Upon the main frame are the slideways t, t′, upon which the cross-head or cutter head frame z is carried, the elevating screw s raising or lowering the frame z, to suit the thickness of the work. The cutter head c, whose driving pulleys are shown at p, p, is carried in frame z, which also carries the pressure roll in front of the cutter (the bearing for this roll being shown at r), and a similar roll behind the cutter. To the frame z are pivoted the pressure bars b, b′, weighted with weights w. These bars rest on the cross-heads y, whose pins p act on the bearing boxes of the pressure rolls.
Fig. 3188.
The cutter head frame may be raised or lowered, for varying thicknesses of work, either by hand or by power. The hand movement is obtained from the hand wheel w, [Fig. 3188], which operates bevel gears b′′ and b′, the latter being threaded to receive the elevating screw.
The power or belt motion for raising or lowering the cutter head frame is obtained from rope wheel w′, which receives motion from the guide pulleys shown in [Fig. 3187]. The wheel w′ drives its shaft by the friction cone of its bore, which is forced against the corresponding cone on the shaft by the hand nut l. The handle v, [Fig. 3187], is for operating the upper guide pulley q, which acts as a belt-tightening pulley as well as a guide pulley, and the hand wheel t holds v in its adjusted position. When v is pushed downwards the rope (e) is loosened upon the pulleys, and both rope and pulleys remain idle.
The pulley that drives rope e is shown in [Fig. 3189] at r.
Fig. 3189.