US20040207145A1 - Paper-feeding apparatus of an image forming apparatus - Google Patents

Paper-feeding apparatus of an image forming apparatus Download PDF

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Publication number
US20040207145A1
US20040207145A1 US10/791,757 US79175704A US2004207145A1 US 20040207145 A1 US20040207145 A1 US 20040207145A1 US 79175704 A US79175704 A US 79175704A US 2004207145 A1 US2004207145 A1 US 2004207145A1
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United States
Prior art keywords
paper
roller
pickup
drive roller
gear
Prior art date
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Abandoned
Application number
US10/791,757
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English (en)
Inventor
Deuk-hwan Chang
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.)
S Printing Solution Co Ltd
Original Assignee
Samsung Electronics Co Ltd
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 Samsung Electronics Co Ltd filed Critical Samsung Electronics Co Ltd
Assigned to SAMSUNG ELECTRONICS CO., LTD. reassignment SAMSUNG ELECTRONICS CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CHANG, DEUK-HWAN
Publication of US20040207145A1 publication Critical patent/US20040207145A1/en
Assigned to S-PRINTING SOLUTION CO., LTD. reassignment S-PRINTING SOLUTION CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SAMSUNG ELECTRONICS CO., LTD
Abandoned legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J11/00—Devices or arrangements  of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
    • 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
    • B65H3/02—Separating articles from piles using friction forces between articles and separator
    • B65H3/06—Rollers or like rotary separators
    • B65H3/0669—Driving devices therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H1/00—Supports or magazines for piles from which articles are to be separated
    • B65H1/26—Supports or magazines for piles from which articles are to be separated with auxiliary supports to facilitate introduction or renewal of the pile
    • B65H1/266—Support fully or partially removable from the handling machine, e.g. cassette, drawer
    • 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
    • B65H3/02—Separating articles from piles using friction forces between articles and separator
    • B65H3/06—Rollers or like rotary separators
    • B65H3/0623—Rollers or like rotary separators acting at least during a part of each separation cycle on the articles in a direction opposite to the final separating direction
    • 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
    • B65H2403/40—Toothed gearings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2513/00—Dynamic entities; Timing aspects
    • B65H2513/50—Timing
    • B65H2513/51—Sequence of process

Definitions

  • the present invention relates to a paper-feeding apparatus of an image forming apparatus, such as a copier, a printer, and a fax machine, and more particularly, to a paper-feeding apparatus of an image forming apparatus, which can prevent paper feed difficulties, for example, a paper jam, and a paper skew, and enhance paper-feeding accuracy of a feed roller, by removing a drag force generated by drive rollers during the line feeding of paper.
  • An image forming apparatus such as a copier, a printer, and a fax machine, generally has a paper-feeding apparatus feeding sheets of paper to an image forming unit.
  • such a paper-feeding apparatus 10 comprises a paper cassette 20 stacking sheets of paper P, a frame 11 receiving and detachably mounting the paper cassette 20 therein, a pickup unit 30 installed at the frame 11 with respect to the paper cassette 20 and picking up the sheets of paper P one by one, and a paper feeding unit 40 installed at the frame 11 with respect to the paper cassette 20 and conveying the sheet of paper P picked up by the pickup unit 30 .
  • the pickup unit 30 is composed of a pickup roller assembly 31 supported at the frame 11 to rotate with respect to a supporting shaft 35 , and a pickup roller driving motor 33 driving the pickup roller assembly 31 through a power transmitting gear train 37 .
  • the pickup roller assembly 31 is provided with: pickup rollers 34 picking up the sheets of paper P one by one; a first one-way power transmitter (not shown), such as a spring clutch transmitting only a rotating force in a paper pickup direction between the pickup rollers 34 and a pickup roller gear (not shown) positioned coaxially with the pickup rollers 34 ; and a housing 36 having one end supported on a pickup roller shaft 34 a and an other end rotatably fixed on the supporting shaft 35 , to enable the pickup rollers 34 to contact the sheets of paper P with a predetermined pressure, by a weight thereof.
  • a first one-way power transmitter such as a spring clutch transmitting only a rotating force in a paper pickup direction between the pickup rollers 34 and a pickup roller gear (not shown) positioned coaxially with the pickup rollers 34
  • a housing 36 having one end supported on a pickup roller shaft 34 a and an other end rotatably fixed on the supporting shaft 35 , to enable the pickup rollers 34 to contact the sheets of paper P with a pre
  • the paper feeding unit 40 is provided with a drive roller 41 and a drive backup roller 42 conveying the sheet of paper P picked up by the pickup rollers 34 , and a feed roller (not shown) feeding the sheet of paper P conveyed by the drive and the drive backup rollers 41 , 42 to an image forming unit (not shown).
