The Collaborative International Dictionary of English v.0.48:

Spuller \Spul"ler\ (sp[u^]l"l[~e]r), n. [For spooler.] [See
   Spool.]
   One employed to inspect yarn, to see that it is well spun,
   and fit for the loom. [Prov. Eng.]
   [1913 Webster]