| CPC G03G 15/1615 (2013.01) | 9 Claims |
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1. An image forming device comprising:
a first image carrier on which a monochrome toner image is formed;
a plurality of second image carriers, each provided for one of different colors, on which toner images are formed in the different colors;
a transfer belt that transfers the toner images, each formed on one of the first image carrier and the plurality of second image carriers;
a first presser that presses the transfer belt against the first image carrier and a plurality of second pressers that presses the transfer belt against each of the plurality of second image carriers to transfer the monochrome toner image and the toner images formed in the different colors onto the transfer belt; and
a switching mechanism that switches a position of each of the first presser and the plurality of second pressers according to a rotation angle of a cam, wherein
the switching mechanism switches each of the first presser and the plurality of the second pressers to stop at one of a first position that presses the transfer belt against each of the first image carrier and the plurality of second image carriers, a second position that separates from the first image carrier and the plurality of second image carriers, and a third position that is a position separating from the first image carrier and the plurality of second image carriers and having a smaller separation distance from each of the first image carrier and the plurality of second image carries than the second position,
the switching mechanism has:
the cam provided rotatably about a rotating shaft, and having a center and an outer periphery such that a distance from the center to the outer periphery varies according to a position of the outer periphery,
a link member that makes contact with the cam, the link member being movable along the transfer belt according to a rotation of the cam, and
a first swing member and a plurality of second swing members each of which is a member formed into a letter-L shape, the first swing member and the plurality of second swing members being rotatably supported by a frame that holds the transfer belt, the first swing member having an end provided with the first presser, and the plurality of second swing members each having an end provided with one of the plurality of second pressers,
when the cam rotates, the link member moves to rotate the end included in the first swing member and provided with the first presser and the end included in each of the plurality of the second swing members and provided with each of the plurality of second pressers, such that the position of each of the first presser and the plurality of second pressers changes, and
at the third position, a distance between each of the plurality of second pressers and a corresponding one of the plurality of second image carriers is equal to a distance between the first presser and the first image carrier.
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