  • the drive roller 41 which is connected with the pickup roller driving motor 33 through a drive roller gear train (not shown) having a second one-way power transmitter, such as a spring clutch, is driven in the paper pickup direction during the pickup of paper, and idles during the line feeding of paper.
  • a second one-way power transmitter such as a spring clutch
  • the pickup rollers 34 are rotated in the clockwise direction by the pickup roller assembly 31 of the pickup unit 30 , which is connected to the pickup roller driving motor 33 through the power transmitting gear train 37 .
  • the pickup rollers 34 contact and pick up the sheets of paper P stacked in the paper cassette 20 sheet by sheet. At this time, among the sheets of paper P, only an uppermost sheet of paper P is conveyed toward the drive and the drive backup rollers 41 , 42 by a rotating force in the clockwise direction of the pickup rollers 34 , and a friction resistance of friction bucklers or dams 39 installed in the paper cassette 20 .
  • the sheet of paper P is conveyed to the feed roller and a feed backup roller by the drive roller 41 and drive backup roller 42 , connected to the pickup roller driving motor 33 through the drive roller gear train.
  • a controller (not shown) stops the pickup rollers 34 after a predetermined time elapses, that is, after a leading end of the sheet of paper P is curled and aligned by a nip between the feed and the feed backup rollers. Then, the controller drives a feed roller driving motor (not shown) to drive the feed roller.
  • the pickup rollers 34 and the drive roller 41 are subjected to the rotating force in the clockwise direction by the sheet of paper P, but are idled, respectively, by the first one-way power transmitter of the pickup roller assembly 31 and the second one-way power transmitter of the drive roller gear train.
  • the sheet of paper P is fed to the image forming unit by the feed roller, printed at the image forming unit, and then discharged.
  • the pickup roller assembly 31 and the drive roller gear train have the first and second one-way power transmitters respectively, when the feed roller is driven by the feed roller driving motor to feed the sheet of paper P after the pickup of paper, it is subjected to a drag force corresponding to a force of idling the pickup rollers 34 and the drive roller 41 , respectively against the first one-way power transmitters of the pickup roller assembly 31 and the second one-way power transmitters of the drive roller gear train, as well as a weight of the pickup roller assembly 31 and a pressure between the drive and the drive backup rollers 41 , 42 which are acting on the sheet of paper P.
  • the drag force acting on the feed roller not only reduces a paper-feeding accuracy of the feed roller, but also, in the worst case, may cause the sheet of paper P to be skewed or jammed.
  • a paper-feeding apparatus of an image forming apparatus having first and second drive roller shafts, and a paper cassette
  • the paper-feeding apparatus including: a first drive roller, rotatably disposed on the first drive roller shaft; a pickup roller assembly, rotatably disposed, at a first end thereof, on the first drive roller shaft; a pickup roller, rotatably disposed at a second end of the pickup roller assembly to selectively move a sheet of paper in the paper cassette in a first direction, the pickup roller being disposed in a second direction, opposite the first direction, with respect to the first drive roller; a second drive roller, rotatably disposed on the second drive roller shaft, to press the sheet of paper with a first predetermined pressure against the first drive roller; and a drive roller power transmitter transmitting a driving force to the first and second drive rollers and the pickup roller during a paper pickup mode, and transmitting the driving force only to the first and second drive rollers during a line
  • a paper-feeding apparatus of an image forming apparatus including: a first drive roller; a pickup roller; a second drive roller; a swing gear part selectively transmitting a driving force to one of the first drive roller and the second drive roller, and a one-way power transmitting part disposed coaxially with the first drive roller, transmitting the driving force to the pickup roller only when the first drive roller is rotated in a first rotational direction.
  • FIG. 1 is a perspective view of a conventional paper-feeding apparatus of an image forming apparatus
  • FIG. 2 is a side elevation view of the paper-feeding apparatus of FIG. 1;
  • FIG. 3 is a schematic side elevation view of a paper-feeding apparatus of an image forming apparatus according to an embodiment of the present invention
  • FIG. 4 is a partial top plan view illustrating the connection relation among a pickup roller assembly, a one-way power transmitting part, and a drive roller part of the paper-feeding apparatus of FIG. 3;
  • FIG. 5 is a perspective view illustrating a modified example of a pickup roller assembly lifter of a paper-feeding apparatus according to a second embodiment of the present invention.
