GB686087A - Improvements in and relating to planing machines - Google Patents

Abstract

686,087. Planing. WALDRICH, O. May 17, 1951 [May 17, 1950], No. 11586/51. Class 83 (iii). A planing machine cutting on the forward and return strokes has a pair of semi-circular tool-carrying rams 9, 10 which are moved alternately to and from the work and at the same time rotated through about 180 degrees so that the tool or tools 50 on one ram are interchanged into the same working position as that previously occupied by the tool or tools on the other ram, but facing in the opposite direction, the rams being clamped in the tool head during each working stroke. The rams are mounted in a casing 7 pivoted on the tool head 6 and are rotated by a toothed wheel 11, the angle of rotation being normally limited to 180 degrees by the sloping faces of one or other of two abutments 17 engaging the sloping ends of a groove in the wheel hub, but, by adjusting the abutments back slightly, this angle can be increased so that a series of tools mounted behind one another in each ram can make staggered cuts. Rollers 30 carried by the ram are engaged in a cam groove 28 in a sleeve 26 on the end of a spindle 22, in order to give the movement to and from the work, and the spindle is adjustable by a motor 24 and gearing 25 driving a nut engaging the spindle in order to set the cutting depth. To ensure accuracy of this adjustment, stop members 58 may be fitted at the top of each ram and the spindle 22 may be resiliently connected to the sleeve 26 by a flange 60 and bolts with disc springs under their heads so that, before the lowest point of the cam groove is reached, the stop member 58 on the lower ram engages a collar 56 resting on a shoulder of the spindle and the final movement of the rams causes the sleeve 26 to yield upwards and hold the stop member and the collar abutting under the pressure of the springs. The rams are clamped by split tapered sleeves 38 which are pressed inwards by disc springs under the heads of bolts securing rings 38 to the casing 7 and are released by hydraulic rams forcing the sleeves outwards. For clamping other parts of the machine, for example, the tool head to the beam, similar bolts and disc springs may be employed and hydraulic pressure may be applied to the heads of the bolts to release the clamping. The hydraulic pressure may be controlled by the movement of the rams or of the machine table. A screwed spindle 31 inside the spindle 22 is provided for adjusting a sleeve 32 to withdraw a key 34 upwards so that the sleeve 26 is disengaged from the spindle 22 and can be rotated with the rams through 180 degrees, thus changing over the rams for feeding from left to right instead of right to left. Balls projecting from bores in the sides of each abutment 17 deflect a lever 52 and operate an electric contact 54 so that the motor driving the machine table can operate only when the wheel 11 has engaged the abutments. Motors 45 and 46 move the tool head slowly and rapidly, respectively, a motor 47 operates the hydraulic clamp-releasing means and motors 48 and 49 move the abutments 17.