Apron Mechanism
Lead screw and feed rod is
getting power from spindle gear through tumbler gears. Power is transmitted
from feed rod to the worm wheel through gears A, B, C, D and worm. A spline
shaft is attached with worm wheel.
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| APRON IN LATHE MACHINE |
The spline shaft is always
engaged with the gears F and G which are keyed to the feed check shaft. A knob
‘E’ is fitted with feed check shaft. Feed check knob ‘E’ can be placed in three
positions such as neutral, push-in and pull-out. When the feed check knob ‘E’
is in neutral position, power is not transmitted either to cross feed screw or
to the carriage since gears F and G have no connection with H and K.
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| APRON MECHANISM |
Therefore, hand feed is given as
follows. When the longitudinal feed hand wheel rotates, pinion I will also be
rotated through I and H. pinion I will move on rack for taking longitudinal
feed. For getting cross feed, cross slide screw will be rotated by using cross
slide hand wheel. When the feed check knob ‘E’ is push-in, rotating gear G will
be engaged to H then the power will be transmitted to pinion I and pinion I
will rotate on rack. So, automatic longitudinal feed takes place.
When the feed check knob ‘E’ is
pulled-out, the rotating gear F will be engaged to K. Hence, the power will be
transmitted to cross feed screws through L. This leads to automatic cross feed.
For thread cutting, half nut is engaged by half nut lever after putting knob
‘E’ neutral position. Half nut is firmly attached with the carriage. As the
lead screw rotates, the carriage will automatically move along the axis of the
lathe. Both longitudinal and cross feed can be reversed by operating the
tumbler gear mechanism.
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