  • FIGS. 6A and 6B are side elevation views illustrating the operation of the pickup roller assembly lifter of the paper-feeding apparatus of FIG. 5.
  • FIG. 3 there is illustrated a paper-feeding apparatus 100 of an image forming apparatus of the present invention.
  • the paper-feeding apparatus 100 of the present invention comprises a paper cassette 120 stacking sheets of paper P, a frame (not shown) receiving and detachably mounting the paper cassette 120 , a pickup unit 130 installed at the frame with respect to the paper cassette 120 and picking up the sheets of paper P sheet by sheet, and a paper feeding unit 140 installed at the frame and feeding the sheet of paper P picked up by the pickup unit 130 .
  • a leading end (that is, a left side of the drawing) of the paper cassette 120 are installed a plurality of friction bucklers 128 to pick up and feed one sheet of paper P at a time during the pickup of paper.
  • the pickup unit 130 comprises: a pickup roller assembly 131 fixed rotatably with respect to a first drive roller shaft 142 a of a drive roller part 141 , which is fixed at the frame to rotate in association with a driving motor ( 155 to be described later); and a pickup roller assembly lifter 150 , selectively contacting and separating pickup rollers 134 , 134 ′ of the pickup roller assembly 131 , with and from the sheets of paper P, according to a rotating direction of the first drive roller shaft 142 a , to contact the pickup roller 134 , 134 ′ with the sheets of paper P during the pickup of paper.
  • the pickup roller assembly 131 comprises: two pickup rollers 134 , 134 ′ rotatably fixed on a pickup roller shaft 134 a to pickup the sheets of paper P one by one; a pickup driving gear 139 positioned on the first drive roller shaft 142 a to be driven by the driving motor 155 ; a pickup roller gear 135 positioned coaxially with the pickup rollers 134 , 134 ′ on the pickup roller shaft 134 a ; first, second, and third idle pickup gears 136 , 137 , 138 disposed between the pickup driving gear 139 and the pickup roller gear 135 , and fixed respectively on first, second, and third idle pickup shafts 136 a , 137 a , 138 a , to transmit a driving power of the driving motor 155 from the pickup driving gear 139 to the pickup roller gear 135 ; and a housing 133 receiving the gears 135 , 136 , 137 , 138 , 139 , and supporting the respective shafts 134 a
  • the first drive roller shaft 142 a is disposed such that a vertical plane extended vertically at a center thereof is positioned downstream in a paper pickup path, as compared with a vertical plane of the pickup roller shaft 134 a (to the left of the pickup roller shaft 134 a in FIG. 3).
  • the pickup roller assembly lifter 150 comprises a first elastic spring installed on the first drive roller shaft 142 a with respective ends supported at a first supporting projection (not shown) positioned at the frame, and a second supporting projection 133 a positioned at the housing 133 of the pickup roller assembly 131 .
  • the first elastic spring of the pickup roller assembly lifter 150 is compressed by the gearing force of the first drive roller gear 143 to rotate the pickup roller assembly 131 into a descent position (a solid line of FIG. 3), about the first drive roller shaft 142 a , when the first drive roller gear 143 is subjected to a force of rotating in a clockwise direction by the driving power of the driving motor 155 .
  • the first drive roller gear is not subject to the force of rotating in the clockwise direction by the driving motor 155
  • stored energy of the compressed first elastic spring subjects the pickup roller assembly 131 to another force of rotation about the first drive roller shaft 142 a , and restores the pickup roller assembly 131 into an ascent position (a dotted line of FIG. 3).
  • the pickup rollers 134 and 134 ′ are in contact with the sheets of paper P with a first predetermined pressure, and in the ascent position, the pickup rollers 134 and 134 ′ are separated from the sheets of paper P.
  • the paper feeding unit 140 comprises the drive roller part 141 to convey the sheet of paper P picked up by the pickup roller assembly 131 , a feed roller part 146 to feed the sheet of paper P to an image forming unit (not shown), a discharging roller part 165 to discharge the sheet of paper P printed at the image forming unit to the outside, and the driving motor 155 to drive the drive roller part 141 , the feed roller part 146 and the discharging roller part 165 .
