m - HKU Libraries
m - HKU Libraries
m - HKU Libraries
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4. Start up a ring frame after<br />
doffing.<br />
5. Creel a roving bobbin and make<br />
a good clean piecing.<br />
6. Answer questions satisfactorily<br />
on:<br />
(a)<br />
The purpose of ring spinning.<br />
(b) The dangerous parts and<br />
safety devices on a ring<br />
spinning frame.<br />
(c) The names of the main parts<br />
of a ring spinning frame.<br />
(d) The effects of imperfect<br />
cleaning work on quality and<br />
machinery.<br />
(g)<br />
(e) Why yarn doffing should be<br />
speedy and efficient.<br />
(/) The reason why only one<br />
turn of hand wrapping is<br />
allowed when starting ends<br />
on bare bobbins, also the<br />
reason why a second start<br />
without cleaning off is prohibited.<br />
Why members of a doffer<br />
team should co-operate.<br />
(/z) The reason for detecting and<br />
removing faulty bobbins and<br />
placing them in a certain<br />
place.<br />
(0 How to differentiate between<br />
ring yarns and rovings of<br />
different counts.<br />
89
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