The Collaborative International Dictionary of English v.0.48:

Scribbling \Scrib"bling\, n. [See 1st Scribble.]
   The act or process of carding coarsely.
   [1913 Webster]

   Scribbling machine, the machine used for the first carding
      of wool or other fiber; -- called also scribbler.
      [1913 Webster]