IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0980720
(2001-11-15)
|
국제출원번호 |
PCT/US00/14011
(2000-05-19)
|
국제공개번호 |
WO00/71381
(2000-11-30)
|
발명자
/ 주소 |
- Bindloss, Jr., William
- Suna, Andris
- Forrest, Jr., Albert White
|
출원인 / 주소 |
- E. I. du Pont de Nemours and Company
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
6 인용 특허 :
7 |
초록
▼
A carriage transporting apparatus is capable of transporting one or more carriages along a track, substantially free of mechanical friction or magnetic drag, by magnetically supporting the carriages in a first direction and by stabilizing the position of the carriages in a second direction by passiv
A carriage transporting apparatus is capable of transporting one or more carriages along a track, substantially free of mechanical friction or magnetic drag, by magnetically supporting the carriages in a first direction and by stabilizing the position of the carriages in a second direction by passive means.
대표청구항
▼
A carriage transporting apparatus is capable of transporting one or more carriages along a track, substantially free of mechanical friction or magnetic drag, by magnetically supporting the carriages in a first direction and by stabilizing the position of the carriages in a second direction by passiv
A carriage transporting apparatus is capable of transporting one or more carriages along a track, substantially free of mechanical friction or magnetic drag, by magnetically supporting the carriages in a first direction and by stabilizing the position of the carriages in a second direction by passive means. method as defined in claim 4, wherein said computational expression deriving step includes: a critical density measuring step for measuring a critical density DM at which a shortage of dampening water causes a defective print, from prints obtained by performing printing a plurality of times while varying the feed rate of dampening water; a preparatory density measuring step for measuring the density D1x of said first detecting patches and the density D2x of said second detecting patches from each of prints obtained by performing printing a plurality of times while varying the feed rate of ink; and a multiple linear regression step for deriving coefficients a, b and c from the following equation (1) representing the parameter Dwx, by multiple linear regression, using the critical density DM measured in said critical density measuring step, and the density D1x of said first detecting patches and the density D2x of said second detecting patches measured in said preparatory density measuring step in time of each printing: Dwx=DM-D1x=a·D1x+b·D2x+c (1). 6. A method as defined in claim 3, wherein said parameter Dwx is regarded as the ink density variation occurring when dampening water is adjusted in said ink density converting step, said second computing step being executed to compute the adjusted feed rate of ink by using a target density DT and said parameter Dwx. 7. A method of feeding dampening water in a printing machine for controlling a feed rate of dampening water along with a feed rate of ink by using two types of detecting patches printed adjacent each other in areas and arranged in a direction of width of printed matter and presenting a difference in density variations after printing with varied feed rates of damping water and ink; wherein one of said two types of detecting patches has a large halftone area ratio and comprises first detecting patches, while the other of said two types of detecting patches has a small halftone area ratio and comprises second detecting patches; said method comprising: a critical density measuring step for measuring a critical density DM at which a shortage of dampening water causes a defective print, from prints obtained by performing printing a plurality of times while varying the feed rate of dampening water; a preparatory density measuring step for measuring a density D1x of said first detecting patches and a density D2x of said second detecting patches from each of prints obtained by performing printing a plurality of times while varying the feed rate of ink; a multiple linear regression step for deriving coefficients a, b and c from an equation (1) set out below and representing a parameter Dwx, by multiple linear regression, using the critical density DM measured in said critical density measuring step, and the density D1x of said first detecting patches and the density D2x of said second detecting patches measured in said preparatory density measuring step in time of each printing; a density measuring step for measuring a density D1x of each of said first detecting patches and a density D2x of each of said second detecting patches arranged in said areas, from printed matter obtained by trial printing; a parameter computing step for computing the parameter Dwx for each of said areas, by using the equation (1) set out below, from the coefficients a, b and c obtained in said multiple linear regression step, and the density D1x of each of said first detecting patches and the density D2x of each of said second detecting patches obtained in said density measuring step; a dampening water feed rate adjusting step for adjusting the feed rate of dampening water based on a minimum parameter minDwx of parameters Dwx for said areas obtained in said parameter computing step; an adjusted ink feed rate computing step for computing an adjusted ink feed rate a for each of said areas, by using an equation (2) set out below and representing the adjusted ink feed rate α, from a tar get density DT, the critical density DM obtained in said critical density measuring step, the parameter Dwx for each of said areas obtained in said parameter computing step, and the minimum parameter minDwx of parameters Dwx for said areas obtained in said parameter computing step; and an ink feed rate adjusting step for adjusting the feed rate of ink for each of said areas based on the adjusted ink feed rate α obtained in said adjusted ink feed rate computing step: Dwx=DM-D1x=a·D1x+b·D2x+c (1) α=DT-DM+(Dwx-minDwx) (2). 