Fig. 3124.
[Fig. 3124] represents a scroll saw constructed by H. L. Beach. This machine is provided with a tilting table, which can be set at any angle up to 39 degrees, either to the right or left, the exact angle being indicated by a graduated arc.
The straining device, including the springs, air pump, guide-ways, cross-head and steel bearing, are all attached to the vertical tubular shaft, which is secured to the heavy cast back support by the box e and eccentric lever f. By raising the lever f, the shaft, being balanced, is free to move up or down to suit any length of saw.
At the same time, the steel bearing l forms a support for the back and sides of the saw, and can be raised or lowered to suit any thickness of work.
The under guide-ways are so constructed that their expansion by tightening does not tighten the cross-head. Instead of the ordinary tight and loose pulleys, the crank shaft carries a friction pulley and combination brake by which the saw is stopped or started instantly, by a single motion of the foot.
This leaves the hands entirely free, and saves considerable time in stopping and starting.
The lower end of the saw is held by a steel clamp; when the saw breaks it can be used again by filing a notch. Both ends of the saw are arranged to take up lost motion and wear.
Any desired strain from 10 to 75 pounds can be given to the saw, and the strain is equal at all points of the stroke.