Patent US4615612A successfully refreshed from Google Patents.
US4615612A
Expired / Lapsed
US
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Color image forming apparatus
Assignee: Canon Inc
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Filing: 1985-05-31
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Granted: 1986-10-07
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Expires: 2005-05-31
Abstract
Abstract A color image forming apparatus wherein a plurality of developing devices or units are supported on a supporting member or turret which is rotatable to revolve the developing devices to move a desired developing device to a developing station where the developing operation is effected with the desired one of the developing devices so that a color image is formed. The position of the developing device is detected, and the detected position is compared with a datum of a target movement scheme predetermined for the developing apparatus. A driving motor for the apparatus is controlled to correct the difference therebetween which is the result of the comparison.
Inventors
- 👤 Akio Ohno
- 👤 Yasushi Murayama
- 👤 Kazuhiko Hirooka
- 👤 Kimiyoshi Hayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:22
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/0896; G03G15/01; G03G15/0105; G03G15/0126; G03G2215/00; G03G2215/01; G03G2215/0167; G03G2215/0174; G03G2215/0177
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
134 words
A color image forming apparatus wherein a plurality of developing units each containing a selected color of developer are supported on a supporting member, and a desired one of the plurality of the developing units is revolved to a predetermined developing station to develop a latent image corresponding to the desired one to provide a color image, said apparatus comprising: driving means for revolving the developing unit; detecting means for detecting at least one of a speed of revolution of the developing unit and a position of the developing unit; and control means for controlling an output of said driving means, said control means comparing a datum provided by said detecting means with a datum of a predetermined target movement scheme and controlling the output of said driving means to correct the difference therebetween.
Claim 2
Dependent Claim
134 words
A color image forming apparatus wherein a plurality of developing units each containing a selected color of developer are supported on a supporting member, and a desired one of the plurality of the developing units is revolved to a predetermined developing station to develop a latent image corresponding to the desired one to provide a color image, said apparatus comprising: driving means for revolving the developing unit; detecting means for detecting at least one of a speed of revolution of the developing unit and a position of the developing unit; and control means for controlling an output of said driving means, said control means comparing a datum provided by said detecting means with a datum of a predetermined target movement scheme and controlling the output of said driving means to correct the difference therebetween.
Claim 3
Dependent Claim
23 words
An apparatus according to claim 1, wherein said target movement scheme includes a data table of target positions corresponding to constant time increments.
Claim 4
Dependent Claim
25 words
An apparatus according to claim 2, wherein a plurality of such position data tables are provided corresponding to amounts of revolution of the developing units.
Claim 5
Dependent Claim
54 words
An apparatus according to claim 1, wherein said movement scheme includes an acceleration mode wherein the developing unit is accelerated, a constant speed mode wherein the developing unit is moved at a costant speed and a deceleration mode wherein the developing unit is decelerated, and wherein selection can be made among the three modes.
Claim 6
Dependent Claim
23 words
An apparatus according to claim 1, wherein the amount of rotation is determined in accordance with selection of a color image formation mode.
References Cited (Backward Citations)
DE2850997A1
Cited
JPS57111555A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-10-06 | 1990-04-07 | 1990-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-10-06 | 1994-04-07 | 1994-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-10-06 | 1998-04-07 | 1998-10-07 | $7700.00 | Window Closed / Lapsed |