to the outer surface of the upper lip 9 the scraping body 14 is preferably shaped to have an inclined edge 13 and a stop edge 15 separated by a surface 11 which conforms to a portion of the outer surface of the upper lip 9 the scraping body 14 is attached to a spring 16 by a rocker 18 which allows limited three dimensional movement of the scraping body 14 relative to the spring 16 this freedom to move allows the scraping body 14 to rock and pivot so that it conforms precisely to the upper lip 9 even if the angle or height of the upper lip 9 changes over the length of the slice the spring 16 is generally u shaped with the scraping body 14 attached to one leg of the 34 u 34 and a foot 20 rigidly attached to the other leg the foot 20 is preferably made of a similar corrosion resistant low friction polymer as the scraping body 14 the foot 20 is supported by and presses against the lower lip 12 in its operable position in fig1 typically the outer surface of the upper sharp edged plate 10 is made up of a series of interconnected planes or segments when looking at its cross section as illustrated in fig1 the upper sharp edged plate 10 has two parallel side planes and a lower plane which forms an obtuse angle with the left side plane and an acute angle with the right side plane the right side plane extends lower than the left side plane therefore the three segments which comprise the 34 outer surface 34.