| 主权项 |
1. An apparatus, comprising:
a housing including a belt ingress and a belt egress and a drive apparatus in operative alignment with the belt ingress and the belt egress; a pivot arm having first and second ends defining a longitudinal axis, the first end pivotally connected to the housing by a pivot connection and operable to pivot about a pivot axis of the pivot connection; a drive follower in a tensioned slidable engagement with the second end the pivot arm so that the drive follower is in slidable disposition along the longitudinal axis of the pivot arm, the tensioned slidable engagement having an outward bias that causes the drive follower to dispose outwardly from the second end of the pivot arm; an endless round belting in driving engagement with the driver follower and the drive apparatus through the belt ingress and the belt egress, the endless round belting having a round cross section of a first diameter and having a lengthwise circumference that causes the endless round belting to apply an opposite tension to the drive follower that acts against the outward bias of the tensioned slidable engagement of the drive follower; a first scraper connected to the housing and having an engagement surface offset from the pivot axis and the belt ingress, the offset such that the engagement surface engages the endless round belting and directs the endless round belting into the belt ingress for substantially an entire operable pivot range of the pivot arm about the pivot axis; and a second scraper forming a substantially circular interior aperture having an adjustable second diameter and including a tensioned adjuster that adjusts the adjustable second diameter, wherein the endless round belting penetrates interior aperture, and the adjustable second diameter is adjustable to a diameter that is tensioned matched to first diameter of the endless round belting and during actuation of the drive apparatus the tensioned adjuster allows for the adjustable second diameter to adjust to match variations of the first diameter of the endless round belting. |
