GB1303978A - - Google Patents

Abstract

1303978 Grinding VICENTINI OFFICINE E FONDERIE DI CAVAZZALE Snc 14 April 1971 9433/71 Heading B3D A method of removing dribbles 5, Fig. 1, of glazing from ceramic articles 3 comprises feeding and positioning the articles in turn beneath a grinding head 1, Fig. 2, having abrasive members, lowering and rotating the head so that the abrasive members remove the dribbles, and removing each article in turn from beneath the head. The articles are placed on a surface 4 and fed by a device 2 to a position beneath the grinding head. After grinding the articles pass through a tunnel 6 to a conveyer 7 and are withdrawn at 9 for inspection and packing. The grinding head consists of a frame 11, 12, Fig. 3, vertically reciprocated on columns 10 by a rod 14 driven by a crank 16. A head 21 is rotatably mounted on the frame and has a gear 20 engaging a gear 19 which is axially displaceable with the hand on a shaft 18 belt driven by an electric motor 17. The head 21 carries a disc 26 supporting four adjustable rods 27, each of which carries an abrasive member comprising an abrasion strip 28 secured to pivots by a spring located within the rod. The head also carries a spindle 22 on the lower end of which is a plate 24 covered with resilient material 25 for clamping the article on the surface 4 when the head is lowered. The feeding device 2 consists of a carriage 35, Fig. 5, reciprocatable along rods 34 by a lever 37 oscillated by a crank 57. The carriage has fingers 41 for advancing an article to be ground to a position beneath the grinding head. A T-shaped member 42 is mounted on the front of the carriage and carries fingers 45 pivotable between positions above and below the supporting surface 4. When the carriage is retracted to the left, a projection 49 on the guide rods 34 moves the fingers 45 to their raised position so that an operator can place an article between the fingers 44, 45. On movement of the carriage to the right, while fingers 44 advance the article to be ground, fingers 45 push the ground article into the tunnel 6. At the end of the movement of the carriage to the right, a further projection on the guide rod 34 causes the fingers 45 to be lowered, and the member 42 acts against a part 50 to cause fingers 53 on a pivoted member to be raised so as to act as a stop for the article to be ground. In another embodiment, the grinding head is raised and lowered by a pneumatic system and the carriage is reciprocated by a pneumatic system.