CN1849565A - Developing device and image forming device - Google Patents
Developing device and image forming device Download PDFInfo
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- CN1849565A CN1849565A CN 200480025948 CN200480025948A CN1849565A CN 1849565 A CN1849565 A CN 1849565A CN 200480025948 CN200480025948 CN 200480025948 CN 200480025948 A CN200480025948 A CN 200480025948A CN 1849565 A CN1849565 A CN 1849565A
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Abstract
The invention discloses a developing device, which comprises the following parts: developing rod, which possesses magnetic rod to transmit developing agent and develops electrostatic latent image; control part, which controls developing agent quantity from developing rod to electrostatic latent image; reflux board, which refluxes excessive developing agent out of control part, scraping and erasing part, which is set as the opposite surface developing rod of first gap and second gap limited by developing rod and control part and transmits the scraping and erasing to the developing agent of first gap, wherein the scraping and erasing part proceeds positive charging on the developing agent of initial charging.
Description
Technical field
The present invention relates to be used in such as the developing apparatus in the image processing system of the employing electrophotographic system of duplicating machine, printer and facsimile recorder, and relate to a kind of image processing system.
Background technology
Figure 13 is the sectional view of the structure of the existing developing apparatus of expression.Be used in such as the developing apparatus in the image processing system of the employing electrophotographic system of duplicating machine and comprise: have the magnetic roller 100 that transmits two-component developer and be used for developer roll 101 latent electrostatic image developing of photosensitive drums carrying; Be used to control the control piece 102 of amount that is sent to the developer of electrostatic latent image by developer roll 101; Be used to reflux and leave the back flow plate 103 of the excessive developer of control piece 102 by control piece 102 controls; The container 104 that includes developer; And the agitating roller 105 (for example referring to Japanese Patent Application Publication 1-237577 (1989)) that is used for the developer in the stirred vessel 104.
According to developing apparatus, be included in that binary carrier (Magnaglo) in the container 104 and toner are stirred by agitating roller 105 and toner adheres to the outer peripheral face of carrier with this structure.And, along with the sleeve 106 of developer roll 101 along rotating with the direction of the direction of rotation of photosensitive drums, the developer between developer roll 101 and the back flow plate 103 transmits and is sent to the amount of developer of electrostatic latent image by control piece 102 controls towards the gap.Developer by the gap is sent to electrostatic latent image.Accumulate in the gap between control piece 102 and the back flow plate 103 by the excessive developer of control piece 102 control.Along with the increase of accumulated amount, developer flows to the upper surface of back flow plate 103, by back flow plate 103 guiding, and towards the last side reflux of agitating roller 105.
As the developing apparatus that uses two-component developer, comprise the reflux unit of the upside that is used for to flow back into by the excessive developer of control piece control agitating roller and also be known (for example referring to Japanese Patent Application Publication 3-89273 (1991)) at the developing apparatus that an end of reflux unit has a back flow plate of folded part.
But, 1-237577 (1989) disclosed have wherein to be provided be used for the reflux developing apparatus of the structure of leaving control piece of excessive developer is had problems.Developer is sent to the gap and by initiatively tentatively not charged.Therefore, be sent to the carrier of the developer in gap has strong adhesion owing to the magnetic pull of magnetic roller 100 is in bonding state.The control of a part by control piece 102 that is in the developer of bonding state becomes excessive developer.Along with excessive developer increases, can produce the developer ball that is in bonding state.The downstream that the developer ball that increases is fallen back flow plate 103 owing to deadweight, and therefore, can not in container 104, form developer circulating path towards the developer replenishing unit.And the developer magnetic conductivity sensor On/Off number of times that is arranged on container bottom increases, thus the variation that has increased the developer carried charge.
Summary of the invention
The present invention has been proposed in light of this situation, and an object of the present invention is to provide a kind of developing apparatus and a kind of image processing system, by provide with greater than second clearance plane in first gap between developer roll and the control piece to developer roll and be used for being sent to the scraper member of the developer in first gap, the excessive developer that can reflux glibly and produce by control piece according to layer thickness control amount scraping (scraping friction).
Another object of the present invention provides a kind of developing apparatus and a kind of image processing system, be set to be in control piece one side, the steady state (SS) that can keep excessive developer can easily not mutually combine with respect to the position of 1.5 ° of the opposite side skews from the minimum position in second gap towards control piece by being included in one of magnetic pole in the magnetic roller in the face of the pole center axle of this magnetic pole of position in second gap.
Another object of the present invention provides a kind of developing apparatus and a kind of image processing system, by will be included in one of magnetic pole in the magnetic roller be set in the face of the pole center axle unanimity of this magnetic pole of position in second gap in the minimum position in second gap, the steady state (SS) that can keep excessive developer can easily not mutually combine.
Another object of the present invention provides a kind of developing apparatus and a kind of image processing system, be set to be in control piece one side, the steady state (SS) that can keep excessive developer can easily not mutually combine with respect to the minimum position in second gap by being included in one of magnetic pole in the magnetic roller in the face of the pole center axle of this magnetic pole of position in second gap.
Another object of the present invention provides a kind of developing apparatus and a kind of image processing system, limits second clearance G 2 by the relation according to the width D m of first clearance G, 1＜the second clearance G, 2≤0.8 * magnetic pole, so that tentatively charged effectively.
Another object of the present invention provides a kind of developing apparatus and a kind of image processing system, and the developer that gathers by near the developer that is provided for preventing being sent to the gap control piece and/or scraper member is detained and suppresses part, and developer glibly can circulate.
