CN104097962A - Sheet feeding device and image forming apparatus - Google Patents
Sheet feeding device and image forming apparatus Download PDFInfo
- Publication number
- CN104097962A CN104097962A CN201410039765.6A CN201410039765A CN104097962A CN 104097962 A CN104097962 A CN 104097962A CN 201410039765 A CN201410039765 A CN 201410039765A CN 104097962 A CN104097962 A CN 104097962A
- Authority
- CN
- China
- Prior art keywords
- resistance component
- supply member
- sheet material
- roller
- described resistance
- 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.)
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H5/00—Feeding articles separated from piles; Feeding articles to machines
- B65H5/06—Feeding articles separated from piles; Feeding articles to machines by rollers or balls, e.g. between rollers
- B65H5/062—Feeding articles separated from piles; Feeding articles to machines by rollers or balls, e.g. between rollers between rollers or balls
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- 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
- B65H3/0638—Construction of the rollers or like rotary separators
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H3/00—Separating articles from piles
- B65H3/46—Supplementary devices or measures to assist separation or prevent double feed
- B65H3/52—Friction retainers acting on under or rear side of article being separated
- B65H3/5207—Non-driven retainers, e.g. movable retainers being moved by the motion of the article
- B65H3/5215—Non-driven retainers, e.g. movable retainers being moved by the motion of the article the retainers positioned under articles separated from the top of the pile
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2404/00—Parts for transporting or guiding the handled material
- B65H2404/10—Rollers
- B65H2404/11—Details of cross-section or profile
- B65H2404/111—Details of cross-section or profile shape
- B65H2404/1113—C-shape
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2404/00—Parts for transporting or guiding the handled material
- B65H2404/10—Rollers
- B65H2404/11—Details of cross-section or profile
- B65H2404/114—Built-up elements
- B65H2404/1141—Built-up elements covering a part of the periphery
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2404/00—Parts for transporting or guiding the handled material
- B65H2404/10—Rollers
- B65H2404/14—Roller pairs
- B65H2404/144—Roller pairs with relative movement of the rollers to / from each other
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
- B65H2511/20—Location in space
- B65H2511/21—Angle
- B65H2511/212—Rotary position
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
- B65H2511/50—Occurence
- B65H2511/52—Defective operating conditions
- B65H2511/524—Multiple articles, e.g. double feed
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2701/00—Handled material; Storage means
- B65H2701/10—Handled articles or webs
- B65H2701/19—Specific article or web
- B65H2701/1912—Banknotes, bills and cheques or the like
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2801/00—Application field
- B65H2801/03—Image reproduction devices
- B65H2801/06—Office-type machines, e.g. photocopiers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2801/00—Application field
- B65H2801/39—Scanning
Abstract
The invention discloses a sheet feeding device and an image forming apparatus. The sheet feeding device includes a feeding member that rotates and feeds a sheet; a resistance member that contacts the feeding member with the sheet interposed therebetween, the resistance member contacting the sheet fed by the feeding member and applying a resistance against the feeding of the sheet; a holding unit that holds the resistance member so that the resistance member is movable to a position where the resistance member does not contact the feeding member; and an urging unit that urges the resistance member held by the holding unit in a direction opposite to a feeding direction of the sheet.
Description
Technical field
The present invention relates to a kind of sheet feeding device and image processing system.
Background technology
TOHKEMY discloses a kind of paper supply separation device for No. 2007-254092, and it comprises paper feed roller and friction pad.The outer surface of paper feed roller is pressed on the upper surface of the top a piece of paper in stack paper in the push plate of carton at the downstream end place of paper sheet stacking.Friction pad is arranged on the below of paper feed roller with relative with paper feed roller, and described uppermost paper is put therebetween.In this mechanism, friction pad is urged in the direction relative with paper conveyance direction by helical spring thrust pressure.
TOHKEMY discloses a kind of sheet feeding device No. 2011-016638, and it comprises feeding sheet materials roller and separate roller.Feeding sheet materials roller is for supplying with the sheet material that is stored in sheet material container.Separate roller be configured to can with the direction of feeding sheet materials opposite direction on be rotated, and form pressure contact with feeding sheet materials roller and separate occlusion portion to form, wherein said sheet material is separated from one another between feeding sheet materials roller and separate roller.Separate roller also can be rotated by the rotation of feeding sheet materials roller.In described device, in the time that feeding sheet materials process starts, overcome the power that torsion-coil spring applies, the donor rollers that separate roller is rotated up in feeding sheet materials side is rotated the first scheduled volume.In the time that feeding sheet materials process completes, by torsion-coil spring, separate roller rotates the first scheduled volume on sheet material Return-ing direction, and donor rollers is rotated together with separate roller on paper Return-ing direction.
TOHKEMY discloses a kind of sheet element feeding mechanism for No. 2011-195335, and it comprises separate roller, and it is with the common rotation of donor rollers, sheet element is separated from one another in contacting with donor rollers that this separate roller is scheduled to idle running load by warp.Described separate roller is equipped with torque limiter and retracing spring, and this torque limiter generates described idle running load, and this retracing spring applies turning effort to separate roller rotating member on Return-ing direction.In this device, in the time that sheet element supply process starts, torsional deflection is applied in retracing spring.In the time there is two supply of sheet element, described separate roller rotating member rotates in reverse directions by the rotational force of the torsional deflection generation by retracing spring, thereby the sheet element of two supplies is returned.
