US20040207145A1 - Paper-feeding apparatus of an image forming apparatus - Google Patents
Paper-feeding apparatus of an image forming apparatus Download PDFInfo
- 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
- 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
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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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sheets, Magazines, And Separation Thereof (AREA)
Abstract
A paper-feeding apparatus of an image forming apparatus, having a driving motor, at least one first drive roller positioned downstream in a paper pickup direction of a pickup roller, at least one second drive roller disposed to press the sheet of paper with a predetermined pressure against the first drive roller, and a drive roller power transmitter transmitting a power of the driving motor to the first drive roller, to allow the pickup roller and the first and the second rollers to be respectively driven in the paper pickup direction and a paper feeding direction during the pickup of paper, and to transmit the power of the driving motor to the second drive roller, to allow only the first and the second rollers to be driven in the paper feeding direction during the line feeding of paper, and thus prevent paper feed troubles such as paper jamming and paper skewing.
Description
- This application claims the priority of Korean Patent Application No. 2003-23790, filed on Apr. 15, 2003, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference.
- 1. Field of the Invention
- 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.
- 2. Description of the Related Art
- 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.
- As is shown in FIGS. 1 and 2, such a paper-
feeding apparatus 10 comprises apaper cassette 20 stacking sheets of paper P, aframe 11 receiving and detachably mounting thepaper cassette 20 therein, apickup unit 30 installed at theframe 11 with respect to thepaper cassette 20 and picking up the sheets of paper P one by one, and apaper feeding unit 40 installed at theframe 11 with respect to thepaper cassette 20 and conveying the sheet of paper P picked up by thepickup unit 30. - The
pickup unit 30 is composed of apickup roller assembly 31 supported at theframe 11 to rotate with respect to a supportingshaft 35, and a pickuproller driving motor 33 driving thepickup roller assembly 31 through a power transmittinggear 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 thepickup rollers 34 and a pickup roller gear (not shown) positioned coaxially with thepickup rollers 34; and ahousing 36 having one end supported on apickup roller shaft 34 a and an other end rotatably fixed on the supportingshaft 35, to enable thepickup rollers 34 to contact the sheets of paper P with a predetermined pressure, by a weight thereof. - As is shown in FIG. 2, the
paper feeding unit 40 is provided with adrive roller 41 and adrive backup roller 42 conveying the sheet of paper P picked up by thepickup rollers 34, and a feed roller (not shown) feeding the sheet of paper P conveyed by the drive and thedrive backup rollers - The
drive roller 41, which is connected with the pickuproller 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. - The operation of the conventional paper-
feeding apparatus 10 constructed as above is described as follows. - Firstly, with a printing command, the
pickup rollers 34 are rotated in the clockwise direction by thepickup roller assembly 31 of thepickup unit 30, which is connected to the pickuproller driving motor 33 through the power transmittinggear train 37. - As a result, the
pickup rollers 34 contact and pick up the sheets of paper P stacked in thepaper 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 thedrive backup rollers pickup rollers 34, and a friction resistance of friction bucklers ordams 39 installed in thepaper cassette 20. - After that, the sheet of paper P is conveyed to the feed roller and a feed backup roller by the
drive roller 41 and drivebackup roller 42, connected to the pickuproller driving motor 33 through the drive roller gear train. - Subsequently, when the sheet of paper P operates a paper sensor (not shown) installed in the vicinity of the feed roller, 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. - At this time, the
pickup rollers 34 and thedrive 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 thepickup roller assembly 31 and the second one-way power transmitter of the drive roller gear train. - And then, 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.
- But in the conventional paper-
feeding apparatus 10, since thepickup 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 thepickup rollers 34 and thedrive roller 41, respectively against the first one-way power transmitters of thepickup roller assembly 31 and the second one-way power transmitters of the drive roller gear train, as well as a weight of thepickup roller assembly 31 and a pressure between the drive and thedrive backup rollers - 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.
