Patent GB-796824-A (GB)
Title: Method and apparatus for banding cylindrical articles
IPC: B65B13/30
Filed: 1955-08-23
Abstract: 796,824. Joining ends of straps and bands DIBBERN, E. P. Oct. 19, 1956 [Aug. 23, 1955], No. 24229/55. Class 109 [Also in Groups VIII and XXII]. A method of affixing a peripheral band to a cylindrical article comprises wrapping the band around the article with its end projecting therefrom in overlapping relationship, spade punching the material from one overlapping end portion through the other end portion and clinching the protruding material to fix the end portions together. Metal bands may be fixed around ceramic tubes on which electrical resistances are to be wound, the resistances being connected to "butterflies" pressed up from the bands and the projecting ends of the bands serving as tags for connection to outside circuits. Metal strip 1 from a reel 21 passes over a roller 22, braked by a weighted band 26, under a roller 23 and along a guide 24 whence it is fed forward by reciprocating gripper means 25 through a guide slot in a block 46. The gripper means 25 comprises a slide 29 having a strip engaging gripper 31 pivoted thereto, and rocked to engage the strip and move the slide 29 forward by a rod 34 pivoted thereto and to a lever 37 rocked about a shaft 38 by a crank disc 40 driven through a one revolution clutch by a motor 42. From the block 46 the strip passes between upper and lower dies 48, 47 which form "butterflies" in the strip, over an anvil 2 and under a punch assembly 8, under a ceramic tube 3 mounted on a mandrel 4, in its raised position, and over a forming blade 6, in its lower position, Fig. 1. Rearward movement of the lever 37 releases the gripper 31, the strip 1 being held stationary by a spring- urged cam 43. The mandrel 4 is lowered so that the strip 1 is bent around the lower half of the ceramic tube 3, Fig. 2, the mandrel 4 being carried by two vertical rods 68 each having a pin 72 projecting therefrom into the path of the transfer pin 73 carried by an arm 74 rigid with the shaft 54. The shaft 54 is rocked by a cam 56 on a rod 58 moved longitudinally by a lever 84 pivoted at 85 to the machine frame and rocked by a hook member 88 pivoted on the lever 37. The hook 88 disengages the lever 84 after a predetermined rearward movement of the lever 37 and a spring 140 returns the cam 56. Rocking of the shaft 54 also. through a lever 53, engaging a pin 52 on rods 50, lowers the dies 48 to punch the "butterflies" in the strip. Immediately after downward movement of mandrel 4 a forming blade 6 is moved about the axis thereof to wrap the projecting end of the strip 1 about a quadrant of the ceramic tube 3, Fig. 3. The forming blade 6 is carried by cranks 94, 95 one of which is rocked by a rack 99 on a rod 100 moved by a hook 61 pivoted to the lever 37 and engaging a pin on a bracket 59 clamped to the bar 100. The hook 61 first slides on the pin 60 while the mandrel 4 is lowered and then engages the pin, being disengaged towards the end of movement of the lever 37 by an abutment 66. The rack 99 is locked to hold the forming blade 6 in its operating position by an abutment 104 on a locking plate 101 upwardly spring urged. The crank disc 40 having made one revolution has the drive thereto disengaged. A shaft 108 is then clutched to the motor 42 and cranks 105 on the shaft lower the rods 115 carrying the punch assembly 8 thus completing the wrapping of the strip 1 around the ceramic tube 3, Fig. 4. A block 12 of the punch assembly grips the'projecting ends of the strip against the anvil 2 and a punch 10 pushes material from the upper end of the strip through the lowermost end of the strip to form in effect a hollow rivet, a punch 9 forming a hole in the lower end of the strip and a cutter 11 at the same time severing the strip. Lowering of the rods 115, lowers the locking plate 101 to allow the rack 99 to return and the forming blade 6 to move to its original position. The block 12 is locked to the anvil 2 by catches 121 pivoted on the anvil and while the tag is thus held the metal upset by the punch 10 is riveted against the lower end of the strip by riveting punch 13 actuated through a lever 128 and a rod 131 by a cam 132 on the shaft 108. On continued upward movement of the punch assembly 8 cams 126 thereon unlock the block 12 from the anvil 2. This allows the mandrel 4 which has been unlocked by cams 80 on the rods 115 during their depression, to rise under the action of springs 70. The mandrel with the ceramic tube 3 thereon is then moved to a position to receive a further strip and the cycle of operations is repeated. During this cycle the band already secured to the tube is tightened thereon by being pressed between the block 12 and the anvil 2. Grooves in an extension of the anvil 4 engaging a spring catch 137 assist positioning of the mandrel. The band may be wrapped around a cylindrical surface on a non- cylindrical article.