US4959685A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Image forming apparatus provided with a sheet storing unit
Assignee: Minolta Co Ltd
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Filing: 1990-02-27
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Granted: 1990-09-25
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Expires: 2010-02-27
Abstract
Abstract An image forming apparatus comprising a tray for receiving sheets with an image, which is movable up toward and down away from a sheet ejection portion of a transport path, the tray being moved down intermittently in accordance with the volume of sheets stacked thereon. When a signal commanding an image forming operation is generated, the tray is moved to a proper position, where the upper surface of the tray or the upper surface of sheets stacked thereon is positioned below the sheet ejection portion with a specified space, and during the movement of the tray, the image forming operation is kept standing by. The tray is moved to the proper position when the volume of the sheet stack is varied during the image forming operation. The transport path for leading sheets ejected from a copying machine to the tray comprises a first transport section for ejecting sheets onto the tray and a second transport section arranged upstream of the first transport section, and when a sheet is about to be ejected to the tray, the travel speed of the sheet is reduced from a first speed to a second speed. When the next sheet comes into the second transport section during the transportation of the former sheet in the first transport section at the second speed, the travel speed of the former sheet in the first transport section is returned to the first speed.
Inventors
- 👤 Akio Kato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:49
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/65; G03G15/6538; B; B65; B65H; B65H31/00; B65H31/02; B65H31/26; G03G15/6552; B65H2301/00; B65H2301/40; B65H2301/42; B65H2301/421; B65H2301/4214; B65H2301/42146; B65H2404/00; B65H2404/60; B65H2404/69; B65H2404/696; G03G2215/00; G03G2215/00362; G03G2215/00789; G03G2215/00793; G03G2215/00822; G03G2215/00827; G03G2215/00886; G03G2215/0089
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
159 words
An image forming apparatus comprising: means for forming an image on a sheet; means for generating a signal commanding said image forming means to perform an image forming operation; a tray for receiving sheets, which is movable up and down; means for transporting sheets ejected from said image forming means to said tray; drive means for moving up and down said tray toward and away from a sheet ejection portion of said transporting means; first control means for commanding said drive means to move said tray to a proper position, where the upper surface of said tray or the upper surface of sheets stacked thereon is positioned below the sheet ejection portion of said transporting means with a specified space, when said commanding means generates a command signal to start an image forming operation: and second control means for inhibiting the image forming operation while said drive means is in operation at the request of said first control means.
Claim 2
Dependent Claim
159 words
An image forming apparatus comprising: means for forming an image on a sheet; means for generating a signal commanding said image forming means to perform an image forming operation; a tray for receiving sheets, which is movable up and down; means for transporting sheets ejected from said image forming means to said tray; drive means for moving up and down said tray toward and away from a sheet ejection portion of said transporting means; first control means for commanding said drive means to move said tray to a proper position, where the upper surface of said tray or the upper surface of sheets stacked thereon is positioned below the sheet ejection portion of said transporting means with a specified space, when said commanding means generates a command signal to start an image forming operation: and second control means for inhibiting the image forming operation while said drive means is in operation at the request of said first control means.
Claim 3
Dependent Claim
56 words
An image forming apparatus as claimed in claim 1, further comprising means for detecting whether said tray is at the proper position or not, wherein said second control means further cancels the inhibition of the image forming operation when said tray position detect means generates a signal indicating that the tray is at the proper position.
Claim 4
Dependent Claim
172 words
An image forming apparatus comprising: means for forming an image on a sheet; means for generating a signal commanding said image forming means to perform an image forming operation; a tray for receiving sheets, which is movable up and down; means for transporting sheets ejected from said image forming means to said tray; drive means for moving up and down said tray toward and away from a sheet ejection portion of said transporting means; means for detecting the volume of sheets stacked on said tray; first control means for commanding said drive means to move down said tray in accordance with the volume of sheets stacked on said tray; and second control means for commanding said drive means to move said tray to a proper position, where the upper surface of said tray or the upper surface of sheets stacked thereon is positioned below the sheet ejection portion of said transporting means with a specified space, when the volume of sheets stacked on said tray is varied during an image forming operation.
