Patent GB-191416582-A (GB)
Title: Improvements in and relating to Multiple Table Milling Machines.
Inventor: POTTER JAMES CHARLES
IPC: B23Q16/06
Filed: 1914-07-11
Granted: 1915-08-11
Abstract: 16,582. Potter, J. C. Oct. 1, 1913, [Convention date]. Milling - machines.- A milling-machine has multiple work - holding surfaces on a table on a turret so that the work - pieces may be brought successively beneath the milling-cutter. The turret 10 is mounted in the bed of the machine, and carries on its upper face, a number of work-holding surfaces 17 on a table 16 traversed beneath the cutter by a screw 18 carried by the slide engaging a nut 19, Fig. 9, fixed to the turret. The screw is geared to a splined shaft 20 driven thfough reversing-bevels from a shaft 23, or by hand through spiral gearing from a transverse shaft. The clutch controlling the reversing - bevels is operated by a rack 28 and pinion 29, Fig. 7, from a cross-shaft 30 which carries two levers 29 having spring plungers to keep the clutch in the adjusted position. The clutch may be actuated by hand or automatically through arms 31, Fig. 6, of the levers 29 contacting with vertical plungers 32 in the turret coacting with adjustable stops 33 on the work slide to return the clutch to the neutral position. The levers 29 are also provided with tails 34 adapted to contact after rotation of the turret with a spring plunger 35, controlled by a pivoted catch 38 operated to release the plunger, by pivoted stops 40 carried by the turret, to throw over the clutch to reverse the rotation of the screw. The turret is rotated from the shaft 23 through a disk carrying a ring 42 expanded to clutch the disk to a flange depending from the. turret, by a conical sleeve 46 and levers 45. The sleeve is actuated by a projection on the treadle 49 and a yoke 50, an index bolt 54 being at the same time withdrawn by a lever 52. The treadle is held depressed by a catch 56 tripped by a stop plate 59 geared at 61, 63 to the turret. Hand rotation of the turret is provided for at 67. A. friction plunger 68, Fig. 13, is also adapted to be actuated by the treadle release to grip the turret. The plunger is adjustably mounted in a hollow stud 69 screwing into a fixed bush 70 as controlled by gearing 71 from a rock-shaft actuated through a rod 76 having a pin-and-slot connexion with a lever 79 fixed to the treadle. As the treadle is depressed, the nut 69 is rotated and the plunger is withdrawn from the turret, but on release of the treadle an adjustable stop 83 releases a catch 81 which has held the rod 76 down so that the rod is released and a spring lifts it to rotate the nut in the opposite direction to press the plunger against the turret. The shaft 23 is driven through worm gearing 85 from a shaft 86 driven at a fixed rate for turret rotation and at a variable rate for slide feed through two sets of gearing from the same driving-member. Loose on the shaft 86 is a pinion 87 in gear with a pinion on a shaft 90 driven by gearing 91 from a member 94,. adapted to be clutched through a hand-lever 'from the front of the machine to a driving-shaft. The gearing 91 also drives the shaft 86 at varying rates through change gearing 98 and a sliding clutch 101. The pinion 87 is clutched to the shaft when required, and if the slowest feed speed does not require a lower speed for the shaft 86 than that for turret rotation the clutch may be of the' roller ratchet type. The clutch 101 is actuated through a lost-motion connexion 102 from the treadle 49, so that the locking-bolt 54 is released before the turret starts to rotate. The cutter shaft 13 is mounted on a slide 106 and has an outboard bearing 107 supported by bars 108, 109. The Specification as open to inspection under Section 91 (3) (a) states also that the worksupporting surfaces may be in the form of separate independently movable slides; this subject-matter does not appear in the Specification as accepted.