Doffer – worked in the spinning mills, replacing the full yarn bobbins with empties on the looms
http://rmhh.co.uk/occup/d.htmland then if you click on the link you find this.
The cotton (or wool) 'Throstle' is the name of a machine for the continuous
Spinning of cotton (or wool) simultaneously onto long rows of, perhaps 300 or 400, Pirns or Bobbins.
A mill work-room would have many of these machines which the teams of Doffers would attend to. (The actual piecing of the thread during the process was done by another operative, known as a Piecer.)
Later improvements were made and a multi-thread spinning machine, known as
the 'Self Acting Mule' was invented by Samuel Crompton of Bolton in 1779.
The word 'Minder' refers to the operative in charge of the machine.
He ( and it would usually be a 'He' because of the physical nature of the
job!) would also have other assistants known as 'Piecers' whose work would
be to repair the threads as and when they broke during the spinning process.
He also had the help of teams of 'Doffers' when the 'Pirns' or 'Bobbins' became
filled on his 'Mule'.
A Weaver is the name of the operative of a loom which actually made cloth.
Interesting Snippet:-
Liverpool Journal 27th Jan 1849
DEATH OF THE FIRST POWER LOOM WEAVER
On tues last Mr Andrew KINLOCH, aged 89 died at the house of his son in Preston. In 1793 he set up the first power loom in Glasgow, with which the propelling power was his own hand, he managed after an outlay of 100 guineas to produce 90 yards of cloth. This sum, we may explain was jointly subscribed for the experiment by four members of Glasgow Chamber of Commerce. Shortly afterwards Andrew got the loom conveyed to Milton Print-field at Dumbuck where 40 looms on the same principle were erected under his special direction.. These machines can still be seen at POLLOCKSHAWS and PAISLEY. He left for England in 1800 setting up similar looms in different towns in Lancashire, the first at Stalybridge nr Manchester. Fifteen of these in a short time where moved to Westhoughton were they remained till 1812 when the hand loom weavers jealous of their interests being affected burned the factory to the ground along with 170 looms.