التفاصيل البيبلوغرافية
| العنوان: |
IMAGE FORMING APPARATUS AND METHOD OF CONTROLLING THE SAME |
| Document Number: |
20110091256 |
| تاريخ النشر: |
April 21, 2011 |
| Appl. No: |
12/905250 |
| Application Filed: |
October 15, 2010 |
| مستخلص: |
An image forming apparatus includes a first rotator by which one surface of a paper is subjected to image transferring, image fixing, or other processings, a second rotator which presses the paper against the first rotator from the other surface of the paper, a space changing unit which changes a space between axial cores of the first rotator and the second rotator, a feeding unit which feeds the paper between the first rotator and the second rotator, and a control unit which adjusts a driving timing of the space changing unit in accordance with the driving of the feeding unit, wherein when the paper is thinner than a set value, the control unit makes the paper enter between both the rotators in a state where the second rotator is pressed against the first rotator, and when the paper is equal to or thicker than the set value, the control unit controls to press the second rotator against the first rotator at a timing where a distal end of the paper passes through between both the rotators. |
| Inventors: |
NOZAWA, Shigeki (Toyokawa-shi, JP); Nakazawa, Yoshiki (Toyokawa-shi, JP); Ito, Masazumi (Toyohashi-shi, JP); Anazawa, Masahiro (Toyohashi-shi, JP) |
| Assignees: |
Konica Minolta Business Technologies, Inc. (Chiyoda-ku, JP) |
| Claim: |
1. An image forming apparatus comprising: a first rotator by which one surface of a paper is subjected to image transferring, image fixing, or other processings; a second rotator which presses the paper against the first rotator from the other surface of the paper; a space changing unit which changes a space between axial cores of the first rotator and the second rotator; a feeding unit which feeds the paper between the first rotator and the second rotator; and a control unit which adjusts a driving timing of the space changing unit in accordance with the driving of the feeding unit, wherein when the paper is thinner than a set value, the control unit makes the paper enter between both the rotators in a state where the second rotator is pressed against the first rotator, and when the paper is equal to or thicker than the set value, the control unit controls to press the second rotator against the first rotator at a timing where a distal end of the paper passes through between both the rotators. |
| Claim: |
2. The image forming apparatus according to claim 1, wherein an outer circumferential layer of at least one of the first rotator and the second rotator is formed with an elastic material. |
| Claim: |
3. The image forming apparatus according to claim 1, wherein when the paper is thinner than a set value, the paper is controlled to enter between both the rotators in a state where the second rotator is pressed against the first rotator, when the paper is equal to or thicker than the set value, a space between both the rotators is controlled to be large such that the paper is not pressingly nipped until a distal end of the paper enters between both the rotators and the space between both the rotators is controlled to be narrower such that the paper is pressingly nipped after the distal end of the paper has passed through between both the rotators. |
| Claim: |
4. The image forming apparatus according to claim 3, wherein when the paper is equal to or thicker than the set value and there is not a space having a predetermined size or larger between a distal end of the paper in the paper transportation direction and an image area and there is a space having the predetermined size or larger between a rear end of the paper and the image area, a space having the predetermined size or larger is controlled to be provided between the distal end of the paper and the image area by making the image area deviate to the rear side and forming an image. |
| Claim: |
5. The image forming apparatus according to claim 3, wherein when the paper is equal to or thicker than the set value and there is not a space having the predetermined size or larger between a distal end of the paper in the paper transportation direction and an image area and there is a space having the predetermined size or larger between a rear end of the paper and the image area, an image is controlled to be formed on the paper while the front and the rear sides of the image are inverted. |
| Claim: |
6. The image forming apparatus according to claim 3, wherein when the paper is equal to or thicker than the set value and there is not a space having the predetermined size or larger between a distal end of the paper in the paper transportation direction and an image area and between a rear end of the paper and the image area, a space having the predetermined size or larger is provided between the distal end of the paper and the image area by contracting and forming an image. |
| Claim: |
7. The image forming apparatus according to claim 1, wherein the first rotator is a secondary transfer roller for transferring an image onto a paper. |
| Claim: |
8. The image forming apparatus according to claim 1, wherein the first rotator is a fixing roller for fixing an image onto a paper. |
| Claim: |
9. An image forming apparatus comprising: an intermediate transfer belt which bears a toner image on an outer circumferential surface; a transfer roller at least of which outer circumferential layer is formed with an elastic material, and which is arranged so as to be opposed to the intermediate transfer belt and rotates in synchronization with the intermediate transfer belt; a space changing unit which switches states between an advanced state where the transfer roller is in pressure contact with the intermediate transfer belt and a retreated state where the transfer roller is spaced from the intermediate transfer belt; a feeding unit which feeds a paper between the intermediate transfer belt and the transfer belt; a thickness judgment unit which judges thickness of the paper; and a control unit which changes a timing where the transfer roller is switched from the retreated state to the advanced state by the space changing unit based on the thickness judgment unit, wherein the control unit makes the timing where the transfer roller is made into pressure contact with the intermediate transfer belt delay when the paper is equal to or thicker than a set value in comparison with that when the paper is thinner than the set value. |
| Claim: |
10. The image forming apparatus according to claim 9, wherein when the paper is thinner than the set value, the paper is controlled to enter between the intermediate transfer belt and the transfer roller in a state where the transfer roller is in pressure contact with the intermediate transfer belt and when the paper is equal to or thicker than the set value, the paper is controlled to enter between the intermediate transfer belt and the transfer roller before the transfer roller is made into pressure contact with the intermediate transfer belt. |
| Claim: |
11. The image forming apparatus according to claim 9, wherein when the paper is equal to or thicker than the set value, the control unit controls to drive the space changing unit at a timing where a distal end of the paper is pressingly nipped. |
| Claim: |
12. An image forming method used in an image forming apparatus that comprises a first rotator by which one surface of a paper is subjected to image transferring, image fixing, or other processings, a second rotator which presses the paper against the first rotator from the other surface of the paper, a space changing unit which changes a space between axial cores of the first rotator and the second rotator and a feeding unit which feeds the paper between the first rotator and the second rotator, the method comprising: step of judging the paper is thinner than a set value or not; step of making the paper enter between both the rotators in a state where the second rotator is pressed against the first rotator when the paper is thinner than the set value; and step of making the second rotator press against the first rotator at a timing where a distal end of the paper passes through between both the rotators when the paper is equal to or thicker than the set value. |
| Current U.S. Class: |
399/388 |
| Current International Class: |
03 |
| رقم الانضمام: |
edspap.20110091256 |
| قاعدة البيانات: |
USPTO Patent Applications |