Patent GB-676422-A (GB)
Title: Improvements in or relating to automatic feeding device
IPC: B24B5/38
Filed: 1948-10-12
Abstract: 676,422. Feeding rods from hoppers. STEVENS. A. H. (Crucible Steel Co. of America). Oct. 12, 1948. No. 26534/48. Class 78 (i). [Also in Group XXIII] Apparatus for abrading elongated sections of stock includes : an abrading machine, means for urging the sections successively into operative engagement with said machine, a movable abrasive member and means for moving said member, wherein a roller is disposed adjacent said member, and co-operating therewith and having its axis of rotation disposed at an angle relative to the direction of motion of said abrasive member at the position of abrasion and wherein a space is formed between said member and said roller, and means is provided for holding a a plurality of said sections in stacked relationship, said means including a stationary guide for holding the sections one at a time in the discharge position in alignment with said space between said abrasive member and roller and in alignment with said means for urging the sections successively into abrasive engagement with said abrasive member and roller. Fig. 1. General. Rods are fed by gravity down shoot 39 into a channel formed in 'barrel' 40 whence they are discharged to the left one by one by reciprocating piston 54 Fig. 2, (not shown) and are abraded between belt 23 and roller 28 of the centreless grinder 20. The piston 54 is driven by compressed air which enters through valve 59 and passes through safety valve 60, regulating valve 61 to regulate the air pressure read at 62, and through valve lubricating means 63, to control valve 57. The latter works in conjunction with bleeder valves 79 and 80 operated by reciprocating ball 107 fixed on piston rod 54a so that it delivers pulsating air currents along pipes 69 and 70 through speed control valves 95 and 106 respectively to the ends of piston 54 and thus causes the latter to reciprocate. Figs. 3 and 4. Shoot 39 is formed of a fixed part 39b and a movable part 39a pivoted thereto at 41 and supported by support 42 pivoted at 43. Side guides 51 and 52 beneath which the rods roll downwards have movable extensions 51a and 52a pivoted thereto at 51b and 52b, so that, when the part 39a is pivoted downwards by dropping support 42 so as to permit a fresh supply of rods, and when the extensions 51a and 52a are pivoted upwards (by handle 53), the lugs 51c and 52c on the said extensions move downwards to check the rods and to release them when the extensions 51a and 52a and the shoot part 39a have been brought back to their original positions. Additional guides 44 and 45 prevent the rods falling off the sides. Discharge barrel 40 has arcuate aperture into which the rods in turn fall and is supported fixedly to the bottom of the shoot and in. the part 50 of the reciprocating piston 54. Figs. 6 and 7. Control valve 57. This valve has a fixed case 71, fixed inset 72 and movable piston rod 66 carrying pistons 64 and 65. Compressed air enters at 58 and passes through 74, 76 and 73 and through conduit 69 to the reciprocating piston 54 and exhausted air from the piston 54 passes through conduits 70 and 75 and 72b to the exhaust 71b, and at the same time the compressed air passes through 78 and pushes piston 65 to the left due to bleeder valve (not shown) in conduit 82 opening. In this position the compressed air passes from conduit 58 through 74 and 75 to conduit 70 whilst exhausted air is led from conduit 69 through 73 and 72a to exhaust 71b. At the same time the bleeder valve in conduit 81 opens and compressed air from 58 passes through 77 and pushes piston 64 to the right. The piston therefore reciprocates, and delivers compressed air from pipe 58 alternately to pipes 69 and 70. Fig. 8. Bleeder valves 79 or 80. Piston rod 88 carries pistons 87a and 87b and actuating ball 91, the piston moving against spring 89 so that whenever ball 91 is depressed (by reciprocating ball 107. Fig. 1) the two parts of pipe 81 are connected and pipe 81 (or 82) from the control valve is bled. Fig. 9. Speed control valve 95. The two parts of pipe 69 are connected by orifice 100 controlled by screw-operated needle valve 101 and by orifice 104 controlled by resilient ball 103 so that the flow of compressed air to the left can be varied to vary the speed of movement of reciprocating piston 54 whilst the back flow of exhaust to the right cannot be varied. The valves may be electrically operated instead of pneumatically operated.