| 摘要 |
Apparatus for measuring the thickness of V-shaped stacks of paper sheets which are transported at equal intervals along the upper stretch of an endless chain has two scanning wheels one of which is located below and the other of which is located above the path for the stacks. The upper scanning wheel is lifted by successive stacks so that its position during engagement with a stack is indicative of the thickness of the thus engaged stack. The upper scanning wheel controls the position of a plate which can be received between two blades of a lever. The lever is pivotable by a cam which is driven in synchronism with the chain so that it allows the lever to assume a predetermined angular position when the scanning wheels engage a stack and when the thus engaged stack is of satisfactory thickness. Otherwise, the plate extends into the path of movement of one of the blades and prevents the lever from assuming its predetermined position. When the lever is free to assume its predetermined position, it actuates a switch or another suitable control device serving to regulate the operation of a processing machine for satisfactory stacks which have advanced beyond the scanning wheels. At least one of the scanning wheels, a balance beam for the plate and/or at least one of the blades on the lever is adjustable to allow for changes in setup of the measuring apparatus and/or to select the range of satisfactory thicknesses of tested stacks. |
