Patent GB-1057053-A (GB)
Title: Improvements in workpiece positioning structures
IPC: B21D28/04
Filed: 1964-03-10
Abstract: 1,057,053. Spacing racks and work guides. HOUDAILLE INDUSTRIES Inc. March 10, 1964 [April 5, 1963], No. 10076/64. Heading B3W. [Also in Division B4] A structure for positioning a workpiece in relation to a predetermined reference point 12 comprises a rail 13 secured to the table 11 of a machine, e.g. a punch press, a housing 14 slidable along the rail and carrying a back gauge bar 16 and a further bar 17, which is slidably mounted above and parallel to the bar 16 and which carries adjustable gauging stops 19, 20 which position a side edge of the workpiece.  Construction of the back gauge bar.-The bar 13 has a graduated scale 24 and parallel thereto a row of locating apertures 26 spaced at one inch intervals. These holes are engaged by two pins 49 on a stop member 15 which is locked in place by a thumb screw 50-which enters one of series of tapped holes 27 between the locating apertures 26. An anvil 51 on the stop member 15 engages the stem of a dial indicator 46 mounted on the housing 14. A workpiece support 40 rests on an upwardly directed surface 39, Fig. 2 (not shown) of the housing 14 and the bar 16 rests on this workpiece support and is secured by screws 41. The bar 16 is also secured to the housing 14 by bolts 38. A similar workpiece support 43 is attached to the gauge bar 16 on the opposite side of the reference point 12. The forward edge 44 of the bar 16 constitutes the work engaging surface and there is an aperture 45 in the workpiece support 40 through which the scale 24 can be seen. The position of the gauge bar 16 is given by the sum of the readings of the scale 24 and the dial indicator 46. The housing 14 is locked in position by a clamp screw 33. The upper surface of the workpiece support 40 is co-planar with tooling at the reference point 12. Construction of the side gauging stops.-The bar 17 is supported above the bar 16 by brackets 18 and a further bracket which is combined with the gauging stop 20, which has limited movement along the bar 16 and is clamped to the bar 16 by a bolt 62, Fig. 4 (not shown) which passes through a slot 61. The bar 17 can be locked to the bracket by a screw 68. The bracket 18 comprises a housing 69, Fig. 5 (not shown), which is bolted to the bar 16 and a bracket 71. The bracket 71 comprises a plate, which has a slotted opening 72, and a tubular portion 73 from its left hand end to the point 74. The bracket 71 can be clamped to the bar 17 by a screw 75. The tubular portion 73 is slidably in the housing 69 and is threaded at its right-hand end to receive a collar 76 which can be locked in any desired position. A dial indicator 82 is mounted on the housing 69 and has a stem 83 which engages the bracket 71. The relative positions of the bracket 71 and housing 69 can be varied by a hand screw 79 which engages a quickly releasably half-nut in the housing. One or more gauging stops 19 Fig. 3 (not shown) which each comprise a split clamp 94 and a reversible loose piece 99 are mounted on the bar 17. In the position shown in solid lines in Fig. 3 the edge of the loose piece 99 engages in one of a number of notches 57 formed in the edge of a graduated scale 55 secured to the bar 16. When the loose piece 99 is reversed, to the position shown in dotted lines in Fig. 3 a cam surface 102 causes the piece 99 to lift as a workpiece is pushed towards the gauging surface 44 of the back gauge bar 16. To set each stop 19 the clamp screw 97 is loosened, the clamp 94 is slid along the bar 17 and the loose piece 99 is inserted so that it engages the notch 57 which corresponds to the whole number of inches in the desired dimension. The screw 79 is then rotated so that the dial indicator 82 shows the desired fraction of an inch, the screw 97 is tightened and the loose piece 99 is reversed. By releasing the half-nut in the housing 69 the bracket 71 and the stop bar 17 are then moved to the left by a spring 78. The bracket 20 is also constructed to be used as a gauging stop and may have a gauging extension 106 projecting to the right so that the bracket itself is clear of tooling at the reference point 12.