- Also, in the conventional paper-
feeding apparatus 10, since a vector of force, acted on the sheet of paper P by the weight and the like of thepickup roller assembly 31, acts contrary to that of the rotating force acted on the sheet of paper P by thepickup rollers 34 during the pickup of paper, there is a problem that a rotating resultant force of thepickup rollers 34 during the pickup of paper is decreased, and thereby a paper pickup efficiency of thepickup rollers 34 is reduced. - If the paper pickup efficiency of the
pickup rollers 34 is reduced, difficulties, such as the sheet of paper P not being picked up, or the sheet of paper P being jammed by thepickup rollers 34, may occur. - It is one aspect of the present invention to provide a paper-feeding apparatus of an image forming apparatus, which is constructed not to have a drag force generated by drive rollers during line feeding of paper, thereby preventing paper feed troubles such as a paper jams and paper skewing, and improving a paper-feeding accuracy of a feed roller.
- It is another aspect of the present invention to provide a paper-feeding apparatus of an image forming apparatus, comprising a vector of force that acts on a sheet of paper by a pickup roller assembly to act in the same direction as a vector of a rotating force that acts on the sheet of paper by pickup rollers during the pickup of paper, thereby improving a pickup efficiency of the pickup roller.
- The foregoing and/or other aspects and advantages are realized by providing 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 feeding mode.
- The foregoing and/or other aspects and advantages are also realized by providing 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.
- Additional aspects and/or advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
- These and/or other aspects and advantages of the invention will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
- 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; and
- 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.
- Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout. The embodiments are described below to explain the present invention by referring to the figures.
- Referring to 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 apaper cassette 120 stacking sheets of paper P, a frame (not shown) receiving and detachably mounting thepaper cassette 120, apickup unit 130 installed at the frame with respect to thepaper cassette 120 and picking up the sheets of paper P sheet by sheet, and apaper feeding unit 140 installed at the frame and feeding the sheet of paper P picked up by thepickup unit 130. - At a leading end (that is, a left side of the drawing) of the
paper cassette 120 are installed a plurality offriction 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: apickup roller assembly 131 fixed rotatably with respect to a firstdrive roller shaft 142 a of adrive roller part 141, which is fixed at the frame to rotate in association with a driving motor (155 to be described later); and a pickuproller assembly lifter 150, selectively contacting and separatingpickup rollers pickup roller assembly 131, with and from the sheets of paper P, according to a rotating direction of the firstdrive roller shaft 142 a, to contact thepickup roller - The
pickup roller assembly 131 comprises: twopickup rollers pickup roller shaft 134 a to pickup the sheets of paper P one by one; apickup driving gear 139 positioned on the firstdrive roller shaft 142 a to be driven by thedriving motor 155; apickup roller gear 135 positioned coaxially with thepickup rollers pickup roller shaft 134 a; first, second, and thirdidle pickup gears pickup driving gear 139 and thepickup roller gear 135, and fixed respectively on first, second, and thirdidle pickup shafts driving motor 155 from thepickup driving gear 139 to thepickup roller gear 135; and ahousing 133 receiving thegears respective shafts - According to one aspect, to assure that a vector of force of the
pickup roller assembly 131 acts on the sheets of paper P, that is, its own weight and a gearing force of a firstdrive roller gear 143 to be described later, acts in the same direction as that of a rotating force of thepickup rollers 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 thepickup roller shaft 134 a (to the left of thepickup roller shaft 134 a in FIG. 3). - According to one aspect, the pickup
roller assembly lifter 150 comprises a first elastic spring installed on the firstdrive roller shaft 142 a with respective ends supported at a first supporting projection (not shown) positioned at the frame, and a second supportingprojection 133 a positioned at thehousing 133 of thepickup roller assembly 131. - The first elastic spring of the pickup
