Image forming apparatus

An image forming apparatus comprising:

• (a) a main body;
• and
• (b) a process cartridge detachably mounted on said main body, said process cartridge comprising;
• (i) a unit containing a belt-type photoreceptor on which a latent image can be formed, said photoreceptor being stretched around at least two rollers, each of said rollers having shafts at both ends, said unit further containing a support member for supporting said photoreceptor, said support member maintaining a constant distance between a plurality of developing devices and said photoreceptor, wherein said photoreceptor, said rollers, and said support member are integrally formed as said unit, and
• (ii) a housing comprising a casing for accommodating said plurality of developing devices, provided in series in a conveying direction of said photoreceptor, to develop said latent image, said housing further comprising a charger for charging said photoreceptor, a cleaner for cleaning residual toner from said photoreceptor, and a guide for guiding said shafts of said rollers to position said unit when said unit is mounted on said housing,
• said unit being detachably mounted on said housing in a substantially vertical direction, whereby a surface of said photoreceptor is positioned opposite said plurality of developing devices.