Abstract: A knife holder apparatus for a cut pile tufting machine including a plurality of knife blocks, each knife block being fixed to a depending staff having an upright elongated channel, and a transverse knife bar having forwardly projecting, transversely spaced angular rib members for receiving the channels of the corresponding staffs. A transverse clamp pin bridging the channel of each staff is adapted to be received in a transverse clamping slot formed at a rearward inclination in each rib member and to be forced upward against the rearwardly inclined upper wall of the transverse slot by a set screw projecting upwardly into the slot for clamping the knife block in a predetermined position upon the knife bar to hold the knives in their tensioned positions against their corresponding looper hooks.

Abstract: A knife holder apparatus for a cut pile tufting machine including a knife block fixed to a depending mast which is slidably mounted within a corresponding slot in the knife bar and a wedge clamp member adapted to clamp or lock the knife bar carrying a plurality of knives in an operative position relative to the knife bar in which the knives cooperatively engage their corresponding looper hooks. The knife holder apparatus supports the knives at their predetermined tension and pitch angles relative to the looper hooks and in a manner in which the knife holder module and knives may be easily and quickly removed and replaced.