roller assembly lifter 150 is compressed by the gearing force of the firstdrive roller gear 143 to rotate thepickup roller assembly 131 into a descent position (a solid line of FIG. 3), about the firstdrive roller shaft 142 a, when the firstdrive roller gear 143 is subjected to a force of rotating in a clockwise direction by the driving power of thedriving motor 155. When the first drive roller gear is not subject to the force of rotating in the clockwise direction by the drivingmotor 155, stored energy of the compressed first elastic spring subjects thepickup roller assembly 131 to another force of rotation about the firstdrive roller shaft 142 a, and restores thepickup roller assembly 131 into an ascent position (a dotted line of FIG. 3). In the descent position, thepickup rollers pickup rollers - The
paper feeding unit 140 comprises thedrive roller part 141 to convey the sheet of paper P picked up by thepickup roller assembly 131, afeed roller part 146 to feed the sheet of paper P to an image forming unit (not shown), adischarging roller part 165 to discharge the sheet of paper P printed at the image forming unit to the outside, and thedriving motor 155 to drive thedrive roller part 141, thefeed roller part 146 and thedischarging roller part 165. - As is shown in FIG. 4, the
drive roller part 141 comprises twofirst drive rollers drive roller shaft 142 a fixed rotably at the frame, downstream in the paper pickup direction of thepickup rollers second drive rollers drive roller shaft 144 a, to press the sheet of paper P with a second predetermined pressure against thefirst drive rollers - On one end of the respective first and the second
drive roller shafts drive roller gear 143 and a second drive roller gear 145 (only shown in FIG. 3), each of which engages with a first or a secondidle swing gears 162 or 163 of a swing gear part 160 forming a drive roller power transmitter to be described later, are coaxially fixed with the first and thesecond drive rollers - The
feed roller part 146 comprises: afeed roller gear 148 positioned on afeed roller shaft 147 a to rotate in association with first and second power transmittinggears motor shaft 155 a of thedriving motor 155; afeed roller 147 positioned coaxially with thefeed roller gear 148 on thefeed roller shaft 147 a; and afriction roller 149 rotatably disposed on afriction roller shaft 149 a, pressing the sheet of paper P with a third predetermined pressure against thefeed roller 147, to convey the sheet of paper P. - The
friction roller 149 includes afriction roller holder 158 supported at the frame to exert a predetermined pressing force on thefriction roller 149 by an elastic spring (not shown). - A drive roller power transmitter160; 170, 170′, is disposed between the
drive roller part 141 and thefeed roller part 146, to transmit the driving power of thedriving motor 155 from thefeed roller gear 148 of thefeed roller part 146 to thefirst drive roller 143 of thedrive roller part 141. This drives thepickup rollers second drive rollers driving motor 155 from thefeed roller gear 148 of thefeed roller part 146 to thesecond drive roller 145 of thedrive roller part 141, thereby to allow only the first and thesecond drive rollers - The drive roller power transmitter160; 170, 170′ comprises: a swing gear part 160 disposed among the first and the second
drive roller gears drive roller part 141, and thefeed roller gear 148 connected with thedriving motor 155 a through the first and the second power transmittinggears feed roller gear 148 and the firstdrive roller gear 143 or between thefeed roller gear 148 and the seconddrive roller gear 145, according to a rotating direction of thefeed roller gear 148. - According to one aspect, the swing gear part160 comprises: first and second
idle swing gears 162 and 163, arranged to respectively engage with the first and the seconddrive roller gears swing gear 161 arranged to engage with thefeed roller gear 148, formed coaxially with thefeed roller 147 on thefeed roller shaft 147 a, and disposed to selectively connect with the first and the secondidle swing gear 162 and 163, according to the rotating direction of thefeed roller gear 148. - A
shaft 161 a of theswing 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 theswing gear 161 can be selectively connected with the first and the secondidle swing gear 162 and 163, according to the rotating direction of thefeed roller gear 148. - More specifically, as is shown in solid line arrows in FIG. 3, when the
feed roller gear 148 rotates in an counter-clockwise direction to pick up a sheet of paper P, theswing gear 161 is engaged with the firstidle swing gear 162 by the swing lever, whereas as shown in dotted line arrows in FIG. 3, when thefeed roller gear 148 is rotated in clockwise direction to feed the sheet of paper P, theswing gear 161 is engaged with the second idle swing gear 163 by the swing lever. - To transmit the driving power of the driving
motor 155, transmitted to the firstdrive roller gear 143 through theswing gear 161 and the firstidle swing gear 162, into thesecond drive rollers first drive rollers motor 155, transmitted to thefirst drive rollers swing gear 161, the second idle swing gear 163, the seconddrive roller gear 145, and thesecond drive rollers pickup driving gear 139 of thepickup roller assembly 131, thus idling thefirst drive rollers power transmitting part drive roller shaft 142 a. - According to one aspect, the one-way