  • the drive roller part 141 comprises two first drive rollers 142 and 142 ′ supported rotatably on the first drive roller shaft 142 a fixed rotably at the frame, downstream in the paper pickup direction of the pickup rollers 134 , 134 ′, and two second drive rollers 144 and 144 ′ fixed on a second drive roller shaft 144 a , to press the sheet of paper P with a second predetermined pressure against the first drive rollers 142 and 142 ′.
  • the first drive roller gear 143 and a second drive roller gear 145 are coaxially fixed with the first and the second drive rollers 142 , 142 ′; 144 , 144 ′, respectively.
  • the feed roller part 146 comprises: a feed roller gear 148 positioned on a feed roller shaft 147 a to rotate in association with first and second power transmitting gears 156 and 157 connected with a motor shaft 155 a of the driving motor 155 ; a feed roller 147 positioned coaxially with the feed roller gear 148 on the feed roller shaft 147 a ; and a friction roller 149 rotatably disposed on a friction roller shaft 149 a , pressing the sheet of paper P with a third predetermined pressure against the feed roller 147 , to convey the sheet of paper P.
  • the friction roller 149 includes a friction roller holder 158 supported at the frame to exert a predetermined pressing force on the friction roller 149 by an elastic spring (not shown).
  • a drive roller power transmitter 160 ; 170 , 170 ′ is disposed between the drive roller part 141 and the feed roller part 146 , to transmit the driving power of the driving motor 155 from the feed roller gear 148 of the feed roller part 146 to the first drive roller 143 of the drive roller part 141 .
  • This drives the pickup rollers 134 , 134 ′ and the first and the second drive rollers 142 , 142 ′; 144 , 144 ′, respectively, in a paper pickup direction and a paper feeding direction (arrows of solid line in FIG.
  • the drive roller power transmitter 160 ; 170 , 170 ′ comprises: a swing gear part 160 disposed among the first and the second drive roller gears 143 and 145 of the drive roller part 141 , and the feed roller gear 148 connected with the driving motor 155 a through the first and the second power transmitting gears 156 and 157 to convey the sheet of paper P, and interconnecting between the feed roller gear 148 and the first drive roller gear 143 or between the feed roller gear 148 and the second drive roller gear 145 , according to a rotating direction of the feed roller gear 148 .
  • the swing gear part 160 comprises: first and second idle swing gears 162 and 163 , arranged to respectively engage with the first and the second drive roller gears 143 and 145 ; and a swing gear 161 arranged to engage with the feed roller gear 148 , formed coaxially with the feed roller 147 on the feed roller shaft 147 a , and disposed to selectively connect with the first and the second idle swing gear 162 and 163 , according to the rotating direction of the feed roller gear 148 .
  • a shaft 161 a of the swing gear 161 is rotatably fixed at one end of a swing lever (not shown) hinged on the frame at the other end thereof, so that the swing gear 161 can be selectively connected with the first and the second idle swing gear 162 and 163 , according to the rotating direction of the feed roller gear 148 .
  • the drive roller power transmitter 160 ; 170 , 170 ′ further comprises a one-way power transmitting part 170 , 170 ′ disposed on the first drive roller shaft 142 a.
  • the one-way power transmitting part 170 , 170 ′ comprises: two spring clutches 170 and 170 ′, having respective roller hubs 171 and 171 ′ of the respective first drive rollers 142 and 142 ′ rotatably disposed on the first drive roller shaft 142 a ; a-bushing hubs 173 a and 173 a ′ of respective bushings 173 and 173 ′ fixed on the first drive roller shaft 142 a ; and clutch springs 175 and 175 ′ coiled around the respective roller hubs 171 and 171 ′ and the respective bushing hubs 173 a and 173 a ′, to generate a sliding friction force therebetween.
  • the clutch springs 175 and 175 ′ come in tight contact with outer circumferences of the roller and bushing hubs 171 , 171 ′; 173 a , 173 a ′ while respective inner diameters of the clutch springs 175 and 175 ′ get smaller due to a sliding friction force with the roller and bushing hubs 171 , 171 ′; 173 a , 173 a ′, so that a rotating force of the bushing hubs 173 and 173 ′ is transferred to the roller hubs 171 and 171 ′ of the first drive rollers 142 and 142 ′ nearby the bushing hubs 173 a , 173 a ′. Accordingly, the rotating force of the first drive roller gear 143 is transferred to the second drive rollers 144 and 144 ′ through the first drive rollers 142 and 142 ′.