Another object of the present invention provides a kind of developing apparatus and a kind of image processing system, by scraper member and back flow plate are formed one, can reduce the skew towards the gap expansion direction of scraper member that the trail drag force by the scraping developer causes.
Another object of the present invention provides a kind of developing apparatus and a kind of image processing system, by being detained and suppressing the contact back flow plate to be set on the part and to prevent scraper member lobe portion being positioned near the control piece developer, can reduce the bending of scraper member that the trail drag force by the scraping developer causes towards the gap expansion direction.
Another object of the present invention provides a kind of developing apparatus and a kind of image processing system, by control piece and the scraper member with similar linear expansion coefficient is provided, can reduce the control piece that caused by temperature change and the degree of deformation difference of scraper member.
Another object of the present invention provides a kind of developing apparatus and a kind of image processing system, by supporting developer roll, control piece and scraper member by the common support part, can keep the exact position relation between developer roll, control piece and the scraper member.
Another object of the present invention provides a kind of developing apparatus and a kind of image processing system, be defined as the G2 of M2＞(M1/G1) by the developer level M2 that will be sent to second gap when the developer level that transmits from first gap during for M1, can be by preliminary charged increase internal circulating load.
Another object of the present invention provides a kind of developing apparatus and a kind of image processing system, be detained and suppress third space that part limits and be set at and be equal to or greater than 4.2mm by will and being positioned near the control piece developer, can reduce developer at third space round-robin resistance and prevent reducing of the developer internal circulating load that causes by the circulating path resistance by back flow plate.
Another object of the present invention provides a kind of developing apparatus and a kind of image processing system, by the third space greater than second gap is provided, can reduce developer at third space round-robin resistance and prevent reducing of the developer internal circulating load that causes by the circulating path resistance.
Another object of the present invention provides a kind of developing apparatus and a kind of image processing system, by the container of the developer that puts the toner that comprises the Magnaglo with the mean grain size that is less than or equal to 65 μ m and have the mean grain size that is less than or equal to 7.5 μ m is provided, can improve the reasonable toner density of developer and improve picture quality.
Comprise according to developing apparatus of the present invention and image processing system: developer roll, it has magnetic roller, is used to transmit developer and developing electrostatic latent image; Control piece is used to control the amount that is sent to the developer of electrostatic latent image by developer roll; And back flow plate, be used for and will leave control piece by the excessive developer backflow of control piece control.Developing apparatus comprises scraper member, its be set to greater than second clearance plane in first gap between developer roll and the control piece to developer roll, and scraping is sent to the developer in first gap.
According to the present invention, because second gap greater than first gap, is therefore formed excessive developer and can be formed excessive developer circulating path by control piece certainly.In addition, before developer was sent to first gap, the bed thickness of scraper member control developer promptly provided the scraping friction to swipe, and carries out tentatively charged on developer.Therefore, when developer was two-component developer, the repulsion that is produced by control piece acted on excessive developer.Adhesion in the developer can be reduced and developer mutually combines hardly by repulsion.Therefore, the excessive developer that is produced by control piece is refluxed towards back flow plate glibly, and developer begins side reflux by back flow plate towards circulation, and developer can circulate glibly.
Be characterised in that according to developing apparatus of the present invention and image processing system, magnetic roller has a plurality of magnetic poles that are provided with along its circumferencial direction, and one of magnetic pole is set in the face of the position in second gap, and the pole center axle of this magnetic pole is in control piece one side with respect to the position of 1.5 ° of the opposite side skews from the minimum position in second gap towards control piece.
According to the present invention, because the pole center axle of magnetic pole is positioned at the opposite side that is in control piece from the minimum position in second gap, therefore being sent to the excessive developer that the developer conveying capacity in second gap itself can be reduced and be produced by control piece can be reduced.Therefore, excessive developer can remain on the state that developer mutually combines hardly.
Be characterised in that according to developing apparatus of the present invention and image processing system, magnetic roller has a plurality of magnetic poles that are provided with along its circumferencial direction, and one of magnetic pole is set in the position in the face of second gap, and the pole center axle unanimity of this magnetic pole is in the minimum position in second gap.
According to the present invention, the developer conveying capacity in second gap increases too much and the excessive developer that produced by control piece can remain on the state that developer mutually combines hardly because the pole center axle unanimity of magnetic pole in the minimum position in second gap, therefore prevents to be sent to.
Be characterised in that according to developing apparatus of the present invention and image processing system, magnetic roller has a plurality of magnetic poles that are provided with along its circumferencial direction, and one of magnetic pole is set in the position in the face of second gap, and the pole center axle of this magnetic pole is in control piece one side with respect to the minimum position in second gap.
According to the present invention, the pole center axle of magnetic pole is in control piece one side with respect to the minimum position in second gap, and the developer conveying capacity that therefore prevents to be sent to second gap increases too much and the excessive developer that produced by control piece can remain on the state that developer mutually combines hardly.
Be characterised in that according to developing apparatus of the present invention and image processing system second clearance G 2 (mm) is defined as G1＜G2≤0.8 * Dm, wherein G1 is first gap (mm), and Dm is the width (mm) of magnetic pole.