power transmitting part spring clutches respective roller hubs first drive rollers drive roller shaft 142 a;a-bushing hubs respective bushings drive roller shaft 142 a; andclutch springs respective roller hubs respective bushing hubs - When the first
drive roller gear 143 fixed on the firstdrive roller shaft 142 a is rotated in one direction, for example, the clockwise direction, by theswing gear 161 and the firstidle swing gear 162 of the swing gear part 160, the clutch springs 175 and 175′ of thespring clutches bushing hubs clutch springs bushing hubs bushing hubs roller hubs first drive rollers bushing hubs drive roller gear 143 is transferred to thesecond drive rollers first drive rollers - On the contrary, when the
first drive rollers swing gear 161 and the second idle swing gear 163 of the swing gear part 160, the seconddrive roller gear 145 and thesecond drive rollers spring clutches bushing hubs clutch springs bushing hubs first drive rollers first drive rollers pickup driving gear 139 of thepickup roller assembly 131. - Here, it should be noted that in the present embodiment of the present invention, the one-way power transmitting part is illustrated and explained as composed of the
spring clutches - The discharging
roller part 165 comprises a dischargingroller 166 connected with the drivingmotor 155 through a discharging roller gear train (not shown) to discharge the sheet of paper P printed at the image forming unit, and a dischargingbackup roller 167 disposed to press the dischargingroller 166 with a fourth predetermined pressure. - Also, according to one aspect, the paper-feeding
apparatus 100 further comprises a seconddrive roller releaser 180 to separate thesecond drive rollers first drive rollers - The second
drive roller releaser 180 comprises: a releasinglever 181 having afirst end 181 a supported rotatably at the frame, and a second end 181 b rotatably supporting the seconddrive 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 restoringpart 183 restoring the releasinglever 181 into the engaging position after a paper jam is removed. In releasing position, the releasinglever 181 moves thesecond drive rollers first drive rollers lever 181 moves thesecond drive rollers first drive rollers - The restoring
part 183 comprises a second elastic spring installed on a fixingaxis 184 rotatably supported at a corresponding support (not shown) of the frame, and having ends supported respectively on afirst fixing projection 185 of the releasinglever 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 thesecond drive rollers first drive rollers - The operation of the paper-feeding
apparatus 100 of the image forming apparatus according to the present invention constructed as above will be described in detail with reference to FIGS. 3 and 4. - Firstly, when the image forming apparatus of the present invention begins operation with a printing command after mounting the
paper cassette 120 in the frame, the drivingmotor 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 thefeed roller gear 148, connected to theshaft 155 a of the drivingmotor 155 through the first and the second power transmitting gears 156 and 157, rotates in an counter-clockwise direction. - As the
feed roller gear 148 rotates in the counter-clockwise direction, theswing gear 161 is swung by the swing lever to engage with the firstidle swing gear 162, and the firstdrive roller gear 143 engaged with the firstidle swing gear 162 rotates in the clockwise direction. - As the first
drive roller gear 143 rotates in the clockwise direction, thefirst drive rollers drive roller gear 143 on the firstdrive roller shaft 142 a, also rotates in the clockwise direction through thespring clutches - At this time, since the
bushing hubs spring clutches clutch springs bushing hubs bushing hubs bushing hubs roller hubs first drive rollers bushing hubs - Accordingly, the
second drive rollers first drive rollers - Also, as the first
drive roller gear 143 rotates in the clockwise direction, thepickup roller assembly 131 is moved from the ascent position (a dotted line of FIG. 3), where thepickup rollers pickup rollers pickup roller assembly 131 moves against the first elastic spring of thepickup roller assembly 131 by the weight of thepickup roller assembly 131 and the gearing force of the firstdrive roller gear 143, and at the same time, thepickup driving gear 139, positioned coaxially with the firstdrive roller gear 143 on the firstdrive roller shaft 142 a, rotates in the clockwise direction. - Accordingly, the
pickup roller gear 135, connected with thepickup driving gear 139 through the first, second, and thirdidle gears pickup rollers pickup roller gear 135 on thepickup roller shaft 134 a, rotate in the clockwise direction. As a result, thepickup rollers paper cassette 120. - At this time, among the sheets of paper P, only an uppermost sheet of paper P is conveyed to the first and the
second rive rollers pickup rollers friction buckler 128 installed in thepaper cassette 120. - Also, at this time, since the vector of force acting on the sheets of paper P by the