Japanese kokai publication hei discloses a kind of sheet element feeding mechanism for No. 11-349167, and it comprises: separate roller, and this separate roller has great friction coefficient part and low-friction coefficient part on its outer surface; Paper feed roller, this paper feed roller is rotated by motor; And rotatable guide reel, the radius of this rotatable guide reel is less than the radius of paper feed roller.Described paper feed roller is arranged to relative with separate roller with described guide reel.In this device, when a piece of paper being transmitted by donor rollers pulls second paper, thereby when second paper is also transmitted, the front end of second paper contacts with great friction coefficient part, and prevents from being transmitted further.After a piece of paper leaves separate roller, described second paper immediately separated roller pushes back towards stripper plate, and this separate roller is pushed by coil spring.
Summary of the invention
Even if the object of the invention is in the time that the skin resistance of resistance component changes, also can reduce the two generations of supplying with of sheet material.
According to a first aspect of the invention, provide a kind of sheet feeding device, it comprises: the supply member that rotates and supply with sheet material; Resistance component, described resistance component contacts with described supply member, and described sheet material is folded in described resistance component and described supply member between the two, and described resistance component contacts with the sheet material of supplying with by described supply member and applies resistance with respect to the supply of described sheet material; Holding unit, described holding unit keeps resistance component, makes described resistance component be movable to the position that described resistance component does not contact with described supply member; And pushing unit, described pushing unit with the direction of described feeding sheet materials opposite direction on the described resistance component that kept by described holding unit of pushing.
According to a second aspect of the invention, curved in cross-sectional plane towards the surface of the described resistance component of described supply member.Described resistance component is rotatably kept by described holding unit, and described pushing unit is spring, and it applies rotational force to described resistance component.
According to a third aspect of the invention we, described resistance component comprises flat surfaces, and its supply with respect to described sheet material applies resistance.
According to a forth aspect of the invention, described retaining member comprises pivot point, and described pivot point is located so that in the time that described resistance component applies resistance to described sheet material, and the contact force between described supply member and described resistance component increases.
According to a fifth aspect of the invention, before described supply member rotation, described supply member and described resistance component do not contact each other.
According to a sixth aspect of the invention, described pushing unit is arranged in each side of the middle section on Width of described resistance component or the described middle section on Width, and described Width intersects with the moving direction of described resistance component.
According to a seventh aspect of the invention, in the time that single sheet material is engaged between described supply member and described resistance component, described resistance component overcomes the thrust pressure being applied by described pushing unit and moves to the position that described resistance component does not contact with described supply member.
According to an eighth aspect of the invention, in the situation that single sheet material is engaged between described supply member and described resistance component, when Np is the pressure of described resistance component with respect to described supply member extruded sheet, and when μ is the friction coefficient of described resistance component, put in a direction of feed the power Fp=Np × μ of described resistance component by single sheet material.When Fr is going up in the opposite direction while putting on the thrust pressure on described resistance component by described pushing unit with the supplying party of described sheet material, meet Fp>Fr.
According to a ninth aspect of the invention, a kind of image processing system, comprising: according to the sheet feeding device described in either side in the above-mentioned first to the 7th aspect, and on the sheet material of being supplied with by described sheet feeding device, form the image formation unit of image.
According to a first aspect of the invention, even in the time that the skin resistance of described resistance component changes, compare with the situation that described supply member is not separated from one another with described resistance component, can make two being minimized of supplying with of sheet material.
According to a second aspect of the invention, even in the time that the skin resistance of described resistance component changes, can make the reduction of feeding sheet materials performance be less than the reduction of feeding sheet materials performance in the situation that not separated from one another at described supply member and described resistance component.
According to a third aspect of the invention we, even in the time that the skin resistance of described resistance component changes, can make the reduction of feeding sheet materials performance be less than the reduction of feeding sheet materials performance in the situation that not separated from one another at described supply member and described resistance component.
According to a forth aspect of the invention, compared with in situation that described in the time that described resistance component applies resistance to described sheet material, the contact force between supply member and described resistance component does not increase, can make two generations of supplying with of sheet material lower.
According to a fifth aspect of the invention, before being rotated with at described supply member, described supply member is compared with the situation that described resistance component contacts each other, can make two generations of supplying with of sheet material lower.
According to a sixth aspect of the invention, one side of the middle section on Width that is only arranged on described resistance component with described pushing unit compared with, can make two generations of supplying with of sheet material lower.
According to a seventh aspect of the invention, do not overcome with described resistance component the thrust pressure being applied by described pushing unit and move to compared with the situation of the position that described resistance component do not contact with described supply member, can make two generations of supplying with of sheet material lower.
According to an eighth aspect of the invention, compared with in the situation of Fp≤Fr, can make two generations of supplying with of sheet material lower.
According to a ninth aspect of the invention, do not comprise according to compared with the situation of the sheet feeding device described in the first to the 7th aspect with described image processing system, can make image due to supplying with because sheet material is two form the generation of operation failure lower.
