Patent GB-191011797-A (GB)
Title: Improvements in Wood Working Machines.
Inventor: NORRIS ARTHUR BROOKS
IPC: B27M3/20
Filed: 1910-05-12
Granted: 1910-12-15
Abstract: 11,797. Norris, A. B. May 12. Carving. -- A woodshaping machine of the kind in which the cutter is guided by a pattern or templet, more particularly for trimming shoe lasts after they have been turned, comprises a hollow vertical standard 1 formed with vertical guides 2 on which reciprocates a slide 3 carrying the work-table 4 and with horizontal longitudinal guides 5 on which reciprocates a slide 6 carrying transverse slides 7, 8, on which the cutter-spindles 21 are mounted. The work-table.is mounted on trunnions 12 on the slide 3 and carries a frame 19, to which a pattern last 116 and right and left work lasts 117, 118 are secured by pivoted chuck blocks 121 and clamping-plates 132, 131. The table is rotated so as to present either the toes or the heels of the lasts to the cutters by a hand-wheel 13 and can be held in either of the cutting positions or in a horizontal position for the removal of the work by a spring pin 27 controlled by a lever 26. The slide 3 and the parts carried thereby are nearly counterbalanced by a weight 111 sliding inside the standard 1, the difference in weight being sufficient to allow the slide to descend by gravity. The work-table is raised by means of a lever 81, fulcrumed in a slotted bracket 89 on the standard 1 and connected to the slide 3 at 86, while its downward movement is controlled by an hydraulic device shown in Fig. 9, consisting of a plunger 101 connected to the slide 3 and working in a cylinder 100 which forms part of a tank 105 having a filling- aperture 104 and a drain cock 103. The flow of liquid from the tank 105 to the cylinder 100 is controlled by a non-return valve 99, and by a by-pass valve 93 operated by a lever 96 and normally held closed by a spring 97, but opened, when it is desired to lower the work-table, by pressing a hand-lever 82 on the lifting-lever 81. The hand-lever 82 is connected to the valve-lever 96 by means of a flexible wire connexion 95, and a minute adjustment of the by-pass valve is obtained by means of a lever 83 operating an eccentric 83<a> bearing against the lever 82. The cutting-spindle 21 on the slides 7, 8 are rotated in opposite directions by belts 18 passing over pulleys 19 on a shaft on the slide 6 driven through belt gearing 19 by a motor shaft 80. The belt 19 passes over guidepulleys 106, 107, the pulley 106 being carried by spring links 110 pivoted to the bracket carrying the pulley 107. The slide 7 carries a pattern wheel 11, which is kept in engagement with the pattern last 116, while the machine is cutting, by manipulating a handle 23, the last 117 being thus cut to the same foot as the pattern. The slide 8 moves so that its cutter cuts the last 118 to the opposite foot to the pattern last by securing its under surface by a screw 41 to one side of a metal band 35 passing over two pulleys 36 on the slide 6, the slide 7 being connected to the other side of the metal band by screws 40. The slide 7 is connected by a lever 31 and links 33, 32 to a slide 30 working in the slide 6. The slide 30 has a depending stem 48, Fig. 4, formed with a ball end 48<a> fitting in the end of a wobbling spring tube 70 having a dished lower end 69<a> mounted in a cup bearing 71 on a transverse plate 71<a> in the standard 1, the tube always tending to become vertical thereby causing all the slides to resist displacement from their normal positions. The stem 48 is normally engaged by a notch in a curved link 49, which is pivoted to a toothed wheel 50 mounted between the guides 5 and tends to assume a central position against a stop 133 by the influence of a spring 75. The wheel 50 is rotated by the motor 80 through toothed gearing 79, belt gearing 58<a>, variable friction gearing 59, 56, bevel gearing 53, 54, and a pinion 51. The rotation of the wheel 50 causes the stem 48 to rotate if displaced from its normal position, and this effects a corresponding rotation of the cutters about the work. The friction gearing 59, 56 is put into action by means of a foot-lever 65 acting through a cable connexion 64, a bell-crank lever 62, and a connecting-link 61, and may be adjusted to quicken the speed of rotation of the cutters round the work as they reach the toes by shifting a hand-lever 24 engaging a pin 146 on a hanger 57 carrying the friction wheel 59. The stem 48 may be disengaged, when required, from the link 49 by lowering a sliding collar 47 connected by links 46 to an operating crank-handle 42.