| 摘要 |
A grinding wheel is mounted on a machine base, and a pair of saw chain holders disposed on opposite sides of the grinding wheel are also mounted on the base. The holders are urged toward the grinding wheel by a spring and are moved away from the grinding wheel by pull cables operated by foot pedals. A turnscrew assembly is rotatably supported on the base and has right and left hand threads on opposite ends thereof on which are threadedly mounted stop fingers arranged such that by adjustment of one of the stop fingers for selectively locating its respective holder with relation to the grinding wheel, the other stop finger is simultaneously adjusted so that the other holder is positioned in precisely the same spaced position as the first mentioned holder but on the opposite side of the grinding wheel. A releasable solenoid operated hold-down lever for the saw chain is provided on each holder, and these levers are released when the foot pedals are depressed, such being accomplished by means of switches in the circuit to the solenoids and arranged for engagement by the foot pedals.
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