Patent GB-851547-A (GB)
Title: Tyre bands applying apparatus
IPC: B29D30/30
Filed: 1958-01-14
Abstract: 851,547. Building tyres. YOKOHAMA RUBBER CO. Ltd. Jan. 14, 1958 [Jan. 17, 1957], No. 1335/58. Class 144 (1). An apparatus for applying tyre ply bands 69 to a tyre building drum 64 comprises an arm 12 pivoted at one end on a fixed vertical support shaft 26 on the building machine, a frame 29 movable about a horizontal pivot 30 at the other end of the arm 12 and carrying a band applying and tensioning roller 49, and a mechanism operative, on movement of the arm 12 to swing the roller 49 from a band applying position, Figs. 1 and 2, parallel to the drum axis, to a band loading position angularly disposed thereto, to adjust the frame 29 about its pivot 30 to move the roller 49 radially away from the drum axis by an amount equal to the ply thickness of the band previously applied. As shown the shaft 26 upstands from a pedestal 10 and the arm 12 supports spaced bearings 13, 14 journalling a rod 15 on which the pivot 30 is carried. The bearings 13, 14 support pivoted yoke-ended links 21, 22 which in turn support a rod 23 transversely pinned between each yoke-ends 17, 19. The rod 23 supports a cam roller 24 in contact with a cam 25 fixed on the shaft 26 and the link 22 supports an adjustable stop screw 45 in contact with a stepped cam 32 rotatably mounted on a horizontal shaft 34 on the frame 29. The stepped cam 32 is fixed to a correspondingly toothed ratchet 33 which is engaged by a pawl 36 pivoted on one end of a lever 35, the latter being pivoted intermediate its ends on the shaft 34 and being linked at its other end to one end 38 a rod 37. The other end of the rod 37 is pivoted to one end of a rocking lever 41 pivotally mounted on the hub 11 of arm 12 and carrying a cam roller 42 in contact with a cam 27 fixed on the shaft 26. The ratchet 33 is spring-loaded by a spring 48 acting between the frame 29 and a lever 47 fixed to the shaft 34, and the frame 29 is biased by a spring 31 acting between the arm 12 and the lower end of the frame 29. The band applying roller 49 is detachably mounted horizontally in aligned bearings 53, 54 in a cross member 52 bolted to the head 50 of the frame 29, the bearing 54 comprising a pivoted half-bearing for release of the roller 49. In operation, with the arm 12 extending as in Figs. 1 and 2 at right angles to the drum axis and the roller 49 thereby in its band applying position parallel to the drum axis, a band 69 having been applied the roller 49 is disengaged from the band 69 and its support 52. The arm 12 is then swung anti-clockwise towards a band-loading position whereupon the cam roller 42 moves from the position shown in Fig. 3 to ride up on the cam peak 66, Fig. 4, to effect retraction of the rod 37 and thereby rotate the ratchet 33 by the pawl 36. The stepped cam 32 is thus rotated so that the next higher step 67 thereof is brought opposite the stop 45. This constrains the roller 49 to move radially further from the drum axis when, after loading a fresh band on the roller 49, the arm 12 is swung clockwise back to the band applying position. Towards the end of this latter movement the cam roller 24 on the rod 23 rides on to a flat 65, Fig. 2, of the otherwise circular cam 25, whereupon the consequential motion of the roller 49 is accordingly more linear.