Incomplete stepping down the pedal switch to make lower needle knife move upwards,which facilitate the upper knife get together

Incomplete stepping down the pedal switch to make lower needle knife move upwards,which facilitate the upper knife get together with the  inner edge of leather needed to be pruned.

Regular nut can be meer different thickness of material to be processed.

Step pedal switch ,can remove the dust on the surface of needle knives.

Fit with knofe grindingstone for upper needle knife sharpening.

Sharpen the lower needle knife by rotating the nut.

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INNER HOLE TRIMMING MACHINE