Patent GB-191414283-A (GB)
Title: Improvement in Grinding Machines.
Inventor: NORMAN CHARLES EDWARD VAN
IPC: B24B19/06
Filed: 1914-06-13
Granted: 1915-07-13
Abstract: 14,283. Norman, C. E. van. June 13. Disk apparatus. - A machine for grinding and polishing the ball races in ball bearings comprises a head B carrying the rotating grinding-disk D, and a head G carrying the rotating work - holder G<3> and adapted to be oscillated about an axis y at right-angles to the axis of the work-holder. The head G is slidably adjustable on a second slide H movable on a base member J whereby it can be moved in a direction radial to the axis of oscillation y and also in a direction at right-angles thereto. The member J is connected to the upper end of a post K, Fig. 8, and has a bearing on the surface of a flange A<3>. The axis of the post coincides with the axis y, and at its lower end has loosely mounted thereon a member L in which is a socket b adapted to receive a locking-pin d carried bv a member c secured to the post. The member L has pivotally secured thereto at L<1> one end of a link M, of adjustable length, adapted to impart the oscillatory motion to the head G, and the post may be connected or disconnected while the oscillation-imparting mechanism is in operation, by moving the pin d, for which purpose a rotary member e<5> with an eccentric portion e<6> is provided, adapted to engage the collars e of the member carrying the pin d. The field of oscillation of the head G may be varied by varying the relative angular positions of the two parts f, f<2> of which the member L is made up. The link M is pivoted at its other end to a lever P pivoted at P<1> and having a roller engaging a cam 0 mounted on a rotating shaft N, whereby the oscillatory motion is imparted to the head G, and the range of oscillation may be varied by varying the point M<3> at which the link is pivoted to the lever; a spring M<2> prevents lost motion. The grinding-head B is mounted for cross-traverse on a slide E, which itself is movable by means of a lever E<4> and a rack and pinion E<5>, and a screw stop g is provided at its end for positioning the grinding-disk. The cross-traverse is automatically brought about by means of a thrust-rod S<2>, Fig. 2, adapted to be moved vertically by means of a projection S on the cam 0 to engage a pivoted plate S<3>, which in turn engages an adjustable screw R<2> on an oscillatory arm R mounted on a shaft Q<2>. The arm engages, by means of an abutment member R<3>, a pivoted member Q<6> carrying a pawl Q<7> adapted to engage a ratchet-wheel Q<3> and thus, through spur gearing, to rotate a feedscrew Q engaging the head B ; the feed may be varied by adjustment of the screw R<2> to give more or less lost motion between it and the plate S<3>. The feed may be automatically stopped by means of a disk h with a projection h<3> mounted loosely on the shaft Q<2> and adapted to be set in any desired position and clamped by a screw h<4>; the projection comes under the pawl and prevents its engagement with the ratchet-wheel. For grinding races of the form shown in Fig. 14, the work head is arranged to oscillate to and from the position shown in dotted lines in the Figure to grind the part x<2> of the race, and then to remain in the position shown in full lines, the grinding-head then being axially reciprocated to grind the parallel part x<3>. This axial reciprocation is brought about by a second cam on the shaft N engaging a roller on a pivoted lever carrying an adjustable block, to which is pivoted a link V connected to a supplemental slide W, Fig. 11. The slide W is mounted beneath the slide E and relative motion of the two slides is brought about by a rack and a pinion E<5> operated by a handle E<4>. The screw stop g<2> carried by the slide E in this case abuts against the slide W. In order to position the work, stops are provided on the head G and the slide H, which stops are adapted to co-operate with gauges.