EP0096450A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Electrophotographic copier
Assignee: Olivetti SpA
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Filing: 1982-02-10
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Granted: —
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Expires: 2002-02-10
Abstract
Abstract The photocopier uses a magnetic brush unit (32) develop the image on a photoconductive drum (26). developed image is transferred to a sheet of paper (39). photocopier employs a toner fixing system operating c and under pressure by means of a pair of rollers (56, to whose axes are slightly skewed relative to each other. The rhe rollers have different diameters but rotate at the same The angula speed in order to create slippage of the upper roller old relativ to the lower roller for the purpose of obtaining 58) perfecry flat copies in spite of the skew of the rollers.
Inventors
- 👤 Bruno Borgata Paradiso Cestari
- 👤 Riccardo Forlani
- 👤 Piero Gontero
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 01:24
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/80; G03G15/06; G03G15/08; G03G15/09; G03G15/0921; G03G15/0928; G03G15/20; G03G15/2092
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
128 words
An electrophotographic copier comprising means (32) for developing a latent image of an original to be reproduced and formed on a photoconductor element (24, 26), means (34) for transferring the developed image on to a sheet of paper (39), and a pair of opposing rollers (56, 58) for the cold-fixing of the image transferred on to the paper sheet, by the action of the pressure between the rollers, and in which the rollers have their axes inclined to each other and at least one roller has a rough surface, characterised in that the roller (58) with the rough surface has a peripheral speed greater than the opposing roller (56) of the pair, so that any deformation of the sheet caused by the inclination of the rollers is nullified.
Claim 2
Dependent Claim
128 words
An electrophotographic copier comprising means (32) for developing a latent image of an original to be reproduced and formed on a photoconductor element (24, 26), means (34) for transferring the developed image on to a sheet of paper (39), and a pair of opposing rollers (56, 58) for the cold-fixing of the image transferred on to the paper sheet, by the action of the pressure between the rollers, and in which the rollers have their axes inclined to each other and at least one roller has a rough surface, characterised in that the roller (58) with the rough surface has a peripheral speed greater than the opposing roller (56) of the pair, so that any deformation of the sheet caused by the inclination of the rollers is nullified.
Claim 3
Dependent Claim
37 words
A copier as claimed in claim 1, characterised in that the rollers (56, 58) rotate at the same angular speed in opposite directions and the rough roller (58) has a greater diameter than the opposing roller (56).
Claim 4
Dependent Claim
31 words
A copier as claimed in claim 1 or 2, characterised in that the rough roller (58) slips on the opposing roller (56) with a slippage ratio of between 0.001 and 0.003.
Claim 5
Dependent Claim
74 words
A copier as claimed in any of claims 1 to 3, characterised in that the said opposing roller (56) is lubricated with silicone oil by means of a lubricating element formed from a spongy member (160) enclosed within a fabric (162) provided with pile fibres (168) on its outer face, so that the 0_1 is transferred, by contact, to the rough roller (58) in ordar to prevent toner particles adhering to the surface thereof.
Claim 6
Dependent Claim
30 words
A copier as claimed in claim 4, characterised in that the fabric (162) is a velvet having a layer of pile fibres of length from 1 mm to 10 mm.
References Cited (Backward Citations)
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