| 摘要 |
<p>836,309. Severing glass tubing. CORNING GLASS WORKS. April 25, 1958, [May 2, 1957], No. 13227/58. Class 56. In the severing of workpieces from a moving body of glass tubing moving at a uniform speed, an abrasive device is rotated about an axis normal to the path of travel of the tubing at a circumferential speed equal to the linear speed of the tubing with which it comes periodically into tangential engagement, the, device then being moved transversely of the tubing to sever it. The severing device is carried by a hub 21 fixed through a plate 14 slidably suspended between uprights 12, 13, on a base 11, from a screw 15 freely rotatable in a hanger 16 and threaded through a hub 17 integral with a member 18 bridging the uprights 12, 13. A tubular shaft 23 is mounted in bearings 24 in hub 21 and rotated from a variable speed transmission system through a belt 68 and pulley 65 for varying the circumferential speed of the abrasive device 60. A support 25 keyed to shaft 23 has rods 26 sliding therethrough bridged by a bar 28 above and a block member 29 below to which is secured a housing 30, springs 31 between support 25 and block 29 pressing downwardly. A chain 33 is secured to block 29 and passes round sprocket 35 on support 25, through shaft 23 and over an idler sprocket 36 carried on a lever 37 pivoted at 38 to a bracket 40 on hanger 16 to be adjustably secured to the transverse member 18, a swivel 39 in shaft 23 allowing rotation of the chain 33 to the left thereof. Lifting or lowering of hub 21 and shaft 23 by rotation of screw 15 lengthens or shortens the amount of chain 33 between support 25 and block 29 to vary the radial distance of the abrasive device 60 from the shaft 23 around which it rotates. The device 60 is mounted on an arm 50 pivoted in a slotted sleeve 49 and pressed downwardly by a spring 55 between arm 50 and a bracket 52, the sleeve 49 being pinned to a rod 46 sliding through housing 30, and having a roller 47 engaging a cam 48 for moving the abrasive device 60 across the tubing 61, the rod 46 being returned by a spring 34 in housing 30 pressing against a guide block 32 which prevents turning of the rod. The tubing 61, which is fed under the device 60 from the drawing apparatus, is supported immediately below the abrasive member 60 by a wheel 62 carried by a spring supported member 63. To shorten the effective length of chain 33 each alternate revolution, so that length of workpieces may be doubled, a gear 70 on shaft 23 meshes with a gear 71 of twice the diameter, the gear 71 having a cam 72 which swings lever 37 to the right when an eccentrically mounted shaft 73 through lever 37 is turned through 180 degrees to bring roller 74 in the path of cam 72. To positively break the workpiece from the body 61, the member 60 passes a wick fed with water so that the wet member 60 imparts a thermal shock to the hot tubing 61.</p> |
