US4380385A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of transferring toner powder image by pressure and apparatus therefor
Assignee: Minolta Co Ltd
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Filing: 1981-01-27
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Granted: 1983-04-19
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Expires: 2001-01-27
Abstract
Abstract The invention disclosed concerns a method and an apparatus for transferring a toner powder image from a toner image bearing member to a transfer paper by pressure. In transferring the toner image, a pressure roller is placed in contact with the surface of the toner image bearing member under a pressure of at least 20 kg/cm 2 and sliding is produced between the toner image bearing member and the transfer paper. Two different methods can be used to produce the sliding. The first method is to rotate the pressure roller at a speed different from the rotating speed of the toner image bearing member and the second method is to rotate the pressure roller so disposed to intersect its rotating axis with the rotating axis of the toner image member at an angle of about 0.5° to 2°.
Inventors
- 👤 Yoshihiro Ozaki
- 👤 Shuichiro Kaneko
- 👤 Masayuki Kuniyoshi
- 👤 Shoji Kondo
- 👤 Yasukuni Omata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:54
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/14; G03G15/16; G03G15/1665; G03G15/167
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
91 words
A method of transferring a toner powder image formed on a rotatable drum to an image receiving member by pressure, which comprises pressing a pressure roller against said rotatable drum under a pressure of at least about 20 kg/cm 2 and disposing said pressure roller to intersect its rotating axis with the rotating axis of said drum at an angle of about 0.5° to 2° for producing sliding between said rotatable drum and said image receiving member as said image receiving member is transported between said drum and said pressure roller.
Claim 2
Independent Claim
91 words
A method of transferring a toner powder image formed on a rotatable drum to an image receiving member by pressure, which comprises pressing a pressure roller against said rotatable drum under a pressure of at least about 20 kg/cm 2 and disposing said pressure roller to intersect its rotating axis with the rotating axis of said drum at an angle of about 0.5° to 2° for producing sliding between said rotatable drum and said image receiving member as said image receiving member is transported between said drum and said pressure roller.
Claim 3
Dependent Claim
41 words
A method as claimed in claim 1 wherein the toner image on the rotatable drum is formed obliquely in the rotating direction of the drum and said sliding is produced parallelly with respect to the rotating axis of said rotatable drum.
Claim 4
Dependent Claim
59 words
A method as claimed in claim 2 wherein the toner image on the rotatable drum is formed obliquely in the rotating direction of the drum by scanning an original in an oblique direction which forms an angle identical to said angle of about 0.5° to 2° relative to an imaginary line perpendicular to the rotating axis of the drum.
Claim 5
Independent Claim
145 words
A method of transferring a toner powder image from a rotatable toner image bearing member to a transfer paper by pressure, which comprises forming the toner image obliquely on said toner image bearing member in the rotating direction thereof; pressing a pressure roller having the circumferential surface of an elastic modulus of at least about 10 kg/mm 2 under a pressure of at least about 20 kg/cm 2 against said toner image bearing member; and rotating said pressure roller so disposed to intersect its rotating axis with the rotating axis of said toner image bearing member at an angle of about 0.5° to 2° for producing lateral sliding parallel to the rotating axis of said toner image bearing member between said toner image bearing member and said transfer paper as the transfer paper is transported between said toner image bearing member and said pressure roller.
Claim 6
Independent Claim
145 words
A method of transferring a toner powder image from a rotatable toner image bearing member to a transfer paper by pressure, which comprises forming the toner image obliquely on said toner image bearing member in the rotating direction thereof; pressing a pressure roller having the circumferential surface of an elastic modulus of at least about 10 kg/mm 2 under a pressure of at least about 20 kg/cm 2 against said toner image bearing member; and rotating said pressure roller so disposed to intersect its rotating axis with the rotating axis of said toner image bearing member at an angle of about 0.5° to 2° for producing lateral sliding parallel to the rotating axis of said toner image bearing member between said toner image bearing member and said transfer paper as the transfer paper is transported between said toner image bearing member and said pressure roller.
Claim 7
Independent Claim
192 words
An apparatus for transferring a toner powder image to a transfer paper by pressure, which comprises; a rotatable member onto which a toner image is to be formed; means for rotating said rotatable member; means for forming the toner image contracted or enlarged on said rotatable member in the rotating direction thereof; means for transferring the toner image including a pressure roller having a circumferential surface with an elastic modulus of at least about 10 kg/mm 2 and extending parallel to the rotating axis of said rotatable member and in contact with said rotatable member under a pressure of at least about 20 kg/cm 2 ; and means for rotating said pressure roller at a speed faster than the rotating speed of said rotatable member when the contracted toner image is formed and at a speed slower than the rotating speed of said rotatable member when the enlarged image is formed thereby producing sliding between said rotatable member and said transfer paper as the latter is transported between said rotatable member and said pressure roller, the amount of said sliding being about 0.67% to 27% of the length of the transfer paper.
