| 摘要 |
<p>997,532. Applying material to tyres. FIRESTONE TIRE & RUBBER CO. Aug. 21, 1963 [Sept. 18, 1962], No. 33069/63. Heading B7C. A calender 40 (Fig. 2) produces a sheet of unvulcanized rubber from which a strip S is segregated by trimming means 44, the strip being applied by roll means 55 to a tyre carcase on a rotatable mandrel 30 and cut off by means 50 after the proper length has been applied. Fig. 1 shows a rotatable turret table 12, which carries a series of expandable mandrels 30, and is indexed by a cylinder 20 (Fig. 3, not shown) to bring each mandrel in turn opposite Stations 1 . . . 5. At Station 1 a carcase is loaded on to a mandrel 30 and at Stations 2 . . . 4 apparatus as in Fig. 2 delivers and applies sidewalls and tread layers to the carcase. The arrangement (Fig. 4, not shown) is applicable to manufacture or retreading of tyres. When a mandrel is lowered to contact roll 55 (Fig. 2) a gripper head 62 grips the strip by vacuum means and applies it to roll 55 for pressing on to the carcase. Spaced trimming knives 45 segregate a strip or strips (e.g. shoulder strips) of the right width and in the correct positions axially of the carcase. More than one turn of strip may be applied and the knives 45 may move to cut for example tapering strips for tread shoulders (Fig. 4, not shown). Roll knife 50 then cuts the strip(s), and the carcase is lifted by cylinder 35 and moved round to the next station. At Station 5 mandrels are collapsed and raw tyres removed for moulding. The different calendars may produce different grades of rubber appropriate to the different parts of the tyre. The rolls 41, 42 may be relatively adjustable.</p> |
