Seiko Epson Corporation Paper detection device for printer
US6446958B1 (en) * 1999-11-18 2002-09-10 Pitney Bowes Inc. Method and system for directing an item through the feed path of a folding apparatus
US20040178573A1 (en) * 2002-12-18 2004-09-16 Kenichi Hasegawa Sheet separating mechanism, fixing device, and image forming apparatus
US6983122B2 (en) * 2002-09-12 2006-01-03 Matsushita Electric Industrial Co., Ltd. Image forming apparatus

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5456382U (en) * 1977-09-28 1979-04-18
US5014976A (en) * 1990-04-04 1991-05-14 Xerox Corporation Exit roller shield for duplex printing

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5882130A (en) * 1995-03-22 1999-03-16 Seiko Epson Corporation Paper detection device for printer
US6446958B1 (en) * 1999-11-18 2002-09-10 Pitney Bowes Inc. Method and system for directing an item through the feed path of a folding apparatus
US6983122B2 (en) * 2002-09-12 2006-01-03 Matsushita Electric Industrial Co., Ltd. Image forming apparatus
US20040178573A1 (en) * 2002-12-18 2004-09-16 Kenichi Hasegawa Sheet separating mechanism, fixing device, and image forming apparatus

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110228358A1 (en) * 2010-03-18 2011-09-22 Oki Data Corporation Medium transport apparatus, image scanning apparatus and image processing aparatus
US8804214B2 (en) * 2010-03-18 2014-08-12 Oki Data Corporation Medium transport apparatus, image scanning apparatus and image processing apparatus
US8641185B2 (en) 2010-10-21 2014-02-04 Seiko Epson Corporation Printing device and printing method
US20140205354A1 (en) * 2013-01-23 2014-07-24 Hewlett-Packard Development Company, L.P. Print media tray
US8929798B2 (en) * 2013-01-23 2015-01-06 Hewlett-Packard Development Company, L.P. Print media tray
EP2862829B1 (en) * 2013-09-30 2017-02-08 Canon Kabushiki Kaisha Image forming apparatus

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