According to the present invention,, therefore carry out to be sent to by control piece after preliminary charged the developer in second gap by scraper member on, carry out master tape because second gap is greater than first gap.And, owing to be set at G2≤0.8 * Dm, near the high magnetic flux density state of back flow plate, promptly append to the carrier of two-component developer with square proportional magnetic pull of magnetic flux density.Under the state of big friction force, control bed thickness at the end that transmits the downstream, and can carry out tentatively charged effectively by scraper member.And, preferably, be set to G2≤(2/3) * Dm, with the higher state of magnetic flux density near back flow plate is provided, promptly square proportional magnetic pull with magnetic flux density appends on the carrier.Under the state of end that transmits the downstream, control bed thickness, and can carry out tentatively charged more effectively by scraper member in bigger friction force.
Be characterised in that according to developing apparatus of the present invention and image processing system comprising near control piece and/or scraper member further that developer that the developer that is used to prevent to be sent to the gap gathers is detained suppresses part.
According to the present invention, owing near control piece and/or scraper member, provide developer be detained to suppress part, therefore can reduce the magnetic flux density in the circulating path of the excessive developer that produces by control piece, and the developer that circulates glibly.In addition, can prevent the developer degradation that causes by the unnecessary stress that developer gathers.
Be characterised in that according to developing apparatus of the present invention and image processing system scraper member and back flow plate are integrally formed.
According to the present invention,, therefore can reduce the bending of scraper member that the trail drag force by the scraping developer causes, and keep the amount in second gap towards the gap expansion direction because scraper member and back flow plate strengthen mutually.And, can reduce the bending of back flow plate, thereby keep the circulation ability of developer.
Be characterised in that according to developing apparatus of the present invention and image processing system, be arranged near the developer delay inhibition part of control piece and have the contact back flow plate and prevent that scraper member is developed the lug boss of agent skew.
According to the present invention, because the bending of the scraper member that the lug boss contact back flow plate that developer be detained to suppress part is caused by developer with control, therefore can reduce scraper member that the trail drag force by the scraping developer causes towards the crooked of gap expansion direction and keep the amount in second gap.And, can reduce the bending of back flow plate, thereby keep the circulation ability of developer.
Be characterised in that according to developing apparatus of the present invention and image processing system control piece has similar linear expansion coefficient with scraper member.
According to the present invention,, therefore can reduce the distortion in first gap and second gap owing to the control piece that can reduce to cause and the distortion difference of scraper member by temperature change.Therefore, can keep stable first gap and second gap.
Be characterised in that according to developing apparatus of the present invention and image processing system developer roll, control piece and scraper member are supported by the common support part.
According to the present invention,, therefore can keep the amount in first gap and second gap owing to can keep the exact position between developer roll, control piece and the scraper member to concern.And, thereby developer roll, control piece, scraper member can be integrated into the operability that a combiner has improved assembling.
Be characterised in that according to developing apparatus of the present invention and image processing system, the developer level M2 (g/s/cm) that is sent to second gap is defined as the G2 of M2＞(M1/G1), wherein G1 is first gap (mm), G2 is second gap (mm), and M1 is the developer level (g/s/cm) that transmits from first gap.
According to the present invention, do not control its bed thickness owing to be sent to the developer in second gap, so bed thickness is uneven.Therefore, even be less than or equal to second clearance G 2 (M1/G1) as average conveying capacity M2av, the part of developer is touch controls part and being swiped also, thereby can be by preliminary charged raising internal circulating load.
Be characterised in that according to developing apparatus of the present invention and image processing system, by back flow plate be positioned near the control piece developer and be detained and suppress the third space that part limits and be equal to or greater than 4.2mm.
According to the present invention, developer reduces at third space round-robin resistance, thereby can control reducing of the developer internal circulating load that caused by the circulating path resistance.
Be characterised in that according to developing apparatus of the present invention and image processing system third space is greater than second gap.
According to the present invention, developer reduces at third space round-robin resistance, thereby can control reducing of the developer internal circulating load that caused by the circulating path resistance.
Be characterised in that according to developing apparatus of the present invention and image processing system, further comprise the container of the developer that puts the toner that comprises Magnaglo and have the mean grain size that is less than or equal to 7.5 μ m with the mean grain size that is less than or equal to 65 μ m.
According to the present invention, when the particle diameter that reduces developer when improving picture quality, this is effective especially, because the reasonable toner density of developer uprises, has reduced magnetic pull, and more developer drops under the control piece.
As mentioned above, according to the present invention, before being sent to first gap, developer is swiped by scraper member and is carried out tentatively charged on developer.Therefore, when developer was two-component developer, repulsion can put on the excessive developer and the excessive developer that are produced by control piece and mutually combine hardly.Therefore, carry out the circulation of developer glibly.
And according to the present invention, the pole center axle that magnetic pole is set to it is positioned at control piece one side with respect to the minimum position in second gap.Therefore, the developer conveying capacity that the is sent to second gap excessive developer level that is reduced and produced by control piece itself is reduced.Therefore, excessive developer can remain on the state that developer mutually combines hardly.
According to the present invention, magnetic pole is set to its pole center axle unanimity in the minimum position in second gap.Therefore, the developer conveying capacity that prevents to be sent to second gap increases and the excessive developer that produced by control piece can remain on the state that developer mutually combines hardly too much.
According to the present invention, the pole center axle that magnetic pole is set to it is in control piece one side with respect to the minimum position in second gap.Therefore, the developer conveying capacity that prevents to be sent to second gap increases and the excessive developer that produced by control piece can remain on the state that developer mutually combines hardly too much.
