IMAGE FORMING APPARATUS
FIG1 is a schematic diagram illustrating a configuration of an image forming apparatus of a first embodiment
The intermediate transfer belt 21 is wrapped around a secondary transfer inner roller 22, a stretch roller 23, a tension roller 24 and the primary transfer rollers 25 and is driven to rotate in counterclockwise (see arrow R1) in FIG1. The image forming operations described above are executed in parallel in the respective image forming units PY through PK, and the four color toner images are superimposed so as to overlap with each other to form a full-color toner image on the intermediate transfer belt 21. This toner image is borne on the intermediate transfer belt 21 and is conveyed to a transfer portion, i.e., a secondary transfer portion, provided as a nip portion between the secondary transfer inner roller 22 and a secondary transfer roller 43. The secondary transfer roller 43 serving as a transfer member is applied with a bias voltage having an inverse polarity from the charging polarity of the toner to secondarily transfer the toner image borne on the intermediate transfer belt 21 onto the sheet P. Residual toner left on the intermediate transfer belt 21 after the transfer is removed by a belt cleaner 26.
schematic diagram
40
feed unit
76
duplex sensor
43
secondary transfer roller
31
sheet feed cassette
12
charging roller
10
image forming engine
70
reverse conveyance portion
24
tension roller
72
first duplex roller pair
80
discharge tray
73
second duplex roller pair
44
registration sensor
62
discharge roller pair
23
stretch roller
71
roller pair
100
apparatus body
79
path
50
fixing unit
26
belt cleaner
33
manual feed tray
60
['1. An image forming apparatus comprising: a first conveyance path (59); an image forming means (10) configured to form an image on a sheet passing through the first conveyance path (59); a first conveyance member (71) configured to receive the sheet from the first conveyance path (59) and convey the sheet to reverse the sheet; a second conveyance path (79) through which the sheet reversed by the first conveyance member (71) is guided to the first conveyance path (59); a first driving source (170) configured to drive the first conveyance member (71); and a controller (200) configured to control the first driving source (170) such that in a case where images are to be formed on a first surface of a preceding sheet, on a first surface of a succeeding sheet fed to the first conveyance path (59) succeeding to the preceding sheet and on a second surface of the preceding sheet, the controller (200) causes the first conveyance member (71) to stop without reversing the preceding sheet (2B in FIG. 10A) in a direction of heading to the second conveyance path (79) in a case where the image has been formed on the first surface of the preceding sheet and permission of preparing the image to be formed on the first surface of the succeeding sheet is not issued yet, and the controller (200) causes the first conveyance member (71) to restart conveyance of the preceding sheet (2B in FIG. 10C) to the second conveyance path (79) based on timing when the image forming means (10) starts preparing the image to be formed on the first surface of the succeeding sheet.']