JP3767240B2 - Paper feeder - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is a sheet-feeding paper feeding device in an image forming apparatus such as a copying machine, a facsimile machine, a printer, or the like, and a paper feeding device used in an automatic document feeding apparatus attached to an image reading device or the like. The present invention relates to a paper roller, a paper feeding device, and an image forming apparatus.
[0002]
[Prior art]
Conventionally, in an image forming apparatus such as a copying machine, a facsimile machine, and a printer, sheets stacked in a paper storage unit such as a paper tray, a paper feed cassette, and a paper stacker are sequentially taken out one by one from the top or bottom. A paper feeding device for sending to an image forming unit or the like is provided.
[0003]
In general, this type of paper feeding device includes a feeding roller for feeding paper from a paper storage means as a paper feeding roller, as disclosed in JP-A-62-210534 and JP-A-63-57447. The feed roller and the separation roller are provided in pressure contact with each other downstream of the delivery roller, and the fed paper is inserted between the feed roller and the separation roller and then fed one by one. It is supposed to be.
[0004]
FIG. 9 is a cross-sectional view of a conventional paper roller type paper feeder.
[0005]
In the paper feeding process of the paper feeding device, first, the upper surface of the paper P stacked on the movable bottom plate rises to a set position by driving an elevating means (not shown), and the feeding roller 1 and the feed roller 2 are rotated by a paper feeding signal. To start.
[0006]
The feeding roller 1 pressed against the upper surface of the sheet with the predetermined pressure P1 is released from the sheet surface after feeding the sheet P to the nip position between the feed roller 2 and the separating roller 3.
[0007]
The winding roller 3 is capable of driving the paper P in a direction opposite to the traveling direction of the paper P by a torque limiter 4 transmitted by a gear train, and is pressed against the feed roller 2 by a predetermined pressure by an elastic member. When there is no paper P between the nips and the paper roller 3 is in direct contact with the feed roller 2 or when a single paper P is fed between the nips, the separation roller 3 exceeds the limit torque of the torque limiter 4 and feed roller 2 Followed rotation. However, when two or more sheets of paper P overlap each other and are fed between the nips, the limit torque overcomes the friction force between the sheets, reversely rotates the roller 3 and pushes back the lower sheet P to make many Sheet feeding is prevented.
[0008]
In the conventional paper feeding device, the feeding roller 1 is provided on the paper P stacked on the paper tray so as to be in pressure contact, and the paper P is fed by the rotation of the feeding roller 1.
[0009]
10 (a) and 10 (b) are enlarged front views of the feeding roller 1 that has been widely used in the past.
[0010]
A delivery roller 1 shown in FIG. 10A is provided with a plurality of protrusions 1C on the outer peripheral surface of a cylindrical rotating body 1B having elasticity in a direction parallel to the rotation shaft 1A, and the protrusion 1C has a trapezoidal shape. None, the peak angle α1 at the tip is about 40 °.
[0011]
Further, the protrusion 1C of the feed roller 1 shown in FIG. 10 (b) has an equilateral mountain shape, and the crest angle α2 at the tip is about 40 °.
[0012]
Here, as shown in FIGS. 10C and 10D, the peak angle is drawn on the inclined surfaces on both sides of the peak at a height of 3h / 4, where h is the height of the peak. It is defined as the angle formed by the tangent line.
[0013]
In FIG. 9, a separating unit including an opposing feed roller 2 and a separating roller 3 is provided following the feed roller 1, and when the paper P is double-fed (multi-sheet feed), In this paper feeding method, only the uppermost sheet of the fed paper is fed and the paper P below it is returned.
[0014]
In the paper feeding method, the feed roller 2 includes a cylindrical rotating body 2B having elasticity and a rotating shaft 2A, and is driven to rotate from a driving source (not shown) via a gear train. The roller 3 is driven and rotated integrally with the rotary shaft 3A through a gear train branched from the drive source. The gear g3 fixed to the rotating shaft 3A of the winding roller 3 is connected to a gear g1 fixed to the torque limiter shaft 4A provided with the torque limiter 4 via an intermediate gear g2.
