Draw the block diagram and explain the working of photocopier.

Draw the block diagram and explain the working of photocopier.
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Answer :

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Working:- (i)A photocopy machine is an aluminium drum whose surface is coated with light sensitive material such as selenium. (ii)A positive electric charge is given to drum by rotating it adjacent to fine wire (corona )which is spaced closely to the drum surface and connected to high voltage of 6kV to 7kV. (iii)Due to high applied voltage air around corona is ionized which produces a positive electric charge and transferred to drum. (iii)In this situation if drum is exposed to light, it becomes a good conductor to transfer positive charge to aluminium base of drum. (iv)Once drum is positively charged, the page is scanned by optical lens and mirror and focus light reflected on drum where information is distributed. (v)A toner which is powdered dry ink is applied to drum .Negative charge is given to toner. Due to force of attraction, the negative toner is picked up by positively charged portions of drum surface. Thus image to be copied is present on drum surface. (vi)A positive charge is given to plain white paper in copier mechanism and then passes through heated rollers. (vii)The toner ink melts due to heat and print the image on the paper. (viii)Thus a very high quality copy of the original is produced by the photocopier machine.

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