Patent GB-444016-A (GB)
Title: Improvements in speed controlling and reversing mechanisms for the work tables of machine tools and like machines
IPC: B23Q5/54
Filed: 1934-09-04
Abstract: 444,016. Speed-controlling and reversing gearing for work tables. WANDERERWERKE VORM. WINKLHOFER & JAENICKE AKT.-GES., Sch÷nau, near Chemnitz, Germany. Sept. 4, 1934, No. 25441. Convention date, Sept. 4, 1933. [Class 83 (iii)] The work table of a milling or other machine tool is operated by changespeed and reversing mechanism both controlled by a single lever which is connected to two trip members which are arranged to move one of the control devices to the same operative position when the control lever is moved in different directions. The transverse table 2 carries a longitudinal work table 3 driven from a main shaft 4. The high speed of the table is derived from gears 6, 7 and clutch 8 and the feed speed is derived from change-speed gearing (not shown), gears 11, 12 and clutch 14, the speeds being selectively engaged by a sliding splined clutch member 16 controlled by a rotary spindle 58, carrying a lever 52, which is normally biassed in the feed-clutch engaging position by a spring 55. The splined shaft 5 is connected through gears 17, and bevel gearing 19 to a pair of bevel gears 20, 21, which rotate loosely in opposite directions on a splined shaft 22 connected through gears 23 to a rotary nut on the table feed-screw 26. The gears 20, 21 may be maintained in a neutral position or may be selectively engaged to determine the direction of the feed by sliding clutch members 32, 34 movable with the splined shaft 22 by means of a lever 28 connected resiliently at 65 to a spindle which carries a gear segment engaged by a similar segment carried by a spindle 37 on which the control lever 36 is mounted. A bar 39 pivoted to the control lever carries a sleeve 40 which through a spring 43 operates a member 45 having a terminal portion which slides between rollers 53, 54 on the part 52 and which carries a pair of trip members 49, 51 adapted when the member 45 is moved in either direction to impart anticlockwise (Fig. 6) movement to the spindle 58. The lever 36 has intermediate positions V, V<1> between which the spindle 58 is not operated. In operation, when the main shaft 4 is started the feed speed is normally engaged by the spring 55 but the feed is not operated because the reversing clutch shaft 22 is in neutral position. The work table may then be adjusted by hand from a wheel 75. For engaging the automatic feed the lever 36 is moved to the right to position V for " right " feed and to the left to V<1> for " left " feed. This action turns the shaft 64 and places a projection 70, Fig. 2, in the position V or V<1>. In order to move the table at high speed over gapped parts of the work the lever 36 is moved and held by hand in one of its extreme positions E, E<1> thus causing the member 50 to actuate the shaft 58 and engage the high speed. In this position the projection 70 is moved to a position E or E<1> where it may coact with dogs 71 or 72 which engage the projection and re-engage the feed speed before the tool strikes the work. The terminal stops 73 on the table move the projection 70 back into the central position thereby moving the control lever back to neutral and stopping the table. In a modification the movement between the positions V and V<1> may operate the changespeed device while movement to either of the extreme positions actuates the reversing mechanism.