Brief description of the drawings
Below, by reference to the accompanying drawings exemplary embodiment of the present invention is elaborated, wherein:
Fig. 1 illustrates according to the structure of the image forming apparatus of exemplary embodiment of the present invention;
Fig. 2 is according to the lateral plan of the feedway of exemplary embodiment of the present invention;
Fig. 3 is the transparent view of a part for the feedway shown in Fig. 1;
Fig. 4 is the transparent view of the resistance roller that comprises of the feedway shown in Fig. 1;
Fig. 5 is the lateral plan of the feedway shown in Fig. 1 under the state after recording medium supply process has just started;
Fig. 6 is the lateral plan of feedway the state having transmitted from the state shown in Fig. 5 at recording medium;
Fig. 7 is according to the summary side elevation of the feedway of the first variation;
Fig. 8 A is according to the summary side elevation of the feedway of the second variation;
Fig. 8 B is the lateral plan of feedway under the state being supplied at recording medium; And
Fig. 9 illustrates the schematic diagram of attempting the power of rotational resistance roller and put on the relation between the power of resistance roller by recording medium on direction of the supply S.
Detailed description of the invention
Below, the image forming apparatus according to exemplary embodiment of the present invention is described.
< integral structure >
First, to describing according to the structure of the image forming apparatus 10 of this exemplary embodiment.Fig. 1 is schematically illustrated according to the structure of the image forming apparatus 10 of this exemplary embodiment.Arrow UP in Fig. 1 represents vertical direction upwards.
Image forming apparatus 10 according to this exemplary embodiment as shown in Figure 1 is included in the image forming apparatus main body 11 of wherein holding various assemblies.This image forming apparatus main body 11 is held: container 12, and it is stored as the sheet-shaped recording medium P of the sheet materials such as recording paper and OHP sheet; Image forming portion 14, it forms image on recording medium P; Feedway 100, it supplies with sheet-shaped recording medium P from described container 12; Delivery unit 16, the recording medium P having supplied with is sent to image forming portion 14 by it; And controller 20, it is for controlling the operation of each assembly of image forming apparatus 10.Deliverying unit 18 is arranged on the top of described image forming apparatus main body 11, and the recording medium P that is formed with image by image forming portion 14 is thereon discharged to deliverying unit 18.
Described image forming portion 14 is represented by 22Y to 22K below comprising image formation unit 22Y, 22M, 22C and 22K(), it forms respectively respective color separately, i.e. the toner image of yellow (Y), magenta (M), bluish-green (C) and black (B); Intermediate transfer belt 24, the toner image being formed by image formation unit 22Y to 22K is transferred on it; Primary transfer roller 26, the toner image being formed by image formation unit 22Y to 22K is transferred to intermediate transfer belt 22 by it; And secondary transfer roller 28, it is transferred to from intermediate transfer belt 24 toner image being transferred on intermediate transfer belt 24 by primary transfer roller 26 recording medium P.The structure of described image forming portion 14 is not limited to said structure, upper as long as image can be formed at described recording medium P.
Image formation unit 22Y to 22K, in the middle section setting adjacent one another are in vertical direction of image forming apparatus main body 11, tilts with respect to horizontal direction simultaneously.Each image formation unit 22Y to 22K is included in the photosensitive material 32 of (for example, the clockwise direction in Fig. 1) upper rotation on specific direction.Because image formation unit 22Y to 22K has similar structure, so the assembly of image formation unit 22M, 22C and 22K does not represent with Reference numeral in Fig. 1.
Charging roller 23, exposure device 36, developing apparatus 38 and removal member 40 are arranged on around each photosensitive material 32 according to this order on the hand of rotation of described photosensitive material 32 from upstream side.Described charging roller 23 is examples for charging unit that photosensitive material 32 is charged.Described exposure device 36 carries out exposure process to form electrostatic latent image on described photosensitive material 32 on the photosensitive material 32 being charged by charging roller 23.Described developing apparatus 38 develops to form toner image to the electrostatic latent image being formed on photosensitive material 32 by exposure device 36.Described removal member 40 contacts and removes with photosensitive material 32 toner remaining on photosensitive material 32.
Described exposure device 36 forms electrostatic latent image based on the picture signal of transmitting from controller 20.The picture signal of transmitting from controller 20 can be for example, to transfer to the picture signal of controller 20 from external device (ED).
Described developing apparatus 38 comprises to the developer supplying unit 38A of photosensitive material 32 supply developers and multiple transmission member 38B, and the developer that described multiple transmission member 38B will supply with in stirring developer is sent to developer supplying unit 38A.
Described intermediate transfer belt 24 in the form of a ring, and is positioned on image formation unit 22Y to 22K.Draw roll 42 and 44 is arranged on the inside of described intermediate transfer belt 24, and described intermediate transfer belt 24 is wound around around described draw roll.In the time that one of them of draw roll 42 and draw roll 44 is rotated, intermediate transfer belt 24 is (for example, the clockwise direction in Fig. 1) mobile (rotation) on specific direction in contacting with photosensitive material 32.Described draw roll 42 is as opposed roller, and it is relative with secondary transfer roller 28.