pickup roller assembly 131, that is, its own weight and the gearing force of the firstdrive roller gear 143, acts in the same direction as the vector of the rotating force acting on the sheets of paper P by thepickup rollers pickup rollers - The sheet of paper P conveyed to the first and the
second drive rollers feed roller 147 and thefriction roller 149 without being subjected to any drag force since the first and thesecond drive rollers - When the sheet of paper P almost arrives at the
feed roller 147 and operates a paper sensor (not shown) installed in the vicinity thereof, a controller (not shown) stops rotation of thepickup 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 thefeed roller 147 and thefriction roller 149. The controller then drives the drivingmotor 155 in the other direction, that is, the counter-clockwise direction (an arrow of dotted line in FIG. 3) to drive thefeed roller 147 and the dischargingroller 166. - As the driving
motor 155 rotates in the counter-clockwise direction, thefeed roller gear 148, connected to theshaft 155 a of the drivingmotor 155 through the first and the second transmitting gears 156 and 157, rotates in the clockwise direction, and thefriction roller 149 rotates in the counter-clockwise direction to feed the sheet of paper P. - As the
feed roller gear 148 rotates in the clockwise direction, theswing gear 161 is swung by the swing lever and engaged with the second idle swing gear 163. As a result, the seconddrive roller gear 145 connected with the second idle swing gear 163 rotates in the counter-clockwise direction. - As the second
drive roller gear 145 rotates in the counter-clockwise direction, thesecond drive rollers drive roller gear 145 on the seconddrive roller shaft 144 a, also rotate in the counter-clockwise direction, and thereby thefirst drive rollers second drive rollers - At this time, since the
first drive rollers roller hubs spring clutches clutch springs bushing hubs clutch springs bushing hubs first drive rollers - As the
first drive rollers motor 155 is not transferred to thepickup driving gear 139 of thepickup roller assembly 131, and thepickup roller assembly 131 is again moved into the ascent position (the dotted line of FIG. 3) by the first elastic spring of the pickuproller assembly lifter 150. - Accordingly, while fed by the
feed roller 147 and thefriction roller 148, 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 thesecond drive rollers pickup rollers feed roller 147 is improved and paper skewing or paper jamming is prevented. - After that, the sheet of paper P is printed at the image forming unit, and then discharged by the discharging
roller 146 and the dischargingbackup roller 167, which are connected with the drivingmotor 155 through the discharging roller gear train. - Referring to FIGS. 5 through 6B, a modified pickup
roller assembly lifter 150′ of the paper-feedingapparatus 100 is illustrated according to a second embodiment of the present invention. - The pickup
roller assembly lifter 150′ is installed with respect to thepickup roller assembly 131 and thepaper cassette 120. - The pickup
roller assembly lifter 150′ brings thepickup rollers pickup roller assembly 131 into contact, with a fifth predetermined pressure with the sheets of paper P when thepaper cassette 120 is mounted in the frame. The pickuproller assembly lifter 150′ also separates thepickup feed rollers paper cassette 120 is detached from the frame. - The pickup
roller assembly lifter 150′ comprises a lift guidinggroove portion 125 positioned at a top end of aside wall 123 of thepaper cassette 120, a liftingshaft 151 having a projectingguide 153 at a first end thereof and supported rotatably on the frame to be raised and lowered by the lift guidinggroove portion 125, alink member 154 installed between a second end of the liftingshaft 151 and thehousing 133 of thepickup roller assembly 131 to move thepickup rollers shaft 151 is rotated by the projectingguide 153, and a pullingpart 152 pulling thepickup roller assembly 131 in an upward direction to restore and maintain thepickup rollers pickup roller assembly 131 at the ascent position. - The lift guiding
groove portion 125 of thepaper cassette 120, and the projectingguide 153 of the liftingshaft 151, are respectively provided with a lockinggroove 125 a and a lockingprojection 153 a that engage each other when thepaper cassette 120 is completely mounted in the frame. - To easily rotate the
pickup roller assembly 131 about the firstdrive roller shaft 142 a, thelink member 154 has afirst link 154 a having a first end fixed at the second end of the liftingshaft 151, and asecond link 154 b having first and second ends supported rotatably at a second end of thefirst link 154 a and thehousing 133 ofpickup roller assembly 131, respectively. - According to one aspect, the pulling
part 152 comprises an extension spring having one end fixed at athird fixing projection 133 b of thehousing 133 of thepickup roller assembly 131, and the other end fixed at a fourth fixing projection (not shown) positioned at the frame. According to another aspect, the extension spring of the pullingpart 152 is constructed to be fixed between thesecond link 154 b of thelink member 154 and the frame. - The operation of the modified pickup