According to the present invention,, therefore obtain high magnetic flux density state, thereby carry out tentatively charged effectively near back flow plate because magnet pole widths is set at G1＜G2≤0.8 * Dm.
According to the present invention, because being detained, the developer that provides the developer that is used to prevent to be sent to the gap to gather suppresses part, therefore can reduce the magnetic flux density in the circulating path of the excessive developer that produces by control piece, and the developer that circulates glibly.In addition, can prevent the developer degradation that causes by the unnecessary stress that developer gathers.
According to the present invention,, therefore can reduce the bending of scraper member that the trail drag force by the scraping developer causes, and keep the amount in second gap towards the gap expansion direction because scraper member and back flow plate strengthen mutually.And, can reduce the bending of back flow plate, thereby keep the circulation ability of developer.
According to the present invention, because the lug boss contact back flow plate that developer be detained to suppress part, therefore can reduce scraper member that the trail drag force by the scraping developer causes with the bending of the scraper member that prevents to be caused by developer towards the crooked of gap expansion direction and keep the amount in second gap.And, can reduce the bending of back flow plate, thereby keep the circulation ability of developer.
According to the present invention,, therefore can reduce the distortion in first gap and second gap owing to the control piece that can reduce to cause and the distortion difference of scraper member by temperature change.Therefore, can keep stable first gap and second gap.
According to the present invention,, therefore can keep the amount in first gap and second gap owing to can keep the exact position between developer roll, control piece and the scraper member to concern.And, thereby developer roll, control piece, scraper member can be integrated into the operability that a combiner has improved assembling.
According to the present invention, even be less than or equal to second clearance G 2 (M1/G1) as average conveying capacity M2av, the part of developer is touch controls part and being swiped also, thereby can be by preliminary charged raising internal circulating load.
According to the present invention, because third space G3 is equal to or greater than 4.2mm, so developer reduces at third space round-robin resistance, and can control reducing of the developer internal circulating load that caused by the circulating path resistance.
According to the present invention, because third space is greater than second gap, so developer reduces at third space round-robin resistance, thereby can control reducing of the developer internal circulating load that caused by the circulating path resistance.
According to the present invention, when the particle diameter that reduces developer when improving picture quality, this is effective especially, because the reasonable toner density of developer uprises, has reduced magnetic pull, and more developer drops under the control piece.
Description of drawings
Fig. 1 is the sectional view of expression according to the structure of developing apparatus of the present invention;
Fig. 2 is the enlarged drawing according to the major part of developing apparatus of the present invention;
Fig. 3 is the decomposition diagram that supports the supporting construction of developer roll and miscellaneous part;
Fig. 4 be expression corresponding on the pole center axle radially distance and from the view of the magnetic flux density scalar of the angle of slip of the minimum position (a) of pole center axle;
Fig. 5 be expression corresponding on the pole center axle radially distance and from the view of the magnetic flux density radial component of the angle of slip of the minimum position (a) of pole center axle;
Fig. 6 be expression corresponding on the pole center axle radially distance and from the view of the magnetic flux density rotation direction component of the angle of slip of the minimum position (a) of pole center axle;
Fig. 7 (a) is expression corresponding to the view from the radial component magnetic flux density of the angle of slip of the minimum position (a) of pole center axle;
Fig. 7 (b) is expression corresponding to the view from the radial component normalization magnetic flux density of the angle of slip of the minimum position (a) of pole center axle;
Fig. 8 (a) is expression corresponding to the view from the rotation direction component magnetic flux density of the angle of slip of the minimum position (a) of pole center axle;
Fig. 8 (b) is expression corresponding to the view from the rotation direction component normalization magnetic flux density of the angle of slip of the minimum position (a) of pole center axle;
Fig. 9 is the distance of expression radial direction and the chart of the relation between the normalization magnetic flux density on the pole center axle;
Figure 10 is that expression pole center axle is with respect to the position of the minimum position (a) in second gap and the chart of the relation between the developer internal circulating load;
Figure 11 is the view of the relation between expression third space and the developer internal circulating load;
Figure 12 is that expression comprises the vertical cross-section front elevation according to the structure of the major part of the image processing system of developing apparatus of the present invention; And
Figure 13 is the sectional view of the structure of the existing developing apparatus of expression.
Embodiment
Following with reference to description of drawings the present invention.
Fig. 1 is the sectional view of expression according to the structure of developing apparatus of the present invention.
Developing apparatus comprises: the container 1 that is used to deposit two-component developer; Be used for developer be sent to band on photosensitive drums 2 electrostatic latent image and with the developer roll 3 of latent electrostatic image developing; Be used to control the control piece 4 of amount that is sent to the developer of electrostatic latent image by developer roll 3; With second clearance G 2 in the face of scraper member 5, the second clearance G 2 of developer roll 3 greater than first clearance G 1 that is formed between developer roll 3 and the control piece 4, these scraper member 5 controls are sent to the developer bed thickness of first clearance G 1 with the scraping developer; Be used for to reflux by the excessive developer of control piece 4 controls and leave the back flow plate 6 of control piece 4; And the agitating roller 7 that is used for the developer in the stirred vessel 1.Here, control piece 4, scraper member 5 and back flow plate 6 are formed on the length corresponding to the length of developer roll 3.
In the face of the set-up mode of the magnetic pole N1 of photosensitive drums 2 is: pole center axle P1 with respect to the straight line of the central shaft O2 of central shaft O1 by photosensitive drums 2 and developer roll 3 towards 3 ° of the upstream side skews of developer direction of transfer.The side-play amount of the pole center axle P1 of magnetic pole N1 is measured by surveying instrument.This surveying instrument has the needle that rotates around the central shaft O1 of photosensitive drums 2, and detects side-play amount according to the rotational angle of needle.