Described primary transfer roller 26 is relative with each photosensitive material 32, and intermediate transfer belt 24 is interposed in described primary transfer roller 26 and described each photosensitive material 32 between the two.Each position between primary transfer roller 26 and photosensitive material 32 is as primary transfer position, and the toner image being wherein formed on described photosensitive material 32 is transferred on intermediate transfer belt 24.
Described secondary transfer roller 28 is relative with draw roll 42, and intermediate transfer belt 24 is interposed in described secondary transfer roller 28 and described draw roll 42 between the two.Position between secondary transfer roller 28 and draw roll 42 is as secondary transfer printing position, and the toner image being wherein transferred on intermediate transfer belt 24 is transferred on recording medium P.
Described feedway 100 is configured to being stored in sheet-shaped recording medium P in container 12 separated from one another, and they are supplied to delivery unit 16 one by one, to avoid that two or more recording medium P are supplied to delivery unit 16 simultaneously.Below, described feedway 100 is elaborated.
Described delivery unit 16 comprises: transfer path 48, and each recording medium P is transmitted along described transfer path 48; And multiple transfer rollers 50, it is set to, along transfer path 48, recording medium P is sent to secondary transfer printing position.
Described image forming apparatus main body 11 is accommodated fixing device 60 at the downstream position of secondary transfer printing position on direction of transfer.Described fixing device 60 will be transferred to toner image on recording medium P to recording medium P by secondary transfer roller 28.In manufacturing process, described fixing device 60 can be installed in image forming apparatus main body 11 and dismounting from it, but can not be dismantled by user.Described fixing device 60 comprises distributing roller 52, and the recording medium P with photographic fixing toner image is thereon expelled to deliverying unit 18 by it.
Described fixing device 60 comprises warm-up mill 64 and press belt 66, and it is as the example of fixing member, for by toner image to recording medium P.
Described warm-up mill 64 comprises: cylindrical member 64A, its in fixing device 60 by rotatable support; And thermal source 64B, as halide torch, it is arranged in the inner space of cylindrical member 64A.Described press belt 66 ringwise, and press belt 66 with respect to the position of warm-up mill 64 in fixing device 60 by rotatable support.
Described warm-up mill 64 and described press belt 66 are around rotation axis direction rotation, the Width (being designated hereinafter simply as Width) that described rotation axis direction is recording medium P, its direction of transfer perpendicular to recording medium P (being designated hereinafter simply as direction of transfer), and extend on Width.
When warm-up mill 64 rotates and when press belt 66 rotates by the rotation of backer roll 64, the recording medium P that has been transferred toner image on it is transmitted in being engaged between warm-up mill 64 and press belt 66.Heated roller 64 heating of toner on the recording medium P being transmitted in being engaged between warm-up mill 64 and press belt 66 are also pressurizedly with 66 pressurizations, thus image by photographic fixing to recording medium P.
Described fixing device 60 has a pair of distributing roller 52, for recording medium P is expelled to deliverying unit 18 from fixing device 60, on described recording medium P, has toner image by warm-up mill 64 and press belt 66 photographic fixing.Described a pair of distributing roller 52 comprises driven voller 52A and is arranged on the driven roller 52B below driven voller 52A.
Described image forming apparatus main body 11 comprises reversion transfer path 70, for utilizing multiple transfer rollers 50 that the recording medium P that is formed with image in one side is back to transfer position (image formation position), so that image is formed on the both sides of described recording medium P.
Described fixing device 60 comprises introduces path 49, and it has the recording medium P of image to guide to reversion transfer path 70 photographic fixing thereon.Introducing path 49 is configured to the recording medium P that the contrarotation by distributing roller 52 is transmitted rearward and on it, photographic fixing has image is directed to reversion transfer path 70.Thus, in image forming apparatus 10, the recording medium P that is formed with image in one side can be inverted and turn back to transfer path 48 by introducing path 49 with reversion transfer path 70.
< image forms operation >
Then, to forming operation and describe by the image on recording medium P that image is formed on carrying out according to the image forming apparatus 10 of this exemplary embodiment.
According in the image forming apparatus 10 of this exemplary embodiment, recording medium P supplies with from container 12 by feedway 100, and is sent to secondary transfer printing position by transfer roller 50.
In each image formation unit 22Y to 22K, described photosensitive material 32 charges by charging roller 23 and is exposed by exposure device 36, thereby electrostatic latent image is formed on described photosensitive material 32.Described electrostatic latent image develops by developing apparatus 38, thereby toner image is formed on photosensitive material 32.The toner image of the color separately being formed by image formation unit 22Y to 22K is transferred on intermediate transfer belt 24 in primary transfer position in the mode of stack, thereby forms coloured image.The coloured image being formed on intermediate transfer belt 24 is transferred on recording medium P in secondary transfer printing position.
On it, transfer printing has the recording medium P of toner image to be transferred into fixing device 60, and described toner image by fixing device 60 by photographic fixing to recording medium P.In the time image only will being formed to a side of described recording medium P, after toner image is by photographic fixing, by distributing roller 52, recording medium P is expelled to deliverying unit 18.
In the time image will being formed to the both sides of recording medium P, the recording medium P that a side has been formed with image is thereon transferred into reversion transfer path 70 by the contrarotation of distributing roller 52 from introducing path 49.Then, described recording medium P is transferred into transfer path 48 from reversion transfer path 70, and by process similar to the above process, on the opposite side of described recording medium P, forms image.Thus, image is formed at the both sides of described recording medium P.Thus, complete image and form operation.
