Patent GB-191505932-A (GB)
Title: Improvements in and relating to Tire-making Machines.
IPC: B29D30/14
Filed: 1915-04-20
Abstract: 5932. Goodyear Tire and Rubber Co., [Assignees of Covery, J. J.]. Aug. 10, 1914, [Convention date]. Tyres, elastic, special apparatus for making.- Relates to tyre-forming machines of the type in which the rubber-impregnated fabric forming the lining of the beaded tyre cover is pressed on to a rotary core by rollers, Figs. 2 and 5 being partial front elevation and plan of such a machine. In operation of the machine, before the tyre beads have been placed in position, fabric from a stockroller (not shown) is stretched round the core 22 while it is being rotated at slow speed by the driving-mechanism, after which the clutch 30 is moved to give a higher speed. The handle 93 is then operated to turn the shaft 92, Fig. 7, which opens a valve to permit fluid under pressure to enter the cylinders 80 and so to force the rollers 74 outwards towards the core. The control lever 63, Figs. 5 and 7, is then operated, whereby the slotted parts 61 of the lever move the two halves of the clamping-nut 59, Fig. 10, into gear with the feed-screw 40, so that as it is rotated by the driving- mechanism, the clamping-nut and the carriage 35 are moved forwards to bring the rollers 74 into contact with the core and to hold them in contact until the whole of the fabric has been pressed. The forward movement continues until the stopnut 112 on the carriage engages the projection 110 on the arm 104, whereupon the arm is pressed forwards to rock the shaft 92 so as to stop the flow of fluid to the cylinders 80 and to exhaust them into the atmosphere, thus permitting the springs 86 to withdraw the rollers out of contact with the core. The abutment 65 on the control lever 63 next engages the stop-arm 69, which has previously been placed in the position shown in Fig. 10, to effect disengagement of the clamping-nut from the feed-screw, so that the carriage stops and, by means of the weights 54, is returned.to its initial normal position in contact with the adjustable buffer 73. Each of the cylinders 80 is mounted on a bracket 113 provided with a pivot-stud 114 adapted to turn in a cross-head 115, which is slidably mounted in guides 117 in the brackets 37. Each pivot stud carries a toothed wheel 118 which meshes with a rack 119, so that, when the cross-head 115 slides in the guides 117, the toothed wheel 118 and the bracket 113 are turned to change the angle of the roller 74 relatively to the core. The cross-heads are actuated through the mechanisms 120, 122, shaft 123, arms 148, and rollers 149 movable in camways 150 formed between the blocks 132 and the lever 130 pivoted to the bracket 131, this lever being held in the position shown in Fig. 4 by the engagement of the hooks 139, 140. During the forward movement of the carriage, the motion of the rollers 149 in the camways 150 turns the shaft 123 and so changes the angle of the rollers 74 relatively to the core. After the required layers of fabric have been pressed on to the core, the beads B are placed in position, and the bead rollers 159 are elevated by pressing the pedal 171, so that they engage the beads and press them on to the fabric as the core rotates. Another strip of fabric is then stretched round the core and over the beads, the adjusting-lever 68 being first operated so as to turn the shaft 67 aud the parts carried by it from the positions shown in Fig. 10 to those shown in Figs. 4 and 7. This permits the carriage, in its next forward movement, to take a longer stroke, the stop-nut 111 and the stop-arm 71, instead of the stop-nut 112 and the stop-arm 69, being now used to stop the motion. Turning the shaft 67 also releases the hook 140 on the lever 142 from the hook 139, so that as the carriage moves forwards, the rollers 149 are constrained to move first under the raised lever 130 and then down the arm 151 of the lever 142, whereby the shaft 123 is turned to change the angle of the rollers 74 relatively to the core so as to permit the fabric to be pressed over the beads. After the required layers of fabric have been pressed on, the beadrolling devices are elevated with the rollers 159 displaced away from the core and with the knifeholders 185 and cutters in position to trim the edges of the cover as the core is rotated to complete the cover. The two halves of the clamping- nut 59 cannot be engaged with the feed-screw 40 until a projecting piece has been moved by the operation of the fluid-pressure handle 93. By operating the spindle 125, the brackets 36 and rollers 74 may be adjusted transversely. The bracket 31 may be adjusted relatively to the core by means of a graduated plate 188. In modifications, the weights 54 are replaced by springs ; the cylinders 80 are double-acting; the fluid-pressure valve is opened mechanically; the precise path traversed by the rollers 74 in successive patbs is varied : and the reversing-gear is replaced by that shown in Fig. 30. In this modified reversing-gear, the operator, when starting the carriage for its advance, moves the arm 202 longitudinally, which actuates the shifter 200 to engage the gear 146 with the gear 45. At the end of the advance, the carriage engages an extension 200<a> on the shifter, which is thereby swung on its fulcrum 201 to disengage the gear 46 from the gear 45 aud to disengage the bell-crank lever 205 from the stud 209. This action allows the spring 213 to move the gear 195 into mesh with the gear 45, which returns the carriage to its original position. The Specification as open to inspection under Section 91 (3) (a) comprises also a tyre-forming machine in which the core having the fabric stretched round it moves towards and away from a fixed structure on which are mounted the adjustable fabric-pressing rollers ; this subject-matter does not appear in the Specification as accepted.