Patent GB-390636-A (GB)
Title: An improved machine for guiding burners or electrodes for cutting or welding metals
IPC: B23K7/00
Filed: 1932-03-29
Abstract: 390,636. Uniting and dividing by fusion. SCHMIDT, A., Scheydgasse, Strebersdorf, Vienna. March 29, 1932, No. 8995. [Class 83 (iv).] In a machine for cutting or welding metals by a burner or electrode the longitudinal and transverse movements of the burner &c. or a combination thereof are effected by a driven wheel which is rockable about an axis perpendicular to the wheel axis, and co-operates with the surface of a cylinder so as to rotate the cylinder to effect the transverse movement, and either traverses the cylinder axially or rolls thereon so as to effect the longitudinal movement. The burner 72 is carried by a vertically adjustable spindle in a slide 9, which is movable on a girder 2 provided with wheeled supports 3, 4 traversable on rails 7, 8, and is rotatably connected to a cylinder 10, which can be rotated and traversed by a wheel or pair of wheels 11 rotated by gearing from a motor 34. The wheels 11 are mounted in a control head 12 rotatably adjustable in a casing by a hand-lever 26 co-operating with a scale so as to adjust the angle of the wheel in accordance with the direction of the line of cut drawn on the work. The lever may carry a graduated hand-wheel having a pinion meshing with a circular rack on the casing for fine adjustments. The control head is pressed down by a spring and may be raised from the cylinder by an eccentric 50. In order to provide an unloaded control head which may be retained in its adjusted position without locking, a pair of wheels 11 are used which are driven at the same speed in the same direction by worm gears through staggered worms 22, 23 driven in opposite directions by gears 18, 19 engaging internal teeth 14<1>, 15<1> on a pair of oppositely rotated bevel gears 14, 15. These gears are driven by a bevel pinion 17 on a shaft 16, which may be connected by a clutch 51 to a bevel wheel 49 driven through bevel wheels 48, 47, 45, chain gear 43, spur gear 41, 40, 39, 38, and a friction gear 35, 37 adjustable according to the thickness of the metal to be cut, from a motor 34 carried by the support 3. Rotation of the cylinder 10 by the wheels 11 is communicated to the track wheels by a ring 28 carrying hollow ground spring-pressed rollers 27, the ring being furnished with a sprocket wheel connected by a chain 29 to a sprocket wheel on the spindle of one of the track wheels. The lower sprocket wheel is connected to its spindle by a jam nut 33. The track wheels may be coupled together. In order to effect circular or templet cuts, the wheels 11 are first raised by the eccentric and a clutch lever is operated to disconnect the clutch 51 and to apply a clutch 59 to either of the wheels 47, 48 according to the direction of rotation of the shaft 60 desired. This shaft is carried by a rotatably mounted head 57 and is connected by bevel gear 61, 56 with a flexible shaft 54. For templet cutting the flexible shaft is connected to a head 53 clipped at 52 to the cylinder 10 and slidable on the girder, the head being provided with a pair of driven rolls engaging the flange of a templet secured to a table 63. The table 63 is adjustable on a table 62 adjustable on the rails 7, 8, the tables being secured by clamps 64 in adjusted position. The table 62 may have a scale co-operating with a pointer 65. For circular cutting the flexible shaft is cohnected to a shaft 76, Fig. 7, in a gear-box 69 on the spindle 67 carrying the burner. The burner may be rotatably mounted in a sector 75 angularly adjustable on an angle-piece 71 which is radially adjustable in the head 70 for effecting bevelled circular cuts. The shaft 76 carries a cone 77 connected by friction gear 79, 78, adjustable to suit the diameter of cut, to a shaft which is connected by gears 84, 85 to the loose pinion 86 of a differential gear. The shaft 76 is connected by gear 81, 82 to the differential casing and the gear 88 is secured to a shaft 87 carrying a worm 106 engaging a worm wheel 107 which may be secured by a nut 109 to the spindle 67. The motor 34 may be stopped by a pear switch within reach from all points. In a modification, Fig. 8, the reversing gear 47, 48 is dispensed with, the motor 34 with its gear and the control head 12 being carried by a slide 91 carrying also the burner head, so that the wheels 11 may traverse these parts along the girder 2 by engaging a non-slidable and preferably hollow cylinder 10 mounted in the girder carriage. Rotation of the cylinder is produced by the wheels 11 and effects the transverse movement of the carriage through spur gears 92, 93. In order to effect bevelled cuts the burner 72 is carried by a sector 75 in an arcuate guide 71, whose centre is at the burner nozzle and in alignment with the axis of the spindle 67. The spindle is vertically adjustable by hand-wheels 100 through chains 98 provided with a counterweight 99. The angular position of the spindle 67 when effecting bevelled cuts is adjusted through the control head 12 by a gear 102, Fig. 10, thereon engaging a gear 105 on the spindle through a disengageable gear 104. Circular cutting is effected by a separate motor 101 which drives the spindle through gearing as in the previous form, after first raising the wheels 11, disengaging the gear 104, securing the worm 107 to the spindle by the nut 109 and securing an adjustable burner head on the spindle. In order to cut according to a drawing with the use of the wheels 11, an endless band 112 carrying the drawing is placed round the cylinder 10 and a cylinder 110 carried on a slide 111 attached to the carriage 2 by adjustable tensioning members 114. The slide 91 has a pin 113 for co-operating with the drawing. For templet cutting, a templet 122 secured to the framing co-operates with a roller head 53 engaging between 'rails 125 carried by the girder 2 so as to effect the transverse movement. The head 53 traverses the slide 91 along the girder by an endless cable 127 secured to the head at 126 and to the slide 91 at 130. The head is driven by a flexible shaft 123 from a separate motor 124 on the girder. An operator's platform 115 may be provided driven from a separate motor 116 controlled by a spring-opened switch 118, which is closed by a pawl 117 on the girder carriage when the latter is traversed. The platform has a glass protective screen 120. The motors 34, 101 may be controlled by a switch 132, which has positions so that the motor 101 may be reversed.