US5398101A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Image forming apparatus capable of copying images on various copy items
Assignee: Kyocera Mita Industrial Co Ltd
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Filing: 1994-05-16
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Granted: 1995-03-14
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Expires: 2014-05-16
Abstract
Abstract An image forming apparatus includes a toner image forming device for forming a toner image corresponding to an image of an original document at a set operative copying magnification, a transfer device for transferring the toner image onto a copy item, a fixing device for fixing the toner image on the copy item under heat, a memory for storing correction values for a plurality of types of copy item usable in the image forming apparatus respectively, the correction value being adapted for correcting a change in length of a copy item due to the heat of the fixing device, a judge device for judging what type the present copy item is of, and a magnification setting device for setting an operative copying magnification to correct a shrink of the present copy item due to the fixing heat.
Inventors
- 👤 Akihiro Takada
- 👤 Masahiko Fukano
- 👤 Tetsuya Kagawa
- 👤 Koji Izumi
- 👤 Hiroshi Kageyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:55
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/50; G03G15/5095; G03G15/20; G03G15/2003; H; H04; H04N; H04N1/00; H04N1/23; H04N1/29; H04N1/295
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
170 words
An image forming apparatus comprising: toner image forming means for forming a toner image corresponding to an image of an original document at a set operative copying magnification; transfer means for transferring the toner image onto a copy item; fixing means for fixing the toner image on the copy item under heat; storage means for storing correction values for a plurality of types of copy item usable in the image forming apparatus respectively, the correction values being adapted for correcting a change in length of a copy item due to the heat of the fixing means; judge means for judging what type a present copy item is of; and magnification setting means for setting an operative copying magnification for the toner image forming means, the magnification setting means including: nominal copying magnification setting means for setting a nominal copying magnification; correcting means for reading a correction value corresponding to the judged copy item type from the storage means and correcting the set nominal copying magnification into the operative copying magnification.
Claim 2
Dependent Claim
170 words
An image forming apparatus comprising: toner image forming means for forming a toner image corresponding to an image of an original document at a set operative copying magnification; transfer means for transferring the toner image onto a copy item; fixing means for fixing the toner image on the copy item under heat; storage means for storing correction values for a plurality of types of copy item usable in the image forming apparatus respectively, the correction values being adapted for correcting a change in length of a copy item due to the heat of the fixing means; judge means for judging what type a present copy item is of; and magnification setting means for setting an operative copying magnification for the toner image forming means, the magnification setting means including: nominal copying magnification setting means for setting a nominal copying magnification; correcting means for reading a correction value corresponding to the judged copy item type from the storage means and correcting the set nominal copying magnification into the operative copying magnification.
Claim 3
Dependent Claim
55 words
An image forming apparatus as defined in claim 1 further comprising: a plurality of copy item holders for holding different types of copy items respectively; manual selection means for selecting a desired type of copy item manually; wherein the judge means is responsive to the manual selection means to judge the type of copy item.
Claim 4
Dependent Claim
46 words
An image forming apparatus as defined in claim 1 further comprising: a copy item holder for holding a copy item; wherein the judge means includes detection means provided on the copy item holder for detecting the type of copy item placed in the copy item holder.
Claim 5
Dependent Claim
30 words
An image forming apparatus as defined in claim 3 wherein the detection means includes a detector for detecting the material of copy item to judge the type of copy item.
Claim 6
Dependent Claim
53 words
An image forming apparatus as defined in claim 3 wherein: the copy item holder is further provided with an identification member for identifying the type of copy item placed in the copy item holder; and the detection means includes a detector for detecting the identification member to judge the type of copy item.
Claim 7
Dependent Claim
100 words
An image forming apparatus as defined in claim 1 wherein: the toner image forming means includes: optical image reading means for reading an optical image from the document in a main scanning direction while rendering a relative movement in a sub-scanning direction with respect to the document; an optical system having a variable magnification for introducing the optical image to the optical image reading means; the correcting means includes: operable means for changing the magnification of the optical system and the relative movement speed in the sub-scanning direction of the optical image reading means to attain the operative copying magnification.
Claim 8
Dependent Claim
87 words
An image forming apparatus as defined in claim 1 wherein: the toner image forming means includes: optical image reading means for reading an optical image from the document in a main scanning direction while rendering a relative movement in a sub-scanning direction with respect to the document to produce electrical image data; image processor means for processing the electrical image data; the correcting means includes: image processor control means for controlling the image processor means to correct the electrical image data to attain the operative copying magnification.
Claim 9
Dependent Claim
33 words
An image forming apparatus as defined in claim 7 wherein the correcting means further includes operable means for changing the relative movement speed in the sub-scanning direction of the optical image reading means.
Claim 10
Dependent Claim
58 words
An image forming apparatus as defined in claim 1 wherein: the toner image forming means includes: a photosensitive member; an optical system having a variable magnification for introducing an optical image from the document to the photosensitive member; the correcting means includes: operable means for changing the magnification of the optical system to attain the operative copying magnification.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-03-13 | 1998-09-12 | 1999-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-03-13 | 2002-09-12 | 2003-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-03-13 | 2006-09-12 | 2007-03-14 | $7700.00 | Window Closed / Lapsed |