< feedway >
Below, described feedway 100 is described.Fig. 2 be illustrate recording medium P be supplied to before or after the lateral plan of state, Fig. 5 and Fig. 6 are the lateral plans of the state that illustrates that recording medium P is being supplied to.
As shown in Figure 2, described feedway 100 comprises the donor rollers 110 that is arranged at top, and is arranged at bottom with the resistance roller 120 relative with described donor rollers 110.The rotation axis direction of these rollers can be called Width sometimes.As shown in Figure 5, for example, recording medium P is supplied to the direction that roller 110 supplies with and is restricted to direction of the supply S.
Described donor rollers 110 is that D shape (half moon) and its outer surface carry out chamfering (D-cutting) to form flat part substantially.Described flat part is called as D-cutting part 114.The supply member 112 of being made up of rubber etc. is arranged on the outer surface in the region except D-cutting part 114 of described donor rollers 110.Described donor rollers 110 can be rotated by driver train (not shown) in the direction of arrow K1.
Swivel mount (not shown) is arranged on the both sides of described donor rollers 110.The diameter of described swivel mount is less than the diameter of described donor rollers 110, and is configured to described supply member 112 and described resistance roller 120 under the state preventing before recording medium P is supplied to and afterwards and contacts with each other.Described swivel mount (not shown), by molded resin, forms as POM.
As shown in Figures 2 and 3, described resistance roller 120 passes through retaining member 150 by rotatable support.The downstream position broad ways of axial region 152 on direction of the supply S is arranged on the both sides of retaining member 150.Described retaining member 150 by axial region 152 rotary supports on shell (not shown) etc.
As shown in Figure 2, coil spring 154 is arranged on the below of retaining member 150.The bottom of described coil spring 154 is fixed on shell (not shown) etc.Described retaining member 150 pushes to rotate around axial region 152 by the thrust pressure of coil spring 154.Thus, the resistance roller 120 being kept by retaining member 150 is pushed towards donor rollers 110.Retainer (not shown) is arranged so that the desired location that is rotated in of described retaining member 150 stops.
With reference to Fig. 5, in the time that described donor rollers 110 rotates up in the side of arrow K1, contact puts on the contact portion (being designated hereinafter simply as bite N) between the supply member 112 of donor rollers 110 and the resistance component 130 of resistance roller 120 by the thrust pressure of coil spring 154.
The axial region 152 of retaining member 150 is constructed so that the thrust pressure that puts on the resistance roller 120 being kept by retaining member 150 in the time that resistance component 130 contacts with the supply member 112 of donor rollers 110 is greater than the thrust pressure in the time that resistance component 130 does not also contact with the supply member 112 of donor rollers 110.In other words, the axial region 152 of described retaining member 150 is positioned such that in the time that described resistance component 130 applies resistance to recording medium P, the contact force increase between described supply member 112 and described resistance component 130.
As shown in Figures 2 to 4, described resistance roller 120 comprises roller main body 122 and resistance component 130, described roller main body 122 is by the rotatable maintenance of retaining member 150 (being shown in Fig. 2 and Fig. 3), and described resistance component 130 is made and is arranged on by rubber in the part of periphery of described roller main body 122 with relative with described donor rollers 110.Described resistance component 130 is curved in lateral plan.
The projection 126 and the S. A. 124(that are rotatably supported by retaining member 150 are shown in Fig. 2 and Fig. 3) be arranged on described resistance roller 120(roller main body 122) the each end on Width.Described resistance roller 120 is kept by retaining member 150, in the direction with the direction at arrow K2 and arrow K3, is rotatable.
Be configured to make described resistance component 130 end 132 in a direction of feed can not cross bite N(between described resistance roller 120 and described donor rollers 110 with reference to Fig. 5 at the rotating range (mobile range) of the resistance component 130 of the upper described resistance roller 120 towards upstream side of the direction of the supply (direction of arrow K3)).In other words, the rotation of the described resistance rod 120 in arrow K3 direction is by being stopped at the retainer (not shown) of position as shown in Figure 2.Even in the time that described resistance roller 120 rotates up in the side of arrow K3, described donor rollers 110 and resistance roller 120 can be not separated from one another.
The bite N(that (see figure 6) between described resistance roller 120 and described donor rollers 110 is crossed in the end 134 that is configured to the described resistance component 130 that makes the end in the relative direction of the supply at the rotating range (mobile range) of the resistance component 130 of the upper described resistance roller 120 towards downstream of the direction of the supply (direction of arrow K2) is shown in Fig. 5).In other words, described resistance roller 120 is kept by retaining member 150, so that described resistance roller 120 rotates up until the end of the resistance component 130 of described resistance roller 120 end, upstream 134(arrow K3 direction in a direction of feed in the side of arrow K2) cross described resistance roller 120 and described donor rollers 110(is shown in Fig. 6) between bite N(see Fig. 5).
