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MECHANICAL AND ELECTRICAL PRINCIPLES
17
to the drive shaft by means of a V belt and pulleys.
Variations in machine speed are obtained by adjusting
the variable speed pulley on the drive motor. The
motor mounting is adjustable vertically and can be
pivoted in an arc for the purpose of regulating belt
tension and alignment. The complete motor and
mounting assembly is easily removed for repair or
renewal.
The drive shaft extends over the length of the
machine approximately on a level with the card line
(Figure 13). Worms cut at intervals on the shaft
are used for the purpose of gearing to the feed roll
shafts, which run at right angles to the drive shaft.
Except for the first 3 sets of feed rolls, only the lower
feed rolls are gear driven; the upper rolls are friction
driven from the lower rolls. Located at the right end
of the drive shaft (rear view) is a thrust bearing which
aids in absorbing the thrust developed in the shaft.
This bearing must be kept well lubricated.
Declutching Hand Wheel (Figure 14)
Mounted on the left end (rear view) of the drive
shaft is a hand wheel which is used to turn the drive
shaft over manually when checking machine adjust-
ments and timing. The hand wheel is normally dis-
engaged from the drive shaft as it is cammed to the
left (rear view) by the pin in the shaft striking the
ratchet teeth on the handwheel as the shaft revolves.
In this manner, the handwheel does not turn when
the machine is in operation, thus eliminating a possible
safety hazard. To revolve the shaft by hand, it is
necessary to push the handwheel farther onto the
shaft while turning it clockwise, causing the ratchet
teeth to engage the pin.
A housing over the end of the horizontal shaft is
held in place by four screws. The handwheel is re-
tained in this housing by a ring type expansion spring
around its shank. This spring expands into a shallow
channel inside the housing when the shank of the
hand wheel is inserted in it. A beveled edge on the
housing aids in compressing the spring to facilitate
inserting the shank of the handwheel. If it is desired
to remove the hand wheel, a sharp rap to the left
(rear view) with a mallet or hammer handle will
cause compression of the retaining spring and allow
it to slip through the smaller opening at the end of
the housing. Figure 14 shows the housing removed
and the handwheel inserted over the end of the shaft.
Figure 14. Declutching Hand Wheel
Reverse Lock (Figure 15)
Machines may be equipped with a reverse lock on
the pulley end of the drive shaft which prevents the
possibility of turning the drive shaft backwards and caus-
ing damage to the commutator and card brushes. This
Figure 15. Reverse Lock
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