Patent GB-190715576-A (GB)
Title: Improvements relating to Grinding Machines
Inventor: TAYLOR GEORGES FREDERICK
Filed: 1907-07-06
Granted: 1908-04-09
Abstract: 15,576. Taylor, G. F., and Rochefort, H. July 6. Surfacing.-In grinding-machines for the production of work of uniform size such as spindles or [shafts, in order -to overcome the effect of the variations of the diameter of the grinding-wheel due to wear &c., two or more devices are arranged so that when touched by the grinding-wheel they liberate trip devices which cause the feed of the grinding-wheel to be diminished and finally to be arrested. Pivoted stops b, Fig. 1, are carried on slides c on pedestals d on the machine table, and are provided with diamond tips j, which are not worn away by contact with the grinding-wheel h. These stops are arranged so that the grinding- wheel comes into contact with one of them just before the diameter of the work approaches its finished size and with the other when it has attained the correct size. The contact of the grinding - wheel with the stop causes it to tilt and release a bell-crank a which, under the influence of a spring i, lifts a rod e and thus lowers a pivoted abutment.f into position to operate a clutch to diminish the rate of feed of the grinding-wheel or to stop it. The second. abutment may be adapted to act on the same clutch as the first, to move it into an inoperative position ; or it may act on an independent feed arresting clutch. The grinding- wheel is fed forward at the end of each traverse of the table by a ratchet-wheel p, which is rotated by a pawl q on a spring-controlled plunger r depressed by a lever s on a rocking shaft t which also carries an arm u which comes in contact with stops v on the travelling table at each end of the traverse. The ratchet-wheel is connected through gearing z, one of two trains of gearing l, k, shafts m, n, and bevel-gearing with the screw n<1> which feeds the grinding-wheel slide. A hand-wheel is provided at the end of the shaft m. When the grinding is in progress, the coarse feed train k is normally clutched to the shaft x. When however the grinding-wheel touches the first pivoted abutment b, shown on the right of the machine in Fig. 3, the abutment f is dropped into the path of a lever 2, which is moved by contact with it at the end of the traverse of the table and, through the medium of a bell-crank on the shaft 18, moves the clutch w on the shaft x to put the fine feed train l into gear. When the work is ground to size, the second pivoted abutment b is actuated and the abutment f<1> ia dropped into the path of a lever 3, which by its consequent motion moves the clutch w into an intermediate position and stops the feed. The table is traversed by a rack 4 and pinion 5 operated by a hand-wheel 6 or automatically through bevel-gearing 7, 8, 9, 10 and belt pulleys 11. The required reversal is brought about by the movement of the arm u on the shaft t which operates a suitable clutch through levers 12, 13. The full movement of the clutch is ensured by the recovery of the spring on the plunger r, which causes the movement of the lever s and its associated mechanism to be completed. The abutment f<1> when dropped into its operative position causes the Jever 3 to come into contact with a suitably-disposed arm 14 on the shaft t and to move the clutch into its inoperative position and stop the traverse of the machine.