US5041878A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for forming and transferring color images
Assignee: Sharp Corp
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Filing: 1989-12-27
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Granted: 1991-08-20
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Expires: 2009-12-27
Abstract
Abstract In a transfer method of a colored image, the process speed is initially properly set in accordance with the size of a copy paper sheet to be used. The transfer voltage is then changed in accordance with the process speed. After these processes, a colored toner image formed on a photoconductor is first transferred onto an intermediate transfer medium and then further transferred onto the copy paper sheet.
Inventors
- 👤 Yasuhiro Takai
- 👤 Taisuke Kamimura
- 👤 Yoichi Shimazawa
- 👤 Etsuzi Nukushina
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:49
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/01; G03G15/0105; G03G15/0131; G03G15/14; G03G15/16; G03G15/1605
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
79 words
A transfer method for colored images comprising the steps of: (a) changing a process speed in accordance with a size of a copy sheet to be used; (b) changing a transfer voltage, which is always greater than zero, in accordance with said process speed; (c) first transferring at least one colored toner image formed on a photoconductor onto an intermediate transfer medium; and (d) secondly transferring the colored toner image from the intermediate transfer medium onto the copy sheet.
Claim 2
Dependent Claim
79 words
A transfer method for colored images comprising the steps of: (a) changing a process speed in accordance with a size of a copy sheet to be used; (b) changing a transfer voltage, which is always greater than zero, in accordance with said process speed; (c) first transferring at least one colored toner image formed on a photoconductor onto an intermediate transfer medium; and (d) secondly transferring the colored toner image from the intermediate transfer medium onto the copy sheet.
Claim 3
Dependent Claim
96 words
A transfer method of a colored image comprising the steps of: (a) changing a process speed in accordance with a size of a copy paper sheet to be used, wherein said process speed ranges between 115 and 184 mm/sec (b) changing a transfer voltage in accordance with said process speed, wherein said transfer voltage ranges between 1.1 and 2.0 KV (c) first transferring at least one colored toner image formed on a photoconductor onto an intermediate transfer medium; and (d) secondly transferring said colored toner image from the intermediate transfer medium onto said copy paper sheet.
Claim 4
Dependent Claim
96 words
A transfer method of a colored image comprising the steps of: (a) changing a process speed in accordance with a size of a copy paper sheet to be used, wherein said process speed ranges between 115 and 184 mm/sec (b) changing a transfer voltage in accordance with said process speed, wherein said transfer voltage ranges between 1.1 and 2.0 KV (c) first transferring at least one colored toner image formed on a photoconductor onto an intermediate transfer medium; and (d) secondly transferring said colored toner image from the intermediate transfer medium onto said copy paper sheet.
Claim 5
Dependent Claim
11 words
The method of claim 1 wherein the copy sheet is paper.
Claim 6
Dependent Claim
87 words
A transfer method for transferring colored images onto a copy sheet comprising the steps of: (a) varying a process speed dependant on the size of a copy sheet to be used; (b) first transferring at lest one colored toner image formed on a photoconductor onto an intermediate transfer medium; and (c) secondly transferring the colored toner image from the intermediate transfer medium onto the copy sheet; and (d) using a varying transfer voltage which is always greater than zero dependent on the process speed in step (c).
Claim 7
Dependent Claim
87 words
A transfer method for transferring colored images onto a copy sheet comprising the steps of: (a) varying a process speed dependant on the size of a copy sheet to be used; (b) first transferring at lest one colored toner image formed on a photoconductor onto an intermediate transfer medium; and (c) secondly transferring the colored toner image from the intermediate transfer medium onto the copy sheet; and (d) using a varying transfer voltage which is always greater than zero dependent on the process speed in step (c).
Claim 8
Dependent Claim
24 words
The method of claim 4 wherein the transfer voltage is varied by increasing its amount when the amount of process speed has been increased.
Claim 9
Dependent Claim
14 words
The method of claim 4 wherein the photoconductor in step (b) is a belt.
Claim 10
Dependent Claim
13 words
The method of claim 4 wherein the intermediate transfer medium is a belt.
Claim 11
Dependent Claim
15 words
The method of claim 4 wherein the transfer voltage is applied to the transfer medium.
Claim 12
Dependent Claim
16 words
The method of claim 4 wherein the transfer voltage is applied directly to a transfer roller.
Claim 13
Dependent Claim
18 words
The method of claim 9 wherein there is a variable power source operatively connected to the transfer roller.
Claim 14
Dependent Claim
20 words
The method of claim 4 further comprising the step of (e) separating the copy sheet from the intermediate transfer medium.
Claim 15
Dependent Claim
16 words
The method of claim 11 wherein step (e) is performed by the use of a plate.
Claim 16
Dependent Claim
32 words
The method of claim 4 further comprising the step applying a separating plate to the transfer medium and the copy sheet to effectuate separation of the transfer medium from the copy sheet.
Claim 17
Dependent Claim
11 words
The method of claim 4 wherein the copy sheet is paper.
Claim 18
Dependent Claim
13 words
The method of claim 4 wherein the process speed is about 184 mm/sec.
Claim 19
Dependent Claim
17 words
The method of claim 15 wherein the transfer voltage is in the range of about 1.5-2.0 KV.
Claim 20
Dependent Claim
13 words
The method of claim 4 wherein the process speed is about 115 mm/sec.
Claim 21
Dependent Claim
17 words
The method of claim 17 wherein the transfer voltage is in the range of about 1.1-1.5 KV.
Claim 22
Dependent Claim
37 words
The method of claim 4 wherein the size of the copy sheet can vary from small to large and when the copy sheet size is reduced, the process speed is increased and the transfer voltage is increased.
Claim 23
Dependent Claim
37 words
The methods of claim 4 wherein the size of the copy sheet can vary from small to large and when the copy sheet size is increased the process speed is reduced and the transfer voltage is reduced.
Claim 24
Dependent Claim
146 words
A transfer method for toner images comprising the steps of: (a) determining a size of a copy sheet to be used; (b) performing an image formation at a first process speed when a copy sheet of a first size is used and at a second process speed faster than said first process speed when a copy sheet of a second size smaller than said first size is used; and (c) applying a first voltage to a transfer means so that a toner image formed on a recording medium in accordance with said first process speed is transferred onto the copy sheet of said first size and applying a second voltage higher than said first voltage to said transfer means so that a toner image formed on said recording medium in accordance with said second process speed is transferred onto the copy sheet of said second size.
Claim 25
Dependent Claim
146 words
A transfer method for toner images comprising the steps of: (a) determining a size of a copy sheet to be used; (b) performing an image formation at a first process speed when a copy sheet of a first size is used and at a second process speed faster than said first process speed when a copy sheet of a second size smaller than said first size is used; and (c) applying a first voltage to a transfer means so that a toner image formed on a recording medium in accordance with said first process speed is transferred onto the copy sheet of said first size and applying a second voltage higher than said first voltage to said transfer means so that a toner image formed on said recording medium in accordance with said second process speed is transferred onto the copy sheet of said second size.
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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) | 1994-08-19 | 1995-02-18 | 1995-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-08-19 | 1999-02-18 | 1999-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-08-19 | 2003-02-18 | 2003-08-20 | $7700.00 | Window Closed / Lapsed |