8. A method of feeding dampening water in a printing machine for controlling a feed rate of dampening water along with a feed rate of ink by using three types of detecting patches printed adjacent one another in areas, arranged in a direction of width of printed matter and presenting differences in density variations after printing with varied feed rates of damping water and ink; wherein one of said three types of detecting patches has a large halftone area ratio and comprises first detecting patches, another of said three types of detecting patches has a smaller halftone area ratio than said first detecting patches and comprises second detecting patches, and the remaining type of detecting patches has a smaller halftone area ratio than said first detecting patches and a different resolution to said second detecting patches and comprise third detecting patches; said method comprising: a critical density measuring step for measuring a critical density DM at which a shortage of dampening water causes a defective print, from prints obtained by performing printing a plurality of times while varying the feed rate of dampening water; a preparatory density measuring step for measuring a density D1x of said first detecting patches, a density D2x of said second detecting patches a density D3x of said third detecting patches from each of prints obtained by performing printing a plurality of times while varying the feed rate of ink; a multiple linear regression step for deriving coefficients d, e, f and g from an equation (3) set out below and representing a parameter Dwx, by multiple linear regression, using the critical density DM measured in said critical density measuring step, and the density D1x of said first detecting patches, the density D2x of said second detecting patches and the density D3x of said third detecting patches measured in said preparatory density measuring step in time of each printing; a density measuring step for measuring a density D1x of each of said first detecting patches, a density D2x of each of said second detecting patches and a density D3x of each of said third detecting patches arranged in said areas, from printed matter obtained by trial printing; a parameter computing step for computing the parameter Dwx, by using the equation (3) set out below, from the coefficients d, e, f and g obtained in said multiple linear regression step, and the density D1x of each of said first detecting patches, the density D2x of each of said second detecting patches and the density D3x of each of said third detecting patches obtained in said density measuring step; a dampening water feed rate adjusting step for adjusting the feed rate of dampening water based on the parameters Dwx obtained in said parameter computing step; and an ink feed rate adjusting step for adjusting the feed rate of ink based on a target density DT, and the parameter Dwx obtained in said parameter computing step: Dwx=DM-D1x=d·D1x+e·D2x+f·D3x+g (3). 9. A method of feeding dampening water in a printing machine for controlling a feed rate of dampening water by using two types of detecting patches printed adjacent each other on printed matter and presenting a difference in density variations after printing with varied feed rates of damping water; wherein said two types of detecting patches comprise first detecting patches having a halftone area ratio at substantially 100%, and second detecting patches havi ng a halftone area ratio at K×100% K being a coefficient larger than 0 and smaller than 1; said method comprising: a density measuring step for measuring a density Ds of said first detecting patches and a density Dm from said printed matter; a coefficient computing step for computing a coefficient N, by using Yule-Nielsen's equation (4) set out below, from results of measurement obtained in said density measuring step; and a dampening water feed rate adjusting step for adjusting the feed rate of dampening water based on said coefficient N: Dm=-N·Log{1-K(1-10(-Ds/N))} (4). 10. A method as defined in claim 9, further comprising a parameter computing step for computing a parameter Dwn from said coefficient N, said dampening water feed rate adjusting step being executed to adjust the feed rate of dampening water based on said parameter Dwn. 11. A method as defined in claim 10, wherein said parameter Dwn is computed from said coefficient N and one of said density Ds and said density Dm. 12. A method as defined in claim 10, wherein said parameter Dwn is derived from the following equation (5): Dwn=1/(1-10(-Ds/N)) (5). 13. A method as defined in claim 10, wherein said two types of detecting patches are arranged at least in three areas in a direction of printing width; and further comprising a third computing step for computing a water quantity estimate Dwv based on parameters Dws and Dwl for said end areas and a parameter Dwc for said middle area determined by using the computation for the parameter Dwn in said second computing step; said dampening water feed rate adjusting step being executed to adjust the feed rate of dampening water based on said water quantity estimate Dwv. 14. A method as defined in claim 13, wherein said water quantity estimate Dwv is computed from the following equation (7): Dwv=A×{Dwc-(Dws+Dwl)/2}+B×Dwc+C (7) where A, B and C are predetermined coefficients. 15. A method as defined in claim 13, wherein said parameters Dws and Dwl for said end areas are used in adjusting nip pressures of dampening water rollers arranged in the direction of printing width. 16. A method as defined in claim 9, wherein said equation (4) is solved by using the following equation (6) for approximate calculation: Dm=-N·Log{1-K(1-10-Ds)} (6). nting the parameter Dwx, by multiple linear regression, using the critical density DM measured in said critical density measuring step, and the density D1x of said first detecting patches and the density D2x of said second detecting patches measured in said preparatory density measuring step in time of each printing: Dwx=DM-D1x=a·D1x+b·D2x+c (1). 6. A method as defined in claim 3, wherein said parameter Dwx is regarded as the ink density variation occurring when dampening water is adjusted in said ink density converting step, said second computing step being executed to compute the adjusted feed rate of ink by using a target density DT and said parameter Dwx. 7. A method of feeding dampening water in a printing machine for controlling a feed rate of dampening water along with a feed rate of ink by using two types of detecting patches printed adjacent each other in areas and arranged in a direction of width of printed matter and presenting a difference in density variations after printing with varied feed rates of damping water and ink; wherein one of said two types of detecting patches has a large halftone area ratio and comprises first detecting patches, while the other of said two types of detecting patches has a small halftone area ratio and comprises second detecting patches; said method comprising: a critical density measuring step for measuring a critical density DM at which a shortage of dampening water causes a defective print, from prints obtained by performing printing a plurality of times while varying the feed rate of dampening water; a preparatory density measuring step for measuring a density D1x of said first detecting patches and a density D2x of said second detecting patches from each of prints obtained by performing printing a plurality of times while varying the feed rate of ink; a multiple linear regression step for deriving coefficients a, b and c from an equation (1) set out below and representing a parameter Dwx, by multiple linear regression, using the critical density DM measured in said critical density measuring step, and the density D1x of said first detecting patches and the density D2x of said second detecting patches measured in said preparatory density measuring step in time of each printing; a density measuring step for measuring a density D1x of each of sa
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