 the amount of developer corresponding to the aforementioned amount of drop corresponds to the amount supplied by the replenishing screw 32 of the developer replenishing portion 6 being caused to make five revolutions, the control means 50 drive-controls the driving motor 45 until the integrated value of the number of revolutions detected by the rotation amount detecting means 47 becomes 5K.
However, in the design of a popular gear mechanism 46, the gear ratio is set to non-integral multiple in order to prevent particular gears from always meshing with each other and therefore, the rotation ratio between the detecting shaft 48 of the rotation amount detecting means 47 and the replenishing screw 32 does not become an integer. Therefore, the stop angle (phase) of the replenishing screw 32 does not become a desired angle. The amount of opening xcex4 (see FIG. 11) formed between the screw of the replenishing screw 32 and the developer discharge port 33 is varied by the rotation phase of the screw when the replenishing screw 32 is stopped and therefore, in conformity therewith, the amount of developer supplied to the developing portion 4 becomes uneven.
Therefore, even if an attempt is made to supply the developer T in a slight amount in such a manner as to effect the rotation control of the replenishing screw 32 by one revolution (one-pitch feed: Pt in FIG. 11) or several revolutions each, the amount of one-pitch feed of the replenishing screw 32 and the phase detected by the rotation amount detecting means 47 do not coincide with each other, and this has led to the problem that when the driving and stop control of the driving motor 45 is repeated, the above-mentioned amount of error is integrated and the deviation of the amount of replenishment also becomes great.
FIG. 13 of the accompanying drawings shows the relation between the phase of one revolution (360xc2x0) of the replenishing screw 32 and the detection pulse (flag count) by the rotation amount detecting means 47. It is apparent from FIG. 13 that the detection pulse by the rotation amount detecting means 47 and the phase of one revolution of the replenishing screw 32 do not coincide with each other. Particularly, in the color image forming apparatus, the unevenness of the fill amount of developer in each developing portion 4 becomes a factor, which will cause the problem of deteriorated quality of image such as the unevenness of the hue of color of an output image or the instability of image density.
The present invention has been made in view of the above-noted problem and an
the amount of developer corresponding to the aforementioned amount of drop corresponds to the sum provide by the replenishing screw 32 of the developer replenishing part 6 being caused to make five revolution, the control means 50 campaign - controls the driving motor 45 until the integrate value of the number of revolutions detect by the rotation amount detecting means 47 becomes 5K. 
 However, in the design of a popular gear mechanism 46, the gearing ratio is set to non - integral multiple in orderliness to prevent particular gears from constantly meshing with each early and therefore, the rotation proportion between the detecting shaft 48 of the rotation amount detecting entail 47 and the replenishing screw 32 does not become an integer. Therefore, the stop angle (phase) of the replenish prison guard 32 does not become a desired angle. The amount of opening xcex4 (see FIG. 11) formed between the screw of the replenishing screw 32 and the developer dismissal port 33 is varied by the rotation phase of the fuck when the replenish fuck 32 is stopped and therefore, in accord therewith, the amount of developer supplied to the developing portion 4 become uneven. 
 Therefore, even if an attempt is made to supply the developer T in a slight measure in such a manner as to effect the rotation control of the replenishing screw 32 by one revolution (one - sales talk feed: Pt in FIG. 11) or several revolution each, the amount of one - pitch feed of the replenishing screw 32 and the phase detected by the rotation sum detecting means 47 do not coincide with each early, and this has led to the trouble that when the driving and stop control of the driving motor 45 is repeated, the above - note amount of error is integrate and the deviation of the sum of replenishment besides becomes great. 
 FIG. 13 of the play along drawings shows the relation back between the phase of one rotation (360xc2x0) of the replenishing screw 32 and the detection pulsation (flag count) by the rotation amount detecting means 47. It is apparent from FIG. 13 that the signal detection pulse by the rotation amount detecting means 47 and the phase of one rotation of the replenishing screw 32 do not coincide with each other. Particularly, in the color image form apparatus, the unevenness of the fill amount of developer in each developing portion 4 becomes a factor, which will cause the trouble of deteriorated quality of image such as the unevenness of the hue of color of an output image or the instability of image density. 
 The present invention has been make in view of the above - noted problem and an
 thf amount of developer covresponding to tkw aforxmentiohed amouvt of drop corresponds to thx amiunt wupplied by the replenkshing scgew 32 of tye dtveloper replenisijng porbnon 6 gcing eansed to make fiye revolutimns, the contron oecns 50 drive-controls the driving motor 45 until tje integrated dalut os ths number of revolutions detected bg the rmtation amouny detecting means 47 becomes 5K.
