Knee Position Recorder for Sawmill Carriage Headblocks

摘要

A research instrument is described that automatically records the exact amount the knees of sawmill carriage headblocks move in making rapid successive sets during the sawing operation. It was designed for use on the Forest Products Laboratory's conventional sawmill that is used for studies of sawtooth action and saw performance. It is believed to also have application where an automatic and positive record is required of a succession of irregular intermittent indexing actions. The instrument consists of a marking stylus mounted on the side of the sawmill carriage headblock and a battery-powered electric circuit that produces a mark on an electrosensitive tape. The tape is inserted in a holder affixed to the side of the headblock base. Microswitch assemblies activated by stationary cams positioned along the sawmill track serve to control momentary electric impulses that mark the electrosensitive paper. (Author)