Patent GB-190813193-A (GB)
Title: Improvements in Gear Cutting Machines.
Inventor: MURRAY ARISTIDES REYNOLDS
Filed: 1908-06-20
Granted: 1909-06-21
Abstract: 13,193. Murray, A. R. June 27, 1907, [date appliecd for under Section 91 of Patents &c. Act, 1907]. Milling; dividing-apparatus.- In a gear-cutting machine of the blank - pillar and cutter - slide type, the feed-clutch reversing- lever is provided with a pivoted rocker portion which may be moved a considerable distance before the lever is operated, the lever being automatically looked to prevent the feed from being put into action before the indexing is completed. The indexing of the wheel is effected through friction-driven means, one of a number of stop disks moving at different speeds being engaged by a latch and released periodically ; this provision of a number of stop disks enables the amount of the indexing motion to be quickly adjusted. Thereversing- lever 97, Fig. 1, actuating the feed and reverse clutches 63, 93 through which the feed screw 60 is driven, is provided with a pivoted rocker portion 102 which has an amount of play with regard to the lever determined by the edges 103, 104. This rocker is operated by stops 112 on a reversing-rod 111 actuated by tappets on the cutter slide and carries a roller 105 engaged by a spring catch 106. The stop 112 moves the rocker until it passes the crest of the catch 106 and the latter then takes up the play and moves the lever out of contact with one clutch and, when the automatic stop is down, into contact with the other. The feed-clutch 63 is driven from the main shaft 3 through change gearing 65 and a worm 64; the reverse clutch 93 is driven through change gearing 83 from a bevel-driven shaft 10, shock-absorbing means 90 being provided in the drive. The cutter shaft 13 is driven from the shaft 10 and drives the cutter spindle 24, Fig. 2, through a worm-wheel 34. The cutter 43 is given a rough adjustment for position by rings 43<a> and a fine adjustment by transversely moving the cutter slide 26 by means of a screw 51, the worm 34 being splined to allow this. The saddle 5 is roughly L-shaped, Fig. 21, the projecting arm clearing the blank-pillar and giving a good bearing ; wear of the saddle is taken up by a tapered gib 55 adjusted by screws 55<a>. The indexing worm-wheel 235, Fig. 2, is driven by a worm on a shaft 210 which is driven through change gearing from a shaft 122, Figs. 4 and 12; this indexing-shaft 122 is constantly frictionally urged and carries a fast disk 134 and loose disks 138, 139, driven by a pinion 136 through back gearing. The disk 134 has a notch engaged by a latch 152 mounted.on a rocking shaft 148, and on the reverse motion of the reversing-rod 111 the latch is lifted and the indexing-shaft is given one revolution, the latch again engaging the notch. If the disks 138, 139 are driven at one-fourth the speed of the disk 134 and one has one notch and the other two, by shifting the latch to engage one of these disks double or quadruple indexing movement is obtained. The shaft 122 drives through change gearing a shaft 184, Fig. 9, which drives the shaft 210 through bevel-gearing carried in a pivoted box 204 ; a worm 239 on this shaft 210 drives the indexing-wheel 235 and, to allow rapid setting of the latter, the worm may be moved out of contact therewith by means of a nut 246 which engages a screw on the worm housing 248 and moves the latter along a slot on a bracket attached to the machine frame, the pivoted box 204 allowing such movement. The blank arbor 231, Fig. 2, is carried in a tapered spindle 236 mounted in a saddle which is moved up and down the pillar by a screw 234. The rocking shaft 148 carries a bell-crank lever 178, Fig. 4, which may also be operated by hand ; this raises a safety stop into the path of the reversing- lever 97 while the latch is lifted and so prevents feed until indexing is completed. A handle is provided for giving a quick movement of the feedscrew 60, but the handle is normally disconnected from its shaft.