[0015]
The rotary shaft 3A is pivotally supported by the pressure arm member 5 and is rotatable. The pressure arm member 5 is elastically biased by an elastic member provided between a fixed portion of the frame of the image forming apparatus and is configured to press the roller 3 against the feed roller 2. Yes. An intermediate transport roller pair 9 is disposed downstream of the separating unit in the paper transport direction.
[0016]
Further, the driving force of the roller 3 transmits the driving torque from the driving source via the gear train. In the separating means of the roller type, the torque limiter 4 is generally connected in the middle of the drive transmission system. The forward / reverse rotation direction of the separation roller 3 changes depending on the relationship between the force acting on the separation roller 3 via the sheet P and the force of the torque limiter 4, and this action prevents double feeding of the sheet P. . The driving force is transmitted as a force for rotating the roller 3 in the direction opposite to the conveyance direction of the paper P.
[0017]
In the paper feeding process of the paper feeding device, first, the upper surface position of the paper P is raised to the set position, and the feed roller 1 and the feed roller 2 start to rotate by the paper feed signal. The feed roller 1 pressed against the upper surface of the paper with a predetermined pressure sends the paper P to the nip position between the feed roller 2 and the separating roller 3, and then the pressure contact is released from the paper surface.
[0018]
As shown in FIG. 9, the pressing force of the whirling roller 3 against the feed roller 2 is based on the pressing force of the elastic member via the swinging fulcrum shaft of the pressure arm member 5 that supports the whirling roller 3 so as to swing. The position of the torque limiter shaft 4A, which is the swing fulcrum shaft, is normally set to a position that avoids the paper P conveyance path.
[0019]
In general, the position of the torque limiter shaft 4A is such that the common normal line m connecting the center of the rotating shaft 3A of the roller 3 and the center of the rotating shaft 2A of the feed roller 2, the center of the rotating shaft 3A of the roller 3 and the torque limiter. An angle θ1 formed with a common normal n connecting the center of the axis 4A is set to 104 ° to 110 °.
[0020]
When the angle θ1 is set to 104 ° to 110 °, the rotational moment of the torque limiter 4 is easily applied to the feed roller 2, and the pressure contact of the roller 3 with the feed roller 2 is different between when stationary and when driven. When the angle of the torque limiter shaft 4A is set as described above, it is difficult to manage the pressure contact force, and the rotational moment of the torque limiter 4 does not become uniform under the conditions of the paper to be passed, so that the paper separation performance is not stable.
[0021]
[Problems to be solved by the invention]
(First issue)
The feeding performance of the feed roller and the feed roller is deteriorated due to abrasion of the roller surface and adhesion of paper dust caused by feeding the paper. Therefore, maintenance is performed when a paper feed failure occurs or when the set total number of paper feeds is reached. In the maintenance process, it is necessary to remove the roller from the paper feeding device in order to clean and replace the roller.
In the conventional paper feeder, a. B. Unitizing the delivery roller, coupling the drive with the separating means with a coupling, and replacing each unit of the delivery roller; For example, a mechanism is used in which a roller is disposed outside a holding member that holds the rotation shaft of the roller. However, a. Is a waste of replacement parts. Has problems such as unstable roller support.
[0022]
(Second problem)
The conventional separating means of the roller type has a disadvantage that the roller is worn more than other rollers such as a feed roller and a feed roller, so that the durability is inferior and the cycle for replacing with a new roller is short. is there. That is, when the surface of the roller is worn, the outer diameter is reduced, the pressing load of the roller 3 is decreased, and the paper feeding condition is changed due to the decrease of the dynamic friction coefficient of the surface. appear.
In addition, by making the difference between the rolling roller pressure, which is the pressing force of the rolling roller against the feed roller, between the stationary state and the driving state, the influence of the rotational moment of the torque limiter changes the paper conditions. In addition, a paper feeding device in which separation performance is kept constant is provided. As a result, the same paper feeding / separating performance as that of plain paper is achieved for recycled paper.
