Graphic Design & Printing TechnologyNut and bolt:- A nut is a type of fastener with a threaded hole. Nuts are almost
always used opposite a mating bolt to fasten a stack of parts together. A bolt is
a form of threaded fastener with an external male thread.
Pulleys:- This is used to transmit drive from one to another. There are different
types according to the shape of belts on it such as flat, grooved, teethed,etc.
The diameter, width and number of grooves in a pulley depend on the load it
has to transmit.
Bearings :- Bearings are supporting elements for shaft, cylinders, etc. They
need intermittent oil lubrication at desired quanity. There are different types
of bearings such as brush bearing, ball bearing, roller bearing, and needle
bearing.
Hydraulics and Pneumatics
Hydraulics deals with the mechanical properties of liquids or fluids. Hydraulics
is used for the generation, control and transmission of power by the use of
pressurised liquids. A hydraulic drive system consists of three parts, the
generator (hydraulic pump), driven by an electric motor, a combustion engine;
valves, filters, piping etc. (to guide and control the system); and the actuator
(hydraulic motor or hydraulic cylinder) to drive the machinery.
Pneumatics is a branch of engineering that makes use of gas or pressurised air.
Pneumatic systems are commonly powered by compressed air or compressed
inert gases. Their principle of operation is similar to that of the hydraulic
power systems. With pneumatics, air is usually pumped into a receiver using
a compressor. Energy produced by pneumatic systems are more flexible, less
costly, more reliable, and less dangerous than some electric motors.
Mechanical, Electrical, Electronic and Pneumatic parts
of a printing machine
Mechanical parts of an offset machine are :
Gears, cams and followers, chain and sprockets, side frames, plate, blanket
and impression cylinders, pulleys, shafts, lever, bearings, nuts and bolts,
washers, etc.
Electrical parts of an offset machine are :
Motors (AC & DC), transformers (step up & step down), electro magnets,
relays, switches, etc.