| 摘要 |
1,218,376. Copy-machining. STARRFRASMASCHINEN A.G. 24 Oct., 1968 [27 Nov., 1967], No. 50612/68. Heading B3K. [Also in Division G3] An automatic tracer head for a copying machine tool having a tracer 5, 11, arranged to be axially movable and mounted to pivot and having a precontrol unit acting to bias the tracer in a given direction in the copying plane is provided also with a sensing device 8, 9 which responds to lateral deflections of the tracer, i.e. deflections outside the copying plane, which may be caused by the wedging action of a sloping and angled sidewall 34 of the template being copied, the sensing device 8, 9 being coupled to a correcting unit 30, 2, 4 which co-operates with or acts against the precontrol unit to deflect the tracer (e.g. in the case shown, upwardly) in a direction to eliminate the lateral deflection. Signals from the sensing device 8, 9 are used through solenoid 4 to displace the lever 30 against the tracer head 12 thereby displacing the precontrol pressure roller 13 which is disposed opposite the lever 30. In result the precontrol head is rotated by the motor 16 and the tracer adopts a new course till equilibrium of the precontrol head is again reached and the tracer again lies in the copying plane in contact with the template. In a first modification (Fig. 6, not shown) two levers (48, 49) operable on the tracer head (12) alternatively according to the tracing direction, are provided, the levers being arranged symmetrically with respect to the precontrol pressure roller (13). In a third embodiment (Fig. 11, not shown) a threshold value switch is controlled by an electromechanical transducer (74) responsive to lateral deflections of the tracer which brings a comparison circuit into operation whereby the instantaneous position of the precontrol unit is compared with the signal from the sensing unit (9) and the tracer is correspondingly deflected. In a fourth embodiment (Fig. 23, not shown) the signal indicating lateral deflections is used to move the normally stationary coil (22) of an electromechanical transducer forming part of the precontrol unit. In a fifth embodiment (Figs. 26-28, not shown) two proportionally acting solenoids (85, 87) are attached directly to the tracer at an angle to its axis, one or the other solenoid being energized above a threshold value of the lateral deflection in dependence upon the tracing direction. |