[0027]
[Means for Solving the Problems]
(1) The sheet feeding device of the present invention feeds at least one sheet out of a plurality of sheets stacked on the sheet feeding unit by the feeding unit, and separates and feeds one sheet by the separating unit. In the paper device, the feed roller of the feed means and the feed roller of the separation means are formed as an integral unit so as to be detachable from the paper feed device, and are disposed at both ends of the feed roller and both ends of the feed roller, A rotation shaft of the feed roller, a bearing member that rotatably holds the rotation shaft of the feed roller, and a holding member that supports both ends of the feed roller and the feed roller by holding the bearing member at a notch, (Claim 1).
[0028]
(2) Further , the paper feeding device of the present invention is a paper feeding device that feeds a plurality of sheets stacked on a paper feeding unit by a feeding unit and separates and feeds one sheet by a separating unit. The separating means includes a feed roller that is driven to rotate in the forward direction, a separating roller that is driven to rotate in the reverse direction and presses against the feed roller via the paper, and a rotating spindle that supports the separating roller so as to be swingable and is connected to a driving source. A common normal line connecting the center of the roller and the rotation center of the feed roller, and a common line connecting the center of the roller and the rotation shaft. The angle formed with the normal is set within a range of 90 ° ± 12 ° (claim 2).
[0035]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of a paper feed roller, a paper feed device, and an image forming apparatus according to the present invention will be described below with reference to the accompanying drawings.
[0036]
FIG. 1 is an overall configuration diagram of a digital image forming apparatus provided with a sheet feeding device according to the present invention.
[0037]
The image forming apparatus of the present invention includes an image reading unit A, an image forming unit B, an image processing unit C, an image writing unit D, and cassette feeding units E1, E2, E3, manual feeding as the sheet feeding device in the present invention. A unit F, a large capacity sheet feeding unit (LCT) G, an automatic duplex copying sheet feeding unit (ADU) H, and a sheet feeding unit of an automatic document feeder DF.
[0038]
Each of the sheet feeding units of the image forming apparatus is provided with a paper roller type feeding unit for preventing double feeding. That is, the automatic document feeder DF is fed with paper feeding means K1, the cassette paper feeding parts E1, E2, E3 are fed with paper feeding means K2, K3, K4, the manual paper feeding part F is fed with paper feeding means K5, and the large capacity paper feeding part G is fed. A sheet feeding means K6 is provided. These paper feeding units have almost the same structure.
[0039]
FIG. 2 is a cross-sectional view showing an embodiment of the paper feeding device of the present invention, and FIG. 3A is an upper portion of a paper feeding device having a feed roller 1 and a feed roller 2 as an example of the paper feeding roller of the present invention. FIG. 3B is a front view, FIG. 4A is a cross-sectional view of the upper mechanism of the paper feeding device, and FIG. 4B is a cross-sectional view taken along line AA. In addition, about the code | symbol used in these drawings, the part which has the same function as FIG. 9 is attached | subjected. Moreover, a different point from the above is demonstrated.
[0040]
The upper mechanism above the sheet conveyance path of the sheet feeding device includes a feed roller 1, a feed roller 2, bearing members 11A and 11B, a holding member 12, timing pulleys 13A and 13B, a timing belt 14, and a locking mechanism. It comprises members 15A and 15B and a roller holder 16.
[0041]
The feed roller 1, the feed roller 2, and the timing pulleys 13A and 13B are rotatably supported between the side wall portions 12a and 12b of the holding member 12.
[0042]
The notches 12c and 12d formed in one side wall portion 12a of the holding member 12 hold the outer periphery of the two bearing portions of the bearing member 11A.
[0043]
The notches 12c and 12d drilled in the other side wall 12b of the holding member 12 hold the outer periphery of the two bearing portions of the bearing member 11B.
