Patent GB-1086833-A (GB)
Title: Improved cutting apparatus with pendular movement
IPC: B23D45/18
Filed: 1965-04-28
Abstract: 1,086,833. Sawing. VALLOUREC. April 28, 1965 [April 28, 1964], No. 17942/65. Heading B5L. Apparatus for cutting tubes or similar products into lengths while they are continuously delivered comprises a circular saw 34, Fig. 2, carried by a pendular device, the inertia of which can be regulated so that the speed of the saw at the bottom of its travel is substantially the same as that of the article to be cut, the article being moved substantially tangentially to the path of travel of the saw at the bottom point of the path. The saw 34 is driven by a motor 33 mounted on a plate 32 connected by parallel links 28, 29 to two shafts 27, 28 mounted in bearings in a frame 4a. The shaft 26 is connected by a coupling 8, Fig. 1, to a shaft 5 having two gears 7a, 7b which are selectively engageable by toothed quadrants 6a, 6b on a shaft 3 having an arm 2 carrying a weight 16. The weight can be retained in an upper position by engagement of a stirrup member 17 with a latch 16 on the weights, the stirrup member being retractable by an electromagnet 24 to release the weight which thereby rotates the shaft 26 to swing the saw in a circular path to cut the material 45. The shaft 26 is connected by a chain drive 38 and gears 41, 42 to an arm 44 which is swung in synchronism with the movement of the saw to support the material as it is being cut by the saw. The shaft 3 is rigidly connected to a sleeve secured to a rectangular frame having sides 9 along which are adjustable weights 10a, 10b, screws 11a 11b engaging the weights being connected by gearing 12a, 12b, 13 and a shaft 14 to a motor 15, operation of which moves the weights along the sides 9 to adjust the inertia of the system. In operation, the weights 10a, 10b are adjusted and one or other of the quadrants 6a, 6b engaged with its respective gear 7a, 7b to adjust the inertia of the system in accordance with the speed of advance of the material to be cut. The electromagnet is then energized to withdraw the stirrup member 17 so that the weight 1 rotates the shaft 3 and, through the gearing, the shaft 26 to effect a pendulum movement to the saw 34, the shaft 26 also effecting movement of the supporting arm 44. The weight 1 and plate 32 carrying the saw are offset so that the saw acts on the material as the weight 1 reaches its lowest point, the saw completing its cut when it reaches its lowest point. The forward thrust of the material 45 during the slowing down ascending movement of the saw is absorbed by an elastic mounting for the saw blade. When the saw reaches its highest point after cutting the material, an electrical contact operates an hydraulic jack 36 to raise the shaft 27 so that during the return swing, the saw is raised from engagement with the material 45. When the weight 1 reaches the end of its return swing, an electrical contact operates an hydraulic jack 23 to move a rack 22 engaging a gear 21 connected to a cam 19 which engages an abutment 18 on the weight to raise the weight sufficiently for the stirrup member 17 to engage the latch 16, a device 25 damping the movement.