748 



THE INDIA RUBBER WORLD 



July 1, 1921 



tained steam boiler, tube plate and inside patch vulcanizer attach- 

 ment. 



Another popular equipment is the improved Type E cavity re- 

 treading vulcanizer. This model will accommodate all makes of 

 tires from 3-inch to 5-inch cord and fabric tires. It is a self- 

 contained outfit. 



"IDEAL" TUMBLING BARRELS 



The promptness with which machines employed in other indus- 

 tries are adapted by rubber engineers for their special use is 

 characteristic of the industry. 



The cement mi.xer shown in the accompanying illustration is 

 offered as a suggestion having possibilities as a tumbler for small 



A Time-Saving Tumbling Barrel. 



molded nibbcr articles because of its automatic loading and 

 emptying features that save a great deal of labor. 



The machine may be loaded and unloaded while in motion, and 

 the time required for either of these operations is but a fraction 

 of the time required by the old customary form of tumbling 

 barrel.— Ideal Concrete Machinerj' Co., Cincinnati, Ohio. 



SIFTING REEL FOR DRY COMPOUNDING INGREDIENTS 



The practice of sifting compounding iugrcdients before adding 

 them to the rubber mixing requires an effective mechanism that 

 will not easily became deranged. 



A special centrifugal reel for removing mechanical impurities, 

 shown in the accompanying illustration, consists of a cylinder 



Centrifugal Sifting Reel 



covered with the proper mesh cloth revolving at a slow speed. 

 The material entering the machine is picked up by beaters at- 

 tached to spiders fastened to a higher speed shaft and thrown 

 against the screen cloth, which rejects the lumps and impurities, 

 leaving the sifted product free from the injurious material. The 

 cloth cylinder is provided with a revolving brush to keep the 

 meshes of the cloth from filling up. The product passing through 



the cloth drops onto zinc-covered cant l)oards and thence into 

 the conveyor at the bottom of the machine to be delivered to an 

 opening at one end of the box. 



-As it is necessary to maintain a steady, even stream of material 

 to the reel a feeder, not shown in the illustration, is employed 

 which can be regulated to deliver a uniform amount to the ma- 

 chine. 



These reels are in successful operation in several of the lead- 

 ing tire plants. — AUis-Chalmers Manufacturing Co., Milwaukee, 

 Wisconsin. 



MACHINERY PATENTS 



MACHINE FOR MAKING TIRE CASINGS 



THE apparatus shown in Fig. 1 is used for making the fabric 

 foundation of a tire casing. A fabric strip formed of parallel 

 rubber-coated cords, is wound obliquely about spaced wires A 

 mounted over pairs of grooved pulleys B. The strip is led from 

 a drum to reels C projecting from a frame, which embraces 

 the wires A. The frame itself is rotated by bevel gearing D. 

 It is rocked about its supporting shaft by a cam, having an 

 adjustable connecting rod. The wires A are advanced through 

 the frame by intermittent rotation of the pulley E. The pulley 

 is actuated by one-way clutch members, connected to a crank 

 disk. Between the advancing movements of the wires A the 

 superposed layers of fabric are consolidated between a hammer 

 F and an anvil impelled by tappet mechanism. The tension roller 

 C is arranged in the lower run of the wires and is mounted on 

 a block having an adjustable spring which fits between a fixed 

 bracket and a hand-wheel nn the stem of the block. 



Fig. 1. Tire Casing Machine — Fig. 2. Autom.\tic Enclosed 

 Mixer — Fig. 3. Solvent-Recovery Apparatus. 



A hand-operated ramp is used for lifting the tension roller out 

 of action, and for varying the spacing of the wires the pulleys B 

 are threaded on the bosses of the pulleys E. A spacing plate is 

 arranged between the wires. — British patent No. 150,717. — A. 

 Wolber, Levallois-Perret, Seine, France. 



AUTOMATIC MACHINE FOR MIXING RUBBER 



The mixer shown in Fig. 2 consists of a cylindrical casing con- 

 taining a rotary member A mounted in bearings and provided 

 with two or more helical blades of opposite twist, with gaps 

 left between the ends of the blades. Thus the material is forced 

 along towards the end of the chamber, then passes through a 

 gap and is forced by the other blade to the other end of the 

 chamber, and so on. Each of the blades has its edge beveled, 

 so that the mixture which is forced outwards by the surfaces of 

 the blades, is smeared against the inner surface of the chamber. 



The mixing chamber and the interior of the rotatable member 

 may be heated or cooled by steam or water supplied through 

 pipes. The door of the mixing chamber hinges at the bottom 



