Patent GB-178697-A (GB)
Title: Improvements in grinding and mixing machines
IPC: B01F7/16
Filed: 1921-03-29
Abstract: 178,697. Hartshorn, W. N. March 29, 1921. Stationary batch-mixers with rotary stirrers. - A grinding and mixing machine especially applicable for treating chocolate, and of the kind in which a reducing-member is rotated within a container, is provided with means for continuing the circular movement of the materials, produced by the rotation of the reducing-member, along the side walls of the container, and means spaced from the side walls for interrupting the circular movement of the materials set up by the rotating reducing- member. The segments 30, Figs. 1 and 4, of the rotary grinding-member, which coacts with a grinding surface carried by the bottom of the jacketed receptacle 9, are carried by the radial arms 28 of a spider secured to the lower end of a shaft 20 driven by bevel-gearing 24, 25 from a driving-shaft 17, which is mounted in bearings 16 at the upper ends of the legs 14 of an H-shaped yoke member secured to the top of the receptacle. The segments 30 are loosely secured between the arms 28 which are formed with transverse lug members 29 at their outer ends and the material that has passed beneath the segments 30 is directed upwardly by the downwardly-directed leading-edges of the lugs 29, and is then deflected inwardly towards the centre of the receptacle by knives 34, Fig. 4, secured to uprights 35 carried by the arms 28. The leading edges of the blades 34 preferably engage the sides of the receptacle. The. inwardly-deflected material is conveyed downwardly to the space between the segments 30 by two opposite radially-extending agitating- paddles 37, 38 secured to the lower end of a sleeve 36 loose on the shaft 20. Each paddle consists of an inner securing-arm 39 from which extend radial horizontal vanes 40, the outer ends of which are connected by vertical vanes 41. The vanes 40 are inclined upwardly in the normal direction of rotation and arranged in staggered relation, and the leading edges of the vanes 41 are farther from the centre of the receptacle than the trailing edges. Normally, the paddles are rotated in the opposite direction to the grinding- member, but they can be disconnected from their driving-means and either partially or completely held from rotation, or they may be released to revolve freely with the mass. A shaft 48, Figs. 2 and 3, mounted in bearings 45, 46 carried by the sleeve 36 and beam 15 respectively carries a wheel 49 gearing with a wheel 50 which can be locked to the shaft 20 by means of a clutch 53. A wheel 59 on the 36 gears with a wheel 58 on a shaft 56 which carries a wheel 57 gearing with the wheel 40. The clutch 53 is actuated bv lever 60 carried by a shaft 61, the inner end of which forms one trunnion of a yoke member 63, the ends 66 of which are bifurcated to receive bearing-blocks in which are journaled the pins 68 of a collar 69 rotatably secured in an annular groove 50 in the member 53. Brake mechanism consisting of a wheel 72 on the shaft 48 engageable by a brake band 73 is operated by the clutchcontrol lever 60. One end of the baud 73 is secured to an adjusting-bolt 74, and the outer end is pivoted to a lever 77 pivoted to a bracket. The outer end of the lever 77 is pivoted to a rod 81 in turn pivoted to the trunnion 64 of the yoke member 63. In one position of the lever 60, the clutch locks the wheel 50 to the shaft 20 with the brake off; in another, the clutch is disengaged from 'the wheel 50 wich the brake off, and in the third position, the clutch is disengaged from the wheel 50 and the brake on. The discharge spout 88, Fig. 4, preferably at the bottom of the container, is normally closed by a door 89 carried by a lever 90 pivoted to a bracket 92 secured to the casing 6. The outer end of the lever engages behind a locking-projection 93 carried by the bracket 92, and the door 89 is held firmly against the mouth of the outlet by an adjusting-screw 94. The grinding-surface of each segment 30 is preferably formed with large grooves reduced at their outer ends, and the sides of the grooves oposite the direction of rotation are preferably inclined rearwardly.