Patent GB-309567-A (GB)
Title: Improvements in or relating to metal-cutting and like machine tools
IPC: B23Q5/14
Filed: 1928-10-17
Abstract: 309,567. National Automatic Tool Co., (Assignees of Galloway, R. M.). April 14, 1928, [Convention date]. Drilling-machines ; tapping. - A machine-tool is provided with a number of spindles mounted in a frame which carries a number of separate detachable driving units, each of these driving units being connectible to separate groups of spindles for operating the spindles. The main frame 11 is provided with a rotary work-table 12 and incorporates a chippan 13 having a screen 14 forming a. drain for coolant. Various machinetool units such as a drilling-unit 15, a tapping unit 16 or spot-facing or milling units may be arranged around the table, either horizontally, as shown, or at any desired angle. Brackets 17 having bearings 19 to receive the drill guides 20 may be provided and the drills 27 driven by an electric motor 26 may be mounted on a frame 22 which is fed hydraulically from a pump 25. In one form of tapping-unit, Fig. 2, a base 30 carries a driving unit 32 connected to a tapping-assembly 31 and also to a second tapping-fixture 34. The driving shaft 35 of the unit 32 is connected to gears 39 on tapping- spindles 40 carrying lead-screws engaging in nuts 42 fixed in a frame 43. The shaft 35 is also connected through the bevel gearing shown to a tapping-spindle 45. Various modifications of the number and location of the tap spindles may be adopted. In one form, Fig. 3, suitable for drilling spaced holes in a crank case the motors 70 may drive, through gearing contained in a gear box 53, a number of splined tap spindles 60 which are fed by nuts mounted on a front plate 56, the tap spindles being connected to the driving shafts 35 by trains of intermeshing spur gears. The gearing contained within the units 32 for imparting a reversing drive to the tap is shown in Fig. 6-8. The motor spindle is connected by chain and sprocket gearing 73 to a shaft 75 carrying loose gears 88, 105 the former engaging directly and the latter through an idler 106 with respective gears 107, 108 mounted on the shaft 35. A clutch collar 87 splined to a sleeve 85 secured on the shaft 75 is adapted to be selectively connected to the gears 88, 106 through friction clutches each comprising a series of plates 94 keyed to the shaft 75 and alternately arranged between plates 93 tongued to engage with a spider 90 integral with the driven gear. The shaft 75 carries sliding cam plates 99 so that when the clutch collar 87 is shifted one of the clutches is compressed to impart the corresponding drive to the shaft 35. The shaft 35 carries a worm 110 engaging a worm wheel 111 which is fitted with abutments 114, 115 coacting with a lever 116 secured to a pin 117 which also carries a double-armed lever 119. The clutch 87 is shifted by means of a fork 125 on a lever 123 one end 128 of which engages round a shaft 129 fitted with springs 143 which form part of a load and fire device for quick operation of the clutch. The lever 119 actuates a clutchshifting member 121 having projections 142 engaging one end of the springs 143 and coacting with spring-pressed latch-members 139. Thus, in operation, when one of the abutments 114, 115, engages the lever 116 the member 121 is shifted and compresses one of the springs 143 until a projection 142 disengages the latch lever from a collar 134 on the spring barrel, where upon the spring acts to give a quick throw-over of the clutch. The shaft 35 is thus given continuous forward and reverse rotations. In order to perform a single cycle and then transfer the clutch to a neutral position, a cylinder 148 operates a slide 146 which is notched at 150 and coacts with a biock 145 on the lever 123. When air is admitted to the cylinder, the clutch may be moved to the forward driving position. The air is then released whereupon the slide is moved back by a spring 149 so that after the reversal the clutch will be held in a neutral position until air is again admitted to the cylinder 148. For returning the tools quickly in case of emergency air may be admitted to a cylinder 153 having a piston 154 which engages an extension of the lever 119 to move the clutch to reverse position. The fluid pressure may be controlled by a four-way valve 156 operated by a handle 157 which in one position admits air to the trip-cylinder 148 and in the other to the emergency reversing-cylinder 153. Specification 305,978 is referred to.