As shown in Figures 2 and 3, torsion-coil spring 140 is arranged on described resistance roller 120(roller main body 122) S. A. 124 on.An end 142 of described torsion-coil spring 140 is wound around around described projection 126, and the other end 146 of described torsion-coil spring 140 is kept by the maintaining part 156 of described retaining member 150.Thus, described resistance roller 120 is urged with in the direction at arrow K3, rotates up in the side contrary with direction of the supply S.Described resistance roller 120 receives the moment of torsion in arrow K3 direction (direction contrary with direction of the supply S) from torsion-coil spring 140.
Although, on Width (axially) only a side shown in Fig. 2 and Fig. 3, at the structural similitude of structure and the illustrated side of opposite side, and be provided with S. A. 124, projection 126, torsion-coil spring 140 and maintaining part 156.More specifically, described torsion-coil spring 140 is arranged on the described resistance roller 120(resistance component 130 of (axially) on Width) each end.
< operates >
Below, the operation of this exemplary embodiment is described.
As shown in Figure 5, in the time being substantially the donor rollers 110 of D shape (half moon) and rotating, under stacked state, one of the top of described recording medium P is supplied to.
As mentioned above, biting pressure puts on the bite N between the supply member 112 of donor rollers 110 and the resistance component 130 of resistance roller 120 by the thrust pressure of coil spring 154.In addition due to the thrust pressure of described torsion-coil spring 140, resistance component 130 described in described resistance roller 120() be received in arrow K3 direction (with supplying party in the opposite direction) on moment of torsion.
In the time that single recording medium P supplies with by donor rollers 110, resistance roller 120(resistance component 130) be received in the rotational force in arrow K2 direction by recording medium P, and overcome described torsion-coil spring 140 thrust pressure and in the upper rotation of arrow K2 direction (direction of the supply).
With reference to Fig. 9, the biting pressure that the resistance component 130 that is the resistance roller 120 of the supply member 112 of the described donor rollers 110 of extruding as Np applies, μ is the friction coefficient of the resistance component 130 of described resistance roller 120, r is the radius of described resistance roller 120, and when T is the moment of torsion of described torsion-coil spring 140, the power Fr that attempts to rotate up in arrow K3 side described resistance roller 120 calculates by Fr=T/r.
On direction of the supply S, put on described resistance roller 120(resistance component 130 by recording medium P) power Fp calculate by Fp=Np × μ.
For transmission log medium P, that is, for resistance roller 120 is rotated up in arrow K2 side, need to meet Fp>Fr.
Described image forming apparatus 10 is designed such that, as long as described recording medium P is the type that can be printed by image forming apparatus 10, will meet so Fp>Fr.
As shown in Figure 6, when the end 134 of the resistance component 130 of resistance roller 120 arrow K3 direction (with supplying party in the opposite direction) on while crossing bite N, described resistance roller 120 is rotated by the thrust pressure of described torsion-coil spring 140 in the direction of arrow K3, makes end 134 be back to bite N.But, due to the friction force between recording medium P and resistance component 130, described resistance roller 120 immediately in the direction of arrow K2 (direction of the supply) again rotate, make the end 134 of the resistance component 130 of described resistance roller 120 cross bite N.In other words, the end 134 of resistance component 130 is repeatedly crossed bite N and is back to the little motion of bite N().
At multiple recording medium P, by donor rollers 110 supply with together in the situation that (in two supply in the situation that), the top recording medium P contacting with the supply member 112 of described donor rollers 110 is transmitted further by described donor rollers 110.Because the friction drag between recording medium P is smaller, one or more recording medium P below top recording medium P due to attempt direction at arrow K3 (with supplying party in the opposite direction) the transmission load (transmission resistance) of the resistance component 130 of the described resistance roller 120 of upper rotation stops, and by the direction at arrow K3 to pusher.Recording medium P below top recording medium P is pushed back towards the downstream of the direction of the supply and crosses bite N.Thus, described recording medium P separated from one another and only top recording medium P be supplied to delivery unit 16(and see Fig. 1).As mentioned above, image forming apparatus 10 is designed to meet Fp>Fr.Therefore,, as long as recording medium P is the type that can be printed by image forming apparatus 10, bite N is just crossed in the end 134 of the resistance component 130 of described resistance roller 120.
As mentioned above, according in the feedway 100 of this exemplary embodiment, the thrust pressure (spring force) of described torsion-coil spring 140 is as the transmission load (transmission resistance) putting on recording medium P.Therefore, described transmission load (transmission resistance) can be limited by the thrust pressure of torsion-coil spring 140 (spring force).Therefore, even in the time that the surface of resistance component 130 has dust attached thereto etc., the situation (in the situation that transmission load (transmission resistance) is limited with biting pressure by friction drag) being fixed with resistance component is compared, and transmits load (transmission resistance) and changes less amount.In other words, the supply of recording medium P failure, two supplies etc. can be prevented from or suppress.
Torsion-coil spring 140 is arranged on resistance roller 120(resistance component 130) each end of (axially) on Width.Therefore, compared with the situation that is only arranged on an end on Width with torsion-coil spring 140, the variation that (axially) transmits load on Width is reduced (making to transmit load even).
Torsion-coil spring can be arranged on the inside of resistance roller.Even if the both sides that in this case, described spring (pushing unit) is arranged on middle section on Width (axially) are to reduce to transmit load variation vertically.Or described spring (pushing unit) can only be arranged on the middle section of (axially) on Width.In the setting of multiple resistance roller, in the axial direction in the situation that, spring (pushing unit) can be arranged between resistance roller.
