Patent GB-100950-A (GB)
IPC: B24B49/02
Filed: 1916-07-15
Abstract: 100,950. Maag, M. July 17, 1915, [Convention date]. Feed devices.-Automatic adjustment of a grinding-disk, to compensate for wear and to set the disk in correct position in relation to the face of the work, is obtained bv a feeler lever arranged to bear upon the work, or the disk, and to make or break an electric circuit by which the adjusting-device is controlled. In the arrangement shown in Fig. 1, one end of a pivoted feeler 24 is pressed by a spring upon the surface of the work 23 on the reciprocating table 22, while the other end bears upon the end of a lever 29 which, under the tension of a spring, tends to close the contacts 31, 33 and to complete a circuit through the electro-magnet 12. The magnet is mounted on a rotating spindle 8; when excited, it attracts its armature 39, the point of which is caused to engage the toothed wheel 14, which is thus clutched to the spindle and, by means of wheels 15, 16, rotates the screw 17 and causes the slide 19 which supports the grinding-disk 21 to move downwards. In order to provide for grinding on both strokes of the work table, the feeler and contact-making apparatus is duplicated on the other side of the disk. The device shown in Fig. 2 is adapted for compensating for wear of the periphery of the grinding-disk 21. The spindle 8, driven by the pulley 11 and worm 10, has splined upon it one member 40 of a claw clutch having an annular groove to receive the end of a sliding rod 45; the rod is held in the groove against the action of a spring 48 by a locking-lever 51. The pivoted feeler 24 has a diamond point 26 to engage with the grinding-disk, and a stud 56 to bear upon the edge of a disk 54 on the spindle 8 and so to keep the diamond point away from the disk, except when the notch 55 is opposite the stud; the feeler is then free to move its action, and, if the size of the grinding-disk has become reduced beyond a certain amount, it completes, by means of the contact 31, the circuit of an electro-magnet 57, which draws aside the locking-lever 51 in opposition to its spring 53 and liberates the rod 45, which is then shot outwards by its spring 48. The clutch member 40, now freed, is moved upwards by a spring into engagement with the cooperating member 41, which, by means of the wheels 42, 58, crank-disk 60, pawl 61, and ratchet-wheel 63, imparts motion to the screw of the slide in which the grinding-disk is carried. The clutch is engaged for part of a revolution only; it is drawn back bv a stud 65 thereon engaging a fixed cam 66, and the rod 45 is advanced to engage in its groove by the engagement of a stud 68 with a cam 67 on the wheel 9, its locking- lever being now free to engage as the electromagnet is no longer excited. If, however, the movement of the slide has not been sufficient to advance the periphery of the disk to such a position that it will prevent the feeler from completing the electric circuit when the notch in the disk 54 is opposite the stud 56, the magnet is again excited and the operation repeated. The devices shown in Figs. 1 and 2 may be combined in a single apparatus, the one to perform an initial adjustment to bring the disk into position, and the other to effect the adjustment to compensate for wear. This combination is stated to be applicable to machines for grinding toothed wheels. The adjustment may be supplied to the worksupport instead of to the disk. In the Specification as open to inspection under Sect. 91 (3) (a) it is stated that the feed may be actuated by an electric motor started and stopped by the movement of the feeler lever. This subject-matter does not appear in the Specification as accepted.