831,685. Skiving-machines. FORTUNAWERKE SPEZIALMASCHINENFABRIK A.G. Oct. 4, 1956 [Feb. 17, 1956], No. 28303/55. Addition to 790,884. Class 31 (1). In a skiving-machine of the cylindrical type as set forth in the parent Specification in which the angle and depth of cut are controlled by adjustment of the angular and heightwise position of a guide foot, the position of the guide foot being determined by the operative one of a plurality of angle and height setting devices mounted in or on a continuously rotatable member so that adjustment of the position of the guide foot can be effected by rotation of the rotatable member to bring any one of the setting devices into operative location, means are provided whereby the rotatable member may be rotated through a succession of control positions (i.e. guide foot adjusting positions) in any desired sequence by operation of a single control member in the form of a foot-operated treadle. As described in the parent Specification, the angle and height setting devices are mounted in a drum 29, Fig. 5a, which is rotatable about a shaft 30 by means of a solenoid 51, a control head 53, gripping arms 58, 59, Fig. 7, engageable with driving pins 49, 50, 89 mounted on the drum, and a bifurcated member 67. The direction of rotation of the drum is reversible by means of a lever 77 controlled by a solenoid 75. The circuit for the solenoid 51, Fig. 19, is closed by depressing a treadle 107 to close a switch 54 while the solenoid 75 is energized constantly in accordance with three switching positions of a multiple switch 81 either, at an arbitrary selection of cuts, through a pre-selection switch 106 by shifting treadle 107 laterally about a pivot 138, Fig. 15, or automatically at an automatic cycle selection with varying directions of rotation of the drum 29, through a reversing switch 95, or at an automatic cycle selection with a constant direction of rotation of the drum 29 opposite to its normal direction, through a cut-out switch 80. If the machine is to be operated in arbitrary selection, the multiple switch is moved to the position shown in Fig. 19 To obtain a change of the position of the drum 29, the treadle 107 is shifted laterally about the pivot 138 either through an angle α or 2α, Fig. 18, from the position A, B or C to which it had been adjusted. When the treadle 107 is shifted laterally, it also shifts a control plate 108 provided with control cams 109, 124. At any such lateral shifting, cam 124 closes a safety switch 78, Fig. 17, while the pre-selection switch 106 will only be operated if it is engaged by one of two cam portions 126 on the cam 109. The switch 78 prevents the solenoid 51 from being energized should the treadle be depressed a second time in any position. When the treadle is depressed, the control plate 108 returns to its starting position under spring action. For the automatic cycle of operation with varying direction of rotation of the drum 29, the multiple switch is moved to the position shown in Fig. 21 and the reversing switch 95 closed. For the automatic cycle of operation with a constant direction of rotation of the drum 29, the multiple switch is moved to the position shown in Fig. 20, the reversing switch 95 opened and the cut-out switch 80 closed. For controlling the solenoid 75 in automatic cycle connections with a varying degree of rotation, direction changing means are provided. These comprise a pin 96, Fig. 1, mounted on the shaft 30 and operative, shortly before the end of an operating stroke of the solenoid 51, to engage and turn a reversing cam 97 so that one end of a pivotally-mounted lever 98 is shifted from a notch 100 to a notch 111 in the cam while the other end of the lever 98 operates the reversing switch 95. When the circuit of solenoid 75 is closed by the operation of reversing switch 95 or when it is opened by the reverse movement of the drum 29 or when the lever 98 again engages in notch 100, the position of the bifurcated member 67, Fig. 7, will be changed so that the drum 29 will reverse its direction of rotation at the next stroke of the operating head 53. To permit a change in the direction of rotation of the drum 29 after every, or every other, operating stroke, the cam 97 has an over-running zone 104 slightly shorter than would correspond to a turn of the pin 96 through an angle of 120 degrees and an overrunning zone 105 which is slightly shorter than would correspond to a turn of the pin 96 through an angle of 240 degrees. The pin 96 is axially adjustable by means of a manually-operable shaft 129, Fig. 5a, provided with a cam 131 having cam surfaces 132, 133 either of which is engageable by a spring-influenced pin 103.