In the time that the supply process of being undertaken by donor rollers 110 completes,, in the time that the D-of donor rollers 110 cutting part 114 is positioned at towards described resistance roller 120, described resistance roller 120 rotates up in the side of arrow K3 by the thrust pressure of torsion-coil spring 140, and be back to initial position, as shown in Figure 2.As a result, separated with top recording medium P and the recording medium P that retains near the position downstream end of bite N is in a direction of feed pushed back in arrow K3 direction.Thus, from desired location, the displacement of (regular position) can be inhibited recording medium P.
Next consider comparative example, wherein the mobile range of the end 134 of the resistance component 130 of resistance roller 120 (rotatable scope) is configured to make end 134 not cross bite N.
In the time that donor rollers 110 is rotated, recording medium P is supplied to and resistance roller 120 is also rotated.In the time that the end 134 of the resistance component 130 in arrow K3 direction stopped before it crosses bite N, the biting pressure of friction force and resistance component 130, instead of the thrust pressure of torsion-coil spring 140, as transmitting load (transmission resistance).This situation about being fixed with described resistance component (transmitting the situation that load (transmission resistance) is limited by friction force and biting pressure) is identical, and the thrust pressure of torsion-coil spring 140 (spring force) is as putting on the transmission load (transmission resistance) on recording medium P.
In this exemplary embodiment, as mentioned above, be configured to make cross in the end 134 relative with end in the direction of the supply bite N(between resistance roller 120 and donor rollers 110 with reference to Fig. 2 towards the rotating range of the resistance component 130 of the resistance roller 120 of the upstream side of the direction of the supply (in the direction of arrow K2)).Therefore, the thrust pressure of torsion-coil spring 140 (spring force) is as putting on the transmission load (transmission resistance) on recording medium P.
< variation >
Below, the variation to this exemplary embodiment is described.
< the first variation >
In above-mentioned exemplary embodiment, described pushing unit is torsion-coil spring 140, its with supplying party in the opposite direction on the resistance roller 120 that kept by described retaining member 150 of pushing.But described pushing unit is not limited to this.
For example, according in the feedway 190 of the first variation as shown in Figure 7, extension coil spring 141 can be set, with the direction rotation resistance roller 121 at arrow K3, the end hook of described extension coil spring 141 is in projection 127.Or Compress Spring or laminated spring can be as pushing unit.Or, can use the elastic component outside spring, as rubber.
< the second variation >
In above-mentioned exemplary embodiment, apply and transmit load (transmission resistance) by arc resistance component 130, this arc resistance component 130 is arranged in a part for roller main body 122 peripheries, and this roller main body 122 is rotatably kept by described retaining member 150, but is not limited to this.
For example, the present invention also can be applied to the situation that uses cushion resistance component.According in the feedway 200 of the second variation shown in Fig. 8 A and Fig. 8 B, the tabular resistance component 230 with flat surfaces is configured to along linear slide, and this resistance component 230 applies resistance to recording medium P.Described resistance component 230 compressed coil spring 240 in the direction of arrow J2 pushes.As shown in Figure 8 B, the mobile range of described resistance component 230 in arrow J1 direction (direction of the supply) is configured to make the end 234 of described resistance component 230 to move up and cross bite N in arrow J2 side.In the time that described recording medium P arrives bite N and is transmitted, the end 234 of described resistance component 230 is repeatedly crossed bite N and is back to the little motion of bite N().
Other > of <
The present invention is not limited to above-mentioned exemplary embodiment.
For example, the structure of described image forming apparatus is not limited to the structure of above-mentioned exemplary embodiment, and described image forming apparatus can have various structures.
In addition,, although image forming portion 14 forms image by electrophotographic method on recording medium P in above-mentioned exemplary embodiment, described image forming method is not limited to this.Can pass through additive method, as ink-jet method or thermal transfer, on recording medium P, form image.
In addition,, although the present invention is applied to the image forming apparatus that forms image on recording medium P in above-mentioned exemplary embodiment, the present invention is not limited to this.The present invention also can be applied to the equipment outside image forming apparatus, as image-reading device, ATM (Automatic Teller Machine) and cashier's machine.The present invention also can be applied to the feedway of any type separated from one another sheet material and that supply with one by one.
In addition, within the scope of the invention, obviously can there be various embodiment.
In order to illustrate and to illustrate, above exemplary embodiment of the present invention is described.Its object does not also lie in extensive and describes the present invention or limit the invention to disclosed concrete form.Obviously, for those skilled in the art, can make many amendments and distortion.The selection of the present embodiment and description, its object is to explain in the best way principle of the present invention and practical application thereof, thereby other those of skill in the art that make the art can understand various embodiment of the present invention, and make the various distortion that are applicable to special-purpose.Scope of the present invention is by limiting with claims of submitting to together with this specification sheets and equivalent thereof.
Claims (9)
1. a sheet feeding device, comprising:
Supply member, described supply member rotates and supplies with sheet material;
Resistance component, described resistance component contacts with described supply member, and described sheet material is folded in described resistance component and described supply member between the two, and described resistance component contacts with the sheet material of supplying with by described supply member and applies resistance with respect to the supply of described sheet material;
Holding unit, described holding unit keeps described resistance component, makes described resistance component be movable to the position that described resistance component does not contact with described supply member; And
Pushing unit, described pushing unit with the supplying party of described sheet material in the opposite direction on the described resistance component that keeps by described holding unit of pushing.