[0044]
The bearing members 11A and 11B hold the rotary shaft 1A of the feed roller 1 and the rotary shaft 2A of the feed roller rotatably, and hold both the rotary shafts 1A and 2A in parallel at a predetermined interval.
[0045]
The locking members 15A, 15B, and 15C are fitted to the neck portions of the rotary shafts 1A and 2A to position the bearing members 11A and 11B in the axial direction. The roller holder 16 is a member that mounts the rotating body 1 </ b> B on the rotating shaft 1 </ b> A of the delivery roller 1.
[0046]
The gear g4 fixed to the shaft end of the rotating shaft 2A is connected to a transmission means from a driving source and rotates. A timing belt 14 is wound around a timing pulley 13B fixed to the rotating shaft 2A and a timing pulley 13A fixed to the rotating shaft 1A. The rotating shaft 2 </ b> A that is driven and rotated rotates the rotating shaft 1 </ b> A via the timing belt 14. Therefore, the feed roller 2 and the feed roller 1 rotate simultaneously in the same direction.
[0047]
By supporting both ends of the feed roller 1, the feed roller 2, the timing pulleys 13 </ b> A and 13 </ b> B, and the timing belt 14 so as to be rotatable between the side wall portions 12 a and 12 b of the holding member 12, compared to the conventional cantilever support type, Smooth drive rotation and uniform contact of both rollers 1 and 2 with the paper surface are stably performed.
[0048]
When the delivery roller 1 and the feed roller 2 are removed from the rotary shafts 1A and 2A, the locking members 15A, 15B and 15C are first removed from the rotary shafts 1A and 2A. Next, the bearing members 11A and 11B holding the rotary shafts 1A and 2A are shifted outward, and the holding member 12 is removed. That is, the engagement between the notches 12c and 12d formed in the side walls 12a and 12b of the holding member 12 and the outer peripheral surfaces of the bearing members 11A and 11B is released, and the holding member 12 is removed.
[0049]
Next, the bearing member 11B is taken out in the axial direction from the rotary shafts 1A and 2A. In this state, the feed roller 1 and the feed roller 2 can be easily detached from the rotary shafts 1A and 2A, respectively.
[0050]
The cylindrical rotating body constituting the feed roller as the paper feed roller of the present invention is made of an elastic rubber material, and urethane rubber, acrylonitrile-butadiene rubber (NBR), ethylene-propylene rubber (EPDM), or the like is used. In particular, ethylene-propylene rubber is preferable, and the hardness is defined by JIS-K6301A type, and is preferably 25 to 65 degrees.
[0051]
Further, the shape of the plurality of protrusion ridges provided on the outer peripheral surface of the cylindrical rotating body is:
A: The height h of the mountain is 0.5-7 mm,
B: The width W of the tip of the mountain is 1 mm or less, or the radius R of the tip of the mountain is 1 mm or less,
C: The mountain angle α is preferably 0 to 30 °. Note that the width W is applied when the tip of the mountain is flat, and the radius R of the circle including the apex is applied when it is curved.
[0052]
By using the shape of the protrusion ridges that are sharper than the conventional one, when the feed roller rotates while pressing against the surface of the paper, the bite to the paper is good and the paper is reliably fed. And can be stabilized.
[0053]
Furthermore, in the shape of the peak of the protrusion, the angle of the valley formed by two tangent lines drawn at a height position of h / 4 with respect to the height h of the peak is set in the valley between the peaks. Assuming that the valley angle is β, it is preferable to satisfy the relationship of mountain angle α <valley angle β. By making α <β, the strength at the root portion of the protrusion can be improved, and the advantages of remarkably improving the moldability can be obtained.
[0054]
Next, a specific example is shown in FIG. FIG. 5 is an enlarged front view (a1, b1, c1) and a partially enlarged view (a2, b2, c2) of the feed rollers 1a, 1b, 1c.