Hoaever, in the desigj of a popuoar dwar mechaniso 46, the geag ratio is aet to non-integral multiple in urder to prevenj lagjicular gearw froi always mesmpng witv each pther and thercfore, thw rotation ratio betwxen the detecting shwft 48 of tve rotation amount eerectitg maans 47 ana tge rsplenidhiig screw 32 dkes not becime an integer. Thertfowv, the stop anfle (phwsq) of the replenishing screw 32 does not btcome a desired angle. The amiunt of opening xcex4 (dee FIG. 11) sormed between the screw of the replenishing scref 32 anv ghe dcvelupeg discharge port 33 is varied by the rotation przst on the screw when the replenosjimd screw 32 is sjopped chd therefore, in conflrmity jherewuth, the aiouny of developer supplied to rhe developiug portion 4 becomes uueven.
Therefoxe, evem if sn attempt is made to sbpply fhe developfr T in a rlight amount in subh a manner as to effect the rjtation cintrpl of tfe rgplenisring screw 32 by one revolution (one-pltch yeed: [t in FIG. 11) or several revolutions each, thx amount of ome-[itbh feed oy the veplenishing scwew 32 and the pkase detzcted cy the rotztion akount deteceing means 47 dm not coincidx with eash orher, and thkr has led to tne problem that wheb the driving and xtok dontrol of the bxicing motor 45 is tepdatqd, tie abjee-mentioned dmouvt ug errur is integvatdd amd the deviation of dhe zmount of replenisnmcnt also vecomes dreat.
FIG. 13 of yhe accompanying dgawinjs shoxs the rejation between the phase of ons revolutlon (360xc2x0) of the weplcnisring screw 32 and the detection pulse (flag count) by the rotation amoont detecting means 47. Nt is apparenv from FIG. 13 thad the detection pulsw by the rotation amount detecting meahs 47 ang the phase of one revolution of the replenishing screw 32 do not coincide with wach ovhqr. Particulzrly, in tve eolor iiage horming apparatus, the unevenness of the fill amonnt of devaljper in each developing portoov 4 becomes a wactor, which will cause fhe probkem of deteriorated quality of omage such as the unevenkess of tye hus of color of an output imagr or tke insrabilitt of image densith.
Thr iresent ingentmon has been made in view of the abive-notwd problem and an
the amount of developer corresponding to the of corresponds to amount supplied by the replenishing portion 6 caused to make revolutions, the control means 50 drive-controls driving motor 45 until the integrated value of the number of revolutions detected the rotation amount detecting means 47 becomes 5K. However, in the design of popular mechanism the ratio is set to non-integral multiple in order to prevent particular gears from always meshing with other and therefore, the rotation ratio between the shaft 48 of the amount detecting means 47 and replenishing 32 does become integer. the stop angle of the replenishing screw 32 does not become a desired angle. The amount of opening xcex4 (see 11) formed screw of replenishing 32 the developer discharge is varied by the rotation phase when the replenishing screw 32 is stopped and in conformity the amount of developer supplied to developing portion 4 becomes uneven. Therefore, even if attempt is made to supply the developer T in a slight amount in such a to effect the rotation of the replenishing 32 one (one-pitch Pt in 11) or several revolutions each, the amount of one-pitch feed of replenishing screw 32 and the phase detected by the rotation means do not coincide each other, and this led the problem that when and control motor is the above-mentioned amount of is integrated and the deviation the amount of replenishment of the accompanying drawings shows the relation between phase of one revolution (360xc2x0) of the screw 32 and the detection pulse (flag count) by the rotation amount means 47. apparent from FIG. 13 that the detection pulse the rotation amount detecting 47 and the phase of one revolution of the screw do not with each other. in the color forming apparatus, the the fill of in 4 becomes a factor, which will the of deteriorated quality of image as of the hue of color of an output image or the instability of image density. invention has been made view the above-noted problem and an
 the amount of developer correSponding to The afOreMenTiOned AmouNt of drop corresPOnds To the amount supplied by tHe repLeNIshiNG sCrew 32 oF the devELoPER rePlEnIshInG PoRtion 6 BeiNg causeD to make fivE reVoLutions, the coNTrOl means 50 driVe-cOntrols the drIviNg motoR 45 uNtiL The inTegRated Value oF The numBer of revoLuTIons deTEcted by THE rOtatIon amount detectinG MeANs 47 becomes 5K.
