Quick–re-turn′ Gear′ing.
（Planing-machine.) Gear for causing the rapid return of the bed after the tool has completed each cut. This is effected (see upper figure) by the pulley a [1848] and pinion a′. The bed is moved from left to right, presenting the work to the cutting edge of the tool by the rack b, operated from the pulley c through the gears c1 c2 c3 c4. On arriving at the end of its motion, a stud on the lathebed strikes a horn, which shifts the driving-belt from c to a, causing the pinion a′ to reverse the movement of the gear c4, and turn the bed in the opposite direction, until the belt is shifted back to its original pulley by a similar device at the other end of the machine.
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| Quick-return gearing. |
