Patent GB-343470-A (GB)
Title: Improvements in machines for dusting and polishing tinplates and the like
IPC: B24B7/12
Filed: 1929-11-18
Abstract: 343,470. Dusting and polishing tinplates. DAVIES, S., Alexander Engineering Works, Briton Ferry, Glamorgan. Nov. 18, 1929, No. 35231. [Class 82 (ii).] In a machine for dusting and polishing t i n - plates &c. the rotation of one or more pairs of sheep-skin covered preliminary dusting rollers is arrested or retarded as soon as the leading edge of a plate passing between them is engaged by a pair of gripping rollers, covered with indiarubber, which advance the plate for treatment between successive pairs of sheep-skin covered polishing rollers. The rotation of the dusting rollers is resumed as soon as the rear edge of the plate has passed out of their nip. A main driving shaft c<1>, mounted in bearings in the framework a, carries the upper roller c of a pair of rubber-covered gripping rollers c, d the lower roller the bearings of which are adjustable being driven through pinions q, ql. From sprocket wheels on shaft c<1> are driven pairs of polishing, rollers 1, 2, 3, the pair 1 being driven with greater peripheral speed than the gripping rollers c, d and the pair 3 at a less speed than the pair 2. The bearings of the upper rollers of the pairs 1, 2, 3 are slidable in guides and are held apart from the bearings of the lower rollers by helical springs. A friction roller 12 on a shaft 13 mounted in bearings 14 at the forward end of a lever 15 pivoted to the main frame at 4 is driven by chain and sprocket gearing from the shaft c<1>. An auxiliary framework 5 pivoted to the main frame at 4 carries pairs of preliminary dusting rollers 6, 7 with resiliently mounted bearings and a friction roller 8 on shaft 9 which when the framework is in its normal position coacts with the driven friction roller 12. The upper rollers of the pair 7 are driven by chain and sprocket gearing from the shaft 9 the upper and lower rollers of this pair being geared together by pinions and the two lower and the two upper rollers of the pairs 6, 7 being connected by chain and sprocket gearing. A pile of plates to be treated is placed on a table 47 pivoted at its rear end between side members 48 in which a longitudinal angle-iron 51 can be held in any suitable position by bolts 50 fitting in holes 49. The angle-iron 51 carries springs 52 the upper ends of which bear on the underside of the table 47, adjustment of the angle-iron 51 enabling the table and the plates to be maintained at the desired level. Alternatively a system of weighted levers may be employed to raise the table 47. The plates are fed to the preliminary dusting rollers 6 by rollers 43 mounted on a shaft 42 carried by a framework 40 pivoted on a shaft 37 mounted in bearings in standards 36. The shaft 37 is driven by chain and sprocket gearing from the shaft of the friction roller 12 and drives the shaft 42 through sprocket wheels 39, 44. The pressure of the rollers 43 on the pile of plates is regulated by weights 45 on the rear end of the framework 40. The plate is passed through the rollers 6, 7, and when gripped by the rollers c, d the auxiliary framework 5 tilts about its pivot 4, the friction roller 8 no longer makes contact with the driven friction roller 12 and the driving of the preliminary rollers 6, 7 is consequently interrupted until the plate leaves the rollers 7 allowing the framework 5 to return to its normal position. Brake blocks 8a may be provided on the main frame a to coact with the roller 8 when the frame 5 is tilted and the balance of the frame 5 may be regulated by a weight 20 passing over a pulley 22. When the machine is out of action the framework 40 carrying the feedrollers 43 may be rocked about the shaft 37 and held with the rollers elevated by engagement of the shaft 42 with a lever 54.