Patent GB-190810502-A (GB)
Title: Improvements in or relating to Grinding Mechanism for Trueing the Teeth of Toothed Gears and the like.
Inventor: WARD FREDERICK ALEXANDER
IPC: B23F23/12
Filed: 1908-05-14
Granted: 1908-11-25
Abstract: 10,502. Ward. F. A., and Taylor, W. N. May 14. Dressing grinding- wheels.- A grinding-machine for trueing the teeth of toothed gears and the like, having a grinding-wheel with its operative portion shaped to suit the surface of the teeth to be ground and adapted to grind a series of similar surfaces, is provided with means by which the operative portion of the grinding-wheel can be trimmed intermittently. These means can be actuated manually or automatically, and automatic means are also provided for feeding the grinding-wheel forward intermittently as it wears. The grinding-wheel 4, Fig. 1, is reciprocated on a slide 2 and passes between the teeth of the gear wheel 5, which is mounted on a vertically adjustable mandrel 64 and is intermittently rotated to present fresh teeth to the action of the grinding- wheel. The grinding-wheel 4 is mounted in brackets 6, which are vertically adjustable by a screw 7 on a head 3<a> at the front of the carriage 3, which is reciprocated along the slide 2. The carriage 3 is moved from right to left by a bowl 20 engaging a cam-groove 21 in a revolving cylinder 18, driven by a gear 22. As it comes to the end of its journey, a screw 11, Fig. 8, which passes through an arm 10<a> carrying a pawl 9, comes into contact with the slide 2 and causes the screw 7 to be turned slightly and to feed the grinding-head down a little. The carriage then reverses its motion and is fed forwards slightly until the bowl 20 enters a circular portion a<1> of the cam-groove 21, when the carriage pauses, and the curved portions a of the operative surface of the grinding-wheel are trimmed by diamonds 40 carried in supports 30. The carciage then moves on until the grinding-wheel is over the front trimming-mechanism, when the carriage pauses again in its travel, and the diamonds 49 are raised into contact with the edge or bead b of the grinding-wheel and trim it. The rear trimming-mechanism comprises diamonds 40, on each side of the wheel, which are carried on arms 39 mounted on horizontal axes 37, and supported in vertically adjustable spring-controlled posts carried in horizontally adjustable sockets 30. The diamonds 40 are moved outwards over the surfaces a of the wheel 4 by the vertical motion of a spring- controlled plunger rod 44, a pin on the top of which engages slots in arms attached to the axes 37. The lower end of the plunger rod bears on a conical collar 45, which slides along a shaft 46, and is operated at the right instant to raise the plunger rod by a collar 83 moved along the shaft by a bowl 84 which engages the cam-groove 21 on the roller 18. The front trimming - mechanism comprises diamonds 49, Fig. 3, carried on vertical arms 52 which normally tend to spring apart and which are held together by bowls 58 mounted on arms 57. The arms 52 form part of a plunger rod 51, which is raised at the correct instant against the action of a spring 54 by the rotation of a cam 48 on the shaft 46. As the rod is raised the bowls 58 pass from the raised surfaces e on the arms 52 to the surfaces f and allow the diamonds to fly apart and pass over the bead b of the grinding-wheel. The shaft 46 is rocked to operate the cam 48 by a pin 60 on the drum 18 coming into contact with a pin 59 on the shaft 46. The shaft is returned to its normal position by a spring 61, a stop 62 preventing it from being turned too far.