The invention relates to a chipper (1) bed knife (2) attached detachably tothe chipper frame (3), the chipper (1) having a chipper disc (5) supported onits shaft (4), which shaft is fitted rotatably to the chipper frame (3), thechipper disc (5) comprising a number of knives (6) arranged to pass the knifeedge (7) of the bed knife (2) at a distance corresponding to the requiredknife clearance (v), when the chipper disc (5) is rotating. The bed knife (2)also has a second knife edge (7'), the said knife edges (7, 7') being arrangedat a distance from each other in the direction of movement (A) of the chipperdisc (5) knives (6). A groove (8) is formed in the bed knife (2) between thesaid knife edges (7, 7').
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