Patent GB-167196-A (GB)
Title: Improvements in and relating to weighing scales
IPC: B65B1/32
Filed: 1919-07-18
Abstract: 167,196. Wolter, R. July 18, 1919. Automatic-feed weighers. - The scale-pan carrying-beam is detachably connected with the weigh-beam, a detaching link being provided for releasing the scale-pan carrying-beam from the weigh-beam upon the beams tilting so that the scale-pan beam falls quickly and cuts off the supply of material to be weighed. Figs. 1 and 2 show a side and front view of the detachable link, Fig. 3 a section upon the line C, C, D, D Fig. 4, and Fig. 4 a plan upon the line E, E, Fig. 3. Fig. 5 shows a complete machine to which the detachable link is fitted, the machine also illustrating automatic closure of the feed gate and of the discharge gates. The detachable link 1 carries upon the knife-edges 2 the end of the scale-pan beam 3 which is centred upon knifeedges 19 the bearing surrounding and carrying the container 18. The link traverses the guide 5 secured to an upright extension of the beam 3 and at its upper end rests upon the roller 15 which, carried on rollers, is supported by knifeedges 11 upon the weigh-beam 23, the weighbeam resting on knife-edges 10. The link replaces the usual coupling link of the ordinary compound-lever system and is capable of oscillatory movement within the guide 5. The material to be weighed, such as sugar, rice, and wheat, is fed through the middle of the frame of the weigh-beam 23 from the hopper 27 which is independent of the frame. The beam tilting downwards towards the left, the system is balanced. An excess of material brings the screw 8 of the upward extension of the beam 3 into contact with the link and causes the hooked end of the link to ride over the roller 15 and to become disengaged and with it the beam 3 which therefore rocks on its main knife-edges 20. In so doing, it carries with it the lateral arm 33 and its roller 32 which bearing upon a cam closes the feed-gate 28. The container 18 is discharged by hand or automatically through gates 34 mounted on axles 35 which are turned by arms 36. As the container descends, the arms strike detents 37 secured to the main housing and open the gates. On the container being emptied, it rises to its original position the gate closing by springs. The top of the hooked end of the link 1 strikes the underside of the roller 15 and is deflected to the left against the action of the spring 6 until, being above the roller, the hooked end returns to its resting position on the roller. At the same time, the lateral arm 33 will serve to open the feed gate for repetition of the operation. To secure the descent of the scale beam and thereby to prevent the escape of material from the hopper, the cam is provided with the extension 45 so that the roller 32 continues in engagement with it until the scale-beam has completed its descent. A recorder 42 may be fitted. As regards the construction of the bearing which carries the roller 15, the brackets 9 which extend from the beam 23 are formed with fixed knife-edges 11 upon which oscillate the plates 12 carrying the U-shaped member 13. The member is provided with balls 16 which support the ends of the roller 15, the axis of the roller being in alignment with the knife-edges 11, a small counterweight 17 is provided.