Adjustable transfer belt unit in an image-forming machine
AssigneeMita Industrial Co., Ltd.
InventorsTakeshi Marumoto, Tsuyoshi Koyanagi, Kazuya Kamidaira
Life of this patent
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Abstract
A transfer belt unit in an image-forming machine comprising a transfer roller which is disposed being opposed to an image carrier with a transfer belt interposed therebetween and is rotatably supported at both ends by a support member, and a moving means which moves said transfer roller toward said image carrier up to a first position where said transfer belt is pushed onto said image carrier, and moves said transfer roller in a direction opposite to said image carrier up to a second position where said transfer belt is separated away from said image carrier.
Claims12
A transfer belt unit in an image-forming machine which comprises a drive roller, a driven roller disposed in parallel with, and spaced from, said drive roller, a transfer belt wrapped round said drive roller and said driven roller, and a cleaning blade disposed, at least when in a cleaning state, in contact with the surface of said transfer belt, and which transfers the toner image formed on an image carrier onto a copying paper that is fed to between said transfer belt and said image carrier and conveys the transfer paper onto which the toner image has been transferred, wherein said transfer belt unit further comprises:
- a transfer roller which is opposed to said image carrier with said transfer belt interposed therebetween and is rotatably supported at its both ends by a support member;
- and
- a moving means which moves said transfer roller toward said image carrier up to a first position wherein said transfer belt is pushed onto said image carrier member, the transfer belt has tension and the cleaning blade contacts the transfer belt with a pressure suited for cleaning, and said moving means moves said transfer roller in a direction opposite to said image carrier to a second position wherein said transfer belt is separated away from said image carrier, the tension in the transfer belt is loosened and the pressure between the cleaning blade and the transfer belt is removed.
A transfer belt unit in an image-forming machine which comprises a drive roller, a driven roller disposed in parallel with, and spaced from, said drive roller, and a transfer belt wrapped round said drive roller and said driven roller, and which transfers the toner image formed on an image carrier onto a copying paper that is fed to between said transfer belt and said image carrier and conveys the transfer paper onto which the toner image has been transferred, wherein the transfer belt unit further comprises:
- a transfer roller unit having a roller support member that is disposed being opposed to said image carrier with said transfer belt interposed therebetween, and a transfer roller made up of two rollers that are supported by said roller support member on the same axis in a manner of being opposed to each other and being allowed to rotate and slide in the axial direction;
- a roller length-changing means which moves at least one of said rollers in the axial direction;
- and
- a control unit that drives to control said roller length-changing means to accord with the size of the transfer paper at the time of transfer operation.
A transfer belt unit in an image-forming machine which comprises a drive roller, a driven roller disposed in parallel with, and spaced from, said drive roller, a transfer belt wrapped round said drive roller and said driven roller, and a cleaning blade disposed in contact with the surface of said transfer belt, and which transfers the toner image formed on an image carrier onto a copying paper that is fed to between said transfer belt and said image carrier and conveys the transfer paper onto which the toner image has been transferred, wherein the transfer belt unit further comprises:
- a transfer roller unit having a roller support member that is disposed being opposed to said image carrier with said transfer belt interposed therebetween, and a transfer roller made up of two rollers that are supported by said roller support member on the same axis in a manner of being opposed to each other and being allowed to rotate and slide in the axial direction;
- a roller length-changing means which moves at least one of said rollers in the axial direction;
- a moving means which moves said transfer roller unit toward said image carrier up to a first position where said transfer belt is pushed onto said image carrier member, and moves said transfer roller unit in a direction opposite to said image carrier up to a second position where said transfer belt is separated away from said image carrier;
- and
- a control unit which, when the transfer operation is being carried out, drives to control said roller length-changing means to accord with the size of the transfer paper, drives said moving means so that said transfer roller unit is moved to said first position and, when the transfer operation is not being carried out, drives said moving means so that said transfer roller unit is moved to said second position.
A transfer belt unit in an image-forming machine which comprises a drive roller, a driven roller disposed in parallel with, and spaced from, said drive roller, a transfer belt wrapped round said drive roller and said driven roller, and a cleaning blade disposed in contact with the surface of said transfer belt, and which transfers the toner image formed on an image carrier onto a copying paper that is fed to between said transfer belt and said image carrier and conveys the transfer paper onto which the toner image has been transferred, wherein said transfer belt unit further comprises:
- a transfer roller which is opposed to said image carrier with-said transfer belt interposed therebetween and is rotatably supported at its both ends by a support member;
- and
- a moving means which moves said transfer roller toward said image carrier up to a first position where said transfer belt is pushed onto said image carrier member, and moves said transfer roller in a direction opposite to said image carrier up to a second position where said transfer belt is separated away from said image carrier, and wherein said transfer roller has a length in the axial direction thereof which is smaller than the width of said transfer belt.
A transfer belt unit in an image-forming machine which comprises a drive roller, a driven roller disposed in parallel with, and spaced from, said drive roller, a transfer belt wrapped round said drive roller and said driven roller, and a cleaning blade disposed in contact with the surface of said transfer belt, and which transfers the toner image formed on an image carrier onto a copying paper that is fed to between said transfer belt and said image carrier and conveys the transfer paper onto which the toner image has been transferred, wherein said transfer belt unit further comprises:
- a transfer roller which is opposed to said image carrier with said transfer belt interposed therebetween and is rotatably supported at its both ends by a support member;
- and
- a moving means which moves said transfer roller toward said image carrier up to a first position where said transfer belt is pushed onto said image carrier member, and moves said transfer roller in a direction opposite to said image carrier up to a second position where said transfer belt is separated away from said image carrier, and wherein said transfer roller is chamfered at its both end portions.
Dependencies are inferred from the claim text.