Patent GB-525507-A (GB)
Title: Improved driving mechanism for milling, boring and like machines
IPC: B23C1/02
Filed: 1939-02-22
Abstract: 525,507. Milling, boring &c. machines. OLIVETTI, C. Feb. 22, 1939, No. 5960. [Class 83 (iii)] In a driving device for a milling, boring or other machine tool a driving shaft 9 is connected to a tool carrying sleeve 30 through a series of gear pairs carried in a housing which may be moved angularly about the axis of the driving shaft to adjust the cutter and secured to a fixed frame 4 in any required position. The work table 2 moves on a bed 1, which supports the frame 4 having front and rear openings which accommodate bearing bushes 7, 8 for mounting the fixed driving shaft 9 carrying the driving pulley 10. The frame also has part-circular T-slots 11, 12 on one side and 15, 16 at the other, these slots being concentric with the axis of the driving shaft. A movable housing 17 is located within the fixed frame and is mounted on extensions of the bearings 7, 8, being secured in any adjusted position by bolts engaging the circular slots. The movable housing consists of front and rear walls 21, 22 and has cylindrical openings to provide bearings for intermediate shafts 54, 50 and for the cutter sleeve 30, the latter being held against rotation by a key 40 which permits axial movement of the sleeve. The shafts 9 and 50 and the cutter sleeve 30 are coplanar. Axial movement is imparted to the cutter sleeve by a screwed member 41 carrying a hand wheel 42 and engaging over a reduced threaded part 33 of the sleeve. A graduated ring 44 determines this adjustment. The cutter spindle 35 is mounted in a cylindrical rear bearing 34 and a front conical blearing 31, adjusted by a split nut 45, and having a conical recess in which the tapered end 36 of the cutter arbor is secured. A gear 49 on the cutter-spindle engages a long gear 51 on the shaft 50 thus permitting axial spindle adjustment. The shaft 50 is connected by a gear pair 52, 54, with the shaft 55 which is connected by a further gear pair to the driving shaft. The gear at the rear of the housing and the gears 49, 51 at the front form. change gears for altering the spindle speed. Adjustment of the movable frame round the driving shaft to alter the height of the cutter is effected from a vertical screw 58 carrying a graduated handwheel 59 and engaging a nut mounted between flanges on the frame. Another cylindrical bore in the movable frame carries a fixed rod 62 passing into a pivoted member 63 which provides an outboard support for the cutterspindle. The member 63 is pivoted to a hollow frame 65 adjustable in the direction of the cutter axis. A circular slot in the frame 65 enables the support 63 to follow the angular movements of the cutter housing and be secured by a bolt. The outboard support may include a tail centre engaging the outer end of the cutter arbor. A cushioned drive is provided between the pulley 10 and the driving shaft. For this purpose the pulley carries bolts 80, Fig. 12, having limited movement in slots in a member 77 which may be coupled by teeth 76 to a collar 74 on the driving shaft, the cushioning being obtained from a pretensioned spring 84.