Patent ID: 7753299
Filing Date: 2010-07-13
Classification: A22C,A23K,B02C

Abstract:
1. An apparatus including: (a) a drive structure supported for rotation about a drive axis; (b) a first blade carrier having a first blade facing a cutting surface of a first screen portion, the first blade carrier being moveably mounted on the drive structure along a first positioning axis to vary the position of the first blade with respect to the cutting surface of the first screen portion, the first blade carrier also being mounted in the apparatus so as to sweep the first blade across the first screen portion cutting surface when the drive structure rotates about the drive axis; (c) a first pressure transfer chamber defined between the drive structure and a pressure transfer surface of the first blade carrier; (d) a first pressure communication structure providing pressure communication to the first pressure transfer chamber, the first pressure communication structure including a first passageway extending longitudinally along a portion of the drive structure; (e) a second blade carrier having a second blade facing a cutting surface of a second screen portion, the second blade carrier being moveably mounted on the drive structure along a second positioning axis to vary the position of the second blade with respect to the cutting surface of the second screen portion, the second blade carrier also being mounted in the apparatus so as to sweep the second blade across the second screen portion cutting surface when the drive structure rotates about the drive axis; (f) a second pressure transfer chamber defined between the drive structure and a pressure transfer surface of the second blade carrier; and (g) a second pressure communication structure providing pressure communication to the second pressure transfer chamber, the second pressure communication structure including a second passageway extending longitudinally along a portion of the drive structure.