Patent GB-832347-A (GB)
Title: Improvements in or relating to machines suitable for use in mass production processes
Inventor: GARDINER HERBERT WILLIAM BENJA
IPC: B23Q7/04
Filed: 1956-02-23
Abstract: 832,347. Malting electric lamps. GENERAL ELECTRIC CO. Ltd. Feb. 22, 1957 [Feb. 23, 1956], No. 5687/56. Class 39(2) [Also in Groups XVI and XXX] In a machine for use in mass production processes such as the manufacture of incandescent electric lamps and of the kind comprising a main member arranged to travel along a main path and a secondary member arranged to travel along a secondary path which at, at least one working point approaches or coincides with the main path to permit co-operation between parts carried by the main and secondary members, the secondary members travel cyclically along a working path produced in the use of the machine by rotation of the member about an axis whilst the centre of rotation of the member, about the axis is moved continuously around a closed curve in a direction generally perpendicular to the axis. The movement of the centre of rotation and the rotation of the secondary member are so related that the working path has at least one fixed cusp position at which the secondary member is instantaneously travelling at zero velocity and at which position an operation can be effected on or by a part carried by or arranged to be carried by the secondary member, and are so related that the working path has at least one other fixed position at which the secondary member is moving with substantially the same velocity as the main member, at which position co-operation between parts carried by the secondary and main members can be effected. Figs. 1 and 2 show diagrammatically a machine arrangement comprising a continuously moving main conveyer 1 consisting of an endless chain 2 carried between two sprockets 3 which rotate about vertical axes, a number of supports or carriers 4 for articles being spaced equally along the chain. The mechanism of the transfer device located adjacent to the main conveyer comprises a fixed gear wheel 5 secured on a vertical spindle 6 mounted in a support 7, with a gear wheel 8 of a diameter four times that of the fixed gear 5 rotatable about the spindle 6, below the gear 5, and carrying a bearing 9 supporting the lower end of a spindle 10 on which is secured a planet gear 11 having the same diameter as the fixed wheel 5 upon which it is arranged to rotate. Above the wheel 11 the shaft 10 passes through a bearing 12 in a radius arm 13 arranged to rotate with the wheel 8 about the spindle 6. When the larger wheel 8 and the radius arm 13 are rotated, the gear wheel 11 in engagement with fixed wheel 5 rotates about its own axis and makes one such revolution in a complete rotation of wheel 8, so that any point in the pitch line of gear wheel 11 will follow an epicyclic path of the form indicated in broken lines in Fig. 1. At the upper end of the shaft 10 is secured an arm 15 carrying a secondary member 16 which is rotated with the planet wheel, so that its outer end also follows the epicyclic path 14 wherein a position 17 of instantaneous zero velocity is opposite a position 18 of maximum velocity. -In' the example the secondary member 16 comprises a pair of jaws 19 into which an article, e.g. an inverted lamp bulb is placed at the position 17 and released upon a lamp stem or pinch carried in a work holder 4 of the mainconveyer when brought above the latter at position 18. The transfer arrangement is so arranged that the instantaneous speed of the planet wheel 11 at position 18 is the same as that of the adjacent part of the chain conveyer 2 and in the same direction. This may be effected by a gear wheel 20 which engages the gear 8 and is driven by a chain 21 and sprockets 22, 22<SP>1</SP> from a main driving sprocket 3. The jaws may be arranged to close automatically on to an article fed into it at the position of instantaneous zero velocity and to open at the position of maximum velocity to allow the article to drop on to the conveyer support 4 at the position 18, e.g. by means of a system of cams co-operating with the arm 15 as it is rotated. Additional secondary members may be employed for carrying out particular operations on components before they are removed from the main conveyer, and one such member may comprise a pad for stamping a number or design on a lamp bulb, a quantity of ink or the like being applied to the pad at a position of instantaneous zero velocity. In a modification, Fig. 4, the main conveyer consists of a continuously rotating circular turret or table 43 carrying a plurality of work holders 44, and the transfer arrangement comprises a fixed gear wheel 5, Fig. 3, mounted on a vertical shaft 25 extending upwardly from a supporting base 26 and carrying a hollow frame 28 supported thereon by top and bottom bearings 27, the frame 28 providing a mounting-support for six vertical shafts 29 spaced uniformly around in bearings 30 adjacent to its periphery. Each shaft 29 has secured to it a gear wheel 31 of the same diameter as the fixed gear wheel 5 and connected to the latter through a pair of idler gears 32, Fig. 5 (not shown), each pair of idler gears being common to an adjacent pair of rotatable gears 31. The arrangement is such that each time the support 28 is rotated once about the fixed gear wheel 5 each of the gear wheels 31 and the shaft 29 associated with it make one revolution about their common axis. A pair of gripper jaws at the upper end of each shaft 29 comprises a jaw 33 secured to a boss 34 on the shaft and extending through a slot in a sleeve 36 which surrounds the shaft, the co-operating jaw 35 being secured to the upper end of the sleeve 36 and extending radially therefrom. The jaws are biased to the closed position by a tensioned helical spring 39 located within a gap between the top of the sleeve 36 and a metal cap 37 secured to the top of the shaft 29, one end of the spring being engaged by a pin on the underside of the cap and the other end engaged by a similar pin at the top of the sleeve. The jaws are shaped to hold in the vertical position the exhaust tube of an electric incandescent lamp and they also extend for such a distance from the shaft 29 that as the support 28 rotates in the direction of the arrow 59, Fig. 4, the parts which grip the exhaust tube follow the epicyclic path 60. The jaws are closed upon, and thus pick-up, an exhaust tube 42 fed by any desired means into a V- shaped recess 53, Fig. 4, at a position at which the jaws have an instantaneous zero velocity, and the exhaust tube is carried around until it reaches the transfer position where it is travelling instantaneously at the same speed as the work holder 44 carrying a lamp stem 62 on the turret 43, whereat the jaws are opened and the exhaust tube falls, and is guided into the lamp stem. Automatic opening and closing of the jaws 33, 35 of the transfer device is effected by providing the lower end of each sleeve 36 with a radial arm 46 carrying a roller 47 arranged to engage cam plates 48, 49 at the loading and unloading positions, whereby the sleeve is rotated about the shaft 29 against the bias of the spring 39.