roller assembly lifter 150′ constructed as above is as follows. - As is shown in FIG. 6A, assuming that the
paper cassette 120 is not mounted in the frame, thepaper cassette 120 in which sheets of paper P are stacked first moves in a direction of arrow A to be mounted in the frame. - At this time, as the projecting
guide 153 is guided and raised along the lift guidinggroove portion 125, the liftingshaft 151 rotates in a clockwise direction. - Accordingly, the
first link 154 a connected to the liftingshaft 151 rotates in the clockwise direction about the liftingshaft 151 to pull thesecond link 154 b downwardly, and thereby thehousing 133 of thepickup roller assembly 131 hinged with thesecond link 154 b descends downwardly against the extension spring of the pullingpart 152. - As is described above, when the
paper cassette 120 is completely mounted in the frame, and thus the lockingprojection 153 a of the projectingguide 153 is inserted in the lockinggroove 125 a of the lift guidinggroove portion 125, thepickup rollers - Next, the operation of detaching the
paper cassette 120 will be explained. - Firstly, the
paper cassette 120 moves in a direction of arrow B to be detached from the frame, as is shown in FIG. 6B. - At this time, as the lift guiding
groove portion 125 is ejected from the frame together with thepaper cassette 120, the projectingguide 153, which urges the liftingshaft 151 to rotate in the clockwise direction, is released from the lift guidinggroove portion 125. - As a result, by an extension force of the extension spring of the pulling
part 152, thehousing 133 of thepickup roller assembly 131 and thesecond link 154 b are pulled and upwardly raised, and the liftingshaft 151 rotates in an counter-clockwise direction. - As the
housing 133 of thepickup roller assembly 131 is raised, thepickup rollers - As is apparent from the foregoing description, it can be appreciated that the paper-feeding
apparatus 10 of the image forming apparatus according to embodiments of the present invention can prevent paper feed troubles such as paper jams and paper skewing, and improve the paper-feeding accuracy of thefeed roller 147, by removing the drag force generated by the first and thesecond drive rollers - Also, the paper-feeding
apparatus 10 can improve the pickup efficiency of thepickup rollers pickup roller assembly 131, that is, its own weight and the gearing force of thepickup driving gear 139 or the force of the projectingguide 153 of the pickuproller assembly lifter 150′, in the same direction as that of the rotating force acting on the sheets of paper P by thepickup rollers - Although a few embodiments of the present invention have been shown and described, it would be appreciated by those skilled in the art that changes may be made in this embodiment without departing from the principles and spirit of the invention, the scope of which is defined in the claims and their equivalents.
Claims (23)
1. A paper-feeding apparatus of an image forming apparatus having first and second drive roller shafts, and a paper cassette, the paper-feeding apparatus comprising:
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 feeding mode.
2. The paper-feeding apparatus according to claim 1 , wherein the paper-feeding apparatus further comprises:
a rotatable feed roller part transmitting the driving force to the drive roller power transmitter; and
a driving motor transmitting the driving force to the feed roller part.
3. The paper-feeding apparatus according to claim 2 , wherein:
the feed roller part comprises
a feed roller, and
a feed roller gear, fixedly positioned coaxially with the feed roller; and
the paper-feeding apparatus further comprises at least one power transmitting gear transmitting the driving force from the driving motor to the feed roller gear.
4. The paper-feeding apparatus according to claim 2 , wherein the drive roller power transmitter comprises:
a swing gear part transmitting the driving force from the feed roller part to one of the first drive roller and the second drive roller, according to a rotational direction of the feed roller part, wherein the feed roller part rotates in a first rotational direction during the paper pickup mode, and rotates in a second rotational direction opposite the first rotational direction during the line feeding mode.
5. The paper-feeding apparatus according to claim 4 , wherein:
the paper-feeding apparatus further comprises
a first drive roller gear fixedly positioned coaxially with the first drive roller, and
a second drive roller gear fixedly positioned coaxially with the second drive roller; and
the swing gear part comprises
a first idle swing gear engaging the first drive roller gear;
a second idle swing gear engaging the second drive roller gear;
at least one swing gear engaging the feed roller part, and selectively engaging one of the first and the second idle swing gears according to the rotating direction of the feed roller part.
