Abstract A transfer device of an image forming machine has a belt unit (30) comprising a pair of supporting plates (35, 36) disposed with a predetermined spacing, a driving roller (43) journaled rotatably at one end portion of the pair of supporting plates, a driven roller (49) journaled rotatably at the other end portion of the pair of supporting plates (35, 36) with a predetermined spacing from the driving roller (43). A transfer roller (50) is disposed between the driving roller (43) and the driven roller (49), journaled rotatably on the pair of supporting plates (35, 36) and given a predetermined voltage. A transfer belt (57) is looped around the driving roller (43), the driven roller (49) and the transfer roller (50), and disposed opposite an image bearing member (3). The transfer belt (57) of the belt unit is formed so as to have a width larger than the spacing between the pair of supporting plates (35, 36) and is disposed such that its side end portions surround at least part of the pair of supporting plates.
A transfer device for use in an image forming machine comprising a belt unit (30) having a pair of supporting plates (35, 36, 39, 40) disposed with a predetermined spacing, a driving roller (43) journaled rotatably at one end portion of the pair of supporting plates (39, 40), a driven roller (49) journaled rotatably at the other end portion of the pair of supporting plates (35, 36; 39, 40) with a predetermined spacing from the driving roller (43), and a transfer belt (57) looped around the driving roller (43), and the driven roller (49) and disposed opposite an image bearing member (3), said transfer belt (57) adapted to transfer a toner image formed on the image bearing member to paper fed between the transfer belt (57) and the image bearing member (3) and convey the paper with the toner image transferred thereto; wherein the transfer belt (57) of the belt unit (30) is provided with a width larger than the spacing between the pair of supporting plates (35, 36; 39, 40), and is disposed such that its side end portions cover at least part of the pair of supporting plates.
Claim 2
Dependent Claim
77 words
The transfer device of Claim 1, wherein the belt unit (30) has a transfer roller (50) disposed between the driving roller (43) and the driven roller (49), journaled rotatably on the pair of supporting plates (35, 36), and placed under a predetermined voltage, wherein bearings (54) for journaling the transfer roller (50) are disposed in the pair of supporting plates (35, 36) at such positions as to be embedded in the inside surfaces thereof toward the outside.
Claim 3
Dependent Claim
30 words
The transfer device of Claim 1, wherein anti-snaking members (58) for restricting the sideways movement of the transfer belt (57) are mounted on the pair of supporting plates (39, 40).