Patent GB-733715-A (GB)
Title: Boring and milling machine and the like
Inventor: DEVLIEG CHARLES BENJAMIN
IPC: B23Q17/22
Filed: 1953-03-16
Abstract: 733,715. Operating clutches; change-speed gear. DE VLIEG CORPORATION. March 16, 1953, No. 7228/53. Class 80 (2). [Also in Group XXII] A boring and milling machine &c. comprises a tool spindle 31 releasably connected through an adjustable gear train (not shown) with a drive motor 5 and with a mechanism including a screw 107 for feeding the spindle, an output worm gear 69 freely rotatable on a shaft 72 to which it may be connected by a drive clutch 78, the shaft 72 being connectible by a forwardreverse clutch 94 to a gear train 125-131 continuously connecting the lead-screw to a handwheel 120 for feeding the tool spindle manually and being also operatively connected with a rapid traverse motor 176. The lead-screw 107 engages a threaded bracket 109 on the spindle head 132 and is rotated through clutch 94, a shaft 92, gears 103, 104 and a coupling 106. In the adjustable gear train the positions of two shiftable gear units are adjusted simultaneously to obtain six speeds by a knob 230 connected to shifter arms 241, 253 by a cam 232 having grooves in each face, coaxial shafts 237 and 249, gear segments 238, 250 and coaxial shafts 240, 252. The knob is associated with a dial 255 to indicate the linear speed of the head for each setting of the gears. The rapid traverse motor 176 drives through a unidirectional clutch 170 and sprocket 173 on the shaft 72, and is energized by moving a hand lever 182 attached at 184 to a rod 83. The lever moves a shifter 81 downwardly to disengage the clutch 78 and close a switch 186 in the motor circuit. Rotation of the lever 182 moves a shifter 194 controlling the forward-reverse clutch 94 through rack-and-pinion means 191, 192. Rotation of the feed-screw 107 causes rotation of an adjustable coarse-reading dial 153 through gearing 131, 130, 128, 126, 144, 145, 148, 150 and 151, one of the two latter gears having two teeth more than the other. Attached to the dial 153 is a dial 156 indicating the total movement of the head. A fine-reading dial 161 can be clutched direct to the shaft 129 carrying the gear 130. The clutch 78 may be automatically disengaged to stop a feed movement by a pin 220 which is set to engage a plunger 22. The plunger 222 actuates a switch to energize a solenoid 214 to rotate a shaft 207 and withdraw a plunger 200 which normally retains the shifter arm 81 in clutch-engaging position. In operation, the lever 182 is moved to shift the clutch 94 and energize the motor 176 to move the tool rapidly to the work. The lever 182 is then moved to stop the fast approach and the dial 153 is set so that the pin 220 will disconnect the feed after the predetermined cut, the dial being preferably marked in inches of feed of the cutter. The dial 161 is set with its zero mark on a pointer 161a. The cutter is then fed in until the pin 220 disengages the clutch 78 about <SP>8</SP>/ 1000  of an inch before the full depth has been reached. The cut is then completed using the handwheel 120 and the dial 161 calibrated in <SP>1</SP>/ 10,000  inch. Alternatively, the solenoid associated with the shifter 81 to stop the feed may be actuated by a switch 290 actuated by a dog on a stationary turret 260. The final feed is then made using a dial gauge 293. The turret is used for repetition work, the dogs being set to engage the switch 290 when each feed setting has been determined by use of the dial 153. Dogs 304, 305 on the head co-operate with a switch plunger 302 to cut off both drives at the limits of movement of the head.