Patent US2770711A successfully refreshed from Google Patents.
US4945374A
Expired / Lapsed
US
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Pressure developing device
Assignee: Brother Industries Ltd
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Filing: 1989-04-28
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Granted: 1990-07-31
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Expires: 2009-04-28
Abstract
Abstract In a pressure developing device employed in an imaging device like a duplicating machine, an optical printer etc, pressure force for pressurizing a recording medium is capable of being varied in accordance with the width of the recording medium to be pressurized. A sensor for detecting the width of the recording medium is provided, and the pressure force is varied based upon the detected value.
Inventors
- 👤 Takemi Yamamoto
- 👤 Hiroshi Kawahara
- 👤 Yumio Matsumoto
- 👤 Shigeyuki Hayashi
- 👤 Kiyoharu Hayakawa
- 👤 Osamu Takagi
- 👤 Yuji Asano
- 👤 Takao Nakazawa
- 👤 Shunichi Higashiyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:28
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/002; G03F7/0022; G03B; G03B2227/00; G03B2227/32; G03B2227/325
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
137 words
A pressure developing device having a pair of pressure rollers being adapted to be brought into and out of contact with each other for pressurizing an exposed recording sheet containing a plurality of photo-sensitive microcapsules each containing a component to change the rupture strength thereof when exposed to light and a developing sheet coated with a developer material to develope a visible image, said pressure developing device further comprising: detect means for detecting width of the developing sheet to be pressurized by said pair of rollers; and control means for controlling said pair of rollers so as to pressurize an area corresponding to the width detected by said detect means of the recording sheet and the developing sheet with a predetermined pressure force while pressurize the other area with pressure force less than said predetermined pressure force.
Claim 2
Dependent Claim
137 words
A pressure developing device having a pair of pressure rollers being adapted to be brought into and out of contact with each other for pressurizing an exposed recording sheet containing a plurality of photo-sensitive microcapsules each containing a component to change the rupture strength thereof when exposed to light and a developing sheet coated with a developer material to develope a visible image, said pressure developing device further comprising: detect means for detecting width of the developing sheet to be pressurized by said pair of rollers; and control means for controlling said pair of rollers so as to pressurize an area corresponding to the width detected by said detect means of the recording sheet and the developing sheet with a predetermined pressure force while pressurize the other area with pressure force less than said predetermined pressure force.
Claim 3
Dependent Claim
48 words
The pressure developing device according to claim 1 wherein said control means comprises a plurality of backup rollers provided in parallel to at least one of said pair of rollers, each of said backup rollers respectively applying pressure force to at least one of said pair of rollers.
Claim 4
Dependent Claim
30 words
The pressure developing device according to claim 2 wherein said control means further comprises a plurality of elastic springs for respectively applying pressure force to each of said backup rollers.
Claim 5
Dependent Claim
27 words
The pressure developing device according to claim 3 wherein said control means further comprises a motor and a gear head for varying the length of said springs.
Claim 6
Dependent Claim
38 words
The pressure developing device according to claim 3 wherein said control means further comprises a plurality of cams, said pressure force to be applied to said backup rollers being varied in accordance with the diameters of said cams.
Claim 7
Dependent Claim
46 words
The pressure developing device according to claim 2 wherein said control means further comprises an oil chamber filled with oil for applying pressure force to each of said backup rollers and pistons for transmitting pressure force from said oil chamber to each of said backup rollers.
Claim 8
Dependent Claim
50 words
The pressure developing device according to claim 3 wherein said control means further comprises a camshaft provided in parallel to said backup rollers including a plurality of cam portions, said pressure force to be applied to said backup rollers being varied in accordance with the diameters of said cam positions.
Claim 9
Dependent Claim
33 words
The pressure developing device according to claim 1 wherein said control means further controls said pair of rollers so as to pressurize the desired ares of said recording sheet with said developing sheet.
Claim 10
Dependent Claim
20 words
The pressure developing device according to claim 8 wherein said desired area is the exposed area of said recording sheet.
Claim 11
Dependent Claim
104 words
A pressure developing device having a pair of pressure rollers being adapted to be brought into and out of contact with each other for pressurizing an exposed recording medium to develop a visible image, said pressure developing device further comprising: detect means for detecting width of the recording medium to be pressurized by said pair of rollers; and control means for controlling said pair of rollers so as to pressurize an area corresponding to the width detected by said detect means of the recording medium with a predetermined pressure force while pressurize the other area with pressure force less than said predetermined pressure force.
Claim 12
Dependent Claim
104 words
A pressure developing device having a pair of pressure rollers being adapted to be brought into and out of contact with each other for pressurizing an exposed recording medium to develop a visible image, said pressure developing device further comprising: detect means for detecting width of the recording medium to be pressurized by said pair of rollers; and control means for controlling said pair of rollers so as to pressurize an area corresponding to the width detected by said detect means of the recording medium with a predetermined pressure force while pressurize the other area with pressure force less than said predetermined pressure force.
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) | 1993-07-30 | 1994-01-29 | 1994-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-30 | 1998-01-29 | 1998-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-30 | 2002-01-29 | 2002-07-31 | $7700.00 | Window Closed / Lapsed |