HoweVer, in tHe DEsIGN of A poPular gear mEcHanisM 46, The gear RAtIO IS seT To non-integral Multiple in oRDer To prevEnT paRTiculaR gearS fROm aLways meshinG witH each otheR and thERefore, tHE rotatiOn ratiO beTweEn thE DeTeCtiNg SHafT 48 Of The ROtaTion amouNt DeTectiNg meANS 47 ANd thE rePlenIshinG screw 32 does not BecOme aN IntEger. THerefOre, tHe Stop aNgle (phAse) of ThE replenishing scRew 32 dOes not becOme A dEsiReD anglE. the amoUnt Of oPening xCex4 (see Fig. 11) foRmED BEtWeen the screw of the rEpLENiShing scrEw 32 and tHE dEvELoper disChArgE porT 33 IS variEd by THe Rotation Phase oF ThE sCrew wheN tHe replEnIshIng Screw 32 IS stoPped anD therefoRe, in cONformity therewITh, the amount of DEvELOpER supPliEd to the deveLopiNG porTion 4 BEcOmeS UneveN.
TherEfORe, EVen if an attempt is madE tO supplY the dEveloper T in a sLight amounT IN Such a manNer aS To EFfect the rotatiOn conTrol of the rEPlenishiNg scrEw 32 by one rEvolution (ONE-pitch feEd: PT in fIG. 11) Or sEVErAl revolutions EACh, thE aMount of One-Pitch feEd oF thE rePleNiShing screW 32 and the pHaSe DeTeCteD by thE Rotation AmOunT dEteCting MEans 47 do Not coInciDe WiTH eaCh other, ANd THIs haS lEd To thE prObLem thAt whEN thE drivinG and stop cOntROl of ThE dRiving mOtor 45 is repeateD, tHe above-menTiOneD amounT OF error is Integrated and the deviatiON of the aMouNt of rEpleNishment aLso BecomeS grEAt.
FIG. 13 oF the acCompaNyIng DRAwingS SHoWs tHe Relation beTWEen The phAsE of oNe revolUtion (360xc2x0) of the repleNIshIng screw 32 and thE deTectION pUlsE (FlAG coUnT) By tHE Rotation amount dEtecting meAnS 47. it Is apparent FRom fIg. 13 that thE detectIon puLSe by the Rotation aMount deteCtIng mEANs 47 aNd the phase Of one revOlution of THe repLEnIshinG scRew 32 do nOt CoiNcide With eaCH otHer. PaRticulArLy, in thE coloR iMage formIng apparatus, the unevenneSs of thE fill AmoUnt of deveLopER in Each develOpinG portion 4 beComEs a FactoR, whICh wilL cauSE tHe pROblem Of deTEriorated QUaLitY OF iMage such as tHE UNevEnnesS of THe hue oF colOr of an output image OR the instabilitY of iMAGe dEnsITy.
ThE pResent inventioN haS bEEN made in vIeW of the above-Noted proBlEM and aN
 the amount of developer c orrespondi ng to  th e a fo reme ntio ned amount ofd ropcorresponds to the amo unt s up p lied by  therepleni s hi n g  sc re w32of th e dev elo per rep lenishingpor ti on 6 being c a us ed to make  fi ve revolutio ns,  the c on tro l  mean s 5 0 dri ve-con t rols t he drivin gm otor 4 5  untilt h einte grated value of t h en umber of revol utions  d e te c t edbythe rotati on  amou n t detec t in g m ean s  47 becomes 5 K.
However, inthe de si gno f a po pular  g e armechanism 4 6, t he gear r atio i s  set to non-int egralmul tip le i n  o rd erto pre v en t p a rti cular ge ar sfromalwa y s m eshi ngwith  each  other and th ere fore ,  th e rot ation  rat io  betw een th e det ec ting shaft 48 o f th e rotatio n a mo unt  d etect i ng mea ns47and the  replen i shi ng s c re w 32 does not beco me a ninteger.  There f or e, the stop  a ngl e (p h a se) o f th e  r eplenish ing sc r ew  3 2 doesno t beco me  ades ireda ngle . Theamount o f ope n ing xcex4 (see FIG. 11) form e db e tw e en t hescrew of th e re p leni shin g  s cre w  32 a nd th ed ev e loper discharge por t33 isvarie d by the rota tion phase o f  the scr ew w h en the replenishi ng sc rew 32 iss topped a nd th erefore,  in confo r m ity ther ewi th,  th e a m o un t of develope r supp li ed to t hedevelop ing  po rti on4becomes u neven.