Fig. 2 is the enlarged drawing of major part.In the face of orientating pole center axle P2 as, the magnetic pole N2 of second clearance G 2 is in control piece 4 opposite sides with respect to the minimum position " a " of second clearance G 2, that is to say, orientate as with respect to the more close control piece 4 in position (downstream of developer direction of transfer) that is offset 1.5 ° towards the upstream side of developer direction of transfer.And magnetic pole N2 is set at 4mm along the width dimensions Dm of the circumferencial direction of developer roll 3.
In the process of control piece 4 controls by the conveying capacity of the developer of developer roll 3 transmission, control piece 4 carries out the main electrostatic charging of developer.Control piece 4 is made of the nonmagnetic metal plate with square-section, and the outer peripheral face of developer roll 3 is faced on a surface of the Width of control piece 4 at first clearance G, 1 place.Control piece 4 has approximately identical linear expansion coefficient with scraper member 5.That is to say that control piece 4 and scraper member 5 are made by materials similar, even and when the temperature variation owing to the longitudinal direction two ends causes control piece 4 and scraper member 5 crooked skews, the variation of first clearance G 1 and second clearance G 2 also can be reduced.And control piece 4 is in the opening 1a of container 1 and between magnetic pole S1 and N2.Control piece 4 is fixed in opening 10a by lid 1O, and lid 10 is fixed in control piece 4.Here, control piece 4 and scraper member 5 are by forming such as aluminium or stainless sheet metal.
Be sent in the process of the conveying capacity (bed thickness) of the developer of first clearance G 1 and the developer of swiping by developer roll 3 in scraper member 5 controls, scraper member 5 is carried out the preliminary electrostatic charging of developer.Scraper member 5 and nonmagnetic back flow plate 6 whole formation.Back flow plate 6 be set to one from the top of developer roll 3 slope towards the top of agitating roller 7, make developer roll 3 be higher than agitating roller 7.The end that is positioned at developer roll 3 one sides of back flow plate 6 is folding towards developer roll 3, thereby forms folding part 6a.This folding part 6a is confirmed as scraper member 5.
The width dimensions Dm (mm) of second clearance G 2, first clearance G 1 (mm) and magnetic pole N2 is set at the relation that keeps following.
G1＜G2≤0.8×Dm
Preferably, first clearance G 1 is set at 0.5mm usually, and second clearance G 2 is set at 2.3mm or 3.2mm usually.The width dimensions Dm of magnetic pole N2 is set at 4mm as mentioned above, and still, this width is so long as suitablely just need not limit.
The developer level M2 (g/s/cm) of the developer level M1 (g/s/cm) of first clearance G 1, second clearance G 2, the per unit length that transmits from first clearance G 1 and the per unit length that transmits from second clearance G 2 is set at the relation below keeping.
M2＞(M1/G1)G2
Here, M1 and M2 are the amounts that transmits in 10 seconds by the developer in gap, and the measurement length of longitudinal direction is 5cm between control piece and the scraper member.(M1/G1) be the weight (g) of the per unit length in gap by the developer in gap.
Be provided with first developer near the control piece 4 in container 1 and be detained inhibition part 12, be used to suppress to be sent to the developer of first clearance G 1,, be trapped in the upstream side of control piece 4 promptly by the excessive developer of control piece 4 controls.And, near scraper member 5, being connected with second developer and be detained suppressing part 13, the developer that is used to suppress to be sent to second clearance G 2 is trapped in the upstream side of scraper member 5.
First developer be detained to suppress part 12 and second developer and is detained and suppresses part 13 and be made of the nonmagnetic substance such as metal or synthetic resin that has corresponding to the length of the length of developer roll 3.First developer be detained to suppress between the upper wall that part 12 is arranged on end of control piece 4 Widths and container 1, and developer is detained and suppresses part 12 and vertically be located away from back flow plate 6, thereby excessive developer is directed to back flow plate 6 glibly.In addition, be vertically arranged with the lug boss 12a of the upper surface of a plurality of separate contact back flow plates 6 in the bottom that first developer be detained to suppress part 12.Lug boss 12a prevents being bent upwards of back flow plate 6.Here, in Fig. 1, first developer be detained to suppress part 12 and is set to from control piece 4 to back flow plate 6 upper end, and still, first developer is detained the length from control piece 4 that suppresses part 12 and is not limited to particular value.And first developer is detained inhibition part 12 can form one with control piece 4.
Second developer delay inhibition part 13 is arranged between scraper member 5 and the back flow plate 6 along the lower surface of back flow plate 6, thereby can glibly developer be sent to second clearance G 2.Second developer is detained inhibition part 13 can form one with back flow plate 6.