Claim 5
Dependent Claim
172 words
An image forming apparatus comprising: means for forming an image on a sheet; means for generating a signal commanding said image forming means to perform an image forming operation; a tray for receiving sheets, which is movable up and down; means for transporting sheets ejected from said image forming means to said tray; drive means for moving up and down said tray toward and away from a sheet ejection portion of said transporting means; means for detecting the volume of sheets stacked on said tray; first control means for commanding said drive means to move down said tray in accordance with the volume of sheets stacked on said tray; and second control means for commanding said drive means to move said tray to a proper position, where the upper surface of said tray or the upper surface of sheets stacked thereon is positioned below the sheet ejection portion of said transporting means with a specified space, when the volume of sheets stacked on said tray is varied during an image forming operation.
Claim 6
Dependent Claim
52 words
An image forming apparatus as claimed in claim 3, wherein said sheet volume detection means includes a sensor which detects whether the upper surface of said tray or the upper surface of sheets stacked thereon is positioned below the sheet ejection portion of said transporting means with a specified space or not.
Claim 7
Dependent Claim
157 words
An image forming apparatus comprising: means for forming an image on a sheet; a tray for receiving sheets; a transport path for leading sheets ejected from said image forming means to said tray, which includes a first transport section for ejecting the sheets onto said tray and a second transport section arranged upstream of said first transport section; means for detecting a sheet traveling in said transport path first control means for reducing the speed of a sheet traveling in said first transport section from a first speed to a second speed when the sheet is about to be ejected from said first transport section to said tray; and second control means for increasing the speed of a sheet traveling in said first transport section from the second speed to a third speed when the next sheet is detected traveling in said second transport section during the operation of said first transport section at the second speed.
Claim 8
Dependent Claim
157 words
An image forming apparatus comprising: means for forming an image on a sheet; a tray for receiving sheets; a transport path for leading sheets ejected from said image forming means to said tray, which includes a first transport section for ejecting the sheets onto said tray and a second transport section arranged upstream of said first transport section; means for detecting a sheet traveling in said transport path first control means for reducing the speed of a sheet traveling in said first transport section from a first speed to a second speed when the sheet is about to be ejected from said first transport section to said tray; and second control means for increasing the speed of a sheet traveling in said first transport section from the second speed to a third speed when the next sheet is detected traveling in said second transport section during the operation of said first transport section at the second speed.
Claim 9
Dependent Claim
20 words
An image forming apparatus as claimed in claim 5, wherein the third speed is the same as the first speed.
Claim 10
Dependent Claim
39 words
An image forming apparatus as claimed in claim 5, said sheet detect means has a first sensor between said first transport section and said second transport section and a second sensor at the upstream of said second transport section.
Claim 11
Dependent Claim
22 words
An image forming apparatus as claimed in claim 5, wherein said first transport section and said second transport section have rollers respectively.
Claim 12
Dependent Claim
44 words
An image forming apparatus as claimed in claim 8, wherein said first transport section includes a pair of rollers for ejecting sheets to said tray, and said second transport section includes a pair of rollers for receiving sheets ejected from said image forming apparatus.
Claim 13
Dependent Claim
59 words
An image forming apparatus as claimed in claim 9, wherein said first control means reduces the speed of said pair of ejection rollers to the second speed immediately before the trailing edge of a sheet passes said pair of ejection rollers, and said pair of ejection rollers maintains the second speed until the sheet is ejected onto said tray.
References Cited (Backward Citations)
US3682328A
Cited
US3685712A
Cited
US3690537A
Cited
US4557595A
Cited
JPS6031463A
Cited
US4718657A
Cited
JPS60206769A
Cited
US4569514A
Cited
US4601570A
Cited
JPS61295970A
Cited
US4886259A
Cited
US4864350A
Cited
US4852867A
Cited
US4801133A
Cited
US4811048A
Cited
US4855787A
Cited
US4905053A
Cited
US4901994A
Cited
US4893152A
Cited
US4843434A
Cited
US4905055A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-09-24 | 1994-03-26 | 1994-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-09-24 | 1998-03-26 | 1998-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-09-24 | 2002-03-26 | 2002-09-25 | $7700.00 | Window Closed / Lapsed |