Patent US3875581A successfully refreshed from Google Patents.
US3875581A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Developing device for copying apparatus of the diazo type
Assignee: Ricoh Co Ltd
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Filing: 1973-06-26
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Granted: 1975-04-01
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Expires: 1993-06-26
Abstract
Abstract A device comprising a developing liquid quantity control member operatively associated with a developing liquid supply roller for adjusting to an optimum level the quantity of a nonvolatile, concentrated developing liquid supplied to a developing position between a developing liquid applicator roller and a pressure applying roller so as to apply an essential minimum of the developing liquid to an exposed photosensitive sheet of the diazo type fed to the developing position. There is also provided a developing liquid removal member disposed posteriorly to the developing position for removing from the periphery of the developing liquid applicator roller any excess developing liquid which might otherwise remain thereon.
Inventors
- 👤 Tadashi Yamashita
- 👤 Yasuhiro Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:20
CPC Classifications
G; G03; G03D; G03D5/00; G03D5/06; G03D5/067
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
228 words
A developing device for copying apparatus of the diazo type comprising: a. an rotating applicator roller having a peripheral surface for applying a non-volatile concentrated developing liquid to a diazo photosensitive sheet exposed to an optical image of an original to be duplicated; b. a supply roller having a peripheral surface maintained in pressing engagement with said peripheral surface of the applicator roller to form therebetween an engaging position and rotating at approximately the same peripheral velocity as said applicator roller for supplying the developing liquid to the applicator roller; c. a control member maintained in pressing engagement with said peripheral surface of the supply roller in a position disposed anterior to the engaging position of said surfaces of the applicator and supply rollers along their paths of rotation for adjusting the quantity of the developing liquid supplied to the applicator roller; d. a pressing member maintained in pressing engagement with said applicator roller to form therebetween a developing position through which a diazo photosensitive sheet passes to be developed; and e. a removal member maintained in pressing engagement with said peripheral surface of the applicator roller in a position disposed posterior to the developing position along its path of rotation so as to remove any excess developing liquid from the applicator roller after a developing operation is performed and before any further developing liquid is supplied thereto.
Claim 2
Dependent Claim
228 words
A developing device for copying apparatus of the diazo type comprising: a. an rotating applicator roller having a peripheral surface for applying a non-volatile concentrated developing liquid to a diazo photosensitive sheet exposed to an optical image of an original to be duplicated; b. a supply roller having a peripheral surface maintained in pressing engagement with said peripheral surface of the applicator roller to form therebetween an engaging position and rotating at approximately the same peripheral velocity as said applicator roller for supplying the developing liquid to the applicator roller; c. a control member maintained in pressing engagement with said peripheral surface of the supply roller in a position disposed anterior to the engaging position of said surfaces of the applicator and supply rollers along their paths of rotation for adjusting the quantity of the developing liquid supplied to the applicator roller; d. a pressing member maintained in pressing engagement with said applicator roller to form therebetween a developing position through which a diazo photosensitive sheet passes to be developed; and e. a removal member maintained in pressing engagement with said peripheral surface of the applicator roller in a position disposed posterior to the developing position along its path of rotation so as to remove any excess developing liquid from the applicator roller after a developing operation is performed and before any further developing liquid is supplied thereto.
Claim 3
Dependent Claim
18 words
A device according to claim 1 wherein said control member and said removal member are both doctor blades.
Claim 4
Dependent Claim
22 words
A device according to claim 1 wherein said control member is a squeeze roller, and said removal member is a doctor blade.
Claim 5
Dependent Claim
21 words
A device according to claim 1 wherein said control member is a doctor blade, and said removal member is a roller.
Claim 6
Dependent Claim
36 words
A device according to claim 1 wherein said applicator roller is of a rubber material having a hardness in a range from 40* to 70* and a mean surface coarseness of less than 3 Mu Ra.
Claim 7
Dependent Claim
39 words
A device according to claim 1 wherein said supply roller is of rubber material having a hardness in a range form 40* to 60* and the average surface coarseness is in a range between 3 and 4 Mu Ra.
Claim 8
Dependent Claim
101 words
A device according to claim 1 further comprising operating means for releasing said pressing member, said applicator roller and said supply roller from pressing engagement with one another and releasing said control member and said removal member from pressing engagement with said supply roller and said applicator roller respectively when the Developing device is rendered inoperative, and for bringing said pressing member, said applicator roller and said supply roller into pressing engagement with one another said control member and said removal member into pressing engagement with said supply roller and said applicator roller respectively when the developing device is rendered operative.
Claim 9
Dependent Claim
227 words
A device according to claim 7 wherein said pressing member comprises a pressing roller whose axis lies on a line with the axes of said applicator roller and said supply roller, and said operating means comprises a lever means having a pressure roller on one end for engaging said pressing roller, and pivotable for pressing said pressure roller against said pressing roller to bring said pressing, applicator, and supply rollers into pressing engagement with each other, first mounting means for said removal member, second mounting means for said control member, two rotatably cooperating segmental gears respectively mounting said first and second mounting means and respectively disposed adjacent said applicator roller and siad supply roller such that upon rotation of said two segmental gears, said removal and control members will be respectively brought into pressing engagement therewith, crank means operatively coupled at one end to said two segmental gears for rotating said gears and operatively coupled at the other end to said lever means for transmitting the pivoting of said lever means into rotation of said two segmental gears, and actuation means for pivoting said lever means whereby said pressing roller, said applicator roller, and said supply roller are brought into pressing engagement with one another and said control member and said removal member are brought into pressing engagement with said supply roller and said applicator roller respectively.
Claim 10
Dependent Claim
34 words
A device according to claim 8 wherein said actuation means comprises a solenoid having an actuator, and toggle-linkage means connected to said actuator for pivoting said lever means upon the actuation of said solenoid.
Claim 11
Dependent Claim
32 words
A device according to claim 8 wherein said actuation means comprises a solenoid having an actuator, and an hydraulic transmission means for pivoting said lever means upon the actuation of said solenoid.
Claim 12
Dependent Claim
40 words
A device according to claim 8 wherein said crank means comprises two links pivotally connected at one end to each other and each connected at its other end respectively to said lever means and one of said two segmental gears.
Claim 13
Dependent Claim
35 words
A device according to claim 8 wherein said crank means comprises two links each connected at one end to said lever means and at the other end respectively to one of said two segmental gears.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |