Patent GB-1011519-A (GB)
Title: Tandem head profiler
IPC: B23Q35/10
Filed: 1964-10-28
Abstract: 1,011,519. Woodworking. ONSRUD MACHINE WORKS Inc. Oct. 28, 1964 [Nov. 15, 1963], No. 43987/64. Heading B5L. A profiling machine comprises a work-table 14 mounted for horizontal reciprocation past a stationary cutter unit 12 and adapted to carry a profile pattern 84 and a workpiece 80, first and second cutter carriages 27, 29 in the cutter unit each mounted for horizontal reciprocation towards and away from the work-table, reversible means for each carriage operable to urge the carriages resiliently toward the worktable, a vertical axis motor driven spindle on each carriage and a cutter 44, 77 on each spindle, a pattern follower 43, 78 on each carriage coaxial with the respective spindle, means 21 for driving the table through a forward stroke past the cutter unit and automatically returning the table to its starting position, and a pattern 84 on the worktable engageable endwise by the followers for positioning the cutters individually relative to the profile of the pattern when the carriages are urged towards the work-table by the reversing means. The work-table 14 is slidable longitudinally on a frame 10 supported on pedestals 11, 12, 13 and has a flat portion 15 on which are a plurality of clamps 16 for securing the pattern 84. A bridge 17 is supported by uprights 18, 19 mounted on the table and has a plurality of vertically adjustable clamps 20 for the workpiece 80. The table 14 is movable past the cutter unit 12 and back to its initial position by a hydraulic piston-and-cylinder device under the control of a valve 22 which is automatically operated to effect the forward and return stroke of the table by a pneumatically operated cylinder 23 in an electrically controlled pneumatic circuit. The valve is also actuated by a lever 25 having a follower engaging a cam 24 on the work-table to control the speed of the table. The cutter unit is mounted on the pedestal 12 and has a pair of horizontal rods 31 for slidably supporting the carriage 30 of the cutter device 27 which has a vertically disposed motor 34 mounted on a slide 35 which, in turn, is adjustable along vertical guideways in the carriage 30 by a screw 38. The motor is coupled to a spindle 40 which has its upper end supported by an arbor 41 and carries a cutter 44 and a freelyrotatable follower 43. The carriage 30 is movable towards and away from the work-table 14 by a pneumatic motor 50 having a rod 51 formed with a head 53 abutting a spring which urges a bracket 52 secured to the carriage against a collar 55 secured to the rod. The cutting device 29 is also mounted on the pedestal 12 and has a carriage 30<SP>1</SP> movable towards and away from the work-table in a similar manner to the carriage 30 by the rod 51<SP>1</SP> of a second pneumatic motor. A base member 60 is vertically adjustable by means of a screw 62 in guideways 61 on the carriage 30<SP>1</SP> and supports a column 69 carrying a housing 68 which has a pair of vertical guide rods 66 for slidably supporting a motor 64 having a spindle on which is a cutter 77. The weight of the motor 64 is counterbalanced by a pneumatic cylinder in the housing 68, and a second pneumatic cylinder is provided for raising and lowering the motor and is controlled by a valve 81 actuated by a button 82 which co-operates with a cam or rail 83 projecting below the pattern 84. A shoe 76 is vertically adjustable on the motor 64, the cutter extending below the shoe, and a follower roller 78 coaxial with the cutter 77 is mounted on the base 60. In Fig. 7 (not shown), both cutters may rotate in the same direction, the first cutter effecting a rough shaping of the workpiece under the control of the pattern 91, and the second cutter effecting a final shaping, or alternatively, the cutters may rotate in opposite directions, the motor 64 being reversible. The pattern may be formed with two levels 84, 84<SP>1</SP> and each follower engages a respective level to control its associated cutter. The first cutter may thus be a face contour cutter and the second a grooving cutter, the level of the pattern controlling the second cutter being masked at various parts so that only predetermined parts of the workpiece are grooved. In Fig. 10 (not shown) the first cutter may be used to shape the edge of the workpiece under the control of the level 84<SP>1</SP> of the pattern which is engaged by the follower 44, the second cutter 77 is controlled horizontally by the follower 28 engaging the lower level 84 of the pattern, and the raising and lowering of the second cutter is controlled by the cam rail 83 engaging the button 82 of the valve 81 controlling the motor for raising and lowering the motor 64. The followers 43 and 78 are resiliently urged against the pattern by the springs on the rods 51, 511 of the pneumatic motors 50 during the forward feed of the table which is automatically reversed at the end of its stroke to return the machined workpiece to its initial loading and unloading position, the motor 64 being raised and the motors 50 operated at the end of the forward stroke to retract the cutters and followers from the workpiece and pattern. Blocks 96, Fig. 1, may be mounted at each end of the workpiece and pattern to assist the smooth engagement of the cutters and followers with the workpiece and pattern.