chaff-cutter, n.² — Green’s Dictionary of Slang

chaff-cutter n.²

[SE chaff-cutter, a machine that cuts chaff for fodder; i.e. the noise of the keys]

(Aus.) a typewriter.

1931		News (Adelaide) 27 Feb. 1/4: ‘Stop that chaff cutter a moment,’ said Mr. A. J. Radford in No. 4 Adelaide Police Court today. The clerk ceased using the typewriter while Mr. Radford addressed counsel.
1944		Western Mail (Perth) 31 Aug. 28/2: To make you quite au fait with the situation let me explain the "chaffcutter" referred to was no agricultural implement but my well used and much maligned typewriter.
1953		Advertiser (Adelaide) 21 Aug. 6/5: My 15-year-old type writer, famous for its chaff-cutter clatter which disturbs the peace in press boxes everywhere.