Fig. 3 is the decomposition diagram that expression is used to support the supporting construction of developer roll and miscellaneous part.Developer roll 3, control piece 4 and the back flow plate 6 (and scraper member 5) that are arranged on as mentioned above in the container 1 are supported by two common support parts 11 and 11.They are to be installed in the container 1 by support member 11 and 11 states that support.Support member 11 and 11 is made of flat board, and comprises diameter through hole 11a and 11a at their respective center branch, and the axial region 3a of developer roll 3 is assemblied among through hole 11a and the 11a at two ends.In addition, support member 11 and 11 ends at them comprise minor diameter through hole 11b, 11b and minor diameter through hole 11c, 11c, minor diameter through hole 11b, 11b face and are arranged on a plurality of threaded hole 12b and the 12b that first developer that is fixed in control piece 4 is detained the both ends of inhibition part 12, and minor diameter through hole 11c, 11c are in the face of being arranged on a plurality of threaded hole 13a and the 13a that second developer that is fixed in scraper member 5 is detained the both ends of inhibition part 13.Then, under control piece 4 and scraper member 5 were arranged on state between support member 11 and 11, the axial region 3a of developer roll 3 was assemblied among through hole 11a, the 11a at two ends, and is screwed in threaded hole 12b and the 13a by through hole 11b and 11c such as the external thread of Screw.Thereby, form a combiner, and this combiner is installed in the container 1.
Two-component developer leaves in the container 1 of the developing apparatus of constructing as mentioned above.Developer is made of carrier and the toner such as Magnaglo.Adopt the developer of particle diameter less than common particle diameter.Common carrier has the mean grain size of 85 μ m, and carrier of the present invention has the mean grain size that is less than or equal to 65 μ m.And common toner has the mean grain size of 8.5 μ m, and toner of the present invention has the mean grain size that is less than or equal to 7.5 μ m.
When being carried on the electrostatic latent image on the photosensitive drums 2 when developing, photosensitive drums 2 clockwise rotates as shown in Figure 1, and the sleeve 32 of developer roll 3 and agitating roller 7 rotate counterclockwise as shown in Figure 1.Developer in the container 1 is sent to conveying capacity (bed thickness) in second clearance G 2 and Be Controlled second clearance G 2 by developer roll 3 under the stirring of agitating roller 7.Then, developer passes through second clearance G 2 under the scraping of scraper member 5.The developer that is sent to second clearance G 2 is detained 13 controls of inhibition part by second developer, and it gathers and is sent to glibly second clearance G 2.After second clearance G 2, developer is sent to first clearance G 1.Second clearance G 2 is set to greater than first clearance G 1, is therefore formed excessive developer and is provided certain developer internal circulating load by scraper member 5 by control piece 4 certainly.It gathers and refluxes towards back flow plate 6 excessive developer by 12 controls of first developer delay inhibition part, and is back to the top of agitating roller 7 by back flow plate 6.Generally, developer is around back flow plate 6 circulations.
Fig. 4 be expression corresponding on the pole center axle radially distance and the pole center axle from the view of the magnetic flux density scalar of the angle of slip of minimum position (a).Fig. 5 be expression corresponding on the pole center axle radially distance and the pole center axle from the view of the magnetic flux density radial component of the angle of slip of minimum position (a).Fig. 6 be expression corresponding on the pole center axle radially distance and the pole center axle from the view of the magnetic flux density rotation direction component of the angle of slip of minimum position (a).It is pointed out that in Fig. 4 to 6 distance radially is the radius size of developer roll 3 and the size sum of second clearance G 2.
Fig. 7 (a) is that expression is corresponding to the view of pole center axle from the radial component magnetic flux density of the angle of slip of minimum position (a).Fig. 7 (b) is that expression is corresponding to the view of pole center axle from the radial component normalization magnetic flux density of the angle of slip of minimum position (a).Positive number on the transverse axis represents to transmit the angle of slip of upstream side from minimum position (a), and the numerical table on the transverse axis shows the angle of slip of transmission downstream from minimum position (a).In Fig. 7, size that can be by changing second clearance G 2 on the pole center axle P2 and pole center axle P2 change the magnetic flux density component from the angle of slip of minimum position (a).And, shown in Fig. 7 (b), when the width D m=4mm of magnetic pole N2, can be illustrated on one section by normalization magnetic flux density component.In Fig. 7, the radius size of developer roll 3 is set at 25mm.Size Expressing developer roll 3 distance radially corresponding to the size sum of second clearance G 2 of the radius size of 25mm and 2.5mm, 3.5mm and 7.0mm is 27.5mm, 28.5mm and 32.0mm.
Fig. 8 (a) is that expression is corresponding to the view of pole center axle from the rotation direction component magnetic flux density of the angle of slip of minimum position (a).Fig. 8 (b) is that expression is corresponding to the view of pole center axle from the rotation direction component normalization magnetic flux density of the angle of slip of minimum position (a).Positive number on the transverse axis represents to transmit the angle of slip of upstream side from minimum position (a), and the numerical table on the transverse axis shows the angle of slip of transmission downstream from minimum position (a).As Fig. 8 (a) thus shown in rotation direction component magnetic flux density can shown in Fig. 8 (b), be illustrated on one section by normalization.
Fig. 9 is the distance of expression radial direction and the chart of the relation between the normalization magnetic flux density on the pole center axle.The width dimensions Dm of magnetic pole N2 is 4mm, and second clearance G 2 is set to G1＜G2≤0.8 * Dm.Because G2≤0.8 * Dm is set at 2.3mm≤3.2mm, therefore the magnetic flux density B near back flow plate 6 becomes big (B 〉=41%).That is to say, append to the carrier (B^2 〉=17%) of developer with square proportional magnetic pull of magnetic flux density, and transmit the downstream under the state of big friction force by scraper member 5 control bed thickness, thereby can carry out tentatively charged effectively.And, preferably, be set to G2≤(2/3) * Dm, promptly 2.3mm≤2.7mm so that the higher state (B 〉=45%) of magnetic flux density B near back flow plate 6 to be provided, promptly appends to the state of carrier (B^2 〉=20%) with square proportional magnetic pull of magnetic flux density.
