Patent DE533279C successfully refreshed from Google Patents.
Patent US2462668A successfully refreshed from Google Patents.
US5089846A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Positioning means for a pivotally mounted electrostatic image forming means
Assignee: Mitsubishi Electric Corp
•
Filing: 1991-02-11
•
Granted: 1992-02-18
•
Expires: 2011-02-11
Abstract
Abstract Electrostatic image forming device according to the present invention is contacted with a surface of a photosensitive drum by way of a positioning member so that it may follow the photosensitive drum in any eccentric condition, and consequently, the position thereof relative to the photosensitive drum is maintained constant, and accordingly, a recorded picture of a high quality is obtained. Further, since the relative positions of the electrostatic image forming device and the photosensitive drum are varied by adjustment of the positioning measure in response to opening and closing operation of an electrophotographic apparatus body, electrostatic image forming device having a short focal length can be used, and the overall size of the electrophotographic apparatus body can be reduced.
Inventors
- 👤 Hiroshi Tabuchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:28
CPC Classifications
G; G03; G03G; G03G21/00; G03G21/16; G03G21/18; G03G21/1803; G03G21/1817; G03G21/1821; G03G15/00; G03G15/04; G03G15/04036; G03G15/04045; G03G15/22; G03G15/32; G03G15/326; G03G21/1604; G03G21/1623; G03G21/1628; G03G21/1642; G03G21/1647; G03G21/1661; G03G21/1666; G03G2221/00; G03G2221/16; G03G2221/1636; G03G2221/1651; G03G2221/1654; G03G2221/1678; G03G2221/1687; G03G2221/18; G03G2221/183
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
188 words
An electrophotographic apparatus which includes a corona discharger for charging a surface of a photosensitive drum uniformly, electrostatic image forming means for exposing said photosensitive drum thus charged to light to form a latent image on said photosensitive drum, and a transfer device for transferring to record paper a developed image obtained by development of the latent image by means of a developing device, comprising a first holding member on which said electrostatic image forming means is mounted for pivotal motion toward and away from said photosensitive drum, positioning means mounted on said first holding member and having an end adapted to contact with said photosensitive drum to position said electrostatic image forming means with respect to said photosensitive drum, and a second holding member provided for pivotal motion on said first holding member by way of a spring, said second holding member urging said first holding member toward said photosensitive drum by way of said spring by means of a cam on the fixed side of an electrophotographic apparatus body when the opening and closing movable side of said electrophotographic apparatus body is in a closed condition.
Claim 2
Dependent Claim
188 words
An electrophotographic apparatus which includes a corona discharger for charging a surface of a photosensitive drum uniformly, electrostatic image forming means for exposing said photosensitive drum thus charged to light to form a latent image on said photosensitive drum, and a transfer device for transferring to record paper a developed image obtained by development of the latent image by means of a developing device, comprising a first holding member on which said electrostatic image forming means is mounted for pivotal motion toward and away from said photosensitive drum, positioning means mounted on said first holding member and having an end adapted to contact with said photosensitive drum to position said electrostatic image forming means with respect to said photosensitive drum, and a second holding member provided for pivotal motion on said first holding member by way of a spring, said second holding member urging said first holding member toward said photosensitive drum by way of said spring by means of a cam on the fixed side of an electrophotographic apparatus body when the opening and closing movable side of said electrophotographic apparatus body is in a closed condition.
Claim 3
Dependent Claim
31 words
An electrophotographic apparatus according to claim 1, wherein said positioning means is a positioning pin having a smoothly worked end portion adapted to contact with said surface of said photosensitive drum.
Claim 4
Dependent Claim
39 words
An electrophotographic apparatus according to claim 1, wherein said positioning means is a rotary body adapted to contact with and be rolled by said surface of said photosensitive drum, and a support member for holding said rotary body thereon.
Claim 5
Dependent Claim
45 words
An electrophotographic apparatus according to claim 3, wherein said rotary body of said positioning means is roller means which is supported for rotation at an end of said support member and adapted to contact with and be rotated by said surface of said photosensitive drum.
Claim 6
Dependent Claim
45 words
An electrophotographic apparatus according to claim 1 or 2, wherein a low friction member is provided in an integrated relationship at a contacting portion of said surface of said photosensitive drum at which said positioning means contacts and/or the contacting portion of said positioning means.
Claim 7
Dependent Claim
37 words
An electrophotographic apparatus according to claim 1, wherein said positioning means is mounted for adjustment in length on said first holding member to arbitrarily set the distance between said electrostatic image forming means and said photosensitive drum.
Claim 8
Dependent Claim
42 words
An electrophotographic apparatus according to claim 1, wherein said second holding member is divided so as to be composed of an engaging portion for engaging with said cam and an urging portion for urging said first holding member toward said photosensitive drum.
References Cited (Backward Citations)
US4258372A
Cited
US4257054A
Cited
JPS58139162A
Cited
JPS6258506A
Cited
US4849824A
Cited
US5006865A
Cited
US5005053A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-02-17 | 1995-08-19 | 1996-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-02-17 | 1999-08-19 | 2000-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-02-17 | 2003-08-19 | 2004-02-18 | $7700.00 | Window Closed / Lapsed |