2. sheet feeding device according to claim 1, wherein:
Surface towards the described resistance component of described supply member is curved in cross-sectional plane,
Described resistance component is rotatably kept by described holding unit, and
Described pushing unit is spring, and it applies rotational force to described resistance component.
3. sheet feeding device according to claim 1, wherein:
Described resistance component comprises flat surfaces, and its supply with respect to described sheet material applies resistance.
4. sheet feeding device according to claim 2, wherein:
Described retaining member comprises pivot point, and
Described pivot point is located so that in the time that described resistance component applies resistance to described sheet material, the contact force increase between described supply member and described resistance component.
5. sheet feeding device according to claim 1, wherein:
Before described supply member rotation, described supply member and described resistance component do not contact with each other.
6. sheet feeding device according to claim 1, wherein:
Described pushing unit is arranged in each side of the middle section on Width of described resistance component or the described middle section on Width, and described Width intersects with the moving direction of described resistance component.
7. sheet feeding device according to claim 1, wherein:
In the time that single sheet material is engaged between described supply member and described resistance component, described resistance component overcomes the thrust pressure being applied by described pushing unit and moves to the position that described resistance component does not contact with described supply member.
8. according to the sheet feeding device described in any one in the claims 1 to 7, wherein:
In the situation that single sheet material is engaged between described supply member and described resistance component, when Np is described resistance component pushes described sheet material pressure with respect to described supply member, and when μ is the friction coefficient of described resistance component, put on the power Fp=Np × μ on described resistance component by described single sheet material in a direction of feed, and
When Fr is going up in the opposite direction while putting on the thrust pressure on described resistance component by described pushing unit with the supplying party of described sheet material, meet Fp>Fr.
9. an image processing system, comprising:
According to the sheet feeding device described in any one in claim 1 to 8; And
Image formation unit, described image formation unit forms image on the described sheet material of being supplied with by described sheet feeding device.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2013-085113 | 2013-04-15 | ||
| JP2013085113A JP2014205562A (en) | 2013-04-15 | 2013-04-15 | Sheet sending-out device and image formation device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104097962A true CN104097962A (en) | 2014-10-15 |
Family
ID=51666572
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410039765.6A Pending CN104097962A (en) | 2013-04-15 | 2014-01-27 | Sheet feeding device and image forming apparatus |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US20140306403A1 (en) |
| JP (1) | JP2014205562A (en) |
| CN (1) | CN104097962A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWM564585U (en) * | 2018-02-12 | 2018-08-01 | 崴強科技股份有限公司 | Paper pickup mechanism |
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| US3861670A (en) * | 1972-11-06 | 1975-01-21 | Xerox Corp | Sheet feeding apparatus |
| JPS6096334U (en) * | 1983-12-07 | 1985-07-01 | ミノルタ株式会社 | Paper feeding device |
| JPH0717286B2 (en) * | 1985-08-10 | 1995-03-01 | キヤノン株式会社 | Sheet feeding device |
| JPH0739291B2 (en) * | 1986-10-07 | 1995-05-01 | 沖電気工業株式会社 | Paper sheet separating and feeding device |
| JPH0218438U (en) * | 1988-07-22 | 1990-02-07 | ||
| JPH0742003B2 (en) * | 1988-11-28 | 1995-05-10 | 三田工業株式会社 | Double feed prevention paper feed device for image forming apparatus |
| JPH07209939A (en) * | 1994-01-14 | 1995-08-11 | Mita Ind Co Ltd | Paper feeding mechanism |
| JP2008239304A (en) * | 2007-03-28 | 2008-10-09 | Canon Inc | Sheet feeding device and image formation device |
| JP2010159110A (en) * | 2009-01-07 | 2010-07-22 | Fuji Electric Retail Systems Co Ltd | Bill treating device and money treating machine |
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- 2013-12-09 US US14/100,652 patent/US20140306403A1/en not_active Abandoned
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| US4526358A (en) * | 1981-06-09 | 1985-07-02 | Konishiroku Photo Industry Co., Ltd. | Paper feeding mechanism |
| JPS58224935A (en) * | 1982-06-18 | 1983-12-27 | Ricoh Co Ltd | Paper overlapping feed preventing device |
| JPH03115028A (en) * | 1989-09-28 | 1991-05-16 | Minolta Camera Co Ltd | Sheet supplying device |
| JP2002128304A (en) * | 2000-10-20 | 2002-05-09 | Nec Eng Ltd | Paper feeder |
| CN1439524A (en) * | 2002-02-18 | 2003-09-03 | 佳能株式会社 | Sheet feeder and recorder |
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| CN101021696A (en) * | 2006-02-15 | 2007-08-22 | 富士施乐株式会社 | Paper feeding device, control method thereof, image forming device, computer readable medium |
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Also Published As
| Publication number | Publication date |
|---|---|
| JP2014205562A (en) | 2014-10-30 |
| US20140306403A1 (en) | 2014-10-16 |
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