[0055]
The rotating bodies 1B of the feed rollers 1a, 1b, and 1c are all made of ethylene / propylene rubber (EPDM), and have hardnesses of 40 degrees, 35 degrees, and 30 degrees, respectively.
[0056]
A delivery roller 1a shown in FIG. 5A1 is provided with a plurality of protrusions 1C on the outer peripheral surface of a cylindrical rotating body 1B having elasticity in a direction parallel to the rotation shaft 1A. The shape of each mountain of the protrusion 1C is an equilateral mountain shape, and a tip portion having a radius R is formed at the top.
[0057]
The specifications of the protrusion 1C shown in the enlarged partial view of FIG. 5 (a2) are shown below.
[0058]
A: The height h of the mountain is 2.5 mm, B: The radius R of the tip end a of the mountain is 0.2 mm, and C: The angle α3 of the mountain is 20 °. In this case, the valley angle β is 20 °, which is the same as the mountain angle α3.
[0059]
The shape of each mountain of the protrusion 1C of the feed roller 1b shown in FIGS. 5B1 and 5B2 is a mountain shape having a vertical inclined surface.
[0060]
The specifications of the protrusion shown in the enlarged partial view of FIG. 5 (b2) are shown below.
[0061]
A: The height h of the peak is 3.0 mm, B: the radius R of the tip end a of the peak is 0.8 mm, and C: the angle α4 of the peak is 0 °. In this case, the valley angle β is 0 °, which is the same as the mountain angle α4.
[0062]
5 (c1) and 5 (c2), the shape of each mountain of the protrusion 1C of the feed roller 1c is a mountain shape in which the inclined surface of the base portion b is gentle relative to the inclined surface of the tip end portion a. There is no.
[0063]
The specifications of the protrusion shown in the enlarged partial view of FIG. 5 (c2) are shown below.
[0064]
A: The height h of the mountain is 2.5 mm, B: The radius R of the tip end a of the mountain is 0.2 mm, and C: The angle α4 of the mountain is 20 °. In this case, the valley angle β is 60 °, and α <β.
[0065]
The three types of delivery rollers 1a, 1b, and 1c shown in FIG. 5 have good biting on the paper, and the paper can be fed reliably and stably. In particular, in FIG. 5 (c1), the molding processability was even better.
[0066]
In the sheet feeding device of the present invention shown in FIG. 2, a separating roller 3 that is pressed from below is disposed on the feed roller 2 of the upper mechanism. The roller 3 is rotatably supported at one end of the pressure arm member 17 and is driven to rotate from a drive source via a transmission mechanism. The other end of the pressure arm member 17 is swingably supported by a swing fulcrum shaft 19 of a fixed machine frame 18 fixed to the image forming apparatus main body.
[0067]
The pressure arm member 17 is urged by an elastic member provided between the fixing portion of the frame of the image forming apparatus and presses the roller 3 against the feed roller 2. The pressing force of the whirling roller 3 against the feed roller 2 is based on the pressing force of the elastic member via the rocking fulcrum shaft 19 of the pressure arm member 5 that supports the whirling roller 3 so as to be rockable.
[0068]
On the axis of the swing fulcrum shaft 19, the torque limiter shaft 4A of the torque limiter 4 is arranged. A gear g1 fixed on the axis of the swing fulcrum shaft 19 is connected to a gear g3 fixed to the rotary shaft 3A of the roller 3 via an intermediate gear g2.
[0069]
The position of the torque limiter shaft 4A includes a common normal line m connecting the center of the rotating shaft 3A of the whirling roller 3 and the center of the rotating shaft 2A of the feed roller 2, and the center of the rotating shaft 3A of the whirling roller 3 and the torque limiter shaft 4A. It is preferable that the angle θ2 formed by the common normal line n connecting with the center of is set within a range of 90 ° ± 12 °.
[0070]
If the feed roller 2, the rolling roller 3, and the swing fulcrum shaft 19 are arranged so that the angle θ2 falls within this range, the rotational moment of the torque limiter 4 with respect to the feed roller 2 is reduced, and the rolling roller pressure is stationary. There is little difference between driving and driving, and stable separation performance can be obtained.
