Patent GB-1022495-A (GB)
Title: Table milling machine with several milling spindles
IPC: B23Q1/48
Filed: 1963-10-23
Abstract: 1,022,495. Woodworking. A. MANASEK, and F. MANASEK, [trading as HEMAG MASCHINENBAU]. Oct. 23, 1963 [Oct. 29, 1962], No. 41836/63. Heading B5L. A machine for working wood, plastic and the like comprises several milling spindles 8a, Fig. 1, carried on a support which is disposed beneath the table 3 of the machine and can swivel around a vertical axis so that any one of the spindles and a cutter 15 carried thereby can be aligned with an aperture 7 in the table and raised vertically through the aperture to a working position. The support 12, Fig. 2 (not shown), is in the form of a drum rotatable on a vertical column 9a, 9b, Figs. 4 and 5 (not shown). The drum is of prismatic shape and carries on its flat surfaces sleeves 13 which can be clamped to bearing sleeves 14 supporting the milling spindles, the bearing sleeves being vertically adjustable in the sleeves 13 to determine the vertical positions of the cutters 15 when the spindles are in their working positions. The drum has tapered surfaces 21, 22 which cooperate with complementary surfaces 24, 25 on the table 3 and a member 25 movable upwardly by pins 59 on a block 58 connected by a link 57 to an eccentric shaft 55a to hold the drum in its working position; a locking pin also engages holes in the drum to positively lock the drum in position, the pin being actuated by rotation of the shaft to disengage the hole and enable the drum to be manually rotated to position a selected spindle 8a beneath the aperture 7. A roller 18 on a spring-urged arm 19 engages one or other of notches 20 to initially locate the drum. A vertical guide 28, Fig. 5, is fixed adjacent the column 9a, 9b and slidably supports a guide 29 having a roller 32 which engages a flange 31 on the bearing sleeve 14 of the spindle disposed beneath the aperture 7 in the worktable so that as the slide is raised by a chain drive 81 connected by a shaft 68 and chain drive 86 to a hand wheel 72, the spindle 8a and cutter 15 are raised through the aperture to a working position above the table 3 which has fences 5, 6 adjustable by a device 4. A weight 40 is connected by a cable 39 to the slide to counterbalance the weight of the slide and bearing sleeve assembly. A box spanner 17 is provided to operate the clamping sleeve 13 to secure the spindle in its raised position. Each spindle has a V-belt pulley 44, the pulley in the working position being driven by a belt 43 from a motor 41 which is vertically slidable on a guide 45 and rockable about the guide to tension the belt by a counterweight connected to an arm 49 of the motor by a cable 50. The motor is vertically movable in unison with the slide 29 by a chain 86 which is connected to a lifting ring of the motor and to sprockets 81a, 85 on the shaft 82 connectable to the hand wheel and the shaft 76 having the sprocket 80 for the chain 81a connected to the slide. The eccentric shaft has a portion 55c which operates a locking pin 71 for connecting together the sprocket 81a on the shaft 82 and a sprocket 74 on a hollow shaft 73 of the hand wheel 72, the sprocket 74 being connected by a chain 75 to a sprocket 77 connected by a coupling 78 to the shaft 76. In operation, when a spindle 8a in a working position is to be replaced by another, the clamping sleeve 13 is released by the box spanner 17 and the hand wheel 72 rotated so that the hollow shaft 73, and shaft 82 which is adjustably connected to the hand wheel by a lever 83, rotate to cause rotation of shaft 76 so that the chain drives 81 and 86 lower the slide 29 supporting the working spindle and the motor 41. As the motor is lowered, a follower 52 engages a guide 54 to swing the motor about the guide 45 and release the tension of the belt 43, and a roller engages a fork 69 on the eccentric shaft 55a which is thereby rotated to cause the link 57 to withdraw the tapered surface on member 25 from the tapered surface 22 and the locking pin to disengage the drum 12 which is thus freed for rotation. The lowermost position of the bearing sleeve for the spindle is determined by a headed bolt 38 but the slide 29 and motor can be lowered sufficiently for the belt to be clear of the pulley 44 to enable the drum to be rotated to position another spindle in alignment with the aperture 7 in the table 3 without interference by the belt, the drum being rotated manually when a door 87 is opened. The rotation of the eccentric shaft 55c also withdraws the looking pin 71 so that the lever 83, upon withdrawal of a pin 84 disconnects the hand wheel from the lever. Rotation of the hand wheel 72 disconnects a coupling 78 so that the chain 86 is moved without movement of chain 81 to vary the height of the motor relative to the slide 29 and bearing sleeve and the engagement of the belt 43 with the pulley 44. A fan 91 on the spindle 8a prevents chips passing through the aperture 7 into the base of the machine.