Patent GB-1008502-A (GB)
Title: Profile, edge and rabbet grinding machine
IPC: B24B7/12
Filed: 1962-04-27
Abstract: 1,008,502. Grinding. K. HEESEMANN. April 27, 1962 [April 29, 1961; Oct. 28, 1961], No. 16191/62. Heading B3D.  A band grinding machine for profile, edge and rabbet grinding comprises a frame, a work table mounted on the frame for supporting the workpiece and at least one grinding unit which is vertically and horizontally adjustable, the grinding unit comprising an endless abrasive band mounted for longitudinal movement, driving and grinding means for the band and a pressure device for bringing the band into grinding engagement with the workpiece at one or more points along its length, a conveyer on the table for conveying workpieces along the table past the point or points on the band, an axle disposed parallel to the path of the movement of the workpieces, the grinding unit being rotatably mounted as a whole on the axle, and means for vertically and horizontally adjusting the position of the axle with respect to the table. A work table 2 fixed on a frame 1 has a conveyer belt 3 driven by a variable speed motor. The workpiece 4 is pressed against the conveyer belt by rubber-covered pressure rollers 5 resiliently mounted for vertical movement. The rollers 5 are arranged on a beam 24 so as to be adjustable in height and horizontally; the beam 24 is fitted on horizontal arms 25 vertically adjustable jointly or individually on posts 26 rigidly connected to the frame 1. An abutment rail 6 on the work table 2 guides the workpiece. An endless abrasive band 7 runs over a pulley 9 driven by a motor 8 and a pulley 11 adjustable by a band tightener 10. The driving and tightening means are mounted on a carrier axle 12 adjustable about its axis, by a worm gear 15 with hand wheel 16, in carriages 13. The latter are horizontally adjustable, by a spindle 18 with hand wheel 19, on guide rods 17 fixed in a carriage 20 which is vertically adjustable, by a spindle 22 with hand wheel 23, on guides 21 fixed in the frame 1. The parts are adjusted so that the undeformed abrasive band 7 runs parallel to the surface to be ground on the workpiece. The band is pressed into engagement with the workpiece by pressure piece 65. For grinding profiled workpieces the undeformed band lies substantially parallel to the tangent to the profile; the band is pressed against the profile by a profiled tool. In a modification, a work table 32 fixed on a frame 31 has a conveyer belt 33 driven by a variable speed motor. The workpiece 34 is pressed against the conveyer belt by rubbercovered pressure rollers 35 resiliently mounted for vertical movement. The rollers 35 are arranged on a beam 53 so as to be adjustable in height and horizontally. An abutment rail 36 guides the workpiece. An endless abrasive band 37 runs over a motor-driven pulley 38 and a pulley 40 adjusted by a band tightener 39. The driving and tightening means are mounted on a carrier on a carrier axle 41 adjustable about its axis, by a worm gear 44 with hand wheel 45, in carriages 42. The latter are horizontally adjustable, by a spindle 47 with hand wheel 48, on guide rods 46 fixed in a carriage 49 which is vertically adjustable, by a spindle 51 with hand wheel 52, on guides 50 fixed in the frame 31. An endless abrasive band 54 runs over a pulley 56 driven by a motor 57 and over pulleys 55, 55. The pulleys and motor are mounted in a carriage 58 vertically adjustable, by a spindle 60, on guides 59 fixed on a carriage 61 horizontally adjustable, by a spindle 63 with hand wheel 64, on guides 62 mounted at one end in the frame 31 and at the other end in an auxiliary frame 75. Pressure shoes 65a, 65b for pressing the abrasive bands 37, 54 against the workpiece are mounted by guide rods 66 on balls in guides 67 forming part of the assembly swingable about the axle 41 so as to be easily axially adjustable. Cross-members 68 are rigidly connected to the guide rods, and set screws 69 adjustably limit the range of movement of the pressure shoes 65a, 65b. Arranged on the guides 67 are arms 70 on which levers 72 are pivoted for movement in the vertical plane. The levers carry adjustable weights 74 and are connected to the cross-members 68 by pieces 73. Spring-loaded rollers 76, 77 mounted in housings 76a, 77a are adjustable axially of the beam 53 on guides 78, 79. The rollers operate limit switches 81, 80 connected in series so that a control circuit is made when both rollers are in lowered position, i.e. when no workpiece is passing thereunder. With the circuit made coils are energized actuating control valves so that compressed air acts on diaphragms and push rods 87 to withdraw the pressure shoes 65a, 65b from the abrasive bands 37, 54. When a workpiece is present the circuit is broken and the pressure shoes 65a, 65b are urged against the abrasive bands 37, 54 by the weights 74.