6. The paper-feeding apparatus according to claim 5 , wherein the swing gear part further comprises:
at least one swing gear shaft, on which the at least one swing gear is rotatably disposed; and
a swing lever, rotatably connected at a first end thereof to the at least one swing gear shaft, and hingedly connected at a second end thereof to a frame, movable, so that the swing gear selectively engages one of the first and the second idle swing gears according to the rotating direction of the feed roller part.
7. The paper-feeding apparatus according to claim 5 , wherein:
during the paper pickup mode,
the first idle swing gear engages and transmits the driving force to the first drive roller gear, and
the first drive roller transmits the driving force to the second drive roller; and
during the line feeding mode,
the second idle swing gear engages and transmits the driving force to the second drive roller gear, and
the second drive roller transmits the driving force to the first drive roller.
8. The paper-feeding apparatus according to claim 7 , wherein the drive roller power transmitter comprises:
a one-way power transmitting part disposed coaxially with the first drive roller,
transmitting the driving force to the second drive roller through the first drive roller during the paper pickup mode, and
not transmitting the driving force to the pickup roller assembly during the line feeding mode, to allow the first drive roller to idle.
9. The paper-feeding apparatus according to claim 8 , wherein the one-way power transmitting part comprises:
a spring clutch comprising
a roller hub of the first drive roller,
a bushing fixedly positioned coaxially with the first drive roller and having a bushing hub, and
a clutch spring coiled around the roller hub and the bushing hub to generate a sliding friction force therebetween,
wherein during the paper pickup mode,
the first drive roller gear transmits the driving force pickup roller assembly and the bushing via the first drive roller shaft, and
the clutch spring is coiled in a winding direction thereof, and engages the roller hub, thereby transmitting the driving force to the first drive roller, and
during the line feeding mode,
the second drive roller transmits the driving force to the first drive roller, thereby rotating the roller hub and uncoiling the clutch spring in an anti-winding direction thereof, and thereby not transmitting the driving force to any of the bushing, first drive roller shaft, and the pickup roller assembly.
10. The paper-feeding apparatus according to claim 8 , wherein the one-way power transmitting part comprises a ratchet.
11. The paper-feeding apparatus according to claim 1 , wherein the pickup roller assembly comprises:
a pickup driving gear disposed on the first drive roller shaft; and
at least one idle pickup gear disposed between the pickup driving gear and the pickup roller to transmit the driving power from the pickup driving gear to the pickup roller.
12. The paper-feeding apparatus according to claim 11 , wherein the pickup roller assembly further comprises a pickup roller gear positioned coaxially with the pickup roller,
wherein the at least one idle pickup gear is disposed between the pickup driving gear and the pickup roller gear, and transmits the driving power from the pickup driving gear to the pickup roller gear.
13. The paper-feeding apparatus according to claim 1 , further comprising a second drive roller releaser to separate the second drive roller from the first drive roller.
14. The paper-feeding apparatus according to claim 13 , wherein the second drive roller releaser comprises:
a releasing lever, with a first end rotatably disposed on a frame, and a second end rotatably supporting the second drive roller shaft; and
a restoring part biasing the releasing lever such that the second drive roller contacts the first drive roller with a predetermined pressure.
15. The paper-feeding apparatus according to claim 14 , wherein:
the releasing lever comprises a fixing projection; and
the restoring part comprises an elastic spring with ends, respectively supported on the fixing projection and the frame.
16. The paper-feeding apparatus according to claim 1 , further comprising:
a pickup roller assembly lifter, selectively separating the pickup roller from the sheet of paper.
17. The paper-feeding apparatus according to claim 16 , wherein:
during the paper pickup mode, the pickup contacts the sheet of paper.
18. The paper-feeding apparatus according to claim 17 , wherein:
the pickup roller assembly comprises a supporting projection; and
the pickup roller assembly lifter comprises an elastic spring disposed on the first drive roller shaft, biasing the pickup roller assembly in a first rotational direction, and having ends supported respectively on a frame and the supporting projection.
19. The paper-feeding apparatus according to claim 17 , wherein
the pickup roller assembly lifter separates the pickup roller from the sheet of paper when the paper cassette is detached from a frame, and brings the pickup roller into contact with the sheet of paper when the paper cassette is inserted into the frame.