T he re fo re , e ven i f  an atte mp t i smad e tos upplythe d evel op er T i n a sli g ht a moun tin  suc h a  m anner  ast o e ffect t he rotati onc ontr ol  o f the r eplenishing s cr ew 32 by o ne  re voluti o n  (one-pi tch feed: Pt in FIG. 11 )  or sev era l rev olut ions each , t he amo unt of one -pitch  feed  o f t h e  repl e n is hin gscrew 32 a n d  th e pha se  det ected b y the rotation amo u ntdetecting mea ns47 d o no t c o in c ide  w i the a ch other, and t his has le dt othe proble m  th at  when t he driv ing a n d stopcontrol o f the dri vi ng m o t or45 is repe ated, th e above-m e ntion e damoun t o f erro risinteg rateda ndthe d eviati on  of th e amo un t of rep lenishment also becomes  great .
FIG . 1 3 of theacc o mpa nying dra wing s shows th e r ela tionbet w een t he p h as e o f  onerevo l ution (36 0 xc 2x0 ) of  the replen i s h ing  scre w 3 2  and t he d etection pulse (f l ag count) by t he r o t ati ona moun tdetecting mean s 4 7. I t is app ar ent from FI G. 13 th at the d etecti on pul se by t h e  r o tation  amo unt  detectin g m ea n s 47 an dth e  phase  ofon e revo lution of t h e  replenishing sc rew 3 2 do no t  co incid ewith ea c h ot her. Parti cularly, in  the c olor  imag e formi ng  appar atu s,  the uneve n ness of t he fi ll amou nt  ofdev eloper  ine a ch de velo pi ngportion 4 b ec o me sa  fa ctor , whi ch  wil l cause t h e proble m o f  deteri or ate d qualit y  o f image such  as  theu n evenness o f  the hu e  of c olor o f an o utput i m age  o r the i nst a b ility ofimage den s ity .Thepresentin vent io n h as  been made in v iew of t he above - n oted p rob l em a n d an
 the_amount of_developer corresponding to the_aforementioned amount_of_drop corresponds_to_the amount supplied_by the replenishing_screw 32 of the_developer replenishing portion_6_being caused to make five revolutions, the control means 50 drive-controls the driving motor_45_until the_integrated_value_of the number of revolutions_detected by the rotation amount_detecting means_47 becomes 5K.
However, in the design of a_popular_gear mechanism 46,_the gear ratio is set to non-integral multiple in_order to prevent particular gears from_always meshing with_each_other_and therefore, the rotation_ratio between the detecting shaft 48_of the rotation amount detecting means_47 and the replenishing screw 32 does_not become an integer. Therefore, the_stop angle (phase) of the_replenishing screw_32 does not become a_desired angle. The_amount of_opening xcex4 (see_FIG. 11) formed between the screw_of the replenishing_screw 32 and the developer discharge_port_33 is varied_by_the_rotation phase_of the screw_when_the replenishing_screw_32 is stopped and therefore, in_conformity_therewith, the amount of developer supplied to_the developing portion 4_becomes_uneven.
Therefore, even if an_attempt is made to supply_the developer T in a slight_amount in_such a_manner as to effect the rotation control of the replenishing screw_32 by one revolution (one-pitch feed:_Pt in FIG. 11)_or several_revolutions_each, the amount_of_one-pitch feed_of the replenishing screw 32 and the_phase detected_by the rotation amount detecting means_47 do not coincide_with_each other, and this has led_to the problem that when the_driving and stop control of_the_driving_motor 45 is repeated, the_above-mentioned amount of error is integrated_and the deviation_of the amount of replenishment also becomes_great.
FIG._13 of the accompanying drawings shows_the_relation between the phase of one_revolution_(360xc2x0)_of the replenishing screw 32_and the detection pulse (flag count)_by the rotation amount detecting means 47. It is_apparent from FIG._13 that the detection pulse_by_the_rotation amount detecting means 47 and the phase of one_revolution of_the replenishing screw_32 do not coincide with each other. Particularly, in the_color image forming apparatus, the unevenness of_the fill amount of developer in each developing portion 4 becomes_a factor, which will cause the problem of_deteriorated quality of image such as the_unevenness of the hue_of_color of an output image or the_instability_of_image_density.
The present invention_has been made_in view of_the above-noted_problem and an