  • the clutch springs 175 , 175 ′ are spaced from the outer circumferences of the roller and bushing hubs 171 , 171 ′; 173 a , 173 a ′ while the inner diameters of the clutch springs 175 and 175 ′ increase due to the sliding friction force with the roller and bushing hubs 171 , 171 ′; 173 a , 173 a ′, so that the first drive rollers 142 , 142 ′ idle. Accordingly, the rotating force of the first drive rollers 142 and 142 ′ is not transferred to the pickup driving gear 139 of the pickup roller assembly 131 .
  • the one-way power transmitting part is illustrated and explained as composed of the spring clutches 170 , 170 ′, but the present invention is not limited to this embodiment.
  • the one-way power transmitting part may comprise a one-way power transmitting apparatus such as a ratchet.
  • the discharging roller part 165 comprises a discharging roller 166 connected with the driving motor 155 through a discharging roller gear train (not shown) to discharge the sheet of paper P printed at the image forming unit, and a discharging backup roller 167 disposed to press the discharging roller 166 with a fourth predetermined pressure.
  • the paper-feeding apparatus 100 further comprises a second drive roller releaser 180 to separate the second drive rollers 144 , 144 ′ from the first drive rollers 142 , 142 ′ when a sheet of paper P is jammed.
  • the second drive roller releaser 180 comprises: a releasing lever 181 having a first end 181 a supported rotatably at the frame, and a second end 181 b rotatably supporting the second drive roller shaft 144 a , and movable between a releasing position (a dotted line of FIG. 3) and an engaging position (a solid line of FIG. 3); and a restoring part 183 restoring the releasing lever 181 into the engaging position after a paper jam is removed.
  • the releasing lever 181 moves the second drive rollers 144 and 144 ′ to separate from first drive rollers 142 and 142 ′, and in the engaging position, the releasing lever 181 moves the second drive rollers 144 and 144 ′ to engage with the first drive rollers 142 and 142 ′ with the second predetermined pressure.
  • the restoring part 183 comprises a second elastic spring installed on a fixing axis 184 rotatably supported at a corresponding support (not shown) of the frame, and having ends supported respectively on a first fixing projection 185 of the releasing lever 181 , and a second fixing projection (not shown) of the frame.
  • the second elastic spring of the restoring part 183 has an elastic force that is capable of pressing the second drive rollers 144 and 144 ′ with the second predetermined pressure against the first drive rollers 142 and 142 ′.
  • the driving motor 155 rotates in one direction, for example, the clockwise direction (an arrow of solid line in FIG. 3 ) to pick up a sheet of paper P, and thereby the feed roller gear 148 , connected to the shaft 155 a of the driving motor 155 through the first and the second power transmitting gears 156 and 157 , rotates in an counter-clockwise direction.
  • the first drive rollers 142 and 142 ′ As the first drive roller gear 143 rotates in the clockwise direction, the first drive rollers 142 and 142 ′, positioned coaxially with the first drive roller gear 143 on the first drive roller shaft 142 a , also rotates in the clockwise direction through the spring clutches 170 and 170 ′ of the one-way power transmitting part.
  • the second drive rollers 144 and 144 ′ which are in a predetermined pressure contact with the first drive rollers 142 and 142 ′ rotating in the clockwise direction as described above with the second predetermined pressure, rotate in the counter-clockwise direction.
  • the pickup roller assembly 131 is moved from the ascent position (a dotted line of FIG. 3), where the pickup rollers 134 and 134 ′ are separated from the sheets of paper P, to the descent position (a solid line of FIG. 3), where the pickup rollers 134 and 134 ′ are in contact with the sheets of paper P with the first predetermined pressure.
  • the pickup roller assembly 131 Moving from the ascent position to the descent position, the pickup roller assembly 131 moves against the first elastic spring of the pickup roller assembly 131 by the weight of the pickup roller assembly 131 and the gearing force of the first drive roller gear 143 , and at the same time, the pickup driving gear 139 , positioned coaxially with the first drive roller gear 143 on the first drive roller shaft 142 a , rotates in the clockwise direction.
  • the pickup roller gear 135 connected with the pickup driving gear 139 through the first, second, and third idle gears 136 , 137 and 138 , and the pickup rollers 134 and 134 ′, which are positioned coaxially with the pickup roller gear 135 on the pickup roller shaft 134 a , rotate in the clockwise direction.
