April 1, 1915.] 



THE INDIA RUBBER WORLD 



389 



a 



the other. This roll revolves at a higher rale of speed and 

 insures the close winding up of the rolls, thereb) producing firm, 

 compact coils without stretching the weh. [Cameron Machine 

 Co., Brooklyn, New York.] 



LARGE CALENDERS BEING MADE IN ENGLAND. 



HTML February number of tlii - journal described and illus- 

 ' trated a large three-roll calender being made in an Amer- 

 ican foundry. David Bridge & Co., Limited, of Manchester, 

 i : land, are also making some calenders of unusual size. The 

 accompanying cut shows a photograph of a three-roll calender 

 now being constructed in their works. This machine has rolls 

 28 inches in diameter by 84 inches wide, and two 

 of gearing for the following speeds: All three rolls even; top 

 roll friction, two 

 bottom rolls 

 even ; bottom 

 roll friction, two 

 top rolls even ; 

 and friction both 

 top and bottom. 

 The changing 

 over from one 

 speed to another 

 is done by double 

 c 1 a w clutches, 

 and this can be 

 effei ted in a few 

 minutes An im- 

 proved adjust- 

 ment enables one 

 or both sides of 

 the top and bot- 

 tom rolls to be 

 adjusted simul- 

 taneously or in- 

 dependently. The 

 motor shown in 

 the photograph 

 was arranged for 

 temporary pur- 

 poses and does 

 not represent the 

 motor by which 

 the calender will 

 be driven. 



Large 3-Roll Calender Being Constructed By David Bridge & * o. 



OTHER DEVICES. 



Latex I oagi i vting M \e. — The latex is fed from a tank 



to an endless belt. This is guided by a series of rollers and 

 passes from the bottom to the top of a chamber through which 

 smoke is drawn by a fan. It then passes in a similar manner 

 through a steam-heated drying room in which hot air is circu- 

 lated. Stripping rollers remove the surplus latex from the belt. 

 Alter passing through the drying room the coagulated and dried 

 rubber is removed from the belt. (British patent No. 16,372.] 



I i l' i I hie. — The novel features of this device are the 

 three mandrels, A cutter bar in which are fastened three knives 

 is supported over the mandrels, by a back shaft pivoted in the end 

 frames. I his bar is raised and lowered by cam levers which 

 bring the knives in contact with the rubber-covered revolving 

 mandrels. The thickness of the jar rings is regulated by the 

 feed of a head screw that controls the longitudinal movement of 

 the cutter bar. [German patent G. M. \ T o. 619,093] 



Tubular Fabric Loom. — Chernak's invention relates to the 

 type of loom having a series of shuttles propelled in a circular 

 path and slides reciprocated by cam grooves. The number of 

 warp threads can be materially increased without increasing the 

 diameter of the machine, and the shed forming portions of the 

 warp .oe given the proper tension. Fastened to the base of the 

 machine is a hollow spindle through which a cable or other core 

 to be covered is fed. In the manufacture of tubular fabric with- 

 out a core the upper end of the spindle supports a mandrel about 

 which the fabric is w ovi n 



The cam ring is mounted on the hollow spindle and is driven 

 evel gears. On the outer surface of the ring are cam 

 grooves which reciprocate the shuttle-propelling slides. These 

 reciprocate vertically the harness slides that carry the warp 

 threads. The slides are thin elongated plates, having longitu- 

 dinal openings in which wire heddles with warp thread eyes are 

 located. The lower ends of the heddles are secured to fixed pins 

 and their upper ends to vertically adjustable pins carried by 

 slides which are also adjustable by screw threaded stems and 

 nuts to maintain tension on the heddles. The harness slides are 



reciprocated and 

 moved simulta- 

 neously in oppo- 

 site directions by 

 the cam grooves, 

 and the warp 

 threads are 

 caused to form 

 sheds through 

 which the shut- 

 tles pass. Each 

 harness slide may 

 be provided with 

 any desired num- 

 ber of heddles, 

 and this permits 

 the use of a 

 much larger 

 number of warp 

 threads in pro- 

 portion to the 

 diameter of the 

 machine frame 

 than would be 

 possible if the 

 warp threads 

 were carried by 

 the shuttle oper- 

 ating slides. 

 [United States 

 patent No. 1,129,- 

 642.] 



