To enable the packing of a crusher to be securely mounted on a bottle bed and the cutting performance from lowering by forming a spiral rib tilting in a direction the same as that of a screw part of the bottle bed onto a face facing the packing outer periphery side of a groove.

When part of a packing 12 is not engaged with a rib 14 by insufficient pushing, etc., part of the packing 12 is disengaged when the bottle bed is turned over. Since the inclination of the rib 14 of a groove 11 is formed almost the same as the inclination of a female screw 9 of the bottle bed 5, the packing 12 is rotated together with the vessel 15 to be completely set in the groove 11 as the bottle bed 5 and the vessel 16 are screwed together and the rib 14 is engaged with the whole circumference of the packing 12 to securely hold the packing. In the condition the packing 12 is set in the groove 11, since no gap exists in between the inner circumference of the packing 12 and the groove 11, no cut material cannot comes in to prevent rough cutting. Thus the cutting performance is prevented from lowering.