  • the pickup rollers 134 and 134 ′ contact and pick up the sheets of paper P stacked in the paper cassette 120 .
  • a controller (not shown) stops rotation of the pickup rollers 13 and 134 ′ after a predetermined time elapses, that is, after a leading end of the sheet of paper P is curled and aligned by a nip between the feed roller 147 and the friction roller 149 .
  • the controller then drives the driving motor 155 in the other direction, that is, the counter-clockwise direction (an arrow of dotted line in FIG. 3) to drive the feed roller 147 and the discharging roller 166 .
  • the feed roller gear 148 connected to the shaft 155 a of the driving motor 155 through the first and the second transmitting gears 156 and 157 , rotates in the clockwise direction, and the friction roller 149 rotates in the counter-clockwise direction to feed the sheet of paper P.
  • the second drive roller gear 145 rotates in the counter-clockwise direction
  • the second drive rollers 144 and 144 ′ positioned coaxially with the second drive roller gear 145 on the second drive roller shaft 144 a , also rotate in the counter-clockwise direction, and thereby the first drive rollers 142 and 142 ′ which contact the second drive rollers 144 and 144 ′ with the second predetermined pressure, rotate in the clockwise direction.
  • the clutch springs 175 and 175 ′ are spaced from the outer circumferences of the roller and bushing hubs 171 , 171 ′; 173 a , 173 a ′ while the inner diameters of the clutch springs 175 and 175 ′; increase due to the sliding friction force with the roller and bushing hubs 171 , 171 ′; 173 a , 173 a ′, so that the first drive rollers 142 and 142 ′ idle.
  • the sheet of paper P is moved to the image forming unit without being subjected to any interruption, for example, no drag force is caused by the first and the second drive rollers 142 , 142 ′; 144 , 144 ′ and the pickup rollers 134 , 134 ′.
  • the paper feeding accuracy of the feed roller 147 is improved and paper skewing or paper jamming is prevented.
  • the sheet of paper P is printed at the image forming unit, and then discharged by the discharging roller 146 and the discharging backup roller 167 , which are connected with the driving motor 155 through the discharging roller gear train.
  • FIGS. 5 through 6B a modified pickup roller assembly lifter 150 ′ of the paper-feeding apparatus 100 is illustrated according to a second embodiment of the present invention.
  • the pickup roller assembly lifter 150 ′ is installed with respect to the pickup roller assembly 131 and the paper cassette 120 .
  • the pickup roller assembly lifter 150 ′ brings the pickup rollers 134 and 134 ′ of the pickup roller assembly 131 into contact, with a fifth predetermined pressure with the sheets of paper P when the paper cassette 120 is mounted in the frame.
  • the pickup roller assembly lifter 150 ′ also separates the pickup feed rollers 134 and 134 ′ from the sheets of paper P when the paper cassette 120 is detached from the frame.
  • the pickup roller assembly lifter 150 ′ comprises a lift guiding groove portion 125 positioned at a top end of a side wall 123 of the paper cassette 120 , a lifting shaft 151 having a projecting guide 153 at a first end thereof and supported rotatably on the frame to be raised and lowered by the lift guiding groove portion 125 , a link member 154 installed between a second end of the lifting shaft 151 and the housing 133 of the pickup roller assembly 131 to move the pickup rollers 134 , 134 ′ into a descent position (FIG. 6B) contacting the sheets of paper P and an ascent position (FIG.
  • the lift guiding groove portion 125 of the paper cassette 120 , and the projecting guide 153 of the lifting shaft 151 , are respectively provided with a locking groove 125 a and a locking projection 153 a that engage each other when the paper cassette 120 is completely mounted in the frame.
  • the link member 154 has a first link 154 a having a first end fixed at the second end of the lifting shaft 151 , and a second link 154 b having first and second ends supported rotatably at a second end of the first link 154 a and the housing 133 of pickup roller assembly 131 , respectively.
  • the pulling part 152 comprises an extension spring having one end fixed at a third fixing projection 133 b of the housing 133 of the pickup roller assembly 131 , and the other end fixed at a fourth fixing projection (not shown) positioned at the frame.
  • the extension spring of the pulling part 152 is constructed to be fixed between the second link 154 b of the link member 154 and the frame.
  • the paper cassette 120 in which sheets of paper P are stacked first moves in a direction of arrow A to be mounted in the frame.
