Patent GB-512915-A (GB)
Title: Improvements relating to copy milling machines
IPC: B23Q35/10
Filed: 1938-03-21
Abstract: 512,915. Milling machines. DECKEL, F. March 21, 1938, No. 8648. Convention date, March 27, 1937. [Class 83 (iii)] A copy-milling machine has at least one milling-spindle for heavy work, and at least one spindle movable in a number of directions, for light work. The frame 1 carries a pantograph system 2 which is pivoted at 3 and coupled at 4 to a slide 5 movable in all directions in the manner described in Specification 456,261, and carrying an adjustable tracer pin 7 mounted in a holder 8 and a tool-spindle 10 adjustable in height by a screw 11. The spindle 10 is driven from a motor 12 through-belt gearing comprising a primary belt driving a shaft 13 and a secondary belt connecting this shaft to the toolspindle the belts being enclosed by casings 14, 15, the latter being tiltable to permit vertical movements of the tool spindle. For heavy work an additional milling-spindle 20 carrying a cutter 21 is adjustably and detachably fixed to the forward extension 25 of the frame 1, and is driven from the motor 12 through toothed gearing which permits adjustment of the spindle 20 round two perpendicular axes. The speed of the spindle 20 may be adjusted from a control 26. The projection 25 also carries a pair of compound slides 28, 29 operable either by hand wheels 32, 31 respectively or automatically from motor 12 under the control of lever 33. In some cases the automatic slide movements may be determined by adjustable stops. The compound slides may be coupled to the tool-spindle by a member 30 so that spindle 6 and tracer 7 may be controlled horizontally by the slides 28, 29; but are freely movable vertically. The frame also carries a work table 34 mounted on compound horizontal slide's operable either from hand wheels 35, 36 or from a motor at variable speeds, the automatic movements being controlled by stops 38 and levers 39. The table is adjusted in height from a hand wheel 40. For, copying on a 1:1 scale with stationary cutter and 'tracer the table 34 is adjustably connected by brackets 43 to a trailing pattern table 41 sliding on a second pattern table 44 which has a compound horizontal adjustment from hand wheels 45, 46 and a vertical adjustment from a hand wheel 47. The slide 5 is placed in the right hand position and the tracer, oversize if necessary to obtain excess dimensions, fixed in the required position, the belt drive to spindle 6 being disconnected. The coupled tables 34, 41 are then moved together either by hand or by the automatic gearing. In a modification, a number of trailer tables 41 controlled from the work table 34 may be provided. For further milling, the head 22 is removed and a single point cutter mounted in spindle 6 the tracer being' adjusted at the same distance from the spindle 6 as it was from the cutter 21. The tables are now kept stationary and the cutter and tracer moved over the work by means of the compound slides 28, 29. For finishing, the member 30' is removed and the tracer and cutter operated from the pantograph mechanism. For enlarging or reducing work with stationary cutters and tracer the trailing table 41 is removed and the tables 34, 44 driven at different speeds through the gearing shown in Fig. 3. For this purpose a motor 55 drives through gears 56 and change-speed gearing 61 a shaft 63 connected through reversing gearings 65. 77 to the feed screws of the compound table slides. Further reversing-gearing 81 connects shaft 63 with the vertical feed screw 82. Shaft 63 is also connected through gears 86 and infinitely variable gear'89 to a shaft 90 which is connected by gearing similar to the work table gearing to the vertical and horizontal feed screws of the pattern table 44, any required speed relation between the tables being obtainable from the variable gearing 89.