Patent GB-989785-A (GB)
Title: A device for helical edgewise winding of a strip onto a rotating tube
IPC: B21C37/26
Filed: 1961-07-05
Abstract: 989,785. Making finned tubes; angular bending; coiling strips on tubes. G. RASMUSSEN. July 5, 1961 [July 5, 1960], No. 24211/61. Headings B3A and B3E. A device for helically winding a strip of a rectangular L- or U-shaped cross-section on to a rotating tube the axial feed rate of which is equal to the winding pitch of the strip comprises at least one strip guide roller having an annular recess corresponding to the section of the strip formed by the pulling of the strip through a forming device to guide and keep the strip in contact with the tube, in which the roller is axially and radially adjustable about the tube axis and is rotatable and lockable about an axis vertical to the intersection of the tube and the strip supply roller axes to correspond with the pitch angle of the strip. A winding device comprises a frame 7 to which is attached a tool carrier 6 on which are mounted three equispaced frictionally driven strip guide rollers 8, 9, 10, a known guiding device 11 and a known tube feeding arrangement. The rollers 8, 9, 10 are axially and radially adjustable by means of screws 12, 13 and rotatable and lockable about a vertical axis by a screw arrangement 14. The periphery of the rollers may be knurled or milled. In a modification the following device is described. A series of equi-spaced strip guide rollers 29, 30, 31 supported on holders 41 are driven via telescopic universal joint shafts 28 by a motor driven worm gear 21 and a gear train 22, 24, 25 to feed the strip and at the same time rotate and advance the tube. The gears 22, 24 are mounted on a hollow shaft 23 and the gear 25 on a journalled shaft 27. A tool head carrier 34 comprises a plate 37 to which is attached a disc 38 having radial guide openings 39 and a passage for a tube 1. The strip roller 29 is supported on a holder 41 attached to a shaft 42 rotatable in a bush 43 which is secured to a carriage 47 slidably mounted on a guide 46 and adjustable by means of screws 48. A spigot portion 44 permits axial adjustment of the roller 29 by means of a screw 45. The strip rollers 30, 31 are similarly mounted on an integral carriage 47 without any adjusting device 48, the axial positioning of the rollers is made by rotating an adjusting shaft 51 through the gearing 50, the shafts 67, 59 being coupled to the shaft 45 of the rollers 30, 31 by jointed shafts 68, 69. Due to the gearing ratio the roller 31 moves twice the axial distance of the roller 30. A setting indicator 61 comprises a nut 63, an angle 66, a guide 64 and a dial 65, rotation of the shaft 51 moves the nut along the dial 65 to indicate the degree of axial movement. Each strip roller radial adjustment assembly comprises a pivoted roller 78 attached to the flange 70 of the support 40 which engages in a curved groove 77 of a disc cam 76 guided between the flange 70 and guided and retained within an adjusting ring 71. Rotation of a shaft 84 through a gear train 82, 83 and a pinion 81 engaging with a number of teeth on the periphery of the cam 76 rotates the cam and simultaneously adjusts the radial position of the three strip roller assemblies via the grooves 77 and the rollers 78. The angular adjustment assemblies of the roller axes comprises an arm 87 connected to the shaft 42 and carrying a guide piece 88 engaging with the lugs 86 attached to the adjusting ring 71 which is retained and guided by the disc cam 76, discs 85 and the disc 38. Rotation of a spindle 90 screwed at one end into a pivotable bearing 93 fixed to the disc 38 rotates the adjusting ring 71 via a pivoted bearing 91 attached to its periphery and causes the lugs 86 to rotate the strip rollers 29, 30, 31 via the linkage 87. Graduations on the periphery of the ring 71 register with a pointer 94 to indicate the degree of coarse adjustment whilst a dial 95 fastened to the spindle 90 indicates the degree of fine adjustment with a graduation on the bearing 91. The rotation of the ring 71 is limited via a stop-pin 96 engaging the stop blocks 97 attached to the disc 38. An L-shaped strip forming device comprises a series of pairs of freely rotatable aligning and feed rollers 101 and profile rollers 102, 103, 104, 105 mounted on a carrier 100 rigidly connected to the machine frame. The rollers 101 are eccentrically journalled to facilitate nip adjustment and the whole slidable within the elongated slots of the frame 100. The rollers 102, 103 rotate about journals 109, 110, an annular groove 111 of the roller 102 engages with an annular rib 112 of the roller 103, the shoulders 113, 114 form a guide for the strip 115 and the edge of the strip is formed up at an angle of 45 degrees. The following rollers 105, 104 having an annular rib 118 and an annular groove 119 complete the L profile. The nip of the rollers is adjustable and they are all driven by the advancing strip. A guide 119, 120 to receive the appropriate strip section supplies the strip to the first strip guiding roller 8 or 29. In a modification a strip is fed through a series of feed and aligning rollers 121, 122, V forming rollers 123, 124, 125, 126 and U forming rollers 129, 127, 128, Figs. 11c, 11d, 11e (not shown), to produce a strip of a U-shaped cross-section and is mounted in a similar manner to the above feed mechanism.