[0071]
6 is a sectional view of the vicinity of the sheet feeding means K5 of the manual sheet feeding section F in FIG. 1, FIG. 7 is a mechanism diagram of the driving means for feeding, and FIG. 8 is a schematic diagram of the driving means for feeding. is there.
[0072]
In FIG. 1, intermediate conveyance rollers 7 and 8 are arranged on the upstream side of the registration roller 6 in the sheet conveyance direction. Intermediate transport rollers 7 and 8 are paper P fed from cassette paper feeding units E1, E2, and E3, a large capacity paper feeding unit (LCT) G, and an automatic double-sided copy paper feeding unit (ADU) H below the image forming apparatus. Is conveyed and fed to the registration roller 6. The paper P fed from the paper feeding means K5 of the manual paper feeding unit F is directly fed to the registration roller 6.
[0073]
As the drive motor M rotates forward, the gear g10 on the drive shaft rotates forward (solid arrow in the counterclockwise direction shown in FIG. 7), and the gear g11 fixed to the intermediate shaft 20 rotates in the clockwise direction ( Forward rotation).
[0074]
One-way clutch built-in gears g12 and g13 are coaxially arranged on the intermediate shaft 20 so as to be rotatable on the same axis. The one-way clutch (CL1) built-in type gear g12 rotates the gear g14 fixed to the rotation shaft 8A of the intermediate conveyance roller 8 in the normal direction. At the same time, the one-way clutch built-in gear g12 rotates the gear g15 fixed to the rotating shaft 7A of the intermediate conveyance roller 7 in the normal direction.
[0075]
Feeding from the cassette paper feeding units E1, E2, E3, the large-capacity paper feeding unit G, and the automatic double-sided copy paper feeding unit (ADU) H is enabled by the forward rotation of the intermediate transport rollers 7 and 8.
[0076]
The one-way clutch (CL2) built-in type gear g13 is connected to a gear g15 fixed to the rotation shaft 2A of the feed roller 2 via intermediate gears g16 and g17.
[0077]
During the forward rotation of the drive motor M (solid arrow in the counterclockwise direction shown in FIG. 7), the rotation is not transmitted to the intermediate gear g16 meshing with the one-way clutch built-in gear g13, and the intermediate gear g17 and the gear g18. The feed roller 2 does not rotate, and no paper is fed from the paper feed means K5 of the manual paper feed unit F.
[0078]
When the drive motor M is switched to reverse rotation drive, the gear g10 on the drive shaft rotates reversely (the broken line arrow in the clockwise direction shown in FIG. 7), and the one-way clutch built-in gear g13 on the intermediate shaft 20 rotates in reverse. Then, the gear g18 fixed to the rotation shaft 2A of the feed roller 2 is rotated forward via the intermediate gears g16 and g17.
[0079]
During the reverse rotation of the drive motor M, the one-way clutch built-in gear g12 cannot rotate, the rotation is not transmitted to the meshing gears g14 and g15, the intermediate transport rollers 7 and 8 do not rotate, and the cassette paper feeding unit E1. , E2, E3, large-capacity paper feeding unit G, and automatic duplex copying paper feeding unit H are not fed.
[0080]
In general, it is necessary to control the feed roller linear speed in order to make the feed line speed faster than the line speed of the image forming process and to secure a paper feed margin. In particular, it is necessary to switch the linear velocity before and after the registration roller. Therefore, it is effective and preferable to use a stepping motor as the drive motor M.
[0081]
As a further effective use of this stepping motor, a one-way clutch is used in combination with a drive switching control of a feed roller for feeding in two different paper feed paths, and a paper feed path is distributed by a stepping motor rotation direction switching control. It becomes easy.
[0082]
In particular, the feeding from the manual sheet feeding unit F and the feeding from the cassette sheet feeding units E1 and E2 are often independent, and the driving for feeding performs different operations. By the combination of one stepping motor and one-way clutch of the invention, simplification of the sheet feeding mechanism and stabilization of operation are achieved.
