Patent GB-665075-A (GB)
Title: Improvements relating to machines for use in building tires
IPC: B29D30/30
Filed: 1949-11-07
Abstract: 665,075. Tyre-building machines. AKRON STANDARD MOLD CO. Nov. 7, 1949, No. 28452/49. Class 144 (i). In a machine, for supplying stock to a tyrebuilding drum A, wherein two diametricallyopposed sets 30, 30a of stock-carrying rollers 40 are mounted on a pivoted turret 20 having a 180 degree movement for selective presentation of the stock carriers 30, 30a to the building drum A, one form of the invention comprises a tread strip storage conveyer arrangement 90, 91, 110 which is movable from a loading position at the side of the machine to a position below the turret for delivery of a tread strip B tangentially to the drum A. In a second form of the invention the turret is rotated by power-operated means providing for gradual initial acceleration and then gradual deceleration between its stationary positions. In further forms of the invention each stock carrier comprises a pair of downwardly-inclined angularlyadjustable arms pivoted to the turret or alternatively each comprises a rotary drum with the stock-carrying rolls arranged in a circular course about its horizontal axis. As shown in Figs. 1, 8 and 10 the turret 20 is a rectangular boxlike frame, the base of which is mounted on a vertical pivot 15 fixed to a cantilever 12 carried by a main support frame 10. The 180 degrees movement of the turret 20 about pivot 15 is effected by a motor 60 mounted on a carriage 62 slidable on guides 26 on the base of the turret frame, the motor being geared to a pinion 52 which engages a horizontal sinusoidal rack 50 secured to the cantilever 12. The shaft of the pinion 52 is extended to carry a roller 55 engaging in a sinusoidal slot which lies parallel with the rack 62 and is formed in a plate-member 16 therebelow. In operation, on rotation of the pinion 52 the turret rotates slowly at first, the carriage 62 being moved towards pivot 15, then accelerates as it reaches a 90 degree displacement and then decelerates to come to rest slowly on completion of its rotation, the carriage 62 sliding back away from the pivot. The two stock carriers 30, 30a, Figs. 1, 13, 14, each comprise a pair of adjustable downwardlyinclined arms 31 projecting from the turret 20 and each arm 31 carries at its ends a pair of pivoted sprockets 34, 35 supporting a chain 36 which is driven by an individual motor 70. The stock carrying rollers 40 are supported for rotation between the chains 36 and are interspaced with liner-carrying rollers 41, sag of the chains 36 being prevented by the roller shafts being extended beyond the chains to engage stationary inclined guides 44, 45. For loading, and delivery from, the rollers 40, the arms 31 have end extensions 80 supporting a motor 86 which drives, via a friction brake pulley 88, a friction roller 82 arranged to engage a circular head 47 at the end of each roller 40, the stock being led to or from the roller by way of an inclined table extension 81. After stock has been drawn from a roller 40 at the delivery position, the depending stock length is wound up by means of a pinion 48 which is carried by the roller 40 and, as the chains 36 move to bring succeeding rollers to the delivery position, engages a rack 49 fixed on the lower guide member 45. The tread strip conveyer (Figs. 1, 4, 5, 6) comprises two parallel sets of conveyer rollers 95 carried by a frame 92, 93 which is pivoted at 96 on a carriage 90 slidable on guide 91 extending beyond one side of the main supporting frame 10, the latter being open at this side to allow such lateral movement and the conveyer being adjustable about pivot 96 for tangential presentation to varying sizes of tyre building drum. The storage member of the conveyer comprises a drum 110 rotatably mounted on arms 120 rigid with the carriage 90 and rotated by a motor-driven spring-urged friction roller 130 arranged within the drum. A strap 112 has one end fixed to the drum surface and the other end attached to a spring-loaded roller 113 supported by the conveyer above the drum so that the strap is maintained under tension. For loading, the conveyer is moved to the side of the machine and a tread strip B is placed on the conveyer rollers so that one end passes into the pocket formed between the strap 112 and the drum 110 and the latter is then rotated to the position shown in Fig. 1 so that the other end of the strip rests on the free end of the conveyer. The conveyer is then moved on the guides 91 to the discharge position below the turret and the drum 110 is rotated in the opposite direction to that previously to deliver the strip B on to the tyre building drum A, the strap 112 being wound up on the roller 113. The lateral movement of the conveyer and storage drum is effected by a double-acting piston 141, the rod 142 of which is secured at its end at 143 to the main supporting frame. The piston operates within a cylinder 140 rigidly mounted on the conveyer and having pressure air supply conduits 148, 149, respectively, at its ends 146, 147. In an alternative arrangement shown in Fig. 21, the storage drum is dispensed with and an endless belt 190 is arranged to pass over conveyer rollers 195 and loop over the two end rollers, the rear one 203 of which is motordriven so that loading and discharging is facilitated. An alternative arrangement of the turret and diametrically-opposed stock carriers is shown in Figs. 17 and 18 wherein the carriers each comprise a drum formed by two circular end-plates 150, or 150a, mounted on a shaft 152, the two shafts being journalled between spaced vertical side-plates 175 secured to the opposite ends of a turret frame 176. Stock rollers 160 are mounted around the periphery of the drums and liner rollers 165 associated therewith are arranged in two concentric courses radially inwards of the stock rollers. The turret swinging mechanism is as described with reference to Figs. 8 and 10 and the rotation of each carrier drum is effected through worm gearing by a motor 170 on the turret frame. Each stock-carrying roller and its associated liner roller carry an end pulley, the liner roller pulley being spring-loaded and the pulleys being interconnected by a strap so that the liner material is unwound or wound up on its roller automatically on loading or discharging from the stock roller. To rewind the length of stock depending from a roller after it has passed the delivery position, an arcuate friction track 180 is arranged on the turret frame to engage a pulley on the stock roller as the carried drum is rotated.