Surfaces of mean curvature one in hyperbolic space
Surfaces of mean curvature one in hyperbolic space
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发表时间：
1987
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通讯作者：
R. Bryant
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作者：
R. Bryant
在驱动辊和导向辊之间的环形带，例如宽橡胶带，其具有抵靠容纳气态显影介质的槽的穿孔壁的刮板，并用于在槽的穿孔壁上输送打印片材，通过将带导向辊通过与其轴承支撑件刚性连接的刚性构件安装在相对倾斜的导轨上，例如滚珠轨道，每个滚珠轨道保持一个或两个轴承滚珠，所述滚珠轨道由引导辊的相对端处的结构刚性地支撑。导轨支承着辊安装件的一部分，以便在有限的路径上滑动，这些路径是倾斜的，使得它们的线性投影相交于一个点，该点位于连接两个辊的轴线的中点的线上或附近，该点远离引导辊的轴线。安装构件在带路径的相对侧处具有凸缘，每个凸缘可由带的边缘接合，以在带侧向行进太远时校正引导辊的位移。作为支撑导轨的结构提供的刚性臂可以绕驱动辊的轴线摆动，以使带和引导辊组件远离工作位置运动，并且可以调节刚性臂的长度以提供所需的带张力。
An endless belt trained between a driving roller and a guiding roller, such e.g. as a wide rubber belt having a flight thereof bearing against and serving to transport photoprinting sheets over a perforated wall of a tank holding a gaseous developing medium, is maintained in alignment by mounting the belt guiding roller, through rigid members rigidly connected with its bearing supports, on oppositely inclined guide tracks, such as ball tracks each holding one or two bearing balls, which are rigidly supported by structures at the opposite ends of the guiding roller. The guide tracks support parts of the roller mounting members for sliding movement in limited paths so inclined that their linear projections intersect at a point located away from the axis of the guiding roller on or near to a line connecting the mid-points of the axes of the two rollers. The mounting members present flanges at opposite sides of the belt path, each engageable by an edge of the belt for corrective displacement of the guiding roller if the belt travels too far sidewise. Rigid arms provided as the structures supporting the guide tracks can be swung about the axis of the driving roller for movement of the belt and guiding roller assembly away from working position, and can be adjusted in length to provide the required belt tension.