[0083]
Conventionally, electromagnetic clutches, spring clutches, and the like have been used for drive switching, but there are problems such as durability and noise generation. The drive means for paper feed of the present invention is also effective in solving these problems.
[0084]
【The invention's effect】
(1) The sheet feeding device of the present invention has a feed roller, a feed roller, a timing pulley, and a timing belt supported at both ends rotatably between the side wall portions of the holding member. Smooth drive rotation and uniform contact of both rollers with the paper surface are stably performed. Further, since the holding member can be easily attached and detached, the upper mechanism of the sheet feeding device can be quickly disassembled and assembled (claim 1).
[0085]
(2) In the paper feeding device according to the present invention, the rotation angle of the torque limiter with respect to the feed roller is reduced by arranging the swinging angle of the roller in a predetermined range, and the roller pressure is different between the stationary roller and the driven roller. And stable separation performance can be obtained (claim 2).
[Brief description of the drawings]
FIG. 1 is an overall configuration diagram of a digital image forming apparatus including a paper feeding device according to the present invention.
FIG. 2 is a cross-sectional view of a paper feeding device according to the present invention.
FIGS. 3A and 3B are a plan view and a front view of an upper mechanism of a paper feed path including a feed roller and a feed roller. FIGS.
4A and 4B are a cross-sectional view and an AA cross-sectional view of an upper mechanism of the paper feeding device.
FIG. 5 is an enlarged front view and a partially enlarged view of a feed roller.
FIG. 6 is a cross-sectional view of the vicinity of a sheet feeding unit of a manual sheet feeding unit.
FIG. 7 is a mechanism diagram of a driving unit for paper feeding.
FIG. 8 is a schematic diagram of a driving unit for paper feeding.
FIG. 9 is a cross-sectional view of a conventional paper roller type paper feeder.
FIG. 10 is an enlarged front view of a conventional delivery roller.
[Explanation of symbols]
1, 1a, 1b, 1c Feed rollers 1A, 2A, 3A, 7A, 8A Rotating shaft 2 Feed roller 3 Rolling roller 4 Torque limiter 4A Torque limiter shaft 5, 17 Pressure arm member 6 Registration rollers 7, 8, 9 Intermediate transport Roller 11A, 11B Bearing member 12 Holding member 14 Timing belt 16 Roller holder 19 Oscillating fulcrum shaft 20 Intermediate shaft CL1, CL2 One-way clutch K1-K6 Paper feed means g12, g13 One-way clutch built-in gear P Paper α1-α4, α Mountain Angle (valley angle)
β Valley angle

Claims (2)

In a paper feeding device that feeds at least one paper out of a plurality of papers stacked in a paper feeding unit by a feeding means and separates and feeds one paper by a separating means,
The feed roller of the feed means and the feed roller of the separation means are formed in an integral unit so that it can be detached from the paper feeder.
A bearing member disposed at both ends of the feed roller and at both ends of the feed roller, and rotatably holding the rotation shaft of the feed roller and the rotation shaft of the feed roller;
A holding member for supporting both ends of the feed roller and the feed roller by holding the bearing member at a notch, and
A paper feeding device comprising: In a paper feeding device that feeds a plurality of sheets stacked on a paper feeding unit by a feeding unit and separates and feeds one sheet by a separating unit,
The separation means includes a feed roller that is driven to rotate in the forward direction, a winding roller that is driven to rotate in the reverse direction and presses against the feed roller via the paper, and a rotation support that supports the winding roller in a swingable manner and is connected to a drive source. A shaft, and a torque limiter provided on the rotating support shaft,
In addition, an angle formed by a common normal line connecting the center of the roller and the rotation center of the feed roller and a common normal line connecting the center of the roller and the rotation spindle is within a range of 90 ° ± 12 °. A paper feeder characterized by being set to

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