20. The paper-feeding apparatus according to claim 19 , wherein the pickup roller assembly lifter comprises:
a lift guiding groove portion positioned at a top end of a sidewall of the paper cassette;
a lifting shaft supported rotatably on the frame, and including a projecting guide at a first end thereof guided by the lift guiding groove portion, thereby rotating the lifting shaft;
a link member installed between a second end of the lifting shaft and the pickup roller assembly, to move the pickup roller between a descent position contacting the sheet of paper and an ascent position separated from the sheet of paper when the lifting shaft is rotated by the projecting guide; and
a pulling part to bias the pickup roller assembly in a first rotational direction toward the ascent position.
21. The paper-feeding apparatus according to claim 20 , wherein the link member comprises:
a first link with a first end fixed at the second end of the lifting shaft; and
a second link with first and second ends, respectively, rotatably supported at a second end of the first link and the pickup roller assembly.
22. The paper-feeding apparatus according to claim 20 , wherein the pulling part comprises:
an extension spring having a first end supported at one of the pickup roller assembly, and the second link, and a second end supported at the frame.
23. A paper-feeding apparatus of an image forming apparatus, comprising:
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.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR10-2003-0023790A KR100513753B1 (en) | 2003-04-15 | 2003-04-15 | Paper-feeding apparatus of office machine |
KR2003-23790 | 2003-04-15 |
Publications (1)
Publication Number | Publication Date |
---|---|
US20040207145A1 true US20040207145A1 (en) | 2004-10-21 |
Family
ID=33157315
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/791,757 Abandoned US20040207145A1 (en) | 2003-04-15 | 2004-03-04 | Paper-feeding apparatus of an image forming apparatus |
Country Status (3)
Country | Link |
---|---|
US (1) | US20040207145A1 (en) |
KR (1) | KR100513753B1 (en) |
CN (1) | CN1307085C (en) |
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US20050017432A1 (en) * | 2003-07-03 | 2005-01-27 | Masaaki Mitsuhashi | Paper feeding apparatus |
US20060071399A1 (en) * | 2004-09-15 | 2006-04-06 | Brother Kogyo Kabushiki Kaisha | Image recording apparatus |
US20060071398A1 (en) * | 2004-08-10 | 2006-04-06 | Bdt Ag. | Device for separation and feeding of sheets of a recording carrier |
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 |
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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 |
US20070290430A1 (en) * | 2006-06-16 | 2007-12-20 | Primax Electronics Ltd. | Sheet pick-up device |
US20090152797A1 (en) * | 2007-12-18 | 2009-06-18 | Niko Jay Murrell | Media Sheet Input Devices For Use In An Image Forming Apparatus |
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US20100071190A1 (en) * | 2005-12-05 | 2010-03-25 | Silverbrook Research Pty Ltd | Method Of Assembling Print Media Transport Arrangement |
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US20100164168A1 (en) * | 2005-12-05 | 2010-07-01 | Silverbrook Research Pty Ltd | Printer having geared media pick-up roller |
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US7080833B2 (en) * | 2003-07-03 | 2006-07-25 | Funai Electric Co., Ltd. | Paper feeding apparatus |
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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 |
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US20070002117A1 (en) * | 2005-06-30 | 2007-01-04 | Katsuhiko Miki | Image forming apparatus |
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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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US7568693B2 (en) * | 2006-02-02 | 2009-08-04 | Brother Kogyo Kabushiki Kaisha | Image forming apparatus having supporting member that supports bottom portion of feeding tray |
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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WO2009093830A3 (en) * | 2008-01-21 | 2009-10-22 | 엘지엔시스 주식회사 | Media separating apparatus of automatic media dispenser |
US20110049786A1 (en) * | 2008-01-21 | 2011-03-03 | Lg N-Sys Inc. | Media separating apparatus of automatic media dispenser |
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 |
Also Published As
Publication number | Publication date |
---|---|
KR100513753B1 (en) | 2005-09-09 |
CN1307085C (en) | 2007-03-28 |
KR20040089939A (en) | 2004-10-22 |
CN1537799A (en) | 2004-10-20 |
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Legal Events
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STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |
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AS | Assignment |
Owner name: S-PRINTING SOLUTION CO., LTD., KOREA, REPUBLIC OF Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SAMSUNG ELECTRONICS CO., LTD;REEL/FRAME:041852/0125 Effective date: 20161104 |