The developer level M1 of first clearance G 1, second clearance G 2, per unit length and the developer level M2 of per unit length are set at the G2 of M2＞(M1/G1).Therefore, the developer that is sent to second clearance G 2 is not controlled by scraper member 5 and bed thickness is uneven.Therefore, even be less than or equal to second clearance G 2 (M1/G1) as conveying capacity mean value M2av, a part of touch controls part 4 of developer and swiped and can be by preliminary charged raising internal circulating load.Be less than or equal in this value under the situation of controlled quentity controlled variable, the scraping state can be uneven, because it depends on conveying capacity dramatically and developer layer forms state.But, can prevent this inhomogeneous by above-mentioned setting.
Figure 10 is that expression pole center axle is with respect to the position of the minimum position (a) in second gap and the chart of the relation between the developer internal circulating load.
Because the developer internal circulating load is subjected to the influence of the distance in the developer level in the container 1 and second gap, therefore in Figure 10, the developer level container 1 in is that the distance of 1400g or the 1250g and second clearance G 2 is a measurement developer internal circulating load under the state of 4mm, 3.2mm or 2.3mm.Move to from the minimum minimum position (a) of the distance of second clearance G 2 towards the position of transmitting 1.5 ° of upstream side skews up to the pole center axle P2 of magnetic pole N2, be attracted to the pole center axle P2 that side is transmitted in the upstream with respect to minimum position (a) magnetic force, and diminish with the developer conveying capacity of comparing in second clearance G 2 towards the situation that transmits the downstream skew from minimum position (a) that transmits by magnetic force.Therefore, can obtain stable developer internal circulating load as shown in figure 10.
By magnetic pole N2 being arranged so that pole center axle P2 is offset towards transmitting the downstream from minimum position (a), the developer internal circulating load increases as shown in figure 10 gradually.But, when second clearance G 2 is 2.3mm, pole center axle P2 from minimum position (a) under the state that transmits 1.5 ° of downstream skews, scraper member 5 begins to control the developer conveying capacity.Therefore, though when pole center axle P2 from minimum position (a) when transmitting 1.5 ° of downstream skews, the developer internal circulating load also is stable.And, when second clearance G 2 is 4mm, 5 conveying capacities of controlling developer hardly between scraping, thus the developer internal circulating load is to increase in the situation of 3.2mm or 2.3mm unlike second clearance G 2.
The developer internal circulating load is controlled by the circulating path resistance of third space G3 sometimes, and wherein this third space G3 is limited by back flow plate 6 and first developer delay inhibition part 12.
Figure 11 is the view of the relation between expression third space and the developer internal circulating load.Figure 11 expresses the measurement result (g/seccm) of developer internal circulating load when changing the third space G3 that is limited by back flow plate 6 and first developer delay inhibition part 12.Referring to Figure 11, can find, even to be less than or equal to 4.0mm be that the developer internal circulating load significantly reduces as third space G3, but be equal to or greater than 4.2mm and can obtain stable developer internal circulating load by third space G3 is set at.The upper limit of the size of third space G3 is determined according to the largest loop amount of developer.Here can see stable circulating in 4.2 in the scope of 5.2mm, the upper limit should be equal to or greater than 5.2mm.
Similarly, as shown in figure 10, although 5 internal circulating loads of controlling developer hardly between scraping when second clearance G 2 is 4mm, but the internal circulating load of scraper member 5 control developers when second clearance G 2 is 3.2mm or 2.3mm, be detained the scraping that suppresses part 12 and developer by first developer, circulating path resistance among the third space G3 enlarges markedly, when third space G3 become less than 4mm the time developer internal circulating load significantly reduce.
Figure 12 is that expression comprises the vertical cross-section front elevation according to the structure of the major part of the image processing system of developing apparatus of the present invention.
Developing apparatus with said structure for example is installed in the image processing system with electrophotographic process unit.As shown in figure 12, image processing system is a digital copier, comprises scanner 20, is used for the image of scan manuscript; Rotate photosensitive drums 2 (figure formation unit), have electrostatic latent image at its outer peripheral face; Charging system 21 is used for carrying out on photosensitive drums 2 charged; Exposure device, it has laser beam scanner and is used to make the electrostatic latent image of photosensitive drums 2 carryings corresponding to original image; Developing apparatus A is used for developing electrostatic latent image; Transfer device 22 is used for the toner image of having developed on the photosensitive drums 2 is transferred to paper; Cleaning plant is used to remove the developer that remains on the photosensitive drums 2; Electric discharge device is used to remove the electric charge on the photosensitive drums 2; Paper feed unit 23 is used for towards photosensitive drums 2 feeding paper; And paper post-processing unit 24, be used for the paper that has formed image on it is carried out aftertreatment.
According to the foregoing description, scraper member and back flow plate are configured to the plate shape of one, provide but scraper member can be independent of back flow plate.
Claims (15)
1. developing apparatus comprises: developer roll, and it has magnetic roller, is used to transmit developer and developing electrostatic latent image; Control piece is used to control the amount that is sent to the developer of electrostatic latent image by developer roll; And back flow plate, being used for and will leaving control piece by the excessive developer backflow of control piece control, this developing apparatus comprises:
Scraper member, its be set to greater than second clearance plane in first gap that limits by developer roll and control piece to developer roll, and scraping is sent to the developer in first gap.
