Patent GB-594395-A (GB)
Title: Improvements in or relating to means for checking dimensions
IPC: B07C5/36
Filed: 1942-11-27
Abstract: 594,395. Linear - dimension gauges. SIGMA INSTRUMENT CO., Ltd., and LOXHAM, J. Nov. 27, 1942, No. 16896. [Class 106 (ii)] A machine for inspecting dimensions of workpieces W and indicating the results of inspection comprises a bed 1, a number of gauging devices mounted thereon; a work-holder arranged to be displaceable from workpiece receiving to gauging position, the workpiece being engaged simultaneously by all gauging devices, and a set of three signal lamps controlled by each gauging device in the manner described in Specification 555,364, whereby if the dimension being gauged is correct a first signal lamp of the set associated with the device is illuminated, whilst if that dimension is undersize a second lamp of the set is illuminated, whilst if the dimension is oversize a third lamp is illuminated. A vertical bed 2 on the bed 1 has a machined vertical face to which three gauging devices 16, 17, 18 are adjustably secured, the work-holder (not shown) being carried on a slide 64 mounted on a pillar 5 secured to the bed 1. A panel 7 on the bed 2 carries three sets of signal windows 8, 9, 10, and an engraved outline 11 of the workpiece and of the dimensions 12, 13, 15 to be gauged. The electric circuit includes an arrangement for energizing electromagnets to attract levers from contact with the measuring anvils to allow the latter resiliently to engage the workpiece. The three measuring devices are of the type described in Specification 594,450, the devices 16, 17 being vertically and the device 18 being horizontally disposed. In each of the housings of the devices 16, 17 is a bell-crank lever, the short arm of which is pivotally connected with the anvil member of the device, the longer arm co-operating with a pair of adjustable electric contacts in the corresponding lamp circuit. Each device 16, 17 is mounted on an arrangement of slide blocks which can be adjusted vertically and horizontally relatively to the vertical bed 2 by screw adjustment means 25, 27, 31A, the means 25 constituting a fine vertical adjustment arranged on the device itself. The slide blocks are all clamped together and to the bed 2 by one bolt with. which is associated a spring to ensure minimum clamping-pressure. The horizontal device 18 is similar to the devices 16, 17 except-that it can only be adjusted horizontally relatively to the bed 2 by the screw 44 and the adjustment means 25. The devices 16, 17 have spring-pressed anvils 19, 20; the device 18 has a similar member 46 which co-operates with a free anvil 47 carried on a slide block in guide members rigidly supported on the main block carrying the device 18. A fourth anvil 52 is rigidly secured to an adjustable slide 53. The anvils 52, 19 gauge one end of the workpiece, and the anvils 20, 47 the other ; the longitudinal distance 15 between the shoulders of the workpiece is callipered between anvils 52, 47. The workpiece holder slide 64 moves on rollers 65 in guides 62, 63 to carry.a workpiece to the gauging position on depression of a horizontal rod 66 (not shown), a member secured to the rod first closing the circuit of the electromagnets which release the anvils 19, 20, 47, and secondly closing the lamp circuits. A bracket and a flat plate mounted on blade springs mounted on the holder serve to retain the workpiece on the holder until the gauging position is reached, when a stop element moves the flat plate backwardly to release the workpiece.