142 



THE INDIA RUBBER WORLD 



[December 1, 1916. 



New Machines and Appliances. 



SINGLE STBAND TESTING MACHINES. 



IT is very important to know the strength of individual strands 

 that make up the fabric used in tire building. To meet 

 this requirement the single strand testing machines shown 

 here have been designed. They are constructed on the dead 

 weight principle, without springs or delicate parts requiring at- 

 tention. The one on the left is operated by hand, and is baiit 

 with 10-pound capacity by ounces, and 20-pound capacity by % 

 pounds. The intermediate one operates by weights, and has a 

 10-pound capacity by ounces. A motor-driven tester of 10, 20 

 or 50-pound capacity is shown on the right. 

 ' In each machine the drive is made by a non-revolving screw, 

 operated by two spiral-cut gears held in a solid cast-iron housing 

 and packed in grease. The recording head is built as a balance 

 wheel, rotating upon two large, self-alining ball bearings, and is 

 extremely sensitive. There are no gears or other moving parts 

 to interpose friction, and the pointer is attached directly to the 



Hand Power. 



Plunger Rele.xse. 



Motor Drive. 



balance wheel, mdicating the breaking strain on a metal dial- 

 segment. The pointer is held in the exact position of the break 

 by a roll clutch, which prevents backlash, and is released and 

 reset by a small hand lever. 



The clamps automatically hold the end of the linest yarns. The 

 yarn is then passed over the eccentric, thereby obtaining addi- 

 tional clamping power and giving the tests all the advantage 

 of the spool form without tying. Standard machines are ar- 

 ranged with a distance of 12 inches between spool centers. Loop 

 tests are easily made with this equipment. A novel and easily 

 read compensating stretch device is included on each machine, 

 giving the net stretch at a glance. [Henry L. Scott & Co., Provi- 

 dence, Rhode Ishnd.] 



"HURRICANE" FIKEPROOF AUTOMATIC DRYERS. 



The vast quantity of plantation rubber now being produced 

 in the Far East must perforce be dried before it is packed 

 and shipped to the markets of the world. The problem of 

 drying 108,000 tons, last year's production, must have in- 

 volved much time, labor and incurred considerable cost to 

 the producers. The automatic drying machine here illustrated 



is successfully used for drying a variety of wet materials ana- 

 logous to crude rubber and therefore presents a suggestion 

 worthy of consideration. 



The machine is divided into sections and the heat is so 

 regulated that the material tinally emerges in a cool, dry 

 condition. The dryer is divided longitudinally into two com- 



partments, one containing the heating coils and the other 

 the endless chain conveyor that carries the material through 

 tlie machine. Located in the upper part are the fans pro- 

 ducing the recirculation of the air. 



The drying is accomplished in accordance with the well- 

 known counter-flow principle. The material is slowly carried 

 through the dryer by the conveyor. The general movement 

 of the drying air is directly opposite to this, as the fresh dry 

 air is admitted near the delivery end of the machine. The 

 air is constantly recirculated by the fans, alternately through 

 the material and steam coils, and progresses in a spiral man- 

 ner through the machine. During this process, the tem- 

 perature of the air is gradually raised and its capacity for 

 taking up moisture is thereby increased. 



Thus the material as it enters the dryer in a cold, wet 

 condition is subjected to the greatest amount of heat, and 

 the greatest amount of evaporation is accomplished. The 

 rapid evaporation of moisture tends' to prevent the absorption 

 of an undue amount of heat, so that no injury to the material 

 can result at this stage. As it becomes drier and passes 

 further through the machine, it encounters less and less heat, 

 and is subjected to cooler and drier air. Near the end of the 

 operation it comes in contact with fresh, cool, dry air, so that 

 the final moisture is readily removed and the material deliv- 

 ered dry and cool. [The Philadelphia Drying Machinery Co., 

 Philadelphia, Pennsylvania.] 



the EASTMAN ELECTRIC CLOTH CUTTER. 



Motor-driven cloth cutting machines are labor saving devices 

 that could hardly be dispensed with by manufacturers of rub- 

 ber clothing and other apparel of a like nature. That these 



machines have a wider field of use- 

 fulness is shown by the increasing 

 call for motor-driven cloth cutters 

 from manufacturers of gaskets and 

 automobile tires. 



The machine shown in the first 

 illustration is of the reciprocating 

 knife type and built to operate on 

 110 or 220-volt direct or alternating 

 current. It is equipped with a pow- 

 erful motor and all bearings are a 

 combination ball and roller bearing 

 type which divides the wearing strain 

 over a large surface and reduces 

 wear and tear to the minimum. 