2. developing apparatus as claimed in claim 1, wherein magnetic roller has a plurality of magnetic poles that are provided with along its circumferencial direction, and one of magnetic pole is set in the face of the position in second gap, and the pole center axle of this magnetic pole is in control piece one side with respect to the position of 1.5 ° of the opposite side skews from the minimum position in second gap towards control piece.
3. developing apparatus as claimed in claim 1, wherein magnetic roller has a plurality of magnetic poles that are provided with along its circumferencial direction, and one of magnetic pole is set in the position in the face of second gap, and the pole center axle unanimity of this magnetic pole is in the minimum position in second gap.
4. developing apparatus as claimed in claim 1, wherein magnetic roller has a plurality of magnetic poles that are provided with along its circumferencial direction, and one of magnetic pole is set in the position in the face of second gap, and the pole center axle of this magnetic pole is in control piece one side with respect to the minimum position in second gap.
5. developing apparatus according to any one of claims 1 to 4, wherein second clearance G 2 (mm) is defined as G1＜G2≤0.8 * Dm, and wherein G1 is first gap (mm), and Dm is the width (mm) of magnetic pole.
6. as each described developing apparatus in the claim 1 to 5, further comprise:
Near being used to control piece and/or scraper member prevents to be sent to developer that the developer in gap gathers and is detained and suppresses part.
7. as each described developing apparatus in the claim 1 to 6, wherein scraper member and back flow plate are integrally formed.
8. developing apparatus as claimed in claim 7 wherein is arranged near the developer delay inhibition part of control piece and has the contact back flow plate and prevent that scraper member is developed the lug boss of agent skew.
9. as each described developing apparatus in the claim 1 to 8, wherein control piece has similar linear expansion coefficient with scraper member.
10. as each described developing apparatus in the claim 1 to 9, wherein developer roll, control piece and scraper member are supported by the common support part.
11. as each described developing apparatus in the claim 1 to 10, the developer level M2 (g/s/cm) that wherein is sent to second gap is defined as the G2 of M2＞(M1/G1), wherein G1 is first gap (mm), G2 is second gap (mm), and M1 is the developer level (g/s/cm) that transmits from first gap.
12. as each described developing apparatus in the claim 6 to 11, wherein by back flow plate be positioned near the control piece developer and be detained and suppress the third space that part limits and be equal to or greater than 4.2mm.
13. developing apparatus as claimed in claim 12, wherein third space is greater than second gap.
14., further comprise the container of the developer that puts the toner that comprises Magnaglo and have the mean grain size that is less than or equal to 7.5 μ m with the mean grain size that is less than or equal to 65 μ m as each described developing apparatus in the claim 1 to 11.
15. an image processing system comprises as each described developing apparatus in the claim 1 to 14, is used for developing electrostatic latent image; And
Image formation unit is used for forming the image that develops on paper.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003317562 | 2003-09-09 | ||
| JP317562/2003 | 2003-09-09 | ||
| JP038375/2004 | 2004-02-16 |
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| Publication Number | Publication Date |
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| CN1849565A true CN1849565A (en) | 2006-10-18 |
| CN100449416C CN100449416C (en) | 2009-01-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2004800259487A Expired - Fee Related CN100449416C (en) | 2003-09-09 | 2004-09-07 | Developing device and image forming device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101339391B (en) * | 2007-07-03 | 2011-02-02 | 夏普株式会社 | Developing device and image forming apparatus |
| CN101546162B (en) * | 2008-03-28 | 2012-01-11 | 株式会社理光 | Developing unit, process cartridge including same, and image forming apparatus incorporating same |
| CN114008543A (en) * | 2019-06-18 | 2022-02-01 | 惠普发展公司， 有限责任合伙企业 | Imaging system with non-magnetic actuator and auxiliary actuator |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10274878A (en) * | 1997-03-31 | 1998-10-13 | Toshiba Corp | Developing device |
| JP3731981B2 (en) * | 1997-08-26 | 2006-01-05 | シャープ株式会社 | Developing device for image forming apparatus |
| JP4070387B2 (en) * | 1999-06-21 | 2008-04-02 | 株式会社リコー | Developing device and image forming apparatus |
| JP4139551B2 (en) * | 2000-06-27 | 2008-08-27 | セイコーエプソン株式会社 | Development device |
| JP2003005513A (en) * | 2001-06-21 | 2003-01-08 | Ricoh Co Ltd | Developing device, process cartridge and image forming device |
| JP3544652B2 (en) * | 2001-09-06 | 2004-07-21 | シャープ株式会社 | Developing device for image forming apparatus |
| JP2003215917A (en) * | 2002-01-24 | 2003-07-30 | Canon Inc | Developing device, process cartridge and image forming apparatus |
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2004
- 2004-09-07 CN CNB2004800259487A patent/CN100449416C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101339391B (en) * | 2007-07-03 | 2011-02-02 | 夏普株式会社 | Developing device and image forming apparatus |
| CN101546162B (en) * | 2008-03-28 | 2012-01-11 | 株式会社理光 | Developing unit, process cartridge including same, and image forming apparatus incorporating same |
| CN114008543A (en) * | 2019-06-18 | 2022-02-01 | 惠普发展公司， 有限责任合伙企业 | Imaging system with non-magnetic actuator and auxiliary actuator |
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| Publication number | Publication date |
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| CN100449416C (en) | 2009-01-07 |
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