  • the first link 154 a connected to the lifting shaft 151 rotates in the clockwise direction about the lifting shaft 151 to pull the second link 154 b downwardly, and thereby the housing 133 of the pickup roller assembly 131 hinged with the second link 154 b descends downwardly against the extension spring of the pulling part 152 .
  • the paper cassette 120 moves in a direction of arrow B to be detached from the frame, as is shown in FIG. 6B.
  • the paper-feeding apparatus 10 of the image forming apparatus can prevent paper feed troubles such as paper jams and paper skewing, and improve the paper-feeding accuracy of the feed roller 147 , by removing the drag force generated by the first and the second drive rollers 142 and 144 during the line feeding of the paper P.
  • the paper-feeding apparatus 10 can improve the pickup efficiency of the pickup rollers 134 and 134 ′, by directing the vector of the force acted on the sheets of paper P by the pickup roller assembly 131 , that is, its own weight and the gearing force of the pickup driving gear 139 or the force of the projecting guide 153 of the pickup roller assembly lifter 150 ′, in the same direction as that of the rotating force acting on the sheets of paper P by the pickup rollers 134 and 134 ′ during the pickup of paper.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
US10/791,757 2003-04-15 2004-03-04 Paper-feeding apparatus of an image forming apparatus Abandoned US20040207145A1 (en)

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KR2003-23790 2003-04-15
KR10-2003-0023790A KR100513753B1 (ko) 2003-04-15 2003-04-15 사무기기의 급지장치

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Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050017432A1 (en) * 2003-07-03 2005-01-27 Masaaki Mitsuhashi Paper feeding apparatus
US20060071398A1 (en) * 2004-08-10 2006-04-06 Bdt Ag. Device for separation and feeding of sheets of a recording carrier
US20060071399A1 (en) * 2004-09-15 2006-04-06 Brother Kogyo Kabushiki Kaisha Image recording apparatus
US20070002117A1 (en) * 2005-06-30 2007-01-04 Katsuhiko Miki Image forming apparatus
US20070001373A1 (en) * 2005-06-30 2007-01-04 Eng-Leong Soo Media input system
US20070075477A1 (en) * 2005-09-30 2007-04-05 Brother Kogyo Kabushiki Kaisha Sheet Feeder Including A Plurality Of Paper Cassettes
US20070102866A1 (en) * 2005-09-27 2007-05-10 Brother Kogyo Kabushiki Kaisha Feeder for objects to be conveyed, and image recording device having same
US20070126170A1 (en) * 2005-12-05 2007-06-07 Silverbrook Research Pty Ltd Printer having compact media pick-up device
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US10183821B2 (en) * 2017-02-07 2019-01-22 Kabushiki Kaisha Toshiba Paper feed apparatus and image forming apparatus
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US20070075477A1 (en) * 2005-09-30 2007-04-05 Brother Kogyo Kabushiki Kaisha Sheet Feeder Including A Plurality Of Paper Cassettes
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US8075089B2 (en) 2005-12-05 2011-12-13 Silverbrook Research Pty Ltd Method of assembling printhead capping mechanism
US20070126170A1 (en) * 2005-12-05 2007-06-07 Silverbrook Research Pty Ltd Printer having compact media pick-up device
US20100164168A1 (en) * 2005-12-05 2010-07-01 Silverbrook Research Pty Ltd Printer having geared media pick-up roller
US7758038B2 (en) * 2005-12-05 2010-07-20 Silverbrook Research Pty Ltd Printer having compact media pick-up device
US20100277545A1 (en) * 2005-12-05 2010-11-04 Silverbrook Research Pty Ltd Printer having disengageable media pick up
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US20070176351A1 (en) * 2006-02-02 2007-08-02 Masatoshi Izuchi Image Forming Apparatus Having Supporting Member That Supports Bottom Portion Of Feeding Tray
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US20070290430A1 (en) * 2006-06-16 2007-12-20 Primax Electronics Ltd. Sheet pick-up device
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US8235379B2 (en) * 2008-01-21 2012-08-07 Lg N-Sys Inc. Media separating apparatus of automatic media dispenser
EP3274181A4 (en) * 2015-07-31 2018-12-05 Hewlett-Packard Development Company, L.P. Stalling operation of imaging devices

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CN1537799A (zh) 2004-10-20
CN1307085C (zh) 2007-03-28

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