Patent GB-191306810-A (GB)
Title: A Machine for Studding Tyre Treads.
IPC: B29D30/66
Filed: 1913-03-19
Granted: 1914-05-19
Abstract: 6810. Dunlop Rubber Co., Snodgrass, D. G., and Turpin, W. A. March 19. Tyres, elastic, special apparatus for making. -Relates to a machine for automatically applying and securing studs to a tread. The machine is shown in plan in Fig. 2. The tyre tread is mounted on an annular mandrel a, having circumferential rows of holes in staggered relation, which is rotated by means of a ratchet-wheel h and a cam-actuated pawl i to bring the holes successively into register with a punching-device b and devices d for applying studs and washers. The mandrel is locked in position during the operation of the devices by one of two plungers j, j* engaging in holes in the wheel h. The mandrel can be laterally adjusted by a handwheel a<9>, and the pawl longitudinally adjusted in a carrier i<4> by a cam, while one or other of the plungers j, j*, which are actuated by springs and cams j<2>, can be put out of action, according to the row of holes desired to be in register with the punching and stud-applying devices. The punching-device, Fig. 4, comprises a punch b and a die c which are caused to approach and recede from one another through the holes in the mandrel by levers b<3>, c<3> actuated by eccentrics b<1>, c<1> on the power shaft f; in order that the tyre. tread may not be pulled away from the mandrel, it is pressed thereon by a cam-actuated lever w on the return motion of the punch. The stud-applying device consists of a plunger d, Fig. 2, which is actuated from the shaft f by a lever d<3> and eccentric d<1> to force the stems of studs, fed to the correct position, through the hole punched in the tread. A device for applying washers to, and burring the stems of, the studs is arranged opposite to the plunger d, Fig. 14, on the other side of the mandrel, and is actuated in a similar way. This device comprises a plunger e through a hole in which projects a yielding pin e<4> for centring the washers fed to it, the hole being too small to allow the stems of the studs to pass into it. The studs are fed to the plunger d from a hopper r, Fig. 22, by means of a slide r<1> with a grooved inclined top, which gathers studs as it is moved upwards by means of rollers r<4> on a chain-driven wheel r<5> engaging its base, and allows them to fall into a guide p when in its uppermost position, the slide remaining stationary long enough in this position owing to the form of its base. All studs which are not shank-uppermost or of the right shape are prevented from entering the guide by a wheel r<2>, while the guide is curved so that the studs are delivered head-uppermost between two spring-connected slides n, n<Î>, Figs. 12 and 14, caused to reciprocate by a link n<2> pivoted to the strap of the eccentric d'. The studs are prevented from falling from the slides by leaf springs n<4> until forced downwards by the plunger d when in register therewith. The slide n has a bevelled part n<6>, which ensures that only one stud shall be taken at a time from the guide p. The washers are fed from an inclined hopper s, Fig. 23, shaken, preferably, by a cam-wheel s<5>, from which they. pass through large holes in a partition s<1> and small holes in a partition s<2> into a bell-mouthed tube q, which is tapped bv hammers q<2> actuated by the camwheel s<5>. The washers are delivered bv the tube to a hole o<1> in a slide o, Fig. 14, of the same thickness, which is caused to reciprocate by an eccentric on the shaft f and carries them one at a time to register with the plunger e. The eccentrics actuating the punching-device and the device for applying studs and washers are coupled to the shaft through clutches so that one or both of the devices may be put out of operation. The clutch u, shown in Fig. 27, comprises a notched member sliding in a plate u<1> and normally engaging flats on a sleeve f<1> on the shaft, which can be moved out of engagement against springs u<3> by pressing the lever t on a projection u<6>.