Claim 8
Independent Claim
192 words
An apparatus for transferring a toner powder image to a transfer paper by pressure, which comprises; a rotatable member onto which a toner image is to be formed; means for rotating said rotatable member; means for forming the toner image contracted or enlarged on said rotatable member in the rotating direction thereof; means for transferring the toner image including a pressure roller having a circumferential surface with an elastic modulus of at least about 10 kg/mm 2 and extending parallel to the rotating axis of said rotatable member and in contact with said rotatable member under a pressure of at least about 20 kg/cm 2 ; and means for rotating said pressure roller at a speed faster than the rotating speed of said rotatable member when the contracted toner image is formed and at a speed slower than the rotating speed of said rotatable member when the enlarged image is formed thereby producing sliding between said rotatable member and said transfer paper as the latter is transported between said rotatable member and said pressure roller, the amount of said sliding being about 0.67% to 27% of the length of the transfer paper.
Claim 9
Independent Claim
141 words
An apparatus for transferring a toner powder image to a transfer paper by pressure, which comprises: a rotatable member onto which a toner image is to be formed; means for rotating said rotatable member; means for forming the toner image obliquely on said rotatable member in the rotating direction thereof; means for transferring the toner image including a pressure roller in contact with the surface of said rotataber under a pressure of at least about 20 kg/cm 2 and so disposed to intersect its rotating axis with the rotating axis of said rotatable member at an angle of about 0.5° to 2° for producing lateral sliding parallel to the rotating axis of said rotatable member between said rotatable member and said transfer paper as the latter is transported between said rotatable member and said pressure roller both of which are rotating.
Claim 10
Independent Claim
141 words
An apparatus for transferring a toner powder image to a transfer paper by pressure, which comprises: a rotatable member onto which a toner image is to be formed; means for rotating said rotatable member; means for forming the toner image obliquely on said rotatable member in the rotating direction thereof; means for transferring the toner image including a pressure roller in contact with the surface of said rotataber under a pressure of at least about 20 kg/cm 2 and so disposed to intersect its rotating axis with the rotating axis of said rotatable member at an angle of about 0.5° to 2° for producing lateral sliding parallel to the rotating axis of said rotatable member between said rotatable member and said transfer paper as the latter is transported between said rotatable member and said pressure roller both of which are rotating.
Claim 11
Dependent Claim
27 words
An apparatus as claimed in claim 6 wherein said pressure roller has the circumferential surface with an elastic modulus of at least about 10 kg/mm 2 .
Claim 12
Independent Claim
204 words
An apparatus for transferring a toner powder image to a transfer paper by pressure, which comprises; a rotatable member onto which a toner image is to be formed; means for rotating said rotatable member; means for applying a lubricant to the surface of said rotatable member; means for forming the toner image contracted or enlarged on said rotatable member in the rotating direction thereof; means for transferring the toner image including a pressure foller having a circumferential surface with an elastic modulus of at least about 10 kg/mm 2 and extending parallel to the rotating axis of said rotatable member and in contact with said rotatable member under a pressure of at least about 20 kg/cm 2 ; and means for rotating said pressure roller at a speed faster than the rotating speed of said rotatable member when the contracted toner image is formed and at a speed slower than the rotating speed of said rotatable member when the enlarged image is formed thereby producing sliding between said rotatable member and said transfer paper as the latter is transported between said rotatable member and said pressure roller, the amount of said sliding being about 0.67% to 27% of the length of the transfer paper.
Claim 13
Independent Claim
204 words
An apparatus for transferring a toner powder image to a transfer paper by pressure, which comprises; a rotatable member onto which a toner image is to be formed; means for rotating said rotatable member; means for applying a lubricant to the surface of said rotatable member; means for forming the toner image contracted or enlarged on said rotatable member in the rotating direction thereof; means for transferring the toner image including a pressure foller having a circumferential surface with an elastic modulus of at least about 10 kg/mm 2 and extending parallel to the rotating axis of said rotatable member and in contact with said rotatable member under a pressure of at least about 20 kg/cm 2 ; and means for rotating said pressure roller at a speed faster than the rotating speed of said rotatable member when the contracted toner image is formed and at a speed slower than the rotating speed of said rotatable member when the enlarged image is formed thereby producing sliding between said rotatable member and said transfer paper as the latter is transported between said rotatable member and said pressure roller, the amount of said sliding being about 0.67% to 27% of the length of the transfer paper.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-04-18 | 1986-10-18 | 1987-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-04-18 | 1990-10-18 | 1991-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-04-18 | 1994-10-18 | 1995-04-19 | $7700.00 | Window Closed / Lapsed |